Bugfix: make dependent code field in AllocationSite weak.

src/objects-visiting-inl.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 171 matching lines @@
                   void>::Visit);
 
   table_.Register(kVisitFixedArray, &FixedArrayVisitor::Visit);
 
   table_.Register(kVisitFixedDoubleArray, &DataObjectVisitor::Visit);
 
   table_.Register(kVisitConstantPoolArray, &VisitConstantPoolArray);
 
   table_.Register(kVisitNativeContext, &VisitNativeContext);
 
-  table_.Register(kVisitAllocationSite,
-                  &FixedBodyVisitor<StaticVisitor,
-                  AllocationSite::BodyDescriptor,
-                  void>::Visit);
+  table_.Register(kVisitAllocationSite, &VisitAllocationSite);
 
   table_.Register(kVisitByteArray, &DataObjectVisitor::Visit);
 
   table_.Register(kVisitFreeSpace, &DataObjectVisitor::Visit);
 
   table_.Register(kVisitSeqOneByteString, &DataObjectVisitor::Visit);
 
   table_.Register(kVisitSeqTwoByteString, &DataObjectVisitor::Visit);
 
   table_.Register(kVisitJSWeakMap, &StaticVisitor::VisitWeakCollection);
@@ skipping 176 matching lines @@
     StaticVisitor::VisitPointer(heap, slot);
   }
 
   StaticVisitor::VisitPointers(heap,
       HeapObject::RawField(object, PropertyCell::kPointerFieldsBeginOffset),
       HeapObject::RawField(object, PropertyCell::kPointerFieldsEndOffset));
 }
 
 
 template<typename StaticVisitor>
+void StaticMarkingVisitor<StaticVisitor>::VisitAllocationSite(
+    Map* map, HeapObject* object) {
+  Heap* heap = map->GetHeap();
+
+  Object** slot =
+      HeapObject::RawField(object, AllocationSite::kDependentCodeOffset);
+  if (FLAG_collect_maps) {
+    // Mark allocation site dependent codes array but do not push it onto
+    // marking stack, this will make references from it weak. We will clean
+    // dead codes when we iterate over allocation sites in
+    // ClearNonLiveReferences.
+    HeapObject* obj = HeapObject::cast(*slot);
+    heap->mark_compact_collector()->RecordSlot(slot, slot, obj);
+    StaticVisitor::MarkObjectWithoutPush(heap, obj);
+  } else {
+    StaticVisitor::VisitPointer(heap, slot);
+  }
+
+  StaticVisitor::VisitPointers(heap,
+      HeapObject::RawField(object, AllocationSite::kPointerFieldsBeginOffset),
+      HeapObject::RawField(object, AllocationSite::kPointerFieldsEndOffset));
+}
+
+
+template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitCode(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
   Code* code = Code::cast(object);
   if (FLAG_cleanup_code_caches_at_gc) {
     code->ClearTypeFeedbackCells(heap);
   }
   if (FLAG_age_code && !Serializer::enabled()) {
     code->MakeOlder(heap->mark_compact_collector()->marking_parity());
   }
@@ skipping 497 matching lines @@
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_