Introduce EmbedderHeapTracer

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 895 matching lines @@
   }
 
   // Returns name of the space.
   const char* GetSpaceName(int idx);
 
   // ===========================================================================
   // Getters to other components. ==============================================
   // ===========================================================================
 
   GCTracer* tracer() { return tracer_; }
+  EmbedderHeapTracer* embedder_heap_tracer() { return embedder_heap_tracer_; }
 
   PromotionQueue* promotion_queue() { return &promotion_queue_; }
 
   inline Isolate* isolate();
 
   MarkCompactCollector* mark_compact_collector() {
     return mark_compact_collector_;
   }
 
   // ===========================================================================
@@ skipping 377 matching lines @@
                              GCType gc_type_filter, bool pass_isolate = true);
   void RemoveGCPrologueCallback(v8::Isolate::GCCallback callback);
 
   void AddGCEpilogueCallback(v8::Isolate::GCCallback callback,
                              GCType gc_type_filter, bool pass_isolate = true);
   void RemoveGCEpilogueCallback(v8::Isolate::GCCallback callback);
 
   void CallGCPrologueCallbacks(GCType gc_type, GCCallbackFlags flags);
   void CallGCEpilogueCallbacks(GCType gc_type, GCCallbackFlags flags);
 
+  void SetEmbedderHeapTracer(EmbedderHeapTracer* tracer);
+  void UnsetEmbedderHeapTracer();
+
   // ===========================================================================
   // Allocation methods. =======================================================
   // ===========================================================================
 
   // Creates a filler object and returns a heap object immediately after it.
   MUST_USE_RESULT HeapObject* PrecedeWithFiller(HeapObject* object,
                                                 int filler_size);
 
   // Creates a filler object if needed for alignment and returns a heap object
   // immediately after it. If any space is left after the returned object,
@@ skipping 747 matching lines @@
 
   // List of encountered weak collections (JSWeakMap and JSWeakSet) during
   // marking. It is initialized during marking, destroyed after marking and
   // contains Smi(0) while marking is not active.
   Object* encountered_weak_collections_;
 
   Object* encountered_weak_cells_;
 
   Object* encountered_transition_arrays_;
 
+  List<GCCallbackPair> gc_prologue_callbacks_;
   List<GCCallbackPair> gc_epilogue_callbacks_;
-  List<GCCallbackPair> gc_prologue_callbacks_;
 
   // Total RegExp code ever generated
   double total_regexp_code_generated_;
 
   int deferred_counters_[v8::Isolate::kUseCounterFeatureCount];
 
   GCTracer* tracer_;
+  EmbedderHeapTracer* embedder_heap_tracer_;
 
   int high_survival_rate_period_length_;
   intptr_t promoted_objects_size_;
   double promotion_ratio_;
   double promotion_rate_;
   intptr_t semi_space_copied_object_size_;
   intptr_t previous_semi_space_copied_object_size_;
   double semi_space_copied_rate_;
   int nodes_died_in_new_space_;
   int nodes_copied_in_new_space_;
@@ skipping 539 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_