Improve performance of arguments object allocation by taking...

src/codegen.h

 // Copyright 2006-2008 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 324 matching lines @@
 
   void Generate(MacroAssembler* masm) { GenerateBody(masm, true); }
 
  private:
   int MinorKey() { return 1; }
 
   const char* GetName() { return "JSConstructEntryStub"; }
 };
 
 
+class ArgumentsAccessStub: public CodeStub {
+ public:
+  enum Type {
+    READ_LENGTH,
+    READ_ELEMENT,
+    NEW_OBJECT
+  };
+
+  explicit ArgumentsAccessStub(Type type) : type_(type) { }
+
+ private:
+  Type type_;
+
+  Major MajorKey() { return ArgumentsAccess; }
+  int MinorKey() { return type_; }
+  void Generate(MacroAssembler* masm);
+
+  const char* GetName() { return "ArgumentsAccessStub"; }
+
+#ifdef DEBUG
+  void Print() {
+    PrintF("ArgumentsAccessStub (type %d)\n", type_);
+  }
+#endif
+};
+
+
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_