X64 implementation: Add arguments object to context when needed.

src/x64/codegen-x64.h

 // Copyright 2009 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 255 matching lines @@
   // A control destination in case the expression has a control-flow
   // effect.
   ControlDestination* destination_;
 
   // The previous state of the owning code generator, restored when
   // this state is destroyed.
   CodeGenState* previous_;
 };
 
 
+// -------------------------------------------------------------------------
+// Arguments allocation mode
+
+enum ArgumentsAllocationMode {
+  NO_ARGUMENTS_ALLOCATION,
+  EAGER_ARGUMENTS_ALLOCATION,
+  LAZY_ARGUMENTS_ALLOCATION
+};
 
 
 // -------------------------------------------------------------------------
 // CodeGenerator
 
 class CodeGenerator: public AstVisitor {
  public:
   // Takes a function literal, generates code for it. This function should only
   // be called by compiler.cc.
   static Handle<Code> MakeCode(FunctionLiteral* fun,
@@ skipping 90 matching lines @@
   void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
 
   // Main code generation function
   void GenCode(FunctionLiteral* fun);
 
   // Generate the return sequence code.  Should be called no more than
   // once per compiled function, immediately after binding the return
   // target (which can not be done more than once).
   void GenerateReturnSequence(Result* return_value);
 
+  // Returns the arguments allocation mode.
+  ArgumentsAllocationMode ArgumentsMode() const;
+
+  // Store the arguments object and allocate it if necessary.
+  Result StoreArgumentsObject(bool initial);
+
   // The following are used by class Reference.
   void LoadReference(Reference* ref);
   void UnloadReference(Reference* ref);
 
   Operand ContextOperand(Register context, int index) const {
     return Operand(context, Context::SlotOffset(index));
   }
 
   Operand SlotOperand(Slot* slot, Register tmp);
 
@@ skipping 239 matching lines @@
   friend class Reference;
   friend class Result;
 
   DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODEGEN_X64_H_