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, cl::init(' ')); 125 126 static cl::opt<std::string> 127 TargetTriple("mtriple", cl::desc("Override target triple for module")); 128 129 static cl::opt<std::string> SplitDwarfFile( 130 "split-dwarf-file", 131 cl::desc( 132 "Specify the name of the .dwo file to encode in the DWARF output")); 133 134 static cl::opt<bool> NoVerify("disable-verify", cl::Hidden, 135 cl::desc("Do not verify input module")); 136 137 static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls", 138 cl::desc("Disable simplify-libcalls")); 139 140 static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden, 141 cl::desc("Show encoding in .s output")); 142 143 static cl::opt<bool> 144 DwarfDirectory("dwarf-directory", cl::Hidden, 145 cl::desc("Use .file directives with an explicit directory"), 146 cl::init(true)); 147 148 static cl::opt<bool> AsmVerbose("asm-verbose", 149 cl::desc("Add comments to directives."), 150 cl::init(true)); 151 152 static cl::opt<bool> 153 CompileTwice("compile-twice", cl::Hidden, 154 cl::desc("Run everything twice, re-using the same pass " 155 "manager and verify the result is the same."), 156 cl::init(false)); 157 158 static cl::opt<bool> DiscardValueNames( 159 "discard-value-names", 160 cl::desc("Discard names from Value (other than GlobalValue)."), 161 cl::init(false), cl::Hidden); 162 163 static cl::list<std::string> IncludeDirs("I", cl::desc("include search path")); 164 165 static cl::opt<bool> RemarksWithHotness( 166 "pass-remarks-with-hotness", 167 cl::desc("With PGO, include profile count in optimization remarks"), 168 cl::Hidden); 169 170 static cl::opt<Optional<uint64_t>, false, remarks::HotnessThresholdParser> 171 RemarksHotnessThreshold( 172 "pass-remarks-hotness-threshold", 173 cl::desc("Minimum profile count required for " 174 "an optimization remark to be output. " 175 "Use 'auto' to apply the threshold from profile summary."), 176 cl::value_desc("N or 'auto'"), cl::init(0), cl::Hidden); 177 178 static cl::opt<std::string> 179 RemarksFilename("pass-remarks-output", 180 cl::desc("Output filename for pass remarks"), 181 cl::value_desc("filename")); 182 183 static cl::opt<std::string> 184 RemarksPasses("pass-remarks-filter", 185 cl::desc("Only record optimization remarks from passes whose " 186 "names match the given regular expression"), 187 cl::value_desc("regex")); 188 189 static cl::opt<std::string> RemarksFormat( 190 "pass-remarks-format", 191 cl::desc("The format used for serializing remarks (default: YAML)"), 192 cl::value_desc("format"), cl::init("yaml")); 193 194 namespace { 195 static ManagedStatic<std::vector<std::string>> RunPassNames; 196 197 struct RunPassOption { 198 void operator=(const std::string &Val) const { 199 if (Val.empty()) 200 return; 201 SmallVector<StringRef, 8> PassNames; 202 StringRef(Val).split(PassNames, ',', -1, false); 203 for (auto PassName : PassNames) 204 RunPassNames->push_back(std::string(PassName)); 205 } 206 }; 207 } 208 209 static RunPassOption RunPassOpt; 210 211 static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass( 212 "run-pass", 213 cl::desc("Run compiler only for specified passes (comma separated list)"), 214 cl::value_desc("pass-name"), cl::location(RunPassOpt)); 215 216 static int compileModule(char **, LLVMContext &); 217 218 [[noreturn]] static void reportError(Twine Msg, StringRef Filename = "") { 219 SmallString<256> Prefix; 220 if (!Filename.empty()) { 221 if (Filename == "-") 222 Filename = "<stdin>"; 223 ("'" + Twine(Filename) + "': ").toStringRef(Prefix); 224 } 225 WithColor::error(errs(), "llc") << Prefix << Msg << "\n"; 226 exit(1); 227 } 228 229 [[noreturn]] static void reportError(Error Err, StringRef Filename) { 230 assert(Err); 231 handleAllErrors(createFileError(Filename, std::move(Err)), 232 [&](const ErrorInfoBase &EI) { reportError(EI.message()); }); 233 llvm_unreachable("reportError() should not return"); 234 } 235 236 static std::unique_ptr<ToolOutputFile> GetOutputStream(const char *TargetName, 237 Triple::OSType OS, 238 const char *ProgName) { 239 // If we don't yet have an output filename, make one. 240 if (OutputFilename.empty()) { 241 if (InputFilename == "-") 242 OutputFilename = "-"; 243 else { 244 // If InputFilename ends in .bc or .ll, remove it. 245 StringRef IFN = InputFilename; 246 if (IFN.endswith(".bc") || IFN.endswith(".ll")) 247 OutputFilename = std::string(IFN.drop_back(3)); 248 else if (IFN.endswith(".mir")) 249 OutputFilename = std::string(IFN.drop_back(4)); 250 else 251 OutputFilename = std::string(IFN); 252 253 switch (codegen::getFileType()) { 254 case CGFT_AssemblyFile: 255 if (TargetName[0] == 'c') { 256 if (TargetName[1] == 0) 257 OutputFilename += ".cbe.c"; 258 else if (TargetName[1] == 'p' && TargetName[2] == 'p') 259 OutputFilename += ".cpp"; 260 else 261 OutputFilename += ".s"; 262 } else 263 OutputFilename += ".s"; 264 break; 265 case CGFT_ObjectFile: 266 if (OS == Triple::Win32) 267 OutputFilename += ".obj"; 268 else 269 OutputFilename += ".o"; 270 break; 271 case CGFT_Null: 272 OutputFilename = "-"; 273 break; 274 } 275 } 276 } 277 278 // Decide if we need "binary" output. 279 bool Binary = false; 280 switch (codegen::getFileType()) { 281 case CGFT_AssemblyFile: 282 break; 283 case CGFT_ObjectFile: 284 case CGFT_Null: 285 Binary = true; 286 break; 287 } 288 289 // Open the file. 290 std::error_code EC; 291 sys::fs::OpenFlags OpenFlags = sys::fs::OF_None; 292 if (!Binary) 293 OpenFlags |= sys::fs::OF_TextWithCRLF; 294 auto FDOut = std::make_unique<ToolOutputFile>(OutputFilename, EC, OpenFlags); 295 if (EC) { 296 reportError(EC.message()); 297 return nullptr; 298 } 299 300 return FDOut; 301 } 302 303 struct LLCDiagnosticHandler : public DiagnosticHandler { 304 bool *HasError; 305 LLCDiagnosticHandler(bool *HasErrorPtr) : HasError(HasErrorPtr) {} 306 bool handleDiagnostics(const DiagnosticInfo &DI) override { 307 if (DI.getKind() == llvm::DK_SrcMgr) { 308 const auto &DISM = cast<DiagnosticInfoSrcMgr>(DI); 309 const SMDiagnostic &SMD = DISM.getSMDiag(); 310 311 if (SMD.getKind() == SourceMgr::DK_Error) 312 *HasError = true; 313 314 SMD.print(nullptr, errs()); 315 316 // For testing purposes, we print the LocCookie here. 317 if (DISM.isInlineAsmDiag() && DISM.getLocCookie()) 318 WithColor::note() << "!srcloc = " << DISM.getLocCookie() << "\n"; 319 320 return true; 321 } 322 323 if (DI.getSeverity() == DS_Error) 324 *HasError = true; 325 326 if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI)) 327 if (!Remark->isEnabled()) 328 return true; 329 330 DiagnosticPrinterRawOStream DP(errs()); 331 errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": "; 332 DI.print(DP); 333 errs() << "\n"; 334 return true; 335 } 336 }; 337 338 // main - Entry point for the llc compiler. 339 // 340 int main(int argc, char **argv) { 341 InitLLVM X(argc, argv); 342 343 // Enable debug stream buffering. 344 EnableDebugBuffering = true; 345 346 // Initialize targets first, so that --version shows registered targets. 347 InitializeAllTargets(); 348 InitializeAllTargetMCs(); 349 InitializeAllAsmPrinters(); 350 InitializeAllAsmParsers(); 351 352 // Initialize codegen and IR passes used by llc so that the -print-after, 353 // -print-before, and -stop-after options work. 354 PassRegistry *Registry = PassRegistry::getPassRegistry(); 355 initializeCore(*Registry); 356 initializeCodeGen(*Registry); 357 initializeLoopStrengthReducePass(*Registry); 358 initializeLowerIntrinsicsPass(*Registry); 359 initializeEntryExitInstrumenterPass(*Registry); 360 initializePostInlineEntryExitInstrumenterPass(*Registry); 361 initializeUnreachableBlockElimLegacyPassPass(*Registry); 362 initializeConstantHoistingLegacyPassPass(*Registry); 363 initializeScalarOpts(*Registry); 364 initializeVectorization(*Registry); 365 initializeScalarizeMaskedMemIntrinLegacyPassPass(*Registry); 366 initializeExpandReductionsPass(*Registry); 367 initializeExpandVectorPredicationPass(*Registry); 368 initializeHardwareLoopsPass(*Registry); 369 initializeTransformUtils(*Registry); 370 initializeReplaceWithVeclibLegacyPass(*Registry); 371 initializeTLSVariableHoistLegacyPassPass(*Registry); 372 373 // Initialize debugging passes. 374 initializeScavengerTestPass(*Registry); 375 376 // Register the target printer for --version. 377 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion); 378 379 cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); 380 381 if (TimeTrace) 382 timeTraceProfilerInitialize(TimeTraceGranularity, argv[0]); 383 auto TimeTraceScopeExit = make_scope_exit([]() { 384 if (TimeTrace) { 385 if (auto E = timeTraceProfilerWrite(TimeTraceFile, OutputFilename)) { 386 handleAllErrors(std::move(E), [&](const StringError &SE) { 387 errs() << SE.getMessage() << "\n"; 388 }); 389 return; 390 } 391 timeTraceProfilerCleanup(); 392 } 393 }); 394 395 LLVMContext Context; 396 Context.setDiscardValueNames(DiscardValueNames); 397 398 // Set a diagnostic handler that doesn't exit on the first error 399 bool HasError = false; 400 Context.setDiagnosticHandler( 401 std::make_unique<LLCDiagnosticHandler>(&HasError)); 402 403 Expected<std::unique_ptr<ToolOutputFile>> RemarksFileOrErr = 404 setupLLVMOptimizationRemarks(Context, RemarksFilename, RemarksPasses, 405 RemarksFormat, RemarksWithHotness, 406 RemarksHotnessThreshold); 407 if (Error E = RemarksFileOrErr.takeError()) 408 reportError(std::move(E), RemarksFilename); 409 std::unique_ptr<ToolOutputFile> RemarksFile = std::move(*RemarksFileOrErr); 410 411 if (InputLanguage != "" && InputLanguage != "ir" && InputLanguage != "mir") 412 reportError("input language must be '', 'IR' or 'MIR'"); 413 414 // Compile the module TimeCompilations times to give better compile time 415 // metrics. 416 for (unsigned I = TimeCompilations; I; --I) 417 if (int RetVal = compileModule(argv, Context)) 418 return RetVal; 419 420 if (RemarksFile) 421 RemarksFile->keep(); 422 return 0; 423 } 424 425 static bool addPass(PassManagerBase &PM, const char *argv0, 426 StringRef PassName, TargetPassConfig &TPC) { 427 if (PassName == "none") 428 return false; 429 430 const PassRegistry *PR = PassRegistry::getPassRegistry(); 431 const PassInfo *PI = PR->getPassInfo(PassName); 432 if (!PI) { 433 WithColor::error(errs(), argv0) 434 << "run-pass " << PassName << " is not registered.\n"; 435 return true; 436 } 437 438 Pass *P; 439 if (PI->getNormalCtor()) 440 P = PI->getNormalCtor()(); 441 else { 442 WithColor::error(errs(), argv0) 443 << "cannot create pass: " << PI->getPassName() << "\n"; 444 return true; 445 } 446 std::string Banner = std::string("After ") + std::string(P->getPassName()); 447 TPC.addMachinePrePasses(); 448 PM.add(P); 449 TPC.addMachinePostPasses(Banner); 450 451 return false; 452 } 453 454 static int compileModule(char **argv, LLVMContext &Context) { 455 // Load the module to be compiled... 456 SMDiagnostic Err; 457 std::unique_ptr<Module> M; 458 std::unique_ptr<MIRParser> MIR; 459 Triple TheTriple; 460 std::string CPUStr = codegen::getCPUStr(), 461 FeaturesStr = codegen::getFeaturesStr(); 462 463 // Set attributes on functions as loaded from MIR from command line arguments. 464 auto setMIRFunctionAttributes = [&CPUStr, &FeaturesStr](Function &F) { 465 codegen::setFunctionAttributes(CPUStr, FeaturesStr, F); 466 }; 467 468 auto MAttrs = codegen::getMAttrs(); 469 bool SkipModule = codegen::getMCPU() == "help" || 470 (!MAttrs.empty() && MAttrs.front() == "help"); 471 472 CodeGenOpt::Level OLvl = CodeGenOpt::Default; 473 switch (OptLevel) { 474 default: 475 WithColor::error(errs(), argv[0]) << "invalid optimization level.\n"; 476 return 1; 477 case ' ': break; 478 case '0': OLvl = CodeGenOpt::None; break; 479 case '1': OLvl = CodeGenOpt::Less; break; 480 case '2': OLvl = CodeGenOpt::Default; break; 481 case '3': OLvl = CodeGenOpt::Aggressive; break; 482 } 483 484 // Parse 'none' or '$major.$minor'. Disallow -binutils-version=0 because we 485 // use that to indicate the MC default. 486 if (!BinutilsVersion.empty() && BinutilsVersion != "none") { 487 StringRef V = BinutilsVersion.getValue(); 488 unsigned Num; 489 if (V.consumeInteger(10, Num) || Num == 0 || 490 !(V.empty() || 491 (V.consume_front(".") && !V.consumeInteger(10, Num) && V.empty()))) { 492 WithColor::error(errs(), argv[0]) 493 << "invalid -binutils-version, accepting 'none' or major.minor\n"; 494 return 1; 495 } 496 } 497 TargetOptions Options; 498 auto InitializeOptions = [&](const Triple &TheTriple) { 499 Options = codegen::InitTargetOptionsFromCodeGenFlags(TheTriple); 500 Options.BinutilsVersion = 501 TargetMachine::parseBinutilsVersion(BinutilsVersion); 502 Options.DisableIntegratedAS = NoIntegratedAssembler; 503 Options.MCOptions.ShowMCEncoding = ShowMCEncoding; 504 Options.MCOptions.AsmVerbose = AsmVerbose; 505 Options.MCOptions.PreserveAsmComments = PreserveComments; 506 Options.MCOptions.IASSearchPaths = IncludeDirs; 507 Options.MCOptions.SplitDwarfFile = SplitDwarfFile; 508 if (DwarfDirectory.getPosition()) { 509 Options.MCOptions.MCUseDwarfDirectory = 510 DwarfDirectory ? MCTargetOptions::EnableDwarfDirectory 511 : MCTargetOptions::DisableDwarfDirectory; 512 } else { 513 // -dwarf-directory is not set explicitly. Some assemblers 514 // (e.g. GNU as or ptxas) do not support `.file directory' 515 // syntax prior to DWARFv5. Let the target decide the default 516 // value. 517 Options.MCOptions.MCUseDwarfDirectory = 518 MCTargetOptions::DefaultDwarfDirectory; 519 } 520 }; 521 522 Optional<Reloc::Model> RM = codegen::getExplicitRelocModel(); 523 Optional<CodeModel::Model> CM = codegen::getExplicitCodeModel(); 524 525 const Target *TheTarget = nullptr; 526 std::unique_ptr<TargetMachine> Target; 527 528 // If user just wants to list available options, skip module loading 529 if (!SkipModule) { 530 auto SetDataLayout = 531 [&](StringRef DataLayoutTargetTriple) -> Optional<std::string> { 532 // If we are supposed to override the target triple, do so now. 533 std::string IRTargetTriple = DataLayoutTargetTriple.str(); 534 if (!TargetTriple.empty()) 535 IRTargetTriple = Triple::normalize(TargetTriple); 536 TheTriple = Triple(IRTargetTriple); 537 if (TheTriple.getTriple().empty()) 538 TheTriple.setTriple(sys::getDefaultTargetTriple()); 539 540 std::string Error; 541 TheTarget = 542 TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error); 543 if (!TheTarget) { 544 WithColor::error(errs(), argv[0]) << Error; 545 exit(1); 546 } 547 548 // On AIX, setting the relocation model to anything other than PIC is 549 // considered a user error. 550 if (TheTriple.isOSAIX() && RM && *RM != Reloc::PIC_) 551 reportError("invalid relocation model, AIX only supports PIC", 552 InputFilename); 553 554 InitializeOptions(TheTriple); 555 Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine( 556 TheTriple.getTriple(), CPUStr, FeaturesStr, Options, RM, CM, OLvl)); 557 assert(Target && "Could not allocate target machine!"); 558 559 return Target->createDataLayout().getStringRepresentation(); 560 }; 561 if (InputLanguage == "mir" || 562 (InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) { 563 MIR = createMIRParserFromFile(InputFilename, Err, Context, 564 setMIRFunctionAttributes); 565 if (MIR) 566 M = MIR->parseIRModule(SetDataLayout); 567 } else { 568 M = parseIRFile(InputFilename, Err, Context, 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 Optional<CodeModel::Model> CM_IR = M->getCodeModel(); 578 if (!CM && CM_IR) 579 Target->setCodeModel(CM_IR.getValue()); 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 (!RunPassNames->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 : *RunPassNames) { 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