Bugfix: make dependent code field in AllocationSite weak.

src/heap.cc

 // 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 1766 matching lines @@
 void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) {
   // We don't record weak slots during marking or scavenges.
   // Instead we do it once when we complete mark-compact cycle.
   // Note that write barrier has no effect if we are already in the middle of
   // compacting mark-sweep cycle and we have to record slots manually.
   bool record_slots =
       gc_state() == MARK_COMPACT &&
       mark_compact_collector()->is_compacting();
   ProcessArrayBuffers(retainer, record_slots);
   ProcessNativeContexts(retainer, record_slots);
+  // TODO(mvstanton): AllocationSites only need to be processed during
+  // MARK_COMPACT, as they live in old space. Verify and address.
   ProcessAllocationSites(retainer, record_slots);
 }
 
 void Heap::ProcessNativeContexts(WeakObjectRetainer* retainer,
                                  bool record_slots) {
   Object* head =
       VisitWeakList<Context>(
           this, native_contexts_list(), retainer, record_slots);
   // Update the head of the list of contexts.
   native_contexts_list_ = head;
@@ skipping 85 matching lines @@
 struct WeakListVisitor<AllocationSite> {
   static void SetWeakNext(AllocationSite* obj, Object* next) {
     obj->set_weak_next(next);
   }
 
   static Object* WeakNext(AllocationSite* obj) {
     return obj->weak_next();
   }
 
   static void VisitLiveObject(Heap* heap,
-                              AllocationSite* array_buffer,
+                              AllocationSite* site,
                               WeakObjectRetainer* retainer,
                               bool record_slots) {}
 
   static void VisitPhantomObject(Heap* heap, AllocationSite* phantom) {}
 
   static int WeakNextOffset() {
     return AllocationSite::kWeakNextOffset;
   }
 };
 
@@ skipping 6055 matching lines @@
   if (FLAG_concurrent_recompilation) {
     heap_->relocation_mutex_->Lock();
 #ifdef DEBUG
     heap_->relocation_mutex_locked_by_optimizer_thread_ =
         heap_->isolate()->optimizing_compiler_thread()->IsOptimizerThread();
 #endif  // DEBUG
   }
 }
 
 } }  // namespace v8::internal