Debugger: use weak cells to implement ScriptCache.

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 873 matching lines @@
       HeapObject::cast(this)->map() ==
       HeapObject::cast(this)->GetHeap()->hash_table_map();
 }
 
 
 bool Object::IsWeakHashTable() const {
   return IsHashTable();
 }
 
 
+bool Object::IsWeakValueHashTable() const { return IsHashTable(); }
+
+
 bool Object::IsDictionary() const {
   return IsHashTable() &&
       this != HeapObject::cast(this)->GetHeap()->string_table();
 }
 
 
 bool Object::IsNameDictionary() const {
   return IsDictionary();
 }
 
@@ skipping 2525 matching lines @@
 CAST_ACCESSOR(SlicedString)
 CAST_ACCESSOR(Smi)
 CAST_ACCESSOR(String)
 CAST_ACCESSOR(StringTable)
 CAST_ACCESSOR(Struct)
 CAST_ACCESSOR(Symbol)
 CAST_ACCESSOR(UnseededNumberDictionary)
 CAST_ACCESSOR(WeakCell)
 CAST_ACCESSOR(WeakFixedArray)
 CAST_ACCESSOR(WeakHashTable)
+CAST_ACCESSOR(WeakValueHashTable)
 
 
 // static
 template <class Traits>
 STATIC_CONST_MEMBER_DEFINITION const InstanceType
     FixedTypedArray<Traits>::kInstanceType;
 
 
 template <class Traits>
 FixedTypedArray<Traits>* FixedTypedArray<Traits>::cast(Object* object) {
@@ skipping 4183 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_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_