Backtrace library?

Backtrace library?

[John Yates]

Assuming I have an elf image compiled with full debugging information is there any library I can use to get a gdb-style backtrace with sourc path and line number rather than the C library's rather Spartan version?

/john

Re: Backtrace library?

[Paul Pluzhnikov]

On Thu, Aug 20, 2009 at 1:27 PM, John Yates<jyates@netezza.com> wrote:

> Assuming I have an elf image compiled with full debugging information
> is there any library I can use to get a gdb-style backtrace with sourc
> path and line number rather than the C library's rather Spartan version?

I am not aware of any such library, but you can pipe the "spartan" output
through addr2line and get desired result.

Cheers,
-- 
Paul Pluzhnikov

Re: Backtrace library?

[paawan oza]

I think backtrace function of glibc internally use unwind library interface to get backtrace.
unwind library interface may be used.

I am not sure exactly how gdb reads stack (just walk through esp/ebp or some other way)

Regards,
Oza.

--- On Fri, 8/21/09, John Yates <jyates@netezza.com> wrote:

> From: John Yates <jyates@netezza.com>
> Subject: Backtrace library?
> To: "gdb@sourceware.org" <gdb@sourceware.org>
> Date: Friday, August 21, 2009, 1:57 AM
> Assuming I have an elf image compiled
> with full debugging information is there any library I can
> use to get a gdb-style backtrace with sourc path and line
> number rather than the C library's rather Spartan version?
> 
> /john
> 


      

Re: Backtrace library?

[Christophe-Marie Duquesne]

Hello,

Maybe I'm arriving a bit late, but yesterday, I saw there was a C
library libbacktrace which is supposed to replicate gdb's backtrace. I
found it by chance while browsing the archlinux users repository :
http://aur.archlinux.org/packages.php?ID=24369

This may help...
-- 
Christophe-Marie Duquesne

RE: Backtrace library?

[John Yates]

Christophe-Marie Duquesne writes:

> I saw there was a C library libbacktrace which is supposed
> to replicate gdb's backtrace. I found it by chance while
> browsing the archlinux users repository :
> http://aur.archlinux.org/packages.php?ID=24369

Thanks for the suggestion.  Sadly this only maintains a stack in which code compiled with function entry and exit macros can explicitly push and pop file/lineno/function triples.  It does not decode the contents of the image.

/john

Re: Backtrace library?

[Christophe-Marie Duquesne]

Not as good as it looked from the outside. I was wondering why nobody
had mentioned it :) Sorry!


-- 
Christophe-Marie Duquesne

RE: Backtrace library?

[Pierre Muller]

  You could probably try to use 
Eli's work called bfdsymify.c
  This is based on GNU bfd library,
but for DJGPP stack dumps written on
a Dos console.
  But it can also handle a stack trace 
stored in a file.
  The version I have came with GDB 6.1.1 for DJGPP
and BFD version is 2.15.90, but
it might be easy to update.

  The sources are available 

ftp://ftp.univie.ac.at/applications/djgpp/v2gnu/gdb611s.zip

  
  To compile it for DJGPP on current CVS HEAD
I had to change only a little,
patch is below.

  To use it on other platform you might need to remove
DJGPP specific stuff...

  Hope this can help you.


Pierre Muller
Pascal language support maintainer for GDB

PS: Eli, is this source in any CVS tree?


Pierre@d620-muller ~/gdbcvs/djbuild/bfdsymify
$ diff -up  ../../src/bfdsymify/bfdsymify.c bfdsymify.c
--- ../../src/bfdsymify/bfdsymify.c     2009-08-28 17:00:44.781250000 +0200
+++ bfdsymify.c 2009-08-28 17:27:08.812500000 +0200
@@ -393,7 +393,8 @@ find_address_in_section (bfd *bfdp, asec
   if (pc < vma)
     return;

-  size = bfd_get_section_size_before_reloc (section);
+//  size = bfd_get_section_size_before_reloc (section);
+  size = bfd_get_section_size (section);
   if (pc >= vma + size)
     return;

@@ -575,7 +576,8 @@ int main(int argc, char **argv)
        fputs(line, ofile);
        if (progname)
        {
-         char *arg_base = basename(progname), *prog_base =
basename(line+9);
+         char *arg_base = lbasename(progname);
+         char *prog_base = lbasename(line+9);
          if (strcasecmp(prog_base, arg_base)
              && strncasecmp(prog_base, arg_base, strlen(prog_base)-4))
            fprintf(stderr,
@@ -675,7 +677,7 @@ int main(int argc, char **argv)
       }
       if (progname)
       {
-       char *arg_base = basename(progname), *prog_base = basename(prog);
+       char *arg_base = lbasename(progname), *prog_base = lbasename(prog);

        if (strcasecmp(prog_base, arg_base)
            && (strncasecmp(prog_base, arg_base, strlen(prog_base)-4)

Re: Backtrace library?

[Eli Zaretskii]

> From: "Pierre Muller" <muller@ics.u-strasbg.fr>
> Cc: "'Eli Zaretskii'" <eliz@gnu.org>
> Date: Fri, 28 Aug 2009 17:35:19 +0200
> 
> PS: Eli, is this source in any CVS tree?

Not that I know of, no.