llc.cpp revision 226584
1193323Sed//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===// 2193323Sed// 3193323Sed// The LLVM Compiler Infrastructure 4193323Sed// 5193323Sed// This file is distributed under the University of Illinois Open Source 6193323Sed// License. See LICENSE.TXT for details. 7193323Sed// 8193323Sed//===----------------------------------------------------------------------===// 9193323Sed// 10193323Sed// This is the llc code generator driver. It provides a convenient 11193323Sed// command-line interface for generating native assembly-language code 12193323Sed// or C code, given LLVM bitcode. 13193323Sed// 14193323Sed//===----------------------------------------------------------------------===// 15193323Sed 16195340Sed#include "llvm/LLVMContext.h" 17193323Sed#include "llvm/Module.h" 18193323Sed#include "llvm/PassManager.h" 19193323Sed#include "llvm/Pass.h" 20198090Srdivacky#include "llvm/ADT/Triple.h" 21198090Srdivacky#include "llvm/Support/IRReader.h" 22198090Srdivacky#include "llvm/CodeGen/LinkAllAsmWriterComponents.h" 23198090Srdivacky#include "llvm/CodeGen/LinkAllCodegenComponents.h" 24198090Srdivacky#include "llvm/Config/config.h" 25224133Sdim#include "llvm/MC/SubtargetFeature.h" 26193323Sed#include "llvm/Support/CommandLine.h" 27202375Srdivacky#include "llvm/Support/Debug.h" 28198090Srdivacky#include "llvm/Support/FormattedStream.h" 29193323Sed#include "llvm/Support/ManagedStatic.h" 30193323Sed#include "llvm/Support/PluginLoader.h" 31193323Sed#include "llvm/Support/PrettyStackTrace.h" 32218885Sdim#include "llvm/Support/ToolOutputFile.h" 33218885Sdim#include "llvm/Support/Host.h" 34218885Sdim#include "llvm/Support/Signals.h" 35226584Sdim#include "llvm/Support/TargetRegistry.h" 36226584Sdim#include "llvm/Support/TargetSelect.h" 37198090Srdivacky#include "llvm/Target/TargetData.h" 38198090Srdivacky#include "llvm/Target/TargetMachine.h" 39193323Sed#include <memory> 40193323Sedusing namespace llvm; 41193323Sed 42193323Sed// General options for llc. Other pass-specific options are specified 43193323Sed// within the corresponding llc passes, and target-specific options 44193323Sed// and back-end code generation options are specified with the target machine. 45193323Sed// 46193323Sedstatic cl::opt<std::string> 47193323SedInputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-")); 48193323Sed 49193323Sedstatic cl::opt<std::string> 50193323SedOutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); 51193323Sed 52193323Sed// Determine optimization level. 53193323Sedstatic cl::opt<char> 54193323SedOptLevel("O", 55193323Sed cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " 56193323Sed "(default = '-O2')"), 57193323Sed cl::Prefix, 58193323Sed cl::ZeroOrMore, 59193323Sed cl::init(' ')); 60193323Sed 61193323Sedstatic cl::opt<std::string> 62193323SedTargetTriple("mtriple", cl::desc("Override target triple for module")); 63193323Sed 64198090Srdivackystatic cl::opt<std::string> 65198090SrdivackyMArch("march", cl::desc("Architecture to generate code for (see --version)")); 66193323Sed 67193323Sedstatic cl::opt<std::string> 68193323SedMCPU("mcpu", 69193323Sed cl::desc("Target a specific cpu type (-mcpu=help for details)"), 70193323Sed cl::value_desc("cpu-name"), 71193323Sed cl::init("")); 72193323Sed 73193323Sedstatic cl::list<std::string> 74193323SedMAttrs("mattr", 75193323Sed cl::CommaSeparated, 76193323Sed cl::desc("Target specific attributes (-mattr=help for details)"), 77193323Sed cl::value_desc("a1,+a2,-a3,...")); 78193323Sed 79226584Sdimstatic cl::opt<Reloc::Model> 80226584SdimRelocModel("relocation-model", 81226584Sdim cl::desc("Choose relocation model"), 82226584Sdim cl::init(Reloc::Default), 83226584Sdim cl::values( 84226584Sdim clEnumValN(Reloc::Default, "default", 85226584Sdim "Target default relocation model"), 86226584Sdim clEnumValN(Reloc::Static, "static", 87226584Sdim "Non-relocatable code"), 88226584Sdim clEnumValN(Reloc::PIC_, "pic", 89226584Sdim "Fully relocatable, position independent code"), 90226584Sdim clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", 91226584Sdim "Relocatable external references, non-relocatable code"), 92226584Sdim clEnumValEnd)); 93226584Sdim 94226584Sdimstatic cl::opt<llvm::CodeModel::Model> 95226584SdimCMModel("code-model", 96226584Sdim cl::desc("Choose code model"), 97226584Sdim cl::init(CodeModel::Default), 98226584Sdim cl::values(clEnumValN(CodeModel::Default, "default", 99226584Sdim "Target default code model"), 100226584Sdim clEnumValN(CodeModel::Small, "small", 101226584Sdim "Small code model"), 102226584Sdim clEnumValN(CodeModel::Kernel, "kernel", 103226584Sdim "Kernel code model"), 104226584Sdim clEnumValN(CodeModel::Medium, "medium", 105226584Sdim "Medium code model"), 106226584Sdim clEnumValN(CodeModel::Large, "large", 107226584Sdim "Large code model"), 108226584Sdim clEnumValEnd)); 109226584Sdim 110212793Sdimstatic cl::opt<bool> 111212793SdimRelaxAll("mc-relax-all", 112212793Sdim cl::desc("When used with filetype=obj, " 113212793Sdim "relax all fixups in the emitted object file")); 114212793Sdim 115193323Sedcl::opt<TargetMachine::CodeGenFileType> 116203954SrdivackyFileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile), 117193323Sed cl::desc("Choose a file type (not all types are supported by all targets):"), 118193323Sed cl::values( 119203954Srdivacky clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm", 120193323Sed "Emit an assembly ('.s') file"), 121203954Srdivacky clEnumValN(TargetMachine::CGFT_ObjectFile, "obj", 122193323Sed "Emit a native object ('.o') file [experimental]"), 123203954Srdivacky clEnumValN(TargetMachine::CGFT_Null, "null", 124203954Srdivacky "Emit nothing, for performance testing"), 125193323Sed clEnumValEnd)); 126193323Sed 127193323Sedcl::opt<bool> NoVerify("disable-verify", cl::Hidden, 128193323Sed cl::desc("Do not verify input module")); 129193323Sed 130218885Sdimcl::opt<bool> DisableDotLoc("disable-dot-loc", cl::Hidden, 131218885Sdim cl::desc("Do not use .loc entries")); 132193323Sed 133221337Sdimcl::opt<bool> DisableCFI("disable-cfi", cl::Hidden, 134221337Sdim cl::desc("Do not use .cfi_* directives")); 135221337Sdim 136193574Sedstatic cl::opt<bool> 137193574SedDisableRedZone("disable-red-zone", 138193574Sed cl::desc("Do not emit code that uses the red zone."), 139193574Sed cl::init(false)); 140193574Sed 141193323Sed// GetFileNameRoot - Helper function to get the basename of a filename. 142193323Sedstatic inline std::string 143193323SedGetFileNameRoot(const std::string &InputFilename) { 144193323Sed std::string IFN = InputFilename; 145193323Sed std::string outputFilename; 146193323Sed int Len = IFN.length(); 147193323Sed if ((Len > 2) && 148198090Srdivacky IFN[Len-3] == '.' && 149198090Srdivacky ((IFN[Len-2] == 'b' && IFN[Len-1] == 'c') || 150198090Srdivacky (IFN[Len-2] == 'l' && IFN[Len-1] == 'l'))) { 151193323Sed outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/ 152193323Sed } else { 153193323Sed outputFilename = IFN; 154193323Sed } 155193323Sed return outputFilename; 156193323Sed} 157193323Sed 158212793Sdimstatic tool_output_file *GetOutputStream(const char *TargetName, 159212793Sdim Triple::OSType OS, 160212793Sdim const char *ProgName) { 161212793Sdim // If we don't yet have an output filename, make one. 162212793Sdim if (OutputFilename.empty()) { 163212793Sdim if (InputFilename == "-") 164212793Sdim OutputFilename = "-"; 165212793Sdim else { 166212793Sdim OutputFilename = GetFileNameRoot(InputFilename); 167193323Sed 168212793Sdim switch (FileType) { 169212793Sdim default: assert(0 && "Unknown file type"); 170212793Sdim case TargetMachine::CGFT_AssemblyFile: 171212793Sdim if (TargetName[0] == 'c') { 172212793Sdim if (TargetName[1] == 0) 173212793Sdim OutputFilename += ".cbe.c"; 174212793Sdim else if (TargetName[1] == 'p' && TargetName[2] == 'p') 175212793Sdim OutputFilename += ".cpp"; 176212793Sdim else 177212793Sdim OutputFilename += ".s"; 178212793Sdim } else 179212793Sdim OutputFilename += ".s"; 180212793Sdim break; 181212793Sdim case TargetMachine::CGFT_ObjectFile: 182212793Sdim if (OS == Triple::Win32) 183212793Sdim OutputFilename += ".obj"; 184212793Sdim else 185212793Sdim OutputFilename += ".o"; 186212793Sdim break; 187212793Sdim case TargetMachine::CGFT_Null: 188212793Sdim OutputFilename += ".null"; 189212793Sdim break; 190212793Sdim } 191193323Sed } 192193323Sed } 193193323Sed 194212793Sdim // Decide if we need "binary" output. 195193323Sed bool Binary = false; 196193323Sed switch (FileType) { 197203954Srdivacky default: assert(0 && "Unknown file type"); 198203954Srdivacky case TargetMachine::CGFT_AssemblyFile: 199193323Sed break; 200203954Srdivacky case TargetMachine::CGFT_ObjectFile: 201203954Srdivacky case TargetMachine::CGFT_Null: 202193323Sed Binary = true; 203193323Sed break; 204193323Sed } 205193323Sed 206212793Sdim // Open the file. 207193323Sed std::string error; 208198090Srdivacky unsigned OpenFlags = 0; 209198090Srdivacky if (Binary) OpenFlags |= raw_fd_ostream::F_Binary; 210212793Sdim tool_output_file *FDOut = new tool_output_file(OutputFilename.c_str(), error, 211212793Sdim OpenFlags); 212193323Sed if (!error.empty()) { 213198090Srdivacky errs() << error << '\n'; 214198090Srdivacky delete FDOut; 215193323Sed return 0; 216193323Sed } 217193323Sed 218212793Sdim return FDOut; 219193323Sed} 220193323Sed 221193323Sed// main - Entry point for the llc compiler. 222193323Sed// 223193323Sedint main(int argc, char **argv) { 224193323Sed sys::PrintStackTraceOnErrorSignal(); 225193323Sed PrettyStackTraceProgram X(argc, argv); 226202375Srdivacky 227202375Srdivacky // Enable debug stream buffering. 228202375Srdivacky EnableDebugBuffering = true; 229202375Srdivacky 230198090Srdivacky LLVMContext &Context = getGlobalContext(); 231193323Sed llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 232193323Sed 233198090Srdivacky // Initialize targets first, so that --version shows registered targets. 234194612Sed InitializeAllTargets(); 235226584Sdim InitializeAllTargetMCs(); 236194612Sed InitializeAllAsmPrinters(); 237206274Srdivacky InitializeAllAsmParsers(); 238198090Srdivacky 239226584Sdim // Register the target printer for --version. 240226584Sdim cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion); 241226584Sdim 242198090Srdivacky cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); 243221337Sdim 244193323Sed // Load the module to be compiled... 245198090Srdivacky SMDiagnostic Err; 246193323Sed std::auto_ptr<Module> M; 247193323Sed 248198090Srdivacky M.reset(ParseIRFile(InputFilename, Err, Context)); 249193323Sed if (M.get() == 0) { 250198090Srdivacky Err.Print(argv[0], errs()); 251193323Sed return 1; 252193323Sed } 253193323Sed Module &mod = *M.get(); 254193323Sed 255193323Sed // If we are supposed to override the target triple, do so now. 256193323Sed if (!TargetTriple.empty()) 257212793Sdim mod.setTargetTriple(Triple::normalize(TargetTriple)); 258193323Sed 259198090Srdivacky Triple TheTriple(mod.getTargetTriple()); 260198090Srdivacky if (TheTriple.getTriple().empty()) 261198090Srdivacky TheTriple.setTriple(sys::getHostTriple()); 262198090Srdivacky 263198090Srdivacky // Allocate target machine. First, check whether the user has explicitly 264198090Srdivacky // specified an architecture to compile for. If so we have to look it up by 265198090Srdivacky // name, because it might be a backend that has no mapping to a target triple. 266198090Srdivacky const Target *TheTarget = 0; 267198090Srdivacky if (!MArch.empty()) { 268198090Srdivacky for (TargetRegistry::iterator it = TargetRegistry::begin(), 269198090Srdivacky ie = TargetRegistry::end(); it != ie; ++it) { 270198090Srdivacky if (MArch == it->getName()) { 271198090Srdivacky TheTarget = &*it; 272198090Srdivacky break; 273198090Srdivacky } 274198090Srdivacky } 275198090Srdivacky 276198090Srdivacky if (!TheTarget) { 277198090Srdivacky errs() << argv[0] << ": error: invalid target '" << MArch << "'.\n"; 278198090Srdivacky return 1; 279198090Srdivacky } 280198090Srdivacky 281198090Srdivacky // Adjust the triple to match (if known), otherwise stick with the 282198090Srdivacky // module/host triple. 283198090Srdivacky Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch); 284198090Srdivacky if (Type != Triple::UnknownArch) 285198090Srdivacky TheTriple.setArch(Type); 286198090Srdivacky } else { 287193323Sed std::string Err; 288198090Srdivacky TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Err); 289198090Srdivacky if (TheTarget == 0) { 290198090Srdivacky errs() << argv[0] << ": error auto-selecting target for module '" 291198090Srdivacky << Err << "'. Please use the -march option to explicitly " 292198090Srdivacky << "pick a target.\n"; 293193323Sed return 1; 294193323Sed } 295193323Sed } 296193323Sed 297193323Sed // Package up features to be passed to target/subtarget 298193323Sed std::string FeaturesStr; 299224133Sdim if (MAttrs.size()) { 300193323Sed SubtargetFeatures Features; 301193323Sed for (unsigned i = 0; i != MAttrs.size(); ++i) 302193323Sed Features.AddFeature(MAttrs[i]); 303193323Sed FeaturesStr = Features.getString(); 304193323Sed } 305193323Sed 306221337Sdim std::auto_ptr<TargetMachine> 307226584Sdim target(TheTarget->createTargetMachine(TheTriple.getTriple(), 308226584Sdim MCPU, FeaturesStr, 309226584Sdim RelocModel, CMModel)); 310193323Sed assert(target.get() && "Could not allocate target machine!"); 311193323Sed TargetMachine &Target = *target.get(); 312193323Sed 313218885Sdim if (DisableDotLoc) 314218885Sdim Target.setMCUseLoc(false); 315218885Sdim 316221337Sdim if (DisableCFI) 317221337Sdim Target.setMCUseCFI(false); 318221337Sdim 319221337Sdim // Disable .loc support for older OS X versions. 320221337Sdim if (TheTriple.isMacOSX() && 321221337Sdim TheTriple.isMacOSXVersionLT(10, 6)) 322221337Sdim Target.setMCUseLoc(false); 323221337Sdim 324193323Sed // Figure out where we are going to send the output... 325212793Sdim OwningPtr<tool_output_file> Out 326212793Sdim (GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0])); 327212793Sdim if (!Out) return 1; 328193323Sed 329193323Sed CodeGenOpt::Level OLvl = CodeGenOpt::Default; 330193323Sed switch (OptLevel) { 331193323Sed default: 332198090Srdivacky errs() << argv[0] << ": invalid optimization level.\n"; 333193323Sed return 1; 334193323Sed case ' ': break; 335193323Sed case '0': OLvl = CodeGenOpt::None; break; 336198396Srdivacky case '1': OLvl = CodeGenOpt::Less; break; 337193323Sed case '2': OLvl = CodeGenOpt::Default; break; 338193323Sed case '3': OLvl = CodeGenOpt::Aggressive; break; 339193323Sed } 340193323Sed 341208599Srdivacky // Build up all of the passes that we want to do to the module. 342208599Srdivacky PassManager PM; 343198090Srdivacky 344208599Srdivacky // Add the target data from the target machine, if it exists, or the module. 345208599Srdivacky if (const TargetData *TD = Target.getTargetData()) 346208599Srdivacky PM.add(new TargetData(*TD)); 347208599Srdivacky else 348208599Srdivacky PM.add(new TargetData(&mod)); 349198090Srdivacky 350208599Srdivacky // Override default to generate verbose assembly. 351208599Srdivacky Target.setAsmVerbosityDefault(true); 352193323Sed 353212793Sdim if (RelaxAll) { 354212793Sdim if (FileType != TargetMachine::CGFT_ObjectFile) 355212793Sdim errs() << argv[0] 356212793Sdim << ": warning: ignoring -mc-relax-all because filetype != obj"; 357212793Sdim else 358212793Sdim Target.setMCRelaxAll(true); 359208599Srdivacky } 360198090Srdivacky 361212793Sdim { 362212793Sdim formatted_raw_ostream FOS(Out->os()); 363193323Sed 364212793Sdim // Ask the target to add backend passes as necessary. 365212793Sdim if (Target.addPassesToEmitFile(PM, FOS, FileType, OLvl, NoVerify)) { 366212793Sdim errs() << argv[0] << ": target does not support generation of this" 367212793Sdim << " file type!\n"; 368212793Sdim return 1; 369212793Sdim } 370193323Sed 371221337Sdim // Before executing passes, print the final values of the LLVM options. 372221337Sdim cl::PrintOptionValues(); 373221337Sdim 374212793Sdim PM.run(mod); 375212793Sdim } 376212793Sdim 377212793Sdim // Declare success. 378212793Sdim Out->keep(); 379212793Sdim 380193323Sed return 0; 381193323Sed} 382