Use EmbedderHeapTracer instead of object grouping when trace_embedder_heap flag is set

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 1536 matching lines @@
   return heap->InNewSpace(*p) &&
          !HeapObject::cast(*p)->map_word().IsForwardingAddress();
 }
 
 
 static bool IsUnmodifiedHeapObject(Object** p) {
   Object* object = *p;
   if (object->IsSmi()) return false;
   HeapObject* heap_object = HeapObject::cast(object);
   if (!object->IsJSObject()) return false;
-  Object* obj_constructor = (JSObject::cast(object))->map()->GetConstructor();
-  if (!obj_constructor->IsJSFunction()) return false;
-  JSFunction* constructor = JSFunction::cast(obj_constructor);
-  if (!constructor->shared()->IsApiFunction()) return false;
-  if (constructor != nullptr &&
-      constructor->initial_map() == heap_object->map()) {
-    return true;
-  }
-  return false;
+  JSObject* js_object = JSObject::cast(object);
+  if (!js_object->WasConstructedFromApiFunction()) return false;
+  JSFunction* constructor =
+      JSFunction::cast(js_object->map()->GetConstructor());
+
+  return constructor->initial_map() == heap_object->map();
 }
 
 
 void PromotionQueue::Initialize() {
   // The last to-space page may be used for promotion queue. On promotion
   // conflict, we use the emergency stack.
   DCHECK((Page::kPageSize - MemoryChunk::kBodyOffset) % (2 * kPointerSize) ==
          0);
   front_ = rear_ =
       reinterpret_cast<struct Entry*>(heap_->new_space()->ToSpaceEnd());
@@ skipping 2006 matching lines @@
 
 AllocationResult Heap::CopyJSObject(JSObject* source, AllocationSite* site) {
   // Make the clone.
   Map* map = source->map();
 
   // We can only clone regexps, normal objects, api objects or arrays. Copying
   // anything else will break invariants.
   CHECK(map->instance_type() == JS_REGEXP_TYPE ||
         map->instance_type() == JS_OBJECT_TYPE ||
         map->instance_type() == JS_ARRAY_TYPE ||
+        map->instance_type() == JS_API_OBJECT_TYPE ||
         map->instance_type() == JS_SPECIAL_API_OBJECT_TYPE);
 
   int object_size = map->instance_size();
   HeapObject* clone = nullptr;
 
   DCHECK(site == NULL || AllocationSite::CanTrack(map->instance_type()));
 
   int adjusted_object_size =
       site != NULL ? object_size + AllocationMemento::kSize : object_size;
   AllocationResult allocation = AllocateRaw(adjusted_object_size, NEW_SPACE);
@@ skipping 1776 matching lines @@
 #ifdef DEBUG
   // All pages right after bootstrapping must be marked as never-evacuate.
   PagedSpaces spaces(this);
   for (PagedSpace* s = spaces.next(); s != NULL; s = spaces.next()) {
     PageIterator it(s);
     while (it.has_next()) CHECK(it.next()->NeverEvacuate());
   }
 #endif  // DEBUG
 }
 
+void Heap::SetEmbedderHeapTracer(EmbedderHeapTracer* tracer) {
+  DCHECK_NOT_NULL(tracer);
+  CHECK_NULL(embedder_heap_tracer_);
+  embedder_heap_tracer_ = tracer;
+}
+
+void Heap::TracePossibleWrapper(JSObject* js_object) {
+  DCHECK(js_object->WasConstructedFromApiFunction());
+  if (js_object->GetInternalFieldCount() >= 2 &&
+      js_object->GetInternalField(0) != undefined_value() &&
+      js_object->GetInternalField(1) != undefined_value()) {
+    mark_compact_collector()->wrappers_to_trace().push_back(
+        std::pair<Value*, Value*>(
+            reinterpret_cast<Value*>(js_object->GetInternalField(0)),
+            reinterpret_cast<Value*>(js_object->GetInternalField(1))));
+  }
+}
+
 void Heap::RegisterExternallyReferencedObject(Object** object) {
   DCHECK(mark_compact_collector()->in_use());
   HeapObject* heap_object = HeapObject::cast(*object);
   DCHECK(Contains(heap_object));
   MarkBit mark_bit = Marking::MarkBitFrom(heap_object);
   mark_compact_collector()->MarkObject(heap_object, mark_bit);
 }
 
 void Heap::TearDown() {
 #ifdef VERIFY_HEAP
@@ skipping 155 matching lines @@
   DCHECK(callback != NULL);
   for (int i = 0; i < gc_epilogue_callbacks_.length(); ++i) {
     if (gc_epilogue_callbacks_[i].callback == callback) {
       gc_epilogue_callbacks_.Remove(i);
       return;
     }
   }
   UNREACHABLE();
 }
 
-void Heap::SetEmbedderHeapTracer(EmbedderHeapTracer* tracer) {
-  DCHECK_NOT_NULL(tracer);
-  CHECK_NULL(embedder_heap_tracer_);
-  embedder_heap_tracer_ = tracer;
-}
-
 // TODO(ishell): Find a better place for this.
 void Heap::AddWeakObjectToCodeDependency(Handle<HeapObject> obj,
                                          Handle<DependentCode> dep) {
   DCHECK(!InNewSpace(*obj));
   DCHECK(!InNewSpace(*dep));
   Handle<WeakHashTable> table(weak_object_to_code_table(), isolate());
   table = WeakHashTable::Put(table, obj, dep);
   if (*table != weak_object_to_code_table())
     set_weak_object_to_code_table(*table);
   DCHECK_EQ(*dep, LookupWeakObjectToCodeDependency(obj));
@@ skipping 874 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8