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List:       gdb
Subject:    Re: repeat command on return after issuing guile command
From:       David Boles <boles () ieee ! org>
Date:       2017-05-01 16:37:07
Message-ID: 1493656627.1159458.961959512.72D00241 () webmail ! messagingengine ! com
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My apologies - I never run gdb outside of Emacs and made the assumption
that an interaction between the gdb-mi.el code, guile, and command
repeating wasn't plausible.

The problem indeed does not occur with gdb itself, only when run from
within emacs.

I will go and investigate things from the Emacs side of things and try
to develop a patch for this behavior.

Thanks for setting me straight.

 - db

On Mon, May 1, 2017, at 06:20 AM, Matt Rice wrote:
> On Sun, Apr 30, 2017 at 12:03 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > > From: David Boles <boles@ieee.org>
> > > Date: Fri, 28 Apr 2017 22:50:18 -0500
> > > 
> > > I have recently been learning to use the guile mechanism for extending gdb's \
> > > capabilities - very powerful. One thing that I have noticed is that after a \
> > > "guile (…)" command is issued, the normal behavior of gdb re-performing the \
> > > last command executed if you just hit enter is disabled. This applies to even \
> > > native gdb commands like "next" or "step" - which is quite painful. 
> > > I have observed this with versions 7.10.x and 7.12.1.
> > 
> > I cannot reproduce this with GDB 7.12 built with Guile 2.0.X.  I tried
> > this:
> > 
> > (gdb) apropos file
> > ... long list of commands ...
> > (gdb) <press RET>
> > ... the same long list of commands ...
> > (gdb) guile (display (+ 20 3)) (newline)
> > 23
> > (gdb) apropos file
> > ... long list of commands ...
> > (gdb) <press RET>
> > ... the same long list of commands ...
> > 
> > So it seems to work as expected for me.  Can you show a recipe that
> > exhibits the problem on your system?
> 
> One thing that I can think of is if the guile script being executed
> causes the program to continue,
> which then hits a breakpoint which has "commands" associated with it,
> the call to prevent_dont_repeat in
> breakpoint.c (bpstat_do_actions_1), could have some clobbering effect
> messes with the repeat.
> 
> I cannot seem reproduce such behavior though
> 
> using the following foo.gdb:
> set breakpoint pending on
> break foo
> commands 1
> print "foo"
> end
> guile (use-modules (gdb))
> guile (execute "start")
> guile (execute "cont")
> 
> $ echo "void foo() {}; int main() { while (1) foo(); return 0; }" |
> gcc -g -x c - && gdb -quiet ./a.out -ex 'source foo.gdb'
> Reading symbols from ./a.out...done.
> Breakpoint 1 at 0x4004aa: file <stdin>, line 1.
> Breakpoint 1, foo () at <stdin>:1
> 1    in <stdin>
> $1 = "foo"
> (gdb) guile (execute "cont")
> Breakpoint 1, foo () at <stdin>:1
> 1    in <stdin>
> $2 = "foo"
> (gdb)
> Breakpoint 1, foo () at <stdin>:1
> 1    in <stdin>
> $3 = "foo"
> (gdb)


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