Disable zapping of global handles in release mode.

src/global-handles.cc

 // Copyright 2009 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 54 matching lines @@
     STATIC_ASSERT(static_cast<int>(NodeState::kMask) ==
                   Internals::kNodeStateMask);
     STATIC_ASSERT(WEAK == Internals::kNodeStateIsWeakValue);
     STATIC_ASSERT(NEAR_DEATH == Internals::kNodeStateIsNearDeathValue);
     STATIC_ASSERT(static_cast<int>(IsIndependent::kShift) ==
                   Internals::kNodeIsIndependentShift);
     STATIC_ASSERT(static_cast<int>(IsPartiallyDependent::kShift) ==
                   Internals::kNodeIsPartiallyDependentShift);
   }
 
-#ifdef DEBUG
+#ifdef ENABLE_EXTRA_CHECKS
   ~Node() {
     // TODO(1428): if it's a weak handle we should have invoked its callback.
     // Zap the values for eager trapping.
     object_ = reinterpret_cast<Object*>(kGlobalHandleZapValue);
     class_id_ = v8::HeapProfiler::kPersistentHandleNoClassId;
     index_ = 0;
     set_independent(false);
     set_partially_dependent(false);
     set_in_new_space_list(false);
     parameter_or_next_free_.next_free = NULL;
@@ skipping 18 matching lines @@
     set_partially_dependent(false);
     set_state(NORMAL);
     parameter_or_next_free_.parameter = NULL;
     near_death_callback_ = NULL;
     IncreaseBlockUses(global_handles);
   }
 
   void Release(GlobalHandles* global_handles) {
     ASSERT(state() != FREE);
     set_state(FREE);
-    // TODO(mstarzinger): Put behind debug flag once embedders are stabilized.
+#ifdef ENABLE_EXTRA_CHECKS
+    // Zap the values for eager trapping.
     object_ = reinterpret_cast<Object*>(kGlobalHandleZapValue);
-#ifdef DEBUG
-    // Zap the values for eager trapping.
     class_id_ = v8::HeapProfiler::kPersistentHandleNoClassId;
     set_independent(false);
     set_partially_dependent(false);
     near_death_callback_ = NULL;
 #endif
     parameter_or_next_free_.next_free = global_handles->first_free_;
     global_handles->first_free_ = this;
     DecreaseBlockUses(global_handles);
   }
 
@@ skipping 730 matching lines @@
   implicit_ref_groups_.Clear();
 }
 
 
 void GlobalHandles::TearDown() {
   // TODO(1428): invoke weak callbacks.
 }
 
 
 } }  // namespace v8::internal