Treat weak references in context weakly in write barrier.

src/heap/objects-visiting.cc

 // Copyright 2011 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.
 
 #include "src/v8.h"
 
 #include "src/heap/objects-visiting.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 269 matching lines @@
 
   static void VisitLiveObject(Heap*, Code*, WeakObjectRetainer*) {}
 
   static void VisitPhantomObject(Heap*, Code*) {}
 };
 
 
 template <>
 struct WeakListVisitor<Context> {
   static void SetWeakNext(Context* context, Object* next) {
-    context->set(Context::NEXT_CONTEXT_LINK, next, UPDATE_WRITE_BARRIER);
+    context->set(Context::NEXT_CONTEXT_LINK, next, UPDATE_WEAK_WRITE_BARRIER);
   }
 
   static Object* WeakNext(Context* context) {
     return context->get(Context::NEXT_CONTEXT_LINK);
   }
 
   static int WeakNextOffset() {
     return FixedArray::SizeFor(Context::NEXT_CONTEXT_LINK);
   }
 
@@ skipping 54 matching lines @@
 };
 
 
 template Object* VisitWeakList<Context>(Heap* heap, Object* list,
                                         WeakObjectRetainer* retainer);
 
 template Object* VisitWeakList<AllocationSite>(Heap* heap, Object* list,
                                                WeakObjectRetainer* retainer);
 }
 }  // namespace v8::internal