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