[llvm-dev] Stop bugpoint from removing operand of metadata.

[Hongbin Zheng via llvm-dev]

On Fri, Aug 19, 2016 at 10:32 AM, Mehdi Amini <mehdi.amini at apple.com> wrote:

> Hi,
>
>
> On Aug 19, 2016, at 10:24 AM, Hongbin Zheng via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Hi,
>
> I am trying to use bugpoint to reduce testcase. And bugpoint try to reduce
> the number of operands for metadata, and this generate corrupted metadata:
>
> *** Attempting to remove named metadata: Checking for crash with only
> these named metadata nodes: llvm.dbg.cu llvm.module.flags llvm.ident:
> <crash>
> Checking for crash with only these named metadata nodes: llvm.module.flags
> llvm.ident: <crash>
> Checking for crash with only these named metadata nodes: llvm.ident:
> Checking for crash with only these named metadata nodes:
> llvm.module.flags: <crash>
> Checking for crash with only 3 named metadata operands: <crash>
> Checking for crash with only 2 named metadata operands: All DICompileUnits
> must be listed in llvm.dbg.cu
> LLVM ERROR: Broken module found, compilation aborted!
>
>
> I had the same issue, and have some local patches to help with this.
> Have you tried the   -disable-namedmd-remove option?
>
Yep, that contains too much metadata :)


>
> Also, at this point where bug point crashes, it should already have dumped
> a module.
>
Thanks for pointing this out. let me check


>
> —
> Mehdi
>
>
>
>
> This crash bugpoint itself. Is there away to prevent bugpoint from doing
> this rather than changing the source code of bugpoint?
>
> I tried to run a "bugpoint --help-hidden" and get the following options
> related to metadata:
>     -lowertypetests                                        - Lower type
> metadata
>   -disable-namedmd-remove                                  - Do not remove
> global named metadata
>   -enable-import-metadata                                  - Enable import
> metadata like 'thinlto_src_module'
>   -enable-noalias-to-md-conversion                         - Convert
> noalias attributes to metadata during inlining.
>   -lto-strip-invalid-debug-info                            - Strip invalid
> debug info metadata during LTO instead of aborting.
>
> And I don't think these help.
>
> Any suggestion?
>
> Thanks
> Hongbin
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>
>
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