f3d1888fdb
First step towards replacing PropertyType with two enums: {DATA,ACCESSOR} x {CONST,WRITABLE}.
Review URL: https://codereview.chromium.org/733253004
Cr-Commit-Position: refs/heads/master@{#25417}
3144 lines
107 KiB
C++
3144 lines
107 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/v8.h"
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#include "src/heap-snapshot-generator-inl.h"
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#include "src/allocation-tracker.h"
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#include "src/code-stubs.h"
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#include "src/conversions.h"
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#include "src/debug.h"
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#include "src/heap-profiler.h"
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#include "src/types.h"
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namespace v8 {
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namespace internal {
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HeapGraphEdge::HeapGraphEdge(Type type, const char* name, int from, int to)
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: bit_field_(TypeField::encode(type) | FromIndexField::encode(from)),
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to_index_(to),
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name_(name) {
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DCHECK(type == kContextVariable
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|| type == kProperty
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|| type == kInternal
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|| type == kShortcut
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|| type == kWeak);
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}
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HeapGraphEdge::HeapGraphEdge(Type type, int index, int from, int to)
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: bit_field_(TypeField::encode(type) | FromIndexField::encode(from)),
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to_index_(to),
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index_(index) {
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DCHECK(type == kElement || type == kHidden);
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}
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void HeapGraphEdge::ReplaceToIndexWithEntry(HeapSnapshot* snapshot) {
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to_entry_ = &snapshot->entries()[to_index_];
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}
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const int HeapEntry::kNoEntry = -1;
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HeapEntry::HeapEntry(HeapSnapshot* snapshot,
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Type type,
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const char* name,
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SnapshotObjectId id,
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size_t self_size,
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unsigned trace_node_id)
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: type_(type),
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children_count_(0),
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children_index_(-1),
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self_size_(self_size),
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snapshot_(snapshot),
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name_(name),
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id_(id),
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trace_node_id_(trace_node_id) { }
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void HeapEntry::SetNamedReference(HeapGraphEdge::Type type,
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const char* name,
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HeapEntry* entry) {
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HeapGraphEdge edge(type, name, this->index(), entry->index());
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snapshot_->edges().Add(edge);
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++children_count_;
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}
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void HeapEntry::SetIndexedReference(HeapGraphEdge::Type type,
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int index,
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HeapEntry* entry) {
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HeapGraphEdge edge(type, index, this->index(), entry->index());
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snapshot_->edges().Add(edge);
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++children_count_;
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}
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void HeapEntry::Print(
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const char* prefix, const char* edge_name, int max_depth, int indent) {
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STATIC_ASSERT(sizeof(unsigned) == sizeof(id()));
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base::OS::Print("%6" V8PRIuPTR " @%6u %*c %s%s: ", self_size(), id(), indent,
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' ', prefix, edge_name);
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if (type() != kString) {
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base::OS::Print("%s %.40s\n", TypeAsString(), name_);
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} else {
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base::OS::Print("\"");
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const char* c = name_;
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while (*c && (c - name_) <= 40) {
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if (*c != '\n')
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base::OS::Print("%c", *c);
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else
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base::OS::Print("\\n");
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++c;
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}
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base::OS::Print("\"\n");
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}
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if (--max_depth == 0) return;
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Vector<HeapGraphEdge*> ch = children();
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for (int i = 0; i < ch.length(); ++i) {
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HeapGraphEdge& edge = *ch[i];
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const char* edge_prefix = "";
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EmbeddedVector<char, 64> index;
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const char* edge_name = index.start();
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switch (edge.type()) {
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case HeapGraphEdge::kContextVariable:
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edge_prefix = "#";
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edge_name = edge.name();
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break;
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case HeapGraphEdge::kElement:
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SNPrintF(index, "%d", edge.index());
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break;
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case HeapGraphEdge::kInternal:
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edge_prefix = "$";
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edge_name = edge.name();
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break;
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case HeapGraphEdge::kProperty:
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edge_name = edge.name();
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break;
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case HeapGraphEdge::kHidden:
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edge_prefix = "$";
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SNPrintF(index, "%d", edge.index());
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break;
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case HeapGraphEdge::kShortcut:
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edge_prefix = "^";
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edge_name = edge.name();
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break;
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case HeapGraphEdge::kWeak:
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edge_prefix = "w";
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edge_name = edge.name();
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break;
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default:
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SNPrintF(index, "!!! unknown edge type: %d ", edge.type());
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}
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edge.to()->Print(edge_prefix, edge_name, max_depth, indent + 2);
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}
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}
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const char* HeapEntry::TypeAsString() {
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switch (type()) {
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case kHidden: return "/hidden/";
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case kObject: return "/object/";
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case kClosure: return "/closure/";
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case kString: return "/string/";
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case kCode: return "/code/";
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case kArray: return "/array/";
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case kRegExp: return "/regexp/";
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case kHeapNumber: return "/number/";
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case kNative: return "/native/";
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case kSynthetic: return "/synthetic/";
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case kConsString: return "/concatenated string/";
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case kSlicedString: return "/sliced string/";
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case kSymbol: return "/symbol/";
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default: return "???";
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}
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}
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// It is very important to keep objects that form a heap snapshot
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// as small as possible.
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namespace { // Avoid littering the global namespace.
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template <size_t ptr_size> struct SnapshotSizeConstants;
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template <> struct SnapshotSizeConstants<4> {
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static const int kExpectedHeapGraphEdgeSize = 12;
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static const int kExpectedHeapEntrySize = 28;
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};
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template <> struct SnapshotSizeConstants<8> {
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static const int kExpectedHeapGraphEdgeSize = 24;
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static const int kExpectedHeapEntrySize = 40;
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};
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} // namespace
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HeapSnapshot::HeapSnapshot(HeapProfiler* profiler,
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const char* title,
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unsigned uid)
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: profiler_(profiler),
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title_(title),
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uid_(uid),
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root_index_(HeapEntry::kNoEntry),
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gc_roots_index_(HeapEntry::kNoEntry),
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max_snapshot_js_object_id_(0) {
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STATIC_ASSERT(
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sizeof(HeapGraphEdge) ==
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SnapshotSizeConstants<kPointerSize>::kExpectedHeapGraphEdgeSize);
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STATIC_ASSERT(
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sizeof(HeapEntry) ==
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SnapshotSizeConstants<kPointerSize>::kExpectedHeapEntrySize);
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USE(SnapshotSizeConstants<4>::kExpectedHeapGraphEdgeSize);
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USE(SnapshotSizeConstants<4>::kExpectedHeapEntrySize);
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USE(SnapshotSizeConstants<8>::kExpectedHeapGraphEdgeSize);
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USE(SnapshotSizeConstants<8>::kExpectedHeapEntrySize);
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for (int i = 0; i < VisitorSynchronization::kNumberOfSyncTags; ++i) {
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gc_subroot_indexes_[i] = HeapEntry::kNoEntry;
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}
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}
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void HeapSnapshot::Delete() {
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profiler_->RemoveSnapshot(this);
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delete this;
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}
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void HeapSnapshot::RememberLastJSObjectId() {
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max_snapshot_js_object_id_ = profiler_->heap_object_map()->last_assigned_id();
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}
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void HeapSnapshot::AddSyntheticRootEntries() {
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AddRootEntry();
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AddGcRootsEntry();
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SnapshotObjectId id = HeapObjectsMap::kGcRootsFirstSubrootId;
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for (int tag = 0; tag < VisitorSynchronization::kNumberOfSyncTags; tag++) {
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AddGcSubrootEntry(tag, id);
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id += HeapObjectsMap::kObjectIdStep;
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}
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DCHECK(HeapObjectsMap::kFirstAvailableObjectId == id);
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}
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HeapEntry* HeapSnapshot::AddRootEntry() {
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DCHECK(root_index_ == HeapEntry::kNoEntry);
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DCHECK(entries_.is_empty()); // Root entry must be the first one.
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HeapEntry* entry = AddEntry(HeapEntry::kSynthetic,
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"",
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HeapObjectsMap::kInternalRootObjectId,
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0,
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0);
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root_index_ = entry->index();
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DCHECK(root_index_ == 0);
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return entry;
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}
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HeapEntry* HeapSnapshot::AddGcRootsEntry() {
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DCHECK(gc_roots_index_ == HeapEntry::kNoEntry);
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HeapEntry* entry = AddEntry(HeapEntry::kSynthetic,
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"(GC roots)",
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HeapObjectsMap::kGcRootsObjectId,
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0,
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0);
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gc_roots_index_ = entry->index();
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return entry;
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}
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HeapEntry* HeapSnapshot::AddGcSubrootEntry(int tag, SnapshotObjectId id) {
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DCHECK(gc_subroot_indexes_[tag] == HeapEntry::kNoEntry);
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DCHECK(0 <= tag && tag < VisitorSynchronization::kNumberOfSyncTags);
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HeapEntry* entry = AddEntry(HeapEntry::kSynthetic,
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VisitorSynchronization::kTagNames[tag], id, 0, 0);
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gc_subroot_indexes_[tag] = entry->index();
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return entry;
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}
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HeapEntry* HeapSnapshot::AddEntry(HeapEntry::Type type,
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const char* name,
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SnapshotObjectId id,
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size_t size,
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unsigned trace_node_id) {
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HeapEntry entry(this, type, name, id, size, trace_node_id);
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entries_.Add(entry);
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return &entries_.last();
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}
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void HeapSnapshot::FillChildren() {
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DCHECK(children().is_empty());
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children().Allocate(edges().length());
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int children_index = 0;
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for (int i = 0; i < entries().length(); ++i) {
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HeapEntry* entry = &entries()[i];
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children_index = entry->set_children_index(children_index);
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}
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DCHECK(edges().length() == children_index);
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for (int i = 0; i < edges().length(); ++i) {
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HeapGraphEdge* edge = &edges()[i];
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edge->ReplaceToIndexWithEntry(this);
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edge->from()->add_child(edge);
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}
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}
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class FindEntryById {
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public:
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explicit FindEntryById(SnapshotObjectId id) : id_(id) { }
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int operator()(HeapEntry* const* entry) {
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if ((*entry)->id() == id_) return 0;
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return (*entry)->id() < id_ ? -1 : 1;
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}
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private:
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SnapshotObjectId id_;
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};
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HeapEntry* HeapSnapshot::GetEntryById(SnapshotObjectId id) {
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List<HeapEntry*>* entries_by_id = GetSortedEntriesList();
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// Perform a binary search by id.
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int index = SortedListBSearch(*entries_by_id, FindEntryById(id));
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if (index == -1)
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return NULL;
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return entries_by_id->at(index);
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}
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template<class T>
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static int SortByIds(const T* entry1_ptr,
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const T* entry2_ptr) {
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if ((*entry1_ptr)->id() == (*entry2_ptr)->id()) return 0;
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return (*entry1_ptr)->id() < (*entry2_ptr)->id() ? -1 : 1;
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}
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List<HeapEntry*>* HeapSnapshot::GetSortedEntriesList() {
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if (sorted_entries_.is_empty()) {
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sorted_entries_.Allocate(entries_.length());
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for (int i = 0; i < entries_.length(); ++i) {
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sorted_entries_[i] = &entries_[i];
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}
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sorted_entries_.Sort(SortByIds);
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}
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return &sorted_entries_;
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}
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void HeapSnapshot::Print(int max_depth) {
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root()->Print("", "", max_depth, 0);
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}
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size_t HeapSnapshot::RawSnapshotSize() const {
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return
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sizeof(*this) +
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GetMemoryUsedByList(entries_) +
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GetMemoryUsedByList(edges_) +
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GetMemoryUsedByList(children_) +
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GetMemoryUsedByList(sorted_entries_);
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}
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// We split IDs on evens for embedder objects (see
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// HeapObjectsMap::GenerateId) and odds for native objects.
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const SnapshotObjectId HeapObjectsMap::kInternalRootObjectId = 1;
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const SnapshotObjectId HeapObjectsMap::kGcRootsObjectId =
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HeapObjectsMap::kInternalRootObjectId + HeapObjectsMap::kObjectIdStep;
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const SnapshotObjectId HeapObjectsMap::kGcRootsFirstSubrootId =
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HeapObjectsMap::kGcRootsObjectId + HeapObjectsMap::kObjectIdStep;
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const SnapshotObjectId HeapObjectsMap::kFirstAvailableObjectId =
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HeapObjectsMap::kGcRootsFirstSubrootId +
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VisitorSynchronization::kNumberOfSyncTags * HeapObjectsMap::kObjectIdStep;
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static bool AddressesMatch(void* key1, void* key2) {
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return key1 == key2;
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}
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HeapObjectsMap::HeapObjectsMap(Heap* heap)
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: next_id_(kFirstAvailableObjectId),
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entries_map_(AddressesMatch),
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heap_(heap) {
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// This dummy element solves a problem with entries_map_.
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// When we do lookup in HashMap we see no difference between two cases:
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// it has an entry with NULL as the value or it has created
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// a new entry on the fly with NULL as the default value.
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// With such dummy element we have a guaranty that all entries_map_ entries
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// will have the value field grater than 0.
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// This fact is using in MoveObject method.
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entries_.Add(EntryInfo(0, NULL, 0));
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}
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bool HeapObjectsMap::MoveObject(Address from, Address to, int object_size) {
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DCHECK(to != NULL);
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DCHECK(from != NULL);
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if (from == to) return false;
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void* from_value = entries_map_.Remove(from, ComputePointerHash(from));
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if (from_value == NULL) {
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// It may occur that some untracked object moves to an address X and there
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// is a tracked object at that address. In this case we should remove the
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// entry as we know that the object has died.
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void* to_value = entries_map_.Remove(to, ComputePointerHash(to));
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if (to_value != NULL) {
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int to_entry_info_index =
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static_cast<int>(reinterpret_cast<intptr_t>(to_value));
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entries_.at(to_entry_info_index).addr = NULL;
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}
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} else {
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HashMap::Entry* to_entry = entries_map_.Lookup(to, ComputePointerHash(to),
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true);
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if (to_entry->value != NULL) {
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// We found the existing entry with to address for an old object.
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// Without this operation we will have two EntryInfo's with the same
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// value in addr field. It is bad because later at RemoveDeadEntries
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// one of this entry will be removed with the corresponding entries_map_
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// entry.
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int to_entry_info_index =
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static_cast<int>(reinterpret_cast<intptr_t>(to_entry->value));
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entries_.at(to_entry_info_index).addr = NULL;
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}
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int from_entry_info_index =
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static_cast<int>(reinterpret_cast<intptr_t>(from_value));
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entries_.at(from_entry_info_index).addr = to;
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// Size of an object can change during its life, so to keep information
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// about the object in entries_ consistent, we have to adjust size when the
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// object is migrated.
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if (FLAG_heap_profiler_trace_objects) {
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PrintF("Move object from %p to %p old size %6d new size %6d\n",
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from,
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to,
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entries_.at(from_entry_info_index).size,
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object_size);
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}
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entries_.at(from_entry_info_index).size = object_size;
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to_entry->value = from_value;
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}
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return from_value != NULL;
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}
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void HeapObjectsMap::UpdateObjectSize(Address addr, int size) {
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FindOrAddEntry(addr, size, false);
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}
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SnapshotObjectId HeapObjectsMap::FindEntry(Address addr) {
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HashMap::Entry* entry = entries_map_.Lookup(addr, ComputePointerHash(addr),
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false);
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if (entry == NULL) return 0;
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int entry_index = static_cast<int>(reinterpret_cast<intptr_t>(entry->value));
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EntryInfo& entry_info = entries_.at(entry_index);
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DCHECK(static_cast<uint32_t>(entries_.length()) > entries_map_.occupancy());
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return entry_info.id;
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}
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SnapshotObjectId HeapObjectsMap::FindOrAddEntry(Address addr,
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unsigned int size,
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bool accessed) {
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DCHECK(static_cast<uint32_t>(entries_.length()) > entries_map_.occupancy());
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HashMap::Entry* entry = entries_map_.Lookup(addr, ComputePointerHash(addr),
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true);
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if (entry->value != NULL) {
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int entry_index =
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static_cast<int>(reinterpret_cast<intptr_t>(entry->value));
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EntryInfo& entry_info = entries_.at(entry_index);
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entry_info.accessed = accessed;
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if (FLAG_heap_profiler_trace_objects) {
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PrintF("Update object size : %p with old size %d and new size %d\n",
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addr,
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entry_info.size,
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size);
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}
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entry_info.size = size;
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return entry_info.id;
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}
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entry->value = reinterpret_cast<void*>(entries_.length());
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SnapshotObjectId id = next_id_;
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next_id_ += kObjectIdStep;
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entries_.Add(EntryInfo(id, addr, size, accessed));
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DCHECK(static_cast<uint32_t>(entries_.length()) > entries_map_.occupancy());
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return id;
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}
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void HeapObjectsMap::StopHeapObjectsTracking() {
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time_intervals_.Clear();
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}
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void HeapObjectsMap::UpdateHeapObjectsMap() {
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if (FLAG_heap_profiler_trace_objects) {
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PrintF("Begin HeapObjectsMap::UpdateHeapObjectsMap. map has %d entries.\n",
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entries_map_.occupancy());
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}
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heap_->CollectAllGarbage(Heap::kMakeHeapIterableMask,
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"HeapObjectsMap::UpdateHeapObjectsMap");
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HeapIterator iterator(heap_);
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for (HeapObject* obj = iterator.next();
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obj != NULL;
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obj = iterator.next()) {
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FindOrAddEntry(obj->address(), obj->Size());
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if (FLAG_heap_profiler_trace_objects) {
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PrintF("Update object : %p %6d. Next address is %p\n",
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obj->address(),
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obj->Size(),
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obj->address() + obj->Size());
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}
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}
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RemoveDeadEntries();
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if (FLAG_heap_profiler_trace_objects) {
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|
PrintF("End HeapObjectsMap::UpdateHeapObjectsMap. map has %d entries.\n",
|
|
entries_map_.occupancy());
|
|
}
|
|
}
|
|
|
|
|
|
namespace {
|
|
|
|
|
|
struct HeapObjectInfo {
|
|
HeapObjectInfo(HeapObject* obj, int expected_size)
|
|
: obj(obj),
|
|
expected_size(expected_size) {
|
|
}
|
|
|
|
HeapObject* obj;
|
|
int expected_size;
|
|
|
|
bool IsValid() const { return expected_size == obj->Size(); }
|
|
|
|
void Print() const {
|
|
if (expected_size == 0) {
|
|
PrintF("Untracked object : %p %6d. Next address is %p\n",
|
|
obj->address(),
|
|
obj->Size(),
|
|
obj->address() + obj->Size());
|
|
} else if (obj->Size() != expected_size) {
|
|
PrintF("Wrong size %6d: %p %6d. Next address is %p\n",
|
|
expected_size,
|
|
obj->address(),
|
|
obj->Size(),
|
|
obj->address() + obj->Size());
|
|
} else {
|
|
PrintF("Good object : %p %6d. Next address is %p\n",
|
|
obj->address(),
|
|
expected_size,
|
|
obj->address() + obj->Size());
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
static int comparator(const HeapObjectInfo* a, const HeapObjectInfo* b) {
|
|
if (a->obj < b->obj) return -1;
|
|
if (a->obj > b->obj) return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
} // namespace
|
|
|
|
|
|
int HeapObjectsMap::FindUntrackedObjects() {
|
|
List<HeapObjectInfo> heap_objects(1000);
|
|
|
|
HeapIterator iterator(heap_);
|
|
int untracked = 0;
|
|
for (HeapObject* obj = iterator.next();
|
|
obj != NULL;
|
|
obj = iterator.next()) {
|
|
HashMap::Entry* entry = entries_map_.Lookup(
|
|
obj->address(), ComputePointerHash(obj->address()), false);
|
|
if (entry == NULL) {
|
|
++untracked;
|
|
if (FLAG_heap_profiler_trace_objects) {
|
|
heap_objects.Add(HeapObjectInfo(obj, 0));
|
|
}
|
|
} else {
|
|
int entry_index = static_cast<int>(
|
|
reinterpret_cast<intptr_t>(entry->value));
|
|
EntryInfo& entry_info = entries_.at(entry_index);
|
|
if (FLAG_heap_profiler_trace_objects) {
|
|
heap_objects.Add(HeapObjectInfo(obj,
|
|
static_cast<int>(entry_info.size)));
|
|
if (obj->Size() != static_cast<int>(entry_info.size))
|
|
++untracked;
|
|
} else {
|
|
CHECK_EQ(obj->Size(), static_cast<int>(entry_info.size));
|
|
}
|
|
}
|
|
}
|
|
if (FLAG_heap_profiler_trace_objects) {
|
|
PrintF("\nBegin HeapObjectsMap::FindUntrackedObjects. %d entries in map.\n",
|
|
entries_map_.occupancy());
|
|
heap_objects.Sort(comparator);
|
|
int last_printed_object = -1;
|
|
bool print_next_object = false;
|
|
for (int i = 0; i < heap_objects.length(); ++i) {
|
|
const HeapObjectInfo& object_info = heap_objects[i];
|
|
if (!object_info.IsValid()) {
|
|
++untracked;
|
|
if (last_printed_object != i - 1) {
|
|
if (i > 0) {
|
|
PrintF("%d objects were skipped\n", i - 1 - last_printed_object);
|
|
heap_objects[i - 1].Print();
|
|
}
|
|
}
|
|
object_info.Print();
|
|
last_printed_object = i;
|
|
print_next_object = true;
|
|
} else if (print_next_object) {
|
|
object_info.Print();
|
|
print_next_object = false;
|
|
last_printed_object = i;
|
|
}
|
|
}
|
|
if (last_printed_object < heap_objects.length() - 1) {
|
|
PrintF("Last %d objects were skipped\n",
|
|
heap_objects.length() - 1 - last_printed_object);
|
|
}
|
|
PrintF("End HeapObjectsMap::FindUntrackedObjects. %d entries in map.\n\n",
|
|
entries_map_.occupancy());
|
|
}
|
|
return untracked;
|
|
}
|
|
|
|
|
|
SnapshotObjectId HeapObjectsMap::PushHeapObjectsStats(OutputStream* stream) {
|
|
UpdateHeapObjectsMap();
|
|
time_intervals_.Add(TimeInterval(next_id_));
|
|
int prefered_chunk_size = stream->GetChunkSize();
|
|
List<v8::HeapStatsUpdate> stats_buffer;
|
|
DCHECK(!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();
|
|
}
|
|
}
|
|
}
|
|
DCHECK(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() {
|
|
DCHECK(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);
|
|
DCHECK(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);
|
|
DCHECK(static_cast<uint32_t>(entries_.length()) - 1 ==
|
|
entries_map_.occupancy());
|
|
}
|
|
|
|
|
|
SnapshotObjectId HeapObjectsMap::GenerateId(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_);
|
|
}
|
|
|
|
|
|
HeapEntriesMap::HeapEntriesMap()
|
|
: entries_(HashMap::PointersMatch) {
|
|
}
|
|
|
|
|
|
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);
|
|
DCHECK(cache_entry->value == NULL);
|
|
cache_entry->value = reinterpret_cast<void*>(static_cast<intptr_t>(entry));
|
|
}
|
|
|
|
|
|
HeapObjectsSet::HeapObjectsSet()
|
|
: entries_(HashMap::PointersMatch) {
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
V8HeapExplorer::V8HeapExplorer(
|
|
HeapSnapshot* snapshot,
|
|
SnapshottingProgressReportingInterface* progress,
|
|
v8::HeapProfiler::ObjectNameResolver* resolver)
|
|
: heap_(snapshot->profiler()->heap_object_map()->heap()),
|
|
snapshot_(snapshot),
|
|
names_(snapshot_->profiler()->names()),
|
|
heap_object_map_(snapshot_->profiler()->heap_object_map()),
|
|
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->IsJSFunction()) {
|
|
JSFunction* func = JSFunction::cast(object);
|
|
SharedFunctionInfo* shared = func->shared();
|
|
const char* name = shared->bound() ? "native_bind" :
|
|
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,
|
|
names_->GetName(re->Pattern()));
|
|
} else if (object->IsJSObject()) {
|
|
const char* name = names_->GetName(
|
|
GetConstructorName(JSObject::cast(object)));
|
|
if (object->IsJSGlobalObject()) {
|
|
const char* tag = objects_tags_.GetTag(object);
|
|
if (tag != NULL) {
|
|
name = 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,
|
|
names_->GetName(String::cast(object)));
|
|
} else if (object->IsSymbol()) {
|
|
return AddEntry(object, HeapEntry::kSymbol, "symbol");
|
|
} 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,
|
|
names_->GetName(name));
|
|
} else if (object->IsScript()) {
|
|
Object* name = Script::cast(object)->name();
|
|
return AddEntry(object,
|
|
HeapEntry::kCode,
|
|
name->IsString()
|
|
? 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) {
|
|
return AddEntry(object->address(), type, name, object->Size());
|
|
}
|
|
|
|
|
|
HeapEntry* V8HeapExplorer::AddEntry(Address address,
|
|
HeapEntry::Type type,
|
|
const char* name,
|
|
size_t size) {
|
|
SnapshotObjectId object_id = heap_object_map_->FindOrAddEntry(
|
|
address, static_cast<unsigned int>(size));
|
|
unsigned trace_node_id = 0;
|
|
if (AllocationTracker* allocation_tracker =
|
|
snapshot_->profiler()->allocation_tracker()) {
|
|
trace_node_id =
|
|
allocation_tracker->address_to_trace()->GetTraceNodeId(address);
|
|
}
|
|
return snapshot_->AddEntry(type, name, object_id, size, trace_node_id);
|
|
}
|
|
|
|
|
|
class SnapshotFiller {
|
|
public:
|
|
explicit SnapshotFiller(HeapSnapshot* snapshot, HeapEntriesMap* entries)
|
|
: snapshot_(snapshot),
|
|
names_(snapshot->profiler()->names()),
|
|
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,
|
|
names_->GetName(index),
|
|
child_entry);
|
|
}
|
|
|
|
private:
|
|
HeapSnapshot* snapshot_;
|
|
StringsStorage* names_;
|
|
HeapEntriesMap* entries_;
|
|
};
|
|
|
|
|
|
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_->TagCodeObject(code);
|
|
}
|
|
void VisitPointers(Object** start, Object** end) {
|
|
for (Object** p = start; p < end; p++) {
|
|
++next_index_;
|
|
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;
|
|
DCHECK(Memory::Object_at(field)->IsHeapObject());
|
|
intptr_t p = reinterpret_cast<intptr_t>(Memory::Object_at(field));
|
|
DCHECK(!IsMarked(p));
|
|
intptr_t p_tagged = p | kTag;
|
|
Memory::Object_at(field) = reinterpret_cast<Object*>(p_tagged);
|
|
}
|
|
|
|
private:
|
|
bool CheckVisitedAndUnmark(Object** field) {
|
|
intptr_t p = reinterpret_cast<intptr_t>(*field);
|
|
if (IsMarked(p)) {
|
|
intptr_t p_untagged = (p & ~kTaggingMask) | kHeapObjectTag;
|
|
*field = reinterpret_cast<Object*>(p_untagged);
|
|
DCHECK((*field)->IsHeapObject());
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static const intptr_t kTaggingMask = 3;
|
|
static const intptr_t kTag = 3;
|
|
|
|
static bool IsMarked(intptr_t p) { return (p & kTaggingMask) == kTag; }
|
|
|
|
V8HeapExplorer* generator_;
|
|
HeapObject* parent_obj_;
|
|
int parent_;
|
|
int next_index_;
|
|
};
|
|
|
|
|
|
bool V8HeapExplorer::ExtractReferencesPass1(int entry, HeapObject* obj) {
|
|
if (obj->IsFixedArray()) return false; // FixedArrays are processed on pass 2
|
|
|
|
if (obj->IsJSGlobalProxy()) {
|
|
ExtractJSGlobalProxyReferences(entry, JSGlobalProxy::cast(obj));
|
|
} else if (obj->IsJSArrayBuffer()) {
|
|
ExtractJSArrayBufferReferences(entry, JSArrayBuffer::cast(obj));
|
|
} else if (obj->IsJSObject()) {
|
|
if (obj->IsJSWeakSet()) {
|
|
ExtractJSWeakCollectionReferences(entry, JSWeakSet::cast(obj));
|
|
} else if (obj->IsJSWeakMap()) {
|
|
ExtractJSWeakCollectionReferences(entry, JSWeakMap::cast(obj));
|
|
} else if (obj->IsJSSet()) {
|
|
ExtractJSCollectionReferences(entry, JSSet::cast(obj));
|
|
} else if (obj->IsJSMap()) {
|
|
ExtractJSCollectionReferences(entry, JSMap::cast(obj));
|
|
}
|
|
ExtractJSObjectReferences(entry, JSObject::cast(obj));
|
|
} else if (obj->IsString()) {
|
|
ExtractStringReferences(entry, String::cast(obj));
|
|
} else if (obj->IsSymbol()) {
|
|
ExtractSymbolReferences(entry, Symbol::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->IsAccessorInfo()) {
|
|
ExtractAccessorInfoReferences(entry, AccessorInfo::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->IsBox()) {
|
|
ExtractBoxReferences(entry, Box::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));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool V8HeapExplorer::ExtractReferencesPass2(int entry, HeapObject* obj) {
|
|
if (!obj->IsFixedArray()) return false;
|
|
|
|
if (obj->IsContext()) {
|
|
ExtractContextReferences(entry, Context::cast(obj));
|
|
} else {
|
|
ExtractFixedArrayReferences(entry, FixedArray::cast(obj));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
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);
|
|
PrototypeIterator iter(heap_->isolate(), js_obj);
|
|
SetPropertyReference(obj, entry, heap_->proto_string(), iter.GetCurrent());
|
|
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);
|
|
SetWeakReference(js_fun, entry,
|
|
"next_function_link", js_fun->next_function_link(),
|
|
JSFunction::kNextFunctionLinkOffset);
|
|
STATIC_ASSERT(JSFunction::kNextFunctionLinkOffset
|
|
== JSFunction::kNonWeakFieldsEndOffset);
|
|
STATIC_ASSERT(JSFunction::kNextFunctionLinkOffset + kPointerSize
|
|
== JSFunction::kSize);
|
|
} 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_proxy", global_obj->global_proxy(),
|
|
GlobalObject::kGlobalProxyOffset);
|
|
STATIC_ASSERT(GlobalObject::kHeaderSize - JSObject::kHeaderSize ==
|
|
3 * kPointerSize);
|
|
} else if (obj->IsJSArrayBufferView()) {
|
|
JSArrayBufferView* view = JSArrayBufferView::cast(obj);
|
|
SetInternalReference(view, entry, "buffer", view->buffer(),
|
|
JSArrayBufferView::kBufferOffset);
|
|
SetWeakReference(view, entry, "weak_next", view->weak_next(),
|
|
JSArrayBufferView::kWeakNextOffset);
|
|
}
|
|
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::ExtractSymbolReferences(int entry, Symbol* symbol) {
|
|
SetInternalReference(symbol, entry,
|
|
"name", symbol->name(),
|
|
Symbol::kNameOffset);
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::ExtractJSCollectionReferences(int entry,
|
|
JSCollection* collection) {
|
|
SetInternalReference(collection, entry, "table", collection->table(),
|
|
JSCollection::kTableOffset);
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::ExtractJSWeakCollectionReferences(
|
|
int entry, JSWeakCollection* collection) {
|
|
MarkAsWeakContainer(collection->table());
|
|
SetInternalReference(collection, entry,
|
|
"table", collection->table(),
|
|
JSWeakCollection::kTableOffset);
|
|
}
|
|
|
|
|
|
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) \
|
|
if (Context::index < Context::FIRST_WEAK_SLOT || \
|
|
Context::index == Context::MAP_CACHE_INDEX) { \
|
|
SetInternalReference(context, entry, #name, context->get(Context::index), \
|
|
FixedArray::OffsetOfElementAt(Context::index)); \
|
|
} else { \
|
|
SetWeakReference(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);
|
|
EXTRACT_CONTEXT_FIELD(OPTIMIZED_FUNCTIONS_LIST, unused,
|
|
optimized_functions_list);
|
|
EXTRACT_CONTEXT_FIELD(OPTIMIZED_CODE_LIST, unused, optimized_code_list);
|
|
EXTRACT_CONTEXT_FIELD(DEOPTIMIZED_CODE_LIST, unused, deoptimized_code_list);
|
|
EXTRACT_CONTEXT_FIELD(NEXT_CONTEXT_LINK, unused, next_context_link);
|
|
#undef EXTRACT_CONTEXT_FIELD
|
|
STATIC_ASSERT(Context::OPTIMIZED_FUNCTIONS_LIST ==
|
|
Context::FIRST_WEAK_SLOT);
|
|
STATIC_ASSERT(Context::NEXT_CONTEXT_LINK + 1 ==
|
|
Context::NATIVE_CONTEXT_SLOTS);
|
|
STATIC_ASSERT(Context::FIRST_WEAK_SLOT + 4 ==
|
|
Context::NATIVE_CONTEXT_SLOTS);
|
|
}
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
if (FLAG_collect_maps && map->CanTransition()) {
|
|
if (!transitions->IsSimpleTransition()) {
|
|
if (transitions->HasPrototypeTransitions()) {
|
|
FixedArray* prototype_transitions =
|
|
transitions->GetPrototypeTransitions();
|
|
MarkAsWeakContainer(prototype_transitions);
|
|
TagObject(prototype_transitions, "(prototype transitions");
|
|
SetInternalReference(transitions, transitions_entry,
|
|
"prototype_transitions", prototype_transitions);
|
|
}
|
|
// TODO(alph): transitions keys are strong links.
|
|
MarkAsWeakContainer(transitions);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
MarkAsWeakContainer(map->code_cache());
|
|
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)");
|
|
MarkAsWeakContainer(map->dependent_code());
|
|
SetInternalReference(map, entry,
|
|
"dependent_code", map->dependent_code(),
|
|
Map::kDependentCodeOffset);
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::ExtractSharedFunctionInfoReferences(
|
|
int entry, SharedFunctionInfo* shared) {
|
|
HeapObject* obj = shared;
|
|
String* shared_name = shared->DebugName();
|
|
const char* name = NULL;
|
|
if (shared_name != *heap_->isolate()->factory()->empty_string()) {
|
|
name = names_->GetName(shared_name);
|
|
TagObject(shared->code(), names_->GetFormatted("(code for %s)", name));
|
|
} else {
|
|
TagObject(shared->code(), names_->GetFormatted("(%s code)",
|
|
Code::Kind2String(shared->code()->kind())));
|
|
}
|
|
|
|
SetInternalReference(obj, entry,
|
|
"name", shared->name(),
|
|
SharedFunctionInfo::kNameOffset);
|
|
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);
|
|
const char* construct_stub_name = name ?
|
|
names_->GetFormatted("(construct stub code for %s)", name) :
|
|
"(construct stub code)";
|
|
TagObject(shared->construct_stub(), construct_stub_name);
|
|
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);
|
|
SetInternalReference(obj, entry,
|
|
"optimized_code_map", shared->optimized_code_map(),
|
|
SharedFunctionInfo::kOptimizedCodeMapOffset);
|
|
SetInternalReference(obj, entry,
|
|
"feedback_vector", shared->feedback_vector(),
|
|
SharedFunctionInfo::kFeedbackVectorOffset);
|
|
}
|
|
|
|
|
|
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,
|
|
"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::ExtractAccessorInfoReferences(
|
|
int entry, AccessorInfo* accessor_info) {
|
|
SetInternalReference(accessor_info, entry, "name", accessor_info->name(),
|
|
AccessorInfo::kNameOffset);
|
|
SetInternalReference(accessor_info, entry, "expected_receiver_type",
|
|
accessor_info->expected_receiver_type(),
|
|
AccessorInfo::kExpectedReceiverTypeOffset);
|
|
if (accessor_info->IsDeclaredAccessorInfo()) {
|
|
DeclaredAccessorInfo* declared_accessor_info =
|
|
DeclaredAccessorInfo::cast(accessor_info);
|
|
SetInternalReference(declared_accessor_info, entry, "descriptor",
|
|
declared_accessor_info->descriptor(),
|
|
DeclaredAccessorInfo::kDescriptorOffset);
|
|
} else if (accessor_info->IsExecutableAccessorInfo()) {
|
|
ExecutableAccessorInfo* executable_accessor_info =
|
|
ExecutableAccessorInfo::cast(accessor_info);
|
|
SetInternalReference(executable_accessor_info, entry, "getter",
|
|
executable_accessor_info->getter(),
|
|
ExecutableAccessorInfo::kGetterOffset);
|
|
SetInternalReference(executable_accessor_info, entry, "setter",
|
|
executable_accessor_info->setter(),
|
|
ExecutableAccessorInfo::kSetterOffset);
|
|
SetInternalReference(executable_accessor_info, entry, "data",
|
|
executable_accessor_info->data(),
|
|
ExecutableAccessorInfo::kDataOffset);
|
|
}
|
|
}
|
|
|
|
|
|
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::TagBuiltinCodeObject(Code* code, const char* name) {
|
|
TagObject(code, names_->GetFormatted("(%s builtin)", name));
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::TagCodeObject(Code* code) {
|
|
if (code->kind() == Code::STUB) {
|
|
TagObject(code, names_->GetFormatted(
|
|
"(%s code)", CodeStub::MajorName(
|
|
CodeStub::GetMajorKey(code), true)));
|
|
}
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::ExtractCodeReferences(int entry, Code* code) {
|
|
TagCodeObject(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);
|
|
SetInternalReference(code, entry,
|
|
"constant_pool", code->constant_pool(),
|
|
Code::kConstantPoolOffset);
|
|
if (code->kind() == Code::OPTIMIZED_FUNCTION) {
|
|
SetWeakReference(code, entry,
|
|
"next_code_link", code->next_code_link(),
|
|
Code::kNextCodeLinkOffset);
|
|
}
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::ExtractBoxReferences(int entry, Box* box) {
|
|
SetInternalReference(box, entry, "value", box->value(), Box::kValueOffset);
|
|
}
|
|
|
|
|
|
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);
|
|
MarkAsWeakContainer(cell->dependent_code());
|
|
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);
|
|
SetInternalReference(site, entry, "nested_site", site->nested_site(),
|
|
AllocationSite::kNestedSiteOffset);
|
|
MarkAsWeakContainer(site->dependent_code());
|
|
SetInternalReference(site, entry, "dependent_code", site->dependent_code(),
|
|
AllocationSite::kDependentCodeOffset);
|
|
// Do not visit weak_next as it is not visited by the StaticVisitor,
|
|
// and we're not very interested in weak_next field here.
|
|
STATIC_ASSERT(AllocationSite::kWeakNextOffset >=
|
|
AllocationSite::BodyDescriptor::kEndOffset);
|
|
}
|
|
|
|
|
|
class JSArrayBufferDataEntryAllocator : public HeapEntriesAllocator {
|
|
public:
|
|
JSArrayBufferDataEntryAllocator(size_t size, V8HeapExplorer* explorer)
|
|
: size_(size)
|
|
, explorer_(explorer) {
|
|
}
|
|
virtual HeapEntry* AllocateEntry(HeapThing ptr) {
|
|
return explorer_->AddEntry(
|
|
static_cast<Address>(ptr),
|
|
HeapEntry::kNative, "system / JSArrayBufferData", size_);
|
|
}
|
|
private:
|
|
size_t size_;
|
|
V8HeapExplorer* explorer_;
|
|
};
|
|
|
|
|
|
void V8HeapExplorer::ExtractJSArrayBufferReferences(
|
|
int entry, JSArrayBuffer* buffer) {
|
|
SetWeakReference(buffer, entry, "weak_next", buffer->weak_next(),
|
|
JSArrayBuffer::kWeakNextOffset);
|
|
SetWeakReference(buffer, entry,
|
|
"weak_first_view", buffer->weak_first_view(),
|
|
JSArrayBuffer::kWeakFirstViewOffset);
|
|
// Setup a reference to a native memory backing_store object.
|
|
if (!buffer->backing_store())
|
|
return;
|
|
size_t data_size = NumberToSize(heap_->isolate(), buffer->byte_length());
|
|
JSArrayBufferDataEntryAllocator allocator(data_size, this);
|
|
HeapEntry* data_entry =
|
|
filler_->FindOrAddEntry(buffer->backing_store(), &allocator);
|
|
filler_->SetNamedReference(HeapGraphEdge::kInternal,
|
|
entry, "backing_store", data_entry);
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::ExtractFixedArrayReferences(int entry, FixedArray* array) {
|
|
bool is_weak = weak_containers_.Contains(array);
|
|
for (int i = 0, l = array->length(); i < l; ++i) {
|
|
if (is_weak) {
|
|
SetWeakReference(array, entry,
|
|
i, array->get(i), array->OffsetOfElementAt(i));
|
|
} else {
|
|
SetInternalReference(array, entry,
|
|
i, array->get(i), array->OffsetOfElementAt(i));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
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 = 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: {
|
|
Representation r = descs->GetDetails(i).representation();
|
|
if (r.IsSmi() || r.IsDouble()) break;
|
|
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 {
|
|
FieldIndex field_index =
|
|
FieldIndex::ForDescriptor(js_obj->map(), i);
|
|
Object* value = js_obj->RawFastPropertyAt(field_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;
|
|
}
|
|
}
|
|
} 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, Name::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, Name::cast(key), getter, "get %s");
|
|
}
|
|
Object* setter = accessors->setter();
|
|
if (!setter->IsOddball()) {
|
|
SetPropertyReference(js_obj, entry, Name::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)) {
|
|
DCHECK(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()) {
|
|
// TODO(verwaest): Try to get object.constructor.name in this case.
|
|
// This requires handlification of the V8HeapExplorer.
|
|
}
|
|
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:
|
|
explicit RootsReferencesExtractor(Heap* heap)
|
|
: collecting_all_references_(false),
|
|
previous_reference_count_(0),
|
|
heap_(heap) {
|
|
}
|
|
|
|
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) {
|
|
DCHECK(strong_references_.length() <= all_references_.length());
|
|
Builtins* builtins = heap_->isolate()->builtins();
|
|
int strong_index = 0, all_index = 0, tags_index = 0, builtin_index = 0;
|
|
while (all_index < all_references_.length()) {
|
|
bool is_strong = strong_index < strong_references_.length()
|
|
&& strong_references_[strong_index] == all_references_[all_index];
|
|
explorer->SetGcSubrootReference(reference_tags_[tags_index].tag,
|
|
!is_strong,
|
|
all_references_[all_index]);
|
|
if (reference_tags_[tags_index].tag ==
|
|
VisitorSynchronization::kBuiltins) {
|
|
DCHECK(all_references_[all_index]->IsCode());
|
|
explorer->TagBuiltinCodeObject(
|
|
Code::cast(all_references_[all_index]),
|
|
builtins->name(builtin_index++));
|
|
}
|
|
++all_index;
|
|
if (is_strong) ++strong_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_;
|
|
Heap* heap_;
|
|
};
|
|
|
|
|
|
bool V8HeapExplorer::IterateAndExtractReferences(
|
|
SnapshotFiller* filler) {
|
|
filler_ = filler;
|
|
|
|
// Create references to the synthetic roots.
|
|
SetRootGcRootsReference();
|
|
for (int tag = 0; tag < VisitorSynchronization::kNumberOfSyncTags; tag++) {
|
|
SetGcRootsReference(static_cast<VisitorSynchronization::SyncTag>(tag));
|
|
}
|
|
|
|
// Make sure builtin code objects get their builtin tags
|
|
// first. Otherwise a particular JSFunction object could set
|
|
// its custom name to a generic builtin.
|
|
RootsReferencesExtractor extractor(heap_);
|
|
heap_->IterateRoots(&extractor, VISIT_ONLY_STRONG);
|
|
extractor.SetCollectingAllReferences();
|
|
heap_->IterateRoots(&extractor, VISIT_ALL);
|
|
extractor.FillReferences(this);
|
|
|
|
// We have to do two passes as sometimes FixedArrays are used
|
|
// to weakly hold their items, and it's impossible to distinguish
|
|
// between these cases without processing the array owner first.
|
|
bool interrupted =
|
|
IterateAndExtractSinglePass<&V8HeapExplorer::ExtractReferencesPass1>() ||
|
|
IterateAndExtractSinglePass<&V8HeapExplorer::ExtractReferencesPass2>();
|
|
|
|
if (interrupted) {
|
|
filler_ = NULL;
|
|
return false;
|
|
}
|
|
|
|
filler_ = NULL;
|
|
return progress_->ProgressReport(true);
|
|
}
|
|
|
|
|
|
template<V8HeapExplorer::ExtractReferencesMethod extractor>
|
|
bool V8HeapExplorer::IterateAndExtractSinglePass() {
|
|
// Now iterate the whole heap.
|
|
bool interrupted = false;
|
|
HeapIterator iterator(heap_, HeapIterator::kFilterUnreachable);
|
|
// Heap iteration with filtering must be finished in any case.
|
|
for (HeapObject* obj = iterator.next();
|
|
obj != NULL;
|
|
obj = iterator.next(), progress_->ProgressStep()) {
|
|
if (interrupted) continue;
|
|
|
|
HeapEntry* heap_entry = GetEntry(obj);
|
|
int entry = heap_entry->index();
|
|
if ((this->*extractor)(entry, 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);
|
|
}
|
|
|
|
if (!progress_->ProgressReport(false)) interrupted = true;
|
|
}
|
|
return interrupted;
|
|
}
|
|
|
|
|
|
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) {
|
|
DCHECK(parent_entry == GetEntry(parent_obj)->index());
|
|
HeapEntry* child_entry = GetEntry(child_obj);
|
|
if (child_entry != NULL) {
|
|
filler_->SetNamedReference(HeapGraphEdge::kContextVariable,
|
|
parent_entry,
|
|
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) {
|
|
DCHECK(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) {
|
|
DCHECK(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) {
|
|
DCHECK(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) {
|
|
DCHECK(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,
|
|
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) {
|
|
DCHECK(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,
|
|
const char* reference_name,
|
|
Object* child_obj,
|
|
int field_offset) {
|
|
DCHECK(parent_entry == GetEntry(parent_obj)->index());
|
|
HeapEntry* child_entry = GetEntry(child_obj);
|
|
if (child_entry == NULL) return;
|
|
if (IsEssentialObject(child_obj)) {
|
|
filler_->SetNamedReference(HeapGraphEdge::kWeak,
|
|
parent_entry,
|
|
reference_name,
|
|
child_entry);
|
|
}
|
|
IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset);
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::SetWeakReference(HeapObject* parent_obj,
|
|
int parent_entry,
|
|
int index,
|
|
Object* child_obj,
|
|
int field_offset) {
|
|
DCHECK(parent_entry == GetEntry(parent_obj)->index());
|
|
HeapEntry* child_entry = GetEntry(child_obj);
|
|
if (child_entry == NULL) return;
|
|
if (IsEssentialObject(child_obj)) {
|
|
filler_->SetNamedReference(HeapGraphEdge::kWeak,
|
|
parent_entry,
|
|
names_->GetFormatted("%d", 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) {
|
|
DCHECK(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()
|
|
? names_->GetFormatted(
|
|
name_format_string,
|
|
String::cast(reference_name)->ToCString(
|
|
DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL).get()) :
|
|
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);
|
|
DCHECK(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 {
|
|
if (is_weak) {
|
|
filler_->SetNamedAutoIndexReference(
|
|
HeapGraphEdge::kWeak,
|
|
snapshot_->gc_subroot(tag)->index(),
|
|
child_entry);
|
|
} else {
|
|
filler_->SetIndexedAutoIndexReference(
|
|
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;
|
|
is_debug_object = heap_->isolate()->debug()->IsDebugGlobal(global);
|
|
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
|
|
#define SYMBOL_NAME(name) NAME_ENTRY(name)
|
|
PRIVATE_SYMBOL_LIST(SYMBOL_NAME)
|
|
#undef SYMBOL_NAME
|
|
#define SYMBOL_NAME(name, varname, description) NAME_ENTRY(name)
|
|
PUBLIC_SYMBOL_LIST(SYMBOL_NAME)
|
|
#undef SYMBOL_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);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void V8HeapExplorer::MarkAsWeakContainer(Object* object) {
|
|
if (IsEssentialObject(object) && object->IsFixedArray()) {
|
|
weak_containers_.Insert(object);
|
|
}
|
|
}
|
|
|
|
|
|
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),
|
|
names_(snapshot_->profiler()->names()),
|
|
heap_object_map_(snapshot_->profiler()->heap_object_map()),
|
|
entries_type_(entries_type) {
|
|
}
|
|
virtual HeapEntry* AllocateEntry(HeapThing ptr);
|
|
private:
|
|
HeapSnapshot* snapshot_;
|
|
StringsStorage* names_;
|
|
HeapObjectsMap* heap_object_map_;
|
|
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
|
|
? names_->GetFormatted(
|
|
"%s / %" V8_PTR_PREFIX "d entries", info->GetLabel(), elements)
|
|
: names_->GetCopy(info->GetLabel());
|
|
return snapshot_->AddEntry(
|
|
entries_type_,
|
|
name,
|
|
heap_object_map_->GenerateId(info),
|
|
size != -1 ? static_cast<int>(size) : 0,
|
|
0);
|
|
}
|
|
|
|
|
|
NativeObjectsExplorer::NativeObjectsExplorer(
|
|
HeapSnapshot* snapshot,
|
|
SnapshottingProgressReportingInterface* progress)
|
|
: isolate_(snapshot->profiler()->heap_object_map()->heap()->isolate()),
|
|
snapshot_(snapshot),
|
|
names_(snapshot_->profiler()->names()),
|
|
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, kNoGCCallbackFlags);
|
|
// 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();
|
|
DCHECK(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(
|
|
SnapshotFiller* 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 = 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_);
|
|
DCHECK(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);
|
|
DCHECK(wrapper_entry != NULL);
|
|
HeapEntry* info_entry =
|
|
filler_->FindOrAddEntry(info, native_entries_allocator_);
|
|
DCHECK(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_);
|
|
DCHECK(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));
|
|
}
|
|
|
|
|
|
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_;
|
|
debug_heap->Verify();
|
|
#endif
|
|
|
|
SetProgressTotal(2); // 2 passes.
|
|
|
|
#ifdef VERIFY_HEAP
|
|
debug_heap->Verify();
|
|
#endif
|
|
|
|
snapshot_->AddSyntheticRootEntries();
|
|
|
|
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_);
|
|
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) {
|
|
DCHECK(chunk_size_ > 0);
|
|
}
|
|
bool aborted() { return aborted_; }
|
|
void AddCharacter(char c) {
|
|
DCHECK(c != '\0');
|
|
DCHECK(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;
|
|
DCHECK(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));
|
|
DCHECK(s_chunk_size > 0);
|
|
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;
|
|
DCHECK(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 = SNPrintF(
|
|
chunk_.SubVector(chunk_pos_, chunk_size_), format, n);
|
|
DCHECK(result != -1);
|
|
chunk_pos_ += result;
|
|
MaybeWriteChunk();
|
|
} else {
|
|
EmbeddedVector<char, kMaxNumberSize> buffer;
|
|
int result = SNPrintF(buffer, format, n);
|
|
USE(result);
|
|
DCHECK(result != -1);
|
|
AddString(buffer.start());
|
|
}
|
|
}
|
|
void MaybeWriteChunk() {
|
|
DCHECK(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, edge_count, trace_node_id.
|
|
const int HeapSnapshotJSONSerializer::kNodeFieldsCount = 6;
|
|
|
|
void HeapSnapshotJSONSerializer::Serialize(v8::OutputStream* stream) {
|
|
if (AllocationTracker* allocation_tracker =
|
|
snapshot_->profiler()->allocation_tracker()) {
|
|
allocation_tracker->PrepareForSerialization();
|
|
}
|
|
DCHECK(writer_ == NULL);
|
|
writer_ = new OutputStreamWriter(stream);
|
|
SerializeImpl();
|
|
delete writer_;
|
|
writer_ = NULL;
|
|
}
|
|
|
|
|
|
void HeapSnapshotJSONSerializer::SerializeImpl() {
|
|
DCHECK(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("\"trace_function_infos\":[");
|
|
SerializeTraceNodeInfos();
|
|
if (writer_->aborted()) return;
|
|
writer_->AddString("],\n");
|
|
writer_->AddString("\"trace_tree\":[");
|
|
SerializeTraceTree();
|
|
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), StringHash(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));
|
|
}
|
|
|
|
|
|
namespace {
|
|
|
|
template<size_t size> struct ToUnsigned;
|
|
|
|
template<> struct ToUnsigned<4> {
|
|
typedef uint32_t Type;
|
|
};
|
|
|
|
template<> struct ToUnsigned<8> {
|
|
typedef uint64_t Type;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
|
|
template<typename T>
|
|
static int utoa_impl(T value, const Vector<char>& buffer, int buffer_pos) {
|
|
STATIC_ASSERT(static_cast<T>(-1) > 0); // Check that T is unsigned
|
|
int number_of_digits = 0;
|
|
T t = value;
|
|
do {
|
|
++number_of_digits;
|
|
} while (t /= 10);
|
|
|
|
buffer_pos += number_of_digits;
|
|
int result = buffer_pos;
|
|
do {
|
|
int last_digit = static_cast<int>(value % 10);
|
|
buffer[--buffer_pos] = '0' + last_digit;
|
|
value /= 10;
|
|
} while (value);
|
|
return result;
|
|
}
|
|
|
|
|
|
template<typename T>
|
|
static int utoa(T value, const Vector<char>& buffer, int buffer_pos) {
|
|
typename ToUnsigned<sizeof(value)>::Type unsigned_value = value;
|
|
STATIC_ASSERT(sizeof(value) == sizeof(unsigned_value));
|
|
return utoa_impl(unsigned_value, buffer, buffer_pos);
|
|
}
|
|
|
|
|
|
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->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) {
|
|
DCHECK(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 4 unsigned ints, 1 size_t, 5 commas, \n and \0
|
|
static const int kBufferSize =
|
|
5 * MaxDecimalDigitsIn<sizeof(unsigned)>::kUnsigned // NOLINT
|
|
+ MaxDecimalDigitsIn<sizeof(size_t)>::kUnsigned // NOLINT
|
|
+ 6 + 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++] = ',';
|
|
buffer_pos = utoa(entry->trace_node_id(), 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("trace_node_id")) ","
|
|
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")) ","
|
|
JSON_S("trace_function_info_fields") ":" JSON_A(
|
|
JSON_S("function_id") ","
|
|
JSON_S("name") ","
|
|
JSON_S("script_name") ","
|
|
JSON_S("script_id") ","
|
|
JSON_S("line") ","
|
|
JSON_S("column")) ","
|
|
JSON_S("trace_node_fields") ":" JSON_A(
|
|
JSON_S("id") ","
|
|
JSON_S("function_info_index") ","
|
|
JSON_S("count") ","
|
|
JSON_S("size") ","
|
|
JSON_S("children"))));
|
|
#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());
|
|
writer_->AddString(",\"trace_function_count\":");
|
|
uint32_t count = 0;
|
|
AllocationTracker* tracker = snapshot_->profiler()->allocation_tracker();
|
|
if (tracker) {
|
|
count = tracker->function_info_list().length();
|
|
}
|
|
writer_->AddNumber(count);
|
|
}
|
|
|
|
|
|
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::SerializeTraceTree() {
|
|
AllocationTracker* tracker = snapshot_->profiler()->allocation_tracker();
|
|
if (!tracker) return;
|
|
AllocationTraceTree* traces = tracker->trace_tree();
|
|
SerializeTraceNode(traces->root());
|
|
}
|
|
|
|
|
|
void HeapSnapshotJSONSerializer::SerializeTraceNode(AllocationTraceNode* node) {
|
|
// The buffer needs space for 4 unsigned ints, 4 commas, [ and \0
|
|
const int kBufferSize =
|
|
4 * MaxDecimalDigitsIn<sizeof(unsigned)>::kUnsigned // NOLINT
|
|
+ 4 + 1 + 1;
|
|
EmbeddedVector<char, kBufferSize> buffer;
|
|
int buffer_pos = 0;
|
|
buffer_pos = utoa(node->id(), buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = utoa(node->function_info_index(), buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = utoa(node->allocation_count(), buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = utoa(node->allocation_size(), buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer[buffer_pos++] = '[';
|
|
buffer[buffer_pos++] = '\0';
|
|
writer_->AddString(buffer.start());
|
|
|
|
Vector<AllocationTraceNode*> children = node->children();
|
|
for (int i = 0; i < children.length(); i++) {
|
|
if (i > 0) {
|
|
writer_->AddCharacter(',');
|
|
}
|
|
SerializeTraceNode(children[i]);
|
|
}
|
|
writer_->AddCharacter(']');
|
|
}
|
|
|
|
|
|
// 0-based position is converted to 1-based during the serialization.
|
|
static int SerializePosition(int position, const Vector<char>& buffer,
|
|
int buffer_pos) {
|
|
if (position == -1) {
|
|
buffer[buffer_pos++] = '0';
|
|
} else {
|
|
DCHECK(position >= 0);
|
|
buffer_pos = utoa(static_cast<unsigned>(position + 1), buffer, buffer_pos);
|
|
}
|
|
return buffer_pos;
|
|
}
|
|
|
|
|
|
void HeapSnapshotJSONSerializer::SerializeTraceNodeInfos() {
|
|
AllocationTracker* tracker = snapshot_->profiler()->allocation_tracker();
|
|
if (!tracker) return;
|
|
// The buffer needs space for 6 unsigned ints, 6 commas, \n and \0
|
|
const int kBufferSize =
|
|
6 * MaxDecimalDigitsIn<sizeof(unsigned)>::kUnsigned // NOLINT
|
|
+ 6 + 1 + 1;
|
|
EmbeddedVector<char, kBufferSize> buffer;
|
|
const List<AllocationTracker::FunctionInfo*>& list =
|
|
tracker->function_info_list();
|
|
bool first_entry = true;
|
|
for (int i = 0; i < list.length(); i++) {
|
|
AllocationTracker::FunctionInfo* info = list[i];
|
|
int buffer_pos = 0;
|
|
if (first_entry) {
|
|
first_entry = false;
|
|
} else {
|
|
buffer[buffer_pos++] = ',';
|
|
}
|
|
buffer_pos = utoa(info->function_id, buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = utoa(GetStringId(info->name), buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = utoa(GetStringId(info->script_name), buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
// The cast is safe because script id is a non-negative Smi.
|
|
buffer_pos = utoa(static_cast<unsigned>(info->script_id), buffer,
|
|
buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = SerializePosition(info->line, buffer, buffer_pos);
|
|
buffer[buffer_pos++] = ',';
|
|
buffer_pos = SerializePosition(info->column, buffer, buffer_pos);
|
|
buffer[buffer_pos++] = '\n';
|
|
buffer[buffer_pos++] = '\0';
|
|
writer_->AddString(buffer.start());
|
|
}
|
|
}
|
|
|
|
|
|
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);
|
|
DCHECK(cursor != 0);
|
|
s += cursor - 1;
|
|
} else {
|
|
writer_->AddCharacter('?');
|
|
}
|
|
}
|
|
}
|
|
}
|
|
writer_->AddCharacter('\"');
|
|
}
|
|
|
|
|
|
void HeapSnapshotJSONSerializer::SerializeStrings() {
|
|
ScopedVector<const unsigned char*> sorted_strings(
|
|
strings_.occupancy() + 1);
|
|
for (HashMap::Entry* entry = strings_.Start();
|
|
entry != NULL;
|
|
entry = strings_.Next(entry)) {
|
|
int index = static_cast<int>(reinterpret_cast<uintptr_t>(entry->value));
|
|
sorted_strings[index] = reinterpret_cast<const unsigned char*>(entry->key);
|
|
}
|
|
writer_->AddString("\"<dummy>\"");
|
|
for (int i = 1; i < sorted_strings.length(); ++i) {
|
|
writer_->AddCharacter(',');
|
|
SerializeString(sorted_strings[i]);
|
|
if (writer_->aborted()) return;
|
|
}
|
|
}
|
|
|
|
|
|
} } // namespace v8::internal
|