Re: gdb doc

Re: gdb doc

[A Soare]

> > I do not find in documentation how can I set a condition for gdb to stop to a breakpoint in Feval when such a condition is accomplished:
> > 
> > 1. lisp function name that is evaluated is "+".
> 
> Compare the car of the Feval's argument with Qplus.


I tried t

(gdb) br Feval
Breakpoint 3 at 0x8152849: file eval.c, line 2205.o do so:
(gdb) r
Starting program: /mnt/gnu/emacs/src/emacs -geometry 80x40+0+0
[Thread debugging using libthread_db enabled]
[New Thread -1208109376 (LWP 2650)]
[Switching to Thread -1208109376 (LWP 2650)]
Breakpoint 4 at 0x80c88e6: file xterm.c, line 7859.

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
  end
  continue
end

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

Re: gdb doc

[A Soare]

> > I do not find in documentation how can I set a condition for gdb to stop to a breakpoint in Feval when such a condition is accomplished:
> > 
> > 1. lisp function name that is evaluated is "+".
> 
> Compare the car of the Feval's argument with Qplus.


I tried t

(gdb) br Feval
Breakpoint 3 at 0x8152849: file eval.c, line 2205.o do so:
(gdb) r
Starting program: /mnt/gnu/emacs/src/emacs -geometry 80x40+0+0
[Thread debugging using libthread_db enabled]
[New Thread -1208109376 (LWP 2650)]
[Switching to Thread -1208109376 (LWP 2650)]
Breakpoint 4 at 0x80c88e6: file xterm.c, line 7859.

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
  end
  continue
end

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



Finally I got it alone...

Alin Soare

Re: gdb doc

[Eli Zaretskii]

> From: A Soare <alinsoar@voila.fr>
> Cc: "Emacs   Dev  [emacs-devel]" <emacs-devel@gnu.org>,
> 	"Emacs   Help  [help-gnu-emacs]" <help-gnu-emacs@gnu.org>
> 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

Re: gdb doc

[A Soare]

 > 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


Thanks a lot.


Alin Soare.