Always iterate outgoing arguments as a part of caller frame.

src/frames.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 445 matching lines @@
 class JavaScriptFrame: public StandardFrame {
  public:
   virtual Type type() const { return JAVA_SCRIPT; }
 
   // Accessors.
   inline Object* function() const;
   inline Object* receiver() const;
   inline void set_receiver(Object* value);
 
   // Access the parameters.
-  Object* GetParameter(int index) const;
-  int ComputeParametersCount() const;
+  inline Address GetParameterSlot(int index) const;
+  inline Object* GetParameter(int index) const;
+  inline int ComputeParametersCount() const {
+    return GetNumberOfIncomingArguments();
+  }
 
   // Check if this frame is a constructor frame invoked through 'new'.
   bool IsConstructor() const;
 
   // Check if this frame has "adapted" arguments in the sense that the
   // actual passed arguments are available in an arguments adaptor
   // frame below it on the stack.
   inline bool has_adapted_arguments() const;
 
   // Garbage collection support.
@@ skipping 17 matching lines @@
     ASSERT(frame->is_java_script());
     return static_cast<JavaScriptFrame*>(frame);
   }
 
  protected:
   explicit JavaScriptFrame(StackFrameIterator* iterator)
       : StandardFrame(iterator) { }
 
   virtual Address GetCallerStackPointer() const;
 
+  virtual int GetNumberOfIncomingArguments() const;
+
   // Garbage collection support. Iterates over incoming arguments,
   // receiver, and any callee-saved registers.
   void IterateArguments(ObjectVisitor* v) const;
 
  private:
   inline Object* function_slot_object() const;
 
   friend class StackFrameIterator;
   friend class StackTracer;
 };
@@ skipping 40 matching lines @@
   }
 
   // Printing support.
   virtual void Print(StringStream* accumulator,
                      PrintMode mode,
                      int index) const;
  protected:
   explicit ArgumentsAdaptorFrame(StackFrameIterator* iterator)
       : JavaScriptFrame(iterator) { }
 
+  virtual int GetNumberOfIncomingArguments() const {
+     return Smi::cast(GetExpression(0))->value();

[fschneider, 2011/04/06 14:06:55]

Too much indentation.

+  }
+
   virtual Address GetCallerStackPointer() const;
 
  private:
   friend class StackFrameIterator;
 };
 
 
 class InternalFrame: public StandardFrame {
  public:
   virtual Type type() const { return INTERNAL; }
@@ skipping 270 matching lines @@
 };
 
 
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap();
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_H_