- Reduce the number of Isolate::Current() calls.

runtime/vm/allocation.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_ALLOCATION_H_
 #define VM_ALLOCATION_H_
 
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
 #include "vm/globals.h"
@@ skipping 78 matching lines @@
 class ZoneAllocated {
  public:
   ZoneAllocated() { }
   // It would be ideal if the destructor method could be made private,
   // but the g++ compiler complains when this is subclassed.
   virtual ~ZoneAllocated();
 
   // Implicitly allocate the object in the current zone.
   void* operator new(uword size);
 
+  // Implicitly allocate the object in the current zone given the current
+  // isolate.
+  void* operator new(uword size, BaseIsolate* isolate);
+
   // Ideally, the delete operator should be protected instead of
   // public, but unfortunately the compiler sometimes synthesizes
   // (unused) destructors for classes derived from ZoneObject, which
   // require the operator to be visible. MSVC requires the delete
   // operator to be public.
 
   // Disallow explicit deallocation of nodes. Nodes can only be
   // deallocated by invoking DeleteAll() on the zone they live in.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ZoneAllocated);
 };
 
 }  // namespace dart
 
 #endif  // VM_ALLOCATION_H_