Subj : Re: obtaining script line number when invoking C function
To   : netscape.public.mozilla.jseng
From : John Bandhauer <jband@netscape.com>
Date : Mon Jul 07 2003 11:37 am

Damian Slee wrote:
> Hi,
> is there any way to obtain the script line number when invoking a 'C' function, using the JSContext *variable?
> 
> 
> JSBool CScriptPort::log(JSContext *Context, JSObject *Object, uintN argc, jsval *argv, jsval *rval)
> {
>   int lineno = ...
> 
> 
> I can obtain the lineno with the error reporter, but thats only when an error occurs.
> 

Yes, there are functions in jsdbgapi.h that you can use to do 
this. Basically, you use JS_FrameIterator to get the JS stack 
frame in question for the given JSContext, JS_GetFramePC to get 
the opcode location in the executing frame, and JS_PCToLineNumber 
to convert this to a line number. There are additional functions 
that can get you the filename (or URL) etc.

There is an example of this sort of thing at:
http://lxr.mozilla.org/seamonkey/source/js/src/xpconnect/src/xpcdebug.cpp#262

John.

.