llc.cpp revision 321369
11541Srgrimes//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===// 21541Srgrimes// 31541Srgrimes// The LLVM Compiler Infrastructure 41541Srgrimes// 51541Srgrimes// This file is distributed under the University of Illinois Open Source 61541Srgrimes// License. See LICENSE.TXT for details. 71541Srgrimes// 81541Srgrimes//===----------------------------------------------------------------------===// 91541Srgrimes// 101541Srgrimes// This is the llc code generator driver. It provides a convenient 111541Srgrimes// command-line interface for generating native assembly-language code 121541Srgrimes// or C code, given LLVM bitcode. 131541Srgrimes// 141541Srgrimes//===----------------------------------------------------------------------===// 151541Srgrimes 161541Srgrimes 171541Srgrimes#include "llvm/ADT/STLExtras.h" 181541Srgrimes#include "llvm/ADT/Triple.h" 191541Srgrimes#include "llvm/Analysis/TargetLibraryInfo.h" 201541Srgrimes#include "llvm/CodeGen/CommandFlags.h" 211541Srgrimes#include "llvm/CodeGen/LinkAllAsmWriterComponents.h" 221541Srgrimes#include "llvm/CodeGen/LinkAllCodegenComponents.h" 231541Srgrimes#include "llvm/CodeGen/MIRParser/MIRParser.h" 241541Srgrimes#include "llvm/CodeGen/MachineFunctionPass.h" 251541Srgrimes#include "llvm/CodeGen/MachineModuleInfo.h" 261541Srgrimes#include "llvm/CodeGen/TargetPassConfig.h" 271541Srgrimes#include "llvm/IR/DataLayout.h" 281541Srgrimes#include "llvm/IR/DiagnosticInfo.h" 291541Srgrimes#include "llvm/IR/DiagnosticPrinter.h" 301541Srgrimes#include "llvm/IR/IRPrintingPasses.h" 311541Srgrimes#include "llvm/IR/LLVMContext.h" 321541Srgrimes#include "llvm/IR/LegacyPassManager.h" 331541Srgrimes#include "llvm/IR/Module.h" 346348Swollman#include "llvm/IR/Verifier.h" 351541Srgrimes#include "llvm/IRReader/IRReader.h" 361541Srgrimes#include "llvm/MC/SubtargetFeature.h" 372169Spaul#include "llvm/Pass.h" 382169Spaul#include "llvm/Support/CommandLine.h" 392169Spaul#include "llvm/Support/Debug.h" 401541Srgrimes#include "llvm/Support/FileSystem.h" 416247Swollman#include "llvm/Support/FormattedStream.h" 426247Swollman#include "llvm/Support/Host.h" 431541Srgrimes#include "llvm/Support/ManagedStatic.h" 441541Srgrimes#include "llvm/Support/PluginLoader.h" 451541Srgrimes#include "llvm/Support/PrettyStackTrace.h" 461541Srgrimes#include "llvm/Support/Signals.h" 471541Srgrimes#include "llvm/Support/SourceMgr.h" 481541Srgrimes#include "llvm/Support/TargetRegistry.h" 491541Srgrimes#include "llvm/Support/TargetSelect.h" 501541Srgrimes#include "llvm/Support/ToolOutputFile.h" 511541Srgrimes#include "llvm/Target/TargetMachine.h" 521541Srgrimes#include "llvm/Target/TargetSubtargetInfo.h" 531541Srgrimes#include "llvm/Transforms/Utils/Cloning.h" 541541Srgrimes#include <memory> 551541Srgrimesusing namespace llvm; 561541Srgrimes 571541Srgrimes// General options for llc. Other pass-specific options are specified 581541Srgrimes// within the corresponding llc passes, and target-specific options 591541Srgrimes// and back-end code generation options are specified with the target machine. 601541Srgrimes// 611541Srgrimesstatic cl::opt<std::string> 621541SrgrimesInputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-")); 631541Srgrimes 641541Srgrimesstatic cl::opt<std::string> 651541SrgrimesInputLanguage("x", cl::desc("Input language ('ir' or 'mir')")); 661541Srgrimes 676247Swollmanstatic cl::opt<std::string> 686348SwollmanOutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); 691541Srgrimes 701541Srgrimesstatic cl::opt<unsigned> 711541SrgrimesTimeCompilations("time-compilations", cl::Hidden, cl::init(1u), 721541Srgrimes cl::value_desc("N"), 731541Srgrimes cl::desc("Repeat compilation N times for timing")); 741541Srgrimes 751541Srgrimesstatic cl::opt<bool> 761541SrgrimesNoIntegratedAssembler("no-integrated-as", cl::Hidden, 771541Srgrimes cl::desc("Disable integrated assembler")); 781541Srgrimes 791541Srgrimesstatic cl::opt<bool> 801541Srgrimes PreserveComments("preserve-as-comments", cl::Hidden, 811541Srgrimes cl::desc("Preserve Comments in outputted assembly"), 821541Srgrimes cl::init(true)); 831541Srgrimes 841541Srgrimes// Determine optimization level. 851541Srgrimesstatic cl::opt<char> 866247SwollmanOptLevel("O", 871541Srgrimes cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " 881541Srgrimes "(default = '-O2')"), 896247Swollman cl::Prefix, 906247Swollman cl::ZeroOrMore, 916247Swollman cl::init(' ')); 926247Swollman 936247Swollmanstatic cl::opt<std::string> 946247SwollmanTargetTriple("mtriple", cl::desc("Override target triple for module")); 956247Swollman 966247Swollmanstatic cl::opt<std::string> SplitDwarfFile( 971541Srgrimes "split-dwarf-file", 981541Srgrimes cl::desc( 991541Srgrimes "Specify the name of the .dwo file to encode in the DWARF output")); 1001541Srgrimes 1011541Srgrimesstatic cl::opt<bool> NoVerify("disable-verify", cl::Hidden, 1021541Srgrimes cl::desc("Do not verify input module")); 1031541Srgrimes 1041541Srgrimesstatic cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls", 1051541Srgrimes cl::desc("Disable simplify-libcalls")); 1066247Swollman 1071541Srgrimesstatic cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden, 1081541Srgrimes cl::desc("Show encoding in .s output")); 1091541Srgrimes 1106247Swollmanstatic cl::opt<bool> EnableDwarfDirectory( 1116247Swollman "enable-dwarf-directory", cl::Hidden, 1126247Swollman cl::desc("Use .file directives with an explicit directory.")); 1136247Swollman 1141541Srgrimesstatic cl::opt<bool> AsmVerbose("asm-verbose", 1151541Srgrimes cl::desc("Add comments to directives."), 1161541Srgrimes cl::init(true)); 1171541Srgrimes 1181541Srgrimesstatic cl::opt<bool> 1196247Swollman CompileTwice("compile-twice", cl::Hidden, 1206247Swollman cl::desc("Run everything twice, re-using the same pass " 1212169Spaul "manager and verify the result is the same."), 1222169Spaul cl::init(false)); 123 124static cl::opt<bool> DiscardValueNames( 125 "discard-value-names", 126 cl::desc("Discard names from Value (other than GlobalValue)."), 127 cl::init(false), cl::Hidden); 128 129static cl::opt<std::string> StopBefore("stop-before", 130 cl::desc("Stop compilation before a specific pass"), 131 cl::value_desc("pass-name"), cl::init("")); 132 133static cl::opt<std::string> StopAfter("stop-after", 134 cl::desc("Stop compilation after a specific pass"), 135 cl::value_desc("pass-name"), cl::init("")); 136 137static cl::opt<std::string> StartBefore("start-before", 138 cl::desc("Resume compilation before a specific pass"), 139 cl::value_desc("pass-name"), cl::init("")); 140 141static cl::opt<std::string> StartAfter("start-after", 142 cl::desc("Resume compilation after a specific pass"), 143 cl::value_desc("pass-name"), cl::init("")); 144 145static cl::list<std::string> IncludeDirs("I", cl::desc("include search path")); 146 147static cl::opt<bool> PassRemarksWithHotness( 148 "pass-remarks-with-hotness", 149 cl::desc("With PGO, include profile count in optimization remarks"), 150 cl::Hidden); 151 152static cl::opt<unsigned> PassRemarksHotnessThreshold( 153 "pass-remarks-hotness-threshold", 154 cl::desc("Minimum profile count required for an optimization remark to be output"), 155 cl::Hidden); 156 157static cl::opt<std::string> 158 RemarksFilename("pass-remarks-output", 159 cl::desc("YAML output filename for pass remarks"), 160 cl::value_desc("filename")); 161 162namespace { 163static ManagedStatic<std::vector<std::string>> RunPassNames; 164 165struct RunPassOption { 166 void operator=(const std::string &Val) const { 167 if (Val.empty()) 168 return; 169 SmallVector<StringRef, 8> PassNames; 170 StringRef(Val).split(PassNames, ',', -1, false); 171 for (auto PassName : PassNames) 172 RunPassNames->push_back(PassName); 173 } 174}; 175} 176 177static RunPassOption RunPassOpt; 178 179static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass( 180 "run-pass", 181 cl::desc("Run compiler only for specified passes (comma separated list)"), 182 cl::value_desc("pass-name"), cl::ZeroOrMore, cl::location(RunPassOpt)); 183 184static int compileModule(char **, LLVMContext &); 185 186static std::unique_ptr<tool_output_file> 187GetOutputStream(const char *TargetName, Triple::OSType OS, 188 const char *ProgName) { 189 // If we don't yet have an output filename, make one. 190 if (OutputFilename.empty()) { 191 if (InputFilename == "-") 192 OutputFilename = "-"; 193 else { 194 // If InputFilename ends in .bc or .ll, remove it. 195 StringRef IFN = InputFilename; 196 if (IFN.endswith(".bc") || IFN.endswith(".ll")) 197 OutputFilename = IFN.drop_back(3); 198 else if (IFN.endswith(".mir")) 199 OutputFilename = IFN.drop_back(4); 200 else 201 OutputFilename = IFN; 202 203 switch (FileType) { 204 case TargetMachine::CGFT_AssemblyFile: 205 if (TargetName[0] == 'c') { 206 if (TargetName[1] == 0) 207 OutputFilename += ".cbe.c"; 208 else if (TargetName[1] == 'p' && TargetName[2] == 'p') 209 OutputFilename += ".cpp"; 210 else 211 OutputFilename += ".s"; 212 } else 213 OutputFilename += ".s"; 214 break; 215 case TargetMachine::CGFT_ObjectFile: 216 if (OS == Triple::Win32) 217 OutputFilename += ".obj"; 218 else 219 OutputFilename += ".o"; 220 break; 221 case TargetMachine::CGFT_Null: 222 OutputFilename += ".null"; 223 break; 224 } 225 } 226 } 227 228 // Decide if we need "binary" output. 229 bool Binary = false; 230 switch (FileType) { 231 case TargetMachine::CGFT_AssemblyFile: 232 break; 233 case TargetMachine::CGFT_ObjectFile: 234 case TargetMachine::CGFT_Null: 235 Binary = true; 236 break; 237 } 238 239 // Open the file. 240 std::error_code EC; 241 sys::fs::OpenFlags OpenFlags = sys::fs::F_None; 242 if (!Binary) 243 OpenFlags |= sys::fs::F_Text; 244 auto FDOut = llvm::make_unique<tool_output_file>(OutputFilename, EC, 245 OpenFlags); 246 if (EC) { 247 errs() << EC.message() << '\n'; 248 return nullptr; 249 } 250 251 return FDOut; 252} 253 254static void DiagnosticHandler(const DiagnosticInfo &DI, void *Context) { 255 bool *HasError = static_cast<bool *>(Context); 256 if (DI.getSeverity() == DS_Error) 257 *HasError = true; 258 259 if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI)) 260 if (!Remark->isEnabled()) 261 return; 262 263 DiagnosticPrinterRawOStream DP(errs()); 264 errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": "; 265 DI.print(DP); 266 errs() << "\n"; 267} 268 269static void InlineAsmDiagHandler(const SMDiagnostic &SMD, void *Context, 270 unsigned LocCookie) { 271 bool *HasError = static_cast<bool *>(Context); 272 if (SMD.getKind() == SourceMgr::DK_Error) 273 *HasError = true; 274 275 SMD.print(nullptr, errs()); 276 277 // For testing purposes, we print the LocCookie here. 278 if (LocCookie) 279 errs() << "note: !srcloc = " << LocCookie << "\n"; 280} 281 282// main - Entry point for the llc compiler. 283// 284int main(int argc, char **argv) { 285 sys::PrintStackTraceOnErrorSignal(argv[0]); 286 PrettyStackTraceProgram X(argc, argv); 287 288 // Enable debug stream buffering. 289 EnableDebugBuffering = true; 290 291 LLVMContext Context; 292 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 293 294 // Initialize targets first, so that --version shows registered targets. 295 InitializeAllTargets(); 296 InitializeAllTargetMCs(); 297 InitializeAllAsmPrinters(); 298 InitializeAllAsmParsers(); 299 300 // Initialize codegen and IR passes used by llc so that the -print-after, 301 // -print-before, and -stop-after options work. 302 PassRegistry *Registry = PassRegistry::getPassRegistry(); 303 initializeCore(*Registry); 304 initializeCodeGen(*Registry); 305 initializeLoopStrengthReducePass(*Registry); 306 initializeLowerIntrinsicsPass(*Registry); 307 initializeCountingFunctionInserterPass(*Registry); 308 initializeUnreachableBlockElimLegacyPassPass(*Registry); 309 initializeConstantHoistingLegacyPassPass(*Registry); 310 initializeScalarOpts(*Registry); 311 initializeVectorization(*Registry); 312 initializeScalarizeMaskedMemIntrinPass(*Registry); 313 initializeExpandReductionsPass(*Registry); 314 315 // Initialize debugging passes. 316 initializeScavengerTestPass(*Registry); 317 318 // Register the target printer for --version. 319 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion); 320 321 cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); 322 323 Context.setDiscardValueNames(DiscardValueNames); 324 325 // Set a diagnostic handler that doesn't exit on the first error 326 bool HasError = false; 327 Context.setDiagnosticHandler(DiagnosticHandler, &HasError); 328 Context.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, &HasError); 329 330 if (PassRemarksWithHotness) 331 Context.setDiagnosticsHotnessRequested(true); 332 333 if (PassRemarksHotnessThreshold) 334 Context.setDiagnosticsHotnessThreshold(PassRemarksHotnessThreshold); 335 336 std::unique_ptr<tool_output_file> YamlFile; 337 if (RemarksFilename != "") { 338 std::error_code EC; 339 YamlFile = llvm::make_unique<tool_output_file>(RemarksFilename, EC, 340 sys::fs::F_None); 341 if (EC) { 342 errs() << EC.message() << '\n'; 343 return 1; 344 } 345 Context.setDiagnosticsOutputFile( 346 llvm::make_unique<yaml::Output>(YamlFile->os())); 347 } 348 349 if (InputLanguage != "" && InputLanguage != "ir" && 350 InputLanguage != "mir") { 351 errs() << argv[0] << "Input language must be '', 'IR' or 'MIR'\n"; 352 return 1; 353 } 354 355 // Compile the module TimeCompilations times to give better compile time 356 // metrics. 357 for (unsigned I = TimeCompilations; I; --I) 358 if (int RetVal = compileModule(argv, Context)) 359 return RetVal; 360 361 if (YamlFile) 362 YamlFile->keep(); 363 return 0; 364} 365 366static bool addPass(PassManagerBase &PM, const char *argv0, 367 StringRef PassName, TargetPassConfig &TPC) { 368 if (PassName == "none") 369 return false; 370 371 const PassRegistry *PR = PassRegistry::getPassRegistry(); 372 const PassInfo *PI = PR->getPassInfo(PassName); 373 if (!PI) { 374 errs() << argv0 << ": run-pass " << PassName << " is not registered.\n"; 375 return true; 376 } 377 378 Pass *P; 379 if (PI->getNormalCtor()) 380 P = PI->getNormalCtor()(); 381 else { 382 errs() << argv0 << ": 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 392static AnalysisID getPassID(const char *argv0, const char *OptionName, 393 StringRef PassName) { 394 if (PassName.empty()) 395 return nullptr; 396 397 const PassRegistry &PR = *PassRegistry::getPassRegistry(); 398 const PassInfo *PI = PR.getPassInfo(PassName); 399 if (!PI) { 400 errs() << argv0 << ": " << OptionName << " pass is not registered.\n"; 401 exit(1); 402 } 403 return PI->getTypeInfo(); 404} 405 406static int compileModule(char **argv, LLVMContext &Context) { 407 // Load the module to be compiled... 408 SMDiagnostic Err; 409 std::unique_ptr<Module> M; 410 std::unique_ptr<MIRParser> MIR; 411 Triple TheTriple; 412 413 bool SkipModule = MCPU == "help" || 414 (!MAttrs.empty() && MAttrs.front() == "help"); 415 416 // If user just wants to list available options, skip module loading 417 if (!SkipModule) { 418 if (InputLanguage == "mir" || 419 (InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) { 420 MIR = createMIRParserFromFile(InputFilename, Err, Context); 421 if (MIR) 422 M = MIR->parseIRModule(); 423 } else 424 M = parseIRFile(InputFilename, Err, Context); 425 if (!M) { 426 Err.print(argv[0], errs()); 427 return 1; 428 } 429 430 // Verify module immediately to catch problems before doInitialization() is 431 // called on any passes. 432 if (!NoVerify && verifyModule(*M, &errs())) { 433 errs() << argv[0] << ": " << InputFilename 434 << ": error: input module is broken!\n"; 435 return 1; 436 } 437 438 // If we are supposed to override the target triple, do so now. 439 if (!TargetTriple.empty()) 440 M->setTargetTriple(Triple::normalize(TargetTriple)); 441 TheTriple = Triple(M->getTargetTriple()); 442 } else { 443 TheTriple = Triple(Triple::normalize(TargetTriple)); 444 } 445 446 if (TheTriple.getTriple().empty()) 447 TheTriple.setTriple(sys::getDefaultTargetTriple()); 448 449 // Get the target specific parser. 450 std::string Error; 451 const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple, 452 Error); 453 if (!TheTarget) { 454 errs() << argv[0] << ": " << Error; 455 return 1; 456 } 457 458 std::string CPUStr = getCPUStr(), FeaturesStr = getFeaturesStr(); 459 460 CodeGenOpt::Level OLvl = CodeGenOpt::Default; 461 switch (OptLevel) { 462 default: 463 errs() << argv[0] << ": invalid optimization level.\n"; 464 return 1; 465 case ' ': break; 466 case '0': OLvl = CodeGenOpt::None; break; 467 case '1': OLvl = CodeGenOpt::Less; break; 468 case '2': OLvl = CodeGenOpt::Default; break; 469 case '3': OLvl = CodeGenOpt::Aggressive; break; 470 } 471 472 TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 473 Options.DisableIntegratedAS = NoIntegratedAssembler; 474 Options.MCOptions.ShowMCEncoding = ShowMCEncoding; 475 Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory; 476 Options.MCOptions.AsmVerbose = AsmVerbose; 477 Options.MCOptions.PreserveAsmComments = PreserveComments; 478 Options.MCOptions.IASSearchPaths = IncludeDirs; 479 Options.MCOptions.SplitDwarfFile = SplitDwarfFile; 480 481 std::unique_ptr<TargetMachine> Target( 482 TheTarget->createTargetMachine(TheTriple.getTriple(), CPUStr, FeaturesStr, 483 Options, getRelocModel(), CMModel, OLvl)); 484 485 assert(Target && "Could not allocate target machine!"); 486 487 // If we don't have a module then just exit now. We do this down 488 // here since the CPU/Feature help is underneath the target machine 489 // creation. 490 if (SkipModule) 491 return 0; 492 493 assert(M && "Should have exited if we didn't have a module!"); 494 if (FloatABIForCalls != FloatABI::Default) 495 Options.FloatABIType = FloatABIForCalls; 496 497 // Figure out where we are going to send the output. 498 std::unique_ptr<tool_output_file> Out = 499 GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]); 500 if (!Out) return 1; 501 502 // Build up all of the passes that we want to do to the module. 503 legacy::PassManager PM; 504 505 // Add an appropriate TargetLibraryInfo pass for the module's triple. 506 TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple())); 507 508 // The -disable-simplify-libcalls flag actually disables all builtin optzns. 509 if (DisableSimplifyLibCalls) 510 TLII.disableAllFunctions(); 511 PM.add(new TargetLibraryInfoWrapperPass(TLII)); 512 513 // Add the target data from the target machine, if it exists, or the module. 514 M->setDataLayout(Target->createDataLayout()); 515 516 // Override function attributes based on CPUStr, FeaturesStr, and command line 517 // flags. 518 setFunctionAttributes(CPUStr, FeaturesStr, *M); 519 520 if (RelaxAll.getNumOccurrences() > 0 && 521 FileType != TargetMachine::CGFT_ObjectFile) 522 errs() << argv[0] 523 << ": warning: ignoring -mc-relax-all because filetype != obj"; 524 525 { 526 raw_pwrite_stream *OS = &Out->os(); 527 528 // Manually do the buffering rather than using buffer_ostream, 529 // so we can memcmp the contents in CompileTwice mode 530 SmallVector<char, 0> Buffer; 531 std::unique_ptr<raw_svector_ostream> BOS; 532 if ((FileType != TargetMachine::CGFT_AssemblyFile && 533 !Out->os().supportsSeeking()) || 534 CompileTwice) { 535 BOS = make_unique<raw_svector_ostream>(Buffer); 536 OS = BOS.get(); 537 } 538 539 const char *argv0 = argv[0]; 540 AnalysisID StartBeforeID = getPassID(argv0, "start-before", StartBefore); 541 AnalysisID StartAfterID = getPassID(argv0, "start-after", StartAfter); 542 AnalysisID StopAfterID = getPassID(argv0, "stop-after", StopAfter); 543 AnalysisID StopBeforeID = getPassID(argv0, "stop-before", StopBefore); 544 if (StartBeforeID && StartAfterID) { 545 errs() << argv0 << ": -start-before and -start-after specified!\n"; 546 return 1; 547 } 548 if (StopBeforeID && StopAfterID) { 549 errs() << argv0 << ": -stop-before and -stop-after specified!\n"; 550 return 1; 551 } 552 553 if (MIR) { 554 // Construct a custom pass pipeline that starts after instruction 555 // selection. 556 LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine&>(*Target); 557 TargetPassConfig &TPC = *LLVMTM.createPassConfig(PM); 558 TPC.setDisableVerify(NoVerify); 559 PM.add(&TPC); 560 MachineModuleInfo *MMI = new MachineModuleInfo(&LLVMTM); 561 if (MIR->parseMachineFunctions(*M, *MMI)) 562 return 1; 563 PM.add(MMI); 564 TPC.printAndVerify(""); 565 566 if (!RunPassNames->empty()) { 567 if (!StartAfter.empty() || !StopAfter.empty() || !StartBefore.empty() || 568 !StopBefore.empty()) { 569 errs() << argv0 << ": start-after and/or stop-after passes are " 570 "redundant when run-pass is specified.\n"; 571 return 1; 572 } 573 574 for (const std::string &RunPassName : *RunPassNames) { 575 if (addPass(PM, argv0, RunPassName, TPC)) 576 return 1; 577 } 578 } else { 579 TPC.setStartStopPasses(StartBeforeID, StartAfterID, StopBeforeID, 580 StopAfterID); 581 TPC.addISelPasses(); 582 TPC.addMachinePasses(); 583 } 584 TPC.setInitialized(); 585 586 if (!StopBefore.empty() || !StopAfter.empty() || !RunPassNames->empty()) { 587 PM.add(createPrintMIRPass(*OS)); 588 } else if (LLVMTM.addAsmPrinter(PM, *OS, FileType, MMI->getContext())) { 589 errs() << argv0 << ": target does not support generation of this" 590 << " file type!\n"; 591 return 1; 592 } 593 PM.add(createFreeMachineFunctionPass()); 594 } else if (Target->addPassesToEmitFile(PM, *OS, FileType, NoVerify, 595 StartBeforeID, StartAfterID, 596 StopBeforeID, StopAfterID)) { 597 errs() << argv0 << ": target does not support generation of this" 598 << " file type!\n"; 599 return 1; 600 } 601 602 // Before executing passes, print the final values of the LLVM options. 603 cl::PrintOptionValues(); 604 605 // If requested, run the pass manager over the same module again, 606 // to catch any bugs due to persistent state in the passes. Note that 607 // opt has the same functionality, so it may be worth abstracting this out 608 // in the future. 609 SmallVector<char, 0> CompileTwiceBuffer; 610 if (CompileTwice) { 611 std::unique_ptr<Module> M2(llvm::CloneModule(M.get())); 612 PM.run(*M2); 613 CompileTwiceBuffer = Buffer; 614 Buffer.clear(); 615 } 616 617 PM.run(*M); 618 619 auto HasError = *static_cast<bool *>(Context.getDiagnosticContext()); 620 if (HasError) 621 return 1; 622 623 // Compare the two outputs and make sure they're the same 624 if (CompileTwice) { 625 if (Buffer.size() != CompileTwiceBuffer.size() || 626 (memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) != 627 0)) { 628 errs() 629 << "Running the pass manager twice changed the output.\n" 630 "Writing the result of the second run to the specified output\n" 631 "To generate the one-run comparison binary, just run without\n" 632 "the compile-twice option\n"; 633 Out->os() << Buffer; 634 Out->keep(); 635 return 1; 636 } 637 } 638 639 if (BOS) { 640 Out->os() << Buffer; 641 } 642 } 643 644 // Declare success. 645 Out->keep(); 646 647 return 0; 648} 649