[heap] Create a thin wrapper around wrapper tracing in V8 to avoid misuse

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 311 matching lines @@
 class AllocationObserver;
 class ArrayBufferTracker;
 class GCIdleTimeAction;
 class GCIdleTimeHandler;
 class GCIdleTimeHeapState;
 class GCTracer;
 class HeapObjectsFilter;
 class HeapStats;
 class HistogramTimer;
 class Isolate;
+class LocalEmbedderHeapTracer;
 class MemoryAllocator;
 class MemoryReducer;
 class ObjectIterator;
 class ObjectStats;
 class Page;
 class PagedSpace;
 class Scavenger;
 class ScavengeJob;
 class Space;
 class StoreBuffer;
@@ skipping 859 matching lines @@
                                          GarbageCollectionReason gc_reason);
 
   void RegisterReservationsForBlackAllocation(Reservation* reservations);
 
   IncrementalMarking* incremental_marking() { return incremental_marking_; }
 
   // ===========================================================================
   // Embedder heap tracer support. =============================================
   // ===========================================================================
 
+  LocalEmbedderHeapTracer* local_embedder_heap_tracer() {
+    return local_embedder_heap_tracer_;
+  }
   void SetEmbedderHeapTracer(EmbedderHeapTracer* tracer);
-
-  bool UsingEmbedderHeapTracer() { return embedder_heap_tracer() != nullptr; }
-
   void TracePossibleWrapper(JSObject* js_object);
-
   void RegisterExternallyReferencedObject(Object** object);
 
-  void RegisterWrappersWithEmbedderHeapTracer();
-
-  // In order to avoid running out of memory we force tracing wrappers if there
-  // are too many of them.
-  bool RequiresImmediateWrapperProcessing();
-
-  EmbedderHeapTracer* embedder_heap_tracer() { return embedder_heap_tracer_; }
-
-  size_t wrappers_to_trace() { return wrappers_to_trace_.size(); }
-  void clear_wrappers_to_trace() { wrappers_to_trace_.clear(); }
-
   // ===========================================================================
   // External string table API. ================================================
   // ===========================================================================
 
   // Registers an external string.
   inline void RegisterExternalString(String* string);
 
   // Finalizes an external string by deleting the associated external
   // data and clearing the resource pointer.
   inline void FinalizeExternalString(String* string);
@@ skipping 1099 matching lines @@
 
   int gc_callbacks_depth_;
 
   bool deserialization_complete_;
 
   StrongRootsList* strong_roots_list_;
 
   // The depth of HeapIterator nestings.
   int heap_iterator_depth_;
 
-  EmbedderHeapTracer* embedder_heap_tracer_;
-  std::vector<std::pair<void*, void*>> wrappers_to_trace_;
+  LocalEmbedderHeapTracer* local_embedder_heap_tracer_;
 
   // Used for testing purposes.
   bool force_oom_;
   bool delay_sweeper_tasks_for_testing_;
 
   // Classes in "heap" can be friends.
   friend class AlwaysAllocateScope;
   friend class GCCallbacksScope;
   friend class GCTracer;
   friend class HeapIterator;
@@ skipping 305 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_