//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This is the llc code generator driver. It provides a convenient // command-line interface for generating native assembly-language code // or C code, given LLVM bitcode. // //===----------------------------------------------------------------------===// #include "llvm/ADT/Triple.h" #include "llvm/CodeGen/CommandFlags.h" #include "llvm/CodeGen/LinkAllAsmWriterComponents.h" #include "llvm/CodeGen/LinkAllCodegenComponents.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/IRPrintingPasses.h" #include "llvm/IR/LLVMContext.h" #include "llvm/IR/Module.h" #include "llvm/IRReader/IRReader.h" #include "llvm/MC/SubtargetFeature.h" #include "llvm/Pass.h" #include "llvm/PassManager.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/Debug.h" #include "llvm/Support/FormattedStream.h" #include "llvm/Support/Host.h" #include "llvm/Support/ManagedStatic.h" #include "llvm/Support/PluginLoader.h" #include "llvm/Support/PrettyStackTrace.h" #include "llvm/Support/Signals.h" #include "llvm/Support/SourceMgr.h" #include "llvm/Support/TargetRegistry.h" #include "llvm/Support/TargetSelect.h" #include "llvm/Support/ToolOutputFile.h" #include "llvm/Target/TargetLibraryInfo.h" #include "llvm/Target/TargetMachine.h" #include using namespace llvm; // General options for llc. Other pass-specific options are specified // within the corresponding llc passes, and target-specific options // and back-end code generation options are specified with the target machine. // static cl::opt InputFilename(cl::Positional, cl::desc(""), cl::init("-")); static cl::opt OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); static cl::opt TimeCompilations("time-compilations", cl::Hidden, cl::init(1u), cl::value_desc("N"), cl::desc("Repeat compilation N times for timing")); static cl::opt NoIntegratedAssembler("no-integrated-as", cl::Hidden, cl::desc("Disable integrated assembler")); // Determine optimization level. static cl::opt OptLevel("O", cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " "(default = '-O2')"), cl::Prefix, cl::ZeroOrMore, cl::init(' ')); static cl::opt TargetTriple("mtriple", cl::desc("Override target triple for module")); cl::opt NoVerify("disable-verify", cl::Hidden, cl::desc("Do not verify input module")); cl::opt DisableSimplifyLibCalls("disable-simplify-libcalls", cl::desc("Disable simplify-libcalls"), cl::init(false)); static int compileModule(char**, LLVMContext&); // GetFileNameRoot - Helper function to get the basename of a filename. static inline std::string GetFileNameRoot(const std::string &InputFilename) { std::string IFN = InputFilename; std::string outputFilename; int Len = IFN.length(); if ((Len > 2) && IFN[Len-3] == '.' && ((IFN[Len-2] == 'b' && IFN[Len-1] == 'c') || (IFN[Len-2] == 'l' && IFN[Len-1] == 'l'))) { outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/ } else { outputFilename = IFN; } return outputFilename; } static tool_output_file *GetOutputStream(const char *TargetName, Triple::OSType OS, const char *ProgName) { // If we don't yet have an output filename, make one. if (OutputFilename.empty()) { if (InputFilename == "-") OutputFilename = "-"; else { OutputFilename = GetFileNameRoot(InputFilename); switch (FileType) { case TargetMachine::CGFT_AssemblyFile: if (TargetName[0] == 'c') { if (TargetName[1] == 0) OutputFilename += ".cbe.c"; else if (TargetName[1] == 'p' && TargetName[2] == 'p') OutputFilename += ".cpp"; else OutputFilename += ".s"; } else OutputFilename += ".s"; break; case TargetMachine::CGFT_ObjectFile: if (OS == Triple::Win32) OutputFilename += ".obj"; else OutputFilename += ".o"; break; case TargetMachine::CGFT_Null: OutputFilename += ".null"; break; } } } // Decide if we need "binary" output. bool Binary = false; switch (FileType) { case TargetMachine::CGFT_AssemblyFile: break; case TargetMachine::CGFT_ObjectFile: case TargetMachine::CGFT_Null: Binary = true; break; } // Open the file. std::string error; sys::fs::OpenFlags OpenFlags = sys::fs::F_None; if (!Binary) OpenFlags |= sys::fs::F_Text; tool_output_file *FDOut = new tool_output_file(OutputFilename.c_str(), error, OpenFlags); if (!error.empty()) { errs() << error << '\n'; delete FDOut; return nullptr; } return FDOut; } // main - Entry point for the llc compiler. // int main(int argc, char **argv) { sys::PrintStackTraceOnErrorSignal(); PrettyStackTraceProgram X(argc, argv); // Enable debug stream buffering. EnableDebugBuffering = true; LLVMContext &Context = getGlobalContext(); llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. // Initialize targets first, so that --version shows registered targets. InitializeAllTargets(); InitializeAllTargetMCs(); InitializeAllAsmPrinters(); InitializeAllAsmParsers(); // Initialize codegen and IR passes used by llc so that the -print-after, // -print-before, and -stop-after options work. PassRegistry *Registry = PassRegistry::getPassRegistry(); initializeCore(*Registry); initializeCodeGen(*Registry); initializeLoopStrengthReducePass(*Registry); initializeLowerIntrinsicsPass(*Registry); initializeUnreachableBlockElimPass(*Registry); // Register the target printer for --version. cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion); cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); // Compile the module TimeCompilations times to give better compile time // metrics. for (unsigned I = TimeCompilations; I; --I) if (int RetVal = compileModule(argv, Context)) return RetVal; return 0; } static int compileModule(char **argv, LLVMContext &Context) { // Load the module to be compiled... SMDiagnostic Err; std::unique_ptr M; Module *mod = nullptr; Triple TheTriple; bool SkipModule = MCPU == "help" || (!MAttrs.empty() && MAttrs.front() == "help"); // If user asked for the 'native' CPU, autodetect here. If autodection fails, // this will set the CPU to an empty string which tells the target to // pick a basic default. if (MCPU == "native") MCPU = sys::getHostCPUName(); // If user just wants to list available options, skip module loading if (!SkipModule) { M.reset(ParseIRFile(InputFilename, Err, Context)); mod = M.get(); if (mod == nullptr) { Err.print(argv[0], errs()); return 1; } // If we are supposed to override the target triple, do so now. if (!TargetTriple.empty()) mod->setTargetTriple(Triple::normalize(TargetTriple)); TheTriple = Triple(mod->getTargetTriple()); } else { TheTriple = Triple(Triple::normalize(TargetTriple)); } if (TheTriple.getTriple().empty()) TheTriple.setTriple(sys::getDefaultTargetTriple()); // Get the target specific parser. std::string Error; const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple, Error); if (!TheTarget) { errs() << argv[0] << ": " << Error; return 1; } // Package up features to be passed to target/subtarget std::string FeaturesStr; if (MAttrs.size()) { SubtargetFeatures Features; for (unsigned i = 0; i != MAttrs.size(); ++i) Features.AddFeature(MAttrs[i]); FeaturesStr = Features.getString(); } CodeGenOpt::Level OLvl = CodeGenOpt::Default; switch (OptLevel) { default: errs() << argv[0] << ": 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 Options = InitTargetOptionsFromCodeGenFlags(); Options.DisableIntegratedAS = NoIntegratedAssembler; std::unique_ptr target( TheTarget->createTargetMachine(TheTriple.getTriple(), MCPU, FeaturesStr, Options, RelocModel, CMModel, OLvl)); assert(target.get() && "Could not allocate target machine!"); assert(mod && "Should have exited after outputting help!"); TargetMachine &Target = *target.get(); if (DisableCFI) Target.setMCUseCFI(false); if (EnableDwarfDirectory) Target.setMCUseDwarfDirectory(true); if (GenerateSoftFloatCalls) FloatABIForCalls = FloatABI::Soft; // Figure out where we are going to send the output. std::unique_ptr Out( GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0])); if (!Out) return 1; // Build up all of the passes that we want to do to the module. PassManager PM; // Add an appropriate TargetLibraryInfo pass for the module's triple. TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple); if (DisableSimplifyLibCalls) TLI->disableAllFunctions(); PM.add(TLI); // Add the target data from the target machine, if it exists, or the module. if (const DataLayout *DL = Target.getDataLayout()) mod->setDataLayout(DL); PM.add(new DataLayoutPass(mod)); // Override default to generate verbose assembly. Target.setAsmVerbosityDefault(true); if (RelaxAll) { if (FileType != TargetMachine::CGFT_ObjectFile) errs() << argv[0] << ": warning: ignoring -mc-relax-all because filetype != obj"; else Target.setMCRelaxAll(true); } { formatted_raw_ostream FOS(Out->os()); AnalysisID StartAfterID = nullptr; AnalysisID StopAfterID = nullptr; const PassRegistry *PR = PassRegistry::getPassRegistry(); if (!StartAfter.empty()) { const PassInfo *PI = PR->getPassInfo(StartAfter); if (!PI) { errs() << argv[0] << ": start-after pass is not registered.\n"; return 1; } StartAfterID = PI->getTypeInfo(); } if (!StopAfter.empty()) { const PassInfo *PI = PR->getPassInfo(StopAfter); if (!PI) { errs() << argv[0] << ": stop-after pass is not registered.\n"; return 1; } StopAfterID = PI->getTypeInfo(); } // Ask the target to add backend passes as necessary. if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify, StartAfterID, StopAfterID)) { errs() << argv[0] << ": target does not support generation of this" << " file type!\n"; return 1; } // Before executing passes, print the final values of the LLVM options. cl::PrintOptionValues(); PM.run(*mod); } // Declare success. Out->keep(); return 0; }