[loggers] Guard object/code move events using mutexes.

src/heap-profiler.cc

 // Copyright 2009-2010 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.
 
 #include "src/heap-profiler.h"
 
 #include "src/allocation-tracker.h"
 #include "src/api.h"
 #include "src/heap-snapshot-generator-inl.h"
 
@@ skipping 117 matching lines @@
 
 
 SnapshotObjectId HeapProfiler::GetSnapshotObjectId(Handle<Object> obj) {
   if (!obj->IsHeapObject())
     return v8::HeapProfiler::kUnknownObjectId;
   return ids_->FindEntry(HeapObject::cast(*obj)->address());
 }
 
 
 void HeapProfiler::ObjectMoveEvent(Address from, Address to, int size) {
+  base::LockGuard<base::Mutex> guard(&profiler_mutex_);
   bool known_object = ids_->MoveObject(from, to, size);
   if (!known_object && !allocation_tracker_.is_empty()) {
     allocation_tracker_->address_to_trace()->MoveObject(from, to, size);
   }
 }
 
 
 void HeapProfiler::AllocationEvent(Address addr, int size) {
   DisallowHeapAllocation no_allocation;
   if (!allocation_tracker_.is_empty()) {
@@ skipping 35 matching lines @@
   ids_.Reset(new HeapObjectsMap(heap()));
   if (!is_tracking_allocations()) is_tracking_object_moves_ = false;
 }
 
 
 Heap* HeapProfiler::heap() const { return ids_->heap(); }
 
 
 }  // namespace internal
 }  // namespace v8