Track JS allocations as they arrive with no affection on performance when tracking is switched off

test/cctest/cctest.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 330 matching lines @@
 // Helper function that simulates a full old-space in the heap.
 static inline void SimulateFullSpace(v8::internal::PagedSpace* space) {
   int old_linear_size = static_cast<int>(space->limit() - space->top());
   space->Free(space->top(), old_linear_size);
   space->SetTop(space->limit(), space->limit());
   space->ResetFreeList();
   space->ClearStats();
 }
 
 
+// Helper class for new allocations tracking and checking.
+// To use checking of JS allocations tracking in a test,
+// just create an instance of this class.
+class HeapObjectsTracker {
+ public:
+  HeapObjectsTracker() {
+    heap_profiler_ = i::Isolate::Current()->heap_profiler();
+    CHECK_NE(NULL, heap_profiler_);
+    heap_profiler_->StartHeapAllocationsRecording();
+  }
+
+  ~HeapObjectsTracker() {
+    i::Isolate::Current()->heap()->CollectAllAvailableGarbage();
+    CHECK_EQ(0, heap_profiler_->FindUntrackedObjects());
+    heap_profiler_->StopHeapAllocationsRecording();
+  }
+
+ private:
+  i::HeapProfiler* heap_profiler_;
+};
+
+
 #endif  // ifndef CCTEST_H_