Dead code elimination must not delete HArgumentsObject

src/hydrogen-instructions.h

 // Copyright 2012 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 3215 matching lines @@
   }
 
   DECLARE_CONCRETE_INSTRUCTION(ArgumentsObject)
 
  protected:
   virtual void InternalSetOperandAt(int index, HValue* value) {
     values_[index] = value;
   }
 
  private:
-  virtual bool IsDeletable() const { return true; }
+  virtual bool IsDeletable() const { return false; }

[Sven Panne, 2013/06/16 13:33:55]

DBC: Just remove the whole line, 'false' is the (safe) default, anyway...

 
   ZoneList<HValue*> values_;
 };
 
 
 class HConstant: public HTemplateInstruction<0> {
  public:
   HConstant(Handle<Object> handle, Representation r = Representation::None());
   HConstant(int32_t value,
             Representation r = Representation::None(),
@@ skipping 3361 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_