[llvm-dev] Remove obsolete debug info while garbage collecting

Alexey Lapshin via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 7 09:33:29 PDT 2019

24.09.2019 3:05, David Blaikie пишет:
> On Fri, Sep 20, 2019 at 1:41 PM Alexey Lapshin <a.v.lapshin at mail.ru 
> <mailto:a.v.lapshin at mail.ru>> wrote:
>     19.09.2019 4:24, David Blaikie пишет:
>>     On Wed, Sep 18, 2019 at 7:25 AM Alexey Lapshin
>>     <a.v.lapshin at mail.ru <mailto:a.v.lapshin at mail.ru>> wrote:
>>         Generally speaking, dsymutil does a very similar thing. It
>>         parses DWARF DIEs, analyzes relocations, scans through
>>         references and throws out unused DIEs. But it`s current
>>         interface does not allow to use it at link stage.
>>          I think it would be perfect to have a singular implementation.
>>          Though I did not analyze how easy or is it possible to reuse
>>         its code at the link stage, it looked like it needs a
>>         significant rework.
>>          Implementation from this proposal does removing of obsolete
>>         debug info at link stage.
>>          And so has benefits of already loaded object files, already
>>         created liveness information,
>>          generating an optimized binary from scratch.
>>         If dsymutil could be refactored in such manner that could be
>>         used at the link stage, then it`s implementation could be
>>         reused. I would research the possibility of such a refactoring.
>>     Yeah, if this is going to be implemented, I think that would be
>>     strongly preferred - though I realize it may be substantial work
>>     to refactor. The alternative - duplicating all this work -
>>     doesn't seem like something that would be good for the LLVM project.
>     I see. So I would research the question of whether it is possible
>     to refactor it accordingly.
It looks like I have a prototype of that refactoring.  Next I am going 
to create a patch from it.

Thank you, Alexey.

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