[rfc][patch] Refactoring how we handle symbols for the end of sections
rafael.espindola at gmail.com
Thu Mar 19 07:54:49 PDT 2015
On 13 March 2015 at 20:07, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
>> On 2015-Mar-11, at 13:55, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
>> I recently refactored how we handle creating symbols for the start of
>> sections. We were doing it in an ad-hoc way and producing .text files
>> that were harder to read (r231898 was the main change).
>> With the infrastructure in place, I am now looking at the symbol
>> pointing to the end of sections. They are not as common, but there are
>> some issues
>> * We can end up printing multiple symbols with the same purpose.
>> * We switch back to sections just to print them even when we could
>> have printed them earlier.
>> The second issues is particularly problematic with
>> -fno-unique-section-names, since trying to switch back to a section
>> marked with ", unique" actually creates a new one.
>> The attached WIP patch fixes the issue. I still have to clean up some
>> issues, like it changing the number of every .Ltmp* symbol, but for
>> now I would like some feedback on the direction.
>> Is the assembly output cleanup and unifying the end section symbol
>> sufficient to justify the patch? It should also make it easier to fix
>> the FIXME about subsections :-)
> Sounds like a nice cleanup to me, although I don't know this code
> well enough to confirm.
An updated patch is attached. It is on top of the patch in the "Don't
declare all text sections at the start of the .s" thread.
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