Provide API support for weak handles and post-mortem finalization.

runtime/vm/isolate.h

 // Copyright (c) 2011, 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 "vm/assert.h"
 #include "vm/store_buffer.h"
 #include "vm/timer.h"
 
 namespace dart {
 
 // Forward declarations.
 class ApiState;
 class BigintStore;
 class CodeIndexTable;
 class Debugger;
 class HandleScope;
+class HandleVisitor;
 class Heap;
 class LongJump;
 class MessageQueue;
 class Mutex;
 class ObjectPointerVisitor;
 class ObjectStore;
 class RawContext;
 class RawObject;
 class StackResource;
 class StubCode;
 class Zone;
 
 class Isolate {
  public:
   ~Isolate();
 
   static inline Isolate* Current();
   static void SetCurrent(Isolate* isolate);
 
   static void InitOnce();
   static Isolate* Init();
   void Shutdown();
 
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor, bool validate_frames);
 
-  void VisitStrongObjectPointers(ObjectPointerVisitor* visitor,
-                                 bool validate_frames);
-
-  void VisitWeakObjectPointers(ObjectPointerVisitor* visitor);
+  void VisitWeakPersistentHandles(HandleVisitor* visitor);
 
   StoreBufferBlock* store_buffer() { return &store_buffer_; }
 
   Dart_PostMessageCallback post_message_callback() const {
     return post_message_callback_;
   }
   void set_post_message_callback(Dart_PostMessageCallback value) {
     post_message_callback_ = value;
   }
 
@@ skipping 254 matching lines @@
 #include "vm/isolate_linux.h"
 #elif defined(TARGET_OS_MACOS)
 #include "vm/isolate_macos.h"
 #elif defined(TARGET_OS_WINDOWS)
 #include "vm/isolate_win.h"
 #else
 #error Unknown target os.
 #endif
 
 #endif  // VM_ISOLATE_H_