arguments is a live reference to the arguments on the call stack, so function f(a) { g(); alert([a, arguments[0]]) } function g() { f.arguments[0] = "foo"; } f("bar"); will produce foo, foo Isn't ES a marvelous language? :D caller and callee aren't writable though. --Oliver On Sep 21, 2010, at 11:37 AM, Holger Freyther wrote:

On 09/22/2010 02:09 AM, Oliver Hunt wrote:

...

In the general case this would require being able to convert from inlined code to a 'correct' call stack at some arbitrary point

argh, I had hoped that such things would be only necessary when we have a debugger attached. This mean besides what maciej had said, we will need to remember that this range of instructions belongs to a inlined call and be able to generate the virtual call record.

Can one write to arguments, callee and such?

I wonder (and will try to measure based on sunspider and other test content) how many functions occur like function f(x) { return x +2; } or even fully constant. Is there any classification of the complexity of functions at parse time?