877 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8//9// This is the llc code generator driver. It provides a convenient10// command-line interface for generating an assembly file or a relocatable file,11// given LLVM bitcode.12//13//===----------------------------------------------------------------------===//14 15#include "NewPMDriver.h"16#include "llvm/ADT/STLExtras.h"17#include "llvm/ADT/ScopeExit.h"18#include "llvm/ADT/Statistic.h"19#include "llvm/Analysis/TargetLibraryInfo.h"20#include "llvm/CodeGen/CommandFlags.h"21#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"22#include "llvm/CodeGen/LinkAllCodegenComponents.h"23#include "llvm/CodeGen/MIRParser/MIRParser.h"24#include "llvm/CodeGen/MachineFunctionPass.h"25#include "llvm/CodeGen/MachineModuleInfo.h"26#include "llvm/CodeGen/TargetPassConfig.h"27#include "llvm/CodeGen/TargetSubtargetInfo.h"28#include "llvm/IR/AutoUpgrade.h"29#include "llvm/IR/DataLayout.h"30#include "llvm/IR/DiagnosticInfo.h"31#include "llvm/IR/DiagnosticPrinter.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/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/InitLLVM.h"48#include "llvm/Support/PGOOptions.h"49#include "llvm/Support/Path.h"50#include "llvm/Support/PluginLoader.h"51#include "llvm/Support/SourceMgr.h"52#include "llvm/Support/TargetSelect.h"53#include "llvm/Support/TimeProfiler.h"54#include "llvm/Support/ToolOutputFile.h"55#include "llvm/Support/WithColor.h"56#include "llvm/Target/TargetLoweringObjectFile.h"57#include "llvm/Target/TargetMachine.h"58#include "llvm/TargetParser/Host.h"59#include "llvm/TargetParser/SubtargetFeature.h"60#include "llvm/TargetParser/Triple.h"61#include "llvm/Transforms/Utils/Cloning.h"62#include <cassert>63#include <memory>64#include <optional>65using namespace llvm;66 67static codegen::RegisterCodeGenFlags CGF;68static codegen::RegisterSaveStatsFlag SSF;69 70// General options for llc. Other pass-specific options are specified71// within the corresponding llc passes, and target-specific options72// and back-end code generation options are specified with the target machine.73//74static cl::opt<std::string>75 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));76 77static cl::list<std::string>78 InstPrinterOptions("M", cl::desc("InstPrinter options"));79 80static cl::opt<std::string>81 InputLanguage("x", cl::desc("Input language ('ir' or 'mir')"));82 83static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),84 cl::value_desc("filename"));85 86static cl::opt<std::string>87 SplitDwarfOutputFile("split-dwarf-output", cl::desc(".dwo output filename"),88 cl::value_desc("filename"));89 90static cl::opt<unsigned>91 TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),92 cl::value_desc("N"),93 cl::desc("Repeat compilation N times for timing"));94 95static cl::opt<bool> TimeTrace("time-trace", cl::desc("Record time trace"));96 97static cl::opt<unsigned> TimeTraceGranularity(98 "time-trace-granularity",99 cl::desc(100 "Minimum time granularity (in microseconds) traced by time profiler"),101 cl::init(500), cl::Hidden);102 103static cl::opt<std::string>104 TimeTraceFile("time-trace-file",105 cl::desc("Specify time trace file destination"),106 cl::value_desc("filename"));107 108static cl::opt<std::string>109 BinutilsVersion("binutils-version", cl::Hidden,110 cl::desc("Produced object files can use all ELF features "111 "supported by this binutils version and newer."112 "If -no-integrated-as is specified, the generated "113 "assembly will consider GNU as support."114 "'none' means that all ELF features can be used, "115 "regardless of binutils support"));116 117static cl::opt<bool>118 PreserveComments("preserve-as-comments", cl::Hidden,119 cl::desc("Preserve Comments in outputted assembly"),120 cl::init(true));121 122// Determine optimization level.123static cl::opt<char>124 OptLevel("O",125 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "126 "(default = '-O2')"),127 cl::Prefix, cl::init('2'));128 129static cl::opt<std::string>130 TargetTriple("mtriple", cl::desc("Override target triple for module"));131 132static cl::opt<std::string> SplitDwarfFile(133 "split-dwarf-file",134 cl::desc(135 "Specify the name of the .dwo file to encode in the DWARF output"));136 137static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,138 cl::desc("Do not verify input module"));139 140static cl::opt<bool> VerifyEach("verify-each",141 cl::desc("Verify after each transform"));142 143static cl::opt<bool>144 DisableSimplifyLibCalls("disable-simplify-libcalls",145 cl::desc("Disable simplify-libcalls"));146 147static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,148 cl::desc("Show encoding in .s output"));149 150static cl::opt<unsigned>151 OutputAsmVariant("output-asm-variant",152 cl::desc("Syntax variant to use for output printing"));153 154static cl::opt<bool>155 DwarfDirectory("dwarf-directory", cl::Hidden,156 cl::desc("Use .file directives with an explicit directory"),157 cl::init(true));158 159static cl::opt<bool> AsmVerbose("asm-verbose",160 cl::desc("Add comments to directives."),161 cl::init(true));162 163static cl::opt<bool>164 CompileTwice("compile-twice", cl::Hidden,165 cl::desc("Run everything twice, re-using the same pass "166 "manager and verify the result is the same."),167 cl::init(false));168 169static cl::opt<bool> DiscardValueNames(170 "discard-value-names",171 cl::desc("Discard names from Value (other than GlobalValue)."),172 cl::init(false), cl::Hidden);173 174static cl::opt<bool>175 PrintMIR2VecVocab("print-mir2vec-vocab", cl::Hidden,176 cl::desc("Print MIR2Vec vocabulary contents"),177 cl::init(false));178 179static cl::opt<bool>180 PrintMIR2Vec("print-mir2vec", cl::Hidden,181 cl::desc("Print MIR2Vec embeddings for functions"),182 cl::init(false));183 184static cl::list<std::string> IncludeDirs("I", cl::desc("include search path"));185 186static cl::opt<bool> RemarksWithHotness(187 "pass-remarks-with-hotness",188 cl::desc("With PGO, include profile count in optimization remarks"),189 cl::Hidden);190 191static cl::opt<std::optional<uint64_t>, false, remarks::HotnessThresholdParser>192 RemarksHotnessThreshold(193 "pass-remarks-hotness-threshold",194 cl::desc("Minimum profile count required for "195 "an optimization remark to be output. "196 "Use 'auto' to apply the threshold from profile summary."),197 cl::value_desc("N or 'auto'"), cl::init(0), cl::Hidden);198 199static cl::opt<std::string>200 RemarksFilename("pass-remarks-output",201 cl::desc("Output filename for pass remarks"),202 cl::value_desc("filename"));203 204static cl::opt<std::string>205 RemarksPasses("pass-remarks-filter",206 cl::desc("Only record optimization remarks from passes whose "207 "names match the given regular expression"),208 cl::value_desc("regex"));209 210static cl::opt<std::string> RemarksFormat(211 "pass-remarks-format",212 cl::desc("The format used for serializing remarks (default: YAML)"),213 cl::value_desc("format"), cl::init("yaml"));214 215static cl::opt<bool> EnableNewPassManager(216 "enable-new-pm", cl::desc("Enable the new pass manager"), cl::init(false));217 218// This flag specifies a textual description of the optimization pass pipeline219// to run over the module. This flag switches opt to use the new pass manager220// infrastructure, completely disabling all of the flags specific to the old221// pass management.222static cl::opt<std::string> PassPipeline(223 "passes",224 cl::desc(225 "A textual description of the pass pipeline. To have analysis passes "226 "available before a certain pass, add 'require<foo-analysis>'."));227static cl::alias PassPipeline2("p", cl::aliasopt(PassPipeline),228 cl::desc("Alias for -passes"));229 230static std::vector<std::string> &getRunPassNames() {231 static std::vector<std::string> RunPassNames;232 return RunPassNames;233}234 235namespace {236struct RunPassOption {237 void operator=(const std::string &Val) const {238 if (Val.empty())239 return;240 SmallVector<StringRef, 8> PassNames;241 StringRef(Val).split(PassNames, ',', -1, false);242 for (auto PassName : PassNames)243 getRunPassNames().push_back(std::string(PassName));244 }245};246} // namespace247 248static RunPassOption RunPassOpt;249 250static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass(251 "run-pass",252 cl::desc("Run compiler only for specified passes (comma separated list)"),253 cl::value_desc("pass-name"), cl::location(RunPassOpt));254 255// PGO command line options256enum PGOKind {257 NoPGO,258 SampleUse,259};260 261static cl::opt<PGOKind>262 PGOKindFlag("pgo-kind", cl::init(NoPGO), cl::Hidden,263 cl::desc("The kind of profile guided optimization"),264 cl::values(clEnumValN(NoPGO, "nopgo", "Do not use PGO."),265 clEnumValN(SampleUse, "pgo-sample-use-pipeline",266 "Use sampled profile to guide PGO.")));267 268// Function to set PGO options on TargetMachine based on command line flags.269static void setPGOOptions(TargetMachine &TM) {270 std::optional<PGOOptions> PGOOpt;271 272 switch (PGOKindFlag) {273 case SampleUse:274 // Use default values for other PGOOptions parameters. This parameter275 // is used to test that PGO data is preserved at -O0.276 PGOOpt = PGOOptions("", "", "", "", PGOOptions::SampleUse,277 PGOOptions::NoCSAction);278 break;279 case NoPGO:280 PGOOpt = std::nullopt;281 break;282 }283 284 if (PGOOpt)285 TM.setPGOOption(PGOOpt);286}287 288static int compileModule(char **argv, LLVMContext &Context,289 std::string &OutputFilename);290 291[[noreturn]] static void reportError(Twine Msg, StringRef Filename = "") {292 SmallString<256> Prefix;293 if (!Filename.empty()) {294 if (Filename == "-")295 Filename = "<stdin>";296 ("'" + Twine(Filename) + "': ").toStringRef(Prefix);297 }298 WithColor::error(errs(), "llc") << Prefix << Msg << "\n";299 exit(1);300}301 302[[noreturn]] static void reportError(Error Err, StringRef Filename) {303 assert(Err);304 handleAllErrors(createFileError(Filename, std::move(Err)),305 [&](const ErrorInfoBase &EI) { reportError(EI.message()); });306 llvm_unreachable("reportError() should not return");307}308 309static std::unique_ptr<ToolOutputFile> GetOutputStream(Triple::OSType OS) {310 // If we don't yet have an output filename, make one.311 if (OutputFilename.empty()) {312 if (InputFilename == "-")313 OutputFilename = "-";314 else {315 // If InputFilename ends in .bc or .ll, remove it.316 StringRef IFN = InputFilename;317 if (IFN.ends_with(".bc") || IFN.ends_with(".ll"))318 OutputFilename = std::string(IFN.drop_back(3));319 else if (IFN.ends_with(".mir"))320 OutputFilename = std::string(IFN.drop_back(4));321 else322 OutputFilename = std::string(IFN);323 324 switch (codegen::getFileType()) {325 case CodeGenFileType::AssemblyFile:326 OutputFilename += ".s";327 break;328 case CodeGenFileType::ObjectFile:329 if (OS == Triple::Win32)330 OutputFilename += ".obj";331 else332 OutputFilename += ".o";333 break;334 case CodeGenFileType::Null:335 OutputFilename = "-";336 break;337 }338 }339 }340 341 // Decide if we need "binary" output.342 bool Binary = false;343 switch (codegen::getFileType()) {344 case CodeGenFileType::AssemblyFile:345 break;346 case CodeGenFileType::ObjectFile:347 case CodeGenFileType::Null:348 Binary = true;349 break;350 }351 352 // Open the file.353 std::error_code EC;354 sys::fs::OpenFlags OpenFlags = sys::fs::OF_None;355 if (!Binary)356 OpenFlags |= sys::fs::OF_TextWithCRLF;357 auto FDOut = std::make_unique<ToolOutputFile>(OutputFilename, EC, OpenFlags);358 if (EC)359 reportError(EC.message());360 return FDOut;361}362 363// main - Entry point for the llc compiler.364//365int main(int argc, char **argv) {366 InitLLVM X(argc, argv);367 368 // Enable debug stream buffering.369 EnableDebugBuffering = true;370 371 // Initialize targets first, so that --version shows registered targets.372 InitializeAllTargets();373 InitializeAllTargetMCs();374 InitializeAllAsmPrinters();375 InitializeAllAsmParsers();376 377 // Initialize codegen and IR passes used by llc so that the -print-after,378 // -print-before, and -stop-after options work.379 PassRegistry *Registry = PassRegistry::getPassRegistry();380 initializeCore(*Registry);381 initializeCodeGen(*Registry);382 initializeLoopStrengthReducePass(*Registry);383 initializeLowerIntrinsicsPass(*Registry);384 initializePostInlineEntryExitInstrumenterPass(*Registry);385 initializeUnreachableBlockElimLegacyPassPass(*Registry);386 initializeConstantHoistingLegacyPassPass(*Registry);387 initializeScalarOpts(*Registry);388 initializeVectorization(*Registry);389 initializeScalarizeMaskedMemIntrinLegacyPassPass(*Registry);390 initializeExpandReductionsPass(*Registry);391 initializeHardwareLoopsLegacyPass(*Registry);392 initializeTransformUtils(*Registry);393 initializeReplaceWithVeclibLegacyPass(*Registry);394 395 // Initialize debugging passes.396 initializeScavengerTestPass(*Registry);397 398 // Register the Target and CPU printer for --version.399 cl::AddExtraVersionPrinter(sys::printDefaultTargetAndDetectedCPU);400 // Register the target printer for --version.401 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);402 403 cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");404 405 if (!PassPipeline.empty() && !getRunPassNames().empty()) {406 errs() << "The `llc -run-pass=...` syntax for the new pass manager is "407 "not supported, please use `llc -passes=<pipeline>` (or the `-p` "408 "alias for a more concise version).\n";409 return 1;410 }411 412 if (TimeTrace)413 timeTraceProfilerInitialize(TimeTraceGranularity, argv[0]);414 auto TimeTraceScopeExit = make_scope_exit([]() {415 if (TimeTrace) {416 if (auto E = timeTraceProfilerWrite(TimeTraceFile, OutputFilename)) {417 handleAllErrors(std::move(E), [&](const StringError &SE) {418 errs() << SE.getMessage() << "\n";419 });420 return;421 }422 timeTraceProfilerCleanup();423 }424 });425 426 LLVMContext Context;427 Context.setDiscardValueNames(DiscardValueNames);428 429 // Set a diagnostic handler that doesn't exit on the first error430 Context.setDiagnosticHandler(std::make_unique<LLCDiagnosticHandler>());431 432 Expected<LLVMRemarkFileHandle> RemarksFileOrErr =433 setupLLVMOptimizationRemarks(Context, RemarksFilename, RemarksPasses,434 RemarksFormat, RemarksWithHotness,435 RemarksHotnessThreshold);436 if (Error E = RemarksFileOrErr.takeError())437 reportError(std::move(E), RemarksFilename);438 LLVMRemarkFileHandle RemarksFile = std::move(*RemarksFileOrErr);439 440 codegen::MaybeEnableStatistics();441 std::string OutputFilename;442 443 if (InputLanguage != "" && InputLanguage != "ir" && InputLanguage != "mir")444 reportError("input language must be '', 'IR' or 'MIR'");445 446 // Compile the module TimeCompilations times to give better compile time447 // metrics.448 for (unsigned I = TimeCompilations; I; --I)449 if (int RetVal = compileModule(argv, Context, OutputFilename))450 return RetVal;451 452 if (RemarksFile)453 RemarksFile->keep();454 455 return codegen::MaybeSaveStatistics(OutputFilename, "llc");456}457 458static bool addPass(PassManagerBase &PM, const char *argv0, StringRef PassName,459 TargetPassConfig &TPC) {460 if (PassName == "none")461 return false;462 463 const PassRegistry *PR = PassRegistry::getPassRegistry();464 const PassInfo *PI = PR->getPassInfo(PassName);465 if (!PI) {466 WithColor::error(errs(), argv0)467 << "run-pass " << PassName << " is not registered.\n";468 return true;469 }470 471 Pass *P;472 if (PI->getNormalCtor())473 P = PI->getNormalCtor()();474 else {475 WithColor::error(errs(), argv0)476 << "cannot create pass: " << PI->getPassName() << "\n";477 return true;478 }479 std::string Banner = std::string("After ") + std::string(P->getPassName());480 TPC.addMachinePrePasses();481 PM.add(P);482 TPC.addMachinePostPasses(Banner);483 484 return false;485}486 487static int compileModule(char **argv, LLVMContext &Context,488 std::string &OutputFilename) {489 // Load the module to be compiled...490 SMDiagnostic Err;491 std::unique_ptr<Module> M;492 std::unique_ptr<MIRParser> MIR;493 Triple TheTriple;494 std::string CPUStr = codegen::getCPUStr(),495 FeaturesStr = codegen::getFeaturesStr();496 497 // Set attributes on functions as loaded from MIR from command line arguments.498 auto setMIRFunctionAttributes = [&CPUStr, &FeaturesStr](Function &F) {499 codegen::setFunctionAttributes(CPUStr, FeaturesStr, F);500 };501 502 auto MAttrs = codegen::getMAttrs();503 bool SkipModule =504 CPUStr == "help" || (!MAttrs.empty() && MAttrs.front() == "help");505 506 CodeGenOptLevel OLvl;507 if (auto Level = CodeGenOpt::parseLevel(OptLevel)) {508 OLvl = *Level;509 } else {510 WithColor::error(errs(), argv[0]) << "invalid optimization level.\n";511 return 1;512 }513 514 // Parse 'none' or '$major.$minor'. Disallow -binutils-version=0 because we515 // use that to indicate the MC default.516 if (!BinutilsVersion.empty() && BinutilsVersion != "none") {517 StringRef V = BinutilsVersion.getValue();518 unsigned Num;519 if (V.consumeInteger(10, Num) || Num == 0 ||520 !(V.empty() ||521 (V.consume_front(".") && !V.consumeInteger(10, Num) && V.empty()))) {522 WithColor::error(errs(), argv[0])523 << "invalid -binutils-version, accepting 'none' or major.minor\n";524 return 1;525 }526 }527 TargetOptions Options;528 auto InitializeOptions = [&](const Triple &TheTriple) {529 Options = codegen::InitTargetOptionsFromCodeGenFlags(TheTriple);530 531 if (Options.XCOFFReadOnlyPointers) {532 if (!TheTriple.isOSAIX())533 reportError("-mxcoff-roptr option is only supported on AIX",534 InputFilename);535 536 // Since the storage mapping class is specified per csect,537 // without using data sections, it is less effective to use read-only538 // pointers. Using read-only pointers may cause other RO variables in the539 // same csect to become RW when the linker acts upon `-bforceimprw`;540 // therefore, we require that separate data sections are used in the541 // presence of ReadOnlyPointers. We respect the setting of data-sections542 // since we have not found reasons to do otherwise that overcome the user543 // surprise of not respecting the setting.544 if (!Options.DataSections)545 reportError("-mxcoff-roptr option must be used with -data-sections",546 InputFilename);547 }548 549 if (TheTriple.isX86() &&550 codegen::getFuseFPOps() != FPOpFusion::FPOpFusionMode::Standard)551 WithColor::warning(errs(), argv[0])552 << "X86 backend ignores --fp-contract setting; use IR fast-math "553 "flags instead.";554 555 Options.BinutilsVersion =556 TargetMachine::parseBinutilsVersion(BinutilsVersion);557 Options.MCOptions.ShowMCEncoding = ShowMCEncoding;558 Options.MCOptions.AsmVerbose = AsmVerbose;559 Options.MCOptions.PreserveAsmComments = PreserveComments;560 if (OutputAsmVariant.getNumOccurrences())561 Options.MCOptions.OutputAsmVariant = OutputAsmVariant;562 Options.MCOptions.IASSearchPaths = IncludeDirs;563 Options.MCOptions.InstPrinterOptions = InstPrinterOptions;564 Options.MCOptions.SplitDwarfFile = SplitDwarfFile;565 if (DwarfDirectory.getPosition()) {566 Options.MCOptions.MCUseDwarfDirectory =567 DwarfDirectory ? MCTargetOptions::EnableDwarfDirectory568 : MCTargetOptions::DisableDwarfDirectory;569 } else {570 // -dwarf-directory is not set explicitly. Some assemblers571 // (e.g. GNU as or ptxas) do not support `.file directory'572 // syntax prior to DWARFv5. Let the target decide the default573 // value.574 Options.MCOptions.MCUseDwarfDirectory =575 MCTargetOptions::DefaultDwarfDirectory;576 }577 };578 579 std::optional<Reloc::Model> RM = codegen::getExplicitRelocModel();580 std::optional<CodeModel::Model> CM = codegen::getExplicitCodeModel();581 582 const Target *TheTarget = nullptr;583 std::unique_ptr<TargetMachine> Target;584 585 // If user just wants to list available options, skip module loading586 if (!SkipModule) {587 auto SetDataLayout = [&](StringRef DataLayoutTargetTriple,588 StringRef OldDLStr) -> std::optional<std::string> {589 // If we are supposed to override the target triple, do so now.590 std::string IRTargetTriple = DataLayoutTargetTriple.str();591 if (!TargetTriple.empty())592 IRTargetTriple = Triple::normalize(TargetTriple);593 TheTriple = Triple(IRTargetTriple);594 if (TheTriple.getTriple().empty())595 TheTriple.setTriple(sys::getDefaultTargetTriple());596 597 std::string Error;598 TheTarget =599 TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);600 if (!TheTarget) {601 WithColor::error(errs(), argv[0]) << Error << "\n";602 exit(1);603 }604 605 InitializeOptions(TheTriple);606 Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(607 TheTriple, CPUStr, FeaturesStr, Options, RM, CM, OLvl));608 assert(Target && "Could not allocate target machine!");609 610 // Set PGO options based on command line flags611 setPGOOptions(*Target);612 613 return Target->createDataLayout().getStringRepresentation();614 };615 if (InputLanguage == "mir" ||616 (InputLanguage == "" && StringRef(InputFilename).ends_with(".mir"))) {617 MIR = createMIRParserFromFile(InputFilename, Err, Context,618 setMIRFunctionAttributes);619 if (MIR)620 M = MIR->parseIRModule(SetDataLayout);621 } else {622 M = parseIRFile(InputFilename, Err, Context,623 ParserCallbacks(SetDataLayout));624 }625 if (!M) {626 Err.print(argv[0], WithColor::error(errs(), argv[0]));627 return 1;628 }629 if (!TargetTriple.empty())630 M->setTargetTriple(Triple(Triple::normalize(TargetTriple)));631 632 std::optional<CodeModel::Model> CM_IR = M->getCodeModel();633 if (!CM && CM_IR)634 Target->setCodeModel(*CM_IR);635 if (std::optional<uint64_t> LDT = codegen::getExplicitLargeDataThreshold())636 Target->setLargeDataThreshold(*LDT);637 } else {638 TheTriple = Triple(Triple::normalize(TargetTriple));639 if (TheTriple.getTriple().empty())640 TheTriple.setTriple(sys::getDefaultTargetTriple());641 642 // Get the target specific parser.643 std::string Error;644 TheTarget =645 TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);646 if (!TheTarget) {647 WithColor::error(errs(), argv[0]) << Error << "\n";648 return 1;649 }650 651 InitializeOptions(TheTriple);652 Target = std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(653 TheTriple, CPUStr, FeaturesStr, Options, RM, CM, OLvl));654 assert(Target && "Could not allocate target machine!");655 656 // Set PGO options based on command line flags657 setPGOOptions(*Target);658 659 // If we don't have a module then just exit now. We do this down660 // here since the CPU/Feature help is underneath the target machine661 // creation.662 return 0;663 }664 665 assert(M && "Should have exited if we didn't have a module!");666 if (codegen::getFloatABIForCalls() != FloatABI::Default)667 Target->Options.FloatABIType = codegen::getFloatABIForCalls();668 669 // Figure out where we are going to send the output.670 std::unique_ptr<ToolOutputFile> Out = GetOutputStream(TheTriple.getOS());671 if (!Out)672 return 1;673 674 // Ensure the filename is passed down to CodeViewDebug.675 Target->Options.ObjectFilenameForDebug = Out->outputFilename();676 677 // Return a copy of the output filename via the output param678 OutputFilename = Out->outputFilename();679 680 // Tell target that this tool is not necessarily used with argument ABI681 // compliance (i.e. narrow integer argument extensions).682 Target->Options.VerifyArgABICompliance = 0;683 684 std::unique_ptr<ToolOutputFile> DwoOut;685 if (!SplitDwarfOutputFile.empty()) {686 std::error_code EC;687 DwoOut = std::make_unique<ToolOutputFile>(SplitDwarfOutputFile, EC,688 sys::fs::OF_None);689 if (EC)690 reportError(EC.message(), SplitDwarfOutputFile);691 }692 693 // Add an appropriate TargetLibraryInfo pass for the module's triple.694 TargetLibraryInfoImpl TLII(M->getTargetTriple(), Target->Options.VecLib);695 696 // The -disable-simplify-libcalls flag actually disables all builtin optzns.697 if (DisableSimplifyLibCalls)698 TLII.disableAllFunctions();699 700 // Verify module immediately to catch problems before doInitialization() is701 // called on any passes.702 if (!NoVerify && verifyModule(*M, &errs()))703 reportError("input module cannot be verified", InputFilename);704 705 // Override function attributes based on CPUStr, FeaturesStr, and command line706 // flags.707 codegen::setFunctionAttributes(CPUStr, FeaturesStr, *M);708 709 if (mc::getExplicitRelaxAll() &&710 codegen::getFileType() != CodeGenFileType::ObjectFile)711 WithColor::warning(errs(), argv[0])712 << ": warning: ignoring -mc-relax-all because filetype != obj";713 714 VerifierKind VK = VerifierKind::InputOutput;715 if (NoVerify)716 VK = VerifierKind::None;717 else if (VerifyEach)718 VK = VerifierKind::EachPass;719 720 if (EnableNewPassManager || !PassPipeline.empty()) {721 return compileModuleWithNewPM(argv[0], std::move(M), std::move(MIR),722 std::move(Target), std::move(Out),723 std::move(DwoOut), Context, TLII, VK,724 PassPipeline, codegen::getFileType());725 }726 727 // Build up all of the passes that we want to do to the module.728 legacy::PassManager PM;729 PM.add(new TargetLibraryInfoWrapperPass(TLII));730 731 {732 raw_pwrite_stream *OS = &Out->os();733 734 // Manually do the buffering rather than using buffer_ostream,735 // so we can memcmp the contents in CompileTwice mode736 SmallVector<char, 0> Buffer;737 std::unique_ptr<raw_svector_ostream> BOS;738 if ((codegen::getFileType() != CodeGenFileType::AssemblyFile &&739 !Out->os().supportsSeeking()) ||740 CompileTwice) {741 BOS = std::make_unique<raw_svector_ostream>(Buffer);742 OS = BOS.get();743 }744 745 const char *argv0 = argv[0];746 MachineModuleInfoWrapperPass *MMIWP =747 new MachineModuleInfoWrapperPass(Target.get());748 749 // Set a temporary diagnostic handler. This is used before750 // MachineModuleInfoWrapperPass::doInitialization for features like -M.751 bool HasMCErrors = false;752 MCContext &MCCtx = MMIWP->getMMI().getContext();753 MCCtx.setDiagnosticHandler([&](const SMDiagnostic &SMD, bool IsInlineAsm,754 const SourceMgr &SrcMgr,755 std::vector<const MDNode *> &LocInfos) {756 WithColor::error(errs(), argv0) << SMD.getMessage() << '\n';757 HasMCErrors = true;758 });759 760 // Construct a custom pass pipeline that starts after instruction761 // selection.762 if (!getRunPassNames().empty()) {763 if (!MIR) {764 WithColor::error(errs(), argv[0])765 << "run-pass is for .mir file only.\n";766 delete MMIWP;767 return 1;768 }769 TargetPassConfig *PTPC = Target->createPassConfig(PM);770 TargetPassConfig &TPC = *PTPC;771 if (TPC.hasLimitedCodeGenPipeline()) {772 WithColor::error(errs(), argv[0])773 << "run-pass cannot be used with "774 << TPC.getLimitedCodeGenPipelineReason() << ".\n";775 delete PTPC;776 delete MMIWP;777 return 1;778 }779 780 TPC.setDisableVerify(NoVerify);781 PM.add(&TPC);782 PM.add(MMIWP);783 TPC.printAndVerify("");784 for (const std::string &RunPassName : getRunPassNames()) {785 if (addPass(PM, argv0, RunPassName, TPC))786 return 1;787 }788 TPC.setInitialized();789 PM.add(createPrintMIRPass(*OS));790 791 // Add MIR2Vec vocabulary printer if requested792 if (PrintMIR2VecVocab) {793 PM.add(createMIR2VecVocabPrinterLegacyPass(errs()));794 }795 796 // Add MIR2Vec printer if requested797 if (PrintMIR2Vec) {798 PM.add(createMIR2VecPrinterLegacyPass(errs()));799 }800 801 PM.add(createFreeMachineFunctionPass());802 } else {803 if (Target->addPassesToEmitFile(PM, *OS, DwoOut ? &DwoOut->os() : nullptr,804 codegen::getFileType(), NoVerify,805 MMIWP)) {806 if (!HasMCErrors)807 reportError("target does not support generation of this file type");808 }809 810 // Add MIR2Vec vocabulary printer if requested811 if (PrintMIR2VecVocab) {812 PM.add(createMIR2VecVocabPrinterLegacyPass(errs()));813 }814 815 // Add MIR2Vec printer if requested816 if (PrintMIR2Vec) {817 PM.add(createMIR2VecPrinterLegacyPass(errs()));818 }819 }820 821 Target->getObjFileLowering()->Initialize(MMIWP->getMMI().getContext(),822 *Target);823 if (MIR) {824 assert(MMIWP && "Forgot to create MMIWP?");825 if (MIR->parseMachineFunctions(*M, MMIWP->getMMI()))826 return 1;827 }828 829 // Before executing passes, print the final values of the LLVM options.830 cl::PrintOptionValues();831 832 // If requested, run the pass manager over the same module again,833 // to catch any bugs due to persistent state in the passes. Note that834 // opt has the same functionality, so it may be worth abstracting this out835 // in the future.836 SmallVector<char, 0> CompileTwiceBuffer;837 if (CompileTwice) {838 std::unique_ptr<Module> M2(llvm::CloneModule(*M));839 PM.run(*M2);840 CompileTwiceBuffer = Buffer;841 Buffer.clear();842 }843 844 PM.run(*M);845 846 if (Context.getDiagHandlerPtr()->HasErrors || HasMCErrors)847 return 1;848 849 // Compare the two outputs and make sure they're the same850 if (CompileTwice) {851 if (Buffer.size() != CompileTwiceBuffer.size() ||852 (memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) !=853 0)) {854 errs()855 << "Running the pass manager twice changed the output.\n"856 "Writing the result of the second run to the specified output\n"857 "To generate the one-run comparison binary, just run without\n"858 "the compile-twice option\n";859 Out->os() << Buffer;860 Out->keep();861 return 1;862 }863 }864 865 if (BOS) {866 Out->os() << Buffer;867 }868 }869 870 // Declare success.871 Out->keep();872 if (DwoOut)873 DwoOut->keep();874 875 return 0;876}877