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