llvm dev - Dec 2016 - Accessing '__attribute__((noinstrument))' during lowering

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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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
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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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 <mailto: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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