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