Decouple root visitors from object visitors.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
@@ skipping 56 matching lines @@
 class HeapObjectToIndexHashMap;
 class HeapProfiler;
 class HStatistics;
 class HTracer;
 class InlineRuntimeFunctionsTable;
 class InnerPointerToCodeCache;
 class Logger;
 class MaterializedObjectStore;
 class OptimizingCompileDispatcher;
 class RegExpStack;
+class RootVisitor;
 class RuntimeProfiler;
 class SaveContext;
 class SetupIsolateDelegate;
 class StatsTable;
 class StringTracker;
 class StubCache;
 class SweeperThread;
 class ThreadManager;
 class ThreadState;
 class ThreadVisitor;  // Defined in v8threads.h
@@ skipping 703 matching lines @@
 
   // Out of resource exception helpers.
   Object* StackOverflow();
   Object* TerminateExecution();
   void CancelTerminateExecution();
 
   void RequestInterrupt(InterruptCallback callback, void* data);
   void InvokeApiInterruptCallbacks();
 
   // Administration
-  void Iterate(ObjectVisitor* v);
-  void Iterate(ObjectVisitor* v, ThreadLocalTop* t);
-  char* Iterate(ObjectVisitor* v, char* t);
+  void Iterate(RootVisitor* v);
+  void Iterate(RootVisitor* v, ThreadLocalTop* t);
+  char* Iterate(RootVisitor* v, char* t);
   void IterateThread(ThreadVisitor* v, char* t);
 
   // Returns the current native context.
   inline Handle<Context> native_context();
   inline Context* raw_native_context();
 
   // Returns the native context of the calling JavaScript code.  That
   // is, the native context of the top-most JavaScript frame.
   Handle<Context> GetCallingNativeContext();
 
@@ skipping 239 matching lines @@
   void InvalidateArrayBufferNeuteringProtector();
 
   // Returns true if array is the initial array prototype in any native context.
   bool IsAnyInitialArrayPrototype(Handle<JSArray> array);
 
   V8_EXPORT_PRIVATE CallInterfaceDescriptorData* call_descriptor_data(
       int index);
 
   AccessCompilerData* access_compiler_data() { return access_compiler_data_; }
 
-  void IterateDeferredHandles(ObjectVisitor* visitor);
+  void IterateDeferredHandles(RootVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
   void UnlinkDeferredHandles(DeferredHandles* deferred_handles);
 
 #ifdef DEBUG
   bool IsDeferredHandle(Object** location);
 #endif  // DEBUG
 
   bool concurrent_recompilation_enabled() {
     // Thread is only available with flag enabled.
     DCHECK(optimizing_compile_dispatcher_ == NULL ||
@@ skipping 709 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_