Use WeakCell to handle the script wrapper cache

src/objects.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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 842 matching lines @@
 class AllocationSiteCreationContext;
 class AllocationSiteUsageContext;
 class DictionaryElementsAccessor;
 class ElementsAccessor;
 class FixedArrayBase;
 class GlobalObject;
 class ObjectVisitor;
 class LookupIterator;
 class StringStream;
 class TypeFeedbackVector;
+class WeakCell;
 // We cannot just say "class HeapType;" if it is created from a template... =8-?
 template<class> class TypeImpl;
 struct HeapTypeConfig;
 typedef TypeImpl<HeapTypeConfig> HeapType;
 
 
 // A template-ized version of the IsXXX functions.
 template <class C> inline bool Is(Object* obj);
 
 #ifdef VERIFY_HEAP
@@ skipping 5565 matching lines @@
   // [line_offset]: script line offset in resource from where it was extracted.
   DECL_ACCESSORS(line_offset, Smi)
 
   // [column_offset]: script column offset in resource from where it was
   // extracted.
   DECL_ACCESSORS(column_offset, Smi)
 
   // [context_data]: context data for the context this script was compiled in.
   DECL_ACCESSORS(context_data, Object)
 
-  // [wrapper]: the wrapper cache.
-  DECL_ACCESSORS(wrapper, Foreign)
+  // [wrapper]: the wrapper cache.  This is either undefined or a WeakCell.
+  DECL_ACCESSORS(wrapper, HeapObject)
 
   // [type]: the script type.
   DECL_ACCESSORS(type, Smi)
 
   // [line_ends]: FixedArray of line ends positions.
   DECL_ACCESSORS(line_ends, Object)
 
   // [eval_from_shared]: for eval scripts the shared funcion info for the
   // function from which eval was called.
   DECL_ACCESSORS(eval_from_shared, Object)
@@ skipping 41 matching lines @@
   static int GetLineNumber(Handle<Script> script, int code_pos);
   int GetLineNumber(int code_pos);
 
   static Handle<Object> GetNameOrSourceURL(Handle<Script> script);
 
   // Init line_ends array with code positions of line ends inside script source.
   static void InitLineEnds(Handle<Script> script);
 
   // Get the JS object wrapping the given script; create it if none exists.
   static Handle<JSObject> GetWrapper(Handle<Script> script);
-  void ClearWrapperCache();
 
   // Dispatched behavior.
   DECLARE_PRINTER(Script)
   DECLARE_VERIFIER(Script)
 
   static const int kSourceOffset = HeapObject::kHeaderSize;
   static const int kNameOffset = kSourceOffset + kPointerSize;
   static const int kLineOffsetOffset = kNameOffset + kPointerSize;
   static const int kColumnOffsetOffset = kLineOffsetOffset + kPointerSize;
   static const int kContextOffset = kColumnOffsetOffset + kPointerSize;
@@ skipping 4375 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_