Re: DWARF question

[Jim Blandy <jimb@codesourcery.com>]

Carlos Eduardo Seo <cseo at linux.vnet.ibm.com> writes:
> Jim Blandy wrote:
>> The real question here is, why isn't find_line_symtab doing its job?
>> Its comment says:
>>
>>   /* Find line number LINE in any symtab whose name is the same as
>>      SYMTAB.
>>
>>      If found, return the symtab that contains the linetable in which
> it was
>>      found, set *INDEX to the index in the linetable of the best entry
>>      found, and set *EXACT_MATCH nonzero if the value returned is an
>>      exact match.
>>
>>      If not found, return NULL.  */
>>
>> That sounds to me like it's meant to address exactly the case we have
>> here.  Could you take a look and tell us what you find?
>>
> Good point Jim. I'll take a look at that. The only thing I noticed in
> that function is that best_index always returns -1 when I try to set a
> breakpoint by line number in that function. I'm going deeper into that
> now.
>
> One point I forgot to mention and I think it's relevant is that when I
> load the binary with option '-readnow', that breakpoint by line number
> in the function works.

What probably happens is that '-readnow' somehow affects the order in
which the full symtabs get put in the list.  I'm surprised that
breakpoints by line number in both main and the function work, but I
guess that has something to do with the nature of the bug in
find_line_symtab.