Scott McPeak wrote:
>
> I'm working on a project in which some very long (millions of lines) C
> source files get generated. Since GNU 'as' and 'gdb' cannot store more
> than 16 bits of line number information, debugging programs using these
> files is tedious.
>
> The reason for the 16-bit limit is the n_desc field of the stabs symbol is
> 16 bits (see http://www.kashpureff.org/nic/linux/texinfo/stabs_6.html).
>
> As a stopgap, I've hacked 'as' and 'gdb' to put bits 16-23 into the
> n_other field, which I understand is usually zero anyway (but
> gdb-5.2/include/bout.h suggests that sometimes it's not, at least on some
> architectures). Below are patches to each package (binutils-2.12 and
> gdb-5.2) which accomplish the hack.
Have you tried using -gdwarf-2?
>
> -Scott
>
> ------------------------------------- 8< -------------------------
> --- binutils-2.12/gas/stabs.c.orig Thu May 2 23:36:03 2002
> +++ binutils-2.12/gas/stabs.c Fri May 3 00:03:57 2002
> @@ -251,6 +251,20 @@
> input_line_pointer++;
> SKIP_WHITESPACE ();
> }
> +
> + /* handle descriptions (line numbers!) which are >0xFFFF */
> + if (desc > 0xFFFF)
> + {
> + if (desc > 0xFFFFFF)
> + as_warn(_("desc is too large to encode in 24 bits: %d"), desc);
> + else if (other != 0)
> + as_warn(_("I want to use 'other', but it is not zero: %d"), other);
> + else
> + /* stick the extra bits in 'other' because it is typically unused;
> + * of course, downstream tools (like gdb) need to be modified to
> + * use this information */
> + other = desc >> 16;
> + }
>
> #ifdef TC_PPC
> #ifdef OBJ_ELF
> --- gdb-5.2/gdb/dbxread.c.orig Thu May 2 23:21:09 2002
> +++ gdb-5.2/gdb/dbxread.c Thu May 2 23:31:43 2002
> @@ -970,6 +970,7 @@
> (intern).n_value = bfd_h_get_signed_32 (abfd, (extern)->e_value); \
> else \
> (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \
> + (intern).n_other = bfd_h_get_8 (abfd, (extern)->e_other); \
> }
>
> /* Invariant: The symbol pointed to by symbuf_idx is the first one
> @@ -2599,8 +2600,10 @@
>
> if (type & N_STAB)
> {
> - process_one_symbol (type, nlist.n_desc, nlist.n_value,
> - namestring, section_offsets, objfile);
> + /* to handle line numbers larger than 0xFFFF, add the 'other'
> + * field to n_desc (after shifting by 16 bits) */
> + process_one_symbol (type, nlist.n_desc + (nlist.n_other << 16),
> + nlist.n_value, namestring, section_offsets, objfile);
> }
> /* We skip checking for a new .o or -l file; that should never
> happen in this routine. */
>
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