Fix memory leak caused by treating Code::next_code_link as strong in marker.

src/objects-visiting.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 133 matching lines @@
            (base == kVisitJSObject));
     ASSERT(IsAligned(object_size, kPointerSize));
     ASSERT(kMinObjectSizeInWords * kPointerSize <= object_size);
     ASSERT(object_size <= Page::kMaxRegularHeapObjectSize);
 
     const VisitorId specialization = static_cast<VisitorId>(
         base + (object_size >> kPointerSizeLog2) - kMinObjectSizeInWords);
 
     return Min(specialization, generic);
   }
+
+  static WeakPointerMode weak_pointer_mode() {
+    return VISIT_WEAK_POINTERS;
+  }
 };
 
 
 template<typename Callback>
 class VisitorDispatchTable {
  public:
   void CopyFrom(VisitorDispatchTable* other) {
     // We are not using memcpy to guarantee that during update
     // every element of callbacks_ array will remain correct
     // pointer (memcpy might be implemented as a byte copying loop).
@@ skipping 249 matching lines @@
   INLINE(static void VisitCodeTarget(Heap* heap, RelocInfo* rinfo));
   INLINE(static void VisitCodeAgeSequence(Heap* heap, RelocInfo* rinfo));
   INLINE(static void VisitExternalReference(RelocInfo* rinfo)) { }
   INLINE(static void VisitRuntimeEntry(RelocInfo* rinfo)) { }
 
   // TODO(mstarzinger): This should be made protected once refactoring is done.
   // Mark non-optimize code for functions inlined into the given optimized
   // code. This will prevent it from being flushed.
   static void MarkInlinedFunctionsCode(Heap* heap, Code* code);
 
+  static WeakPointerMode weak_pointer_mode() {
+    return SKIP_WEAK_POINTERS;
+  }
+
  protected:
   INLINE(static void VisitMap(Map* map, HeapObject* object));
   INLINE(static void VisitCode(Map* map, HeapObject* object));
   INLINE(static void VisitSharedFunctionInfo(Map* map, HeapObject* object));
   INLINE(static void VisitConstantPoolArray(Map* map, HeapObject* object));
   INLINE(static void VisitJSFunction(Map* map, HeapObject* object));
   INLINE(static void VisitJSRegExp(Map* map, HeapObject* object));
   INLINE(static void VisitJSArrayBuffer(Map* map, HeapObject* object));
   INLINE(static void VisitJSTypedArray(Map* map, HeapObject* object));
   INLINE(static void VisitJSDataView(Map* map, HeapObject* object));
@@ skipping 44 matching lines @@
 
 
 template<typename StaticVisitor>
 VisitorDispatchTable<typename StaticMarkingVisitor<StaticVisitor>::Callback>
     StaticMarkingVisitor<StaticVisitor>::table_;
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_H_