introduce eternal handles

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index cd75133a24367092ec07e87bd9fc451a8a9e9d64..ad785c4eb4f897287620aceec487bd38806d6cf7 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -28,6 +28,8 @@
 #ifndef V8_GLOBAL_HANDLES_H_
 #define V8_GLOBAL_HANDLES_H_
 
+#include <vector>
+
 #include "../include/v8.h"
 #include "../include/v8-profiler.h"
 
@@ -331,6 +333,54 @@ class GlobalHandles {
 };
 
 
+class EternalHandles {
+ public:
+  static const int kInvalidIndex = -1;
+  enum IndexedHandle {
+    I18N_TEMPLATE_ONE,
+    I18N_TEMPLATE_TWO,
+
+    LAST_INDEX = I18N_TEMPLATE_TWO
+  };
+
+  EternalHandles();
+  ~EternalHandles();
+
+  int NumberOfHandles() { return size_; }
+
+  int Create(Isolate* isolate, Object* object);
+
+  inline Object** Get(int index) {
+    ASSERT(index >= 0 && index < size_);
+    return &blocks_[index >> kShift][index & kMask];
+  }
+
+  inline int GetIndex(IndexedHandle i) {
+    return indexed_handles_[i];
+  }
+
+  int CreateIndexed(Isolate* isolate, Object* object, IndexedHandle i) {
+    ASSERT(GetIndex(i) == kInvalidIndex);
+    indexed_handles_[i] = Create(isolate, object);
+    return indexed_handles_[i];
+  }
+
+  void IterateAllRoots(ObjectVisitor* visitor);
+
+ private:
+  static const int kShift = 8;
+  static const int kSize = 1 << kShift;
+  static const int kMask = 0xff;
+  typedef std::vector<Object**> BlockStore;
+  int size_;
+  Object*** blocks_;
+  BlockStore block_store_;
+  int indexed_handles_[LAST_INDEX+1];
+
+  DISALLOW_COPY_AND_ASSIGN(EternalHandles);
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBAL_HANDLES_H_