| //===-- 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/PassManager.h" |
| #include "llvm/Pass.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/Support/IRReader.h" |
| #include "llvm/CodeGen/LinkAllAsmWriterComponents.h" |
| #include "llvm/CodeGen/LinkAllCodegenComponents.h" |
| #include "llvm/MC/SubtargetFeature.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/FormattedStream.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/PluginLoader.h" |
| #include "llvm/Support/PrettyStackTrace.h" |
| #include "llvm/Support/ToolOutputFile.h" |
| #include "llvm/Support/Host.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Support/TargetSelect.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include <memory> |
| 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<std::string> |
| InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-")); |
| |
| static cl::opt<std::string> |
| OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); |
| |
| // Determine optimization level. |
| static cl::opt<char> |
| OptLevel("O", |
| cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " |
| "(default = '-O2')"), |
| cl::Prefix, |
| cl::ZeroOrMore, |
| cl::init(' ')); |
| |
| static cl::opt<std::string> |
| TargetTriple("mtriple", cl::desc("Override target triple for module")); |
| |
| static cl::opt<std::string> |
| MArch("march", cl::desc("Architecture to generate code for (see --version)")); |
| |
| static cl::opt<std::string> |
| MCPU("mcpu", |
| cl::desc("Target a specific cpu type (-mcpu=help for details)"), |
| cl::value_desc("cpu-name"), |
| cl::init("")); |
| |
| static cl::list<std::string> |
| MAttrs("mattr", |
| cl::CommaSeparated, |
| cl::desc("Target specific attributes (-mattr=help for details)"), |
| cl::value_desc("a1,+a2,-a3,...")); |
| |
| static cl::opt<Reloc::Model> |
| RelocModel("relocation-model", |
| cl::desc("Choose relocation model"), |
| cl::init(Reloc::Default), |
| cl::values( |
| clEnumValN(Reloc::Default, "default", |
| "Target default relocation model"), |
| clEnumValN(Reloc::Static, "static", |
| "Non-relocatable code"), |
| clEnumValN(Reloc::PIC_, "pic", |
| "Fully relocatable, position independent code"), |
| clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", |
| "Relocatable external references, non-relocatable code"), |
| clEnumValEnd)); |
| |
| static cl::opt<llvm::CodeModel::Model> |
| CMModel("code-model", |
| cl::desc("Choose code model"), |
| cl::init(CodeModel::Default), |
| cl::values(clEnumValN(CodeModel::Default, "default", |
| "Target default code model"), |
| clEnumValN(CodeModel::Small, "small", |
| "Small code model"), |
| clEnumValN(CodeModel::Kernel, "kernel", |
| "Kernel code model"), |
| clEnumValN(CodeModel::Medium, "medium", |
| "Medium code model"), |
| clEnumValN(CodeModel::Large, "large", |
| "Large code model"), |
| clEnumValEnd)); |
| |
| static cl::opt<bool> |
| RelaxAll("mc-relax-all", |
| cl::desc("When used with filetype=obj, " |
| "relax all fixups in the emitted object file")); |
| |
| cl::opt<TargetMachine::CodeGenFileType> |
| FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile), |
| cl::desc("Choose a file type (not all types are supported by all targets):"), |
| cl::values( |
| clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm", |
| "Emit an assembly ('.s') file"), |
| clEnumValN(TargetMachine::CGFT_ObjectFile, "obj", |
| "Emit a native object ('.o') file [experimental]"), |
| clEnumValN(TargetMachine::CGFT_Null, "null", |
| "Emit nothing, for performance testing"), |
| clEnumValEnd)); |
| |
| cl::opt<bool> NoVerify("disable-verify", cl::Hidden, |
| cl::desc("Do not verify input module")); |
| |
| cl::opt<bool> DisableDotLoc("disable-dot-loc", cl::Hidden, |
| cl::desc("Do not use .loc entries")); |
| |
| cl::opt<bool> DisableCFI("disable-cfi", cl::Hidden, |
| cl::desc("Do not use .cfi_* directives")); |
| |
| cl::opt<bool> EnableDwarfDirectory("enable-dwarf-directory", cl::Hidden, |
| cl::desc("Use .file directives with an explicit directory.")); |
| |
| static cl::opt<bool> |
| DisableRedZone("disable-red-zone", |
| cl::desc("Do not emit code that uses the red zone."), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableFPMAD("enable-fp-mad", |
| cl::desc("Enable less precise MAD instructions to be generated"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| PrintCode("print-machineinstrs", |
| cl::desc("Print generated machine code"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| DisableFPElim("disable-fp-elim", |
| cl::desc("Disable frame pointer elimination optimization"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| DisableFPElimNonLeaf("disable-non-leaf-fp-elim", |
| cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| DisableExcessPrecision("disable-excess-fp-precision", |
| cl::desc("Disable optimizations that may increase FP precision"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableUnsafeFPMath("enable-unsafe-fp-math", |
| cl::desc("Enable optimizations that may decrease FP precision"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableNoInfsFPMath("enable-no-infs-fp-math", |
| cl::desc("Enable FP math optimizations that assume no +-Infs"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableNoNaNsFPMath("enable-no-nans-fp-math", |
| cl::desc("Enable FP math optimizations that assume no NaNs"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math", |
| cl::Hidden, |
| cl::desc("Force codegen to assume rounding mode can change dynamically"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| GenerateSoftFloatCalls("soft-float", |
| cl::desc("Generate software floating point library calls"), |
| cl::init(false)); |
| |
| static cl::opt<llvm::FloatABI::ABIType> |
| FloatABIForCalls("float-abi", |
| cl::desc("Choose float ABI type"), |
| cl::init(FloatABI::Default), |
| cl::values( |
| clEnumValN(FloatABI::Default, "default", |
| "Target default float ABI type"), |
| clEnumValN(FloatABI::Soft, "soft", |
| "Soft float ABI (implied by -soft-float)"), |
| clEnumValN(FloatABI::Hard, "hard", |
| "Hard float ABI (uses FP registers)"), |
| clEnumValEnd)); |
| |
| static cl::opt<bool> |
| DontPlaceZerosInBSS("nozero-initialized-in-bss", |
| cl::desc("Don't place zero-initialized symbols into bss section"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableJITExceptionHandling("jit-enable-eh", |
| cl::desc("Emit exception handling information"), |
| cl::init(false)); |
| |
| // In debug builds, make this default to true. |
| #ifdef NDEBUG |
| #define EMIT_DEBUG false |
| #else |
| #define EMIT_DEBUG true |
| #endif |
| static cl::opt<bool> |
| EmitJitDebugInfo("jit-emit-debug", |
| cl::desc("Emit debug information to debugger"), |
| cl::init(EMIT_DEBUG)); |
| #undef EMIT_DEBUG |
| |
| static cl::opt<bool> |
| EmitJitDebugInfoToDisk("jit-emit-debug-to-disk", |
| cl::Hidden, |
| cl::desc("Emit debug info objfiles to disk"), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| EnableGuaranteedTailCallOpt("tailcallopt", |
| cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."), |
| cl::init(false)); |
| |
| static cl::opt<bool> |
| DisableTailCalls("disable-tail-calls", |
| cl::desc("Never emit tail calls"), |
| cl::init(false)); |
| |
| static cl::opt<unsigned> |
| OverrideStackAlignment("stack-alignment", |
| cl::desc("Override default stack alignment"), |
| cl::init(0)); |
| |
| static cl::opt<bool> |
| EnableRealignStack("realign-stack", |
| cl::desc("Realign stack if needed"), |
| cl::init(true)); |
| |
| static cl::opt<bool> |
| DisableSwitchTables(cl::Hidden, "disable-jump-tables", |
| cl::desc("Do not generate jump tables."), |
| cl::init(false)); |
| |
| static cl::opt<std::string> |
| TrapFuncName("trap-func", cl::Hidden, |
| cl::desc("Emit a call to trap function rather than a trap instruction"), |
| cl::init("")); |
| |
| static cl::opt<bool> |
| SegmentedStacks("segmented-stacks", |
| cl::desc("Use segmented stacks if possible."), |
| 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') || |
| (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; |
| unsigned OpenFlags = 0; |
| if (Binary) OpenFlags |= raw_fd_ostream::F_Binary; |
| tool_output_file *FDOut = new tool_output_file(OutputFilename.c_str(), error, |
| OpenFlags); |
| if (!error.empty()) { |
| errs() << error << '\n'; |
| delete FDOut; |
| return 0; |
| } |
| |
| 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(); |
| |
| // Register the target printer for --version. |
| cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion); |
| |
| cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); |
| |
| // Load the module to be compiled... |
| SMDiagnostic Err; |
| std::auto_ptr<Module> M; |
| |
| M.reset(ParseIRFile(InputFilename, Err, Context)); |
| if (M.get() == 0) { |
| Err.print(argv[0], errs()); |
| return 1; |
| } |
| Module &mod = *M.get(); |
| |
| // If we are supposed to override the target triple, do so now. |
| if (!TargetTriple.empty()) |
| mod.setTargetTriple(Triple::normalize(TargetTriple)); |
| |
| Triple TheTriple(mod.getTargetTriple()); |
| if (TheTriple.getTriple().empty()) |
| TheTriple.setTriple(sys::getDefaultTargetTriple()); |
| |
| // 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 (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; |
| Options.LessPreciseFPMADOption = EnableFPMAD; |
| Options.PrintMachineCode = PrintCode; |
| Options.NoFramePointerElim = DisableFPElim; |
| Options.NoFramePointerElimNonLeaf = DisableFPElimNonLeaf; |
| Options.NoExcessFPPrecision = DisableExcessPrecision; |
| Options.UnsafeFPMath = EnableUnsafeFPMath; |
| Options.NoInfsFPMath = EnableNoInfsFPMath; |
| Options.NoNaNsFPMath = EnableNoNaNsFPMath; |
| Options.HonorSignDependentRoundingFPMathOption = |
| EnableHonorSignDependentRoundingFPMath; |
| Options.UseSoftFloat = GenerateSoftFloatCalls; |
| if (FloatABIForCalls != FloatABI::Default) |
| Options.FloatABIType = FloatABIForCalls; |
| Options.NoZerosInBSS = DontPlaceZerosInBSS; |
| Options.JITExceptionHandling = EnableJITExceptionHandling; |
| Options.JITEmitDebugInfo = EmitJitDebugInfo; |
| Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk; |
| Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt; |
| Options.DisableTailCalls = DisableTailCalls; |
| Options.StackAlignmentOverride = OverrideStackAlignment; |
| Options.RealignStack = EnableRealignStack; |
| Options.DisableJumpTables = DisableSwitchTables; |
| Options.TrapFuncName = TrapFuncName; |
| Options.EnableSegmentedStacks = SegmentedStacks; |
| |
| std::auto_ptr<TargetMachine> |
| target(TheTarget->createTargetMachine(TheTriple.getTriple(), |
| MCPU, FeaturesStr, Options, |
| RelocModel, CMModel, OLvl)); |
| assert(target.get() && "Could not allocate target machine!"); |
| TargetMachine &Target = *target.get(); |
| |
| if (DisableDotLoc) |
| Target.setMCUseLoc(false); |
| |
| if (DisableCFI) |
| Target.setMCUseCFI(false); |
| |
| if (EnableDwarfDirectory) |
| Target.setMCUseDwarfDirectory(true); |
| |
| if (GenerateSoftFloatCalls) |
| FloatABIForCalls = FloatABI::Soft; |
| |
| // Disable .loc support for older OS X versions. |
| if (TheTriple.isMacOSX() && |
| TheTriple.isMacOSXVersionLT(10, 6)) |
| Target.setMCUseLoc(false); |
| |
| // Figure out where we are going to send the output... |
| OwningPtr<tool_output_file> 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 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)); |
| |
| // 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()); |
| |
| // Ask the target to add backend passes as necessary. |
| if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify)) { |
| 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; |
| } |