[heap] Fine-grained JSArrayBuffer tracking

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 787 matching lines @@
 
   // Global inline caching age: it is incremented on some GCs after context
   // disposal. We use it to flush inline caches.
   int global_ic_age() { return global_ic_age_; }
 
   void AgeInlineCaches() {
     global_ic_age_ = (global_ic_age_ + 1) & SharedFunctionInfo::ICAgeBits::kMax;
   }
 
   int64_t amount_of_external_allocated_memory() {
-    return amount_of_external_allocated_memory_;
+    return amount_of_external_allocated_memory_.Value();
   }
 
   void update_amount_of_external_allocated_memory(int64_t delta) {
-    amount_of_external_allocated_memory_ += delta;
+    amount_of_external_allocated_memory_.Increment(delta);
   }
 
   void DeoptMarkedAllocationSites();
 
   bool DeoptMaybeTenuredAllocationSites() {
     return new_space_.IsAtMaximumCapacity() && maximum_size_scavenges_ == 0;
   }
 
   void AddWeakObjectToCodeDependency(Handle<HeapObject> obj,
                                      Handle<DependentCode> dep);
@@ skipping 1144 matching lines @@
   MUST_USE_RESULT AllocationResult InternalizeStringWithKey(HashTableKey* key);
 
   MUST_USE_RESULT AllocationResult InternalizeString(String* str);
 
   // ===========================================================================
 
   void set_force_oom(bool value) { force_oom_ = value; }
 
   // The amount of external memory registered through the API kept alive
   // by global handles
-  int64_t amount_of_external_allocated_memory_;
+  base::AtomicNumber<intptr_t> amount_of_external_allocated_memory_;
 
   // Caches the amount of external memory registered at the last global gc.
-  int64_t amount_of_external_allocated_memory_at_last_global_gc_;
+  intptr_t amount_of_external_allocated_memory_at_last_global_gc_;
 
   // This can be calculated directly from a pointer to the heap; however, it is
   // more expedient to get at the isolate directly from within Heap methods.
   Isolate* isolate_;
 
   Object* roots_[kRootListLength];
 
   size_t code_range_size_;
   int max_semi_space_size_;
   int initial_semispace_size_;
@@ skipping 653 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_