Merge "Upgrade to latest dlmalloc. Refactor Heap and related APIs to use STL like naming." into dalvik-dev
diff --git a/build/Android.common.mk b/build/Android.common.mk
index ed2229f..ba34206 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -126,6 +126,7 @@
src/dex_file_verifier.cc \
src/dex_instruction.cc \
src/dex_verifier.cc \
+ src/dlmalloc.c \
src/file.cc \
src/file_linux.cc \
src/heap.cc \
@@ -168,7 +169,6 @@
src/mem_map.cc \
src/memory_region.cc \
src/monitor.cc \
- src/mspace.c \
src/mutex.cc \
src/oat.cc \
src/oat_file.cc \
diff --git a/src/card_table.cc b/src/card_table.cc
index 0871ed9..386b27c 100644
--- a/src/card_table.cc
+++ b/src/card_table.cc
@@ -43,76 +43,73 @@
* rather strange value. In order to keep the JIT from having to
* fabricate or load GC_DIRTY_CARD to store into the card table,
* biased base is within the mmap allocation at a point where its low
- * byte is equal to GC_DIRTY_CARD. See CardTable::Init for details.
+ * byte is equal to GC_DIRTY_CARD. See CardTable::Create for details.
*/
-CardTable* CardTable::Create(const byte* heap_base, size_t heap_max_size, size_t growth_size) {
- CardTable* bitmap = new CardTable;
- bitmap->Init(heap_base, heap_max_size, growth_size);
- return bitmap;
-}
-
-/*
- * Initializes the card table; must be called before any other
- * CardTable functions.
- */
-void CardTable::Init(const byte* heap_base, size_t heap_max_size, size_t growth_size) {
+CardTable* CardTable::Create(const byte* heap_begin, size_t heap_capacity) {
/* Set up the card table */
- size_t length = heap_max_size / GC_CARD_SIZE;
+ size_t capacity = heap_capacity / GC_CARD_SIZE;
/* Allocate an extra 256 bytes to allow fixed low-byte of base */
- mem_map_.reset(MemMap::MapAnonymous("dalvik-card-table", NULL, length + 256, PROT_READ | PROT_WRITE));
- if (mem_map_.get() == NULL) {
+ UniquePtr<MemMap> mem_map(MemMap::MapAnonymous("dalvik-card-table", NULL,
+ capacity + 256, PROT_READ | PROT_WRITE));
+ if (mem_map.get() == NULL) {
std::string maps;
ReadFileToString("/proc/self/maps", &maps);
LOG(FATAL) << "couldn't allocate card table\n" << maps;
}
- byte* alloc_base = mem_map_->GetAddress();
- CHECK(alloc_base != NULL);
- base_ = alloc_base;
- length_ = growth_size / GC_CARD_SIZE;
- max_length_ = length;
- offset_ = 0;
- /* All zeros is the correct initial value; all clean. */
+ // All zeros is the correct initial value; all clean. Anonymous mmaps are initialized to zero, we
+ // don't clear the card table to avoid unnecessary pages being allocated
CHECK_EQ(GC_CARD_CLEAN, 0);
- biased_base_ = (byte *)((uintptr_t)alloc_base -((uintptr_t)heap_base >> GC_CARD_SHIFT));
- if (((uintptr_t)biased_base_ & 0xff) != GC_CARD_DIRTY) {
- int offset = GC_CARD_DIRTY - (reinterpret_cast<int>(biased_base_) & 0xff);
- offset_ = offset + (offset < 0 ? 0x100 : 0);
- biased_base_ += offset_;
+
+ byte* cardtable_begin = mem_map->Begin();
+ CHECK(cardtable_begin != NULL);
+
+ // We allocated up to a bytes worth of extra space to allow biased_begin's byte value to equal
+ // GC_CARD_DIRTY, compute a offset value to make this the case
+ size_t offset = 0;
+ byte* biased_begin = (byte *)((uintptr_t)cardtable_begin -((uintptr_t)heap_begin >> GC_CARD_SHIFT));
+ if (((uintptr_t)biased_begin & 0xff) != GC_CARD_DIRTY) {
+ int delta = GC_CARD_DIRTY - (reinterpret_cast<int>(biased_begin) & 0xff);
+ offset = delta + (delta < 0 ? 0x100 : 0);
+ biased_begin += offset;
}
- CHECK_EQ(reinterpret_cast<int>(biased_base_) & 0xff, GC_CARD_DIRTY);
- ClearCardTable();
+ CHECK_EQ(reinterpret_cast<int>(biased_begin) & 0xff, GC_CARD_DIRTY);
+
+ return new CardTable(mem_map.release(), biased_begin, offset);
}
void CardTable::ClearCardTable() {
- CHECK(mem_map_->GetAddress() != NULL);
- memset(mem_map_->GetAddress(), GC_CARD_CLEAN, length_);
+ // TODO: clear just the range of the table that has been modified
+ memset(mem_map_->Begin(), GC_CARD_CLEAN, mem_map_->Size());
}
-/*
- * Returns the first address in the heap which maps to this card.
- */
-void* CardTable::AddrFromCard(const byte *cardAddr) const {
- CHECK(IsValidCard(cardAddr));
- uintptr_t offset = cardAddr - biased_base_;
- return (void *)(offset << GC_CARD_SHIFT);
+void CardTable::CheckAddrIsInCardTable(const byte* addr) const {
+ byte* cardAddr = biased_begin_ + ((uintptr_t)addr >> GC_CARD_SHIFT);
+ if (!IsValidCard(cardAddr)) {
+ byte* begin = mem_map_->Begin() + offset_;
+ byte* end = mem_map_->End();
+ LOG(FATAL) << "Cardtable - begin: " << reinterpret_cast<void*>(begin)
+ << " end: " << reinterpret_cast<void*>(end)
+ << " addr: " << reinterpret_cast<const void*>(addr)
+ << " cardAddr: " << reinterpret_cast<void*>(cardAddr);
+ }
}
-void CardTable::Scan(byte* base, byte* limit, Callback* visitor, void* arg) const {
- byte* cur = CardFromAddr(base);
- byte* end = CardFromAddr(limit);
- while (cur < end) {
- while (cur < end && *cur == GC_CARD_CLEAN) {
- cur++;
+void CardTable::Scan(byte* heap_begin, byte* heap_end, Callback* visitor, void* arg) const {
+ byte* card_cur = CardFromAddr(heap_begin);
+ byte* card_end = CardFromAddr(heap_end);
+ while (card_cur < card_end) {
+ while (card_cur < card_end && *card_cur == GC_CARD_CLEAN) {
+ card_cur++;
}
- byte* run_start = cur;
+ byte* run_start = card_cur;
size_t run = 0;
- while (cur < end && *cur == GC_CARD_DIRTY) {
+ while (card_cur < card_end && *card_cur == GC_CARD_DIRTY) {
run++;
- cur++;
+ card_cur++;
}
if (run > 0) {
- byte* run_end = &cur[run];
+ byte* run_end = &card_cur[run];
Heap::GetLiveBits()->VisitRange(reinterpret_cast<uintptr_t>(AddrFromCard(run_start)),
reinterpret_cast<uintptr_t>(AddrFromCard(run_end)),
visitor, arg);
@@ -120,9 +117,6 @@
}
}
-/*
- * Verifies that gray objects are on a dirty card.
- */
void CardTable::VerifyCardTable() {
UNIMPLEMENTED(WARNING) << "Card table verification";
}
diff --git a/src/card_table.h b/src/card_table.h
index 1f58507..804e97b 100644
--- a/src/card_table.h
+++ b/src/card_table.h
@@ -25,84 +25,75 @@
class CardTable {
public:
- typedef void Callback(Object* obj, void* arg);
- static CardTable* Create(const byte* heap_base, size_t heap_max_size, size_t growth_size);
+ static CardTable* Create(const byte* heap_begin, size_t heap_capacity);
- /*
- * Set the card associated with the given address to GC_CARD_DIRTY.
- */
+ // Set the card associated with the given address to GC_CARD_DIRTY.
void MarkCard(const void *addr) {
byte* cardAddr = CardFromAddr(addr);
*cardAddr = GC_CARD_DIRTY;
}
- byte* GetBiasedBase() {
- return biased_base_;
- }
-
- void Scan(byte* base, byte* limit, Callback* visitor, void* arg) const;
-
+ // Is the object on a dirty card?
bool IsDirty(const Object* obj) const {
return *CardFromAddr(obj) == GC_CARD_DIRTY;
}
- void ClearGrowthLimit() {
- CHECK_GE(max_length_, length_);
- length_ = max_length_;
+ // Returns a value that when added to a heap address >> GC_CARD_SHIFT will address the appropriate
+ // card table byte. For convenience this value is cached in every Thread
+ byte* GetBiasedBegin() const {
+ return biased_begin_;
}
+ // For every dirty card between begin and end invoke the visitor with the specified argument
+ typedef void Callback(Object* obj, void* arg);
+ void Scan(byte* begin, byte* end, Callback* visitor, void* arg) const;
+
+
+ // Assertion used to check the given address is covered by the card table
+ void CheckAddrIsInCardTable(const byte* addr) const;
+
private:
- CardTable() {}
+ CardTable(MemMap* begin, byte* biased_begin, size_t offset) :
+ mem_map_(begin), biased_begin_(biased_begin), offset_(offset) {}
- /*
- * Initializes the card table; must be called before any other
- * CardTable functions.
- */
- void Init(const byte* heap_base, size_t heap_max_size, size_t growth_size);
-
- /*
- * Resets all of the bytes in the card table to clean.
- */
+ // Resets all of the bytes in the card table to clean.
void ClearCardTable();
- /*
- * Returns the address of the relevant byte in the card table, given
- * an address on the heap.
- */
+ // Returns the address of the relevant byte in the card table, given an address on the heap.
byte* CardFromAddr(const void *addr) const {
- byte *cardAddr = biased_base_ + ((uintptr_t)addr >> GC_CARD_SHIFT);
- CHECK(IsValidCard(cardAddr));
+ byte *cardAddr = biased_begin_ + ((uintptr_t)addr >> GC_CARD_SHIFT);
+ // Sanity check the caller was asking for address covered by the card table
+ DCHECK(IsValidCard(cardAddr)) << "addr: " << addr
+ << " cardAddr: " << reinterpret_cast<void*>(cardAddr);
return cardAddr;
}
- /*
- * Returns the first address in the heap which maps to this card.
- */
- void* AddrFromCard(const byte *card) const;
+ // Returns the first address in the heap which maps to this card.
+ void* AddrFromCard(const byte *cardAddr) const {
+ DCHECK(IsValidCard(cardAddr));
+ uintptr_t offset = cardAddr - biased_begin_;
+ return (void *)(offset << GC_CARD_SHIFT);
+ }
- /*
- * Returns true iff the address is within the bounds of the card table.
- */
+ // Returns true iff the card table address is within the bounds of the card table.
bool IsValidCard(const byte* cardAddr) const {
- byte* begin = mem_map_->GetAddress() + offset_;
- byte* end = &begin[length_];
+ byte* begin = mem_map_->Begin() + offset_;
+ byte* end = mem_map_->End();
return cardAddr >= begin && cardAddr < end;
}
- /*
- * Verifies that all gray objects are on a dirty card.
- */
+ // Verifies that all gray objects are on a dirty card.
void VerifyCardTable();
-
+ // Mmapped pages for the card table
UniquePtr<MemMap> mem_map_;
- byte* base_;
- byte* biased_base_;
- size_t length_;
- size_t max_length_;
- size_t offset_;
+ // Value used to compute card table addresses from object addresses, see GetBiasedBegin
+ byte* const biased_begin_;
+ // Card table doesn't begin at the beginning of the mem_map_, instead it is displaced by offset
+ // to allow the byte value of biased_begin_ to equal GC_CARD_DIRTY
+ const size_t offset_;
};
} // namespace art
diff --git a/src/class_linker.cc b/src/class_linker.cc
index 5033c24..e0bcd04 100644
--- a/src/class_linker.cc
+++ b/src/class_linker.cc
@@ -558,7 +558,7 @@
const char* class_path = Runtime::Current()->GetClassPath().c_str();
std::string boot_image_option_string("--boot-image=");
- boot_image_option_string += Heap::GetSpaces()[0]->GetImageFilename();
+ boot_image_option_string += Heap::GetSpaces()[0]->AsImageSpace()->GetImageFilename();
const char* boot_image_option = boot_image_option_string.c_str();
std::string dex_file_option_string("--dex-file=");
@@ -630,10 +630,9 @@
oat_files_.push_back(&oat_file);
}
-OatFile* ClassLinker::OpenOat(const Space* space) {
+OatFile* ClassLinker::OpenOat(const ImageSpace* space) {
MutexLock mu(dex_lock_);
const Runtime* runtime = Runtime::Current();
- VLOG(startup) << "ClassLinker::OpenOat entering";
const ImageHeader& image_header = space->GetImageHeader();
// Grab location but don't use Object::AsString as we haven't yet initialized the roots to
// check the down cast
@@ -641,7 +640,8 @@
std::string oat_filename;
oat_filename += runtime->GetHostPrefix();
oat_filename += oat_location->ToModifiedUtf8();
- OatFile* oat_file = OatFile::Open(oat_filename, "", image_header.GetOatBaseAddr());
+ OatFile* oat_file = OatFile::Open(oat_filename, "", image_header.GetOatBegin());
+ VLOG(startup) << "ClassLinker::OpenOat entering oat_filename=" << oat_filename;
if (oat_file == NULL) {
LOG(ERROR) << "Failed to open oat file " << oat_filename << " referenced from image.";
return NULL;
@@ -832,8 +832,8 @@
const std::vector<Space*>& spaces = Heap::GetSpaces();
for (size_t i = 0; i < spaces.size(); i++) {
- Space* space = spaces[i];
- if (space->IsImageSpace()) {
+ if (spaces[i]->IsImageSpace()) {
+ ImageSpace* space = spaces[i]->AsImageSpace();
OatFile* oat_file = OpenOat(space);
CHECK(oat_file != NULL) << "Failed to open oat file for image";
Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches);
@@ -842,7 +842,7 @@
if (i == 0) {
// Special case of setting up the String class early so that we can test arbitrary objects
// as being Strings or not
- Class* java_lang_String = spaces[0]->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)
+ Class* java_lang_String = space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)
->AsObjectArray<Class>()->Get(kJavaLangString);
String::SetClass(java_lang_String);
}
@@ -873,7 +873,8 @@
heap_bitmap->Walk(InitFromImageCallback, this);
// reinit class_roots_
- Object* class_roots_object = spaces[0]->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots);
+ Object* class_roots_object =
+ spaces[0]->AsImageSpace()->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots);
class_roots_ = class_roots_object->AsObjectArray<Class>();
// reinit array_iftable_ from any array class instance, they should be ==
@@ -2568,7 +2569,7 @@
size_t actual_count = klass->GetSuperClass()->GetVTable()->GetLength();
CHECK_LE(actual_count, max_count);
// TODO: do not assign to the vtable field until it is fully constructed.
- ObjectArray<Method>* vtable = klass->GetSuperClass()->GetVTable()->CopyOf(max_count);
+ SirtRef<ObjectArray<Method> > vtable(klass->GetSuperClass()->GetVTable()->CopyOf(max_count));
// See if any of our virtual methods override the superclass.
MethodHelper local_mh(NULL, this);
MethodHelper super_mh(NULL, this);
@@ -2607,9 +2608,9 @@
// Shrink vtable if possible
CHECK_LE(actual_count, max_count);
if (actual_count < max_count) {
- vtable = vtable->CopyOf(actual_count);
+ vtable.reset(vtable->CopyOf(actual_count));
}
- klass->SetVTable(vtable);
+ klass->SetVTable(vtable.get());
} else {
CHECK(klass.get() == GetClassRoot(kJavaLangObject));
uint32_t num_virtual_methods = klass->NumVirtualMethods();
@@ -2775,11 +2776,11 @@
? AllocObjectArray<Method>(new_method_count)
: klass->GetVirtualMethods()->CopyOf(new_method_count));
- ObjectArray<Method>* vtable = klass->GetVTableDuringLinking();
- CHECK(vtable != NULL);
+ SirtRef<ObjectArray<Method> > vtable(klass->GetVTableDuringLinking());
+ CHECK(vtable.get() != NULL);
int old_vtable_count = vtable->GetLength();
int new_vtable_count = old_vtable_count + miranda_list.size();
- vtable = vtable->CopyOf(new_vtable_count);
+ vtable.reset(vtable->CopyOf(new_vtable_count));
for (size_t i = 0; i < miranda_list.size(); ++i) {
Method* method = miranda_list[i];
// Leave the declaring class alone as type indices are relative to it
@@ -2789,7 +2790,7 @@
vtable->Set(old_vtable_count + i, method);
}
// TODO: do not assign to the vtable field until it is fully constructed.
- klass->SetVTable(vtable);
+ klass->SetVTable(vtable.get());
}
ObjectArray<Method>* vtable = klass->GetVTableDuringLinking();
diff --git a/src/class_linker.h b/src/class_linker.h
index 1c5de63..8471cbc 100644
--- a/src/class_linker.h
+++ b/src/class_linker.h
@@ -35,6 +35,7 @@
namespace art {
class ClassLoader;
+class ImageSpace;
class InternTable;
class ObjectLock;
@@ -282,7 +283,7 @@
// Initialize class linker from one or more images.
void InitFromImage();
- OatFile* OpenOat(const Space* space);
+ OatFile* OpenOat(const ImageSpace* space);
static void InitFromImageCallback(Object* obj, void* arg);
struct InitFromImageCallbackState;
diff --git a/src/common_test.h b/src/common_test.h
index 14adfbe..15893b2 100644
--- a/src/common_test.h
+++ b/src/common_test.h
@@ -228,12 +228,15 @@
boot_class_path += "-Xbootclasspath:";
boot_class_path += GetLibCoreDexFileName();
+ std::string min_heap_string = StringPrintf("-Xms%dm",Heap::kInitialSize / MB);
+ std::string max_heap_string = StringPrintf("-Xmx%dm",Heap::kMaximumSize / MB);
+
Runtime::Options options;
options.push_back(std::make_pair("compiler", reinterpret_cast<void*>(NULL)));
options.push_back(std::make_pair(boot_class_path.c_str(), reinterpret_cast<void*>(NULL)));
options.push_back(std::make_pair("-Xcheck:jni", reinterpret_cast<void*>(NULL)));
- options.push_back(std::make_pair("-Xms64m", reinterpret_cast<void*>(NULL)));
- options.push_back(std::make_pair("-Xmx64m", reinterpret_cast<void*>(NULL)));
+ options.push_back(std::make_pair(min_heap_string.c_str(), reinterpret_cast<void*>(NULL)));
+ options.push_back(std::make_pair(max_heap_string.c_str(), reinterpret_cast<void*>(NULL)));
runtime_.reset(Runtime::Create(options, false));
ASSERT_TRUE(runtime_.get() != NULL);
class_linker_ = runtime_->GetClassLinker();
diff --git a/src/debugger.cc b/src/debugger.cc
index f8f5248..ef3ac88 100644
--- a/src/debugger.cc
+++ b/src/debugger.cc
@@ -26,6 +26,7 @@
#include "object_utils.h"
#include "ScopedLocalRef.h"
#include "ScopedPrimitiveArray.h"
+#include "space.h"
#include "stack_indirect_reference_table.h"
#include "thread_list.h"
@@ -2035,78 +2036,84 @@
#define HPSG_PARTIAL (1<<7)
#define HPSG_STATE(solidity, kind) ((uint8_t)((((kind) & 0x7) << 3) | ((solidity) & 0x7)))
-struct HeapChunkContext {
- std::vector<uint8_t> buf;
- uint8_t* p;
- uint8_t* pieceLenField;
- size_t totalAllocationUnits;
- uint32_t type;
- bool merge;
- bool needHeader;
-
+class HeapChunkContext {
+ public:
// Maximum chunk size. Obtain this from the formula:
// (((maximum_heap_size / ALLOCATION_UNIT_SIZE) + 255) / 256) * 2
HeapChunkContext(bool merge, bool native)
- : buf(16384 - 16),
- type(0),
- merge(merge) {
+ : buf_(16384 - 16),
+ type_(0),
+ merge_(merge) {
Reset();
if (native) {
- type = CHUNK_TYPE("NHSG");
+ type_ = CHUNK_TYPE("NHSG");
} else {
- type = merge ? CHUNK_TYPE("HPSG") : CHUNK_TYPE("HPSO");
+ type_ = merge ? CHUNK_TYPE("HPSG") : CHUNK_TYPE("HPSO");
}
}
~HeapChunkContext() {
- if (p > &buf[0]) {
+ if (p_ > &buf_[0]) {
Flush();
}
}
void EnsureHeader(const void* chunk_ptr) {
- if (!needHeader) {
+ if (!needHeader_) {
return;
}
// Start a new HPSx chunk.
- JDWP::Write4BE(&p, 1); // Heap id (bogus; we only have one heap).
- JDWP::Write1BE(&p, 8); // Size of allocation unit, in bytes.
+ JDWP::Write4BE(&p_, 1); // Heap id (bogus; we only have one heap).
+ JDWP::Write1BE(&p_, 8); // Size of allocation unit, in bytes.
- JDWP::Write4BE(&p, reinterpret_cast<uintptr_t>(chunk_ptr)); // virtual address of segment start.
- JDWP::Write4BE(&p, 0); // offset of this piece (relative to the virtual address).
+ JDWP::Write4BE(&p_, reinterpret_cast<uintptr_t>(chunk_ptr)); // virtual address of segment start.
+ JDWP::Write4BE(&p_, 0); // offset of this piece (relative to the virtual address).
// [u4]: length of piece, in allocation units
// We won't know this until we're done, so save the offset and stuff in a dummy value.
- pieceLenField = p;
- JDWP::Write4BE(&p, 0x55555555);
- needHeader = false;
+ pieceLenField_ = p_;
+ JDWP::Write4BE(&p_, 0x55555555);
+ needHeader_ = false;
}
void Flush() {
// Patch the "length of piece" field.
- CHECK_LE(&buf[0], pieceLenField);
- CHECK_LE(pieceLenField, p);
- JDWP::Set4BE(pieceLenField, totalAllocationUnits);
+ CHECK_LE(&buf_[0], pieceLenField_);
+ CHECK_LE(pieceLenField_, p_);
+ JDWP::Set4BE(pieceLenField_, totalAllocationUnits_);
- Dbg::DdmSendChunk(type, p - &buf[0], &buf[0]);
+ Dbg::DdmSendChunk(type_, p_ - &buf_[0], &buf_[0]);
Reset();
}
- static void HeapChunkCallback(const void* chunk_ptr, size_t chunk_len, const void* user_ptr, size_t user_len, void* arg) {
- reinterpret_cast<HeapChunkContext*>(arg)->HeapChunkCallback(chunk_ptr, chunk_len, user_ptr, user_len);
+ static void HeapChunkCallback(void* start, void* end, size_t used_bytes, void* arg) {
+ reinterpret_cast<HeapChunkContext*>(arg)->HeapChunkCallback(start, end, used_bytes);
}
private:
enum { ALLOCATION_UNIT_SIZE = 8 };
void Reset() {
- p = &buf[0];
- totalAllocationUnits = 0;
- needHeader = true;
- pieceLenField = NULL;
+ p_ = &buf_[0];
+ totalAllocationUnits_ = 0;
+ needHeader_ = true;
+ pieceLenField_ = NULL;
}
- void HeapChunkCallback(const void* chunk_ptr, size_t chunk_len, const void* user_ptr, size_t user_len) {
+ void HeapChunkCallback(void* start, void* end, size_t used_bytes) {
+ // Note: heap call backs cannot manipulate the heap upon which they are crawling, care is taken
+ // in the following code not to allocate memory, by ensuring buf_ is of the correct size
+
+ const void* user_ptr = used_bytes > 0 ? const_cast<void*>(start) : NULL;
+ // from malloc.c mem2chunk(mem)
+ const void* chunk_ptr =
+ reinterpret_cast<const void*>(reinterpret_cast<const char*>(const_cast<void*>(start)) -
+ (2 * sizeof(size_t)));
+ // from malloc.c chunksize
+ size_t chunk_len = (*reinterpret_cast<size_t* const*>(chunk_ptr))[1] & ~7;
+
+
+ //size_t chunk_len = malloc_usable_size(user_ptr);
CHECK_EQ((chunk_len & (ALLOCATION_UNIT_SIZE-1)), 0U);
/* Make sure there's enough room left in the buffer.
@@ -2115,12 +2122,12 @@
*/
{
size_t needed = (((chunk_len/ALLOCATION_UNIT_SIZE + 255) / 256) * 2);
- size_t bytesLeft = buf.size() - (size_t)(p - &buf[0]);
+ size_t bytesLeft = buf_.size() - (size_t)(p_ - &buf_[0]);
if (bytesLeft < needed) {
Flush();
}
- bytesLeft = buf.size() - (size_t)(p - &buf[0]);
+ bytesLeft = buf_.size() - (size_t)(p_ - &buf_[0]);
if (bytesLeft < needed) {
LOG(WARNING) << "Chunk is too big to transmit (chunk_len=" << chunk_len << ", " << needed << " bytes)";
return;
@@ -2133,18 +2140,18 @@
// Determine the type of this chunk.
// OLD-TODO: if context.merge, see if this chunk is different from the last chunk.
// If it's the same, we should combine them.
- uint8_t state = ExamineObject(reinterpret_cast<const Object*>(user_ptr), (type == CHUNK_TYPE("NHSG")));
+ uint8_t state = ExamineObject(reinterpret_cast<const Object*>(user_ptr), (type_ == CHUNK_TYPE("NHSG")));
// Write out the chunk description.
chunk_len /= ALLOCATION_UNIT_SIZE; // convert to allocation units
- totalAllocationUnits += chunk_len;
+ totalAllocationUnits_ += chunk_len;
while (chunk_len > 256) {
- *p++ = state | HPSG_PARTIAL;
- *p++ = 255; // length - 1
+ *p_++ = state | HPSG_PARTIAL;
+ *p_++ = 255; // length - 1
chunk_len -= 256;
}
- *p++ = state;
- *p++ = chunk_len - 1;
+ *p_++ = state;
+ *p_++ = chunk_len - 1;
}
uint8_t ExamineObject(const Object* o, bool is_native_heap) {
@@ -2190,6 +2197,14 @@
return HPSG_STATE(SOLIDITY_HARD, KIND_OBJECT);
}
+ std::vector<uint8_t> buf_;
+ uint8_t* p_;
+ uint8_t* pieceLenField_;
+ size_t totalAllocationUnits_;
+ uint32_t type_;
+ bool merge_;
+ bool needHeader_;
+
DISALLOW_COPY_AND_ASSIGN(HeapChunkContext);
};
@@ -2218,9 +2233,11 @@
// Send a series of heap segment chunks.
HeapChunkContext context((what == HPSG_WHAT_MERGED_OBJECTS), native);
if (native) {
- dlmalloc_walk_heap(HeapChunkContext::HeapChunkCallback, &context);
+ // TODO: enable when bionic has moved to dlmalloc 2.8.5
+ // dlmalloc_inspect_all(HeapChunkContext::HeapChunkCallback, &context);
+ UNIMPLEMENTED(WARNING) << "Native heap send heap segments";
} else {
- Heap::WalkHeap(HeapChunkContext::HeapChunkCallback, &context);
+ Heap::GetAllocSpace()->Walk(HeapChunkContext::HeapChunkCallback, &context);
}
// Finally, send a heap end chunk.
diff --git a/src/dex2oat.cc b/src/dex2oat.cc
index b3aec1a..cd977b5 100644
--- a/src/dex2oat.cc
+++ b/src/dex2oat.cc
@@ -201,11 +201,17 @@
const std::string& host_prefix) {
// If we have an existing boot image, position new space after its oat file
if (Heap::GetSpaces().size() > 1) {
- Space* last_image_space = Heap::GetSpaces()[Heap::GetSpaces().size()-2];
+ ImageSpace* last_image_space = NULL;
+ const std::vector<Space*>& spaces = Heap::GetSpaces();
+ for (size_t i=0; i < spaces.size(); i++) {
+ if (spaces[i]->IsImageSpace()) {
+ last_image_space = spaces[i]->AsImageSpace();
+ }
+ }
CHECK(last_image_space != NULL);
CHECK(last_image_space->IsImageSpace());
CHECK(!Heap::GetSpaces()[Heap::GetSpaces().size()-1]->IsImageSpace());
- byte* oat_limit_addr = last_image_space->GetImageHeader().GetOatLimitAddr();
+ byte* oat_limit_addr = last_image_space->GetImageHeader().GetOatEnd();
image_base = RoundUp(reinterpret_cast<uintptr_t>(oat_limit_addr), kPageSize);
}
diff --git a/src/dex_file.cc b/src/dex_file.cc
index 3f141b1..e119ce0 100644
--- a/src/dex_file.cc
+++ b/src/dex_file.cc
@@ -72,7 +72,7 @@
}
void DexFile::ChangePermissions(int prot) const {
- if (mprotect(mem_map_->GetAddress(), mem_map_->GetLength(), prot) != 0) {
+ if (mprotect(mem_map_->Begin(), mem_map_->Size(), prot) != 0) {
PLOG(FATAL) << "Failed to change dex file permissions to " << prot << " for " << GetLocation();
}
}
@@ -193,7 +193,7 @@
return dex_object_;
}
- void* address = const_cast<void*>(reinterpret_cast<const void*>(base_));
+ void* address = const_cast<void*>(reinterpret_cast<const void*>(begin_));
jobject byte_buffer = env->NewDirectByteBuffer(address, length_);
if (byte_buffer == NULL) {
return NULL;
@@ -226,14 +226,14 @@
return false;
}
InitIndex();
- if (!DexFileVerifier::Verify(this, base_, length_)) {
+ if (!DexFileVerifier::Verify(this, begin_, length_)) {
return false;
}
return true;
}
void DexFile::InitMembers() {
- const byte* b = base_;
+ const byte* b = begin_;
header_ = reinterpret_cast<const Header*>(b);
const Header* h = header_;
string_ids_ = reinterpret_cast<const StringId*>(b + h->string_ids_off_);
@@ -281,14 +281,14 @@
}
int32_t DexFile::GetStringLength(const StringId& string_id) const {
- const byte* ptr = base_ + string_id.string_data_off_;
+ const byte* ptr = begin_ + string_id.string_data_off_;
return DecodeUnsignedLeb128(&ptr);
}
// Returns a pointer to the UTF-8 string data referred to by the given string_id.
const char* DexFile::GetStringDataAndLength(const StringId& string_id, int32_t* length) const {
CHECK(length != NULL) << GetLocation();
- const byte* ptr = base_ + string_id.string_data_off_;
+ const byte* ptr = begin_ + string_id.string_data_off_;
*length = DecodeUnsignedLeb128(&ptr);
return reinterpret_cast<const char*>(ptr);
}
diff --git a/src/dex_file.h b/src/dex_file.h
index 2f2106b..81813c3 100644
--- a/src/dex_file.h
+++ b/src/dex_file.h
@@ -551,7 +551,7 @@
if (class_def.interfaces_off_ == 0) {
return NULL;
} else {
- const byte* addr = base_ + class_def.interfaces_off_;
+ const byte* addr = begin_ + class_def.interfaces_off_;
return reinterpret_cast<const TypeList*>(addr);
}
}
@@ -561,7 +561,7 @@
if (class_def.class_data_off_ == 0) {
return NULL;
} else {
- return base_ + class_def.class_data_off_;
+ return begin_ + class_def.class_data_off_;
}
}
@@ -570,7 +570,7 @@
if (code_off == 0) {
return NULL; // native or abstract method
} else {
- const byte* addr = base_ + code_off;
+ const byte* addr = begin_ + code_off;
return reinterpret_cast<const CodeItem*>(addr);
}
}
@@ -618,7 +618,7 @@
if (proto_id.parameters_off_ == 0) {
return NULL;
} else {
- const byte* addr = base_ + proto_id.parameters_off_;
+ const byte* addr = begin_ + proto_id.parameters_off_;
return reinterpret_cast<const TypeList*>(addr);
}
}
@@ -627,7 +627,7 @@
if (class_def.static_values_off_ == 0) {
return 0;
} else {
- return base_ + class_def.static_values_off_;
+ return begin_ + class_def.static_values_off_;
}
}
@@ -655,7 +655,7 @@
if (code_item->debug_info_off_ == 0) {
return NULL;
} else {
- return base_ + code_item->debug_info_off_;
+ return begin_ + code_item->debug_info_off_;
}
}
@@ -761,8 +761,8 @@
// Opens a .dex file at the given address backed by a MemMap
static const DexFile* OpenMemory(const std::string& location,
MemMap* mem_map) {
- return OpenMemory(mem_map->GetAddress(),
- mem_map->GetLength(),
+ return OpenMemory(mem_map->Begin(),
+ mem_map->Size(),
location,
mem_map);
}
@@ -774,7 +774,7 @@
MemMap* mem_map);
DexFile(const byte* base, size_t length, const std::string& location, MemMap* mem_map)
- : base_(base),
+ : begin_(base),
length_(length),
location_(location),
mem_map_(mem_map),
@@ -787,7 +787,7 @@
method_ids_(0),
proto_ids_(0),
class_defs_(0) {
- CHECK(base_ != NULL) << GetLocation();
+ CHECK(begin_ != NULL) << GetLocation();
CHECK_GT(length_, 0U) << GetLocation();
}
@@ -812,7 +812,7 @@
Index index_;
// The base address of the memory mapping.
- const byte* base_;
+ const byte* begin_;
// The size of the underlying memory allocation in bytes.
size_t length_;
diff --git a/src/dex_file_verifier.cc b/src/dex_file_verifier.cc
index 6a53ebe..90c0a87 100644
--- a/src/dex_file_verifier.cc
+++ b/src/dex_file_verifier.cc
@@ -85,15 +85,15 @@
return true;
}
-bool DexFileVerifier::Verify(DexFile* dex_file, const byte* base, size_t length) {
- UniquePtr<DexFileVerifier> verifier(new DexFileVerifier(dex_file, base, length));
+bool DexFileVerifier::Verify(DexFile* dex_file, const byte* begin, size_t length) {
+ UniquePtr<DexFileVerifier> verifier(new DexFileVerifier(dex_file, begin, length));
return verifier->Verify();
}
bool DexFileVerifier::CheckPointerRange(const void* start, const void* end, const char* label) const {
uint32_t range_start = reinterpret_cast<uint32_t>(start);
uint32_t range_end = reinterpret_cast<uint32_t>(end);
- uint32_t file_start = reinterpret_cast<uint32_t>(base_);
+ uint32_t file_start = reinterpret_cast<uint32_t>(begin_);
uint32_t file_end = file_start + length_;
if ((range_start < file_start) || (range_start > file_end) ||
(range_end < file_start) || (range_end > file_end)) {
@@ -151,7 +151,7 @@
}
bool DexFileVerifier::CheckMap() const {
- const DexFile::MapList* map = reinterpret_cast<const DexFile::MapList*>(base_ + header_->map_off_);
+ const DexFile::MapList* map = reinterpret_cast<const DexFile::MapList*>(begin_ + header_->map_off_);
const DexFile::MapItem* item = map->list_;
uint32_t count = map->size_;
@@ -366,7 +366,7 @@
bool DexFileVerifier::CheckPadding(uint32_t offset, uint32_t aligned_offset) {
if (offset < aligned_offset) {
- if (!CheckPointerRange(base_ + offset, base_ + aligned_offset, "section")) {
+ if (!CheckPointerRange(begin_ + offset, begin_ + aligned_offset, "section")) {
return false;
}
while (offset < aligned_offset) {
@@ -671,7 +671,7 @@
bool DexFileVerifier::CheckIntraStringDataItem() {
uint32_t size = DecodeUnsignedLeb128(&ptr_);
- const byte* file_end = base_ + length_;
+ const byte* file_end = begin_ + length_;
for (uint32_t i = 0; i < size; i++) {
if (ptr_ >= file_end) {
@@ -1106,7 +1106,7 @@
offset_to_type_map_.insert(std::make_pair(aligned_offset, type));
}
- aligned_offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(base_);
+ aligned_offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(begin_);
if (aligned_offset > length_) {
LOG(ERROR) << StringPrintf("Item %d at ends out of bounds", i);
return false;
@@ -1180,7 +1180,7 @@
return false;
}
- uint32_t next_offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(base_);
+ uint32_t next_offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(begin_);
if (next_offset > data_end) {
LOG(ERROR) << StringPrintf("Out-of-bounds end of data subsection: %x", next_offset);
return false;
@@ -1190,12 +1190,12 @@
}
bool DexFileVerifier::CheckIntraSection() {
- const DexFile::MapList* map = reinterpret_cast<const DexFile::MapList*>(base_ + header_->map_off_);
+ const DexFile::MapList* map = reinterpret_cast<const DexFile::MapList*>(begin_ + header_->map_off_);
const DexFile::MapItem* item = map->list_;
uint32_t count = map->size_;
uint32_t offset = 0;
- ptr_ = base_;
+ ptr_ = begin_;
// Check the items listed in the map.
while (count--) {
@@ -1222,7 +1222,7 @@
LOG(ERROR) << StringPrintf("Header at %x, not at start of file", section_offset);
return false;
}
- ptr_ = base_ + header_->header_size_;
+ ptr_ = begin_ + header_->header_size_;
offset = header_->header_size_;
break;
case DexFile::kDexTypeStringIdItem:
@@ -1234,7 +1234,7 @@
if (!CheckIntraIdSection(section_offset, section_count, type)) {
return false;
}
- offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(base_);
+ offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(begin_);
break;
case DexFile::kDexTypeMapList:
if (section_count != 1) {
@@ -1261,7 +1261,7 @@
if (!CheckIntraDataSection(section_offset, section_count, type)) {
return false;
}
- offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(base_);
+ offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(begin_);
break;
default:
LOG(ERROR) << StringPrintf("Unknown map item type %x", type);
@@ -1593,7 +1593,7 @@
// Check that references in class_data_item are to the right class.
if (item->class_data_off_ != 0) {
- const byte* data = base_ + item->class_data_off_;
+ const byte* data = begin_ + item->class_data_off_;
uint16_t data_definer = FindFirstClassDataDefiner(data);
if ((data_definer != item->class_idx_) && (data_definer != DexFile::kDexNoIndex16)) {
LOG(ERROR) << "Invalid class_data_item";
@@ -1603,7 +1603,7 @@
// Check that references in annotations_directory_item are to right class.
if (item->annotations_off_ != 0) {
- const byte* data = base_ + item->annotations_off_;
+ const byte* data = begin_ + item->annotations_off_;
uint16_t annotations_definer = FindFirstAnnotationsDirectoryDefiner(data);
if ((annotations_definer != item->class_idx_) && (annotations_definer != DexFile::kDexNoIndex16)) {
LOG(ERROR) << "Invalid annotations_directory_item";
@@ -1646,7 +1646,7 @@
// Get the annotation from the offset and the type index for the annotation.
const DexFile::AnnotationItem* annotation =
- reinterpret_cast<const DexFile::AnnotationItem*>(base_ + *offsets);
+ reinterpret_cast<const DexFile::AnnotationItem*>(begin_ + *offsets);
const uint8_t* data = annotation->annotation_;
uint32_t idx = DecodeUnsignedLeb128(&data);
@@ -1768,7 +1768,7 @@
previous_item_ = NULL;
for (uint32_t i = 0; i < count; i++) {
uint32_t new_offset = (offset + alignment_mask) & ~alignment_mask;
- ptr_ = base_ + new_offset;
+ ptr_ = begin_ + new_offset;
const byte* prev_ptr = ptr_;
// Check depending on the section type.
@@ -1839,14 +1839,14 @@
}
previous_item_ = prev_ptr;
- offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(base_);
+ offset = reinterpret_cast<uint32_t>(ptr_) - reinterpret_cast<uint32_t>(begin_);
}
return true;
}
bool DexFileVerifier::CheckInterSection() {
- const DexFile::MapList* map = reinterpret_cast<const DexFile::MapList*>(base_ + header_->map_off_);
+ const DexFile::MapList* map = reinterpret_cast<const DexFile::MapList*>(begin_ + header_->map_off_);
const DexFile::MapItem* item = map->list_;
uint32_t count = map->size_;
diff --git a/src/dex_file_verifier.h b/src/dex_file_verifier.h
index 6b8fcf4..9b66b6e 100644
--- a/src/dex_file_verifier.h
+++ b/src/dex_file_verifier.h
@@ -11,11 +11,11 @@
class DexFileVerifier {
public:
- static bool Verify(DexFile* dex_file, const byte* base, size_t length);
+ static bool Verify(DexFile* dex_file, const byte* begin, size_t length);
private:
- DexFileVerifier(DexFile* dex_file, const byte* base, size_t length)
- : dex_file_(dex_file), base_(base), length_(length),
+ DexFileVerifier(DexFile* dex_file, const byte* begin, size_t length)
+ : dex_file_(dex_file), begin_(begin), length_(length),
header_(&dex_file->GetHeader()), ptr_(NULL), previous_item_(NULL) {
}
@@ -70,7 +70,7 @@
bool CheckInterSection();
DexFile* dex_file_;
- const byte* base_;
+ const byte* begin_;
size_t length_;
const DexFile::Header* header_;
diff --git a/src/dlmalloc.c b/src/dlmalloc.c
index e366ec9..931a44e 100644
--- a/src/dlmalloc.c
+++ b/src/dlmalloc.c
@@ -1,5454 +1,19 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-/*
- This is a version (aka dlmalloc) of malloc/free/realloc written by
- Doug Lea and released to the public domain, as explained at
- http://creativecommons.org/licenses/publicdomain. Send questions,
- comments, complaints, performance data, etc to dl@cs.oswego.edu
+// Copyright 2012 Google Inc. All Rights Reserved.
+#define FOR_DLMALLOC_C // Avoid inclusion of src/malloc.h
+#include "dlmalloc.h"
-* Version 2.8.3 Thu Sep 22 11:16:15 2005 Doug Lea (dl at gee)
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
- Note: There may be an updated version of this malloc obtainable at
- ftp://gee.cs.oswego.edu/pub/misc/malloc.c
- Check before installing!
+// Disable GCC diagnostics so that -Werror won't fail
+#pragma GCC diagnostic ignored "-Wsign-compare"
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wempty-body"
-* Quickstart
+// ART specific morecore implementation
+#define MORECORE(x) art_heap_morecore(m, x)
+extern void* art_heap_morecore(void* m, intptr_t increment);
- This library is all in one file to simplify the most common usage:
- ftp it, compile it (-O3), and link it into another program. All of
- the compile-time options default to reasonable values for use on
- most platforms. You might later want to step through various
- compile-time and dynamic tuning options.
-
- For convenience, an include file for code using this malloc is at:
- ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.3.h
- You don't really need this .h file unless you call functions not
- defined in your system include files. The .h file contains only the
- excerpts from this file needed for using this malloc on ANSI C/C++
- systems, so long as you haven't changed compile-time options about
- naming and tuning parameters. If you do, then you can create your
- own malloc.h that does include all settings by cutting at the point
- indicated below. Note that you may already by default be using a C
- library containing a malloc that is based on some version of this
- malloc (for example in linux). You might still want to use the one
- in this file to customize settings or to avoid overheads associated
- with library versions.
-
-* Vital statistics:
-
- Supported pointer/size_t representation: 4 or 8 bytes
- size_t MUST be an unsigned type of the same width as
- pointers. (If you are using an ancient system that declares
- size_t as a signed type, or need it to be a different width
- than pointers, you can use a previous release of this malloc
- (e.g. 2.7.2) supporting these.)
-
- Alignment: 8 bytes (default)
- This suffices for nearly all current machines and C compilers.
- However, you can define MALLOC_ALIGNMENT to be wider than this
- if necessary (up to 128bytes), at the expense of using more space.
-
- Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes)
- 8 or 16 bytes (if 8byte sizes)
- Each malloced chunk has a hidden word of overhead holding size
- and status information, and additional cross-check word
- if FOOTERS is defined.
-
- Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead)
- 8-byte ptrs: 32 bytes (including overhead)
-
- Even a request for zero bytes (i.e., malloc(0)) returns a
- pointer to something of the minimum allocatable size.
- The maximum overhead wastage (i.e., number of extra bytes
- allocated than were requested in malloc) is less than or equal
- to the minimum size, except for requests >= mmap_threshold that
- are serviced via mmap(), where the worst case wastage is about
- 32 bytes plus the remainder from a system page (the minimal
- mmap unit); typically 4096 or 8192 bytes.
-
- Security: static-safe; optionally more or less
- The "security" of malloc refers to the ability of malicious
- code to accentuate the effects of errors (for example, freeing
- space that is not currently malloc'ed or overwriting past the
- ends of chunks) in code that calls malloc. This malloc
- guarantees not to modify any memory locations below the base of
- heap, i.e., static variables, even in the presence of usage
- errors. The routines additionally detect most improper frees
- and reallocs. All this holds as long as the static bookkeeping
- for malloc itself is not corrupted by some other means. This
- is only one aspect of security -- these checks do not, and
- cannot, detect all possible programming errors.
-
- If FOOTERS is defined nonzero, then each allocated chunk
- carries an additional check word to verify that it was malloced
- from its space. These check words are the same within each
- execution of a program using malloc, but differ across
- executions, so externally crafted fake chunks cannot be
- freed. This improves security by rejecting frees/reallocs that
- could corrupt heap memory, in addition to the checks preventing
- writes to statics that are always on. This may further improve
- security at the expense of time and space overhead. (Note that
- FOOTERS may also be worth using with MSPACES.)
-
- By default detected errors cause the program to abort (calling
- "abort()"). You can override this to instead proceed past
- errors by defining PROCEED_ON_ERROR. In this case, a bad free
- has no effect, and a malloc that encounters a bad address
- caused by user overwrites will ignore the bad address by
- dropping pointers and indices to all known memory. This may
- be appropriate for programs that should continue if at all
- possible in the face of programming errors, although they may
- run out of memory because dropped memory is never reclaimed.
-
- If you don't like either of these options, you can define
- CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything
- else. And if if you are sure that your program using malloc has
- no errors or vulnerabilities, you can define INSECURE to 1,
- which might (or might not) provide a small performance improvement.
-
- Thread-safety: NOT thread-safe unless USE_LOCKS defined
- When USE_LOCKS is defined, each public call to malloc, free,
- etc is surrounded with either a pthread mutex or a win32
- spinlock (depending on WIN32). This is not especially fast, and
- can be a major bottleneck. It is designed only to provide
- minimal protection in concurrent environments, and to provide a
- basis for extensions. If you are using malloc in a concurrent
- program, consider instead using ptmalloc, which is derived from
- a version of this malloc. (See http://www.malloc.de).
-
- System requirements: Any combination of MORECORE and/or MMAP/MUNMAP
- This malloc can use unix sbrk or any emulation (invoked using
- the CALL_MORECORE macro) and/or mmap/munmap or any emulation
- (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system
- memory. On most unix systems, it tends to work best if both
- MORECORE and MMAP are enabled. On Win32, it uses emulations
- based on VirtualAlloc. It also uses common C library functions
- like memset.
-
- Compliance: I believe it is compliant with the Single Unix Specification
- (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably
- others as well.
-
-* Overview of algorithms
-
- This is not the fastest, most space-conserving, most portable, or
- most tunable malloc ever written. However it is among the fastest
- while also being among the most space-conserving, portable and
- tunable. Consistent balance across these factors results in a good
- general-purpose allocator for malloc-intensive programs.
-
- In most ways, this malloc is a best-fit allocator. Generally, it
- chooses the best-fitting existing chunk for a request, with ties
- broken in approximately least-recently-used order. (This strategy
- normally maintains low fragmentation.) However, for requests less
- than 256bytes, it deviates from best-fit when there is not an
- exactly fitting available chunk by preferring to use space adjacent
- to that used for the previous small request, as well as by breaking
- ties in approximately most-recently-used order. (These enhance
- locality of series of small allocations.) And for very large requests
- (>= 256Kb by default), it relies on system memory mapping
- facilities, if supported. (This helps avoid carrying around and
- possibly fragmenting memory used only for large chunks.)
-
- All operations (except malloc_stats and mallinfo) have execution
- times that are bounded by a constant factor of the number of bits in
- a size_t, not counting any clearing in calloc or copying in realloc,
- or actions surrounding MORECORE and MMAP that have times
- proportional to the number of non-contiguous regions returned by
- system allocation routines, which is often just 1.
-
- The implementation is not very modular and seriously overuses
- macros. Perhaps someday all C compilers will do as good a job
- inlining modular code as can now be done by brute-force expansion,
- but now, enough of them seem not to.
-
- Some compilers issue a lot of warnings about code that is
- dead/unreachable only on some platforms, and also about intentional
- uses of negation on unsigned types. All known cases of each can be
- ignored.
-
- For a longer but out of date high-level description, see
- http://gee.cs.oswego.edu/dl/html/malloc.html
-
-* MSPACES
- If MSPACES is defined, then in addition to malloc, free, etc.,
- this file also defines mspace_malloc, mspace_free, etc. These
- are versions of malloc routines that take an "mspace" argument
- obtained using create_mspace, to control all internal bookkeeping.
- If ONLY_MSPACES is defined, only these versions are compiled.
- So if you would like to use this allocator for only some allocations,
- and your system malloc for others, you can compile with
- ONLY_MSPACES and then do something like...
- static mspace mymspace = create_mspace(0,0); // for example
- #define mymalloc(bytes) mspace_malloc(mymspace, bytes)
-
- (Note: If you only need one instance of an mspace, you can instead
- use "USE_DL_PREFIX" to relabel the global malloc.)
-
- You can similarly create thread-local allocators by storing
- mspaces as thread-locals. For example:
- static __thread mspace tlms = 0;
- void* tlmalloc(size_t bytes) {
- if (tlms == 0) tlms = create_mspace(0, 0);
- return mspace_malloc(tlms, bytes);
- }
- void tlfree(void* mem) { mspace_free(tlms, mem); }
-
- Unless FOOTERS is defined, each mspace is completely independent.
- You cannot allocate from one and free to another (although
- conformance is only weakly checked, so usage errors are not always
- caught). If FOOTERS is defined, then each chunk carries around a tag
- indicating its originating mspace, and frees are directed to their
- originating spaces.
-
- ------------------------- Compile-time options ---------------------------
-
-Be careful in setting #define values for numerical constants of type
-size_t. On some systems, literal values are not automatically extended
-to size_t precision unless they are explicitly casted.
-
-WIN32 default: defined if _WIN32 defined
- Defining WIN32 sets up defaults for MS environment and compilers.
- Otherwise defaults are for unix.
-
-MALLOC_ALIGNMENT default: (size_t)8
- Controls the minimum alignment for malloc'ed chunks. It must be a
- power of two and at least 8, even on machines for which smaller
- alignments would suffice. It may be defined as larger than this
- though. Note however that code and data structures are optimized for
- the case of 8-byte alignment.
-
-MSPACES default: 0 (false)
- If true, compile in support for independent allocation spaces.
- This is only supported if HAVE_MMAP is true.
-
-ONLY_MSPACES default: 0 (false)
- If true, only compile in mspace versions, not regular versions.
-
-USE_LOCKS default: 0 (false)
- Causes each call to each public routine to be surrounded with
- pthread or WIN32 mutex lock/unlock. (If set true, this can be
- overridden on a per-mspace basis for mspace versions.)
-
-FOOTERS default: 0
- If true, provide extra checking and dispatching by placing
- information in the footers of allocated chunks. This adds
- space and time overhead.
-
-INSECURE default: 0
- If true, omit checks for usage errors and heap space overwrites.
-
-USE_DL_PREFIX default: NOT defined
- Causes compiler to prefix all public routines with the string 'dl'.
- This can be useful when you only want to use this malloc in one part
- of a program, using your regular system malloc elsewhere.
-
-ABORT default: defined as abort()
- Defines how to abort on failed checks. On most systems, a failed
- check cannot die with an "assert" or even print an informative
- message, because the underlying print routines in turn call malloc,
- which will fail again. Generally, the best policy is to simply call
- abort(). It's not very useful to do more than this because many
- errors due to overwriting will show up as address faults (null, odd
- addresses etc) rather than malloc-triggered checks, so will also
- abort. Also, most compilers know that abort() does not return, so
- can better optimize code conditionally calling it.
-
-PROCEED_ON_ERROR default: defined as 0 (false)
- Controls whether detected bad addresses cause them to bypassed
- rather than aborting. If set, detected bad arguments to free and
- realloc are ignored. And all bookkeeping information is zeroed out
- upon a detected overwrite of freed heap space, thus losing the
- ability to ever return it from malloc again, but enabling the
- application to proceed. If PROCEED_ON_ERROR is defined, the
- static variable malloc_corruption_error_count is compiled in
- and can be examined to see if errors have occurred. This option
- generates slower code than the default abort policy.
-
-DEBUG default: NOT defined
- The DEBUG setting is mainly intended for people trying to modify
- this code or diagnose problems when porting to new platforms.
- However, it may also be able to better isolate user errors than just
- using runtime checks. The assertions in the check routines spell
- out in more detail the assumptions and invariants underlying the
- algorithms. The checking is fairly extensive, and will slow down
- execution noticeably. Calling malloc_stats or mallinfo with DEBUG
- set will attempt to check every non-mmapped allocated and free chunk
- in the course of computing the summaries.
-
-ABORT_ON_ASSERT_FAILURE default: defined as 1 (true)
- Debugging assertion failures can be nearly impossible if your
- version of the assert macro causes malloc to be called, which will
- lead to a cascade of further failures, blowing the runtime stack.
- ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(),
- which will usually make debugging easier.
-
-MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32
- The action to take before "return 0" when malloc fails to be able to
- return memory because there is none available.
-
-HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES
- True if this system supports sbrk or an emulation of it.
-
-MORECORE default: sbrk
- The name of the sbrk-style system routine to call to obtain more
- memory. See below for guidance on writing custom MORECORE
- functions. The type of the argument to sbrk/MORECORE varies across
- systems. It cannot be size_t, because it supports negative
- arguments, so it is normally the signed type of the same width as
- size_t (sometimes declared as "intptr_t"). It doesn't much matter
- though. Internally, we only call it with arguments less than half
- the max value of a size_t, which should work across all reasonable
- possibilities, although sometimes generating compiler warnings. See
- near the end of this file for guidelines for creating a custom
- version of MORECORE.
-
-MORECORE_CONTIGUOUS default: 1 (true)
- If true, take advantage of fact that consecutive calls to MORECORE
- with positive arguments always return contiguous increasing
- addresses. This is true of unix sbrk. It does not hurt too much to
- set it true anyway, since malloc copes with non-contiguities.
- Setting it false when definitely non-contiguous saves time
- and possibly wasted space it would take to discover this though.
-
-MORECORE_CANNOT_TRIM default: NOT defined
- True if MORECORE cannot release space back to the system when given
- negative arguments. This is generally necessary only if you are
- using a hand-crafted MORECORE function that cannot handle negative
- arguments.
-
-HAVE_MMAP default: 1 (true)
- True if this system supports mmap or an emulation of it. If so, and
- HAVE_MORECORE is not true, MMAP is used for all system
- allocation. If set and HAVE_MORECORE is true as well, MMAP is
- primarily used to directly allocate very large blocks. It is also
- used as a backup strategy in cases where MORECORE fails to provide
- space from system. Note: A single call to MUNMAP is assumed to be
- able to unmap memory that may have be allocated using multiple calls
- to MMAP, so long as they are adjacent.
-
-HAVE_MREMAP default: 1 on linux, else 0
- If true realloc() uses mremap() to re-allocate large blocks and
- extend or shrink allocation spaces.
-
-MMAP_CLEARS default: 1 on unix
- True if mmap clears memory so calloc doesn't need to. This is true
- for standard unix mmap using /dev/zero.
-
-USE_BUILTIN_FFS default: 0 (i.e., not used)
- Causes malloc to use the builtin ffs() function to compute indices.
- Some compilers may recognize and intrinsify ffs to be faster than the
- supplied C version. Also, the case of x86 using gcc is special-cased
- to an asm instruction, so is already as fast as it can be, and so
- this setting has no effect. (On most x86s, the asm version is only
- slightly faster than the C version.)
-
-malloc_getpagesize default: derive from system includes, or 4096.
- The system page size. To the extent possible, this malloc manages
- memory from the system in page-size units. This may be (and
- usually is) a function rather than a constant. This is ignored
- if WIN32, where page size is determined using getSystemInfo during
- initialization.
-
-USE_DEV_RANDOM default: 0 (i.e., not used)
- Causes malloc to use /dev/random to initialize secure magic seed for
- stamping footers. Otherwise, the current time is used.
-
-NO_MALLINFO default: 0
- If defined, don't compile "mallinfo". This can be a simple way
- of dealing with mismatches between system declarations and
- those in this file.
-
-MALLINFO_FIELD_TYPE default: size_t
- The type of the fields in the mallinfo struct. This was originally
- defined as "int" in SVID etc, but is more usefully defined as
- size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set
-
-REALLOC_ZERO_BYTES_FREES default: not defined
- This should be set if a call to realloc with zero bytes should
- be the same as a call to free. Some people think it should. Otherwise,
- since this malloc returns a unique pointer for malloc(0), so does
- realloc(p, 0).
-
-LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H
-LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H
-LACKS_STDLIB_H default: NOT defined unless on WIN32
- Define these if your system does not have these header files.
- You might need to manually insert some of the declarations they provide.
-
-DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS,
- system_info.dwAllocationGranularity in WIN32,
- otherwise 64K.
- Also settable using mallopt(M_GRANULARITY, x)
- The unit for allocating and deallocating memory from the system. On
- most systems with contiguous MORECORE, there is no reason to
- make this more than a page. However, systems with MMAP tend to
- either require or encourage larger granularities. You can increase
- this value to prevent system allocation functions to be called so
- often, especially if they are slow. The value must be at least one
- page and must be a power of two. Setting to 0 causes initialization
- to either page size or win32 region size. (Note: In previous
- versions of malloc, the equivalent of this option was called
- "TOP_PAD")
-
-DEFAULT_TRIM_THRESHOLD default: 2MB
- Also settable using mallopt(M_TRIM_THRESHOLD, x)
- The maximum amount of unused top-most memory to keep before
- releasing via malloc_trim in free(). Automatic trimming is mainly
- useful in long-lived programs using contiguous MORECORE. Because
- trimming via sbrk can be slow on some systems, and can sometimes be
- wasteful (in cases where programs immediately afterward allocate
- more large chunks) the value should be high enough so that your
- overall system performance would improve by releasing this much
- memory. As a rough guide, you might set to a value close to the
- average size of a process (program) running on your system.
- Releasing this much memory would allow such a process to run in
- memory. Generally, it is worth tuning trim thresholds when a
- program undergoes phases where several large chunks are allocated
- and released in ways that can reuse each other's storage, perhaps
- mixed with phases where there are no such chunks at all. The trim
- value must be greater than page size to have any useful effect. To
- disable trimming completely, you can set to MAX_SIZE_T. Note that the trick
- some people use of mallocing a huge space and then freeing it at
- program startup, in an attempt to reserve system memory, doesn't
- have the intended effect under automatic trimming, since that memory
- will immediately be returned to the system.
-
-DEFAULT_MMAP_THRESHOLD default: 256K
- Also settable using mallopt(M_MMAP_THRESHOLD, x)
- The request size threshold for using MMAP to directly service a
- request. Requests of at least this size that cannot be allocated
- using already-existing space will be serviced via mmap. (If enough
- normal freed space already exists it is used instead.) Using mmap
- segregates relatively large chunks of memory so that they can be
- individually obtained and released from the host system. A request
- serviced through mmap is never reused by any other request (at least
- not directly; the system may just so happen to remap successive
- requests to the same locations). Segregating space in this way has
- the benefits that: Mmapped space can always be individually released
- back to the system, which helps keep the system level memory demands
- of a long-lived program low. Also, mapped memory doesn't become
- `locked' between other chunks, as can happen with normally allocated
- chunks, which means that even trimming via malloc_trim would not
- release them. However, it has the disadvantage that the space
- cannot be reclaimed, consolidated, and then used to service later
- requests, as happens with normal chunks. The advantages of mmap
- nearly always outweigh disadvantages for "large" chunks, but the
- value of "large" may vary across systems. The default is an
- empirically derived value that works well in most systems. You can
- disable mmap by setting to MAX_SIZE_T.
-
-*/
-
-#ifndef WIN32
-#ifdef _WIN32
-#define WIN32 1
-#endif /* _WIN32 */
-#endif /* WIN32 */
-#ifdef WIN32
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#define HAVE_MMAP 1
-#define HAVE_MORECORE 0
-#define LACKS_UNISTD_H
-#define LACKS_SYS_PARAM_H
-#define LACKS_SYS_MMAN_H
-#define LACKS_STRING_H
-#define LACKS_STRINGS_H
-#define LACKS_SYS_TYPES_H
-#define LACKS_ERRNO_H
-#define MALLOC_FAILURE_ACTION
-#define MMAP_CLEARS 0 /* WINCE and some others apparently don't clear */
-#endif /* WIN32 */
-
-#if defined(DARWIN) || defined(_DARWIN)
-/* Mac OSX docs advise not to use sbrk; it seems better to use mmap */
-#ifndef HAVE_MORECORE
-#define HAVE_MORECORE 0
-#define HAVE_MMAP 1
-#endif /* HAVE_MORECORE */
-#endif /* DARWIN */
-
-#ifndef LACKS_SYS_TYPES_H
-#include <sys/types.h> /* For size_t */
-#endif /* LACKS_SYS_TYPES_H */
-
-/* The maximum possible size_t value has all bits set */
-#define MAX_SIZE_T (~(size_t)0)
-
-#ifndef ONLY_MSPACES
-#define ONLY_MSPACES 0
-#endif /* ONLY_MSPACES */
-#ifndef MSPACES
-#if ONLY_MSPACES
-#define MSPACES 1
-#else /* ONLY_MSPACES */
-#define MSPACES 0
-#endif /* ONLY_MSPACES */
-#endif /* MSPACES */
-#ifndef MALLOC_ALIGNMENT
-#define MALLOC_ALIGNMENT ((size_t)8U)
-#endif /* MALLOC_ALIGNMENT */
-#ifndef FOOTERS
-#define FOOTERS 0
-#endif /* FOOTERS */
-#ifndef USE_MAX_ALLOWED_FOOTPRINT
-#define USE_MAX_ALLOWED_FOOTPRINT 0
-#endif
-#ifndef ABORT
-#define ABORT abort()
-#endif /* ABORT */
-#ifndef ABORT_ON_ASSERT_FAILURE
-#define ABORT_ON_ASSERT_FAILURE 1
-#endif /* ABORT_ON_ASSERT_FAILURE */
-#ifndef PROCEED_ON_ERROR
-#define PROCEED_ON_ERROR 0
-#endif /* PROCEED_ON_ERROR */
-#ifndef USE_LOCKS
-#define USE_LOCKS 0
-#endif /* USE_LOCKS */
-#ifndef INSECURE
-#define INSECURE 0
-#endif /* INSECURE */
-#ifndef HAVE_MMAP
-#define HAVE_MMAP 1
-#endif /* HAVE_MMAP */
-#ifndef MMAP_CLEARS
-#define MMAP_CLEARS 1
-#endif /* MMAP_CLEARS */
-#ifndef HAVE_MREMAP
-#ifdef linux
-#define HAVE_MREMAP 1
-#else /* linux */
-#define HAVE_MREMAP 0
-#endif /* linux */
-#endif /* HAVE_MREMAP */
-#ifndef MALLOC_FAILURE_ACTION
-#define MALLOC_FAILURE_ACTION errno = ENOMEM;
-#endif /* MALLOC_FAILURE_ACTION */
-#ifndef HAVE_MORECORE
-#if ONLY_MSPACES
-#define HAVE_MORECORE 0
-#else /* ONLY_MSPACES */
-#define HAVE_MORECORE 1
-#endif /* ONLY_MSPACES */
-#endif /* HAVE_MORECORE */
-#if !HAVE_MORECORE
-#define MORECORE_CONTIGUOUS 0
-#else /* !HAVE_MORECORE */
-#ifndef MORECORE
-#define MORECORE sbrk
-#endif /* MORECORE */
-#ifndef MORECORE_CONTIGUOUS
-#define MORECORE_CONTIGUOUS 1
-#endif /* MORECORE_CONTIGUOUS */
-#endif /* HAVE_MORECORE */
-#ifndef DEFAULT_GRANULARITY
-#if MORECORE_CONTIGUOUS
-#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */
-#else /* MORECORE_CONTIGUOUS */
-#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)
-#endif /* MORECORE_CONTIGUOUS */
-#endif /* DEFAULT_GRANULARITY */
-#ifndef DEFAULT_TRIM_THRESHOLD
-#ifndef MORECORE_CANNOT_TRIM
-#define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U)
-#else /* MORECORE_CANNOT_TRIM */
-#define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T
-#endif /* MORECORE_CANNOT_TRIM */
-#endif /* DEFAULT_TRIM_THRESHOLD */
-#ifndef DEFAULT_MMAP_THRESHOLD
-#if HAVE_MMAP
-#define DEFAULT_MMAP_THRESHOLD ((size_t)64U * (size_t)1024U)
-#else /* HAVE_MMAP */
-#define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T
-#endif /* HAVE_MMAP */
-#endif /* DEFAULT_MMAP_THRESHOLD */
-#ifndef USE_BUILTIN_FFS
-#define USE_BUILTIN_FFS 0
-#endif /* USE_BUILTIN_FFS */
-#ifndef USE_DEV_RANDOM
-#define USE_DEV_RANDOM 0
-#endif /* USE_DEV_RANDOM */
-#ifndef NO_MALLINFO
-#define NO_MALLINFO 0
-#endif /* NO_MALLINFO */
-#ifndef MALLINFO_FIELD_TYPE
-#define MALLINFO_FIELD_TYPE size_t
-#endif /* MALLINFO_FIELD_TYPE */
-
-/*
- mallopt tuning options. SVID/XPG defines four standard parameter
- numbers for mallopt, normally defined in malloc.h. None of these
- are used in this malloc, so setting them has no effect. But this
- malloc does support the following options.
-*/
-
-#define M_TRIM_THRESHOLD (-1)
-#define M_GRANULARITY (-2)
-#define M_MMAP_THRESHOLD (-3)
-
-/* ------------------------ Mallinfo declarations ------------------------ */
-
-#if !NO_MALLINFO
-/*
- This version of malloc supports the standard SVID/XPG mallinfo
- routine that returns a struct containing usage properties and
- statistics. It should work on any system that has a
- /usr/include/malloc.h defining struct mallinfo. The main
- declaration needed is the mallinfo struct that is returned (by-copy)
- by mallinfo(). The malloinfo struct contains a bunch of fields that
- are not even meaningful in this version of malloc. These fields are
- are instead filled by mallinfo() with other numbers that might be of
- interest.
-
- HAVE_USR_INCLUDE_MALLOC_H should be set if you have a
- /usr/include/malloc.h file that includes a declaration of struct
- mallinfo. If so, it is included; else a compliant version is
- declared below. These must be precisely the same for mallinfo() to
- work. The original SVID version of this struct, defined on most
- systems with mallinfo, declares all fields as ints. But some others
- define as unsigned long. If your system defines the fields using a
- type of different width than listed here, you MUST #include your
- system version and #define HAVE_USR_INCLUDE_MALLOC_H.
-*/
-
-/* #define HAVE_USR_INCLUDE_MALLOC_H */
-
-#if !ANDROID
-#ifdef HAVE_USR_INCLUDE_MALLOC_H
-#include "/usr/include/malloc.h"
-#else /* HAVE_USR_INCLUDE_MALLOC_H */
-
-struct mallinfo {
- MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
- MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
- MALLINFO_FIELD_TYPE smblks; /* always 0 */
- MALLINFO_FIELD_TYPE hblks; /* always 0 */
- MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
- MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
- MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
- MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
- MALLINFO_FIELD_TYPE fordblks; /* total free space */
- MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
-};
-
-#endif /* HAVE_USR_INCLUDE_MALLOC_H */
-#endif /* NO_MALLINFO */
-#endif /* ANDROID */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#if !ONLY_MSPACES
-
-/* ------------------- Declarations of public routines ------------------- */
-
-/* Check an additional macro for the five primary functions */
-#ifndef USE_DL_PREFIX
-#define dlcalloc calloc
-#define dlfree free
-#define dlmalloc malloc
-#define dlmemalign memalign
-#define dlrealloc realloc
-#endif
-
-#ifndef USE_DL_PREFIX
-#define dlvalloc valloc
-#define dlpvalloc pvalloc
-#define dlmallinfo mallinfo
-#define dlmallopt mallopt
-#define dlmalloc_trim malloc_trim
-#define dlmalloc_walk_free_pages \
- malloc_walk_free_pages
-#define dlmalloc_walk_heap \
- malloc_walk_heap
-#define dlmalloc_stats malloc_stats
-#define dlmalloc_usable_size malloc_usable_size
-#define dlmalloc_footprint malloc_footprint
-#define dlmalloc_max_allowed_footprint \
- malloc_max_allowed_footprint
-#define dlmalloc_set_max_allowed_footprint \
- malloc_set_max_allowed_footprint
-#define dlmalloc_max_footprint malloc_max_footprint
-#define dlindependent_calloc independent_calloc
-#define dlindependent_comalloc independent_comalloc
-#endif /* USE_DL_PREFIX */
-
-
-/*
- malloc(size_t n)
- Returns a pointer to a newly allocated chunk of at least n bytes, or
- null if no space is available, in which case errno is set to ENOMEM
- on ANSI C systems.
-
- If n is zero, malloc returns a minimum-sized chunk. (The minimum
- size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
- systems.) Note that size_t is an unsigned type, so calls with
- arguments that would be negative if signed are interpreted as
- requests for huge amounts of space, which will often fail. The
- maximum supported value of n differs across systems, but is in all
- cases less than the maximum representable value of a size_t.
-*/
-void* dlmalloc(size_t);
-
-/*
- free(void* p)
- Releases the chunk of memory pointed to by p, that had been previously
- allocated using malloc or a related routine such as realloc.
- It has no effect if p is null. If p was not malloced or already
- freed, free(p) will by default cause the current program to abort.
-*/
-void dlfree(void*);
-
-/*
- calloc(size_t n_elements, size_t element_size);
- Returns a pointer to n_elements * element_size bytes, with all locations
- set to zero.
-*/
-void* dlcalloc(size_t, size_t);
-
-/*
- realloc(void* p, size_t n)
- Returns a pointer to a chunk of size n that contains the same data
- as does chunk p up to the minimum of (n, p's size) bytes, or null
- if no space is available.
-
- The returned pointer may or may not be the same as p. The algorithm
- prefers extending p in most cases when possible, otherwise it
- employs the equivalent of a malloc-copy-free sequence.
-
- If p is null, realloc is equivalent to malloc.
-
- If space is not available, realloc returns null, errno is set (if on
- ANSI) and p is NOT freed.
-
- if n is for fewer bytes than already held by p, the newly unused
- space is lopped off and freed if possible. realloc with a size
- argument of zero (re)allocates a minimum-sized chunk.
-
- The old unix realloc convention of allowing the last-free'd chunk
- to be used as an argument to realloc is not supported.
-*/
-
-void* dlrealloc(void*, size_t);
-
-/*
- memalign(size_t alignment, size_t n);
- Returns a pointer to a newly allocated chunk of n bytes, aligned
- in accord with the alignment argument.
-
- The alignment argument should be a power of two. If the argument is
- not a power of two, the nearest greater power is used.
- 8-byte alignment is guaranteed by normal malloc calls, so don't
- bother calling memalign with an argument of 8 or less.
-
- Overreliance on memalign is a sure way to fragment space.
-*/
-void* dlmemalign(size_t, size_t);
-
-/*
- valloc(size_t n);
- Equivalent to memalign(pagesize, n), where pagesize is the page
- size of the system. If the pagesize is unknown, 4096 is used.
-*/
-void* dlvalloc(size_t);
-
-/*
- mallopt(int parameter_number, int parameter_value)
- Sets tunable parameters The format is to provide a
- (parameter-number, parameter-value) pair. mallopt then sets the
- corresponding parameter to the argument value if it can (i.e., so
- long as the value is meaningful), and returns 1 if successful else
- 0. SVID/XPG/ANSI defines four standard param numbers for mallopt,
- normally defined in malloc.h. None of these are use in this malloc,
- so setting them has no effect. But this malloc also supports other
- options in mallopt. See below for details. Briefly, supported
- parameters are as follows (listed defaults are for "typical"
- configurations).
-
- Symbol param # default allowed param values
- M_TRIM_THRESHOLD -1 2*1024*1024 any (MAX_SIZE_T disables)
- M_GRANULARITY -2 page size any power of 2 >= page size
- M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
-*/
-int dlmallopt(int, int);
-
-/*
- malloc_footprint();
- Returns the number of bytes obtained from the system. The total
- number of bytes allocated by malloc, realloc etc., is less than this
- value. Unlike mallinfo, this function returns only a precomputed
- result, so can be called frequently to monitor memory consumption.
- Even if locks are otherwise defined, this function does not use them,
- so results might not be up to date.
-*/
-size_t dlmalloc_footprint(void);
-
-#if USE_MAX_ALLOWED_FOOTPRINT
-/*
- malloc_max_allowed_footprint();
- Returns the number of bytes that the heap is allowed to obtain
- from the system. malloc_footprint() should always return a
- size less than or equal to max_allowed_footprint, unless the
- max_allowed_footprint was set to a value smaller than the
- footprint at the time.
-*/
-size_t dlmalloc_max_allowed_footprint();
-
-/*
- malloc_set_max_allowed_footprint();
- Set the maximum number of bytes that the heap is allowed to
- obtain from the system. The size will be rounded up to a whole
- page, and the rounded number will be returned from future calls
- to malloc_max_allowed_footprint(). If the new max_allowed_footprint
- is larger than the current footprint, the heap will never grow
- larger than max_allowed_footprint. If the new max_allowed_footprint
- is smaller than the current footprint, the heap will not grow
- further.
-
- TODO: try to force the heap to give up memory in the shrink case,
- and update this comment once that happens.
-*/
-void dlmalloc_set_max_allowed_footprint(size_t bytes);
-#endif /* USE_MAX_ALLOWED_FOOTPRINT */
-
-/*
- malloc_max_footprint();
- Returns the maximum number of bytes obtained from the system. This
- value will be greater than current footprint if deallocated space
- has been reclaimed by the system. The peak number of bytes allocated
- by malloc, realloc etc., is less than this value. Unlike mallinfo,
- this function returns only a precomputed result, so can be called
- frequently to monitor memory consumption. Even if locks are
- otherwise defined, this function does not use them, so results might
- not be up to date.
-*/
-size_t dlmalloc_max_footprint(void);
-
-#if !NO_MALLINFO
-/*
- mallinfo()
- Returns (by copy) a struct containing various summary statistics:
-
- arena: current total non-mmapped bytes allocated from system
- ordblks: the number of free chunks
- smblks: always zero.
- hblks: current number of mmapped regions
- hblkhd: total bytes held in mmapped regions
- usmblks: the maximum total allocated space. This will be greater
- than current total if trimming has occurred.
- fsmblks: always zero
- uordblks: current total allocated space (normal or mmapped)
- fordblks: total free space
- keepcost: the maximum number of bytes that could ideally be released
- back to system via malloc_trim. ("ideally" means that
- it ignores page restrictions etc.)
-
- Because these fields are ints, but internal bookkeeping may
- be kept as longs, the reported values may wrap around zero and
- thus be inaccurate.
-*/
-struct mallinfo dlmallinfo(void);
-#endif /* NO_MALLINFO */
-
-/*
- independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
-
- independent_calloc is similar to calloc, but instead of returning a
- single cleared space, it returns an array of pointers to n_elements
- independent elements that can hold contents of size elem_size, each
- of which starts out cleared, and can be independently freed,
- realloc'ed etc. The elements are guaranteed to be adjacently
- allocated (this is not guaranteed to occur with multiple callocs or
- mallocs), which may also improve cache locality in some
- applications.
-
- The "chunks" argument is optional (i.e., may be null, which is
- probably the most typical usage). If it is null, the returned array
- is itself dynamically allocated and should also be freed when it is
- no longer needed. Otherwise, the chunks array must be of at least
- n_elements in length. It is filled in with the pointers to the
- chunks.
-
- In either case, independent_calloc returns this pointer array, or
- null if the allocation failed. If n_elements is zero and "chunks"
- is null, it returns a chunk representing an array with zero elements
- (which should be freed if not wanted).
-
- Each element must be individually freed when it is no longer
- needed. If you'd like to instead be able to free all at once, you
- should instead use regular calloc and assign pointers into this
- space to represent elements. (In this case though, you cannot
- independently free elements.)
-
- independent_calloc simplifies and speeds up implementations of many
- kinds of pools. It may also be useful when constructing large data
- structures that initially have a fixed number of fixed-sized nodes,
- but the number is not known at compile time, and some of the nodes
- may later need to be freed. For example:
-
- struct Node { int item; struct Node* next; };
-
- struct Node* build_list() {
- struct Node** pool;
- int n = read_number_of_nodes_needed();
- if (n <= 0) return 0;
- pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
- if (pool == 0) die();
- // organize into a linked list...
- struct Node* first = pool[0];
- for (i = 0; i < n-1; ++i)
- pool[i]->next = pool[i+1];
- free(pool); // Can now free the array (or not, if it is needed later)
- return first;
- }
-*/
-void** dlindependent_calloc(size_t, size_t, void**);
-
-/*
- independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
-
- independent_comalloc allocates, all at once, a set of n_elements
- chunks with sizes indicated in the "sizes" array. It returns
- an array of pointers to these elements, each of which can be
- independently freed, realloc'ed etc. The elements are guaranteed to
- be adjacently allocated (this is not guaranteed to occur with
- multiple callocs or mallocs), which may also improve cache locality
- in some applications.
-
- The "chunks" argument is optional (i.e., may be null). If it is null
- the returned array is itself dynamically allocated and should also
- be freed when it is no longer needed. Otherwise, the chunks array
- must be of at least n_elements in length. It is filled in with the
- pointers to the chunks.
-
- In either case, independent_comalloc returns this pointer array, or
- null if the allocation failed. If n_elements is zero and chunks is
- null, it returns a chunk representing an array with zero elements
- (which should be freed if not wanted).
-
- Each element must be individually freed when it is no longer
- needed. If you'd like to instead be able to free all at once, you
- should instead use a single regular malloc, and assign pointers at
- particular offsets in the aggregate space. (In this case though, you
- cannot independently free elements.)
-
- independent_comallac differs from independent_calloc in that each
- element may have a different size, and also that it does not
- automatically clear elements.
-
- independent_comalloc can be used to speed up allocation in cases
- where several structs or objects must always be allocated at the
- same time. For example:
-
- struct Head { ... }
- struct Foot { ... }
-
- void send_message(char* msg) {
- int msglen = strlen(msg);
- size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
- void* chunks[3];
- if (independent_comalloc(3, sizes, chunks) == 0)
- die();
- struct Head* head = (struct Head*)(chunks[0]);
- char* body = (char*)(chunks[1]);
- struct Foot* foot = (struct Foot*)(chunks[2]);
- // ...
- }
-
- In general though, independent_comalloc is worth using only for
- larger values of n_elements. For small values, you probably won't
- detect enough difference from series of malloc calls to bother.
-
- Overuse of independent_comalloc can increase overall memory usage,
- since it cannot reuse existing noncontiguous small chunks that
- might be available for some of the elements.
-*/
-void** dlindependent_comalloc(size_t, size_t*, void**);
-
-
-/*
- pvalloc(size_t n);
- Equivalent to valloc(minimum-page-that-holds(n)), that is,
- round up n to nearest pagesize.
- */
-void* dlpvalloc(size_t);
-
-/*
- malloc_trim(size_t pad);
-
- If possible, gives memory back to the system (via negative arguments
- to sbrk) if there is unused memory at the `high' end of the malloc
- pool or in unused MMAP segments. You can call this after freeing
- large blocks of memory to potentially reduce the system-level memory
- requirements of a program. However, it cannot guarantee to reduce
- memory. Under some allocation patterns, some large free blocks of
- memory will be locked between two used chunks, so they cannot be
- given back to the system.
-
- The `pad' argument to malloc_trim represents the amount of free
- trailing space to leave untrimmed. If this argument is zero, only
- the minimum amount of memory to maintain internal data structures
- will be left. Non-zero arguments can be supplied to maintain enough
- trailing space to service future expected allocations without having
- to re-obtain memory from the system.
-
- Malloc_trim returns 1 if it actually released any memory, else 0.
-*/
-int dlmalloc_trim(size_t);
-
-/*
- malloc_walk_free_pages(handler, harg)
-
- Calls the provided handler on each free region in the heap. The
- memory between start and end are guaranteed not to contain any
- important data, so the handler is free to alter the contents
- in any way. This can be used to advise the OS that large free
- regions may be swapped out.
-
- The value in harg will be passed to each call of the handler.
- */
-void dlmalloc_walk_free_pages(void(*)(void*, void*, void*), void*);
-
-/*
- malloc_walk_heap(handler, harg)
-
- Calls the provided handler on each object or free region in the
- heap. The handler will receive the chunk pointer and length, the
- object pointer and length, and the value in harg on each call.
- */
-void dlmalloc_walk_heap(void(*)(const void*, size_t,
- const void*, size_t, void*),
- void*);
-
-/*
- malloc_usable_size(void* p);
-
- Returns the number of bytes you can actually use in
- an allocated chunk, which may be more than you requested (although
- often not) due to alignment and minimum size constraints.
- You can use this many bytes without worrying about
- overwriting other allocated objects. This is not a particularly great
- programming practice. malloc_usable_size can be more useful in
- debugging and assertions, for example:
-
- p = malloc(n);
- assert(malloc_usable_size(p) >= 256);
-*/
-size_t dlmalloc_usable_size(void*);
-
-/*
- malloc_stats();
- Prints on stderr the amount of space obtained from the system (both
- via sbrk and mmap), the maximum amount (which may be more than
- current if malloc_trim and/or munmap got called), and the current
- number of bytes allocated via malloc (or realloc, etc) but not yet
- freed. Note that this is the number of bytes allocated, not the
- number requested. It will be larger than the number requested
- because of alignment and bookkeeping overhead. Because it includes
- alignment wastage as being in use, this figure may be greater than
- zero even when no user-level chunks are allocated.
-
- The reported current and maximum system memory can be inaccurate if
- a program makes other calls to system memory allocation functions
- (normally sbrk) outside of malloc.
-
- malloc_stats prints only the most commonly interesting statistics.
- More information can be obtained by calling mallinfo.
-*/
-void dlmalloc_stats(void);
-
-#endif /* ONLY_MSPACES */
-
-#if MSPACES
-
-/*
- mspace is an opaque type representing an independent
- region of space that supports mspace_malloc, etc.
-*/
-typedef void* mspace;
-
-/*
- create_mspace creates and returns a new independent space with the
- given initial capacity, or, if 0, the default granularity size. It
- returns null if there is no system memory available to create the
- space. If argument locked is non-zero, the space uses a separate
- lock to control access. The capacity of the space will grow
- dynamically as needed to service mspace_malloc requests. You can
- control the sizes of incremental increases of this space by
- compiling with a different DEFAULT_GRANULARITY or dynamically
- setting with mallopt(M_GRANULARITY, value).
-*/
-mspace create_mspace(size_t capacity, int locked);
-
-/*
- destroy_mspace destroys the given space, and attempts to return all
- of its memory back to the system, returning the total number of
- bytes freed. After destruction, the results of access to all memory
- used by the space become undefined.
-*/
-size_t destroy_mspace(mspace msp);
-
-/*
- create_mspace_with_base uses the memory supplied as the initial base
- of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
- space is used for bookkeeping, so the capacity must be at least this
- large. (Otherwise 0 is returned.) When this initial space is
- exhausted, additional memory will be obtained from the system.
- Destroying this space will deallocate all additionally allocated
- space (if possible) but not the initial base.
-*/
-mspace create_mspace_with_base(void* base, size_t capacity, int locked);
-
-/*
- mspace_malloc behaves as malloc, but operates within
- the given space.
-*/
-void* mspace_malloc(mspace msp, size_t bytes);
-
-/*
- mspace_free behaves as free, but operates within
- the given space.
-
- If compiled with FOOTERS==1, mspace_free is not actually needed.
- free may be called instead of mspace_free because freed chunks from
- any space are handled by their originating spaces.
-*/
-void mspace_free(mspace msp, void* mem);
-
-/*
- mspace_realloc behaves as realloc, but operates within
- the given space.
-
- If compiled with FOOTERS==1, mspace_realloc is not actually
- needed. realloc may be called instead of mspace_realloc because
- realloced chunks from any space are handled by their originating
- spaces.
-*/
-void* mspace_realloc(mspace msp, void* mem, size_t newsize);
-
-#if ANDROID /* Added for Android, not part of dlmalloc as released */
-/*
- mspace_merge_objects will merge allocated memory mema and memb
- together, provided memb immediately follows mema. It is roughly as
- if memb has been freed and mema has been realloced to a larger size.
- On successfully merging, mema will be returned. If either argument
- is null or memb does not immediately follow mema, null will be
- returned.
-
- Both mema and memb should have been previously allocated using
- malloc or a related routine such as realloc. If either mema or memb
- was not malloced or was previously freed, the result is undefined,
- but like mspace_free, the default is to abort the program.
-*/
-void* mspace_merge_objects(mspace msp, void* mema, void* memb);
-#endif
-
-/*
- mspace_calloc behaves as calloc, but operates within
- the given space.
-*/
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
-
-/*
- mspace_memalign behaves as memalign, but operates within
- the given space.
-*/
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
-
-/*
- mspace_independent_calloc behaves as independent_calloc, but
- operates within the given space.
-*/
-void** mspace_independent_calloc(mspace msp, size_t n_elements,
- size_t elem_size, void* chunks[]);
-
-/*
- mspace_independent_comalloc behaves as independent_comalloc, but
- operates within the given space.
-*/
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,
- size_t sizes[], void* chunks[]);
-
-/*
- mspace_footprint() returns the number of bytes obtained from the
- system for this space.
-*/
-size_t mspace_footprint(mspace msp);
-
-/*
- mspace_max_footprint() returns the peak number of bytes obtained from the
- system for this space.
-*/
-size_t mspace_max_footprint(mspace msp);
-
-
-#if !NO_MALLINFO
-/*
- mspace_mallinfo behaves as mallinfo, but reports properties of
- the given space.
-*/
-struct mallinfo mspace_mallinfo(mspace msp);
-#endif /* NO_MALLINFO */
-
-/*
- mspace_malloc_stats behaves as malloc_stats, but reports
- properties of the given space.
-*/
-void mspace_malloc_stats(mspace msp);
-
-/*
- mspace_trim behaves as malloc_trim, but
- operates within the given space.
-*/
-int mspace_trim(mspace msp, size_t pad);
-
-/*
- An alias for mallopt.
-*/
-int mspace_mallopt(int, int);
-
-#endif /* MSPACES */
-
-#ifdef __cplusplus
-}; /* end of extern "C" */
-#endif /* __cplusplus */
-
-/*
- ========================================================================
- To make a fully customizable malloc.h header file, cut everything
- above this line, put into file malloc.h, edit to suit, and #include it
- on the next line, as well as in programs that use this malloc.
- ========================================================================
-*/
-
-/* #include "malloc.h" */
-
-/*------------------------------ internal #includes ---------------------- */
-
-#ifdef WIN32
-#pragma warning( disable : 4146 ) /* no "unsigned" warnings */
-#endif /* WIN32 */
-
-#include <stdio.h> /* for printing in malloc_stats */
-
-#ifndef LACKS_ERRNO_H
-#include <errno.h> /* for MALLOC_FAILURE_ACTION */
-#endif /* LACKS_ERRNO_H */
-#if FOOTERS
-#include <time.h> /* for magic initialization */
-#endif /* FOOTERS */
-#ifndef LACKS_STDLIB_H
-#include <stdlib.h> /* for abort() */
-#endif /* LACKS_STDLIB_H */
-#ifdef DEBUG
-#if ABORT_ON_ASSERT_FAILURE
-#define assert(x) if(!(x)) ABORT
-#else /* ABORT_ON_ASSERT_FAILURE */
-#include <assert.h>
-#endif /* ABORT_ON_ASSERT_FAILURE */
-#else /* DEBUG */
-#define assert(x)
-#endif /* DEBUG */
-#ifndef LACKS_STRING_H
-#include <string.h> /* for memset etc */
-#endif /* LACKS_STRING_H */
-#if USE_BUILTIN_FFS
-#ifndef LACKS_STRINGS_H
-#include <strings.h> /* for ffs */
-#endif /* LACKS_STRINGS_H */
-#endif /* USE_BUILTIN_FFS */
-#if HAVE_MMAP
-#ifndef LACKS_SYS_MMAN_H
-#include <sys/mman.h> /* for mmap */
-#endif /* LACKS_SYS_MMAN_H */
-#ifndef LACKS_FCNTL_H
-#include <fcntl.h>
-#endif /* LACKS_FCNTL_H */
-#endif /* HAVE_MMAP */
-#if HAVE_MORECORE
-#ifndef LACKS_UNISTD_H
-#include <unistd.h> /* for sbrk */
-#else /* LACKS_UNISTD_H */
-#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
-extern void* sbrk(ptrdiff_t);
-#endif /* FreeBSD etc */
-#endif /* LACKS_UNISTD_H */
-#endif /* HAVE_MMAP */
-
-#ifndef WIN32
-#ifndef malloc_getpagesize
-# ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */
-# ifndef _SC_PAGE_SIZE
-# define _SC_PAGE_SIZE _SC_PAGESIZE
-# endif
-# endif
-# ifdef _SC_PAGE_SIZE
-# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
-# else
-# if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)
- extern size_t getpagesize();
-# define malloc_getpagesize getpagesize()
-# else
-# ifdef WIN32 /* use supplied emulation of getpagesize */
-# define malloc_getpagesize getpagesize()
-# else
-# ifndef LACKS_SYS_PARAM_H
-# include <sys/param.h>
-# endif
-# ifdef EXEC_PAGESIZE
-# define malloc_getpagesize EXEC_PAGESIZE
-# else
-# ifdef NBPG
-# ifndef CLSIZE
-# define malloc_getpagesize NBPG
-# else
-# define malloc_getpagesize (NBPG * CLSIZE)
-# endif
-# else
-# ifdef NBPC
-# define malloc_getpagesize NBPC
-# else
-# ifdef PAGESIZE
-# define malloc_getpagesize PAGESIZE
-# else /* just guess */
-# define malloc_getpagesize ((size_t)4096U)
-# endif
-# endif
-# endif
-# endif
-# endif
-# endif
-# endif
-#endif
-#endif
-
-/* ------------------- size_t and alignment properties -------------------- */
-
-/* The byte and bit size of a size_t */
-#define SIZE_T_SIZE (sizeof(size_t))
-#define SIZE_T_BITSIZE (sizeof(size_t) << 3)
-
-/* Some constants coerced to size_t */
-/* Annoying but necessary to avoid errors on some plaftorms */
-#define SIZE_T_ZERO ((size_t)0)
-#define SIZE_T_ONE ((size_t)1)
-#define SIZE_T_TWO ((size_t)2)
-#define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1)
-#define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2)
-#define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES)
-#define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U)
-
-/* The bit mask value corresponding to MALLOC_ALIGNMENT */
-#define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE)
-
-/* True if address a has acceptable alignment */
-#define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0)
-
-/* the number of bytes to offset an address to align it */
-#define align_offset(A)\
- ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\
- ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))
-
-/* -------------------------- MMAP preliminaries ------------------------- */
-
-/*
- If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and
- checks to fail so compiler optimizer can delete code rather than
- using so many "#if"s.
-*/
-
-
-/* MORECORE and MMAP must return MFAIL on failure */
-#define MFAIL ((void*)(MAX_SIZE_T))
-#define CMFAIL ((char*)(MFAIL)) /* defined for convenience */
-
-#if !HAVE_MMAP
-#define IS_MMAPPED_BIT (SIZE_T_ZERO)
-#define USE_MMAP_BIT (SIZE_T_ZERO)
-#define CALL_MMAP(s) MFAIL
-#define CALL_MUNMAP(a, s) (-1)
-#define DIRECT_MMAP(s) MFAIL
-
-#else /* HAVE_MMAP */
-#define IS_MMAPPED_BIT (SIZE_T_ONE)
-#define USE_MMAP_BIT (SIZE_T_ONE)
-
-#ifndef WIN32
-#define CALL_MUNMAP(a, s) munmap((a), (s))
-#define MMAP_PROT (PROT_READ|PROT_WRITE)
-#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
-#define MAP_ANONYMOUS MAP_ANON
-#endif /* MAP_ANON */
-#ifdef MAP_ANONYMOUS
-#define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS)
-#define CALL_MMAP(s) mmap(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0)
-#else /* MAP_ANONYMOUS */
-/*
- Nearly all versions of mmap support MAP_ANONYMOUS, so the following
- is unlikely to be needed, but is supplied just in case.
-*/
-#define MMAP_FLAGS (MAP_PRIVATE)
-static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */
-#define CALL_MMAP(s) ((dev_zero_fd < 0) ? \
- (dev_zero_fd = open("/dev/zero", O_RDWR), \
- mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \
- mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0))
-#endif /* MAP_ANONYMOUS */
-
-#define DIRECT_MMAP(s) CALL_MMAP(s)
-#else /* WIN32 */
-
-/* Win32 MMAP via VirtualAlloc */
-static void* win32mmap(size_t size) {
- void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
- return (ptr != 0)? ptr: MFAIL;
-}
-
-/* For direct MMAP, use MEM_TOP_DOWN to minimize interference */
-static void* win32direct_mmap(size_t size) {
- void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
- PAGE_READWRITE);
- return (ptr != 0)? ptr: MFAIL;
-}
-
-/* This function supports releasing coalesed segments */
-static int win32munmap(void* ptr, size_t size) {
- MEMORY_BASIC_INFORMATION minfo;
- char* cptr = ptr;
- while (size) {
- if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0)
- return -1;
- if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr ||
- minfo.State != MEM_COMMIT || minfo.RegionSize > size)
- return -1;
- if (VirtualFree(cptr, 0, MEM_RELEASE) == 0)
- return -1;
- cptr += minfo.RegionSize;
- size -= minfo.RegionSize;
- }
- return 0;
-}
-
-#define CALL_MMAP(s) win32mmap(s)
-#define CALL_MUNMAP(a, s) win32munmap((a), (s))
-#define DIRECT_MMAP(s) win32direct_mmap(s)
-#endif /* WIN32 */
-#endif /* HAVE_MMAP */
-
-#if HAVE_MMAP && HAVE_MREMAP
-#define CALL_MREMAP(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))
-#else /* HAVE_MMAP && HAVE_MREMAP */
-#define CALL_MREMAP(addr, osz, nsz, mv) MFAIL
-#endif /* HAVE_MMAP && HAVE_MREMAP */
-
-#if HAVE_MORECORE
-#define CALL_MORECORE(S) MORECORE(S)
-#else /* HAVE_MORECORE */
-#define CALL_MORECORE(S) MFAIL
-#endif /* HAVE_MORECORE */
-
-/* mstate bit set if continguous morecore disabled or failed */
-#define USE_NONCONTIGUOUS_BIT (4U)
-
-/* segment bit set in create_mspace_with_base */
-#define EXTERN_BIT (8U)
-
-
-/* --------------------------- Lock preliminaries ------------------------ */
-
-#if USE_LOCKS
-
-/*
- When locks are defined, there are up to two global locks:
-
- * If HAVE_MORECORE, morecore_mutex protects sequences of calls to
- MORECORE. In many cases sys_alloc requires two calls, that should
- not be interleaved with calls by other threads. This does not
- protect against direct calls to MORECORE by other threads not
- using this lock, so there is still code to cope the best we can on
- interference.
-
- * magic_init_mutex ensures that mparams.magic and other
- unique mparams values are initialized only once.
-*/
-
-#ifndef WIN32
-/* By default use posix locks */
-#include <pthread.h>
-#define MLOCK_T pthread_mutex_t
-#define INITIAL_LOCK(l) pthread_mutex_init(l, NULL)
-#define ACQUIRE_LOCK(l) pthread_mutex_lock(l)
-#define RELEASE_LOCK(l) pthread_mutex_unlock(l)
-
-#if HAVE_MORECORE
-static MLOCK_T morecore_mutex = PTHREAD_MUTEX_INITIALIZER;
-#endif /* HAVE_MORECORE */
-
-static MLOCK_T magic_init_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-#else /* WIN32 */
-/*
- Because lock-protected regions have bounded times, and there
- are no recursive lock calls, we can use simple spinlocks.
-*/
-
-#define MLOCK_T long
-static int win32_acquire_lock (MLOCK_T *sl) {
- for (;;) {
-#ifdef InterlockedCompareExchangePointer
- if (!InterlockedCompareExchange(sl, 1, 0))
- return 0;
-#else /* Use older void* version */
- if (!InterlockedCompareExchange((void**)sl, (void*)1, (void*)0))
- return 0;
-#endif /* InterlockedCompareExchangePointer */
- Sleep (0);
- }
-}
-
-static void win32_release_lock (MLOCK_T *sl) {
- InterlockedExchange (sl, 0);
-}
-
-#define INITIAL_LOCK(l) *(l)=0
-#define ACQUIRE_LOCK(l) win32_acquire_lock(l)
-#define RELEASE_LOCK(l) win32_release_lock(l)
-#if HAVE_MORECORE
-static MLOCK_T morecore_mutex;
-#endif /* HAVE_MORECORE */
-static MLOCK_T magic_init_mutex;
-#endif /* WIN32 */
-
-#define USE_LOCK_BIT (2U)
-#else /* USE_LOCKS */
-#define USE_LOCK_BIT (0U)
-#define INITIAL_LOCK(l)
-#endif /* USE_LOCKS */
-
-#if USE_LOCKS && HAVE_MORECORE
-#define ACQUIRE_MORECORE_LOCK() ACQUIRE_LOCK(&morecore_mutex);
-#define RELEASE_MORECORE_LOCK() RELEASE_LOCK(&morecore_mutex);
-#else /* USE_LOCKS && HAVE_MORECORE */
-#define ACQUIRE_MORECORE_LOCK()
-#define RELEASE_MORECORE_LOCK()
-#endif /* USE_LOCKS && HAVE_MORECORE */
-
-#if USE_LOCKS
-#define ACQUIRE_MAGIC_INIT_LOCK() ACQUIRE_LOCK(&magic_init_mutex);
-#define RELEASE_MAGIC_INIT_LOCK() RELEASE_LOCK(&magic_init_mutex);
-#else /* USE_LOCKS */
-#define ACQUIRE_MAGIC_INIT_LOCK()
-#define RELEASE_MAGIC_INIT_LOCK()
-#endif /* USE_LOCKS */
-
-
-/* ----------------------- Chunk representations ------------------------ */
-
-/*
- (The following includes lightly edited explanations by Colin Plumb.)
-
- The malloc_chunk declaration below is misleading (but accurate and
- necessary). It declares a "view" into memory allowing access to
- necessary fields at known offsets from a given base.
-
- Chunks of memory are maintained using a `boundary tag' method as
- originally described by Knuth. (See the paper by Paul Wilson
- ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such
- techniques.) Sizes of free chunks are stored both in the front of
- each chunk and at the end. This makes consolidating fragmented
- chunks into bigger chunks fast. The head fields also hold bits
- representing whether chunks are free or in use.
-
- Here are some pictures to make it clearer. They are "exploded" to
- show that the state of a chunk can be thought of as extending from
- the high 31 bits of the head field of its header through the
- prev_foot and PINUSE_BIT bit of the following chunk header.
-
- A chunk that's in use looks like:
-
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Size of previous chunk (if P = 1) |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
- | Size of this chunk 1| +-+
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | |
- +- -+
- | |
- +- -+
- | :
- +- size - sizeof(size_t) available payload bytes -+
- : |
- chunk-> +- -+
- | |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|
- | Size of next chunk (may or may not be in use) | +-+
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-
- And if it's free, it looks like this:
-
- chunk-> +- -+
- | User payload (must be in use, or we would have merged!) |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
- | Size of this chunk 0| +-+
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Next pointer |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Prev pointer |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | :
- +- size - sizeof(struct chunk) unused bytes -+
- : |
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Size of this chunk |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|
- | Size of next chunk (must be in use, or we would have merged)| +-+
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | :
- +- User payload -+
- : |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- |0|
- +-+
- Note that since we always merge adjacent free chunks, the chunks
- adjacent to a free chunk must be in use.
-
- Given a pointer to a chunk (which can be derived trivially from the
- payload pointer) we can, in O(1) time, find out whether the adjacent
- chunks are free, and if so, unlink them from the lists that they
- are on and merge them with the current chunk.
-
- Chunks always begin on even word boundaries, so the mem portion
- (which is returned to the user) is also on an even word boundary, and
- thus at least double-word aligned.
-
- The P (PINUSE_BIT) bit, stored in the unused low-order bit of the
- chunk size (which is always a multiple of two words), is an in-use
- bit for the *previous* chunk. If that bit is *clear*, then the
- word before the current chunk size contains the previous chunk
- size, and can be used to find the front of the previous chunk.
- The very first chunk allocated always has this bit set, preventing
- access to non-existent (or non-owned) memory. If pinuse is set for
- any given chunk, then you CANNOT determine the size of the
- previous chunk, and might even get a memory addressing fault when
- trying to do so.
-
- The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of
- the chunk size redundantly records whether the current chunk is
- inuse. This redundancy enables usage checks within free and realloc,
- and reduces indirection when freeing and consolidating chunks.
-
- Each freshly allocated chunk must have both cinuse and pinuse set.
- That is, each allocated chunk borders either a previously allocated
- and still in-use chunk, or the base of its memory arena. This is
- ensured by making all allocations from the the `lowest' part of any
- found chunk. Further, no free chunk physically borders another one,
- so each free chunk is known to be preceded and followed by either
- inuse chunks or the ends of memory.
-
- Note that the `foot' of the current chunk is actually represented
- as the prev_foot of the NEXT chunk. This makes it easier to
- deal with alignments etc but can be very confusing when trying
- to extend or adapt this code.
-
- The exceptions to all this are
-
- 1. The special chunk `top' is the top-most available chunk (i.e.,
- the one bordering the end of available memory). It is treated
- specially. Top is never included in any bin, is used only if
- no other chunk is available, and is released back to the
- system if it is very large (see M_TRIM_THRESHOLD). In effect,
- the top chunk is treated as larger (and thus less well
- fitting) than any other available chunk. The top chunk
- doesn't update its trailing size field since there is no next
- contiguous chunk that would have to index off it. However,
- space is still allocated for it (TOP_FOOT_SIZE) to enable
- separation or merging when space is extended.
-
- 3. Chunks allocated via mmap, which have the lowest-order bit
- (IS_MMAPPED_BIT) set in their prev_foot fields, and do not set
- PINUSE_BIT in their head fields. Because they are allocated
- one-by-one, each must carry its own prev_foot field, which is
- also used to hold the offset this chunk has within its mmapped
- region, which is needed to preserve alignment. Each mmapped
- chunk is trailed by the first two fields of a fake next-chunk
- for sake of usage checks.
-
-*/
-
-struct malloc_chunk {
- size_t prev_foot; /* Size of previous chunk (if free). */
- size_t head; /* Size and inuse bits. */
- struct malloc_chunk* fd; /* double links -- used only if free. */
- struct malloc_chunk* bk;
-};
-
-typedef struct malloc_chunk mchunk;
-typedef struct malloc_chunk* mchunkptr;
-typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */
-typedef unsigned int bindex_t; /* Described below */
-typedef unsigned int binmap_t; /* Described below */
-typedef unsigned int flag_t; /* The type of various bit flag sets */
-
-/* ------------------- Chunks sizes and alignments ----------------------- */
-
-#define MCHUNK_SIZE (sizeof(mchunk))
-
-#if FOOTERS
-#define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
-#else /* FOOTERS */
-#define CHUNK_OVERHEAD (SIZE_T_SIZE)
-#endif /* FOOTERS */
-
-/* MMapped chunks need a second word of overhead ... */
-#define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
-/* ... and additional padding for fake next-chunk at foot */
-#define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES)
-
-/* The smallest size we can malloc is an aligned minimal chunk */
-#define MIN_CHUNK_SIZE\
- ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
-
-/* conversion from malloc headers to user pointers, and back */
-#define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES))
-#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES))
-/* chunk associated with aligned address A */
-#define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A)))
-
-/* Bounds on request (not chunk) sizes. */
-#define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2)
-#define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE)
-
-/* pad request bytes into a usable size */
-#define pad_request(req) \
- (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
-
-/* pad request, checking for minimum (but not maximum) */
-#define request2size(req) \
- (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req))
-
-
-/* ------------------ Operations on head and foot fields ----------------- */
-
-/*
- The head field of a chunk is or'ed with PINUSE_BIT when previous
- adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in
- use. If the chunk was obtained with mmap, the prev_foot field has
- IS_MMAPPED_BIT set, otherwise holding the offset of the base of the
- mmapped region to the base of the chunk.
-*/
-
-#define PINUSE_BIT (SIZE_T_ONE)
-#define CINUSE_BIT (SIZE_T_TWO)
-#define INUSE_BITS (PINUSE_BIT|CINUSE_BIT)
-
-/* Head value for fenceposts */
-#define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE)
-
-/* extraction of fields from head words */
-#define cinuse(p) ((p)->head & CINUSE_BIT)
-#define pinuse(p) ((p)->head & PINUSE_BIT)
-#define chunksize(p) ((p)->head & ~(INUSE_BITS))
-
-#define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT)
-#define clear_cinuse(p) ((p)->head &= ~CINUSE_BIT)
-
-/* Treat space at ptr +/- offset as a chunk */
-#define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))
-#define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s)))
-
-/* Ptr to next or previous physical malloc_chunk. */
-#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~INUSE_BITS)))
-#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))
-
-/* extract next chunk's pinuse bit */
-#define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT)
-
-/* Get/set size at footer */
-#define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot)
-#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))
-
-/* Set size, pinuse bit, and foot */
-#define set_size_and_pinuse_of_free_chunk(p, s)\
- ((p)->head = (s|PINUSE_BIT), set_foot(p, s))
-
-/* Set size, pinuse bit, foot, and clear next pinuse */
-#define set_free_with_pinuse(p, s, n)\
- (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s))
-
-#define is_mmapped(p)\
- (!((p)->head & PINUSE_BIT) && ((p)->prev_foot & IS_MMAPPED_BIT))
-
-/* Get the internal overhead associated with chunk p */
-#define overhead_for(p)\
- (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD)
-
-/* Return true if malloced space is not necessarily cleared */
-#if MMAP_CLEARS
-#define calloc_must_clear(p) (!is_mmapped(p))
-#else /* MMAP_CLEARS */
-#define calloc_must_clear(p) (1)
-#endif /* MMAP_CLEARS */
-
-/* ---------------------- Overlaid data structures ----------------------- */
-
-/*
- When chunks are not in use, they are treated as nodes of either
- lists or trees.
-
- "Small" chunks are stored in circular doubly-linked lists, and look
- like this:
-
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Size of previous chunk |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- `head:' | Size of chunk, in bytes |P|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Forward pointer to next chunk in list |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Back pointer to previous chunk in list |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Unused space (may be 0 bytes long) .
- . .
- . |
-nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- `foot:' | Size of chunk, in bytes |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-
- Larger chunks are kept in a form of bitwise digital trees (aka
- tries) keyed on chunksizes. Because malloc_tree_chunks are only for
- free chunks greater than 256 bytes, their size doesn't impose any
- constraints on user chunk sizes. Each node looks like:
-
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Size of previous chunk |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- `head:' | Size of chunk, in bytes |P|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Forward pointer to next chunk of same size |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Back pointer to previous chunk of same size |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Pointer to left child (child[0]) |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Pointer to right child (child[1]) |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Pointer to parent |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | bin index of this chunk |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Unused space .
- . |
-nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- `foot:' | Size of chunk, in bytes |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-
- Each tree holding treenodes is a tree of unique chunk sizes. Chunks
- of the same size are arranged in a circularly-linked list, with only
- the oldest chunk (the next to be used, in our FIFO ordering)
- actually in the tree. (Tree members are distinguished by a non-null
- parent pointer.) If a chunk with the same size an an existing node
- is inserted, it is linked off the existing node using pointers that
- work in the same way as fd/bk pointers of small chunks.
-
- Each tree contains a power of 2 sized range of chunk sizes (the
- smallest is 0x100 <= x < 0x180), which is is divided in half at each
- tree level, with the chunks in the smaller half of the range (0x100
- <= x < 0x140 for the top nose) in the left subtree and the larger
- half (0x140 <= x < 0x180) in the right subtree. This is, of course,
- done by inspecting individual bits.
-
- Using these rules, each node's left subtree contains all smaller
- sizes than its right subtree. However, the node at the root of each
- subtree has no particular ordering relationship to either. (The
- dividing line between the subtree sizes is based on trie relation.)
- If we remove the last chunk of a given size from the interior of the
- tree, we need to replace it with a leaf node. The tree ordering
- rules permit a node to be replaced by any leaf below it.
-
- The smallest chunk in a tree (a common operation in a best-fit
- allocator) can be found by walking a path to the leftmost leaf in
- the tree. Unlike a usual binary tree, where we follow left child
- pointers until we reach a null, here we follow the right child
- pointer any time the left one is null, until we reach a leaf with
- both child pointers null. The smallest chunk in the tree will be
- somewhere along that path.
-
- The worst case number of steps to add, find, or remove a node is
- bounded by the number of bits differentiating chunks within
- bins. Under current bin calculations, this ranges from 6 up to 21
- (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case
- is of course much better.
-*/
-
-struct malloc_tree_chunk {
- /* The first four fields must be compatible with malloc_chunk */
- size_t prev_foot;
- size_t head;
- struct malloc_tree_chunk* fd;
- struct malloc_tree_chunk* bk;
-
- struct malloc_tree_chunk* child[2];
- struct malloc_tree_chunk* parent;
- bindex_t index;
-};
-
-typedef struct malloc_tree_chunk tchunk;
-typedef struct malloc_tree_chunk* tchunkptr;
-typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */
-
-/* A little helper macro for trees */
-#define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1])
-
-/* ----------------------------- Segments -------------------------------- */
-
-/*
- Each malloc space may include non-contiguous segments, held in a
- list headed by an embedded malloc_segment record representing the
- top-most space. Segments also include flags holding properties of
- the space. Large chunks that are directly allocated by mmap are not
- included in this list. They are instead independently created and
- destroyed without otherwise keeping track of them.
-
- Segment management mainly comes into play for spaces allocated by
- MMAP. Any call to MMAP might or might not return memory that is
- adjacent to an existing segment. MORECORE normally contiguously
- extends the current space, so this space is almost always adjacent,
- which is simpler and faster to deal with. (This is why MORECORE is
- used preferentially to MMAP when both are available -- see
- sys_alloc.) When allocating using MMAP, we don't use any of the
- hinting mechanisms (inconsistently) supported in various
- implementations of unix mmap, or distinguish reserving from
- committing memory. Instead, we just ask for space, and exploit
- contiguity when we get it. It is probably possible to do
- better than this on some systems, but no general scheme seems
- to be significantly better.
-
- Management entails a simpler variant of the consolidation scheme
- used for chunks to reduce fragmentation -- new adjacent memory is
- normally prepended or appended to an existing segment. However,
- there are limitations compared to chunk consolidation that mostly
- reflect the fact that segment processing is relatively infrequent
- (occurring only when getting memory from system) and that we
- don't expect to have huge numbers of segments:
-
- * Segments are not indexed, so traversal requires linear scans. (It
- would be possible to index these, but is not worth the extra
- overhead and complexity for most programs on most platforms.)
- * New segments are only appended to old ones when holding top-most
- memory; if they cannot be prepended to others, they are held in
- different segments.
-
- Except for the top-most segment of an mstate, each segment record
- is kept at the tail of its segment. Segments are added by pushing
- segment records onto the list headed by &mstate.seg for the
- containing mstate.
-
- Segment flags control allocation/merge/deallocation policies:
- * If EXTERN_BIT set, then we did not allocate this segment,
- and so should not try to deallocate or merge with others.
- (This currently holds only for the initial segment passed
- into create_mspace_with_base.)
- * If IS_MMAPPED_BIT set, the segment may be merged with
- other surrounding mmapped segments and trimmed/de-allocated
- using munmap.
- * If neither bit is set, then the segment was obtained using
- MORECORE so can be merged with surrounding MORECORE'd segments
- and deallocated/trimmed using MORECORE with negative arguments.
-*/
-
-struct malloc_segment {
- char* base; /* base address */
- size_t size; /* allocated size */
- struct malloc_segment* next; /* ptr to next segment */
- flag_t sflags; /* mmap and extern flag */
-};
-
-#define is_mmapped_segment(S) ((S)->sflags & IS_MMAPPED_BIT)
-#define is_extern_segment(S) ((S)->sflags & EXTERN_BIT)
-
-typedef struct malloc_segment msegment;
-typedef struct malloc_segment* msegmentptr;
-
-/* ---------------------------- malloc_state ----------------------------- */
-
-/*
- A malloc_state holds all of the bookkeeping for a space.
- The main fields are:
-
- Top
- The topmost chunk of the currently active segment. Its size is
- cached in topsize. The actual size of topmost space is
- topsize+TOP_FOOT_SIZE, which includes space reserved for adding
- fenceposts and segment records if necessary when getting more
- space from the system. The size at which to autotrim top is
- cached from mparams in trim_check, except that it is disabled if
- an autotrim fails.
-
- Designated victim (dv)
- This is the preferred chunk for servicing small requests that
- don't have exact fits. It is normally the chunk split off most
- recently to service another small request. Its size is cached in
- dvsize. The link fields of this chunk are not maintained since it
- is not kept in a bin.
-
- SmallBins
- An array of bin headers for free chunks. These bins hold chunks
- with sizes less than MIN_LARGE_SIZE bytes. Each bin contains
- chunks of all the same size, spaced 8 bytes apart. To simplify
- use in double-linked lists, each bin header acts as a malloc_chunk
- pointing to the real first node, if it exists (else pointing to
- itself). This avoids special-casing for headers. But to avoid
- waste, we allocate only the fd/bk pointers of bins, and then use
- repositioning tricks to treat these as the fields of a chunk.
-
- TreeBins
- Treebins are pointers to the roots of trees holding a range of
- sizes. There are 2 equally spaced treebins for each power of two
- from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything
- larger.
-
- Bin maps
- There is one bit map for small bins ("smallmap") and one for
- treebins ("treemap). Each bin sets its bit when non-empty, and
- clears the bit when empty. Bit operations are then used to avoid
- bin-by-bin searching -- nearly all "search" is done without ever
- looking at bins that won't be selected. The bit maps
- conservatively use 32 bits per map word, even if on 64bit system.
- For a good description of some of the bit-based techniques used
- here, see Henry S. Warren Jr's book "Hacker's Delight" (and
- supplement at http://hackersdelight.org/). Many of these are
- intended to reduce the branchiness of paths through malloc etc, as
- well as to reduce the number of memory locations read or written.
-
- Segments
- A list of segments headed by an embedded malloc_segment record
- representing the initial space.
-
- Address check support
- The least_addr field is the least address ever obtained from
- MORECORE or MMAP. Attempted frees and reallocs of any address less
- than this are trapped (unless INSECURE is defined).
-
- Magic tag
- A cross-check field that should always hold same value as mparams.magic.
-
- Flags
- Bits recording whether to use MMAP, locks, or contiguous MORECORE
-
- Statistics
- Each space keeps track of current and maximum system memory
- obtained via MORECORE or MMAP.
-
- Locking
- If USE_LOCKS is defined, the "mutex" lock is acquired and released
- around every public call using this mspace.
-*/
-
-/* Bin types, widths and sizes */
-#define NSMALLBINS (32U)
-#define NTREEBINS (32U)
-#define SMALLBIN_SHIFT (3U)
-#define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT)
-#define TREEBIN_SHIFT (8U)
-#define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT)
-#define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE)
-#define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD)
-
-struct malloc_state {
- binmap_t smallmap;
- binmap_t treemap;
- size_t dvsize;
- size_t topsize;
- char* least_addr;
- mchunkptr dv;
- mchunkptr top;
- size_t trim_check;
- size_t magic;
- mchunkptr smallbins[(NSMALLBINS+1)*2];
- tbinptr treebins[NTREEBINS];
- size_t footprint;
-#if USE_MAX_ALLOWED_FOOTPRINT
- size_t max_allowed_footprint;
-#endif
- size_t max_footprint;
- flag_t mflags;
-#if USE_LOCKS
- MLOCK_T mutex; /* locate lock among fields that rarely change */
-#endif /* USE_LOCKS */
- msegment seg;
-};
-
-typedef struct malloc_state* mstate;
-
-/* ------------- Global malloc_state and malloc_params ------------------- */
-
-/*
- malloc_params holds global properties, including those that can be
- dynamically set using mallopt. There is a single instance, mparams,
- initialized in init_mparams.
-*/
-
-struct malloc_params {
- size_t magic;
- size_t page_size;
- size_t granularity;
- size_t mmap_threshold;
- size_t trim_threshold;
- flag_t default_mflags;
-};
-
-static struct malloc_params mparams;
-
-/* The global malloc_state used for all non-"mspace" calls */
-static struct malloc_state _gm_
-#if USE_MAX_ALLOWED_FOOTPRINT
- = { .max_allowed_footprint = MAX_SIZE_T };
-#else
- ;
-#endif
-
-#define gm (&_gm_)
-#define is_global(M) ((M) == &_gm_)
-#define is_initialized(M) ((M)->top != 0)
-
-/* -------------------------- system alloc setup ------------------------- */
-
-/* Operations on mflags */
-
-#define use_lock(M) ((M)->mflags & USE_LOCK_BIT)
-#define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT)
-#define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT)
-
-#define use_mmap(M) ((M)->mflags & USE_MMAP_BIT)
-#define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT)
-#define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT)
-
-#define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT)
-#define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT)
-
-#define set_lock(M,L)\
- ((M)->mflags = (L)?\
- ((M)->mflags | USE_LOCK_BIT) :\
- ((M)->mflags & ~USE_LOCK_BIT))
-
-/* page-align a size */
-#define page_align(S)\
- (((S) + (mparams.page_size)) & ~(mparams.page_size - SIZE_T_ONE))
-
-/* granularity-align a size */
-#define granularity_align(S)\
- (((S) + (mparams.granularity)) & ~(mparams.granularity - SIZE_T_ONE))
-
-#define is_page_aligned(S)\
- (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0)
-#define is_granularity_aligned(S)\
- (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0)
-
-/* True if segment S holds address A */
-#define segment_holds(S, A)\
- ((char*)(A) >= S->base && (char*)(A) < S->base + S->size)
-
-/* Return segment holding given address */
-static msegmentptr segment_holding(mstate m, char* addr) {
- msegmentptr sp = &m->seg;
- for (;;) {
- if (addr >= sp->base && addr < sp->base + sp->size)
- return sp;
- if ((sp = sp->next) == 0)
- return 0;
- }
-}
-
-/* Return true if segment contains a segment link */
-static int has_segment_link(mstate m, msegmentptr ss) {
- msegmentptr sp = &m->seg;
- for (;;) {
- if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size)
- return 1;
- if ((sp = sp->next) == 0)
- return 0;
- }
-}
-
-#ifndef MORECORE_CANNOT_TRIM
-#define should_trim(M,s) ((s) > (M)->trim_check)
-#else /* MORECORE_CANNOT_TRIM */
-#define should_trim(M,s) (0)
-#endif /* MORECORE_CANNOT_TRIM */
-
-/*
- TOP_FOOT_SIZE is padding at the end of a segment, including space
- that may be needed to place segment records and fenceposts when new
- noncontiguous segments are added.
-*/
-#define TOP_FOOT_SIZE\
- (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
-
-
-/* ------------------------------- Hooks -------------------------------- */
-
-/*
- PREACTION should be defined to return 0 on success, and nonzero on
- failure. If you are not using locking, you can redefine these to do
- anything you like.
-*/
-
-#if USE_LOCKS
-
-/* Ensure locks are initialized */
-#define GLOBALLY_INITIALIZE() (mparams.page_size == 0 && init_mparams())
-
-#define PREACTION(M) ((GLOBALLY_INITIALIZE() || use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0)
-#define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); }
-#else /* USE_LOCKS */
-
-#ifndef PREACTION
-#define PREACTION(M) (0)
-#endif /* PREACTION */
-
-#ifndef POSTACTION
-#define POSTACTION(M)
-#endif /* POSTACTION */
-
-#endif /* USE_LOCKS */
-
-/*
- CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses.
- USAGE_ERROR_ACTION is triggered on detected bad frees and
- reallocs. The argument p is an address that might have triggered the
- fault. It is ignored by the two predefined actions, but might be
- useful in custom actions that try to help diagnose errors.
-*/
-
-#if PROCEED_ON_ERROR
-
-/* A count of the number of corruption errors causing resets */
-int malloc_corruption_error_count;
-
-/* default corruption action */
-static void reset_on_error(mstate m);
-
-#define CORRUPTION_ERROR_ACTION(m) reset_on_error(m)
-#define USAGE_ERROR_ACTION(m, p)
-
-#else /* PROCEED_ON_ERROR */
-
-#ifndef CORRUPTION_ERROR_ACTION
-#define CORRUPTION_ERROR_ACTION(m) ABORT
-#endif /* CORRUPTION_ERROR_ACTION */
-
-#ifndef USAGE_ERROR_ACTION
-#define USAGE_ERROR_ACTION(m,p) ABORT
-#endif /* USAGE_ERROR_ACTION */
-
-#endif /* PROCEED_ON_ERROR */
-
-/* -------------------------- Debugging setup ---------------------------- */
-
-#if ! DEBUG
-
-#define check_free_chunk(M,P)
-#define check_inuse_chunk(M,P)
-#define check_malloced_chunk(M,P,N)
-#define check_mmapped_chunk(M,P)
-#define check_malloc_state(M)
-#define check_top_chunk(M,P)
-
-#else /* DEBUG */
-#define check_free_chunk(M,P) do_check_free_chunk(M,P)
-#define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P)
-#define check_top_chunk(M,P) do_check_top_chunk(M,P)
-#define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N)
-#define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P)
-#define check_malloc_state(M) do_check_malloc_state(M)
-
-static void do_check_any_chunk(mstate m, mchunkptr p);
-static void do_check_top_chunk(mstate m, mchunkptr p);
-static void do_check_mmapped_chunk(mstate m, mchunkptr p);
-static void do_check_inuse_chunk(mstate m, mchunkptr p);
-static void do_check_free_chunk(mstate m, mchunkptr p);
-static void do_check_malloced_chunk(mstate m, void* mem, size_t s);
-static void do_check_tree(mstate m, tchunkptr t);
-static void do_check_treebin(mstate m, bindex_t i);
-static void do_check_smallbin(mstate m, bindex_t i);
-static void do_check_malloc_state(mstate m);
-static int bin_find(mstate m, mchunkptr x);
-static size_t traverse_and_check(mstate m);
-#endif /* DEBUG */
-
-/* ---------------------------- Indexing Bins ---------------------------- */
-
-#define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS)
-#define small_index(s) ((s) >> SMALLBIN_SHIFT)
-#define small_index2size(i) ((i) << SMALLBIN_SHIFT)
-#define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE))
-
-/* addressing by index. See above about smallbin repositioning */
-#define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1])))
-#define treebin_at(M,i) (&((M)->treebins[i]))
-
-/* assign tree index for size S to variable I */
-#if defined(__GNUC__) && defined(i386)
-#define compute_tree_index(S, I)\
-{\
- size_t X = S >> TREEBIN_SHIFT;\
- if (X == 0)\
- I = 0;\
- else if (X > 0xFFFF)\
- I = NTREEBINS-1;\
- else {\
- unsigned int K;\
- __asm__("bsrl %1,%0\n\t" : "=r" (K) : "rm" (X));\
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
- }\
-}
-#else /* GNUC */
-#define compute_tree_index(S, I)\
-{\
- size_t X = S >> TREEBIN_SHIFT;\
- if (X == 0)\
- I = 0;\
- else if (X > 0xFFFF)\
- I = NTREEBINS-1;\
- else {\
- unsigned int Y = (unsigned int)X;\
- unsigned int N = ((Y - 0x100) >> 16) & 8;\
- unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\
- N += K;\
- N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\
- K = 14 - N + ((Y <<= K) >> 15);\
- I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\
- }\
-}
-#endif /* GNUC */
-
-/* Bit representing maximum resolved size in a treebin at i */
-#define bit_for_tree_index(i) \
- (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2)
-
-/* Shift placing maximum resolved bit in a treebin at i as sign bit */
-#define leftshift_for_tree_index(i) \
- ((i == NTREEBINS-1)? 0 : \
- ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2)))
-
-/* The size of the smallest chunk held in bin with index i */
-#define minsize_for_tree_index(i) \
- ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \
- (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1)))
-
-
-/* ------------------------ Operations on bin maps ----------------------- */
-
-/* bit corresponding to given index */
-#define idx2bit(i) ((binmap_t)(1) << (i))
-
-/* Mark/Clear bits with given index */
-#define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i))
-#define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i))
-#define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i))
-
-#define mark_treemap(M,i) ((M)->treemap |= idx2bit(i))
-#define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i))
-#define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i))
-
-/* index corresponding to given bit */
-
-#if defined(__GNUC__) && defined(i386)
-#define compute_bit2idx(X, I)\
-{\
- unsigned int J;\
- __asm__("bsfl %1,%0\n\t" : "=r" (J) : "rm" (X));\
- I = (bindex_t)J;\
-}
-
-#else /* GNUC */
-#if USE_BUILTIN_FFS
-#define compute_bit2idx(X, I) I = ffs(X)-1
-
-#else /* USE_BUILTIN_FFS */
-#define compute_bit2idx(X, I)\
-{\
- unsigned int Y = X - 1;\
- unsigned int K = Y >> (16-4) & 16;\
- unsigned int N = K; Y >>= K;\
- N += K = Y >> (8-3) & 8; Y >>= K;\
- N += K = Y >> (4-2) & 4; Y >>= K;\
- N += K = Y >> (2-1) & 2; Y >>= K;\
- N += K = Y >> (1-0) & 1; Y >>= K;\
- I = (bindex_t)(N + Y);\
-}
-#endif /* USE_BUILTIN_FFS */
-#endif /* GNUC */
-
-/* isolate the least set bit of a bitmap */
-#define least_bit(x) ((x) & -(x))
-
-/* mask with all bits to left of least bit of x on */
-#define left_bits(x) ((x<<1) | -(x<<1))
-
-/* mask with all bits to left of or equal to least bit of x on */
-#define same_or_left_bits(x) ((x) | -(x))
-
-
-/* ----------------------- Runtime Check Support ------------------------- */
-
-/*
- For security, the main invariant is that malloc/free/etc never
- writes to a static address other than malloc_state, unless static
- malloc_state itself has been corrupted, which cannot occur via
- malloc (because of these checks). In essence this means that we
- believe all pointers, sizes, maps etc held in malloc_state, but
- check all of those linked or offsetted from other embedded data
- structures. These checks are interspersed with main code in a way
- that tends to minimize their run-time cost.
-
- When FOOTERS is defined, in addition to range checking, we also
- verify footer fields of inuse chunks, which can be used guarantee
- that the mstate controlling malloc/free is intact. This is a
- streamlined version of the approach described by William Robertson
- et al in "Run-time Detection of Heap-based Overflows" LISA'03
- http://www.usenix.org/events/lisa03/tech/robertson.html The footer
- of an inuse chunk holds the xor of its mstate and a random seed,
- that is checked upon calls to free() and realloc(). This is
- (probablistically) unguessable from outside the program, but can be
- computed by any code successfully malloc'ing any chunk, so does not
- itself provide protection against code that has already broken
- security through some other means. Unlike Robertson et al, we
- always dynamically check addresses of all offset chunks (previous,
- next, etc). This turns out to be cheaper than relying on hashes.
-*/
-
-#if !INSECURE
-/* Check if address a is at least as high as any from MORECORE or MMAP */
-#define ok_address(M, a) ((char*)(a) >= (M)->least_addr)
-/* Check if address of next chunk n is higher than base chunk p */
-#define ok_next(p, n) ((char*)(p) < (char*)(n))
-/* Check if p has its cinuse bit on */
-#define ok_cinuse(p) cinuse(p)
-/* Check if p has its pinuse bit on */
-#define ok_pinuse(p) pinuse(p)
-
-#else /* !INSECURE */
-#define ok_address(M, a) (1)
-#define ok_next(b, n) (1)
-#define ok_cinuse(p) (1)
-#define ok_pinuse(p) (1)
-#endif /* !INSECURE */
-
-#if (FOOTERS && !INSECURE)
-/* Check if (alleged) mstate m has expected magic field */
-#define ok_magic(M) ((M)->magic == mparams.magic)
-#else /* (FOOTERS && !INSECURE) */
-#define ok_magic(M) (1)
-#endif /* (FOOTERS && !INSECURE) */
-
-
-/* In gcc, use __builtin_expect to minimize impact of checks */
-#if !INSECURE
-#if defined(__GNUC__) && __GNUC__ >= 3
-#define RTCHECK(e) __builtin_expect(e, 1)
-#else /* GNUC */
-#define RTCHECK(e) (e)
-#endif /* GNUC */
-#else /* !INSECURE */
-#define RTCHECK(e) (1)
-#endif /* !INSECURE */
-
-/* macros to set up inuse chunks with or without footers */
-
-#if !FOOTERS
-
-#define mark_inuse_foot(M,p,s)
-
-/* Set cinuse bit and pinuse bit of next chunk */
-#define set_inuse(M,p,s)\
- ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
- ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
-
-/* Set cinuse and pinuse of this chunk and pinuse of next chunk */
-#define set_inuse_and_pinuse(M,p,s)\
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
- ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
-
-/* Set size, cinuse and pinuse bit of this chunk */
-#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT))
-
-#else /* FOOTERS */
-
-/* Set foot of inuse chunk to be xor of mstate and seed */
-#define mark_inuse_foot(M,p,s)\
- (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))
-
-#define get_mstate_for(p)\
- ((mstate)(((mchunkptr)((char*)(p) +\
- (chunksize(p))))->prev_foot ^ mparams.magic))
-
-#define set_inuse(M,p,s)\
- ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
- (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \
- mark_inuse_foot(M,p,s))
-
-#define set_inuse_and_pinuse(M,p,s)\
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
- (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\
- mark_inuse_foot(M,p,s))
-
-#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
- mark_inuse_foot(M, p, s))
-
-#endif /* !FOOTERS */
-
-/* ---------------------------- setting mparams -------------------------- */
-
-/* Initialize mparams */
-static int init_mparams(void) {
- if (mparams.page_size == 0) {
- size_t s;
-
- mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD;
- mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD;
-#if MORECORE_CONTIGUOUS
- mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT;
-#else /* MORECORE_CONTIGUOUS */
- mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT;
-#endif /* MORECORE_CONTIGUOUS */
-
-#if (FOOTERS && !INSECURE)
- {
-#if USE_DEV_RANDOM
- int fd;
- unsigned char buf[sizeof(size_t)];
- /* Try to use /dev/urandom, else fall back on using time */
- if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 &&
- read(fd, buf, sizeof(buf)) == sizeof(buf)) {
- s = *((size_t *) buf);
- close(fd);
- }
- else
-#endif /* USE_DEV_RANDOM */
- s = (size_t)(time(0) ^ (size_t)0x55555555U);
-
- s |= (size_t)8U; /* ensure nonzero */
- s &= ~(size_t)7U; /* improve chances of fault for bad values */
-
- }
-#else /* (FOOTERS && !INSECURE) */
- s = (size_t)0x58585858U;
-#endif /* (FOOTERS && !INSECURE) */
- ACQUIRE_MAGIC_INIT_LOCK();
- if (mparams.magic == 0) {
- mparams.magic = s;
- /* Set up lock for main malloc area */
- INITIAL_LOCK(&gm->mutex);
- gm->mflags = mparams.default_mflags;
- }
- RELEASE_MAGIC_INIT_LOCK();
-
-#ifndef WIN32
- mparams.page_size = malloc_getpagesize;
- mparams.granularity = ((DEFAULT_GRANULARITY != 0)?
- DEFAULT_GRANULARITY : mparams.page_size);
-#else /* WIN32 */
- {
- SYSTEM_INFO system_info;
- GetSystemInfo(&system_info);
- mparams.page_size = system_info.dwPageSize;
- mparams.granularity = system_info.dwAllocationGranularity;
- }
-#endif /* WIN32 */
-
- /* Sanity-check configuration:
- size_t must be unsigned and as wide as pointer type.
- ints must be at least 4 bytes.
- alignment must be at least 8.
- Alignment, min chunk size, and page size must all be powers of 2.
- */
- if ((sizeof(size_t) != sizeof(char*)) ||
- (MAX_SIZE_T < MIN_CHUNK_SIZE) ||
- (sizeof(int) < 4) ||
- (MALLOC_ALIGNMENT < (size_t)8U) ||
- ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) ||
- ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) ||
- ((mparams.granularity & (mparams.granularity-SIZE_T_ONE)) != 0) ||
- ((mparams.page_size & (mparams.page_size-SIZE_T_ONE)) != 0))
- ABORT;
- }
- return 0;
-}
-
-/* support for mallopt */
-static int change_mparam(int param_number, int value) {
- size_t val = (size_t)value;
- init_mparams();
- switch(param_number) {
- case M_TRIM_THRESHOLD:
- mparams.trim_threshold = val;
- return 1;
- case M_GRANULARITY:
- if (val >= mparams.page_size && ((val & (val-1)) == 0)) {
- mparams.granularity = val;
- return 1;
- }
- else
- return 0;
- case M_MMAP_THRESHOLD:
- mparams.mmap_threshold = val;
- return 1;
- default:
- return 0;
- }
-}
-
-#if DEBUG
-/* ------------------------- Debugging Support --------------------------- */
-
-/* Check properties of any chunk, whether free, inuse, mmapped etc */
-static void do_check_any_chunk(mstate m, mchunkptr p) {
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
- assert(ok_address(m, p));
-}
-
-/* Check properties of top chunk */
-static void do_check_top_chunk(mstate m, mchunkptr p) {
- msegmentptr sp = segment_holding(m, (char*)p);
- size_t sz = chunksize(p);
- assert(sp != 0);
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
- assert(ok_address(m, p));
- assert(sz == m->topsize);
- assert(sz > 0);
- assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE);
- assert(pinuse(p));
- assert(!next_pinuse(p));
-}
-
-/* Check properties of (inuse) mmapped chunks */
-static void do_check_mmapped_chunk(mstate m, mchunkptr p) {
- size_t sz = chunksize(p);
- size_t len = (sz + (p->prev_foot & ~IS_MMAPPED_BIT) + MMAP_FOOT_PAD);
- assert(is_mmapped(p));
- assert(use_mmap(m));
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
- assert(ok_address(m, p));
- assert(!is_small(sz));
- assert((len & (mparams.page_size-SIZE_T_ONE)) == 0);
- assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD);
- assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0);
-}
-
-/* Check properties of inuse chunks */
-static void do_check_inuse_chunk(mstate m, mchunkptr p) {
- do_check_any_chunk(m, p);
- assert(cinuse(p));
- assert(next_pinuse(p));
- /* If not pinuse and not mmapped, previous chunk has OK offset */
- assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p);
- if (is_mmapped(p))
- do_check_mmapped_chunk(m, p);
-}
-
-/* Check properties of free chunks */
-static void do_check_free_chunk(mstate m, mchunkptr p) {
- size_t sz = p->head & ~(PINUSE_BIT|CINUSE_BIT);
- mchunkptr next = chunk_plus_offset(p, sz);
- do_check_any_chunk(m, p);
- assert(!cinuse(p));
- assert(!next_pinuse(p));
- assert (!is_mmapped(p));
- if (p != m->dv && p != m->top) {
- if (sz >= MIN_CHUNK_SIZE) {
- assert((sz & CHUNK_ALIGN_MASK) == 0);
- assert(is_aligned(chunk2mem(p)));
- assert(next->prev_foot == sz);
- assert(pinuse(p));
- assert (next == m->top || cinuse(next));
- assert(p->fd->bk == p);
- assert(p->bk->fd == p);
- }
- else /* markers are always of size SIZE_T_SIZE */
- assert(sz == SIZE_T_SIZE);
- }
-}
-
-/* Check properties of malloced chunks at the point they are malloced */
-static void do_check_malloced_chunk(mstate m, void* mem, size_t s) {
- if (mem != 0) {
- mchunkptr p = mem2chunk(mem);
- size_t sz = p->head & ~(PINUSE_BIT|CINUSE_BIT);
- do_check_inuse_chunk(m, p);
- assert((sz & CHUNK_ALIGN_MASK) == 0);
- assert(sz >= MIN_CHUNK_SIZE);
- assert(sz >= s);
- /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */
- assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE));
- }
-}
-
-/* Check a tree and its subtrees. */
-static void do_check_tree(mstate m, tchunkptr t) {
- tchunkptr head = 0;
- tchunkptr u = t;
- bindex_t tindex = t->index;
- size_t tsize = chunksize(t);
- bindex_t idx;
- compute_tree_index(tsize, idx);
- assert(tindex == idx);
- assert(tsize >= MIN_LARGE_SIZE);
- assert(tsize >= minsize_for_tree_index(idx));
- assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1))));
-
- do { /* traverse through chain of same-sized nodes */
- do_check_any_chunk(m, ((mchunkptr)u));
- assert(u->index == tindex);
- assert(chunksize(u) == tsize);
- assert(!cinuse(u));
- assert(!next_pinuse(u));
- assert(u->fd->bk == u);
- assert(u->bk->fd == u);
- if (u->parent == 0) {
- assert(u->child[0] == 0);
- assert(u->child[1] == 0);
- }
- else {
- assert(head == 0); /* only one node on chain has parent */
- head = u;
- assert(u->parent != u);
- assert (u->parent->child[0] == u ||
- u->parent->child[1] == u ||
- *((tbinptr*)(u->parent)) == u);
- if (u->child[0] != 0) {
- assert(u->child[0]->parent == u);
- assert(u->child[0] != u);
- do_check_tree(m, u->child[0]);
- }
- if (u->child[1] != 0) {
- assert(u->child[1]->parent == u);
- assert(u->child[1] != u);
- do_check_tree(m, u->child[1]);
- }
- if (u->child[0] != 0 && u->child[1] != 0) {
- assert(chunksize(u->child[0]) < chunksize(u->child[1]));
- }
- }
- u = u->fd;
- } while (u != t);
- assert(head != 0);
-}
-
-/* Check all the chunks in a treebin. */
-static void do_check_treebin(mstate m, bindex_t i) {
- tbinptr* tb = treebin_at(m, i);
- tchunkptr t = *tb;
- int empty = (m->treemap & (1U << i)) == 0;
- if (t == 0)
- assert(empty);
- if (!empty)
- do_check_tree(m, t);
-}
-
-/* Check all the chunks in a smallbin. */
-static void do_check_smallbin(mstate m, bindex_t i) {
- sbinptr b = smallbin_at(m, i);
- mchunkptr p = b->bk;
- unsigned int empty = (m->smallmap & (1U << i)) == 0;
- if (p == b)
- assert(empty);
- if (!empty) {
- for (; p != b; p = p->bk) {
- size_t size = chunksize(p);
- mchunkptr q;
- /* each chunk claims to be free */
- do_check_free_chunk(m, p);
- /* chunk belongs in bin */
- assert(small_index(size) == i);
- assert(p->bk == b || chunksize(p->bk) == chunksize(p));
- /* chunk is followed by an inuse chunk */
- q = next_chunk(p);
- if (q->head != FENCEPOST_HEAD)
- do_check_inuse_chunk(m, q);
- }
- }
-}
-
-/* Find x in a bin. Used in other check functions. */
-static int bin_find(mstate m, mchunkptr x) {
- size_t size = chunksize(x);
- if (is_small(size)) {
- bindex_t sidx = small_index(size);
- sbinptr b = smallbin_at(m, sidx);
- if (smallmap_is_marked(m, sidx)) {
- mchunkptr p = b;
- do {
- if (p == x)
- return 1;
- } while ((p = p->fd) != b);
- }
- }
- else {
- bindex_t tidx;
- compute_tree_index(size, tidx);
- if (treemap_is_marked(m, tidx)) {
- tchunkptr t = *treebin_at(m, tidx);
- size_t sizebits = size << leftshift_for_tree_index(tidx);
- while (t != 0 && chunksize(t) != size) {
- t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
- sizebits <<= 1;
- }
- if (t != 0) {
- tchunkptr u = t;
- do {
- if (u == (tchunkptr)x)
- return 1;
- } while ((u = u->fd) != t);
- }
- }
- }
- return 0;
-}
-
-/* Traverse each chunk and check it; return total */
-static size_t traverse_and_check(mstate m) {
- size_t sum = 0;
- if (is_initialized(m)) {
- msegmentptr s = &m->seg;
- sum += m->topsize + TOP_FOOT_SIZE;
- while (s != 0) {
- mchunkptr q = align_as_chunk(s->base);
- mchunkptr lastq = 0;
- assert(pinuse(q));
- while (segment_holds(s, q) &&
- q != m->top && q->head != FENCEPOST_HEAD) {
- sum += chunksize(q);
- if (cinuse(q)) {
- assert(!bin_find(m, q));
- do_check_inuse_chunk(m, q);
- }
- else {
- assert(q == m->dv || bin_find(m, q));
- assert(lastq == 0 || cinuse(lastq)); /* Not 2 consecutive free */
- do_check_free_chunk(m, q);
- }
- lastq = q;
- q = next_chunk(q);
- }
- s = s->next;
- }
- }
- return sum;
-}
-
-/* Check all properties of malloc_state. */
-static void do_check_malloc_state(mstate m) {
- bindex_t i;
- size_t total;
- /* check bins */
- for (i = 0; i < NSMALLBINS; ++i)
- do_check_smallbin(m, i);
- for (i = 0; i < NTREEBINS; ++i)
- do_check_treebin(m, i);
-
- if (m->dvsize != 0) { /* check dv chunk */
- do_check_any_chunk(m, m->dv);
- assert(m->dvsize == chunksize(m->dv));
- assert(m->dvsize >= MIN_CHUNK_SIZE);
- assert(bin_find(m, m->dv) == 0);
- }
-
- if (m->top != 0) { /* check top chunk */
- do_check_top_chunk(m, m->top);
- assert(m->topsize == chunksize(m->top));
- assert(m->topsize > 0);
- assert(bin_find(m, m->top) == 0);
- }
-
- total = traverse_and_check(m);
- assert(total <= m->footprint);
- assert(m->footprint <= m->max_footprint);
-#if USE_MAX_ALLOWED_FOOTPRINT
- //TODO: change these assertions if we allow for shrinking.
- assert(m->footprint <= m->max_allowed_footprint);
- assert(m->max_footprint <= m->max_allowed_footprint);
-#endif
-}
-#endif /* DEBUG */
-
-/* ----------------------------- statistics ------------------------------ */
-
-#if !NO_MALLINFO
-static struct mallinfo internal_mallinfo(mstate m) {
- struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
- if (!PREACTION(m)) {
- check_malloc_state(m);
- if (is_initialized(m)) {
- size_t nfree = SIZE_T_ONE; /* top always free */
- size_t mfree = m->topsize + TOP_FOOT_SIZE;
- size_t sum = mfree;
- msegmentptr s = &m->seg;
- while (s != 0) {
- mchunkptr q = align_as_chunk(s->base);
- while (segment_holds(s, q) &&
- q != m->top && q->head != FENCEPOST_HEAD) {
- size_t sz = chunksize(q);
- sum += sz;
- if (!cinuse(q)) {
- mfree += sz;
- ++nfree;
- }
- q = next_chunk(q);
- }
- s = s->next;
- }
-
- nm.arena = sum;
- nm.ordblks = nfree;
- nm.hblkhd = m->footprint - sum;
- nm.usmblks = m->max_footprint;
- nm.uordblks = m->footprint - mfree;
- nm.fordblks = mfree;
- nm.keepcost = m->topsize;
- }
-
- POSTACTION(m);
- }
- return nm;
-}
-#endif /* !NO_MALLINFO */
-
-static void internal_malloc_stats(mstate m) {
- if (!PREACTION(m)) {
- size_t maxfp = 0;
- size_t fp = 0;
- size_t used = 0;
- check_malloc_state(m);
- if (is_initialized(m)) {
- msegmentptr s = &m->seg;
- maxfp = m->max_footprint;
- fp = m->footprint;
- used = fp - (m->topsize + TOP_FOOT_SIZE);
-
- while (s != 0) {
- mchunkptr q = align_as_chunk(s->base);
- while (segment_holds(s, q) &&
- q != m->top && q->head != FENCEPOST_HEAD) {
- if (!cinuse(q))
- used -= chunksize(q);
- q = next_chunk(q);
- }
- s = s->next;
- }
- }
-
- fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp));
- fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp));
- fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used));
-
- POSTACTION(m);
- }
-}
-
-/* ----------------------- Operations on smallbins ----------------------- */
-
-/*
- Various forms of linking and unlinking are defined as macros. Even
- the ones for trees, which are very long but have very short typical
- paths. This is ugly but reduces reliance on inlining support of
- compilers.
-*/
-
-/* Link a free chunk into a smallbin */
-#define insert_small_chunk(M, P, S) {\
- bindex_t I = small_index(S);\
- mchunkptr B = smallbin_at(M, I);\
- mchunkptr F = B;\
- assert(S >= MIN_CHUNK_SIZE);\
- if (!smallmap_is_marked(M, I))\
- mark_smallmap(M, I);\
- else if (RTCHECK(ok_address(M, B->fd)))\
- F = B->fd;\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- }\
- B->fd = P;\
- F->bk = P;\
- P->fd = F;\
- P->bk = B;\
-}
-
-/* Unlink a chunk from a smallbin
- * Added check: if F->bk != P or B->fd != P, we have double linked list
- * corruption, and abort.
- */
-#define unlink_small_chunk(M, P, S) {\
- mchunkptr F = P->fd;\
- mchunkptr B = P->bk;\
- bindex_t I = small_index(S);\
- if (__builtin_expect (F->bk != P || B->fd != P, 0))\
- CORRUPTION_ERROR_ACTION(M);\
- assert(P != B);\
- assert(P != F);\
- assert(chunksize(P) == small_index2size(I));\
- if (F == B)\
- clear_smallmap(M, I);\
- else if (RTCHECK((F == smallbin_at(M,I) || ok_address(M, F)) &&\
- (B == smallbin_at(M,I) || ok_address(M, B)))) {\
- F->bk = B;\
- B->fd = F;\
- }\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- }\
-}
-
-/* Unlink the first chunk from a smallbin
- * Added check: if F->bk != P or B->fd != P, we have double linked list
- * corruption, and abort.
- */
-#define unlink_first_small_chunk(M, B, P, I) {\
- mchunkptr F = P->fd;\
- if (__builtin_expect (F->bk != P || B->fd != P, 0))\
- CORRUPTION_ERROR_ACTION(M);\
- assert(P != B);\
- assert(P != F);\
- assert(chunksize(P) == small_index2size(I));\
- if (B == F)\
- clear_smallmap(M, I);\
- else if (RTCHECK(ok_address(M, F))) {\
- B->fd = F;\
- F->bk = B;\
- }\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- }\
-}
-
-/* Replace dv node, binning the old one */
-/* Used only when dvsize known to be small */
-#define replace_dv(M, P, S) {\
- size_t DVS = M->dvsize;\
- if (DVS != 0) {\
- mchunkptr DV = M->dv;\
- assert(is_small(DVS));\
- insert_small_chunk(M, DV, DVS);\
- }\
- M->dvsize = S;\
- M->dv = P;\
-}
-
-/* ------------------------- Operations on trees ------------------------- */
-
-/* Insert chunk into tree */
-#define insert_large_chunk(M, X, S) {\
- tbinptr* H;\
- bindex_t I;\
- compute_tree_index(S, I);\
- H = treebin_at(M, I);\
- X->index = I;\
- X->child[0] = X->child[1] = 0;\
- if (!treemap_is_marked(M, I)) {\
- mark_treemap(M, I);\
- *H = X;\
- X->parent = (tchunkptr)H;\
- X->fd = X->bk = X;\
- }\
- else {\
- tchunkptr T = *H;\
- size_t K = S << leftshift_for_tree_index(I);\
- for (;;) {\
- if (chunksize(T) != S) {\
- tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\
- K <<= 1;\
- if (*C != 0)\
- T = *C;\
- else if (RTCHECK(ok_address(M, C))) {\
- *C = X;\
- X->parent = T;\
- X->fd = X->bk = X;\
- break;\
- }\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- break;\
- }\
- }\
- else {\
- tchunkptr F = T->fd;\
- if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\
- T->fd = F->bk = X;\
- X->fd = F;\
- X->bk = T;\
- X->parent = 0;\
- break;\
- }\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- break;\
- }\
- }\
- }\
- }\
-}
-
-/*
- Unlink steps:
-
- 1. If x is a chained node, unlink it from its same-sized fd/bk links
- and choose its bk node as its replacement.
- 2. If x was the last node of its size, but not a leaf node, it must
- be replaced with a leaf node (not merely one with an open left or
- right), to make sure that lefts and rights of descendents
- correspond properly to bit masks. We use the rightmost descendent
- of x. We could use any other leaf, but this is easy to locate and
- tends to counteract removal of leftmosts elsewhere, and so keeps
- paths shorter than minimally guaranteed. This doesn't loop much
- because on average a node in a tree is near the bottom.
- 3. If x is the base of a chain (i.e., has parent links) relink
- x's parent and children to x's replacement (or null if none).
-
- Added check: if F->bk != X or R->fd != X, we have double linked list
- corruption, and abort.
-*/
-
-#define unlink_large_chunk(M, X) {\
- tchunkptr XP = X->parent;\
- tchunkptr R;\
- if (X->bk != X) {\
- tchunkptr F = X->fd;\
- R = X->bk;\
- if (__builtin_expect (F->bk != X || R->fd != X, 0))\
- CORRUPTION_ERROR_ACTION(M);\
- if (RTCHECK(ok_address(M, F))) {\
- F->bk = R;\
- R->fd = F;\
- }\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- }\
- }\
- else {\
- tchunkptr* RP;\
- if (((R = *(RP = &(X->child[1]))) != 0) ||\
- ((R = *(RP = &(X->child[0]))) != 0)) {\
- tchunkptr* CP;\
- while ((*(CP = &(R->child[1])) != 0) ||\
- (*(CP = &(R->child[0])) != 0)) {\
- R = *(RP = CP);\
- }\
- if (RTCHECK(ok_address(M, RP)))\
- *RP = 0;\
- else {\
- CORRUPTION_ERROR_ACTION(M);\
- }\
- }\
- }\
- if (XP != 0) {\
- tbinptr* H = treebin_at(M, X->index);\
- if (X == *H) {\
- if ((*H = R) == 0) \
- clear_treemap(M, X->index);\
- }\
- else if (RTCHECK(ok_address(M, XP))) {\
- if (XP->child[0] == X) \
- XP->child[0] = R;\
- else \
- XP->child[1] = R;\
- }\
- else\
- CORRUPTION_ERROR_ACTION(M);\
- if (R != 0) {\
- if (RTCHECK(ok_address(M, R))) {\
- tchunkptr C0, C1;\
- R->parent = XP;\
- if ((C0 = X->child[0]) != 0) {\
- if (RTCHECK(ok_address(M, C0))) {\
- R->child[0] = C0;\
- C0->parent = R;\
- }\
- else\
- CORRUPTION_ERROR_ACTION(M);\
- }\
- if ((C1 = X->child[1]) != 0) {\
- if (RTCHECK(ok_address(M, C1))) {\
- R->child[1] = C1;\
- C1->parent = R;\
- }\
- else\
- CORRUPTION_ERROR_ACTION(M);\
- }\
- }\
- else\
- CORRUPTION_ERROR_ACTION(M);\
- }\
- }\
-}
-
-/* Relays to large vs small bin operations */
-
-#define insert_chunk(M, P, S)\
- if (is_small(S)) insert_small_chunk(M, P, S)\
- else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); }
-
-#define unlink_chunk(M, P, S)\
- if (is_small(S)) unlink_small_chunk(M, P, S)\
- else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); }
-
-
-/* Relays to internal calls to malloc/free from realloc, memalign etc */
-
-#if ONLY_MSPACES
-#define internal_malloc(m, b) mspace_malloc(m, b)
-#define internal_free(m, mem) mspace_free(m,mem);
-#else /* ONLY_MSPACES */
-#if MSPACES
-#define internal_malloc(m, b)\
- (m == gm)? dlmalloc(b) : mspace_malloc(m, b)
-#define internal_free(m, mem)\
- if (m == gm) dlfree(mem); else mspace_free(m,mem);
-#else /* MSPACES */
-#define internal_malloc(m, b) dlmalloc(b)
-#define internal_free(m, mem) dlfree(mem)
-#endif /* MSPACES */
-#endif /* ONLY_MSPACES */
-
-/* ----------------------- Direct-mmapping chunks ----------------------- */
-
-/*
- Directly mmapped chunks are set up with an offset to the start of
- the mmapped region stored in the prev_foot field of the chunk. This
- allows reconstruction of the required argument to MUNMAP when freed,
- and also allows adjustment of the returned chunk to meet alignment
- requirements (especially in memalign). There is also enough space
- allocated to hold a fake next chunk of size SIZE_T_SIZE to maintain
- the PINUSE bit so frees can be checked.
-*/
-
-/* Malloc using mmap */
-static void* mmap_alloc(mstate m, size_t nb) {
- size_t mmsize = granularity_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
-#if USE_MAX_ALLOWED_FOOTPRINT
- size_t new_footprint = m->footprint + mmsize;
- if (new_footprint <= m->footprint || /* Check for wrap around 0 */
- new_footprint > m->max_allowed_footprint)
- return 0;
-#endif
- if (mmsize > nb) { /* Check for wrap around 0 */
- char* mm = (char*)(DIRECT_MMAP(mmsize));
- if (mm != CMFAIL) {
- size_t offset = align_offset(chunk2mem(mm));
- size_t psize = mmsize - offset - MMAP_FOOT_PAD;
- mchunkptr p = (mchunkptr)(mm + offset);
- p->prev_foot = offset | IS_MMAPPED_BIT;
- (p)->head = (psize|CINUSE_BIT);
- mark_inuse_foot(m, p, psize);
- chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;
- chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;
-
- if (mm < m->least_addr)
- m->least_addr = mm;
- if ((m->footprint += mmsize) > m->max_footprint)
- m->max_footprint = m->footprint;
- assert(is_aligned(chunk2mem(p)));
- check_mmapped_chunk(m, p);
- return chunk2mem(p);
- }
- }
- return 0;
-}
-
-/* Realloc using mmap */
-static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb) {
- size_t oldsize = chunksize(oldp);
- if (is_small(nb)) /* Can't shrink mmap regions below small size */
- return 0;
- /* Keep old chunk if big enough but not too big */
- if (oldsize >= nb + SIZE_T_SIZE &&
- (oldsize - nb) <= (mparams.granularity << 1))
- return oldp;
- else {
- size_t offset = oldp->prev_foot & ~IS_MMAPPED_BIT;
- size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD;
- size_t newmmsize = granularity_align(nb + SIX_SIZE_T_SIZES +
- CHUNK_ALIGN_MASK);
- char* cp = (char*)CALL_MREMAP((char*)oldp - offset,
- oldmmsize, newmmsize, 1);
- if (cp != CMFAIL) {
- mchunkptr newp = (mchunkptr)(cp + offset);
- size_t psize = newmmsize - offset - MMAP_FOOT_PAD;
- newp->head = (psize|CINUSE_BIT);
- mark_inuse_foot(m, newp, psize);
- chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD;
- chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0;
-
- if (cp < m->least_addr)
- m->least_addr = cp;
- if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint)
- m->max_footprint = m->footprint;
- check_mmapped_chunk(m, newp);
- return newp;
- }
- }
- return 0;
-}
-
-/* -------------------------- mspace management -------------------------- */
-
-/* Initialize top chunk and its size */
-static void init_top(mstate m, mchunkptr p, size_t psize) {
- /* Ensure alignment */
- size_t offset = align_offset(chunk2mem(p));
- p = (mchunkptr)((char*)p + offset);
- psize -= offset;
-
- m->top = p;
- m->topsize = psize;
- p->head = psize | PINUSE_BIT;
- /* set size of fake trailing chunk holding overhead space only once */
- chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE;
- m->trim_check = mparams.trim_threshold; /* reset on each update */
-}
-
-/* Initialize bins for a new mstate that is otherwise zeroed out */
-static void init_bins(mstate m) {
- /* Establish circular links for smallbins */
- bindex_t i;
- for (i = 0; i < NSMALLBINS; ++i) {
- sbinptr bin = smallbin_at(m,i);
- bin->fd = bin->bk = bin;
- }
-}
-
-#if PROCEED_ON_ERROR
-
-/* default corruption action */
-static void reset_on_error(mstate m) {
- int i;
- ++malloc_corruption_error_count;
- /* Reinitialize fields to forget about all memory */
- m->smallbins = m->treebins = 0;
- m->dvsize = m->topsize = 0;
- m->seg.base = 0;
- m->seg.size = 0;
- m->seg.next = 0;
- m->top = m->dv = 0;
- for (i = 0; i < NTREEBINS; ++i)
- *treebin_at(m, i) = 0;
- init_bins(m);
-}
-#endif /* PROCEED_ON_ERROR */
-
-/* Allocate chunk and prepend remainder with chunk in successor base. */
-static void* prepend_alloc(mstate m, char* newbase, char* oldbase,
- size_t nb) {
- mchunkptr p = align_as_chunk(newbase);
- mchunkptr oldfirst = align_as_chunk(oldbase);
- size_t psize = (char*)oldfirst - (char*)p;
- mchunkptr q = chunk_plus_offset(p, nb);
- size_t qsize = psize - nb;
- set_size_and_pinuse_of_inuse_chunk(m, p, nb);
-
- assert((char*)oldfirst > (char*)q);
- assert(pinuse(oldfirst));
- assert(qsize >= MIN_CHUNK_SIZE);
-
- /* consolidate remainder with first chunk of old base */
- if (oldfirst == m->top) {
- size_t tsize = m->topsize += qsize;
- m->top = q;
- q->head = tsize | PINUSE_BIT;
- check_top_chunk(m, q);
- }
- else if (oldfirst == m->dv) {
- size_t dsize = m->dvsize += qsize;
- m->dv = q;
- set_size_and_pinuse_of_free_chunk(q, dsize);
- }
- else {
- if (!cinuse(oldfirst)) {
- size_t nsize = chunksize(oldfirst);
- unlink_chunk(m, oldfirst, nsize);
- oldfirst = chunk_plus_offset(oldfirst, nsize);
- qsize += nsize;
- }
- set_free_with_pinuse(q, qsize, oldfirst);
- insert_chunk(m, q, qsize);
- check_free_chunk(m, q);
- }
-
- check_malloced_chunk(m, chunk2mem(p), nb);
- return chunk2mem(p);
-}
-
-
-/* Add a segment to hold a new noncontiguous region */
-static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {
- /* Determine locations and sizes of segment, fenceposts, old top */
- char* old_top = (char*)m->top;
- msegmentptr oldsp = segment_holding(m, old_top);
- char* old_end = oldsp->base + oldsp->size;
- size_t ssize = pad_request(sizeof(struct malloc_segment));
- char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
- size_t offset = align_offset(chunk2mem(rawsp));
- char* asp = rawsp + offset;
- char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp;
- mchunkptr sp = (mchunkptr)csp;
- msegmentptr ss = (msegmentptr)(chunk2mem(sp));
- mchunkptr tnext = chunk_plus_offset(sp, ssize);
- mchunkptr p = tnext;
- int nfences = 0;
-
- /* reset top to new space */
- init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
-
- /* Set up segment record */
- assert(is_aligned(ss));
- set_size_and_pinuse_of_inuse_chunk(m, sp, ssize);
- *ss = m->seg; /* Push current record */
- m->seg.base = tbase;
- m->seg.size = tsize;
- m->seg.sflags = mmapped;
- m->seg.next = ss;
-
- /* Insert trailing fenceposts */
- for (;;) {
- mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE);
- p->head = FENCEPOST_HEAD;
- ++nfences;
- if ((char*)(&(nextp->head)) < old_end)
- p = nextp;
- else
- break;
- }
- assert(nfences >= 2);
-
- /* Insert the rest of old top into a bin as an ordinary free chunk */
- if (csp != old_top) {
- mchunkptr q = (mchunkptr)old_top;
- size_t psize = csp - old_top;
- mchunkptr tn = chunk_plus_offset(q, psize);
- set_free_with_pinuse(q, psize, tn);
- insert_chunk(m, q, psize);
- }
-
- check_top_chunk(m, m->top);
-}
-
-/* -------------------------- System allocation -------------------------- */
-
-/* Get memory from system using MORECORE or MMAP */
-static void* sys_alloc(mstate m, size_t nb) {
- char* tbase = CMFAIL;
- size_t tsize = 0;
- flag_t mmap_flag = 0;
-
- init_mparams();
-
- /* Directly map large chunks */
- if (use_mmap(m) && nb >= mparams.mmap_threshold) {
- void* mem = mmap_alloc(m, nb);
- if (mem != 0)
- return mem;
- }
-
-#if USE_MAX_ALLOWED_FOOTPRINT
- /* Make sure the footprint doesn't grow past max_allowed_footprint.
- * This covers all cases except for where we need to page align, below.
- */
- {
- size_t new_footprint = m->footprint +
- granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE);
- if (new_footprint <= m->footprint || /* Check for wrap around 0 */
- new_footprint > m->max_allowed_footprint)
- return 0;
- }
-#endif
-
- /*
- Try getting memory in any of three ways (in most-preferred to
- least-preferred order):
- 1. A call to MORECORE that can normally contiguously extend memory.
- (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or
- or main space is mmapped or a previous contiguous call failed)
- 2. A call to MMAP new space (disabled if not HAVE_MMAP).
- Note that under the default settings, if MORECORE is unable to
- fulfill a request, and HAVE_MMAP is true, then mmap is
- used as a noncontiguous system allocator. This is a useful backup
- strategy for systems with holes in address spaces -- in this case
- sbrk cannot contiguously expand the heap, but mmap may be able to
- find space.
- 3. A call to MORECORE that cannot usually contiguously extend memory.
- (disabled if not HAVE_MORECORE)
- */
-
- if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {
- char* br = CMFAIL;
- msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);
- size_t asize = 0;
- ACQUIRE_MORECORE_LOCK();
-
- if (ss == 0) { /* First time through or recovery */
- char* base = (char*)CALL_MORECORE(0);
- if (base != CMFAIL) {
- asize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE);
- /* Adjust to end on a page boundary */
- if (!is_page_aligned(base)) {
- asize += (page_align((size_t)base) - (size_t)base);
-#if USE_MAX_ALLOWED_FOOTPRINT
- /* If the alignment pushes us over max_allowed_footprint,
- * poison the upcoming call to MORECORE and continue.
- */
- {
- size_t new_footprint = m->footprint + asize;
- if (new_footprint <= m->footprint || /* Check for wrap around 0 */
- new_footprint > m->max_allowed_footprint) {
- asize = HALF_MAX_SIZE_T;
- }
- }
-#endif
- }
- /* Can't call MORECORE if size is negative when treated as signed */
- if (asize < HALF_MAX_SIZE_T &&
- (br = (char*)(CALL_MORECORE(asize))) == base) {
- tbase = base;
- tsize = asize;
- }
- }
- }
- else {
- /* Subtract out existing available top space from MORECORE request. */
- asize = granularity_align(nb - m->topsize + TOP_FOOT_SIZE + SIZE_T_ONE);
- /* Use mem here only if it did continuously extend old space */
- if (asize < HALF_MAX_SIZE_T &&
- (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {
- tbase = br;
- tsize = asize;
- }
- }
-
- if (tbase == CMFAIL) { /* Cope with partial failure */
- if (br != CMFAIL) { /* Try to use/extend the space we did get */
- if (asize < HALF_MAX_SIZE_T &&
- asize < nb + TOP_FOOT_SIZE + SIZE_T_ONE) {
- size_t esize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE - asize);
- if (esize < HALF_MAX_SIZE_T) {
- char* end = (char*)CALL_MORECORE(esize);
- if (end != CMFAIL)
- asize += esize;
- else { /* Can't use; try to release */
- CALL_MORECORE(-asize);
- br = CMFAIL;
- }
- }
- }
- }
- if (br != CMFAIL) { /* Use the space we did get */
- tbase = br;
- tsize = asize;
- }
- else
- disable_contiguous(m); /* Don't try contiguous path in the future */
- }
-
- RELEASE_MORECORE_LOCK();
- }
-
- if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */
- size_t req = nb + TOP_FOOT_SIZE + SIZE_T_ONE;
- size_t rsize = granularity_align(req);
- if (rsize > nb) { /* Fail if wraps around zero */
- char* mp = (char*)(CALL_MMAP(rsize));
- if (mp != CMFAIL) {
- tbase = mp;
- tsize = rsize;
- mmap_flag = IS_MMAPPED_BIT;
- }
- }
- }
-
- if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */
- size_t asize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE);
- if (asize < HALF_MAX_SIZE_T) {
- char* br = CMFAIL;
- char* end = CMFAIL;
- ACQUIRE_MORECORE_LOCK();
- br = (char*)(CALL_MORECORE(asize));
- end = (char*)(CALL_MORECORE(0));
- RELEASE_MORECORE_LOCK();
- if (br != CMFAIL && end != CMFAIL && br < end) {
- size_t ssize = end - br;
- if (ssize > nb + TOP_FOOT_SIZE) {
- tbase = br;
- tsize = ssize;
- }
- }
- }
- }
-
- if (tbase != CMFAIL) {
-
- if ((m->footprint += tsize) > m->max_footprint)
- m->max_footprint = m->footprint;
-
- if (!is_initialized(m)) { /* first-time initialization */
- m->seg.base = m->least_addr = tbase;
- m->seg.size = tsize;
- m->seg.sflags = mmap_flag;
- m->magic = mparams.magic;
- init_bins(m);
- if (is_global(m))
- init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
- else {
- /* Offset top by embedded malloc_state */
- mchunkptr mn = next_chunk(mem2chunk(m));
- init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);
- }
- }
-
- else {
- /* Try to merge with an existing segment */
- msegmentptr sp = &m->seg;
- while (sp != 0 && tbase != sp->base + sp->size)
- sp = sp->next;
- if (sp != 0 &&
- !is_extern_segment(sp) &&
- (sp->sflags & IS_MMAPPED_BIT) == mmap_flag &&
- segment_holds(sp, m->top)) { /* append */
- sp->size += tsize;
- init_top(m, m->top, m->topsize + tsize);
- }
- else {
- if (tbase < m->least_addr)
- m->least_addr = tbase;
- sp = &m->seg;
- while (sp != 0 && sp->base != tbase + tsize)
- sp = sp->next;
- if (sp != 0 &&
- !is_extern_segment(sp) &&
- (sp->sflags & IS_MMAPPED_BIT) == mmap_flag) {
- char* oldbase = sp->base;
- sp->base = tbase;
- sp->size += tsize;
- return prepend_alloc(m, tbase, oldbase, nb);
- }
- else
- add_segment(m, tbase, tsize, mmap_flag);
- }
- }
-
- if (nb < m->topsize) { /* Allocate from new or extended top space */
- size_t rsize = m->topsize -= nb;
- mchunkptr p = m->top;
- mchunkptr r = m->top = chunk_plus_offset(p, nb);
- r->head = rsize | PINUSE_BIT;
- set_size_and_pinuse_of_inuse_chunk(m, p, nb);
- check_top_chunk(m, m->top);
- check_malloced_chunk(m, chunk2mem(p), nb);
- return chunk2mem(p);
- }
- }
-
- MALLOC_FAILURE_ACTION;
- return 0;
-}
-
-/* ----------------------- system deallocation -------------------------- */
-
-/* Unmap and unlink any mmapped segments that don't contain used chunks */
-static size_t release_unused_segments(mstate m) {
- size_t released = 0;
- msegmentptr pred = &m->seg;
- msegmentptr sp = pred->next;
- while (sp != 0) {
- char* base = sp->base;
- size_t size = sp->size;
- msegmentptr next = sp->next;
- if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {
- mchunkptr p = align_as_chunk(base);
- size_t psize = chunksize(p);
- /* Can unmap if first chunk holds entire segment and not pinned */
- if (!cinuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {
- tchunkptr tp = (tchunkptr)p;
- assert(segment_holds(sp, (char*)sp));
- if (p == m->dv) {
- m->dv = 0;
- m->dvsize = 0;
- }
- else {
- unlink_large_chunk(m, tp);
- }
- if (CALL_MUNMAP(base, size) == 0) {
- released += size;
- m->footprint -= size;
- /* unlink obsoleted record */
- sp = pred;
- sp->next = next;
- }
- else { /* back out if cannot unmap */
- insert_large_chunk(m, tp, psize);
- }
- }
- }
- pred = sp;
- sp = next;
- }
- return released;
-}
-
-static int sys_trim(mstate m, size_t pad) {
- size_t released = 0;
- if (pad < MAX_REQUEST && is_initialized(m)) {
- pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */
-
- if (m->topsize > pad) {
- /* Shrink top space in granularity-size units, keeping at least one */
- size_t unit = mparams.granularity;
- size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -
- SIZE_T_ONE) * unit;
- msegmentptr sp = segment_holding(m, (char*)m->top);
-
- if (!is_extern_segment(sp)) {
- if (is_mmapped_segment(sp)) {
- if (HAVE_MMAP &&
- sp->size >= extra &&
- !has_segment_link(m, sp)) { /* can't shrink if pinned */
-#if HAVE_MMAP && HAVE_MREMAP
- size_t newsize = sp->size - extra;
-#endif
- /* Prefer mremap, fall back to munmap */
- if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||
- (CALL_MUNMAP(sp->base + newsize, extra) == 0)) {
- released = extra;
- }
- }
- }
- else if (HAVE_MORECORE) {
- if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */
- extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;
- ACQUIRE_MORECORE_LOCK();
- {
- /* Make sure end of memory is where we last set it. */
- char* old_br = (char*)(CALL_MORECORE(0));
- if (old_br == sp->base + sp->size) {
- char* rel_br = (char*)(CALL_MORECORE(-extra));
- char* new_br = (char*)(CALL_MORECORE(0));
- if (rel_br != CMFAIL && new_br < old_br)
- released = old_br - new_br;
- }
- }
- RELEASE_MORECORE_LOCK();
- }
- }
-
- if (released != 0) {
- sp->size -= released;
- m->footprint -= released;
- init_top(m, m->top, m->topsize - released);
- check_top_chunk(m, m->top);
- }
- }
-
- /* Unmap any unused mmapped segments */
- if (HAVE_MMAP)
- released += release_unused_segments(m);
-
- /* On failure, disable autotrim to avoid repeated failed future calls */
- if (released == 0)
- m->trim_check = MAX_SIZE_T;
- }
-
- return (released != 0)? 1 : 0;
-}
-
-/* ---------------------------- malloc support --------------------------- */
-
-/* allocate a large request from the best fitting chunk in a treebin */
-static void* tmalloc_large(mstate m, size_t nb) {
- tchunkptr v = 0;
- size_t rsize = -nb; /* Unsigned negation */
- tchunkptr t;
- bindex_t idx;
- compute_tree_index(nb, idx);
-
- if ((t = *treebin_at(m, idx)) != 0) {
- /* Traverse tree for this bin looking for node with size == nb */
- size_t sizebits = nb << leftshift_for_tree_index(idx);
- tchunkptr rst = 0; /* The deepest untaken right subtree */
- for (;;) {
- tchunkptr rt;
- size_t trem = chunksize(t) - nb;
- if (trem < rsize) {
- v = t;
- if ((rsize = trem) == 0)
- break;
- }
- rt = t->child[1];
- t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
- if (rt != 0 && rt != t)
- rst = rt;
- if (t == 0) {
- t = rst; /* set t to least subtree holding sizes > nb */
- break;
- }
- sizebits <<= 1;
- }
- }
-
- if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */
- binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;
- if (leftbits != 0) {
- bindex_t i;
- binmap_t leastbit = least_bit(leftbits);
- compute_bit2idx(leastbit, i);
- t = *treebin_at(m, i);
- }
- }
-
- while (t != 0) { /* find smallest of tree or subtree */
- size_t trem = chunksize(t) - nb;
- if (trem < rsize) {
- rsize = trem;
- v = t;
- }
- t = leftmost_child(t);
- }
-
- /* If dv is a better fit, return 0 so malloc will use it */
- if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {
- if (RTCHECK(ok_address(m, v))) { /* split */
- mchunkptr r = chunk_plus_offset(v, nb);
- assert(chunksize(v) == rsize + nb);
- if (RTCHECK(ok_next(v, r))) {
- unlink_large_chunk(m, v);
- if (rsize < MIN_CHUNK_SIZE)
- set_inuse_and_pinuse(m, v, (rsize + nb));
- else {
- set_size_and_pinuse_of_inuse_chunk(m, v, nb);
- set_size_and_pinuse_of_free_chunk(r, rsize);
- insert_chunk(m, r, rsize);
- }
- return chunk2mem(v);
- }
- }
- CORRUPTION_ERROR_ACTION(m);
- }
- return 0;
-}
-
-/* allocate a small request from the best fitting chunk in a treebin */
-static void* tmalloc_small(mstate m, size_t nb) {
- tchunkptr t, v;
- size_t rsize;
- bindex_t i;
- binmap_t leastbit = least_bit(m->treemap);
- compute_bit2idx(leastbit, i);
-
- v = t = *treebin_at(m, i);
- rsize = chunksize(t) - nb;
-
- while ((t = leftmost_child(t)) != 0) {
- size_t trem = chunksize(t) - nb;
- if (trem < rsize) {
- rsize = trem;
- v = t;
- }
- }
-
- if (RTCHECK(ok_address(m, v))) {
- mchunkptr r = chunk_plus_offset(v, nb);
- assert(chunksize(v) == rsize + nb);
- if (RTCHECK(ok_next(v, r))) {
- unlink_large_chunk(m, v);
- if (rsize < MIN_CHUNK_SIZE)
- set_inuse_and_pinuse(m, v, (rsize + nb));
- else {
- set_size_and_pinuse_of_inuse_chunk(m, v, nb);
- set_size_and_pinuse_of_free_chunk(r, rsize);
- replace_dv(m, r, rsize);
- }
- return chunk2mem(v);
- }
- }
-
- CORRUPTION_ERROR_ACTION(m);
- return 0;
-}
-
-/* --------------------------- realloc support --------------------------- */
-
-static void* internal_realloc(mstate m, void* oldmem, size_t bytes) {
- if (bytes >= MAX_REQUEST) {
- MALLOC_FAILURE_ACTION;
- return 0;
- }
- if (!PREACTION(m)) {
- mchunkptr oldp = mem2chunk(oldmem);
- size_t oldsize = chunksize(oldp);
- mchunkptr next = chunk_plus_offset(oldp, oldsize);
- mchunkptr newp = 0;
- void* extra = 0;
-
- /* Try to either shrink or extend into top. Else malloc-copy-free */
-
- if (RTCHECK(ok_address(m, oldp) && ok_cinuse(oldp) &&
- ok_next(oldp, next) && ok_pinuse(next))) {
- size_t nb = request2size(bytes);
- if (is_mmapped(oldp))
- newp = mmap_resize(m, oldp, nb);
- else if (oldsize >= nb) { /* already big enough */
- size_t rsize = oldsize - nb;
- newp = oldp;
- if (rsize >= MIN_CHUNK_SIZE) {
- mchunkptr remainder = chunk_plus_offset(newp, nb);
- set_inuse(m, newp, nb);
- set_inuse(m, remainder, rsize);
- extra = chunk2mem(remainder);
- }
- }
- else if (next == m->top && oldsize + m->topsize > nb) {
- /* Expand into top */
- size_t newsize = oldsize + m->topsize;
- size_t newtopsize = newsize - nb;
- mchunkptr newtop = chunk_plus_offset(oldp, nb);
- set_inuse(m, oldp, nb);
- newtop->head = newtopsize |PINUSE_BIT;
- m->top = newtop;
- m->topsize = newtopsize;
- newp = oldp;
- }
- }
- else {
- USAGE_ERROR_ACTION(m, oldmem);
- POSTACTION(m);
- return 0;
- }
-
- POSTACTION(m);
-
- if (newp != 0) {
- if (extra != 0) {
- internal_free(m, extra);
- }
- check_inuse_chunk(m, newp);
- return chunk2mem(newp);
- }
- else {
- void* newmem = internal_malloc(m, bytes);
- if (newmem != 0) {
- size_t oc = oldsize - overhead_for(oldp);
- memcpy(newmem, oldmem, (oc < bytes)? oc : bytes);
- internal_free(m, oldmem);
- }
- return newmem;
- }
- }
- return 0;
-}
-
-/* --------------------------- memalign support -------------------------- */
-
-static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {
- if (alignment <= MALLOC_ALIGNMENT) /* Can just use malloc */
- return internal_malloc(m, bytes);
- if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */
- alignment = MIN_CHUNK_SIZE;
- if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */
- size_t a = MALLOC_ALIGNMENT << 1;
- while (a < alignment) a <<= 1;
- alignment = a;
- }
-
- if (bytes >= MAX_REQUEST - alignment) {
- if (m != 0) { /* Test isn't needed but avoids compiler warning */
- MALLOC_FAILURE_ACTION;
- }
- }
- else {
- size_t nb = request2size(bytes);
- size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;
- char* mem = (char*)internal_malloc(m, req);
- if (mem != 0) {
- void* leader = 0;
- void* trailer = 0;
- mchunkptr p = mem2chunk(mem);
-
- if (PREACTION(m)) return 0;
- if ((((size_t)(mem)) % alignment) != 0) { /* misaligned */
- /*
- Find an aligned spot inside chunk. Since we need to give
- back leading space in a chunk of at least MIN_CHUNK_SIZE, if
- the first calculation places us at a spot with less than
- MIN_CHUNK_SIZE leader, we can move to the next aligned spot.
- We've allocated enough total room so that this is always
- possible.
- */
- char* br = (char*)mem2chunk((size_t)(((size_t)(mem +
- alignment -
- SIZE_T_ONE)) &
- -alignment));
- char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?
- br : br+alignment;
- mchunkptr newp = (mchunkptr)pos;
- size_t leadsize = pos - (char*)(p);
- size_t newsize = chunksize(p) - leadsize;
-
- if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */
- newp->prev_foot = p->prev_foot + leadsize;
- newp->head = (newsize|CINUSE_BIT);
- }
- else { /* Otherwise, give back leader, use the rest */
- set_inuse(m, newp, newsize);
- set_inuse(m, p, leadsize);
- leader = chunk2mem(p);
- }
- p = newp;
- }
-
- /* Give back spare room at the end */
- if (!is_mmapped(p)) {
- size_t size = chunksize(p);
- if (size > nb + MIN_CHUNK_SIZE) {
- size_t remainder_size = size - nb;
- mchunkptr remainder = chunk_plus_offset(p, nb);
- set_inuse(m, p, nb);
- set_inuse(m, remainder, remainder_size);
- trailer = chunk2mem(remainder);
- }
- }
-
- assert (chunksize(p) >= nb);
- assert((((size_t)(chunk2mem(p))) % alignment) == 0);
- check_inuse_chunk(m, p);
- POSTACTION(m);
- if (leader != 0) {
- internal_free(m, leader);
- }
- if (trailer != 0) {
- internal_free(m, trailer);
- }
- return chunk2mem(p);
- }
- }
- return 0;
-}
-
-/* ------------------------ comalloc/coalloc support --------------------- */
-
-static void** ialloc(mstate m,
- size_t n_elements,
- size_t* sizes,
- int opts,
- void* chunks[]) {
- /*
- This provides common support for independent_X routines, handling
- all of the combinations that can result.
-
- The opts arg has:
- bit 0 set if all elements are same size (using sizes[0])
- bit 1 set if elements should be zeroed
- */
-
- size_t element_size; /* chunksize of each element, if all same */
- size_t contents_size; /* total size of elements */
- size_t array_size; /* request size of pointer array */
- void* mem; /* malloced aggregate space */
- mchunkptr p; /* corresponding chunk */
- size_t remainder_size; /* remaining bytes while splitting */
- void** marray; /* either "chunks" or malloced ptr array */
- mchunkptr array_chunk; /* chunk for malloced ptr array */
- flag_t was_enabled; /* to disable mmap */
- size_t size;
- size_t i;
-
- /* compute array length, if needed */
- if (chunks != 0) {
- if (n_elements == 0)
- return chunks; /* nothing to do */
- marray = chunks;
- array_size = 0;
- }
- else {
- /* if empty req, must still return chunk representing empty array */
- if (n_elements == 0)
- return (void**)internal_malloc(m, 0);
- marray = 0;
- array_size = request2size(n_elements * (sizeof(void*)));
- }
-
- /* compute total element size */
- if (opts & 0x1) { /* all-same-size */
- element_size = request2size(*sizes);
- contents_size = n_elements * element_size;
- }
- else { /* add up all the sizes */
- element_size = 0;
- contents_size = 0;
- for (i = 0; i != n_elements; ++i)
- contents_size += request2size(sizes[i]);
- }
-
- size = contents_size + array_size;
-
- /*
- Allocate the aggregate chunk. First disable direct-mmapping so
- malloc won't use it, since we would not be able to later
- free/realloc space internal to a segregated mmap region.
- */
- was_enabled = use_mmap(m);
- disable_mmap(m);
- mem = internal_malloc(m, size - CHUNK_OVERHEAD);
- if (was_enabled)
- enable_mmap(m);
- if (mem == 0)
- return 0;
-
- if (PREACTION(m)) return 0;
- p = mem2chunk(mem);
- remainder_size = chunksize(p);
-
- assert(!is_mmapped(p));
-
- if (opts & 0x2) { /* optionally clear the elements */
- memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);
- }
-
- /* If not provided, allocate the pointer array as final part of chunk */
- if (marray == 0) {
- size_t array_chunk_size;
- array_chunk = chunk_plus_offset(p, contents_size);
- array_chunk_size = remainder_size - contents_size;
- marray = (void**) (chunk2mem(array_chunk));
- set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);
- remainder_size = contents_size;
- }
-
- /* split out elements */
- for (i = 0; ; ++i) {
- marray[i] = chunk2mem(p);
- if (i != n_elements-1) {
- if (element_size != 0)
- size = element_size;
- else
- size = request2size(sizes[i]);
- remainder_size -= size;
- set_size_and_pinuse_of_inuse_chunk(m, p, size);
- p = chunk_plus_offset(p, size);
- }
- else { /* the final element absorbs any overallocation slop */
- set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);
- break;
- }
- }
-
-#if DEBUG
- if (marray != chunks) {
- /* final element must have exactly exhausted chunk */
- if (element_size != 0) {
- assert(remainder_size == element_size);
- }
- else {
- assert(remainder_size == request2size(sizes[i]));
- }
- check_inuse_chunk(m, mem2chunk(marray));
- }
- for (i = 0; i != n_elements; ++i)
- check_inuse_chunk(m, mem2chunk(marray[i]));
-
-#endif /* DEBUG */
-
- POSTACTION(m);
- return marray;
-}
-
-
-/* -------------------------- public routines ---------------------------- */
-
-#if !ONLY_MSPACES
-
-void* dlmalloc(size_t bytes) {
- /*
- Basic algorithm:
- If a small request (< 256 bytes minus per-chunk overhead):
- 1. If one exists, use a remainderless chunk in associated smallbin.
- (Remainderless means that there are too few excess bytes to
- represent as a chunk.)
- 2. If it is big enough, use the dv chunk, which is normally the
- chunk adjacent to the one used for the most recent small request.
- 3. If one exists, split the smallest available chunk in a bin,
- saving remainder in dv.
- 4. If it is big enough, use the top chunk.
- 5. If available, get memory from system and use it
- Otherwise, for a large request:
- 1. Find the smallest available binned chunk that fits, and use it
- if it is better fitting than dv chunk, splitting if necessary.
- 2. If better fitting than any binned chunk, use the dv chunk.
- 3. If it is big enough, use the top chunk.
- 4. If request size >= mmap threshold, try to directly mmap this chunk.
- 5. If available, get memory from system and use it
-
- The ugly goto's here ensure that postaction occurs along all paths.
- */
-
- if (!PREACTION(gm)) {
- void* mem;
- size_t nb;
- if (bytes <= MAX_SMALL_REQUEST) {
- bindex_t idx;
- binmap_t smallbits;
- nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
- idx = small_index(nb);
- smallbits = gm->smallmap >> idx;
-
- if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
- mchunkptr b, p;
- idx += ~smallbits & 1; /* Uses next bin if idx empty */
- b = smallbin_at(gm, idx);
- p = b->fd;
- assert(chunksize(p) == small_index2size(idx));
- unlink_first_small_chunk(gm, b, p, idx);
- set_inuse_and_pinuse(gm, p, small_index2size(idx));
- mem = chunk2mem(p);
- check_malloced_chunk(gm, mem, nb);
- goto postaction;
- }
-
- else if (nb > gm->dvsize) {
- if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
- mchunkptr b, p, r;
- size_t rsize;
- bindex_t i;
- binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
- binmap_t leastbit = least_bit(leftbits);
- compute_bit2idx(leastbit, i);
- b = smallbin_at(gm, i);
- p = b->fd;
- assert(chunksize(p) == small_index2size(i));
- unlink_first_small_chunk(gm, b, p, i);
- rsize = small_index2size(i) - nb;
- /* Fit here cannot be remainderless if 4byte sizes */
- if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
- set_inuse_and_pinuse(gm, p, small_index2size(i));
- else {
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
- r = chunk_plus_offset(p, nb);
- set_size_and_pinuse_of_free_chunk(r, rsize);
- replace_dv(gm, r, rsize);
- }
- mem = chunk2mem(p);
- check_malloced_chunk(gm, mem, nb);
- goto postaction;
- }
-
- else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {
- check_malloced_chunk(gm, mem, nb);
- goto postaction;
- }
- }
- }
- else if (bytes >= MAX_REQUEST)
- nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
- else {
- nb = pad_request(bytes);
- if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {
- check_malloced_chunk(gm, mem, nb);
- goto postaction;
- }
- }
-
- if (nb <= gm->dvsize) {
- size_t rsize = gm->dvsize - nb;
- mchunkptr p = gm->dv;
- if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
- mchunkptr r = gm->dv = chunk_plus_offset(p, nb);
- gm->dvsize = rsize;
- set_size_and_pinuse_of_free_chunk(r, rsize);
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
- }
- else { /* exhaust dv */
- size_t dvs = gm->dvsize;
- gm->dvsize = 0;
- gm->dv = 0;
- set_inuse_and_pinuse(gm, p, dvs);
- }
- mem = chunk2mem(p);
- check_malloced_chunk(gm, mem, nb);
- goto postaction;
- }
-
- else if (nb < gm->topsize) { /* Split top */
- size_t rsize = gm->topsize -= nb;
- mchunkptr p = gm->top;
- mchunkptr r = gm->top = chunk_plus_offset(p, nb);
- r->head = rsize | PINUSE_BIT;
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
- mem = chunk2mem(p);
- check_top_chunk(gm, gm->top);
- check_malloced_chunk(gm, mem, nb);
- goto postaction;
- }
-
- mem = sys_alloc(gm, nb);
-
- postaction:
- POSTACTION(gm);
- return mem;
- }
-
- return 0;
-}
-
-void dlfree(void* mem) {
- /*
- Consolidate freed chunks with preceeding or succeeding bordering
- free chunks, if they exist, and then place in a bin. Intermixed
- with special cases for top, dv, mmapped chunks, and usage errors.
- */
-
- if (mem != 0) {
- mchunkptr p = mem2chunk(mem);
-#if FOOTERS
- mstate fm = get_mstate_for(p);
- if (!ok_magic(fm)) {
- USAGE_ERROR_ACTION(fm, p);
- return;
- }
-#else /* FOOTERS */
-#define fm gm
-#endif /* FOOTERS */
- if (!PREACTION(fm)) {
- check_inuse_chunk(fm, p);
- if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) {
- size_t psize = chunksize(p);
- mchunkptr next = chunk_plus_offset(p, psize);
- if (!pinuse(p)) {
- size_t prevsize = p->prev_foot;
- if ((prevsize & IS_MMAPPED_BIT) != 0) {
- prevsize &= ~IS_MMAPPED_BIT;
- psize += prevsize + MMAP_FOOT_PAD;
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
- fm->footprint -= psize;
- goto postaction;
- }
- else {
- mchunkptr prev = chunk_minus_offset(p, prevsize);
- psize += prevsize;
- p = prev;
- if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
- if (p != fm->dv) {
- unlink_chunk(fm, p, prevsize);
- }
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {
- fm->dvsize = psize;
- set_free_with_pinuse(p, psize, next);
- goto postaction;
- }
- }
- else
- goto erroraction;
- }
- }
-
- if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
- if (!cinuse(next)) { /* consolidate forward */
- if (next == fm->top) {
- size_t tsize = fm->topsize += psize;
- fm->top = p;
- p->head = tsize | PINUSE_BIT;
- if (p == fm->dv) {
- fm->dv = 0;
- fm->dvsize = 0;
- }
- if (should_trim(fm, tsize))
- sys_trim(fm, 0);
- goto postaction;
- }
- else if (next == fm->dv) {
- size_t dsize = fm->dvsize += psize;
- fm->dv = p;
- set_size_and_pinuse_of_free_chunk(p, dsize);
- goto postaction;
- }
- else {
- size_t nsize = chunksize(next);
- psize += nsize;
- unlink_chunk(fm, next, nsize);
- set_size_and_pinuse_of_free_chunk(p, psize);
- if (p == fm->dv) {
- fm->dvsize = psize;
- goto postaction;
- }
- }
- }
- else
- set_free_with_pinuse(p, psize, next);
- insert_chunk(fm, p, psize);
- check_free_chunk(fm, p);
- goto postaction;
- }
- }
- erroraction:
- USAGE_ERROR_ACTION(fm, p);
- postaction:
- POSTACTION(fm);
- }
- }
-#if !FOOTERS
-#undef fm
-#endif /* FOOTERS */
-}
-
-void* dlcalloc(size_t n_elements, size_t elem_size) {
- void *mem;
- if (n_elements && MAX_SIZE_T / n_elements < elem_size) {
- /* Fail on overflow */
- MALLOC_FAILURE_ACTION;
- return NULL;
- }
- elem_size *= n_elements;
- mem = dlmalloc(elem_size);
- if (mem && calloc_must_clear(mem2chunk(mem)))
- memset(mem, 0, elem_size);
- return mem;
-}
-
-void* dlrealloc(void* oldmem, size_t bytes) {
- if (oldmem == 0)
- return dlmalloc(bytes);
-#ifdef REALLOC_ZERO_BYTES_FREES
- if (bytes == 0) {
- dlfree(oldmem);
- return 0;
- }
-#endif /* REALLOC_ZERO_BYTES_FREES */
- else {
-#if ! FOOTERS
- mstate m = gm;
-#else /* FOOTERS */
- mstate m = get_mstate_for(mem2chunk(oldmem));
- if (!ok_magic(m)) {
- USAGE_ERROR_ACTION(m, oldmem);
- return 0;
- }
-#endif /* FOOTERS */
- return internal_realloc(m, oldmem, bytes);
- }
-}
-
-void* dlmemalign(size_t alignment, size_t bytes) {
- return internal_memalign(gm, alignment, bytes);
-}
-
-void** dlindependent_calloc(size_t n_elements, size_t elem_size,
- void* chunks[]) {
- size_t sz = elem_size; /* serves as 1-element array */
- return ialloc(gm, n_elements, &sz, 3, chunks);
-}
-
-void** dlindependent_comalloc(size_t n_elements, size_t sizes[],
- void* chunks[]) {
- return ialloc(gm, n_elements, sizes, 0, chunks);
-}
-
-void* dlvalloc(size_t bytes) {
- size_t pagesz;
- init_mparams();
- pagesz = mparams.page_size;
- return dlmemalign(pagesz, bytes);
-}
-
-void* dlpvalloc(size_t bytes) {
- size_t pagesz;
- init_mparams();
- pagesz = mparams.page_size;
- return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));
-}
-
-int dlmalloc_trim(size_t pad) {
- int result = 0;
- if (!PREACTION(gm)) {
- result = sys_trim(gm, pad);
- POSTACTION(gm);
- }
- return result;
-}
-
-size_t dlmalloc_footprint(void) {
- return gm->footprint;
-}
-
-#if USE_MAX_ALLOWED_FOOTPRINT
-size_t dlmalloc_max_allowed_footprint(void) {
- return gm->max_allowed_footprint;
-}
-
-void dlmalloc_set_max_allowed_footprint(size_t bytes) {
- if (bytes > gm->footprint) {
- /* Increase the size in multiples of the granularity,
- * which is the smallest unit we request from the system.
- */
- gm->max_allowed_footprint = gm->footprint +
- granularity_align(bytes - gm->footprint);
- }
- else {
- //TODO: allow for reducing the max footprint
- gm->max_allowed_footprint = gm->footprint;
- }
-}
-#endif
-
-size_t dlmalloc_max_footprint(void) {
- return gm->max_footprint;
-}
-
-#if !NO_MALLINFO
-struct mallinfo dlmallinfo(void) {
- return internal_mallinfo(gm);
-}
-#endif /* NO_MALLINFO */
-
-void dlmalloc_stats() {
- internal_malloc_stats(gm);
-}
-
-size_t dlmalloc_usable_size(void* mem) {
- if (mem != 0) {
- mchunkptr p = mem2chunk(mem);
- if (cinuse(p))
- return chunksize(p) - overhead_for(p);
- }
- return 0;
-}
-
-int dlmallopt(int param_number, int value) {
- return change_mparam(param_number, value);
-}
-
-#endif /* !ONLY_MSPACES */
-
-/* ----------------------------- user mspaces ---------------------------- */
-
-#if MSPACES
-
-static mstate init_user_mstate(char* tbase, size_t tsize) {
- size_t msize = pad_request(sizeof(struct malloc_state));
- mchunkptr mn;
- mchunkptr msp = align_as_chunk(tbase);
- mstate m = (mstate)(chunk2mem(msp));
- memset(m, 0, msize);
- INITIAL_LOCK(&m->mutex);
- msp->head = (msize|PINUSE_BIT|CINUSE_BIT);
- m->seg.base = m->least_addr = tbase;
- m->seg.size = m->footprint = m->max_footprint = tsize;
-#if USE_MAX_ALLOWED_FOOTPRINT
- m->max_allowed_footprint = MAX_SIZE_T;
-#endif
- m->magic = mparams.magic;
- m->mflags = mparams.default_mflags;
- disable_contiguous(m);
- init_bins(m);
- mn = next_chunk(mem2chunk(m));
- init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);
- check_top_chunk(m, m->top);
- return m;
-}
-
-mspace create_mspace(size_t capacity, int locked) {
- mstate m = 0;
- size_t msize = pad_request(sizeof(struct malloc_state));
- init_mparams(); /* Ensure pagesize etc initialized */
-
- if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
- size_t rs = ((capacity == 0)? mparams.granularity :
- (capacity + TOP_FOOT_SIZE + msize));
- size_t tsize = granularity_align(rs);
- char* tbase = (char*)(CALL_MMAP(tsize));
- if (tbase != CMFAIL) {
- m = init_user_mstate(tbase, tsize);
- m->seg.sflags = IS_MMAPPED_BIT;
- set_lock(m, locked);
- }
- }
- return (mspace)m;
-}
-
-mspace create_mspace_with_base(void* base, size_t capacity, int locked) {
- mstate m = 0;
- size_t msize = pad_request(sizeof(struct malloc_state));
- init_mparams(); /* Ensure pagesize etc initialized */
-
- if (capacity > msize + TOP_FOOT_SIZE &&
- capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
- m = init_user_mstate((char*)base, capacity);
- m->seg.sflags = EXTERN_BIT;
- set_lock(m, locked);
- }
- return (mspace)m;
-}
-
-size_t destroy_mspace(mspace msp) {
- size_t freed = 0;
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- msegmentptr sp = &ms->seg;
- while (sp != 0) {
-#if HAVE_MMAP && HAVE_MREMAP
- char* base = sp->base;
-#endif
- size_t size = sp->size;
- flag_t flag = sp->sflags;
- sp = sp->next;
- if ((flag & IS_MMAPPED_BIT) && !(flag & EXTERN_BIT) &&
- CALL_MUNMAP(base, size) == 0)
- freed += size;
- }
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
- return freed;
-}
-
-/*
- mspace versions of routines are near-clones of the global
- versions. This is not so nice but better than the alternatives.
-*/
-
-
-void* mspace_malloc(mspace msp, size_t bytes) {
- mstate ms = (mstate)msp;
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- return 0;
- }
- if (!PREACTION(ms)) {
- void* mem;
- size_t nb;
- if (bytes <= MAX_SMALL_REQUEST) {
- bindex_t idx;
- binmap_t smallbits;
- nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
- idx = small_index(nb);
- smallbits = ms->smallmap >> idx;
-
- if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
- mchunkptr b, p;
- idx += ~smallbits & 1; /* Uses next bin if idx empty */
- b = smallbin_at(ms, idx);
- p = b->fd;
- assert(chunksize(p) == small_index2size(idx));
- unlink_first_small_chunk(ms, b, p, idx);
- set_inuse_and_pinuse(ms, p, small_index2size(idx));
- mem = chunk2mem(p);
- check_malloced_chunk(ms, mem, nb);
- goto postaction;
- }
-
- else if (nb > ms->dvsize) {
- if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
- mchunkptr b, p, r;
- size_t rsize;
- bindex_t i;
- binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
- binmap_t leastbit = least_bit(leftbits);
- compute_bit2idx(leastbit, i);
- b = smallbin_at(ms, i);
- p = b->fd;
- assert(chunksize(p) == small_index2size(i));
- unlink_first_small_chunk(ms, b, p, i);
- rsize = small_index2size(i) - nb;
- /* Fit here cannot be remainderless if 4byte sizes */
- if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
- set_inuse_and_pinuse(ms, p, small_index2size(i));
- else {
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
- r = chunk_plus_offset(p, nb);
- set_size_and_pinuse_of_free_chunk(r, rsize);
- replace_dv(ms, r, rsize);
- }
- mem = chunk2mem(p);
- check_malloced_chunk(ms, mem, nb);
- goto postaction;
- }
-
- else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
- check_malloced_chunk(ms, mem, nb);
- goto postaction;
- }
- }
- }
- else if (bytes >= MAX_REQUEST)
- nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
- else {
- nb = pad_request(bytes);
- if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {
- check_malloced_chunk(ms, mem, nb);
- goto postaction;
- }
- }
-
- if (nb <= ms->dvsize) {
- size_t rsize = ms->dvsize - nb;
- mchunkptr p = ms->dv;
- if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
- mchunkptr r = ms->dv = chunk_plus_offset(p, nb);
- ms->dvsize = rsize;
- set_size_and_pinuse_of_free_chunk(r, rsize);
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
- }
- else { /* exhaust dv */
- size_t dvs = ms->dvsize;
- ms->dvsize = 0;
- ms->dv = 0;
- set_inuse_and_pinuse(ms, p, dvs);
- }
- mem = chunk2mem(p);
- check_malloced_chunk(ms, mem, nb);
- goto postaction;
- }
-
- else if (nb < ms->topsize) { /* Split top */
- size_t rsize = ms->topsize -= nb;
- mchunkptr p = ms->top;
- mchunkptr r = ms->top = chunk_plus_offset(p, nb);
- r->head = rsize | PINUSE_BIT;
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
- mem = chunk2mem(p);
- check_top_chunk(ms, ms->top);
- check_malloced_chunk(ms, mem, nb);
- goto postaction;
- }
-
- mem = sys_alloc(ms, nb);
-
- postaction:
- POSTACTION(ms);
- return mem;
- }
-
- return 0;
-}
-
-void mspace_free(mspace msp, void* mem) {
- if (mem != 0) {
- mchunkptr p = mem2chunk(mem);
-#if FOOTERS
- mstate fm = get_mstate_for(p);
-#else /* FOOTERS */
- mstate fm = (mstate)msp;
-#endif /* FOOTERS */
- if (!ok_magic(fm)) {
- USAGE_ERROR_ACTION(fm, p);
- return;
- }
- if (!PREACTION(fm)) {
- check_inuse_chunk(fm, p);
- if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) {
- size_t psize = chunksize(p);
- mchunkptr next = chunk_plus_offset(p, psize);
- if (!pinuse(p)) {
- size_t prevsize = p->prev_foot;
- if ((prevsize & IS_MMAPPED_BIT) != 0) {
- prevsize &= ~IS_MMAPPED_BIT;
- psize += prevsize + MMAP_FOOT_PAD;
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
- fm->footprint -= psize;
- goto postaction;
- }
- else {
- mchunkptr prev = chunk_minus_offset(p, prevsize);
- psize += prevsize;
- p = prev;
- if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
- if (p != fm->dv) {
- unlink_chunk(fm, p, prevsize);
- }
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {
- fm->dvsize = psize;
- set_free_with_pinuse(p, psize, next);
- goto postaction;
- }
- }
- else
- goto erroraction;
- }
- }
-
- if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
- if (!cinuse(next)) { /* consolidate forward */
- if (next == fm->top) {
- size_t tsize = fm->topsize += psize;
- fm->top = p;
- p->head = tsize | PINUSE_BIT;
- if (p == fm->dv) {
- fm->dv = 0;
- fm->dvsize = 0;
- }
- if (should_trim(fm, tsize))
- sys_trim(fm, 0);
- goto postaction;
- }
- else if (next == fm->dv) {
- size_t dsize = fm->dvsize += psize;
- fm->dv = p;
- set_size_and_pinuse_of_free_chunk(p, dsize);
- goto postaction;
- }
- else {
- size_t nsize = chunksize(next);
- psize += nsize;
- unlink_chunk(fm, next, nsize);
- set_size_and_pinuse_of_free_chunk(p, psize);
- if (p == fm->dv) {
- fm->dvsize = psize;
- goto postaction;
- }
- }
- }
- else
- set_free_with_pinuse(p, psize, next);
- insert_chunk(fm, p, psize);
- check_free_chunk(fm, p);
- goto postaction;
- }
- }
- erroraction:
- USAGE_ERROR_ACTION(fm, p);
- postaction:
- POSTACTION(fm);
- }
- }
-}
-
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {
- void *mem;
- mstate ms = (mstate)msp;
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- return 0;
- }
- if (n_elements && MAX_SIZE_T / n_elements < elem_size) {
- /* Fail on overflow */
- MALLOC_FAILURE_ACTION;
- return NULL;
- }
- elem_size *= n_elements;
- mem = internal_malloc(ms, elem_size);
- if (mem && calloc_must_clear(mem2chunk(mem)))
- memset(mem, 0, elem_size);
- return mem;
-}
-
-void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {
- if (oldmem == 0)
- return mspace_malloc(msp, bytes);
-#ifdef REALLOC_ZERO_BYTES_FREES
- if (bytes == 0) {
- mspace_free(msp, oldmem);
- return 0;
- }
-#endif /* REALLOC_ZERO_BYTES_FREES */
- else {
-#if FOOTERS
- mchunkptr p = mem2chunk(oldmem);
- mstate ms = get_mstate_for(p);
-#else /* FOOTERS */
- mstate ms = (mstate)msp;
-#endif /* FOOTERS */
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- return 0;
- }
- return internal_realloc(ms, oldmem, bytes);
- }
-}
-
-#if ANDROID
-void* mspace_merge_objects(mspace msp, void* mema, void* memb)
-{
- /* PREACTION/POSTACTION aren't necessary because we are only
- modifying fields of inuse chunks owned by the current thread, in
- which case no other malloc operations can touch them.
- */
- if (mema == NULL || memb == NULL) {
- return NULL;
- }
- mchunkptr pa = mem2chunk(mema);
- mchunkptr pb = mem2chunk(memb);
-
-#if FOOTERS
- mstate fm = get_mstate_for(pa);
-#else /* FOOTERS */
- mstate fm = (mstate)msp;
-#endif /* FOOTERS */
- if (!ok_magic(fm)) {
- USAGE_ERROR_ACTION(fm, pa);
- return NULL;
- }
- check_inuse_chunk(fm, pa);
- if (RTCHECK(ok_address(fm, pa) && ok_cinuse(pa))) {
- if (next_chunk(pa) != pb) {
- /* Since pb may not be in fm, we can't check ok_address(fm, pb);
- since ok_cinuse(pb) would be unsafe before an address check,
- return NULL rather than invoke USAGE_ERROR_ACTION if pb is not
- in use or is a bogus address.
- */
- return NULL;
- }
- /* Since b follows a, they share the mspace. */
-#if FOOTERS
- assert(fm == get_mstate_for(pb));
-#endif /* FOOTERS */
- check_inuse_chunk(fm, pb);
- if (RTCHECK(ok_address(fm, pb) && ok_cinuse(pb))) {
- size_t sz = chunksize(pb);
- pa->head += sz;
- /* Make sure pa still passes. */
- check_inuse_chunk(fm, pa);
- return mema;
- }
- else {
- USAGE_ERROR_ACTION(fm, pb);
- return NULL;
- }
- }
- else {
- USAGE_ERROR_ACTION(fm, pa);
- return NULL;
- }
-}
-#endif /* ANDROID */
-
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {
- mstate ms = (mstate)msp;
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- return 0;
- }
- return internal_memalign(ms, alignment, bytes);
-}
-
-void** mspace_independent_calloc(mspace msp, size_t n_elements,
- size_t elem_size, void* chunks[]) {
- size_t sz = elem_size; /* serves as 1-element array */
- mstate ms = (mstate)msp;
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- return 0;
- }
- return ialloc(ms, n_elements, &sz, 3, chunks);
-}
-
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,
- size_t sizes[], void* chunks[]) {
- mstate ms = (mstate)msp;
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- return 0;
- }
- return ialloc(ms, n_elements, sizes, 0, chunks);
-}
-
-int mspace_trim(mspace msp, size_t pad) {
- int result = 0;
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- if (!PREACTION(ms)) {
- result = sys_trim(ms, pad);
- POSTACTION(ms);
- }
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
- return result;
-}
-
-void mspace_malloc_stats(mspace msp) {
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- internal_malloc_stats(ms);
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
-}
-
-size_t mspace_footprint(mspace msp) {
- size_t result;
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- result = ms->footprint;
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
- return result;
-}
-
-#if USE_MAX_ALLOWED_FOOTPRINT
-size_t mspace_max_allowed_footprint(mspace msp) {
- size_t result;
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- result = ms->max_allowed_footprint;
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
- return result;
-}
-
-void mspace_set_max_allowed_footprint(mspace msp, size_t bytes) {
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- if (bytes > ms->footprint) {
- /* Increase the size in multiples of the granularity,
- * which is the smallest unit we request from the system.
- */
- ms->max_allowed_footprint = ms->footprint +
- granularity_align(bytes - ms->footprint);
- }
- else {
- //TODO: allow for reducing the max footprint
- ms->max_allowed_footprint = ms->footprint;
- }
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
-}
-#endif
-
-size_t mspace_max_footprint(mspace msp) {
- size_t result;
- mstate ms = (mstate)msp;
- if (ok_magic(ms)) {
- result = ms->max_footprint;
- }
- else {
- USAGE_ERROR_ACTION(ms,ms);
- }
- return result;
-}
-
-
-#if !NO_MALLINFO
-struct mallinfo mspace_mallinfo(mspace msp) {
- mstate ms = (mstate)msp;
- if (!ok_magic(ms)) {
- USAGE_ERROR_ACTION(ms,ms);
- }
- return internal_mallinfo(ms);
-}
-#endif /* NO_MALLINFO */
-
-int mspace_mallopt(int param_number, int value) {
- return change_mparam(param_number, value);
-}
-
-#endif /* MSPACES */
-
-#if MSPACES && ONLY_MSPACES
-void mspace_walk_free_pages(mspace msp,
- void(*handler)(void *start, void *end, void *arg), void *harg)
-{
- mstate m = (mstate)msp;
- if (!ok_magic(m)) {
- USAGE_ERROR_ACTION(m,m);
- return;
- }
-#else
-void dlmalloc_walk_free_pages(void(*handler)(void *start, void *end, void *arg),
- void *harg)
-{
- mstate m = (mstate)gm;
-#endif
- if (!PREACTION(m)) {
- if (is_initialized(m)) {
- msegmentptr s = &m->seg;
- while (s != 0) {
- mchunkptr p = align_as_chunk(s->base);
- while (segment_holds(s, p) &&
- p != m->top && p->head != FENCEPOST_HEAD) {
- void *chunkptr;
- size_t chunklen;
- chunkptr = p;
- chunklen = chunksize(p);
- if (!cinuse(p)) {
- void *start;
- if (is_small(chunklen)) {
- start = (void *)(p + 1);
- }
- else {
- start = (void *)((tchunkptr)p + 1);
- }
- handler(start, next_chunk(p), harg);
- }
- p = next_chunk(p);
- }
- if (p == m->top) {
- handler((void *)(p + 1), next_chunk(p), harg);
- }
- s = s->next;
- }
- }
- POSTACTION(m);
- }
-}
-
-
-#if MSPACES && ONLY_MSPACES
-void mspace_walk_heap(mspace msp,
- void(*handler)(const void *chunkptr, size_t chunklen,
- const void *userptr, size_t userlen,
- void *arg),
- void *harg)
-{
- msegmentptr s;
- mstate m = (mstate)msp;
- if (!ok_magic(m)) {
- USAGE_ERROR_ACTION(m,m);
- return;
- }
-#else
-void dlmalloc_walk_heap(void(*handler)(const void *chunkptr, size_t chunklen,
- const void *userptr, size_t userlen,
- void *arg),
- void *harg)
-{
- msegmentptr s;
- mstate m = (mstate)gm;
-#endif
-
- s = &m->seg;
- while (s != 0) {
- mchunkptr p = align_as_chunk(s->base);
- while (segment_holds(s, p) &&
- p != m->top && p->head != FENCEPOST_HEAD) {
- void *chunkptr, *userptr;
- size_t chunklen, userlen;
- chunkptr = p;
- chunklen = chunksize(p);
- if (cinuse(p)) {
- userptr = chunk2mem(p);
- userlen = chunklen - overhead_for(p);
- }
- else {
- userptr = NULL;
- userlen = 0;
- }
- handler(chunkptr, chunklen, userptr, userlen, harg);
- p = next_chunk(p);
- }
- if (p == m->top) {
- /* The top chunk is just a big free chunk for our purposes.
- */
- handler(m->top, m->topsize, NULL, 0, harg);
- }
- s = s->next;
- }
-}
-
-/* -------------------- Alternative MORECORE functions ------------------- */
-
-/*
- Guidelines for creating a custom version of MORECORE:
-
- * For best performance, MORECORE should allocate in multiples of pagesize.
- * MORECORE may allocate more memory than requested. (Or even less,
- but this will usually result in a malloc failure.)
- * MORECORE must not allocate memory when given argument zero, but
- instead return one past the end address of memory from previous
- nonzero call.
- * For best performance, consecutive calls to MORECORE with positive
- arguments should return increasing addresses, indicating that
- space has been contiguously extended.
- * Even though consecutive calls to MORECORE need not return contiguous
- addresses, it must be OK for malloc'ed chunks to span multiple
- regions in those cases where they do happen to be contiguous.
- * MORECORE need not handle negative arguments -- it may instead
- just return MFAIL when given negative arguments.
- Negative arguments are always multiples of pagesize. MORECORE
- must not misinterpret negative args as large positive unsigned
- args. You can suppress all such calls from even occurring by defining
- MORECORE_CANNOT_TRIM,
-
- As an example alternative MORECORE, here is a custom allocator
- kindly contributed for pre-OSX macOS. It uses virtually but not
- necessarily physically contiguous non-paged memory (locked in,
- present and won't get swapped out). You can use it by uncommenting
- this section, adding some #includes, and setting up the appropriate
- defines above:
-
- #define MORECORE osMoreCore
-
- There is also a shutdown routine that should somehow be called for
- cleanup upon program exit.
-
- #define MAX_POOL_ENTRIES 100
- #define MINIMUM_MORECORE_SIZE (64 * 1024U)
- static int next_os_pool;
- void *our_os_pools[MAX_POOL_ENTRIES];
-
- void *osMoreCore(int size)
- {
- void *ptr = 0;
- static void *sbrk_top = 0;
-
- if (size > 0)
- {
- if (size < MINIMUM_MORECORE_SIZE)
- size = MINIMUM_MORECORE_SIZE;
- if (CurrentExecutionLevel() == kTaskLevel)
- ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);
- if (ptr == 0)
- {
- return (void *) MFAIL;
- }
- // save ptrs so they can be freed during cleanup
- our_os_pools[next_os_pool] = ptr;
- next_os_pool++;
- ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);
- sbrk_top = (char *) ptr + size;
- return ptr;
- }
- else if (size < 0)
- {
- // we don't currently support shrink behavior
- return (void *) MFAIL;
- }
- else
- {
- return sbrk_top;
- }
- }
-
- // cleanup any allocated memory pools
- // called as last thing before shutting down driver
-
- void osCleanupMem(void)
- {
- void **ptr;
-
- for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)
- if (*ptr)
- {
- PoolDeallocate(*ptr);
- *ptr = 0;
- }
- }
-
-*/
-
-
-/* -----------------------------------------------------------------------
-History:
- V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee)
- * Add max_footprint functions
- * Ensure all appropriate literals are size_t
- * Fix conditional compilation problem for some #define settings
- * Avoid concatenating segments with the one provided
- in create_mspace_with_base
- * Rename some variables to avoid compiler shadowing warnings
- * Use explicit lock initialization.
- * Better handling of sbrk interference.
- * Simplify and fix segment insertion, trimming and mspace_destroy
- * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x
- * Thanks especially to Dennis Flanagan for help on these.
-
- V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee)
- * Fix memalign brace error.
-
- V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee)
- * Fix improper #endif nesting in C++
- * Add explicit casts needed for C++
-
- V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee)
- * Use trees for large bins
- * Support mspaces
- * Use segments to unify sbrk-based and mmap-based system allocation,
- removing need for emulation on most platforms without sbrk.
- * Default safety checks
- * Optional footer checks. Thanks to William Robertson for the idea.
- * Internal code refactoring
- * Incorporate suggestions and platform-specific changes.
- Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,
- Aaron Bachmann, Emery Berger, and others.
- * Speed up non-fastbin processing enough to remove fastbins.
- * Remove useless cfree() to avoid conflicts with other apps.
- * Remove internal memcpy, memset. Compilers handle builtins better.
- * Remove some options that no one ever used and rename others.
-
- V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
- * Fix malloc_state bitmap array misdeclaration
-
- V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee)
- * Allow tuning of FIRST_SORTED_BIN_SIZE
- * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.
- * Better detection and support for non-contiguousness of MORECORE.
- Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger
- * Bypass most of malloc if no frees. Thanks To Emery Berger.
- * Fix freeing of old top non-contiguous chunk im sysmalloc.
- * Raised default trim and map thresholds to 256K.
- * Fix mmap-related #defines. Thanks to Lubos Lunak.
- * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.
- * Branch-free bin calculation
- * Default trim and mmap thresholds now 256K.
-
- V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee)
- * Introduce independent_comalloc and independent_calloc.
- Thanks to Michael Pachos for motivation and help.
- * Make optional .h file available
- * Allow > 2GB requests on 32bit systems.
- * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>.
- Thanks also to Andreas Mueller <a.mueller at paradatec.de>,
- and Anonymous.
- * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for
- helping test this.)
- * memalign: check alignment arg
- * realloc: don't try to shift chunks backwards, since this
- leads to more fragmentation in some programs and doesn't
- seem to help in any others.
- * Collect all cases in malloc requiring system memory into sysmalloc
- * Use mmap as backup to sbrk
- * Place all internal state in malloc_state
- * Introduce fastbins (although similar to 2.5.1)
- * Many minor tunings and cosmetic improvements
- * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK
- * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS
- Thanks to Tony E. Bennett <tbennett@nvidia.com> and others.
- * Include errno.h to support default failure action.
-
- V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee)
- * return null for negative arguments
- * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>
- * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'
- (e.g. WIN32 platforms)
- * Cleanup header file inclusion for WIN32 platforms
- * Cleanup code to avoid Microsoft Visual C++ compiler complaints
- * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing
- memory allocation routines
- * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)
- * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to
- usage of 'assert' in non-WIN32 code
- * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to
- avoid infinite loop
- * Always call 'fREe()' rather than 'free()'
-
- V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee)
- * Fixed ordering problem with boundary-stamping
-
- V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee)
- * Added pvalloc, as recommended by H.J. Liu
- * Added 64bit pointer support mainly from Wolfram Gloger
- * Added anonymously donated WIN32 sbrk emulation
- * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen
- * malloc_extend_top: fix mask error that caused wastage after
- foreign sbrks
- * Add linux mremap support code from HJ Liu
-
- V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee)
- * Integrated most documentation with the code.
- * Add support for mmap, with help from
- Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
- * Use last_remainder in more cases.
- * Pack bins using idea from colin@nyx10.cs.du.edu
- * Use ordered bins instead of best-fit threshhold
- * Eliminate block-local decls to simplify tracing and debugging.
- * Support another case of realloc via move into top
- * Fix error occuring when initial sbrk_base not word-aligned.
- * Rely on page size for units instead of SBRK_UNIT to
- avoid surprises about sbrk alignment conventions.
- * Add mallinfo, mallopt. Thanks to Raymond Nijssen
- (raymond@es.ele.tue.nl) for the suggestion.
- * Add `pad' argument to malloc_trim and top_pad mallopt parameter.
- * More precautions for cases where other routines call sbrk,
- courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
- * Added macros etc., allowing use in linux libc from
- H.J. Lu (hjl@gnu.ai.mit.edu)
- * Inverted this history list
-
- V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee)
- * Re-tuned and fixed to behave more nicely with V2.6.0 changes.
- * Removed all preallocation code since under current scheme
- the work required to undo bad preallocations exceeds
- the work saved in good cases for most test programs.
- * No longer use return list or unconsolidated bins since
- no scheme using them consistently outperforms those that don't
- given above changes.
- * Use best fit for very large chunks to prevent some worst-cases.
- * Added some support for debugging
-
- V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee)
- * Removed footers when chunks are in use. Thanks to
- Paul Wilson (wilson@cs.texas.edu) for the suggestion.
-
- V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee)
- * Added malloc_trim, with help from Wolfram Gloger
- (wmglo@Dent.MED.Uni-Muenchen.DE).
-
- V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g)
-
- V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g)
- * realloc: try to expand in both directions
- * malloc: swap order of clean-bin strategy;
- * realloc: only conditionally expand backwards
- * Try not to scavenge used bins
- * Use bin counts as a guide to preallocation
- * Occasionally bin return list chunks in first scan
- * Add a few optimizations from colin@nyx10.cs.du.edu
-
- V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g)
- * faster bin computation & slightly different binning
- * merged all consolidations to one part of malloc proper
- (eliminating old malloc_find_space & malloc_clean_bin)
- * Scan 2 returns chunks (not just 1)
- * Propagate failure in realloc if malloc returns 0
- * Add stuff to allow compilation on non-ANSI compilers
- from kpv@research.att.com
-
- V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu)
- * removed potential for odd address access in prev_chunk
- * removed dependency on getpagesize.h
- * misc cosmetics and a bit more internal documentation
- * anticosmetics: mangled names in macros to evade debugger strangeness
- * tested on sparc, hp-700, dec-mips, rs6000
- with gcc & native cc (hp, dec only) allowing
- Detlefs & Zorn comparison study (in SIGPLAN Notices.)
-
- Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu)
- * Based loosely on libg++-1.2X malloc. (It retains some of the overall
- structure of old version, but most details differ.)
-
-*/
+// Ugly inclusion of C file so that ART specific #defines configure dlmalloc
+#include "dlmalloc/malloc.c"
diff --git a/src/dlmalloc.h b/src/dlmalloc.h
index 1b642d2..892e930 100644
--- a/src/dlmalloc.h
+++ b/src/dlmalloc.h
@@ -1,655 +1,20 @@
-/*
- Default header file for malloc-2.8.x, written by Doug Lea
- and released to the public domain, as explained at
- http://creativecommons.org/licenses/publicdomain.
+// Copyright 2012 Google Inc. All Rights Reserved.
- last update: Mon Aug 15 08:55:52 2005 Doug Lea (dl at gee)
+#ifndef ART_SRC_DLMALLOC_H_
+#define ART_SRC_DLMALLOC_H_
- This header is for ANSI C/C++ only. You can set any of
- the following #defines before including:
+#define NO_MALLINFO 1
+#define HAVE_MMAP 0
+#define HAVE_MREMAP 0
+#define HAVE_MORECORE 1
+#define MSPACES 1
+#define ONLY_MSPACES 1
+#define USE_DL_PREFIX 1
+#define MALLOC_INSPECT_ALL 1
- * If USE_DL_PREFIX is defined, it is assumed that malloc.c
- was also compiled with this option, so all routines
- have names starting with "dl".
-
- * If HAVE_USR_INCLUDE_MALLOC_H is defined, it is assumed that this
- file will be #included AFTER <malloc.h>. This is needed only if
- your system defines a struct mallinfo that is incompatible with the
- standard one declared here. Otherwise, you can include this file
- INSTEAD of your system system <malloc.h>. At least on ANSI, all
- declarations should be compatible with system versions
-
- * If MSPACES is defined, declarations for mspace versions are included.
-*/
-
-#ifndef MALLOC_280_H
-#define MALLOC_280_H
-
-#ifdef __cplusplus
-extern "C" {
+// Only #include if we are not compiling dlmalloc.c (to avoid symbol redefinitions)
+#ifndef FOR_DLMALLOC_C
+#include "dlmalloc/malloc.h"
#endif
-#include <stddef.h> /* for size_t */
-
-#if !ONLY_MSPACES
-
-/* Check an additional macro for the five primary functions */
-#if !defined(USE_DL_PREFIX)
-#define dlcalloc calloc
-#define dlfree free
-#define dlmalloc malloc
-#define dlmemalign memalign
-#define dlrealloc realloc
-#endif
-
-#ifndef USE_DL_PREFIX
-#define dlvalloc valloc
-#define dlpvalloc pvalloc
-#define dlmallinfo mallinfo
-#define dlmallopt mallopt
-#define dlmalloc_trim malloc_trim
-#define dlmalloc_walk_free_pages \
- malloc_walk_free_pages
-#define dlmalloc_walk_heap \
- malloc_walk_heap
-#define dlmalloc_stats malloc_stats
-#define dlmalloc_usable_size malloc_usable_size
-#define dlmalloc_footprint malloc_footprint
-#define dlmalloc_max_allowed_footprint \
- malloc_max_allowed_footprint
-#define dlmalloc_set_max_allowed_footprint \
- malloc_set_max_allowed_footprint
-#define dlmalloc_max_footprint malloc_max_footprint
-#define dlindependent_calloc independent_calloc
-#define dlindependent_comalloc independent_comalloc
-#endif /* USE_DL_PREFIX */
-
-
-/*
- malloc(size_t n)
- Returns a pointer to a newly allocated chunk of at least n bytes, or
- null if no space is available, in which case errno is set to ENOMEM
- on ANSI C systems.
-
- If n is zero, malloc returns a minimum-sized chunk. (The minimum
- size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
- systems.) Note that size_t is an unsigned type, so calls with
- arguments that would be negative if signed are interpreted as
- requests for huge amounts of space, which will often fail. The
- maximum supported value of n differs across systems, but is in all
- cases less than the maximum representable value of a size_t.
-*/
-void* dlmalloc(size_t);
-
-/*
- free(void* p)
- Releases the chunk of memory pointed to by p, that had been previously
- allocated using malloc or a related routine such as realloc.
- It has no effect if p is null. If p was not malloced or already
- freed, free(p) will by default cuase the current program to abort.
-*/
-void dlfree(void*);
-
-/*
- calloc(size_t n_elements, size_t element_size);
- Returns a pointer to n_elements * element_size bytes, with all locations
- set to zero.
-*/
-void* dlcalloc(size_t, size_t);
-
-/*
- realloc(void* p, size_t n)
- Returns a pointer to a chunk of size n that contains the same data
- as does chunk p up to the minimum of (n, p's size) bytes, or null
- if no space is available.
-
- The returned pointer may or may not be the same as p. The algorithm
- prefers extending p in most cases when possible, otherwise it
- employs the equivalent of a malloc-copy-free sequence.
-
- If p is null, realloc is equivalent to malloc.
-
- If space is not available, realloc returns null, errno is set (if on
- ANSI) and p is NOT freed.
-
- if n is for fewer bytes than already held by p, the newly unused
- space is lopped off and freed if possible. realloc with a size
- argument of zero (re)allocates a minimum-sized chunk.
-
- The old unix realloc convention of allowing the last-free'd chunk
- to be used as an argument to realloc is not supported.
-*/
-
-void* dlrealloc(void*, size_t);
-
-/*
- memalign(size_t alignment, size_t n);
- Returns a pointer to a newly allocated chunk of n bytes, aligned
- in accord with the alignment argument.
-
- The alignment argument should be a power of two. If the argument is
- not a power of two, the nearest greater power is used.
- 8-byte alignment is guaranteed by normal malloc calls, so don't
- bother calling memalign with an argument of 8 or less.
-
- Overreliance on memalign is a sure way to fragment space.
-*/
-void* dlmemalign(size_t, size_t);
-
-/*
- valloc(size_t n);
- Equivalent to memalign(pagesize, n), where pagesize is the page
- size of the system. If the pagesize is unknown, 4096 is used.
-*/
-void* dlvalloc(size_t);
-
-/*
- mallopt(int parameter_number, int parameter_value)
- Sets tunable parameters The format is to provide a
- (parameter-number, parameter-value) pair. mallopt then sets the
- corresponding parameter to the argument value if it can (i.e., so
- long as the value is meaningful), and returns 1 if successful else
- 0. SVID/XPG/ANSI defines four standard param numbers for mallopt,
- normally defined in malloc.h. None of these are use in this malloc,
- so setting them has no effect. But this malloc also supports other
- options in mallopt:
-
- Symbol param # default allowed param values
- M_TRIM_THRESHOLD -1 2*1024*1024 any (-1U disables trimming)
- M_GRANULARITY -2 page size any power of 2 >= page size
- M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
-*/
-int dlmallopt(int, int);
-
-#define M_TRIM_THRESHOLD (-1)
-#define M_GRANULARITY (-2)
-#define M_MMAP_THRESHOLD (-3)
-
-
-/*
- malloc_footprint();
- Returns the number of bytes obtained from the system. The total
- number of bytes allocated by malloc, realloc etc., is less than this
- value. Unlike mallinfo, this function returns only a precomputed
- result, so can be called frequently to monitor memory consumption.
- Even if locks are otherwise defined, this function does not use them,
- so results might not be up to date.
-*/
-size_t dlmalloc_footprint();
-
-/*
- malloc_max_allowed_footprint();
- Returns the number of bytes that the heap is allowed to obtain
- from the system. malloc_footprint() should always return a
- size less than or equal to max_allowed_footprint, unless the
- max_allowed_footprint was set to a value smaller than the
- footprint at the time.
-
- This function is only available if dlmalloc.c was compiled
- with USE_MAX_ALLOWED_FOOTPRINT set.
-*/
-size_t dlmalloc_max_allowed_footprint();
-
-/*
- malloc_set_max_allowed_footprint();
- Set the maximum number of bytes that the heap is allowed to
- obtain from the system. The size will be rounded up to a whole
- page, and the rounded number will be returned from future calls
- to malloc_max_allowed_footprint(). If the new max_allowed_footprint
- is larger than the current footprint, the heap will never grow
- larger than max_allowed_footprint. If the new max_allowed_footprint
- is smaller than the current footprint, the heap will not grow
- further.
-
- This function is only available if dlmalloc.c was compiled
- with USE_MAX_ALLOWED_FOOTPRINT set.
-
- TODO: try to force the heap to give up memory in the shrink case,
- and update this comment once that happens.
-*/
-void dlmalloc_set_max_allowed_footprint(size_t bytes);
-
-/*
- malloc_max_footprint();
- Returns the maximum number of bytes obtained from the system. This
- value will be greater than current footprint if deallocated space
- has been reclaimed by the system. The peak number of bytes allocated
- by malloc, realloc etc., is less than this value. Unlike mallinfo,
- this function returns only a precomputed result, so can be called
- frequently to monitor memory consumption. Even if locks are
- otherwise defined, this function does not use them, so results might
- not be up to date.
-*/
-size_t dlmalloc_max_footprint(void);
-
-#if !NO_MALLINFO
-/*
- mallinfo()
- Returns (by copy) a struct containing various summary statistics:
-
- arena: current total non-mmapped bytes allocated from system
- ordblks: the number of free chunks
- smblks: always zero.
- hblks: current number of mmapped regions
- hblkhd: total bytes held in mmapped regions
- usmblks: the maximum total allocated space. This will be greater
- than current total if trimming has occurred.
- fsmblks: always zero
- uordblks: current total allocated space (normal or mmapped)
- fordblks: total free space
- keepcost: the maximum number of bytes that could ideally be released
- back to system via malloc_trim. ("ideally" means that
- it ignores page restrictions etc.)
-
- Because these fields are ints, but internal bookkeeping may
- be kept as longs, the reported values may wrap around zero and
- thus be inaccurate.
-*/
-#ifndef HAVE_USR_INCLUDE_MALLOC_H
-#ifndef _MALLOC_H_
-#ifndef MALLINFO_FIELD_TYPE
-#define MALLINFO_FIELD_TYPE size_t
-#endif /* MALLINFO_FIELD_TYPE */
-struct mallinfo {
- MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
- MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
- MALLINFO_FIELD_TYPE smblks; /* always 0 */
- MALLINFO_FIELD_TYPE hblks; /* always 0 */
- MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
- MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
- MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
- MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
- MALLINFO_FIELD_TYPE fordblks; /* total free space */
- MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
-};
-#endif /* _MALLOC_H_ */
-#endif /* HAVE_USR_INCLUDE_MALLOC_H */
-
-struct mallinfo dlmallinfo(void);
-#endif /* NO_MALLINFO */
-
-/*
- independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
-
- independent_calloc is similar to calloc, but instead of returning a
- single cleared space, it returns an array of pointers to n_elements
- independent elements that can hold contents of size elem_size, each
- of which starts out cleared, and can be independently freed,
- realloc'ed etc. The elements are guaranteed to be adjacently
- allocated (this is not guaranteed to occur with multiple callocs or
- mallocs), which may also improve cache locality in some
- applications.
-
- The "chunks" argument is optional (i.e., may be null, which is
- probably the most typical usage). If it is null, the returned array
- is itself dynamically allocated and should also be freed when it is
- no longer needed. Otherwise, the chunks array must be of at least
- n_elements in length. It is filled in with the pointers to the
- chunks.
-
- In either case, independent_calloc returns this pointer array, or
- null if the allocation failed. If n_elements is zero and "chunks"
- is null, it returns a chunk representing an array with zero elements
- (which should be freed if not wanted).
-
- Each element must be individually freed when it is no longer
- needed. If you'd like to instead be able to free all at once, you
- should instead use regular calloc and assign pointers into this
- space to represent elements. (In this case though, you cannot
- independently free elements.)
-
- independent_calloc simplifies and speeds up implementations of many
- kinds of pools. It may also be useful when constructing large data
- structures that initially have a fixed number of fixed-sized nodes,
- but the number is not known at compile time, and some of the nodes
- may later need to be freed. For example:
-
- struct Node { int item; struct Node* next; };
-
- struct Node* build_list() {
- struct Node** pool;
- int n = read_number_of_nodes_needed();
- if (n <= 0) return 0;
- pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
- if (pool == 0) die();
- // organize into a linked list...
- struct Node* first = pool[0];
- for (i = 0; i < n-1; ++i)
- pool[i]->next = pool[i+1];
- free(pool); // Can now free the array (or not, if it is needed later)
- return first;
- }
-*/
-void** dlindependent_calloc(size_t, size_t, void**);
-
-/*
- independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
-
- independent_comalloc allocates, all at once, a set of n_elements
- chunks with sizes indicated in the "sizes" array. It returns
- an array of pointers to these elements, each of which can be
- independently freed, realloc'ed etc. The elements are guaranteed to
- be adjacently allocated (this is not guaranteed to occur with
- multiple callocs or mallocs), which may also improve cache locality
- in some applications.
-
- The "chunks" argument is optional (i.e., may be null). If it is null
- the returned array is itself dynamically allocated and should also
- be freed when it is no longer needed. Otherwise, the chunks array
- must be of at least n_elements in length. It is filled in with the
- pointers to the chunks.
-
- In either case, independent_comalloc returns this pointer array, or
- null if the allocation failed. If n_elements is zero and chunks is
- null, it returns a chunk representing an array with zero elements
- (which should be freed if not wanted).
-
- Each element must be individually freed when it is no longer
- needed. If you'd like to instead be able to free all at once, you
- should instead use a single regular malloc, and assign pointers at
- particular offsets in the aggregate space. (In this case though, you
- cannot independently free elements.)
-
- independent_comallac differs from independent_calloc in that each
- element may have a different size, and also that it does not
- automatically clear elements.
-
- independent_comalloc can be used to speed up allocation in cases
- where several structs or objects must always be allocated at the
- same time. For example:
-
- struct Head { ... }
- struct Foot { ... }
-
- void send_message(char* msg) {
- int msglen = strlen(msg);
- size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
- void* chunks[3];
- if (independent_comalloc(3, sizes, chunks) == 0)
- die();
- struct Head* head = (struct Head*)(chunks[0]);
- char* body = (char*)(chunks[1]);
- struct Foot* foot = (struct Foot*)(chunks[2]);
- // ...
- }
-
- In general though, independent_comalloc is worth using only for
- larger values of n_elements. For small values, you probably won't
- detect enough difference from series of malloc calls to bother.
-
- Overuse of independent_comalloc can increase overall memory usage,
- since it cannot reuse existing noncontiguous small chunks that
- might be available for some of the elements.
-*/
-void** dlindependent_comalloc(size_t, size_t*, void**);
-
-
-/*
- pvalloc(size_t n);
- Equivalent to valloc(minimum-page-that-holds(n)), that is,
- round up n to nearest pagesize.
- */
-void* dlpvalloc(size_t);
-
-/*
- malloc_trim(size_t pad);
-
- If possible, gives memory back to the system (via negative arguments
- to sbrk) if there is unused memory at the `high' end of the malloc
- pool or in unused MMAP segments. You can call this after freeing
- large blocks of memory to potentially reduce the system-level memory
- requirements of a program. However, it cannot guarantee to reduce
- memory. Under some allocation patterns, some large free blocks of
- memory will be locked between two used chunks, so they cannot be
- given back to the system.
-
- The `pad' argument to malloc_trim represents the amount of free
- trailing space to leave untrimmed. If this argument is zero, only
- the minimum amount of memory to maintain internal data structures
- will be left. Non-zero arguments can be supplied to maintain enough
- trailing space to service future expected allocations without having
- to re-obtain memory from the system.
-
- Malloc_trim returns 1 if it actually released any memory, else 0.
-*/
-int dlmalloc_trim(size_t);
-
-/*
- malloc_walk_free_pages(handler, harg)
-
- Calls the provided handler on each free region in the heap. The
- memory between start and end are guaranteed not to contain any
- important data, so the handler is free to alter the contents
- in any way. This can be used to advise the OS that large free
- regions may be swapped out.
-
- The value in harg will be passed to each call of the handler.
- */
-void dlmalloc_walk_free_pages(void(*handler)(void *start, void *end, void *arg),
- void *harg);
-
-/*
- malloc_walk_heap(handler, harg)
-
- Calls the provided handler on each object or free region in the
- heap. The handler will receive the chunk pointer and length, the
- object pointer and length, and the value in harg on each call.
- */
-void dlmalloc_walk_heap(void(*handler)(const void *chunkptr, size_t chunklen,
- const void *userptr, size_t userlen,
- void *arg),
- void *harg);
-
-/*
- malloc_usable_size(void* p);
-
- Returns the number of bytes you can actually use in
- an allocated chunk, which may be more than you requested (although
- often not) due to alignment and minimum size constraints.
- You can use this many bytes without worrying about
- overwriting other allocated objects. This is not a particularly great
- programming practice. malloc_usable_size can be more useful in
- debugging and assertions, for example:
-
- p = malloc(n);
- assert(malloc_usable_size(p) >= 256);
-*/
-size_t dlmalloc_usable_size(void*);
-
-/*
- malloc_stats();
- Prints on stderr the amount of space obtained from the system (both
- via sbrk and mmap), the maximum amount (which may be more than
- current if malloc_trim and/or munmap got called), and the current
- number of bytes allocated via malloc (or realloc, etc) but not yet
- freed. Note that this is the number of bytes allocated, not the
- number requested. It will be larger than the number requested
- because of alignment and bookkeeping overhead. Because it includes
- alignment wastage as being in use, this figure may be greater than
- zero even when no user-level chunks are allocated.
-
- The reported current and maximum system memory can be inaccurate if
- a program makes other calls to system memory allocation functions
- (normally sbrk) outside of malloc.
-
- malloc_stats prints only the most commonly interesting statistics.
- More information can be obtained by calling mallinfo.
-*/
-void dlmalloc_stats();
-
-#endif /* !ONLY_MSPACES */
-
-#if MSPACES
-
-/*
- mspace is an opaque type representing an independent
- region of space that supports mspace_malloc, etc.
-*/
-typedef void* mspace;
-
-/*
- create_mspace creates and returns a new independent space with the
- given initial capacity, or, if 0, the default granularity size. It
- returns null if there is no system memory available to create the
- space. If argument locked is non-zero, the space uses a separate
- lock to control access. The capacity of the space will grow
- dynamically as needed to service mspace_malloc requests. You can
- control the sizes of incremental increases of this space by
- compiling with a different DEFAULT_GRANULARITY or dynamically
- setting with mallopt(M_GRANULARITY, value).
-*/
-mspace create_mspace(size_t capacity, int locked);
-
-/*
- destroy_mspace destroys the given space, and attempts to return all
- of its memory back to the system, returning the total number of
- bytes freed. After destruction, the results of access to all memory
- used by the space become undefined.
-*/
-size_t destroy_mspace(mspace msp);
-
-/*
- create_mspace_with_base uses the memory supplied as the initial base
- of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
- space is used for bookkeeping, so the capacity must be at least this
- large. (Otherwise 0 is returned.) When this initial space is
- exhausted, additional memory will be obtained from the system.
- Destroying this space will deallocate all additionally allocated
- space (if possible) but not the initial base.
-*/
-mspace create_mspace_with_base(void* base, size_t capacity, int locked);
-
-/*
- mspace_malloc behaves as malloc, but operates within
- the given space.
-*/
-void* mspace_malloc(mspace msp, size_t bytes);
-
-/*
- mspace_free behaves as free, but operates within
- the given space.
-
- If compiled with FOOTERS==1, mspace_free is not actually needed.
- free may be called instead of mspace_free because freed chunks from
- any space are handled by their originating spaces.
-*/
-void mspace_free(mspace msp, void* mem);
-
-/*
- mspace_realloc behaves as realloc, but operates within
- the given space.
-
- If compiled with FOOTERS==1, mspace_realloc is not actually
- needed. realloc may be called instead of mspace_realloc because
- realloced chunks from any space are handled by their originating
- spaces.
-*/
-void* mspace_realloc(mspace msp, void* mem, size_t newsize);
-
-/*
- mspace_merge_objects will merge allocated memory mema and memb
- together, provided memb immediately follows mema. It is roughly as
- if memb has been freed and mema has been realloced to a larger size.
- On successfully merging, mema will be returned. If either argument
- is null or memb does not immediately follow mema, null will be
- returned.
-
- Both mema and memb should have been previously allocated using
- malloc or a related routine such as realloc. If either mema or memb
- was not malloced or was previously freed, the result is undefined,
- but like mspace_free, the default is to abort the program.
-*/
-void* mspace_merge_objects(mspace msp, void* mema, void* memb);
-
-/*
- mspace_calloc behaves as calloc, but operates within
- the given space.
-*/
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
-
-/*
- mspace_memalign behaves as memalign, but operates within
- the given space.
-*/
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
-
-/*
- mspace_independent_calloc behaves as independent_calloc, but
- operates within the given space.
-*/
-void** mspace_independent_calloc(mspace msp, size_t n_elements,
- size_t elem_size, void* chunks[]);
-
-/*
- mspace_independent_comalloc behaves as independent_comalloc, but
- operates within the given space.
-*/
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,
- size_t sizes[], void* chunks[]);
-
-/*
- mspace_footprint() returns the number of bytes obtained from the
- system for this space.
-*/
-size_t mspace_footprint(mspace msp);
-
-/*
- mspace_max_allowed_footprint() returns the number of bytes that
- this space is allowed to obtain from the system. See
- malloc_max_allowed_footprint() for a more in-depth description.
-
- This function is only available if dlmalloc.c was compiled
- with USE_MAX_ALLOWED_FOOTPRINT set.
-*/
-size_t mspace_max_allowed_footprint(mspace msp);
-
-/*
- mspace_set_max_allowed_footprint() sets the maximum number of
- bytes (rounded up to a page) that this space is allowed to
- obtain from the system. See malloc_set_max_allowed_footprint()
- for a more in-depth description.
-
- This function is only available if dlmalloc.c was compiled
- with USE_MAX_ALLOWED_FOOTPRINT set.
-*/
-void mspace_set_max_allowed_footprint(mspace msp, size_t bytes);
-
-/*
- mspace_max_footprint() returns the maximum number of bytes obtained
- from the system over the lifetime of this space.
-*/
-size_t mspace_max_footprint(mspace msp);
-
-
-#if !NO_MALLINFO
-/*
- mspace_mallinfo behaves as mallinfo, but reports properties of
- the given space.
-*/
-struct mallinfo mspace_mallinfo(mspace msp);
-#endif /* NO_MALLINFO */
-
-/*
- mspace_malloc_stats behaves as malloc_stats, but reports
- properties of the given space.
-*/
-void mspace_malloc_stats(mspace msp);
-
-/*
- mspace_trim behaves as malloc_trim, but
- operates within the given space.
-*/
-int mspace_trim(mspace msp, size_t pad);
-
-/*
- An alias for mallopt.
-*/
-int mspace_mallopt(int, int);
-
-#endif /* MSPACES */
-
-#ifdef __cplusplus
-}; /* end of extern "C" */
-#endif
-
-#endif /* MALLOC_280_H */
+#endif // ART_SRC_DLMALLOC_H_
diff --git a/src/dlmalloc/malloc.c b/src/dlmalloc/malloc.c
new file mode 100644
index 0000000..b0192ac
--- /dev/null
+++ b/src/dlmalloc/malloc.c
@@ -0,0 +1,6256 @@
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain, as explained at
+ http://creativecommons.org/publicdomain/zero/1.0/ Send questions,
+ comments, complaints, performance data, etc to dl@cs.oswego.edu
+
+* Version 2.8.5 Sun May 22 10:26:02 2011 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+* Quickstart
+
+ This library is all in one file to simplify the most common usage:
+ ftp it, compile it (-O3), and link it into another program. All of
+ the compile-time options default to reasonable values for use on
+ most platforms. You might later want to step through various
+ compile-time and dynamic tuning options.
+
+ For convenience, an include file for code using this malloc is at:
+ ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.5.h
+ You don't really need this .h file unless you call functions not
+ defined in your system include files. The .h file contains only the
+ excerpts from this file needed for using this malloc on ANSI C/C++
+ systems, so long as you haven't changed compile-time options about
+ naming and tuning parameters. If you do, then you can create your
+ own malloc.h that does include all settings by cutting at the point
+ indicated below. Note that you may already by default be using a C
+ library containing a malloc that is based on some version of this
+ malloc (for example in linux). You might still want to use the one
+ in this file to customize settings or to avoid overheads associated
+ with library versions.
+
+* Vital statistics:
+
+ Supported pointer/size_t representation: 4 or 8 bytes
+ size_t MUST be an unsigned type of the same width as
+ pointers. (If you are using an ancient system that declares
+ size_t as a signed type, or need it to be a different width
+ than pointers, you can use a previous release of this malloc
+ (e.g. 2.7.2) supporting these.)
+
+ Alignment: 8 bytes (default)
+ This suffices for nearly all current machines and C compilers.
+ However, you can define MALLOC_ALIGNMENT to be wider than this
+ if necessary (up to 128bytes), at the expense of using more space.
+
+ Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes)
+ 8 or 16 bytes (if 8byte sizes)
+ Each malloced chunk has a hidden word of overhead holding size
+ and status information, and additional cross-check word
+ if FOOTERS is defined.
+
+ Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead)
+ 8-byte ptrs: 32 bytes (including overhead)
+
+ Even a request for zero bytes (i.e., malloc(0)) returns a
+ pointer to something of the minimum allocatable size.
+ The maximum overhead wastage (i.e., number of extra bytes
+ allocated than were requested in malloc) is less than or equal
+ to the minimum size, except for requests >= mmap_threshold that
+ are serviced via mmap(), where the worst case wastage is about
+ 32 bytes plus the remainder from a system page (the minimal
+ mmap unit); typically 4096 or 8192 bytes.
+
+ Security: static-safe; optionally more or less
+ The "security" of malloc refers to the ability of malicious
+ code to accentuate the effects of errors (for example, freeing
+ space that is not currently malloc'ed or overwriting past the
+ ends of chunks) in code that calls malloc. This malloc
+ guarantees not to modify any memory locations below the base of
+ heap, i.e., static variables, even in the presence of usage
+ errors. The routines additionally detect most improper frees
+ and reallocs. All this holds as long as the static bookkeeping
+ for malloc itself is not corrupted by some other means. This
+ is only one aspect of security -- these checks do not, and
+ cannot, detect all possible programming errors.
+
+ If FOOTERS is defined nonzero, then each allocated chunk
+ carries an additional check word to verify that it was malloced
+ from its space. These check words are the same within each
+ execution of a program using malloc, but differ across
+ executions, so externally crafted fake chunks cannot be
+ freed. This improves security by rejecting frees/reallocs that
+ could corrupt heap memory, in addition to the checks preventing
+ writes to statics that are always on. This may further improve
+ security at the expense of time and space overhead. (Note that
+ FOOTERS may also be worth using with MSPACES.)
+
+ By default detected errors cause the program to abort (calling
+ "abort()"). You can override this to instead proceed past
+ errors by defining PROCEED_ON_ERROR. In this case, a bad free
+ has no effect, and a malloc that encounters a bad address
+ caused by user overwrites will ignore the bad address by
+ dropping pointers and indices to all known memory. This may
+ be appropriate for programs that should continue if at all
+ possible in the face of programming errors, although they may
+ run out of memory because dropped memory is never reclaimed.
+
+ If you don't like either of these options, you can define
+ CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything
+ else. And if if you are sure that your program using malloc has
+ no errors or vulnerabilities, you can define INSECURE to 1,
+ which might (or might not) provide a small performance improvement.
+
+ It is also possible to limit the maximum total allocatable
+ space, using malloc_set_footprint_limit. This is not
+ designed as a security feature in itself (calls to set limits
+ are not screened or privileged), but may be useful as one
+ aspect of a secure implementation.
+
+ Thread-safety: NOT thread-safe unless USE_LOCKS defined non-zero
+ When USE_LOCKS is defined, each public call to malloc, free,
+ etc is surrounded with a lock. By default, this uses a plain
+ pthread mutex, win32 critical section, or a spin-lock if if
+ available for the platform and not disabled by setting
+ USE_SPIN_LOCKS=0. However, if USE_RECURSIVE_LOCKS is defined,
+ recursive versions are used instead (which are not required for
+ base functionality but may be needed in layered extensions).
+ Using a global lock is not especially fast, and can be a major
+ bottleneck. It is designed only to provide minimal protection
+ in concurrent environments, and to provide a basis for
+ extensions. If you are using malloc in a concurrent program,
+ consider instead using nedmalloc
+ (http://www.nedprod.com/programs/portable/nedmalloc/) or
+ ptmalloc (See http://www.malloc.de), which are derived from
+ versions of this malloc.
+
+ System requirements: Any combination of MORECORE and/or MMAP/MUNMAP
+ This malloc can use unix sbrk or any emulation (invoked using
+ the CALL_MORECORE macro) and/or mmap/munmap or any emulation
+ (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system
+ memory. On most unix systems, it tends to work best if both
+ MORECORE and MMAP are enabled. On Win32, it uses emulations
+ based on VirtualAlloc. It also uses common C library functions
+ like memset.
+
+ Compliance: I believe it is compliant with the Single Unix Specification
+ (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably
+ others as well.
+
+* Overview of algorithms
+
+ This is not the fastest, most space-conserving, most portable, or
+ most tunable malloc ever written. However it is among the fastest
+ while also being among the most space-conserving, portable and
+ tunable. Consistent balance across these factors results in a good
+ general-purpose allocator for malloc-intensive programs.
+
+ In most ways, this malloc is a best-fit allocator. Generally, it
+ chooses the best-fitting existing chunk for a request, with ties
+ broken in approximately least-recently-used order. (This strategy
+ normally maintains low fragmentation.) However, for requests less
+ than 256bytes, it deviates from best-fit when there is not an
+ exactly fitting available chunk by preferring to use space adjacent
+ to that used for the previous small request, as well as by breaking
+ ties in approximately most-recently-used order. (These enhance
+ locality of series of small allocations.) And for very large requests
+ (>= 256Kb by default), it relies on system memory mapping
+ facilities, if supported. (This helps avoid carrying around and
+ possibly fragmenting memory used only for large chunks.)
+
+ All operations (except malloc_stats and mallinfo) have execution
+ times that are bounded by a constant factor of the number of bits in
+ a size_t, not counting any clearing in calloc or copying in realloc,
+ or actions surrounding MORECORE and MMAP that have times
+ proportional to the number of non-contiguous regions returned by
+ system allocation routines, which is often just 1. In real-time
+ applications, you can optionally suppress segment traversals using
+ NO_SEGMENT_TRAVERSAL, which assures bounded execution even when
+ system allocators return non-contiguous spaces, at the typical
+ expense of carrying around more memory and increased fragmentation.
+
+ The implementation is not very modular and seriously overuses
+ macros. Perhaps someday all C compilers will do as good a job
+ inlining modular code as can now be done by brute-force expansion,
+ but now, enough of them seem not to.
+
+ Some compilers issue a lot of warnings about code that is
+ dead/unreachable only on some platforms, and also about intentional
+ uses of negation on unsigned types. All known cases of each can be
+ ignored.
+
+ For a longer but out of date high-level description, see
+ http://gee.cs.oswego.edu/dl/html/malloc.html
+
+* MSPACES
+ If MSPACES is defined, then in addition to malloc, free, etc.,
+ this file also defines mspace_malloc, mspace_free, etc. These
+ are versions of malloc routines that take an "mspace" argument
+ obtained using create_mspace, to control all internal bookkeeping.
+ If ONLY_MSPACES is defined, only these versions are compiled.
+ So if you would like to use this allocator for only some allocations,
+ and your system malloc for others, you can compile with
+ ONLY_MSPACES and then do something like...
+ static mspace mymspace = create_mspace(0,0); // for example
+ #define mymalloc(bytes) mspace_malloc(mymspace, bytes)
+
+ (Note: If you only need one instance of an mspace, you can instead
+ use "USE_DL_PREFIX" to relabel the global malloc.)
+
+ You can similarly create thread-local allocators by storing
+ mspaces as thread-locals. For example:
+ static __thread mspace tlms = 0;
+ void* tlmalloc(size_t bytes) {
+ if (tlms == 0) tlms = create_mspace(0, 0);
+ return mspace_malloc(tlms, bytes);
+ }
+ void tlfree(void* mem) { mspace_free(tlms, mem); }
+
+ Unless FOOTERS is defined, each mspace is completely independent.
+ You cannot allocate from one and free to another (although
+ conformance is only weakly checked, so usage errors are not always
+ caught). If FOOTERS is defined, then each chunk carries around a tag
+ indicating its originating mspace, and frees are directed to their
+ originating spaces. Normally, this requires use of locks.
+
+ ------------------------- Compile-time options ---------------------------
+
+Be careful in setting #define values for numerical constants of type
+size_t. On some systems, literal values are not automatically extended
+to size_t precision unless they are explicitly casted. You can also
+use the symbolic values MAX_SIZE_T, SIZE_T_ONE, etc below.
+
+WIN32 default: defined if _WIN32 defined
+ Defining WIN32 sets up defaults for MS environment and compilers.
+ Otherwise defaults are for unix. Beware that there seem to be some
+ cases where this malloc might not be a pure drop-in replacement for
+ Win32 malloc: Random-looking failures from Win32 GDI API's (eg;
+ SetDIBits()) may be due to bugs in some video driver implementations
+ when pixel buffers are malloc()ed, and the region spans more than
+ one VirtualAlloc()ed region. Because dlmalloc uses a small (64Kb)
+ default granularity, pixel buffers may straddle virtual allocation
+ regions more often than when using the Microsoft allocator. You can
+ avoid this by using VirtualAlloc() and VirtualFree() for all pixel
+ buffers rather than using malloc(). If this is not possible,
+ recompile this malloc with a larger DEFAULT_GRANULARITY. Note:
+ in cases where MSC and gcc (cygwin) are known to differ on WIN32,
+ conditions use _MSC_VER to distinguish them.
+
+DLMALLOC_EXPORT default: extern
+ Defines how public APIs are declared. If you want to export via a
+ Windows DLL, you might define this as
+ #define DLMALLOC_EXPORT extern __declspace(dllexport)
+ If you want a POSIX ELF shared object, you might use
+ #define DLMALLOC_EXPORT extern __attribute__((visibility("default")))
+
+MALLOC_ALIGNMENT default: (size_t)8
+ Controls the minimum alignment for malloc'ed chunks. It must be a
+ power of two and at least 8, even on machines for which smaller
+ alignments would suffice. It may be defined as larger than this
+ though. Note however that code and data structures are optimized for
+ the case of 8-byte alignment.
+
+MSPACES default: 0 (false)
+ If true, compile in support for independent allocation spaces.
+ This is only supported if HAVE_MMAP is true.
+
+ONLY_MSPACES default: 0 (false)
+ If true, only compile in mspace versions, not regular versions.
+
+USE_LOCKS default: 0 (false)
+ Causes each call to each public routine to be surrounded with
+ pthread or WIN32 mutex lock/unlock. (If set true, this can be
+ overridden on a per-mspace basis for mspace versions.) If set to a
+ non-zero value other than 1, locks are used, but their
+ implementation is left out, so lock functions must be supplied manually,
+ as described below.
+
+USE_SPIN_LOCKS default: 1 iff USE_LOCKS and spin locks available
+ If true, uses custom spin locks for locking. This is currently
+ supported only gcc >= 4.1, older gccs on x86 platforms, and recent
+ MS compilers. Otherwise, posix locks or win32 critical sections are
+ used.
+
+USE_RECURSIVE_LOCKS default: not defined
+ If defined nonzero, uses recursive (aka reentrant) locks, otherwise
+ uses plain mutexes. This is not required for malloc proper, but may
+ be needed for layered allocators such as nedmalloc.
+
+FOOTERS default: 0
+ If true, provide extra checking and dispatching by placing
+ information in the footers of allocated chunks. This adds
+ space and time overhead.
+
+INSECURE default: 0
+ If true, omit checks for usage errors and heap space overwrites.
+
+USE_DL_PREFIX default: NOT defined
+ Causes compiler to prefix all public routines with the string 'dl'.
+ This can be useful when you only want to use this malloc in one part
+ of a program, using your regular system malloc elsewhere.
+
+MALLOC_INSPECT_ALL default: NOT defined
+ If defined, compiles malloc_inspect_all and mspace_inspect_all, that
+ perform traversal of all heap space. Unless access to these
+ functions is otherwise restricted, you probably do not want to
+ include them in secure implementations.
+
+ABORT default: defined as abort()
+ Defines how to abort on failed checks. On most systems, a failed
+ check cannot die with an "assert" or even print an informative
+ message, because the underlying print routines in turn call malloc,
+ which will fail again. Generally, the best policy is to simply call
+ abort(). It's not very useful to do more than this because many
+ errors due to overwriting will show up as address faults (null, odd
+ addresses etc) rather than malloc-triggered checks, so will also
+ abort. Also, most compilers know that abort() does not return, so
+ can better optimize code conditionally calling it.
+
+PROCEED_ON_ERROR default: defined as 0 (false)
+ Controls whether detected bad addresses cause them to bypassed
+ rather than aborting. If set, detected bad arguments to free and
+ realloc are ignored. And all bookkeeping information is zeroed out
+ upon a detected overwrite of freed heap space, thus losing the
+ ability to ever return it from malloc again, but enabling the
+ application to proceed. If PROCEED_ON_ERROR is defined, the
+ static variable malloc_corruption_error_count is compiled in
+ and can be examined to see if errors have occurred. This option
+ generates slower code than the default abort policy.
+
+DEBUG default: NOT defined
+ The DEBUG setting is mainly intended for people trying to modify
+ this code or diagnose problems when porting to new platforms.
+ However, it may also be able to better isolate user errors than just
+ using runtime checks. The assertions in the check routines spell
+ out in more detail the assumptions and invariants underlying the
+ algorithms. The checking is fairly extensive, and will slow down
+ execution noticeably. Calling malloc_stats or mallinfo with DEBUG
+ set will attempt to check every non-mmapped allocated and free chunk
+ in the course of computing the summaries.
+
+ABORT_ON_ASSERT_FAILURE default: defined as 1 (true)
+ Debugging assertion failures can be nearly impossible if your
+ version of the assert macro causes malloc to be called, which will
+ lead to a cascade of further failures, blowing the runtime stack.
+ ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(),
+ which will usually make debugging easier.
+
+MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32
+ The action to take before "return 0" when malloc fails to be able to
+ return memory because there is none available.
+
+HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES
+ True if this system supports sbrk or an emulation of it.
+
+MORECORE default: sbrk
+ The name of the sbrk-style system routine to call to obtain more
+ memory. See below for guidance on writing custom MORECORE
+ functions. The type of the argument to sbrk/MORECORE varies across
+ systems. It cannot be size_t, because it supports negative
+ arguments, so it is normally the signed type of the same width as
+ size_t (sometimes declared as "intptr_t"). It doesn't much matter
+ though. Internally, we only call it with arguments less than half
+ the max value of a size_t, which should work across all reasonable
+ possibilities, although sometimes generating compiler warnings.
+
+MORECORE_CONTIGUOUS default: 1 (true) if HAVE_MORECORE
+ If true, take advantage of fact that consecutive calls to MORECORE
+ with positive arguments always return contiguous increasing
+ addresses. This is true of unix sbrk. It does not hurt too much to
+ set it true anyway, since malloc copes with non-contiguities.
+ Setting it false when definitely non-contiguous saves time
+ and possibly wasted space it would take to discover this though.
+
+MORECORE_CANNOT_TRIM default: NOT defined
+ True if MORECORE cannot release space back to the system when given
+ negative arguments. This is generally necessary only if you are
+ using a hand-crafted MORECORE function that cannot handle negative
+ arguments.
+
+NO_SEGMENT_TRAVERSAL default: 0
+ If non-zero, suppresses traversals of memory segments
+ returned by either MORECORE or CALL_MMAP. This disables
+ merging of segments that are contiguous, and selectively
+ releasing them to the OS if unused, but bounds execution times.
+
+HAVE_MMAP default: 1 (true)
+ True if this system supports mmap or an emulation of it. If so, and
+ HAVE_MORECORE is not true, MMAP is used for all system
+ allocation. If set and HAVE_MORECORE is true as well, MMAP is
+ primarily used to directly allocate very large blocks. It is also
+ used as a backup strategy in cases where MORECORE fails to provide
+ space from system. Note: A single call to MUNMAP is assumed to be
+ able to unmap memory that may have be allocated using multiple calls
+ to MMAP, so long as they are adjacent.
+
+HAVE_MREMAP default: 1 on linux, else 0
+ If true realloc() uses mremap() to re-allocate large blocks and
+ extend or shrink allocation spaces.
+
+MMAP_CLEARS default: 1 except on WINCE.
+ True if mmap clears memory so calloc doesn't need to. This is true
+ for standard unix mmap using /dev/zero and on WIN32 except for WINCE.
+
+USE_BUILTIN_FFS default: 0 (i.e., not used)
+ Causes malloc to use the builtin ffs() function to compute indices.
+ Some compilers may recognize and intrinsify ffs to be faster than the
+ supplied C version. Also, the case of x86 using gcc is special-cased
+ to an asm instruction, so is already as fast as it can be, and so
+ this setting has no effect. Similarly for Win32 under recent MS compilers.
+ (On most x86s, the asm version is only slightly faster than the C version.)
+
+malloc_getpagesize default: derive from system includes, or 4096.
+ The system page size. To the extent possible, this malloc manages
+ memory from the system in page-size units. This may be (and
+ usually is) a function rather than a constant. This is ignored
+ if WIN32, where page size is determined using getSystemInfo during
+ initialization.
+
+USE_DEV_RANDOM default: 0 (i.e., not used)
+ Causes malloc to use /dev/random to initialize secure magic seed for
+ stamping footers. Otherwise, the current time is used.
+
+NO_MALLINFO default: 0
+ If defined, don't compile "mallinfo". This can be a simple way
+ of dealing with mismatches between system declarations and
+ those in this file.
+
+MALLINFO_FIELD_TYPE default: size_t
+ The type of the fields in the mallinfo struct. This was originally
+ defined as "int" in SVID etc, but is more usefully defined as
+ size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set
+
+NO_MALLOC_STATS default: 0
+ If defined, don't compile "malloc_stats". This avoids calls to
+ fprintf and bringing in stdio dependencies you might not want.
+
+REALLOC_ZERO_BYTES_FREES default: not defined
+ This should be set if a call to realloc with zero bytes should
+ be the same as a call to free. Some people think it should. Otherwise,
+ since this malloc returns a unique pointer for malloc(0), so does
+ realloc(p, 0).
+
+LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H
+LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H
+LACKS_STDLIB_H LACKS_SCHED_H LACKS_TIME_H default: NOT defined unless on WIN32
+ Define these if your system does not have these header files.
+ You might need to manually insert some of the declarations they provide.
+
+DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS,
+ system_info.dwAllocationGranularity in WIN32,
+ otherwise 64K.
+ Also settable using mallopt(M_GRANULARITY, x)
+ The unit for allocating and deallocating memory from the system. On
+ most systems with contiguous MORECORE, there is no reason to
+ make this more than a page. However, systems with MMAP tend to
+ either require or encourage larger granularities. You can increase
+ this value to prevent system allocation functions to be called so
+ often, especially if they are slow. The value must be at least one
+ page and must be a power of two. Setting to 0 causes initialization
+ to either page size or win32 region size. (Note: In previous
+ versions of malloc, the equivalent of this option was called
+ "TOP_PAD")
+
+DEFAULT_TRIM_THRESHOLD default: 2MB
+ Also settable using mallopt(M_TRIM_THRESHOLD, x)
+ The maximum amount of unused top-most memory to keep before
+ releasing via malloc_trim in free(). Automatic trimming is mainly
+ useful in long-lived programs using contiguous MORECORE. Because
+ trimming via sbrk can be slow on some systems, and can sometimes be
+ wasteful (in cases where programs immediately afterward allocate
+ more large chunks) the value should be high enough so that your
+ overall system performance would improve by releasing this much
+ memory. As a rough guide, you might set to a value close to the
+ average size of a process (program) running on your system.
+ Releasing this much memory would allow such a process to run in
+ memory. Generally, it is worth tuning trim thresholds when a
+ program undergoes phases where several large chunks are allocated
+ and released in ways that can reuse each other's storage, perhaps
+ mixed with phases where there are no such chunks at all. The trim
+ value must be greater than page size to have any useful effect. To
+ disable trimming completely, you can set to MAX_SIZE_T. Note that the trick
+ some people use of mallocing a huge space and then freeing it at
+ program startup, in an attempt to reserve system memory, doesn't
+ have the intended effect under automatic trimming, since that memory
+ will immediately be returned to the system.
+
+DEFAULT_MMAP_THRESHOLD default: 256K
+ Also settable using mallopt(M_MMAP_THRESHOLD, x)
+ The request size threshold for using MMAP to directly service a
+ request. Requests of at least this size that cannot be allocated
+ using already-existing space will be serviced via mmap. (If enough
+ normal freed space already exists it is used instead.) Using mmap
+ segregates relatively large chunks of memory so that they can be
+ individually obtained and released from the host system. A request
+ serviced through mmap is never reused by any other request (at least
+ not directly; the system may just so happen to remap successive
+ requests to the same locations). Segregating space in this way has
+ the benefits that: Mmapped space can always be individually released
+ back to the system, which helps keep the system level memory demands
+ of a long-lived program low. Also, mapped memory doesn't become
+ `locked' between other chunks, as can happen with normally allocated
+ chunks, which means that even trimming via malloc_trim would not
+ release them. However, it has the disadvantage that the space
+ cannot be reclaimed, consolidated, and then used to service later
+ requests, as happens with normal chunks. The advantages of mmap
+ nearly always outweigh disadvantages for "large" chunks, but the
+ value of "large" may vary across systems. The default is an
+ empirically derived value that works well in most systems. You can
+ disable mmap by setting to MAX_SIZE_T.
+
+MAX_RELEASE_CHECK_RATE default: 4095 unless not HAVE_MMAP
+ The number of consolidated frees between checks to release
+ unused segments when freeing. When using non-contiguous segments,
+ especially with multiple mspaces, checking only for topmost space
+ doesn't always suffice to trigger trimming. To compensate for this,
+ free() will, with a period of MAX_RELEASE_CHECK_RATE (or the
+ current number of segments, if greater) try to release unused
+ segments to the OS when freeing chunks that result in
+ consolidation. The best value for this parameter is a compromise
+ between slowing down frees with relatively costly checks that
+ rarely trigger versus holding on to unused memory. To effectively
+ disable, set to MAX_SIZE_T. This may lead to a very slight speed
+ improvement at the expense of carrying around more memory.
+*/
+
+/* Version identifier to allow people to support multiple versions */
+#ifndef DLMALLOC_VERSION
+#define DLMALLOC_VERSION 20805
+#endif /* DLMALLOC_VERSION */
+
+#ifndef DLMALLOC_EXPORT
+#define DLMALLOC_EXPORT extern
+#endif
+
+#ifndef WIN32
+#ifdef _WIN32
+#define WIN32 1
+#endif /* _WIN32 */
+#ifdef _WIN32_WCE
+#define LACKS_FCNTL_H
+#define WIN32 1
+#endif /* _WIN32_WCE */
+#endif /* WIN32 */
+#ifdef WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <tchar.h>
+#define HAVE_MMAP 1
+#define HAVE_MORECORE 0
+#define LACKS_UNISTD_H
+#define LACKS_SYS_PARAM_H
+#define LACKS_SYS_MMAN_H
+#define LACKS_STRING_H
+#define LACKS_STRINGS_H
+#define LACKS_SYS_TYPES_H
+#define LACKS_ERRNO_H
+#define LACKS_SCHED_H
+#ifndef MALLOC_FAILURE_ACTION
+#define MALLOC_FAILURE_ACTION
+#endif /* MALLOC_FAILURE_ACTION */
+#ifndef MMAP_CLEARS
+#ifdef _WIN32_WCE /* WINCE reportedly does not clear */
+#define MMAP_CLEARS 0
+#else
+#define MMAP_CLEARS 1
+#endif /* _WIN32_WCE */
+#endif /*MMAP_CLEARS */
+#endif /* WIN32 */
+
+#if defined(DARWIN) || defined(_DARWIN)
+/* Mac OSX docs advise not to use sbrk; it seems better to use mmap */
+#ifndef HAVE_MORECORE
+#define HAVE_MORECORE 0
+#define HAVE_MMAP 1
+/* OSX allocators provide 16 byte alignment */
+#ifndef MALLOC_ALIGNMENT
+#define MALLOC_ALIGNMENT ((size_t)16U)
+#endif
+#endif /* HAVE_MORECORE */
+#endif /* DARWIN */
+
+#ifndef LACKS_SYS_TYPES_H
+#include <sys/types.h> /* For size_t */
+#endif /* LACKS_SYS_TYPES_H */
+
+/* The maximum possible size_t value has all bits set */
+#define MAX_SIZE_T (~(size_t)0)
+
+#ifndef USE_LOCKS /* ensure true if spin or recursive locks set */
+#define USE_LOCKS ((defined(USE_SPIN_LOCKS) && USE_SPIN_LOCKS != 0) || \
+ (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0))
+#endif /* USE_LOCKS */
+
+#if USE_LOCKS /* Spin locks for gcc >= 4.1, older gcc on x86, MSC >= 1310 */
+#if ((defined(__GNUC__) && \
+ ((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) || \
+ defined(__i386__) || defined(__x86_64__))) || \
+ (defined(_MSC_VER) && _MSC_VER>=1310))
+#ifndef USE_SPIN_LOCKS
+#define USE_SPIN_LOCKS 1
+#endif /* USE_SPIN_LOCKS */
+#elif USE_SPIN_LOCKS
+#error "USE_SPIN_LOCKS defined without implementation"
+#endif /* ... locks available... */
+#elif !defined(USE_SPIN_LOCKS)
+#define USE_SPIN_LOCKS 0
+#endif /* USE_LOCKS */
+
+#ifndef ONLY_MSPACES
+#define ONLY_MSPACES 0
+#endif /* ONLY_MSPACES */
+#ifndef MSPACES
+#if ONLY_MSPACES
+#define MSPACES 1
+#else /* ONLY_MSPACES */
+#define MSPACES 0
+#endif /* ONLY_MSPACES */
+#endif /* MSPACES */
+#ifndef MALLOC_ALIGNMENT
+#define MALLOC_ALIGNMENT ((size_t)8U)
+#endif /* MALLOC_ALIGNMENT */
+#ifndef FOOTERS
+#define FOOTERS 0
+#endif /* FOOTERS */
+#ifndef ABORT
+#define ABORT abort()
+#endif /* ABORT */
+#ifndef ABORT_ON_ASSERT_FAILURE
+#define ABORT_ON_ASSERT_FAILURE 1
+#endif /* ABORT_ON_ASSERT_FAILURE */
+#ifndef PROCEED_ON_ERROR
+#define PROCEED_ON_ERROR 0
+#endif /* PROCEED_ON_ERROR */
+
+#ifndef INSECURE
+#define INSECURE 0
+#endif /* INSECURE */
+#ifndef MALLOC_INSPECT_ALL
+#define MALLOC_INSPECT_ALL 0
+#endif /* MALLOC_INSPECT_ALL */
+#ifndef HAVE_MMAP
+#define HAVE_MMAP 1
+#endif /* HAVE_MMAP */
+#ifndef MMAP_CLEARS
+#define MMAP_CLEARS 1
+#endif /* MMAP_CLEARS */
+#ifndef HAVE_MREMAP
+#ifdef linux
+#define HAVE_MREMAP 1
+#define _GNU_SOURCE /* Turns on mremap() definition */
+#else /* linux */
+#define HAVE_MREMAP 0
+#endif /* linux */
+#endif /* HAVE_MREMAP */
+#ifndef MALLOC_FAILURE_ACTION
+#define MALLOC_FAILURE_ACTION errno = ENOMEM;
+#endif /* MALLOC_FAILURE_ACTION */
+#ifndef HAVE_MORECORE
+#if ONLY_MSPACES
+#define HAVE_MORECORE 0
+#else /* ONLY_MSPACES */
+#define HAVE_MORECORE 1
+#endif /* ONLY_MSPACES */
+#endif /* HAVE_MORECORE */
+#if !HAVE_MORECORE
+#define MORECORE_CONTIGUOUS 0
+#else /* !HAVE_MORECORE */
+#define MORECORE_DEFAULT sbrk
+#ifndef MORECORE_CONTIGUOUS
+#define MORECORE_CONTIGUOUS 1
+#endif /* MORECORE_CONTIGUOUS */
+#endif /* HAVE_MORECORE */
+#ifndef DEFAULT_GRANULARITY
+#if (MORECORE_CONTIGUOUS || defined(WIN32))
+#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */
+#else /* MORECORE_CONTIGUOUS */
+#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)
+#endif /* MORECORE_CONTIGUOUS */
+#endif /* DEFAULT_GRANULARITY */
+#ifndef DEFAULT_TRIM_THRESHOLD
+#ifndef MORECORE_CANNOT_TRIM
+#define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U)
+#else /* MORECORE_CANNOT_TRIM */
+#define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T
+#endif /* MORECORE_CANNOT_TRIM */
+#endif /* DEFAULT_TRIM_THRESHOLD */
+#ifndef DEFAULT_MMAP_THRESHOLD
+#if HAVE_MMAP
+#define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U)
+#else /* HAVE_MMAP */
+#define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T
+#endif /* HAVE_MMAP */
+#endif /* DEFAULT_MMAP_THRESHOLD */
+#ifndef MAX_RELEASE_CHECK_RATE
+#if HAVE_MMAP
+#define MAX_RELEASE_CHECK_RATE 4095
+#else
+#define MAX_RELEASE_CHECK_RATE MAX_SIZE_T
+#endif /* HAVE_MMAP */
+#endif /* MAX_RELEASE_CHECK_RATE */
+#ifndef USE_BUILTIN_FFS
+#define USE_BUILTIN_FFS 0
+#endif /* USE_BUILTIN_FFS */
+#ifndef USE_DEV_RANDOM
+#define USE_DEV_RANDOM 0
+#endif /* USE_DEV_RANDOM */
+#ifndef NO_MALLINFO
+#define NO_MALLINFO 0
+#endif /* NO_MALLINFO */
+#ifndef MALLINFO_FIELD_TYPE
+#define MALLINFO_FIELD_TYPE size_t
+#endif /* MALLINFO_FIELD_TYPE */
+#ifndef NO_MALLOC_STATS
+#define NO_MALLOC_STATS 0
+#endif /* NO_MALLOC_STATS */
+#ifndef NO_SEGMENT_TRAVERSAL
+#define NO_SEGMENT_TRAVERSAL 0
+#endif /* NO_SEGMENT_TRAVERSAL */
+
+/*
+ mallopt tuning options. SVID/XPG defines four standard parameter
+ numbers for mallopt, normally defined in malloc.h. None of these
+ are used in this malloc, so setting them has no effect. But this
+ malloc does support the following options.
+*/
+
+#define M_TRIM_THRESHOLD (-1)
+#define M_GRANULARITY (-2)
+#define M_MMAP_THRESHOLD (-3)
+
+/* ------------------------ Mallinfo declarations ------------------------ */
+
+#if !NO_MALLINFO
+/*
+ This version of malloc supports the standard SVID/XPG mallinfo
+ routine that returns a struct containing usage properties and
+ statistics. It should work on any system that has a
+ /usr/include/malloc.h defining struct mallinfo. The main
+ declaration needed is the mallinfo struct that is returned (by-copy)
+ by mallinfo(). The malloinfo struct contains a bunch of fields that
+ are not even meaningful in this version of malloc. These fields are
+ are instead filled by mallinfo() with other numbers that might be of
+ interest.
+
+ HAVE_USR_INCLUDE_MALLOC_H should be set if you have a
+ /usr/include/malloc.h file that includes a declaration of struct
+ mallinfo. If so, it is included; else a compliant version is
+ declared below. These must be precisely the same for mallinfo() to
+ work. The original SVID version of this struct, defined on most
+ systems with mallinfo, declares all fields as ints. But some others
+ define as unsigned long. If your system defines the fields using a
+ type of different width than listed here, you MUST #include your
+ system version and #define HAVE_USR_INCLUDE_MALLOC_H.
+*/
+
+/* #define HAVE_USR_INCLUDE_MALLOC_H */
+
+#ifdef HAVE_USR_INCLUDE_MALLOC_H
+#include "/usr/include/malloc.h"
+#else /* HAVE_USR_INCLUDE_MALLOC_H */
+#ifndef STRUCT_MALLINFO_DECLARED
+/* HP-UX (and others?) redefines mallinfo unless _STRUCT_MALLINFO is defined */
+#define _STRUCT_MALLINFO
+#define STRUCT_MALLINFO_DECLARED 1
+struct mallinfo {
+ MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
+ MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
+ MALLINFO_FIELD_TYPE smblks; /* always 0 */
+ MALLINFO_FIELD_TYPE hblks; /* always 0 */
+ MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
+ MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
+ MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
+ MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
+ MALLINFO_FIELD_TYPE fordblks; /* total free space */
+ MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
+};
+#endif /* STRUCT_MALLINFO_DECLARED */
+#endif /* HAVE_USR_INCLUDE_MALLOC_H */
+#endif /* NO_MALLINFO */
+
+/*
+ Try to persuade compilers to inline. The most critical functions for
+ inlining are defined as macros, so these aren't used for them.
+*/
+
+#ifndef FORCEINLINE
+ #if defined(__GNUC__)
+#define FORCEINLINE __inline __attribute__ ((always_inline))
+ #elif defined(_MSC_VER)
+ #define FORCEINLINE __forceinline
+ #endif
+#endif
+#ifndef NOINLINE
+ #if defined(__GNUC__)
+ #define NOINLINE __attribute__ ((noinline))
+ #elif defined(_MSC_VER)
+ #define NOINLINE __declspec(noinline)
+ #else
+ #define NOINLINE
+ #endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#ifndef FORCEINLINE
+ #define FORCEINLINE inline
+#endif
+#endif /* __cplusplus */
+#ifndef FORCEINLINE
+ #define FORCEINLINE
+#endif
+
+#if !ONLY_MSPACES
+
+/* ------------------- Declarations of public routines ------------------- */
+
+#ifndef USE_DL_PREFIX
+#define dlcalloc calloc
+#define dlfree free
+#define dlmalloc malloc
+#define dlmemalign memalign
+#define dlposix_memalign posix_memalign
+#define dlrealloc realloc
+#define dlrealloc_in_place realloc_in_place
+#define dlvalloc valloc
+#define dlpvalloc pvalloc
+#define dlmallinfo mallinfo
+#define dlmallopt mallopt
+#define dlmalloc_trim malloc_trim
+#define dlmalloc_stats malloc_stats
+#define dlmalloc_usable_size malloc_usable_size
+#define dlmalloc_footprint malloc_footprint
+#define dlmalloc_max_footprint malloc_max_footprint
+#define dlmalloc_footprint_limit malloc_footprint_limit
+#define dlmalloc_set_footprint_limit malloc_set_footprint_limit
+#define dlmalloc_inspect_all malloc_inspect_all
+#define dlindependent_calloc independent_calloc
+#define dlindependent_comalloc independent_comalloc
+#define dlbulk_free bulk_free
+#endif /* USE_DL_PREFIX */
+
+/*
+ malloc(size_t n)
+ Returns a pointer to a newly allocated chunk of at least n bytes, or
+ null if no space is available, in which case errno is set to ENOMEM
+ on ANSI C systems.
+
+ If n is zero, malloc returns a minimum-sized chunk. (The minimum
+ size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
+ systems.) Note that size_t is an unsigned type, so calls with
+ arguments that would be negative if signed are interpreted as
+ requests for huge amounts of space, which will often fail. The
+ maximum supported value of n differs across systems, but is in all
+ cases less than the maximum representable value of a size_t.
+*/
+DLMALLOC_EXPORT void* dlmalloc(size_t);
+
+/*
+ free(void* p)
+ Releases the chunk of memory pointed to by p, that had been previously
+ allocated using malloc or a related routine such as realloc.
+ It has no effect if p is null. If p was not malloced or already
+ freed, free(p) will by default cause the current program to abort.
+*/
+DLMALLOC_EXPORT void dlfree(void*);
+
+/*
+ calloc(size_t n_elements, size_t element_size);
+ Returns a pointer to n_elements * element_size bytes, with all locations
+ set to zero.
+*/
+DLMALLOC_EXPORT void* dlcalloc(size_t, size_t);
+
+/*
+ realloc(void* p, size_t n)
+ Returns a pointer to a chunk of size n that contains the same data
+ as does chunk p up to the minimum of (n, p's size) bytes, or null
+ if no space is available.
+
+ The returned pointer may or may not be the same as p. The algorithm
+ prefers extending p in most cases when possible, otherwise it
+ employs the equivalent of a malloc-copy-free sequence.
+
+ If p is null, realloc is equivalent to malloc.
+
+ If space is not available, realloc returns null, errno is set (if on
+ ANSI) and p is NOT freed.
+
+ if n is for fewer bytes than already held by p, the newly unused
+ space is lopped off and freed if possible. realloc with a size
+ argument of zero (re)allocates a minimum-sized chunk.
+
+ The old unix realloc convention of allowing the last-free'd chunk
+ to be used as an argument to realloc is not supported.
+*/
+DLMALLOC_EXPORT void* dlrealloc(void*, size_t);
+
+/*
+ realloc_in_place(void* p, size_t n)
+ Resizes the space allocated for p to size n, only if this can be
+ done without moving p (i.e., only if there is adjacent space
+ available if n is greater than p's current allocated size, or n is
+ less than or equal to p's size). This may be used instead of plain
+ realloc if an alternative allocation strategy is needed upon failure
+ to expand space; for example, reallocation of a buffer that must be
+ memory-aligned or cleared. You can use realloc_in_place to trigger
+ these alternatives only when needed.
+
+ Returns p if successful; otherwise null.
+*/
+DLMALLOC_EXPORT void* dlrealloc_in_place(void*, size_t);
+
+/*
+ memalign(size_t alignment, size_t n);
+ Returns a pointer to a newly allocated chunk of n bytes, aligned
+ in accord with the alignment argument.
+
+ The alignment argument should be a power of two. If the argument is
+ not a power of two, the nearest greater power is used.
+ 8-byte alignment is guaranteed by normal malloc calls, so don't
+ bother calling memalign with an argument of 8 or less.
+
+ Overreliance on memalign is a sure way to fragment space.
+*/
+DLMALLOC_EXPORT void* dlmemalign(size_t, size_t);
+
+/*
+ int posix_memalign(void** pp, size_t alignment, size_t n);
+ Allocates a chunk of n bytes, aligned in accord with the alignment
+ argument. Differs from memalign only in that it (1) assigns the
+ allocated memory to *pp rather than returning it, (2) fails and
+ returns EINVAL if the alignment is not a power of two (3) fails and
+ returns ENOMEM if memory cannot be allocated.
+*/
+DLMALLOC_EXPORT int dlposix_memalign(void**, size_t, size_t);
+
+/*
+ valloc(size_t n);
+ Equivalent to memalign(pagesize, n), where pagesize is the page
+ size of the system. If the pagesize is unknown, 4096 is used.
+*/
+DLMALLOC_EXPORT void* dlvalloc(size_t);
+
+/*
+ mallopt(int parameter_number, int parameter_value)
+ Sets tunable parameters The format is to provide a
+ (parameter-number, parameter-value) pair. mallopt then sets the
+ corresponding parameter to the argument value if it can (i.e., so
+ long as the value is meaningful), and returns 1 if successful else
+ 0. To workaround the fact that mallopt is specified to use int,
+ not size_t parameters, the value -1 is specially treated as the
+ maximum unsigned size_t value.
+
+ SVID/XPG/ANSI defines four standard param numbers for mallopt,
+ normally defined in malloc.h. None of these are use in this malloc,
+ so setting them has no effect. But this malloc also supports other
+ options in mallopt. See below for details. Briefly, supported
+ parameters are as follows (listed defaults are for "typical"
+ configurations).
+
+ Symbol param # default allowed param values
+ M_TRIM_THRESHOLD -1 2*1024*1024 any (-1 disables)
+ M_GRANULARITY -2 page size any power of 2 >= page size
+ M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
+*/
+DLMALLOC_EXPORT int dlmallopt(int, int);
+
+/*
+ malloc_footprint();
+ Returns the number of bytes obtained from the system. The total
+ number of bytes allocated by malloc, realloc etc., is less than this
+ value. Unlike mallinfo, this function returns only a precomputed
+ result, so can be called frequently to monitor memory consumption.
+ Even if locks are otherwise defined, this function does not use them,
+ so results might not be up to date.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_footprint(void);
+
+/*
+ malloc_max_footprint();
+ Returns the maximum number of bytes obtained from the system. This
+ value will be greater than current footprint if deallocated space
+ has been reclaimed by the system. The peak number of bytes allocated
+ by malloc, realloc etc., is less than this value. Unlike mallinfo,
+ this function returns only a precomputed result, so can be called
+ frequently to monitor memory consumption. Even if locks are
+ otherwise defined, this function does not use them, so results might
+ not be up to date.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_max_footprint(void);
+
+/*
+ malloc_footprint_limit();
+ Returns the number of bytes that the heap is allowed to obtain from
+ the system, returning the last value returned by
+ malloc_set_footprint_limit, or the maximum size_t value if
+ never set. The returned value reflects a permission. There is no
+ guarantee that this number of bytes can actually be obtained from
+ the system.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_footprint_limit();
+
+/*
+ malloc_set_footprint_limit();
+ Sets the maximum number of bytes to obtain from the system, causing
+ failure returns from malloc and related functions upon attempts to
+ exceed this value. The argument value may be subject to page
+ rounding to an enforceable limit; this actual value is returned.
+ Using an argument of the maximum possible size_t effectively
+ disables checks. If the argument is less than or equal to the
+ current malloc_footprint, then all future allocations that require
+ additional system memory will fail. However, invocation cannot
+ retroactively deallocate existing used memory.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_set_footprint_limit(size_t bytes);
+
+#if MALLOC_INSPECT_ALL
+/*
+ malloc_inspect_all(void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg);
+ Traverses the heap and calls the given handler for each managed
+ region, skipping all bytes that are (or may be) used for bookkeeping
+ purposes. Traversal does not include include chunks that have been
+ directly memory mapped. Each reported region begins at the start
+ address, and continues up to but not including the end address. The
+ first used_bytes of the region contain allocated data. If
+ used_bytes is zero, the region is unallocated. The handler is
+ invoked with the given callback argument. If locks are defined, they
+ are held during the entire traversal. It is a bad idea to invoke
+ other malloc functions from within the handler.
+
+ For example, to count the number of in-use chunks with size greater
+ than 1000, you could write:
+ static int count = 0;
+ void count_chunks(void* start, void* end, size_t used, void* arg) {
+ if (used >= 1000) ++count;
+ }
+ then:
+ malloc_inspect_all(count_chunks, NULL);
+
+ malloc_inspect_all is compiled only if MALLOC_INSPECT_ALL is defined.
+*/
+DLMALLOC_EXPORT void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*),
+ void* arg);
+
+#endif /* MALLOC_INSPECT_ALL */
+
+#if !NO_MALLINFO
+/*
+ mallinfo()
+ Returns (by copy) a struct containing various summary statistics:
+
+ arena: current total non-mmapped bytes allocated from system
+ ordblks: the number of free chunks
+ smblks: always zero.
+ hblks: current number of mmapped regions
+ hblkhd: total bytes held in mmapped regions
+ usmblks: the maximum total allocated space. This will be greater
+ than current total if trimming has occurred.
+ fsmblks: always zero
+ uordblks: current total allocated space (normal or mmapped)
+ fordblks: total free space
+ keepcost: the maximum number of bytes that could ideally be released
+ back to system via malloc_trim. ("ideally" means that
+ it ignores page restrictions etc.)
+
+ Because these fields are ints, but internal bookkeeping may
+ be kept as longs, the reported values may wrap around zero and
+ thus be inaccurate.
+*/
+DLMALLOC_EXPORT struct mallinfo dlmallinfo(void);
+#endif /* NO_MALLINFO */
+
+/*
+ independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
+
+ independent_calloc is similar to calloc, but instead of returning a
+ single cleared space, it returns an array of pointers to n_elements
+ independent elements that can hold contents of size elem_size, each
+ of which starts out cleared, and can be independently freed,
+ realloc'ed etc. The elements are guaranteed to be adjacently
+ allocated (this is not guaranteed to occur with multiple callocs or
+ mallocs), which may also improve cache locality in some
+ applications.
+
+ The "chunks" argument is optional (i.e., may be null, which is
+ probably the most typical usage). If it is null, the returned array
+ is itself dynamically allocated and should also be freed when it is
+ no longer needed. Otherwise, the chunks array must be of at least
+ n_elements in length. It is filled in with the pointers to the
+ chunks.
+
+ In either case, independent_calloc returns this pointer array, or
+ null if the allocation failed. If n_elements is zero and "chunks"
+ is null, it returns a chunk representing an array with zero elements
+ (which should be freed if not wanted).
+
+ Each element must be freed when it is no longer needed. This can be
+ done all at once using bulk_free.
+
+ independent_calloc simplifies and speeds up implementations of many
+ kinds of pools. It may also be useful when constructing large data
+ structures that initially have a fixed number of fixed-sized nodes,
+ but the number is not known at compile time, and some of the nodes
+ may later need to be freed. For example:
+
+ struct Node { int item; struct Node* next; };
+
+ struct Node* build_list() {
+ struct Node** pool;
+ int n = read_number_of_nodes_needed();
+ if (n <= 0) return 0;
+ pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
+ if (pool == 0) die();
+ // organize into a linked list...
+ struct Node* first = pool[0];
+ for (i = 0; i < n-1; ++i)
+ pool[i]->next = pool[i+1];
+ free(pool); // Can now free the array (or not, if it is needed later)
+ return first;
+ }
+*/
+DLMALLOC_EXPORT void** dlindependent_calloc(size_t, size_t, void**);
+
+/*
+ independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
+
+ independent_comalloc allocates, all at once, a set of n_elements
+ chunks with sizes indicated in the "sizes" array. It returns
+ an array of pointers to these elements, each of which can be
+ independently freed, realloc'ed etc. The elements are guaranteed to
+ be adjacently allocated (this is not guaranteed to occur with
+ multiple callocs or mallocs), which may also improve cache locality
+ in some applications.
+
+ The "chunks" argument is optional (i.e., may be null). If it is null
+ the returned array is itself dynamically allocated and should also
+ be freed when it is no longer needed. Otherwise, the chunks array
+ must be of at least n_elements in length. It is filled in with the
+ pointers to the chunks.
+
+ In either case, independent_comalloc returns this pointer array, or
+ null if the allocation failed. If n_elements is zero and chunks is
+ null, it returns a chunk representing an array with zero elements
+ (which should be freed if not wanted).
+
+ Each element must be freed when it is no longer needed. This can be
+ done all at once using bulk_free.
+
+ independent_comallac differs from independent_calloc in that each
+ element may have a different size, and also that it does not
+ automatically clear elements.
+
+ independent_comalloc can be used to speed up allocation in cases
+ where several structs or objects must always be allocated at the
+ same time. For example:
+
+ struct Head { ... }
+ struct Foot { ... }
+
+ void send_message(char* msg) {
+ int msglen = strlen(msg);
+ size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
+ void* chunks[3];
+ if (independent_comalloc(3, sizes, chunks) == 0)
+ die();
+ struct Head* head = (struct Head*)(chunks[0]);
+ char* body = (char*)(chunks[1]);
+ struct Foot* foot = (struct Foot*)(chunks[2]);
+ // ...
+ }
+
+ In general though, independent_comalloc is worth using only for
+ larger values of n_elements. For small values, you probably won't
+ detect enough difference from series of malloc calls to bother.
+
+ Overuse of independent_comalloc can increase overall memory usage,
+ since it cannot reuse existing noncontiguous small chunks that
+ might be available for some of the elements.
+*/
+DLMALLOC_EXPORT void** dlindependent_comalloc(size_t, size_t*, void**);
+
+/*
+ bulk_free(void* array[], size_t n_elements)
+ Frees and clears (sets to null) each non-null pointer in the given
+ array. This is likely to be faster than freeing them one-by-one.
+ If footers are used, pointers that have been allocated in different
+ mspaces are not freed or cleared, and the count of all such pointers
+ is returned. For large arrays of pointers with poor locality, it
+ may be worthwhile to sort this array before calling bulk_free.
+*/
+DLMALLOC_EXPORT size_t dlbulk_free(void**, size_t n_elements);
+
+/*
+ pvalloc(size_t n);
+ Equivalent to valloc(minimum-page-that-holds(n)), that is,
+ round up n to nearest pagesize.
+ */
+DLMALLOC_EXPORT void* dlpvalloc(size_t);
+
+/*
+ malloc_trim(size_t pad);
+
+ If possible, gives memory back to the system (via negative arguments
+ to sbrk) if there is unused memory at the `high' end of the malloc
+ pool or in unused MMAP segments. You can call this after freeing
+ large blocks of memory to potentially reduce the system-level memory
+ requirements of a program. However, it cannot guarantee to reduce
+ memory. Under some allocation patterns, some large free blocks of
+ memory will be locked between two used chunks, so they cannot be
+ given back to the system.
+
+ The `pad' argument to malloc_trim represents the amount of free
+ trailing space to leave untrimmed. If this argument is zero, only
+ the minimum amount of memory to maintain internal data structures
+ will be left. Non-zero arguments can be supplied to maintain enough
+ trailing space to service future expected allocations without having
+ to re-obtain memory from the system.
+
+ Malloc_trim returns 1 if it actually released any memory, else 0.
+*/
+DLMALLOC_EXPORT int dlmalloc_trim(size_t);
+
+/*
+ malloc_stats();
+ Prints on stderr the amount of space obtained from the system (both
+ via sbrk and mmap), the maximum amount (which may be more than
+ current if malloc_trim and/or munmap got called), and the current
+ number of bytes allocated via malloc (or realloc, etc) but not yet
+ freed. Note that this is the number of bytes allocated, not the
+ number requested. It will be larger than the number requested
+ because of alignment and bookkeeping overhead. Because it includes
+ alignment wastage as being in use, this figure may be greater than
+ zero even when no user-level chunks are allocated.
+
+ The reported current and maximum system memory can be inaccurate if
+ a program makes other calls to system memory allocation functions
+ (normally sbrk) outside of malloc.
+
+ malloc_stats prints only the most commonly interesting statistics.
+ More information can be obtained by calling mallinfo.
+*/
+DLMALLOC_EXPORT void dlmalloc_stats(void);
+
+#endif /* ONLY_MSPACES */
+
+/*
+ malloc_usable_size(void* p);
+
+ Returns the number of bytes you can actually use in
+ an allocated chunk, which may be more than you requested (although
+ often not) due to alignment and minimum size constraints.
+ You can use this many bytes without worrying about
+ overwriting other allocated objects. This is not a particularly great
+ programming practice. malloc_usable_size can be more useful in
+ debugging and assertions, for example:
+
+ p = malloc(n);
+ assert(malloc_usable_size(p) >= 256);
+*/
+size_t dlmalloc_usable_size(void*);
+
+#if MSPACES
+
+/*
+ mspace is an opaque type representing an independent
+ region of space that supports mspace_malloc, etc.
+*/
+typedef void* mspace;
+
+/*
+ create_mspace creates and returns a new independent space with the
+ given initial capacity, or, if 0, the default granularity size. It
+ returns null if there is no system memory available to create the
+ space. If argument locked is non-zero, the space uses a separate
+ lock to control access. The capacity of the space will grow
+ dynamically as needed to service mspace_malloc requests. You can
+ control the sizes of incremental increases of this space by
+ compiling with a different DEFAULT_GRANULARITY or dynamically
+ setting with mallopt(M_GRANULARITY, value).
+*/
+DLMALLOC_EXPORT mspace create_mspace(size_t capacity, int locked);
+
+/*
+ destroy_mspace destroys the given space, and attempts to return all
+ of its memory back to the system, returning the total number of
+ bytes freed. After destruction, the results of access to all memory
+ used by the space become undefined.
+*/
+DLMALLOC_EXPORT size_t destroy_mspace(mspace msp);
+
+/*
+ create_mspace_with_base uses the memory supplied as the initial base
+ of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
+ space is used for bookkeeping, so the capacity must be at least this
+ large. (Otherwise 0 is returned.) When this initial space is
+ exhausted, additional memory will be obtained from the system.
+ Destroying this space will deallocate all additionally allocated
+ space (if possible) but not the initial base.
+*/
+DLMALLOC_EXPORT mspace create_mspace_with_base(void* base, size_t capacity, int locked);
+
+/*
+ mspace_track_large_chunks controls whether requests for large chunks
+ are allocated in their own untracked mmapped regions, separate from
+ others in this mspace. By default large chunks are not tracked,
+ which reduces fragmentation. However, such chunks are not
+ necessarily released to the system upon destroy_mspace. Enabling
+ tracking by setting to true may increase fragmentation, but avoids
+ leakage when relying on destroy_mspace to release all memory
+ allocated using this space. The function returns the previous
+ setting.
+*/
+DLMALLOC_EXPORT int mspace_track_large_chunks(mspace msp, int enable);
+
+
+/*
+ mspace_malloc behaves as malloc, but operates within
+ the given space.
+*/
+DLMALLOC_EXPORT void* mspace_malloc(mspace msp, size_t bytes);
+
+/*
+ mspace_free behaves as free, but operates within
+ the given space.
+
+ If compiled with FOOTERS==1, mspace_free is not actually needed.
+ free may be called instead of mspace_free because freed chunks from
+ any space are handled by their originating spaces.
+*/
+DLMALLOC_EXPORT void mspace_free(mspace msp, void* mem);
+
+/*
+ mspace_realloc behaves as realloc, but operates within
+ the given space.
+
+ If compiled with FOOTERS==1, mspace_realloc is not actually
+ needed. realloc may be called instead of mspace_realloc because
+ realloced chunks from any space are handled by their originating
+ spaces.
+*/
+DLMALLOC_EXPORT void* mspace_realloc(mspace msp, void* mem, size_t newsize);
+
+/*
+ mspace_calloc behaves as calloc, but operates within
+ the given space.
+*/
+DLMALLOC_EXPORT void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
+
+/*
+ mspace_memalign behaves as memalign, but operates within
+ the given space.
+*/
+DLMALLOC_EXPORT void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
+
+/*
+ mspace_independent_calloc behaves as independent_calloc, but
+ operates within the given space.
+*/
+DLMALLOC_EXPORT void** mspace_independent_calloc(mspace msp, size_t n_elements,
+ size_t elem_size, void* chunks[]);
+
+/*
+ mspace_independent_comalloc behaves as independent_comalloc, but
+ operates within the given space.
+*/
+DLMALLOC_EXPORT void** mspace_independent_comalloc(mspace msp, size_t n_elements,
+ size_t sizes[], void* chunks[]);
+
+/*
+ mspace_footprint() returns the number of bytes obtained from the
+ system for this space.
+*/
+DLMALLOC_EXPORT size_t mspace_footprint(mspace msp);
+
+/*
+ mspace_max_footprint() returns the peak number of bytes obtained from the
+ system for this space.
+*/
+DLMALLOC_EXPORT size_t mspace_max_footprint(mspace msp);
+
+
+#if !NO_MALLINFO
+/*
+ mspace_mallinfo behaves as mallinfo, but reports properties of
+ the given space.
+*/
+DLMALLOC_EXPORT struct mallinfo mspace_mallinfo(mspace msp);
+#endif /* NO_MALLINFO */
+
+/*
+ malloc_usable_size(void* p) behaves the same as malloc_usable_size;
+*/
+DLMALLOC_EXPORT size_t mspace_usable_size(void* mem);
+
+/*
+ mspace_malloc_stats behaves as malloc_stats, but reports
+ properties of the given space.
+*/
+DLMALLOC_EXPORT void mspace_malloc_stats(mspace msp);
+
+/*
+ mspace_trim behaves as malloc_trim, but
+ operates within the given space.
+*/
+DLMALLOC_EXPORT int mspace_trim(mspace msp, size_t pad);
+
+/*
+ An alias for mallopt.
+*/
+DLMALLOC_EXPORT int mspace_mallopt(int, int);
+
+#endif /* MSPACES */
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif /* __cplusplus */
+
+/*
+ ========================================================================
+ To make a fully customizable malloc.h header file, cut everything
+ above this line, put into file malloc.h, edit to suit, and #include it
+ on the next line, as well as in programs that use this malloc.
+ ========================================================================
+*/
+
+/* #include "malloc.h" */
+
+/*------------------------------ internal #includes ---------------------- */
+
+#ifdef _MSC_VER
+#pragma warning( disable : 4146 ) /* no "unsigned" warnings */
+#endif /* _MSC_VER */
+#if !NO_MALLOC_STATS
+#include <stdio.h> /* for printing in malloc_stats */
+#endif /* NO_MALLOC_STATS */
+#ifndef LACKS_ERRNO_H
+#include <errno.h> /* for MALLOC_FAILURE_ACTION */
+#endif /* LACKS_ERRNO_H */
+#ifdef DEBUG
+#if ABORT_ON_ASSERT_FAILURE
+#undef assert
+#define assert(x) if(!(x)) ABORT
+#else /* ABORT_ON_ASSERT_FAILURE */
+#include <assert.h>
+#endif /* ABORT_ON_ASSERT_FAILURE */
+#else /* DEBUG */
+#ifndef assert
+#define assert(x)
+#endif
+#define DEBUG 0
+#endif /* DEBUG */
+#if !defined(WIN32) && !defined(LACKS_TIME_H)
+#include <time.h> /* for magic initialization */
+#endif /* WIN32 */
+#ifndef LACKS_STDLIB_H
+#include <stdlib.h> /* for abort() */
+#endif /* LACKS_STDLIB_H */
+#ifndef LACKS_STRING_H
+#include <string.h> /* for memset etc */
+#endif /* LACKS_STRING_H */
+#if USE_BUILTIN_FFS
+#ifndef LACKS_STRINGS_H
+#include <strings.h> /* for ffs */
+#endif /* LACKS_STRINGS_H */
+#endif /* USE_BUILTIN_FFS */
+#if HAVE_MMAP
+#ifndef LACKS_SYS_MMAN_H
+/* On some versions of linux, mremap decl in mman.h needs __USE_GNU set */
+#if (defined(linux) && !defined(__USE_GNU))
+#define __USE_GNU 1
+#include <sys/mman.h> /* for mmap */
+#undef __USE_GNU
+#else
+#include <sys/mman.h> /* for mmap */
+#endif /* linux */
+#endif /* LACKS_SYS_MMAN_H */
+#ifndef LACKS_FCNTL_H
+#include <fcntl.h>
+#endif /* LACKS_FCNTL_H */
+#endif /* HAVE_MMAP */
+#ifndef LACKS_UNISTD_H
+#include <unistd.h> /* for sbrk, sysconf */
+#else /* LACKS_UNISTD_H */
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
+extern void* sbrk(ptrdiff_t);
+#endif /* FreeBSD etc */
+#endif /* LACKS_UNISTD_H */
+
+/* Declarations for locking */
+#if USE_LOCKS
+#ifndef WIN32
+#if defined (__SVR4) && defined (__sun) /* solaris */
+#include <thread.h>
+#elif !defined(LACKS_SCHED_H)
+#include <sched.h>
+#endif /* solaris or LACKS_SCHED_H */
+#if (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0) || !USE_SPIN_LOCKS
+#include <pthread.h>
+#endif /* USE_RECURSIVE_LOCKS ... */
+#elif defined(_MSC_VER)
+#ifndef _M_AMD64
+/* These are already defined on AMD64 builds */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+LONG __cdecl _InterlockedCompareExchange(LONG volatile *Dest, LONG Exchange, LONG Comp);
+LONG __cdecl _InterlockedExchange(LONG volatile *Target, LONG Value);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* _M_AMD64 */
+#pragma intrinsic (_InterlockedCompareExchange)
+#pragma intrinsic (_InterlockedExchange)
+#define interlockedcompareexchange _InterlockedCompareExchange
+#define interlockedexchange _InterlockedExchange
+#elif defined(WIN32) && defined(__GNUC__)
+#define interlockedcompareexchange(a, b, c) __sync_val_compare_and_swap(a, c, b)
+#define interlockedexchange __sync_lock_test_and_set
+#endif /* Win32 */
+#endif /* USE_LOCKS */
+
+/* Declarations for bit scanning on win32 */
+#if defined(_MSC_VER) && _MSC_VER>=1300
+#ifndef BitScanForward /* Try to avoid pulling in WinNT.h */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+unsigned char _BitScanForward(unsigned long *index, unsigned long mask);
+unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#define BitScanForward _BitScanForward
+#define BitScanReverse _BitScanReverse
+#pragma intrinsic(_BitScanForward)
+#pragma intrinsic(_BitScanReverse)
+#endif /* BitScanForward */
+#endif /* defined(_MSC_VER) && _MSC_VER>=1300 */
+
+#ifndef WIN32
+#ifndef malloc_getpagesize
+# ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */
+# ifndef _SC_PAGE_SIZE
+# define _SC_PAGE_SIZE _SC_PAGESIZE
+# endif
+# endif
+# ifdef _SC_PAGE_SIZE
+# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
+# else
+# if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)
+ extern size_t getpagesize();
+# define malloc_getpagesize getpagesize()
+# else
+# ifdef WIN32 /* use supplied emulation of getpagesize */
+# define malloc_getpagesize getpagesize()
+# else
+# ifndef LACKS_SYS_PARAM_H
+# include <sys/param.h>
+# endif
+# ifdef EXEC_PAGESIZE
+# define malloc_getpagesize EXEC_PAGESIZE
+# else
+# ifdef NBPG
+# ifndef CLSIZE
+# define malloc_getpagesize NBPG
+# else
+# define malloc_getpagesize (NBPG * CLSIZE)
+# endif
+# else
+# ifdef NBPC
+# define malloc_getpagesize NBPC
+# else
+# ifdef PAGESIZE
+# define malloc_getpagesize PAGESIZE
+# else /* just guess */
+# define malloc_getpagesize ((size_t)4096U)
+# endif
+# endif
+# endif
+# endif
+# endif
+# endif
+# endif
+#endif
+#endif
+
+/* ------------------- size_t and alignment properties -------------------- */
+
+/* The byte and bit size of a size_t */
+#define SIZE_T_SIZE (sizeof(size_t))
+#define SIZE_T_BITSIZE (sizeof(size_t) << 3)
+
+/* Some constants coerced to size_t */
+/* Annoying but necessary to avoid errors on some platforms */
+#define SIZE_T_ZERO ((size_t)0)
+#define SIZE_T_ONE ((size_t)1)
+#define SIZE_T_TWO ((size_t)2)
+#define SIZE_T_FOUR ((size_t)4)
+#define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1)
+#define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2)
+#define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES)
+#define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U)
+
+/* The bit mask value corresponding to MALLOC_ALIGNMENT */
+#define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE)
+
+/* True if address a has acceptable alignment */
+#define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0)
+
+/* the number of bytes to offset an address to align it */
+#define align_offset(A)\
+ ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\
+ ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))
+
+/* -------------------------- MMAP preliminaries ------------------------- */
+
+/*
+ If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and
+ checks to fail so compiler optimizer can delete code rather than
+ using so many "#if"s.
+*/
+
+
+/* MORECORE and MMAP must return MFAIL on failure */
+#define MFAIL ((void*)(MAX_SIZE_T))
+#define CMFAIL ((char*)(MFAIL)) /* defined for convenience */
+
+#if HAVE_MMAP
+
+#ifndef WIN32
+#define MUNMAP_DEFAULT(a, s) munmap((a), (s))
+#define MMAP_PROT (PROT_READ|PROT_WRITE)
+#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
+#define MAP_ANONYMOUS MAP_ANON
+#endif /* MAP_ANON */
+#ifdef MAP_ANONYMOUS
+#define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS)
+#define MMAP_DEFAULT(s) mmap(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0)
+#else /* MAP_ANONYMOUS */
+/*
+ Nearly all versions of mmap support MAP_ANONYMOUS, so the following
+ is unlikely to be needed, but is supplied just in case.
+*/
+#define MMAP_FLAGS (MAP_PRIVATE)
+static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */
+#define MMAP_DEFAULT(s) ((dev_zero_fd < 0) ? \
+ (dev_zero_fd = open("/dev/zero", O_RDWR), \
+ mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \
+ mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0))
+#endif /* MAP_ANONYMOUS */
+
+#define DIRECT_MMAP_DEFAULT(s) MMAP_DEFAULT(s)
+
+#else /* WIN32 */
+
+/* Win32 MMAP via VirtualAlloc */
+static FORCEINLINE void* win32mmap(size_t size) {
+ void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
+ return (ptr != 0)? ptr: MFAIL;
+}
+
+/* For direct MMAP, use MEM_TOP_DOWN to minimize interference */
+static FORCEINLINE void* win32direct_mmap(size_t size) {
+ void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
+ PAGE_READWRITE);
+ return (ptr != 0)? ptr: MFAIL;
+}
+
+/* This function supports releasing coalesed segments */
+static FORCEINLINE int win32munmap(void* ptr, size_t size) {
+ MEMORY_BASIC_INFORMATION minfo;
+ char* cptr = (char*)ptr;
+ while (size) {
+ if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0)
+ return -1;
+ if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr ||
+ minfo.State != MEM_COMMIT || minfo.RegionSize > size)
+ return -1;
+ if (VirtualFree(cptr, 0, MEM_RELEASE) == 0)
+ return -1;
+ cptr += minfo.RegionSize;
+ size -= minfo.RegionSize;
+ }
+ return 0;
+}
+
+#define MMAP_DEFAULT(s) win32mmap(s)
+#define MUNMAP_DEFAULT(a, s) win32munmap((a), (s))
+#define DIRECT_MMAP_DEFAULT(s) win32direct_mmap(s)
+#endif /* WIN32 */
+#endif /* HAVE_MMAP */
+
+#if HAVE_MREMAP
+#ifndef WIN32
+#define MREMAP_DEFAULT(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))
+#endif /* WIN32 */
+#endif /* HAVE_MREMAP */
+
+/**
+ * Define CALL_MORECORE
+ */
+#if HAVE_MORECORE
+ #ifdef MORECORE
+ #define CALL_MORECORE(S) MORECORE(S)
+ #else /* MORECORE */
+ #define CALL_MORECORE(S) MORECORE_DEFAULT(S)
+ #endif /* MORECORE */
+#else /* HAVE_MORECORE */
+ #define CALL_MORECORE(S) MFAIL
+#endif /* HAVE_MORECORE */
+
+/**
+ * Define CALL_MMAP/CALL_MUNMAP/CALL_DIRECT_MMAP
+ */
+#if HAVE_MMAP
+ #define USE_MMAP_BIT (SIZE_T_ONE)
+
+ #ifdef MMAP
+ #define CALL_MMAP(s) MMAP(s)
+ #else /* MMAP */
+ #define CALL_MMAP(s) MMAP_DEFAULT(s)
+ #endif /* MMAP */
+ #ifdef MUNMAP
+ #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
+ #else /* MUNMAP */
+ #define CALL_MUNMAP(a, s) MUNMAP_DEFAULT((a), (s))
+ #endif /* MUNMAP */
+ #ifdef DIRECT_MMAP
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
+ #else /* DIRECT_MMAP */
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP_DEFAULT(s)
+ #endif /* DIRECT_MMAP */
+#else /* HAVE_MMAP */
+ #define USE_MMAP_BIT (SIZE_T_ZERO)
+
+ #define MMAP(s) MFAIL
+ #define MUNMAP(a, s) (-1)
+ #define DIRECT_MMAP(s) MFAIL
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
+ #define CALL_MMAP(s) MMAP(s)
+ #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
+#endif /* HAVE_MMAP */
+
+/**
+ * Define CALL_MREMAP
+ */
+#if HAVE_MMAP && HAVE_MREMAP
+ #ifdef MREMAP
+ #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP((addr), (osz), (nsz), (mv))
+ #else /* MREMAP */
+ #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP_DEFAULT((addr), (osz), (nsz), (mv))
+ #endif /* MREMAP */
+#else /* HAVE_MMAP && HAVE_MREMAP */
+ #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL
+#endif /* HAVE_MMAP && HAVE_MREMAP */
+
+/* mstate bit set if continguous morecore disabled or failed */
+#define USE_NONCONTIGUOUS_BIT (4U)
+
+/* segment bit set in create_mspace_with_base */
+#define EXTERN_BIT (8U)
+
+
+/* --------------------------- Lock preliminaries ------------------------ */
+
+/*
+ When locks are defined, there is one global lock, plus
+ one per-mspace lock.
+
+ The global lock_ensures that mparams.magic and other unique
+ mparams values are initialized only once. It also protects
+ sequences of calls to MORECORE. In many cases sys_alloc requires
+ two calls, that should not be interleaved with calls by other
+ threads. This does not protect against direct calls to MORECORE
+ by other threads not using this lock, so there is still code to
+ cope the best we can on interference.
+
+ Per-mspace locks surround calls to malloc, free, etc.
+ By default, locks are simple non-reentrant mutexes.
+
+ Because lock-protected regions generally have bounded times, it is
+ OK to use the supplied simple spinlocks. Spinlocks are likely to
+ improve performance for lightly contended applications, but worsen
+ performance under heavy contention.
+
+ If USE_LOCKS is > 1, the definitions of lock routines here are
+ bypassed, in which case you will need to define the type MLOCK_T,
+ and at least INITIAL_LOCK, DESTROY_LOCK, ACQUIRE_LOCK, RELEASE_LOCK
+ and TRY_LOCK. You must also declare a
+ static MLOCK_T malloc_global_mutex = { initialization values };.
+
+*/
+
+#if !USE_LOCKS
+#define USE_LOCK_BIT (0U)
+#define INITIAL_LOCK(l) (0)
+#define DESTROY_LOCK(l) (0)
+#define ACQUIRE_MALLOC_GLOBAL_LOCK()
+#define RELEASE_MALLOC_GLOBAL_LOCK()
+
+#else
+#if USE_LOCKS > 1
+/* ----------------------- User-defined locks ------------------------ */
+/* Define your own lock implementation here */
+/* #define INITIAL_LOCK(lk) ... */
+/* #define DESTROY_LOCK(lk) ... */
+/* #define ACQUIRE_LOCK(lk) ... */
+/* #define RELEASE_LOCK(lk) ... */
+/* #define TRY_LOCK(lk) ... */
+/* static MLOCK_T malloc_global_mutex = ... */
+
+#elif USE_SPIN_LOCKS
+
+/* First, define CAS_LOCK and CLEAR_LOCK on ints */
+/* Note CAS_LOCK defined to return 0 on success */
+
+#if defined(__GNUC__)&& (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
+#define CAS_LOCK(sl) __sync_lock_test_and_set(sl, 1)
+#define CLEAR_LOCK(sl) __sync_lock_release(sl)
+
+#elif (defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)))
+/* Custom spin locks for older gcc on x86 */
+static FORCEINLINE int x86_cas_lock(int *sl) {
+ int ret;
+ int val = 1;
+ int cmp = 0;
+ __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
+ : "=a" (ret)
+ : "r" (val), "m" (*(sl)), "0"(cmp)
+ : "memory", "cc");
+ return ret;
+}
+
+static FORCEINLINE void x86_clear_lock(int* sl) {
+ assert(*sl != 0);
+ int prev = 0;
+ int ret;
+ __asm__ __volatile__ ("lock; xchgl %0, %1"
+ : "=r" (ret)
+ : "m" (*(sl)), "0"(prev)
+ : "memory");
+}
+
+#define CAS_LOCK(sl) x86_cas_lock(sl)
+#define CLEAR_LOCK(sl) x86_clear_lock(sl)
+
+#else /* Win32 MSC */
+#define CAS_LOCK(sl) interlockedexchange(sl, 1)
+#define CLEAR_LOCK(sl) interlockedexchange (sl, 0)
+
+#endif /* ... gcc spins locks ... */
+
+/* How to yield for a spin lock */
+#define SPINS_PER_YIELD 63
+#if defined(_MSC_VER)
+#define SLEEP_EX_DURATION 50 /* delay for yield/sleep */
+#define SPIN_LOCK_YIELD SleepEx(SLEEP_EX_DURATION, FALSE)
+#elif defined (__SVR4) && defined (__sun) /* solaris */
+#define SPIN_LOCK_YIELD thr_yield();
+#elif !defined(LACKS_SCHED_H)
+#define SPIN_LOCK_YIELD sched_yield();
+#else
+#define SPIN_LOCK_YIELD
+#endif /* ... yield ... */
+
+#if !defined(USE_RECURSIVE_LOCKS) || USE_RECURSIVE_LOCKS == 0
+/* Plain spin locks use single word (embedded in malloc_states) */
+static int spin_acquire_lock(int *sl) {
+ int spins = 0;
+ while (*(volatile int *)sl != 0 || CAS_LOCK(sl)) {
+ if ((++spins & SPINS_PER_YIELD) == 0) {
+ SPIN_LOCK_YIELD;
+ }
+ }
+ return 0;
+}
+
+#define MLOCK_T int
+#define TRY_LOCK(sl) !CAS_LOCK(sl)
+#define RELEASE_LOCK(sl) CLEAR_LOCK(sl)
+#define ACQUIRE_LOCK(sl) (CAS_LOCK(sl)? spin_acquire_lock(sl) : 0)
+#define INITIAL_LOCK(sl) (*sl = 0)
+#define DESTROY_LOCK(sl) (0)
+static MLOCK_T malloc_global_mutex = 0;
+
+#else /* USE_RECURSIVE_LOCKS */
+/* types for lock owners */
+#ifdef WIN32
+#define THREAD_ID_T DWORD
+#define CURRENT_THREAD GetCurrentThreadId()
+#define EQ_OWNER(X,Y) ((X) == (Y))
+#else
+/*
+ Note: the following assume that pthread_t is a type that can be
+ initialized to (casted) zero. If this is not the case, you will need to
+ somehow redefine these or not use spin locks.
+*/
+#define THREAD_ID_T pthread_t
+#define CURRENT_THREAD pthread_self()
+#define EQ_OWNER(X,Y) pthread_equal(X, Y)
+#endif
+
+struct malloc_recursive_lock {
+ int sl;
+ unsigned int c;
+ THREAD_ID_T threadid;
+};
+
+#define MLOCK_T struct malloc_recursive_lock
+static MLOCK_T malloc_global_mutex = { 0, 0, (THREAD_ID_T)0};
+
+static FORCEINLINE void recursive_release_lock(MLOCK_T *lk) {
+ assert(lk->sl != 0);
+ if (--lk->c == 0) {
+ CLEAR_LOCK(&lk->sl);
+ }
+}
+
+static FORCEINLINE int recursive_acquire_lock(MLOCK_T *lk) {
+ THREAD_ID_T mythreadid = CURRENT_THREAD;
+ int spins = 0;
+ for (;;) {
+ if (*((volatile int *)(&lk->sl)) == 0) {
+ if (!CAS_LOCK(&lk->sl)) {
+ lk->threadid = mythreadid;
+ lk->c = 1;
+ return 0;
+ }
+ }
+ else if (EQ_OWNER(lk->threadid, mythreadid)) {
+ ++lk->c;
+ return 0;
+ }
+ if ((++spins & SPINS_PER_YIELD) == 0) {
+ SPIN_LOCK_YIELD;
+ }
+ }
+}
+
+static FORCEINLINE int recursive_try_lock(MLOCK_T *lk) {
+ THREAD_ID_T mythreadid = CURRENT_THREAD;
+ if (*((volatile int *)(&lk->sl)) == 0) {
+ if (!CAS_LOCK(&lk->sl)) {
+ lk->threadid = mythreadid;
+ lk->c = 1;
+ return 1;
+ }
+ }
+ else if (EQ_OWNER(lk->threadid, mythreadid)) {
+ ++lk->c;
+ return 1;
+ }
+ return 0;
+}
+
+#define RELEASE_LOCK(lk) recursive_release_lock(lk)
+#define TRY_LOCK(lk) recursive_try_lock(lk)
+#define ACQUIRE_LOCK(lk) recursive_acquire_lock(lk)
+#define INITIAL_LOCK(lk) ((lk)->threadid = (THREAD_ID_T)0, (lk)->sl = 0, (lk)->c = 0)
+#define DESTROY_LOCK(lk) (0)
+#endif /* USE_RECURSIVE_LOCKS */
+
+#elif defined(WIN32) /* Win32 critical sections */
+#define MLOCK_T CRITICAL_SECTION
+#define ACQUIRE_LOCK(lk) (EnterCriticalSection(lk), 0)
+#define RELEASE_LOCK(lk) LeaveCriticalSection(lk)
+#define TRY_LOCK(lk) TryEnterCriticalSection(lk)
+#define INITIAL_LOCK(lk) (!InitializeCriticalSectionAndSpinCount((lk), 0x80000000|4000))
+#define DESTROY_LOCK(lk) (DeleteCriticalSection(lk), 0)
+#define NEED_GLOBAL_LOCK_INIT
+
+static MLOCK_T malloc_global_mutex;
+static volatile long malloc_global_mutex_status;
+
+/* Use spin loop to initialize global lock */
+static void init_malloc_global_mutex() {
+ for (;;) {
+ long stat = malloc_global_mutex_status;
+ if (stat > 0)
+ return;
+ /* transition to < 0 while initializing, then to > 0) */
+ if (stat == 0 &&
+ interlockedcompareexchange(&malloc_global_mutex_status, -1, 0) == 0) {
+ InitializeCriticalSection(&malloc_global_mutex);
+ interlockedexchange(&malloc_global_mutex_status,1);
+ return;
+ }
+ SleepEx(0, FALSE);
+ }
+}
+
+#else /* pthreads-based locks */
+#define MLOCK_T pthread_mutex_t
+#define ACQUIRE_LOCK(lk) pthread_mutex_lock(lk)
+#define RELEASE_LOCK(lk) pthread_mutex_unlock(lk)
+#define TRY_LOCK(lk) (!pthread_mutex_trylock(lk))
+#define INITIAL_LOCK(lk) pthread_init_lock(lk)
+#define DESTROY_LOCK(lk) pthread_mutex_destroy(lk)
+
+#if defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0 && defined(linux) && !defined(PTHREAD_MUTEX_RECURSIVE)
+/* Cope with old-style linux recursive lock initialization by adding */
+/* skipped internal declaration from pthread.h */
+extern int pthread_mutexattr_setkind_np __P ((pthread_mutexattr_t *__attr,
+ int __kind));
+#define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
+#define pthread_mutexattr_settype(x,y) pthread_mutexattr_setkind_np(x,y)
+#endif /* USE_RECURSIVE_LOCKS ... */
+
+static MLOCK_T malloc_global_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static int pthread_init_lock (MLOCK_T *lk) {
+ pthread_mutexattr_t attr;
+ if (pthread_mutexattr_init(&attr)) return 1;
+#if defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0
+ if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)) return 1;
+#endif
+ if (pthread_mutex_init(lk, &attr)) return 1;
+ if (pthread_mutexattr_destroy(&attr)) return 1;
+ return 0;
+}
+
+#endif /* ... lock types ... */
+
+/* Common code for all lock types */
+#define USE_LOCK_BIT (2U)
+
+#ifndef ACQUIRE_MALLOC_GLOBAL_LOCK
+#define ACQUIRE_MALLOC_GLOBAL_LOCK() ACQUIRE_LOCK(&malloc_global_mutex);
+#endif
+
+#ifndef RELEASE_MALLOC_GLOBAL_LOCK
+#define RELEASE_MALLOC_GLOBAL_LOCK() RELEASE_LOCK(&malloc_global_mutex);
+#endif
+
+#endif /* USE_LOCKS */
+
+/* ----------------------- Chunk representations ------------------------ */
+
+/*
+ (The following includes lightly edited explanations by Colin Plumb.)
+
+ The malloc_chunk declaration below is misleading (but accurate and
+ necessary). It declares a "view" into memory allowing access to
+ necessary fields at known offsets from a given base.
+
+ Chunks of memory are maintained using a `boundary tag' method as
+ originally described by Knuth. (See the paper by Paul Wilson
+ ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such
+ techniques.) Sizes of free chunks are stored both in the front of
+ each chunk and at the end. This makes consolidating fragmented
+ chunks into bigger chunks fast. The head fields also hold bits
+ representing whether chunks are free or in use.
+
+ Here are some pictures to make it clearer. They are "exploded" to
+ show that the state of a chunk can be thought of as extending from
+ the high 31 bits of the head field of its header through the
+ prev_foot and PINUSE_BIT bit of the following chunk header.
+
+ A chunk that's in use looks like:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk (if P = 0) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
+ | Size of this chunk 1| +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | |
+ +- -+
+ | |
+ +- -+
+ | :
+ +- size - sizeof(size_t) available payload bytes -+
+ : |
+ chunk-> +- -+
+ | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|
+ | Size of next chunk (may or may not be in use) | +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ And if it's free, it looks like this:
+
+ chunk-> +- -+
+ | User payload (must be in use, or we would have merged!) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
+ | Size of this chunk 0| +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Next pointer |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Prev pointer |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | :
+ +- size - sizeof(struct chunk) unused bytes -+
+ : |
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of this chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|
+ | Size of next chunk (must be in use, or we would have merged)| +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | :
+ +- User payload -+
+ : |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |0|
+ +-+
+ Note that since we always merge adjacent free chunks, the chunks
+ adjacent to a free chunk must be in use.
+
+ Given a pointer to a chunk (which can be derived trivially from the
+ payload pointer) we can, in O(1) time, find out whether the adjacent
+ chunks are free, and if so, unlink them from the lists that they
+ are on and merge them with the current chunk.
+
+ Chunks always begin on even word boundaries, so the mem portion
+ (which is returned to the user) is also on an even word boundary, and
+ thus at least double-word aligned.
+
+ The P (PINUSE_BIT) bit, stored in the unused low-order bit of the
+ chunk size (which is always a multiple of two words), is an in-use
+ bit for the *previous* chunk. If that bit is *clear*, then the
+ word before the current chunk size contains the previous chunk
+ size, and can be used to find the front of the previous chunk.
+ The very first chunk allocated always has this bit set, preventing
+ access to non-existent (or non-owned) memory. If pinuse is set for
+ any given chunk, then you CANNOT determine the size of the
+ previous chunk, and might even get a memory addressing fault when
+ trying to do so.
+
+ The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of
+ the chunk size redundantly records whether the current chunk is
+ inuse (unless the chunk is mmapped). This redundancy enables usage
+ checks within free and realloc, and reduces indirection when freeing
+ and consolidating chunks.
+
+ Each freshly allocated chunk must have both cinuse and pinuse set.
+ That is, each allocated chunk borders either a previously allocated
+ and still in-use chunk, or the base of its memory arena. This is
+ ensured by making all allocations from the `lowest' part of any
+ found chunk. Further, no free chunk physically borders another one,
+ so each free chunk is known to be preceded and followed by either
+ inuse chunks or the ends of memory.
+
+ Note that the `foot' of the current chunk is actually represented
+ as the prev_foot of the NEXT chunk. This makes it easier to
+ deal with alignments etc but can be very confusing when trying
+ to extend or adapt this code.
+
+ The exceptions to all this are
+
+ 1. The special chunk `top' is the top-most available chunk (i.e.,
+ the one bordering the end of available memory). It is treated
+ specially. Top is never included in any bin, is used only if
+ no other chunk is available, and is released back to the
+ system if it is very large (see M_TRIM_THRESHOLD). In effect,
+ the top chunk is treated as larger (and thus less well
+ fitting) than any other available chunk. The top chunk
+ doesn't update its trailing size field since there is no next
+ contiguous chunk that would have to index off it. However,
+ space is still allocated for it (TOP_FOOT_SIZE) to enable
+ separation or merging when space is extended.
+
+ 3. Chunks allocated via mmap, have both cinuse and pinuse bits
+ cleared in their head fields. Because they are allocated
+ one-by-one, each must carry its own prev_foot field, which is
+ also used to hold the offset this chunk has within its mmapped
+ region, which is needed to preserve alignment. Each mmapped
+ chunk is trailed by the first two fields of a fake next-chunk
+ for sake of usage checks.
+
+*/
+
+struct malloc_chunk {
+ size_t prev_foot; /* Size of previous chunk (if free). */
+ size_t head; /* Size and inuse bits. */
+ struct malloc_chunk* fd; /* double links -- used only if free. */
+ struct malloc_chunk* bk;
+};
+
+typedef struct malloc_chunk mchunk;
+typedef struct malloc_chunk* mchunkptr;
+typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */
+typedef unsigned int bindex_t; /* Described below */
+typedef unsigned int binmap_t; /* Described below */
+typedef unsigned int flag_t; /* The type of various bit flag sets */
+
+/* ------------------- Chunks sizes and alignments ----------------------- */
+
+#define MCHUNK_SIZE (sizeof(mchunk))
+
+#if FOOTERS
+#define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
+#else /* FOOTERS */
+#define CHUNK_OVERHEAD (SIZE_T_SIZE)
+#endif /* FOOTERS */
+
+/* MMapped chunks need a second word of overhead ... */
+#define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
+/* ... and additional padding for fake next-chunk at foot */
+#define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES)
+
+/* The smallest size we can malloc is an aligned minimal chunk */
+#define MIN_CHUNK_SIZE\
+ ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
+
+/* conversion from malloc headers to user pointers, and back */
+#define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES))
+#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES))
+/* chunk associated with aligned address A */
+#define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A)))
+
+/* Bounds on request (not chunk) sizes. */
+#define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2)
+#define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE)
+
+/* pad request bytes into a usable size */
+#define pad_request(req) \
+ (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
+
+/* pad request, checking for minimum (but not maximum) */
+#define request2size(req) \
+ (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req))
+
+
+/* ------------------ Operations on head and foot fields ----------------- */
+
+/*
+ The head field of a chunk is or'ed with PINUSE_BIT when previous
+ adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in
+ use, unless mmapped, in which case both bits are cleared.
+
+ FLAG4_BIT is not used by this malloc, but might be useful in extensions.
+*/
+
+#define PINUSE_BIT (SIZE_T_ONE)
+#define CINUSE_BIT (SIZE_T_TWO)
+#define FLAG4_BIT (SIZE_T_FOUR)
+#define INUSE_BITS (PINUSE_BIT|CINUSE_BIT)
+#define FLAG_BITS (PINUSE_BIT|CINUSE_BIT|FLAG4_BIT)
+
+/* Head value for fenceposts */
+#define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE)
+
+/* extraction of fields from head words */
+#define cinuse(p) ((p)->head & CINUSE_BIT)
+#define pinuse(p) ((p)->head & PINUSE_BIT)
+#define flag4inuse(p) ((p)->head & FLAG4_BIT)
+#define is_inuse(p) (((p)->head & INUSE_BITS) != PINUSE_BIT)
+#define is_mmapped(p) (((p)->head & INUSE_BITS) == 0)
+
+#define chunksize(p) ((p)->head & ~(FLAG_BITS))
+
+#define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT)
+#define set_flag4(p) ((p)->head |= FLAG4_BIT)
+#define clear_flag4(p) ((p)->head &= ~FLAG4_BIT)
+
+/* Treat space at ptr +/- offset as a chunk */
+#define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))
+#define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s)))
+
+/* Ptr to next or previous physical malloc_chunk. */
+#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~FLAG_BITS)))
+#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))
+
+/* extract next chunk's pinuse bit */
+#define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT)
+
+/* Get/set size at footer */
+#define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot)
+#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))
+
+/* Set size, pinuse bit, and foot */
+#define set_size_and_pinuse_of_free_chunk(p, s)\
+ ((p)->head = (s|PINUSE_BIT), set_foot(p, s))
+
+/* Set size, pinuse bit, foot, and clear next pinuse */
+#define set_free_with_pinuse(p, s, n)\
+ (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s))
+
+/* Get the internal overhead associated with chunk p */
+#define overhead_for(p)\
+ (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD)
+
+/* Return true if malloced space is not necessarily cleared */
+#if MMAP_CLEARS
+#define calloc_must_clear(p) (!is_mmapped(p))
+#else /* MMAP_CLEARS */
+#define calloc_must_clear(p) (1)
+#endif /* MMAP_CLEARS */
+
+/* ---------------------- Overlaid data structures ----------------------- */
+
+/*
+ When chunks are not in use, they are treated as nodes of either
+ lists or trees.
+
+ "Small" chunks are stored in circular doubly-linked lists, and look
+ like this:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `head:' | Size of chunk, in bytes |P|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Forward pointer to next chunk in list |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Back pointer to previous chunk in list |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Unused space (may be 0 bytes long) .
+ . .
+ . |
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `foot:' | Size of chunk, in bytes |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Larger chunks are kept in a form of bitwise digital trees (aka
+ tries) keyed on chunksizes. Because malloc_tree_chunks are only for
+ free chunks greater than 256 bytes, their size doesn't impose any
+ constraints on user chunk sizes. Each node looks like:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `head:' | Size of chunk, in bytes |P|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Forward pointer to next chunk of same size |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Back pointer to previous chunk of same size |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Pointer to left child (child[0]) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Pointer to right child (child[1]) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Pointer to parent |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | bin index of this chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Unused space .
+ . |
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `foot:' | Size of chunk, in bytes |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Each tree holding treenodes is a tree of unique chunk sizes. Chunks
+ of the same size are arranged in a circularly-linked list, with only
+ the oldest chunk (the next to be used, in our FIFO ordering)
+ actually in the tree. (Tree members are distinguished by a non-null
+ parent pointer.) If a chunk with the same size an an existing node
+ is inserted, it is linked off the existing node using pointers that
+ work in the same way as fd/bk pointers of small chunks.
+
+ Each tree contains a power of 2 sized range of chunk sizes (the
+ smallest is 0x100 <= x < 0x180), which is is divided in half at each
+ tree level, with the chunks in the smaller half of the range (0x100
+ <= x < 0x140 for the top nose) in the left subtree and the larger
+ half (0x140 <= x < 0x180) in the right subtree. This is, of course,
+ done by inspecting individual bits.
+
+ Using these rules, each node's left subtree contains all smaller
+ sizes than its right subtree. However, the node at the root of each
+ subtree has no particular ordering relationship to either. (The
+ dividing line between the subtree sizes is based on trie relation.)
+ If we remove the last chunk of a given size from the interior of the
+ tree, we need to replace it with a leaf node. The tree ordering
+ rules permit a node to be replaced by any leaf below it.
+
+ The smallest chunk in a tree (a common operation in a best-fit
+ allocator) can be found by walking a path to the leftmost leaf in
+ the tree. Unlike a usual binary tree, where we follow left child
+ pointers until we reach a null, here we follow the right child
+ pointer any time the left one is null, until we reach a leaf with
+ both child pointers null. The smallest chunk in the tree will be
+ somewhere along that path.
+
+ The worst case number of steps to add, find, or remove a node is
+ bounded by the number of bits differentiating chunks within
+ bins. Under current bin calculations, this ranges from 6 up to 21
+ (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case
+ is of course much better.
+*/
+
+struct malloc_tree_chunk {
+ /* The first four fields must be compatible with malloc_chunk */
+ size_t prev_foot;
+ size_t head;
+ struct malloc_tree_chunk* fd;
+ struct malloc_tree_chunk* bk;
+
+ struct malloc_tree_chunk* child[2];
+ struct malloc_tree_chunk* parent;
+ bindex_t index;
+};
+
+typedef struct malloc_tree_chunk tchunk;
+typedef struct malloc_tree_chunk* tchunkptr;
+typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */
+
+/* A little helper macro for trees */
+#define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1])
+
+/* ----------------------------- Segments -------------------------------- */
+
+/*
+ Each malloc space may include non-contiguous segments, held in a
+ list headed by an embedded malloc_segment record representing the
+ top-most space. Segments also include flags holding properties of
+ the space. Large chunks that are directly allocated by mmap are not
+ included in this list. They are instead independently created and
+ destroyed without otherwise keeping track of them.
+
+ Segment management mainly comes into play for spaces allocated by
+ MMAP. Any call to MMAP might or might not return memory that is
+ adjacent to an existing segment. MORECORE normally contiguously
+ extends the current space, so this space is almost always adjacent,
+ which is simpler and faster to deal with. (This is why MORECORE is
+ used preferentially to MMAP when both are available -- see
+ sys_alloc.) When allocating using MMAP, we don't use any of the
+ hinting mechanisms (inconsistently) supported in various
+ implementations of unix mmap, or distinguish reserving from
+ committing memory. Instead, we just ask for space, and exploit
+ contiguity when we get it. It is probably possible to do
+ better than this on some systems, but no general scheme seems
+ to be significantly better.
+
+ Management entails a simpler variant of the consolidation scheme
+ used for chunks to reduce fragmentation -- new adjacent memory is
+ normally prepended or appended to an existing segment. However,
+ there are limitations compared to chunk consolidation that mostly
+ reflect the fact that segment processing is relatively infrequent
+ (occurring only when getting memory from system) and that we
+ don't expect to have huge numbers of segments:
+
+ * Segments are not indexed, so traversal requires linear scans. (It
+ would be possible to index these, but is not worth the extra
+ overhead and complexity for most programs on most platforms.)
+ * New segments are only appended to old ones when holding top-most
+ memory; if they cannot be prepended to others, they are held in
+ different segments.
+
+ Except for the top-most segment of an mstate, each segment record
+ is kept at the tail of its segment. Segments are added by pushing
+ segment records onto the list headed by &mstate.seg for the
+ containing mstate.
+
+ Segment flags control allocation/merge/deallocation policies:
+ * If EXTERN_BIT set, then we did not allocate this segment,
+ and so should not try to deallocate or merge with others.
+ (This currently holds only for the initial segment passed
+ into create_mspace_with_base.)
+ * If USE_MMAP_BIT set, the segment may be merged with
+ other surrounding mmapped segments and trimmed/de-allocated
+ using munmap.
+ * If neither bit is set, then the segment was obtained using
+ MORECORE so can be merged with surrounding MORECORE'd segments
+ and deallocated/trimmed using MORECORE with negative arguments.
+*/
+
+struct malloc_segment {
+ char* base; /* base address */
+ size_t size; /* allocated size */
+ struct malloc_segment* next; /* ptr to next segment */
+ flag_t sflags; /* mmap and extern flag */
+};
+
+#define is_mmapped_segment(S) ((S)->sflags & USE_MMAP_BIT)
+#define is_extern_segment(S) ((S)->sflags & EXTERN_BIT)
+
+typedef struct malloc_segment msegment;
+typedef struct malloc_segment* msegmentptr;
+
+/* ---------------------------- malloc_state ----------------------------- */
+
+/*
+ A malloc_state holds all of the bookkeeping for a space.
+ The main fields are:
+
+ Top
+ The topmost chunk of the currently active segment. Its size is
+ cached in topsize. The actual size of topmost space is
+ topsize+TOP_FOOT_SIZE, which includes space reserved for adding
+ fenceposts and segment records if necessary when getting more
+ space from the system. The size at which to autotrim top is
+ cached from mparams in trim_check, except that it is disabled if
+ an autotrim fails.
+
+ Designated victim (dv)
+ This is the preferred chunk for servicing small requests that
+ don't have exact fits. It is normally the chunk split off most
+ recently to service another small request. Its size is cached in
+ dvsize. The link fields of this chunk are not maintained since it
+ is not kept in a bin.
+
+ SmallBins
+ An array of bin headers for free chunks. These bins hold chunks
+ with sizes less than MIN_LARGE_SIZE bytes. Each bin contains
+ chunks of all the same size, spaced 8 bytes apart. To simplify
+ use in double-linked lists, each bin header acts as a malloc_chunk
+ pointing to the real first node, if it exists (else pointing to
+ itself). This avoids special-casing for headers. But to avoid
+ waste, we allocate only the fd/bk pointers of bins, and then use
+ repositioning tricks to treat these as the fields of a chunk.
+
+ TreeBins
+ Treebins are pointers to the roots of trees holding a range of
+ sizes. There are 2 equally spaced treebins for each power of two
+ from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything
+ larger.
+
+ Bin maps
+ There is one bit map for small bins ("smallmap") and one for
+ treebins ("treemap). Each bin sets its bit when non-empty, and
+ clears the bit when empty. Bit operations are then used to avoid
+ bin-by-bin searching -- nearly all "search" is done without ever
+ looking at bins that won't be selected. The bit maps
+ conservatively use 32 bits per map word, even if on 64bit system.
+ For a good description of some of the bit-based techniques used
+ here, see Henry S. Warren Jr's book "Hacker's Delight" (and
+ supplement at http://hackersdelight.org/). Many of these are
+ intended to reduce the branchiness of paths through malloc etc, as
+ well as to reduce the number of memory locations read or written.
+
+ Segments
+ A list of segments headed by an embedded malloc_segment record
+ representing the initial space.
+
+ Address check support
+ The least_addr field is the least address ever obtained from
+ MORECORE or MMAP. Attempted frees and reallocs of any address less
+ than this are trapped (unless INSECURE is defined).
+
+ Magic tag
+ A cross-check field that should always hold same value as mparams.magic.
+
+ Max allowed footprint
+ The maximum allowed bytes to allocate from system (zero means no limit)
+
+ Flags
+ Bits recording whether to use MMAP, locks, or contiguous MORECORE
+
+ Statistics
+ Each space keeps track of current and maximum system memory
+ obtained via MORECORE or MMAP.
+
+ Trim support
+ Fields holding the amount of unused topmost memory that should trigger
+ trimming, and a counter to force periodic scanning to release unused
+ non-topmost segments.
+
+ Locking
+ If USE_LOCKS is defined, the "mutex" lock is acquired and released
+ around every public call using this mspace.
+
+ Extension support
+ A void* pointer and a size_t field that can be used to help implement
+ extensions to this malloc.
+*/
+
+/* Bin types, widths and sizes */
+#define NSMALLBINS (32U)
+#define NTREEBINS (32U)
+#define SMALLBIN_SHIFT (3U)
+#define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT)
+#define TREEBIN_SHIFT (8U)
+#define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT)
+#define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE)
+#define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD)
+
+struct malloc_state {
+ binmap_t smallmap;
+ binmap_t treemap;
+ size_t dvsize;
+ size_t topsize;
+ char* least_addr;
+ mchunkptr dv;
+ mchunkptr top;
+ size_t trim_check;
+ size_t release_checks;
+ size_t magic;
+ mchunkptr smallbins[(NSMALLBINS+1)*2];
+ tbinptr treebins[NTREEBINS];
+ size_t footprint;
+ size_t max_footprint;
+ size_t footprint_limit; /* zero means no limit */
+ flag_t mflags;
+#if USE_LOCKS
+ MLOCK_T mutex; /* locate lock among fields that rarely change */
+#endif /* USE_LOCKS */
+ msegment seg;
+ void* extp; /* Unused but available for extensions */
+ size_t exts;
+};
+
+typedef struct malloc_state* mstate;
+
+/* ------------- Global malloc_state and malloc_params ------------------- */
+
+/*
+ malloc_params holds global properties, including those that can be
+ dynamically set using mallopt. There is a single instance, mparams,
+ initialized in init_mparams. Note that the non-zeroness of "magic"
+ also serves as an initialization flag.
+*/
+
+struct malloc_params {
+ size_t magic;
+ size_t page_size;
+ size_t granularity;
+ size_t mmap_threshold;
+ size_t trim_threshold;
+ flag_t default_mflags;
+};
+
+static struct malloc_params mparams;
+
+/* Ensure mparams initialized */
+#define ensure_initialization() (void)(mparams.magic != 0 || init_mparams())
+
+#if !ONLY_MSPACES
+
+/* The global malloc_state used for all non-"mspace" calls */
+static struct malloc_state _gm_;
+#define gm (&_gm_)
+#define is_global(M) ((M) == &_gm_)
+
+#endif /* !ONLY_MSPACES */
+
+#define is_initialized(M) ((M)->top != 0)
+
+/* -------------------------- system alloc setup ------------------------- */
+
+/* Operations on mflags */
+
+#define use_lock(M) ((M)->mflags & USE_LOCK_BIT)
+#define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT)
+#if USE_LOCKS
+#define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT)
+#else
+#define disable_lock(M)
+#endif
+
+#define use_mmap(M) ((M)->mflags & USE_MMAP_BIT)
+#define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT)
+#if HAVE_MMAP
+#define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT)
+#else
+#define disable_mmap(M)
+#endif
+
+#define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT)
+#define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT)
+
+#define set_lock(M,L)\
+ ((M)->mflags = (L)?\
+ ((M)->mflags | USE_LOCK_BIT) :\
+ ((M)->mflags & ~USE_LOCK_BIT))
+
+/* page-align a size */
+#define page_align(S)\
+ (((S) + (mparams.page_size - SIZE_T_ONE)) & ~(mparams.page_size - SIZE_T_ONE))
+
+/* granularity-align a size */
+#define granularity_align(S)\
+ (((S) + (mparams.granularity - SIZE_T_ONE))\
+ & ~(mparams.granularity - SIZE_T_ONE))
+
+
+/* For mmap, use granularity alignment on windows, else page-align */
+#ifdef WIN32
+#define mmap_align(S) granularity_align(S)
+#else
+#define mmap_align(S) page_align(S)
+#endif
+
+/* For sys_alloc, enough padding to ensure can malloc request on success */
+#define SYS_ALLOC_PADDING (TOP_FOOT_SIZE + MALLOC_ALIGNMENT)
+
+#define is_page_aligned(S)\
+ (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0)
+#define is_granularity_aligned(S)\
+ (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0)
+
+/* True if segment S holds address A */
+#define segment_holds(S, A)\
+ ((char*)(A) >= S->base && (char*)(A) < S->base + S->size)
+
+/* Return segment holding given address */
+static msegmentptr segment_holding(mstate m, char* addr) {
+ msegmentptr sp = &m->seg;
+ for (;;) {
+ if (addr >= sp->base && addr < sp->base + sp->size)
+ return sp;
+ if ((sp = sp->next) == 0)
+ return 0;
+ }
+}
+
+/* Return true if segment contains a segment link */
+static int has_segment_link(mstate m, msegmentptr ss) {
+ msegmentptr sp = &m->seg;
+ for (;;) {
+ if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size)
+ return 1;
+ if ((sp = sp->next) == 0)
+ return 0;
+ }
+}
+
+#ifndef MORECORE_CANNOT_TRIM
+#define should_trim(M,s) ((s) > (M)->trim_check)
+#else /* MORECORE_CANNOT_TRIM */
+#define should_trim(M,s) (0)
+#endif /* MORECORE_CANNOT_TRIM */
+
+/*
+ TOP_FOOT_SIZE is padding at the end of a segment, including space
+ that may be needed to place segment records and fenceposts when new
+ noncontiguous segments are added.
+*/
+#define TOP_FOOT_SIZE\
+ (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
+
+
+/* ------------------------------- Hooks -------------------------------- */
+
+/*
+ PREACTION should be defined to return 0 on success, and nonzero on
+ failure. If you are not using locking, you can redefine these to do
+ anything you like.
+*/
+
+#if USE_LOCKS
+#define PREACTION(M) ((use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0)
+#define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); }
+#else /* USE_LOCKS */
+
+#ifndef PREACTION
+#define PREACTION(M) (0)
+#endif /* PREACTION */
+
+#ifndef POSTACTION
+#define POSTACTION(M)
+#endif /* POSTACTION */
+
+#endif /* USE_LOCKS */
+
+/*
+ CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses.
+ USAGE_ERROR_ACTION is triggered on detected bad frees and
+ reallocs. The argument p is an address that might have triggered the
+ fault. It is ignored by the two predefined actions, but might be
+ useful in custom actions that try to help diagnose errors.
+*/
+
+#if PROCEED_ON_ERROR
+
+/* A count of the number of corruption errors causing resets */
+int malloc_corruption_error_count;
+
+/* default corruption action */
+static void reset_on_error(mstate m);
+
+#define CORRUPTION_ERROR_ACTION(m) reset_on_error(m)
+#define USAGE_ERROR_ACTION(m, p)
+
+#else /* PROCEED_ON_ERROR */
+
+#ifndef CORRUPTION_ERROR_ACTION
+#define CORRUPTION_ERROR_ACTION(m) ABORT
+#endif /* CORRUPTION_ERROR_ACTION */
+
+#ifndef USAGE_ERROR_ACTION
+#define USAGE_ERROR_ACTION(m,p) ABORT
+#endif /* USAGE_ERROR_ACTION */
+
+#endif /* PROCEED_ON_ERROR */
+
+
+/* -------------------------- Debugging setup ---------------------------- */
+
+#if ! DEBUG
+
+#define check_free_chunk(M,P)
+#define check_inuse_chunk(M,P)
+#define check_malloced_chunk(M,P,N)
+#define check_mmapped_chunk(M,P)
+#define check_malloc_state(M)
+#define check_top_chunk(M,P)
+
+#else /* DEBUG */
+#define check_free_chunk(M,P) do_check_free_chunk(M,P)
+#define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P)
+#define check_top_chunk(M,P) do_check_top_chunk(M,P)
+#define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N)
+#define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P)
+#define check_malloc_state(M) do_check_malloc_state(M)
+
+static void do_check_any_chunk(mstate m, mchunkptr p);
+static void do_check_top_chunk(mstate m, mchunkptr p);
+static void do_check_mmapped_chunk(mstate m, mchunkptr p);
+static void do_check_inuse_chunk(mstate m, mchunkptr p);
+static void do_check_free_chunk(mstate m, mchunkptr p);
+static void do_check_malloced_chunk(mstate m, void* mem, size_t s);
+static void do_check_tree(mstate m, tchunkptr t);
+static void do_check_treebin(mstate m, bindex_t i);
+static void do_check_smallbin(mstate m, bindex_t i);
+static void do_check_malloc_state(mstate m);
+static int bin_find(mstate m, mchunkptr x);
+static size_t traverse_and_check(mstate m);
+#endif /* DEBUG */
+
+/* ---------------------------- Indexing Bins ---------------------------- */
+
+#define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS)
+#define small_index(s) (bindex_t)((s) >> SMALLBIN_SHIFT)
+#define small_index2size(i) ((i) << SMALLBIN_SHIFT)
+#define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE))
+
+/* addressing by index. See above about smallbin repositioning */
+#define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1])))
+#define treebin_at(M,i) (&((M)->treebins[i]))
+
+/* assign tree index for size S to variable I. Use x86 asm if possible */
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+#define compute_tree_index(S, I)\
+{\
+ unsigned int X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int K = (unsigned) sizeof(X)*__CHAR_BIT__ - 1 - (unsigned) __builtin_clz(X); \
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
+ }\
+}
+
+#elif defined (__INTEL_COMPILER)
+#define compute_tree_index(S, I)\
+{\
+ size_t X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int K = _bit_scan_reverse (X); \
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
+ }\
+}
+
+#elif defined(_MSC_VER) && _MSC_VER>=1300
+#define compute_tree_index(S, I)\
+{\
+ size_t X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int K;\
+ _BitScanReverse((DWORD *) &K, (DWORD) X);\
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
+ }\
+}
+
+#else /* GNUC */
+#define compute_tree_index(S, I)\
+{\
+ size_t X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int Y = (unsigned int)X;\
+ unsigned int N = ((Y - 0x100) >> 16) & 8;\
+ unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\
+ N += K;\
+ N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\
+ K = 14 - N + ((Y <<= K) >> 15);\
+ I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\
+ }\
+}
+#endif /* GNUC */
+
+/* Bit representing maximum resolved size in a treebin at i */
+#define bit_for_tree_index(i) \
+ (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2)
+
+/* Shift placing maximum resolved bit in a treebin at i as sign bit */
+#define leftshift_for_tree_index(i) \
+ ((i == NTREEBINS-1)? 0 : \
+ ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2)))
+
+/* The size of the smallest chunk held in bin with index i */
+#define minsize_for_tree_index(i) \
+ ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \
+ (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1)))
+
+
+/* ------------------------ Operations on bin maps ----------------------- */
+
+/* bit corresponding to given index */
+#define idx2bit(i) ((binmap_t)(1) << (i))
+
+/* Mark/Clear bits with given index */
+#define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i))
+#define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i))
+#define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i))
+
+#define mark_treemap(M,i) ((M)->treemap |= idx2bit(i))
+#define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i))
+#define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i))
+
+/* isolate the least set bit of a bitmap */
+#define least_bit(x) ((x) & -(x))
+
+/* mask with all bits to left of least bit of x on */
+#define left_bits(x) ((x<<1) | -(x<<1))
+
+/* mask with all bits to left of or equal to least bit of x on */
+#define same_or_left_bits(x) ((x) | -(x))
+
+/* index corresponding to given bit. Use x86 asm if possible */
+
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int J;\
+ J = __builtin_ctz(X); \
+ I = (bindex_t)J;\
+}
+
+#elif defined (__INTEL_COMPILER)
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int J;\
+ J = _bit_scan_forward (X); \
+ I = (bindex_t)J;\
+}
+
+#elif defined(_MSC_VER) && _MSC_VER>=1300
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int J;\
+ _BitScanForward((DWORD *) &J, X);\
+ I = (bindex_t)J;\
+}
+
+#elif USE_BUILTIN_FFS
+#define compute_bit2idx(X, I) I = ffs(X)-1
+
+#else
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int Y = X - 1;\
+ unsigned int K = Y >> (16-4) & 16;\
+ unsigned int N = K; Y >>= K;\
+ N += K = Y >> (8-3) & 8; Y >>= K;\
+ N += K = Y >> (4-2) & 4; Y >>= K;\
+ N += K = Y >> (2-1) & 2; Y >>= K;\
+ N += K = Y >> (1-0) & 1; Y >>= K;\
+ I = (bindex_t)(N + Y);\
+}
+#endif /* GNUC */
+
+
+/* ----------------------- Runtime Check Support ------------------------- */
+
+/*
+ For security, the main invariant is that malloc/free/etc never
+ writes to a static address other than malloc_state, unless static
+ malloc_state itself has been corrupted, which cannot occur via
+ malloc (because of these checks). In essence this means that we
+ believe all pointers, sizes, maps etc held in malloc_state, but
+ check all of those linked or offsetted from other embedded data
+ structures. These checks are interspersed with main code in a way
+ that tends to minimize their run-time cost.
+
+ When FOOTERS is defined, in addition to range checking, we also
+ verify footer fields of inuse chunks, which can be used guarantee
+ that the mstate controlling malloc/free is intact. This is a
+ streamlined version of the approach described by William Robertson
+ et al in "Run-time Detection of Heap-based Overflows" LISA'03
+ http://www.usenix.org/events/lisa03/tech/robertson.html The footer
+ of an inuse chunk holds the xor of its mstate and a random seed,
+ that is checked upon calls to free() and realloc(). This is
+ (probabalistically) unguessable from outside the program, but can be
+ computed by any code successfully malloc'ing any chunk, so does not
+ itself provide protection against code that has already broken
+ security through some other means. Unlike Robertson et al, we
+ always dynamically check addresses of all offset chunks (previous,
+ next, etc). This turns out to be cheaper than relying on hashes.
+*/
+
+#if !INSECURE
+/* Check if address a is at least as high as any from MORECORE or MMAP */
+#define ok_address(M, a) ((char*)(a) >= (M)->least_addr)
+/* Check if address of next chunk n is higher than base chunk p */
+#define ok_next(p, n) ((char*)(p) < (char*)(n))
+/* Check if p has inuse status */
+#define ok_inuse(p) is_inuse(p)
+/* Check if p has its pinuse bit on */
+#define ok_pinuse(p) pinuse(p)
+
+#else /* !INSECURE */
+#define ok_address(M, a) (1)
+#define ok_next(b, n) (1)
+#define ok_inuse(p) (1)
+#define ok_pinuse(p) (1)
+#endif /* !INSECURE */
+
+#if (FOOTERS && !INSECURE)
+/* Check if (alleged) mstate m has expected magic field */
+#define ok_magic(M) ((M)->magic == mparams.magic)
+#else /* (FOOTERS && !INSECURE) */
+#define ok_magic(M) (1)
+#endif /* (FOOTERS && !INSECURE) */
+
+/* In gcc, use __builtin_expect to minimize impact of checks */
+#if !INSECURE
+#if defined(__GNUC__) && __GNUC__ >= 3
+#define RTCHECK(e) __builtin_expect(e, 1)
+#else /* GNUC */
+#define RTCHECK(e) (e)
+#endif /* GNUC */
+#else /* !INSECURE */
+#define RTCHECK(e) (1)
+#endif /* !INSECURE */
+
+/* macros to set up inuse chunks with or without footers */
+
+#if !FOOTERS
+
+#define mark_inuse_foot(M,p,s)
+
+/* Macros for setting head/foot of non-mmapped chunks */
+
+/* Set cinuse bit and pinuse bit of next chunk */
+#define set_inuse(M,p,s)\
+ ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
+ ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
+
+/* Set cinuse and pinuse of this chunk and pinuse of next chunk */
+#define set_inuse_and_pinuse(M,p,s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
+ ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
+
+/* Set size, cinuse and pinuse bit of this chunk */
+#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT))
+
+#else /* FOOTERS */
+
+/* Set foot of inuse chunk to be xor of mstate and seed */
+#define mark_inuse_foot(M,p,s)\
+ (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))
+
+#define get_mstate_for(p)\
+ ((mstate)(((mchunkptr)((char*)(p) +\
+ (chunksize(p))))->prev_foot ^ mparams.magic))
+
+#define set_inuse(M,p,s)\
+ ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
+ (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \
+ mark_inuse_foot(M,p,s))
+
+#define set_inuse_and_pinuse(M,p,s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
+ (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\
+ mark_inuse_foot(M,p,s))
+
+#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
+ mark_inuse_foot(M, p, s))
+
+#endif /* !FOOTERS */
+
+/* ---------------------------- setting mparams -------------------------- */
+
+/* Initialize mparams */
+static int init_mparams(void) {
+#ifdef NEED_GLOBAL_LOCK_INIT
+ if (malloc_global_mutex_status <= 0)
+ init_malloc_global_mutex();
+#endif
+
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+ if (mparams.magic == 0) {
+ size_t magic;
+ size_t psize;
+ size_t gsize;
+
+#ifndef WIN32
+ psize = malloc_getpagesize;
+ gsize = ((DEFAULT_GRANULARITY != 0)? DEFAULT_GRANULARITY : psize);
+#else /* WIN32 */
+ {
+ SYSTEM_INFO system_info;
+ GetSystemInfo(&system_info);
+ psize = system_info.dwPageSize;
+ gsize = ((DEFAULT_GRANULARITY != 0)?
+ DEFAULT_GRANULARITY : system_info.dwAllocationGranularity);
+ }
+#endif /* WIN32 */
+
+ /* Sanity-check configuration:
+ size_t must be unsigned and as wide as pointer type.
+ ints must be at least 4 bytes.
+ alignment must be at least 8.
+ Alignment, min chunk size, and page size must all be powers of 2.
+ */
+ if ((sizeof(size_t) != sizeof(char*)) ||
+ (MAX_SIZE_T < MIN_CHUNK_SIZE) ||
+ (sizeof(int) < 4) ||
+ (MALLOC_ALIGNMENT < (size_t)8U) ||
+ ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) ||
+ ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) ||
+ ((gsize & (gsize-SIZE_T_ONE)) != 0) ||
+ ((psize & (psize-SIZE_T_ONE)) != 0))
+ ABORT;
+
+ mparams.granularity = gsize;
+ mparams.page_size = psize;
+ mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD;
+ mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD;
+#if MORECORE_CONTIGUOUS
+ mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT;
+#else /* MORECORE_CONTIGUOUS */
+ mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT;
+#endif /* MORECORE_CONTIGUOUS */
+
+#if !ONLY_MSPACES
+ /* Set up lock for main malloc area */
+ gm->mflags = mparams.default_mflags;
+ (void)INITIAL_LOCK(&gm->mutex);
+#endif
+
+ {
+#if USE_DEV_RANDOM
+ int fd;
+ unsigned char buf[sizeof(size_t)];
+ /* Try to use /dev/urandom, else fall back on using time */
+ if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 &&
+ read(fd, buf, sizeof(buf)) == sizeof(buf)) {
+ magic = *((size_t *) buf);
+ close(fd);
+ }
+ else
+#endif /* USE_DEV_RANDOM */
+#ifdef WIN32
+ magic = (size_t)(GetTickCount() ^ (size_t)0x55555555U);
+#elif defined(LACKS_TIME_H)
+ magic = (size_t)&magic ^ (size_t)0x55555555U;
+#else
+ magic = (size_t)(time(0) ^ (size_t)0x55555555U);
+#endif
+ magic |= (size_t)8U; /* ensure nonzero */
+ magic &= ~(size_t)7U; /* improve chances of fault for bad values */
+ /* Until memory modes commonly available, use volatile-write */
+ (*(volatile size_t *)(&(mparams.magic))) = magic;
+ }
+ }
+
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ return 1;
+}
+
+/* support for mallopt */
+static int change_mparam(int param_number, int value) {
+ size_t val;
+ ensure_initialization();
+ val = (value == -1)? MAX_SIZE_T : (size_t)value;
+ switch(param_number) {
+ case M_TRIM_THRESHOLD:
+ mparams.trim_threshold = val;
+ return 1;
+ case M_GRANULARITY:
+ if (val >= mparams.page_size && ((val & (val-1)) == 0)) {
+ mparams.granularity = val;
+ return 1;
+ }
+ else
+ return 0;
+ case M_MMAP_THRESHOLD:
+ mparams.mmap_threshold = val;
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+#if DEBUG
+/* ------------------------- Debugging Support --------------------------- */
+
+/* Check properties of any chunk, whether free, inuse, mmapped etc */
+static void do_check_any_chunk(mstate m, mchunkptr p) {
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
+ assert(ok_address(m, p));
+}
+
+/* Check properties of top chunk */
+static void do_check_top_chunk(mstate m, mchunkptr p) {
+ msegmentptr sp = segment_holding(m, (char*)p);
+ size_t sz = p->head & ~INUSE_BITS; /* third-lowest bit can be set! */
+ assert(sp != 0);
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
+ assert(ok_address(m, p));
+ assert(sz == m->topsize);
+ assert(sz > 0);
+ assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE);
+ assert(pinuse(p));
+ assert(!pinuse(chunk_plus_offset(p, sz)));
+}
+
+/* Check properties of (inuse) mmapped chunks */
+static void do_check_mmapped_chunk(mstate m, mchunkptr p) {
+ size_t sz = chunksize(p);
+ size_t len = (sz + (p->prev_foot) + MMAP_FOOT_PAD);
+ assert(is_mmapped(p));
+ assert(use_mmap(m));
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
+ assert(ok_address(m, p));
+ assert(!is_small(sz));
+ assert((len & (mparams.page_size-SIZE_T_ONE)) == 0);
+ assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD);
+ assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0);
+}
+
+/* Check properties of inuse chunks */
+static void do_check_inuse_chunk(mstate m, mchunkptr p) {
+ do_check_any_chunk(m, p);
+ assert(is_inuse(p));
+ assert(next_pinuse(p));
+ /* If not pinuse and not mmapped, previous chunk has OK offset */
+ assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p);
+ if (is_mmapped(p))
+ do_check_mmapped_chunk(m, p);
+}
+
+/* Check properties of free chunks */
+static void do_check_free_chunk(mstate m, mchunkptr p) {
+ size_t sz = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, sz);
+ do_check_any_chunk(m, p);
+ assert(!is_inuse(p));
+ assert(!next_pinuse(p));
+ assert (!is_mmapped(p));
+ if (p != m->dv && p != m->top) {
+ if (sz >= MIN_CHUNK_SIZE) {
+ assert((sz & CHUNK_ALIGN_MASK) == 0);
+ assert(is_aligned(chunk2mem(p)));
+ assert(next->prev_foot == sz);
+ assert(pinuse(p));
+ assert (next == m->top || is_inuse(next));
+ assert(p->fd->bk == p);
+ assert(p->bk->fd == p);
+ }
+ else /* markers are always of size SIZE_T_SIZE */
+ assert(sz == SIZE_T_SIZE);
+ }
+}
+
+/* Check properties of malloced chunks at the point they are malloced */
+static void do_check_malloced_chunk(mstate m, void* mem, size_t s) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ size_t sz = p->head & ~INUSE_BITS;
+ do_check_inuse_chunk(m, p);
+ assert((sz & CHUNK_ALIGN_MASK) == 0);
+ assert(sz >= MIN_CHUNK_SIZE);
+ assert(sz >= s);
+ /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */
+ assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE));
+ }
+}
+
+/* Check a tree and its subtrees. */
+static void do_check_tree(mstate m, tchunkptr t) {
+ tchunkptr head = 0;
+ tchunkptr u = t;
+ bindex_t tindex = t->index;
+ size_t tsize = chunksize(t);
+ bindex_t idx;
+ compute_tree_index(tsize, idx);
+ assert(tindex == idx);
+ assert(tsize >= MIN_LARGE_SIZE);
+ assert(tsize >= minsize_for_tree_index(idx));
+ assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1))));
+
+ do { /* traverse through chain of same-sized nodes */
+ do_check_any_chunk(m, ((mchunkptr)u));
+ assert(u->index == tindex);
+ assert(chunksize(u) == tsize);
+ assert(!is_inuse(u));
+ assert(!next_pinuse(u));
+ assert(u->fd->bk == u);
+ assert(u->bk->fd == u);
+ if (u->parent == 0) {
+ assert(u->child[0] == 0);
+ assert(u->child[1] == 0);
+ }
+ else {
+ assert(head == 0); /* only one node on chain has parent */
+ head = u;
+ assert(u->parent != u);
+ assert (u->parent->child[0] == u ||
+ u->parent->child[1] == u ||
+ *((tbinptr*)(u->parent)) == u);
+ if (u->child[0] != 0) {
+ assert(u->child[0]->parent == u);
+ assert(u->child[0] != u);
+ do_check_tree(m, u->child[0]);
+ }
+ if (u->child[1] != 0) {
+ assert(u->child[1]->parent == u);
+ assert(u->child[1] != u);
+ do_check_tree(m, u->child[1]);
+ }
+ if (u->child[0] != 0 && u->child[1] != 0) {
+ assert(chunksize(u->child[0]) < chunksize(u->child[1]));
+ }
+ }
+ u = u->fd;
+ } while (u != t);
+ assert(head != 0);
+}
+
+/* Check all the chunks in a treebin. */
+static void do_check_treebin(mstate m, bindex_t i) {
+ tbinptr* tb = treebin_at(m, i);
+ tchunkptr t = *tb;
+ int empty = (m->treemap & (1U << i)) == 0;
+ if (t == 0)
+ assert(empty);
+ if (!empty)
+ do_check_tree(m, t);
+}
+
+/* Check all the chunks in a smallbin. */
+static void do_check_smallbin(mstate m, bindex_t i) {
+ sbinptr b = smallbin_at(m, i);
+ mchunkptr p = b->bk;
+ unsigned int empty = (m->smallmap & (1U << i)) == 0;
+ if (p == b)
+ assert(empty);
+ if (!empty) {
+ for (; p != b; p = p->bk) {
+ size_t size = chunksize(p);
+ mchunkptr q;
+ /* each chunk claims to be free */
+ do_check_free_chunk(m, p);
+ /* chunk belongs in bin */
+ assert(small_index(size) == i);
+ assert(p->bk == b || chunksize(p->bk) == chunksize(p));
+ /* chunk is followed by an inuse chunk */
+ q = next_chunk(p);
+ if (q->head != FENCEPOST_HEAD)
+ do_check_inuse_chunk(m, q);
+ }
+ }
+}
+
+/* Find x in a bin. Used in other check functions. */
+static int bin_find(mstate m, mchunkptr x) {
+ size_t size = chunksize(x);
+ if (is_small(size)) {
+ bindex_t sidx = small_index(size);
+ sbinptr b = smallbin_at(m, sidx);
+ if (smallmap_is_marked(m, sidx)) {
+ mchunkptr p = b;
+ do {
+ if (p == x)
+ return 1;
+ } while ((p = p->fd) != b);
+ }
+ }
+ else {
+ bindex_t tidx;
+ compute_tree_index(size, tidx);
+ if (treemap_is_marked(m, tidx)) {
+ tchunkptr t = *treebin_at(m, tidx);
+ size_t sizebits = size << leftshift_for_tree_index(tidx);
+ while (t != 0 && chunksize(t) != size) {
+ t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
+ sizebits <<= 1;
+ }
+ if (t != 0) {
+ tchunkptr u = t;
+ do {
+ if (u == (tchunkptr)x)
+ return 1;
+ } while ((u = u->fd) != t);
+ }
+ }
+ }
+ return 0;
+}
+
+/* Traverse each chunk and check it; return total */
+static size_t traverse_and_check(mstate m) {
+ size_t sum = 0;
+ if (is_initialized(m)) {
+ msegmentptr s = &m->seg;
+ sum += m->topsize + TOP_FOOT_SIZE;
+ while (s != 0) {
+ mchunkptr q = align_as_chunk(s->base);
+ mchunkptr lastq = 0;
+ assert(pinuse(q));
+ while (segment_holds(s, q) &&
+ q != m->top && q->head != FENCEPOST_HEAD) {
+ sum += chunksize(q);
+ if (is_inuse(q)) {
+ assert(!bin_find(m, q));
+ do_check_inuse_chunk(m, q);
+ }
+ else {
+ assert(q == m->dv || bin_find(m, q));
+ assert(lastq == 0 || is_inuse(lastq)); /* Not 2 consecutive free */
+ do_check_free_chunk(m, q);
+ }
+ lastq = q;
+ q = next_chunk(q);
+ }
+ s = s->next;
+ }
+ }
+ return sum;
+}
+
+
+/* Check all properties of malloc_state. */
+static void do_check_malloc_state(mstate m) {
+ bindex_t i;
+ size_t total;
+ /* check bins */
+ for (i = 0; i < NSMALLBINS; ++i)
+ do_check_smallbin(m, i);
+ for (i = 0; i < NTREEBINS; ++i)
+ do_check_treebin(m, i);
+
+ if (m->dvsize != 0) { /* check dv chunk */
+ do_check_any_chunk(m, m->dv);
+ assert(m->dvsize == chunksize(m->dv));
+ assert(m->dvsize >= MIN_CHUNK_SIZE);
+ assert(bin_find(m, m->dv) == 0);
+ }
+
+ if (m->top != 0) { /* check top chunk */
+ do_check_top_chunk(m, m->top);
+ /*assert(m->topsize == chunksize(m->top)); redundant */
+ assert(m->topsize > 0);
+ assert(bin_find(m, m->top) == 0);
+ }
+
+ total = traverse_and_check(m);
+ assert(total <= m->footprint);
+ assert(m->footprint <= m->max_footprint);
+}
+#endif /* DEBUG */
+
+/* ----------------------------- statistics ------------------------------ */
+
+#if !NO_MALLINFO
+static struct mallinfo internal_mallinfo(mstate m) {
+ struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+ ensure_initialization();
+ if (!PREACTION(m)) {
+ check_malloc_state(m);
+ if (is_initialized(m)) {
+ size_t nfree = SIZE_T_ONE; /* top always free */
+ size_t mfree = m->topsize + TOP_FOOT_SIZE;
+ size_t sum = mfree;
+ msegmentptr s = &m->seg;
+ while (s != 0) {
+ mchunkptr q = align_as_chunk(s->base);
+ while (segment_holds(s, q) &&
+ q != m->top && q->head != FENCEPOST_HEAD) {
+ size_t sz = chunksize(q);
+ sum += sz;
+ if (!is_inuse(q)) {
+ mfree += sz;
+ ++nfree;
+ }
+ q = next_chunk(q);
+ }
+ s = s->next;
+ }
+
+ nm.arena = sum;
+ nm.ordblks = nfree;
+ nm.hblkhd = m->footprint - sum;
+ nm.usmblks = m->max_footprint;
+ nm.uordblks = m->footprint - mfree;
+ nm.fordblks = mfree;
+ nm.keepcost = m->topsize;
+ }
+
+ POSTACTION(m);
+ }
+ return nm;
+}
+#endif /* !NO_MALLINFO */
+
+#if !NO_MALLOC_STATS
+static void internal_malloc_stats(mstate m) {
+ ensure_initialization();
+ if (!PREACTION(m)) {
+ size_t maxfp = 0;
+ size_t fp = 0;
+ size_t used = 0;
+ check_malloc_state(m);
+ if (is_initialized(m)) {
+ msegmentptr s = &m->seg;
+ maxfp = m->max_footprint;
+ fp = m->footprint;
+ used = fp - (m->topsize + TOP_FOOT_SIZE);
+
+ while (s != 0) {
+ mchunkptr q = align_as_chunk(s->base);
+ while (segment_holds(s, q) &&
+ q != m->top && q->head != FENCEPOST_HEAD) {
+ if (!is_inuse(q))
+ used -= chunksize(q);
+ q = next_chunk(q);
+ }
+ s = s->next;
+ }
+ }
+ POSTACTION(m); /* drop lock */
+ fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp));
+ fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp));
+ fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used));
+ }
+}
+#endif /* NO_MALLOC_STATS */
+
+/* ----------------------- Operations on smallbins ----------------------- */
+
+/*
+ Various forms of linking and unlinking are defined as macros. Even
+ the ones for trees, which are very long but have very short typical
+ paths. This is ugly but reduces reliance on inlining support of
+ compilers.
+*/
+
+/* Link a free chunk into a smallbin */
+#define insert_small_chunk(M, P, S) {\
+ bindex_t I = small_index(S);\
+ mchunkptr B = smallbin_at(M, I);\
+ mchunkptr F = B;\
+ assert(S >= MIN_CHUNK_SIZE);\
+ if (!smallmap_is_marked(M, I))\
+ mark_smallmap(M, I);\
+ else if (RTCHECK(ok_address(M, B->fd)))\
+ F = B->fd;\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ B->fd = P;\
+ F->bk = P;\
+ P->fd = F;\
+ P->bk = B;\
+}
+
+/* Unlink a chunk from a smallbin */
+#define unlink_small_chunk(M, P, S) {\
+ mchunkptr F = P->fd;\
+ mchunkptr B = P->bk;\
+ bindex_t I = small_index(S);\
+ assert(P != B);\
+ assert(P != F);\
+ assert(chunksize(P) == small_index2size(I));\
+ if (RTCHECK(F == smallbin_at(M,I) || (ok_address(M, F) && F->bk == P))) { \
+ if (B == F) {\
+ clear_smallmap(M, I);\
+ }\
+ else if (RTCHECK(B == smallbin_at(M,I) ||\
+ (ok_address(M, B) && B->fd == P))) {\
+ F->bk = B;\
+ B->fd = F;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+}
+
+/* Unlink the first chunk from a smallbin */
+#define unlink_first_small_chunk(M, B, P, I) {\
+ mchunkptr F = P->fd;\
+ assert(P != B);\
+ assert(P != F);\
+ assert(chunksize(P) == small_index2size(I));\
+ if (B == F) {\
+ clear_smallmap(M, I);\
+ }\
+ else if (RTCHECK(ok_address(M, F) && F->bk == P)) {\
+ F->bk = B;\
+ B->fd = F;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+}
+
+/* Replace dv node, binning the old one */
+/* Used only when dvsize known to be small */
+#define replace_dv(M, P, S) {\
+ size_t DVS = M->dvsize;\
+ assert(is_small(DVS));\
+ if (DVS != 0) {\
+ mchunkptr DV = M->dv;\
+ insert_small_chunk(M, DV, DVS);\
+ }\
+ M->dvsize = S;\
+ M->dv = P;\
+}
+
+/* ------------------------- Operations on trees ------------------------- */
+
+/* Insert chunk into tree */
+#define insert_large_chunk(M, X, S) {\
+ tbinptr* H;\
+ bindex_t I;\
+ compute_tree_index(S, I);\
+ H = treebin_at(M, I);\
+ X->index = I;\
+ X->child[0] = X->child[1] = 0;\
+ if (!treemap_is_marked(M, I)) {\
+ mark_treemap(M, I);\
+ *H = X;\
+ X->parent = (tchunkptr)H;\
+ X->fd = X->bk = X;\
+ }\
+ else {\
+ tchunkptr T = *H;\
+ size_t K = S << leftshift_for_tree_index(I);\
+ for (;;) {\
+ if (chunksize(T) != S) {\
+ tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\
+ K <<= 1;\
+ if (*C != 0)\
+ T = *C;\
+ else if (RTCHECK(ok_address(M, C))) {\
+ *C = X;\
+ X->parent = T;\
+ X->fd = X->bk = X;\
+ break;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ break;\
+ }\
+ }\
+ else {\
+ tchunkptr F = T->fd;\
+ if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\
+ T->fd = F->bk = X;\
+ X->fd = F;\
+ X->bk = T;\
+ X->parent = 0;\
+ break;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ break;\
+ }\
+ }\
+ }\
+ }\
+}
+
+/*
+ Unlink steps:
+
+ 1. If x is a chained node, unlink it from its same-sized fd/bk links
+ and choose its bk node as its replacement.
+ 2. If x was the last node of its size, but not a leaf node, it must
+ be replaced with a leaf node (not merely one with an open left or
+ right), to make sure that lefts and rights of descendents
+ correspond properly to bit masks. We use the rightmost descendent
+ of x. We could use any other leaf, but this is easy to locate and
+ tends to counteract removal of leftmosts elsewhere, and so keeps
+ paths shorter than minimally guaranteed. This doesn't loop much
+ because on average a node in a tree is near the bottom.
+ 3. If x is the base of a chain (i.e., has parent links) relink
+ x's parent and children to x's replacement (or null if none).
+*/
+
+#define unlink_large_chunk(M, X) {\
+ tchunkptr XP = X->parent;\
+ tchunkptr R;\
+ if (X->bk != X) {\
+ tchunkptr F = X->fd;\
+ R = X->bk;\
+ if (RTCHECK(ok_address(M, F) && F->bk == X && R->fd == X)) {\
+ F->bk = R;\
+ R->fd = F;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ else {\
+ tchunkptr* RP;\
+ if (((R = *(RP = &(X->child[1]))) != 0) ||\
+ ((R = *(RP = &(X->child[0]))) != 0)) {\
+ tchunkptr* CP;\
+ while ((*(CP = &(R->child[1])) != 0) ||\
+ (*(CP = &(R->child[0])) != 0)) {\
+ R = *(RP = CP);\
+ }\
+ if (RTCHECK(ok_address(M, RP)))\
+ *RP = 0;\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ }\
+ if (XP != 0) {\
+ tbinptr* H = treebin_at(M, X->index);\
+ if (X == *H) {\
+ if ((*H = R) == 0) \
+ clear_treemap(M, X->index);\
+ }\
+ else if (RTCHECK(ok_address(M, XP))) {\
+ if (XP->child[0] == X) \
+ XP->child[0] = R;\
+ else \
+ XP->child[1] = R;\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ if (R != 0) {\
+ if (RTCHECK(ok_address(M, R))) {\
+ tchunkptr C0, C1;\
+ R->parent = XP;\
+ if ((C0 = X->child[0]) != 0) {\
+ if (RTCHECK(ok_address(M, C0))) {\
+ R->child[0] = C0;\
+ C0->parent = R;\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ if ((C1 = X->child[1]) != 0) {\
+ if (RTCHECK(ok_address(M, C1))) {\
+ R->child[1] = C1;\
+ C1->parent = R;\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+}
+
+/* Relays to large vs small bin operations */
+
+#define insert_chunk(M, P, S)\
+ if (is_small(S)) insert_small_chunk(M, P, S)\
+ else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); }
+
+#define unlink_chunk(M, P, S)\
+ if (is_small(S)) unlink_small_chunk(M, P, S)\
+ else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); }
+
+
+/* Relays to internal calls to malloc/free from realloc, memalign etc */
+
+#if ONLY_MSPACES
+#define internal_malloc(m, b) mspace_malloc(m, b)
+#define internal_free(m, mem) mspace_free(m,mem);
+#else /* ONLY_MSPACES */
+#if MSPACES
+#define internal_malloc(m, b)\
+ ((m == gm)? dlmalloc(b) : mspace_malloc(m, b))
+#define internal_free(m, mem)\
+ if (m == gm) dlfree(mem); else mspace_free(m,mem);
+#else /* MSPACES */
+#define internal_malloc(m, b) dlmalloc(b)
+#define internal_free(m, mem) dlfree(mem)
+#endif /* MSPACES */
+#endif /* ONLY_MSPACES */
+
+/* ----------------------- Direct-mmapping chunks ----------------------- */
+
+/*
+ Directly mmapped chunks are set up with an offset to the start of
+ the mmapped region stored in the prev_foot field of the chunk. This
+ allows reconstruction of the required argument to MUNMAP when freed,
+ and also allows adjustment of the returned chunk to meet alignment
+ requirements (especially in memalign).
+*/
+
+/* Malloc using mmap */
+static void* mmap_alloc(mstate m, size_t nb) {
+ size_t mmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
+ if (m->footprint_limit != 0) {
+ size_t fp = m->footprint + mmsize;
+ if (fp <= m->footprint || fp > m->footprint_limit)
+ return 0;
+ }
+ if (mmsize > nb) { /* Check for wrap around 0 */
+ char* mm = (char*)(CALL_DIRECT_MMAP(mmsize));
+ if (mm != CMFAIL) {
+ size_t offset = align_offset(chunk2mem(mm));
+ size_t psize = mmsize - offset - MMAP_FOOT_PAD;
+ mchunkptr p = (mchunkptr)(mm + offset);
+ p->prev_foot = offset;
+ p->head = psize;
+ mark_inuse_foot(m, p, psize);
+ chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;
+ chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;
+
+ if (m->least_addr == 0 || mm < m->least_addr)
+ m->least_addr = mm;
+ if ((m->footprint += mmsize) > m->max_footprint)
+ m->max_footprint = m->footprint;
+ assert(is_aligned(chunk2mem(p)));
+ check_mmapped_chunk(m, p);
+ return chunk2mem(p);
+ }
+ }
+ return 0;
+}
+
+/* Realloc using mmap */
+static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb, int flags) {
+ size_t oldsize = chunksize(oldp);
+ flags = flags; /* placate people compiling -Wunused */
+ if (is_small(nb)) /* Can't shrink mmap regions below small size */
+ return 0;
+ /* Keep old chunk if big enough but not too big */
+ if (oldsize >= nb + SIZE_T_SIZE &&
+ (oldsize - nb) <= (mparams.granularity << 1))
+ return oldp;
+ else {
+ size_t offset = oldp->prev_foot;
+ size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD;
+ size_t newmmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
+ char* cp = (char*)CALL_MREMAP((char*)oldp - offset,
+ oldmmsize, newmmsize, flags);
+ if (cp != CMFAIL) {
+ mchunkptr newp = (mchunkptr)(cp + offset);
+ size_t psize = newmmsize - offset - MMAP_FOOT_PAD;
+ newp->head = psize;
+ mark_inuse_foot(m, newp, psize);
+ chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD;
+ chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0;
+
+ if (cp < m->least_addr)
+ m->least_addr = cp;
+ if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint)
+ m->max_footprint = m->footprint;
+ check_mmapped_chunk(m, newp);
+ return newp;
+ }
+ }
+ return 0;
+}
+
+
+/* -------------------------- mspace management -------------------------- */
+
+/* Initialize top chunk and its size */
+static void init_top(mstate m, mchunkptr p, size_t psize) {
+ /* Ensure alignment */
+ size_t offset = align_offset(chunk2mem(p));
+ p = (mchunkptr)((char*)p + offset);
+ psize -= offset;
+
+ m->top = p;
+ m->topsize = psize;
+ p->head = psize | PINUSE_BIT;
+ /* set size of fake trailing chunk holding overhead space only once */
+ chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE;
+ m->trim_check = mparams.trim_threshold; /* reset on each update */
+}
+
+/* Initialize bins for a new mstate that is otherwise zeroed out */
+static void init_bins(mstate m) {
+ /* Establish circular links for smallbins */
+ bindex_t i;
+ for (i = 0; i < NSMALLBINS; ++i) {
+ sbinptr bin = smallbin_at(m,i);
+ bin->fd = bin->bk = bin;
+ }
+}
+
+#if PROCEED_ON_ERROR
+
+/* default corruption action */
+static void reset_on_error(mstate m) {
+ int i;
+ ++malloc_corruption_error_count;
+ /* Reinitialize fields to forget about all memory */
+ m->smallmap = m->treemap = 0;
+ m->dvsize = m->topsize = 0;
+ m->seg.base = 0;
+ m->seg.size = 0;
+ m->seg.next = 0;
+ m->top = m->dv = 0;
+ for (i = 0; i < NTREEBINS; ++i)
+ *treebin_at(m, i) = 0;
+ init_bins(m);
+}
+#endif /* PROCEED_ON_ERROR */
+
+/* Allocate chunk and prepend remainder with chunk in successor base. */
+static void* prepend_alloc(mstate m, char* newbase, char* oldbase,
+ size_t nb) {
+ mchunkptr p = align_as_chunk(newbase);
+ mchunkptr oldfirst = align_as_chunk(oldbase);
+ size_t psize = (char*)oldfirst - (char*)p;
+ mchunkptr q = chunk_plus_offset(p, nb);
+ size_t qsize = psize - nb;
+ set_size_and_pinuse_of_inuse_chunk(m, p, nb);
+
+ assert((char*)oldfirst > (char*)q);
+ assert(pinuse(oldfirst));
+ assert(qsize >= MIN_CHUNK_SIZE);
+
+ /* consolidate remainder with first chunk of old base */
+ if (oldfirst == m->top) {
+ size_t tsize = m->topsize += qsize;
+ m->top = q;
+ q->head = tsize | PINUSE_BIT;
+ check_top_chunk(m, q);
+ }
+ else if (oldfirst == m->dv) {
+ size_t dsize = m->dvsize += qsize;
+ m->dv = q;
+ set_size_and_pinuse_of_free_chunk(q, dsize);
+ }
+ else {
+ if (!is_inuse(oldfirst)) {
+ size_t nsize = chunksize(oldfirst);
+ unlink_chunk(m, oldfirst, nsize);
+ oldfirst = chunk_plus_offset(oldfirst, nsize);
+ qsize += nsize;
+ }
+ set_free_with_pinuse(q, qsize, oldfirst);
+ insert_chunk(m, q, qsize);
+ check_free_chunk(m, q);
+ }
+
+ check_malloced_chunk(m, chunk2mem(p), nb);
+ return chunk2mem(p);
+}
+
+/* Add a segment to hold a new noncontiguous region */
+static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {
+ /* Determine locations and sizes of segment, fenceposts, old top */
+ char* old_top = (char*)m->top;
+ msegmentptr oldsp = segment_holding(m, old_top);
+ char* old_end = oldsp->base + oldsp->size;
+ size_t ssize = pad_request(sizeof(struct malloc_segment));
+ char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
+ size_t offset = align_offset(chunk2mem(rawsp));
+ char* asp = rawsp + offset;
+ char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp;
+ mchunkptr sp = (mchunkptr)csp;
+ msegmentptr ss = (msegmentptr)(chunk2mem(sp));
+ mchunkptr tnext = chunk_plus_offset(sp, ssize);
+ mchunkptr p = tnext;
+ int nfences = 0;
+
+ /* reset top to new space */
+ init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
+
+ /* Set up segment record */
+ assert(is_aligned(ss));
+ set_size_and_pinuse_of_inuse_chunk(m, sp, ssize);
+ *ss = m->seg; /* Push current record */
+ m->seg.base = tbase;
+ m->seg.size = tsize;
+ m->seg.sflags = mmapped;
+ m->seg.next = ss;
+
+ /* Insert trailing fenceposts */
+ for (;;) {
+ mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE);
+ p->head = FENCEPOST_HEAD;
+ ++nfences;
+ if ((char*)(&(nextp->head)) < old_end)
+ p = nextp;
+ else
+ break;
+ }
+ assert(nfences >= 2);
+
+ /* Insert the rest of old top into a bin as an ordinary free chunk */
+ if (csp != old_top) {
+ mchunkptr q = (mchunkptr)old_top;
+ size_t psize = csp - old_top;
+ mchunkptr tn = chunk_plus_offset(q, psize);
+ set_free_with_pinuse(q, psize, tn);
+ insert_chunk(m, q, psize);
+ }
+
+ check_top_chunk(m, m->top);
+}
+
+/* -------------------------- System allocation -------------------------- */
+
+/* Get memory from system using MORECORE or MMAP */
+static void* sys_alloc(mstate m, size_t nb) {
+ char* tbase = CMFAIL;
+ size_t tsize = 0;
+ flag_t mmap_flag = 0;
+ size_t asize; /* allocation size */
+
+ ensure_initialization();
+
+ /* Directly map large chunks, but only if already initialized */
+ if (use_mmap(m) && nb >= mparams.mmap_threshold && m->topsize != 0) {
+ void* mem = mmap_alloc(m, nb);
+ if (mem != 0)
+ return mem;
+ }
+
+ asize = granularity_align(nb + SYS_ALLOC_PADDING);
+ if (asize <= nb)
+ return 0; /* wraparound */
+ if (m->footprint_limit != 0) {
+ size_t fp = m->footprint + asize;
+ if (fp <= m->footprint || fp > m->footprint_limit)
+ return 0;
+ }
+
+ /*
+ Try getting memory in any of three ways (in most-preferred to
+ least-preferred order):
+ 1. A call to MORECORE that can normally contiguously extend memory.
+ (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or
+ or main space is mmapped or a previous contiguous call failed)
+ 2. A call to MMAP new space (disabled if not HAVE_MMAP).
+ Note that under the default settings, if MORECORE is unable to
+ fulfill a request, and HAVE_MMAP is true, then mmap is
+ used as a noncontiguous system allocator. This is a useful backup
+ strategy for systems with holes in address spaces -- in this case
+ sbrk cannot contiguously expand the heap, but mmap may be able to
+ find space.
+ 3. A call to MORECORE that cannot usually contiguously extend memory.
+ (disabled if not HAVE_MORECORE)
+
+ In all cases, we need to request enough bytes from system to ensure
+ we can malloc nb bytes upon success, so pad with enough space for
+ top_foot, plus alignment-pad to make sure we don't lose bytes if
+ not on boundary, and round this up to a granularity unit.
+ */
+
+ if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {
+ char* br = CMFAIL;
+ msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+
+ if (ss == 0) { /* First time through or recovery */
+ char* base = (char*)CALL_MORECORE(0);
+ if (base != CMFAIL) {
+ size_t fp;
+ /* Adjust to end on a page boundary */
+ if (!is_page_aligned(base))
+ asize += (page_align((size_t)base) - (size_t)base);
+ fp = m->footprint + asize; /* recheck limits */
+ if (asize > nb && asize < HALF_MAX_SIZE_T &&
+ (m->footprint_limit == 0 ||
+ (fp > m->footprint && fp <= m->footprint_limit)) &&
+ (br = (char*)(CALL_MORECORE(asize))) == base) {
+ tbase = base;
+ tsize = asize;
+ }
+ }
+ }
+ else {
+ /* Subtract out existing available top space from MORECORE request. */
+ asize = granularity_align(nb - m->topsize + SYS_ALLOC_PADDING);
+ /* Use mem here only if it did continuously extend old space */
+ if (asize < HALF_MAX_SIZE_T &&
+ (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {
+ tbase = br;
+ tsize = asize;
+ }
+ }
+
+ if (tbase == CMFAIL) { /* Cope with partial failure */
+ if (br != CMFAIL) { /* Try to use/extend the space we did get */
+ if (asize < HALF_MAX_SIZE_T &&
+ asize < nb + SYS_ALLOC_PADDING) {
+ size_t esize = granularity_align(nb + SYS_ALLOC_PADDING - asize);
+ if (esize < HALF_MAX_SIZE_T) {
+ char* end = (char*)CALL_MORECORE(esize);
+ if (end != CMFAIL)
+ asize += esize;
+ else { /* Can't use; try to release */
+ (void) CALL_MORECORE(-asize);
+ br = CMFAIL;
+ }
+ }
+ }
+ }
+ if (br != CMFAIL) { /* Use the space we did get */
+ tbase = br;
+ tsize = asize;
+ }
+ else
+ disable_contiguous(m); /* Don't try contiguous path in the future */
+ }
+
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ }
+
+ if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */
+ char* mp = (char*)(CALL_MMAP(asize));
+ if (mp != CMFAIL) {
+ tbase = mp;
+ tsize = asize;
+ mmap_flag = USE_MMAP_BIT;
+ }
+ }
+
+ if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */
+ if (asize < HALF_MAX_SIZE_T) {
+ char* br = CMFAIL;
+ char* end = CMFAIL;
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+ br = (char*)(CALL_MORECORE(asize));
+ end = (char*)(CALL_MORECORE(0));
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ if (br != CMFAIL && end != CMFAIL && br < end) {
+ size_t ssize = end - br;
+ if (ssize > nb + TOP_FOOT_SIZE) {
+ tbase = br;
+ tsize = ssize;
+ }
+ }
+ }
+ }
+
+ if (tbase != CMFAIL) {
+
+ if ((m->footprint += tsize) > m->max_footprint)
+ m->max_footprint = m->footprint;
+
+ if (!is_initialized(m)) { /* first-time initialization */
+ if (m->least_addr == 0 || tbase < m->least_addr)
+ m->least_addr = tbase;
+ m->seg.base = tbase;
+ m->seg.size = tsize;
+ m->seg.sflags = mmap_flag;
+ m->magic = mparams.magic;
+ m->release_checks = MAX_RELEASE_CHECK_RATE;
+ init_bins(m);
+#if !ONLY_MSPACES
+ if (is_global(m))
+ init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
+ else
+#endif
+ {
+ /* Offset top by embedded malloc_state */
+ mchunkptr mn = next_chunk(mem2chunk(m));
+ init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);
+ }
+ }
+
+ else {
+ /* Try to merge with an existing segment */
+ msegmentptr sp = &m->seg;
+ /* Only consider most recent segment if traversal suppressed */
+ while (sp != 0 && tbase != sp->base + sp->size)
+ sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
+ if (sp != 0 &&
+ !is_extern_segment(sp) &&
+ (sp->sflags & USE_MMAP_BIT) == mmap_flag &&
+ segment_holds(sp, m->top)) { /* append */
+ sp->size += tsize;
+ init_top(m, m->top, m->topsize + tsize);
+ }
+ else {
+ if (tbase < m->least_addr)
+ m->least_addr = tbase;
+ sp = &m->seg;
+ while (sp != 0 && sp->base != tbase + tsize)
+ sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
+ if (sp != 0 &&
+ !is_extern_segment(sp) &&
+ (sp->sflags & USE_MMAP_BIT) == mmap_flag) {
+ char* oldbase = sp->base;
+ sp->base = tbase;
+ sp->size += tsize;
+ return prepend_alloc(m, tbase, oldbase, nb);
+ }
+ else
+ add_segment(m, tbase, tsize, mmap_flag);
+ }
+ }
+
+ if (nb < m->topsize) { /* Allocate from new or extended top space */
+ size_t rsize = m->topsize -= nb;
+ mchunkptr p = m->top;
+ mchunkptr r = m->top = chunk_plus_offset(p, nb);
+ r->head = rsize | PINUSE_BIT;
+ set_size_and_pinuse_of_inuse_chunk(m, p, nb);
+ check_top_chunk(m, m->top);
+ check_malloced_chunk(m, chunk2mem(p), nb);
+ return chunk2mem(p);
+ }
+ }
+
+ MALLOC_FAILURE_ACTION;
+ return 0;
+}
+
+/* ----------------------- system deallocation -------------------------- */
+
+/* Unmap and unlink any mmapped segments that don't contain used chunks */
+static size_t release_unused_segments(mstate m) {
+ size_t released = 0;
+ int nsegs = 0;
+ msegmentptr pred = &m->seg;
+ msegmentptr sp = pred->next;
+ while (sp != 0) {
+ char* base = sp->base;
+ size_t size = sp->size;
+ msegmentptr next = sp->next;
+ ++nsegs;
+ if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {
+ mchunkptr p = align_as_chunk(base);
+ size_t psize = chunksize(p);
+ /* Can unmap if first chunk holds entire segment and not pinned */
+ if (!is_inuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {
+ tchunkptr tp = (tchunkptr)p;
+ assert(segment_holds(sp, (char*)sp));
+ if (p == m->dv) {
+ m->dv = 0;
+ m->dvsize = 0;
+ }
+ else {
+ unlink_large_chunk(m, tp);
+ }
+ if (CALL_MUNMAP(base, size) == 0) {
+ released += size;
+ m->footprint -= size;
+ /* unlink obsoleted record */
+ sp = pred;
+ sp->next = next;
+ }
+ else { /* back out if cannot unmap */
+ insert_large_chunk(m, tp, psize);
+ }
+ }
+ }
+ if (NO_SEGMENT_TRAVERSAL) /* scan only first segment */
+ break;
+ pred = sp;
+ sp = next;
+ }
+ /* Reset check counter */
+ m->release_checks = ((nsegs > MAX_RELEASE_CHECK_RATE)?
+ nsegs : MAX_RELEASE_CHECK_RATE);
+ return released;
+}
+
+static int sys_trim(mstate m, size_t pad) {
+ size_t released = 0;
+ ensure_initialization();
+ if (pad < MAX_REQUEST && is_initialized(m)) {
+ pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */
+
+ if (m->topsize > pad) {
+ /* Shrink top space in granularity-size units, keeping at least one */
+ size_t unit = mparams.granularity;
+ size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -
+ SIZE_T_ONE) * unit;
+ msegmentptr sp = segment_holding(m, (char*)m->top);
+
+ if (!is_extern_segment(sp)) {
+ if (is_mmapped_segment(sp)) {
+ if (HAVE_MMAP &&
+ sp->size >= extra &&
+ !has_segment_link(m, sp)) { /* can't shrink if pinned */
+ size_t newsize = sp->size - extra;
+ /* Prefer mremap, fall back to munmap */
+ if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||
+ (CALL_MUNMAP(sp->base + newsize, extra) == 0)) {
+ released = extra;
+ }
+ }
+ }
+ else if (HAVE_MORECORE) {
+ if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */
+ extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+ {
+ /* Make sure end of memory is where we last set it. */
+ char* old_br = (char*)(CALL_MORECORE(0));
+ if (old_br == sp->base + sp->size) {
+ char* rel_br = (char*)(CALL_MORECORE(-extra));
+ char* new_br = (char*)(CALL_MORECORE(0));
+ if (rel_br != CMFAIL && new_br < old_br)
+ released = old_br - new_br;
+ }
+ }
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ }
+ }
+
+ if (released != 0) {
+ sp->size -= released;
+ m->footprint -= released;
+ init_top(m, m->top, m->topsize - released);
+ check_top_chunk(m, m->top);
+ }
+ }
+
+ /* Unmap any unused mmapped segments */
+ if (HAVE_MMAP)
+ released += release_unused_segments(m);
+
+ /* On failure, disable autotrim to avoid repeated failed future calls */
+ if (released == 0 && m->topsize > m->trim_check)
+ m->trim_check = MAX_SIZE_T;
+ }
+
+ return (released != 0)? 1 : 0;
+}
+
+/* Consolidate and bin a chunk. Differs from exported versions
+ of free mainly in that the chunk need not be marked as inuse.
+*/
+static void dispose_chunk(mstate m, mchunkptr p, size_t psize) {
+ mchunkptr next = chunk_plus_offset(p, psize);
+ if (!pinuse(p)) {
+ mchunkptr prev;
+ size_t prevsize = p->prev_foot;
+ if (is_mmapped(p)) {
+ psize += prevsize + MMAP_FOOT_PAD;
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
+ m->footprint -= psize;
+ return;
+ }
+ prev = chunk_minus_offset(p, prevsize);
+ psize += prevsize;
+ p = prev;
+ if (RTCHECK(ok_address(m, prev))) { /* consolidate backward */
+ if (p != m->dv) {
+ unlink_chunk(m, p, prevsize);
+ }
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
+ m->dvsize = psize;
+ set_free_with_pinuse(p, psize, next);
+ return;
+ }
+ }
+ else {
+ CORRUPTION_ERROR_ACTION(m);
+ return;
+ }
+ }
+ if (RTCHECK(ok_address(m, next))) {
+ if (!cinuse(next)) { /* consolidate forward */
+ if (next == m->top) {
+ size_t tsize = m->topsize += psize;
+ m->top = p;
+ p->head = tsize | PINUSE_BIT;
+ if (p == m->dv) {
+ m->dv = 0;
+ m->dvsize = 0;
+ }
+ return;
+ }
+ else if (next == m->dv) {
+ size_t dsize = m->dvsize += psize;
+ m->dv = p;
+ set_size_and_pinuse_of_free_chunk(p, dsize);
+ return;
+ }
+ else {
+ size_t nsize = chunksize(next);
+ psize += nsize;
+ unlink_chunk(m, next, nsize);
+ set_size_and_pinuse_of_free_chunk(p, psize);
+ if (p == m->dv) {
+ m->dvsize = psize;
+ return;
+ }
+ }
+ }
+ else {
+ set_free_with_pinuse(p, psize, next);
+ }
+ insert_chunk(m, p, psize);
+ }
+ else {
+ CORRUPTION_ERROR_ACTION(m);
+ }
+}
+
+/* ---------------------------- malloc --------------------------- */
+
+/* allocate a large request from the best fitting chunk in a treebin */
+static void* tmalloc_large(mstate m, size_t nb) {
+ tchunkptr v = 0;
+ size_t rsize = -nb; /* Unsigned negation */
+ tchunkptr t;
+ bindex_t idx;
+ compute_tree_index(nb, idx);
+ if ((t = *treebin_at(m, idx)) != 0) {
+ /* Traverse tree for this bin looking for node with size == nb */
+ size_t sizebits = nb << leftshift_for_tree_index(idx);
+ tchunkptr rst = 0; /* The deepest untaken right subtree */
+ for (;;) {
+ tchunkptr rt;
+ size_t trem = chunksize(t) - nb;
+ if (trem < rsize) {
+ v = t;
+ if ((rsize = trem) == 0)
+ break;
+ }
+ rt = t->child[1];
+ t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
+ if (rt != 0 && rt != t)
+ rst = rt;
+ if (t == 0) {
+ t = rst; /* set t to least subtree holding sizes > nb */
+ break;
+ }
+ sizebits <<= 1;
+ }
+ }
+ if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */
+ binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;
+ if (leftbits != 0) {
+ bindex_t i;
+ binmap_t leastbit = least_bit(leftbits);
+ compute_bit2idx(leastbit, i);
+ t = *treebin_at(m, i);
+ }
+ }
+
+ while (t != 0) { /* find smallest of tree or subtree */
+ size_t trem = chunksize(t) - nb;
+ if (trem < rsize) {
+ rsize = trem;
+ v = t;
+ }
+ t = leftmost_child(t);
+ }
+
+ /* If dv is a better fit, return 0 so malloc will use it */
+ if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {
+ if (RTCHECK(ok_address(m, v))) { /* split */
+ mchunkptr r = chunk_plus_offset(v, nb);
+ assert(chunksize(v) == rsize + nb);
+ if (RTCHECK(ok_next(v, r))) {
+ unlink_large_chunk(m, v);
+ if (rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(m, v, (rsize + nb));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(m, v, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ insert_chunk(m, r, rsize);
+ }
+ return chunk2mem(v);
+ }
+ }
+ CORRUPTION_ERROR_ACTION(m);
+ }
+ return 0;
+}
+
+/* allocate a small request from the best fitting chunk in a treebin */
+static void* tmalloc_small(mstate m, size_t nb) {
+ tchunkptr t, v;
+ size_t rsize;
+ bindex_t i;
+ binmap_t leastbit = least_bit(m->treemap);
+ compute_bit2idx(leastbit, i);
+ v = t = *treebin_at(m, i);
+ rsize = chunksize(t) - nb;
+
+ while ((t = leftmost_child(t)) != 0) {
+ size_t trem = chunksize(t) - nb;
+ if (trem < rsize) {
+ rsize = trem;
+ v = t;
+ }
+ }
+
+ if (RTCHECK(ok_address(m, v))) {
+ mchunkptr r = chunk_plus_offset(v, nb);
+ assert(chunksize(v) == rsize + nb);
+ if (RTCHECK(ok_next(v, r))) {
+ unlink_large_chunk(m, v);
+ if (rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(m, v, (rsize + nb));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(m, v, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ replace_dv(m, r, rsize);
+ }
+ return chunk2mem(v);
+ }
+ }
+
+ CORRUPTION_ERROR_ACTION(m);
+ return 0;
+}
+
+#if !ONLY_MSPACES
+
+void* dlmalloc(size_t bytes) {
+ /*
+ Basic algorithm:
+ If a small request (< 256 bytes minus per-chunk overhead):
+ 1. If one exists, use a remainderless chunk in associated smallbin.
+ (Remainderless means that there are too few excess bytes to
+ represent as a chunk.)
+ 2. If it is big enough, use the dv chunk, which is normally the
+ chunk adjacent to the one used for the most recent small request.
+ 3. If one exists, split the smallest available chunk in a bin,
+ saving remainder in dv.
+ 4. If it is big enough, use the top chunk.
+ 5. If available, get memory from system and use it
+ Otherwise, for a large request:
+ 1. Find the smallest available binned chunk that fits, and use it
+ if it is better fitting than dv chunk, splitting if necessary.
+ 2. If better fitting than any binned chunk, use the dv chunk.
+ 3. If it is big enough, use the top chunk.
+ 4. If request size >= mmap threshold, try to directly mmap this chunk.
+ 5. If available, get memory from system and use it
+
+ The ugly goto's here ensure that postaction occurs along all paths.
+ */
+
+#if USE_LOCKS
+ ensure_initialization(); /* initialize in sys_alloc if not using locks */
+#endif
+
+ if (!PREACTION(gm)) {
+ void* mem;
+ size_t nb;
+ if (bytes <= MAX_SMALL_REQUEST) {
+ bindex_t idx;
+ binmap_t smallbits;
+ nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
+ idx = small_index(nb);
+ smallbits = gm->smallmap >> idx;
+
+ if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
+ mchunkptr b, p;
+ idx += ~smallbits & 1; /* Uses next bin if idx empty */
+ b = smallbin_at(gm, idx);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(idx));
+ unlink_first_small_chunk(gm, b, p, idx);
+ set_inuse_and_pinuse(gm, p, small_index2size(idx));
+ mem = chunk2mem(p);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb > gm->dvsize) {
+ if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
+ mchunkptr b, p, r;
+ size_t rsize;
+ bindex_t i;
+ binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
+ binmap_t leastbit = least_bit(leftbits);
+ compute_bit2idx(leastbit, i);
+ b = smallbin_at(gm, i);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(i));
+ unlink_first_small_chunk(gm, b, p, i);
+ rsize = small_index2size(i) - nb;
+ /* Fit here cannot be remainderless if 4byte sizes */
+ if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(gm, p, small_index2size(i));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
+ r = chunk_plus_offset(p, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ replace_dv(gm, r, rsize);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+ }
+ }
+ else if (bytes >= MAX_REQUEST)
+ nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
+ else {
+ nb = pad_request(bytes);
+ if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+ }
+
+ if (nb <= gm->dvsize) {
+ size_t rsize = gm->dvsize - nb;
+ mchunkptr p = gm->dv;
+ if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
+ mchunkptr r = gm->dv = chunk_plus_offset(p, nb);
+ gm->dvsize = rsize;
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
+ }
+ else { /* exhaust dv */
+ size_t dvs = gm->dvsize;
+ gm->dvsize = 0;
+ gm->dv = 0;
+ set_inuse_and_pinuse(gm, p, dvs);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb < gm->topsize) { /* Split top */
+ size_t rsize = gm->topsize -= nb;
+ mchunkptr p = gm->top;
+ mchunkptr r = gm->top = chunk_plus_offset(p, nb);
+ r->head = rsize | PINUSE_BIT;
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
+ mem = chunk2mem(p);
+ check_top_chunk(gm, gm->top);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ mem = sys_alloc(gm, nb);
+
+ postaction:
+ POSTACTION(gm);
+ return mem;
+ }
+
+ return 0;
+}
+
+/* ---------------------------- free --------------------------- */
+
+void dlfree(void* mem) {
+ /*
+ Consolidate freed chunks with preceeding or succeeding bordering
+ free chunks, if they exist, and then place in a bin. Intermixed
+ with special cases for top, dv, mmapped chunks, and usage errors.
+ */
+
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+#if FOOTERS
+ mstate fm = get_mstate_for(p);
+ if (!ok_magic(fm)) {
+ USAGE_ERROR_ACTION(fm, p);
+ return;
+ }
+#else /* FOOTERS */
+#define fm gm
+#endif /* FOOTERS */
+ if (!PREACTION(fm)) {
+ check_inuse_chunk(fm, p);
+ if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
+ size_t psize = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, psize);
+ if (!pinuse(p)) {
+ size_t prevsize = p->prev_foot;
+ if (is_mmapped(p)) {
+ psize += prevsize + MMAP_FOOT_PAD;
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
+ fm->footprint -= psize;
+ goto postaction;
+ }
+ else {
+ mchunkptr prev = chunk_minus_offset(p, prevsize);
+ psize += prevsize;
+ p = prev;
+ if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
+ if (p != fm->dv) {
+ unlink_chunk(fm, p, prevsize);
+ }
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
+ fm->dvsize = psize;
+ set_free_with_pinuse(p, psize, next);
+ goto postaction;
+ }
+ }
+ else
+ goto erroraction;
+ }
+ }
+
+ if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
+ if (!cinuse(next)) { /* consolidate forward */
+ if (next == fm->top) {
+ size_t tsize = fm->topsize += psize;
+ fm->top = p;
+ p->head = tsize | PINUSE_BIT;
+ if (p == fm->dv) {
+ fm->dv = 0;
+ fm->dvsize = 0;
+ }
+ if (should_trim(fm, tsize))
+ sys_trim(fm, 0);
+ goto postaction;
+ }
+ else if (next == fm->dv) {
+ size_t dsize = fm->dvsize += psize;
+ fm->dv = p;
+ set_size_and_pinuse_of_free_chunk(p, dsize);
+ goto postaction;
+ }
+ else {
+ size_t nsize = chunksize(next);
+ psize += nsize;
+ unlink_chunk(fm, next, nsize);
+ set_size_and_pinuse_of_free_chunk(p, psize);
+ if (p == fm->dv) {
+ fm->dvsize = psize;
+ goto postaction;
+ }
+ }
+ }
+ else
+ set_free_with_pinuse(p, psize, next);
+
+ if (is_small(psize)) {
+ insert_small_chunk(fm, p, psize);
+ check_free_chunk(fm, p);
+ }
+ else {
+ tchunkptr tp = (tchunkptr)p;
+ insert_large_chunk(fm, tp, psize);
+ check_free_chunk(fm, p);
+ if (--fm->release_checks == 0)
+ release_unused_segments(fm);
+ }
+ goto postaction;
+ }
+ }
+ erroraction:
+ USAGE_ERROR_ACTION(fm, p);
+ postaction:
+ POSTACTION(fm);
+ }
+ }
+#if !FOOTERS
+#undef fm
+#endif /* FOOTERS */
+}
+
+void* dlcalloc(size_t n_elements, size_t elem_size) {
+ void* mem;
+ size_t req = 0;
+ if (n_elements != 0) {
+ req = n_elements * elem_size;
+ if (((n_elements | elem_size) & ~(size_t)0xffff) &&
+ (req / n_elements != elem_size))
+ req = MAX_SIZE_T; /* force downstream failure on overflow */
+ }
+ mem = dlmalloc(req);
+ if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
+ memset(mem, 0, req);
+ return mem;
+}
+
+#endif /* !ONLY_MSPACES */
+
+/* ------------ Internal support for realloc, memalign, etc -------------- */
+
+/* Try to realloc; only in-place unless can_move true */
+static mchunkptr try_realloc_chunk(mstate m, mchunkptr p, size_t nb,
+ int can_move) {
+ mchunkptr newp = 0;
+ size_t oldsize = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, oldsize);
+ if (RTCHECK(ok_address(m, p) && ok_inuse(p) &&
+ ok_next(p, next) && ok_pinuse(next))) {
+ if (is_mmapped(p)) {
+ newp = mmap_resize(m, p, nb, can_move);
+ }
+ else if (oldsize >= nb) { /* already big enough */
+ size_t rsize = oldsize - nb;
+ if (rsize >= MIN_CHUNK_SIZE) { /* split off remainder */
+ mchunkptr r = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ set_inuse(m, r, rsize);
+ dispose_chunk(m, r, rsize);
+ }
+ newp = p;
+ }
+ else if (next == m->top) { /* extend into top */
+ if (oldsize + m->topsize > nb) {
+ size_t newsize = oldsize + m->topsize;
+ size_t newtopsize = newsize - nb;
+ mchunkptr newtop = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ newtop->head = newtopsize |PINUSE_BIT;
+ m->top = newtop;
+ m->topsize = newtopsize;
+ newp = p;
+ }
+ }
+ else if (next == m->dv) { /* extend into dv */
+ size_t dvs = m->dvsize;
+ if (oldsize + dvs >= nb) {
+ size_t dsize = oldsize + dvs - nb;
+ if (dsize >= MIN_CHUNK_SIZE) {
+ mchunkptr r = chunk_plus_offset(p, nb);
+ mchunkptr n = chunk_plus_offset(r, dsize);
+ set_inuse(m, p, nb);
+ set_size_and_pinuse_of_free_chunk(r, dsize);
+ clear_pinuse(n);
+ m->dvsize = dsize;
+ m->dv = r;
+ }
+ else { /* exhaust dv */
+ size_t newsize = oldsize + dvs;
+ set_inuse(m, p, newsize);
+ m->dvsize = 0;
+ m->dv = 0;
+ }
+ newp = p;
+ }
+ }
+ else if (!cinuse(next)) { /* extend into next free chunk */
+ size_t nextsize = chunksize(next);
+ if (oldsize + nextsize >= nb) {
+ size_t rsize = oldsize + nextsize - nb;
+ unlink_chunk(m, next, nextsize);
+ if (rsize < MIN_CHUNK_SIZE) {
+ size_t newsize = oldsize + nextsize;
+ set_inuse(m, p, newsize);
+ }
+ else {
+ mchunkptr r = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ set_inuse(m, r, rsize);
+ dispose_chunk(m, r, rsize);
+ }
+ newp = p;
+ }
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(m, oldmem);
+ }
+ return newp;
+}
+
+static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {
+ void* mem = 0;
+ if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */
+ alignment = MIN_CHUNK_SIZE;
+ if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */
+ size_t a = MALLOC_ALIGNMENT << 1;
+ while (a < alignment) a <<= 1;
+ alignment = a;
+ }
+ if (bytes >= MAX_REQUEST - alignment) {
+ if (m != 0) { /* Test isn't needed but avoids compiler warning */
+ MALLOC_FAILURE_ACTION;
+ }
+ }
+ else {
+ size_t nb = request2size(bytes);
+ size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;
+ mem = internal_malloc(m, req);
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ if (PREACTION(m))
+ return 0;
+ if ((((size_t)(mem)) & (alignment - 1)) != 0) { /* misaligned */
+ /*
+ Find an aligned spot inside chunk. Since we need to give
+ back leading space in a chunk of at least MIN_CHUNK_SIZE, if
+ the first calculation places us at a spot with less than
+ MIN_CHUNK_SIZE leader, we can move to the next aligned spot.
+ We've allocated enough total room so that this is always
+ possible.
+ */
+ char* br = (char*)mem2chunk((size_t)(((size_t)((char*)mem + alignment -
+ SIZE_T_ONE)) &
+ -alignment));
+ char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?
+ br : br+alignment;
+ mchunkptr newp = (mchunkptr)pos;
+ size_t leadsize = pos - (char*)(p);
+ size_t newsize = chunksize(p) - leadsize;
+
+ if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */
+ newp->prev_foot = p->prev_foot + leadsize;
+ newp->head = newsize;
+ }
+ else { /* Otherwise, give back leader, use the rest */
+ set_inuse(m, newp, newsize);
+ set_inuse(m, p, leadsize);
+ dispose_chunk(m, p, leadsize);
+ }
+ p = newp;
+ }
+
+ /* Give back spare room at the end */
+ if (!is_mmapped(p)) {
+ size_t size = chunksize(p);
+ if (size > nb + MIN_CHUNK_SIZE) {
+ size_t remainder_size = size - nb;
+ mchunkptr remainder = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ set_inuse(m, remainder, remainder_size);
+ dispose_chunk(m, remainder, remainder_size);
+ }
+ }
+
+ mem = chunk2mem(p);
+ assert (chunksize(p) >= nb);
+ assert(((size_t)mem & (alignment - 1)) == 0);
+ check_inuse_chunk(m, p);
+ POSTACTION(m);
+ }
+ }
+ return mem;
+}
+
+/*
+ Common support for independent_X routines, handling
+ all of the combinations that can result.
+ The opts arg has:
+ bit 0 set if all elements are same size (using sizes[0])
+ bit 1 set if elements should be zeroed
+*/
+static void** ialloc(mstate m,
+ size_t n_elements,
+ size_t* sizes,
+ int opts,
+ void* chunks[]) {
+
+ size_t element_size; /* chunksize of each element, if all same */
+ size_t contents_size; /* total size of elements */
+ size_t array_size; /* request size of pointer array */
+ void* mem; /* malloced aggregate space */
+ mchunkptr p; /* corresponding chunk */
+ size_t remainder_size; /* remaining bytes while splitting */
+ void** marray; /* either "chunks" or malloced ptr array */
+ mchunkptr array_chunk; /* chunk for malloced ptr array */
+ flag_t was_enabled; /* to disable mmap */
+ size_t size;
+ size_t i;
+
+ ensure_initialization();
+ /* compute array length, if needed */
+ if (chunks != 0) {
+ if (n_elements == 0)
+ return chunks; /* nothing to do */
+ marray = chunks;
+ array_size = 0;
+ }
+ else {
+ /* if empty req, must still return chunk representing empty array */
+ if (n_elements == 0)
+ return (void**)internal_malloc(m, 0);
+ marray = 0;
+ array_size = request2size(n_elements * (sizeof(void*)));
+ }
+
+ /* compute total element size */
+ if (opts & 0x1) { /* all-same-size */
+ element_size = request2size(*sizes);
+ contents_size = n_elements * element_size;
+ }
+ else { /* add up all the sizes */
+ element_size = 0;
+ contents_size = 0;
+ for (i = 0; i != n_elements; ++i)
+ contents_size += request2size(sizes[i]);
+ }
+
+ size = contents_size + array_size;
+
+ /*
+ Allocate the aggregate chunk. First disable direct-mmapping so
+ malloc won't use it, since we would not be able to later
+ free/realloc space internal to a segregated mmap region.
+ */
+ was_enabled = use_mmap(m);
+ disable_mmap(m);
+ mem = internal_malloc(m, size - CHUNK_OVERHEAD);
+ if (was_enabled)
+ enable_mmap(m);
+ if (mem == 0)
+ return 0;
+
+ if (PREACTION(m)) return 0;
+ p = mem2chunk(mem);
+ remainder_size = chunksize(p);
+
+ assert(!is_mmapped(p));
+
+ if (opts & 0x2) { /* optionally clear the elements */
+ memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);
+ }
+
+ /* If not provided, allocate the pointer array as final part of chunk */
+ if (marray == 0) {
+ size_t array_chunk_size;
+ array_chunk = chunk_plus_offset(p, contents_size);
+ array_chunk_size = remainder_size - contents_size;
+ marray = (void**) (chunk2mem(array_chunk));
+ set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);
+ remainder_size = contents_size;
+ }
+
+ /* split out elements */
+ for (i = 0; ; ++i) {
+ marray[i] = chunk2mem(p);
+ if (i != n_elements-1) {
+ if (element_size != 0)
+ size = element_size;
+ else
+ size = request2size(sizes[i]);
+ remainder_size -= size;
+ set_size_and_pinuse_of_inuse_chunk(m, p, size);
+ p = chunk_plus_offset(p, size);
+ }
+ else { /* the final element absorbs any overallocation slop */
+ set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);
+ break;
+ }
+ }
+
+#if DEBUG
+ if (marray != chunks) {
+ /* final element must have exactly exhausted chunk */
+ if (element_size != 0) {
+ assert(remainder_size == element_size);
+ }
+ else {
+ assert(remainder_size == request2size(sizes[i]));
+ }
+ check_inuse_chunk(m, mem2chunk(marray));
+ }
+ for (i = 0; i != n_elements; ++i)
+ check_inuse_chunk(m, mem2chunk(marray[i]));
+
+#endif /* DEBUG */
+
+ POSTACTION(m);
+ return marray;
+}
+
+/* Try to free all pointers in the given array.
+ Note: this could be made faster, by delaying consolidation,
+ at the price of disabling some user integrity checks, We
+ still optimize some consolidations by combining adjacent
+ chunks before freeing, which will occur often if allocated
+ with ialloc or the array is sorted.
+*/
+static size_t internal_bulk_free(mstate m, void* array[], size_t nelem) {
+ size_t unfreed = 0;
+ if (!PREACTION(m)) {
+ void** a;
+ void** fence = &(array[nelem]);
+ for (a = array; a != fence; ++a) {
+ void* mem = *a;
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ size_t psize = chunksize(p);
+#if FOOTERS
+ if (get_mstate_for(p) != m) {
+ ++unfreed;
+ continue;
+ }
+#endif
+ check_inuse_chunk(m, p);
+ *a = 0;
+ if (RTCHECK(ok_address(m, p) && ok_inuse(p))) {
+ void ** b = a + 1; /* try to merge with next chunk */
+ mchunkptr next = next_chunk(p);
+ if (b != fence && *b == chunk2mem(next)) {
+ size_t newsize = chunksize(next) + psize;
+ set_inuse(m, p, newsize);
+ *b = chunk2mem(p);
+ }
+ else
+ dispose_chunk(m, p, psize);
+ }
+ else {
+ CORRUPTION_ERROR_ACTION(m);
+ break;
+ }
+ }
+ }
+ if (should_trim(m, m->topsize))
+ sys_trim(m, 0);
+ POSTACTION(m);
+ }
+ return unfreed;
+}
+
+/* Traversal */
+#if MALLOC_INSPECT_ALL
+static void internal_inspect_all(mstate m,
+ void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg) {
+ if (is_initialized(m)) {
+ mchunkptr top = m->top;
+ msegmentptr s;
+ for (s = &m->seg; s != 0; s = s->next) {
+ mchunkptr q = align_as_chunk(s->base);
+ while (segment_holds(s, q) && q->head != FENCEPOST_HEAD) {
+ mchunkptr next = next_chunk(q);
+ size_t sz = chunksize(q);
+ size_t used;
+ void* start;
+ if (is_inuse(q)) {
+ used = sz - CHUNK_OVERHEAD; /* must not be mmapped */
+ start = chunk2mem(q);
+ }
+ else {
+ used = 0;
+ if (is_small(sz)) { /* offset by possible bookkeeping */
+ // BEGIN android-changed
+ start = (void*)((char*)q + sizeof(struct malloc_chunk));
+ // END android-changed
+ }
+ else {
+ // BEGIN android-changed
+ start = (void*)((char*)q + sizeof(struct malloc_tree_chunk));
+ // END android-changed
+ }
+ }
+ if (start < (void*)next) /* skip if all space is bookkeeping */
+ handler(start, next, used, arg);
+ if (q == top)
+ break;
+ q = next;
+ }
+ }
+ }
+}
+#endif /* MALLOC_INSPECT_ALL */
+
+/* ------------------ Exported realloc, memalign, etc -------------------- */
+
+#if !ONLY_MSPACES
+
+void* dlrealloc(void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem == 0) {
+ mem = dlmalloc(bytes);
+ }
+ else if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+#ifdef REALLOC_ZERO_BYTES_FREES
+ else if (bytes == 0) {
+ dlfree(oldmem);
+ }
+#endif /* REALLOC_ZERO_BYTES_FREES */
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = gm;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 1);
+ POSTACTION(m);
+ if (newp != 0) {
+ check_inuse_chunk(m, newp);
+ mem = chunk2mem(newp);
+ }
+ else {
+ mem = internal_malloc(m, bytes);
+ if (mem != 0) {
+ size_t oc = chunksize(oldp) - overhead_for(oldp);
+ memcpy(mem, oldmem, (oc < bytes)? oc : bytes);
+ internal_free(m, oldmem);
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* dlrealloc_in_place(void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem != 0) {
+ if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = gm;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 0);
+ POSTACTION(m);
+ if (newp == oldp) {
+ check_inuse_chunk(m, newp);
+ mem = oldmem;
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* dlmemalign(size_t alignment, size_t bytes) {
+ if (alignment <= MALLOC_ALIGNMENT) {
+ return dlmalloc(bytes);
+ }
+ return internal_memalign(gm, alignment, bytes);
+}
+
+int dlposix_memalign(void** pp, size_t alignment, size_t bytes) {
+ void* mem = 0;
+ if (alignment == MALLOC_ALIGNMENT)
+ mem = dlmalloc(bytes);
+ else {
+ size_t d = alignment / sizeof(void*);
+ size_t r = alignment % sizeof(void*);
+ if (r != 0 || d == 0 || (d & (d-SIZE_T_ONE)) != 0)
+ return EINVAL;
+ else if (bytes >= MAX_REQUEST - alignment) {
+ if (alignment < MIN_CHUNK_SIZE)
+ alignment = MIN_CHUNK_SIZE;
+ mem = internal_memalign(gm, alignment, bytes);
+ }
+ }
+ if (mem == 0)
+ return ENOMEM;
+ else {
+ *pp = mem;
+ return 0;
+ }
+}
+
+void* dlvalloc(size_t bytes) {
+ size_t pagesz;
+ ensure_initialization();
+ pagesz = mparams.page_size;
+ return dlmemalign(pagesz, bytes);
+}
+
+void* dlpvalloc(size_t bytes) {
+ size_t pagesz;
+ ensure_initialization();
+ pagesz = mparams.page_size;
+ return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));
+}
+
+void** dlindependent_calloc(size_t n_elements, size_t elem_size,
+ void* chunks[]) {
+ size_t sz = elem_size; /* serves as 1-element array */
+ return ialloc(gm, n_elements, &sz, 3, chunks);
+}
+
+void** dlindependent_comalloc(size_t n_elements, size_t sizes[],
+ void* chunks[]) {
+ return ialloc(gm, n_elements, sizes, 0, chunks);
+}
+
+size_t dlbulk_free(void* array[], size_t nelem) {
+ return internal_bulk_free(gm, array, nelem);
+}
+
+#if MALLOC_INSPECT_ALL
+void dlmalloc_inspect_all(void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg) {
+ ensure_initialization();
+ if (!PREACTION(gm)) {
+ internal_inspect_all(gm, handler, arg);
+ POSTACTION(gm);
+ }
+}
+#endif /* MALLOC_INSPECT_ALL */
+
+int dlmalloc_trim(size_t pad) {
+ int result = 0;
+ ensure_initialization();
+ if (!PREACTION(gm)) {
+ result = sys_trim(gm, pad);
+ POSTACTION(gm);
+ }
+ return result;
+}
+
+size_t dlmalloc_footprint(void) {
+ return gm->footprint;
+}
+
+size_t dlmalloc_max_footprint(void) {
+ return gm->max_footprint;
+}
+
+size_t dlmalloc_footprint_limit(void) {
+ size_t maf = gm->footprint_limit;
+ return maf == 0 ? MAX_SIZE_T : maf;
+}
+
+size_t dlmalloc_set_footprint_limit(size_t bytes) {
+ size_t result; /* invert sense of 0 */
+ if (bytes == 0)
+ result = granularity_align(1); /* Use minimal size */
+ if (bytes == MAX_SIZE_T)
+ result = 0; /* disable */
+ else
+ result = granularity_align(bytes);
+ return gm->footprint_limit = result;
+}
+
+#if !NO_MALLINFO
+struct mallinfo dlmallinfo(void) {
+ return internal_mallinfo(gm);
+}
+#endif /* NO_MALLINFO */
+
+#if !NO_MALLOC_STATS
+void dlmalloc_stats() {
+ internal_malloc_stats(gm);
+}
+#endif /* NO_MALLOC_STATS */
+
+int dlmallopt(int param_number, int value) {
+ return change_mparam(param_number, value);
+}
+
+size_t dlmalloc_usable_size(void* mem) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ if (is_inuse(p))
+ return chunksize(p) - overhead_for(p);
+ }
+ return 0;
+}
+
+#endif /* !ONLY_MSPACES */
+
+/* ----------------------------- user mspaces ---------------------------- */
+
+#if MSPACES
+
+static mstate init_user_mstate(char* tbase, size_t tsize) {
+ size_t msize = pad_request(sizeof(struct malloc_state));
+ mchunkptr mn;
+ mchunkptr msp = align_as_chunk(tbase);
+ mstate m = (mstate)(chunk2mem(msp));
+ memset(m, 0, msize);
+ (void)INITIAL_LOCK(&m->mutex);
+ msp->head = (msize|INUSE_BITS);
+ m->seg.base = m->least_addr = tbase;
+ m->seg.size = m->footprint = m->max_footprint = tsize;
+ m->magic = mparams.magic;
+ m->release_checks = MAX_RELEASE_CHECK_RATE;
+ m->mflags = mparams.default_mflags;
+ m->extp = 0;
+ m->exts = 0;
+ disable_contiguous(m);
+ init_bins(m);
+ mn = next_chunk(mem2chunk(m));
+ init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);
+ check_top_chunk(m, m->top);
+ return m;
+}
+
+mspace create_mspace(size_t capacity, int locked) {
+ mstate m = 0;
+ size_t msize;
+ ensure_initialization();
+ msize = pad_request(sizeof(struct malloc_state));
+ if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
+ size_t rs = ((capacity == 0)? mparams.granularity :
+ (capacity + TOP_FOOT_SIZE + msize));
+ size_t tsize = granularity_align(rs);
+ char* tbase = (char*)(CALL_MMAP(tsize));
+ if (tbase != CMFAIL) {
+ m = init_user_mstate(tbase, tsize);
+ m->seg.sflags = USE_MMAP_BIT;
+ set_lock(m, locked);
+ }
+ }
+ return (mspace)m;
+}
+
+mspace create_mspace_with_base(void* base, size_t capacity, int locked) {
+ mstate m = 0;
+ size_t msize;
+ ensure_initialization();
+ msize = pad_request(sizeof(struct malloc_state));
+ if (capacity > msize + TOP_FOOT_SIZE &&
+ capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
+ m = init_user_mstate((char*)base, capacity);
+ m->seg.sflags = EXTERN_BIT;
+ set_lock(m, locked);
+ }
+ return (mspace)m;
+}
+
+int mspace_track_large_chunks(mspace msp, int enable) {
+ int ret = 0;
+ mstate ms = (mstate)msp;
+ if (!PREACTION(ms)) {
+ if (!use_mmap(ms))
+ ret = 1;
+ if (!enable)
+ enable_mmap(ms);
+ else
+ disable_mmap(ms);
+ POSTACTION(ms);
+ }
+ return ret;
+}
+
+size_t destroy_mspace(mspace msp) {
+ size_t freed = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ msegmentptr sp = &ms->seg;
+ (void)DESTROY_LOCK(&ms->mutex); /* destroy before unmapped */
+ while (sp != 0) {
+ char* base = sp->base;
+ size_t size = sp->size;
+ flag_t flag = sp->sflags;
+ sp = sp->next;
+ if ((flag & USE_MMAP_BIT) && !(flag & EXTERN_BIT) &&
+ CALL_MUNMAP(base, size) == 0)
+ freed += size;
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return freed;
+}
+
+/*
+ mspace versions of routines are near-clones of the global
+ versions. This is not so nice but better than the alternatives.
+*/
+
+void* mspace_malloc(mspace msp, size_t bytes) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ if (!PREACTION(ms)) {
+ void* mem;
+ size_t nb;
+ if (bytes <= MAX_SMALL_REQUEST) {
+ bindex_t idx;
+ binmap_t smallbits;
+ nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
+ idx = small_index(nb);
+ smallbits = ms->smallmap >> idx;
+
+ if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
+ mchunkptr b, p;
+ idx += ~smallbits & 1; /* Uses next bin if idx empty */
+ b = smallbin_at(ms, idx);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(idx));
+ unlink_first_small_chunk(ms, b, p, idx);
+ set_inuse_and_pinuse(ms, p, small_index2size(idx));
+ mem = chunk2mem(p);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb > ms->dvsize) {
+ if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
+ mchunkptr b, p, r;
+ size_t rsize;
+ bindex_t i;
+ binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
+ binmap_t leastbit = least_bit(leftbits);
+ compute_bit2idx(leastbit, i);
+ b = smallbin_at(ms, i);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(i));
+ unlink_first_small_chunk(ms, b, p, i);
+ rsize = small_index2size(i) - nb;
+ /* Fit here cannot be remainderless if 4byte sizes */
+ if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(ms, p, small_index2size(i));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
+ r = chunk_plus_offset(p, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ replace_dv(ms, r, rsize);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+ }
+ }
+ else if (bytes >= MAX_REQUEST)
+ nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
+ else {
+ nb = pad_request(bytes);
+ if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+ }
+
+ if (nb <= ms->dvsize) {
+ size_t rsize = ms->dvsize - nb;
+ mchunkptr p = ms->dv;
+ if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
+ mchunkptr r = ms->dv = chunk_plus_offset(p, nb);
+ ms->dvsize = rsize;
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
+ }
+ else { /* exhaust dv */
+ size_t dvs = ms->dvsize;
+ ms->dvsize = 0;
+ ms->dv = 0;
+ set_inuse_and_pinuse(ms, p, dvs);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb < ms->topsize) { /* Split top */
+ size_t rsize = ms->topsize -= nb;
+ mchunkptr p = ms->top;
+ mchunkptr r = ms->top = chunk_plus_offset(p, nb);
+ r->head = rsize | PINUSE_BIT;
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
+ mem = chunk2mem(p);
+ check_top_chunk(ms, ms->top);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ mem = sys_alloc(ms, nb);
+
+ postaction:
+ POSTACTION(ms);
+ return mem;
+ }
+
+ return 0;
+}
+
+void mspace_free(mspace msp, void* mem) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+#if FOOTERS
+ mstate fm = get_mstate_for(p);
+ msp = msp; /* placate people compiling -Wunused */
+#else /* FOOTERS */
+ mstate fm = (mstate)msp;
+#endif /* FOOTERS */
+ if (!ok_magic(fm)) {
+ USAGE_ERROR_ACTION(fm, p);
+ return;
+ }
+ if (!PREACTION(fm)) {
+ check_inuse_chunk(fm, p);
+ if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
+ size_t psize = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, psize);
+ if (!pinuse(p)) {
+ size_t prevsize = p->prev_foot;
+ if (is_mmapped(p)) {
+ psize += prevsize + MMAP_FOOT_PAD;
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
+ fm->footprint -= psize;
+ goto postaction;
+ }
+ else {
+ mchunkptr prev = chunk_minus_offset(p, prevsize);
+ psize += prevsize;
+ p = prev;
+ if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
+ if (p != fm->dv) {
+ unlink_chunk(fm, p, prevsize);
+ }
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
+ fm->dvsize = psize;
+ set_free_with_pinuse(p, psize, next);
+ goto postaction;
+ }
+ }
+ else
+ goto erroraction;
+ }
+ }
+
+ if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
+ if (!cinuse(next)) { /* consolidate forward */
+ if (next == fm->top) {
+ size_t tsize = fm->topsize += psize;
+ fm->top = p;
+ p->head = tsize | PINUSE_BIT;
+ if (p == fm->dv) {
+ fm->dv = 0;
+ fm->dvsize = 0;
+ }
+ if (should_trim(fm, tsize))
+ sys_trim(fm, 0);
+ goto postaction;
+ }
+ else if (next == fm->dv) {
+ size_t dsize = fm->dvsize += psize;
+ fm->dv = p;
+ set_size_and_pinuse_of_free_chunk(p, dsize);
+ goto postaction;
+ }
+ else {
+ size_t nsize = chunksize(next);
+ psize += nsize;
+ unlink_chunk(fm, next, nsize);
+ set_size_and_pinuse_of_free_chunk(p, psize);
+ if (p == fm->dv) {
+ fm->dvsize = psize;
+ goto postaction;
+ }
+ }
+ }
+ else
+ set_free_with_pinuse(p, psize, next);
+
+ if (is_small(psize)) {
+ insert_small_chunk(fm, p, psize);
+ check_free_chunk(fm, p);
+ }
+ else {
+ tchunkptr tp = (tchunkptr)p;
+ insert_large_chunk(fm, tp, psize);
+ check_free_chunk(fm, p);
+ if (--fm->release_checks == 0)
+ release_unused_segments(fm);
+ }
+ goto postaction;
+ }
+ }
+ erroraction:
+ USAGE_ERROR_ACTION(fm, p);
+ postaction:
+ POSTACTION(fm);
+ }
+ }
+}
+
+void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {
+ void* mem;
+ size_t req = 0;
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ if (n_elements != 0) {
+ req = n_elements * elem_size;
+ if (((n_elements | elem_size) & ~(size_t)0xffff) &&
+ (req / n_elements != elem_size))
+ req = MAX_SIZE_T; /* force downstream failure on overflow */
+ }
+ mem = internal_malloc(ms, req);
+ if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
+ memset(mem, 0, req);
+ return mem;
+}
+
+void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem == 0) {
+ mem = mspace_malloc(msp, bytes);
+ }
+ else if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+#ifdef REALLOC_ZERO_BYTES_FREES
+ else if (bytes == 0) {
+ mspace_free(msp, oldmem);
+ }
+#endif /* REALLOC_ZERO_BYTES_FREES */
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = (mstate)msp;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 1);
+ POSTACTION(m);
+ if (newp != 0) {
+ check_inuse_chunk(m, newp);
+ mem = chunk2mem(newp);
+ }
+ else {
+ mem = mspace_malloc(m, bytes);
+ if (mem != 0) {
+ size_t oc = chunksize(oldp) - overhead_for(oldp);
+ memcpy(mem, oldmem, (oc < bytes)? oc : bytes);
+ mspace_free(m, oldmem);
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* mspace_realloc_in_place(mspace msp, void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem != 0) {
+ if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = (mstate)msp;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ msp = msp; /* placate people compiling -Wunused */
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 0);
+ POSTACTION(m);
+ if (newp == oldp) {
+ check_inuse_chunk(m, newp);
+ mem = oldmem;
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ if (alignment <= MALLOC_ALIGNMENT)
+ return mspace_malloc(msp, bytes);
+ return internal_memalign(ms, alignment, bytes);
+}
+
+void** mspace_independent_calloc(mspace msp, size_t n_elements,
+ size_t elem_size, void* chunks[]) {
+ size_t sz = elem_size; /* serves as 1-element array */
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ return ialloc(ms, n_elements, &sz, 3, chunks);
+}
+
+void** mspace_independent_comalloc(mspace msp, size_t n_elements,
+ size_t sizes[], void* chunks[]) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ return ialloc(ms, n_elements, sizes, 0, chunks);
+}
+
+size_t mspace_bulk_free(mspace msp, void* array[], size_t nelem) {
+ return internal_bulk_free((mstate)msp, array, nelem);
+}
+
+#if MALLOC_INSPECT_ALL
+void mspace_inspect_all(mspace msp,
+ void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg) {
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ if (!PREACTION(ms)) {
+ internal_inspect_all(ms, handler, arg);
+ POSTACTION(ms);
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+}
+#endif /* MALLOC_INSPECT_ALL */
+
+int mspace_trim(mspace msp, size_t pad) {
+ int result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ if (!PREACTION(ms)) {
+ result = sys_trim(ms, pad);
+ POSTACTION(ms);
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+#if !NO_MALLOC_STATS
+void mspace_malloc_stats(mspace msp) {
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ internal_malloc_stats(ms);
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+}
+#endif /* NO_MALLOC_STATS */
+
+size_t mspace_footprint(mspace msp) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ result = ms->footprint;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+size_t mspace_max_footprint(mspace msp) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ result = ms->max_footprint;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+size_t mspace_footprint_limit(mspace msp) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ size_t maf = ms->footprint_limit;
+ result = (maf == 0) ? MAX_SIZE_T : maf;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+size_t mspace_set_footprint_limit(mspace msp, size_t bytes) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ if (bytes == 0)
+ result = granularity_align(1); /* Use minimal size */
+ if (bytes == MAX_SIZE_T)
+ result = 0; /* disable */
+ else
+ result = granularity_align(bytes);
+ ms->footprint_limit = result;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+#if !NO_MALLINFO
+struct mallinfo mspace_mallinfo(mspace msp) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return internal_mallinfo(ms);
+}
+#endif /* NO_MALLINFO */
+
+size_t mspace_usable_size(void* mem) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ if (is_inuse(p))
+ return chunksize(p) - overhead_for(p);
+ }
+ return 0;
+}
+
+int mspace_mallopt(int param_number, int value) {
+ return change_mparam(param_number, value);
+}
+
+#endif /* MSPACES */
+
+
+/* -------------------- Alternative MORECORE functions ------------------- */
+
+/*
+ Guidelines for creating a custom version of MORECORE:
+
+ * For best performance, MORECORE should allocate in multiples of pagesize.
+ * MORECORE may allocate more memory than requested. (Or even less,
+ but this will usually result in a malloc failure.)
+ * MORECORE must not allocate memory when given argument zero, but
+ instead return one past the end address of memory from previous
+ nonzero call.
+ * For best performance, consecutive calls to MORECORE with positive
+ arguments should return increasing addresses, indicating that
+ space has been contiguously extended.
+ * Even though consecutive calls to MORECORE need not return contiguous
+ addresses, it must be OK for malloc'ed chunks to span multiple
+ regions in those cases where they do happen to be contiguous.
+ * MORECORE need not handle negative arguments -- it may instead
+ just return MFAIL when given negative arguments.
+ Negative arguments are always multiples of pagesize. MORECORE
+ must not misinterpret negative args as large positive unsigned
+ args. You can suppress all such calls from even occurring by defining
+ MORECORE_CANNOT_TRIM,
+
+ As an example alternative MORECORE, here is a custom allocator
+ kindly contributed for pre-OSX macOS. It uses virtually but not
+ necessarily physically contiguous non-paged memory (locked in,
+ present and won't get swapped out). You can use it by uncommenting
+ this section, adding some #includes, and setting up the appropriate
+ defines above:
+
+ #define MORECORE osMoreCore
+
+ There is also a shutdown routine that should somehow be called for
+ cleanup upon program exit.
+
+ #define MAX_POOL_ENTRIES 100
+ #define MINIMUM_MORECORE_SIZE (64 * 1024U)
+ static int next_os_pool;
+ void *our_os_pools[MAX_POOL_ENTRIES];
+
+ void *osMoreCore(int size)
+ {
+ void *ptr = 0;
+ static void *sbrk_top = 0;
+
+ if (size > 0)
+ {
+ if (size < MINIMUM_MORECORE_SIZE)
+ size = MINIMUM_MORECORE_SIZE;
+ if (CurrentExecutionLevel() == kTaskLevel)
+ ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);
+ if (ptr == 0)
+ {
+ return (void *) MFAIL;
+ }
+ // save ptrs so they can be freed during cleanup
+ our_os_pools[next_os_pool] = ptr;
+ next_os_pool++;
+ ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);
+ sbrk_top = (char *) ptr + size;
+ return ptr;
+ }
+ else if (size < 0)
+ {
+ // we don't currently support shrink behavior
+ return (void *) MFAIL;
+ }
+ else
+ {
+ return sbrk_top;
+ }
+ }
+
+ // cleanup any allocated memory pools
+ // called as last thing before shutting down driver
+
+ void osCleanupMem(void)
+ {
+ void **ptr;
+
+ for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)
+ if (*ptr)
+ {
+ PoolDeallocate(*ptr);
+ *ptr = 0;
+ }
+ }
+
+*/
+
+
+/* -----------------------------------------------------------------------
+History:
+ v2.8.5 Sun May 22 10:26:02 2011 Doug Lea (dl at gee)
+ * Always perform unlink checks unless INSECURE
+ * Add posix_memalign.
+ * Improve realloc to expand in more cases; expose realloc_in_place.
+ Thanks to Peter Buhr for the suggestion.
+ * Add footprint_limit, inspect_all, bulk_free. Thanks
+ to Barry Hayes and others for the suggestions.
+ * Internal refactorings to avoid calls while holding locks
+ * Use non-reentrant locks by default. Thanks to Roland McGrath
+ for the suggestion.
+ * Small fixes to mspace_destroy, reset_on_error.
+ * Various configuration extensions/changes. Thanks
+ to all who contributed these.
+
+ V2.8.4a Thu Apr 28 14:39:43 2011 (dl at gee.cs.oswego.edu)
+ * Update Creative Commons URL
+
+ V2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)
+ * Use zeros instead of prev foot for is_mmapped
+ * Add mspace_track_large_chunks; thanks to Jean Brouwers
+ * Fix set_inuse in internal_realloc; thanks to Jean Brouwers
+ * Fix insufficient sys_alloc padding when using 16byte alignment
+ * Fix bad error check in mspace_footprint
+ * Adaptations for ptmalloc; thanks to Wolfram Gloger.
+ * Reentrant spin locks; thanks to Earl Chew and others
+ * Win32 improvements; thanks to Niall Douglas and Earl Chew
+ * Add NO_SEGMENT_TRAVERSAL and MAX_RELEASE_CHECK_RATE options
+ * Extension hook in malloc_state
+ * Various small adjustments to reduce warnings on some compilers
+ * Various configuration extensions/changes for more platforms. Thanks
+ to all who contributed these.
+
+ V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee)
+ * Add max_footprint functions
+ * Ensure all appropriate literals are size_t
+ * Fix conditional compilation problem for some #define settings
+ * Avoid concatenating segments with the one provided
+ in create_mspace_with_base
+ * Rename some variables to avoid compiler shadowing warnings
+ * Use explicit lock initialization.
+ * Better handling of sbrk interference.
+ * Simplify and fix segment insertion, trimming and mspace_destroy
+ * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x
+ * Thanks especially to Dennis Flanagan for help on these.
+
+ V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee)
+ * Fix memalign brace error.
+
+ V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee)
+ * Fix improper #endif nesting in C++
+ * Add explicit casts needed for C++
+
+ V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee)
+ * Use trees for large bins
+ * Support mspaces
+ * Use segments to unify sbrk-based and mmap-based system allocation,
+ removing need for emulation on most platforms without sbrk.
+ * Default safety checks
+ * Optional footer checks. Thanks to William Robertson for the idea.
+ * Internal code refactoring
+ * Incorporate suggestions and platform-specific changes.
+ Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,
+ Aaron Bachmann, Emery Berger, and others.
+ * Speed up non-fastbin processing enough to remove fastbins.
+ * Remove useless cfree() to avoid conflicts with other apps.
+ * Remove internal memcpy, memset. Compilers handle builtins better.
+ * Remove some options that no one ever used and rename others.
+
+ V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+ * Fix malloc_state bitmap array misdeclaration
+
+ V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee)
+ * Allow tuning of FIRST_SORTED_BIN_SIZE
+ * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.
+ * Better detection and support for non-contiguousness of MORECORE.
+ Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger
+ * Bypass most of malloc if no frees. Thanks To Emery Berger.
+ * Fix freeing of old top non-contiguous chunk im sysmalloc.
+ * Raised default trim and map thresholds to 256K.
+ * Fix mmap-related #defines. Thanks to Lubos Lunak.
+ * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.
+ * Branch-free bin calculation
+ * Default trim and mmap thresholds now 256K.
+
+ V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee)
+ * Introduce independent_comalloc and independent_calloc.
+ Thanks to Michael Pachos for motivation and help.
+ * Make optional .h file available
+ * Allow > 2GB requests on 32bit systems.
+ * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>.
+ Thanks also to Andreas Mueller <a.mueller at paradatec.de>,
+ and Anonymous.
+ * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for
+ helping test this.)
+ * memalign: check alignment arg
+ * realloc: don't try to shift chunks backwards, since this
+ leads to more fragmentation in some programs and doesn't
+ seem to help in any others.
+ * Collect all cases in malloc requiring system memory into sysmalloc
+ * Use mmap as backup to sbrk
+ * Place all internal state in malloc_state
+ * Introduce fastbins (although similar to 2.5.1)
+ * Many minor tunings and cosmetic improvements
+ * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK
+ * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS
+ Thanks to Tony E. Bennett <tbennett@nvidia.com> and others.
+ * Include errno.h to support default failure action.
+
+ V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee)
+ * return null for negative arguments
+ * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>
+ * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'
+ (e.g. WIN32 platforms)
+ * Cleanup header file inclusion for WIN32 platforms
+ * Cleanup code to avoid Microsoft Visual C++ compiler complaints
+ * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing
+ memory allocation routines
+ * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)
+ * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to
+ usage of 'assert' in non-WIN32 code
+ * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to
+ avoid infinite loop
+ * Always call 'fREe()' rather than 'free()'
+
+ V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee)
+ * Fixed ordering problem with boundary-stamping
+
+ V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee)
+ * Added pvalloc, as recommended by H.J. Liu
+ * Added 64bit pointer support mainly from Wolfram Gloger
+ * Added anonymously donated WIN32 sbrk emulation
+ * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen
+ * malloc_extend_top: fix mask error that caused wastage after
+ foreign sbrks
+ * Add linux mremap support code from HJ Liu
+
+ V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee)
+ * Integrated most documentation with the code.
+ * Add support for mmap, with help from
+ Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
+ * Use last_remainder in more cases.
+ * Pack bins using idea from colin@nyx10.cs.du.edu
+ * Use ordered bins instead of best-fit threshhold
+ * Eliminate block-local decls to simplify tracing and debugging.
+ * Support another case of realloc via move into top
+ * Fix error occuring when initial sbrk_base not word-aligned.
+ * Rely on page size for units instead of SBRK_UNIT to
+ avoid surprises about sbrk alignment conventions.
+ * Add mallinfo, mallopt. Thanks to Raymond Nijssen
+ (raymond@es.ele.tue.nl) for the suggestion.
+ * Add `pad' argument to malloc_trim and top_pad mallopt parameter.
+ * More precautions for cases where other routines call sbrk,
+ courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
+ * Added macros etc., allowing use in linux libc from
+ H.J. Lu (hjl@gnu.ai.mit.edu)
+ * Inverted this history list
+
+ V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee)
+ * Re-tuned and fixed to behave more nicely with V2.6.0 changes.
+ * Removed all preallocation code since under current scheme
+ the work required to undo bad preallocations exceeds
+ the work saved in good cases for most test programs.
+ * No longer use return list or unconsolidated bins since
+ no scheme using them consistently outperforms those that don't
+ given above changes.
+ * Use best fit for very large chunks to prevent some worst-cases.
+ * Added some support for debugging
+
+ V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee)
+ * Removed footers when chunks are in use. Thanks to
+ Paul Wilson (wilson@cs.texas.edu) for the suggestion.
+
+ V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee)
+ * Added malloc_trim, with help from Wolfram Gloger
+ (wmglo@Dent.MED.Uni-Muenchen.DE).
+
+ V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g)
+
+ V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g)
+ * realloc: try to expand in both directions
+ * malloc: swap order of clean-bin strategy;
+ * realloc: only conditionally expand backwards
+ * Try not to scavenge used bins
+ * Use bin counts as a guide to preallocation
+ * Occasionally bin return list chunks in first scan
+ * Add a few optimizations from colin@nyx10.cs.du.edu
+
+ V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g)
+ * faster bin computation & slightly different binning
+ * merged all consolidations to one part of malloc proper
+ (eliminating old malloc_find_space & malloc_clean_bin)
+ * Scan 2 returns chunks (not just 1)
+ * Propagate failure in realloc if malloc returns 0
+ * Add stuff to allow compilation on non-ANSI compilers
+ from kpv@research.att.com
+
+ V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu)
+ * removed potential for odd address access in prev_chunk
+ * removed dependency on getpagesize.h
+ * misc cosmetics and a bit more internal documentation
+ * anticosmetics: mangled names in macros to evade debugger strangeness
+ * tested on sparc, hp-700, dec-mips, rs6000
+ with gcc & native cc (hp, dec only) allowing
+ Detlefs & Zorn comparison study (in SIGPLAN Notices.)
+
+ Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu)
+ * Based loosely on libg++-1.2X malloc. (It retains some of the overall
+ structure of old version, but most details differ.)
+
+*/
+
diff --git a/src/dlmalloc/malloc.h b/src/dlmalloc/malloc.h
new file mode 100644
index 0000000..d51f1e0
--- /dev/null
+++ b/src/dlmalloc/malloc.h
@@ -0,0 +1,620 @@
+/*
+ Default header file for malloc-2.8.x, written by Doug Lea
+ and released to the public domain, as explained at
+ http://creativecommons.org/publicdomain/zero/1.0/
+
+ This header is for ANSI C/C++ only. You can set any of
+ the following #defines before including:
+
+ * If USE_DL_PREFIX is defined, it is assumed that malloc.c
+ was also compiled with this option, so all routines
+ have names starting with "dl".
+
+ * If HAVE_USR_INCLUDE_MALLOC_H is defined, it is assumed that this
+ file will be #included AFTER <malloc.h>. This is needed only if
+ your system defines a struct mallinfo that is incompatible with the
+ standard one declared here. Otherwise, you can include this file
+ INSTEAD of your system system <malloc.h>. At least on ANSI, all
+ declarations should be compatible with system versions
+
+ * If MSPACES is defined, declarations for mspace versions are included.
+*/
+
+#ifndef MALLOC_280_H
+#define MALLOC_280_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h> /* for size_t */
+
+#ifndef ONLY_MSPACES
+#define ONLY_MSPACES 0 /* define to a value */
+#elif ONLY_MSPACES != 0
+#define ONLY_MSPACES 1
+#endif /* ONLY_MSPACES */
+#ifndef NO_MALLINFO
+#define NO_MALLINFO 0
+#endif /* NO_MALLINFO */
+
+#ifndef MSPACES
+#if ONLY_MSPACES
+#define MSPACES 1
+#else /* ONLY_MSPACES */
+#define MSPACES 0
+#endif /* ONLY_MSPACES */
+#endif /* MSPACES */
+
+#if !ONLY_MSPACES
+
+#ifndef USE_DL_PREFIX
+#define dlcalloc calloc
+#define dlfree free
+#define dlmalloc malloc
+#define dlmemalign memalign
+#define dlposix_memalign posix_memalign
+#define dlrealloc realloc
+#define dlvalloc valloc
+#define dlpvalloc pvalloc
+#define dlmallinfo mallinfo
+#define dlmallopt mallopt
+#define dlmalloc_trim malloc_trim
+#define dlmalloc_stats malloc_stats
+#define dlmalloc_usable_size malloc_usable_size
+#define dlmalloc_footprint malloc_footprint
+#define dlmalloc_max_footprint malloc_max_footprint
+#define dlmalloc_footprint_limit malloc_footprint_limit
+#define dlmalloc_set_footprint_limit malloc_set_footprint_limit
+#define dlmalloc_inspect_all malloc_inspect_all
+#define dlindependent_calloc independent_calloc
+#define dlindependent_comalloc independent_comalloc
+#define dlbulk_free bulk_free
+#endif /* USE_DL_PREFIX */
+
+#if !NO_MALLINFO
+#ifndef HAVE_USR_INCLUDE_MALLOC_H
+#ifndef _MALLOC_H
+#ifndef MALLINFO_FIELD_TYPE
+#define MALLINFO_FIELD_TYPE size_t
+#endif /* MALLINFO_FIELD_TYPE */
+#ifndef STRUCT_MALLINFO_DECLARED
+#define STRUCT_MALLINFO_DECLARED 1
+struct mallinfo {
+ MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
+ MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
+ MALLINFO_FIELD_TYPE smblks; /* always 0 */
+ MALLINFO_FIELD_TYPE hblks; /* always 0 */
+ MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
+ MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
+ MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
+ MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
+ MALLINFO_FIELD_TYPE fordblks; /* total free space */
+ MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
+};
+#endif /* STRUCT_MALLINFO_DECLARED */
+#endif /* _MALLOC_H */
+#endif /* HAVE_USR_INCLUDE_MALLOC_H */
+#endif /* !NO_MALLINFO */
+
+/*
+ malloc(size_t n)
+ Returns a pointer to a newly allocated chunk of at least n bytes, or
+ null if no space is available, in which case errno is set to ENOMEM
+ on ANSI C systems.
+
+ If n is zero, malloc returns a minimum-sized chunk. (The minimum
+ size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
+ systems.) Note that size_t is an unsigned type, so calls with
+ arguments that would be negative if signed are interpreted as
+ requests for huge amounts of space, which will often fail. The
+ maximum supported value of n differs across systems, but is in all
+ cases less than the maximum representable value of a size_t.
+*/
+void* dlmalloc(size_t);
+
+/*
+ free(void* p)
+ Releases the chunk of memory pointed to by p, that had been previously
+ allocated using malloc or a related routine such as realloc.
+ It has no effect if p is null. If p was not malloced or already
+ freed, free(p) will by default cuase the current program to abort.
+*/
+void dlfree(void*);
+
+/*
+ calloc(size_t n_elements, size_t element_size);
+ Returns a pointer to n_elements * element_size bytes, with all locations
+ set to zero.
+*/
+void* dlcalloc(size_t, size_t);
+
+/*
+ realloc(void* p, size_t n)
+ Returns a pointer to a chunk of size n that contains the same data
+ as does chunk p up to the minimum of (n, p's size) bytes, or null
+ if no space is available.
+
+ The returned pointer may or may not be the same as p. The algorithm
+ prefers extending p in most cases when possible, otherwise it
+ employs the equivalent of a malloc-copy-free sequence.
+
+ If p is null, realloc is equivalent to malloc.
+
+ If space is not available, realloc returns null, errno is set (if on
+ ANSI) and p is NOT freed.
+
+ if n is for fewer bytes than already held by p, the newly unused
+ space is lopped off and freed if possible. realloc with a size
+ argument of zero (re)allocates a minimum-sized chunk.
+
+ The old unix realloc convention of allowing the last-free'd chunk
+ to be used as an argument to realloc is not supported.
+*/
+void* dlrealloc(void*, size_t);
+
+/*
+ realloc_in_place(void* p, size_t n)
+ Resizes the space allocated for p to size n, only if this can be
+ done without moving p (i.e., only if there is adjacent space
+ available if n is greater than p's current allocated size, or n is
+ less than or equal to p's size). This may be used instead of plain
+ realloc if an alternative allocation strategy is needed upon failure
+ to expand space; for example, reallocation of a buffer that must be
+ memory-aligned or cleared. You can use realloc_in_place to trigger
+ these alternatives only when needed.
+
+ Returns p if successful; otherwise null.
+*/
+void* dlrealloc_in_place(void*, size_t);
+
+/*
+ memalign(size_t alignment, size_t n);
+ Returns a pointer to a newly allocated chunk of n bytes, aligned
+ in accord with the alignment argument.
+
+ The alignment argument should be a power of two. If the argument is
+ not a power of two, the nearest greater power is used.
+ 8-byte alignment is guaranteed by normal malloc calls, so don't
+ bother calling memalign with an argument of 8 or less.
+
+ Overreliance on memalign is a sure way to fragment space.
+*/
+void* dlmemalign(size_t, size_t);
+
+/*
+ int posix_memalign(void** pp, size_t alignment, size_t n);
+ Allocates a chunk of n bytes, aligned in accord with the alignment
+ argument. Differs from memalign only in that it (1) assigns the
+ allocated memory to *pp rather than returning it, (2) fails and
+ returns EINVAL if the alignment is not a power of two (3) fails and
+ returns ENOMEM if memory cannot be allocated.
+*/
+int dlposix_memalign(void**, size_t, size_t);
+
+/*
+ valloc(size_t n);
+ Equivalent to memalign(pagesize, n), where pagesize is the page
+ size of the system. If the pagesize is unknown, 4096 is used.
+*/
+void* dlvalloc(size_t);
+
+/*
+ mallopt(int parameter_number, int parameter_value)
+ Sets tunable parameters The format is to provide a
+ (parameter-number, parameter-value) pair. mallopt then sets the
+ corresponding parameter to the argument value if it can (i.e., so
+ long as the value is meaningful), and returns 1 if successful else
+ 0. SVID/XPG/ANSI defines four standard param numbers for mallopt,
+ normally defined in malloc.h. None of these are use in this malloc,
+ so setting them has no effect. But this malloc also supports other
+ options in mallopt:
+
+ Symbol param # default allowed param values
+ M_TRIM_THRESHOLD -1 2*1024*1024 any (-1U disables trimming)
+ M_GRANULARITY -2 page size any power of 2 >= page size
+ M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
+*/
+int dlmallopt(int, int);
+
+#define M_TRIM_THRESHOLD (-1)
+#define M_GRANULARITY (-2)
+#define M_MMAP_THRESHOLD (-3)
+
+
+/*
+ malloc_footprint();
+ Returns the number of bytes obtained from the system. The total
+ number of bytes allocated by malloc, realloc etc., is less than this
+ value. Unlike mallinfo, this function returns only a precomputed
+ result, so can be called frequently to monitor memory consumption.
+ Even if locks are otherwise defined, this function does not use them,
+ so results might not be up to date.
+*/
+size_t dlmalloc_footprint(void);
+
+/*
+ malloc_max_footprint();
+ Returns the maximum number of bytes obtained from the system. This
+ value will be greater than current footprint if deallocated space
+ has been reclaimed by the system. The peak number of bytes allocated
+ by malloc, realloc etc., is less than this value. Unlike mallinfo,
+ this function returns only a precomputed result, so can be called
+ frequently to monitor memory consumption. Even if locks are
+ otherwise defined, this function does not use them, so results might
+ not be up to date.
+*/
+size_t dlmalloc_max_footprint(void);
+
+/*
+ malloc_footprint_limit();
+ Returns the number of bytes that the heap is allowed to obtain from
+ the system, returning the last value returned by
+ malloc_set_footprint_limit, or the maximum size_t value if
+ never set. The returned value reflects a permission. There is no
+ guarantee that this number of bytes can actually be obtained from
+ the system.
+*/
+size_t dlmalloc_footprint_limit(void);
+
+/*
+ malloc_set_footprint_limit();
+ Sets the maximum number of bytes to obtain from the system, causing
+ failure returns from malloc and related functions upon attempts to
+ exceed this value. The argument value may be subject to page
+ rounding to an enforceable limit; this actual value is returned.
+ Using an argument of the maximum possible size_t effectively
+ disables checks. If the argument is less than or equal to the
+ current malloc_footprint, then all future allocations that require
+ additional system memory will fail. However, invocation cannot
+ retroactively deallocate existing used memory.
+*/
+size_t dlmalloc_set_footprint_limit(size_t bytes);
+
+/*
+ malloc_inspect_all(void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg);
+ Traverses the heap and calls the given handler for each managed
+ region, skipping all bytes that are (or may be) used for bookkeeping
+ purposes. Traversal does not include include chunks that have been
+ directly memory mapped. Each reported region begins at the start
+ address, and continues up to but not including the end address. The
+ first used_bytes of the region contain allocated data. If
+ used_bytes is zero, the region is unallocated. The handler is
+ invoked with the given callback argument. If locks are defined, they
+ are held during the entire traversal. It is a bad idea to invoke
+ other malloc functions from within the handler.
+
+ For example, to count the number of in-use chunks with size greater
+ than 1000, you could write:
+ static int count = 0;
+ void count_chunks(void* start, void* end, size_t used, void* arg) {
+ if (used >= 1000) ++count;
+ }
+ then:
+ malloc_inspect_all(count_chunks, NULL);
+
+ malloc_inspect_all is compiled only if MALLOC_INSPECT_ALL is defined.
+*/
+void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*),
+ void* arg);
+
+#if !NO_MALLINFO
+/*
+ mallinfo()
+ Returns (by copy) a struct containing various summary statistics:
+
+ arena: current total non-mmapped bytes allocated from system
+ ordblks: the number of free chunks
+ smblks: always zero.
+ hblks: current number of mmapped regions
+ hblkhd: total bytes held in mmapped regions
+ usmblks: the maximum total allocated space. This will be greater
+ than current total if trimming has occurred.
+ fsmblks: always zero
+ uordblks: current total allocated space (normal or mmapped)
+ fordblks: total free space
+ keepcost: the maximum number of bytes that could ideally be released
+ back to system via malloc_trim. ("ideally" means that
+ it ignores page restrictions etc.)
+
+ Because these fields are ints, but internal bookkeeping may
+ be kept as longs, the reported values may wrap around zero and
+ thus be inaccurate.
+*/
+
+struct mallinfo dlmallinfo(void);
+#endif /* NO_MALLINFO */
+
+/*
+ independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
+
+ independent_calloc is similar to calloc, but instead of returning a
+ single cleared space, it returns an array of pointers to n_elements
+ independent elements that can hold contents of size elem_size, each
+ of which starts out cleared, and can be independently freed,
+ realloc'ed etc. The elements are guaranteed to be adjacently
+ allocated (this is not guaranteed to occur with multiple callocs or
+ mallocs), which may also improve cache locality in some
+ applications.
+
+ The "chunks" argument is optional (i.e., may be null, which is
+ probably the most typical usage). If it is null, the returned array
+ is itself dynamically allocated and should also be freed when it is
+ no longer needed. Otherwise, the chunks array must be of at least
+ n_elements in length. It is filled in with the pointers to the
+ chunks.
+
+ In either case, independent_calloc returns this pointer array, or
+ null if the allocation failed. If n_elements is zero and "chunks"
+ is null, it returns a chunk representing an array with zero elements
+ (which should be freed if not wanted).
+
+ Each element must be freed when it is no longer needed. This can be
+ done all at once using bulk_free.
+
+ independent_calloc simplifies and speeds up implementations of many
+ kinds of pools. It may also be useful when constructing large data
+ structures that initially have a fixed number of fixed-sized nodes,
+ but the number is not known at compile time, and some of the nodes
+ may later need to be freed. For example:
+
+ struct Node { int item; struct Node* next; };
+
+ struct Node* build_list() {
+ struct Node** pool;
+ int n = read_number_of_nodes_needed();
+ if (n <= 0) return 0;
+ pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
+ if (pool == 0) die();
+ // organize into a linked list...
+ struct Node* first = pool[0];
+ for (i = 0; i < n-1; ++i)
+ pool[i]->next = pool[i+1];
+ free(pool); // Can now free the array (or not, if it is needed later)
+ return first;
+ }
+*/
+void** dlindependent_calloc(size_t, size_t, void**);
+
+/*
+ independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
+
+ independent_comalloc allocates, all at once, a set of n_elements
+ chunks with sizes indicated in the "sizes" array. It returns
+ an array of pointers to these elements, each of which can be
+ independently freed, realloc'ed etc. The elements are guaranteed to
+ be adjacently allocated (this is not guaranteed to occur with
+ multiple callocs or mallocs), which may also improve cache locality
+ in some applications.
+
+ The "chunks" argument is optional (i.e., may be null). If it is null
+ the returned array is itself dynamically allocated and should also
+ be freed when it is no longer needed. Otherwise, the chunks array
+ must be of at least n_elements in length. It is filled in with the
+ pointers to the chunks.
+
+ In either case, independent_comalloc returns this pointer array, or
+ null if the allocation failed. If n_elements is zero and chunks is
+ null, it returns a chunk representing an array with zero elements
+ (which should be freed if not wanted).
+
+ Each element must be freed when it is no longer needed. This can be
+ done all at once using bulk_free.
+
+ independent_comallac differs from independent_calloc in that each
+ element may have a different size, and also that it does not
+ automatically clear elements.
+
+ independent_comalloc can be used to speed up allocation in cases
+ where several structs or objects must always be allocated at the
+ same time. For example:
+
+ struct Head { ... }
+ struct Foot { ... }
+
+ void send_message(char* msg) {
+ int msglen = strlen(msg);
+ size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
+ void* chunks[3];
+ if (independent_comalloc(3, sizes, chunks) == 0)
+ die();
+ struct Head* head = (struct Head*)(chunks[0]);
+ char* body = (char*)(chunks[1]);
+ struct Foot* foot = (struct Foot*)(chunks[2]);
+ // ...
+ }
+
+ In general though, independent_comalloc is worth using only for
+ larger values of n_elements. For small values, you probably won't
+ detect enough difference from series of malloc calls to bother.
+
+ Overuse of independent_comalloc can increase overall memory usage,
+ since it cannot reuse existing noncontiguous small chunks that
+ might be available for some of the elements.
+*/
+void** dlindependent_comalloc(size_t, size_t*, void**);
+
+/*
+ bulk_free(void* array[], size_t n_elements)
+ Frees and clears (sets to null) each non-null pointer in the given
+ array. This is likely to be faster than freeing them one-by-one.
+ If footers are used, pointers that have been allocated in different
+ mspaces are not freed or cleared, and the count of all such pointers
+ is returned. For large arrays of pointers with poor locality, it
+ may be worthwhile to sort this array before calling bulk_free.
+*/
+size_t dlbulk_free(void**, size_t n_elements);
+
+/*
+ pvalloc(size_t n);
+ Equivalent to valloc(minimum-page-that-holds(n)), that is,
+ round up n to nearest pagesize.
+ */
+void* dlpvalloc(size_t);
+
+/*
+ malloc_trim(size_t pad);
+
+ If possible, gives memory back to the system (via negative arguments
+ to sbrk) if there is unused memory at the `high' end of the malloc
+ pool or in unused MMAP segments. You can call this after freeing
+ large blocks of memory to potentially reduce the system-level memory
+ requirements of a program. However, it cannot guarantee to reduce
+ memory. Under some allocation patterns, some large free blocks of
+ memory will be locked between two used chunks, so they cannot be
+ given back to the system.
+
+ The `pad' argument to malloc_trim represents the amount of free
+ trailing space to leave untrimmed. If this argument is zero, only
+ the minimum amount of memory to maintain internal data structures
+ will be left. Non-zero arguments can be supplied to maintain enough
+ trailing space to service future expected allocations without having
+ to re-obtain memory from the system.
+
+ Malloc_trim returns 1 if it actually released any memory, else 0.
+*/
+int dlmalloc_trim(size_t);
+
+/*
+ malloc_stats();
+ Prints on stderr the amount of space obtained from the system (both
+ via sbrk and mmap), the maximum amount (which may be more than
+ current if malloc_trim and/or munmap got called), and the current
+ number of bytes allocated via malloc (or realloc, etc) but not yet
+ freed. Note that this is the number of bytes allocated, not the
+ number requested. It will be larger than the number requested
+ because of alignment and bookkeeping overhead. Because it includes
+ alignment wastage as being in use, this figure may be greater than
+ zero even when no user-level chunks are allocated.
+
+ The reported current and maximum system memory can be inaccurate if
+ a program makes other calls to system memory allocation functions
+ (normally sbrk) outside of malloc.
+
+ malloc_stats prints only the most commonly interesting statistics.
+ More information can be obtained by calling mallinfo.
+
+ malloc_stats is not compiled if NO_MALLOC_STATS is defined.
+*/
+void dlmalloc_stats(void);
+
+#endif /* !ONLY_MSPACES */
+
+/*
+ malloc_usable_size(void* p);
+
+ Returns the number of bytes you can actually use in
+ an allocated chunk, which may be more than you requested (although
+ often not) due to alignment and minimum size constraints.
+ You can use this many bytes without worrying about
+ overwriting other allocated objects. This is not a particularly great
+ programming practice. malloc_usable_size can be more useful in
+ debugging and assertions, for example:
+
+ p = malloc(n);
+ assert(malloc_usable_size(p) >= 256);
+*/
+size_t dlmalloc_usable_size(void*);
+
+#if MSPACES
+
+/*
+ mspace is an opaque type representing an independent
+ region of space that supports mspace_malloc, etc.
+*/
+typedef void* mspace;
+
+/*
+ create_mspace creates and returns a new independent space with the
+ given initial capacity, or, if 0, the default granularity size. It
+ returns null if there is no system memory available to create the
+ space. If argument locked is non-zero, the space uses a separate
+ lock to control access. The capacity of the space will grow
+ dynamically as needed to service mspace_malloc requests. You can
+ control the sizes of incremental increases of this space by
+ compiling with a different DEFAULT_GRANULARITY or dynamically
+ setting with mallopt(M_GRANULARITY, value).
+*/
+mspace create_mspace(size_t capacity, int locked);
+
+/*
+ destroy_mspace destroys the given space, and attempts to return all
+ of its memory back to the system, returning the total number of
+ bytes freed. After destruction, the results of access to all memory
+ used by the space become undefined.
+*/
+size_t destroy_mspace(mspace msp);
+
+/*
+ create_mspace_with_base uses the memory supplied as the initial base
+ of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
+ space is used for bookkeeping, so the capacity must be at least this
+ large. (Otherwise 0 is returned.) When this initial space is
+ exhausted, additional memory will be obtained from the system.
+ Destroying this space will deallocate all additionally allocated
+ space (if possible) but not the initial base.
+*/
+mspace create_mspace_with_base(void* base, size_t capacity, int locked);
+
+/*
+ mspace_track_large_chunks controls whether requests for large chunks
+ are allocated in their own untracked mmapped regions, separate from
+ others in this mspace. By default large chunks are not tracked,
+ which reduces fragmentation. However, such chunks are not
+ necessarily released to the system upon destroy_mspace. Enabling
+ tracking by setting to true may increase fragmentation, but avoids
+ leakage when relying on destroy_mspace to release all memory
+ allocated using this space. The function returns the previous
+ setting.
+*/
+int mspace_track_large_chunks(mspace msp, int enable);
+
+#if !NO_MALLINFO
+/*
+ mspace_mallinfo behaves as mallinfo, but reports properties of
+ the given space.
+*/
+struct mallinfo mspace_mallinfo(mspace msp);
+#endif /* NO_MALLINFO */
+
+/*
+ An alias for mallopt.
+*/
+int mspace_mallopt(int, int);
+
+/*
+ The following operate identically to their malloc counterparts
+ but operate only for the given mspace argument
+*/
+void* mspace_malloc(mspace msp, size_t bytes);
+void mspace_free(mspace msp, void* mem);
+void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
+void* mspace_realloc(mspace msp, void* mem, size_t newsize);
+void* mspace_realloc_in_place(mspace msp, void* mem, size_t newsize);
+void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
+void** mspace_independent_calloc(mspace msp, size_t n_elements,
+ size_t elem_size, void* chunks[]);
+void** mspace_independent_comalloc(mspace msp, size_t n_elements,
+ size_t sizes[], void* chunks[]);
+size_t mspace_bulk_free(mspace msp, void**, size_t n_elements);
+size_t mspace_usable_size(void* mem);
+void mspace_malloc_stats(mspace msp);
+int mspace_trim(mspace msp, size_t pad);
+size_t mspace_footprint(mspace msp);
+size_t mspace_max_footprint(mspace msp);
+size_t mspace_footprint_limit(mspace msp);
+size_t mspace_set_footprint_limit(mspace msp, size_t bytes);
+void mspace_inspect_all(mspace msp,
+ void(*handler)(void *, void *, size_t, void*),
+ void* arg);
+#endif /* MSPACES */
+
+#ifdef __cplusplus
+}; /* end of extern "C" */
+#endif
+
+#endif /* MALLOC_280_H */
diff --git a/src/heap.cc b/src/heap.cc
index 7e44116..858b9b2 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -21,11 +21,7 @@
std::vector<Space*> Heap::spaces_;
-Space* Heap::alloc_space_ = NULL;
-
-size_t Heap::maximum_size_ = 0;
-
-size_t Heap::growth_size_ = 0;
+AllocSpace* Heap::alloc_space_ = NULL;
size_t Heap::num_bytes_allocated_ = 0;
@@ -56,71 +52,87 @@
bool Heap::verify_objects_ = false;
-void Heap::Init(size_t initial_size, size_t maximum_size, size_t growth_size,
+static void UpdateFirstAndLastSpace(Space** first_space, Space** last_space, Space* space) {
+ if (*first_space == NULL) {
+ *first_space = space;
+ *last_space = space;
+ } else {
+ if ((*first_space)->Begin() > space->Begin()) {
+ *first_space = space;
+ } else if (space->Begin() > (*last_space)->Begin()) {
+ *last_space = space;
+ }
+ }
+}
+
+void Heap::Init(size_t initial_size, size_t growth_limit, size_t capacity,
const std::vector<std::string>& image_file_names) {
if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
LOG(INFO) << "Heap::Init entering";
}
- // bounds of all spaces for allocating live and mark bitmaps
- // there will be at least one space (the alloc space),
- // so set base to max, and limit and min to start
- byte* base = reinterpret_cast<byte*>(std::numeric_limits<uintptr_t>::max());
- byte* max = reinterpret_cast<byte*>(std::numeric_limits<uintptr_t>::min());
- byte* limit = reinterpret_cast<byte*>(std::numeric_limits<uintptr_t>::min());
+ // Compute the bounds of all spaces for allocating live and mark bitmaps
+ // there will be at least one space (the alloc space)
+ Space* first_space = NULL;
+ Space* last_space = NULL;
- byte* requested_base = NULL;
+ // Requested begin for the alloc space, to follow the mapped image and oat files
+ byte* requested_begin = NULL;
std::vector<Space*> image_spaces;
for (size_t i = 0; i < image_file_names.size(); i++) {
- Space* space = Space::CreateFromImage(image_file_names[i]);
+ ImageSpace* space = Space::CreateImageSpace(image_file_names[i]);
if (space == NULL) {
LOG(FATAL) << "Failed to create space from " << image_file_names[i];
}
image_spaces.push_back(space);
- spaces_.push_back(space);
- byte* oat_limit_addr = space->GetImageHeader().GetOatLimitAddr();
- if (oat_limit_addr > requested_base) {
- requested_base = reinterpret_cast<byte*>(RoundUp(reinterpret_cast<uintptr_t>(oat_limit_addr),
- kPageSize));
+ AddSpace(space);
+ UpdateFirstAndLastSpace(&first_space, &last_space, space);
+ // Oat files referenced by image files immediately follow them in memory, ensure alloc space
+ // isn't going to get in the middle
+ byte* oat_end_addr = space->GetImageHeader().GetOatEnd();
+ CHECK(oat_end_addr > space->End());
+ if (oat_end_addr > requested_begin) {
+ requested_begin = reinterpret_cast<byte*>(RoundUp(reinterpret_cast<uintptr_t>(oat_end_addr),
+ kPageSize));
}
- base = std::min(base, space->GetBase());
- max = std::max(max, space->GetMax());
- limit = std::max(limit, space->GetLimit());
}
- alloc_space_ = Space::Create("alloc space", initial_size, maximum_size, growth_size, requested_base);
+ alloc_space_ = Space::CreateAllocSpace("alloc space", initial_size, growth_limit, capacity,
+ requested_begin);
if (alloc_space_ == NULL) {
LOG(FATAL) << "Failed to create alloc space";
}
- base = std::min(base, alloc_space_->GetBase());
- max = std::max(max, alloc_space_->GetMax());
- limit = std::max(limit, alloc_space_->GetLimit());
- DCHECK_LT(base, max);
- DCHECK_LT(base, limit);
- size_t num_bytes = max - base;
- size_t limit_bytes = limit - base;
+ AddSpace(alloc_space_);
+ UpdateFirstAndLastSpace(&first_space, &last_space, alloc_space_);
+ byte* heap_begin = first_space->Begin();
+ size_t heap_capacity = (last_space->Begin() - first_space->Begin()) + last_space->UnimpededCapacity();
// Allocate the initial live bitmap.
- UniquePtr<HeapBitmap> live_bitmap(HeapBitmap::Create("dalvik-bitmap-1", base, num_bytes));
+ UniquePtr<HeapBitmap> live_bitmap(HeapBitmap::Create("dalvik-bitmap-1", heap_begin, heap_capacity));
if (live_bitmap.get() == NULL) {
LOG(FATAL) << "Failed to create live bitmap";
}
+ // Mark image objects in the live bitmap
+ for (size_t i = 0; i < spaces_.size(); i++) {
+ Space* space = spaces_[i];
+ if (space->IsImageSpace()) {
+ space->AsImageSpace()->RecordImageAllocations(live_bitmap.get());
+ }
+ }
+
// Allocate the initial mark bitmap.
- UniquePtr<HeapBitmap> mark_bitmap(HeapBitmap::Create("dalvik-bitmap-2", base, num_bytes));
+ UniquePtr<HeapBitmap> mark_bitmap(HeapBitmap::Create("dalvik-bitmap-2", heap_begin, heap_capacity));
if (mark_bitmap.get() == NULL) {
LOG(FATAL) << "Failed to create mark bitmap";
}
// Allocate the card table.
- UniquePtr<CardTable> card_table(CardTable::Create(base, num_bytes, limit_bytes));
+ UniquePtr<CardTable> card_table(CardTable::Create(heap_begin, heap_capacity));
if (card_table.get() == NULL) {
LOG(FATAL) << "Failed to create card table";
}
- spaces_.push_back(alloc_space_);
- maximum_size_ = maximum_size;
- growth_size_ = growth_size;
live_bitmap_ = live_bitmap.release();
mark_bitmap_ = mark_bitmap.release();
card_table_ = card_table.release();
@@ -128,18 +140,13 @@
num_bytes_allocated_ = 0;
num_objects_allocated_ = 0;
- // Make image objects live (after live_bitmap_ is set)
- for (size_t i = 0; i < image_spaces.size(); i++) {
- RecordImageAllocations(image_spaces[i]);
- }
-
- Heap::EnableObjectValidation();
-
// It's still to early to take a lock because there are no threads yet,
// but we can create the heap lock now. We don't create it earlier to
// make it clear that you can't use locks during heap initialization.
lock_ = new Mutex("Heap lock");
+ Heap::EnableObjectValidation();
+
if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
LOG(INFO) << "Heap::Init exiting";
}
@@ -184,8 +191,12 @@
if (obj == NULL || !IsAligned<kObjectAlignment>(obj)) {
return false;
}
- // TODO
- return true;
+ for (size_t i = 0; i < spaces_.size(); i++) {
+ if (spaces_[i]->Contains(obj)) {
+ return true;
+ }
+ }
+ return false;
}
bool Heap::IsLiveObjectLocked(const Object* obj) {
@@ -209,8 +220,6 @@
if (!IsAligned<kObjectAlignment>(obj)) {
LOG(FATAL) << "Object isn't aligned: " << obj;
} else if (!live_bitmap_->Test(obj)) {
- // TODO: we don't hold a lock here as it is assumed the live bit map
- // isn't changing if the mutator is running.
LOG(FATAL) << "Object is dead: " << obj;
}
// Ignore early dawn of the universe verifications
@@ -228,11 +237,9 @@
// Check obj.getClass().getClass() == obj.getClass().getClass().getClass()
// Note: we don't use the accessors here as they have internal sanity checks
// that we don't want to run
- raw_addr = reinterpret_cast<const byte*>(c) +
- Object::ClassOffset().Int32Value();
+ raw_addr = reinterpret_cast<const byte*>(c) + Object::ClassOffset().Int32Value();
const Class* c_c = *reinterpret_cast<Class* const *>(raw_addr);
- raw_addr = reinterpret_cast<const byte*>(c_c) +
- Object::ClassOffset().Int32Value();
+ raw_addr = reinterpret_cast<const byte*>(c_c) + Object::ClassOffset().Int32Value();
const Class* c_c_c = *reinterpret_cast<Class* const *>(raw_addr);
CHECK_EQ(c_c, c_c_c);
}
@@ -249,7 +256,7 @@
live_bitmap_->Walk(Heap::VerificationCallback, NULL);
}
-void Heap::RecordAllocationLocked(Space* space, const Object* obj) {
+void Heap::RecordAllocationLocked(AllocSpace* space, const Object* obj) {
#ifndef NDEBUG
if (Runtime::Current()->IsStarted()) {
lock_->AssertHeld();
@@ -296,29 +303,10 @@
}
}
-void Heap::RecordImageAllocations(Space* space) {
- if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
- LOG(INFO) << "Heap::RecordImageAllocations entering";
- }
- DCHECK(!Runtime::Current()->IsStarted());
- CHECK(space != NULL);
- CHECK(live_bitmap_ != NULL);
- byte* current = space->GetBase() + RoundUp(sizeof(ImageHeader), kObjectAlignment);
- while (current < space->GetLimit()) {
- DCHECK_ALIGNED(current, kObjectAlignment);
- const Object* obj = reinterpret_cast<const Object*>(current);
- live_bitmap_->Set(obj);
- current += RoundUp(obj->SizeOf(), kObjectAlignment);
- }
- if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
- LOG(INFO) << "Heap::RecordImageAllocations exiting";
- }
-}
-
Object* Heap::AllocateLocked(size_t size) {
lock_->AssertHeld();
DCHECK(alloc_space_ != NULL);
- Space* space = alloc_space_;
+ AllocSpace* space = alloc_space_;
Object* obj = AllocateLocked(space, size);
if (obj != NULL) {
RecordAllocationLocked(space, obj);
@@ -326,30 +314,31 @@
return obj;
}
-Object* Heap::AllocateLocked(Space* space, size_t size) {
+Object* Heap::AllocateLocked(AllocSpace* space, size_t alloc_size) {
lock_->AssertHeld();
// Since allocation can cause a GC which will need to SuspendAll,
// make sure all allocators are in the kRunnable state.
DCHECK_EQ(Thread::Current()->GetState(), Thread::kRunnable);
- // Fail impossible allocations. TODO: collect soft references.
- if (size > growth_size_) {
+ // Fail impossible allocations
+ if (alloc_size > space->Capacity()) {
+ // On failure collect soft references
+ CollectGarbageInternal(true);
return NULL;
}
- Object* ptr = space->AllocWithoutGrowth(size);
+ Object* ptr = space->AllocWithoutGrowth(alloc_size);
if (ptr != NULL) {
return ptr;
}
- // The allocation failed. If the GC is running, block until it
- // completes and retry.
+ // The allocation failed. If the GC is running, block until it completes and retry.
if (is_gc_running_) {
- // The GC is concurrently tracing the heap. Release the heap
- // lock, wait for the GC to complete, and retrying allocating.
+ // The GC is concurrently tracing the heap. Release the heap lock, wait for the GC to
+ // complete, and retrying allocating.
WaitForConcurrentGcToComplete();
- ptr = space->AllocWithoutGrowth(size);
+ ptr = space->AllocWithoutGrowth(alloc_size);
if (ptr != NULL) {
return ptr;
}
@@ -362,23 +351,23 @@
++Runtime::Current()->GetStats()->gc_for_alloc_count;
++Thread::Current()->GetStats()->gc_for_alloc_count;
}
- CollectGarbageInternal();
- ptr = space->AllocWithoutGrowth(size);
+ CollectGarbageInternal(false);
+ ptr = space->AllocWithoutGrowth(alloc_size);
if (ptr != NULL) {
return ptr;
}
// Even that didn't work; this is an exceptional state.
// Try harder, growing the heap if necessary.
- ptr = space->AllocWithGrowth(size);
+ ptr = space->AllocWithGrowth(alloc_size);
if (ptr != NULL) {
//size_t new_footprint = dvmHeapSourceGetIdealFootprint();
- size_t new_footprint = space->GetMaxAllowedFootprint();
+ size_t new_footprint = space->GetFootprintLimit();
// OLD-TODO: may want to grow a little bit more so that the amount of
// free space is equal to the old free space + the
// utilization slop for the new allocation.
VLOG(gc) << "Grow heap (frag case) to " << (new_footprint/KB) << "KiB "
- << "for a " << size << "-byte allocation";
+ << "for a " << alloc_size << "-byte allocation";
return ptr;
}
@@ -389,14 +378,14 @@
// cleared before throwing an OOME.
// OLD-TODO: wait for the finalizers from the previous GC to finish
- VLOG(gc) << "Forcing collection of SoftReferences for " << size << "-byte allocation";
- CollectGarbageInternal();
- ptr = space->AllocWithGrowth(size);
+ VLOG(gc) << "Forcing collection of SoftReferences for " << alloc_size << "-byte allocation";
+ CollectGarbageInternal(true);
+ ptr = space->AllocWithGrowth(alloc_size);
if (ptr != NULL) {
return ptr;
}
- LOG(ERROR) << "Out of memory on a " << size << "-byte allocation";
+ LOG(ERROR) << "Out of memory on a " << alloc_size << "-byte allocation";
// TODO: tell the HeapSource to dump its state
// TODO: dump stack traces for all threads
@@ -405,15 +394,15 @@
}
int64_t Heap::GetMaxMemory() {
- return growth_size_;
+ return alloc_space_->Capacity();
}
int64_t Heap::GetTotalMemory() {
- return alloc_space_->Size();
+ return alloc_space_->Capacity();
}
int64_t Heap::GetFreeMemory() {
- return alloc_space_->Size() - num_bytes_allocated_;
+ return alloc_space_->Capacity() - num_bytes_allocated_;
}
class InstanceCounter {
@@ -456,12 +445,12 @@
return counter.GetCount();
}
-void Heap::CollectGarbage() {
+void Heap::CollectGarbage(bool clear_soft_references) {
ScopedHeapLock lock;
- CollectGarbageInternal();
+ CollectGarbageInternal(clear_soft_references);
}
-void Heap::CollectGarbageInternal() {
+void Heap::CollectGarbageInternal(bool clear_soft_references) {
lock_->AssertHeld();
ThreadList* thread_list = Runtime::Current()->GetThreadList();
@@ -501,7 +490,7 @@
// re-mark root set
// scan dirty objects
- mark_sweep.ProcessReferences(false);
+ mark_sweep.ProcessReferences(clear_soft_references);
timings.AddSplit("ProcessReferences");
// TODO: if concurrent
@@ -546,13 +535,6 @@
lock_->AssertHeld();
}
-void Heap::WalkHeap(void(*callback)(const void*, size_t, const void*, size_t, void*), void* arg) {
- typedef std::vector<Space*>::iterator It; // C++0x auto.
- for (It it = spaces_.begin(); it != spaces_.end(); ++it) {
- (*it)->Walk(callback, arg);
- }
-}
-
/* Terminology:
* 1. Footprint: Capacity we allocate from system.
* 2. Active space: a.k.a. alloc_space_.
@@ -575,13 +557,14 @@
// Old spaces will count against the ideal size.
//
void Heap::SetIdealFootprint(size_t max_allowed_footprint) {
- if (max_allowed_footprint > Heap::growth_size_) {
+ size_t alloc_space_capacity = alloc_space_->Capacity();
+ if (max_allowed_footprint > alloc_space_capacity) {
VLOG(gc) << "Clamp target GC heap from " << (max_allowed_footprint/KB) << "KiB"
- << " to " << (Heap::growth_size_/KB) << "KiB";
- max_allowed_footprint = Heap::growth_size_;
+ << " to " << (alloc_space_capacity/KB) << "KiB";
+ max_allowed_footprint = alloc_space_capacity;
}
- alloc_space_->SetMaxAllowedFootprint(max_allowed_footprint);
+ alloc_space_->SetFootprintLimit(max_allowed_footprint);
}
// kHeapIdealFree is the ideal maximum free size, when we grow the heap for
@@ -615,10 +598,7 @@
void Heap::ClearGrowthLimit() {
ScopedHeapLock lock;
WaitForConcurrentGcToComplete();
- CHECK_GE(maximum_size_, growth_size_);
- growth_size_ = maximum_size_;
alloc_space_->ClearGrowthLimit();
- card_table_->ClearGrowthLimit();
}
pid_t Heap::GetLockOwner() {
diff --git a/src/heap.h b/src/heap.h
index 2e9aa35..678f876 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -21,6 +21,7 @@
#include "card_table.h"
#include "globals.h"
+#include "gtest/gtest.h"
#include "heap_bitmap.h"
#include "mutex.h"
#include "offsets.h"
@@ -29,17 +30,19 @@
namespace art {
+class AllocSpace;
class Class;
class Object;
class Space;
class Thread;
class HeapBitmap;
+class SpaceTest;
class Heap {
public:
- static const size_t kInitialSize = 4 * MB;
+ static const size_t kInitialSize = 2 * MB;
- static const size_t kMaximumSize = 16 * MB;
+ static const size_t kMaximumSize = 32 * MB;
typedef void (RootVisitor)(const Object* root, void* arg);
typedef bool (IsMarkedTester)(const Object* object, void* arg);
@@ -47,7 +50,7 @@
// Create a heap with the requested sizes. The possible empty
// image_file_names names specify Spaces to load based on
// ImageWriter output.
- static void Init(size_t starting_size, size_t maximum_size, size_t growth_size,
+ static void Init(size_t starting_size, size_t growth_limit, size_t capacity,
const std::vector<std::string>& image_file_names);
static void Destroy();
@@ -74,7 +77,7 @@
static bool IsLiveObjectLocked(const Object* obj);
// Initiates an explicit garbage collection.
- static void CollectGarbage();
+ static void CollectGarbage(bool clear_soft_references);
// Implements java.lang.Runtime.maxMemory.
static int64_t GetMaxMemory();
@@ -89,12 +92,16 @@
// Implements dalvik.system.VMRuntime.clearGrowthLimit.
static void ClearGrowthLimit();
- // Implements dalvik.system.VMRuntime.getTargetHeapUtilization.
+ // Target ideal heap utilization ratio, implements
+ // dalvik.system.VMRuntime.getTargetHeapUtilization.
static float GetTargetHeapUtilization() {
return target_utilization_;
}
- // Implements dalvik.system.VMRuntime.setTargetHeapUtilization.
+ // Set target ideal heap utilization ratio, implements
+ // dalvik.system.VMRuntime.setTargetHeapUtilization.
static void SetTargetHeapUtilization(float target) {
+ DCHECK_GT(target, 0.0f); // asserted in Java code
+ DCHECK_LT(target, 1.0f);
target_utilization_ = target;
}
// Sets the maximum number of bytes that the heap is allowed to allocate
@@ -155,6 +162,9 @@
}
static void EnableObjectValidation() {
+#if VERIFY_OBJECT_ENABLED
+ Heap::VerifyHeap();
+#endif
verify_objects_ = true;
}
@@ -189,33 +199,34 @@
card_marking_disabled_ = true;
}
- // dlmalloc_walk_heap-compatible heap walker.
- static void WalkHeap(void(*callback)(const void*, size_t, const void*, size_t, void*), void* arg);
-
static void AddFinalizerReference(Thread* self, Object* object);
static size_t GetBytesAllocated() { return num_bytes_allocated_; }
static size_t GetObjectsAllocated() { return num_objects_allocated_; }
- static Space* GetAllocSpace() {
+ static AllocSpace* GetAllocSpace() {
return alloc_space_;
}
private:
// Allocates uninitialized storage.
static Object* AllocateLocked(size_t num_bytes);
- static Object* AllocateLocked(Space* space, size_t num_bytes);
+ static Object* AllocateLocked(AllocSpace* space, size_t num_bytes);
// Pushes a list of cleared references out to the managed heap.
static void EnqueueClearedReferences(Object** cleared_references);
- static void RecordAllocationLocked(Space* space, const Object* object);
+ static void RecordAllocationLocked(AllocSpace* space, const Object* object);
static void RecordImageAllocations(Space* space);
- static void CollectGarbageInternal();
+ static void CollectGarbageInternal(bool clear_soft_references);
static void GrowForUtilization();
+ static void AddSpace(Space* space) {
+ spaces_.push_back(space);
+ }
+
static void VerifyObjectLocked(const Object *obj);
static void VerificationCallback(Object* obj, void* arg);
@@ -225,7 +236,7 @@
static std::vector<Space*> spaces_;
// default Space for allocations
- static Space* alloc_space_;
+ static AllocSpace* alloc_space_;
static HeapBitmap* mark_bitmap_;
@@ -237,16 +248,6 @@
// TODO: remove
static bool card_marking_disabled_;
- // The maximum size of the heap in bytes.
- static size_t maximum_size_;
-
- // The largest size the heap may grow. This value allows the app to limit the
- // growth below the maximum size. This is a work around until we can
- // dynamically set the maximum size. This value can range between the starting
- // size and the maximum size but should never be set below the current
- // footprint of the heap.
- static size_t growth_size_;
-
// True while the garbage collector is running.
static bool is_gc_running_;
@@ -281,6 +282,8 @@
static bool verify_objects_;
+ FRIEND_TEST(SpaceTest, AllocAndFree);
+
DISALLOW_IMPLICIT_CONSTRUCTORS(Heap);
};
diff --git a/src/heap_bitmap.cc b/src/heap_bitmap.cc
index 2adeedc..57c60ba 100644
--- a/src/heap_bitmap.cc
+++ b/src/heap_bitmap.cc
@@ -22,30 +22,16 @@
namespace art {
-HeapBitmap* HeapBitmap::Create(const char* name, byte* base, size_t length) {
- UniquePtr<HeapBitmap> bitmap(new HeapBitmap(base, length));
- if (!bitmap->Init(name, base, length)) {
+HeapBitmap* HeapBitmap::Create(const char* name, byte* heap_begin, size_t heap_capacity) {
+ CHECK(heap_begin != NULL);
+ size_t bitmap_size = HB_OFFSET_TO_INDEX(heap_capacity) * kWordSize;
+ UniquePtr<MemMap> mem_map(MemMap::MapAnonymous(name, NULL, bitmap_size, PROT_READ | PROT_WRITE));
+ if (mem_map.get() == NULL) {
+ LOG(ERROR) << "Failed to allocate bitmap " << name;
return NULL;
- } else {
- return bitmap.release();
}
-}
-
-// Initialize a HeapBitmap so that it points to a bitmap large enough
-// to cover a heap at <base> of <max_size> bytes, where objects are
-// guaranteed to be kAlignment-aligned.
-bool HeapBitmap::Init(const char* name, const byte* base, size_t max_size) {
- CHECK(base != NULL);
- size_t length = HB_OFFSET_TO_INDEX(max_size) * kWordSize;
- mem_map_.reset(MemMap::MapAnonymous(name, NULL, length, PROT_READ | PROT_WRITE));
- if (mem_map_.get() == NULL) {
- return false;
- }
- words_ = reinterpret_cast<word*>(mem_map_->GetAddress());
- num_bytes_ = length;
- base_ = reinterpret_cast<uintptr_t>(base);
- max_ = base_ - 1;
- return true;
+ word* bitmap_begin = reinterpret_cast<word*>(mem_map->Begin());
+ return new HeapBitmap(name, mem_map.release(), bitmap_begin, bitmap_size, heap_begin);
}
// Clean up any resources associated with the bitmap.
@@ -54,37 +40,36 @@
// Fill the bitmap with zeroes. Returns the bitmap's memory to the
// system as a side-effect.
void HeapBitmap::Clear() {
- if (words_ != NULL) {
+ if (bitmap_begin_ != NULL) {
// This returns the memory to the system. Successive page faults
// will return zeroed memory.
- int result = madvise(words_, num_bytes_, MADV_DONTNEED);
+ int result = madvise(bitmap_begin_, bitmap_size_, MADV_DONTNEED);
if (result == -1) {
PLOG(WARNING) << "madvise failed";
}
- max_ = base_ - 1;
+ heap_end_ = heap_begin_ - 1;
}
}
-// Return true iff <obj> is within the range of pointers that this
-// bitmap could potentially cover, even if a bit has not been set for
-// it.
+// Return true iff <obj> is within the range of pointers that this bitmap could potentially cover,
+// even if a bit has not been set for it.
bool HeapBitmap::HasAddress(const void* obj) const {
if (obj != NULL) {
- const uintptr_t offset = (uintptr_t)obj - base_;
+ const uintptr_t offset = (uintptr_t)obj - heap_begin_;
const size_t index = HB_OFFSET_TO_INDEX(offset);
- return index < num_bytes_ / kWordSize;
+ return index < bitmap_size_ / kWordSize;
}
return false;
}
-void HeapBitmap::VisitRange(uintptr_t base, uintptr_t max, Callback* visitor, void* arg) const {
- size_t start = HB_OFFSET_TO_INDEX(base - base_);
- size_t end = HB_OFFSET_TO_INDEX(max - base_ - 1);
+void HeapBitmap::VisitRange(uintptr_t visit_begin, uintptr_t visit_end, Callback* visitor, void* arg) const {
+ size_t start = HB_OFFSET_TO_INDEX(visit_begin - heap_begin_);
+ size_t end = HB_OFFSET_TO_INDEX(visit_end - heap_begin_ - 1);
for (size_t i = start; i <= end; i++) {
- word w = words_[i];
+ word w = bitmap_begin_[i];
if (w != 0) {
word high_bit = 1 << (kBitsPerWord - 1);
- uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + base_;
+ uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + heap_begin_;
while (w != 0) {
const int shift = CLZ(w);
Object* obj = reinterpret_cast<Object*>(ptr_base + shift * kAlignment);
@@ -98,14 +83,14 @@
// Visits set bits in address order. The callback is not permitted to
// change the bitmap bits or max during the traversal.
void HeapBitmap::Walk(HeapBitmap::Callback* callback, void* arg) {
- CHECK(words_ != NULL);
+ CHECK(bitmap_begin_ != NULL);
CHECK(callback != NULL);
- uintptr_t end = HB_OFFSET_TO_INDEX(max_ - base_);
+ uintptr_t end = HB_OFFSET_TO_INDEX(heap_end_ - heap_begin_);
for (uintptr_t i = 0; i <= end; ++i) {
- word w = words_[i];
+ word w = bitmap_begin_[i];
if (UNLIKELY(w != 0)) {
word high_bit = 1 << (kBitsPerWord - 1);
- uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + base_;
+ uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + heap_begin_;
while (w != 0) {
const int shift = CLZ(w);
Object* obj = reinterpret_cast<Object*>(ptr_base + shift * kAlignment);
@@ -116,32 +101,30 @@
}
}
-// Similar to Walk but the callback routine is permitted to change the
-// bitmap bits and max during traversal. Used by the the root marking
-// scan exclusively.
+// Similar to Walk but the callback routine is permitted to change the bitmap bits and end during
+// traversal. Used by the the root marking scan exclusively.
//
-// The callback is invoked with a finger argument. The finger is a
-// pointer to an address not yet visited by the traversal. If the
-// callback sets a bit for an address at or above the finger, this
-// address will be visited by the traversal. If the callback sets a
-// bit for an address below the finger, this address will not be
-// visited.
-void HeapBitmap::ScanWalk(uintptr_t base, uintptr_t max, ScanCallback* callback, void* arg) {
- CHECK(words_ != NULL);
+// The callback is invoked with a finger argument. The finger is a pointer to an address not yet
+// visited by the traversal. If the callback sets a bit for an address at or above the finger, this
+// address will be visited by the traversal. If the callback sets a bit for an address below the
+// finger, this address will not be visited (typiscally such an address would be placed on the
+// marking stack).
+void HeapBitmap::ScanWalk(uintptr_t scan_begin, uintptr_t scan_end, ScanCallback* callback, void* arg) {
+ CHECK(bitmap_begin_ != NULL);
CHECK(callback != NULL);
- CHECK_LE(base, max);
- CHECK_GE(base, base_);
- size_t start = HB_OFFSET_TO_INDEX(base - base_);
- if (max < max_) {
+ CHECK_LE(scan_begin, scan_end);
+ CHECK_GE(scan_begin, heap_begin_);
+ size_t start = HB_OFFSET_TO_INDEX(scan_begin - heap_begin_);
+ if (scan_end < heap_end_) {
// The end of the space we're looking at is before the current maximum bitmap PC, scan to that
// and don't recompute end on each iteration
- size_t end = HB_OFFSET_TO_INDEX(max - base_ - 1);
+ size_t end = HB_OFFSET_TO_INDEX(scan_end - heap_begin_ - 1);
for (size_t i = start; i <= end; i++) {
- word w = words_[i];
+ word w = bitmap_begin_[i];
if (UNLIKELY(w != 0)) {
word high_bit = 1 << (kBitsPerWord - 1);
- uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + base_;
- void* finger = reinterpret_cast<void*>(HB_INDEX_TO_OFFSET(i + 1) + base_);
+ uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + heap_begin_;
+ void* finger = reinterpret_cast<void*>(HB_INDEX_TO_OFFSET(i + 1) + heap_begin_);
while (w != 0) {
const int shift = CLZ(w);
Object* obj = reinterpret_cast<Object*>(ptr_base + shift * kAlignment);
@@ -151,13 +134,13 @@
}
}
} else {
- size_t end = HB_OFFSET_TO_INDEX(max_ - base_);
+ size_t end = HB_OFFSET_TO_INDEX(heap_end_ - heap_begin_);
for (size_t i = start; i <= end; i++) {
- word w = words_[i];
+ word w = bitmap_begin_[i];
if (UNLIKELY(w != 0)) {
word high_bit = 1 << (kBitsPerWord - 1);
- uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + base_;
- void* finger = reinterpret_cast<void*>(HB_INDEX_TO_OFFSET(i + 1) + base_);
+ uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + heap_begin_;
+ void* finger = reinterpret_cast<void*>(HB_INDEX_TO_OFFSET(i + 1) + heap_begin_);
while (w != 0) {
const int shift = CLZ(w);
Object* obj = reinterpret_cast<Object*>(ptr_base + shift * kAlignment);
@@ -165,7 +148,8 @@
w &= ~(high_bit >> shift);
}
}
- end = HB_OFFSET_TO_INDEX(max_ - base_);
+ // update 'end' in case callback modified bitmap
+ end = HB_OFFSET_TO_INDEX(heap_end_ - heap_begin_);
}
}
}
@@ -177,37 +161,37 @@
// The callback is not permitted to increase the max of either bitmap.
void HeapBitmap::SweepWalk(const HeapBitmap& live_bitmap,
const HeapBitmap& mark_bitmap,
- uintptr_t base, uintptr_t max,
+ uintptr_t sweep_begin, uintptr_t sweep_end,
HeapBitmap::SweepCallback* callback, void* arg) {
- CHECK(live_bitmap.words_ != NULL);
- CHECK(mark_bitmap.words_ != NULL);
- CHECK_EQ(live_bitmap.base_, mark_bitmap.base_);
- CHECK_EQ(live_bitmap.num_bytes_, mark_bitmap.num_bytes_);
+ CHECK(live_bitmap.bitmap_begin_ != NULL);
+ CHECK(mark_bitmap.bitmap_begin_ != NULL);
+ CHECK_EQ(live_bitmap.heap_begin_, mark_bitmap.heap_begin_);
+ CHECK_EQ(live_bitmap.bitmap_size_, mark_bitmap.bitmap_size_);
CHECK(callback != NULL);
- CHECK_LE(base, max);
- CHECK_GE(base, live_bitmap.base_);
- max = std::min(max - 1, live_bitmap.max_);
- if (live_bitmap.max_ < live_bitmap.base_) {
+ CHECK_LE(sweep_begin, sweep_end);
+ CHECK_GE(sweep_begin, live_bitmap.heap_begin_);
+ sweep_end = std::min(sweep_end - 1, live_bitmap.heap_end_);
+ if (live_bitmap.heap_end_ < live_bitmap.heap_begin_) {
// Easy case; both are obviously empty.
// TODO: this should never happen
return;
}
- // TODO: rewrite the callbacks to accept a std::vector<void*> rather than a void**?
- std::vector<void*> pointer_buf(4 * kBitsPerWord);
- void** pb = &pointer_buf[0];
- size_t start = HB_OFFSET_TO_INDEX(base - live_bitmap.base_);
- size_t end = HB_OFFSET_TO_INDEX(max - live_bitmap.base_);
- word* live = live_bitmap.words_;
- word* mark = mark_bitmap.words_;
+ // TODO: rewrite the callbacks to accept a std::vector<Object*> rather than a Object**?
+ std::vector<Object*> pointer_buf(4 * kBitsPerWord);
+ Object** pb = &pointer_buf[0];
+ size_t start = HB_OFFSET_TO_INDEX(sweep_begin - live_bitmap.heap_begin_);
+ size_t end = HB_OFFSET_TO_INDEX(sweep_end - live_bitmap.heap_begin_);
+ word* live = live_bitmap.bitmap_begin_;
+ word* mark = mark_bitmap.bitmap_begin_;
for (size_t i = start; i <= end; i++) {
word garbage = live[i] & ~mark[i];
if (UNLIKELY(garbage != 0)) {
word high_bit = 1 << (kBitsPerWord - 1);
- uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + live_bitmap.base_;
+ uintptr_t ptr_base = HB_INDEX_TO_OFFSET(i) + live_bitmap.heap_begin_;
while (garbage != 0) {
int shift = CLZ(garbage);
garbage &= ~(high_bit >> shift);
- *pb++ = reinterpret_cast<void*>(ptr_base + shift * kAlignment);
+ *pb++ = reinterpret_cast<Object*>(ptr_base + shift * kAlignment);
}
// Make sure that there are always enough slots available for an
// entire word of one bits.
diff --git a/src/heap_bitmap.h b/src/heap_bitmap.h
index 31adebc..0d6de60 100644
--- a/src/heap_bitmap.h
+++ b/src/heap_bitmap.h
@@ -51,9 +51,11 @@
typedef void ScanCallback(Object* obj, void* finger, void* arg);
- typedef void SweepCallback(size_t numPtrs, void** ptrs, void* arg);
+ typedef void SweepCallback(size_t numPtrs, Object** ptrs, void* arg);
- static HeapBitmap* Create(const char* name, byte* base, size_t length);
+ // Initialize a HeapBitmap so that it points to a bitmap large enough to cover a heap at
+ // heap_begin of heap_capacity bytes, where objects are guaranteed to be kAlignment-aligned.
+ static HeapBitmap* Create(const char* name, byte* heap_begin, size_t heap_capacity);
~HeapBitmap();
@@ -70,11 +72,11 @@
inline bool Test(const Object* obj) {
uintptr_t addr = reinterpret_cast<uintptr_t>(obj);
DCHECK(HasAddress(obj)) << obj;
- DCHECK(words_ != NULL);
- DCHECK_GE(addr, base_);
- if (addr <= max_) {
- const uintptr_t offset = addr - base_;
- return (words_[HB_OFFSET_TO_INDEX(offset)] & HB_OFFSET_TO_MASK(offset)) != 0;
+ DCHECK(bitmap_begin_ != NULL);
+ DCHECK_GE(addr, heap_begin_);
+ if (addr <= heap_end_) {
+ const uintptr_t offset = addr - heap_begin_;
+ return (bitmap_begin_[HB_OFFSET_TO_INDEX(offset)] & HB_OFFSET_TO_MASK(offset)) != 0;
} else {
return false;
}
@@ -94,47 +96,50 @@
SweepCallback* thunk, void* arg);
private:
- HeapBitmap(const void* base, size_t length)
- : words_(NULL),
- num_bytes_(length),
- base_(reinterpret_cast<uintptr_t>(base)) {
- };
+ // TODO: heap_end_ is initialized so that the heap bitmap is empty, this doesn't require the -1,
+ // however, we document that this is expected on heap_end_
+ HeapBitmap(const char* name, MemMap* mem_map, word* bitmap_begin, size_t bitmap_size, const void* heap_begin)
+ : mem_map_(mem_map), bitmap_begin_(bitmap_begin), bitmap_size_(bitmap_size),
+ heap_begin_(reinterpret_cast<uintptr_t>(heap_begin)), heap_end_(heap_begin_ - 1),
+ name_(name) {}
inline void Modify(const Object* obj, bool do_set) {
uintptr_t addr = reinterpret_cast<uintptr_t>(obj);
- DCHECK_GE(addr, base_);
- const uintptr_t offset = addr - base_;
+ DCHECK_GE(addr, heap_begin_);
+ const uintptr_t offset = addr - heap_begin_;
const size_t index = HB_OFFSET_TO_INDEX(offset);
const word mask = HB_OFFSET_TO_MASK(offset);
- DCHECK_LT(index, num_bytes_ / kWordSize);
+ DCHECK_LT(index, bitmap_size_ / kWordSize);
if (do_set) {
- if (addr > max_) {
- max_ = addr;
+ if (addr > heap_end_) {
+ heap_end_ = addr;
}
- words_[index] |= mask;
+ bitmap_begin_[index] |= mask;
} else {
- words_[index] &= ~mask;
+ bitmap_begin_[index] &= ~mask;
}
}
- bool Init(const char* name, const byte* base, size_t length);
-
+ // Backing storage for bitmap.
UniquePtr<MemMap> mem_map_;
- word* words_;
+ // This bitmap itself, word sized for efficiency in scanning.
+ word* const bitmap_begin_;
- size_t num_bytes_;
+ // Size of this bitmap.
+ const size_t bitmap_size_;
- // The base address, which corresponds to the word containing the
- // first bit in the bitmap.
- uintptr_t base_;
+ // The base address of the heap, which corresponds to the word containing the first bit in the
+ // bitmap.
+ const uintptr_t heap_begin_;
// The highest pointer value ever returned by an allocation from
// this heap. I.e., the highest address that may correspond to a
- // set bit. If there are no bits set, (max_ < base_).
- uintptr_t max_;
+ // set bit. If there are no bits set, (heap_end_ < heap_begin_).
+ uintptr_t heap_end_;
- const char* name_;
+ // Name of this bitmap.
+ const char* const name_;
};
} // namespace art
diff --git a/src/heap_test.cc b/src/heap_test.cc
index 77b98e4..2208e57 100644
--- a/src/heap_test.cc
+++ b/src/heap_test.cc
@@ -27,7 +27,7 @@
}
}
- Heap::CollectGarbage();
+ Heap::CollectGarbage(false);
}
} // namespace art
diff --git a/src/image.h b/src/image.h
index 76db7e5..d0071d6 100644
--- a/src/image.h
+++ b/src/image.h
@@ -15,21 +15,21 @@
public:
ImageHeader() {}
- ImageHeader(uint32_t image_base_addr,
+ ImageHeader(uint32_t image_begin,
uint32_t image_roots,
uint32_t oat_checksum,
- uint32_t oat_base_addr,
- uint32_t oat_limit_addr)
- : image_base_addr_(image_base_addr),
+ uint32_t oat_begin,
+ uint32_t oat_end)
+ : image_begin_(image_begin),
oat_checksum_(oat_checksum),
- oat_base_addr_(oat_base_addr),
- oat_limit_addr_(oat_limit_addr),
+ oat_begin_(oat_begin),
+ oat_end_(oat_end),
image_roots_(image_roots) {
- CHECK_EQ(image_base_addr, RoundUp(image_base_addr, kPageSize));
- CHECK_EQ(oat_base_addr, RoundUp(oat_base_addr, kPageSize));
- CHECK_LT(image_base_addr, image_roots);
- CHECK_LT(image_roots, oat_base_addr);
- CHECK_LT(oat_base_addr, oat_limit_addr);
+ CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
+ CHECK_EQ(oat_begin, RoundUp(oat_begin, kPageSize));
+ CHECK_LT(image_begin, image_roots);
+ CHECK_LT(image_roots, oat_begin);
+ CHECK_LT(oat_begin, oat_end);
memcpy(magic_, kImageMagic, sizeof(kImageMagic));
memcpy(version_, kImageVersion, sizeof(kImageVersion));
}
@@ -49,20 +49,20 @@
return reinterpret_cast<const char*>(magic_);
}
- byte* GetImageBaseAddr() const {
- return reinterpret_cast<byte*>(image_base_addr_);
+ byte* GetImageBegin() const {
+ return reinterpret_cast<byte*>(image_begin_);
}
uint32_t GetOatChecksum() const {
return oat_checksum_;
}
- byte* GetOatBaseAddr() const {
- return reinterpret_cast<byte*>(oat_base_addr_);
+ byte* GetOatBegin() const {
+ return reinterpret_cast<byte*>(oat_begin_);
}
- byte* GetOatLimitAddr() const {
- return reinterpret_cast<byte*>(oat_limit_addr_);
+ byte* GetOatEnd() const {
+ return reinterpret_cast<byte*>(oat_end_);
}
enum ImageRoot {
@@ -96,16 +96,16 @@
byte version_[4];
// required base address for mapping the image.
- uint32_t image_base_addr_;
+ uint32_t image_begin_;
// checksum of the oat file we link to for load time sanity check
uint32_t oat_checksum_;
// required oat address expected by image Method::GetCode() pointers.
- uint32_t oat_base_addr_;
+ uint32_t oat_begin_;
// end of oat address range for this image file, used for positioning a following image
- uint32_t oat_limit_addr_;
+ uint32_t oat_end_;
// absolute address of an Object[] of objects needed to reinitialize from an image
uint32_t image_roots_;
diff --git a/src/image_test.cc b/src/image_test.cc
index f5f96d8..950ca92 100644
--- a/src/image_test.cc
+++ b/src/image_test.cc
@@ -77,17 +77,17 @@
ASSERT_TRUE(Heap::GetSpaces()[0]->IsImageSpace());
ASSERT_FALSE(Heap::GetSpaces()[1]->IsImageSpace());
- Space* image_space = Heap::GetSpaces()[0];
- byte* image_base = image_space->GetBase();
- byte* image_limit = image_space->GetLimit();
- CHECK_EQ(requested_image_base, reinterpret_cast<uintptr_t>(image_base));
+ ImageSpace* image_space = Heap::GetSpaces()[0]->AsImageSpace();
+ byte* image_begin = image_space->Begin();
+ byte* image_end = image_space->End();
+ CHECK_EQ(requested_image_base, reinterpret_cast<uintptr_t>(image_begin));
for (size_t i = 0; i < dex->NumClassDefs(); i++) {
const DexFile::ClassDef& class_def = dex->GetClassDef(i);
const char* descriptor = dex->GetClassDescriptor(class_def);
Class* klass = class_linker_->FindSystemClass(descriptor);
EXPECT_TRUE(klass != NULL) << descriptor;
- EXPECT_LT(image_base, reinterpret_cast<byte*>(klass)) << descriptor;
- EXPECT_LT(reinterpret_cast<byte*>(klass), image_limit) << descriptor;
+ EXPECT_LT(image_begin, reinterpret_cast<byte*>(klass)) << descriptor;
+ EXPECT_LT(reinterpret_cast<byte*>(klass), image_end) << descriptor;
EXPECT_EQ(*klass->GetRawLockWordAddress(), 0); // address should have been removed from monitor
}
}
diff --git a/src/image_writer.cc b/src/image_writer.cc
index 861a878..ca57f41 100644
--- a/src/image_writer.cc
+++ b/src/image_writer.cc
@@ -26,13 +26,13 @@
namespace art {
bool ImageWriter::Write(const char* image_filename,
- uintptr_t image_base,
+ uintptr_t image_begin,
const std::string& oat_filename,
const std::string& strip_location_prefix) {
CHECK(image_filename != NULL);
- CHECK_NE(image_base, 0U);
- image_base_ = reinterpret_cast<byte*>(image_base);
+ CHECK_NE(image_begin, 0U);
+ image_begin_ = reinterpret_cast<byte*>(image_begin);
const std::vector<Space*>& spaces = Heap::GetSpaces();
// currently just write the last space, assuming it is the space that was being used for allocation
@@ -59,7 +59,7 @@
return false;
}
PruneNonImageClasses();
- Heap::CollectGarbage();
+ Heap::CollectGarbage(false);
#ifndef NDEBUG
CheckNonImageClassesRemoved();
#endif
@@ -72,7 +72,7 @@
LOG(ERROR) << "Failed to open image file " << image_filename;
return false;
}
- bool success = file->WriteFully(image_->GetAddress(), image_top_);
+ bool success = file->WriteFully(image_->Begin(), image_end_);
if (!success) {
PLOG(ERROR) << "Failed to write image file " << image_filename;
return false;
@@ -273,26 +273,26 @@
HeapBitmap* heap_bitmap = Heap::GetLiveBits();
DCHECK(heap_bitmap != NULL);
- DCHECK_EQ(0U, image_top_);
+ DCHECK_EQ(0U, image_end_);
// leave space for the header, but do not write it yet, we need to
// know where image_roots is going to end up
- image_top_ += RoundUp(sizeof(ImageHeader), 8); // 64-bit-alignment
+ image_end_ += RoundUp(sizeof(ImageHeader), 8); // 64-bit-alignment
heap_bitmap->Walk(CalculateNewObjectOffsetsCallback, this); // TODO: add Space-limited Walk
- DCHECK_LT(image_top_, image_->GetLength());
+ DCHECK_LT(image_end_, image_->Size());
// Note that image_top_ is left at end of used space
- oat_base_ = image_base_ + RoundUp(image_top_, kPageSize);
- const byte* oat_limit = oat_base_ + oat_file_->GetSize();
+ oat_begin_ = image_begin_ + RoundUp(image_end_, kPageSize);
+ const byte* oat_limit = oat_begin_ + oat_file_->Size();
// return to write header at start of image with future location of image_roots
- ImageHeader image_header(reinterpret_cast<uint32_t>(image_base_),
+ ImageHeader image_header(reinterpret_cast<uint32_t>(image_begin_),
reinterpret_cast<uint32_t>(GetImageAddress(image_roots.get())),
oat_file_->GetOatHeader().GetChecksum(),
- reinterpret_cast<uint32_t>(oat_base_),
+ reinterpret_cast<uint32_t>(oat_begin_),
reinterpret_cast<uint32_t>(oat_limit));
- memcpy(image_->GetAddress(), &image_header, sizeof(image_header));
+ memcpy(image_->Begin(), &image_header, sizeof(image_header));
}
void ImageWriter::CopyAndFixupObjects() {
@@ -315,10 +315,10 @@
// see GetLocalAddress for similar computation
size_t offset = image_writer->GetImageOffset(obj);
- byte* dst = image_writer->image_->GetAddress() + offset;
+ byte* dst = image_writer->image_->Begin() + offset;
const byte* src = reinterpret_cast<const byte*>(obj);
size_t n = obj->SizeOf();
- DCHECK_LT(offset + n, image_writer->image_->GetLength());
+ DCHECK_LT(offset + n, image_writer->image_->Size());
memcpy(dst, src, n);
Object* copy = reinterpret_cast<Object*>(dst);
ResetImageOffset(copy);
@@ -363,7 +363,7 @@
FixupInstanceFields(orig, copy);
// OatWriter replaces the code_ and invoke_stub_ with offset values.
- // Here we readjust to a pointer relative to oat_base_
+ // Here we readjust to a pointer relative to oat_begin_
// Every type of method can have an invoke stub
uint32_t invoke_stub_offset = orig->GetOatInvokeStubOffset();
diff --git a/src/image_writer.h b/src/image_writer.h
index d32724c..d834361 100644
--- a/src/image_writer.h
+++ b/src/image_writer.h
@@ -23,12 +23,13 @@
class ImageWriter {
public:
explicit ImageWriter(const std::set<std::string>* image_classes)
- : source_space_(NULL), image_top_(0), image_base_(NULL), image_classes_(image_classes) {}
+ : source_space_(NULL), image_end_(0), image_begin_(NULL), image_classes_(image_classes),
+ oat_begin_(NULL) {}
~ImageWriter() {}
bool Write(const char* image_filename,
- uintptr_t image_base,
+ uintptr_t image_begin,
const std::string& oat_filename,
const std::string& strip_location_prefix);
private:
@@ -39,9 +40,9 @@
void AssignImageOffset(Object* object) {
DCHECK(object != NULL);
DCHECK_EQ(object->monitor_, 0U); // should be no lock
- SetImageOffset(object, image_top_);
- image_top_ += RoundUp(object->SizeOf(), 8); // 64-bit alignment
- DCHECK_LT(image_top_, image_->GetLength());
+ SetImageOffset(object, image_end_);
+ image_end_ += RoundUp(object->SizeOf(), 8); // 64-bit alignment
+ DCHECK_LT(image_end_, image_->Size());
}
static void SetImageOffset(Object* object, size_t offset) {
DCHECK(object != NULL);
@@ -69,8 +70,7 @@
bool InSourceSpace(const Object* object) const {
DCHECK(source_space_ != NULL);
- const byte* o = reinterpret_cast<const byte*>(object);
- return (o >= source_space_->GetBase() && o < source_space_->GetLimit());
+ return source_space_->Contains(object);
}
Object* GetImageAddress(const Object* object) const {
if (object == NULL) {
@@ -80,20 +80,20 @@
if (!InSourceSpace(object)) {
return const_cast<Object*>(object);
}
- return reinterpret_cast<Object*>(image_base_ + GetImageOffset(object));
+ return reinterpret_cast<Object*>(image_begin_ + GetImageOffset(object));
}
Object* GetLocalAddress(const Object* object) const {
size_t offset = GetImageOffset(object);
- byte* dst = image_->GetAddress() + offset;
+ byte* dst = image_->Begin() + offset;
return reinterpret_cast<Object*>(dst);
}
const byte* GetOatAddress(uint32_t offset) const {
- DCHECK_LT(offset, oat_file_->GetSize());
+ DCHECK_LT(offset, oat_file_->Size());
if (offset == 0) {
return NULL;
}
- return oat_base_ + offset;
+ return oat_begin_ + offset;
}
bool IsImageClass(const Class* klass);
@@ -132,16 +132,16 @@
UniquePtr<MemMap> image_;
// Offset to the free space in image_
- size_t image_top_;
+ size_t image_end_;
- // Target image base address for the output image
- byte* image_base_;
+ // Beginning target image address for the output image
+ byte* image_begin_;
// Set of classes to be include in the image, or NULL for all.
const std::set<std::string>* image_classes_;
- // Target oat base address for the pointers from the output image to its oat file
- const byte* oat_base_;
+ // Beginning target oat address for the pointers from the output image to its oat file
+ const byte* oat_begin_;
// DexCaches seen while scanning for fixing up CodeAndDirectMethods
typedef std::set<DexCache*> Set;
diff --git a/src/java_lang_Runtime.cc b/src/java_lang_Runtime.cc
index 981db70..96337af 100644
--- a/src/java_lang_Runtime.cc
+++ b/src/java_lang_Runtime.cc
@@ -31,7 +31,7 @@
void Runtime_gc(JNIEnv*, jclass) {
ScopedThreadStateChange tsc(Thread::Current(), Thread::kRunnable);
- Heap::CollectGarbage();
+ Heap::CollectGarbage(false);
}
void Runtime_nativeExit(JNIEnv* env, jclass, jint status, jboolean isExit) {
diff --git a/src/mark_stack.cc b/src/mark_stack.cc
index 707b98b..917c7b4 100644
--- a/src/mark_stack.cc
+++ b/src/mark_stack.cc
@@ -25,9 +25,9 @@
ReadFileToString("/proc/self/maps", &maps);
LOG(FATAL) << "couldn't allocate mark stack\n" << maps;
}
- byte* addr = mem_map_->GetAddress();
+ byte* addr = mem_map_->Begin();
CHECK(addr != NULL);
- base_ = reinterpret_cast<const Object**>(addr);
+ begin_ = reinterpret_cast<const Object**>(addr);
limit_ = reinterpret_cast<const Object**>(addr + length);
ptr_ = reinterpret_cast<Object const**>(addr);
int result = madvise(addr, length, MADV_DONTNEED);
diff --git a/src/mark_stack.h b/src/mark_stack.h
index 47d18cd..28ad165 100644
--- a/src/mark_stack.h
+++ b/src/mark_stack.h
@@ -26,19 +26,19 @@
}
const Object* Pop() {
- DCHECK_NE(ptr_, base_);
+ DCHECK_NE(ptr_, begin_);
--ptr_;
DCHECK(*ptr_ != NULL);
return *ptr_;
}
bool IsEmpty() const {
- return ptr_ == base_;
+ return ptr_ == begin_;
}
private:
MarkStack() :
- base_(NULL), limit_(NULL), ptr_(NULL) {
+ begin_(NULL), limit_(NULL), ptr_(NULL) {
}
void Init();
@@ -47,7 +47,7 @@
UniquePtr<MemMap> mem_map_;
// Base of the mark stack.
- const Object* const* base_;
+ const Object* const* begin_;
// Exclusive limit of the mark stack.
const Object* const* limit_;
diff --git a/src/mark_sweep.cc b/src/mark_sweep.cc
index 9078340..cc1dcde 100644
--- a/src/mark_sweep.cc
+++ b/src/mark_sweep.cc
@@ -90,9 +90,9 @@
CardTable* card_table = Heap::GetCardTable();
for (size_t i = 0; i < spaces.size(); ++i) {
if (spaces[i]->IsImageSpace()) {
- byte* base = spaces[i]->GetBase();
- byte* limit = spaces[i]->GetLimit();
- card_table->Scan(base, limit, ScanImageRootVisitor, this);
+ byte* begin = spaces[i]->Begin();
+ byte* end = spaces[i]->End();
+ card_table->Scan(begin, end, ScanImageRootVisitor, this);
}
}
}
@@ -124,18 +124,18 @@
const std::vector<Space*>& spaces = Heap::GetSpaces();
for (size_t i = 0; i < spaces.size(); ++i) {
#ifndef NDEBUG
- uintptr_t base = reinterpret_cast<uintptr_t>(spaces[i]->GetBase());
- uintptr_t limit = reinterpret_cast<uintptr_t>(spaces[i]->GetLimit());
+ uintptr_t begin = reinterpret_cast<uintptr_t>(spaces[i]->Begin());
+ uintptr_t end = reinterpret_cast<uintptr_t>(spaces[i]->End());
if (!spaces[i]->IsImageSpace()) {
- mark_bitmap_->ScanWalk(base, limit, &MarkSweep::ScanBitmapCallback, arg);
+ mark_bitmap_->ScanWalk(begin, end, &MarkSweep::ScanBitmapCallback, arg);
} else{
- mark_bitmap_->ScanWalk(base, limit, &MarkSweep::CheckBitmapCallback, arg);
+ mark_bitmap_->ScanWalk(begin, end, &MarkSweep::CheckBitmapCallback, arg);
}
#else
if (!spaces[i]->IsImageSpace()) {
- uintptr_t base = reinterpret_cast<uintptr_t>(spaces[i]->GetBase());
- uintptr_t limit = reinterpret_cast<uintptr_t>(spaces[i]->GetLimit());
- mark_bitmap_->ScanWalk(base, limit, &MarkSweep::ScanBitmapCallback, arg);
+ uintptr_t begin = reinterpret_cast<uintptr_t>(spaces[i]->Begin());
+ uintptr_t end = reinterpret_cast<uintptr_t>(spaces[i]->End());
+ mark_bitmap_->ScanWalk(begin, end, &MarkSweep::ScanBitmapCallback, arg);
}
#endif
}
@@ -167,27 +167,30 @@
SweepJniWeakGlobals();
}
-void MarkSweep::SweepCallback(size_t num_ptrs, void** ptrs, void* arg) {
+void MarkSweep::SweepCallback(size_t num_ptrs, Object** ptrs, void* arg) {
// TODO: lock heap if concurrent
size_t freed_objects = num_ptrs;
size_t freed_bytes = 0;
- Space* space = static_cast<Space*>(arg);
+ AllocSpace* space = static_cast<AllocSpace*>(arg);
// Use a bulk free, that merges consecutive objects before freeing or free per object?
// Documentation suggests better free performance with merging, but this may be at the expensive
// of allocation.
// TODO: investigate performance
- static const bool kFreeUsingMerge = true;
- if (kFreeUsingMerge) {
- freed_bytes = space->FreeList(num_ptrs, ptrs);
+ static const bool kUseFreeList = true;
+ if (kUseFreeList) {
for (size_t i = 0; i < num_ptrs; ++i) {
Object* obj = static_cast<Object*>(ptrs[i]);
+ freed_bytes += space->AllocationSize(obj);
Heap::GetLiveBits()->Clear(obj);
}
+ // AllocSpace::FreeList clears the value in ptrs, so perform after clearing the live bit
+ space->FreeList(num_ptrs, ptrs);
} else {
for (size_t i = 0; i < num_ptrs; ++i) {
Object* obj = static_cast<Object*>(ptrs[i]);
+ freed_bytes += space->AllocationSize(obj);
Heap::GetLiveBits()->Clear(obj);
- freed_bytes += space->Free(obj);
+ space->Free(obj);
}
}
Heap::RecordFreeLocked(freed_objects, freed_bytes);
@@ -200,10 +203,10 @@
const std::vector<Space*>& spaces = Heap::GetSpaces();
for (size_t i = 0; i < spaces.size(); ++i) {
if (!spaces[i]->IsImageSpace()) {
- uintptr_t base = reinterpret_cast<uintptr_t>(spaces[i]->GetBase());
- uintptr_t limit = reinterpret_cast<uintptr_t>(spaces[i]->GetLimit());
+ uintptr_t begin = reinterpret_cast<uintptr_t>(spaces[i]->Begin());
+ uintptr_t end = reinterpret_cast<uintptr_t>(spaces[i]->End());
void* arg = static_cast<void*>(spaces[i]);
- HeapBitmap::SweepWalk(*live_bitmap_, *mark_bitmap_, base, limit,
+ HeapBitmap::SweepWalk(*live_bitmap_, *mark_bitmap_, begin, end,
&MarkSweep::SweepCallback, arg);
}
}
@@ -266,14 +269,15 @@
}
inline void MarkSweep::CheckReference(const Object* obj, const Object* ref, MemberOffset offset, bool is_static) {
- Space* alloc_space = Heap::GetAllocSpace();
+ AllocSpace* alloc_space = Heap::GetAllocSpace();
if (alloc_space->Contains(ref)) {
bool is_marked = mark_bitmap_->Test(ref);
if(!is_marked) {
- LOG(INFO) << StringPrintf("Alloc space %p-%p (%s)", alloc_space->GetBase(), alloc_space->GetLimit(), alloc_space->GetName().c_str());
- LOG(WARNING) << (is_static ? "Static ref'" : "Instance ref'") << PrettyTypeOf(ref) << "' (" << (void*)ref
- << ") in '" << PrettyTypeOf(obj) << "' (" << (void*)obj << ") at offset "
- << (void*)offset.Int32Value() << " wasn't marked";
+ LOG(INFO) << *alloc_space;
+ LOG(WARNING) << (is_static ? "Static ref'" : "Instance ref'") << PrettyTypeOf(ref)
+ << "' (" << (void*)ref << ") in '" << PrettyTypeOf(obj)
+ << "' (" << (void*)obj << ") at offset "
+ << (void*)offset.Int32Value() << " wasn't marked";
bool obj_marked = Heap::GetCardTable()->IsDirty(obj);
if (!obj_marked) {
LOG(WARNING) << "Object '" << PrettyTypeOf(obj) << "' (" << (void*)obj
diff --git a/src/mark_sweep.h b/src/mark_sweep.h
index c517246..3b72d1a 100644
--- a/src/mark_sweep.h
+++ b/src/mark_sweep.h
@@ -85,7 +85,7 @@
static void CheckBitmapCallback(Object* obj, void* finger, void* arg);
- static void SweepCallback(size_t num_ptrs, void** ptrs, void* arg);
+ static void SweepCallback(size_t num_ptrs, Object** ptrs, void* arg);
void CheckReference(const Object* obj, const Object* ref, MemberOffset offset, bool is_static);
diff --git a/src/mem_map.cc b/src/mem_map.cc
index 673098d..92c6a59 100644
--- a/src/mem_map.cc
+++ b/src/mem_map.cc
@@ -156,23 +156,21 @@
}
MemMap::~MemMap() {
- if (base_addr_ == NULL && base_length_ == 0) {
+ if (base_begin_ == NULL && base_size_ == 0) {
return;
}
- int result = munmap(base_addr_, base_length_);
- base_addr_ = NULL;
- base_length_ = 0;
+ int result = munmap(base_begin_, base_size_);
if (result == -1) {
PLOG(FATAL) << "munmap failed";
}
}
-MemMap::MemMap(byte* addr, size_t length, void* base_addr, size_t base_length)
- : addr_(addr), length_(length), base_addr_(base_addr), base_length_(base_length) {
- CHECK(addr_ != NULL);
- CHECK_NE(length_, 0U);
- CHECK(base_addr_ != NULL);
- CHECK_NE(base_length_, 0U);
+MemMap::MemMap(byte* begin, size_t size, void* base_begin, size_t base_size)
+ : begin_(begin), size_(size), base_begin_(base_begin), base_size_(base_size) {
+ CHECK(begin_ != NULL);
+ CHECK_NE(size_, 0U);
+ CHECK(base_begin_ != NULL);
+ CHECK_NE(base_size_, 0U);
};
} // namespace art
diff --git a/src/mem_map.h b/src/mem_map.h
index 43e1cfd..ce2f4fa 100644
--- a/src/mem_map.h
+++ b/src/mem_map.h
@@ -57,26 +57,26 @@
// Releases the memory mapping
~MemMap();
- byte* GetAddress() const {
- return addr_;
+ byte* Begin() const {
+ return begin_;
}
- size_t GetLength() const {
- return length_;
+ size_t Size() const {
+ return size_;
}
- byte* GetLimit() const {
- return addr_ + length_;
+ byte* End() const {
+ return begin_ + size_;
}
private:
- MemMap(byte* addr, size_t length, void* base_addr, size_t base_length);
+ MemMap(byte* begin, size_t size, void* base_begin, size_t base_size);
- byte* addr_; // start of data
- size_t length_; // length of data
+ byte* const begin_; // start of data
+ const size_t size_; // length of data
- void* base_addr_; // page-aligned base address
- size_t base_length_; // length of mapping
+ void* const base_begin_; // page-aligned base address
+ const size_t base_size_; // length of mapping
};
} // namespace art
diff --git a/src/mspace.c b/src/mspace.c
deleted file mode 100644
index a4263d5..0000000
--- a/src/mspace.c
+++ /dev/null
@@ -1,231 +0,0 @@
-/* Copyright 2006 The Android Open Source Project */
-
-/* A wrapper file for dlmalloc.c that compiles in the
- * mspace_*() functions, which provide an interface for
- * creating multiple heaps.
- */
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdint.h>
-#include <sys/ioctl.h>
-
-/* It's a pain getting the mallinfo stuff to work
- * with Linux, OSX, and klibc, so just turn it off
- * for now.
- * TODO: make mallinfo work
- */
-#define NO_MALLINFO 1
-
-/* Allow setting the maximum heap footprint.
- */
-#define USE_MAX_ALLOWED_FOOTPRINT 1
-
-/* Don't try to trim memory.
- * TODO: support this.
- */
-#define MORECORE_CANNOT_TRIM 1
-
-/* Use mmap()d anonymous memory to guarantee
- * that an mspace is contiguous.
- *
- * create_mspace() won't work right if this is
- * defined, so hide the definition of it and
- * break any users at build time.
- */
-#define USE_CONTIGUOUS_MSPACES 1
-#if USE_CONTIGUOUS_MSPACES
-/* This combination of settings forces sys_alloc()
- * to always use MORECORE(). It won't expect the
- * results to be contiguous, but we'll guarantee
- * that they are.
- */
-#define HAVE_MMAP 0
-#define HAVE_MORECORE 1
-#define MORECORE_CONTIGUOUS 0
-/* m is always the appropriate local when MORECORE() is called. */
-#define MORECORE(S) contiguous_mspace_morecore(m, S)
-#define create_mspace HIDDEN_create_mspace_HIDDEN
-#define destroy_mspace HIDDEN_destroy_mspace_HIDDEN
-typedef struct malloc_state *mstate0;
-static void *contiguous_mspace_morecore(mstate0 m, ssize_t nb);
-#endif /* USE_CONTIGUOUS_MSPACES */
-
-#define MSPACES 1
-#define ONLY_MSPACES 1
-#include "dlmalloc.c"
-
-#ifndef PAGESIZE
-#define PAGESIZE mparams.page_size
-#endif
-
-#define ALIGN_UP(p, alignment) \
- (((uintptr_t)(p) + (alignment)-1) & ~((alignment)-1))
-
-/* A direct copy of dlmalloc_usable_size(),
- * which isn't compiled in when ONLY_MSPACES is set.
- * The mspace parameter isn't actually necessary,
- * but we include it to be consistent with the
- * rest of the mspace_*() functions.
- */
-size_t mspace_usable_size(mspace _unused, const void* mem) {
- if (mem != 0) {
- const mchunkptr p = mem2chunk(mem);
- if (cinuse(p))
- return chunksize(p) - overhead_for(p);
- }
- return 0;
-}
-
-#if USE_CONTIGUOUS_MSPACES
-#include <sys/mman.h>
-#include <limits.h>
-
-#define CONTIG_STATE_MAGIC 0xf00dd00d
-struct mspace_contig_state {
- unsigned int magic;
- char *brk;
- char *top;
- mspace m;
-};
-
-static void *contiguous_mspace_morecore(mstate m, ssize_t nb) {
- struct mspace_contig_state *cs;
- char *oldbrk;
- const unsigned int pagesize = PAGESIZE;
-
- cs = (struct mspace_contig_state *)((uintptr_t)m & ~(pagesize-1));
- assert(cs->magic == CONTIG_STATE_MAGIC);
- assert(cs->m == m);
-assert(nb >= 0); //xxx deal with the trim case
-
- oldbrk = cs->brk;
- if (nb > 0) {
- /* Break to the first page boundary that satisfies the request.
- */
- char *newbrk = (char *)ALIGN_UP(oldbrk + nb, pagesize);
- if (newbrk > cs->top)
- return CMFAIL;
-
- /* Update the protection on the underlying memory.
- * Pages we've given to dlmalloc are read/write, and
- * pages we haven't are not accessable (read or write
- * will cause a seg fault).
- */
- if (mprotect(cs, newbrk - (char *)cs, PROT_READ | PROT_WRITE) < 0)
- return CMFAIL;
- if (newbrk != cs->top) {
- if (mprotect(newbrk, cs->top - newbrk, PROT_NONE) < 0)
- return CMFAIL;
- }
-
- cs->brk = newbrk;
-
- /* Make sure that dlmalloc will merge this block with the
- * initial block that was passed to create_mspace_with_base().
- * We don't care about extern vs. non-extern, so just clear it.
- */
- m->seg.sflags &= ~EXTERN_BIT;
- }
-
- return oldbrk;
-}
-
-mspace create_contiguous_mspace_with_base(size_t starting_capacity,
- size_t max_capacity, int locked, void *base) {
- struct mspace_contig_state *cs;
- unsigned int pagesize;
- mstate m;
-
- init_mparams();
- pagesize = PAGESIZE;
- assert(starting_capacity <= max_capacity);
- assert(((uintptr_t)base & (pagesize-1)) == 0);
- assert(((uintptr_t)max_capacity & (pagesize-1)) == 0);
- starting_capacity = (size_t)ALIGN_UP(starting_capacity, pagesize);
-
- /* Make the first page read/write. dlmalloc needs to use that page.
- */
- if (mprotect(base, starting_capacity, PROT_READ | PROT_WRITE) < 0) {
- goto error;
- }
-
- /* Create the mspace, pointing to the memory given.
- */
- m = create_mspace_with_base((char *)base + sizeof(*cs), starting_capacity,
- locked);
- if (m == (mspace)0) {
- goto error;
- }
- /* Make sure that m is in the same page as base.
- */
- assert(((uintptr_t)m & (uintptr_t)~(pagesize-1)) == (uintptr_t)base);
- /* Use some space for the information that our MORECORE needs.
- */
- cs = (struct mspace_contig_state *)base;
-
- /* Find out exactly how much of the memory the mspace
- * is using.
- */
- cs->brk = m->seg.base + m->seg.size;
- cs->top = (char *)base + max_capacity;
-
- assert((char *)base <= cs->brk);
- assert(cs->brk <= cs->top);
- /* Prevent access to the memory we haven't handed out yet.
- */
- if (cs->brk != cs->top) {
- /* mprotect() requires page-aligned arguments, but it's possible
- * for cs->brk not to be page-aligned at this point.
- */
- char *prot_brk = (char *)ALIGN_UP(cs->brk, pagesize);
- if ((mprotect(base, prot_brk - (char *)base, PROT_READ | PROT_WRITE) < 0) ||
- (mprotect(prot_brk, cs->top - prot_brk, PROT_NONE) < 0)) {
- goto error;
- }
- }
-
- cs->m = m;
- cs->magic = CONTIG_STATE_MAGIC;
-
- return (mspace)m;
-
-error:
- return (mspace)0;
-}
-
-size_t destroy_contiguous_mspace(mspace msp) {
- mstate ms = (mstate)msp;
-
- if (ok_magic(ms)) {
- struct mspace_contig_state *cs;
- size_t length;
- const unsigned int pagesize = PAGESIZE;
-
- cs = (struct mspace_contig_state *)((uintptr_t)ms & ~(pagesize-1));
- assert(cs->magic == CONTIG_STATE_MAGIC);
- assert(cs->m == ms);
-
- length = cs->top - (char *)cs;
- if (munmap((char *)cs, length) != 0)
- return length;
- }
- else {
- USAGE_ERROR_ACTION(ms, ms);
- }
- return 0;
-}
-
-void *contiguous_mspace_sbrk0(mspace msp) {
- struct mspace_contig_state *cs;
- mstate ms;
- const unsigned int pagesize = PAGESIZE;
-
- ms = (mstate)msp;
- cs = (struct mspace_contig_state *)((uintptr_t)ms & ~(pagesize-1));
- assert(cs->magic == CONTIG_STATE_MAGIC);
- assert(cs->m == ms);
- return cs->brk;
-}
-#endif /* USE_CONTIGUOUS_MSPACES */
diff --git a/src/mspace.h b/src/mspace.h
deleted file mode 100644
index b22d9a4..0000000
--- a/src/mspace.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Copyright (C) 2006 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/* A wrapper file for dlmalloc.h that defines prototypes for the
- * mspace_*() functions, which provide an interface for creating
- * multiple heaps.
- */
-
-#ifndef MSPACE_H_
-#define MSPACE_H_
-
-/* It's a pain getting the mallinfo stuff to work
- * with Linux, OSX, and klibc, so just turn it off
- * for now.
- * TODO: make mallinfo work
- */
-#define NO_MALLINFO 1
-
-/* Allow setting the maximum heap footprint.
- */
-#define USE_MAX_ALLOWED_FOOTPRINT 1
-
-#define USE_CONTIGUOUS_MSPACES 1
-#if USE_CONTIGUOUS_MSPACES
-#define HAVE_MMAP 0
-#define HAVE_MORECORE 1
-#define MORECORE_CONTIGUOUS 0
-#endif
-
-#define MSPACES 1
-#define ONLY_MSPACES 1
-#include "dlmalloc.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/*
- mspace_usable_size(void* p);
-
- Returns the number of bytes you can actually use in
- an allocated chunk, which may be more than you requested (although
- often not) due to alignment and minimum size constraints.
- You can use this many bytes without worrying about
- overwriting other allocated objects. This is not a particularly great
- programming practice. mspace_usable_size can be more useful in
- debugging and assertions, for example:
-
- p = mspace_malloc(msp, n);
- assert(mspace_usable_size(msp, p) >= 256);
-*/
-size_t mspace_usable_size(mspace, const void*);
-
-#if USE_CONTIGUOUS_MSPACES
-/*
- Similar to create_mspace(), but the underlying memory is
- guaranteed to be contiguous. No more than max_capacity
- bytes is ever allocated to the mspace.
- */
-mspace create_contiguous_mspace(size_t starting_capacity, size_t max_capacity,
- int locked);
-
-/*
- Identical to create_contiguous_mspace, but labels the mapping 'mspace/name'
- instead of 'mspace'
-*/
-mspace create_contiguous_mspace_with_name(size_t starting_capacity,
- size_t max_capacity, int locked, const char *name);
-
-/*
- Identical to create_contiguous_mspace, but uses previously mapped memory.
-*/
-mspace create_contiguous_mspace_with_base(size_t starting_capacity,
- size_t max_capacity, int locked, void *base);
-
-size_t destroy_contiguous_mspace(mspace msp);
-
-/*
- Returns the position of the "break" within the given mspace.
-*/
-void *contiguous_mspace_sbrk0(mspace msp);
-#endif
-
-/*
- Call the handler for each block in the specified mspace.
- chunkptr and chunklen refer to the heap-level chunk including
- the chunk overhead, and userptr and userlen refer to the
- user-usable part of the chunk. If the chunk is free, userptr
- will be NULL and userlen will be 0. userlen is not guaranteed
- to be the same value passed into malloc() for a given chunk;
- it is >= the requested size.
- */
-void mspace_walk_heap(mspace msp,
- void(*handler)(const void *chunkptr, size_t chunklen,
- const void *userptr, size_t userlen, void *arg), void *harg);
-
-/*
- mspace_walk_free_pages(handler, harg)
-
- Calls the provided handler on each free region in the specified
- mspace. The memory between start and end are guaranteed not to
- contain any important data, so the handler is free to alter the
- contents in any way. This can be used to advise the OS that large
- free regions may be swapped out.
-
- The value in harg will be passed to each call of the handler.
- */
-void mspace_walk_free_pages(mspace msp,
- void(*handler)(void *start, void *end, void *arg), void *harg);
-
-#ifdef __cplusplus
-}; /* end of extern "C" */
-#endif
-
-#endif /* MSPACE_H_ */
diff --git a/src/oat_file.cc b/src/oat_file.cc
index 7cc42ab..168f0e3 100644
--- a/src/oat_file.cc
+++ b/src/oat_file.cc
@@ -65,13 +65,13 @@
LOG(WARNING) << "Failed to map oat file " << filename;
return false;
}
- CHECK(requested_base == 0 || requested_base == map->GetAddress())
- << filename << " " << reinterpret_cast<void*>(map->GetAddress());
- DCHECK_EQ(0, memcmp(&oat_header, map->GetAddress(), sizeof(OatHeader))) << filename;
+ CHECK(requested_base == 0 || requested_base == map->Begin())
+ << filename << " " << reinterpret_cast<void*>(map->Begin());
+ DCHECK_EQ(0, memcmp(&oat_header, map->Begin(), sizeof(OatHeader))) << filename;
off_t code_offset = oat_header.GetExecutableOffset();
if (code_offset < file->Length()) {
- byte* code_address = map->GetAddress() + code_offset;
+ byte* code_address = map->Begin() + code_offset;
size_t code_length = file->Length() - code_offset;
if (mprotect(code_address, code_length, PROT_READ | PROT_EXEC) != 0) {
PLOG(ERROR) << "Failed to make oat code executable in " << filename;
@@ -82,40 +82,40 @@
DCHECK_EQ(code_offset, RoundUp(file->Length(), kPageSize)) << filename;
}
- const byte* oat = map->GetAddress();
+ const byte* oat = map->Begin();
oat += sizeof(OatHeader);
- CHECK_LE(oat, map->GetLimit()) << filename;
+ CHECK_LE(oat, map->End()) << filename;
for (size_t i = 0; i < oat_header.GetDexFileCount(); i++) {
size_t dex_file_location_size = *reinterpret_cast<const uint32_t*>(oat);
CHECK_GT(dex_file_location_size, 0U) << filename;
oat += sizeof(dex_file_location_size);
- CHECK_LT(oat, map->GetLimit()) << filename;
+ CHECK_LT(oat, map->End()) << filename;
const char* dex_file_location_data = reinterpret_cast<const char*>(oat);
oat += dex_file_location_size;
- CHECK_LT(oat, map->GetLimit()) << filename;
+ CHECK_LT(oat, map->End()) << filename;
std::string dex_file_location(dex_file_location_data, dex_file_location_size);
uint32_t dex_file_checksum = *reinterpret_cast<const uint32_t*>(oat);
oat += sizeof(dex_file_checksum);
- CHECK_LT(oat, map->GetLimit()) << filename;
+ CHECK_LT(oat, map->End()) << filename;
uint32_t dex_file_offset = *reinterpret_cast<const uint32_t*>(oat);
CHECK_GT(dex_file_offset, 0U) << filename;
CHECK_LT(dex_file_offset, static_cast<uint32_t>(file->Length())) << filename;
oat += sizeof(dex_file_offset);
- CHECK_LT(oat, map->GetLimit()) << filename;
+ CHECK_LT(oat, map->End()) << filename;
- uint8_t* dex_file_pointer = map->GetAddress() + dex_file_offset;
+ uint8_t* dex_file_pointer = map->Begin() + dex_file_offset;
CHECK(DexFile::IsMagicValid(dex_file_pointer)) << filename << " " << dex_file_pointer;
CHECK(DexFile::IsVersionValid(dex_file_pointer)) << filename << " " << dex_file_pointer;
const DexFile::Header* header = reinterpret_cast<const DexFile::Header*>(dex_file_pointer);
const uint32_t* methods_offsets_pointer = reinterpret_cast<const uint32_t*>(oat);
oat += (sizeof(*methods_offsets_pointer) * header->class_defs_size_);
- CHECK_LE(oat, map->GetLimit()) << filename;
+ CHECK_LE(oat, map->End()) << filename;
oat_dex_files_[dex_file_location] = new OatDexFile(this,
dex_file_location,
@@ -129,17 +129,17 @@
}
const OatHeader& OatFile::GetOatHeader() const {
- return *reinterpret_cast<const OatHeader*>(GetBase());
+ return *reinterpret_cast<const OatHeader*>(Begin());
}
-const byte* OatFile::GetBase() const {
- CHECK(mem_map_->GetAddress() != NULL);
- return mem_map_->GetAddress();
+const byte* OatFile::Begin() const {
+ CHECK(mem_map_->Begin() != NULL);
+ return mem_map_->Begin();
}
-const byte* OatFile::GetLimit() const {
- CHECK(mem_map_->GetLimit() != NULL);
- return mem_map_->GetLimit();
+const byte* OatFile::End() const {
+ CHECK(mem_map_->End() != NULL);
+ return mem_map_->End();
}
const OatFile::OatDexFile* OatFile::GetOatDexFile(const std::string& dex_file_location,
@@ -183,12 +183,12 @@
const OatFile::OatClass* OatFile::OatDexFile::GetOatClass(uint32_t class_def_index) const {
uint32_t oat_class_offset = oat_class_offsets_pointer_[class_def_index];
- const byte* oat_class_pointer = oat_file_->GetBase() + oat_class_offset;
- CHECK_LT(oat_class_pointer, oat_file_->GetLimit());
+ const byte* oat_class_pointer = oat_file_->Begin() + oat_class_offset;
+ CHECK_LT(oat_class_pointer, oat_file_->End());
Class::Status status = *reinterpret_cast<const Class::Status*>(oat_class_pointer);
const byte* methods_pointer = oat_class_pointer + sizeof(status);
- CHECK_LT(methods_pointer, oat_file_->GetLimit());
+ CHECK_LT(methods_pointer, oat_file_->End());
return new OatClass(oat_file_,
status,
@@ -209,7 +209,7 @@
const OatFile::OatMethod OatFile::OatClass::GetOatMethod(uint32_t method_index) const {
const OatMethodOffsets& oat_method_offsets = methods_pointer_[method_index];
return OatMethod(
- oat_file_->GetBase(),
+ oat_file_->Begin(),
oat_method_offsets.code_offset_,
oat_method_offsets.frame_size_in_bytes_,
oat_method_offsets.core_spill_mask_,
@@ -229,7 +229,7 @@
const uint32_t vmap_table_offset,
const uint32_t gc_map_offset,
const uint32_t invoke_stub_offset)
- : base_(base),
+ : begin_(base),
code_offset_(code_offset),
frame_size_in_bytes_(frame_size_in_bytes),
core_spill_mask_(core_spill_mask),
@@ -243,7 +243,7 @@
if (vmap_table_offset_ == 0) {
DCHECK_EQ(0U, static_cast<uint32_t>(__builtin_popcount(core_spill_mask_) + __builtin_popcount(fp_spill_mask_)));
} else {
- const uint16_t* vmap_table_ = reinterpret_cast<const uint16_t*>(base_ + vmap_table_offset_);
+ const uint16_t* vmap_table_ = reinterpret_cast<const uint16_t*>(begin_ + vmap_table_offset_);
DCHECK_EQ(vmap_table_[0], static_cast<uint32_t>(__builtin_popcount(core_spill_mask_) + __builtin_popcount(fp_spill_mask_)));
}
} else {
diff --git a/src/oat_file.h b/src/oat_file.h
index 07e235b..8415140 100644
--- a/src/oat_file.h
+++ b/src/oat_file.h
@@ -103,10 +103,10 @@
if (offset == 0) {
return NULL;
}
- return reinterpret_cast<T>(base_ + offset);
+ return reinterpret_cast<T>(begin_ + offset);
}
- const byte* base_;
+ const byte* begin_;
uint32_t code_offset_;
size_t frame_size_in_bytes_;
@@ -178,16 +178,16 @@
bool warn_if_not_found = true) const;
std::vector<const OatDexFile*> GetOatDexFiles() const;
- size_t GetSize() const {
- return GetLimit() - GetBase();
+ size_t Size() const {
+ return End() - Begin();
}
private:
explicit OatFile(const std::string& filename);
bool Read(const std::string& filename, byte* requested_base);
- const byte* GetBase() const;
- const byte* GetLimit() const;
+ const byte* Begin() const;
+ const byte* End() const;
// The oat file name.
//
diff --git a/src/oatdump.cc b/src/oatdump.cc
index be02d4d..bf9962c 100644
--- a/src/oatdump.cc
+++ b/src/oatdump.cc
@@ -84,11 +84,11 @@
os << "EXECUTABLE OFFSET:\n";
os << StringPrintf("%08x\n\n", oat_header.GetExecutableOffset());
- os << "BASE:\n";
- os << reinterpret_cast<const void*>(oat_file.GetBase()) << "\n\n";
+ os << "BEGIN:\n";
+ os << reinterpret_cast<const void*>(oat_file.Begin()) << "\n\n";
- os << "LIMIT:\n";
- os << reinterpret_cast<const void*>(oat_file.GetLimit()) << "\n\n";
+ os << "END:\n";
+ os << reinterpret_cast<const void*>(oat_file.End()) << "\n\n";
os << std::flush;
@@ -207,17 +207,17 @@
os << "MAGIC:\n";
os << image_header.GetMagic() << "\n\n";
- os << "IMAGE BASE:\n";
- os << reinterpret_cast<void*>(image_header.GetImageBaseAddr()) << "\n\n";
+ os << "IMAGE BEGIN:\n";
+ os << reinterpret_cast<void*>(image_header.GetImageBegin()) << "\n\n";
os << "OAT CHECKSUM:\n";
os << StringPrintf("%08x\n\n", image_header.GetOatChecksum());
- os << "OAT BASE:\n";
- os << reinterpret_cast<void*>(image_header.GetOatBaseAddr()) << "\n\n";
+ os << "OAT BEGIN:\n";
+ os << reinterpret_cast<void*>(image_header.GetOatBegin()) << "\n\n";
- os << "OAT LIMIT:\n";
- os << reinterpret_cast<void*>(image_header.GetOatLimitAddr()) << "\n\n";
+ os << "OAT END:\n";
+ os << reinterpret_cast<void*>(image_header.GetOatEnd()) << "\n\n";
os << "ROOTS:\n";
os << reinterpret_cast<void*>(image_header.GetImageRoots()) << "\n";
@@ -381,8 +381,7 @@
}
bool InDumpSpace(const Object* object) {
- const byte* o = reinterpret_cast<const byte*>(object);
- return (o >= dump_space_.GetBase() && o < dump_space_.GetLimit());
+ return dump_space_.Contains(object);
}
public:
@@ -584,7 +583,7 @@
return EXIT_FAILURE;
}
- Space* image_space = Heap::GetSpaces()[Heap::GetSpaces().size()-2];
+ ImageSpace* image_space = Heap::GetSpaces()[Heap::GetSpaces().size()-2]->AsImageSpace();
CHECK(image_space != NULL);
const ImageHeader& image_header = image_space->GetImageHeader();
if (!image_header.IsValid()) {
diff --git a/src/object.h b/src/object.h
index 7d8b768..58c36be 100644
--- a/src/object.h
+++ b/src/object.h
@@ -350,8 +350,8 @@
}
template<typename T>
- void SetFieldPtr(MemberOffset field_offset, T new_value, bool is_volatile) {
- SetField32(field_offset, reinterpret_cast<uint32_t>(new_value), is_volatile);
+ void SetFieldPtr(MemberOffset field_offset, T new_value, bool is_volatile, bool this_is_valid = true) {
+ SetField32(field_offset, reinterpret_cast<uint32_t>(new_value), is_volatile, this_is_valid);
}
private:
diff --git a/src/runtime.cc b/src/runtime.cc
index fcbcc08..c70ca77 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -577,8 +577,8 @@
intern_table_ = new InternTable;
Heap::Init(options->heap_initial_size_,
- options->heap_maximum_size_,
options->heap_growth_limit_,
+ options->heap_maximum_size_,
options->images_);
BlockSignals();
diff --git a/src/signal_catcher.cc b/src/signal_catcher.cc
index 80563e2..4230834 100644
--- a/src/signal_catcher.cc
+++ b/src/signal_catcher.cc
@@ -131,7 +131,7 @@
void SignalCatcher::HandleSigUsr1() {
LOG(INFO) << "SIGUSR1 forcing GC (no HPROF)";
- Heap::CollectGarbage();
+ Heap::CollectGarbage(false);
}
int SignalCatcher::WaitForSignal(sigset_t& mask) {
diff --git a/src/space.cc b/src/space.cc
index 053d2df..5cdeeeb 100644
--- a/src/space.cc
+++ b/src/space.cc
@@ -5,6 +5,7 @@
#include <sys/mman.h>
#include "UniquePtr.h"
+#include "dlmalloc.h"
#include "file.h"
#include "image.h"
#include "logging.h"
@@ -13,108 +14,263 @@
namespace art {
-Space* Space::Create(const std::string& name, size_t initial_size, size_t maximum_size, size_t growth_size, byte* requested_base) {
- UniquePtr<Space> space(new Space(name));
- bool success = space->Init(initial_size, maximum_size, growth_size, requested_base);
- if (!success) {
- return NULL;
- } else {
- return space.release();
+#ifndef NDEBUG
+#define DEBUG_SPACES 1
+#endif
+
+#define CHECK_MEMORY_CALL(call, args, what) \
+ do { \
+ int rc = call args; \
+ if (UNLIKELY(rc != 0)) { \
+ errno = rc; \
+ PLOG(FATAL) << # call << " failed for " << what; \
+ } \
+ } while (false)
+
+AllocSpace* Space::CreateAllocSpace(const std::string& name, size_t initial_size,
+ size_t growth_limit, size_t capacity,
+ byte* requested_begin) {
+ uint64_t start_time = 0;
+ if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
+ start_time = NanoTime();
+ VLOG(startup) << "Space::CreateAllocSpace entering " << name
+ << " initial_size=" << (initial_size / KB) << "KiB"
+ << " growth_limit=" << (growth_limit / KB) << "KiB"
+ << " capacity=" << (capacity / KB) << "KiB"
+ << " requested_begin=" << reinterpret_cast<void*>(requested_begin);
}
+
+ // Sanity check arguments
+ if (initial_size > growth_limit) {
+ LOG(ERROR) << "Failed to create alloc space (" << name << ") where the initial size ("
+ << initial_size << ") is larger than its capacity (" << growth_limit << ")";
+ return NULL;
+ }
+ if (growth_limit > capacity) {
+ LOG(ERROR) << "Failed to create alloc space (" << name << ") where the growth limit capacity"
+ " (" << growth_limit << ") is larger than the capacity (" << capacity << ")";
+ return NULL;
+ }
+
+ // Page align growth limit and capacity which will be used to manage mmapped storage
+ growth_limit = RoundUp(growth_limit, kPageSize);
+ capacity = RoundUp(capacity, kPageSize);
+
+ UniquePtr<MemMap> mem_map(MemMap::MapAnonymous(name.c_str(), requested_begin,
+ capacity, PROT_READ | PROT_WRITE));
+ if (mem_map.get() == NULL) {
+ LOG(ERROR) << "Failed to allocate pages for alloc space (" << name << ") of size "
+ << capacity << " bytes";
+ return NULL;
+ }
+
+ void* mspace = AllocSpace::CreateMallocSpace(mem_map->Begin(), initial_size, capacity);
+ if (mspace == NULL) {
+ LOG(ERROR) << "Failed to initialize mspace for alloc space (" << name << ")";
+ return NULL;
+ }
+
+ // Protect memory beyond the initial size
+ byte* end = mem_map->Begin() + initial_size;
+ if (capacity - initial_size > 0) {
+ CHECK_MEMORY_CALL(mprotect, (end, capacity - initial_size, PROT_NONE), name);
+ }
+
+ // Everything is set so record in immutable structure and leave
+ AllocSpace* space = new AllocSpace(name, mem_map.release(), mspace, end, growth_limit);
+ if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
+ uint64_t duration_ms = (NanoTime() - start_time)/1000/1000;
+ LOG(INFO) << "Space::CreateAllocSpace exiting (" << duration_ms << " ms) " << *space;
+ }
+ return space;
}
-Space* Space::CreateFromImage(const std::string& image_file_name) {
- CHECK(image_file_name != NULL);
- UniquePtr<Space> space(new Space(image_file_name));
- bool success = space->InitFromImage(image_file_name);
- if (!success) {
- return NULL;
- } else {
- return space.release();
- }
-}
-
-Space::~Space() {}
-
-void* Space::CreateMallocSpace(void* base,
- size_t initial_size,
- size_t maximum_size) {
+void* AllocSpace::CreateMallocSpace(void* begin, size_t size, size_t capacity) {
+ // clear errno to allow PLOG on error
errno = 0;
- bool is_locked = false;
- size_t commit_size = initial_size / 2;
- void* msp = create_contiguous_mspace_with_base(commit_size, maximum_size,
- is_locked, base);
+ // create mspace using our backing storage starting at begin and of half the specified size.
+ // Don't use an internal dlmalloc lock (as we already hold heap lock). When size is exhaused
+ // morecore will be called.
+ void* msp = create_mspace_with_base(begin, size, false /*locked*/);
if (msp != NULL) {
- // Do not permit the heap grow past the starting size without our
- // intervention.
- mspace_set_max_allowed_footprint(msp, initial_size);
+ // Do not allow morecore requests to succeed beyond the initial size of the heap
+ mspace_set_footprint_limit(msp, size);
} else {
- // There is no guarantee that errno has meaning when the call
- // fails, but it often does.
- PLOG(ERROR) << "create_contiguous_mspace_with_base failed";
+ PLOG(ERROR) << "create_mspace_with_base failed";
}
return msp;
}
-bool Space::Init(size_t initial_size, size_t maximum_size, size_t growth_size, byte* requested_base) {
- VLOG(startup) << "Space::Init entering " << name_
- << " initial_size=" << initial_size
- << " maximum_size=" << maximum_size
- << " growth_size=" << growth_size
- << " requested_base=" << reinterpret_cast<void*>(requested_base);
- if (initial_size > growth_size) {
- LOG(ERROR) << "Failed to create space with initial size > growth size ("
- << initial_size << ">" << growth_size << "): " << name_;
- return false;
+Object* AllocSpace::AllocWithoutGrowth(size_t num_bytes) {
+ Object* result = reinterpret_cast<Object*>(mspace_calloc(mspace_, 1, num_bytes));
+#if DEBUG_SPACES
+ if (result != NULL) {
+ CHECK(Contains(result)) << "Allocation (" << reinterpret_cast<void*>(result)
+ << ") not in bounds of heap " << *this;
}
- if (growth_size > maximum_size) {
- LOG(ERROR) << "Failed to create space with growth size > maximum size ("
- << growth_size << ">" << maximum_size << "): " << name_;
- return false;
- }
- size_t length = RoundUp(maximum_size, kPageSize);
- int prot = PROT_READ | PROT_WRITE;
- UniquePtr<MemMap> mem_map(MemMap::MapAnonymous(name_.c_str(), requested_base, length, prot));
- if (mem_map.get() == NULL) {
- LOG(WARNING) << "Failed to allocate " << length << " bytes for space: " << name_;
- return false;
- }
- InitFromMemMap(mem_map.release());
- maximum_size_ = maximum_size;
- size_t growth_length = RoundUp(growth_size, kPageSize);
- growth_size_ = growth_size;
- growth_limit_ = base_ + growth_length;
- mspace_ = CreateMallocSpace(base_, initial_size, maximum_size);
- if (mspace_ == NULL) {
- LOG(WARNING) << "Failed to create mspace for space: " << name_;
- return false;
- }
- VLOG(startup) << "Space::Init exiting";
- return true;
+#endif
+ return result;
}
-void Space::InitFromMemMap(MemMap* mem_map) {
- mem_map_.reset(mem_map);
- base_ = mem_map_->GetAddress();
- limit_ = base_ + mem_map->GetLength();
+Object* AllocSpace::AllocWithGrowth(size_t num_bytes) {
+ // Grow as much as possible within the mspace.
+ size_t max_allowed = Capacity();
+ mspace_set_footprint_limit(mspace_, max_allowed);
+ // Try the allocation.
+ void* ptr = AllocWithoutGrowth(num_bytes);
+ // Shrink back down as small as possible.
+ size_t footprint = mspace_footprint(mspace_);
+ mspace_set_footprint_limit(mspace_, footprint);
+ // Return the new allocation or NULL.
+ Object* result = reinterpret_cast<Object*>(ptr);
+ CHECK(result == NULL || Contains(result));
+ return result;
}
-bool Space::InitFromImage(const std::string& image_file_name) {
- Runtime* runtime = Runtime::Current();
- VLOG(startup) << "Space::InitFromImage entering"
- << " image_file_name=" << image_file_name;
+void AllocSpace::Free(Object* ptr) {
+#if DEBUG_SPACES
+ CHECK(ptr != NULL);
+ CHECK(Contains(ptr)) << "Free (" << ptr << ") not in bounds of heap " << *this;
+#endif
+ mspace_free(mspace_, ptr);
+}
+
+void AllocSpace::FreeList(size_t num_ptrs, Object** ptrs) {
+#if DEBUG_SPACES
+ CHECK(ptrs != NULL);
+ size_t num_broken_ptrs = 0;
+ for (size_t i = 0; i < num_ptrs; i++) {
+ if(!Contains(ptrs[i])) {
+ num_broken_ptrs++;
+ LOG(ERROR) << "FreeList[" << i << "] (" << ptrs[i] << ") not in bounds of heap " << *this;
+ }
+ }
+ CHECK_EQ(num_broken_ptrs, 0u);
+#endif
+ mspace_bulk_free(mspace_, reinterpret_cast<void**>(ptrs), num_ptrs);
+}
+
+// Callback from dlmalloc when it needs to increase the footprint
+extern "C" void* art_heap_morecore(void* mspace, intptr_t increment) {
+ AllocSpace* space = Heap::GetAllocSpace();
+ if (LIKELY(space->GetMspace() == mspace)) {
+ return space->MoreCore(increment);
+ } else {
+ // Exhaustively search alloc spaces
+ const std::vector<Space*>& spaces = Heap::GetSpaces();
+ for (size_t i = 0; i < spaces.size(); i++) {
+ if (spaces[i]->IsAllocSpace()) {
+ AllocSpace* space = spaces[i]->AsAllocSpace();
+ if (mspace == space->GetMspace()) {
+ return space->MoreCore(increment);
+ }
+ }
+ }
+ LOG(FATAL) << "Unexpected call to art_heap_morecore. mspace: " << mspace
+ << " increment: " << increment;
+ return NULL;
+ }
+}
+
+void* AllocSpace::MoreCore(intptr_t increment) {
+ byte* original_end = end_;
+ if (increment != 0) {
+ VLOG(heap) << "AllocSpace::MoreCore " << (increment/KB) << "KiB";
+ byte* new_end = original_end + increment;
+ if (increment > 0) {
+#if DEBUG_SPACES
+ // Should never be asked to increase the allocation beyond the capacity of the space. Enforced
+ // by mspace_set_footprint_limit.
+ CHECK_LE(new_end, Begin() + Capacity());
+#endif
+ CHECK_MEMORY_CALL(mprotect, (original_end, increment, PROT_READ | PROT_WRITE), GetSpaceName());
+ } else {
+#if DEBUG_SPACES
+ // Should never be asked for negative footprint (ie before begin)
+ CHECK_GT(original_end + increment, Begin());
+#endif
+ // Advise we don't need the pages and protect them
+ size_t size = -increment;
+ CHECK_MEMORY_CALL(madvise, (new_end, size, MADV_DONTNEED), GetSpaceName());
+ CHECK_MEMORY_CALL(mprotect, (new_end, size, PROT_NONE), GetSpaceName());
+ }
+ // Update end_
+ end_ = new_end;
+ }
+ return original_end;
+}
+
+size_t AllocSpace::AllocationSize(const Object* obj) {
+ return mspace_usable_size(const_cast<void*>(reinterpret_cast<const void*>(obj))) + kChunkOverhead;
+}
+
+// Call back from mspace_inspect_all returning the start and end of chunks and the bytes used,
+// if used_bytes is 0 then it indicates the range isn't in use and we madvise to the system that
+// we don't need it
+static void DontNeed(void* start, void* end, size_t used_bytes, void* num_bytes) {
+ if (used_bytes == 0) {
+ start = reinterpret_cast<void*>(RoundUp((uintptr_t)start, kPageSize));
+ end = reinterpret_cast<void*>(RoundDown((uintptr_t)end, kPageSize));
+ if (end > start) {
+ // We have a page aligned region to madvise on
+ size_t length = reinterpret_cast<byte*>(end) - reinterpret_cast<byte*>(start);
+ CHECK_MEMORY_CALL(madvise, (start, length, MADV_DONTNEED), "trim");
+ }
+ }
+}
+
+void AllocSpace::Trim() {
+ // Trim to release memory at the end of the space
+ mspace_trim(mspace_, 0);
+ // Visit space looking for page size holes to advise we don't need
+ size_t num_bytes_released = 0;
+ mspace_inspect_all(mspace_, DontNeed, &num_bytes_released);
+}
+
+
+void AllocSpace::Walk(void(*callback)(void *start, void *end, size_t num_bytes, void* callback_arg),
+ void* arg) {
+ mspace_inspect_all(mspace_, callback, arg);
+}
+
+size_t AllocSpace::GetFootprintLimit() {
+ return mspace_footprint_limit(mspace_);
+}
+
+void AllocSpace::SetFootprintLimit(size_t new_size) {
+ VLOG(heap) << "AllocSpace::SetFootprintLimit " << (new_size/KB) << "KiB";
+ // Compare against the actual footprint, rather than the Size(), because the heap may not have
+ // grown all the way to the allowed size yet.
+ //
+ size_t current_space_size = mspace_footprint(mspace_);
+ if (new_size < current_space_size) {
+ // Don't let the space grow any more.
+ new_size = current_space_size;
+ }
+ mspace_set_footprint_limit(mspace_, new_size);
+}
+
+ImageSpace* Space::CreateImageSpace(const std::string& image_file_name) {
+ CHECK(image_file_name != NULL);
+
+ uint64_t start_time = 0;
+ if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
+ start_time = NanoTime();
+ LOG(INFO) << "Space::CreateImageSpace entering" << " image_file_name=" << image_file_name;
+ }
+
UniquePtr<File> file(OS::OpenFile(image_file_name.c_str(), false));
if (file.get() == NULL) {
- LOG(WARNING) << "Failed to open " << image_file_name;
- return false;
+ LOG(ERROR) << "Failed to open " << image_file_name;
+ return NULL;
}
ImageHeader image_header;
bool success = file->ReadFully(&image_header, sizeof(image_header));
if (!success || !image_header.IsValid()) {
- LOG(WARNING) << "Invalid image header " << image_file_name;
- return false;
+ LOG(ERROR) << "Invalid image header " << image_file_name;
+ return NULL;
}
- UniquePtr<MemMap> map(MemMap::MapFileAtAddress(image_header.GetImageBaseAddr(),
+ UniquePtr<MemMap> map(MemMap::MapFileAtAddress(image_header.GetImageBegin(),
file->Length(),
// TODO: selectively PROT_EXEC stubs
PROT_READ | PROT_WRITE | PROT_EXEC,
@@ -122,13 +278,13 @@
file->Fd(),
0));
if (map.get() == NULL) {
- LOG(WARNING) << "Failed to map " << image_file_name;
- return false;
+ LOG(ERROR) << "Failed to map " << image_file_name;
+ return NULL;
}
- CHECK_EQ(image_header.GetImageBaseAddr(), map->GetAddress());
- image_header_ = reinterpret_cast<ImageHeader*>(map->GetAddress());
- DCHECK_EQ(0, memcmp(&image_header, image_header_, sizeof(ImageHeader)));
+ CHECK_EQ(image_header.GetImageBegin(), map->Begin());
+ DCHECK_EQ(0, memcmp(&image_header, map->Begin(), sizeof(ImageHeader)));
+ Runtime* runtime = Runtime::Current();
Object* jni_stub_array = image_header.GetImageRoot(ImageHeader::kJniStubArray);
runtime->SetJniDlsymLookupStub(down_cast<ByteArray*>(jni_stub_array));
@@ -152,113 +308,44 @@
callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsAndArgsSaveMethod);
runtime->SetCalleeSaveMethod(down_cast<Method*>(callee_save_method), Runtime::kRefsAndArgs);
- InitFromMemMap(map.release());
- growth_limit_ = limit_;
- VLOG(startup) << "Space::InitFromImage exiting";
- return true;
-}
-
-Object* Space::AllocWithoutGrowth(size_t num_bytes) {
- DCHECK(mspace_ != NULL);
- return reinterpret_cast<Object*>(mspace_calloc(mspace_, 1, num_bytes));
-}
-
-Object* Space::AllocWithGrowth(size_t num_bytes) {
- DCHECK(mspace_ != NULL);
- // Grow as much as possible within the mspace.
- size_t max_allowed = growth_size_;
- mspace_set_max_allowed_footprint(mspace_, max_allowed);
- // Try the allocation.
- void* ptr = AllocWithoutGrowth(num_bytes);
- // Shrink back down as small as possible.
- size_t footprint = mspace_footprint(mspace_);
- mspace_set_max_allowed_footprint(mspace_, footprint);
- // Return the new allocation or NULL.
- return reinterpret_cast<Object*>(ptr);
-}
-
-size_t Space::Free(void* ptr) {
- DCHECK(mspace_ != NULL);
- DCHECK(ptr != NULL);
- size_t num_bytes = mspace_usable_size(mspace_, ptr);
- mspace_free(mspace_, ptr);
- return num_bytes;
-}
-
-size_t Space::FreeList(size_t num_ptrs, void** ptrs) {
- DCHECK(mspace_ != NULL);
- DCHECK(ptrs != NULL);
- void* merged = ptrs[0];
- size_t num_bytes = 0;
- for (size_t i = 1; i < num_ptrs; i++) {
- num_bytes += mspace_usable_size(mspace_, ptrs[i]);
- if (mspace_merge_objects(mspace_, merged, ptrs[i]) == NULL) {
- mspace_free(mspace_, merged);
- merged = ptrs[i];
- }
+ ImageSpace* space = new ImageSpace(image_file_name, map.release());
+ if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
+ uint64_t duration_ms = (NanoTime() - start_time)/1000/1000;
+ LOG(INFO) << "Space::CreateImageSpace exiting (" << duration_ms << " ms) " << *space;
}
- CHECK(merged != NULL);
- mspace_free(mspace_, merged);
- return num_bytes;
+ return space;
}
-size_t Space::AllocationSize(const Object* obj) {
- DCHECK(mspace_ != NULL);
- return mspace_usable_size(mspace_, obj) + kChunkOverhead;
-}
-
-void Space::DontNeed(void* start, void* end, void* num_bytes) {
- start = (void*)RoundUp((uintptr_t)start, kPageSize);
- end = (void*)RoundDown((uintptr_t)end, kPageSize);
- if (start >= end) {
- return;
+void ImageSpace::RecordImageAllocations(HeapBitmap* live_bitmap) const {
+ uint64_t start_time = 0;
+ if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
+ LOG(INFO) << "ImageSpace::RecordImageAllocations entering";
+ start_time = NanoTime();
}
- size_t length = reinterpret_cast<byte*>(end) - reinterpret_cast<byte*>(start);
- int result = madvise(start, length, MADV_DONTNEED);
- if (result == -1) {
- PLOG(WARNING) << "madvise failed";
- } else {
- *reinterpret_cast<size_t*>(num_bytes) += length;
+ DCHECK(!Runtime::Current()->IsStarted());
+ CHECK(live_bitmap != NULL);
+ byte* current = Begin() + RoundUp(sizeof(ImageHeader), kObjectAlignment);
+ byte* end = End();
+ while (current < end) {
+ DCHECK_ALIGNED(current, kObjectAlignment);
+ const Object* obj = reinterpret_cast<const Object*>(current);
+ live_bitmap->Set(obj);
+ current += RoundUp(obj->SizeOf(), kObjectAlignment);
+ }
+ if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
+ uint64_t duration_ms = (NanoTime() - start_time)/1000/1000;
+ LOG(INFO) << "ImageSpace::RecordImageAllocations exiting (" << duration_ms << " ms)";
}
}
-void Space::Trim() {
- CHECK(mspace_ != NULL);
- mspace_trim(mspace_, 0);
- size_t num_bytes_released = 0;
- mspace_walk_free_pages(mspace_, DontNeed, &num_bytes_released);
-}
-
-void Space::Walk(void(*callback)(const void*, size_t, const void*, size_t, void*), void* arg) {
- if (mspace_ != NULL) {
- mspace_walk_heap(mspace_, callback, arg);
- }
-}
-
-size_t Space::GetMaxAllowedFootprint() {
- DCHECK(mspace_ != NULL);
- return mspace_max_allowed_footprint(mspace_);
-}
-
-void Space::SetMaxAllowedFootprint(size_t limit) {
- DCHECK(mspace_ != NULL);
-
- // Compare against the actual footprint, rather than the
- // max_allowed, because the heap may not have grown all the
- // way to the allowed size yet.
- //
- size_t current_space_size = mspace_footprint(mspace_);
- if (limit < current_space_size) {
- // Don't let the space grow any more.
- mspace_set_max_allowed_footprint(mspace_, current_space_size);
- } else {
- // Let the heap grow to the requested limit.
- mspace_set_max_allowed_footprint(mspace_, limit);
- }
-}
-
-void Space::Grow(size_t new_size) {
- UNIMPLEMENTED(FATAL);
+std::ostream& operator<<(std::ostream& os, const Space& space) {
+ os << (space.IsImageSpace() ? "Image" : "Alloc") << "Space["
+ << "begin=" << reinterpret_cast<void*>(space.Begin())
+ << ",end=" << reinterpret_cast<void*>(space.End())
+ << ",size=" << (space.Size()/KB) << "KiB"
+ << ",capacity=" << (space.Capacity()/KB) << "KiB"
+ << ",name=\"" << space.GetSpaceName() << "\"]";
+ return os;
}
} // namespace art
diff --git a/src/space.h b/src/space.h
index be7dfdc..a932d7b 100644
--- a/src/space.h
+++ b/src/space.h
@@ -23,135 +23,217 @@
#include "globals.h"
#include "image.h"
#include "macros.h"
+#include "dlmalloc.h"
#include "mem_map.h"
-#include "mspace.h"
namespace art {
+class AllocSpace;
+class ImageSpace;
class Object;
// A space contains memory allocated for managed objects.
class Space {
public:
- // Create a Space with the requested sizes. The requested
+ // Create a AllocSpace with the requested sizes. The requested
// base address is not guaranteed to be granted, if it is required,
- // the caller should call GetBase on the returned space to confirm
+ // the caller should call Begin on the returned space to confirm
// the request was granted.
- static Space* Create(const std::string& name, size_t initial_size,
- size_t maximum_size, size_t growth_size, byte* requested_base);
+ static AllocSpace* CreateAllocSpace(const std::string& name, size_t initial_size,
+ size_t growth_limit, size_t capacity,
+ byte* requested_begin);
// create a Space from an image file. cannot be used for future allocation or collected.
- static Space* CreateFromImage(const std::string& image);
+ static ImageSpace* CreateImageSpace(const std::string& image);
- ~Space();
+ virtual ~Space() {}
- Object* AllocWithGrowth(size_t num_bytes);
-
- Object* AllocWithoutGrowth(size_t num_bytes);
-
- size_t Free(void* ptr);
-
- size_t FreeList(size_t num_ptrs, void** ptrs);
-
- void Trim();
-
- size_t GetMaxAllowedFootprint();
- void SetMaxAllowedFootprint(size_t limit);
-
- void Grow(size_t num_bytes);
-
- byte* GetBase() const {
- return base_;
+ const std::string& GetSpaceName() const {
+ return name_;
}
- byte* GetLimit() const {
+ // Address at which the space begins
+ byte* Begin() const {
+ return begin_;
+ }
+
+ // Address at which the space ends, which may vary as the space is filled
+ byte* End() const {
+ return end_;
+ }
+
+ // Is object within this space?
+ bool Contains(const Object* obj) const {
+ const byte* byte_ptr = reinterpret_cast<const byte*>(obj);
+ return Begin() <= byte_ptr && byte_ptr < End();
+ }
+
+ // Current size of space
+ size_t Size() const {
+ return End() - Begin();
+ }
+
+ // Maximum size of space
+ virtual size_t Capacity() const {
+ return mem_map_->Size();
+ }
+
+ // Support for having an impediment (GrowthLimit) removed from the space
+ virtual size_t UnimpededCapacity() const {
+ return Capacity();
+ }
+
+ ImageSpace* AsImageSpace() {
+ DCHECK(IsImageSpace());
+ return down_cast<ImageSpace*>(this);
+ }
+
+ AllocSpace* AsAllocSpace() {
+ DCHECK(IsAllocSpace());
+ return down_cast<AllocSpace*>(this);
+ }
+
+ virtual bool IsAllocSpace() const = 0;
+ virtual bool IsImageSpace() const = 0;
+
+ protected:
+ Space(const std::string& name, MemMap* mem_map, byte* end) : name_(name), mem_map_(mem_map),
+ begin_(mem_map->Begin()), end_(end) {}
+
+ std::string name_;
+ // Underlying storage of the space
+ UniquePtr<MemMap> mem_map_;
+
+ // The beginning of the storage for fast access (always equals mem_map_->GetAddress())
+ byte* const begin_;
+
+ // Current end of the space
+ byte* end_;
+
+ DISALLOW_COPY_AND_ASSIGN(Space);
+};
+
+std::ostream& operator<<(std::ostream& os, const Space& space);
+
+// An alloc space is a space where objects may be allocated and garbage collected.
+class AllocSpace : public Space {
+ public:
+ // Allocate num_bytes without allowing the underlying mspace to grow
+ Object* AllocWithGrowth(size_t num_bytes);
+
+ // Allocate num_bytes allowing the underlying mspace to grow
+ Object* AllocWithoutGrowth(size_t num_bytes);
+
+ // Return the storage space required by obj
+ size_t AllocationSize(const Object* obj);
+
+ void Free(Object* ptr);
+
+ void FreeList(size_t num_ptrs, Object** ptrs);
+
+ void* MoreCore(intptr_t increment);
+
+ void* GetMspace() const {
+ return mspace_;
+ }
+
+ // Hand unused pages back to the system
+ void Trim();
+
+ // Perform a mspace_inspect_all which calls back for each allocation chunk. The chunk may not be
+ // in use, indicated by num_bytes equaling zero
+ void Walk(void(*callback)(void *start, void *end, size_t num_bytes, void* callback_arg),
+ void* arg);
+
+ // Returns the number of bytes that the heap is allowed to obtain from the system via MoreCore
+ size_t GetFootprintLimit();
+
+ // Set the maximum number of bytes that the heap is allowed to obtain from the system via MoreCore
+ void SetFootprintLimit(size_t limit);
+
+ // Removes the fork time growth limit (fence on capacity), allowing the application to allocate
+ // up to the maximum heap size.
+ void ClearGrowthLimit() {
+ growth_limit_ = UnimpededCapacity();
+ }
+
+ // Override capacity so that we only return the possibly limited capacity
+ virtual size_t Capacity() const {
return growth_limit_;
}
- byte* GetMax() const {
- return base_ + maximum_size_;
+ virtual size_t UnimpededCapacity() const {
+ return mem_map_->End() - mem_map_->Begin();
}
- const std::string& GetName() const {
- return name_;
+ virtual bool IsAllocSpace() const {
+ return true;
}
- size_t Size() const {
- return growth_limit_ - base_;
- }
-
- bool IsImageSpace() const {
- return (image_header_ != NULL);
- }
-
- const ImageHeader& GetImageHeader() const {
- CHECK(IsImageSpace());
- return *image_header_;
- }
-
- const std::string& GetImageFilename() const {
- CHECK(IsImageSpace());
- return name_;
- }
-
- size_t AllocationSize(const Object* obj);
-
- void ClearGrowthLimit() {
- CHECK_GE(maximum_size_, growth_size_);
- CHECK_GE(limit_, growth_limit_);
- growth_size_ = maximum_size_;
- growth_limit_ = limit_;
- }
-
- void Walk(void(*callback)(const void*, size_t, const void*, size_t, void*), void* arg);
-
- bool Contains(const Object* obj) const {
- const byte* byte_ptr = reinterpret_cast<const byte*>(obj);
- return GetBase() <= byte_ptr && byte_ptr < GetLimit();
+ virtual bool IsImageSpace() const {
+ return false;
}
private:
+ friend class Space;
+
+ AllocSpace(const std::string& name, MemMap* mem_map, void* mspace, byte* end,
+ size_t growth_limit) :
+ Space(name, mem_map, end), mspace_(mspace), growth_limit_(growth_limit) {
+ CHECK(mspace != NULL);
+ }
+
+ bool Init(size_t initial_size, size_t maximum_size, size_t growth_size, byte* requested_base);
+
+ static void* CreateMallocSpace(void* base, size_t initial_size, size_t maximum_size);
+
// The boundary tag overhead.
static const size_t kChunkOverhead = kWordSize;
- // create a Space from an existing memory mapping, taking ownership of the address space.
- static Space* Create(MemMap* mem_map);
+ // Underlying malloc space
+ void* const mspace_;
- explicit Space(const std::string& name)
- : name_(name), mspace_(NULL), maximum_size_(0), growth_size_(0),
- image_header_(NULL), base_(0), limit_(0), growth_limit_(0) {
+ // The capacity of the alloc space until such time that ClearGrowthLimit is called.
+ // The underlying mem_map_ controls the maximum size we allow the heap to grow to. The growth
+ // limit is a value <= to the mem_map_ capacity used for ergonomic reasons because of the zygote.
+ // Prior to forking the zygote the heap will have a maximally sized mem_map_ but the growth_limit_
+ // will be set to a lower value. The growth_limit_ is used as the capacity of the alloc_space_,
+ // however, capacity normally can't vary. In the case of the growth_limit_ it can be cleared
+ // one time by a call to ClearGrowthLimit.
+ size_t growth_limit_;
+
+ DISALLOW_COPY_AND_ASSIGN(AllocSpace);
+};
+
+// An image space is a space backed with a memory mapped image
+class ImageSpace : public Space {
+ public:
+ const ImageHeader& GetImageHeader() const {
+ return *reinterpret_cast<ImageHeader*>(Begin());
}
- // Initializes the space and underlying storage.
- bool Init(size_t initial_size, size_t maximum_size, size_t growth_size, byte* requested_base);
+ const std::string& GetImageFilename() const {
+ return name_;
+ }
- // Initializes the space from existing storage, taking ownership of the storage.
- void InitFromMemMap(MemMap* map);
+ // Mark the objects defined in this space in the given live bitmap
+ void RecordImageAllocations(HeapBitmap* live_bitmap) const;
- // Initializes the space from an image file
- bool InitFromImage(const std::string& image_file_name);
+ virtual bool IsAllocSpace() const {
+ return false;
+ }
- void* CreateMallocSpace(void* base, size_t initial_size, size_t maximum_size);
+ virtual bool IsImageSpace() const {
+ return true;
+ }
- static void DontNeed(void* start, void* end, void* num_bytes);
+ private:
+ friend class Space;
- std::string name_;
+ ImageSpace(const std::string& name, MemMap* mem_map) :
+ Space(name, mem_map, mem_map->End()) {}
- // TODO: have a Space subclass for non-image Spaces with mspace_ and maximum_size_
- void* mspace_;
- size_t maximum_size_;
- size_t growth_size_;
-
- // TODO: have a Space subclass for image Spaces with image_header_
- ImageHeader* image_header_;
-
- UniquePtr<MemMap> mem_map_;
-
- byte* base_;
- byte* limit_;
- byte* growth_limit_;
-
- DISALLOW_COPY_AND_ASSIGN(Space);
+ DISALLOW_COPY_AND_ASSIGN(ImageSpace);
};
} // namespace art
diff --git a/src/space_test.cc b/src/space_test.cc
index c54a584..f6d1191 100644
--- a/src/space_test.cc
+++ b/src/space_test.cc
@@ -13,67 +13,71 @@
TEST_F(SpaceTest, Init) {
{
// Init < max == growth
- UniquePtr<Space> space(Space::Create("test", 16 * MB, 32 * MB, 32 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 16 * MB, 32 * MB, 32 * MB, NULL));
EXPECT_TRUE(space.get() != NULL);
}
{
// Init == max == growth
- UniquePtr<Space> space(Space::Create("test", 16 * MB, 16 * MB, 16 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 16 * MB, 16 * MB, 16 * MB, NULL));
EXPECT_TRUE(space.get() != NULL);
}
{
// Init > max == growth
- UniquePtr<Space> space(Space::Create("test", 32 * MB, 16 * MB, 16 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 32 * MB, 16 * MB, 16 * MB, NULL));
EXPECT_TRUE(space.get() == NULL);
}
{
// Growth == init < max
- UniquePtr<Space> space(Space::Create("test", 16 * MB, 32 * MB, 16 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 16 * MB, 16 * MB, 32 * MB, NULL));
EXPECT_TRUE(space.get() != NULL);
}
{
// Growth < init < max
- UniquePtr<Space> space(Space::Create("test", 16 * MB, 32 * MB, 8 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 16 * MB, 8 * MB, 32 * MB, NULL));
EXPECT_TRUE(space.get() == NULL);
}
{
// Init < growth < max
- UniquePtr<Space> space(Space::Create("test", 8 * MB, 32 * MB, 16 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 8 * MB, 16 * MB, 32 * MB, NULL));
EXPECT_TRUE(space.get() != NULL);
}
{
// Init < max < growth
- UniquePtr<Space> space(Space::Create("test", 8 * MB, 16 * MB, 32 * MB, NULL));
+ UniquePtr<Space> space(Space::CreateAllocSpace("test", 8 * MB, 32 * MB, 16 * MB, NULL));
EXPECT_TRUE(space.get() == NULL);
}
}
TEST_F(SpaceTest, AllocAndFree) {
- UniquePtr<Space> space(Space::Create("test", 4 * MB, 16 * MB, 16 * MB, NULL));
- ASSERT_TRUE(space.get() != NULL);
+ AllocSpace* space(Space::CreateAllocSpace("test", 4 * MB, 16 * MB, 16 * MB, NULL));
+ ASSERT_TRUE(space != NULL);
+
+ // Make space findable to the heap, will also delete class when runtime is cleaned up
+ Heap::AddSpace(space);
// Succeeds, fits without adjusting the max allowed footprint.
- void* ptr1 = space->AllocWithoutGrowth(1 * MB);
+ Object* ptr1 = space->AllocWithoutGrowth(1 * MB);
EXPECT_TRUE(ptr1 != NULL);
// Fails, requires a higher allowed footprint.
- void* ptr2 = space->AllocWithoutGrowth(8 * MB);
+ Object* ptr2 = space->AllocWithoutGrowth(8 * MB);
EXPECT_TRUE(ptr2 == NULL);
// Succeeds, adjusts the footprint.
- void* ptr3 = space->AllocWithGrowth(8 * MB);
+ Object* ptr3 = space->AllocWithGrowth(8 * MB);
EXPECT_TRUE(ptr3 != NULL);
// Fails, requires a higher allowed footprint.
- void* ptr4 = space->AllocWithoutGrowth(8 * MB);
+ Object* ptr4 = space->AllocWithoutGrowth(8 * MB);
EXPECT_FALSE(ptr4 != NULL);
// Also fails, requires a higher allowed footprint.
- void* ptr5 = space->AllocWithGrowth(8 * MB);
+ Object* ptr5 = space->AllocWithGrowth(8 * MB);
EXPECT_FALSE(ptr5 != NULL);
// Release some memory.
- size_t free3 = space->Free(ptr3);
+ size_t free3 = space->AllocationSize(ptr3);
+ space->Free(ptr3);
EXPECT_LE(8U * MB, free3);
// Succeeds, now that memory has been freed.
@@ -81,7 +85,8 @@
EXPECT_TRUE(ptr6 != NULL);
// Final clean up.
- size_t free1 = space->Free(ptr1);
+ size_t free1 = space->AllocationSize(ptr1);
+ space->Free(ptr1);
EXPECT_LE(1U * MB, free1);
}
diff --git a/src/thread.cc b/src/thread.cc
index 7722866..1a534f1 100644
--- a/src/thread.cc
+++ b/src/thread.cc
@@ -43,6 +43,7 @@
#include "runtime_support.h"
#include "ScopedLocalRef.h"
#include "scoped_jni_thread_state.h"
+#include "space.h"
#include "stack.h"
#include "stack_indirect_reference_table.h"
#include "thread_list.h"
@@ -68,7 +69,7 @@
static Method* gUncaughtExceptionHandler_uncaughtException = NULL;
void Thread::InitCardTable() {
- card_table_ = Heap::GetCardTable()->GetBiasedBase();
+ card_table_ = Heap::GetCardTable()->GetBiasedBegin();
}
void Thread::InitFunctionPointers() {
@@ -357,7 +358,7 @@
void* temp_stack_base;
CHECK_PTHREAD_CALL(pthread_attr_getstack, (&attributes, &temp_stack_base, &stack_size_),
__FUNCTION__);
- stack_base_ = reinterpret_cast<byte*>(temp_stack_base);
+ stack_begin_ = reinterpret_cast<byte*>(temp_stack_base);
if (stack_size_ <= kStackOverflowReservedBytes) {
LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)";
diff --git a/src/thread.h b/src/thread.h
index 856fd5c..d612f62 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -419,26 +419,26 @@
// Size of stack less any space reserved for stack overflow
size_t GetStackSize() {
- return stack_size_ - (stack_end_ - stack_base_);
+ return stack_size_ - (stack_end_ - stack_begin_);
}
// Set the stack end to that to be used during a stack overflow
void SetStackEndForStackOverflow() {
// During stack overflow we allow use of the full stack
- if (stack_end_ == stack_base_) {
+ if (stack_end_ == stack_begin_) {
DumpStack(std::cerr);
LOG(FATAL) << "Need to increase kStackOverflowReservedBytes (currently "
<< kStackOverflowReservedBytes << ")";
}
- stack_end_ = stack_base_;
+ stack_end_ = stack_begin_;
}
// Set the stack end to that to be used during regular execution
void ResetDefaultStackEnd() {
// Our stacks grow down, so we want stack_end_ to be near there, but reserving enough room
// to throw a StackOverflowError.
- stack_end_ = stack_base_ + kStackOverflowReservedBytes;
+ stack_end_ = stack_begin_ + kStackOverflowReservedBytes;
}
static ThreadOffset StackEndOffset() {
@@ -578,7 +578,7 @@
size_t stack_size_;
// The "lowest addressable byte" of the stack
- byte* stack_base_;
+ byte* stack_begin_;
// A linked list (of stack allocated records) recording transitions from
// native to managed code.
diff --git a/src/zip_archive.cc b/src/zip_archive.cc
index 73728a2..fd7086f 100644
--- a/src/zip_archive.cc
+++ b/src/zip_archive.cc
@@ -121,7 +121,7 @@
}
static bool CopyFdToMemory(MemMap& mem_map, int in, size_t count) {
- uint8_t* dst = mem_map.GetAddress();
+ uint8_t* dst = mem_map.Begin();
std::vector<uint8_t> buf(kBufSize);
while (count != 0) {
size_t bytes_to_read = (count > kBufSize) ? kBufSize : count;
@@ -134,7 +134,7 @@
dst += bytes_to_read;
count -= bytes_to_read;
}
- DCHECK_EQ(dst, mem_map.GetLimit());
+ DCHECK_EQ(dst, mem_map.End());
return true;
}
@@ -165,7 +165,7 @@
};
static bool InflateToMemory(MemMap& mem_map, int in, size_t uncompressed_length, size_t compressed_length) {
- uint8_t* dst = mem_map.GetAddress();
+ uint8_t* dst = mem_map.Begin();
UniquePtr<uint8_t[]> read_buf(new uint8_t[kBufSize]);
UniquePtr<uint8_t[]> write_buf(new uint8_t[kBufSize]);
if (read_buf.get() == NULL || write_buf.get() == NULL) {
@@ -235,7 +235,7 @@
return false;
}
- DCHECK_EQ(dst, mem_map.GetLimit());
+ DCHECK_EQ(dst, mem_map.End());
return true;
}
@@ -438,8 +438,8 @@
}
bool ZipArchive::Parse() {
- const byte* cd_ptr = dir_map_->GetAddress();
- size_t cd_length = dir_map_->GetLength();
+ const byte* cd_ptr = dir_map_->Begin();
+ size_t cd_length = dir_map_->Size();
// Walk through the central directory, adding entries to the hash
// table and verifying values.
diff --git a/test/061-out-of-memory/src/Main.java b/test/061-out-of-memory/src/Main.java
index b5999b3..c04d41f 100644
--- a/test/061-out-of-memory/src/Main.java
+++ b/test/061-out-of-memory/src/Main.java
@@ -46,15 +46,15 @@
/* Just shy of the typical max heap size so that it will actually
* try to allocate it instead of short-circuiting.
*
- * TODO: stop assuming the VM defaults to 16MB max
+ * TODO: stop assuming the VM defaults to 64MB max
*/
- final int SIXTEEN_MB = (16 * 1024 * 1024 - 32);
+ final int SIXTY_FOUR_MB = (64 * 1024 * 1024 - 32);
Boolean sawEx = false;
byte a[];
try {
- a = new byte[SIXTEEN_MB];
+ a = new byte[SIXTY_FOUR_MB];
} catch (OutOfMemoryError oom) {
//Log.i(TAG, "HeapTest/OomeLarge caught " + oom);
sawEx = true;
@@ -72,10 +72,10 @@
* list afterwards. Even if we null out list when we're done, the conservative
* GC may see a stale pointer to it in a register.
*
- * TODO: stop assuming the VM defaults to 16MB max
+ * TODO: stop assuming the VM defaults to 64MB max
*/
private static boolean testOomeSmallInternal() {
- final int SIXTEEN_MB = (16 * 1024 * 1024);
+ final int SIXTY_FOUR_MB = (64 * 1024 * 1024);
final int LINK_SIZE = 6 * 4; // estimated size of a LinkedList's node
LinkedList<Object> list = new LinkedList<Object>();
@@ -86,7 +86,7 @@
while (objSize >= LINK_SIZE) {
boolean sawEx = false;
try {
- for (int i = 0; i < SIXTEEN_MB / objSize; i++) {
+ for (int i = 0; i < SIXTY_FOUR_MB / objSize; i++) {
list.add((Object)new byte[objSize]);
}
} catch (OutOfMemoryError oom) {
