Cache optimized code on shared function info.

src/deoptimizer.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 448 matching lines @@
 
 class TranslationIterator BASE_EMBEDDED {
  public:
   TranslationIterator(ByteArray* buffer, int index)
       : buffer_(buffer), index_(index) {
     ASSERT(index >= 0 && index < buffer->length());
   }
 
   int32_t Next();
 
-  bool HasNext() const { return index_ >= 0; }
+  bool HasNext() const { return index_ < buffer_->length(); }
 
-  void Done() { index_ = -1; }
+  void Done() { index_ = buffer_->length(); }
 
   void Skip(int n) {
     for (int i = 0; i < n; i++) Next();
   }
 
+  void Undo() {
+    ASSERT(index_ > 0);
+    index_--;
+  }
+
  private:
   ByteArray* buffer_;
   int index_;
 };
 
 
 class Translation BASE_EMBEDDED {
  public:
   enum Opcode {
     BEGIN,
@@ skipping 32 matching lines @@
   void StoreLiteral(int literal_id);
   void StoreArgumentsObject();
   void MarkDuplicate();
 
   static int NumberOfOperandsFor(Opcode opcode);
 
 #ifdef OBJECT_PRINT
   static const char* StringFor(Opcode opcode);
 #endif
 
+  // A literal id which refers to the JSFunction itself.
+  static const int kSelfLiteralId = -239;
+
  private:
   TranslationBuffer* buffer_;
   int index_;
 };
 
 
 // Linked list holding deoptimizing code objects. The deoptimizing code objects
 // are kept as weak handles until they are no longer activated on the stack.
 class DeoptimizingCodeListNode : public Malloced {
  public:
@@ skipping 81 matching lines @@
 
   static SlotRef ComputeSlotForNextArgument(TranslationIterator* iterator,
                                             DeoptimizationInputData* data,
                                             JavaScriptFrame* frame);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEOPTIMIZER_H_