New GC APIs, try 2.

src/heap-snapshot-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1922 matching lines @@
 
 void NativeObjectsExplorer::FillRetainedObjects() {
   if (embedder_queried_) return;
   Isolate* isolate = Isolate::Current();
   const GCType major_gc_type = kGCTypeMarkSweepCompact;
   // Record objects that are joined into ObjectGroups.
   isolate->heap()->CallGCPrologueCallbacks(major_gc_type);
   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]);
+    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.
+    group->info = NULL;  // Acquire info object ownership.
   }
   isolate->global_handles()->RemoveObjectGroups();
   isolate->heap()->CallGCEpilogueCallbacks(major_gc_type);
   // Record objects that are not in ObjectGroups, but have class ID.
   GlobalHandlesExtractor extractor(this);
   isolate->global_handles()->IterateAllRootsWithClassIds(&extractor);
   embedder_queried_ = true;
 }
 
 void NativeObjectsExplorer::FillImplicitReferences() {
   Isolate* isolate = Isolate::Current();
   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_;
+    HeapObject* parent = *group->parent;
     int parent_entry =
         filler_->FindOrAddEntry(parent, native_entries_allocator_)->index();
     ASSERT(parent_entry != HeapEntry::kNoEntry);
-    Object*** children = group->children_;
-    for (size_t j = 0; j < group->length_; ++j) {
+    Object*** 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);
     }
   }
@@ skipping 676 matching lines @@
 
 
 void HeapSnapshotJSONSerializer::SortHashMap(
     HashMap* map, List<HashMap::Entry*>* sorted_entries) {
   for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p))
     sorted_entries->Add(p);
   sorted_entries->Sort(SortUsingEntryValue);
 }
 
 } }  // namespace v8::internal