Make objects embedded in optimized code weak.

src/objects-inl.h

 // Copyright 2012 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 5984 matching lines @@
 }
 
 
 template <int entrysize>
 MaybeObject* ObjectHashTableShape<entrysize>::AsObject(Heap* heap,
                                                        Object* key) {
   return key;
 }
 
 
+template <int entrysize>
+bool WeakHashTableShape<entrysize>::IsMatch(Object* key, Object* other) {
+  return key->SameValue(other);
+}
+
+
+template <int entrysize>
+uint32_t WeakHashTableShape<entrysize>::Hash(Object* key) {
+  intptr_t hash = reinterpret_cast<intptr_t>(key);
+  return (uint32_t)(hash & 0xFFFFFFFF);
+}
+
+
+template <int entrysize>
+uint32_t WeakHashTableShape<entrysize>::HashForObject(Object* key,
+                                                      Object* other) {
+  intptr_t hash = reinterpret_cast<intptr_t>(other);
+  return (uint32_t)(hash & 0xFFFFFFFF);
+}
+
+
+template <int entrysize>
+MaybeObject* WeakHashTableShape<entrysize>::AsObject(Heap* heap,
+                                                    Object* key) {
+  return key;
+}
+
+
 void Map::ClearCodeCache(Heap* heap) {
   // No write barrier is needed since empty_fixed_array is not in new space.
   // Please note this function is used during marking:
   //  - MarkCompactCollector::MarkUnmarkedObject
   //  - IncrementalMarking::Step
   ASSERT(!heap->InNewSpace(heap->empty_fixed_array()));
   WRITE_FIELD(this, kCodeCacheOffset, heap->empty_fixed_array());
 }
 
 
@@ skipping 284 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_