[heap] Add optimized RecordWrites

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 1092 matching lines @@
 }
 
 
 void Heap::MoveElements(FixedArray* array, int dst_index, int src_index,
                         int len) {
   if (len == 0) return;
 
   DCHECK(array->map() != fixed_cow_array_map());
   Object** dst_objects = array->data_start() + dst_index;
   MemMove(dst_objects, array->data_start() + src_index, len * kPointerSize);
-  if (!InNewSpace(array)) {
-    for (int i = 0; i < len; i++) {
-      RecordWrite(array, array->OffsetOfElementAt(dst_index + i),
-                  dst_objects[i]);
-    }
-  }
-  incremental_marking()->IterateBlackObject(array);
+  FIXED_ARRAY_ELEMENTS_WRITE_BARRIER(this, array, dst_index, src_index);

[ulan, 2016/04/11 12:49:23]

src_index should be len.

 }
 
 
 #ifdef VERIFY_HEAP
 // Helper class for verifying the string table.
 class StringTableVerifier : public ObjectVisitor {
  public:
   void VisitPointers(Object** start, Object** end) override {
     // Visit all HeapObject pointers in [start, end).
     for (Object** p = start; p < end; p++) {
@@ skipping 5343 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8