Keep track of array buffers in new space separately

src/heap/heap.h

 // Copyright 2012 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 1492 matching lines @@
   // by runtime. Allocations of target space for object evacuation do not
   // trigger the event. In order to track ALL allocations one must turn off
   // FLAG_inline_new and FLAG_use_allocation_folding.
   inline void OnAllocationEvent(HeapObject* object, int size_in_bytes);
 
   // This event is triggered after object is moved to a new place.
   inline void OnMoveEvent(HeapObject* target, HeapObject* source,
                           int size_in_bytes);
 
   bool deserialization_complete() const { return deserialization_complete_; }
 

[Hannes Payer (out of office), 2015/05/12 06:33:28]

Please add a bunch of comments about what these functions are doing.

-  void RegisterNewArrayBuffer(void* data, size_t length);
-  void UnregisterArrayBuffer(void* data);
-  void RegisterLiveArrayBuffer(void* data);
-  void FreeDeadArrayBuffers();
+  void RegisterNewArrayBuffer(bool in_new_space, void* data, size_t length);
+  void UnregisterArrayBuffer(bool in_new_space, void* data);
+  void RegisterLiveArrayBuffer(bool in_new_space, void* data);
+  void FreeDeadArrayBuffers(bool in_new_space);
+  void PrepareArrayBufferDiscoveryInNewSpace();
+  void PromoteArrayBuffer(JSArrayBuffer* buffer);
 
  protected:
   // Methods made available to tests.
 
   // Allocates a JS Map in the heap.
   MUST_USE_RESULT AllocationResult
       AllocateMap(InstanceType instance_type, int instance_size,
                   ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND);
 
   // Allocates and initializes a new JavaScript object based on a
@@ skipping 645 matching lines @@
 
   base::Mutex relocation_mutex_;
 
   int gc_callbacks_depth_;
 
   bool deserialization_complete_;
 
   bool concurrent_sweeping_enabled_;
 
   std::map<void*, size_t> live_array_buffers_;
+  std::map<void*, size_t> live_new_array_buffers_;
   std::map<void*, size_t> not_yet_discovered_array_buffers_;
+  std::map<void*, size_t> not_yet_discovered_new_array_buffers_;
 
   struct StrongRootsList;
   StrongRootsList* strong_roots_list_;
 
   friend class AlwaysAllocateScope;
   friend class Deserializer;
   friend class Factory;
   friend class GCCallbacksScope;
   friend class GCTracer;
   friend class HeapIterator;
@@ skipping 445 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_