[llvm-dev] Help with pass manager

[Lorenzo Laneve via llvm-dev]

The stack trace:
llvm::PMTopLevelManager::addImmutablePass(llvm::ImmutablePass*)
llvm::PMTopLevelManager::schedulePass(llvm::Pass*)
moduleToObjectFile(llvm::Module*,std::string&,llvm::LLVMContext&)

Sometimes it doesn't crash because TargetRegistry::lookupTarget() returns an error which says it doesn't support the current target

> On Mar 24, 2016, at 1:14 AM, Mehdi Amini <mehdi.amini at apple.com> wrote:
> 
> Assuming you are talking about this line:
> 
> passmanager.add(tliwp);
> 
> I don't see anything obviously wrong. 
> Are you hitting an assertion or a pure crash? (if LLVM not built with assertions, please rebuild).
> What does your debugger gives you as a stracktrace?
> 
> -- 
> Mehdi
> 
> 
> 
>> On Mar 23, 2016, at 3:44 PM, Lorenzo Laneve via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>> 
>> Sorry in advance for the stupid question, i still don’t understand some concepts like passes.
>> I took a piece of code from llc, and I used it to write a function that creates an object (or assembly) file from an IR module.
>> It compiles without any problems. But program crashes when it reaches add() method of the pass manager.
>> Can you help me figuring out what’s the problem please? here is my function
>> 
>> 
>> int moduleToObjectFile(llvm::Module *module, std::string &srcname, llvm::LLVMContext &Context) {
>>     SMDiagnostic error;
>>     Triple moduletriple = Triple(module->getTargetTriple());
>>     
>>     if (moduletriple.getTriple().empty())
>>         moduletriple.setTriple(sys::getDefaultTargetTriple());
>>     
>>     std::string lookuperror;
>>     const Target *moduletarget = TargetRegistry::lookupTarget(MArch, moduletriple, lookuperror);
>>     
>>     if (!moduletarget) {
>>         errs() << lookuperror;
>>         return 1;
>>     }
>>     
>>     std::string cpuname = getCPUStr(),
>>                 ftrlist = getFeaturesStr();
>>     
>>     CodeGenOpt::Level OLvl = CodeGenOpt::Default;
>>     switch ('2') {
>>         default:
>>             errs() << "invalid optimization level.\n";
>>             return 1;
>>         case ' ': break;
>>         case '0': OLvl = CodeGenOpt::None; break;
>>         case '1': OLvl = CodeGenOpt::Less; break;
>>         case '2': OLvl = CodeGenOpt::Default; break;
>>         case '3': OLvl = CodeGenOpt::Aggressive; break;
>>     }
>>     
>>     TargetOptions targetopts = InitTargetOptionsFromCodeGenFlags();
>>     
>>     std::unique_ptr<TargetMachine> tmachine(moduletarget->createTargetMachine(moduletriple.getTriple(), cpuname, ftrlist, targetopts, Reloc::Default, CodeModel::Default, OLvl));
>>     
>>     assert(tmachine && "Could not allocate target machine!");
>>     
>>     assert(module && "Should have exited if we didn't have a module!");
>>     if (FloatABIForCalls != FloatABI::Default)
>>         targetopts.FloatABIType = FloatABIForCalls;
>>     
>>     
>>     std::unique_ptr<tool_output_file> objoutstream = getOutputFileStream(module, srcname);
>>     if (!objoutstream) return 1;
>>     
>>     legacy::PassManager passmanager;
>>     
>>     TargetLibraryInfoImpl TLII(moduletriple);
>>     
>>     TargetLibraryInfoWrapperPass *tliwp = new TargetLibraryInfoWrapperPass(TLII);
>>     
>>     passmanager.add(tliwp);
>>     
>>     module->setDataLayout(tmachine->createDataLayout());
>>     
>>     setFunctionAttributes(cpuname, ftrlist, *module);
>>     
>>     if (RelaxAll.getNumOccurrences() > 0 &&
>>         FileType != TargetMachine::CGFT_ObjectFile)
>>         errs() << "warning: ignoring -mc-relax-all because filetype != obj";
>>     
>>     {
>>         raw_pwrite_stream *outstream = &objoutstream->os();
>>         
>>         SmallVector<char, 0> filebuf;
>>         std::unique_ptr<raw_svector_ostream> BOS;
>>         if ((FileType != TargetMachine::CGFT_AssemblyFile && !objoutstream->os().supportsSeeking())) {
>>             BOS = make_unique<raw_svector_ostream>(filebuf);
>>             outstream = BOS.get();
>>         }
>>         
>>         AnalysisID StartBeforeID = nullptr;
>>         AnalysisID StartAfterID = nullptr;
>>         AnalysisID StopAfterID = nullptr;
>>         const PassRegistry *PR = PassRegistry::getPassRegistry();
>>         if (!RunPass.empty()) {
>>             if (!StartAfter.empty() || !StopAfter.empty()) {
>>                 errs() << "start-after and/or stop-after passes are redundant when run-pass is specified.\n";
>>                 return 1;
>>             }
>>             const PassInfo *PI = PR->getPassInfo(RunPass);
>>             if (!PI) {
>>                 errs() << "run-pass pass is not registered.\n";
>>                 return 1;
>>             }
>>             StopAfterID = StartBeforeID = PI->getTypeInfo();
>>         } else {
>>             if (!StartAfter.empty()) {
>>                 const PassInfo *PI = PR->getPassInfo(StartAfter);
>>                 if (!PI) {
>>                     errs() << "start-after pass is not registered.\n";
>>                     return 1;
>>                 }
>>                 StartAfterID = PI->getTypeInfo();
>>             }
>>             if (!StopAfter.empty()) {
>>                 const PassInfo *PI = PR->getPassInfo(StopAfter);
>>                 if (!PI) {
>>                     errs() << "stop-after pass is not registered.\n";
>>                     return 1;
>>                 }
>>                 StopAfterID = PI->getTypeInfo();
>>             }
>>         }
>>         
>>         if (tmachine->addPassesToEmitFile(passmanager, *outstream, FileType, false, StartBeforeID, StartAfterID, StopAfterID)) {
>>             errs() << "target does not support generation of this file type!\n";
>>             return 1;
>>         }
>>         
>>         passmanager.run(*module);
>>         
>>         if (BOS) {
>>             objoutstream->os() << filebuf;
>>         }
>>     }
>>     
>>     objoutstream->keep();
>>     
>>     return 0;
>> }
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> 
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