Weak Cells

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index df3d2c674390cc404961e710934b3e261d476d64..7186bb6dac9e540e75d7c27fda50ccbf6fab9946 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -52,6 +52,7 @@ namespace internal {
   V(Map, fixed_cow_array_map, FixedCOWArrayMap)                                \
   V(Map, fixed_double_array_map, FixedDoubleArrayMap)                          \
   V(Map, constant_pool_array_map, ConstantPoolArrayMap)                        \
+  V(Map, weak_cell_map, WeakCellMap)                                           \
   V(Oddball, no_interceptor_result_sentinel, NoInterceptorResultSentinel)      \
   V(Map, hash_table_map, HashTableMap)                                         \
   V(Map, ordered_hash_table_map, OrderedHashTableMap)                          \
@@ -223,6 +224,7 @@ namespace internal {
   V(fixed_cow_array_map)                \
   V(fixed_double_array_map)             \
   V(constant_pool_array_map)            \
+  V(weak_cell_map)                      \
   V(no_interceptor_result_sentinel)     \
   V(hash_table_map)                     \
   V(ordered_hash_table_map)             \
@@ -829,6 +831,11 @@ class Heap {
     return encountered_weak_collections_;
   }
 
+  void set_encountered_weak_cells(Object* weak_cell) {
+    encountered_weak_cells_ = weak_cell;
+  }
+  Object* encountered_weak_cells() const { return encountered_weak_cells_; }
+
   // Number of mark-sweeps.
   unsigned int ms_count() { return ms_count_; }
 
@@ -1559,6 +1566,8 @@ class Heap {
   // contains Smi(0) while marking is not active.
   Object* encountered_weak_collections_;
 
+  Object* encountered_weak_cells_;
+
   StoreBufferRebuilder store_buffer_rebuilder_;
 
   struct StringTypeTable {
@@ -1839,6 +1848,8 @@ class Heap {
   // Allocate a tenured JS global property cell initialized with the hole.
   MUST_USE_RESULT AllocationResult AllocatePropertyCell();
 
+  MUST_USE_RESULT AllocationResult AllocateWeakCell(HeapObject* value);
+
   // Allocates a new utility object in the old generation.
   MUST_USE_RESULT AllocationResult AllocateStruct(InstanceType type);