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From: Roland McGrath <roland@redhat.com>
To: systemtap@sources.redhat.com
Subject: Re: [Bug translator/12536] New: sdt v>=2 argument parsing can't parse '4+4(%esp)'
In-Reply-To: roland at gnu dot org's message of  Thursday, 3 March 2011 01:26:57 +0000 <bug-12536-1110@http.sourceware.org/bugzilla/>
References: <bug-12536-1110@http.sourceware.org/bugzilla/>
Message-Id: <20110303013013.CB9A91806DA@magilla.sf.frob.com>
Date: Thu, 03 Mar 2011 01:30:00 -0000
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I filed this PR when I hit problems trying to develop a test case for the
new setjmp/longjmp probes.  The probe argument in glibc is not going to
change, so I think this needs to be fixed before a test case can pass for
i686.  I think I'll try to develop the full test suite case and get it
working on x86-64, where there won't be this problem because it doesn't
happen to come up in those probe arguments.

For reference, here is the program I was using when I filed that PR.


#include <stdio.h>
#include <setjmp.h>

struct env
{
  jmp_buf jmp;
};

struct env saved;

void __attribute__ ((noinline))
bar (struct env *env, int x)
{
  if (x == 0)
    siglongjmp (env->jmp, 1);
}

void __attribute__ ((noinline))
foo (void)
{
  if (sigsetjmp (saved.jmp, 1) == 0)
    {
      puts ("foo the first time");
      bar (&saved, 0);
    }
  else
    puts ("foo the second time");
}

int
main (void)
{
  foo ();
  return 0;
}