Re: [PATCH,DWARF,v2] AIX dwarf2out label fix

[David Edelsohn <dje.gcc@gmail.com>]

On Thu, Jun 1, 2017 at 3:03 PM, Jason Merrill <jason@redhat.com> wrote:
> On 05/18/2017 06:00 AM, David Edelsohn wrote:
>>
>> This version adds a macro DWARF_INITIAL_LENGTH_SIZE_STR based on
>> DWARF_OFFSET_SIZE to define the string expression to append to the
>> label to correct the offset.
>>
>> Because AIX Assembler inserts the section length, the section label
>> generated by GCC points to the wrong location and must be adjusted
>> when referenced in DW_AT_stmt_list.
>>
>> +  char dl_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
>
> It seems inaccurate to call this variable "label" when it's a label name
> minus offset.  Maybe dl_section_ref?

Hi, Jason

Thanks for taking a look at this!

Any naming suggestions are appreciated -- I was trying to choose a
short variable name.  dl_section_ref is fine with me.

>
>>         if (debug_info_level >= DINFO_LEVEL_TERSE)
>>           add_AT_lineptr (ctnode->root_die, DW_AT_stmt_list,
>>                           (!dwarf_split_debug_info
>> -                         ? debug_line_section_label
>> +                         ? dl_section_label
>>                            : debug_skeleton_line_section_label));
>
>
> Doesn't debug_skeleton_line_section_label need the same offset?

AIX doesn't support DWARF split debug info, so it did not seem
worthwhile to clutter the code.  I am trying to make the minimal
changes for AIX's peculiar DWARF implementation.

Thanks, David