AllocationsTracker: introduce heap-profiler-always-track-allocations flag

src/heap-profiler.h

 // Copyright 2009-2010 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 66 matching lines @@
 
   v8::RetainedObjectInfo* ExecuteWrapperClassCallback(uint16_t class_id,
                                                       Object** wrapper);
   INLINE(bool is_profiling()) {
     return snapshots_->is_tracking_objects();
   }
 
   void SetRetainedObjectInfo(UniqueId id, RetainedObjectInfo* info);
 
   bool is_tracking_allocations() {
-    return is_tracking_allocations_;
+    return is_tracking_allocations_ ||
+           FLAG_heap_profiler_always_track_allocations;

[yurys, 2013/10/28 08:17:25]

Should we also call HeapProfiler::StartHeapObjectsTracking on start if the flag
is true?

   }
 
   void StartHeapAllocationsRecording();
   void StopHeapAllocationsRecording();
 
   int FindUntrackedObjects() {
     return snapshots_->FindUntrackedObjects();
   }
 
   void DropCompiledCode();
 
  private:
   Heap* heap() const { return snapshots_->heap(); }
 
   HeapSnapshotsCollection* snapshots_;
   unsigned next_snapshot_uid_;
   List<v8::HeapProfiler::WrapperInfoCallback> wrapper_callbacks_;
   bool is_tracking_allocations_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_PROFILER_H_