| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "heap-snapshot-generator-inl.h" |
| |
| #include "heap-profiler.h" |
| #include "debug.h" |
| #include "types.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| HeapGraphEdge::HeapGraphEdge(Type type, const char* name, int from, int to) |
| : type_(type), |
| from_index_(from), |
| to_index_(to), |
| name_(name) { |
| ASSERT(type == kContextVariable |
| || type == kProperty |
| || type == kInternal |
| || type == kShortcut); |
| } |
| |
| |
| HeapGraphEdge::HeapGraphEdge(Type type, int index, int from, int to) |
| : type_(type), |
| from_index_(from), |
| to_index_(to), |
| index_(index) { |
| ASSERT(type == kElement || type == kHidden || type == kWeak); |
| } |
| |
| |
| void HeapGraphEdge::ReplaceToIndexWithEntry(HeapSnapshot* snapshot) { |
| to_entry_ = &snapshot->entries()[to_index_]; |
| } |
| |
| |
| const int HeapEntry::kNoEntry = -1; |
| |
| HeapEntry::HeapEntry(HeapSnapshot* snapshot, |
| Type type, |
| const char* name, |
| SnapshotObjectId id, |
| int self_size) |
| : type_(type), |
| children_count_(0), |
| children_index_(-1), |
| self_size_(self_size), |
| id_(id), |
| snapshot_(snapshot), |
| name_(name) { } |
| |
| |
| void HeapEntry::SetNamedReference(HeapGraphEdge::Type type, |
| const char* name, |
| HeapEntry* entry) { |
| HeapGraphEdge edge(type, name, this->index(), entry->index()); |
| snapshot_->edges().Add(edge); |
| ++children_count_; |
| } |
| |
| |
| void HeapEntry::SetIndexedReference(HeapGraphEdge::Type type, |
| int index, |
| HeapEntry* entry) { |
| HeapGraphEdge edge(type, index, this->index(), entry->index()); |
| snapshot_->edges().Add(edge); |
| ++children_count_; |
| } |
| |
| |
| Handle<HeapObject> HeapEntry::GetHeapObject() { |
| return snapshot_->collection()->FindHeapObjectById(id()); |
| } |
| |
| |
| void HeapEntry::Print( |
| const char* prefix, const char* edge_name, int max_depth, int indent) { |
| STATIC_CHECK(sizeof(unsigned) == sizeof(id())); |
| OS::Print("%6d @%6u %*c %s%s: ", |
| self_size(), id(), indent, ' ', prefix, edge_name); |
| if (type() != kString) { |
| OS::Print("%s %.40s\n", TypeAsString(), name_); |
| } else { |
| OS::Print("\""); |
| const char* c = name_; |
| while (*c && (c - name_) <= 40) { |
| if (*c != '\n') |
| OS::Print("%c", *c); |
| else |
| OS::Print("\\n"); |
| ++c; |
| } |
| OS::Print("\"\n"); |
| } |
| if (--max_depth == 0) return; |
| Vector<HeapGraphEdge*> ch = children(); |
| for (int i = 0; i < ch.length(); ++i) { |
| HeapGraphEdge& edge = *ch[i]; |
| const char* edge_prefix = ""; |
| EmbeddedVector<char, 64> index; |
| const char* edge_name = index.start(); |
| switch (edge.type()) { |
| case HeapGraphEdge::kContextVariable: |
| edge_prefix = "#"; |
| edge_name = edge.name(); |
| break; |
| case HeapGraphEdge::kElement: |
| OS::SNPrintF(index, "%d", edge.index()); |
| break; |
| case HeapGraphEdge::kInternal: |
| edge_prefix = "$"; |
| edge_name = edge.name(); |
| break; |
| case HeapGraphEdge::kProperty: |
| edge_name = edge.name(); |
| break; |
| case HeapGraphEdge::kHidden: |
| edge_prefix = "$"; |
| OS::SNPrintF(index, "%d", edge.index()); |
| break; |
| case HeapGraphEdge::kShortcut: |
| edge_prefix = "^"; |
| edge_name = edge.name(); |
| break; |
| case HeapGraphEdge::kWeak: |
| edge_prefix = "w"; |
| OS::SNPrintF(index, "%d", edge.index()); |
| break; |
| default: |
| OS::SNPrintF(index, "!!! unknown edge type: %d ", edge.type()); |
| } |
| edge.to()->Print(edge_prefix, edge_name, max_depth, indent + 2); |
| } |
| } |
| |
| |
| const char* HeapEntry::TypeAsString() { |
| switch (type()) { |
| case kHidden: return "/hidden/"; |
| case kObject: return "/object/"; |
| case kClosure: return "/closure/"; |
| case kString: return "/string/"; |
| case kCode: return "/code/"; |
| case kArray: return "/array/"; |
| case kRegExp: return "/regexp/"; |
| case kHeapNumber: return "/number/"; |
| case kNative: return "/native/"; |
| case kSynthetic: return "/synthetic/"; |
| case kConsString: return "/concatenated string/"; |
| case kSlicedString: return "/sliced string/"; |
| default: return "???"; |
| } |
| } |
| |
| |
| // It is very important to keep objects that form a heap snapshot |
| // as small as possible. |
| namespace { // Avoid littering the global namespace. |
| |
| template <size_t ptr_size> struct SnapshotSizeConstants; |
| |
| template <> struct SnapshotSizeConstants<4> { |
| static const int kExpectedHeapGraphEdgeSize = 12; |
| static const int kExpectedHeapEntrySize = 24; |
| }; |
| |
| template <> struct SnapshotSizeConstants<8> { |
| static const int kExpectedHeapGraphEdgeSize = 24; |
| static const int kExpectedHeapEntrySize = 32; |
| }; |
| |
| } // namespace |
| |
| HeapSnapshot::HeapSnapshot(HeapSnapshotsCollection* collection, |
| const char* title, |
| unsigned uid) |
| : collection_(collection), |
| title_(title), |
| uid_(uid), |
| root_index_(HeapEntry::kNoEntry), |
| gc_roots_index_(HeapEntry::kNoEntry), |
| natives_root_index_(HeapEntry::kNoEntry), |
| max_snapshot_js_object_id_(0) { |
| STATIC_CHECK( |
| sizeof(HeapGraphEdge) == |
| SnapshotSizeConstants<kPointerSize>::kExpectedHeapGraphEdgeSize); |
| STATIC_CHECK( |
| sizeof(HeapEntry) == |
| SnapshotSizeConstants<kPointerSize>::kExpectedHeapEntrySize); |
| for (int i = 0; i < VisitorSynchronization::kNumberOfSyncTags; ++i) { |
| gc_subroot_indexes_[i] = HeapEntry::kNoEntry; |
| } |
| } |
| |
| |
| void HeapSnapshot::Delete() { |
| collection_->RemoveSnapshot(this); |
| delete this; |
| } |
| |
| |
| void HeapSnapshot::RememberLastJSObjectId() { |
| max_snapshot_js_object_id_ = collection_->last_assigned_id(); |
| } |
| |
| |
| HeapEntry* HeapSnapshot::AddRootEntry() { |
| ASSERT(root_index_ == HeapEntry::kNoEntry); |
| ASSERT(entries_.is_empty()); // Root entry must be the first one. |
| HeapEntry* entry = AddEntry(HeapEntry::kSynthetic, |
| "", |
| HeapObjectsMap::kInternalRootObjectId, |
| 0); |
| root_index_ = entry->index(); |
| ASSERT(root_index_ == 0); |
| return entry; |
| } |
| |
| |
| HeapEntry* HeapSnapshot::AddGcRootsEntry() { |
| ASSERT(gc_roots_index_ == HeapEntry::kNoEntry); |
| HeapEntry* entry = AddEntry(HeapEntry::kSynthetic, |
| "(GC roots)", |
| HeapObjectsMap::kGcRootsObjectId, |
| 0); |
| gc_roots_index_ = entry->index(); |
| return entry; |
| } |
| |
| |
| HeapEntry* HeapSnapshot::AddGcSubrootEntry(int tag) { |
| ASSERT(gc_subroot_indexes_[tag] == HeapEntry::kNoEntry); |
| ASSERT(0 <= tag && tag < VisitorSynchronization::kNumberOfSyncTags); |
| HeapEntry* entry = AddEntry( |
| HeapEntry::kSynthetic, |
| VisitorSynchronization::kTagNames[tag], |
| HeapObjectsMap::GetNthGcSubrootId(tag), |
| 0); |
| gc_subroot_indexes_[tag] = entry->index(); |
| return entry; |
| } |
| |
| |
| HeapEntry* HeapSnapshot::AddEntry(HeapEntry::Type type, |
| const char* name, |
| SnapshotObjectId id, |
| int size) { |
| HeapEntry entry(this, type, name, id, size); |
| entries_.Add(entry); |
| return &entries_.last(); |
| } |
| |
| |
| void HeapSnapshot::FillChildren() { |
| ASSERT(children().is_empty()); |
| children().Allocate(edges().length()); |
| int children_index = 0; |
| for (int i = 0; i < entries().length(); ++i) { |
| HeapEntry* entry = &entries()[i]; |
| children_index = entry->set_children_index(children_index); |
| } |
| ASSERT(edges().length() == children_index); |
| for (int i = 0; i < edges().length(); ++i) { |
| HeapGraphEdge* edge = &edges()[i]; |
| edge->ReplaceToIndexWithEntry(this); |
| edge->from()->add_child(edge); |
| } |
| } |
| |
| |
| class FindEntryById { |
| public: |
| explicit FindEntryById(SnapshotObjectId id) : id_(id) { } |
| int operator()(HeapEntry* const* entry) { |
| if ((*entry)->id() == id_) return 0; |
| return (*entry)->id() < id_ ? -1 : 1; |
| } |
| private: |
| SnapshotObjectId id_; |
| }; |
| |
| |
| HeapEntry* HeapSnapshot::GetEntryById(SnapshotObjectId id) { |
| List<HeapEntry*>* entries_by_id = GetSortedEntriesList(); |
| // Perform a binary search by id. |
| int index = SortedListBSearch(*entries_by_id, FindEntryById(id)); |
| if (index == -1) |
| return NULL; |
| return entries_by_id->at(index); |
| } |
| |
| |
| template<class T> |
| static int SortByIds(const T* entry1_ptr, |
| const T* entry2_ptr) { |
| if ((*entry1_ptr)->id() == (*entry2_ptr)->id()) return 0; |
| return (*entry1_ptr)->id() < (*entry2_ptr)->id() ? -1 : 1; |
| } |
| |
| |
| List<HeapEntry*>* HeapSnapshot::GetSortedEntriesList() { |
| if (sorted_entries_.is_empty()) { |
| sorted_entries_.Allocate(entries_.length()); |
| for (int i = 0; i < entries_.length(); ++i) { |
| sorted_entries_[i] = &entries_[i]; |
| } |
| sorted_entries_.Sort(SortByIds); |
| } |
| return &sorted_entries_; |
| } |
| |
| |
| void HeapSnapshot::Print(int max_depth) { |
| root()->Print("", "", max_depth, 0); |
| } |
| |
| |
| template<typename T, class P> |
| static size_t GetMemoryUsedByList(const List<T, P>& list) { |
| return list.length() * sizeof(T) + sizeof(list); |
| } |
| |
| |
| size_t HeapSnapshot::RawSnapshotSize() const { |
| return |
| sizeof(*this) + |
| GetMemoryUsedByList(entries_) + |
| GetMemoryUsedByList(edges_) + |
| GetMemoryUsedByList(children_) + |
| GetMemoryUsedByList(sorted_entries_); |
| } |
| |
| |
| // We split IDs on evens for embedder objects (see |
| // HeapObjectsMap::GenerateId) and odds for native objects. |
| const SnapshotObjectId HeapObjectsMap::kInternalRootObjectId = 1; |
| const SnapshotObjectId HeapObjectsMap::kGcRootsObjectId = |
| HeapObjectsMap::kInternalRootObjectId + HeapObjectsMap::kObjectIdStep; |
| const SnapshotObjectId HeapObjectsMap::kGcRootsFirstSubrootId = |
| HeapObjectsMap::kGcRootsObjectId + HeapObjectsMap::kObjectIdStep; |
| const SnapshotObjectId HeapObjectsMap::kFirstAvailableObjectId = |
| HeapObjectsMap::kGcRootsFirstSubrootId + |
| VisitorSynchronization::kNumberOfSyncTags * HeapObjectsMap::kObjectIdStep; |
| |
| |
| static bool AddressesMatch(void* key1, void* key2) { |
| return key1 == key2; |
| } |
| |
| |
| HeapObjectsMap::HeapObjectsMap(Heap* heap) |
| : next_id_(kFirstAvailableObjectId), |
| entries_map_(AddressesMatch), |
| heap_(heap) { |
| // This dummy element solves a problem with entries_map_. |
| // When we do lookup in HashMap we see no difference between two cases: |
| // it has an entry with NULL as the value or it has created |
| // a new entry on the fly with NULL as the default value. |
| // With such dummy element we have a guaranty that all entries_map_ entries |
| // will have the value field grater than 0. |
| // This fact is using in MoveObject method. |
| entries_.Add(EntryInfo(0, NULL, 0)); |
| } |
| |
| |
| void HeapObjectsMap::SnapshotGenerationFinished() { |
| RemoveDeadEntries(); |
| } |
| |
| |
| void HeapObjectsMap::MoveObject(Address from, Address to) { |
| ASSERT(to != NULL); |
| ASSERT(from != NULL); |
| if (from == to) return; |
| void* from_value = entries_map_.Remove(from, ComputePointerHash(from)); |
| if (from_value == NULL) { |
| // It may occur that some untracked object moves to an address X and there |
| // is a tracked object at that address. In this case we should remove the |
| // entry as we know that the object has died. |
| void* to_value = entries_map_.Remove(to, ComputePointerHash(to)); |
| if (to_value != NULL) { |
| int to_entry_info_index = |
| static_cast<int>(reinterpret_cast<intptr_t>(to_value)); |
| entries_.at(to_entry_info_index).addr = NULL; |
| } |
| } else { |
| HashMap::Entry* to_entry = entries_map_.Lookup(to, ComputePointerHash(to), |
| true); |
| if (to_entry->value != NULL) { |
| // We found the existing entry with to address for an old object. |
| // Without this operation we will have two EntryInfo's with the same |
| // value in addr field. It is bad because later at RemoveDeadEntries |
| // one of this entry will be removed with the corresponding entries_map_ |
| // entry. |
| int to_entry_info_index = |
| static_cast<int>(reinterpret_cast<intptr_t>(to_entry->value)); |
| entries_.at(to_entry_info_index).addr = NULL; |
| } |
| int from_entry_info_index = |
| static_cast<int>(reinterpret_cast<intptr_t>(from_value)); |
| entries_.at(from_entry_info_index).addr = to; |
| to_entry->value = from_value; |
| } |
| } |
| |
| |
| SnapshotObjectId HeapObjectsMap::FindEntry(Address addr) { |
| HashMap::Entry* entry = entries_map_.Lookup(addr, ComputePointerHash(addr), |
| false); |
| if (entry == NULL) return 0; |
| int entry_index = static_cast<int>(reinterpret_cast<intptr_t>(entry->value)); |
| EntryInfo& entry_info = entries_.at(entry_index); |
| ASSERT(static_cast<uint32_t>(entries_.length()) > entries_map_.occupancy()); |
| return entry_info.id; |
| } |
| |
| |
| SnapshotObjectId HeapObjectsMap::FindOrAddEntry(Address addr, |
| unsigned int size) { |
| ASSERT(static_cast<uint32_t>(entries_.length()) > entries_map_.occupancy()); |
| HashMap::Entry* entry = entries_map_.Lookup(addr, ComputePointerHash(addr), |
| true); |
| if (entry->value != NULL) { |
| int entry_index = |
| static_cast<int>(reinterpret_cast<intptr_t>(entry->value)); |
| EntryInfo& entry_info = entries_.at(entry_index); |
| entry_info.accessed = true; |
| entry_info.size = size; |
| return entry_info.id; |
| } |
| entry->value = reinterpret_cast<void*>(entries_.length()); |
| SnapshotObjectId id = next_id_; |
| next_id_ += kObjectIdStep; |
| entries_.Add(EntryInfo(id, addr, size)); |
| ASSERT(static_cast<uint32_t>(entries_.length()) > entries_map_.occupancy()); |
| return id; |
| } |
| |
| |
| void HeapObjectsMap::StopHeapObjectsTracking() { |
| time_intervals_.Clear(); |
| } |
| |
| |
| void HeapObjectsMap::UpdateHeapObjectsMap() { |
| heap_->CollectAllGarbage(Heap::kMakeHeapIterableMask, |
| "HeapSnapshotsCollection::UpdateHeapObjectsMap"); |
| HeapIterator iterator(heap_); |
| for (HeapObject* obj = iterator.next(); |
| obj != NULL; |
| obj = iterator.next()) { |
| FindOrAddEntry(obj->address(), obj->Size()); |
| } |
| RemoveDeadEntries(); |
| } |
| |
| |
| SnapshotObjectId HeapObjectsMap::PushHeapObjectsStats(OutputStream* stream) { |
| UpdateHeapObjectsMap(); |
| time_intervals_.Add(TimeInterval(next_id_)); |
| int prefered_chunk_size = stream->GetChunkSize(); |
| List<v8::HeapStatsUpdate> stats_buffer; |
| ASSERT(!entries_.is_empty()); |
| EntryInfo* entry_info = &entries_.first(); |
| EntryInfo* end_entry_info = &entries_.last() + 1; |
| for (int time_interval_index = 0; |
| time_interval_index < time_intervals_.length(); |
| ++time_interval_index) { |
| TimeInterval& time_interval = time_intervals_[time_interval_index]; |
| SnapshotObjectId time_interval_id = time_interval.id; |
| uint32_t entries_size = 0; |
| EntryInfo* start_entry_info = entry_info; |
| while (entry_info < end_entry_info && entry_info->id < time_interval_id) { |
| entries_size += entry_info->size; |
| ++entry_info; |
| } |
| uint32_t entries_count = |
| static_cast<uint32_t>(entry_info - start_entry_info); |
| if (time_interval.count != entries_count || |
| time_interval.size != entries_size) { |
| stats_buffer.Add(v8::HeapStatsUpdate( |
| time_interval_index, |
| time_interval.count = entries_count, |
| time_interval.size = entries_size)); |
| if (stats_buffer.length() >= prefered_chunk_size) { |
| OutputStream::WriteResult result = stream->WriteHeapStatsChunk( |
| &stats_buffer.first(), stats_buffer.length()); |
| if (result == OutputStream::kAbort) return last_assigned_id(); |
| stats_buffer.Clear(); |
| } |
| } |
| } |
| ASSERT(entry_info == end_entry_info); |
| if (!stats_buffer.is_empty()) { |
| OutputStream::WriteResult result = stream->WriteHeapStatsChunk( |
| &stats_buffer.first(), stats_buffer.length()); |
| if (result == OutputStream::kAbort) return last_assigned_id(); |
| } |
| stream->EndOfStream(); |
| return last_assigned_id(); |
| } |
| |
| |
| void HeapObjectsMap::RemoveDeadEntries() { |
| ASSERT(entries_.length() > 0 && |
| entries_.at(0).id == 0 && |
| entries_.at(0).addr == NULL); |
| int first_free_entry = 1; |
| for (int i = 1; i < entries_.length(); ++i) { |
| EntryInfo& entry_info = entries_.at(i); |
| if (entry_info.accessed) { |
| if (first_free_entry != i) { |
| entries_.at(first_free_entry) = entry_info; |
| } |
| entries_.at(first_free_entry).accessed = false; |
| HashMap::Entry* entry = entries_map_.Lookup( |
| entry_info.addr, ComputePointerHash(entry_info.addr), false); |
| ASSERT(entry); |
| entry->value = reinterpret_cast<void*>(first_free_entry); |
| ++first_free_entry; |
| } else { |
| if (entry_info.addr) { |
| entries_map_.Remove(entry_info.addr, |
| ComputePointerHash(entry_info.addr)); |
| } |
| } |
| } |
| entries_.Rewind(first_free_entry); |
| ASSERT(static_cast<uint32_t>(entries_.length()) - 1 == |
| entries_map_.occupancy()); |
| } |
| |
| |
| SnapshotObjectId HeapObjectsMap::GenerateId(Heap* heap, |
| v8::RetainedObjectInfo* info) { |
| SnapshotObjectId id = static_cast<SnapshotObjectId>(info->GetHash()); |
| const char* label = info->GetLabel(); |
| id ^= StringHasher::HashSequentialString(label, |
| static_cast<int>(strlen(label)), |
| heap->HashSeed()); |
| intptr_t element_count = info->GetElementCount(); |
| if (element_count != -1) |
| id ^= ComputeIntegerHash(static_cast<uint32_t>(element_count), |
| v8::internal::kZeroHashSeed); |
| return id << 1; |
| } |
| |
| |
| size_t HeapObjectsMap::GetUsedMemorySize() const { |
| return |
| sizeof(*this) + |
| sizeof(HashMap::Entry) * entries_map_.capacity() + |
| GetMemoryUsedByList(entries_) + |
| GetMemoryUsedByList(time_intervals_); |
| } |
| |
| |
| HeapSnapshotsCollection::HeapSnapshotsCollection(Heap* heap) |
| : is_tracking_objects_(false), |
| names_(heap), |
| ids_(heap) { |
| } |
| |
| |
| static void DeleteHeapSnapshot(HeapSnapshot** snapshot_ptr) { |
| delete *snapshot_ptr; |
| } |
| |
| |
| HeapSnapshotsCollection::~HeapSnapshotsCollection() { |
| snapshots_.Iterate(DeleteHeapSnapshot); |
| } |
| |
| |
| HeapSnapshot* HeapSnapshotsCollection::NewSnapshot(const char* name, |
| unsigned uid) { |
| is_tracking_objects_ = true; // Start watching for heap objects moves. |
| return new HeapSnapshot(this, name, uid); |
| } |
| |
| |
| void HeapSnapshotsCollection::SnapshotGenerationFinished( |
| HeapSnapshot* snapshot) { |
| ids_.SnapshotGenerationFinished(); |
| if (snapshot != NULL) { |
| snapshots_.Add(snapshot); |
| } |
| } |
| |
| |
| void HeapSnapshotsCollection::RemoveSnapshot(HeapSnapshot* snapshot) { |
| snapshots_.RemoveElement(snapshot); |
| } |
| |
| |
| Handle<HeapObject> HeapSnapshotsCollection::FindHeapObjectById( |
| SnapshotObjectId id) { |
| // First perform a full GC in order to avoid dead objects. |
| heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask, |
| "HeapSnapshotsCollection::FindHeapObjectById"); |
| DisallowHeapAllocation no_allocation; |
| HeapObject* object = NULL; |
| HeapIterator iterator(heap(), HeapIterator::kFilterUnreachable); |
| // Make sure that object with the given id is still reachable. |
| for (HeapObject* obj = iterator.next(); |
| obj != NULL; |
| obj = iterator.next()) { |
| if (ids_.FindEntry(obj->address()) == id) { |
| ASSERT(object == NULL); |
| object = obj; |
| // Can't break -- kFilterUnreachable requires full heap traversal. |
| } |
| } |
| return object != NULL ? Handle<HeapObject>(object) : Handle<HeapObject>(); |
| } |
| |
| |
| size_t HeapSnapshotsCollection::GetUsedMemorySize() const { |
| size_t size = sizeof(*this); |
| size += names_.GetUsedMemorySize(); |
| size += ids_.GetUsedMemorySize(); |
| size += GetMemoryUsedByList(snapshots_); |
| for (int i = 0; i < snapshots_.length(); ++i) { |
| size += snapshots_[i]->RawSnapshotSize(); |
| } |
| return size; |
| } |
| |
| |
| HeapEntriesMap::HeapEntriesMap() |
| : entries_(HeapThingsMatch) { |
| } |
| |
| |
| int HeapEntriesMap::Map(HeapThing thing) { |
| HashMap::Entry* cache_entry = entries_.Lookup(thing, Hash(thing), false); |
| if (cache_entry == NULL) return HeapEntry::kNoEntry; |
| return static_cast<int>(reinterpret_cast<intptr_t>(cache_entry->value)); |
| } |
| |
| |
| void HeapEntriesMap::Pair(HeapThing thing, int entry) { |
| HashMap::Entry* cache_entry = entries_.Lookup(thing, Hash(thing), true); |
| ASSERT(cache_entry->value == NULL); |
| cache_entry->value = reinterpret_cast<void*>(static_cast<intptr_t>(entry)); |
| } |
| |
| |
| HeapObjectsSet::HeapObjectsSet() |
| : entries_(HeapEntriesMap::HeapThingsMatch) { |
| } |
| |
| |
| void HeapObjectsSet::Clear() { |
| entries_.Clear(); |
| } |
| |
| |
| bool HeapObjectsSet::Contains(Object* obj) { |
| if (!obj->IsHeapObject()) return false; |
| HeapObject* object = HeapObject::cast(obj); |
| return entries_.Lookup(object, HeapEntriesMap::Hash(object), false) != NULL; |
| } |
| |
| |
| void HeapObjectsSet::Insert(Object* obj) { |
| if (!obj->IsHeapObject()) return; |
| HeapObject* object = HeapObject::cast(obj); |
| entries_.Lookup(object, HeapEntriesMap::Hash(object), true); |
| } |
| |
| |
| const char* HeapObjectsSet::GetTag(Object* obj) { |
| HeapObject* object = HeapObject::cast(obj); |
| HashMap::Entry* cache_entry = |
| entries_.Lookup(object, HeapEntriesMap::Hash(object), false); |
| return cache_entry != NULL |
| ? reinterpret_cast<const char*>(cache_entry->value) |
| : NULL; |
| } |
| |
| |
| void HeapObjectsSet::SetTag(Object* obj, const char* tag) { |
| if (!obj->IsHeapObject()) return; |
| HeapObject* object = HeapObject::cast(obj); |
| HashMap::Entry* cache_entry = |
| entries_.Lookup(object, HeapEntriesMap::Hash(object), true); |
| cache_entry->value = const_cast<char*>(tag); |
| } |
| |
| |
| HeapObject* const V8HeapExplorer::kInternalRootObject = |
| reinterpret_cast<HeapObject*>( |
| static_cast<intptr_t>(HeapObjectsMap::kInternalRootObjectId)); |
| HeapObject* const V8HeapExplorer::kGcRootsObject = |
| reinterpret_cast<HeapObject*>( |
| static_cast<intptr_t>(HeapObjectsMap::kGcRootsObjectId)); |
| HeapObject* const V8HeapExplorer::kFirstGcSubrootObject = |
| reinterpret_cast<HeapObject*>( |
| static_cast<intptr_t>(HeapObjectsMap::kGcRootsFirstSubrootId)); |
| HeapObject* const V8HeapExplorer::kLastGcSubrootObject = |
| reinterpret_cast<HeapObject*>( |
| static_cast<intptr_t>(HeapObjectsMap::kFirstAvailableObjectId)); |
| |
| |
| V8HeapExplorer::V8HeapExplorer( |
| HeapSnapshot* snapshot, |
| SnapshottingProgressReportingInterface* progress, |
| v8::HeapProfiler::ObjectNameResolver* resolver) |
| : heap_(snapshot->collection()->heap()), |
| snapshot_(snapshot), |
| collection_(snapshot_->collection()), |
| progress_(progress), |
| filler_(NULL), |
| global_object_name_resolver_(resolver) { |
| } |
| |
| |
| V8HeapExplorer::~V8HeapExplorer() { |
| } |
| |
| |
| HeapEntry* V8HeapExplorer::AllocateEntry(HeapThing ptr) { |
| return AddEntry(reinterpret_cast<HeapObject*>(ptr)); |
| } |
| |
| |
| HeapEntry* V8HeapExplorer::AddEntry(HeapObject* object) { |
| if (object == kInternalRootObject) { |
| snapshot_->AddRootEntry(); |
| return snapshot_->root(); |
| } else if (object == kGcRootsObject) { |
| HeapEntry* entry = snapshot_->AddGcRootsEntry(); |
| return entry; |
| } else if (object >= kFirstGcSubrootObject && object < kLastGcSubrootObject) { |
| HeapEntry* entry = snapshot_->AddGcSubrootEntry(GetGcSubrootOrder(object)); |
| return entry; |
| } else if (object->IsJSFunction()) { |
| JSFunction* func = JSFunction::cast(object); |
| SharedFunctionInfo* shared = func->shared(); |
| const char* name = shared->bound() ? "native_bind" : |
| collection_->names()->GetName(String::cast(shared->name())); |
| return AddEntry(object, HeapEntry::kClosure, name); |
| } else if (object->IsJSRegExp()) { |
| JSRegExp* re = JSRegExp::cast(object); |
| return AddEntry(object, |
| HeapEntry::kRegExp, |
| collection_->names()->GetName(re->Pattern())); |
| } else if (object->IsJSObject()) { |
| const char* name = collection_->names()->GetName( |
| GetConstructorName(JSObject::cast(object))); |
| if (object->IsJSGlobalObject()) { |
| const char* tag = objects_tags_.GetTag(object); |
| if (tag != NULL) { |
| name = collection_->names()->GetFormatted("%s / %s", name, tag); |
| } |
| } |
| return AddEntry(object, HeapEntry::kObject, name); |
| } else if (object->IsString()) { |
| String* string = String::cast(object); |
| if (string->IsConsString()) |
| return AddEntry(object, |
| HeapEntry::kConsString, |
| "(concatenated string)"); |
| if (string->IsSlicedString()) |
| return AddEntry(object, |
| HeapEntry::kSlicedString, |
| "(sliced string)"); |
| return AddEntry(object, |
| HeapEntry::kString, |
| collection_->names()->GetName(String::cast(object))); |
| } else if (object->IsCode()) { |
| return AddEntry(object, HeapEntry::kCode, ""); |
| } else if (object->IsSharedFunctionInfo()) { |
| String* name = String::cast(SharedFunctionInfo::cast(object)->name()); |
| return AddEntry(object, |
| HeapEntry::kCode, |
| collection_->names()->GetName(name)); |
| } else if (object->IsScript()) { |
| Object* name = Script::cast(object)->name(); |
| return AddEntry(object, |
| HeapEntry::kCode, |
| name->IsString() |
| ? collection_->names()->GetName(String::cast(name)) |
| : ""); |
| } else if (object->IsNativeContext()) { |
| return AddEntry(object, HeapEntry::kHidden, "system / NativeContext"); |
| } else if (object->IsContext()) { |
| return AddEntry(object, HeapEntry::kObject, "system / Context"); |
| } else if (object->IsFixedArray() || |
| object->IsFixedDoubleArray() || |
| object->IsByteArray() || |
| object->IsExternalArray()) { |
| return AddEntry(object, HeapEntry::kArray, ""); |
| } else if (object->IsHeapNumber()) { |
| return AddEntry(object, HeapEntry::kHeapNumber, "number"); |
| } |
| return AddEntry(object, HeapEntry::kHidden, GetSystemEntryName(object)); |
| } |
| |
| |
| HeapEntry* V8HeapExplorer::AddEntry(HeapObject* object, |
| HeapEntry::Type type, |
| const char* name) { |
| int object_size = object->Size(); |
| SnapshotObjectId object_id = |
| collection_->GetObjectId(object->address(), object_size); |
| return snapshot_->AddEntry(type, name, object_id, object_size); |
| } |
| |
| |
| class GcSubrootsEnumerator : public ObjectVisitor { |
| public: |
| GcSubrootsEnumerator( |
| SnapshotFillerInterface* filler, V8HeapExplorer* explorer) |
| : filler_(filler), |
| explorer_(explorer), |
| previous_object_count_(0), |
| object_count_(0) { |
| } |
| void VisitPointers(Object** start, Object** end) { |
| object_count_ += end - start; |
| } |
| void Synchronize(VisitorSynchronization::SyncTag tag) { |
| // Skip empty subroots. |
| if (previous_object_count_ != object_count_) { |
| previous_object_count_ = object_count_; |
| filler_->AddEntry(V8HeapExplorer::GetNthGcSubrootObject(tag), explorer_); |
| } |
| } |
| private: |
| SnapshotFillerInterface* filler_; |
| V8HeapExplorer* explorer_; |
| intptr_t previous_object_count_; |
| intptr_t object_count_; |
| }; |
| |
| |
| void V8HeapExplorer::AddRootEntries(SnapshotFillerInterface* filler) { |
| filler->AddEntry(kInternalRootObject, this); |
| filler->AddEntry(kGcRootsObject, this); |
| GcSubrootsEnumerator enumerator(filler, this); |
| heap_->IterateRoots(&enumerator, VISIT_ALL); |
| } |
| |
| |
| const char* V8HeapExplorer::GetSystemEntryName(HeapObject* object) { |
| switch (object->map()->instance_type()) { |
| case MAP_TYPE: |
| switch (Map::cast(object)->instance_type()) { |
| #define MAKE_STRING_MAP_CASE(instance_type, size, name, Name) \ |
| case instance_type: return "system / Map (" #Name ")"; |
| STRING_TYPE_LIST(MAKE_STRING_MAP_CASE) |
| #undef MAKE_STRING_MAP_CASE |
| default: return "system / Map"; |
| } |
| case CELL_TYPE: return "system / Cell"; |
| case PROPERTY_CELL_TYPE: return "system / PropertyCell"; |
| case FOREIGN_TYPE: return "system / Foreign"; |
| case ODDBALL_TYPE: return "system / Oddball"; |
| #define MAKE_STRUCT_CASE(NAME, Name, name) \ |
| case NAME##_TYPE: return "system / "#Name; |
| STRUCT_LIST(MAKE_STRUCT_CASE) |
| #undef MAKE_STRUCT_CASE |
| default: return "system"; |
| } |
| } |
| |
| |
| int V8HeapExplorer::EstimateObjectsCount(HeapIterator* iterator) { |
| int objects_count = 0; |
| for (HeapObject* obj = iterator->next(); |
| obj != NULL; |
| obj = iterator->next()) { |
| objects_count++; |
| } |
| return objects_count; |
| } |
| |
| |
| class IndexedReferencesExtractor : public ObjectVisitor { |
| public: |
| IndexedReferencesExtractor(V8HeapExplorer* generator, |
| HeapObject* parent_obj, |
| int parent) |
| : generator_(generator), |
| parent_obj_(parent_obj), |
| parent_(parent), |
| next_index_(0) { |
| } |
| void VisitCodeEntry(Address entry_address) { |
| Code* code = Code::cast(Code::GetObjectFromEntryAddress(entry_address)); |
| generator_->SetInternalReference(parent_obj_, parent_, "code", code); |
| generator_->TagObject(code, "(code)"); |
| } |
| void VisitPointers(Object** start, Object** end) { |
| for (Object** p = start; p < end; p++) { |
| if (CheckVisitedAndUnmark(p)) continue; |
| generator_->SetHiddenReference(parent_obj_, parent_, next_index_++, *p); |
| } |
| } |
| static void MarkVisitedField(HeapObject* obj, int offset) { |
| if (offset < 0) return; |
| Address field = obj->address() + offset; |
| ASSERT(!Memory::Object_at(field)->IsFailure()); |
| ASSERT(Memory::Object_at(field)->IsHeapObject()); |
| *field |= kFailureTag; |
| } |
| |
| private: |
| bool CheckVisitedAndUnmark(Object** field) { |
| if ((*field)->IsFailure()) { |
| intptr_t untagged = reinterpret_cast<intptr_t>(*field) & ~kFailureTagMask; |
| *field = reinterpret_cast<Object*>(untagged | kHeapObjectTag); |
| ASSERT((*field)->IsHeapObject()); |
| return true; |
| } |
| return false; |
| } |
| V8HeapExplorer* generator_; |
| HeapObject* parent_obj_; |
| int parent_; |
| int next_index_; |
| }; |
| |
| |
| void V8HeapExplorer::ExtractReferences(HeapObject* obj) { |
| HeapEntry* heap_entry = GetEntry(obj); |
| if (heap_entry == NULL) return; // No interest in this object. |
| int entry = heap_entry->index(); |
| |
| if (obj->IsJSGlobalProxy()) { |
| ExtractJSGlobalProxyReferences(entry, JSGlobalProxy::cast(obj)); |
| } else if (obj->IsJSObject()) { |
| ExtractJSObjectReferences(entry, JSObject::cast(obj)); |
| } else if (obj->IsString()) { |
| ExtractStringReferences(entry, String::cast(obj)); |
| } else if (obj->IsContext()) { |
| ExtractContextReferences(entry, Context::cast(obj)); |
| } else if (obj->IsMap()) { |
| ExtractMapReferences(entry, Map::cast(obj)); |
| } else if (obj->IsSharedFunctionInfo()) { |
| ExtractSharedFunctionInfoReferences(entry, SharedFunctionInfo::cast(obj)); |
| } else if (obj->IsScript()) { |
| ExtractScriptReferences(entry, Script::cast(obj)); |
| } else if (obj->IsAccessorPair()) { |
| ExtractAccessorPairReferences(entry, AccessorPair::cast(obj)); |
| } else if (obj->IsCodeCache()) { |
| ExtractCodeCacheReferences(entry, CodeCache::cast(obj)); |
| } else if (obj->IsCode()) { |
| ExtractCodeReferences(entry, Code::cast(obj)); |
| } else if (obj->IsCell()) { |
| ExtractCellReferences(entry, Cell::cast(obj)); |
| } else if (obj->IsPropertyCell()) { |
| ExtractPropertyCellReferences(entry, PropertyCell::cast(obj)); |
| } else if (obj->IsAllocationSite()) { |
| ExtractAllocationSiteReferences(entry, AllocationSite::cast(obj)); |
| } |
| SetInternalReference(obj, entry, "map", obj->map(), HeapObject::kMapOffset); |
| |
| // Extract unvisited fields as hidden references and restore tags |
| // of visited fields. |
| IndexedReferencesExtractor refs_extractor(this, obj, entry); |
| obj->Iterate(&refs_extractor); |
| } |
| |
| |
| void V8HeapExplorer::ExtractJSGlobalProxyReferences( |
| int entry, JSGlobalProxy* proxy) { |
| SetInternalReference(proxy, entry, |
| "native_context", proxy->native_context(), |
| JSGlobalProxy::kNativeContextOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractJSObjectReferences( |
| int entry, JSObject* js_obj) { |
| HeapObject* obj = js_obj; |
| ExtractClosureReferences(js_obj, entry); |
| ExtractPropertyReferences(js_obj, entry); |
| ExtractElementReferences(js_obj, entry); |
| ExtractInternalReferences(js_obj, entry); |
| SetPropertyReference( |
| obj, entry, heap_->proto_string(), js_obj->GetPrototype()); |
| if (obj->IsJSFunction()) { |
| JSFunction* js_fun = JSFunction::cast(js_obj); |
| Object* proto_or_map = js_fun->prototype_or_initial_map(); |
| if (!proto_or_map->IsTheHole()) { |
| if (!proto_or_map->IsMap()) { |
| SetPropertyReference( |
| obj, entry, |
| heap_->prototype_string(), proto_or_map, |
| NULL, |
| JSFunction::kPrototypeOrInitialMapOffset); |
| } else { |
| SetPropertyReference( |
| obj, entry, |
| heap_->prototype_string(), js_fun->prototype()); |
| SetInternalReference( |
| obj, entry, "initial_map", proto_or_map, |
| JSFunction::kPrototypeOrInitialMapOffset); |
| } |
| } |
| SharedFunctionInfo* shared_info = js_fun->shared(); |
| // JSFunction has either bindings or literals and never both. |
| bool bound = shared_info->bound(); |
| TagObject(js_fun->literals_or_bindings(), |
| bound ? "(function bindings)" : "(function literals)"); |
| SetInternalReference(js_fun, entry, |
| bound ? "bindings" : "literals", |
| js_fun->literals_or_bindings(), |
| JSFunction::kLiteralsOffset); |
| TagObject(shared_info, "(shared function info)"); |
| SetInternalReference(js_fun, entry, |
| "shared", shared_info, |
| JSFunction::kSharedFunctionInfoOffset); |
| TagObject(js_fun->context(), "(context)"); |
| SetInternalReference(js_fun, entry, |
| "context", js_fun->context(), |
| JSFunction::kContextOffset); |
| for (int i = JSFunction::kNonWeakFieldsEndOffset; |
| i < JSFunction::kSize; |
| i += kPointerSize) { |
| SetWeakReference(js_fun, entry, i, *HeapObject::RawField(js_fun, i), i); |
| } |
| } else if (obj->IsGlobalObject()) { |
| GlobalObject* global_obj = GlobalObject::cast(obj); |
| SetInternalReference(global_obj, entry, |
| "builtins", global_obj->builtins(), |
| GlobalObject::kBuiltinsOffset); |
| SetInternalReference(global_obj, entry, |
| "native_context", global_obj->native_context(), |
| GlobalObject::kNativeContextOffset); |
| SetInternalReference(global_obj, entry, |
| "global_receiver", global_obj->global_receiver(), |
| GlobalObject::kGlobalReceiverOffset); |
| } |
| TagObject(js_obj->properties(), "(object properties)"); |
| SetInternalReference(obj, entry, |
| "properties", js_obj->properties(), |
| JSObject::kPropertiesOffset); |
| TagObject(js_obj->elements(), "(object elements)"); |
| SetInternalReference(obj, entry, |
| "elements", js_obj->elements(), |
| JSObject::kElementsOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractStringReferences(int entry, String* string) { |
| if (string->IsConsString()) { |
| ConsString* cs = ConsString::cast(string); |
| SetInternalReference(cs, entry, "first", cs->first(), |
| ConsString::kFirstOffset); |
| SetInternalReference(cs, entry, "second", cs->second(), |
| ConsString::kSecondOffset); |
| } else if (string->IsSlicedString()) { |
| SlicedString* ss = SlicedString::cast(string); |
| SetInternalReference(ss, entry, "parent", ss->parent(), |
| SlicedString::kParentOffset); |
| } |
| } |
| |
| |
| void V8HeapExplorer::ExtractContextReferences(int entry, Context* context) { |
| if (context == context->declaration_context()) { |
| ScopeInfo* scope_info = context->closure()->shared()->scope_info(); |
| // Add context allocated locals. |
| int context_locals = scope_info->ContextLocalCount(); |
| for (int i = 0; i < context_locals; ++i) { |
| String* local_name = scope_info->ContextLocalName(i); |
| int idx = Context::MIN_CONTEXT_SLOTS + i; |
| SetContextReference(context, entry, local_name, context->get(idx), |
| Context::OffsetOfElementAt(idx)); |
| } |
| if (scope_info->HasFunctionName()) { |
| String* name = scope_info->FunctionName(); |
| VariableMode mode; |
| int idx = scope_info->FunctionContextSlotIndex(name, &mode); |
| if (idx >= 0) { |
| SetContextReference(context, entry, name, context->get(idx), |
| Context::OffsetOfElementAt(idx)); |
| } |
| } |
| } |
| |
| #define EXTRACT_CONTEXT_FIELD(index, type, name) \ |
| SetInternalReference(context, entry, #name, context->get(Context::index), \ |
| FixedArray::OffsetOfElementAt(Context::index)); |
| EXTRACT_CONTEXT_FIELD(CLOSURE_INDEX, JSFunction, closure); |
| EXTRACT_CONTEXT_FIELD(PREVIOUS_INDEX, Context, previous); |
| EXTRACT_CONTEXT_FIELD(EXTENSION_INDEX, Object, extension); |
| EXTRACT_CONTEXT_FIELD(GLOBAL_OBJECT_INDEX, GlobalObject, global); |
| if (context->IsNativeContext()) { |
| TagObject(context->jsfunction_result_caches(), |
| "(context func. result caches)"); |
| TagObject(context->normalized_map_cache(), "(context norm. map cache)"); |
| TagObject(context->runtime_context(), "(runtime context)"); |
| TagObject(context->embedder_data(), "(context data)"); |
| NATIVE_CONTEXT_FIELDS(EXTRACT_CONTEXT_FIELD); |
| #undef EXTRACT_CONTEXT_FIELD |
| for (int i = Context::FIRST_WEAK_SLOT; |
| i < Context::NATIVE_CONTEXT_SLOTS; |
| ++i) { |
| SetWeakReference(context, entry, i, context->get(i), |
| FixedArray::OffsetOfElementAt(i)); |
| } |
| } |
| } |
| |
| |
| void V8HeapExplorer::ExtractMapReferences(int entry, Map* map) { |
| if (map->HasTransitionArray()) { |
| TransitionArray* transitions = map->transitions(); |
| int transitions_entry = GetEntry(transitions)->index(); |
| Object* back_pointer = transitions->back_pointer_storage(); |
| TagObject(back_pointer, "(back pointer)"); |
| SetInternalReference(transitions, transitions_entry, |
| "back_pointer", back_pointer); |
| TagObject(transitions, "(transition array)"); |
| SetInternalReference(map, entry, |
| "transitions", transitions, |
| Map::kTransitionsOrBackPointerOffset); |
| } else { |
| Object* back_pointer = map->GetBackPointer(); |
| TagObject(back_pointer, "(back pointer)"); |
| SetInternalReference(map, entry, |
| "back_pointer", back_pointer, |
| Map::kTransitionsOrBackPointerOffset); |
| } |
| DescriptorArray* descriptors = map->instance_descriptors(); |
| TagObject(descriptors, "(map descriptors)"); |
| SetInternalReference(map, entry, |
| "descriptors", descriptors, |
| Map::kDescriptorsOffset); |
| |
| SetInternalReference(map, entry, |
| "code_cache", map->code_cache(), |
| Map::kCodeCacheOffset); |
| SetInternalReference(map, entry, |
| "prototype", map->prototype(), Map::kPrototypeOffset); |
| SetInternalReference(map, entry, |
| "constructor", map->constructor(), |
| Map::kConstructorOffset); |
| TagObject(map->dependent_code(), "(dependent code)"); |
| SetInternalReference(map, entry, |
| "dependent_code", map->dependent_code(), |
| Map::kDependentCodeOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractSharedFunctionInfoReferences( |
| int entry, SharedFunctionInfo* shared) { |
| HeapObject* obj = shared; |
| SetInternalReference(obj, entry, |
| "name", shared->name(), |
| SharedFunctionInfo::kNameOffset); |
| TagObject(shared->code(), "(code)"); |
| SetInternalReference(obj, entry, |
| "code", shared->code(), |
| SharedFunctionInfo::kCodeOffset); |
| TagObject(shared->scope_info(), "(function scope info)"); |
| SetInternalReference(obj, entry, |
| "scope_info", shared->scope_info(), |
| SharedFunctionInfo::kScopeInfoOffset); |
| SetInternalReference(obj, entry, |
| "instance_class_name", shared->instance_class_name(), |
| SharedFunctionInfo::kInstanceClassNameOffset); |
| SetInternalReference(obj, entry, |
| "script", shared->script(), |
| SharedFunctionInfo::kScriptOffset); |
| TagObject(shared->construct_stub(), "(code)"); |
| SetInternalReference(obj, entry, |
| "construct_stub", shared->construct_stub(), |
| SharedFunctionInfo::kConstructStubOffset); |
| SetInternalReference(obj, entry, |
| "function_data", shared->function_data(), |
| SharedFunctionInfo::kFunctionDataOffset); |
| SetInternalReference(obj, entry, |
| "debug_info", shared->debug_info(), |
| SharedFunctionInfo::kDebugInfoOffset); |
| SetInternalReference(obj, entry, |
| "inferred_name", shared->inferred_name(), |
| SharedFunctionInfo::kInferredNameOffset); |
| SetWeakReference(obj, entry, |
| 1, shared->initial_map(), |
| SharedFunctionInfo::kInitialMapOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractScriptReferences(int entry, Script* script) { |
| HeapObject* obj = script; |
| SetInternalReference(obj, entry, |
| "source", script->source(), |
| Script::kSourceOffset); |
| SetInternalReference(obj, entry, |
| "name", script->name(), |
| Script::kNameOffset); |
| SetInternalReference(obj, entry, |
| "data", script->data(), |
| Script::kDataOffset); |
| SetInternalReference(obj, entry, |
| "context_data", script->context_data(), |
| Script::kContextOffset); |
| TagObject(script->line_ends(), "(script line ends)"); |
| SetInternalReference(obj, entry, |
| "line_ends", script->line_ends(), |
| Script::kLineEndsOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractAccessorPairReferences( |
| int entry, AccessorPair* accessors) { |
| SetInternalReference(accessors, entry, "getter", accessors->getter(), |
| AccessorPair::kGetterOffset); |
| SetInternalReference(accessors, entry, "setter", accessors->setter(), |
| AccessorPair::kSetterOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractCodeCacheReferences( |
| int entry, CodeCache* code_cache) { |
| TagObject(code_cache->default_cache(), "(default code cache)"); |
| SetInternalReference(code_cache, entry, |
| "default_cache", code_cache->default_cache(), |
| CodeCache::kDefaultCacheOffset); |
| TagObject(code_cache->normal_type_cache(), "(code type cache)"); |
| SetInternalReference(code_cache, entry, |
| "type_cache", code_cache->normal_type_cache(), |
| CodeCache::kNormalTypeCacheOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractCodeReferences(int entry, Code* code) { |
| TagObject(code->relocation_info(), "(code relocation info)"); |
| SetInternalReference(code, entry, |
| "relocation_info", code->relocation_info(), |
| Code::kRelocationInfoOffset); |
| SetInternalReference(code, entry, |
| "handler_table", code->handler_table(), |
| Code::kHandlerTableOffset); |
| TagObject(code->deoptimization_data(), "(code deopt data)"); |
| SetInternalReference(code, entry, |
| "deoptimization_data", code->deoptimization_data(), |
| Code::kDeoptimizationDataOffset); |
| if (code->kind() == Code::FUNCTION) { |
| SetInternalReference(code, entry, |
| "type_feedback_info", code->type_feedback_info(), |
| Code::kTypeFeedbackInfoOffset); |
| } |
| SetInternalReference(code, entry, |
| "gc_metadata", code->gc_metadata(), |
| Code::kGCMetadataOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractCellReferences(int entry, Cell* cell) { |
| SetInternalReference(cell, entry, "value", cell->value(), Cell::kValueOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractPropertyCellReferences(int entry, |
| PropertyCell* cell) { |
| ExtractCellReferences(entry, cell); |
| SetInternalReference(cell, entry, "type", cell->type(), |
| PropertyCell::kTypeOffset); |
| SetInternalReference(cell, entry, "dependent_code", cell->dependent_code(), |
| PropertyCell::kDependentCodeOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractAllocationSiteReferences(int entry, |
| AllocationSite* site) { |
| SetInternalReference(site, entry, "transition_info", site->transition_info(), |
| AllocationSite::kTransitionInfoOffset); |
| } |
| |
| |
| void V8HeapExplorer::ExtractClosureReferences(JSObject* js_obj, int entry) { |
| if (!js_obj->IsJSFunction()) return; |
| |
| JSFunction* func = JSFunction::cast(js_obj); |
| if (func->shared()->bound()) { |
| FixedArray* bindings = func->function_bindings(); |
| SetNativeBindReference(js_obj, entry, "bound_this", |
| bindings->get(JSFunction::kBoundThisIndex)); |
| SetNativeBindReference(js_obj, entry, "bound_function", |
| bindings->get(JSFunction::kBoundFunctionIndex)); |
| for (int i = JSFunction::kBoundArgumentsStartIndex; |
| i < bindings->length(); i++) { |
| const char* reference_name = collection_->names()->GetFormatted( |
| "bound_argument_%d", |
| i - JSFunction::kBoundArgumentsStartIndex); |
| SetNativeBindReference(js_obj, entry, reference_name, |
| bindings->get(i)); |
| } |
| } |
| } |
| |
| |
| void V8HeapExplorer::ExtractPropertyReferences(JSObject* js_obj, int entry) { |
| if (js_obj->HasFastProperties()) { |
| DescriptorArray* descs = js_obj->map()->instance_descriptors(); |
| int real_size = js_obj->map()->NumberOfOwnDescriptors(); |
| for (int i = 0; i < real_size; i++) { |
| switch (descs->GetType(i)) { |
| case FIELD: { |
| int index = descs->GetFieldIndex(i); |
| |
| Name* k = descs->GetKey(i); |
| if (index < js_obj->map()->inobject_properties()) { |
| Object* value = js_obj->InObjectPropertyAt(index); |
| if (k != heap_->hidden_string()) { |
| SetPropertyReference( |
| js_obj, entry, |
| k, value, |
| NULL, |
| js_obj->GetInObjectPropertyOffset(index)); |
| } else { |
| TagObject(value, "(hidden properties)"); |
| SetInternalReference( |
| js_obj, entry, |
| "hidden_properties", value, |
| js_obj->GetInObjectPropertyOffset(index)); |
| } |
| } else { |
| Object* value = js_obj->RawFastPropertyAt(index); |
| if (k != heap_->hidden_string()) { |
| SetPropertyReference(js_obj, entry, k, value); |
| } else { |
| TagObject(value, "(hidden properties)"); |
| SetInternalReference(js_obj, entry, "hidden_properties", value); |
| } |
| } |
| break; |
| } |
| case CONSTANT: |
| SetPropertyReference( |
| js_obj, entry, |
| descs->GetKey(i), descs->GetConstant(i)); |
| break; |
| case CALLBACKS: |
| ExtractAccessorPairProperty( |
| js_obj, entry, |
| descs->GetKey(i), descs->GetValue(i)); |
| break; |
| case NORMAL: // only in slow mode |
| case HANDLER: // only in lookup results, not in descriptors |
| case INTERCEPTOR: // only in lookup results, not in descriptors |
| break; |
| case TRANSITION: |
| case NONEXISTENT: |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } else { |
| NameDictionary* dictionary = js_obj->property_dictionary(); |
| int length = dictionary->Capacity(); |
| for (int i = 0; i < length; ++i) { |
| Object* k = dictionary->KeyAt(i); |
| if (dictionary->IsKey(k)) { |
| Object* target = dictionary->ValueAt(i); |
| // We assume that global objects can only have slow properties. |
| Object* value = target->IsPropertyCell() |
| ? PropertyCell::cast(target)->value() |
| : target; |
| if (k == heap_->hidden_string()) { |
| TagObject(value, "(hidden properties)"); |
| SetInternalReference(js_obj, entry, "hidden_properties", value); |
| continue; |
| } |
| if (ExtractAccessorPairProperty(js_obj, entry, k, value)) continue; |
| SetPropertyReference(js_obj, entry, String::cast(k), value); |
| } |
| } |
| } |
| } |
| |
| |
| bool V8HeapExplorer::ExtractAccessorPairProperty( |
| JSObject* js_obj, int entry, Object* key, Object* callback_obj) { |
| if (!callback_obj->IsAccessorPair()) return false; |
| AccessorPair* accessors = AccessorPair::cast(callback_obj); |
| Object* getter = accessors->getter(); |
| if (!getter->IsOddball()) { |
| SetPropertyReference(js_obj, entry, String::cast(key), getter, "get %s"); |
| } |
| Object* setter = accessors->setter(); |
| if (!setter->IsOddball()) { |
| SetPropertyReference(js_obj, entry, String::cast(key), setter, "set %s"); |
| } |
| return true; |
| } |
| |
| |
| void V8HeapExplorer::ExtractElementReferences(JSObject* js_obj, int entry) { |
| if (js_obj->HasFastObjectElements()) { |
| FixedArray* elements = FixedArray::cast(js_obj->elements()); |
| int length = js_obj->IsJSArray() ? |
| Smi::cast(JSArray::cast(js_obj)->length())->value() : |
| elements->length(); |
| for (int i = 0; i < length; ++i) { |
| if (!elements->get(i)->IsTheHole()) { |
| SetElementReference(js_obj, entry, i, elements->get(i)); |
| } |
| } |
| } else if (js_obj->HasDictionaryElements()) { |
| SeededNumberDictionary* dictionary = js_obj->element_dictionary(); |
| int length = dictionary->Capacity(); |
| for (int i = 0; i < length; ++i) { |
| Object* k = dictionary->KeyAt(i); |
| if (dictionary->IsKey(k)) { |
| ASSERT(k->IsNumber()); |
| uint32_t index = static_cast<uint32_t>(k->Number()); |
| SetElementReference(js_obj, entry, index, dictionary->ValueAt(i)); |
| } |
| } |
| } |
| } |
| |
| |
| void V8HeapExplorer::ExtractInternalReferences(JSObject* js_obj, int entry) { |
| int length = js_obj->GetInternalFieldCount(); |
| for (int i = 0; i < length; ++i) { |
| Object* o = js_obj->GetInternalField(i); |
| SetInternalReference( |
| js_obj, entry, i, o, js_obj->GetInternalFieldOffset(i)); |
| } |
| } |
| |
| |
| String* V8HeapExplorer::GetConstructorName(JSObject* object) { |
| Heap* heap = object->GetHeap(); |
| if (object->IsJSFunction()) return heap->closure_string(); |
| String* constructor_name = object->constructor_name(); |
| if (constructor_name == heap->Object_string()) { |
| // Look up an immediate "constructor" property, if it is a function, |
| // return its name. This is for instances of binding objects, which |
| // have prototype constructor type "Object". |
| Object* constructor_prop = NULL; |
| LookupResult result(heap->isolate()); |
| object->LocalLookupRealNamedProperty(heap->constructor_string(), &result); |
| if (!result.IsFound()) return object->constructor_name(); |
| |
| constructor_prop = result.GetLazyValue(); |
| if (constructor_prop->IsJSFunction()) { |
| Object* maybe_name = |
| JSFunction::cast(constructor_prop)->shared()->name(); |
| if (maybe_name->IsString()) { |
| String* name = String::cast(maybe_name); |
| if (name->length() > 0) return name; |
| } |
| } |
| } |
| return object->constructor_name(); |
| } |
| |
| |
| HeapEntry* V8HeapExplorer::GetEntry(Object* obj) { |
| if (!obj->IsHeapObject()) return NULL; |
| return filler_->FindOrAddEntry(obj, this); |
| } |
| |
| |
| class RootsReferencesExtractor : public ObjectVisitor { |
| private: |
| struct IndexTag { |
| IndexTag(int index, VisitorSynchronization::SyncTag tag) |
| : index(index), tag(tag) { } |
| int index; |
| VisitorSynchronization::SyncTag tag; |
| }; |
| |
| public: |
| RootsReferencesExtractor() |
| : collecting_all_references_(false), |
| previous_reference_count_(0) { |
| } |
| |
| void VisitPointers(Object** start, Object** end) { |
| if (collecting_all_references_) { |
| for (Object** p = start; p < end; p++) all_references_.Add(*p); |
| } else { |
| for (Object** p = start; p < end; p++) strong_references_.Add(*p); |
| } |
| } |
| |
| void SetCollectingAllReferences() { collecting_all_references_ = true; } |
| |
| void FillReferences(V8HeapExplorer* explorer) { |
| ASSERT(strong_references_.length() <= all_references_.length()); |
| for (int i = 0; i < reference_tags_.length(); ++i) { |
| explorer->SetGcRootsReference(reference_tags_[i].tag); |
| } |
| int strong_index = 0, all_index = 0, tags_index = 0; |
| while (all_index < all_references_.length()) { |
| if (strong_index < strong_references_.length() && |
| strong_references_[strong_index] == all_references_[all_index]) { |
| explorer->SetGcSubrootReference(reference_tags_[tags_index].tag, |
| false, |
| all_references_[all_index++]); |
| ++strong_index; |
| } else { |
| explorer->SetGcSubrootReference(reference_tags_[tags_index].tag, |
| true, |
| all_references_[all_index++]); |
| } |
| if (reference_tags_[tags_index].index == all_index) ++tags_index; |
| } |
| } |
| |
| void Synchronize(VisitorSynchronization::SyncTag tag) { |
| if (collecting_all_references_ && |
| previous_reference_count_ != all_references_.length()) { |
| previous_reference_count_ = all_references_.length(); |
| reference_tags_.Add(IndexTag(previous_reference_count_, tag)); |
| } |
| } |
| |
| private: |
| bool collecting_all_references_; |
| List<Object*> strong_references_; |
| List<Object*> all_references_; |
| int previous_reference_count_; |
| List<IndexTag> reference_tags_; |
| }; |
| |
| |
| bool V8HeapExplorer::IterateAndExtractReferences( |
| SnapshotFillerInterface* filler) { |
| HeapIterator iterator(heap_, HeapIterator::kFilterUnreachable); |
| |
| filler_ = filler; |
| bool interrupted = false; |
| |
| // Heap iteration with filtering must be finished in any case. |
| for (HeapObject* obj = iterator.next(); |
| obj != NULL; |
| obj = iterator.next(), progress_->ProgressStep()) { |
| if (!interrupted) { |
| ExtractReferences(obj); |
| if (!progress_->ProgressReport(false)) interrupted = true; |
| } |
| } |
| if (interrupted) { |
| filler_ = NULL; |
| return false; |
| } |
| |
| SetRootGcRootsReference(); |
| RootsReferencesExtractor extractor; |
| heap_->IterateRoots(&extractor, VISIT_ONLY_STRONG); |
| extractor.SetCollectingAllReferences(); |
| heap_->IterateRoots(&extractor, VISIT_ALL); |
| extractor.FillReferences(this); |
| filler_ = NULL; |
| return progress_->ProgressReport(true); |
| } |
| |
| |
| bool V8HeapExplorer::IsEssentialObject(Object* object) { |
| return object->IsHeapObject() |
| && !object->IsOddball() |
| && object != heap_->empty_byte_array() |
| && object != heap_->empty_fixed_array() |
| && object != heap_->empty_descriptor_array() |
| && object != heap_->fixed_array_map() |
| && object != heap_->cell_map() |
| && object != heap_->global_property_cell_map() |
| && object != heap_->shared_function_info_map() |
| && object != heap_->free_space_map() |
| && object != heap_->one_pointer_filler_map() |
| && object != heap_->two_pointer_filler_map(); |
| } |
| |
| |
| void V8HeapExplorer::SetContextReference(HeapObject* parent_obj, |
| int parent_entry, |
| String* reference_name, |
| Object* child_obj, |
| int field_offset) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry != NULL) { |
| filler_->SetNamedReference(HeapGraphEdge::kContextVariable, |
| parent_entry, |
| collection_->names()->GetName(reference_name), |
| child_entry); |
| IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset); |
| } |
| } |
| |
| |
| void V8HeapExplorer::SetNativeBindReference(HeapObject* parent_obj, |
| int parent_entry, |
| const char* reference_name, |
| Object* child_obj) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry != NULL) { |
| filler_->SetNamedReference(HeapGraphEdge::kShortcut, |
| parent_entry, |
| reference_name, |
| child_entry); |
| } |
| } |
| |
| |
| void V8HeapExplorer::SetElementReference(HeapObject* parent_obj, |
| int parent_entry, |
| int index, |
| Object* child_obj) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry != NULL) { |
| filler_->SetIndexedReference(HeapGraphEdge::kElement, |
| parent_entry, |
| index, |
| child_entry); |
| } |
| } |
| |
| |
| void V8HeapExplorer::SetInternalReference(HeapObject* parent_obj, |
| int parent_entry, |
| const char* reference_name, |
| Object* child_obj, |
| int field_offset) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry == NULL) return; |
| if (IsEssentialObject(child_obj)) { |
| filler_->SetNamedReference(HeapGraphEdge::kInternal, |
| parent_entry, |
| reference_name, |
| child_entry); |
| } |
| IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset); |
| } |
| |
| |
| void V8HeapExplorer::SetInternalReference(HeapObject* parent_obj, |
| int parent_entry, |
| int index, |
| Object* child_obj, |
| int field_offset) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry == NULL) return; |
| if (IsEssentialObject(child_obj)) { |
| filler_->SetNamedReference(HeapGraphEdge::kInternal, |
| parent_entry, |
| collection_->names()->GetName(index), |
| child_entry); |
| } |
| IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset); |
| } |
| |
| |
| void V8HeapExplorer::SetHiddenReference(HeapObject* parent_obj, |
| int parent_entry, |
| int index, |
| Object* child_obj) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry != NULL && IsEssentialObject(child_obj)) { |
| filler_->SetIndexedReference(HeapGraphEdge::kHidden, |
| parent_entry, |
| index, |
| child_entry); |
| } |
| } |
| |
| |
| void V8HeapExplorer::SetWeakReference(HeapObject* parent_obj, |
| int parent_entry, |
| int index, |
| Object* child_obj, |
| int field_offset) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry == NULL) return; |
| if (IsEssentialObject(child_obj)) { |
| filler_->SetIndexedReference(HeapGraphEdge::kWeak, |
| parent_entry, |
| index, |
| child_entry); |
| } |
| IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset); |
| } |
| |
| |
| void V8HeapExplorer::SetPropertyReference(HeapObject* parent_obj, |
| int parent_entry, |
| Name* reference_name, |
| Object* child_obj, |
| const char* name_format_string, |
| int field_offset) { |
| ASSERT(parent_entry == GetEntry(parent_obj)->index()); |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry != NULL) { |
| HeapGraphEdge::Type type = |
| reference_name->IsSymbol() || String::cast(reference_name)->length() > 0 |
| ? HeapGraphEdge::kProperty : HeapGraphEdge::kInternal; |
| const char* name = name_format_string != NULL && reference_name->IsString() |
| ? collection_->names()->GetFormatted( |
| name_format_string, |
| *String::cast(reference_name)->ToCString( |
| DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL)) : |
| collection_->names()->GetName(reference_name); |
| |
| filler_->SetNamedReference(type, |
| parent_entry, |
| name, |
| child_entry); |
| IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset); |
| } |
| } |
| |
| |
| void V8HeapExplorer::SetRootGcRootsReference() { |
| filler_->SetIndexedAutoIndexReference( |
| HeapGraphEdge::kElement, |
| snapshot_->root()->index(), |
| snapshot_->gc_roots()); |
| } |
| |
| |
| void V8HeapExplorer::SetUserGlobalReference(Object* child_obj) { |
| HeapEntry* child_entry = GetEntry(child_obj); |
| ASSERT(child_entry != NULL); |
| filler_->SetNamedAutoIndexReference( |
| HeapGraphEdge::kShortcut, |
| snapshot_->root()->index(), |
| child_entry); |
| } |
| |
| |
| void V8HeapExplorer::SetGcRootsReference(VisitorSynchronization::SyncTag tag) { |
| filler_->SetIndexedAutoIndexReference( |
| HeapGraphEdge::kElement, |
| snapshot_->gc_roots()->index(), |
| snapshot_->gc_subroot(tag)); |
| } |
| |
| |
| void V8HeapExplorer::SetGcSubrootReference( |
| VisitorSynchronization::SyncTag tag, bool is_weak, Object* child_obj) { |
| HeapEntry* child_entry = GetEntry(child_obj); |
| if (child_entry != NULL) { |
| const char* name = GetStrongGcSubrootName(child_obj); |
| if (name != NULL) { |
| filler_->SetNamedReference( |
| HeapGraphEdge::kInternal, |
| snapshot_->gc_subroot(tag)->index(), |
| name, |
| child_entry); |
| } else { |
| filler_->SetIndexedAutoIndexReference( |
| is_weak ? HeapGraphEdge::kWeak : HeapGraphEdge::kElement, |
| snapshot_->gc_subroot(tag)->index(), |
| child_entry); |
| } |
| |
| // Add a shortcut to JS global object reference at snapshot root. |
| if (child_obj->IsNativeContext()) { |
| Context* context = Context::cast(child_obj); |
| GlobalObject* global = context->global_object(); |
| if (global->IsJSGlobalObject()) { |
| bool is_debug_object = false; |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| is_debug_object = heap_->isolate()->debug()->IsDebugGlobal(global); |
| #endif |
| if (!is_debug_object && !user_roots_.Contains(global)) { |
| user_roots_.Insert(global); |
| SetUserGlobalReference(global); |
| } |
| } |
| } |
| } |
| } |
| |
| |
| const char* V8HeapExplorer::GetStrongGcSubrootName(Object* object) { |
| if (strong_gc_subroot_names_.is_empty()) { |
| #define NAME_ENTRY(name) strong_gc_subroot_names_.SetTag(heap_->name(), #name); |
| #define ROOT_NAME(type, name, camel_name) NAME_ENTRY(name) |
| STRONG_ROOT_LIST(ROOT_NAME) |
| #undef ROOT_NAME |
| #define STRUCT_MAP_NAME(NAME, Name, name) NAME_ENTRY(name##_map) |
| STRUCT_LIST(STRUCT_MAP_NAME) |
| #undef STRUCT_MAP_NAME |
| #define STRING_NAME(name, str) NAME_ENTRY(name) |
| INTERNALIZED_STRING_LIST(STRING_NAME) |
| #undef STRING_NAME |
| #undef NAME_ENTRY |
| CHECK(!strong_gc_subroot_names_.is_empty()); |
| } |
| return strong_gc_subroot_names_.GetTag(object); |
| } |
| |
| |
| void V8HeapExplorer::TagObject(Object* obj, const char* tag) { |
| if (IsEssentialObject(obj)) { |
| HeapEntry* entry = GetEntry(obj); |
| if (entry->name()[0] == '\0') { |
| entry->set_name(tag); |
| } |
| } |
| } |
| |
| |
| class GlobalObjectsEnumerator : public ObjectVisitor { |
| public: |
| virtual void VisitPointers(Object** start, Object** end) { |
| for (Object** p = start; p < end; p++) { |
| if ((*p)->IsNativeContext()) { |
| Context* context = Context::cast(*p); |
| JSObject* proxy = context->global_proxy(); |
| if (proxy->IsJSGlobalProxy()) { |
| Object* global = proxy->map()->prototype(); |
| if (global->IsJSGlobalObject()) { |
| objects_.Add(Handle<JSGlobalObject>(JSGlobalObject::cast(global))); |
| } |
| } |
| } |
| } |
| } |
| int count() { return objects_.length(); } |
| Handle<JSGlobalObject>& at(int i) { return objects_[i]; } |
| |
| private: |
| List<Handle<JSGlobalObject> > objects_; |
| }; |
| |
| |
| // Modifies heap. Must not be run during heap traversal. |
| void V8HeapExplorer::TagGlobalObjects() { |
| Isolate* isolate = heap_->isolate(); |
| HandleScope scope(isolate); |
| GlobalObjectsEnumerator enumerator; |
| isolate->global_handles()->IterateAllRoots(&enumerator); |
| const char** urls = NewArray<const char*>(enumerator.count()); |
| for (int i = 0, l = enumerator.count(); i < l; ++i) { |
| if (global_object_name_resolver_) { |
| HandleScope scope(isolate); |
| Handle<JSGlobalObject> global_obj = enumerator.at(i); |
| urls[i] = global_object_name_resolver_->GetName( |
| Utils::ToLocal(Handle<JSObject>::cast(global_obj))); |
| } else { |
| urls[i] = NULL; |
| } |
| } |
| |
| DisallowHeapAllocation no_allocation; |
| for (int i = 0, l = enumerator.count(); i < l; ++i) { |
| objects_tags_.SetTag(*enumerator.at(i), urls[i]); |
| } |
| |
| DeleteArray(urls); |
| } |
| |
| |
| class GlobalHandlesExtractor : public ObjectVisitor { |
| public: |
| explicit GlobalHandlesExtractor(NativeObjectsExplorer* explorer) |
| : explorer_(explorer) {} |
| virtual ~GlobalHandlesExtractor() {} |
| virtual void VisitPointers(Object** start, Object** end) { |
| UNREACHABLE(); |
| } |
| virtual void VisitEmbedderReference(Object** p, uint16_t class_id) { |
| explorer_->VisitSubtreeWrapper(p, class_id); |
| } |
| private: |
| NativeObjectsExplorer* explorer_; |
| }; |
| |
| |
| class BasicHeapEntriesAllocator : public HeapEntriesAllocator { |
| public: |
| BasicHeapEntriesAllocator( |
| HeapSnapshot* snapshot, |
| HeapEntry::Type entries_type) |
| : snapshot_(snapshot), |
| collection_(snapshot_->collection()), |
| entries_type_(entries_type) { |
| } |
| virtual HeapEntry* AllocateEntry(HeapThing ptr); |
| private: |
| HeapSnapshot* snapshot_; |
| HeapSnapshotsCollection* collection_; |
| HeapEntry::Type entries_type_; |
| }; |
| |
| |
| HeapEntry* BasicHeapEntriesAllocator::AllocateEntry(HeapThing ptr) { |
| v8::RetainedObjectInfo* info = reinterpret_cast<v8::RetainedObjectInfo*>(ptr); |
| intptr_t elements = info->GetElementCount(); |
| intptr_t size = info->GetSizeInBytes(); |
| const char* name = elements != -1 |
| ? collection_->names()->GetFormatted( |
| "%s / %" V8_PTR_PREFIX "d entries", info->GetLabel(), elements) |
| : collection_->names()->GetCopy(info->GetLabel()); |
| return snapshot_->AddEntry( |
| entries_type_, |
| name, |
| HeapObjectsMap::GenerateId(collection_->heap(), info), |
| size != -1 ? static_cast<int>(size) : 0); |
| } |
| |
| |
| NativeObjectsExplorer::NativeObjectsExplorer( |
| HeapSnapshot* snapshot, |
| SnapshottingProgressReportingInterface* progress) |
| : isolate_(snapshot->collection()->heap()->isolate()), |
| snapshot_(snapshot), |
| collection_(snapshot_->collection()), |
| progress_(progress), |
| embedder_queried_(false), |
| objects_by_info_(RetainedInfosMatch), |
| native_groups_(StringsMatch), |
| filler_(NULL) { |
| synthetic_entries_allocator_ = |
| new BasicHeapEntriesAllocator(snapshot, HeapEntry::kSynthetic); |
| native_entries_allocator_ = |
| new BasicHeapEntriesAllocator(snapshot, HeapEntry::kNative); |
| } |
| |
| |
| NativeObjectsExplorer::~NativeObjectsExplorer() { |
| for (HashMap::Entry* p = objects_by_info_.Start(); |
| p != NULL; |
| p = objects_by_info_.Next(p)) { |
| v8::RetainedObjectInfo* info = |
| reinterpret_cast<v8::RetainedObjectInfo*>(p->key); |
| info->Dispose(); |
| List<HeapObject*>* objects = |
| reinterpret_cast<List<HeapObject*>* >(p->value); |
| delete objects; |
| } |
| for (HashMap::Entry* p = native_groups_.Start(); |
| p != NULL; |
| p = native_groups_.Next(p)) { |
| v8::RetainedObjectInfo* info = |
| reinterpret_cast<v8::RetainedObjectInfo*>(p->value); |
| info->Dispose(); |
| } |
| delete synthetic_entries_allocator_; |
| delete native_entries_allocator_; |
| } |
| |
| |
| int NativeObjectsExplorer::EstimateObjectsCount() { |
| FillRetainedObjects(); |
| return objects_by_info_.occupancy(); |
| } |
| |
| |
| void NativeObjectsExplorer::FillRetainedObjects() { |
| if (embedder_queried_) return; |
| Isolate* isolate = isolate_; |
| const GCType major_gc_type = kGCTypeMarkSweepCompact; |
| // Record objects that are joined into ObjectGroups. |
| isolate->heap()->CallGCPrologueCallbacks( |
| major_gc_type, kGCCallbackFlagConstructRetainedObjectInfos); |
| List<ObjectGroup*>* groups = isolate->global_handles()->object_groups(); |
| for (int i = 0; i < groups->length(); ++i) { |
| ObjectGroup* group = groups->at(i); |
| if (group->info == NULL) continue; |
| List<HeapObject*>* list = GetListMaybeDisposeInfo(group->info); |
| for (size_t j = 0; j < group->length; ++j) { |
| HeapObject* obj = HeapObject::cast(*group->objects[j]); |
| list->Add(obj); |
| in_groups_.Insert(obj); |
| } |
| group->info = NULL; // Acquire info object ownership. |
| } |
| isolate->global_handles()->RemoveObjectGroups(); |
| isolate->heap()->CallGCEpilogueCallbacks(major_gc_type); |
| // Record objects that are not in ObjectGroups, but have class ID. |
| GlobalHandlesExtractor extractor(this); |
| isolate->global_handles()->IterateAllRootsWithClassIds(&extractor); |
| embedder_queried_ = true; |
| } |
| |
| |
| void NativeObjectsExplorer::FillImplicitReferences() { |
| Isolate* isolate = isolate_; |
| List<ImplicitRefGroup*>* groups = |
| isolate->global_handles()->implicit_ref_groups(); |
| for (int i = 0; i < groups->length(); ++i) { |
| ImplicitRefGroup* group = groups->at(i); |
| HeapObject* parent = *group->parent; |
| int parent_entry = |
| filler_->FindOrAddEntry(parent, native_entries_allocator_)->index(); |
| ASSERT(parent_entry != HeapEntry::kNoEntry); |
| Object*** children = group->children; |
| for (size_t j = 0; j < group->length; ++j) { |
| Object* child = *children[j]; |
| HeapEntry* child_entry = |
| filler_->FindOrAddEntry(child, native_entries_allocator_); |
| filler_->SetNamedReference( |
| HeapGraphEdge::kInternal, |
| parent_entry, |
| "native", |
| child_entry); |
| } |
| } |
| isolate->global_handles()->RemoveImplicitRefGroups(); |
| } |
| |
| List<HeapObject*>* NativeObjectsExplorer::GetListMaybeDisposeInfo( |
| v8::RetainedObjectInfo* info) { |
| HashMap::Entry* entry = |
| objects_by_info_.Lookup(info, InfoHash(info), true); |
| if (entry->value != NULL) { |
| info->Dispose(); |
| } else { |
| entry->value = new List<HeapObject*>(4); |
| } |
| return reinterpret_cast<List<HeapObject*>* >(entry->value); |
| } |
| |
| |
| bool NativeObjectsExplorer::IterateAndExtractReferences( |
| SnapshotFillerInterface* filler) { |
| filler_ = filler; |
| FillRetainedObjects(); |
| FillImplicitReferences(); |
| if (EstimateObjectsCount() > 0) { |
| for (HashMap::Entry* p = objects_by_info_.Start(); |
| p != NULL; |
| p = objects_by_info_.Next(p)) { |
| v8::RetainedObjectInfo* info = |
| reinterpret_cast<v8::RetainedObjectInfo*>(p->key); |
| SetNativeRootReference(info); |
| List<HeapObject*>* objects = |
| reinterpret_cast<List<HeapObject*>* >(p->value); |
| for (int i = 0; i < objects->length(); ++i) { |
| SetWrapperNativeReferences(objects->at(i), info); |
| } |
| } |
| SetRootNativeRootsReference(); |
| } |
| filler_ = NULL; |
| return true; |
| } |
| |
| |
| class NativeGroupRetainedObjectInfo : public v8::RetainedObjectInfo { |
| public: |
| explicit NativeGroupRetainedObjectInfo(const char* label) |
| : disposed_(false), |
| hash_(reinterpret_cast<intptr_t>(label)), |
| label_(label) { |
| } |
| |
| virtual ~NativeGroupRetainedObjectInfo() {} |
| virtual void Dispose() { |
| CHECK(!disposed_); |
| disposed_ = true; |
| delete this; |
| } |
| virtual bool IsEquivalent(RetainedObjectInfo* other) { |
| return hash_ == other->GetHash() && !strcmp(label_, other->GetLabel()); |
| } |
| virtual intptr_t GetHash() { return hash_; } |
| virtual const char* GetLabel() { return label_; } |
| |
| private: |
| bool disposed_; |
| intptr_t hash_; |
| const char* label_; |
| }; |
| |
| |
| NativeGroupRetainedObjectInfo* NativeObjectsExplorer::FindOrAddGroupInfo( |
| const char* label) { |
| const char* label_copy = collection_->names()->GetCopy(label); |
| uint32_t hash = StringHasher::HashSequentialString( |
| label_copy, |
| static_cast<int>(strlen(label_copy)), |
| isolate_->heap()->HashSeed()); |
| HashMap::Entry* entry = native_groups_.Lookup(const_cast<char*>(label_copy), |
| hash, true); |
| if (entry->value == NULL) { |
| entry->value = new NativeGroupRetainedObjectInfo(label); |
| } |
| return static_cast<NativeGroupRetainedObjectInfo*>(entry->value); |
| } |
| |
| |
| void NativeObjectsExplorer::SetNativeRootReference( |
| v8::RetainedObjectInfo* info) { |
| HeapEntry* child_entry = |
| filler_->FindOrAddEntry(info, native_entries_allocator_); |
| ASSERT(child_entry != NULL); |
| NativeGroupRetainedObjectInfo* group_info = |
| FindOrAddGroupInfo(info->GetGroupLabel()); |
| HeapEntry* group_entry = |
| filler_->FindOrAddEntry(group_info, synthetic_entries_allocator_); |
| filler_->SetNamedAutoIndexReference( |
| HeapGraphEdge::kInternal, |
| group_entry->index(), |
| child_entry); |
| } |
| |
| |
| void NativeObjectsExplorer::SetWrapperNativeReferences( |
| HeapObject* wrapper, v8::RetainedObjectInfo* info) { |
| HeapEntry* wrapper_entry = filler_->FindEntry(wrapper); |
| ASSERT(wrapper_entry != NULL); |
| HeapEntry* info_entry = |
| filler_->FindOrAddEntry(info, native_entries_allocator_); |
| ASSERT(info_entry != NULL); |
| filler_->SetNamedReference(HeapGraphEdge::kInternal, |
| wrapper_entry->index(), |
| "native", |
| info_entry); |
| filler_->SetIndexedAutoIndexReference(HeapGraphEdge::kElement, |
| info_entry->index(), |
| wrapper_entry); |
| } |
| |
| |
| void NativeObjectsExplorer::SetRootNativeRootsReference() { |
| for (HashMap::Entry* entry = native_groups_.Start(); |
| entry; |
| entry = native_groups_.Next(entry)) { |
| NativeGroupRetainedObjectInfo* group_info = |
| static_cast<NativeGroupRetainedObjectInfo*>(entry->value); |
| HeapEntry* group_entry = |
| filler_->FindOrAddEntry(group_info, native_entries_allocator_); |
| ASSERT(group_entry != NULL); |
| filler_->SetIndexedAutoIndexReference( |
| HeapGraphEdge::kElement, |
| snapshot_->root()->index(), |
| group_entry); |
| } |
| } |
| |
| |
| void NativeObjectsExplorer::VisitSubtreeWrapper(Object** p, uint16_t class_id) { |
| if (in_groups_.Contains(*p)) return; |
| Isolate* isolate = isolate_; |
| v8::RetainedObjectInfo* info = |
| isolate->heap_profiler()->ExecuteWrapperClassCallback(class_id, p); |
| if (info == NULL) return; |
| GetListMaybeDisposeInfo(info)->Add(HeapObject::cast(*p)); |
| } |
| |
| |
| class SnapshotFiller : public SnapshotFillerInterface { |
| public: |
| explicit SnapshotFiller(HeapSnapshot* snapshot, HeapEntriesMap* entries) |
| : snapshot_(snapshot), |
| collection_(snapshot->collection()), |
| entries_(entries) { } |
| HeapEntry* AddEntry(HeapThing ptr, HeapEntriesAllocator* allocator) { |
| HeapEntry* entry = allocator->AllocateEntry(ptr); |
| entries_->Pair(ptr, entry->index()); |
| return entry; |
| } |
| HeapEntry* FindEntry(HeapThing ptr) { |
| int index = entries_->Map(ptr); |
| return index != HeapEntry::kNoEntry ? &snapshot_->entries()[index] : NULL; |
| } |
| HeapEntry* FindOrAddEntry(HeapThing ptr, HeapEntriesAllocator* allocator) { |
| HeapEntry* entry = FindEntry(ptr); |
| return entry != NULL ? entry : AddEntry(ptr, allocator); |
| } |
| void SetIndexedReference(HeapGraphEdge::Type type, |
| int parent, |
| int index, |
| HeapEntry* child_entry) { |
| HeapEntry* parent_entry = &snapshot_->entries()[parent]; |
| parent_entry->SetIndexedReference(type, index, child_entry); |
| } |
| void SetIndexedAutoIndexReference(HeapGraphEdge::Type type, |
| int parent, |
| HeapEntry* child_entry) { |
| HeapEntry* parent_entry = &snapshot_->entries()[parent]; |
| int index = parent_entry->children_count() + 1; |
| parent_entry->SetIndexedReference(type, index, child_entry); |
| } |
| void SetNamedReference(HeapGraphEdge::Type type, |
| int parent, |
| const char* reference_name, |
| HeapEntry* child_entry) { |
| HeapEntry* parent_entry = &snapshot_->entries()[parent]; |
| parent_entry->SetNamedReference(type, reference_name, child_entry); |
| } |
| void SetNamedAutoIndexReference(HeapGraphEdge::Type type, |
| int parent, |
| HeapEntry* child_entry) { |
| HeapEntry* parent_entry = &snapshot_->entries()[parent]; |
| int index = parent_entry->children_count() + 1; |
| parent_entry->SetNamedReference( |
| type, |
| collection_->names()->GetName(index), |
| child_entry); |
| } |
| |
| private: |
| HeapSnapshot* snapshot_; |
| HeapSnapshotsCollection* collection_; |
| HeapEntriesMap* entries_; |
| }; |
| |
| |
| HeapSnapshotGenerator::HeapSnapshotGenerator( |
| HeapSnapshot* snapshot, |
| v8::ActivityControl* control, |
| v8::HeapProfiler::ObjectNameResolver* resolver, |
| Heap* heap) |
| : snapshot_(snapshot), |
| control_(control), |
| v8_heap_explorer_(snapshot_, this, resolver), |
| dom_explorer_(snapshot_, this), |
| heap_(heap) { |
| } |
| |
| |
| bool HeapSnapshotGenerator::GenerateSnapshot() { |
| v8_heap_explorer_.TagGlobalObjects(); |
| |
| // TODO(1562) Profiler assumes that any object that is in the heap after |
| // full GC is reachable from the root when computing dominators. |
| // This is not true for weakly reachable objects. |
| // As a temporary solution we call GC twice. |
| heap_->CollectAllGarbage( |
| Heap::kMakeHeapIterableMask, |
| "HeapSnapshotGenerator::GenerateSnapshot"); |
| heap_->CollectAllGarbage( |
| Heap::kMakeHeapIterableMask, |
| "HeapSnapshotGenerator::GenerateSnapshot"); |
| |
| #ifdef VERIFY_HEAP |
| Heap* debug_heap = heap_; |
| CHECK(!debug_heap->old_data_space()->was_swept_conservatively()); |
| CHECK(!debug_heap->old_pointer_space()->was_swept_conservatively()); |
| CHECK(!debug_heap->code_space()->was_swept_conservatively()); |
| CHECK(!debug_heap->cell_space()->was_swept_conservatively()); |
| CHECK(!debug_heap->property_cell_space()-> |
| was_swept_conservatively()); |
| CHECK(!debug_heap->map_space()->was_swept_conservatively()); |
| #endif |
| |
| // The following code uses heap iterators, so we want the heap to be |
| // stable. It should follow TagGlobalObjects as that can allocate. |
| DisallowHeapAllocation no_alloc; |
| |
| #ifdef VERIFY_HEAP |
| debug_heap->Verify(); |
| #endif |
| |
| SetProgressTotal(1); // 1 pass. |
| |
| #ifdef VERIFY_HEAP |
| debug_heap->Verify(); |
| #endif |
| |
| if (!FillReferences()) return false; |
| |
| snapshot_->FillChildren(); |
| snapshot_->RememberLastJSObjectId(); |
| |
| progress_counter_ = progress_total_; |
| if (!ProgressReport(true)) return false; |
| return true; |
| } |
| |
| |
| void HeapSnapshotGenerator::ProgressStep() { |
| ++progress_counter_; |
| } |
| |
| |
| bool HeapSnapshotGenerator::ProgressReport(bool force) { |
| const int kProgressReportGranularity = 10000; |
| if (control_ != NULL |
| && (force || progress_counter_ % kProgressReportGranularity == 0)) { |
| return |
| control_->ReportProgressValue(progress_counter_, progress_total_) == |
| v8::ActivityControl::kContinue; |
| } |
| return true; |
| } |
| |
| |
| void HeapSnapshotGenerator::SetProgressTotal(int iterations_count) { |
| if (control_ == NULL) return; |
| HeapIterator iterator(heap_, HeapIterator::kFilterUnreachable); |
| progress_total_ = iterations_count * ( |
| v8_heap_explorer_.EstimateObjectsCount(&iterator) + |
| dom_explorer_.EstimateObjectsCount()); |
| progress_counter_ = 0; |
| } |
| |
| |
| bool HeapSnapshotGenerator::FillReferences() { |
| SnapshotFiller filler(snapshot_, &entries_); |
| v8_heap_explorer_.AddRootEntries(&filler); |
| return v8_heap_explorer_.IterateAndExtractReferences(&filler) |
| && dom_explorer_.IterateAndExtractReferences(&filler); |
| } |
| |
| |
| template<int bytes> struct MaxDecimalDigitsIn; |
| template<> struct MaxDecimalDigitsIn<4> { |
| static const int kSigned = 11; |
| static const int kUnsigned = 10; |
| }; |
| template<> struct MaxDecimalDigitsIn<8> { |
| static const int kSigned = 20; |
| static const int kUnsigned = 20; |
| }; |
| |
| |
| class OutputStreamWriter { |
| public: |
| explicit OutputStreamWriter(v8::OutputStream* stream) |
| : stream_(stream), |
| chunk_size_(stream->GetChunkSize()), |
| chunk_(chunk_size_), |
| chunk_pos_(0), |
| aborted_(false) { |
| ASSERT(chunk_size_ > 0); |
| } |
| bool aborted() { return aborted_; } |
| void AddCharacter(char c) { |
| ASSERT(c != '\0'); |
| ASSERT(chunk_pos_ < chunk_size_); |
| chunk_[chunk_pos_++] = c; |
| MaybeWriteChunk(); |
| } |
| void AddString(const char* s) { |
| AddSubstring(s, StrLength(s)); |
| } |
| void AddSubstring(const char* s, int n) { |
| if (n <= 0) return; |
| ASSERT(static_cast<size_t>(n) <= strlen(s)); |
| const char* s_end = s + n; |
| while (s < s_end) { |
| int s_chunk_size = Min( |
| chunk_size_ - chunk_pos_, static_cast<int>(s_end - s)); |
| ASSERT(s_chunk_size > 0); |
| OS::MemCopy(chunk_.start() + chunk_pos_, s, s_chunk_size); |
| s += s_chunk_size; |
| chunk_pos_ += s_chunk_size; |
| MaybeWriteChunk(); |
| } |
| } |
| void AddNumber(unsigned n) { AddNumberImpl<unsigned>(n, "%u"); } |
| void Finalize() { |
| if (aborted_) return; |
| ASSERT(chunk_pos_ < chunk_size_); |
| if (chunk_pos_ != 0) { |
| WriteChunk(); |
| } |
| stream_->EndOfStream(); |
| } |
| |
| private: |
| template<typename T> |
| void AddNumberImpl(T n, const char* format) { |
| // Buffer for the longest value plus trailing \0 |
| static const int kMaxNumberSize = |
| MaxDecimalDigitsIn<sizeof(T)>::kUnsigned + 1; |
| if (chunk_size_ - chunk_pos_ >= kMaxNumberSize) { |
| int result = OS::SNPrintF( |
| chunk_.SubVector(chunk_pos_, chunk_size_), format, n); |
| ASSERT(result != -1); |
| chunk_pos_ += result; |
| MaybeWriteChunk(); |
| } else { |
| EmbeddedVector<char, kMaxNumberSize> buffer; |
| int result = OS::SNPrintF(buffer, format, n); |
| USE(result); |
| ASSERT(result != -1); |
| AddString(buffer.start()); |
| } |
| } |
| void MaybeWriteChunk() { |
| ASSERT(chunk_pos_ <= chunk_size_); |
| if (chunk_pos_ == chunk_size_) { |
| WriteChunk(); |
| } |
| } |
| void WriteChunk() { |
| if (aborted_) return; |
| if (stream_->WriteAsciiChunk(chunk_.start(), chunk_pos_) == |
| v8::OutputStream::kAbort) aborted_ = true; |
| chunk_pos_ = 0; |
| } |
| |
| v8::OutputStream* stream_; |
| int chunk_size_; |
| ScopedVector<char> chunk_; |
| int chunk_pos_; |
| bool aborted_; |
| }; |
| |
| |
| // type, name|index, to_node. |
| const int HeapSnapshotJSONSerializer::kEdgeFieldsCount = 3; |
| // type, name, id, self_size, children_index. |
| const int HeapSnapshotJSONSerializer::kNodeFieldsCount = 5; |
| |
| void HeapSnapshotJSONSerializer::Serialize(v8::OutputStream* stream) { |
| ASSERT(writer_ == NULL); |
| writer_ = new OutputStreamWriter(stream); |
| SerializeImpl(); |
| delete writer_; |
| writer_ = NULL; |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeImpl() { |
| ASSERT(0 == snapshot_->root()->index()); |
| writer_->AddCharacter('{'); |
| writer_->AddString("\"snapshot\":{"); |
| SerializeSnapshot(); |
| if (writer_->aborted()) return; |
| writer_->AddString("},\n"); |
| writer_->AddString("\"nodes\":["); |
| SerializeNodes(); |
| if (writer_->aborted()) return; |
| writer_->AddString("],\n"); |
| writer_->AddString("\"edges\":["); |
| SerializeEdges(); |
| if (writer_->aborted()) return; |
| writer_->AddString("],\n"); |
| writer_->AddString("\"strings\":["); |
| SerializeStrings(); |
| if (writer_->aborted()) return; |
| writer_->AddCharacter(']'); |
| writer_->AddCharacter('}'); |
| writer_->Finalize(); |
| } |
| |
| |
| int HeapSnapshotJSONSerializer::GetStringId(const char* s) { |
| HashMap::Entry* cache_entry = strings_.Lookup( |
| const_cast<char*>(s), ObjectHash(s), true); |
| if (cache_entry->value == NULL) { |
| cache_entry->value = reinterpret_cast<void*>(next_string_id_++); |
| } |
| return static_cast<int>(reinterpret_cast<intptr_t>(cache_entry->value)); |
| } |
| |
| |
| static int utoa(unsigned value, const Vector<char>& buffer, int buffer_pos) { |
| int number_of_digits = 0; |
| unsigned t = value; |
| do { |
| ++number_of_digits; |
| } while (t /= 10); |
| |
| buffer_pos += number_of_digits; |
| int result = buffer_pos; |
| do { |
| int last_digit = value % 10; |
| buffer[--buffer_pos] = '0' + last_digit; |
| value /= 10; |
| } while (value); |
| return result; |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeEdge(HeapGraphEdge* edge, |
| bool first_edge) { |
| // The buffer needs space for 3 unsigned ints, 3 commas, \n and \0 |
| static const int kBufferSize = |
| MaxDecimalDigitsIn<sizeof(unsigned)>::kUnsigned * 3 + 3 + 2; // NOLINT |
| EmbeddedVector<char, kBufferSize> buffer; |
| int edge_name_or_index = edge->type() == HeapGraphEdge::kElement |
| || edge->type() == HeapGraphEdge::kHidden |
| || edge->type() == HeapGraphEdge::kWeak |
| ? edge->index() : GetStringId(edge->name()); |
| int buffer_pos = 0; |
| if (!first_edge) { |
| buffer[buffer_pos++] = ','; |
| } |
| buffer_pos = utoa(edge->type(), buffer, buffer_pos); |
| buffer[buffer_pos++] = ','; |
| buffer_pos = utoa(edge_name_or_index, buffer, buffer_pos); |
| buffer[buffer_pos++] = ','; |
| buffer_pos = utoa(entry_index(edge->to()), buffer, buffer_pos); |
| buffer[buffer_pos++] = '\n'; |
| buffer[buffer_pos++] = '\0'; |
| writer_->AddString(buffer.start()); |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeEdges() { |
| List<HeapGraphEdge*>& edges = snapshot_->children(); |
| for (int i = 0; i < edges.length(); ++i) { |
| ASSERT(i == 0 || |
| edges[i - 1]->from()->index() <= edges[i]->from()->index()); |
| SerializeEdge(edges[i], i == 0); |
| if (writer_->aborted()) return; |
| } |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeNode(HeapEntry* entry) { |
| // The buffer needs space for 5 unsigned ints, 5 commas, \n and \0 |
| static const int kBufferSize = |
| 5 * MaxDecimalDigitsIn<sizeof(unsigned)>::kUnsigned // NOLINT |
| + 5 + 1 + 1; |
| EmbeddedVector<char, kBufferSize> buffer; |
| int buffer_pos = 0; |
| if (entry_index(entry) != 0) { |
| buffer[buffer_pos++] = ','; |
| } |
| buffer_pos = utoa(entry->type(), buffer, buffer_pos); |
| buffer[buffer_pos++] = ','; |
| buffer_pos = utoa(GetStringId(entry->name()), buffer, buffer_pos); |
| buffer[buffer_pos++] = ','; |
| buffer_pos = utoa(entry->id(), buffer, buffer_pos); |
| buffer[buffer_pos++] = ','; |
| buffer_pos = utoa(entry->self_size(), buffer, buffer_pos); |
| buffer[buffer_pos++] = ','; |
| buffer_pos = utoa(entry->children_count(), buffer, buffer_pos); |
| buffer[buffer_pos++] = '\n'; |
| buffer[buffer_pos++] = '\0'; |
| writer_->AddString(buffer.start()); |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeNodes() { |
| List<HeapEntry>& entries = snapshot_->entries(); |
| for (int i = 0; i < entries.length(); ++i) { |
| SerializeNode(&entries[i]); |
| if (writer_->aborted()) return; |
| } |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeSnapshot() { |
| writer_->AddString("\"title\":\""); |
| writer_->AddString(snapshot_->title()); |
| writer_->AddString("\""); |
| writer_->AddString(",\"uid\":"); |
| writer_->AddNumber(snapshot_->uid()); |
| writer_->AddString(",\"meta\":"); |
| // The object describing node serialization layout. |
| // We use a set of macros to improve readability. |
| #define JSON_A(s) "[" s "]" |
| #define JSON_O(s) "{" s "}" |
| #define JSON_S(s) "\"" s "\"" |
| writer_->AddString(JSON_O( |
| JSON_S("node_fields") ":" JSON_A( |
| JSON_S("type") "," |
| JSON_S("name") "," |
| JSON_S("id") "," |
| JSON_S("self_size") "," |
| JSON_S("edge_count")) "," |
| JSON_S("node_types") ":" JSON_A( |
| JSON_A( |
| JSON_S("hidden") "," |
| JSON_S("array") "," |
| JSON_S("string") "," |
| JSON_S("object") "," |
| JSON_S("code") "," |
| JSON_S("closure") "," |
| JSON_S("regexp") "," |
| JSON_S("number") "," |
| JSON_S("native") "," |
| JSON_S("synthetic") "," |
| JSON_S("concatenated string") "," |
| JSON_S("sliced string")) "," |
| JSON_S("string") "," |
| JSON_S("number") "," |
| JSON_S("number") "," |
| JSON_S("number") "," |
| JSON_S("number") "," |
| JSON_S("number")) "," |
| JSON_S("edge_fields") ":" JSON_A( |
| JSON_S("type") "," |
| JSON_S("name_or_index") "," |
| JSON_S("to_node")) "," |
| JSON_S("edge_types") ":" JSON_A( |
| JSON_A( |
| JSON_S("context") "," |
| JSON_S("element") "," |
| JSON_S("property") "," |
| JSON_S("internal") "," |
| JSON_S("hidden") "," |
| JSON_S("shortcut") "," |
| JSON_S("weak")) "," |
| JSON_S("string_or_number") "," |
| JSON_S("node")))); |
| #undef JSON_S |
| #undef JSON_O |
| #undef JSON_A |
| writer_->AddString(",\"node_count\":"); |
| writer_->AddNumber(snapshot_->entries().length()); |
| writer_->AddString(",\"edge_count\":"); |
| writer_->AddNumber(snapshot_->edges().length()); |
| } |
| |
| |
| static void WriteUChar(OutputStreamWriter* w, unibrow::uchar u) { |
| static const char hex_chars[] = "0123456789ABCDEF"; |
| w->AddString("\\u"); |
| w->AddCharacter(hex_chars[(u >> 12) & 0xf]); |
| w->AddCharacter(hex_chars[(u >> 8) & 0xf]); |
| w->AddCharacter(hex_chars[(u >> 4) & 0xf]); |
| w->AddCharacter(hex_chars[u & 0xf]); |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeString(const unsigned char* s) { |
| writer_->AddCharacter('\n'); |
| writer_->AddCharacter('\"'); |
| for ( ; *s != '\0'; ++s) { |
| switch (*s) { |
| case '\b': |
| writer_->AddString("\\b"); |
| continue; |
| case '\f': |
| writer_->AddString("\\f"); |
| continue; |
| case '\n': |
| writer_->AddString("\\n"); |
| continue; |
| case '\r': |
| writer_->AddString("\\r"); |
| continue; |
| case '\t': |
| writer_->AddString("\\t"); |
| continue; |
| case '\"': |
| case '\\': |
| writer_->AddCharacter('\\'); |
| writer_->AddCharacter(*s); |
| continue; |
| default: |
| if (*s > 31 && *s < 128) { |
| writer_->AddCharacter(*s); |
| } else if (*s <= 31) { |
| // Special character with no dedicated literal. |
| WriteUChar(writer_, *s); |
| } else { |
| // Convert UTF-8 into \u UTF-16 literal. |
| unsigned length = 1, cursor = 0; |
| for ( ; length <= 4 && *(s + length) != '\0'; ++length) { } |
| unibrow::uchar c = unibrow::Utf8::CalculateValue(s, length, &cursor); |
| if (c != unibrow::Utf8::kBadChar) { |
| WriteUChar(writer_, c); |
| ASSERT(cursor != 0); |
| s += cursor - 1; |
| } else { |
| writer_->AddCharacter('?'); |
| } |
| } |
| } |
| } |
| writer_->AddCharacter('\"'); |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SerializeStrings() { |
| List<HashMap::Entry*> sorted_strings; |
| SortHashMap(&strings_, &sorted_strings); |
| writer_->AddString("\"<dummy>\""); |
| for (int i = 0; i < sorted_strings.length(); ++i) { |
| writer_->AddCharacter(','); |
| SerializeString( |
| reinterpret_cast<const unsigned char*>(sorted_strings[i]->key)); |
| if (writer_->aborted()) return; |
| } |
| } |
| |
| |
| template<typename T> |
| inline static int SortUsingEntryValue(const T* x, const T* y) { |
| uintptr_t x_uint = reinterpret_cast<uintptr_t>((*x)->value); |
| uintptr_t y_uint = reinterpret_cast<uintptr_t>((*y)->value); |
| if (x_uint > y_uint) { |
| return 1; |
| } else if (x_uint == y_uint) { |
| return 0; |
| } else { |
| return -1; |
| } |
| } |
| |
| |
| void HeapSnapshotJSONSerializer::SortHashMap( |
| HashMap* map, List<HashMap::Entry*>* sorted_entries) { |
| for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p)) |
| sorted_entries->Add(p); |
| sorted_entries->Sort(SortUsingEntryValue); |
| } |
| |
| } } // namespace v8::internal |