Added code to trace zone and handles creation/deletion under flags

vm/handles_impl.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_HANDLES_IMPL_H_
 #define VM_HANDLES_IMPL_H_
 
 #include "vm/heap.h"
 #include "vm/heap_trace.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
-DECLARE_DEBUG_FLAG(bool, trace_handles_count);
+DECLARE_DEBUG_FLAG(bool, trace_handles);
 
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 void Handles<kHandleSizeInWords,
              kHandlesPerChunk,
              kOffsetOfRawPtr>::VisitObjectPointers(
     ObjectPointerVisitor* visitor) {
   // Visit all zone handles.
   HandlesBlock* block = zone_blocks_;
   while (block != NULL) {
     block->VisitObjectPointers(visitor);
@@ skipping 153 matching lines @@
     delete block;
   }
 }
 
 
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 void Handles<kHandleSizeInWords,
              kHandlesPerChunk,
              kOffsetOfRawPtr>::SetupNextScopeBlock() {
 #if defined(DEBUG)
-  if (FLAG_trace_handles_count) {
-    OS::Print("Handle Counts:  Zone = %d, Scoped = %d\n",
-              CountZoneHandles(), CountScopedHandles());
+  if (FLAG_trace_handles) {
+    OS::PrintErr("***   Handle Counts for (0x%"Px"):Zone = %d,Scoped = %d\n",
+                 reinterpret_cast<intptr_t>(this),
+                 CountZoneHandles(), CountScopedHandles());
   }
 #endif
   if (scoped_blocks_->next_block() == NULL) {
     scoped_blocks_->set_next_block(new HandlesBlock(NULL));
   }
   scoped_blocks_ = scoped_blocks_->next_block();
   scoped_blocks_->set_next_handle_slot(0);
 #if defined(DEBUG)
   scoped_blocks_->ZapFreeHandles();
 #endif
@@ skipping 31 matching lines @@
   }
   return false;
 }
 
 
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 void Handles<kHandleSizeInWords,
              kHandlesPerChunk,
              kOffsetOfRawPtr>::SetupNextZoneBlock() {
 #if defined(DEBUG)
-  if (FLAG_trace_handles_count) {
-    OS::Print("Handle Counts:  Zone = %d, Scoped = %d\n",
-              CountZoneHandles(), CountScopedHandles());
+  if (FLAG_trace_handles) {
+    OS::PrintErr("***   Handle Counts for (0x%"Px"):Zone = %d,Scoped = %d\n",
+                 reinterpret_cast<intptr_t>(this),
+                 CountZoneHandles(), CountScopedHandles());
   }
 #endif
   zone_blocks_ = new HandlesBlock(zone_blocks_);
   ASSERT(zone_blocks_ != NULL);
 }
 
 
 #if defined(DEBUG)
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 void Handles<kHandleSizeInWords,
@@ skipping 138 matching lines @@
 template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
 int Handles<kHandleSizeInWords,
             kHandlesPerChunk,
             kOffsetOfRawPtr>::HandlesBlock::HandleCount() const {
   return (next_handle_slot_ / kHandleSizeInWords);
 }
 
 }  // namespace dart
 
 #endif  // VM_HANDLES_IMPL_H_