Added following dart API changes to enable more efficient access based

runtime/vm/isolate.h

 // Copyright (c) 2013, 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_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/thread.h"
@@ skipping 689 matching lines @@
   static Dart_IsolateInterruptCallback interrupt_callback_;
   static Dart_IsolateUnhandledExceptionCallback unhandled_exception_callback_;
   static Dart_IsolateShutdownCallback shutdown_callback_;
   static Dart_FileOpenCallback file_open_callback_;
   static Dart_FileReadCallback file_read_callback_;
   static Dart_FileWriteCallback file_write_callback_;
   static Dart_FileCloseCallback file_close_callback_;
   static Dart_IsolateInterruptCallback vmstats_callback_;
 
   friend class ReusableHandleScope;
+  friend class ReusableObjectHandleScope;
   DISALLOW_COPY_AND_ASSIGN(Isolate);
 };
 
-// The class ReusableHandleScope is used in regions of the
-// virtual machine where isolate specific reusable handles are used.
-// This class asserts that we do not add code that will result in recursive
-// uses of reusable handles.
-// It is used as follows:
-// {
-//   ReusableHandleScope reused_handles(isolate);
-//   ....
-//   .....
-//   code that uses isolate specific reusable handles.
-//   Array& funcs = reused_handles.ArrayHandle();
-//   ....
-// }
-#if defined(DEBUG)
-class ReusableHandleScope : public StackResource {
- public:
-  explicit ReusableHandleScope(Isolate* isolate)
-      : StackResource(isolate), isolate_(isolate) {
-    ASSERT(!isolate->reusable_handle_scope_active());
-    isolate->set_reusable_handle_scope_active(true);
-  }
-  ReusableHandleScope()
-      : StackResource(Isolate::Current()), isolate_(Isolate::Current()) {
-    ASSERT(!isolate()->reusable_handle_scope_active());
-    isolate()->set_reusable_handle_scope_active(true);
-  }
-  ~ReusableHandleScope() {
-    ASSERT(isolate()->reusable_handle_scope_active());
-    isolate()->set_reusable_handle_scope_active(false);
-    ResetHandles();
-  }
-
-#define REUSABLE_HANDLE_ACCESSORS(object)                                      \
-  object& object##Handle() {                                                   \
-    ASSERT(isolate_->object##_handle_ != NULL);                                \
-    return *isolate_->object##_handle_;                                        \
-  }                                                                            \
-
-  REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_ACCESSORS)
-#undef REUSABLE_HANDLE_ACCESSORS
-
- private:
-  void ResetHandles();
-  Isolate* isolate_;
-  DISALLOW_COPY_AND_ASSIGN(ReusableHandleScope);
-};
-#else
-class ReusableHandleScope : public ValueObject {
- public:
-  explicit ReusableHandleScope(Isolate* isolate) : isolate_(isolate) {
-  }
-  ReusableHandleScope() : isolate_(Isolate::Current()) {
-  }
-  ~ReusableHandleScope() {
-    ResetHandles();
-  }
-
-#define REUSABLE_HANDLE_ACCESSORS(object)                                      \
-  object& object##Handle() {                                                   \
-    ASSERT(isolate_->object##_handle_ != NULL);                                \
-    return *isolate_->object##_handle_;                                        \
-  }                                                                            \
-
-  REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_ACCESSORS)
-#undef REUSABLE_HANDLE_ACCESSORS
-
- private:
-  void ResetHandles();
-  Isolate* isolate_;
-  DISALLOW_COPY_AND_ASSIGN(ReusableHandleScope);
-};
-#endif  // defined(DEBUG)
-
-
 
 // When we need to execute code in an isolate, we use the
 // StartIsolateScope.
 class StartIsolateScope {
  public:
   explicit StartIsolateScope(Isolate* new_isolate)
       : new_isolate_(new_isolate), saved_isolate_(Isolate::Current()) {
     ASSERT(new_isolate_ != NULL);
     if (saved_isolate_ != new_isolate_) {
       ASSERT(Isolate::Current() == NULL);
@@ skipping 73 matching lines @@
   Isolate* isolate_;
   char* script_url_;
   char* library_url_;
   char* function_name_;
   char* exception_callback_name_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_