[heap] Avoid the use of cells to point from code to new-space objects.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index c97c1889d1614b63298828745d6b360594bcbea5..8a41221ec33387817158540815abc51b44356f2f 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -189,6 +189,10 @@ using v8::MemoryPressureLevel;
   V(FixedArray, detached_contexts, DetachedContexts)                           \
   V(ArrayList, retained_maps, RetainedMaps)                                    \
   V(WeakHashTable, weak_object_to_code_table, WeakObjectToCodeTable)           \
+  /* weak_code_to_new_space_ref_list is an arraylist of weak cells, where */   \
+  /* slots with even indices refer to the weak object, and the subsequent */   \
+  /* slots refer to the code with the reference to the weak object. */         \
+  V(ArrayList, weak_code_to_new_space_ref_list, WeakCodeToNewSpaceRefList)     \

[ulan, 2016/06/08 14:37:00]

Lets name it weak_new_space_object_to_code_list.

[ahaas, 2016/06/09 10:34:32]

Done.

   V(PropertyCell, array_protector, ArrayProtector)                             \
   V(Cell, is_concat_spreadable_protector, IsConcatSpreadableProtector)         \
   V(PropertyCell, empty_property_cell, EmptyPropertyCell)                      \
@@ -838,6 +842,9 @@ class Heap {
     return new_space_.IsAtMaximumCapacity() && maximum_size_scavenges_ == 0;
   }
 
+  void RecordWeakCodeToNewSpaceReference(Handle<HeapObject> obj,
+                                         Handle<WeakCell> code);
+
   void AddWeakObjectToCodeDependency(Handle<HeapObject> obj,
                                      Handle<DependentCode> dep);