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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/profile-generator-inl.h"
namespace v8 {
namespace internal {
class AllocationTracker;
class AllocationTraceNode;
class HeapEntry;
class HeapSnapshot;
class SnapshotFiller;
class HeapGraphEdge BASE_EMBEDDED {
enum Type {
kContextVariable = v8::HeapGraphEdge::kContextVariable,
kElement = v8::HeapGraphEdge::kElement,
kProperty = v8::HeapGraphEdge::kProperty,
kInternal = v8::HeapGraphEdge::kInternal,
kHidden = v8::HeapGraphEdge::kHidden,
kShortcut = v8::HeapGraphEdge::kShortcut,
kWeak = v8::HeapGraphEdge::kWeak
HeapGraphEdge() { }
HeapGraphEdge(Type type, const char* name, int from, int to);
HeapGraphEdge(Type type, int index, int from, int to);
void ReplaceToIndexWithEntry(HeapSnapshot* snapshot);
Type type() const { return static_cast<Type>(type_); }
int index() const {
ASSERT(type_ == kElement || type_ == kHidden);
return index_;
const char* name() const {
ASSERT(type_ == kContextVariable
|| type_ == kProperty
|| type_ == kInternal
|| type_ == kShortcut
|| type_ == kWeak);
return name_;
INLINE(HeapEntry* from() const);
HeapEntry* to() const { return to_entry_; }
INLINE(HeapSnapshot* snapshot() const);
unsigned type_ : 3;
int from_index_ : 29;
union {
// During entries population |to_index_| is used for storing the index,
// afterwards it is replaced with a pointer to the entry.
int to_index_;
HeapEntry* to_entry_;
union {
int index_;
const char* name_;
// HeapEntry instances represent an entity from the heap (or a special
// virtual node, e.g. root).
class HeapEntry BASE_EMBEDDED {
enum Type {
kHidden = v8::HeapGraphNode::kHidden,
kArray = v8::HeapGraphNode::kArray,
kString = v8::HeapGraphNode::kString,
kObject = v8::HeapGraphNode::kObject,
kCode = v8::HeapGraphNode::kCode,
kClosure = v8::HeapGraphNode::kClosure,
kRegExp = v8::HeapGraphNode::kRegExp,
kHeapNumber = v8::HeapGraphNode::kHeapNumber,
kNative = v8::HeapGraphNode::kNative,
kSynthetic = v8::HeapGraphNode::kSynthetic,
kConsString = v8::HeapGraphNode::kConsString,
kSlicedString = v8::HeapGraphNode::kSlicedString,
kSymbol = v8::HeapGraphNode::kSymbol
static const int kNoEntry;
HeapEntry() { }
HeapEntry(HeapSnapshot* snapshot,
Type type,
const char* name,
SnapshotObjectId id,
size_t self_size,
unsigned trace_node_id);
HeapSnapshot* snapshot() { return snapshot_; }
Type type() { return static_cast<Type>(type_); }
const char* name() { return name_; }
void set_name(const char* name) { name_ = name; }
inline SnapshotObjectId id() { return id_; }
size_t self_size() { return self_size_; }
unsigned trace_node_id() const { return trace_node_id_; }
INLINE(int index() const);
int children_count() const { return children_count_; }
INLINE(int set_children_index(int index));
void add_child(HeapGraphEdge* edge) {
children_arr()[children_count_++] = edge;
Vector<HeapGraphEdge*> children() {
return Vector<HeapGraphEdge*>(children_arr(), children_count_); }
void SetIndexedReference(
HeapGraphEdge::Type type, int index, HeapEntry* entry);
void SetNamedReference(
HeapGraphEdge::Type type, const char* name, HeapEntry* entry);
void Print(
const char* prefix, const char* edge_name, int max_depth, int indent);
INLINE(HeapGraphEdge** children_arr());
const char* TypeAsString();
unsigned type_: 4;
int children_count_: 28;
int children_index_;
size_t self_size_;
HeapSnapshot* snapshot_;
const char* name_;
SnapshotObjectId id_;
// id of allocation stack trace top node
unsigned trace_node_id_;
// HeapSnapshot represents a single heap snapshot. It is stored in
// HeapProfiler, which is also a factory for
// HeapSnapshots. All HeapSnapshots share strings copied from JS heap
// to be able to return them even if they were collected.
// HeapSnapshotGenerator fills in a HeapSnapshot.
class HeapSnapshot {
HeapSnapshot(HeapProfiler* profiler,
const char* title,
unsigned uid);
void Delete();
HeapProfiler* profiler() { return profiler_; }
const char* title() { return title_; }
unsigned uid() { return uid_; }
size_t RawSnapshotSize() const;
HeapEntry* root() { return &entries_[root_index_]; }
HeapEntry* gc_roots() { return &entries_[gc_roots_index_]; }
HeapEntry* natives_root() { return &entries_[natives_root_index_]; }
HeapEntry* gc_subroot(int index) {
return &entries_[gc_subroot_indexes_[index]];
List<HeapEntry>& entries() { return entries_; }
List<HeapGraphEdge>& edges() { return edges_; }
List<HeapGraphEdge*>& children() { return children_; }
void RememberLastJSObjectId();
SnapshotObjectId max_snapshot_js_object_id() const {
return max_snapshot_js_object_id_;
HeapEntry* AddEntry(HeapEntry::Type type,
const char* name,
SnapshotObjectId id,
size_t size,
unsigned trace_node_id);
HeapEntry* AddRootEntry();
HeapEntry* AddGcRootsEntry();
HeapEntry* AddGcSubrootEntry(int tag);
HeapEntry* AddNativesRootEntry();
HeapEntry* GetEntryById(SnapshotObjectId id);
List<HeapEntry*>* GetSortedEntriesList();
void FillChildren();
void Print(int max_depth);
void PrintEntriesSize();
HeapProfiler* profiler_;
const char* title_;
unsigned uid_;
int root_index_;
int gc_roots_index_;
int natives_root_index_;
int gc_subroot_indexes_[VisitorSynchronization::kNumberOfSyncTags];
List<HeapEntry> entries_;
List<HeapGraphEdge> edges_;
List<HeapGraphEdge*> children_;
List<HeapEntry*> sorted_entries_;
SnapshotObjectId max_snapshot_js_object_id_;
friend class HeapSnapshotTester;
class HeapObjectsMap {
explicit HeapObjectsMap(Heap* heap);
Heap* heap() const { return heap_; }
SnapshotObjectId FindEntry(Address addr);
SnapshotObjectId FindOrAddEntry(Address addr,
unsigned int size,
bool accessed = true);
bool MoveObject(Address from, Address to, int size);
void UpdateObjectSize(Address addr, int size);
SnapshotObjectId last_assigned_id() const {
return next_id_ - kObjectIdStep;
void StopHeapObjectsTracking();
SnapshotObjectId PushHeapObjectsStats(OutputStream* stream);
size_t GetUsedMemorySize() const;
SnapshotObjectId GenerateId(v8::RetainedObjectInfo* info);
static inline SnapshotObjectId GetNthGcSubrootId(int delta);
static const int kObjectIdStep = 2;
static const SnapshotObjectId kInternalRootObjectId;
static const SnapshotObjectId kGcRootsObjectId;
static const SnapshotObjectId kNativesRootObjectId;
static const SnapshotObjectId kGcRootsFirstSubrootId;
static const SnapshotObjectId kFirstAvailableObjectId;
int FindUntrackedObjects();
void UpdateHeapObjectsMap();
void RemoveDeadEntries();
struct EntryInfo {
EntryInfo(SnapshotObjectId id, Address addr, unsigned int size)
: id(id), addr(addr), size(size), accessed(true) { }
EntryInfo(SnapshotObjectId id, Address addr, unsigned int size, bool accessed)
: id(id), addr(addr), size(size), accessed(accessed) { }
SnapshotObjectId id;
Address addr;
unsigned int size;
bool accessed;
struct TimeInterval {
explicit TimeInterval(SnapshotObjectId id) : id(id), size(0), count(0) { }
SnapshotObjectId id;
uint32_t size;
uint32_t count;
SnapshotObjectId next_id_;
HashMap entries_map_;
List<EntryInfo> entries_;
List<TimeInterval> time_intervals_;
Heap* heap_;
// A typedef for referencing anything that can be snapshotted living
// in any kind of heap memory.
typedef void* HeapThing;
// An interface that creates HeapEntries by HeapThings.
class HeapEntriesAllocator {
virtual ~HeapEntriesAllocator() { }
virtual HeapEntry* AllocateEntry(HeapThing ptr) = 0;
// The HeapEntriesMap instance is used to track a mapping between
// real heap objects and their representations in heap snapshots.
class HeapEntriesMap {
int Map(HeapThing thing);
void Pair(HeapThing thing, int entry);
static uint32_t Hash(HeapThing thing) {
return ComputeIntegerHash(
HashMap entries_;
friend class HeapObjectsSet;
class HeapObjectsSet {
void Clear();
bool Contains(Object* object);
void Insert(Object* obj);
const char* GetTag(Object* obj);
void SetTag(Object* obj, const char* tag);
bool is_empty() const { return entries_.occupancy() == 0; }
HashMap entries_;
class SnapshottingProgressReportingInterface {
virtual ~SnapshottingProgressReportingInterface() { }
virtual void ProgressStep() = 0;
virtual bool ProgressReport(bool force) = 0;
// An implementation of V8 heap graph extractor.
class V8HeapExplorer : public HeapEntriesAllocator {
V8HeapExplorer(HeapSnapshot* snapshot,
SnapshottingProgressReportingInterface* progress,
v8::HeapProfiler::ObjectNameResolver* resolver);
virtual ~V8HeapExplorer();
virtual HeapEntry* AllocateEntry(HeapThing ptr);
void AddRootEntries(SnapshotFiller* filler);
int EstimateObjectsCount(HeapIterator* iterator);
bool IterateAndExtractReferences(SnapshotFiller* filler);
void TagGlobalObjects();
void TagCodeObject(Code* code);
void TagBuiltinCodeObject(Code* code, const char* name);
HeapEntry* AddEntry(Address address,
HeapEntry::Type type,
const char* name,
size_t size);
static String* GetConstructorName(JSObject* object);
static HeapObject* const kInternalRootObject;
typedef bool (V8HeapExplorer::*ExtractReferencesMethod)(int entry,
HeapObject* object);
HeapEntry* AddEntry(HeapObject* object);
HeapEntry* AddEntry(HeapObject* object,
HeapEntry::Type type,
const char* name);
const char* GetSystemEntryName(HeapObject* object);
template<V8HeapExplorer::ExtractReferencesMethod extractor>
bool IterateAndExtractSinglePass();
bool ExtractReferencesPass1(int entry, HeapObject* obj);
bool ExtractReferencesPass2(int entry, HeapObject* obj);
void ExtractJSGlobalProxyReferences(int entry, JSGlobalProxy* proxy);
void ExtractJSObjectReferences(int entry, JSObject* js_obj);
void ExtractStringReferences(int entry, String* obj);
void ExtractSymbolReferences(int entry, Symbol* symbol);
void ExtractJSWeakCollectionReferences(int entry,
JSWeakCollection* collection);
void ExtractContextReferences(int entry, Context* context);
void ExtractMapReferences(int entry, Map* map);
void ExtractSharedFunctionInfoReferences(int entry,
SharedFunctionInfo* shared);
void ExtractScriptReferences(int entry, Script* script);
void ExtractAccessorPairReferences(int entry, AccessorPair* accessors);
void ExtractCodeCacheReferences(int entry, CodeCache* code_cache);
void ExtractCodeReferences(int entry, Code* code);
void ExtractBoxReferences(int entry, Box* box);
void ExtractCellReferences(int entry, Cell* cell);
void ExtractPropertyCellReferences(int entry, PropertyCell* cell);
void ExtractAllocationSiteReferences(int entry, AllocationSite* site);
void ExtractJSArrayBufferReferences(int entry, JSArrayBuffer* buffer);
void ExtractFixedArrayReferences(int entry, FixedArray* array);
void ExtractClosureReferences(JSObject* js_obj, int entry);
void ExtractPropertyReferences(JSObject* js_obj, int entry);
bool ExtractAccessorPairProperty(JSObject* js_obj, int entry,
Object* key, Object* callback_obj);
void ExtractElementReferences(JSObject* js_obj, int entry);
void ExtractInternalReferences(JSObject* js_obj, int entry);
bool IsEssentialObject(Object* object);
void SetContextReference(HeapObject* parent_obj,
int parent,
String* reference_name,
Object* child,
int field_offset);
void SetNativeBindReference(HeapObject* parent_obj,
int parent,
const char* reference_name,
Object* child);
void SetElementReference(HeapObject* parent_obj,
int parent,
int index,
Object* child);
void SetInternalReference(HeapObject* parent_obj,
int parent,
const char* reference_name,
Object* child,
int field_offset = -1);
void SetInternalReference(HeapObject* parent_obj,
int parent,
int index,
Object* child,
int field_offset = -1);
void SetHiddenReference(HeapObject* parent_obj,
int parent,
int index,
Object* child);
void SetWeakReference(HeapObject* parent_obj,
int parent,
const char* reference_name,
Object* child_obj,
int field_offset);
void SetWeakReference(HeapObject* parent_obj,
int parent,
int index,
Object* child_obj,
int field_offset);
void SetPropertyReference(HeapObject* parent_obj,
int parent,
Name* reference_name,
Object* child,
const char* name_format_string = NULL,
int field_offset = -1);
void SetUserGlobalReference(Object* user_global);
void SetRootGcRootsReference();
void SetGcRootsReference(VisitorSynchronization::SyncTag tag);
void SetGcSubrootReference(
VisitorSynchronization::SyncTag tag, bool is_weak, Object* child);
const char* GetStrongGcSubrootName(Object* object);
void TagObject(Object* obj, const char* tag);
void MarkAsWeakContainer(Object* object);
HeapEntry* GetEntry(Object* obj);
static inline HeapObject* GetNthGcSubrootObject(int delta);
static inline int GetGcSubrootOrder(HeapObject* subroot);
Heap* heap_;
HeapSnapshot* snapshot_;
StringsStorage* names_;
HeapObjectsMap* heap_object_map_;
SnapshottingProgressReportingInterface* progress_;
SnapshotFiller* filler_;
HeapObjectsSet objects_tags_;
HeapObjectsSet strong_gc_subroot_names_;
HeapObjectsSet user_roots_;
HeapObjectsSet weak_containers_;
v8::HeapProfiler::ObjectNameResolver* global_object_name_resolver_;
static HeapObject* const kGcRootsObject;
static HeapObject* const kFirstGcSubrootObject;
static HeapObject* const kLastGcSubrootObject;
friend class IndexedReferencesExtractor;
friend class GcSubrootsEnumerator;
friend class RootsReferencesExtractor;
class NativeGroupRetainedObjectInfo;
// An implementation of retained native objects extractor.
class NativeObjectsExplorer {
NativeObjectsExplorer(HeapSnapshot* snapshot,
SnapshottingProgressReportingInterface* progress);
virtual ~NativeObjectsExplorer();
void AddRootEntries(SnapshotFiller* filler);
int EstimateObjectsCount();
bool IterateAndExtractReferences(SnapshotFiller* filler);
void FillRetainedObjects();
void FillImplicitReferences();
List<HeapObject*>* GetListMaybeDisposeInfo(v8::RetainedObjectInfo* info);
void SetNativeRootReference(v8::RetainedObjectInfo* info);
void SetRootNativeRootsReference();
void SetWrapperNativeReferences(HeapObject* wrapper,
v8::RetainedObjectInfo* info);
void VisitSubtreeWrapper(Object** p, uint16_t class_id);
static uint32_t InfoHash(v8::RetainedObjectInfo* info) {
return ComputeIntegerHash(static_cast<uint32_t>(info->GetHash()),
static bool RetainedInfosMatch(void* key1, void* key2) {
return key1 == key2 ||
INLINE(static bool StringsMatch(void* key1, void* key2)) {
return strcmp(reinterpret_cast<char*>(key1),
reinterpret_cast<char*>(key2)) == 0;
NativeGroupRetainedObjectInfo* FindOrAddGroupInfo(const char* label);
Isolate* isolate_;
HeapSnapshot* snapshot_;
StringsStorage* names_;
SnapshottingProgressReportingInterface* progress_;
bool embedder_queried_;
HeapObjectsSet in_groups_;
// RetainedObjectInfo* -> List<HeapObject*>*
HashMap objects_by_info_;
HashMap native_groups_;
HeapEntriesAllocator* synthetic_entries_allocator_;
HeapEntriesAllocator* native_entries_allocator_;
// Used during references extraction.
SnapshotFiller* filler_;
static HeapThing const kNativesRootObject;
friend class GlobalHandlesExtractor;
class HeapSnapshotGenerator : public SnapshottingProgressReportingInterface {
HeapSnapshotGenerator(HeapSnapshot* snapshot,
v8::ActivityControl* control,
v8::HeapProfiler::ObjectNameResolver* resolver,
Heap* heap);
bool GenerateSnapshot();
bool FillReferences();
void ProgressStep();
bool ProgressReport(bool force = false);
void SetProgressTotal(int iterations_count);
HeapSnapshot* snapshot_;
v8::ActivityControl* control_;
V8HeapExplorer v8_heap_explorer_;
NativeObjectsExplorer dom_explorer_;
// Mapping from HeapThing pointers to HeapEntry* pointers.
HeapEntriesMap entries_;
// Used during snapshot generation.
int progress_counter_;
int progress_total_;
Heap* heap_;
class OutputStreamWriter;
class HeapSnapshotJSONSerializer {
explicit HeapSnapshotJSONSerializer(HeapSnapshot* snapshot)
: snapshot_(snapshot),
writer_(NULL) {
void Serialize(v8::OutputStream* stream);
INLINE(static bool StringsMatch(void* key1, void* key2)) {
return strcmp(reinterpret_cast<char*>(key1),
reinterpret_cast<char*>(key2)) == 0;
INLINE(static uint32_t StringHash(const void* string)) {
const char* s = reinterpret_cast<const char*>(string);
int len = static_cast<int>(strlen(s));
return StringHasher::HashSequentialString(
s, len, v8::internal::kZeroHashSeed);
int GetStringId(const char* s);
int entry_index(HeapEntry* e) { return e->index() * kNodeFieldsCount; }
void SerializeEdge(HeapGraphEdge* edge, bool first_edge);
void SerializeEdges();
void SerializeImpl();
void SerializeNode(HeapEntry* entry);
void SerializeNodes();
void SerializeSnapshot();
void SerializeTraceTree();
void SerializeTraceNode(AllocationTraceNode* node);
void SerializeTraceNodeInfos();
void SerializeString(const unsigned char* s);
void SerializeStrings();
static const int kEdgeFieldsCount;
static const int kNodeFieldsCount;
HeapSnapshot* snapshot_;
HashMap strings_;
int next_node_id_;
int next_string_id_;
OutputStreamWriter* writer_;
friend class HeapSnapshotJSONSerializerEnumerator;
friend class HeapSnapshotJSONSerializerIterator;
} } // namespace v8::internal