new feature for "backtrace" that cuts path to file (remain filename)

[asmwarrior]

This topic has discussed some months ago, see:

http://sourceware.org/ml/gdb-patches/2011-12/msg00207.html
and
http://sourceware.org/ml/gdb-patches/2011-08/msg00036.html

Consider Jan's suggestion, I think a modified version get_filename_display_from_sal() which use symtab_to_fullname looks like below:

/* See commentary in frame.h.  */

const char *
get_filename_display_from_sal (struct symtab_and_line *sal)
{
   const char *filename = sal->symtab->filename;
   const char *dirname = sal->symtab->dirname;
   size_t dlen = dirname ? strlen (dirname) : 0;

   if (filename == NULL)
     {
       return NULL;
     }
   else if (filename_display_string == filename_display_basename)
     {
       return lbasename (filename);
     }
   else if (filename_display_string == filename_display_without_comp_directory
&& dirname && dlen && dlen <= strlen (filename)
&& !filename_ncmp (filename, dirname, dlen))
     {
       const char *start = filename + dlen;
       const char *result = start;
       while (IS_DIR_SEPARATOR (*result))
     result++;

       if (IS_DIR_SEPARATOR (dirname[dlen - 1]))
     return result;
       else
     return result == start ? filename : result;
     }
   else if (filename_display_string == filename_display_full)
     {
        const char *fullname = symtab_to_fullname (sal->symtab);
        if (fullname!=NULL)
           return fullname;
        else
           return filename;
     }

   return filename;
}

BTW: It works fine under Windows mingw gdb, and I think showing a fullname in the backtrace has some good reasons, because the front end of gdb like (Codeblocks IDE) can quickly locate/navigate the source, but it may failed when bt command show some relative paths.


Zhang Yuanhui
ollydbg from codeblocks' forum