llvm/tools/llc/llc.cpp

   1 //===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This is the llc code generator driver. It provides a convenient
  10 // command-line interface for generating native assembly-language code
  11 // or C code, given LLVM bitcode.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/ADT/STLExtras.h"
  16 #include "llvm/ADT/ScopeExit.h"
  17 #include "llvm/Analysis/TargetLibraryInfo.h"
  18 #include "llvm/CodeGen/CommandFlags.h"
  19 #include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
  20 #include "llvm/CodeGen/LinkAllCodegenComponents.h"
  21 #include "llvm/CodeGen/MIRParser/MIRParser.h"
  22 #include "llvm/CodeGen/MachineFunctionPass.h"
  23 #include "llvm/CodeGen/MachineModuleInfo.h"
  24 #include "llvm/CodeGen/TargetPassConfig.h"
  25 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  26 #include "llvm/IR/AutoUpgrade.h"
  27 #include "llvm/IR/DataLayout.h"
  28 #include "llvm/IR/DiagnosticInfo.h"
  29 #include "llvm/IR/DiagnosticPrinter.h"
  30 #include "llvm/IR/LLVMContext.h"
  31 #include "llvm/IR/LLVMRemarkStreamer.h"
  32 #include "llvm/IR/LegacyPassManager.h"
  33 #include "llvm/IR/Module.h"
  34 #include "llvm/IR/Verifier.h"
  35 #include "llvm/IRReader/IRReader.h"
  36 #include "llvm/InitializePasses.h"
  37 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
  38 #include "llvm/MC/TargetRegistry.h"
  39 #include "llvm/Pass.h"
  40 #include "llvm/Remarks/HotnessThresholdParser.h"
  41 #include "llvm/Support/CommandLine.h"
  42 #include "llvm/Support/Debug.h"
  43 #include "llvm/Support/FileSystem.h"
  44 #include "llvm/Support/FormattedStream.h"
  45 #include "llvm/Support/InitLLVM.h"
  46 #include "llvm/Support/PluginLoader.h"
  47 #include "llvm/Support/SourceMgr.h"
  48 #include "llvm/Support/TargetSelect.h"
  49 #include "llvm/Support/TimeProfiler.h"
  50 #include "llvm/Support/ToolOutputFile.h"
  51 #include "llvm/Support/WithColor.h"
  52 #include "llvm/Target/TargetLoweringObjectFile.h"
  53 #include "llvm/Target/TargetMachine.h"
  54 #include "llvm/TargetParser/Host.h"
  55 #include "llvm/TargetParser/SubtargetFeature.h"
  56 #include "llvm/TargetParser/Triple.h"
  57 #include "llvm/Transforms/Utils/Cloning.h"
  58 #include <memory>
  59 #include <optional>
  60 using namespace llvm;
  61
  62 static codegen::RegisterCodeGenFlags CGF;
  63
  64 // General options for llc.  Other pass-specific options are specified
  65 // within the corresponding llc passes, and target-specific options
  66 // and back-end code generation options are specified with the target machine.
  67 //
  68 static cl::opt<std::string>
  69 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
  70
  71 static cl::opt<std::string>
  72 InputLanguage("x", cl::desc("Input language ('ir' or 'mir')"));
  73
  74 static cl::opt<std::string>
  75 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
  76
  77 static cl::opt<std::string>
  78     SplitDwarfOutputFile("split-dwarf-output",
  79                          cl::desc(".dwo output filename"),
  80                          cl::value_desc("filename"));
  81
  82 static cl::opt<unsigned>
  83 TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
  84                  cl::value_desc("N"),
  85                  cl::desc("Repeat compilation N times for timing"));
  86
  87 static cl::opt<bool> TimeTrace("time-trace", cl::desc("Record time trace"));
  88
  89 static cl::opt<unsigned> TimeTraceGranularity(
  90     "time-trace-granularity",
  91     cl::desc(
  92         "Minimum time granularity (in microseconds) traced by time profiler"),
  93     cl::init(500), cl::Hidden);
  94
  95 static cl::opt<std::string>
  96     TimeTraceFile("time-trace-file",
  97                   cl::desc("Specify time trace file destination"),
  98                   cl::value_desc("filename"));
  99
 100 static cl::opt<std::string>
 101     BinutilsVersion("binutils-version", cl::Hidden,
 102                     cl::desc("Produced object files can use all ELF features "
 103                              "supported by this binutils version and newer."
 104                              "If -no-integrated-as is specified, the generated "
 105                              "assembly will consider GNU as support."
 106                              "'none' means that all ELF features can be used, "
 107                              "regardless of binutils support"));
 108
 109 static cl::opt<bool>
 110     PreserveComments("preserve-as-comments", cl::Hidden,
 111                      cl::desc("Preserve Comments in outputted assembly"),
 112                      cl::init(true));
 113
 114 // Determine optimization level.
 115 static cl::opt<char>
 116     OptLevel("O",
 117              cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
 118                       "(default = '-O2')"),
 119              cl::Prefix, cl::init('2'));
 120
 121 static cl::opt<std::string>
 122 TargetTriple("mtriple", cl::desc("Override target triple for module"));
 123
 124 static cl::opt<std::string> SplitDwarfFile(
 125     "split-dwarf-file",
 126     cl::desc(
 127         "Specify the name of the .dwo file to encode in the DWARF output"));
 128
 129 static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
 130                               cl::desc("Do not verify input module"));
 131
 132 static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls",
 133                                              cl::desc("Disable simplify-libcalls"));
 134
 135 static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
 136                                     cl::desc("Show encoding in .s output"));
 137
 138 static cl::opt<bool>
 139     DwarfDirectory("dwarf-directory", cl::Hidden,
 140                    cl::desc("Use .file directives with an explicit directory"),
 141                    cl::init(true));
 142
 143 static cl::opt<bool> AsmVerbose("asm-verbose",
 144                                 cl::desc("Add comments to directives."),
 145                                 cl::init(true));
 146
 147 static cl::opt<bool>
 148     CompileTwice("compile-twice", cl::Hidden,
 149                  cl::desc("Run everything twice, re-using the same pass "
 150                           "manager and verify the result is the same."),
 151                  cl::init(false));
 152
 153 static cl::opt<bool> DiscardValueNames(
 154     "discard-value-names",
 155     cl::desc("Discard names from Value (other than GlobalValue)."),
 156     cl::init(false), cl::Hidden);
 157
 158 static cl::list<std::string> IncludeDirs("I", cl::desc("include search path"));
 159
 160 static cl::opt<bool> RemarksWithHotness(
 161     "pass-remarks-with-hotness",
 162     cl::desc("With PGO, include profile count in optimization remarks"),
 163     cl::Hidden);
 164
 165 static cl::opt<std::optional<uint64_t>, false, remarks::HotnessThresholdParser>
 166     RemarksHotnessThreshold(
 167         "pass-remarks-hotness-threshold",
 168         cl::desc("Minimum profile count required for "
 169                  "an optimization remark to be output. "
 170                  "Use 'auto' to apply the threshold from profile summary."),
 171         cl::value_desc("N or 'auto'"), cl::init(0), cl::Hidden);
 172
 173 static cl::opt<std::string>
 174     RemarksFilename("pass-remarks-output",
 175                     cl::desc("Output filename for pass remarks"),
 176                     cl::value_desc("filename"));
 177
 178 static cl::opt<std::string>
 179     RemarksPasses("pass-remarks-filter",
 180                   cl::desc("Only record optimization remarks from passes whose "
 181                            "names match the given regular expression"),
 182                   cl::value_desc("regex"));
 183
 184 static cl::opt<std::string> RemarksFormat(
 185     "pass-remarks-format",
 186     cl::desc("The format used for serializing remarks (default: YAML)"),
 187     cl::value_desc("format"), cl::init("yaml"));
 188
 189 namespace {
 190
 191 std::vector<std::string> &getRunPassNames() {
 192   static std::vector<std::string> RunPassNames;
 193   return RunPassNames;
 194 }
 195
 196 struct RunPassOption {
 197   void operator=(const std::string &Val) const {
 198     if (Val.empty())
 199       return;
 200     SmallVector<StringRef, 8> PassNames;
 201     StringRef(Val).split(PassNames, ',', -1, false);
 202     for (auto PassName : PassNames)
 203       getRunPassNames().push_back(std::string(PassName));
 204   }
 205 };
 206 }
 207
 208 static RunPassOption RunPassOpt;
 209
 210 static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass(
 211     "run-pass",
 212     cl::desc("Run compiler only for specified passes (comma separated list)"),
 213     cl::value_desc("pass-name"), cl::location(RunPassOpt));
 214
 215 static int compileModule(char **, LLVMContext &);
 216
 217 [[noreturn]] static void reportError(Twine Msg, StringRef Filename = "") {
 218   SmallString<256> Prefix;
 219   if (!Filename.empty()) {
 220     if (Filename == "-")
 221       Filename = "<stdin>";
 222     ("'" + Twine(Filename) + "': ").toStringRef(Prefix);
 223   }
 224   WithColor::error(errs(), "llc") << Prefix << Msg << "\n";
 225   exit(1);
 226 }
 227
 228 [[noreturn]] static void reportError(Error Err, StringRef Filename) {
 229   assert(Err);
 230   handleAllErrors(createFileError(Filename, std::move(Err)),
 231                   [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
 232   llvm_unreachable("reportError() should not return");
 233 }
 234
 235 static std::unique_ptr<ToolOutputFile> GetOutputStream(const char *TargetName,
 236                                                        Triple::OSType OS,
 237                                                        const char *ProgName) {
 238   // If we don't yet have an output filename, make one.
 239   if (OutputFilename.empty()) {
 240     if (InputFilename == "-")
 241       OutputFilename = "-";
 242     else {
 243       // If InputFilename ends in .bc or .ll, remove it.
 244       StringRef IFN = InputFilename;
 245       if (IFN.endswith(".bc") || IFN.endswith(".ll"))
 246         OutputFilename = std::string(IFN.drop_back(3));
 247       else if (IFN.endswith(".mir"))
 248         OutputFilename = std::string(IFN.drop_back(4));
 249       else
 250         OutputFilename = std::string(IFN);
 251
 252       switch (codegen::getFileType()) {
 253       case CodeGenFileType::AssemblyFile:
 254         if (TargetName[0] == 'c') {
 255           if (TargetName[1] == 0)
 256             OutputFilename += ".cbe.c";
 257           else if (TargetName[1] == 'p' && TargetName[2] == 'p')
 258             OutputFilename += ".cpp";
 259           else
 260             OutputFilename += ".s";
 261         } else
 262           OutputFilename += ".s";
 263         break;
 264       case CodeGenFileType::ObjectFile:
 265         if (OS == Triple::Win32)
 266           OutputFilename += ".obj";
 267         else
 268           OutputFilename += ".o";
 269         break;
 270       case CodeGenFileType::Null:
 271         OutputFilename = "-";
 272         break;
 273       }
 274     }
 275   }
 276
 277   // Decide if we need "binary" output.
 278   bool Binary = false;
 279   switch (codegen::getFileType()) {
 280   case CodeGenFileType::AssemblyFile:
 281     break;
 282   case CodeGenFileType::ObjectFile:
 283   case CodeGenFileType::Null:
 284     Binary = true;
 285     break;
 286   }
 287
 288   // Open the file.
 289   std::error_code EC;
 290   sys::fs::OpenFlags OpenFlags = sys::fs::OF_None;
 291   if (!Binary)
 292     OpenFlags |= sys::fs::OF_TextWithCRLF;
 293   auto FDOut = std::make_unique<ToolOutputFile>(OutputFilename, EC, OpenFlags);
 294   if (EC) {
 295     reportError(EC.message());
 296     return nullptr;
 297   }
 298
 299   return FDOut;
 300 }
 301
 302 struct LLCDiagnosticHandler : public DiagnosticHandler {
 303   bool *HasError;
 304   LLCDiagnosticHandler(bool *HasErrorPtr) : HasError(HasErrorPtr) {}
 305   bool handleDiagnostics(const DiagnosticInfo &DI) override {
 306     if (DI.getKind() == llvm::DK_SrcMgr) {
 307       const auto &DISM = cast<DiagnosticInfoSrcMgr>(DI);
 308       const SMDiagnostic &SMD = DISM.getSMDiag();
 309
 310       if (SMD.getKind() == SourceMgr::DK_Error)
 311         *HasError = true;
 312
 313       SMD.print(nullptr, errs());
 314
 315       // For testing purposes, we print the LocCookie here.
 316       if (DISM.isInlineAsmDiag() && DISM.getLocCookie())
 317         WithColor::note() << "!srcloc = " << DISM.getLocCookie() << "\n";
 318
 319       return true;
 320     }
 321
 322     if (DI.getSeverity() == DS_Error)
 323       *HasError = true;
 324
 325     if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI))
 326       if (!Remark->isEnabled())
 327         return true;
 328
 329     DiagnosticPrinterRawOStream DP(errs());
 330     errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": ";
 331     DI.print(DP);
 332     errs() << "\n";
 333     return true;
 334   }
 335 };
 336
 337 // main - Entry point for the llc compiler.
 338 //
 339 int main(int argc, char **argv) {
 340   InitLLVM X(argc, argv);
 341
 342   // Enable debug stream buffering.
 343   EnableDebugBuffering = true;
 344
 345   // Initialize targets first, so that --version shows registered targets.
 346   InitializeAllTargets();
 347   InitializeAllTargetMCs();
 348   InitializeAllAsmPrinters();
 349   InitializeAllAsmParsers();
 350
 351   // Initialize codegen and IR passes used by llc so that the -print-after,
 352   // -print-before, and -stop-after options work.
 353   PassRegistry *Registry = PassRegistry::getPassRegistry();
 354   initializeCore(*Registry);
 355   initializeCodeGen(*Registry);
 356   initializeLoopStrengthReducePass(*Registry);
 357   initializeLowerIntrinsicsPass(*Registry);
 358   initializeUnreachableBlockElimLegacyPassPass(*Registry);
 359   initializeConstantHoistingLegacyPassPass(*Registry);
 360   initializeScalarOpts(*Registry);
 361   initializeVectorization(*Registry);
 362   initializeScalarizeMaskedMemIntrinLegacyPassPass(*Registry);
 363   initializeExpandReductionsPass(*Registry);
 364   initializeExpandVectorPredicationPass(*Registry);
 365   initializeHardwareLoopsLegacyPass(*Registry);
 366   initializeTransformUtils(*Registry);
 367   initializeReplaceWithVeclibLegacyPass(*Registry);
 368   initializeTLSVariableHoistLegacyPassPass(*Registry);
 369
 370   // Initialize debugging passes.
 371   initializeScavengerTestPass(*Registry);
 372
 373   // Register the Target and CPU printer for --version.
 374   cl::AddExtraVersionPrinter(sys::printDefaultTargetAndDetectedCPU);
 375   // Register the target printer for --version.
 376   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
 377
 378   cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
 379
 380   if (TimeTrace)
 381     timeTraceProfilerInitialize(TimeTraceGranularity, argv[0]);
 382   auto TimeTraceScopeExit = make_scope_exit([]() {
 383     if (TimeTrace) {
 384       if (auto E = timeTraceProfilerWrite(TimeTraceFile, OutputFilename)) {
 385         handleAllErrors(std::move(E), [&](const StringError &SE) {
 386           errs() << SE.getMessage() << "\n";
 387         });
 388         return;
 389       }
 390       timeTraceProfilerCleanup();
 391     }
 392   });
 393
 394   LLVMContext Context;
 395   Context.setDiscardValueNames(DiscardValueNames);
 396
 397   // Set a diagnostic handler that doesn't exit on the first error
 398   bool HasError = false;
 399   Context.setDiagnosticHandler(
 400       std::make_unique<LLCDiagnosticHandler>(&HasError));
 401
 402   Expected<std::unique_ptr<ToolOutputFile>> RemarksFileOrErr =
 403       setupLLVMOptimizationRemarks(Context, RemarksFilename, RemarksPasses,
 404                                    RemarksFormat, RemarksWithHotness,
 405                                    RemarksHotnessThreshold);
 406   if (Error E = RemarksFileOrErr.takeError())
 407     reportError(std::move(E), RemarksFilename);
 408   std::unique_ptr<ToolOutputFile> RemarksFile = std::move(*RemarksFileOrErr);
 409
 410   if (InputLanguage != "" && InputLanguage != "ir" && InputLanguage != "mir")
 411     reportError("input language must be '', 'IR' or 'MIR'");
 412
 413   // Compile the module TimeCompilations times to give better compile time
 414   // metrics.
 415   for (unsigned I = TimeCompilations; I; --I)
 416     if (int RetVal = compileModule(argv, Context))
 417       return RetVal;
 418
 419   if (RemarksFile)
 420     RemarksFile->keep();
 421   return 0;
 422 }
 423
 424 static bool addPass(PassManagerBase &PM, const char *argv0,
 425                     StringRef PassName, TargetPassConfig &TPC) {
 426   if (PassName == "none")
 427     return false;
 428
 429   const PassRegistry *PR = PassRegistry::getPassRegistry();
 430   const PassInfo *PI = PR->getPassInfo(PassName);
 431   if (!PI) {
 432     WithColor::error(errs(), argv0)
 433         << "run-pass " << PassName << " is not registered.\n";
 434     return true;
 435   }
 436
 437   Pass *P;
 438   if (PI->getNormalCtor())
 439     P = PI->getNormalCtor()();
 440   else {
 441     WithColor::error(errs(), argv0)
 442         << "cannot create pass: " << PI->getPassName() << "\n";
 443     return true;
 444   }
 445   std::string Banner = std::string("After ") + std::string(P->getPassName());
 446   TPC.addMachinePrePasses();
 447   PM.add(P);
 448   TPC.addMachinePostPasses(Banner);
 449
 450   return false;
 451 }
 452
 453 static int compileModule(char **argv, LLVMContext &Context) {
 454   // Load the module to be compiled...
 455   SMDiagnostic Err;
 456   std::unique_ptr<Module> M;
 457   std::unique_ptr<MIRParser> MIR;
 458   Triple TheTriple;
 459   std::string CPUStr = codegen::getCPUStr(),
 460               FeaturesStr = codegen::getFeaturesStr();
 461
 462   // Set attributes on functions as loaded from MIR from command line arguments.
 463   auto setMIRFunctionAttributes = [&CPUStr, &FeaturesStr](Function &F) {
 464     codegen::setFunctionAttributes(CPUStr, FeaturesStr, F);
 465   };
 466
 467   auto MAttrs = codegen::getMAttrs();
 468   bool SkipModule =
 469       CPUStr == "help" || (!MAttrs.empty() && MAttrs.front() == "help");
 470
 471   CodeGenOptLevel OLvl;
 472   if (auto Level = CodeGenOpt::parseLevel(OptLevel)) {
 473     OLvl = *Level;
 474   } else {
 475     WithColor::error(errs(), argv[0]) << "invalid optimization level.\n";
 476     return 1;
 477   }
 478
 479   // Parse 'none' or '$major.$minor'. Disallow -binutils-version=0 because we
 480   // use that to indicate the MC default.
 481   if (!BinutilsVersion.empty() && BinutilsVersion != "none") {
 482     StringRef V = BinutilsVersion.getValue();
 483     unsigned Num;
 484     if (V.consumeInteger(10, Num) || Num == 0 ||
 485         !(V.empty() ||
 486           (V.consume_front(".") && !V.consumeInteger(10, Num) && V.empty()))) {
 487       WithColor::error(errs(), argv[0])
 488           << "invalid -binutils-version, accepting 'none' or major.minor\n";
 489       return 1;
 490     }
 491   }
 492   TargetOptions Options;
 493   auto InitializeOptions = [&](const Triple &TheTriple) {
 494     Options = codegen::InitTargetOptionsFromCodeGenFlags(TheTriple);
 495
 496     if (Options.XCOFFReadOnlyPointers) {
 497       if (!TheTriple.isOSAIX())
 498         reportError("-mxcoff-roptr option is only supported on AIX",
 499                     InputFilename);
 500
 501       // Since the storage mapping class is specified per csect,
 502       // without using data sections, it is less effective to use read-only
 503       // pointers. Using read-only pointers may cause other RO variables in the
 504       // same csect to become RW when the linker acts upon `-bforceimprw`;
 505       // therefore, we require that separate data sections are used in the
 506       // presence of ReadOnlyPointers. We respect the setting of data-sections
 507       // since we have not found reasons to do otherwise that overcome the user
 508       // surprise of not respecting the setting.
 509       if (!Options.DataSections)
 510         reportError("-mxcoff-roptr option must be used with -data-sections",
 511                     InputFilename);
 512     }
 513
 514     Options.BinutilsVersion =
 515         TargetMachine::parseBinutilsVersion(BinutilsVersion);
 516     Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
 517     Options.MCOptions.AsmVerbose = AsmVerbose;
 518     Options.MCOptions.PreserveAsmComments = PreserveComments;
 519     Options.MCOptions.IASSearchPaths = IncludeDirs;
 520     Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
 521     if (DwarfDirectory.getPosition()) {
 522       Options.MCOptions.MCUseDwarfDirectory =
 523           DwarfDirectory ? MCTargetOptions::EnableDwarfDirectory
 524                          : MCTargetOptions::DisableDwarfDirectory;
 525     } else {
 526       // -dwarf-directory is not set explicitly. Some assemblers
 527       // (e.g. GNU as or ptxas) do not support `.file directory'
 528       // syntax prior to DWARFv5. Let the target decide the default
 529       // value.
 530       Options.MCOptions.MCUseDwarfDirectory =
 531           MCTargetOptions::DefaultDwarfDirectory;
 532     }
 533   };
 534
 535   std::optional<Reloc::Model> RM = codegen::getExplicitRelocModel();
 536   std::optional<CodeModel::Model> CM = codegen::getExplicitCodeModel();
 537
 538   const Target *TheTarget = nullptr;
 539   std::unique_ptr<TargetMachine> Target;
 540
 541   // If user just wants to list available options, skip module loading
 542   if (!SkipModule) {
 543     auto SetDataLayout = [&](StringRef DataLayoutTargetTriple,
 544                              StringRef OldDLStr) -> std::optional<std::string> {
 545       // If we are supposed to override the target triple, do so now.
 546       std::string IRTargetTriple = DataLayoutTargetTriple.str();
 547       if (!TargetTriple.empty())
 548         IRTargetTriple = Triple::normalize(TargetTriple);
 549       TheTriple = Triple(IRTargetTriple);
 550       if (TheTriple.getTriple().empty())
 551         TheTriple.setTriple(sys::getDefaultTargetTriple());
 552
 553       std::string Error;
 554       TheTarget =
 555           TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);
 556       if (!TheTarget) {
 557         WithColor::error(errs(), argv[0]) << Error;
 558         exit(1);
 559       }
 560
 561       InitializeOptions(TheTriple);
 562       Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
 563           TheTriple.getTriple(), CPUStr, FeaturesStr, Options, RM, CM, OLvl));
 564       assert(Target && "Could not allocate target machine!");
 565
 566       return Target->createDataLayout().getStringRepresentation();
 567     };
 568     if (InputLanguage == "mir" ||
 569         (InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) {
 570       MIR = createMIRParserFromFile(InputFilename, Err, Context,
 571                                     setMIRFunctionAttributes);
 572       if (MIR)
 573         M = MIR->parseIRModule(SetDataLayout);
 574     } else {
 575       M = parseIRFile(InputFilename, Err, Context,
 576                       ParserCallbacks(SetDataLayout));
 577     }
 578     if (!M) {
 579       Err.print(argv[0], WithColor::error(errs(), argv[0]));
 580       return 1;
 581     }
 582     if (!TargetTriple.empty())
 583       M->setTargetTriple(Triple::normalize(TargetTriple));
 584
 585     std::optional<CodeModel::Model> CM_IR = M->getCodeModel();
 586     if (!CM && CM_IR)
 587       Target->setCodeModel(*CM_IR);
 588     if (std::optional<uint64_t> LDT = codegen::getExplicitLargeDataThreshold())
 589       Target->setLargeDataThreshold(*LDT);
 590   } else {
 591     TheTriple = Triple(Triple::normalize(TargetTriple));
 592     if (TheTriple.getTriple().empty())
 593       TheTriple.setTriple(sys::getDefaultTargetTriple());
 594
 595     // Get the target specific parser.
 596     std::string Error;
 597     TheTarget =
 598         TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);
 599     if (!TheTarget) {
 600       WithColor::error(errs(), argv[0]) << Error;
 601       return 1;
 602     }
 603
 604     InitializeOptions(TheTriple);
 605     Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
 606         TheTriple.getTriple(), CPUStr, FeaturesStr, Options, RM, CM, OLvl));
 607     assert(Target && "Could not allocate target machine!");
 608
 609     // If we don't have a module then just exit now. We do this down
 610     // here since the CPU/Feature help is underneath the target machine
 611     // creation.
 612     return 0;
 613   }
 614
 615   assert(M && "Should have exited if we didn't have a module!");
 616   if (codegen::getFloatABIForCalls() != FloatABI::Default)
 617     Options.FloatABIType = codegen::getFloatABIForCalls();
 618
 619   // Figure out where we are going to send the output.
 620   std::unique_ptr<ToolOutputFile> Out =
 621       GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]);
 622   if (!Out) return 1;
 623
 624   // Ensure the filename is passed down to CodeViewDebug.
 625   Target->Options.ObjectFilenameForDebug = Out->outputFilename();
 626
 627   std::unique_ptr<ToolOutputFile> DwoOut;
 628   if (!SplitDwarfOutputFile.empty()) {
 629     std::error_code EC;
 630     DwoOut = std::make_unique<ToolOutputFile>(SplitDwarfOutputFile, EC,
 631                                                sys::fs::OF_None);
 632     if (EC)
 633       reportError(EC.message(), SplitDwarfOutputFile);
 634   }
 635
 636   // Build up all of the passes that we want to do to the module.
 637   legacy::PassManager PM;
 638
 639   // Add an appropriate TargetLibraryInfo pass for the module's triple.
 640   TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
 641
 642   // The -disable-simplify-libcalls flag actually disables all builtin optzns.
 643   if (DisableSimplifyLibCalls)
 644     TLII.disableAllFunctions();
 645   PM.add(new TargetLibraryInfoWrapperPass(TLII));
 646
 647   // Verify module immediately to catch problems before doInitialization() is
 648   // called on any passes.
 649   if (!NoVerify && verifyModule(*M, &errs()))
 650     reportError("input module cannot be verified", InputFilename);
 651
 652   // Override function attributes based on CPUStr, FeaturesStr, and command line
 653   // flags.
 654   codegen::setFunctionAttributes(CPUStr, FeaturesStr, *M);
 655
 656   if (mc::getExplicitRelaxAll() &&
 657       codegen::getFileType() != CodeGenFileType::ObjectFile)
 658     WithColor::warning(errs(), argv[0])
 659         << ": warning: ignoring -mc-relax-all because filetype != obj";
 660
 661   {
 662     raw_pwrite_stream *OS = &Out->os();
 663
 664     // Manually do the buffering rather than using buffer_ostream,
 665     // so we can memcmp the contents in CompileTwice mode
 666     SmallVector<char, 0> Buffer;
 667     std::unique_ptr<raw_svector_ostream> BOS;
 668     if ((codegen::getFileType() != CodeGenFileType::AssemblyFile &&
 669          !Out->os().supportsSeeking()) ||
 670         CompileTwice) {
 671       BOS = std::make_unique<raw_svector_ostream>(Buffer);
 672       OS = BOS.get();
 673     }
 674
 675     const char *argv0 = argv[0];
 676     LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine &>(*Target);
 677     MachineModuleInfoWrapperPass *MMIWP =
 678         new MachineModuleInfoWrapperPass(&LLVMTM);
 679
 680     // Construct a custom pass pipeline that starts after instruction
 681     // selection.
 682     if (!getRunPassNames().empty()) {
 683       if (!MIR) {
 684         WithColor::warning(errs(), argv[0])
 685             << "run-pass is for .mir file only.\n";
 686         delete MMIWP;
 687         return 1;
 688       }
 689       TargetPassConfig *PTPC = LLVMTM.createPassConfig(PM);
 690       TargetPassConfig &TPC = *PTPC;
 691       if (TPC.hasLimitedCodeGenPipeline()) {
 692         WithColor::warning(errs(), argv[0])
 693             << "run-pass cannot be used with "
 694             << TPC.getLimitedCodeGenPipelineReason(" and ") << ".\n";
 695         delete PTPC;
 696         delete MMIWP;
 697         return 1;
 698       }
 699
 700       TPC.setDisableVerify(NoVerify);
 701       PM.add(&TPC);
 702       PM.add(MMIWP);
 703       TPC.printAndVerify("");
 704       for (const std::string &RunPassName : getRunPassNames()) {
 705         if (addPass(PM, argv0, RunPassName, TPC))
 706           return 1;
 707       }
 708       TPC.setInitialized();
 709       PM.add(createPrintMIRPass(*OS));
 710       PM.add(createFreeMachineFunctionPass());
 711     } else if (Target->addPassesToEmitFile(
 712                    PM, *OS, DwoOut ? &DwoOut->os() : nullptr,
 713                    codegen::getFileType(), NoVerify, MMIWP)) {
 714       reportError("target does not support generation of this file type");
 715     }
 716
 717     const_cast<TargetLoweringObjectFile *>(LLVMTM.getObjFileLowering())
 718         ->Initialize(MMIWP->getMMI().getContext(), *Target);
 719     if (MIR) {
 720       assert(MMIWP && "Forgot to create MMIWP?");
 721       if (MIR->parseMachineFunctions(*M, MMIWP->getMMI()))
 722         return 1;
 723     }
 724
 725     // Before executing passes, print the final values of the LLVM options.
 726     cl::PrintOptionValues();
 727
 728     // If requested, run the pass manager over the same module again,
 729     // to catch any bugs due to persistent state in the passes. Note that
 730     // opt has the same functionality, so it may be worth abstracting this out
 731     // in the future.
 732     SmallVector<char, 0> CompileTwiceBuffer;
 733     if (CompileTwice) {
 734       std::unique_ptr<Module> M2(llvm::CloneModule(*M));
 735       PM.run(*M2);
 736       CompileTwiceBuffer = Buffer;
 737       Buffer.clear();
 738     }
 739
 740     PM.run(*M);
 741
 742     auto HasError =
 743         ((const LLCDiagnosticHandler *)(Context.getDiagHandlerPtr()))->HasError;
 744     if (*HasError)
 745       return 1;
 746
 747     // Compare the two outputs and make sure they're the same
 748     if (CompileTwice) {
 749       if (Buffer.size() != CompileTwiceBuffer.size() ||
 750           (memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) !=
 751            0)) {
 752         errs()
 753             << "Running the pass manager twice changed the output.\n"
 754                "Writing the result of the second run to the specified output\n"
 755                "To generate the one-run comparison binary, just run without\n"
 756                "the compile-twice option\n";
 757         Out->os() << Buffer;
 758         Out->keep();
 759         return 1;
 760       }
 761     }
 762
 763     if (BOS) {
 764       Out->os() << Buffer;
 765     }
 766   }
 767
 768   // Declare success.
 769   Out->keep();
 770   if (DwoOut)
 771     DwoOut->keep();
 772
 773   return 0;
 774 }