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Re: How to debug function that uses macros


From: Joe Riel
Subject: Re: How to debug function that uses macros
Date: Tue, 28 Feb 2017 22:53:46 -0800

On Sun, 26 Feb 2017 23:36:00 -0500
Stefan Monnier <address@hidden> wrote:

> > How do I debug, using edebug, a function that uses macros?
> > I want to step through the macro expansion.
> 
> Depends where the expanded code comes from.
> 
> If it comes from the macro call itself, then you'll want to add a debug
> declaration to the macro, to explain which parts of the macro's
> arguments are expressions.  Something like
> 
>     (defmacro foo (bar baz)
>       (declare (debug (symbolp form)))
>       ...)
> 
> If the expanded code you want to step through comes from the macro
> itself, then you can try to use edebug-` instead of the normal `, such
> as:
> 
>     (defmacro foo (bar baz)
>       (declare (debug (symbolp form)))
>       (edebug-\` (let ((,bar (something))) ,baz)))

I couldn't get that to do anything.
Do I evaluate the macro (here foo) normally,
then instrument the function that calls it?
I tried doing that, but nothing changes when stepping 
through the function that includes the macro call.

> 
> > The obvious way to do this is to first create the fully 
> > expanded function, then use edebug on that.  Maybe there
> > is a better way, but that should work.  But how do I 
> > create the fully expanded function?   Neither macroexpand
> > nor macroexpand-all do anything useful here that I can tell.
> > For example
> >
> >   (macroexpand-all '(my-function))
> >
> > just displays (my-function).  
> 
> Only if `my-function` is a function, in which case indeed there's
> nothing to expand.
> 
> 
>         Stefan
> 
> 



-- 
Joe Riel




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