[llvm-dev] Accessing '__attribute__((noinstrument))' during lowering

[David Blaikie via llvm-dev]

Right - if the LLVM IR doesn't have the attribute, you'd have to make
whatever changes are needed to add it during Clang's IR generation.
(whether or not such changes are upstreamable - I don't know/have any
opinion on)

On Wed, Dec 21, 2016 at 1:48 AM Martin J. O'Riordan <
martin.oriordan at movidius.com> wrote:

> Thanks David,
>
>
>
> I have tried ‘MF.getFunction()->hasFnAttribute(Attribute::???)’, but it
> seems that the front-end ‘NoInstrumentFunction’ attribute is not
> propagated to the collection of LLVM IR attributes (no equivalent is in the
> ‘Attribute::AttrKind’ enum).  It is not obvious that there is another
> mechanism, and I suspect that there is not due to the separation between FE
> processing and LLVM IR.
>
>
>
> However, I think that I could add a new IR attribute to the TD file, and
> set it when emitting IR in the FE depending on the corresponding CLang ‘
> Decl’ attribute.
>
>
>
> All the best and thanks for the pointer,
>
>
>
>             MartinO
>
>
>
> *From:* David Blaikie [mailto:dblaikie at gmail.com]
> *Sent:* 20 December 2016 16:27
> *To:* Martin J. O'Riordan; LLVM Developers
> *Subject:* Re: [llvm-dev] Accessing '__attribute__((noinstrument))'
> during lowering
>
>
>
> I imagine you can get the llvm::Function from the MachineFunction, and the
> attribute will be there (on the llvm::Function), but can't say I know much
> about it.
>
>
>
> On Tue, Dec 20, 2016 at 2:04 AM Martin J. O'Riordan via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Is it possible to find whether a function has the ‘noinstrument’
> attribute during Target lowering?  I would like to check if this is present
> on a function quite late in the process when I am performing normal Target
> lowering and Target Frame lowering actions, but I can’t find the
> appropriate query in the ‘MachineFunction’ or ‘MachineFunctionInfo’
> interfaces.
>
>
>
> Thanks,
>
>
>
>             MartinO
>
>
>
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