[llvm-dev] Can DISubprogram be renamed?

Sergei Larin via llvm-dev llvm-dev at lists.llvm.org
Fri Apr 15 10:56:06 PDT 2016

Will that take care of creating a properly named debug scope?


(“Properly” in this context == named after cloned destination…)



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From: Peter Collingbourne [mailto:peter at pcc.me.uk] 
Sent: Friday, April 15, 2016 12:03 PM
To: Sergei Larin <slarin at codeaurora.org>; aprantl at apple.com
Cc: Teresa Johnson <tejohnson at google.com>; llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: Can DISubprogram be renamed?


I'd actually like to remove that functionality, as it is unused. See http://reviews.llvm.org/D18628


Adrian's change r266446 I think obsoletes that patch or at least makes it a lot simpler.




On Fri, Apr 15, 2016 at 9:50 AM, Sergei Larin <slarin at codeaurora.org <mailto:slarin at codeaurora.org> > wrote:




  I am afraid I am missing a big picture with debug info cloning.


  Certainly after your patch (and possibly in some cases earlier):


    Cloning: Reduce complexity of debug info cloning and fix correctness issue.


    Commit r260791 contained an error in that it would introduce a cross-module

    reference in the old module. It also introduced O(N^2) complexity in the

    module cloner by requiring the entire module to be visited for each function.

    Fix both of these problems by avoiding use of the CloneDebugInfoMetadata

    function (which is only designed to do intra-module cloning) and cloning

    function-attached metadata in the same way that we clone all other metadata.


    Differential Revision: http://reviews.llvm.org/D18583


During CloneFunctionInto we seem to create a new DISubprogram which still carries the name of the _original_ function… which creates certain confusion with debugging scope.


Was it designed that way, or am I missing something here… 


Thanks a lot.







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