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

vm/zone_test.cc

 // 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.
 
 #include "platform/assert.h"
 #include "vm/dart.h"
 #include "vm/isolate.h"
 #include "vm/unit_test.h"
 #include "vm/zone.h"
 
 namespace dart {
 
-DECLARE_DEBUG_FLAG(bool, trace_zone_sizes);
+DECLARE_DEBUG_FLAG(bool, trace_zones);
 
 UNIT_TEST_CASE(AllocateZone) {
 #if defined(DEBUG)
-  FLAG_trace_zone_sizes = true;
+  FLAG_trace_zones = true;
 #endif
   Isolate* isolate = Isolate::Init(NULL);
   EXPECT(Isolate::Current() == isolate);
   EXPECT(isolate->current_zone() == NULL);
   {
     StackZone stack_zone(isolate);
     EXPECT(isolate->current_zone() != NULL);
     Zone* zone = stack_zone.GetZone();
     intptr_t allocated_size = 0;
 
@@ skipping 41 matching lines @@
     EXPECT_LE(allocated_size, zone->SizeInBytes());
   }
   EXPECT(isolate->current_zone() == NULL);
   isolate->Shutdown();
   delete isolate;
 }
 
 
 UNIT_TEST_CASE(AllocGeneric_Success) {
 #if defined(DEBUG)
-  FLAG_trace_zone_sizes = true;
+  FLAG_trace_zones = true;
 #endif
   Isolate* isolate = Isolate::Init(NULL);
   EXPECT(Isolate::Current() == isolate);
   EXPECT(isolate->current_zone() == NULL);
   {
     StackZone zone(isolate);
     EXPECT(isolate->current_zone() != NULL);
     intptr_t allocated_size = 0;
 
     const intptr_t kNumElements = 1000;
     zone.GetZone()->Alloc<uint32_t>(kNumElements);
     allocated_size += sizeof(uint32_t) * kNumElements;
     EXPECT_LE(allocated_size, zone.SizeInBytes());
   }
   EXPECT(isolate->current_zone() == NULL);
   isolate->Shutdown();
   delete isolate;
 }
 
 
 // This test is expected to crash.
 UNIT_TEST_CASE(AllocGeneric_Overflow) {
 #if defined(DEBUG)
-  FLAG_trace_zone_sizes = true;
+  FLAG_trace_zones = true;
 #endif
   Isolate* isolate = Isolate::Init(NULL);
   EXPECT(Isolate::Current() == isolate);
   EXPECT(isolate->current_zone() == NULL);
   {
     StackZone zone(isolate);
     EXPECT(isolate->current_zone() != NULL);
 
     const intptr_t kNumElements = (kIntptrMax / sizeof(uint32_t)) + 1;
     zone.GetZone()->Alloc<uint32_t>(kNumElements);
   }
   isolate->Shutdown();
   delete isolate;
 }
 
 
 UNIT_TEST_CASE(ZoneAllocated) {
 #if defined(DEBUG)
-  FLAG_trace_zone_sizes = true;
+  FLAG_trace_zones = true;
 #endif
   Isolate* isolate = Isolate::Init(NULL);
   EXPECT(Isolate::Current() == isolate);
   EXPECT(isolate->current_zone() == NULL);
   static int marker;
 
   class SimpleZoneObject : public ZoneAllocated {
    public:
     SimpleZoneObject() : slot(marker++) { }
     virtual int GetSlot() { return slot; }
@@ skipping 31 matching lines @@
 }
 
 
 TEST_CASE(PrintToString) {
   StackZone zone(Isolate::Current());
   const char* result = zone.GetZone()->PrintToString("Hello %s!", "World");
   EXPECT_STREQ("Hello World!", result);
 }
 
 }  // namespace dart