[LLVMdev] runtime pass

[Stephen Thomas]

Marwa,

By "runtime", are you referring to the runtime of opt? If so, I assume your
question is about how to make sure certain passes run before your pass
runs, so that their results are available to your pass. The "Writing an
LLVM Pass" doc has a nice section on the interaction between passes:

http://llvm.org/docs/WritingAnLLVMPass.html#specifying-interactions-between-passes

Alternatively, if by "runtime", you are referring to the runtime of the
application under analysis, then that's trickier. LLVM is designed to run
analysis and transformation passes at compilation time, not runtime. So it
depends on what you're trying to do. If you're trying to profile the
application to, e.g., gather values of certain variables, that's certainly
possible by first writing a transformation pass that instruments the IR
with calls at certain points in the target application.

Cheers,
Steve



On Wed, Jul 15, 2015 at 10:05 AM, marwayusuf at feng.bu.edu.eg <
marwayusuf at feng.bu.edu.eg> wrote:

>  Dear All
>
> I need to create a pass that is triggered to run at a specific point
> during runtime. Also, this pass needs to have access to object file and to
> be able to modify the original IR. Any idea how to make such pass?
>
>
>   Regards,
> Marwa Yusuf
> Teaching Assistant - Computer Engineering Department
> Faculty of Engineering - Benha University
> E-JUST PhD Student
> Computer Science & Engineering Dept.
>
> _______________________________________________
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> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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