Add Zone-based handle allocation interface and reduce use of Isolate-based interfaces.

runtime/vm/handles.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 "vm/handles.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
 #include "vm/isolate.h"
@@ skipping 25 matching lines @@
 }
 
 
 void VMHandles::VisitObjectPointers(ObjectPointerVisitor* visitor) {
   return Handles<kVMHandleSizeInWords,
                  kVMHandlesPerChunk,
                  kOffsetOfRawPtr>::VisitObjectPointers(visitor);
 }
 
 
-uword VMHandles::AllocateHandle(Isolate* isolate) {
+uword VMHandles::AllocateHandle(Zone* zone) {
   return Handles<kVMHandleSizeInWords,
                  kVMHandlesPerChunk,
-                 kOffsetOfRawPtr>::AllocateHandle(isolate);
+                 kOffsetOfRawPtr>::AllocateHandle(zone);
 }
 
 
-uword VMHandles::AllocateZoneHandle(Isolate* isolate) {
+uword VMHandles::AllocateZoneHandle(Zone* zone) {
   return Handles<kVMHandleSizeInWords,
                  kVMHandlesPerChunk,
-                 kOffsetOfRawPtr>::AllocateZoneHandle(isolate);
+                 kOffsetOfRawPtr>::AllocateZoneHandle(zone);
 }
 
 
 bool VMHandles::IsZoneHandle(uword handle) {
   return Handles<kVMHandleSizeInWords,
                  kVMHandlesPerChunk,
                  kOffsetOfRawPtr >::IsZoneHandle(handle);
 }
 
 
@@ skipping 51 matching lines @@
   isolate()->IncrementNoHandleScopeDepth();
 }
 
 
 NoHandleScope::~NoHandleScope() {
   isolate()->DecrementNoHandleScopeDepth();
 }
 #endif  // defined(DEBUG)
 
 }  // namespace dart