lib/LTO/LTOBackend.cpp

   1 //===-LTOBackend.cpp - LLVM Link Time Optimizer Backend -------------------===//
   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 file implements the "backend" phase of LTO, i.e. it performs
  10 // optimization and code generation on a loaded module. It is generally used
  11 // internally by the LTO class but can also be used independently, for example
  12 // to implement a standalone ThinLTO backend.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "llvm/LTO/LTOBackend.h"
  17 #include "llvm/Analysis/AliasAnalysis.h"
  18 #include "llvm/Analysis/CGSCCPassManager.h"
  19 #include "llvm/Analysis/TargetLibraryInfo.h"
  20 #include "llvm/Analysis/TargetTransformInfo.h"
  21 #include "llvm/Bitcode/BitcodeReader.h"
  22 #include "llvm/Bitcode/BitcodeWriter.h"
  23 #include "llvm/IR/LegacyPassManager.h"
  24 #include "llvm/IR/PassManager.h"
  25 #include "llvm/IR/Verifier.h"
  26 #include "llvm/LTO/LTO.h"
  27 #include "llvm/MC/SubtargetFeature.h"
  28 #include "llvm/Object/ModuleSymbolTable.h"
  29 #include "llvm/Passes/PassBuilder.h"
  30 #include "llvm/Support/Error.h"
  31 #include "llvm/Support/FileSystem.h"
  32 #include "llvm/Support/MemoryBuffer.h"
  33 #include "llvm/Support/Path.h"
  34 #include "llvm/Support/Program.h"
  35 #include "llvm/Support/raw_ostream.h"
  36 #include "llvm/Support/TargetRegistry.h"
  37 #include "llvm/Support/ThreadPool.h"
  38 #include "llvm/Target/TargetMachine.h"
  39 #include "llvm/Transforms/IPO.h"
  40 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
  41 #include "llvm/Transforms/Scalar/LoopPassManager.h"
  42 #include "llvm/Transforms/Utils/FunctionImportUtils.h"
  43 #include "llvm/Transforms/Utils/SplitModule.h"
  44
  45 using namespace llvm;
  46 using namespace lto;
  47
  48 LLVM_ATTRIBUTE_NORETURN static void reportOpenError(StringRef Path, Twine Msg) {
  49   errs() << "failed to open " << Path << ": " << Msg << '\n';
  50   errs().flush();
  51   exit(1);
  52 }
  53
  54 Error Config::addSaveTemps(std::string OutputFileName,
  55                            bool UseInputModulePath) {
  56   ShouldDiscardValueNames = false;
  57
  58   std::error_code EC;
  59   ResolutionFile = llvm::make_unique<raw_fd_ostream>(
  60       OutputFileName + "resolution.txt", EC, sys::fs::OpenFlags::F_Text);
  61   if (EC)
  62     return errorCodeToError(EC);
  63
  64   auto setHook = [&](std::string PathSuffix, ModuleHookFn &Hook) {
  65     // Keep track of the hook provided by the linker, which also needs to run.
  66     ModuleHookFn LinkerHook = Hook;
  67     Hook = [=](unsigned Task, const Module &M) {
  68       // If the linker's hook returned false, we need to pass that result
  69       // through.
  70       if (LinkerHook && !LinkerHook(Task, M))
  71         return false;
  72
  73       std::string PathPrefix;
  74       // If this is the combined module (not a ThinLTO backend compile) or the
  75       // user hasn't requested using the input module's path, emit to a file
  76       // named from the provided OutputFileName with the Task ID appended.
  77       if (M.getModuleIdentifier() == "ld-temp.o" || !UseInputModulePath) {
  78         PathPrefix = OutputFileName;
  79         if (Task != (unsigned)-1)
  80           PathPrefix += utostr(Task) + ".";
  81       } else
  82         PathPrefix = M.getModuleIdentifier() + ".";
  83       std::string Path = PathPrefix + PathSuffix + ".bc";
  84       std::error_code EC;
  85       raw_fd_ostream OS(Path, EC, sys::fs::OpenFlags::F_None);
  86       // Because -save-temps is a debugging feature, we report the error
  87       // directly and exit.
  88       if (EC)
  89         reportOpenError(Path, EC.message());
  90       WriteBitcodeToFile(M, OS, /*ShouldPreserveUseListOrder=*/false);
  91       return true;
  92     };
  93   };
  94
  95   setHook("0.preopt", PreOptModuleHook);
  96   setHook("1.promote", PostPromoteModuleHook);
  97   setHook("2.internalize", PostInternalizeModuleHook);
  98   setHook("3.import", PostImportModuleHook);
  99   setHook("4.opt", PostOptModuleHook);
 100   setHook("5.precodegen", PreCodeGenModuleHook);
 101
 102   CombinedIndexHook = [=](const ModuleSummaryIndex &Index) {
 103     std::string Path = OutputFileName + "index.bc";
 104     std::error_code EC;
 105     raw_fd_ostream OS(Path, EC, sys::fs::OpenFlags::F_None);
 106     // Because -save-temps is a debugging feature, we report the error
 107     // directly and exit.
 108     if (EC)
 109       reportOpenError(Path, EC.message());
 110     WriteIndexToFile(Index, OS);
 111
 112     Path = OutputFileName + "index.dot";
 113     raw_fd_ostream OSDot(Path, EC, sys::fs::OpenFlags::F_None);
 114     if (EC)
 115       reportOpenError(Path, EC.message());
 116     Index.exportToDot(OSDot);
 117     return true;
 118   };
 119
 120   return Error::success();
 121 }
 122
 123 namespace {
 124
 125 std::unique_ptr<TargetMachine>
 126 createTargetMachine(Config &Conf, const Target *TheTarget, Module &M) {
 127   StringRef TheTriple = M.getTargetTriple();
 128   SubtargetFeatures Features;
 129   Features.getDefaultSubtargetFeatures(Triple(TheTriple));
 130   for (const std::string &A : Conf.MAttrs)
 131     Features.AddFeature(A);
 132
 133   Reloc::Model RelocModel;
 134   if (Conf.RelocModel)
 135     RelocModel = *Conf.RelocModel;
 136   else
 137     RelocModel =
 138         M.getPICLevel() == PICLevel::NotPIC ? Reloc::Static : Reloc::PIC_;
 139
 140   Optional<CodeModel::Model> CodeModel;
 141   if (Conf.CodeModel)
 142     CodeModel = *Conf.CodeModel;
 143   else
 144     CodeModel = M.getCodeModel();
 145
 146   return std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
 147       TheTriple, Conf.CPU, Features.getString(), Conf.Options, RelocModel,
 148       CodeModel, Conf.CGOptLevel));
 149 }
 150
 151 static void runNewPMPasses(Config &Conf, Module &Mod, TargetMachine *TM,
 152                            unsigned OptLevel, bool IsThinLTO,
 153                            ModuleSummaryIndex *ExportSummary,
 154                            const ModuleSummaryIndex *ImportSummary) {
 155   Optional<PGOOptions> PGOOpt;
 156   if (!Conf.SampleProfile.empty())
 157     PGOOpt = PGOOptions("", "", Conf.SampleProfile, Conf.ProfileRemapping,
 158                         false, true);
 159
 160   PassBuilder PB(TM, PGOOpt);
 161   AAManager AA;
 162
 163   // Parse a custom AA pipeline if asked to.
 164   if (auto Err = PB.parseAAPipeline(AA, "default"))
 165     report_fatal_error("Error parsing default AA pipeline");
 166
 167   LoopAnalysisManager LAM(Conf.DebugPassManager);
 168   FunctionAnalysisManager FAM(Conf.DebugPassManager);
 169   CGSCCAnalysisManager CGAM(Conf.DebugPassManager);
 170   ModuleAnalysisManager MAM(Conf.DebugPassManager);
 171
 172   // Register the AA manager first so that our version is the one used.
 173   FAM.registerPass([&] { return std::move(AA); });
 174
 175   // Register all the basic analyses with the managers.
 176   PB.registerModuleAnalyses(MAM);
 177   PB.registerCGSCCAnalyses(CGAM);
 178   PB.registerFunctionAnalyses(FAM);
 179   PB.registerLoopAnalyses(LAM);
 180   PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
 181
 182   ModulePassManager MPM(Conf.DebugPassManager);
 183   // FIXME (davide): verify the input.
 184
 185   PassBuilder::OptimizationLevel OL;
 186
 187   switch (OptLevel) {
 188   default:
 189     llvm_unreachable("Invalid optimization level");
 190   case 0:
 191     OL = PassBuilder::O0;
 192     break;
 193   case 1:
 194     OL = PassBuilder::O1;
 195     break;
 196   case 2:
 197     OL = PassBuilder::O2;
 198     break;
 199   case 3:
 200     OL = PassBuilder::O3;
 201     break;
 202   }
 203
 204   if (IsThinLTO)
 205     MPM = PB.buildThinLTODefaultPipeline(OL, Conf.DebugPassManager,
 206                                          ImportSummary);
 207   else
 208     MPM = PB.buildLTODefaultPipeline(OL, Conf.DebugPassManager, ExportSummary);
 209   MPM.run(Mod, MAM);
 210
 211   // FIXME (davide): verify the output.
 212 }
 213
 214 static void runNewPMCustomPasses(Module &Mod, TargetMachine *TM,
 215                                  std::string PipelineDesc,
 216                                  std::string AAPipelineDesc,
 217                                  bool DisableVerify) {
 218   PassBuilder PB(TM);
 219   AAManager AA;
 220
 221   // Parse a custom AA pipeline if asked to.
 222   if (!AAPipelineDesc.empty())
 223     if (auto Err = PB.parseAAPipeline(AA, AAPipelineDesc))
 224       report_fatal_error("unable to parse AA pipeline description '" +
 225                          AAPipelineDesc + "': " + toString(std::move(Err)));
 226
 227   LoopAnalysisManager LAM;
 228   FunctionAnalysisManager FAM;
 229   CGSCCAnalysisManager CGAM;
 230   ModuleAnalysisManager MAM;
 231
 232   // Register the AA manager first so that our version is the one used.
 233   FAM.registerPass([&] { return std::move(AA); });
 234
 235   // Register all the basic analyses with the managers.
 236   PB.registerModuleAnalyses(MAM);
 237   PB.registerCGSCCAnalyses(CGAM);
 238   PB.registerFunctionAnalyses(FAM);
 239   PB.registerLoopAnalyses(LAM);
 240   PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
 241
 242   ModulePassManager MPM;
 243
 244   // Always verify the input.
 245   MPM.addPass(VerifierPass());
 246
 247   // Now, add all the passes we've been requested to.
 248   if (auto Err = PB.parsePassPipeline(MPM, PipelineDesc))
 249     report_fatal_error("unable to parse pass pipeline description '" +
 250                        PipelineDesc + "': " + toString(std::move(Err)));
 251
 252   if (!DisableVerify)
 253     MPM.addPass(VerifierPass());
 254   MPM.run(Mod, MAM);
 255 }
 256
 257 static void runOldPMPasses(Config &Conf, Module &Mod, TargetMachine *TM,
 258                            bool IsThinLTO, ModuleSummaryIndex *ExportSummary,
 259                            const ModuleSummaryIndex *ImportSummary) {
 260   legacy::PassManager passes;
 261   passes.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
 262
 263   PassManagerBuilder PMB;
 264   PMB.LibraryInfo = new TargetLibraryInfoImpl(Triple(TM->getTargetTriple()));
 265   PMB.Inliner = createFunctionInliningPass();
 266   PMB.ExportSummary = ExportSummary;
 267   PMB.ImportSummary = ImportSummary;
 268   // Unconditionally verify input since it is not verified before this
 269   // point and has unknown origin.
 270   PMB.VerifyInput = true;
 271   PMB.VerifyOutput = !Conf.DisableVerify;
 272   PMB.LoopVectorize = true;
 273   PMB.SLPVectorize = true;
 274   PMB.OptLevel = Conf.OptLevel;
 275   PMB.PGOSampleUse = Conf.SampleProfile;
 276   if (IsThinLTO)
 277     PMB.populateThinLTOPassManager(passes);
 278   else
 279     PMB.populateLTOPassManager(passes);
 280   passes.run(Mod);
 281 }
 282
 283 bool opt(Config &Conf, TargetMachine *TM, unsigned Task, Module &Mod,
 284          bool IsThinLTO, ModuleSummaryIndex *ExportSummary,
 285          const ModuleSummaryIndex *ImportSummary) {
 286   // FIXME: Plumb the combined index into the new pass manager.
 287   if (!Conf.OptPipeline.empty())
 288     runNewPMCustomPasses(Mod, TM, Conf.OptPipeline, Conf.AAPipeline,
 289                          Conf.DisableVerify);
 290   else if (Conf.UseNewPM)
 291     runNewPMPasses(Conf, Mod, TM, Conf.OptLevel, IsThinLTO, ExportSummary,
 292                    ImportSummary);
 293   else
 294     runOldPMPasses(Conf, Mod, TM, IsThinLTO, ExportSummary, ImportSummary);
 295   return !Conf.PostOptModuleHook || Conf.PostOptModuleHook(Task, Mod);
 296 }
 297
 298 void codegen(Config &Conf, TargetMachine *TM, AddStreamFn AddStream,
 299              unsigned Task, Module &Mod) {
 300   if (Conf.PreCodeGenModuleHook && !Conf.PreCodeGenModuleHook(Task, Mod))
 301     return;
 302
 303   std::unique_ptr<ToolOutputFile> DwoOut;
 304   SmallString<1024> DwoFile(Conf.DwoPath);
 305   if (!Conf.DwoDir.empty()) {
 306     std::error_code EC;
 307     if (auto EC = llvm::sys::fs::create_directories(Conf.DwoDir))
 308       report_fatal_error("Failed to create directory " + Conf.DwoDir + ": " +
 309                          EC.message());
 310
 311     DwoFile = Conf.DwoDir;
 312     sys::path::append(DwoFile, std::to_string(Task) + ".dwo");
 313   }
 314
 315   if (!DwoFile.empty()) {
 316     std::error_code EC;
 317     TM->Options.MCOptions.SplitDwarfFile = DwoFile.str().str();
 318     DwoOut = llvm::make_unique<ToolOutputFile>(DwoFile, EC, sys::fs::F_None);
 319     if (EC)
 320       report_fatal_error("Failed to open " + DwoFile + ": " + EC.message());
 321   }
 322
 323   auto Stream = AddStream(Task);
 324   legacy::PassManager CodeGenPasses;
 325   if (TM->addPassesToEmitFile(CodeGenPasses, *Stream->OS,
 326                               DwoOut ? &DwoOut->os() : nullptr,
 327                               Conf.CGFileType))
 328     report_fatal_error("Failed to setup codegen");
 329   CodeGenPasses.run(Mod);
 330
 331   if (DwoOut)
 332     DwoOut->keep();
 333 }
 334
 335 void splitCodeGen(Config &C, TargetMachine *TM, AddStreamFn AddStream,
 336                   unsigned ParallelCodeGenParallelismLevel,
 337                   std::unique_ptr<Module> Mod) {
 338   ThreadPool CodegenThreadPool(ParallelCodeGenParallelismLevel);
 339   unsigned ThreadCount = 0;
 340   const Target *T = &TM->getTarget();
 341
 342   SplitModule(
 343       std::move(Mod), ParallelCodeGenParallelismLevel,
 344       [&](std::unique_ptr<Module> MPart) {
 345         // We want to clone the module in a new context to multi-thread the
 346         // codegen. We do it by serializing partition modules to bitcode
 347         // (while still on the main thread, in order to avoid data races) and
 348         // spinning up new threads which deserialize the partitions into
 349         // separate contexts.
 350         // FIXME: Provide a more direct way to do this in LLVM.
 351         SmallString<0> BC;
 352         raw_svector_ostream BCOS(BC);
 353         WriteBitcodeToFile(*MPart, BCOS);
 354
 355         // Enqueue the task
 356         CodegenThreadPool.async(
 357             [&](const SmallString<0> &BC, unsigned ThreadId) {
 358               LTOLLVMContext Ctx(C);
 359               Expected<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
 360                   MemoryBufferRef(StringRef(BC.data(), BC.size()), "ld-temp.o"),
 361                   Ctx);
 362               if (!MOrErr)
 363                 report_fatal_error("Failed to read bitcode");
 364               std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());
 365
 366               std::unique_ptr<TargetMachine> TM =
 367                   createTargetMachine(C, T, *MPartInCtx);
 368
 369               codegen(C, TM.get(), AddStream, ThreadId, *MPartInCtx);
 370             },
 371             // Pass BC using std::move to ensure that it get moved rather than
 372             // copied into the thread's context.
 373             std::move(BC), ThreadCount++);
 374       },
 375       false);
 376
 377   // Because the inner lambda (which runs in a worker thread) captures our local
 378   // variables, we need to wait for the worker threads to terminate before we
 379   // can leave the function scope.
 380   CodegenThreadPool.wait();
 381 }
 382
 383 Expected<const Target *> initAndLookupTarget(Config &C, Module &Mod) {
 384   if (!C.OverrideTriple.empty())
 385     Mod.setTargetTriple(C.OverrideTriple);
 386   else if (Mod.getTargetTriple().empty())
 387     Mod.setTargetTriple(C.DefaultTriple);
 388
 389   std::string Msg;
 390   const Target *T = TargetRegistry::lookupTarget(Mod.getTargetTriple(), Msg);
 391   if (!T)
 392     return make_error<StringError>(Msg, inconvertibleErrorCode());
 393   return T;
 394 }
 395
 396 }
 397
 398 static Error
 399 finalizeOptimizationRemarks(std::unique_ptr<ToolOutputFile> DiagOutputFile) {
 400   // Make sure we flush the diagnostic remarks file in case the linker doesn't
 401   // call the global destructors before exiting.
 402   if (!DiagOutputFile)
 403     return Error::success();
 404   DiagOutputFile->keep();
 405   DiagOutputFile->os().flush();
 406   return Error::success();
 407 }
 408
 409 Error lto::backend(Config &C, AddStreamFn AddStream,
 410                    unsigned ParallelCodeGenParallelismLevel,
 411                    std::unique_ptr<Module> Mod,
 412                    ModuleSummaryIndex &CombinedIndex) {
 413   Expected<const Target *> TOrErr = initAndLookupTarget(C, *Mod);
 414   if (!TOrErr)
 415     return TOrErr.takeError();
 416
 417   std::unique_ptr<TargetMachine> TM = createTargetMachine(C, *TOrErr, *Mod);
 418
 419   // Setup optimization remarks.
 420   auto DiagFileOrErr = lto::setupOptimizationRemarks(
 421       Mod->getContext(), C.RemarksFilename, C.RemarksWithHotness);
 422   if (!DiagFileOrErr)
 423     return DiagFileOrErr.takeError();
 424   auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
 425
 426   if (!C.CodeGenOnly) {
 427     if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false,
 428              /*ExportSummary=*/&CombinedIndex, /*ImportSummary=*/nullptr))
 429       return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 430   }
 431
 432   if (ParallelCodeGenParallelismLevel == 1) {
 433     codegen(C, TM.get(), AddStream, 0, *Mod);
 434   } else {
 435     splitCodeGen(C, TM.get(), AddStream, ParallelCodeGenParallelismLevel,
 436                  std::move(Mod));
 437   }
 438   return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 439 }
 440
 441 static void dropDeadSymbols(Module &Mod, const GVSummaryMapTy &DefinedGlobals,
 442                             const ModuleSummaryIndex &Index) {
 443   std::vector<GlobalValue*> DeadGVs;
 444   for (auto &GV : Mod.global_values())
 445     if (GlobalValueSummary *GVS = DefinedGlobals.lookup(GV.getGUID()))
 446       if (!Index.isGlobalValueLive(GVS)) {
 447         DeadGVs.push_back(&GV);
 448         convertToDeclaration(GV);
 449       }
 450
 451   // Now that all dead bodies have been dropped, delete the actual objects
 452   // themselves when possible.
 453   for (GlobalValue *GV : DeadGVs) {
 454     GV->removeDeadConstantUsers();
 455     // Might reference something defined in native object (i.e. dropped a
 456     // non-prevailing IR def, but we need to keep the declaration).
 457     if (GV->use_empty())
 458       GV->eraseFromParent();
 459   }
 460 }
 461
 462 Error lto::thinBackend(Config &Conf, unsigned Task, AddStreamFn AddStream,
 463                        Module &Mod, const ModuleSummaryIndex &CombinedIndex,
 464                        const FunctionImporter::ImportMapTy &ImportList,
 465                        const GVSummaryMapTy &DefinedGlobals,
 466                        MapVector<StringRef, BitcodeModule> &ModuleMap) {
 467   Expected<const Target *> TOrErr = initAndLookupTarget(Conf, Mod);
 468   if (!TOrErr)
 469     return TOrErr.takeError();
 470
 471   std::unique_ptr<TargetMachine> TM = createTargetMachine(Conf, *TOrErr, Mod);
 472
 473   // Setup optimization remarks.
 474   auto DiagFileOrErr = lto::setupOptimizationRemarks(
 475       Mod.getContext(), Conf.RemarksFilename, Conf.RemarksWithHotness, Task);
 476   if (!DiagFileOrErr)
 477     return DiagFileOrErr.takeError();
 478   auto DiagnosticOutputFile = std::move(*DiagFileOrErr);
 479
 480   if (Conf.CodeGenOnly) {
 481     codegen(Conf, TM.get(), AddStream, Task, Mod);
 482     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 483   }
 484
 485   if (Conf.PreOptModuleHook && !Conf.PreOptModuleHook(Task, Mod))
 486     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 487
 488   renameModuleForThinLTO(Mod, CombinedIndex);
 489
 490   dropDeadSymbols(Mod, DefinedGlobals, CombinedIndex);
 491
 492   thinLTOResolvePrevailingInModule(Mod, DefinedGlobals);
 493
 494   if (Conf.PostPromoteModuleHook && !Conf.PostPromoteModuleHook(Task, Mod))
 495     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 496
 497   if (!DefinedGlobals.empty())
 498     thinLTOInternalizeModule(Mod, DefinedGlobals);
 499
 500   if (Conf.PostInternalizeModuleHook &&
 501       !Conf.PostInternalizeModuleHook(Task, Mod))
 502     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 503
 504   auto ModuleLoader = [&](StringRef Identifier) {
 505     assert(Mod.getContext().isODRUniquingDebugTypes() &&
 506            "ODR Type uniquing should be enabled on the context");
 507     auto I = ModuleMap.find(Identifier);
 508     assert(I != ModuleMap.end());
 509     return I->second.getLazyModule(Mod.getContext(),
 510                                    /*ShouldLazyLoadMetadata=*/true,
 511                                    /*IsImporting*/ true);
 512   };
 513
 514   FunctionImporter Importer(CombinedIndex, ModuleLoader);
 515   if (Error Err = Importer.importFunctions(Mod, ImportList).takeError())
 516     return Err;
 517
 518   if (Conf.PostImportModuleHook && !Conf.PostImportModuleHook(Task, Mod))
 519     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 520
 521   if (!opt(Conf, TM.get(), Task, Mod, /*IsThinLTO=*/true,
 522            /*ExportSummary=*/nullptr, /*ImportSummary=*/&CombinedIndex))
 523     return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 524
 525   codegen(Conf, TM.get(), AddStream, Task, Mod);
 526   return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 527 }