[llvm-dev] Can I dump LLVM IR after each pass in Clang BackendUtil.cpp

[Zhengyang Liu via llvm-dev]

Dear llvm-dev,

I am trying to debug some passes , these passes are added to
legacy::PassManager(MPM) in Clang's lib/CodeGen/BackendUtil.cpp :


//******
void EmitAssemblyHelper::CreatePasses() {
//******
if (CodeGenOpts.MemSafety) {
//
// Add passes that record information about run-time checks.
//
MPM->add (createCommonMSCInfoPass());
MPM->add (createSAFECodeMSCInfoPass());
//******

Could I dump the output LLVM IR after each pass in PassManager MPM?

Best regards,
Zhengyang.
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[Zhengyang Liu via llvm-dev]

It solved my question, thank you.

Best regards,

Zhengyang.

---

From: Martin J. O'Riordan <martin....@movidius.com>
Sent: Sunday, June 12, 2016 9:01 PM
To: 'Zhengyang Liu'
Subject: RE: [llvm-dev] Can I dump LLVM IR after each pass in Clang BackendUtil.cpp

 

I think that:

   -mllvm -print-after-all

does that you need.  It is "very" verbose though and you might prefer to use:

   -mllvm -print-after=<selected-passes>

Use '-mllvm -help' or '-mllvm --help-hidden' to see all the options.

        MartinO

[John Criswell via llvm-dev]

On 6/12/16 8:11 AM, Zhengyang Liu via llvm-dev wrote:

It solved my question, thank you.

Alternatively, you can add a BitcodeWriter (or whatever it's called) pass.  This pass writes the bitcode out to a file.  As it is an LLVM pass, you can schedule it like any other pass.

Regards,

John Criswell

-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell