[objects] do not visit ArrayBuffer's backing store

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1487 matching lines @@
 #if 0
   // TODO(jochen): Enable eventually.
   } else if (type == JS_FUNCTION_TYPE) {
     return HeapObjectContents::kMixedValues;
 #endif
   } else if (type == BYTECODE_ARRAY_TYPE) {
     return HeapObjectContents::kMixedValues;
   } else if (type >= FIRST_FIXED_TYPED_ARRAY_TYPE &&
              type <= LAST_FIXED_TYPED_ARRAY_TYPE) {
     return HeapObjectContents::kMixedValues;
+  } else if (type == JS_ARRAY_BUFFER_TYPE) {
+    return HeapObjectContents::kMixedValues;
   } else if (type <= LAST_DATA_TYPE) {
     // TODO(jochen): Why do we claim that Code and Map contain only raw values?
     return HeapObjectContents::kRawValues;
   } else {
     if (FLAG_unbox_double_fields) {
       LayoutDescriptorHelper helper(map());
       if (!helper.all_fields_tagged()) return HeapObjectContents::kMixedValues;
     }
     return HeapObjectContents::kTaggedValues;
   }
@@ skipping 5061 matching lines @@
 
 
 bool JSArrayBuffer::is_shared() { return IsShared::decode(bit_field()); }
 
 
 void JSArrayBuffer::set_is_shared(bool value) {
   set_bit_field(IsShared::update(bit_field(), value));
 }
 
 
+// static
+template <typename StaticVisitor>
+void JSArrayBuffer::JSArrayBufferIterateBody(Heap* heap, HeapObject* obj) {
+  StaticVisitor::VisitPointers(
+      heap, obj,
+      HeapObject::RawField(obj, JSArrayBuffer::BodyDescriptor::kStartOffset),
+      HeapObject::RawField(obj,
+                           JSArrayBuffer::kByteLengthOffset + kPointerSize));
+  StaticVisitor::VisitPointers(
+      heap, obj, HeapObject::RawField(obj, JSArrayBuffer::kSize),
+      HeapObject::RawField(obj, JSArrayBuffer::kSizeWithInternalFields));
+}
+
+
+void JSArrayBuffer::JSArrayBufferIterateBody(HeapObject* obj,
+                                             ObjectVisitor* v) {
+  v->VisitPointers(
+      HeapObject::RawField(obj, JSArrayBuffer::BodyDescriptor::kStartOffset),
+      HeapObject::RawField(obj,
+                           JSArrayBuffer::kByteLengthOffset + kPointerSize));
+  v->VisitPointers(
+      HeapObject::RawField(obj, JSArrayBuffer::kSize),
+      HeapObject::RawField(obj, JSArrayBuffer::kSizeWithInternalFields));
+}
+
+
 Object* JSArrayBufferView::byte_offset() const {
   if (WasNeutered()) return Smi::FromInt(0);
   return Object::cast(READ_FIELD(this, kByteOffsetOffset));
 }
 
 
 void JSArrayBufferView::set_byte_offset(Object* value, WriteBarrierMode mode) {
   WRITE_FIELD(this, kByteOffsetOffset, value);
   CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kByteOffsetOffset, value, mode);
 }
@@ skipping 1306 matching lines @@
 #undef READ_INT64_FIELD
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_