Re: [PATCH] gdb/linespec.c: Fix missing source file during breakpoint re-set

[Bruno Larsen <blarsen@redhat.com>]

On 08/10/2022 01:44, Aaron Merey via Gdb-patches wrote:
> During breakpoint re-setting, the source_filename of an
> explicit_location_spec is used to lookup the symtabs associated with
> the breakpoint being re-set.  This source_filename is compared with each
> known symtab filename in order to retrieve the breakpoint's symtabs.
>
> However the source_filename may have been originally copied from a
> symtab's fullname (the path where GDB found the source file) when the
> breakpoint was first created.  If a breakpoint symtab's filename and
> fullname differ, this will cause a NOT_FOUND_ERROR to be thrown during
> re-setting.
>
> Fix this by using a symtab's filename to set the explicit_location_spec
> source_filename instead of the symtab's fullname.

This seems like a good change, and introduces no regressions.

Reviewed-By: Bruno Larsen <blarsen@redhat.com>


Cheers,
Bruno

> ---
>   gdb/linespec.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/gdb/linespec.c b/gdb/linespec.c
> index 3db35998f7e..805c98ca201 100644
> --- a/gdb/linespec.c
> +++ b/gdb/linespec.c
> @@ -2281,13 +2281,13 @@ convert_linespec_to_sals (struct linespec_state *state, linespec *ls)
>   	/* Make sure we have a filename for canonicalization.  */
>   	if (ls->explicit_loc.source_filename == NULL)
>   	  {
> -	    const char *fullname = symtab_to_fullname (state->default_symtab);
> +	    const char *filename = state->default_symtab->filename;
>   
>   	    /* It may be more appropriate to keep DEFAULT_SYMTAB in its symtab
>   	       form so that displaying SOURCE_FILENAME can follow the current
>   	       FILENAME_DISPLAY_STRING setting.  But as it is used only rarely
>   	       it has been kept for code simplicity only in absolute form.  */
> -	    ls->explicit_loc.source_filename = xstrdup (fullname);
> +	    ls->explicit_loc.source_filename = xstrdup (filename);
>   	  }
>       }
>     else