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

src/heap-profiler.cc

 // 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 17 matching lines @@
 #include "v8.h"
 
 #include "heap-profiler.h"
 #include "heap-snapshot-generator-inl.h"
 
 namespace v8 {
 namespace internal {
 
 HeapProfiler::HeapProfiler(Heap* heap)
     : snapshots_(new HeapSnapshotsCollection(heap)),
-      next_snapshot_uid_(1) {
+      next_snapshot_uid_(1),
+      is_tracking_allocations_(false) {
 }
 
 
 HeapProfiler::~HeapProfiler() {
   delete snapshots_;
 }
 
 
 void HeapProfiler::DeleteAllSnapshots() {
   Heap* the_heap = heap();
@@ skipping 76 matching lines @@
 }
 
 
 SnapshotObjectId HeapProfiler::GetSnapshotObjectId(Handle<Object> obj) {
   if (!obj->IsHeapObject())
     return v8::HeapProfiler::kUnknownObjectId;
   return snapshots_->FindObjectId(HeapObject::cast(*obj)->address());
 }
 
 
-void HeapProfiler::ObjectMoveEvent(Address from, Address to) {
-  snapshots_->ObjectMoveEvent(from, to);
+void HeapProfiler::ObjectMoveEvent(Address from, Address to, int size) {
+  snapshots_->ObjectMoveEvent(from, to, size);
 }
 
+
+void HeapProfiler::NewObjectEvent(Address addr, int size) {
+  snapshots_->NewObjectEvent(addr, size);
+}
+
+
 void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
                                          RetainedObjectInfo* info) {
   // TODO(yurus, marja): Don't route this information through GlobalHandles.
   heap()->isolate()->global_handles()->SetRetainedObjectInfo(id, info);
 }
 
+
+bool* HeapProfiler::is_tracking_allocations_address() {
+  return &is_tracking_allocations_;
+}
+
+
+void HeapProfiler::StartHeapAllocationsRecording() {
+  StartHeapObjectsTracking();
+  is_tracking_allocations_ = true;
+}
+
+
+void HeapProfiler::StopHeapAllocationsRecording() {
+  StopHeapObjectsTracking();
+  is_tracking_allocations_ = false;
+}
+
+
+void HeapProfiler::RecordObjectAllocationFromMasm(Isolate* isolate,
+                                                  Address obj,
+                                                  int size) {
+  isolate->heap_profiler()->NewObjectEvent(obj, size);
+}
+
+
+int HeapProfiler::FindUntrackedObjects() {
+  return snapshots_->FindUntrackedObjects();
+}
+
+
 } }  // namespace v8::internal