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/Triple.h" 17 #include "llvm/Analysis/TargetLibraryInfo.h" 18 #include "llvm/CodeGen/CommandFlags.inc" 19 #include "llvm/CodeGen/LinkAllAsmWriterComponents.h" 20 #include "llvm/CodeGen/LinkAllCodegenComponents.h" 21 #include "llvm/CodeGen/MIRParser/MIRParser.h" 22 #include "llvm/CodeGen/MachineFunctionPass.h" 23 #include "llvm/CodeGen/MachineModuleInfo.h" 24 #include "llvm/CodeGen/TargetPassConfig.h" 25 #include "llvm/CodeGen/TargetSubtargetInfo.h" 26 #include "llvm/IR/AutoUpgrade.h" 27 #include "llvm/IR/DataLayout.h" 28 #include "llvm/IR/DiagnosticInfo.h" 29 #include "llvm/IR/DiagnosticPrinter.h" 30 #include "llvm/IR/IRPrintingPasses.h" 31 #include "llvm/IR/LLVMContext.h" 32 #include "llvm/IR/LegacyPassManager.h" 33 #include "llvm/IR/Module.h" 34 #include "llvm/IR/RemarkStreamer.h" 35 #include "llvm/IR/Verifier.h" 36 #include "llvm/IRReader/IRReader.h" 37 #include "llvm/InitializePasses.h" 38 #include "llvm/MC/SubtargetFeature.h" 39 #include "llvm/Pass.h" 40 #include "llvm/Support/CommandLine.h" 41 #include "llvm/Support/Debug.h" 42 #include "llvm/Support/FileSystem.h" 43 #include "llvm/Support/FormattedStream.h" 44 #include "llvm/Support/Host.h" 45 #include "llvm/Support/InitLLVM.h" 46 #include "llvm/Support/ManagedStatic.h" 47 #include "llvm/Support/PluginLoader.h" 48 #include "llvm/Support/SourceMgr.h" 49 #include "llvm/Support/TargetRegistry.h" 50 #include "llvm/Support/TargetSelect.h" 51 #include "llvm/Support/ToolOutputFile.h" 52 #include "llvm/Support/WithColor.h" 53 #include "llvm/Target/TargetMachine.h" 54 #include "llvm/Transforms/Utils/Cloning.h" 55 #include <memory> 56 using namespace llvm; 57 58 // General options for llc. Other pass-specific options are specified 59 // within the corresponding llc passes, and target-specific options 60 // and back-end code generation options are specified with the target machine. 61 // 62 static cl::opt<std::string> 63 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-")); 64 65 static cl::opt<std::string> 66 InputLanguage("x", cl::desc("Input language ('ir' or 'mir')")); 67 68 static cl::opt<std::string> 69 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); 70 71 static cl::opt<std::string> 72 SplitDwarfOutputFile("split-dwarf-output", 73 cl::desc(".dwo output filename"), 74 cl::value_desc("filename")); 75 76 static cl::opt<unsigned> 77 TimeCompilations("time-compilations", cl::Hidden, cl::init(1u), 78 cl::value_desc("N"), 79 cl::desc("Repeat compilation N times for timing")); 80 81 static cl::opt<bool> 82 NoIntegratedAssembler("no-integrated-as", cl::Hidden, 83 cl::desc("Disable integrated assembler")); 84 85 static cl::opt<bool> 86 PreserveComments("preserve-as-comments", cl::Hidden, 87 cl::desc("Preserve Comments in outputted assembly"), 88 cl::init(true)); 89 90 // Determine optimization level. 91 static cl::opt<char> 92 OptLevel("O", 93 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " 94 "(default = '-O2')"), 95 cl::Prefix, 96 cl::ZeroOrMore, 97 cl::init(' ')); 98 99 static cl::opt<std::string> 100 TargetTriple("mtriple", cl::desc("Override target triple for module")); 101 102 static cl::opt<std::string> SplitDwarfFile( 103 "split-dwarf-file", 104 cl::desc( 105 "Specify the name of the .dwo file to encode in the DWARF output")); 106 107 static cl::opt<bool> NoVerify("disable-verify", cl::Hidden, 108 cl::desc("Do not verify input module")); 109 110 static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls", 111 cl::desc("Disable simplify-libcalls")); 112 113 static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden, 114 cl::desc("Show encoding in .s output")); 115 116 static cl::opt<bool> EnableDwarfDirectory( 117 "enable-dwarf-directory", cl::Hidden, 118 cl::desc("Use .file directives with an explicit directory.")); 119 120 static cl::opt<bool> AsmVerbose("asm-verbose", 121 cl::desc("Add comments to directives."), 122 cl::init(true)); 123 124 static cl::opt<bool> 125 CompileTwice("compile-twice", cl::Hidden, 126 cl::desc("Run everything twice, re-using the same pass " 127 "manager and verify the result is the same."), 128 cl::init(false)); 129 130 static cl::opt<bool> DiscardValueNames( 131 "discard-value-names", 132 cl::desc("Discard names from Value (other than GlobalValue)."), 133 cl::init(false), cl::Hidden); 134 135 static cl::list<std::string> IncludeDirs("I", cl::desc("include search path")); 136 137 static cl::opt<bool> RemarksWithHotness( 138 "pass-remarks-with-hotness", 139 cl::desc("With PGO, include profile count in optimization remarks"), 140 cl::Hidden); 141 142 static cl::opt<unsigned> 143 RemarksHotnessThreshold("pass-remarks-hotness-threshold", 144 cl::desc("Minimum profile count required for " 145 "an optimization remark to be output"), 146 cl::Hidden); 147 148 static cl::opt<std::string> 149 RemarksFilename("pass-remarks-output", 150 cl::desc("Output filename for pass remarks"), 151 cl::value_desc("filename")); 152 153 static cl::opt<std::string> 154 RemarksPasses("pass-remarks-filter", 155 cl::desc("Only record optimization remarks from passes whose " 156 "names match the given regular expression"), 157 cl::value_desc("regex")); 158 159 static cl::opt<std::string> RemarksFormat( 160 "pass-remarks-format", 161 cl::desc("The format used for serializing remarks (default: YAML)"), 162 cl::value_desc("format"), cl::init("yaml")); 163 164 namespace { 165 static ManagedStatic<std::vector<std::string>> RunPassNames; 166 167 struct RunPassOption { 168 void operator=(const std::string &Val) const { 169 if (Val.empty()) 170 return; 171 SmallVector<StringRef, 8> PassNames; 172 StringRef(Val).split(PassNames, ',', -1, false); 173 for (auto PassName : PassNames) 174 RunPassNames->push_back(PassName); 175 } 176 }; 177 } 178 179 static RunPassOption RunPassOpt; 180 181 static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass( 182 "run-pass", 183 cl::desc("Run compiler only for specified passes (comma separated list)"), 184 cl::value_desc("pass-name"), cl::ZeroOrMore, cl::location(RunPassOpt)); 185 186 static int compileModule(char **, LLVMContext &); 187 188 static std::unique_ptr<ToolOutputFile> GetOutputStream(const char *TargetName, 189 Triple::OSType OS, 190 const char *ProgName) { 191 // If we don't yet have an output filename, make one. 192 if (OutputFilename.empty()) { 193 if (InputFilename == "-") 194 OutputFilename = "-"; 195 else { 196 // If InputFilename ends in .bc or .ll, remove it. 197 StringRef IFN = InputFilename; 198 if (IFN.endswith(".bc") || IFN.endswith(".ll")) 199 OutputFilename = IFN.drop_back(3); 200 else if (IFN.endswith(".mir")) 201 OutputFilename = IFN.drop_back(4); 202 else 203 OutputFilename = IFN; 204 205 switch (FileType) { 206 case CGFT_AssemblyFile: 207 if (TargetName[0] == 'c') { 208 if (TargetName[1] == 0) 209 OutputFilename += ".cbe.c"; 210 else if (TargetName[1] == 'p' && TargetName[2] == 'p') 211 OutputFilename += ".cpp"; 212 else 213 OutputFilename += ".s"; 214 } else 215 OutputFilename += ".s"; 216 break; 217 case CGFT_ObjectFile: 218 if (OS == Triple::Win32) 219 OutputFilename += ".obj"; 220 else 221 OutputFilename += ".o"; 222 break; 223 case CGFT_Null: 224 OutputFilename += ".null"; 225 break; 226 } 227 } 228 } 229 230 // Decide if we need "binary" output. 231 bool Binary = false; 232 switch (FileType) { 233 case CGFT_AssemblyFile: 234 break; 235 case CGFT_ObjectFile: 236 case CGFT_Null: 237 Binary = true; 238 break; 239 } 240 241 // Open the file. 242 std::error_code EC; 243 sys::fs::OpenFlags OpenFlags = sys::fs::OF_None; 244 if (!Binary) 245 OpenFlags |= sys::fs::OF_Text; 246 auto FDOut = std::make_unique<ToolOutputFile>(OutputFilename, EC, OpenFlags); 247 if (EC) { 248 WithColor::error() << EC.message() << '\n'; 249 return nullptr; 250 } 251 252 return FDOut; 253 } 254 255 struct LLCDiagnosticHandler : public DiagnosticHandler { 256 bool *HasError; 257 LLCDiagnosticHandler(bool *HasErrorPtr) : HasError(HasErrorPtr) {} 258 bool handleDiagnostics(const DiagnosticInfo &DI) override { 259 if (DI.getSeverity() == DS_Error) 260 *HasError = true; 261 262 if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI)) 263 if (!Remark->isEnabled()) 264 return true; 265 266 DiagnosticPrinterRawOStream DP(errs()); 267 errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": "; 268 DI.print(DP); 269 errs() << "\n"; 270 return true; 271 } 272 }; 273 274 static void InlineAsmDiagHandler(const SMDiagnostic &SMD, void *Context, 275 unsigned LocCookie) { 276 bool *HasError = static_cast<bool *>(Context); 277 if (SMD.getKind() == SourceMgr::DK_Error) 278 *HasError = true; 279 280 SMD.print(nullptr, errs()); 281 282 // For testing purposes, we print the LocCookie here. 283 if (LocCookie) 284 WithColor::note() << "!srcloc = " << LocCookie << "\n"; 285 } 286 287 // main - Entry point for the llc compiler. 288 // 289 int main(int argc, char **argv) { 290 InitLLVM X(argc, argv); 291 292 // Enable debug stream buffering. 293 EnableDebugBuffering = true; 294 295 LLVMContext Context; 296 297 // Initialize targets first, so that --version shows registered targets. 298 InitializeAllTargets(); 299 InitializeAllTargetMCs(); 300 InitializeAllAsmPrinters(); 301 InitializeAllAsmParsers(); 302 303 // Initialize codegen and IR passes used by llc so that the -print-after, 304 // -print-before, and -stop-after options work. 305 PassRegistry *Registry = PassRegistry::getPassRegistry(); 306 initializeCore(*Registry); 307 initializeCodeGen(*Registry); 308 initializeLoopStrengthReducePass(*Registry); 309 initializeLowerIntrinsicsPass(*Registry); 310 initializeEntryExitInstrumenterPass(*Registry); 311 initializePostInlineEntryExitInstrumenterPass(*Registry); 312 initializeUnreachableBlockElimLegacyPassPass(*Registry); 313 initializeConstantHoistingLegacyPassPass(*Registry); 314 initializeScalarOpts(*Registry); 315 initializeVectorization(*Registry); 316 initializeScalarizeMaskedMemIntrinPass(*Registry); 317 initializeExpandReductionsPass(*Registry); 318 initializeHardwareLoopsPass(*Registry); 319 320 // Initialize debugging passes. 321 initializeScavengerTestPass(*Registry); 322 323 // Register the target printer for --version. 324 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion); 325 326 cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); 327 328 Context.setDiscardValueNames(DiscardValueNames); 329 330 // Set a diagnostic handler that doesn't exit on the first error 331 bool HasError = false; 332 Context.setDiagnosticHandler( 333 std::make_unique<LLCDiagnosticHandler>(&HasError)); 334 Context.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, &HasError); 335 336 Expected<std::unique_ptr<ToolOutputFile>> RemarksFileOrErr = 337 setupOptimizationRemarks(Context, RemarksFilename, RemarksPasses, 338 RemarksFormat, RemarksWithHotness, 339 RemarksHotnessThreshold); 340 if (Error E = RemarksFileOrErr.takeError()) { 341 WithColor::error(errs(), argv[0]) << toString(std::move(E)) << '\n'; 342 return 1; 343 } 344 std::unique_ptr<ToolOutputFile> RemarksFile = std::move(*RemarksFileOrErr); 345 346 if (InputLanguage != "" && InputLanguage != "ir" && 347 InputLanguage != "mir") { 348 WithColor::error(errs(), argv[0]) 349 << "input language must be '', 'IR' or 'MIR'\n"; 350 return 1; 351 } 352 353 // Compile the module TimeCompilations times to give better compile time 354 // metrics. 355 for (unsigned I = TimeCompilations; I; --I) 356 if (int RetVal = compileModule(argv, Context)) 357 return RetVal; 358 359 if (RemarksFile) 360 RemarksFile->keep(); 361 return 0; 362 } 363 364 static bool addPass(PassManagerBase &PM, const char *argv0, 365 StringRef PassName, TargetPassConfig &TPC) { 366 if (PassName == "none") 367 return false; 368 369 const PassRegistry *PR = PassRegistry::getPassRegistry(); 370 const PassInfo *PI = PR->getPassInfo(PassName); 371 if (!PI) { 372 WithColor::error(errs(), argv0) 373 << "run-pass " << PassName << " is not registered.\n"; 374 return true; 375 } 376 377 Pass *P; 378 if (PI->getNormalCtor()) 379 P = PI->getNormalCtor()(); 380 else { 381 WithColor::error(errs(), argv0) 382 << "cannot create pass: " << PI->getPassName() << "\n"; 383 return true; 384 } 385 std::string Banner = std::string("After ") + std::string(P->getPassName()); 386 PM.add(P); 387 TPC.printAndVerify(Banner); 388 389 return false; 390 } 391 392 static int compileModule(char **argv, LLVMContext &Context) { 393 // Load the module to be compiled... 394 SMDiagnostic Err; 395 std::unique_ptr<Module> M; 396 std::unique_ptr<MIRParser> MIR; 397 Triple TheTriple; 398 std::string CPUStr = getCPUStr(), FeaturesStr = getFeaturesStr(); 399 400 // Set attributes on functions as loaded from MIR from command line arguments. 401 auto setMIRFunctionAttributes = [&CPUStr, &FeaturesStr](Function &F) { 402 setFunctionAttributes(CPUStr, FeaturesStr, F); 403 }; 404 405 bool SkipModule = MCPU == "help" || 406 (!MAttrs.empty() && MAttrs.front() == "help"); 407 408 // If user just wants to list available options, skip module loading 409 if (!SkipModule) { 410 if (InputLanguage == "mir" || 411 (InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) { 412 MIR = createMIRParserFromFile(InputFilename, Err, Context, 413 setMIRFunctionAttributes); 414 if (MIR) 415 M = MIR->parseIRModule(); 416 } else 417 M = parseIRFile(InputFilename, Err, Context, false); 418 if (!M) { 419 Err.print(argv[0], WithColor::error(errs(), argv[0])); 420 return 1; 421 } 422 423 // If we are supposed to override the target triple, do so now. 424 if (!TargetTriple.empty()) 425 M->setTargetTriple(Triple::normalize(TargetTriple)); 426 TheTriple = Triple(M->getTargetTriple()); 427 } else { 428 TheTriple = Triple(Triple::normalize(TargetTriple)); 429 } 430 431 if (TheTriple.getTriple().empty()) 432 TheTriple.setTriple(sys::getDefaultTargetTriple()); 433 434 // Get the target specific parser. 435 std::string Error; 436 const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple, 437 Error); 438 if (!TheTarget) { 439 WithColor::error(errs(), argv[0]) << Error; 440 return 1; 441 } 442 443 CodeGenOpt::Level OLvl = CodeGenOpt::Default; 444 switch (OptLevel) { 445 default: 446 WithColor::error(errs(), argv[0]) << "invalid optimization level.\n"; 447 return 1; 448 case ' ': break; 449 case '0': OLvl = CodeGenOpt::None; break; 450 case '1': OLvl = CodeGenOpt::Less; break; 451 case '2': OLvl = CodeGenOpt::Default; break; 452 case '3': OLvl = CodeGenOpt::Aggressive; break; 453 } 454 455 TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 456 Options.DisableIntegratedAS = NoIntegratedAssembler; 457 Options.MCOptions.ShowMCEncoding = ShowMCEncoding; 458 Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory; 459 Options.MCOptions.AsmVerbose = AsmVerbose; 460 Options.MCOptions.PreserveAsmComments = PreserveComments; 461 Options.MCOptions.IASSearchPaths = IncludeDirs; 462 Options.MCOptions.SplitDwarfFile = SplitDwarfFile; 463 464 std::unique_ptr<TargetMachine> Target(TheTarget->createTargetMachine( 465 TheTriple.getTriple(), CPUStr, FeaturesStr, Options, getRelocModel(), 466 getCodeModel(), OLvl)); 467 468 assert(Target && "Could not allocate target machine!"); 469 470 // If we don't have a module then just exit now. We do this down 471 // here since the CPU/Feature help is underneath the target machine 472 // creation. 473 if (SkipModule) 474 return 0; 475 476 assert(M && "Should have exited if we didn't have a module!"); 477 if (FloatABIForCalls != FloatABI::Default) 478 Options.FloatABIType = FloatABIForCalls; 479 480 // Figure out where we are going to send the output. 481 std::unique_ptr<ToolOutputFile> Out = 482 GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]); 483 if (!Out) return 1; 484 485 std::unique_ptr<ToolOutputFile> DwoOut; 486 if (!SplitDwarfOutputFile.empty()) { 487 std::error_code EC; 488 DwoOut = std::make_unique<ToolOutputFile>(SplitDwarfOutputFile, EC, 489 sys::fs::OF_None); 490 if (EC) { 491 WithColor::error(errs(), argv[0]) << EC.message() << '\n'; 492 return 1; 493 } 494 } 495 496 // Build up all of the passes that we want to do to the module. 497 legacy::PassManager PM; 498 499 // Add an appropriate TargetLibraryInfo pass for the module's triple. 500 TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple())); 501 502 // The -disable-simplify-libcalls flag actually disables all builtin optzns. 503 if (DisableSimplifyLibCalls) 504 TLII.disableAllFunctions(); 505 PM.add(new TargetLibraryInfoWrapperPass(TLII)); 506 507 // Add the target data from the target machine, if it exists, or the module. 508 M->setDataLayout(Target->createDataLayout()); 509 510 // This needs to be done after setting datalayout since it calls verifier 511 // to check debug info whereas verifier relies on correct datalayout. 512 UpgradeDebugInfo(*M); 513 514 // Verify module immediately to catch problems before doInitialization() is 515 // called on any passes. 516 if (!NoVerify && verifyModule(*M, &errs())) { 517 std::string Prefix = 518 (Twine(argv[0]) + Twine(": ") + Twine(InputFilename)).str(); 519 WithColor::error(errs(), Prefix) << "input module is broken!\n"; 520 return 1; 521 } 522 523 // Override function attributes based on CPUStr, FeaturesStr, and command line 524 // flags. 525 setFunctionAttributes(CPUStr, FeaturesStr, *M); 526 527 if (RelaxAll.getNumOccurrences() > 0 && 528 FileType != CGFT_ObjectFile) 529 WithColor::warning(errs(), argv[0]) 530 << ": warning: ignoring -mc-relax-all because filetype != obj"; 531 532 { 533 raw_pwrite_stream *OS = &Out->os(); 534 535 // Manually do the buffering rather than using buffer_ostream, 536 // so we can memcmp the contents in CompileTwice mode 537 SmallVector<char, 0> Buffer; 538 std::unique_ptr<raw_svector_ostream> BOS; 539 if ((FileType != CGFT_AssemblyFile && 540 !Out->os().supportsSeeking()) || 541 CompileTwice) { 542 BOS = std::make_unique<raw_svector_ostream>(Buffer); 543 OS = BOS.get(); 544 } 545 546 const char *argv0 = argv[0]; 547 LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine &>(*Target); 548 MachineModuleInfoWrapperPass *MMIWP = 549 new MachineModuleInfoWrapperPass(&LLVMTM); 550 551 // Construct a custom pass pipeline that starts after instruction 552 // selection. 553 if (!RunPassNames->empty()) { 554 if (!MIR) { 555 WithColor::warning(errs(), argv[0]) 556 << "run-pass is for .mir file only.\n"; 557 return 1; 558 } 559 TargetPassConfig &TPC = *LLVMTM.createPassConfig(PM); 560 if (TPC.hasLimitedCodeGenPipeline()) { 561 WithColor::warning(errs(), argv[0]) 562 << "run-pass cannot be used with " 563 << TPC.getLimitedCodeGenPipelineReason(" and ") << ".\n"; 564 return 1; 565 } 566 567 TPC.setDisableVerify(NoVerify); 568 PM.add(&TPC); 569 PM.add(MMIWP); 570 TPC.printAndVerify(""); 571 for (const std::string &RunPassName : *RunPassNames) { 572 if (addPass(PM, argv0, RunPassName, TPC)) 573 return 1; 574 } 575 TPC.setInitialized(); 576 PM.add(createPrintMIRPass(*OS)); 577 PM.add(createFreeMachineFunctionPass()); 578 } else if (Target->addPassesToEmitFile(PM, *OS, 579 DwoOut ? &DwoOut->os() : nullptr, 580 FileType, NoVerify, MMIWP)) { 581 WithColor::warning(errs(), argv[0]) 582 << "target does not support generation of this" 583 << " file type!\n"; 584 return 1; 585 } 586 587 if (MIR) { 588 assert(MMIWP && "Forgot to create MMIWP?"); 589 if (MIR->parseMachineFunctions(*M, MMIWP->getMMI())) 590 return 1; 591 } 592 593 // Before executing passes, print the final values of the LLVM options. 594 cl::PrintOptionValues(); 595 596 // If requested, run the pass manager over the same module again, 597 // to catch any bugs due to persistent state in the passes. Note that 598 // opt has the same functionality, so it may be worth abstracting this out 599 // in the future. 600 SmallVector<char, 0> CompileTwiceBuffer; 601 if (CompileTwice) { 602 std::unique_ptr<Module> M2(llvm::CloneModule(*M)); 603 PM.run(*M2); 604 CompileTwiceBuffer = Buffer; 605 Buffer.clear(); 606 } 607 608 PM.run(*M); 609 610 auto HasError = 611 ((const LLCDiagnosticHandler *)(Context.getDiagHandlerPtr()))->HasError; 612 if (*HasError) 613 return 1; 614 615 // Compare the two outputs and make sure they're the same 616 if (CompileTwice) { 617 if (Buffer.size() != CompileTwiceBuffer.size() || 618 (memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) != 619 0)) { 620 errs() 621 << "Running the pass manager twice changed the output.\n" 622 "Writing the result of the second run to the specified output\n" 623 "To generate the one-run comparison binary, just run without\n" 624 "the compile-twice option\n"; 625 Out->os() << Buffer; 626 Out->keep(); 627 return 1; 628 } 629 } 630 631 if (BOS) { 632 Out->os() << Buffer; 633 } 634 } 635 636 // Declare success. 637 Out->keep(); 638 if (DwoOut) 639 DwoOut->keep(); 640 641 return 0; 642 } 643