[LLVMdev] Is there a path from MachineInstr to the associated Instruction

[Qingan Li]

Hi John,

Thanks so much!
I have checked the BasicBlock. However, there may be multiple call sites in
one basic block, so it cannot guarantee correctness.
Finally, I chose to add the CallInst into VDNode during DAG construction,
and then add the CallInst into MachineInstr during instruction selection.

Thanks all the same!

Best regards,

Li Qingan

2014-11-17 1:44 GMT+08:00 John Criswell <jtcriswel at gmail.com>:

>  On 11/14/14, 6:53 AM, Qingan Li wrote:
>
>  Hi,
>
>  Recently, I am working on some information collection on the machine
> instruction (MachineInstr) level.
> But, sometimes, I need check the corresponding IR level instruction of the
> a machine instruction.
>
>  When visiting a machine instruction which is a call
> (MachineInstr::isCall()), I need to check the arguments of this call site.
> I know that the CallSite class provides good facility for this work, but
> the CallSite can be constructed only fromInstruction rather than
> MachineInstr.
>
>  Is there any workaround?
>
>
> If you're working on MachineInstr's, then you can probably examine the
> MachineIntr's operands to determine which function is being called.  This
> probably won't be target independent, but if you're working at the
> MachineInstr level, you're not doing target independent work, anyway.
>
> Alternatively, you should check to see if the MachineBasicBlock has a
> method to fetch the BasicBlock from which it was generated.  Using that,
> you could potentially scan the BasicBlock looking for a CallInst or
> InvokeInst that is likely to match the MachineInstr.
>
> Regards,
>
> John Criswell
>
>
>  Thanks.
>
>  --
> Best regards,
>
>  Li Qingan
>
>
> _______________________________________________
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>
>
>
> --
> John Criswell
> Assistant Professor
> Department of Computer Science, University of Rochesterhttp://www.cs.rochester.edu/u/criswell
>
>


-- 
Best regards,

Li Qingan
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