llvm dev - Mar 2014 - [LLVMdev] Capturing the assembler from MCJIT

Is there a way to capture the assembler when using MCJIT? I was 
searching the lists and this popped up:

http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-March/047873.html

However this is quite elaborate and I was wondering if there's not an 
easier way to do this..?!

The setup I am using:

     llvm::InitializeNativeTarget();
     InitializeNativeTargetAsmPrinter(); // MCJIT
     InitializeNativeTargetAsmParser(); // MCJIT

     Mod = llvm::ParseIRFile( INPUT_FILE , Err, llvm::getGlobalContext());

     Mod->setTargetTriple(llvm::sys::getProcessTriple());

     llvm::EngineBuilder engineBuilder(Mod);
     engineBuilder.setEngineKind(llvm::EngineKind::JIT);
engineBuilder.setOptLevel(llvm::CodeGenOpt::Aggressive);
     TheExecutionEngine = engineBuilder.setUseMCJIT(true).create(); // MCJIT

     targetMachine = engineBuilder.selectTarget();

     mainFunc = Mod->getFunction("main");

     llvm::FunctionPassManager *functionPassManager;

     llvm::PassRegistry &registry = *llvm::PassRegistry::getPassRegistry();
     initializeScalarOpts(registry);

     functionPassManager = new llvm::FunctionPassManager(Mod);
functionPassManager->add(llvm::createVerifierPass(llvm::PrintMessageAction));
targetMachine->addAnalysisPasses(*functionPassManager);
     functionPassManager->add(new 
llvm::TargetLibraryInfo(llvm::Triple(Mod->getTargetTriple())));
     functionPassManager->add(new llvm::DataLayout(Mod));
functionPassManager->add(llvm::createBasicAliasAnalysisPass());
     functionPassManager->add(llvm::createLICMPass());
     functionPassManager->add(llvm::createGVNPass());
functionPassManager->add(llvm::createPromoteMemoryToRegisterPass());
functionPassManager->add(llvm::createLoopVectorizePass());
functionPassManager->add(llvm::createEarlyCSEPass());
functionPassManager->add(llvm::createInstructionCombiningPass());
functionPassManager->add(llvm::createCFGSimplificationPass());

     functionPassManager->run(*mainFunc);

     TheExecutionEngine->finalizeObject();  // MCJIT

     void *fptr = TheExecutionEngine->getPointerToFunction( mainFunc );


Thanks,
Frank

Frank,

Perhaps someone more knowledgeable will shoot this approach down, but what
I do for this case is copy the module after running the function pass
manager and pass it through:

    const string extension =
fileName.substr(fileName.find_last_of(".") +
1);
    string errorInfo;
    tool_output_file output(fileName.c_str(), errorInfo, sys::fs::F_None);
    PassManager pm;
    formatted_raw_ostream fos(output.os());
    targetMachine->addPassesToEmitFile(pm, fos, extension == "s" ?
TargetMachine::CGFT_AssemblyFile : TargetMachine::CGFT_ObjectFile);
    pm.run(*module);

This code was basically taken from `llc` and I believe MCJIT does
essentially (exactly?) the same thing.

-Josh


On Fri, Mar 7, 2014 at 4:23 PM, Frank Winter <fwinter at jlab.org> wrote:
> Is there a way to capture the assembler when using MCJIT? I was searching
> the lists and this popped up:
>
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-March/047873.html
>
> However this is quite elaborate and I was wondering if there's not an
> easier way to do this..?!
>
> The setup I am using:
>
>     llvm::InitializeNativeTarget();
>     InitializeNativeTargetAsmPrinter(); // MCJIT
>     InitializeNativeTargetAsmParser(); // MCJIT
>
>     Mod = llvm::ParseIRFile( INPUT_FILE , Err, llvm::getGlobalContext());
>
>     Mod->setTargetTriple(llvm::sys::getProcessTriple());
>
>     llvm::EngineBuilder engineBuilder(Mod);
>     engineBuilder.setEngineKind(llvm::EngineKind::JIT);
> engineBuilder.setOptLevel(llvm::CodeGenOpt::Aggressive);
>     TheExecutionEngine = engineBuilder.setUseMCJIT(true).create(); //
> MCJIT
>
>     targetMachine = engineBuilder.selectTarget();
>
>     mainFunc = Mod->getFunction("main");
>
>     llvm::FunctionPassManager *functionPassManager;
>
>     llvm::PassRegistry &registry =
*llvm::PassRegistry::getPassRegistry();
>     initializeScalarOpts(registry);
>
>     functionPassManager = new llvm::FunctionPassManager(Mod);
> functionPassManager->add(llvm::createVerifierPass(llvm::
> PrintMessageAction));
> targetMachine->addAnalysisPasses(*functionPassManager);
>     functionPassManager->add(new llvm::TargetLibraryInfo(llvm::
> Triple(Mod->getTargetTriple())));
>     functionPassManager->add(new llvm::DataLayout(Mod));
> functionPassManager->add(llvm::createBasicAliasAnalysisPass());
>     functionPassManager->add(llvm::createLICMPass());
>     functionPassManager->add(llvm::createGVNPass());
> functionPassManager->add(llvm::createPromoteMemoryToRegisterPass());
> functionPassManager->add(llvm::createLoopVectorizePass());
> functionPassManager->add(llvm::createEarlyCSEPass());
> functionPassManager->add(llvm::createInstructionCombiningPass());
> functionPassManager->add(llvm::createCFGSimplificationPass());
>
>     functionPassManager->run(*mainFunc);
>
>     TheExecutionEngine->finalizeObject();  // MCJIT
>
>     void *fptr = TheExecutionEngine->getPointerToFunction( mainFunc );
>
>
> Thanks,
> Frank
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20140307/32dc0b0d/attachment.html>