//===-- 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/LLVMContext.h" #include "llvm/Module.h" #include "llvm/ModuleProvider.h" #include "llvm/PassManager.h" #include "llvm/Pass.h" #include "llvm/ADT/Triple.h" #include "llvm/Analysis/Verifier.h" #include "llvm/Bitcode/ReaderWriter.h" #include "llvm/CodeGen/FileWriters.h" #include "llvm/CodeGen/LinkAllAsmWriterComponents.h" #include "llvm/CodeGen/LinkAllCodegenComponents.h" #include "llvm/CodeGen/ObjectCodeEmitter.h" #include "llvm/Config/config.h" #include "llvm/LinkAllVMCore.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/FileUtilities.h" #include "llvm/Support/FormattedStream.h" #include "llvm/Support/ManagedStatic.h" #include "llvm/Support/MemoryBuffer.h" #include "llvm/Support/PluginLoader.h" #include "llvm/Support/PrettyStackTrace.h" #include "llvm/System/Host.h" #include "llvm/System/Signals.h" #include "llvm/Target/SubtargetFeature.h" #include "llvm/Target/TargetData.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetRegistry.h" #include "llvm/Target/TargetSelect.h" #include "llvm/Transforms/Scalar.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 Force("f", cl::desc("Overwrite output files")); // 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")); static cl::opt MArch("march", cl::desc("Architecture to generate code for (see --version)")); static cl::opt MCPU("mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"), cl::value_desc("cpu-name"), cl::init("")); static cl::list MAttrs("mattr", cl::CommaSeparated, cl::desc("Target specific attributes (-mattr=help for details)"), cl::value_desc("a1,+a2,-a3,...")); cl::opt FileType("filetype", cl::init(TargetMachine::AssemblyFile), cl::desc("Choose a file type (not all types are supported by all targets):"), cl::values( clEnumValN(TargetMachine::AssemblyFile, "asm", "Emit an assembly ('.s') file"), clEnumValN(TargetMachine::ObjectFile, "obj", "Emit a native object ('.o') file [experimental]"), clEnumValN(TargetMachine::DynamicLibrary, "dynlib", "Emit a native dynamic library ('.so') file" " [experimental]"), clEnumValEnd)); cl::opt NoVerify("disable-verify", cl::Hidden, cl::desc("Do not verify input module")); static cl::opt DisableRedZone("disable-red-zone", cl::desc("Do not emit code that uses the red zone."), cl::init(false)); static cl::opt NoImplicitFloats("no-implicit-float", cl::desc("Don't generate implicit floating point instructions (x86-only)"), cl::init(false)); // 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') { outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/ } else { outputFilename = IFN; } return outputFilename; } static formatted_raw_ostream *GetOutputStream(const char *TargetName, const char *ProgName) { if (OutputFilename != "") { if (OutputFilename == "-") return &fouts(); // Make sure that the Out file gets unlinked from the disk if we get a // SIGINT sys::RemoveFileOnSignal(sys::Path(OutputFilename)); std::string error; raw_fd_ostream *FDOut = new raw_fd_ostream(OutputFilename.c_str(), error, (Force ? raw_fd_ostream::F_Force : 0)| raw_fd_ostream::F_Binary); if (!error.empty()) { errs() << error << '\n'; if (!Force) errs() << "Use -f command line argument to force output\n"; delete FDOut; return 0; } formatted_raw_ostream *Out = new formatted_raw_ostream(*FDOut, formatted_raw_ostream::DELETE_STREAM); return Out; } if (InputFilename == "-") { OutputFilename = "-"; return &fouts(); } OutputFilename = GetFileNameRoot(InputFilename); bool Binary = false; switch (FileType) { case TargetMachine::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::ObjectFile: OutputFilename += ".o"; Binary = true; break; case TargetMachine::DynamicLibrary: OutputFilename += LTDL_SHLIB_EXT; Binary = true; break; } // Make sure that the Out file gets unlinked from the disk if we get a // SIGINT sys::RemoveFileOnSignal(sys::Path(OutputFilename)); std::string error; unsigned OpenFlags = 0; if (Force) OpenFlags |= raw_fd_ostream::F_Force; if (Binary) OpenFlags |= raw_fd_ostream::F_Binary; raw_fd_ostream *FDOut = new raw_fd_ostream(OutputFilename.c_str(), error, OpenFlags); if (!error.empty()) { errs() << error << '\n'; if (!Force) errs() << "Use -f command line argument to force output\n"; delete FDOut; return 0; } formatted_raw_ostream *Out = new formatted_raw_ostream(*FDOut, formatted_raw_ostream::DELETE_STREAM); return Out; } // main - Entry point for the llc compiler. // int main(int argc, char **argv) { sys::PrintStackTraceOnErrorSignal(); PrettyStackTraceProgram X(argc, argv); LLVMContext &Context = getGlobalContext(); llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. // Initialize targets first. InitializeAllTargets(); InitializeAllAsmPrinters(); cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); // Load the module to be compiled... std::string ErrorMessage; std::auto_ptr M; std::auto_ptr Buffer( MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)); if (Buffer.get()) M.reset(ParseBitcodeFile(Buffer.get(), Context, &ErrorMessage)); if (M.get() == 0) { errs() << argv[0] << ": bitcode didn't read correctly.\n"; errs() << "Reason: " << ErrorMessage << "\n"; return 1; } Module &mod = *M.get(); // If we are supposed to override the target triple, do so now. if (!TargetTriple.empty()) mod.setTargetTriple(TargetTriple); Triple TheTriple(mod.getTargetTriple()); if (TheTriple.getTriple().empty()) TheTriple.setTriple(sys::getHostTriple()); // Allocate target machine. First, check whether the user has explicitly // specified an architecture to compile for. If so we have to look it up by // name, because it might be a backend that has no mapping to a target triple. const Target *TheTarget = 0; if (!MArch.empty()) { for (TargetRegistry::iterator it = TargetRegistry::begin(), ie = TargetRegistry::end(); it != ie; ++it) { if (MArch == it->getName()) { TheTarget = &*it; break; } } if (!TheTarget) { errs() << argv[0] << ": error: invalid target '" << MArch << "'.\n"; return 1; } // Adjust the triple to match (if known), otherwise stick with the // module/host triple. Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch); if (Type != Triple::UnknownArch) TheTriple.setArch(Type); } else { std::string Err; TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Err); if (TheTarget == 0) { errs() << argv[0] << ": error auto-selecting target for module '" << Err << "'. Please use the -march option to explicitly " << "pick a target.\n"; return 1; } } // Package up features to be passed to target/subtarget std::string FeaturesStr; if (MCPU.size() || MAttrs.size()) { SubtargetFeatures Features; Features.setCPU(MCPU); for (unsigned i = 0; i != MAttrs.size(); ++i) Features.AddFeature(MAttrs[i]); FeaturesStr = Features.getString(); } std::auto_ptr target(TheTarget->createTargetMachine(TheTriple.getTriple(), FeaturesStr)); assert(target.get() && "Could not allocate target machine!"); TargetMachine &Target = *target.get(); // Figure out where we are going to send the output... formatted_raw_ostream *Out = GetOutputStream(TheTarget->getName(), argv[0]); if (Out == 0) return 1; 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': case '2': OLvl = CodeGenOpt::Default; break; case '3': OLvl = CodeGenOpt::Aggressive; break; } // If this target requires addPassesToEmitWholeFile, do it now. This is // used by strange things like the C backend. if (Target.WantsWholeFile()) { PassManager PM; // Add the target data from the target machine, if it exists, or the module. if (const TargetData *TD = Target.getTargetData()) PM.add(new TargetData(*TD)); else PM.add(new TargetData(&mod)); if (!NoVerify) PM.add(createVerifierPass()); // Ask the target to add backend passes as necessary. if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, OLvl)) { errs() << argv[0] << ": target does not support generation of this" << " file type!\n"; if (Out != &fouts()) delete Out; // And the Out file is empty and useless, so remove it now. sys::Path(OutputFilename).eraseFromDisk(); return 1; } PM.run(mod); } else { // Build up all of the passes that we want to do to the module. ExistingModuleProvider Provider(M.release()); FunctionPassManager Passes(&Provider); // Add the target data from the target machine, if it exists, or the module. if (const TargetData *TD = Target.getTargetData()) Passes.add(new TargetData(*TD)); else Passes.add(new TargetData(&mod)); #ifndef NDEBUG if (!NoVerify) Passes.add(createVerifierPass()); #endif // Ask the target to add backend passes as necessary. ObjectCodeEmitter *OCE = 0; // Override default to generate verbose assembly. Target.setAsmVerbosityDefault(true); switch (Target.addPassesToEmitFile(Passes, *Out, FileType, OLvl)) { default: assert(0 && "Invalid file model!"); return 1; case FileModel::Error: errs() << argv[0] << ": target does not support generation of this" << " file type!\n"; if (Out != &fouts()) delete Out; // And the Out file is empty and useless, so remove it now. sys::Path(OutputFilename).eraseFromDisk(); return 1; case FileModel::AsmFile: break; case FileModel::MachOFile: OCE = AddMachOWriter(Passes, *Out, Target); break; case FileModel::ElfFile: OCE = AddELFWriter(Passes, *Out, Target); break; } if (Target.addPassesToEmitFileFinish(Passes, OCE, OLvl)) { errs() << argv[0] << ": target does not support generation of this" << " file type!\n"; if (Out != &fouts()) delete Out; // And the Out file is empty and useless, so remove it now. sys::Path(OutputFilename).eraseFromDisk(); return 1; } Passes.doInitialization(); // Run our queue of passes all at once now, efficiently. // TODO: this could lazily stream functions out of the module. for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I) if (!I->isDeclaration()) { if (DisableRedZone) I->addFnAttr(Attribute::NoRedZone); if (NoImplicitFloats) I->addFnAttr(Attribute::NoImplicitFloat); Passes.run(*I); } Passes.doFinalization(); } Out->flush(); // Delete the ostream if it's not a stdout stream if (Out != &fouts()) delete Out; return 0; }