llvm dev - Sep 2014 - [LLVMdev] Custom pass that runs before EmitStartOfAsmFile()?

Hi all,

I'm trying to write a custom module-level pass that runs before
AsmPrinter::EmitStartOfAsmFile(), since I'd like to have some processed
information available once entering this function.

Looking through "Writing an LLVM pass" documentation, it's not
clear to me if this is possible. I've also tried putting the pass in
different orders (addPreISel, addIRPasses, and etc.). Am I missing something or
this is just not possible to do? Any help is appreciated.

Thanks,
Cheng-Chih


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Hi Cheng-Chih,

You can add custom passes right before code emit by implementing the
'addPreEmitPass()' function of your
target pass config.

An example of this can be found here:
  <http://llvm.org/docs/doxygen/html/XCoreTargetMachine_8cpp_source.html>
Greetings,

Jeroen Dobbelaere


From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Yang, Cheng-Chih
Sent: Tuesday, September 30, 2014 5:06 PM
To: llvmdev at cs.uiuc.edu
Subject: [LLVMdev] Custom pass that runs before EmitStartOfAsmFile()?

Hi all,

I'm trying to write a custom module-level pass that runs before
AsmPrinter::EmitStartOfAsmFile(), since I'd like to have some processed
information available once entering this function.

Looking through "Writing an LLVM pass" documentation, it's not
clear to me if this is possible. I've also tried putting the pass in
different orders (addPreISel, addIRPasses, and etc.). Am I missing something or
this is just not possible to do? Any help is appreciated.

Thanks,
Cheng-Chih


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Thanks Jeroen. Unfortunately that does not solve my problem. It still appears
that EmitStartOfAsmFile runs before that.

Thanks,
Cheng-Chih

From: Jeroen Dobbelaere [mailto:Jeroen.Dobbelaere at synopsys.com]
Sent: Tuesday, September 30, 2014 3:37 PM
To: Yang, Cheng-Chih; llvmdev at cs.uiuc.edu
Subject: RE: Custom pass that runs before EmitStartOfAsmFile()?

Hi Cheng-Chih,

You can add custom passes right before code emit by implementing the
'addPreEmitPass()' function of your
target pass config.

An example of this can be found here:
  <http://llvm.org/docs/doxygen/html/XCoreTargetMachine_8cpp_source.html>

Greetings,

Jeroen Dobbelaere


From: llvmdev-bounces at cs.uiuc.edu<mailto:llvmdev-bounces at
cs.uiuc.edu> [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Yang,
Cheng-Chih
Sent: Tuesday, September 30, 2014 5:06 PM
To: llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu>
Subject: [LLVMdev] Custom pass that runs before EmitStartOfAsmFile()?

Hi all,

I'm trying to write a custom module-level pass that runs before
AsmPrinter::EmitStartOfAsmFile(), since I'd like to have some processed
information available once entering this function.

Looking through "Writing an LLVM pass" documentation, it's not
clear to me if this is possible. I've also tried putting the pass in
different orders (addPreISel, addIRPasses, and etc.). Am I missing something or
this is just not possible to do? Any help is appreciated.

Thanks,
Cheng-Chih


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