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android / platform / art / d3d00c06a4 / . / runtime / gc / space / image_space.cc
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/*
* Copyright (C) 2011 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.
*/
#include "image_space.h"
#include <sys/statvfs.h>
#include <sys/types.h>
#include <unistd.h>
#include <random>
#include "android-base/stringprintf.h"
#include "android-base/strings.h"
#include "arch/instruction_set.h"
#include "art_field-inl.h"
#include "art_method-inl.h"
#include "base/array_ref.h"
#include "base/bit_memory_region.h"
#include "base/callee_save_type.h"
#include "base/enums.h"
#include "base/file_utils.h"
#include "base/macros.h"
#include "base/os.h"
#include "base/scoped_flock.h"
#include "base/stl_util.h"
#include "base/string_view_cpp20.h"
#include "base/systrace.h"
#include "base/time_utils.h"
#include "base/utils.h"
#include "class_root.h"
#include "dex/art_dex_file_loader.h"
#include "dex/dex_file_loader.h"
#include "exec_utils.h"
#include "gc/accounting/space_bitmap-inl.h"
#include "gc/task_processor.h"
#include "image-inl.h"
#include "image_space_fs.h"
#include "intern_table-inl.h"
#include "mirror/class-inl.h"
#include "mirror/executable-inl.h"
#include "mirror/object-inl.h"
#include "mirror/object-refvisitor-inl.h"
#include "oat.h"
#include "oat_file.h"
#include "runtime.h"
#include "space-inl.h"
namespace art {
namespace gc {
namespace space {
using android::base::StringAppendF;
using android::base::StringPrintf;
// We do not allow the boot image and extensions to take more than 1GiB. They are
// supposed to be much smaller and allocating more that this would likely fail anyway.
static constexpr size_t kMaxTotalImageReservationSize = 1 * GB;
Atomic<uint32_t> ImageSpace::bitmap_index_(0);
ImageSpace::ImageSpace(const std::string& image_filename,
const char* image_location,
MemMap&& mem_map,
accounting::ContinuousSpaceBitmap&& live_bitmap,
uint8_t* end)
: MemMapSpace(image_filename,
std::move(mem_map),
mem_map.Begin(),
end,
end,
kGcRetentionPolicyNeverCollect),
live_bitmap_(std::move(live_bitmap)),
oat_file_non_owned_(nullptr),
image_location_(image_location) {
DCHECK(live_bitmap_.IsValid());
}
static int32_t ChooseRelocationOffsetDelta(int32_t min_delta, int32_t max_delta) {
CHECK_ALIGNED(min_delta, kPageSize);
CHECK_ALIGNED(max_delta, kPageSize);
CHECK_LT(min_delta, max_delta);
int32_t r = GetRandomNumber<int32_t>(min_delta, max_delta);
if (r % 2 == 0) {
r = RoundUp(r, kPageSize);
} else {
r = RoundDown(r, kPageSize);
}
CHECK_LE(min_delta, r);
CHECK_GE(max_delta, r);
CHECK_ALIGNED(r, kPageSize);
return r;
}
static int32_t ChooseRelocationOffsetDelta() {
return ChooseRelocationOffsetDelta(ART_BASE_ADDRESS_MIN_DELTA, ART_BASE_ADDRESS_MAX_DELTA);
}
static bool GenerateImage(const std::string& image_filename,
InstructionSet image_isa,
std::string* error_msg) {
Runtime* runtime = Runtime::Current();
const std::vector<std::string>& boot_class_path = runtime->GetBootClassPath();
if (boot_class_path.empty()) {
*error_msg = "Failed to generate image because no boot class path specified";
return false;
}
// We should clean up so we are more likely to have room for the image.
if (Runtime::Current()->IsZygote()) {
LOG(INFO) << "Pruning dalvik-cache since we are generating an image and will need to recompile";
PruneDalvikCache(image_isa);
}
std::vector<std::string> arg_vector;
std::string dex2oat(Runtime::Current()->GetCompilerExecutable());
arg_vector.push_back(dex2oat);
char* dex2oat_bcp = getenv("DEX2OATBOOTCLASSPATH");
std::vector<std::string> dex2oat_bcp_vector;
if (dex2oat_bcp != nullptr) {
arg_vector.push_back("--runtime-arg");
arg_vector.push_back(StringPrintf("-Xbootclasspath:%s", dex2oat_bcp));
Split(dex2oat_bcp, ':', &dex2oat_bcp_vector);
}
std::string image_option_string("--image=");
image_option_string += image_filename;
arg_vector.push_back(image_option_string);
if (!dex2oat_bcp_vector.empty()) {
for (size_t i = 0u; i < dex2oat_bcp_vector.size(); i++) {
arg_vector.push_back(std::string("--dex-file=") + dex2oat_bcp_vector[i]);
arg_vector.push_back(std::string("--dex-location=") + dex2oat_bcp_vector[i]);
}
} else {
const std::vector<std::string>& boot_class_path_locations =
runtime->GetBootClassPathLocations();
DCHECK_EQ(boot_class_path.size(), boot_class_path_locations.size());
for (size_t i = 0u; i < boot_class_path.size(); i++) {
arg_vector.push_back(std::string("--dex-file=") + boot_class_path[i]);
arg_vector.push_back(std::string("--dex-location=") + boot_class_path_locations[i]);
}
}
std::string oat_file_option_string("--oat-file=");
oat_file_option_string += ImageHeader::GetOatLocationFromImageLocation(image_filename);
arg_vector.push_back(oat_file_option_string);
// Note: we do not generate a fully debuggable boot image so we do not pass the
// compiler flag --debuggable here.
Runtime::Current()->AddCurrentRuntimeFeaturesAsDex2OatArguments(&arg_vector);
CHECK_EQ(image_isa, kRuntimeISA)
<< "We should always be generating an image for the current isa.";
int32_t base_offset = ChooseRelocationOffsetDelta();
LOG(INFO) << "Using an offset of 0x" << std::hex << base_offset << " from default "
<< "art base address of 0x" << std::hex << ART_BASE_ADDRESS;
arg_vector.push_back(StringPrintf("--base=0x%x", ART_BASE_ADDRESS + base_offset));
if (!kIsTargetBuild) {
arg_vector.push_back("--host");
}
const std::vector<std::string>& compiler_options = Runtime::Current()->GetImageCompilerOptions();
for (size_t i = 0; i < compiler_options.size(); ++i) {
arg_vector.push_back(compiler_options[i].c_str());
}
std::string command_line(android::base::Join(arg_vector, ' '));
LOG(INFO) << "GenerateImage: " << command_line;
return Exec(arg_vector, error_msg);
}
static bool FindImageFilenameImpl(const char* image_location,
const InstructionSet image_isa,
bool* has_system,
std::string* system_filename,
bool* dalvik_cache_exists,
std::string* dalvik_cache,
bool* is_global_cache,
bool* has_cache,
std::string* cache_filename) {
DCHECK(dalvik_cache != nullptr);
*has_system = false;
*has_cache = false;
// image_location = /system/framework/boot.art
// system_image_location = /system/framework/<image_isa>/boot.art
std::string system_image_filename(GetSystemImageFilename(image_location, image_isa));
if (OS::FileExists(system_image_filename.c_str())) {
*system_filename = system_image_filename;
*has_system = true;
}
bool have_android_data = false;
*dalvik_cache_exists = false;
GetDalvikCache(GetInstructionSetString(image_isa),
/*create_if_absent=*/ true,
dalvik_cache,
&have_android_data,
dalvik_cache_exists,
is_global_cache);
if (*dalvik_cache_exists) {
DCHECK(have_android_data);
// Always set output location even if it does not exist,
// so that the caller knows where to create the image.
//
// image_location = /system/framework/boot.art
// *image_filename = /data/dalvik-cache/<image_isa>/system@framework@boot.art
std::string error_msg;
if (!GetDalvikCacheFilename(image_location,
dalvik_cache->c_str(),
cache_filename,
&error_msg)) {
LOG(WARNING) << error_msg;
return *has_system;
}
*has_cache = OS::FileExists(cache_filename->c_str());
}
return *has_system || *has_cache;
}
bool ImageSpace::FindImageFilename(const char* image_location,
const InstructionSet image_isa,
std::string* system_filename,
bool* has_system,
std::string* cache_filename,
bool* dalvik_cache_exists,
bool* has_cache,
bool* is_global_cache) {
std::string dalvik_cache_unused;
return FindImageFilenameImpl(image_location,
image_isa,
has_system,
system_filename,
dalvik_cache_exists,
&dalvik_cache_unused,
is_global_cache,
has_cache,
cache_filename);
}
static bool ReadSpecificImageHeader(const char* filename,
ImageHeader* image_header,
std::string* error_msg) {
std::unique_ptr<File> image_file(OS::OpenFileForReading(filename));
if (image_file.get() == nullptr) {
*error_msg = StringPrintf("Unable to open file \"%s\" for reading image header", filename);
return false;
}
const bool success = image_file->ReadFully(image_header, sizeof(ImageHeader));
if (!success) {
*error_msg = StringPrintf("Unable to read image header from file \"%s\"", filename);
return false;
}
if (!image_header->IsValid()) {
*error_msg = StringPrintf("Image header from file \"%s\" is invalid", filename);
return false;
}
return true;
}
static std::unique_ptr<ImageHeader> ReadSpecificImageHeader(const char* filename,
std::string* error_msg) {
std::unique_ptr<ImageHeader> hdr(new ImageHeader);
if (!ReadSpecificImageHeader(filename, hdr.get(), error_msg)) {
return nullptr;
}
return hdr;
}
std::unique_ptr<ImageHeader> ImageSpace::ReadImageHeader(const char* image_location,
const InstructionSet image_isa,
ImageSpaceLoadingOrder order,
std::string* error_msg) {
std::string system_filename;
bool has_system = false;
std::string cache_filename;
bool has_cache = false;
bool dalvik_cache_exists = false;
bool is_global_cache = false;
if (FindImageFilename(image_location,
image_isa,
&system_filename,
&has_system,
&cache_filename,
&dalvik_cache_exists,
&has_cache,
&is_global_cache)) {
if (order == ImageSpaceLoadingOrder::kSystemFirst) {
if (has_system) {
return ReadSpecificImageHeader(system_filename.c_str(), error_msg);
}
if (has_cache) {
return ReadSpecificImageHeader(cache_filename.c_str(), error_msg);
}
} else {
if (has_cache) {
return ReadSpecificImageHeader(cache_filename.c_str(), error_msg);
}
if (has_system) {
return ReadSpecificImageHeader(system_filename.c_str(), error_msg);
}
}
}
*error_msg = StringPrintf("Unable to find image file for %s", image_location);
return nullptr;
}
static bool CanWriteToDalvikCache(const InstructionSet isa) {
const std::string dalvik_cache = GetDalvikCache(GetInstructionSetString(isa));
if (access(dalvik_cache.c_str(), O_RDWR) == 0) {
return true;
} else if (errno != EACCES) {
PLOG(WARNING) << "CanWriteToDalvikCache returned error other than EACCES";
}
return false;
}
static bool ImageCreationAllowed(bool is_global_cache,
const InstructionSet isa,
bool is_zygote,
std::string* error_msg) {
// Anyone can write into a "local" cache.
if (!is_global_cache) {
return true;
}
// Only the zygote running as root is allowed to create the global boot image.
// If the zygote is running as non-root (and cannot write to the dalvik-cache),
// then image creation is not allowed..
if (is_zygote) {
return CanWriteToDalvikCache(isa);
}
*error_msg = "Only the zygote can create the global boot image.";
return false;
}
void ImageSpace::VerifyImageAllocations() {
uint8_t* current = Begin() + RoundUp(sizeof(ImageHeader), kObjectAlignment);
while (current < End()) {
CHECK_ALIGNED(current, kObjectAlignment);
auto* obj = reinterpret_cast<mirror::Object*>(current);
CHECK(obj->GetClass() != nullptr) << "Image object at address " << obj << " has null class";
CHECK(live_bitmap_.Test(obj)) << obj->PrettyTypeOf();
if (kUseBakerReadBarrier) {
obj->AssertReadBarrierState();
}
current += RoundUp(obj->SizeOf(), kObjectAlignment);
}
}
// Helper class for relocating from one range of memory to another.
class RelocationRange {
public:
RelocationRange() = default;
RelocationRange(const RelocationRange&) = default;
RelocationRange(uintptr_t source, uintptr_t dest, uintptr_t length)
: source_(source),
dest_(dest),
length_(length) {}
bool InSource(uintptr_t address) const {
return address - source_ < length_;
}
bool InDest(const void* dest) const {
return InDest(reinterpret_cast<uintptr_t>(dest));
}
bool InDest(uintptr_t address) const {
return address - dest_ < length_;
}
// Translate a source address to the destination space.
uintptr_t ToDest(uintptr_t address) const {
DCHECK(InSource(address));
return address + Delta();
}
template <typename T>
T* ToDest(T* src) const {
return reinterpret_cast<T*>(ToDest(reinterpret_cast<uintptr_t>(src)));
}
// Returns the delta between the dest from the source.
uintptr_t Delta() const {
return dest_ - source_;
}
uintptr_t Source() const {
return source_;
}
uintptr_t Dest() const {
return dest_;
}
uintptr_t Length() const {
return length_;
}
private:
const uintptr_t source_;
const uintptr_t dest_;
const uintptr_t length_;
};
std::ostream& operator<<(std::ostream& os, const RelocationRange& reloc) {
return os << "(" << reinterpret_cast<const void*>(reloc.Source()) << "-"
<< reinterpret_cast<const void*>(reloc.Source() + reloc.Length()) << ")->("
<< reinterpret_cast<const void*>(reloc.Dest()) << "-"
<< reinterpret_cast<const void*>(reloc.Dest() + reloc.Length()) << ")";
}
template <PointerSize kPointerSize, typename HeapVisitor, typename NativeVisitor>
class ImageSpace::PatchObjectVisitor final {
public:
explicit PatchObjectVisitor(HeapVisitor heap_visitor, NativeVisitor native_visitor)
: heap_visitor_(heap_visitor), native_visitor_(native_visitor) {}
void VisitClass(ObjPtr<mirror::Class> klass, ObjPtr<mirror::Class> class_class)
REQUIRES_SHARED(Locks::mutator_lock_) {
// A mirror::Class object consists of
// - instance fields inherited from j.l.Object,
// - instance fields inherited from j.l.Class,
// - embedded tables (vtable, interface method table),
// - static fields of the class itself.
// The reference fields are at the start of each field section (this is how the
// ClassLinker orders fields; except when that would create a gap between superclass
// fields and the first reference of the subclass due to alignment, it can be filled
// with smaller fields - but that's not the case for j.l.Object and j.l.Class).
DCHECK_ALIGNED(klass.Ptr(), kObjectAlignment);
static_assert(IsAligned<kHeapReferenceSize>(kObjectAlignment), "Object alignment check.");
// First, patch the `klass->klass_`, known to be a reference to the j.l.Class.class.
// This should be the only reference field in j.l.Object and we assert that below.
DCHECK_EQ(class_class,
heap_visitor_(klass->GetClass<kVerifyNone, kWithoutReadBarrier>()));
klass->SetFieldObjectWithoutWriteBarrier<
/*kTransactionActive=*/ false,
/*kCheckTransaction=*/ true,
kVerifyNone>(mirror::Object::ClassOffset(), class_class);
// Then patch the reference instance fields described by j.l.Class.class.
// Use the sizeof(Object) to determine where these reference fields start;
// this is the same as `class_class->GetFirstReferenceInstanceFieldOffset()`
// after patching but the j.l.Class may not have been patched yet.
size_t num_reference_instance_fields = class_class->NumReferenceInstanceFields<kVerifyNone>();
DCHECK_NE(num_reference_instance_fields, 0u);
static_assert(IsAligned<kHeapReferenceSize>(sizeof(mirror::Object)), "Size alignment check.");
MemberOffset instance_field_offset(sizeof(mirror::Object));
for (size_t i = 0; i != num_reference_instance_fields; ++i) {
PatchReferenceField(klass, instance_field_offset);
static_assert(sizeof(mirror::HeapReference<mirror::Object>) == kHeapReferenceSize,
"Heap reference sizes equality check.");
instance_field_offset =
MemberOffset(instance_field_offset.Uint32Value() + kHeapReferenceSize);
}
// Now that we have patched the `super_class_`, if this is the j.l.Class.class,
// we can get a reference to j.l.Object.class and assert that it has only one
// reference instance field (the `klass_` patched above).
if (kIsDebugBuild && klass == class_class) {
ObjPtr<mirror::Class> object_class =
klass->GetSuperClass<kVerifyNone, kWithoutReadBarrier>();
CHECK_EQ(object_class->NumReferenceInstanceFields<kVerifyNone>(), 1u);
}
// Then patch static fields.
size_t num_reference_static_fields = klass->NumReferenceStaticFields<kVerifyNone>();
if (num_reference_static_fields != 0u) {
MemberOffset static_field_offset =
klass->GetFirstReferenceStaticFieldOffset<kVerifyNone>(kPointerSize);
for (size_t i = 0; i != num_reference_static_fields; ++i) {
PatchReferenceField(klass, static_field_offset);
static_assert(sizeof(mirror::HeapReference<mirror::Object>) == kHeapReferenceSize,
"Heap reference sizes equality check.");
static_field_offset =
MemberOffset(static_field_offset.Uint32Value() + kHeapReferenceSize);
}
}
// Then patch native pointers.
klass->FixupNativePointers<kVerifyNone>(klass.Ptr(), kPointerSize, *this);
}
template <typename T>
T* operator()(T* ptr, void** dest_addr ATTRIBUTE_UNUSED) const {
return (ptr != nullptr) ? native_visitor_(ptr) : nullptr;
}
void VisitPointerArray(ObjPtr<mirror::PointerArray> pointer_array)
REQUIRES_SHARED(Locks::mutator_lock_) {
// Fully patch the pointer array, including the `klass_` field.
PatchReferenceField</*kMayBeNull=*/ false>(pointer_array, mirror::Object::ClassOffset());
int32_t length = pointer_array->GetLength<kVerifyNone>();
for (int32_t i = 0; i != length; ++i) {
ArtMethod** method_entry = reinterpret_cast<ArtMethod**>(
pointer_array->ElementAddress<kVerifyNone>(i, kPointerSize));
PatchNativePointer</*kMayBeNull=*/ false>(method_entry);
}
}
void VisitObject(mirror::Object* object) REQUIRES_SHARED(Locks::mutator_lock_) {
// Visit all reference fields.
object->VisitReferences</*kVisitNativeRoots=*/ false,
kVerifyNone,
kWithoutReadBarrier>(*this, *this);
// This function should not be called for classes.
DCHECK(!object->IsClass<kVerifyNone>());
}
// Visitor for VisitReferences().
ALWAYS_INLINE void operator()(ObjPtr<mirror::Object> object,
MemberOffset field_offset,
bool is_static)
const REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(!is_static);
PatchReferenceField(object, field_offset);
}
// Visitor for VisitReferences(), java.lang.ref.Reference case.
ALWAYS_INLINE void operator()(ObjPtr<mirror::Class> klass, ObjPtr<mirror::Reference> ref) const
REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(klass->IsTypeOfReferenceClass());
this->operator()(ref, mirror::Reference::ReferentOffset(), /*is_static=*/ false);
}
// Ignore class native roots; not called from VisitReferences() for kVisitNativeRoots == false.
void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED)
const {}
void VisitRoot(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) const {}
void VisitDexCacheArrays(ObjPtr<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_) {
FixupDexCacheArray<mirror::StringDexCacheType>(dex_cache,
mirror::DexCache::StringsOffset(),
dex_cache->NumStrings<kVerifyNone>());
FixupDexCacheArray<mirror::TypeDexCacheType>(dex_cache,
mirror::DexCache::ResolvedTypesOffset(),
dex_cache->NumResolvedTypes<kVerifyNone>());
FixupDexCacheArray<mirror::MethodDexCacheType>(dex_cache,
mirror::DexCache::ResolvedMethodsOffset(),
dex_cache->NumResolvedMethods<kVerifyNone>());
FixupDexCacheArray<mirror::FieldDexCacheType>(dex_cache,
mirror::DexCache::ResolvedFieldsOffset(),
dex_cache->NumResolvedFields<kVerifyNone>());
FixupDexCacheArray<mirror::MethodTypeDexCacheType>(
dex_cache,
mirror::DexCache::ResolvedMethodTypesOffset(),
dex_cache->NumResolvedMethodTypes<kVerifyNone>());
FixupDexCacheArray<GcRoot<mirror::CallSite>>(
dex_cache,
mirror::DexCache::ResolvedCallSitesOffset(),
dex_cache->NumResolvedCallSites<kVerifyNone>());
FixupDexCacheArray<GcRoot<mirror::String>>(
dex_cache,
mirror::DexCache::PreResolvedStringsOffset(),
dex_cache->NumPreResolvedStrings<kVerifyNone>());
}
template <bool kMayBeNull = true, typename T>
ALWAYS_INLINE void PatchGcRoot(/*inout*/GcRoot<T>* root) const
REQUIRES_SHARED(Locks::mutator_lock_) {
static_assert(sizeof(GcRoot<mirror::Class*>) == sizeof(uint32_t), "GcRoot size check");
T* old_value = root->template Read<kWithoutReadBarrier>();
DCHECK(kMayBeNull || old_value != nullptr);
if (!kMayBeNull || old_value != nullptr) {
*root = GcRoot<T>(heap_visitor_(old_value));
}
}
template <bool kMayBeNull = true, typename T>
ALWAYS_INLINE void PatchNativePointer(/*inout*/T** entry) const {
if (kPointerSize == PointerSize::k64) {
uint64_t* raw_entry = reinterpret_cast<uint64_t*>(entry);
T* old_value = reinterpret_cast64<T*>(*raw_entry);
DCHECK(kMayBeNull || old_value != nullptr);
if (!kMayBeNull || old_value != nullptr) {
T* new_value = native_visitor_(old_value);
*raw_entry = reinterpret_cast64<uint64_t>(new_value);
}
} else {
uint32_t* raw_entry = reinterpret_cast<uint32_t*>(entry);
T* old_value = reinterpret_cast32<T*>(*raw_entry);
DCHECK(kMayBeNull || old_value != nullptr);
if (!kMayBeNull || old_value != nullptr) {
T* new_value = native_visitor_(old_value);
*raw_entry = reinterpret_cast32<uint32_t>(new_value);
}
}
}
template <bool kMayBeNull = true>
ALWAYS_INLINE void PatchReferenceField(ObjPtr<mirror::Object> object, MemberOffset offset) const
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Object> old_value =
object->GetFieldObject<mirror::Object, kVerifyNone, kWithoutReadBarrier>(offset);
DCHECK(kMayBeNull || old_value != nullptr);
if (!kMayBeNull || old_value != nullptr) {
ObjPtr<mirror::Object> new_value = heap_visitor_(old_value.Ptr());
object->SetFieldObjectWithoutWriteBarrier</*kTransactionActive=*/ false,
/*kCheckTransaction=*/ true,
kVerifyNone>(offset, new_value);
}
}
template <typename T>
void FixupDexCacheArrayEntry(std::atomic<mirror::DexCachePair<T>>* array, uint32_t index)
REQUIRES_SHARED(Locks::mutator_lock_) {
static_assert(sizeof(std::atomic<mirror::DexCachePair<T>>) == sizeof(mirror::DexCachePair<T>),
"Size check for removing std::atomic<>.");
PatchGcRoot(&(reinterpret_cast<mirror::DexCachePair<T>*>(array)[index].object));
}
template <typename T>
void FixupDexCacheArrayEntry(std::atomic<mirror::NativeDexCachePair<T>>* array, uint32_t index)
REQUIRES_SHARED(Locks::mutator_lock_) {
static_assert(sizeof(std::atomic<mirror::NativeDexCachePair<T>>) ==
sizeof(mirror::NativeDexCachePair<T>),
"Size check for removing std::atomic<>.");
mirror::NativeDexCachePair<T> pair =
mirror::DexCache::GetNativePairPtrSize(array, index, kPointerSize);
if (pair.object != nullptr) {
pair.object = native_visitor_(pair.object);
mirror::DexCache::SetNativePairPtrSize(array, index, pair, kPointerSize);
}
}
void FixupDexCacheArrayEntry(GcRoot<mirror::CallSite>* array, uint32_t index)
REQUIRES_SHARED(Locks::mutator_lock_) {
PatchGcRoot(&array[index]);
}
void FixupDexCacheArrayEntry(GcRoot<mirror::String>* array, uint32_t index)
REQUIRES_SHARED(Locks::mutator_lock_) {
PatchGcRoot(&array[index]);
}
template <typename EntryType>
void FixupDexCacheArray(ObjPtr<mirror::DexCache> dex_cache,
MemberOffset array_offset,
uint32_t size) REQUIRES_SHARED(Locks::mutator_lock_) {
EntryType* old_array =
reinterpret_cast64<EntryType*>(dex_cache->GetField64<kVerifyNone>(array_offset));
DCHECK_EQ(old_array != nullptr, size != 0u);
if (old_array != nullptr) {
EntryType* new_array = native_visitor_(old_array);
dex_cache->SetField64<kVerifyNone>(array_offset, reinterpret_cast64<uint64_t>(new_array));
for (uint32_t i = 0; i != size; ++i) {
FixupDexCacheArrayEntry(new_array, i);
}
}
}
private:
// Heap objects visitor.
HeapVisitor heap_visitor_;
// Native objects visitor.
NativeVisitor native_visitor_;
};
template <typename ReferenceVisitor>
class ImageSpace::ClassTableVisitor final {
public:
explicit ClassTableVisitor(const ReferenceVisitor& reference_visitor)
: reference_visitor_(reference_visitor) {}
void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const
REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(root->AsMirrorPtr() != nullptr);
root->Assign(reference_visitor_(root->AsMirrorPtr()));
}
private:
ReferenceVisitor reference_visitor_;
};
// Helper class encapsulating loading, so we can access private ImageSpace members (this is a
// nested class), but not declare functions in the header.
class ImageSpace::Loader {
public:
static std::unique_ptr<ImageSpace> InitAppImage(const char* image_filename,
const char* image_location,
const OatFile* oat_file,
/*inout*/MemMap* image_reservation,
/*out*/std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_) {
TimingLogger logger(__PRETTY_FUNCTION__, /*precise=*/ true, VLOG_IS_ON(image));
std::unique_ptr<ImageSpace> space = Init(image_filename,
image_location,
oat_file,
&logger,
image_reservation,
error_msg);
if (space != nullptr) {
uint32_t expected_reservation_size =
RoundUp(space->GetImageHeader().GetImageSize(), kPageSize);
if (!CheckImageReservationSize(*space, expected_reservation_size, error_msg) ||
!CheckImageComponentCount(*space, /*expected_component_count=*/ 1u, error_msg)) {
return nullptr;
}
TimingLogger::ScopedTiming timing("RelocateImage", &logger);
ImageHeader* image_header = reinterpret_cast<ImageHeader*>(space->GetMemMap()->Begin());
const PointerSize pointer_size = image_header->GetPointerSize();
bool result;
if (pointer_size == PointerSize::k64) {
result = RelocateInPlace<PointerSize::k64>(*image_header,
space->GetMemMap()->Begin(),
space->GetLiveBitmap(),
oat_file,
error_msg);
} else {
result = RelocateInPlace<PointerSize::k32>(*image_header,
space->GetMemMap()->Begin(),
space->GetLiveBitmap(),
oat_file,
error_msg);
}
if (!result) {
return nullptr;
}
Runtime* runtime = Runtime::Current();
CHECK_EQ(runtime->GetResolutionMethod(),
image_header->GetImageMethod(ImageHeader::kResolutionMethod));
CHECK_EQ(runtime->GetImtConflictMethod(),
image_header->GetImageMethod(ImageHeader::kImtConflictMethod));
CHECK_EQ(runtime->GetImtUnimplementedMethod(),
image_header->GetImageMethod(ImageHeader::kImtUnimplementedMethod));
CHECK_EQ(runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveAllCalleeSaves),
image_header->GetImageMethod(ImageHeader::kSaveAllCalleeSavesMethod));
CHECK_EQ(runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsOnly),
image_header->GetImageMethod(ImageHeader::kSaveRefsOnlyMethod));
CHECK_EQ(runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs),
image_header->GetImageMethod(ImageHeader::kSaveRefsAndArgsMethod));
CHECK_EQ(runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveEverything),
image_header->GetImageMethod(ImageHeader::kSaveEverythingMethod));
CHECK_EQ(runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveEverythingForClinit),
image_header->GetImageMethod(ImageHeader::kSaveEverythingMethodForClinit));
CHECK_EQ(runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveEverythingForSuspendCheck),
image_header->GetImageMethod(ImageHeader::kSaveEverythingMethodForSuspendCheck));
VLOG(image) << "ImageSpace::Loader::InitAppImage exiting " << *space.get();
}
if (VLOG_IS_ON(image)) {
logger.Dump(LOG_STREAM(INFO));
}
return space;
}
static std::unique_ptr<ImageSpace> Init(const char* image_filename,
const char* image_location,
const OatFile* oat_file,
TimingLogger* logger,
/*inout*/MemMap* image_reservation,
/*out*/std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_) {
CHECK(image_filename != nullptr);
CHECK(image_location != nullptr);
VLOG(image) << "ImageSpace::Init entering image_filename=" << image_filename;
std::unique_ptr<File> file;
{
TimingLogger::ScopedTiming timing("OpenImageFile", logger);
file.reset(OS::OpenFileForReading(image_filename));
if (file == nullptr) {
*error_msg = StringPrintf("Failed to open '%s'", image_filename);
return nullptr;
}
}
ImageHeader temp_image_header;
ImageHeader* image_header = &temp_image_header;
{
TimingLogger::ScopedTiming timing("ReadImageHeader", logger);
bool success = file->ReadFully(image_header, sizeof(*image_header));
if (!success || !image_header->IsValid()) {
*error_msg = StringPrintf("Invalid image header in '%s'", image_filename);
return nullptr;
}
}
// Check that the file is larger or equal to the header size + data size.
const uint64_t image_file_size = static_cast<uint64_t>(file->GetLength());
if (image_file_size < sizeof(ImageHeader) + image_header->GetDataSize()) {
*error_msg = StringPrintf(
"Image file truncated: %" PRIu64 " vs. %" PRIu64 ".",
image_file_size,
static_cast<uint64_t>(sizeof(ImageHeader) + image_header->GetDataSize()));
return nullptr;
}
if (oat_file != nullptr) {
// If we have an oat file (i.e. for app image), check the oat file checksum.
// Otherwise, we open the oat file after the image and check the checksum there.
const uint32_t oat_checksum = oat_file->GetOatHeader().GetChecksum();
const uint32_t image_oat_checksum = image_header->GetOatChecksum();
if (oat_checksum != image_oat_checksum) {
*error_msg = StringPrintf("Oat checksum 0x%x does not match the image one 0x%x in image %s",
oat_checksum,
image_oat_checksum,
image_filename);
return nullptr;
}
}
if (VLOG_IS_ON(startup)) {
LOG(INFO) << "Dumping image sections";
for (size_t i = 0; i < ImageHeader::kSectionCount; ++i) {
const auto section_idx = static_cast<ImageHeader::ImageSections>(i);
auto& section = image_header->GetImageSection(section_idx);
LOG(INFO) << section_idx << " start="
<< reinterpret_cast<void*>(image_header->GetImageBegin() + section.Offset()) << " "
<< section;
}
}
const auto& bitmap_section = image_header->GetImageBitmapSection();
// The location we want to map from is the first aligned page after the end of the stored
// (possibly compressed) data.
const size_t image_bitmap_offset = RoundUp(sizeof(ImageHeader) + image_header->GetDataSize(),
kPageSize);
const size_t end_of_bitmap = image_bitmap_offset + bitmap_section.Size();
if (end_of_bitmap != image_file_size) {
*error_msg = StringPrintf(
"Image file size does not equal end of bitmap: size=%" PRIu64 " vs. %zu.",
image_file_size,
end_of_bitmap);
return nullptr;
}
// GetImageBegin is the preferred address to map the image. If we manage to map the
// image at the image begin, the amount of fixup work required is minimized.
// If it is pic we will retry with error_msg for the2 failure case. Pass a null error_msg to
// avoid reading proc maps for a mapping failure and slowing everything down.
// For the boot image, we have already reserved the memory and we load the image
// into the `image_reservation`.
MemMap map = LoadImageFile(
image_filename,
image_location,
*image_header,
file->Fd(),
logger,
image_reservation,
error_msg);
if (!map.IsValid()) {
DCHECK(!error_msg->empty());
return nullptr;
}
DCHECK_EQ(0, memcmp(image_header, map.Begin(), sizeof(ImageHeader)));
MemMap image_bitmap_map = MemMap::MapFile(bitmap_section.Size(),
PROT_READ,
MAP_PRIVATE,
file->Fd(),
image_bitmap_offset,
/*low_4gb=*/ false,
image_filename,
error_msg);
if (!image_bitmap_map.IsValid()) {
*error_msg = StringPrintf("Failed to map image bitmap: %s", error_msg->c_str());
return nullptr;
}
// Loaded the map, use the image header from the file now in case we patch it with
// RelocateInPlace.
image_header = reinterpret_cast<ImageHeader*>(map.Begin());
const uint32_t bitmap_index = ImageSpace::bitmap_index_.fetch_add(1);
std::string bitmap_name(StringPrintf("imagespace %s live-bitmap %u",
image_filename,
bitmap_index));
// Bitmap only needs to cover until the end of the mirror objects section.
const ImageSection& image_objects = image_header->GetObjectsSection();
// We only want the mirror object, not the ArtFields and ArtMethods.
uint8_t* const image_end = map.Begin() + image_objects.End();
accounting::ContinuousSpaceBitmap bitmap;
{
TimingLogger::ScopedTiming timing("CreateImageBitmap", logger);
bitmap = accounting::ContinuousSpaceBitmap::CreateFromMemMap(
bitmap_name,
std::move(image_bitmap_map),
reinterpret_cast<uint8_t*>(map.Begin()),
// Make sure the bitmap is aligned to card size instead of just bitmap word size.
RoundUp(image_objects.End(), gc::accounting::CardTable::kCardSize));
if (!bitmap.IsValid()) {
*error_msg = StringPrintf("Could not create bitmap '%s'", bitmap_name.c_str());
return nullptr;
}
}
// We only want the mirror object, not the ArtFields and ArtMethods.
std::unique_ptr<ImageSpace> space(new ImageSpace(image_filename,
image_location,
std::move(map),
std::move(bitmap),
image_end));
space->oat_file_non_owned_ = oat_file;
return space;
}
static bool CheckImageComponentCount(const ImageSpace& space,
uint32_t expected_component_count,
/*out*/std::string* error_msg) {
const ImageHeader& header = space.GetImageHeader();
if (header.GetComponentCount() != expected_component_count) {
*error_msg = StringPrintf("Unexpected component count in %s, received %u, expected %u",
space.GetImageFilename().c_str(),
header.GetComponentCount(),
expected_component_count);
return false;
}
return true;
}
static bool CheckImageReservationSize(const ImageSpace& space,
uint32_t expected_reservation_size,
/*out*/std::string* error_msg) {
const ImageHeader& header = space.GetImageHeader();
if (header.GetImageReservationSize() != expected_reservation_size) {
*error_msg = StringPrintf("Unexpected reservation size in %s, received %u, expected %u",
space.GetImageFilename().c_str(),
header.GetImageReservationSize(),
expected_reservation_size);
return false;
}
return true;
}
private:
static MemMap LoadImageFile(const char* image_filename,
const char* image_location,
const ImageHeader& image_header,
int fd,
TimingLogger* logger,
/*inout*/MemMap* image_reservation,
/*out*/std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_) {
TimingLogger::ScopedTiming timing("MapImageFile", logger);
std::string temp_error_msg;
const bool is_compressed = image_header.HasCompressedBlock();
if (!is_compressed) {
uint8_t* address = (image_reservation != nullptr) ? image_reservation->Begin() : nullptr;
return MemMap::MapFileAtAddress(address,
image_header.GetImageSize(),
PROT_READ | PROT_WRITE,
MAP_PRIVATE,
fd,
/*start=*/ 0,
/*low_4gb=*/ true,
image_filename,
/*reuse=*/ false,
image_reservation,
error_msg);
}
// Reserve output and decompress into it.
MemMap map = MemMap::MapAnonymous(image_location,
image_header.GetImageSize(),
PROT_READ | PROT_WRITE,
/*low_4gb=*/ true,
image_reservation,
error_msg);
if (map.IsValid()) {
const size_t stored_size = image_header.GetDataSize();
MemMap temp_map = MemMap::MapFile(sizeof(ImageHeader) + stored_size,
PROT_READ,
MAP_PRIVATE,
fd,
/*start=*/ 0,
/*low_4gb=*/ false,
image_filename,
error_msg);
if (!temp_map.IsValid()) {
DCHECK(error_msg == nullptr || !error_msg->empty());
return MemMap::Invalid();
}
memcpy(map.Begin(), &image_header, sizeof(ImageHeader));
Runtime::ScopedThreadPoolUsage stpu;
ThreadPool* const pool = stpu.GetThreadPool();
const uint64_t start = NanoTime();
Thread* const self = Thread::Current();
static constexpr size_t kMinBlocks = 2u;
const bool use_parallel = pool != nullptr && image_header.GetBlockCount() >= kMinBlocks;
for (const ImageHeader::Block& block : image_header.GetBlocks(temp_map.Begin())) {
auto function = [&](Thread*) {
const uint64_t start2 = NanoTime();
ScopedTrace trace("LZ4 decompress block");
bool result = block.Decompress(/*out_ptr=*/map.Begin(),
/*in_ptr=*/temp_map.Begin(),
error_msg);
if (!result && error_msg != nullptr) {
*error_msg = "Failed to decompress image block " + *error_msg;
}
VLOG(image) << "Decompress block " << block.GetDataSize() << " -> "
<< block.GetImageSize() << " in " << PrettyDuration(NanoTime() - start2);
};
if (use_parallel) {
pool->AddTask(self, new FunctionTask(std::move(function)));
} else {
function(self);
}
}
if (use_parallel) {
ScopedTrace trace("Waiting for workers");
// Go to native since we don't want to suspend while holding the mutator lock.
ScopedThreadSuspension sts(Thread::Current(), kNative);
pool->Wait(self, true, false);
}
const uint64_t time = NanoTime() - start;
// Add one 1 ns to prevent possible divide by 0.
VLOG(image) << "Decompressing image took " << PrettyDuration(time) << " ("
<< PrettySize(static_cast<uint64_t>(map.Size()) * MsToNs(1000) / (time + 1))
<< "/s)";
}
return map;
}
class EmptyRange {
public:
ALWAYS_INLINE bool InSource(uintptr_t) const { return false; }
ALWAYS_INLINE bool InDest(uintptr_t) const { return false; }
ALWAYS_INLINE uintptr_t ToDest(uintptr_t) const { UNREACHABLE(); }
};
template <typename Range0, typename Range1 = EmptyRange, typename Range2 = EmptyRange>
class ForwardAddress {
public:
explicit ForwardAddress(const Range0& range0 = Range0(),
const Range1& range1 = Range1(),
const Range2& range2 = Range2())
: range0_(range0), range1_(range1), range2_(range2) {}
// Return the relocated address of a heap object.
// Null checks must be performed in the caller (for performance reasons).
template <typename T>
ALWAYS_INLINE T* operator()(T* src) const {
DCHECK(src != nullptr);
const uintptr_t uint_src = reinterpret_cast<uintptr_t>(src);
if (range2_.InSource(uint_src)) {
return reinterpret_cast<T*>(range2_.ToDest(uint_src));
}
if (range1_.InSource(uint_src)) {
return reinterpret_cast<T*>(range1_.ToDest(uint_src));
}
CHECK(range0_.InSource(uint_src))
<< reinterpret_cast<const void*>(src) << " not in "
<< reinterpret_cast<const void*>(range0_.Source()) << "-"
<< reinterpret_cast<const void*>(range0_.Source() + range0_.Length());
return reinterpret_cast<T*>(range0_.ToDest(uint_src));
}
private:
const Range0 range0_;
const Range1 range1_;
const Range2 range2_;
};
template <typename Forward>
class FixupRootVisitor {
public:
template<typename... Args>
explicit FixupRootVisitor(Args... args) : forward_(args...) {}
ALWAYS_INLINE void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!root->IsNull()) {
VisitRoot(root);
}
}
ALWAYS_INLINE void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const
REQUIRES_SHARED(Locks::mutator_lock_) {
mirror::Object* ref = root->AsMirrorPtr();
mirror::Object* new_ref = forward_(ref);
if (ref != new_ref) {
root->Assign(new_ref);
}
}
private:
Forward forward_;
};
template <typename Forward>
class FixupObjectVisitor {
public:
explicit FixupObjectVisitor(gc::accounting::ContinuousSpaceBitmap* visited,
const Forward& forward)
: visited_(visited), forward_(forward) {}
// Fix up separately since we also need to fix up method entrypoints.
ALWAYS_INLINE void VisitRootIfNonNull(
mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) const {}
ALWAYS_INLINE void VisitRoot(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED)
const {}
ALWAYS_INLINE void operator()(ObjPtr<mirror::Object> obj,
MemberOffset offset,
bool is_static ATTRIBUTE_UNUSED) const
NO_THREAD_SAFETY_ANALYSIS {
// Space is not yet added to the heap, don't do a read barrier.
mirror::Object* ref = obj->GetFieldObject<mirror::Object, kVerifyNone, kWithoutReadBarrier>(
offset);
if (ref != nullptr) {
// Use SetFieldObjectWithoutWriteBarrier to avoid card marking since we are writing to the
// image.
obj->SetFieldObjectWithoutWriteBarrier<false, true, kVerifyNone>(offset, forward_(ref));
}
}
// java.lang.ref.Reference visitor.
ALWAYS_INLINE void operator()(ObjPtr<mirror::Class> klass, ObjPtr<mirror::Reference> ref) const
REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(Locks::heap_bitmap_lock_) {
DCHECK(klass->IsTypeOfReferenceClass());
this->operator()(ref, mirror::Reference::ReferentOffset(), /*is_static=*/ false);
}
void operator()(mirror::Object* obj) const
NO_THREAD_SAFETY_ANALYSIS {
if (!visited_->Set(obj)) {
// Not already visited.
obj->VisitReferences</*visit native roots*/false, kVerifyNone, kWithoutReadBarrier>(
*this,
*this);
CHECK(!obj->IsClass());
}
}
private:
gc::accounting::ContinuousSpaceBitmap* const visited_;
Forward forward_;
};
// Relocate an image space mapped at target_base which possibly used to be at a different base
// address. In place means modifying a single ImageSpace in place rather than relocating from
// one ImageSpace to another.
template <PointerSize kPointerSize>
static bool RelocateInPlace(ImageHeader& image_header,
uint8_t* target_base,
accounting::ContinuousSpaceBitmap* bitmap,
const OatFile* app_oat_file,
std::string* error_msg) {
DCHECK(error_msg != nullptr);
// Set up sections.
gc::Heap* const heap = Runtime::Current()->GetHeap();
uint32_t boot_image_begin = heap->GetBootImagesStartAddress();
uint32_t boot_image_size = heap->GetBootImagesSize();
if (boot_image_size == 0u) {
*error_msg = "Can not relocate app image without boot image space";
return false;
}
const uint32_t image_header_boot_image_size = image_header.GetBootImageSize();
if (boot_image_size != image_header_boot_image_size) {
*error_msg = StringPrintf("Boot image size %" PRIu64 " does not match expected size %"
PRIu64,
static_cast<uint64_t>(boot_image_size),
static_cast<uint64_t>(image_header_boot_image_size));
return false;
}
const ImageSection& objects_section = image_header.GetObjectsSection();
// Where the app image objects are mapped to.
uint8_t* objects_location = target_base + objects_section.Offset();
TimingLogger logger(__FUNCTION__, true, false);
RelocationRange boot_image(image_header.GetBootImageBegin(),
boot_image_begin,
boot_image_size);
// Metadata is everything after the objects section, use exclusion to be safe.
RelocationRange app_image_metadata(
reinterpret_cast<uintptr_t>(image_header.GetImageBegin()) + objects_section.End(),
reinterpret_cast<uintptr_t>(target_base) + objects_section.End(),
image_header.GetImageSize() - objects_section.End());
// App image heap objects, may be mapped in the heap.
RelocationRange app_image_objects(
reinterpret_cast<uintptr_t>(image_header.GetImageBegin()) + objects_section.Offset(),
reinterpret_cast<uintptr_t>(objects_location),
objects_section.Size());
// Use the oat data section since this is where the OatFile::Begin is.
RelocationRange app_oat(reinterpret_cast<uintptr_t>(image_header.GetOatDataBegin()),
// Not necessarily in low 4GB.
reinterpret_cast<uintptr_t>(app_oat_file->Begin()),
image_header.GetOatDataEnd() - image_header.GetOatDataBegin());
VLOG(image) << "App image metadata " << app_image_metadata;
VLOG(image) << "App image objects " << app_image_objects;
VLOG(image) << "App oat " << app_oat;
VLOG(image) << "Boot image " << boot_image;
// True if we need to fixup any heap pointers.
const bool fixup_image = boot_image.Delta() != 0 || app_image_metadata.Delta() != 0 ||
app_image_objects.Delta() != 0;
if (!fixup_image) {
// Nothing to fix up.
return true;
}
ScopedDebugDisallowReadBarriers sddrb(Thread::Current());
using ForwardObject = ForwardAddress<RelocationRange, RelocationRange>;
ForwardObject forward_object(boot_image, app_image_objects);
ForwardObject forward_metadata(boot_image, app_image_metadata);
using ForwardCode = ForwardAddress<RelocationRange, RelocationRange>;
ForwardCode forward_code(boot_image, app_oat);
PatchObjectVisitor<kPointerSize, ForwardObject, ForwardCode> patch_object_visitor(
forward_object,
forward_metadata);
if (fixup_image) {
// Two pass approach, fix up all classes first, then fix up non class-objects.
// The visited bitmap is used to ensure that pointer arrays are not forwarded twice.
gc::accounting::ContinuousSpaceBitmap visited_bitmap(
gc::accounting::ContinuousSpaceBitmap::Create("Relocate bitmap",
target_base,
image_header.GetImageSize()));
{
TimingLogger::ScopedTiming timing("Fixup classes", &logger);
ObjPtr<mirror::Class> class_class = [&]() NO_THREAD_SAFETY_ANALYSIS {
ObjPtr<mirror::ObjectArray<mirror::Object>> image_roots = app_image_objects.ToDest(
image_header.GetImageRoots<kWithoutReadBarrier>().Ptr());
int32_t class_roots_index = enum_cast<int32_t>(ImageHeader::kClassRoots);
DCHECK_LT(class_roots_index, image_roots->GetLength<kVerifyNone>());
ObjPtr<mirror::ObjectArray<mirror::Class>> class_roots =
ObjPtr<mirror::ObjectArray<mirror::Class>>::DownCast(boot_image.ToDest(
image_roots->GetWithoutChecks<kVerifyNone>(class_roots_index).Ptr()));
return GetClassRoot<mirror::Class, kWithoutReadBarrier>(class_roots);
}();
const auto& class_table_section = image_header.GetClassTableSection();
if (class_table_section.Size() > 0u) {
ScopedObjectAccess soa(Thread::Current());
ClassTableVisitor class_table_visitor(forward_object);
size_t read_count = 0u;
const uint8_t* data = target_base + class_table_section.Offset();
// We avoid making a copy of the data since we want modifications to be propagated to the
// memory map.
ClassTable::ClassSet temp_set(data, /*make_copy_of_data=*/ false, &read_count);
for (ClassTable::TableSlot& slot : temp_set) {
slot.VisitRoot(class_table_visitor);
ObjPtr<mirror::Class> klass = slot.Read<kWithoutReadBarrier>();
if (!app_image_objects.InDest(klass.Ptr())) {
continue;
}
const bool already_marked = visited_bitmap.Set(klass.Ptr());
CHECK(!already_marked) << "App image class already visited";
patch_object_visitor.VisitClass(klass, class_class);
// Then patch the non-embedded vtable and iftable.
ObjPtr<mirror::PointerArray> vtable =
klass->GetVTable<kVerifyNone, kWithoutReadBarrier>();
if (vtable != nullptr &&
app_image_objects.InDest(vtable.Ptr()) &&
!visited_bitmap.Set(vtable.Ptr())) {
patch_object_visitor.VisitPointerArray(vtable);
}
ObjPtr<mirror::IfTable> iftable = klass->GetIfTable<kVerifyNone, kWithoutReadBarrier>();
if (iftable != nullptr && app_image_objects.InDest(iftable.Ptr())) {
// Avoid processing the fields of iftable since we will process them later anyways
// below.
int32_t ifcount = klass->GetIfTableCount<kVerifyNone>();
for (int32_t i = 0; i != ifcount; ++i) {
ObjPtr<mirror::PointerArray> unpatched_ifarray =
iftable->GetMethodArrayOrNull<kVerifyNone, kWithoutReadBarrier>(i);
if (unpatched_ifarray != nullptr) {
// The iftable has not been patched, so we need to explicitly adjust the pointer.
ObjPtr<mirror::PointerArray> ifarray = forward_object(unpatched_ifarray.Ptr());
if (app_image_objects.InDest(ifarray.Ptr()) &&
!visited_bitmap.Set(ifarray.Ptr())) {
patch_object_visitor.VisitPointerArray(ifarray);
}
}
}
}
}
}
}
// Fixup objects may read fields in the boot image, use the mutator lock here for sanity.
// Though its probably not required.
TimingLogger::ScopedTiming timing("Fixup objects", &logger);
ScopedObjectAccess soa(Thread::Current());
// Need to update the image to be at the target base.
uintptr_t objects_begin = reinterpret_cast<uintptr_t>(target_base + objects_section.Offset());
uintptr_t objects_end = reinterpret_cast<uintptr_t>(target_base + objects_section.End());
FixupObjectVisitor<ForwardObject> fixup_object_visitor(&visited_bitmap, forward_object);
bitmap->VisitMarkedRange(objects_begin, objects_end, fixup_object_visitor);
// Fixup image roots.
CHECK(app_image_objects.InSource(reinterpret_cast<uintptr_t>(
image_header.GetImageRoots<kWithoutReadBarrier>().Ptr())));
image_header.RelocateImageReferences(app_image_objects.Delta());
image_header.RelocateBootImageReferences(boot_image.Delta());
CHECK_EQ(image_header.GetImageBegin(), target_base);
// Fix up dex cache DexFile pointers.
ObjPtr<mirror::ObjectArray<mirror::DexCache>> dex_caches =
image_header.GetImageRoot<kWithoutReadBarrier>(ImageHeader::kDexCaches)
->AsObjectArray<mirror::DexCache, kVerifyNone>();
for (int32_t i = 0, count = dex_caches->GetLength(); i < count; ++i) {
ObjPtr<mirror::DexCache> dex_cache = dex_caches->Get<kVerifyNone, kWithoutReadBarrier>(i);
CHECK(dex_cache != nullptr);
patch_object_visitor.VisitDexCacheArrays(dex_cache);
}
}
{
// Only touches objects in the app image, no need for mutator lock.
TimingLogger::ScopedTiming timing("Fixup methods", &logger);
image_header.VisitPackedArtMethods([&](ArtMethod& method) NO_THREAD_SAFETY_ANALYSIS {
// TODO: Consider a separate visitor for runtime vs normal methods.
if (UNLIKELY(method.IsRuntimeMethod())) {
ImtConflictTable* table = method.GetImtConflictTable(kPointerSize);
if (table != nullptr) {
ImtConflictTable* new_table = forward_metadata(table);
if (table != new_table) {
method.SetImtConflictTable(new_table, kPointerSize);
}
}
const void* old_code = method.GetEntryPointFromQuickCompiledCodePtrSize(kPointerSize);
const void* new_code = forward_code(old_code);
if (old_code != new_code) {
method.SetEntryPointFromQuickCompiledCodePtrSize(new_code, kPointerSize);
}
} else {
patch_object_visitor.PatchGcRoot(&method.DeclaringClassRoot());
method.UpdateEntrypoints(forward_code, kPointerSize);
}
}, target_base, kPointerSize);
}
if (fixup_image) {
{
// Only touches objects in the app image, no need for mutator lock.
TimingLogger::ScopedTiming timing("Fixup fields", &logger);
image_header.VisitPackedArtFields([&](ArtField& field) NO_THREAD_SAFETY_ANALYSIS {
patch_object_visitor.template PatchGcRoot</*kMayBeNull=*/ false>(
&field.DeclaringClassRoot());
}, target_base);
}
{
TimingLogger::ScopedTiming timing("Fixup imt", &logger);
image_header.VisitPackedImTables(forward_metadata, target_base, kPointerSize);
}
{
TimingLogger::ScopedTiming timing("Fixup conflict tables", &logger);
image_header.VisitPackedImtConflictTables(forward_metadata, target_base, kPointerSize);
}
// Fix up the intern table.
const auto& intern_table_section = image_header.GetInternedStringsSection();
if (intern_table_section.Size() > 0u) {
TimingLogger::ScopedTiming timing("Fixup intern table", &logger);
ScopedObjectAccess soa(Thread::Current());
// Fixup the pointers in the newly written intern table to contain image addresses.
InternTable temp_intern_table;
// Note that we require that ReadFromMemory does not make an internal copy of the elements
// so that the VisitRoots() will update the memory directly rather than the copies.
temp_intern_table.AddTableFromMemory(target_base + intern_table_section.Offset(),
[&](InternTable::UnorderedSet& strings)
REQUIRES_SHARED(Locks::mutator_lock_) {
for (GcRoot<mirror::String>& root : strings) {
root = GcRoot<mirror::String>(forward_object(root.Read<kWithoutReadBarrier>()));
}
}, /*is_boot_image=*/ false);
}
}
if (VLOG_IS_ON(image)) {
logger.Dump(LOG_STREAM(INFO));
}
return true;
}
};
static void AppendImageChecksum(uint32_t component_count,
uint32_t checksum,
/*inout*/std::string* checksums) {
static_assert(ImageSpace::kImageChecksumPrefix == 'i', "Format prefix check.");
StringAppendF(checksums, "i;%u/%08x", component_count, checksum);
}
static bool CheckAndRemoveImageChecksum(uint32_t component_count,
uint32_t checksum,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
std::string image_checksum;
AppendImageChecksum(component_count, checksum, &image_checksum);
if (!StartsWith(*oat_checksums, image_checksum)) {
*error_msg = StringPrintf("Image checksum mismatch, expected %s to start with %s",
std::string(*oat_checksums).c_str(),
image_checksum.c_str());
return false;
}
oat_checksums->remove_prefix(image_checksum.size());
return true;
}
// Helper class to find the primary boot image and boot image extensions
// and determine the boot image layout.
class ImageSpace::BootImageLayout {
public:
// Description of a "chunk" of the boot image, i.e. either primary boot image
// or a boot image extension, used in conjunction with the boot class path to
// load boot image components.
struct ImageChunk {
std::string base_location;
std::string base_filename;
size_t start_index;
size_t component_count;
size_t reservation_size;
uint32_t checksum;
};
BootImageLayout(const std::string& image_location, ArrayRef<const std::string> boot_class_path)
: image_location_(image_location),
boot_class_path_(boot_class_path) {}
std::string GetPrimaryImageLocation();
bool LoadFromSystem(InstructionSet image_isa, /*out*/std::string* error_msg) {
return LoadOrValidateFromSystem(image_isa, /*oat_checksums=*/ nullptr, error_msg);
}
bool ValidateFromSystem(InstructionSet image_isa,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
DCHECK(oat_checksums != nullptr);
return LoadOrValidateFromSystem(image_isa, oat_checksums, error_msg);
}
bool LoadFromDalvikCache(const std::string& dalvik_cache, /*out*/std::string* error_msg) {
return LoadOrValidateFromDalvikCache(dalvik_cache, /*oat_checksums=*/ nullptr, error_msg);
}
bool ValidateFromDalvikCache(const std::string& dalvik_cache,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
DCHECK(oat_checksums != nullptr);
return LoadOrValidateFromDalvikCache(dalvik_cache, oat_checksums, error_msg);
}
ArrayRef<const ImageChunk> GetChunks() const {
return ArrayRef<const ImageChunk>(chunks_);
}
uint32_t GetBaseAddress() const {
return base_address_;
}
size_t GetNextBcpIndex() const {
return next_bcp_index_;
}
size_t GetTotalComponentCount() const {
return total_component_count_;
}
size_t GetTotalReservationSize() const {
return total_reservation_size_;
}
private:
std::string ExpandLocationImpl(const std::string& location,
size_t bcp_index,
bool boot_image_extension) {
std::vector<std::string> expanded = ExpandMultiImageLocations(
ArrayRef<const std::string>(boot_class_path_).SubArray(bcp_index, 1u),
location,
boot_image_extension);
DCHECK_EQ(expanded.size(), 1u);
return expanded[0];
}
std::string ExpandLocation(const std::string& location, size_t bcp_index) {
if (bcp_index == 0u) {
DCHECK_EQ(location, ExpandLocationImpl(location, bcp_index, /*boot_image_extension=*/ false));
return location;
} else {
return ExpandLocationImpl(location, bcp_index, /*boot_image_extension=*/ true);
}
}
bool VerifyImageLocation(const std::vector<std::string>& components,
/*out*/size_t* named_components_count,
/*out*/std::string* error_msg);
bool MatchNamedComponents(
ArrayRef<const std::string> named_components,
/*out*/std::vector<std::pair<std::string, size_t>>* base_locations_and_bcp_indexes,
/*out*/std::string* error_msg);
bool ReadHeader(const std::string& base_location,
const std::string& base_filename,
size_t bcp_index,
size_t bcp_component_count,
/*out*/std::string* error_msg);
bool CheckAndRemoveLastChunkChecksum(/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg);
template <typename FilenameFn>
bool LoadOrValidate(FilenameFn&& filename_fn,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg);
bool LoadOrValidateFromSystem(InstructionSet image_isa,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg);
bool LoadOrValidateFromDalvikCache(const std::string& dalvik_cache,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg);
const std::string& image_location_;
ArrayRef<const std::string> boot_class_path_;
std::vector<ImageChunk> chunks_;
uint32_t base_address_ = 0u;
size_t next_bcp_index_ = 0u;
size_t total_component_count_ = 0u;
size_t total_reservation_size_ = 0u;
};
std::string ImageSpace::BootImageLayout::GetPrimaryImageLocation() {
size_t location_start = 0u;
size_t location_end = image_location_.find(':');
while (location_end == location_start) {
++location_start;
location_end = image_location_.find(location_start, ':');
}
std::string location = (location_end == std::string::npos)
? image_location_.substr(location_start)
: image_location_.substr(location_start, location_end - location_start);
if (image_location_.find('/') == std::string::npos) {
// No path, so use the path from the first boot class path component.
size_t slash_pos = boot_class_path_.empty()
? std::string::npos
: boot_class_path_[0].rfind('/');
if (slash_pos == std::string::npos) {
return std::string();
}
location.insert(0u, boot_class_path_[0].substr(0u, slash_pos + 1u));
}
return location;
}
bool ImageSpace::BootImageLayout::VerifyImageLocation(
const std::vector<std::string>& components,
/*out*/size_t* named_components_count,
/*out*/std::string* error_msg) {
DCHECK(named_components_count != nullptr);
// Validate boot class path. Require a path and non-empty name in each component.
for (const std::string& bcp_component : boot_class_path_) {
size_t bcp_slash_pos = bcp_component.rfind('/');
if (bcp_slash_pos == std::string::npos || bcp_slash_pos == bcp_component.size() - 1u) {
*error_msg = StringPrintf("Invalid boot class path component: %s", bcp_component.c_str());
return false;
}
}
// Validate the format of image location components.
size_t components_size = components.size();
if (components_size == 0u) {
*error_msg = "Empty image location.";
return false;
}
size_t wildcards_start = components_size; // No wildcards.
for (size_t i = 0; i != components_size; ++i) {
const std::string& component = components[i];
DCHECK(!component.empty()); // Guaranteed by Split().
size_t wildcard_pos = component.find('*');
if (wildcard_pos == std::string::npos) {
if (wildcards_start != components.size()) {
*error_msg =
StringPrintf("Image component without wildcard after component with wildcard: %s",
component.c_str());
return false;
}
if (component.back() == '/') {
*error_msg = StringPrintf("Image component ends with path separator: %s",
component.c_str());
return false;
}
} else {
if (wildcards_start == components_size) {
wildcards_start = i;
}
// Wildcard must be the last character.
if (wildcard_pos != component.size() - 1u) {
*error_msg = StringPrintf("Unsupported wildcard (*) position in %s", component.c_str());
return false;
}
// And it must be either plain wildcard or preceded by a path separator.
if (component.size() != 1u && component[wildcard_pos - 1u] != '/') {
*error_msg = StringPrintf("Non-plain wildcard (*) not preceded by path separator '/': %s",
component.c_str());
return false;
}
if (i == 0) {
*error_msg = StringPrintf("Primary component contains wildcard (*): %s", component.c_str());
return false;
}
}
}
*named_components_count = wildcards_start;
return true;
}
bool ImageSpace::BootImageLayout::MatchNamedComponents(
ArrayRef<const std::string> named_components,
/*out*/std::vector<std::pair<std::string, size_t>>* base_locations_and_bcp_indexes,
/*out*/std::string* error_msg) {
DCHECK(!named_components.empty());
DCHECK(base_locations_and_bcp_indexes->empty());
base_locations_and_bcp_indexes->reserve(named_components.size());
size_t bcp_component_count = boot_class_path_.size();
size_t bcp_pos = 0;
std::string base_name;
for (size_t i = 0, size = named_components.size(); i != size; ++i) {
const std::string& component = named_components[i];
size_t slash_pos = component.rfind('/');
std::string base_location;
if (i == 0u) {
// The primary boot image name is taken as provided. It forms the base
// for expanding the extension filenames.
if (slash_pos != std::string::npos) {
base_name = component.substr(slash_pos + 1u);
base_location = component;
} else {
base_name = component;
size_t bcp_slash_pos = boot_class_path_[0u].rfind('/');
DCHECK_NE(bcp_slash_pos, std::string::npos);
base_location = boot_class_path_[0u].substr(0u, bcp_slash_pos + 1u) + component;
}
} else {
std::string to_match;
if (slash_pos != std::string::npos) {
// If we have the full path, we just need to match the filename to the BCP component.
base_location = component.substr(0u, slash_pos + 1u) + base_name;
to_match = component;
}
while (true) {
if (slash_pos == std::string::npos) {
// If we do not have a full path, we need to update the path based on the BCP location.
size_t bcp_slash_pos = boot_class_path_[bcp_pos].rfind('/');
DCHECK_NE(bcp_slash_pos, std::string::npos);
std::string path = boot_class_path_[bcp_pos].substr(0u, bcp_slash_pos + 1u);
to_match = path + component;
base_location = path + base_name;
}
if (ExpandLocation(base_location, bcp_pos) == to_match) {
break;
}
++bcp_pos;
if (bcp_pos == bcp_component_count) {
*error_msg = StringPrintf("Image component %s does not match a boot class path component",
component.c_str());
return false;
}
}
}
base_locations_and_bcp_indexes->emplace_back(base_location, bcp_pos);
++bcp_pos;
}
return true;
}
bool ImageSpace::BootImageLayout::ReadHeader(const std::string& base_location,
const std::string& base_filename,
size_t bcp_index,
size_t bcp_component_count,
/*out*/std::string* error_msg) {
DCHECK_LE(next_bcp_index_, bcp_index);
DCHECK_LT(bcp_index, bcp_component_count);
size_t allowed_component_count = bcp_component_count - bcp_index;
DCHECK_LE(total_reservation_size_, kMaxTotalImageReservationSize);
size_t allowed_reservation_size = kMaxTotalImageReservationSize - total_reservation_size_;
std::string actual_filename = ExpandLocation(base_filename, bcp_index);
ImageHeader header;
if (!ReadSpecificImageHeader(actual_filename.c_str(), &header, error_msg)) {
return false;
}
if (header.GetComponentCount() == 0u ||
header.GetComponentCount() > allowed_component_count) {
*error_msg = StringPrintf("Unexpected component count in %s, received %u, "
"expected non-zero and <= %zu",
actual_filename.c_str(),
header.GetComponentCount(),
allowed_component_count);
return false;
}
if (header.GetImageReservationSize() > allowed_reservation_size) {
*error_msg = StringPrintf("Reservation size too big in %s: %u > %zu",
actual_filename.c_str(),
header.GetImageReservationSize(),
allowed_reservation_size);
return false;
}
if (chunks_.empty()) {
base_address_ = reinterpret_cast32<uint32_t>(header.GetImageBegin());
}
ImageChunk chunk;
chunk.base_location = base_location;
chunk.base_filename = base_filename;
chunk.start_index = bcp_index;
chunk.component_count = header.GetComponentCount();
chunk.reservation_size = header.GetImageReservationSize();
chunk.checksum = header.GetImageChecksum();
chunks_.push_back(std::move(chunk));
next_bcp_index_ = bcp_index + header.GetComponentCount();
total_component_count_ += header.GetComponentCount();
total_reservation_size_ += header.GetImageReservationSize();
return true;
}
bool ImageSpace::BootImageLayout::CheckAndRemoveLastChunkChecksum(
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
DCHECK(oat_checksums != nullptr);
DCHECK(!chunks_.empty());
const ImageChunk& chunk = chunks_.back();
size_t component_count = chunk.component_count;
size_t checksum = chunk.checksum;
if (!CheckAndRemoveImageChecksum(component_count, checksum, oat_checksums, error_msg)) {
DCHECK(!error_msg->empty());
return false;
}
if (oat_checksums->empty()) {
if (next_bcp_index_ != boot_class_path_.size()) {
*error_msg = StringPrintf("Checksum too short, missing %zu components.",
boot_class_path_.size() - next_bcp_index_);
return false;
}
return true;
}
if (!StartsWith(*oat_checksums, ":")) {
*error_msg = StringPrintf("Missing ':' separator at start of %s",
std::string(*oat_checksums).c_str());
return false;
}
oat_checksums->remove_prefix(1u);
if (oat_checksums->empty()) {
*error_msg = "Missing checksums after the ':' separator.";
return false;
}
return true;
}
template <typename FilenameFn>
bool ImageSpace::BootImageLayout::LoadOrValidate(FilenameFn&& filename_fn,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
DCHECK(GetChunks().empty());
DCHECK_EQ(GetBaseAddress(), 0u);
bool validate = (oat_checksums != nullptr);
static_assert(ImageSpace::kImageChecksumPrefix == 'i', "Format prefix check.");
DCHECK(!validate || StartsWith(*oat_checksums, "i"));
std::vector<std::string> components;
Split(image_location_, ':', &components);
size_t named_components_count = 0u;
if (!VerifyImageLocation(components, &named_components_count, error_msg)) {
return false;
}
ArrayRef<const std::string> named_components =
ArrayRef<const std::string>(components).SubArray(/*pos=*/ 0u, named_components_count);
std::vector<std::pair<std::string, size_t>> base_locations_and_bcp_indexes;
if (!MatchNamedComponents(named_components, &base_locations_and_bcp_indexes, error_msg)) {
return false;
}
// Load the image headers of named components.
DCHECK_EQ(base_locations_and_bcp_indexes.size(), named_components.size());
const size_t bcp_component_count = boot_class_path_.size();
size_t bcp_pos = 0u;
for (size_t i = 0, size = named_components.size(); i != size; ++i) {
const std::string& base_location = base_locations_and_bcp_indexes[i].first;
size_t bcp_index = base_locations_and_bcp_indexes[i].second;
if (bcp_index < bcp_pos) {
DCHECK_NE(i, 0u);
LOG(ERROR) << "Named image component already covered by previous image: " << base_location;
continue;
}
if (validate && bcp_index > bcp_pos) {
*error_msg = StringPrintf("End of contiguous boot class path images, remaining checksum: %s",
std::string(*oat_checksums).c_str());
return false;
}
std::string local_error_msg;
std::string* err_msg = (i == 0 || validate) ? error_msg : &local_error_msg;
std::string base_filename;
if (!filename_fn(base_location, &base_filename, err_msg) ||
!ReadHeader(base_location, base_filename, bcp_index, bcp_component_count, err_msg)) {
if (i == 0u || validate) {
return false;
}
VLOG(image) << "Error reading named image component header for " << base_location
<< ", error: " << local_error_msg;
bcp_pos = bcp_index + 1u; // Skip at least this component.
DCHECK_GT(bcp_pos, GetNextBcpIndex());
continue;
}
if (validate) {
if (!CheckAndRemoveLastChunkChecksum(oat_checksums, error_msg)) {
return false;
}
if (oat_checksums->empty() || !StartsWith(*oat_checksums, "i")) {
return true; // Let the caller deal with the dex file checksums if any.
}
}
bcp_pos = GetNextBcpIndex();
}
// Look for remaining components if there are any wildcard specifications.
ArrayRef<const std::string> search_paths =
ArrayRef<const std::string>(components).SubArray(/*pos=*/ named_components_count);
if (!search_paths.empty()) {
const std::string& primary_base_location = base_locations_and_bcp_indexes[0].first;
size_t base_slash_pos = primary_base_location.rfind('/');
DCHECK_NE(base_slash_pos, std::string::npos);
std::string base_name = primary_base_location.substr(base_slash_pos + 1u);
DCHECK(!base_name.empty());
while (bcp_pos != bcp_component_count) {
const std::string& bcp_component = boot_class_path_[bcp_pos];
bool found = false;
for (const std::string& path : search_paths) {
std::string base_location;
if (path.size() == 1u) {
DCHECK_EQ(path, "*");
size_t slash_pos = bcp_component.rfind('/');
DCHECK_NE(slash_pos, std::string::npos);
base_location = bcp_component.substr(0u, slash_pos + 1u) + base_name;
} else {
DCHECK(EndsWith(path, "/*"));
base_location = path.substr(0u, path.size() - 1u) + base_name;
}
std::string err_msg; // Ignored.
std::string base_filename;
if (filename_fn(base_location, &base_filename, &err_msg) &&
ReadHeader(base_location, base_filename, bcp_pos, bcp_component_count, &err_msg)) {
VLOG(image) << "Found image extension for " << ExpandLocation(base_location, bcp_pos);
bcp_pos = GetNextBcpIndex();
found = true;
if (validate) {
if (!CheckAndRemoveLastChunkChecksum(oat_checksums, error_msg)) {
return false;
}
if (oat_checksums->empty() || !StartsWith(*oat_checksums, "i")) {
return true; // Let the caller deal with the dex file checksums if any.
}
}
break;
}
}
if (!found) {
if (validate) {
*error_msg = StringPrintf("Missing extension for %s, remaining checksum: %s",
bcp_component.c_str(),
std::string(*oat_checksums).c_str());
return false;
}
++bcp_pos;
}
}
}
return true;
}
bool ImageSpace::BootImageLayout::LoadOrValidateFromSystem(InstructionSet image_isa,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
auto filename_fn = [image_isa](const std::string& location,
/*out*/std::string* filename,
/*out*/std::string* err_msg ATTRIBUTE_UNUSED) {
*filename = GetSystemImageFilename(location.c_str(), image_isa);
return true;
};
return LoadOrValidate(filename_fn, oat_checksums, error_msg);
}
bool ImageSpace::BootImageLayout::LoadOrValidateFromDalvikCache(
const std::string& dalvik_cache,
/*inout*/std::string_view* oat_checksums,
/*out*/std::string* error_msg) {
auto filename_fn = [&dalvik_cache](const std::string& location,
/*out*/std::string* filename,
/*out*/std::string* err_msg) {
return GetDalvikCacheFilename(location.c_str(), dalvik_cache.c_str(), filename, err_msg);
};
return LoadOrValidate(filename_fn, oat_checksums, error_msg);
}
class ImageSpace::BootImageLoader {
public:
BootImageLoader(const std::vector<std::string>& boot_class_path,
const std::vector<std::string>& boot_class_path_locations,
const std::string& image_location,
InstructionSet image_isa,
bool relocate,
bool executable,
bool is_zygote)
: boot_class_path_(boot_class_path),
boot_class_path_locations_(boot_class_path_locations),
image_location_(image_location),
image_isa_(image_isa),
relocate_(relocate),
executable_(executable),
is_zygote_(is_zygote),
has_system_(false),
has_cache_(false),
is_global_cache_(true),
dalvik_cache_exists_(false),
dalvik_cache_(),
cache_filename_() {
}
bool IsZygote() const { return is_zygote_; }
void FindImageFiles() {
BootImageLayout layout(image_location_, boot_class_path_);
std::string image_location = layout.GetPrimaryImageLocation();
std::string system_filename;
bool found_image = FindImageFilenameImpl(image_location.c_str(),
image_isa_,
&has_system_,
&system_filename,
&dalvik_cache_exists_,
&dalvik_cache_,
&is_global_cache_,
&has_cache_,
&cache_filename_);
DCHECK(!dalvik_cache_exists_ || !dalvik_cache_.empty());
DCHECK_EQ(found_image, has_system_ || has_cache_);
}
bool HasSystem() const { return has_system_; }
bool HasCache() const { return has_cache_; }
bool DalvikCacheExists() const { return dalvik_cache_exists_; }
bool IsGlobalCache() const { return is_global_cache_; }
const std::string& GetDalvikCache() const {
return dalvik_cache_;
}
const std::string& GetCacheFilename() const {
return cache_filename_;
}
bool LoadFromSystem(bool validate_oat_file,
size_t extra_reservation_size,
/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
/*out*/MemMap* extra_reservation,
/*out*/std::string* error_msg) REQUIRES_SHARED(Locks::mutator_lock_);
bool LoadFromDalvikCache(
bool validate_oat_file,
size_t extra_reservation_size,
/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
/*out*/MemMap* extra_reservation,
/*out*/std::string* error_msg) REQUIRES_SHARED(Locks::mutator_lock_);
private:
bool LoadImage(
const BootImageLayout& layout,
bool validate_oat_file,
size_t extra_reservation_size,
TimingLogger* logger,
/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
/*out*/MemMap* extra_reservation,
/*out*/std::string* error_msg) REQUIRES_SHARED(Locks::mutator_lock_) {
ArrayRef<const BootImageLayout::ImageChunk> chunks = layout.GetChunks();
DCHECK(!chunks.empty());
const uint32_t base_address = layout.GetBaseAddress();
const size_t image_component_count = layout.GetTotalComponentCount();
const size_t image_reservation_size = layout.GetTotalReservationSize();
DCHECK_LE(image_reservation_size, kMaxTotalImageReservationSize);
static_assert(kMaxTotalImageReservationSize < std::numeric_limits<uint32_t>::max());
if (extra_reservation_size > std::numeric_limits<uint32_t>::max() - image_reservation_size) {
// Since the `image_reservation_size` is limited to kMaxTotalImageReservationSize,
// the `extra_reservation_size` would have to be really excessive to fail this check.
*error_msg = StringPrintf("Excessive extra reservation size: %zu", extra_reservation_size);
return false;
}
// Reserve address space. If relocating, choose a random address for ALSR.
uint8_t* addr = reinterpret_cast<uint8_t*>(
relocate_ ? ART_BASE_ADDRESS + ChooseRelocationOffsetDelta() : base_address);
MemMap image_reservation =
ReserveBootImageMemory(addr, image_reservation_size + extra_reservation_size, error_msg);
if (!image_reservation.IsValid()) {
return false;
}
// Load components.
std::vector<std::unique_ptr<ImageSpace>> spaces;
spaces.reserve(image_component_count);
size_t max_image_space_dependencies = 0u;
for (size_t i = 0, num_chunks = chunks.size(); i != num_chunks; ++i) {
const BootImageLayout::ImageChunk& chunk = chunks[i];
std::string extension_error_msg;
uint8_t* old_reservation_begin = image_reservation.Begin();
size_t old_reservation_size = image_reservation.Size();
DCHECK_LE(chunk.reservation_size, old_reservation_size);
if (!LoadComponents(chunk,
validate_oat_file,
max_image_space_dependencies,
logger,
&spaces,
&image_reservation,
(i == 0) ? error_msg : &extension_error_msg)) {
// Failed to load the chunk. If this is the primary boot image, report the error.
if (i == 0) {
return false;
}
// For extension, shrink the reservation (and remap if needed, see below).
size_t new_reservation_size = old_reservation_size - chunk.reservation_size;
if (new_reservation_size == 0u) {
DCHECK_EQ(extra_reservation_size, 0u);
DCHECK_EQ(i + 1u, num_chunks);
image_reservation.Reset();
} else if (old_reservation_begin != image_reservation.Begin()) {
// Part of the image reservation has been used and then unmapped when
// rollling back the partial boot image extension load. Try to remap
// the image reservation. As this should be running single-threaded,
// the address range should still be available to mmap().
image_reservation.Reset();
std::string remap_error_msg;
image_reservation = ReserveBootImageMemory(old_reservation_begin,
new_reservation_size,
&remap_error_msg);
if (!image_reservation.IsValid()) {
*error_msg = StringPrintf("Failed to remap boot image reservation after failing "
"to load boot image extension (%s: %s): %s",
boot_class_path_locations_[chunk.start_index].c_str(),
extension_error_msg.c_str(),
remap_error_msg.c_str());
return false;
}
} else {
DCHECK_EQ(old_reservation_size, image_reservation.Size());
image_reservation.SetSize(new_reservation_size);
}
LOG(ERROR) << "Failed to load boot image extension "
<< boot_class_path_locations_[chunk.start_index] << ": " << extension_error_msg;
}
// Update `max_image_space_dependencies` if all previous BCP components
// were covered and loading the current chunk succeeded.
if (max_image_space_dependencies == chunk.start_index &&
spaces.size() == chunk.start_index + chunk.component_count) {
max_image_space_dependencies = chunk.start_index + chunk.component_count;
}
}
MemMap local_extra_reservation;
if (!RemapExtraReservation(extra_reservation_size,
&image_reservation,
&local_extra_reservation,
error_msg)) {
return false;
}
MaybeRelocateSpaces(spaces, logger);
boot_image_spaces->swap(spaces);
*extra_reservation = std::move(local_extra_reservation);
return true;
}
private:
class SimpleRelocateVisitor {
public:
SimpleRelocateVisitor(uint32_t diff, uint32_t begin, uint32_t size)
: diff_(diff), begin_(begin), size_(size) {}
// Adapter taking the same arguments as SplitRangeRelocateVisitor
// to simplify constructing the various visitors in DoRelocateSpaces().
SimpleRelocateVisitor(uint32_t base_diff,
uint32_t current_diff,
uint32_t bound,
uint32_t begin,
uint32_t size)
: SimpleRelocateVisitor(base_diff, begin, size) {
// Check arguments unused by this class.
DCHECK_EQ(base_diff, current_diff);
DCHECK_EQ(bound, begin);
}
template <typename T>
ALWAYS_INLINE T* operator()(T* src) const {
DCHECK(InSource(src));
uint32_t raw_src = reinterpret_cast32<uint32_t>(src);
return reinterpret_cast32<T*>(raw_src + diff_);
}
template <typename T>
ALWAYS_INLINE bool InSource(T* ptr) const {
uint32_t raw_ptr = reinterpret_cast32<uint32_t>(ptr);
return raw_ptr - begin_ < size_;
}
private:
const uint32_t diff_;
const uint32_t begin_;
const uint32_t size_;
};
class SplitRangeRelocateVisitor {
public:
SplitRangeRelocateVisitor(uint32_t base_diff,
uint32_t current_diff,
uint32_t bound,
uint32_t begin,
uint32_t size)
: base_diff_(base_diff),
current_diff_(current_diff),
bound_(bound),
begin_(begin),
size_(size) {
DCHECK_NE(begin_, bound_);
// The bound separates the boot image range and the extension range.
DCHECK_LT(bound_ - begin_, size_);
}
template <typename T>
ALWAYS_INLINE T* operator()(T* src) const {
DCHECK(InSource(src));
uint32_t raw_src = reinterpret_cast32<uint32_t>(src);
uint32_t diff = (raw_src < bound_) ? base_diff_ : current_diff_;
return reinterpret_cast32<T*>(raw_src + diff);
}
template <typename T>
ALWAYS_INLINE bool InSource(T* ptr) const {
uint32_t raw_ptr = reinterpret_cast32<uint32_t>(ptr);
return raw_ptr - begin_ < size_;
}
private:
const uint32_t base_diff_;
const uint32_t current_diff_;
const uint32_t bound_;
const uint32_t begin_;
const uint32_t size_;
};
static void** PointerAddress(ArtMethod* method, MemberOffset offset) {
return reinterpret_cast<void**>(reinterpret_cast<uint8_t*>(method) + offset.Uint32Value());
}
template <PointerSize kPointerSize>
static void DoRelocateSpaces(ArrayRef<const std::unique_ptr<ImageSpace>>& spaces,
int64_t base_diff64) REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(!spaces.empty());
gc::accounting::ContinuousSpaceBitmap patched_objects(
gc::accounting::ContinuousSpaceBitmap::Create(
"Marked objects",
spaces.front()->Begin(),
spaces.back()->End() - spaces.front()->Begin()));
const ImageHeader& base_header = spaces[0]->GetImageHeader();
size_t base_component_count = base_header.GetComponentCount();
DCHECK_LE(base_component_count, spaces.size());
DoRelocateSpaces<kPointerSize, /*kExtension=*/ false>(
spaces.SubArray(/*pos=*/ 0u, base_component_count),
base_diff64,
&patched_objects);
for (size_t i = base_component_count, size = spaces.size(); i != size; ) {
const ImageHeader& ext_header = spaces[i]->GetImageHeader();
size_t ext_component_count = ext_header.GetComponentCount();
DCHECK_LE(ext_component_count, size - i);
DoRelocateSpaces<kPointerSize, /*kExtension=*/ true>(
spaces.SubArray(/*pos=*/ i, ext_component_count),
base_diff64,
&patched_objects);
i += ext_component_count;
}
}
template <PointerSize kPointerSize, bool kExtension>
static void DoRelocateSpaces(ArrayRef<const std::unique_ptr<ImageSpace>> spaces,
int64_t base_diff64,
gc::accounting::ContinuousSpaceBitmap* patched_objects)
REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(!spaces.empty());
const ImageHeader& first_header = spaces.front()->GetImageHeader();
uint32_t image_begin = reinterpret_cast32<uint32_t>(first_header.GetImageBegin());
uint32_t image_size = first_header.GetImageReservationSize();
DCHECK_NE(image_size, 0u);
uint32_t source_begin = kExtension ? first_header.GetBootImageBegin() : image_begin;
uint32_t source_size = kExtension ? first_header.GetBootImageSize() + image_size : image_size;
if (kExtension) {
DCHECK_EQ(first_header.GetBootImageBegin() + first_header.GetBootImageSize(), image_begin);
}
int64_t current_diff64 = kExtension
? static_cast<int64_t>(reinterpret_cast32<uint32_t>(spaces.front()->Begin())) -
static_cast<int64_t>(image_begin)
: base_diff64;
uint32_t base_diff = static_cast<uint32_t>(base_diff64);
uint32_t current_diff = static_cast<uint32_t>(current_diff64);
// For boot image the main visitor is a SimpleRelocateVisitor. For the boot image extension we
// mostly use a SplitRelocationVisitor but some work can still use the SimpleRelocationVisitor.
using MainRelocateVisitor = typename std::conditional<
kExtension, SplitRangeRelocateVisitor, SimpleRelocateVisitor>::type;
SimpleRelocateVisitor simple_relocate_visitor(current_diff, image_begin, image_size);
MainRelocateVisitor main_relocate_visitor(
base_diff, current_diff, /*bound=*/ image_begin, source_begin, source_size);
using MainPatchRelocateVisitor =
PatchObjectVisitor<kPointerSize, MainRelocateVisitor, MainRelocateVisitor>;
using SimplePatchRelocateVisitor =
PatchObjectVisitor<kPointerSize, SimpleRelocateVisitor, SimpleRelocateVisitor>;
MainPatchRelocateVisitor main_patch_object_visitor(main_relocate_visitor,
main_relocate_visitor);
SimplePatchRelocateVisitor simple_patch_object_visitor(simple_relocate_visitor,
simple_relocate_visitor);
// Retrieve the Class.class, Method.class and Constructor.class needed in the loops below.
ObjPtr<mirror::ObjectArray<mirror::Class>> class_roots;
ObjPtr<mirror::Class> class_class;
ObjPtr<mirror::Class> method_class;
ObjPtr<mirror::Class> constructor_class;
{
ObjPtr<mirror::ObjectArray<mirror::Object>> image_roots =
simple_relocate_visitor(first_header.GetImageRoots<kWithoutReadBarrier>().Ptr());
DCHECK(!patched_objects->Test(image_roots.Ptr()));
SimpleRelocateVisitor base_relocate_visitor(
base_diff,
source_begin,
kExtension ? source_size - image_size : image_size);
int32_t class_roots_index = enum_cast<int32_t>(ImageHeader::kClassRoots);
DCHECK_LT(class_roots_index, image_roots->GetLength<kVerifyNone>());
class_roots = ObjPtr<mirror::ObjectArray<mirror::Class>>::DownCast(base_relocate_visitor(
image_roots->GetWithoutChecks<kVerifyNone>(class_roots_index).Ptr()));
if (kExtension) {
DCHECK(patched_objects->Test(class_roots.Ptr()));
class_class = GetClassRoot<mirror::Class, kWithoutReadBarrier>(class_roots);
method_class = GetClassRoot<mirror::Method, kWithoutReadBarrier>(class_roots);
constructor_class = GetClassRoot<mirror::Constructor, kWithoutReadBarrier>(class_roots);
} else {
DCHECK(!patched_objects->Test(class_roots.Ptr()));
class_class = simple_relocate_visitor(
GetClassRoot<mirror::Class, kWithoutReadBarrier>(class_roots).Ptr());
method_class = simple_relocate_visitor(
GetClassRoot<mirror::Method, kWithoutReadBarrier>(class_roots).Ptr());
constructor_class = simple_relocate_visitor(
GetClassRoot<mirror::Constructor, kWithoutReadBarrier>(class_roots).Ptr());
}
}
for (const std::unique_ptr<ImageSpace>& space : spaces) {
// First patch the image header.
reinterpret_cast<ImageHeader*>(space->Begin())->RelocateImageReferences(current_diff64);
reinterpret_cast<ImageHeader*>(space->Begin())->RelocateBootImageReferences(base_diff64);
// Patch fields and methods.
const ImageHeader& image_header = space->GetImageHeader();
image_header.VisitPackedArtFields([&](ArtField& field) REQUIRES_SHARED(Locks::mutator_lock_) {
// Fields always reference class in the current image.
simple_patch_object_visitor.template PatchGcRoot</*kMayBeNull=*/ false>(
&field.DeclaringClassRoot());
}, space->Begin());
image_header.VisitPackedArtMethods([&](ArtMethod& method)
REQUIRES_SHARED(Locks::mutator_lock_) {
main_patch_object_visitor.PatchGcRoot(&method.DeclaringClassRoot());
void** data_address = PointerAddress(&method, ArtMethod::DataOffset(kPointerSize));
main_patch_object_visitor.PatchNativePointer(data_address);
void** entrypoint_address =
PointerAddress(&method, ArtMethod::EntryPointFromQuickCompiledCodeOffset(kPointerSize));
main_patch_object_visitor.PatchNativePointer(entrypoint_address);
}, space->Begin(), kPointerSize);
auto method_table_visitor = [&](ArtMethod* method) {
DCHECK(method != nullptr);
return main_relocate_visitor(method);
};
image_header.VisitPackedImTables(method_table_visitor, space->Begin(), kPointerSize);
image_header.VisitPackedImtConflictTables(method_table_visitor, space->Begin(), kPointerSize);
// Patch the intern table.
if (image_header.GetInternedStringsSection().Size() != 0u) {
const uint8_t* data = space->Begin() + image_header.GetInternedStringsSection().Offset();
size_t read_count;
InternTable::UnorderedSet temp_set(data, /*make_copy_of_data=*/ false, &read_count);
for (GcRoot<mirror::String>& slot : temp_set) {
// The intern table contains only strings in the current image.
simple_patch_object_visitor.template PatchGcRoot</*kMayBeNull=*/ false>(&slot);
}
}
// Patch the class table and classes, so that we can traverse class hierarchy to
// determine the types of other objects when we visit them later.
if (image_header.GetClassTableSection().Size() != 0u) {
uint8_t* data = space->Begin() + image_header.GetClassTableSection().Offset();
size_t read_count;
ClassTable::ClassSet temp_set(data, /*make_copy_of_data=*/ false, &read_count);
DCHECK(!temp_set.empty());
// The class table contains only classes in the current image.
ClassTableVisitor class_table_visitor(simple_relocate_visitor);
for (ClassTable::TableSlot& slot : temp_set) {
slot.VisitRoot(class_table_visitor);
ObjPtr<mirror::Class> klass = slot.Read<kWithoutReadBarrier>();
DCHECK(klass != nullptr);
DCHECK(!patched_objects->Test(klass.Ptr()));
patched_objects->Set(klass.Ptr());
main_patch_object_visitor.VisitClass(klass, class_class);
// Then patch the non-embedded vtable and iftable.
ObjPtr<mirror::PointerArray> vtable =
klass->GetVTable<kVerifyNone, kWithoutReadBarrier>();
if ((kExtension ? simple_relocate_visitor.InSource(vtable.Ptr()) : vtable != nullptr) &&
!patched_objects->Set(vtable.Ptr())) {
main_patch_object_visitor.VisitPointerArray(vtable);
}
ObjPtr<mirror::IfTable> iftable = klass->GetIfTable<kVerifyNone, kWithoutReadBarrier>();
if (iftable != nullptr) {
int32_t ifcount = klass->GetIfTableCount<kVerifyNone>();
for (int32_t i = 0; i != ifcount; ++i) {
ObjPtr<mirror::PointerArray> unpatched_ifarray =
iftable->GetMethodArrayOrNull<kVerifyNone, kWithoutReadBarrier>(i);
if (kExtension ? simple_relocate_visitor.InSource(unpatched_ifarray.Ptr())
: unpatched_ifarray != nullptr) {
// The iftable has not been patched, so we need to explicitly adjust the pointer.
ObjPtr<mirror::PointerArray> ifarray =
simple_relocate_visitor(unpatched_ifarray.Ptr());
if (!patched_objects->Set(ifarray.Ptr())) {
main_patch_object_visitor.VisitPointerArray(ifarray);
}
}
}
}
}
}
}
for (const std::unique_ptr<ImageSpace>& space : spaces) {
const ImageHeader& image_header = space->GetImageHeader();
static_assert(IsAligned<kObjectAlignment>(sizeof(ImageHeader)), "Header alignment check");
uint32_t objects_end = image_header.GetObjectsSection().Size();
DCHECK_ALIGNED(objects_end, kObjectAlignment);
for (uint32_t pos = sizeof(ImageHeader); pos != objects_end; ) {
mirror::Object* object = reinterpret_cast<mirror::Object*>(space->Begin() + pos);
// Note: use Test() rather than Set() as this is the last time we're checking this object.
if (!patched_objects->Test(object)) {
// This is the last pass over objects, so we do not need to Set().
main_patch_object_visitor.VisitObject(object);
ObjPtr<mirror::Class> klass = object->GetClass<kVerifyNone, kWithoutReadBarrier>();
if (klass->IsDexCacheClass<kVerifyNone>()) {
// Patch dex cache array pointers and elements.
ObjPtr<mirror::DexCache> dex_cache =
object->AsDexCache<kVerifyNone, kWithoutReadBarrier>();
main_patch_object_visitor.VisitDexCacheArrays(dex_cache);
} else if (klass == method_class || klass == constructor_class) {
// Patch the ArtMethod* in the mirror::Executable subobject.
ObjPtr<mirror::Executable> as_executable =
ObjPtr<mirror::Executable>::DownCast(object);
ArtMethod* unpatched_method = as_executable->GetArtMethod<kVerifyNone>();
ArtMethod* patched_method = main_relocate_visitor(unpatched_method);
as_executable->SetArtMethod</*kTransactionActive=*/ false,
/*kCheckTransaction=*/ true,
kVerifyNone>(patched_method);
}
}
pos += RoundUp(object->SizeOf<kVerifyNone>(), kObjectAlignment);
}
}
if (kIsDebugBuild && !kExtension) {
// We used just Test() instead of Set() above but we need to use Set()
// for class roots to satisfy a DCHECK() for extensions.
DCHECK(!patched_objects->Test(class_roots.Ptr()));
patched_objects->Set(class_roots.Ptr());
}
}
void MaybeRelocateSpaces(const std::vector<std::unique_ptr<ImageSpace>>& spaces,
TimingLogger* logger)
REQUIRES_SHARED(Locks::mutator_lock_) {
TimingLogger::ScopedTiming timing("MaybeRelocateSpaces", logger);
ImageSpace* first_space = spaces.front().get();
const ImageHeader& first_space_header = first_space->GetImageHeader();
int64_t base_diff64 =
static_cast<int64_t>(reinterpret_cast32<uint32_t>(first_space->Begin())) -
static_cast<int64_t>(reinterpret_cast32<uint32_t>(first_space_header.GetImageBegin()));
if (!relocate_) {
DCHECK_EQ(base_diff64, 0);
return;
}
ArrayRef<const std::unique_ptr<ImageSpace>> spaces_ref(spaces);
PointerSize pointer_size = first_space_header.GetPointerSize();
if (pointer_size == PointerSize::k64) {
DoRelocateSpaces<PointerSize::k64>(spaces_ref, base_diff64);
} else {
DoRelocateSpaces<PointerSize::k32>(spaces_ref, base_diff64);
}
}
std::unique_ptr<ImageSpace> Load(const std::string& image_location,
const std::string& image_filename,
TimingLogger* logger,
/*inout*/MemMap* image_reservation,
/*out*/std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_) {
// Should this be a RDWR lock? This is only a defensive measure, as at
// this point the image should exist.
// However, only the zygote can write into the global dalvik-cache, so
// restrict to zygote processes, or any process that isn't using
// /data/dalvik-cache (which we assume to be allowed to write there).
const bool rw_lock = is_zygote_ || !is_global_cache_;
// Note that we must not use the file descriptor associated with
// ScopedFlock::GetFile to Init the image file. We want the file
// descriptor (and the associated exclusive lock) to be released when
// we leave Create.
ScopedFlock image = LockedFile::Open(image_filename.c_str(),
/*flags=*/ rw_lock ? (O_CREAT | O_RDWR) : O_RDONLY,
/*block=*/ true,
error_msg);
VLOG(startup) << "Using image file " << image_filename.c_str() << " for image location "
<< image_location;
// If we are in /system we can assume the image is good. We can also
// assume this if we are using a relocated image (i.e. image checksum
// matches) since this is only different by the offset. We need this to
// make sure that host tests continue to work.
// Since we are the boot image, pass null since we load the oat file from the boot image oat
// file name.
return Loader::Init(image_filename.c_str(),
image_location.c_str(),
/*oat_file=*/ nullptr,
logger,
image_reservation,
error_msg);
}
bool OpenOatFile(ImageSpace* space,
const std::string& dex_filename,
bool validate_oat_file,
ArrayRef<const std::unique_ptr<ImageSpace>> available_dependencies,
TimingLogger* logger,
/*inout*/MemMap* image_reservation,
/*out*/std::string* error_msg) {
// VerifyImageAllocations() will be called later in Runtime::Init()
// as some class roots like ArtMethod::java_lang_reflect_ArtMethod_
// and ArtField::java_lang_reflect_ArtField_, which are used from
// Object::SizeOf() which VerifyImageAllocations() calls, are not
// set yet at this point.
DCHECK(image_reservation != nullptr);
std::unique_ptr<OatFile> oat_file;
{
TimingLogger::ScopedTiming timing("OpenOatFile", logger);
std::string oat_filename =
ImageHeader::GetOatLocationFromImageLocation(space->GetImageFilename());
std::string oat_location =
ImageHeader::GetOatLocationFromImageLocation(space->GetImageLocation());
oat_file.reset(OatFile::Open(/*zip_fd=*/ -1,
oat_filename,
oat_location,
executable_,
/*low_4gb=*/ false,
/*abs_dex_location=*/ dex_filename.c_str(),
image_reservation,
error_msg));
if (oat_file == nullptr) {
*error_msg = StringPrintf("Failed to open oat file '%s' referenced from image %s: %s",
oat_filename.c_str(),
space->GetName(),
error_msg->c_str());
return false;
}
const ImageHeader& image_header = space->GetImageHeader();
uint32_t oat_checksum = oat_file->GetOatHeader().GetChecksum();
uint32_t image_oat_checksum = image_header.GetOatChecksum();
if (oat_checksum != image_oat_checksum) {
*error_msg = StringPrintf("Failed to match oat file checksum 0x%x to expected oat checksum"
" 0x%x in image %s",
oat_checksum,
image_oat_checksum,
space->GetName());
return false;
}
const char* oat_boot_class_path =
oat_file->GetOatHeader().GetStoreValueByKey(OatHeader::kBootClassPathKey);
oat_boot_class_path = (oat_boot_class_path != nullptr) ? oat_boot_class_path : "";
const char* oat_boot_class_path_checksums =
oat_file->GetOatHeader().GetStoreValueByKey(OatHeader::kBootClassPathChecksumsKey);
oat_boot_class_path_checksums =
(oat_boot_class_path_checksums != nullptr) ? oat_boot_class_path_checksums : "";
size_t component_count = image_header.GetComponentCount();
if (component_count == 0u) {
if (oat_boot_class_path[0] != 0 || oat_boot_class_path_checksums[0] != 0) {
*error_msg = StringPrintf("Unexpected non-empty boot class path %s and/or checksums %s"
" in image %s",
oat_boot_class_path,
oat_boot_class_path_checksums,
space->GetName());
return false;
}
} else if (available_dependencies.empty()) {
std::string expected_boot_class_path = android::base::Join(ArrayRef<const std::string>(
boot_class_path_locations_).SubArray(0u, component_count), ':');
if (expected_boot_class_path != oat_boot_class_path) {
*error_msg = StringPrintf("Failed to match oat boot class path %s to expected "
"boot class path %s in image %s",
oat_boot_class_path,
expected_boot_class_path.c_str(),
space->GetName());
return false;
}
} else {
std::string local_error_msg;
if (!VerifyBootClassPathChecksums(
oat_boot_class_path_checksums,
oat_boot_class_path,
available_dependencies,
ArrayRef<const std::string>(boot_class_path_locations_),
ArrayRef<const std::string>(boot_class_path_),
&local_error_msg)) {
*error_msg = StringPrintf("Failed to verify BCP %s with checksums %s in image %s: %s",
oat_boot_class_path,
oat_boot_class_path_checksums,
space->GetName(),
local_error_msg.c_str());
return false;
}
}
ptrdiff_t relocation_diff = space->Begin() - image_header.GetImageBegin();
CHECK(image_header.GetOatDataBegin() != nullptr);
uint8_t* oat_data_begin = image_header.GetOatDataBegin() + relocation_diff;
if (oat_file->Begin() != oat_data_begin) {
*error_msg = StringPrintf("Oat file '%s' referenced from image %s has unexpected begin"
" %p v. %p",
oat_filename.c_str(),
space->GetName(),
oat_file->Begin(),
oat_data_begin);
return false;
}
}
if (validate_oat_file) {
TimingLogger::ScopedTiming timing("ValidateOatFile", logger);
if (!ImageSpace::ValidateOatFile(*oat_file, error_msg)) {
DCHECK(!error_msg->empty());
return false;
}
}
space->oat_file_ = std::move(oat_file);
space->oat_file_non_owned_ = space->oat_file_.get();
return true;
}
bool LoadComponents(const BootImageLayout::ImageChunk& chunk,
bool validate_oat_file,
size_t max_image_space_dependencies,
TimingLogger* logger,
/*inout*/std::vector<std::unique_ptr<ImageSpace>>* spaces,
/*inout*/MemMap* image_reservation,
/*out*/std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_) {
// Make sure we destroy the spaces we created if we're returning an error.
// Note that this can unmap part of the original `image_reservation`.
class Guard {
public:
explicit Guard(std::vector<std::unique_ptr<ImageSpace>>* spaces_in)
: spaces_(spaces_in), committed_(spaces_->size()) {}
void Commit() {
DCHECK_LT(committed_, spaces_->size());
committed_ = spaces_->size();
}
~Guard() {
DCHECK_LE(committed_, spaces_->size());
spaces_->resize(committed_);
}
private:
std::vector<std::unique_ptr<ImageSpace>>* const spaces_;
size_t committed_;
};
Guard guard(spaces);
bool is_extension = (chunk.start_index != 0u);
DCHECK_NE(spaces->empty(), is_extension);
ArrayRef<const std::string> requested_bcp_locations =
ArrayRef<const std::string>(boot_class_path_locations_).SubArray(
chunk.start_index, chunk.component_count);
std::vector<std::string> locations =
ExpandMultiImageLocations(requested_bcp_locations, chunk.base_location, is_extension);
std::vector<std::string> filenames =
ExpandMultiImageLocations(requested_bcp_locations, chunk.base_filename, is_extension);
DCHECK_EQ(locations.size(), filenames.size());
for (std::size_t i = 0u, size = locations.size(); i != size; ++i) {
spaces->push_back(Load(locations[i], filenames[i], logger, image_reservation, error_msg));
const ImageSpace* space = spaces->back().get();
if (space == nullptr) {
return false;
}
uint32_t expected_component_count = (i == 0u) ? chunk.component_count : 0u;
uint32_t expected_reservation_size = (i == 0u) ? chunk.reservation_size : 0u;
if (!Loader::CheckImageReservationSize(*space, expected_reservation_size, error_msg) ||
!Loader::CheckImageComponentCount(*space, expected_component_count, error_msg)) {
return false;
}
if (i == 0 && chunk.checksum != space->GetImageHeader().GetImageChecksum()) {
*error_msg = StringPrintf("Image checksum modified since previously read from %s, "
"received %u, expected %u",
space->GetImageFilename().c_str(),
space->GetImageHeader().GetImageChecksum(),
chunk.checksum);
return false;
}
}
ArrayRef<const std::unique_ptr<ImageSpace>> available_dependencies =
ArrayRef<const std::unique_ptr<ImageSpace>>(*spaces).SubArray(/*pos=*/ 0u,
max_image_space_dependencies);
for (std::size_t i = 0u, size = locations.size(); i != size; ++i) {
ImageSpace* space = (*spaces)[spaces->size() - chunk.component_count + i].get();
if (!OpenOatFile(space,
boot_class_path_[chunk.start_index + i],
validate_oat_file,
available_dependencies,
logger,
image_reservation,
error_msg)) {
return false;
}
}
guard.Commit();
return true;
}
MemMap ReserveBootImageMemory(uint8_t* addr,
uint32_t reservation_size,
/*out*/std::string* error_msg) {
DCHECK_ALIGNED(reservation_size, kPageSize);
DCHECK_ALIGNED(addr, kPageSize);
return MemMap::MapAnonymous("Boot image reservation",
addr,
reservation_size,
PROT_NONE,
/*low_4gb=*/ true,
/*reuse=*/ false,
/*reservation=*/ nullptr,
error_msg);
}
bool RemapExtraReservation(size_t extra_reservation_size,
/*inout*/MemMap* image_reservation,
/*out*/MemMap* extra_reservation,
/*out*/std::string* error_msg) {
DCHECK_ALIGNED(extra_reservation_size, kPageSize);
DCHECK(!extra_reservation->IsValid());
size_t expected_size = image_reservation->IsValid() ? image_reservation->Size() : 0u;
if (extra_reservation_size != expected_size) {
*error_msg = StringPrintf("Image reservation mismatch after loading boot image: %zu != %zu",
extra_reservation_size,
expected_size);
return false;
}
if (extra_reservation_size != 0u) {
DCHECK(image_reservation->IsValid());
DCHECK_EQ(extra_reservation_size, image_reservation->Size());
*extra_reservation = image_reservation->RemapAtEnd(image_reservation->Begin(),
"Boot image extra reservation",
PROT_NONE,
error_msg);
if (!extra_reservation->IsValid()) {
return false;
}
}
DCHECK(!image_reservation->IsValid());
return true;
}
const ArrayRef<const std::string> boot_class_path_;
const ArrayRef<const std::string> boot_class_path_locations_;
const std::string image_location_;
const InstructionSet image_isa_;
const bool relocate_;
const bool executable_;
const bool is_zygote_;
bool has_system_;
bool has_cache_;
bool is_global_cache_;
bool dalvik_cache_exists_;
std::string dalvik_cache_;
std::string cache_filename_;
};
bool ImageSpace::BootImageLoader::LoadFromSystem(
bool validate_oat_file,
size_t extra_reservation_size,
/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
/*out*/MemMap* extra_reservation,
/*out*/std::string* error_msg) {
TimingLogger logger(__PRETTY_FUNCTION__, /*precise=*/ true, VLOG_IS_ON(image));
BootImageLayout layout(image_location_, boot_class_path_);
if (!layout.LoadFromSystem(image_isa_, error_msg)) {
return false;
}
if (!LoadImage(layout,
validate_oat_file,
extra_reservation_size,
&logger,
boot_image_spaces,
extra_reservation,
error_msg)) {
return false;
}
if (VLOG_IS_ON(image)) {
LOG(INFO) << "ImageSpace::BootImageLoader::LoadFromSystem exiting "
<< boot_image_spaces->front();
logger.Dump(LOG_STREAM(INFO));
}
return true;
}
bool ImageSpace::BootImageLoader::LoadFromDalvikCache(
bool validate_oat_file,
size_t extra_reservation_size,
/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
/*out*/MemMap* extra_reservation,
/*out*/std::string* error_msg) {
TimingLogger logger(__PRETTY_FUNCTION__, /*precise=*/ true, VLOG_IS_ON(image));
DCHECK(DalvikCacheExists());
BootImageLayout layout(image_location_, boot_class_path_);
if (!layout.LoadFromDalvikCache(dalvik_cache_, error_msg)) {
return false;
}
if (!LoadImage(layout,
validate_oat_file,
extra_reservation_size,
&logger,
boot_image_spaces,
extra_reservation,
error_msg)) {
return false;
}
if (VLOG_IS_ON(image)) {
LOG(INFO) << "ImageSpace::BootImageLoader::LoadFromDalvikCache exiting "
<< boot_image_spaces->front();
logger.Dump(LOG_STREAM(INFO));
}
return true;
}
static constexpr uint64_t kLowSpaceValue = 50 * MB;
static constexpr uint64_t kTmpFsSentinelValue = 384 * MB;
// Read the free space of the cache partition and make a decision whether to keep the generated
// image. This is to try to mitigate situations where the system might run out of space later.
static bool CheckSpace(const std::string& cache_filename, std::string* error_msg) {
// Using statvfs vs statvfs64 because of b/18207376, and it is enough for all practical purposes.
struct statvfs buf;
int res = TEMP_FAILURE_RETRY(statvfs(cache_filename.c_str(), &buf));
if (res != 0) {
// Could not stat. Conservatively tell the system to delete the image.
*error_msg = "Could not stat the filesystem, assuming low-memory situation.";
return false;
}
uint64_t fs_overall_size = buf.f_bsize * static_cast<uint64_t>(buf.f_blocks);
// Zygote is privileged, but other things are not. Use bavail.
uint64_t fs_free_size = buf.f_bsize * static_cast<uint64_t>(buf.f_bavail);
// Take the overall size as an indicator for a tmpfs, which is being used for the decryption
// environment. We do not want to fail quickening the boot image there, as it is beneficial
// for time-to-UI.
if (fs_overall_size > kTmpFsSentinelValue) {
if (fs_free_size < kLowSpaceValue) {
*error_msg = StringPrintf("Low-memory situation: only %4.2f megabytes available, need at "
"least %" PRIu64 ".",
static_cast<double>(fs_free_size) / MB,
kLowSpaceValue / MB);
return false;
}
}
return true;
}
bool ImageSpace::LoadBootImage(
const std::vector<std::string>& boot_class_path,
const std::vector<std::string>& boot_class_path_locations,
const std::string& image_location,
const InstructionSet image_isa,
ImageSpaceLoadingOrder order,
bool relocate,
bool executable,
bool is_zygote,
size_t extra_reservation_size,
/*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
/*out*/MemMap* extra_reservation) {
ScopedTrace trace(__FUNCTION__);
DCHECK(boot_image_spaces != nullptr);
DCHECK(boot_image_spaces->empty());
DCHECK_ALIGNED(extra_reservation_size, kPageSize);
DCHECK(extra_reservation != nullptr);
DCHECK_NE(image_isa, InstructionSet::kNone);
if (image_location.empty()) {
return false;
}
BootImageLoader loader(boot_class_path,
boot_class_path_locations,
image_location,
image_isa,
relocate,
executable,
is_zygote);
// Step 0: Extra zygote work.
// Step 0.a: If we're the zygote, mark boot.
if (loader.IsZygote() && CanWriteToDalvikCache(image_isa)) {
MarkZygoteStart(image_isa, Runtime::Current()->GetZygoteMaxFailedBoots());
}
loader.FindImageFiles();
// Step 0.b: If we're the zygote, check for free space, and prune the cache preemptively,
// if necessary. While the runtime may be fine (it is pretty tolerant to
// out-of-disk-space situations), other parts of the platform are not.
//
// The advantage of doing this proactively is that the later steps are simplified,
// i.e., we do not need to code retries.
bool low_space = false;
if (loader.IsZygote() && loader.DalvikCacheExists()) {
// Extra checks for the zygote. These only apply when loading the first image, explained below.
const std::string& dalvik_cache = loader.GetDalvikCache();
DCHECK(!dalvik_cache.empty());
std::string local_error_msg;
bool check_space = CheckSpace(dalvik_cache, &local_error_msg);
if (!check_space) {
LOG(WARNING) << local_error_msg << " Preemptively pruning the dalvik cache.";
PruneDalvikCache(image_isa);
// Re-evaluate the image.
loader.FindImageFiles();
// Disable compilation/patching - we do not want to fill up the space again.
low_space = true;
}
}
// Collect all the errors.
std::vector<std::string> error_msgs;
auto try_load_from = [&](auto has_fn, auto load_fn, bool validate_oat_file) {
if ((loader.*has_fn)()) {
std::string local_error_msg;
if ((loader.*load_fn)(validate_oat_file,
extra_reservation_size,
boot_image_spaces,
extra_reservation,
&local_error_msg)) {
return true;
}
error_msgs.push_back(local_error_msg);
}
return false;
};
auto try_load_from_system = [&]() {
// Validate the oat files if the loading order checks data first. Otherwise assume system
// integrity.
return try_load_from(&BootImageLoader::HasSystem,
&BootImageLoader::LoadFromSystem,
/*validate_oat_file=*/ order != ImageSpaceLoadingOrder::kSystemFirst);
};
auto try_load_from_cache = [&]() {
// Always validate oat files from the dalvik cache.
return try_load_from(&BootImageLoader::HasCache,
&BootImageLoader::LoadFromDalvikCache,
/*validate_oat_file=*/ true);
};
auto invoke_sequentially = [](auto first, auto second) {
return first() || second();
};
// Step 1+2: Check system and cache images in the asked-for order.
if (order == ImageSpaceLoadingOrder::kSystemFirst) {
if (invoke_sequentially(try_load_from_system, try_load_from_cache)) {
return true;
}
} else {
if (invoke_sequentially(try_load_from_cache, try_load_from_system)) {
return true;
}
}
// Step 3: We do not have an existing image in /system,
// so generate an image into the dalvik cache.
if (!loader.HasSystem() && loader.DalvikCacheExists()) {
std::string local_error_msg;
if (low_space || !Runtime::Current()->IsImageDex2OatEnabled()) {
local_error_msg = "Image compilation disabled.";
} else if (ImageCreationAllowed(loader.IsGlobalCache(),
image_isa,
is_zygote,
&local_error_msg)) {
bool compilation_success =
GenerateImage(loader.GetCacheFilename(), image_isa, &local_error_msg);
if (compilation_success) {
if (loader.LoadFromDalvikCache(/*validate_oat_file=*/ false,
extra_reservation_size,
boot_image_spaces,
extra_reservation,
&local_error_msg)) {
return true;
}
}
}
error_msgs.push_back(StringPrintf("Cannot compile image to %s: %s",
loader.GetCacheFilename().c_str(),
local_error_msg.c_str()));
}
// We failed. Prune the cache the free up space, create a compound error message
// and return false.
if (loader.DalvikCacheExists()) {
PruneDalvikCache(image_isa);
}
std::ostringstream oss;
bool first = true;
for (const auto& msg : error_msgs) {
if (!first) {
oss << "\n ";
}
oss << msg;
}
LOG(ERROR) << "Could not create image space with image file '" << image_location << "'. "
<< "Attempting to fall back to imageless running. Error was: " << oss.str();
return false;
}
ImageSpace::~ImageSpace() {
// Everything done by member destructors. Classes forward-declared in header are now defined.
}
std::unique_ptr<ImageSpace> ImageSpace::CreateFromAppImage(const char* image,
const OatFile* oat_file,
std::string* error_msg) {
// Note: The oat file has already been validated.
return Loader::InitAppImage(image,
image,
oat_file,
/*image_reservation=*/ nullptr,
error_msg);
}
const OatFile* ImageSpace::GetOatFile() const {
return oat_file_non_owned_;
}
std::unique_ptr<const OatFile> ImageSpace::ReleaseOatFile() {
CHECK(oat_file_ != nullptr);
return std::move(oat_file_);
}
void ImageSpace::Dump(std::ostream& os) const {
os << GetType()
<< " begin=" << reinterpret_cast<void*>(Begin())
<< ",end=" << reinterpret_cast<void*>(End())
<< ",size=" << PrettySize(Size())
<< ",name=\"" << GetName() << "\"]";
}
bool ImageSpace::ValidateOatFile(const OatFile& oat_file, std::string* error_msg) {
const ArtDexFileLoader dex_file_loader;
for (const OatDexFile* oat_dex_file : oat_file.GetOatDexFiles()) {
const std::string& dex_file_location = oat_dex_file->GetDexFileLocation();
// Skip multidex locations - These will be checked when we visit their
// corresponding primary non-multidex location.
if (DexFileLoader::IsMultiDexLocation(dex_file_location.c_str())) {
continue;
}
std::vector<uint32_t> checksums;
if (!dex_file_loader.GetMultiDexChecksums(dex_file_location.c_str(), &checksums, error_msg)) {
*error_msg = StringPrintf("ValidateOatFile failed to get checksums of dex file '%s' "
"referenced by oat file %s: %s",
dex_file_location.c_str(),
oat_file.GetLocation().c_str(),
error_msg->c_str());
return false;
}
CHECK(!checksums.empty());
if (checksums[0] != oat_dex_file->GetDexFileLocationChecksum()) {
*error_msg = StringPrintf("ValidateOatFile found checksum mismatch between oat file "
"'%s' and dex file '%s' (0x%x != 0x%x)",
oat_file.GetLocation().c_str(),
dex_file_location.c_str(),
oat_dex_file->GetDexFileLocationChecksum(),
checksums[0]);
return false;
}
// Verify checksums for any related multidex entries.
for (size_t i = 1; i < checksums.size(); i++) {
std::string multi_dex_location = DexFileLoader::GetMultiDexLocation(
i,
dex_file_location.c_str());
const OatDexFile* multi_dex = oat_file.GetOatDexFile(multi_dex_location.c_str(),
nullptr,
error_msg);
if (multi_dex == nullptr) {
*error_msg = StringPrintf("ValidateOatFile oat file '%s' is missing entry '%s'",
oat_file.GetLocation().c_str(),
multi_dex_location.c_str());
return false;
}
if (checksums[i] != multi_dex->GetDexFileLocationChecksum()) {
*error_msg = StringPrintf("ValidateOatFile found checksum mismatch between oat file "
"'%s' and dex file '%s' (0x%x != 0x%x)",
oat_file.GetLocation().c_str(),
multi_dex_location.c_str(),
multi_dex->GetDexFileLocationChecksum(),
checksums[i]);
return false;
}
}
}
return true;
}
std::string ImageSpace::GetBootClassPathChecksums(
ArrayRef<ImageSpace* const> image_spaces,
ArrayRef<const DexFile* const> boot_class_path) {
DCHECK(!boot_class_path.empty());
size_t bcp_pos = 0u;
std::string boot_image_checksum;
for (size_t image_pos = 0u, size = image_spaces.size(); image_pos != size; ) {
const ImageSpace* main_space = image_spaces[image_pos];
// Caller must make sure that the image spaces correspond to the head of the BCP.
DCHECK_NE(main_space->oat_file_non_owned_->GetOatDexFiles().size(), 0u);
DCHECK_EQ(main_space->oat_file_non_owned_->GetOatDexFiles()[0]->GetDexFileLocation(),
boot_class_path[bcp_pos]->GetLocation());
const ImageHeader& current_header = main_space->GetImageHeader();
uint32_t component_count = current_header.GetComponentCount();
DCHECK_NE(component_count, 0u);
DCHECK_LE(component_count, image_spaces.size() - image_pos);
if (image_pos != 0u) {
boot_image_checksum += ':';
}
AppendImageChecksum(component_count, current_header.GetImageChecksum(), &boot_image_checksum);
for (size_t component_index = 0; component_index != component_count; ++component_index) {
const ImageSpace* space = image_spaces[image_pos + component_index];
const OatFile* oat_file = space->oat_file_non_owned_;
size_t num_dex_files = oat_file->GetOatDexFiles().size();
if (kIsDebugBuild) {
CHECK_NE(num_dex_files, 0u);
CHECK_LE(oat_file->GetOatDexFiles().size(), boot_class_path.size() - bcp_pos);
for (size_t i = 0; i != num_dex_files; ++i) {
CHECK_EQ(oat_file->GetOatDexFiles()[i]->GetDexFileLocation(),
boot_class_path[bcp_pos + i]->GetLocation());
}
}
bcp_pos += num_dex_files;
}
image_pos += component_count;
}
ArrayRef<const DexFile* const> boot_class_path_tail =
ArrayRef<const DexFile* const>(boot_class_path).SubArray(bcp_pos);
DCHECK(boot_class_path_tail.empty() ||
!DexFileLoader::IsMultiDexLocation(boot_class_path_tail.front()->GetLocation().c_str()));
for (const DexFile* dex_file : boot_class_path_tail) {
if (!DexFileLoader::IsMultiDexLocation(dex_file->GetLocation().c_str())) {
if (!boot_image_checksum.empty()) {
boot_image_checksum += ':';
}
boot_image_checksum += kDexFileChecksumPrefix;
}
StringAppendF(&boot_image_checksum, "/%08x", dex_file->GetLocationChecksum());
}
return boot_image_checksum;
}
static size_t CheckAndCountBCPComponents(std::string_view oat_boot_class_path,
ArrayRef<const std::string> boot_class_path,
/*out*/std::string* error_msg) {
// Check that the oat BCP is a prefix of current BCP locations and count components.
size_t component_count = 0u;
std::string_view remaining_bcp(oat_boot_class_path);
bool bcp_ok = false;
for (const std::string& location : boot_class_path) {
if (!StartsWith(remaining_bcp, location)) {
break;
}
remaining_bcp.remove_prefix(location.size());
++component_count;
if (remaining_bcp.empty()) {
bcp_ok = true;
break;
}
if (!StartsWith(remaining_bcp, ":")) {
break;
}
remaining_bcp.remove_prefix(1u);
}
if (!bcp_ok) {
*error_msg = StringPrintf("Oat boot class path (%s) is not a prefix of"
" runtime boot class path (%s)",
std::string(oat_boot_class_path).c_str(),
android::base::Join(boot_class_path, ':').c_str());
return static_cast<size_t>(-1);
}
return component_count;
}
bool ImageSpace::VerifyBootClassPathChecksums(std::string_view oat_checksums,
std::string_view oat_boot_class_path,
const std::string& image_location,
ArrayRef<const std::string> boot_class_path_locations,
ArrayRef<const std::string> boot_class_path,
InstructionSet image_isa,
ImageSpaceLoadingOrder order,
/*out*/std::string* error_msg) {
if (oat_checksums.empty() || oat_boot_class_path.empty()) {
*error_msg = oat_checksums.empty() ? "Empty checksums." : "Empty boot class path.";
return false;
}
DCHECK_EQ(boot_class_path_locations.size(), boot_class_path.size());
size_t bcp_size =
CheckAndCountBCPComponents(oat_boot_class_path, boot_class_path_locations, error_msg);
if (bcp_size == static_cast<size_t>(-1)) {
DCHECK(!error_msg->empty());
return false;
}
size_t bcp_pos = 0u;
if (StartsWith(oat_checksums, "i")) {
// Use only the matching part of the BCP for validation.
BootImageLayout layout(image_location, boot_class_path.SubArray(/*pos=*/ 0u, bcp_size));
std::string primary_image_location = layout.GetPrimaryImageLocation();
std::string system_filename;
bool has_system = false;
std::string cache_filename;
bool has_cache = false;
bool dalvik_cache_exists = false;
bool is_global_cache = false;
if (!FindImageFilename(primary_image_location.c_str(),
image_isa,
&system_filename,
&has_system,
&cache_filename,
&dalvik_cache_exists,
&has_cache,
&is_global_cache)) {
*error_msg = StringPrintf("Unable to find image file for %s and %s",
image_location.c_str(),
GetInstructionSetString(image_isa));
return false;
}
DCHECK(has_system || has_cache);
bool use_system = (order == ImageSpaceLoadingOrder::kSystemFirst) ? has_system : !has_cache;
bool image_checksums_ok = use_system
? layout.ValidateFromSystem(image_isa, &oat_checksums, error_msg)
: layout.ValidateFromDalvikCache(cache_filename, &oat_checksums, error_msg);
if (!image_checksums_ok) {
return false;
}
bcp_pos = layout.GetNextBcpIndex();
}
for ( ; bcp_pos != bcp_size; ++bcp_pos) {
static_assert(ImageSpace::kDexFileChecksumPrefix == 'd', "Format prefix check.");
if (!StartsWith(oat_checksums, "d")) {
*error_msg = StringPrintf("Missing dex checksums, expected %s to start with 'd'",
std::string(oat_checksums).c_str());
return false;
}
oat_checksums.remove_prefix(1u);
const std::string& bcp_filename = boot_class_path[bcp_pos];
std::vector<std::unique_ptr<const DexFile>> dex_files;
const ArtDexFileLoader dex_file_loader;
if (!dex_file_loader.Open(bcp_filename.c_str(),
bcp_filename, // The location does not matter here.
/*verify=*/ false,
/*verify_checksum=*/ false,
error_msg,
&dex_files)) {
return false;
}
DCHECK(!dex_files.empty());
for (const std::unique_ptr<const DexFile>& dex_file : dex_files) {
std::string dex_file_checksum = StringPrintf("/%08x", dex_file->GetLocationChecksum());
if (!StartsWith(oat_checksums, dex_file_checksum)) {
*error_msg = StringPrintf("Dex checksum mismatch, expected %s to start with %s",
std::string(oat_checksums).c_str(),
dex_file_checksum.c_str());
return false;
}
oat_checksums.remove_prefix(dex_file_checksum.size());
}
if (bcp_pos + 1u != bcp_size) {
if (!StartsWith(oat_checksums, ":")) {
*error_msg = StringPrintf("Missing ':' separator at start of %s",
std::string(oat_checksums).c_str());
return false;
}
}
}
if (!oat_checksums.empty()) {
*error_msg = StringPrintf("Checksum too long, unexpected tail %s",
std::string(oat_checksums).c_str());
return false;
}
return true;
}
bool ImageSpace::VerifyBootClassPathChecksums(
std::string_view oat_checksums,
std::string_view oat_boot_class_path,
ArrayRef<const std::unique_ptr<ImageSpace>> image_spaces,
ArrayRef<const std::string> boot_class_path_locations,
ArrayRef<const std::string> boot_class_path,
/*out*/std::string* error_msg) {
DCHECK_EQ(boot_class_path.size(), boot_class_path_locations.size());
DCHECK_GE(boot_class_path_locations.size(), image_spaces.size());
if (oat_checksums.empty() || oat_boot_class_path.empty()) {
*error_msg = oat_checksums.empty() ? "Empty checksums." : "Empty boot class path.";
return false;
}
size_t oat_bcp_size =
CheckAndCountBCPComponents(oat_boot_class_path, boot_class_path_locations, error_msg);
if (oat_bcp_size == static_cast<size_t>(-1)) {
DCHECK(!error_msg->empty());
return false;
}
// Verify image checksums.
size_t image_pos = 0u;
while (image_pos != image_spaces.size() && StartsWith(oat_checksums, "i")) {
// Verify the current image checksum.
const ImageHeader& current_header = image_spaces[image_pos]->GetImageHeader();
uint32_t component_count = current_header.GetComponentCount();
DCHECK_NE(component_count, 0u);
DCHECK_LE(component_count, image_spaces.size() - image_pos);
uint32_t checksum = current_header.GetImageChecksum();
if (!CheckAndRemoveImageChecksum(component_count, checksum, &oat_checksums, error_msg)) {
DCHECK(!error_msg->empty());
return false;
}
if (kIsDebugBuild) {
for (size_t component_index = 0; component_index != component_count; ++component_index) {
const OatFile* oat_file = image_spaces[image_pos + component_index]->oat_file_non_owned_;
size_t num_dex_files = oat_file->GetOatDexFiles().size();
CHECK_NE(num_dex_files, 0u);
const std::string main_location = oat_file->GetOatDexFiles()[0]->GetDexFileLocation();
// TODO: Get rid of the weird ResolveRelativeEncodedDexLocation() stuff from oat_file.cc
// and enable this check:
// CHECK_EQ(main_location, boot_class_path_locations[image_pos + component_index]);
CHECK(!DexFileLoader::IsMultiDexLocation(main_location.c_str()));
for (size_t i = 1u; i != num_dex_files; ++i) {
CHECK(DexFileLoader::IsMultiDexLocation(
oat_file->GetOatDexFiles()[i]->GetDexFileLocation().c_str()));
}
}
}
image_pos += component_count;
if (!StartsWith(oat_checksums, ":")) {
// Check that we've reached the end of checksums and BCP.
if (!oat_checksums.empty()) {
*error_msg = StringPrintf("Expected ':' separator or end of checksums, remaining %s.",
std::string(oat_checksums).c_str());
return false;
}
if (image_pos != oat_bcp_size) {
*error_msg = StringPrintf("Component count mismatch between checksums (%zu) and BCP (%zu)",
image_pos,
oat_bcp_size);
return false;
}
return true;
}
oat_checksums.remove_prefix(1u);
}
// We do not allow dependencies of extensions on dex files. That would require
// interleaving the loading of the images with opening the other BCP dex files.
return false;
}
std::vector<std::string> ImageSpace::ExpandMultiImageLocations(
ArrayRef<const std::string> dex_locations,
const std::string& image_location,
bool boot_image_extension) {
DCHECK(!dex_locations.empty());
// Find the path.
size_t last_slash = image_location.rfind('/');
CHECK_NE(last_slash, std::string::npos);
// We also need to honor path components that were encoded through '@'. Otherwise the loading
// code won't be able to find the images.
if (image_location.find('@', last_slash) != std::string::npos) {
last_slash = image_location.rfind('@');
}
// Find the dot separating the primary image name from the extension.
size_t last_dot = image_location.rfind('.');
// Extract the extension and base (the path and primary image name).
std::string extension;
std::string base = image_location;
if (last_dot != std::string::npos && last_dot > last_slash) {
extension = image_location.substr(last_dot); // Including the dot.
base.resize(last_dot);
}
// For non-empty primary image name, add '-' to the `base`.
if (last_slash + 1u != base.size()) {
base += '-';
}
std::vector<std::string> locations;
locations.reserve(dex_locations.size());
size_t start_index = 0u;
if (!boot_image_extension) {
start_index = 1u;
locations.push_back(image_location);
}
// Now create the other names. Use a counted loop to skip the first one if needed.
for (size_t i = start_index; i < dex_locations.size(); ++i) {
// Replace path with `base` (i.e. image path and prefix) and replace the original
// extension (if any) with `extension`.
std::string name = dex_locations[i];
size_t last_dex_slash = name.rfind('/');
if (last_dex_slash != std::string::npos) {
name = name.substr(last_dex_slash + 1);
}
size_t last_dex_dot = name.rfind('.');
if (last_dex_dot != std::string::npos) {
name.resize(last_dex_dot);
}
locations.push_back(base + name + extension);
}
return locations;
}
void ImageSpace::DumpSections(std::ostream& os) const {
const uint8_t* base = Begin();
const ImageHeader& header = GetImageHeader();
for (size_t i = 0; i < ImageHeader::kSectionCount; ++i) {
auto section_type = static_cast<ImageHeader::ImageSections>(i);
const ImageSection& section = header.GetImageSection(section_type);
os << section_type << " " << reinterpret_cast<const void*>(base + section.Offset())
<< "-" << reinterpret_cast<const void*>(base + section.End()) << "\n";
}
}
void ImageSpace::DisablePreResolvedStrings() {
// Clear dex cache pointers.
ObjPtr<mirror::ObjectArray<mirror::DexCache>> dex_caches =
GetImageHeader().GetImageRoot(ImageHeader::kDexCaches)->AsObjectArray<mirror::DexCache>();
for (size_t len = dex_caches->GetLength(), i = 0; i < len; ++i) {
ObjPtr<mirror::DexCache> dex_cache = dex_caches->Get(i);
dex_cache->ClearPreResolvedStrings();
}
}
void ImageSpace::ReleaseMetadata() {
const ImageSection& metadata = GetImageHeader().GetMetadataSection();
VLOG(image) << "Releasing " << metadata.Size() << " image metadata bytes";
// In the case where new app images may have been added around the checkpoint, ensure that we
// don't madvise the cache for these.
ObjPtr<mirror::ObjectArray<mirror::DexCache>> dex_caches =
GetImageHeader().GetImageRoot(ImageHeader::kDexCaches)->AsObjectArray<mirror::DexCache>();
bool have_startup_cache = false;
for (size_t len = dex_caches->GetLength(), i = 0; i < len; ++i) {
ObjPtr<mirror::DexCache> dex_cache = dex_caches->Get(i);
if (dex_cache->NumPreResolvedStrings() != 0u) {
have_startup_cache = true;
}
}
// Only safe to do for images that have their preresolved strings caches disabled. This is because
// uncompressed images madvise to the original unrelocated image contents.
if (!have_startup_cache) {
// Avoid using ZeroAndReleasePages since the zero fill might not be word atomic.
uint8_t* const page_begin = AlignUp(Begin() + metadata.Offset(), kPageSize);
uint8_t* const page_end = AlignDown(Begin() + metadata.End(), kPageSize);
if (page_begin < page_end) {
CHECK_NE(madvise(page_begin, page_end - page_begin, MADV_DONTNEED), -1) << "madvise failed";
}
}
}
} // namespace space
} // namespace gc
} // namespace art