[heap] Add optimized RecordWrites

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index 7b2f5ead9b9a3ff53617f12212ebdfe253f99eac..df9072e78020dc07f3658f4a50ff1febb4b7d049 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -399,9 +399,20 @@ void Heap::RecordWrite(Object* object, int offset, Object* o) {
   if (!InNewSpace(o) || !object->IsHeapObject() || InNewSpace(object)) {
     return;
   }
-  Page* page = Page::FromAddress(reinterpret_cast<Address>(object));
-  Address slot = HeapObject::cast(object)->address() + offset;
-  RememberedSet<OLD_TO_NEW>::Insert(page, slot);
+  RememberedSet<OLD_TO_NEW>::Insert(
+      Page::FromAddress(reinterpret_cast<Address>(object)),
+      HeapObject::cast(object)->address() + offset);
+}
+
+void Heap::RecordFixedArrayElements(FixedArray* array, int offset, int length) {
+  if (InNewSpace(array)) return;
+  Page* page = Page::FromAddress(reinterpret_cast<Address>(array));
+  for (int i = 0; i < length; i++) {
+    if (!InNewSpace(array->get(i))) continue;

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

This should be if (!InNewSpace(array->get(offset + i))) 

+    RememberedSet<OLD_TO_NEW>::Insert(
+        page,
+        reinterpret_cast<Address>(array->RawFieldOfElementAt(offset + i)));
+  }
 }