Re: dwarf2_build_psymtabs should check that .debug_line exists

[Jim Blandy <jimb@redhat.com>]

This looks good to me.

Andrew, I can't get a fresh copy of copyright.list; is David in there
yet?

David Carlton <carlton@math.stanford.edu> writes:

> In article <vt24rdyze50.fsf@zenia.red-bean.com>, Jim Blandy <jimb@zenia.red-bean.com> writes:
> 
> > It looks to me like read_file_scope shouldn't call dwarf_decode_macros
> > either when line_header is zero.  Could you add that to your patch,
> > and re-post it?
> 
> Oh, right, good call.  Here it is; no new regressions.
> 
> David Carlton
> carlton@math.stanford.edu
> 
> 2002-08-13  David Carlton  <carlton@math.stanford.edu>
> 
> 	* dwarf2read.c (dwarf2_build_psymtabs): Check that
> 	dwarf_line_offset is nonzero before creating dwarf_line_buffer.
> 	(read_file_scope): Check that line_header is nonzero before
> 	decoding macro information.
> 
> Index: dwarf2read.c
> ===================================================================
> RCS file: /cvs/src/src/gdb/dwarf2read.c,v
> retrieving revision 1.64
> diff -u -p -r1.64 dwarf2read.c
> --- dwarf2read.c	31 Jul 2002 22:35:30 -0000	1.64
> +++ dwarf2read.c	13 Aug 2002 21:30:02 -0000
> @@ -1009,9 +1009,13 @@ dwarf2_build_psymtabs (struct objfile *o
>    dwarf_abbrev_buffer = dwarf2_read_section (objfile,
>  					     dwarf_abbrev_offset,
>  					     dwarf_abbrev_size);
> -  dwarf_line_buffer = dwarf2_read_section (objfile,
> -					   dwarf_line_offset,
> -					   dwarf_line_size);
> +
> +  if (dwarf_line_offset)
> +    dwarf_line_buffer = dwarf2_read_section (objfile,
> +					     dwarf_line_offset,
> +					     dwarf_line_size);
> +  else
> +    dwarf_line_buffer = NULL;
>  
>    if (dwarf_str_offset)
>      dwarf_str_buffer = dwarf2_read_section (objfile,
> @@ -1808,7 +1812,7 @@ read_file_scope (struct die_info *die, s
>       header, so we can only read it if we've read the header
>       successfully.  */
>    attr = dwarf_attr (die, DW_AT_macro_info);
> -  if (attr)
> +  if (attr && line_header)
>      {
>        unsigned int macro_offset = DW_UNSND (attr);
>        dwarf_decode_macros (line_header, macro_offset,