Decouple root visitors from object visitors.

src/compilation-cache.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_COMPILATION_CACHE_H_
 #define V8_COMPILATION_CACHE_H_
 
 #include "src/allocation.h"
 #include "src/objects/compilation-cache.h"
 
 namespace v8 {
 namespace internal {
 
 template <typename T>
 class Handle;
 
+class RootVisitor;
+
 // The compilation cache consists of several generational sub-caches which uses
 // this class as a base class. A sub-cache contains a compilation cache tables
 // for each generation of the sub-cache. Since the same source code string has
 // different compiled code for scripts and evals, we use separate sub-caches
 // for different compilation modes, to avoid retrieving the wrong result.
 class CompilationSubCache {
  public:
   CompilationSubCache(Isolate* isolate, int generations)
       : isolate_(isolate),
         generations_(generations) {
@@ skipping 15 matching lines @@
   void SetFirstTable(Handle<CompilationCacheTable> value) {
     DCHECK(kFirstGeneration < generations_);
     tables_[kFirstGeneration] = *value;
   }
 
   // Age the sub-cache by evicting the oldest generation and creating a new
   // young generation.
   void Age();
 
   // GC support.
-  void Iterate(ObjectVisitor* v);
+  void Iterate(RootVisitor* v);
   void IterateFunctions(ObjectVisitor* v);
 
   // Clear this sub-cache evicting all its content.
   void Clear();
 
   // Remove given shared function info from sub-cache.
   void Remove(Handle<SharedFunctionInfo> function_info);
 
   // Number of generations in this sub-cache.
   inline int generations() { return generations_; }
@@ skipping 127 matching lines @@
                  JSRegExp::Flags flags,
                  Handle<FixedArray> data);
 
   // Clear the cache - also used to initialize the cache at startup.
   void Clear();
 
   // Remove given shared function info from all caches.
   void Remove(Handle<SharedFunctionInfo> function_info);
 
   // GC support.
-  void Iterate(ObjectVisitor* v);
+  void Iterate(RootVisitor* v);
   void IterateFunctions(ObjectVisitor* v);
 
   // Notify the cache that a mark-sweep garbage collection is about to
   // take place. This is used to retire entries from the cache to
   // avoid keeping them alive too long without using them.
   void MarkCompactPrologue();
 
   // Enable/disable compilation cache. Used by debugger to disable compilation
   // cache during debugging to make sure new scripts are always compiled.
   void Enable();
@@ skipping 26 matching lines @@
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationCache);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILATION_CACHE_H_