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Re: gdb doc


From: Eli Zaretskii
Subject: Re: gdb doc
Date: Fri, 23 Mar 2007 15:04:02 +0200

> From: A Soare <address@hidden>
> Cc: "Emacs   Dev  [emacs-devel]" <address@hidden>,
>       "Emacs   Help  [help-gnu-emacs]" <address@hidden>
> Date: Thu, 22 Mar 2007 12:59:11 +0100 (CET)
> 
> Breakpoint 3, Feval (form=139269229) at eval.c:2205
> (gdb) p form
> $1 = 139269229
> (gdb) xcar form
> $2 = 0x8540b91
> 
> Now I wish to do 
> 
> (gdb) commands
> 
> and here I do not know how to write CONDITION in
> 
>   if <CONDITION>
>     break

No, you need to say "break Feval if <CONDITION>".

> Can you help me a little mode to write the condition please?

I don't have time to write and test a complete script, sorry.  You
will need to look in lisp.h for the definition of the XCAR macro, or
in src/.gdbinit for the definition of `xcar', and use the same
expressions in the condition.  Something like the following
(untested!):

  break Feval if ((struct Lisp_Cons *) ((gdb_use_union ? form.u.val : form & 
$valmask) | gdb_data_seg_bits))->car == Qplus




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