예제 #1
0
/// Performs the compile requested by the user.
/// \returns true on error
static bool performCompile(CompilerInstance &Instance,
                           CompilerInvocation &Invocation,
                           ArrayRef<const char *> Args,
                           int &ReturnValue) {
  FrontendOptions opts = Invocation.getFrontendOptions();
  FrontendOptions::ActionType Action = opts.RequestedAction;

  IRGenOptions &IRGenOpts = Invocation.getIRGenOptions();

  bool inputIsLLVMIr = Invocation.getInputKind() == InputFileKind::IFK_LLVM_IR;
  if (inputIsLLVMIr) {
    auto &LLVMContext = llvm::getGlobalContext();

    // Load in bitcode file.
    assert(Invocation.getInputFilenames().size() == 1 &&
           "We expect a single input for bitcode input!");
    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> FileBufOrErr =
      llvm::MemoryBuffer::getFileOrSTDIN(Invocation.getInputFilenames()[0]);
    if (!FileBufOrErr) {
      Instance.getASTContext().Diags.diagnose(SourceLoc(),
                                              diag::error_open_input_file,
                                              Invocation.getInputFilenames()[0],
                                              FileBufOrErr.getError().message());
      return true;
    }
    llvm::MemoryBuffer *MainFile = FileBufOrErr.get().get();

    llvm::SMDiagnostic Err;
    std::unique_ptr<llvm::Module> Module = llvm::parseIR(
                                             MainFile->getMemBufferRef(),
                                             Err, LLVMContext);
    if (!Module) {
      // TODO: Translate from the diagnostic info to the SourceManager location
      // if available.
      Instance.getASTContext().Diags.diagnose(SourceLoc(),
                                              diag::error_parse_input_file,
                                              Invocation.getInputFilenames()[0],
                                              Err.getMessage());
      return true;
    }

    // TODO: remove once the frontend understands what action it should perform
    IRGenOpts.OutputKind = getOutputKind(Action);

    return performLLVM(IRGenOpts, Instance.getASTContext(), Module.get());
  }

  ReferencedNameTracker nameTracker;
  bool shouldTrackReferences = !opts.ReferenceDependenciesFilePath.empty();
  if (shouldTrackReferences)
    Instance.setReferencedNameTracker(&nameTracker);

  if (Action == FrontendOptions::DumpParse ||
      Action == FrontendOptions::DumpInterfaceHash)
    Instance.performParseOnly();
  else
    Instance.performSema();

  FrontendOptions::DebugCrashMode CrashMode = opts.CrashMode;
  if (CrashMode == FrontendOptions::DebugCrashMode::AssertAfterParse)
    debugFailWithAssertion();
  else if (CrashMode == FrontendOptions::DebugCrashMode::CrashAfterParse)
    debugFailWithCrash();

  ASTContext &Context = Instance.getASTContext();

  if (Action == FrontendOptions::REPL) {
    runREPL(Instance, ProcessCmdLine(Args.begin(), Args.end()),
            Invocation.getParseStdlib());
    return false;
  }

  SourceFile *PrimarySourceFile = Instance.getPrimarySourceFile();

  // We've been told to dump the AST (either after parsing or type-checking,
  // which is already differentiated in CompilerInstance::performSema()),
  // so dump or print the main source file and return.
  if (Action == FrontendOptions::DumpParse ||
      Action == FrontendOptions::DumpAST ||
      Action == FrontendOptions::PrintAST ||
      Action == FrontendOptions::DumpTypeRefinementContexts ||
      Action == FrontendOptions::DumpInterfaceHash) {
    SourceFile *SF = PrimarySourceFile;
    if (!SF) {
      SourceFileKind Kind = Invocation.getSourceFileKind();
      SF = &Instance.getMainModule()->getMainSourceFile(Kind);
    }
    if (Action == FrontendOptions::PrintAST)
      SF->print(llvm::outs(), PrintOptions::printEverything());
    else if (Action == FrontendOptions::DumpTypeRefinementContexts)
      SF->getTypeRefinementContext()->dump(llvm::errs(), Context.SourceMgr);
    else if (Action == FrontendOptions::DumpInterfaceHash)
      SF->dumpInterfaceHash(llvm::errs());
    else
      SF->dump();
    return false;
  }

  // If we were asked to print Clang stats, do so.
  if (opts.PrintClangStats && Context.getClangModuleLoader())
    Context.getClangModuleLoader()->printStatistics();

  if (!opts.DependenciesFilePath.empty())
    (void)emitMakeDependencies(Context.Diags, *Instance.getDependencyTracker(),
                               opts);

  if (shouldTrackReferences)
    emitReferenceDependencies(Context.Diags, Instance.getPrimarySourceFile(),
                              *Instance.getDependencyTracker(), opts);

  if (Context.hadError())
    return true;

  // FIXME: This is still a lousy approximation of whether the module file will
  // be externally consumed.
  bool moduleIsPublic =
      !Instance.getMainModule()->hasEntryPoint() &&
      opts.ImplicitObjCHeaderPath.empty() &&
      !Context.LangOpts.EnableAppExtensionRestrictions;

  // We've just been told to perform a parse, so we can return now.
  if (Action == FrontendOptions::Parse) {
    if (!opts.ObjCHeaderOutputPath.empty())
      return printAsObjC(opts.ObjCHeaderOutputPath, Instance.getMainModule(),
                         opts.ImplicitObjCHeaderPath, moduleIsPublic);
    return false;
  }

  assert(Action >= FrontendOptions::EmitSILGen &&
         "All actions not requiring SILGen must have been handled!");

  std::unique_ptr<SILModule> SM = Instance.takeSILModule();
  if (!SM) {
    if (opts.PrimaryInput.hasValue() && opts.PrimaryInput.getValue().isFilename()) {
      FileUnit *PrimaryFile = PrimarySourceFile;
      if (!PrimaryFile) {
        auto Index = opts.PrimaryInput.getValue().Index;
        PrimaryFile = Instance.getMainModule()->getFiles()[Index];
      }
      SM = performSILGeneration(*PrimaryFile, Invocation.getSILOptions(),
                                None, opts.SILSerializeAll);
    } else {
      SM = performSILGeneration(Instance.getMainModule(), Invocation.getSILOptions(),
                                opts.SILSerializeAll,
                                true);
    }
  }

  // We've been told to emit SIL after SILGen, so write it now.
  if (Action == FrontendOptions::EmitSILGen) {
    // If we are asked to link all, link all.
    if (Invocation.getSILOptions().LinkMode == SILOptions::LinkAll)
      performSILLinking(SM.get(), true);
    return writeSIL(*SM, Instance.getMainModule(), opts.EmitVerboseSIL,
                    opts.getSingleOutputFilename(), opts.EmitSortedSIL);
  }

  if (Action == FrontendOptions::EmitSIBGen) {
    // If we are asked to link all, link all.
    if (Invocation.getSILOptions().LinkMode == SILOptions::LinkAll)
      performSILLinking(SM.get(), true);

    auto DC = PrimarySourceFile ? ModuleOrSourceFile(PrimarySourceFile) :
                                  Instance.getMainModule();
    if (!opts.ModuleOutputPath.empty()) {
      SerializationOptions serializationOpts;
      serializationOpts.OutputPath = opts.ModuleOutputPath.c_str();
      serializationOpts.SerializeAllSIL = true;
      serializationOpts.IsSIB = true;

      serialize(DC, serializationOpts, SM.get());
    }
    return false;
  }

  // Perform "stable" optimizations that are invariant across compiler versions.
  if (!Invocation.getDiagnosticOptions().SkipDiagnosticPasses &&
      runSILDiagnosticPasses(*SM))
    return true;

  // Now if we are asked to link all, link all.
  if (Invocation.getSILOptions().LinkMode == SILOptions::LinkAll)
    performSILLinking(SM.get(), true);

  SM->verify();

  // Perform SIL optimization passes if optimizations haven't been disabled.
  // These may change across compiler versions.
  if (IRGenOpts.Optimize) {
    StringRef CustomPipelinePath =
      Invocation.getSILOptions().ExternalPassPipelineFilename;
    if (!CustomPipelinePath.empty()) {
      runSILOptimizationPassesWithFileSpecification(*SM, CustomPipelinePath);
    } else {
      runSILOptimizationPasses(*SM);
    }
  } else {
    runSILPassesForOnone(*SM);
  }
  SM->verify();

  // Gather instruction counts if we are asked to do so.
  if (SM->getOptions().PrintInstCounts) {
    performSILInstCount(&*SM);
  }

  // Get the main source file's private discriminator and attach it to
  // the compile unit's flags.
  if (PrimarySourceFile) {
    Identifier PD = PrimarySourceFile->getPrivateDiscriminator();
    if (!PD.empty())
      IRGenOpts.DWARFDebugFlags += (" -private-discriminator "+PD.str()).str();
  }

  if (!opts.ObjCHeaderOutputPath.empty()) {
    (void)printAsObjC(opts.ObjCHeaderOutputPath, Instance.getMainModule(),
                      opts.ImplicitObjCHeaderPath, moduleIsPublic);
  }

  if (Action == FrontendOptions::EmitSIB) {
    auto DC = PrimarySourceFile ? ModuleOrSourceFile(PrimarySourceFile) :
                                  Instance.getMainModule();
    if (!opts.ModuleOutputPath.empty()) {
      SerializationOptions serializationOpts;
      serializationOpts.OutputPath = opts.ModuleOutputPath.c_str();
      serializationOpts.SerializeAllSIL = true;
      serializationOpts.IsSIB = true;

      serialize(DC, serializationOpts, SM.get());
    }
    return false;
  }

  if (!opts.ModuleOutputPath.empty() || !opts.ModuleDocOutputPath.empty()) {
    auto DC = PrimarySourceFile ? ModuleOrSourceFile(PrimarySourceFile) :
                                  Instance.getMainModule();
    if (!opts.ModuleOutputPath.empty()) {
      SerializationOptions serializationOpts;
      serializationOpts.OutputPath = opts.ModuleOutputPath.c_str();
      serializationOpts.DocOutputPath = opts.ModuleDocOutputPath.c_str();
      serializationOpts.SerializeAllSIL = opts.SILSerializeAll;
      if (opts.SerializeBridgingHeader)
        serializationOpts.ImportedHeader = opts.ImplicitObjCHeaderPath;
      serializationOpts.ModuleLinkName = opts.ModuleLinkName;
      serializationOpts.ExtraClangOptions =
          Invocation.getClangImporterOptions().ExtraArgs;
      if (!IRGenOpts.ForceLoadSymbolName.empty())
        serializationOpts.AutolinkForceLoad = true;

      // Options contain information about the developer's computer,
      // so only serialize them if the module isn't going to be shipped to
      // the public.
      serializationOpts.SerializeOptionsForDebugging =
          !moduleIsPublic || opts.AlwaysSerializeDebuggingOptions;

      serialize(DC, serializationOpts, SM.get());
    }

    if (Action == FrontendOptions::EmitModuleOnly)
      return false;
  }

  assert(Action >= FrontendOptions::EmitSIL &&
         "All actions not requiring SILPasses must have been handled!");

  // We've been told to write canonical SIL, so write it now.
  if (Action == FrontendOptions::EmitSIL) {
    return writeSIL(*SM, Instance.getMainModule(), opts.EmitVerboseSIL,
                    opts.getSingleOutputFilename(), opts.EmitSortedSIL);
  }

  assert(Action >= FrontendOptions::Immediate &&
         "All actions not requiring IRGen must have been handled!");
  assert(Action != FrontendOptions::REPL &&
         "REPL mode must be handled immediately after Instance.performSema()");

  // Check if we had any errors; if we did, don't proceed to IRGen.
  if (Context.hadError())
    return true;

  // Cleanup instructions/builtin calls not suitable for IRGen.
  performSILCleanup(SM.get());

  // TODO: remove once the frontend understands what action it should perform
  IRGenOpts.OutputKind = getOutputKind(Action);
  if (Action == FrontendOptions::Immediate) {
    assert(!PrimarySourceFile && "-i doesn't work in -primary-file mode");
    IRGenOpts.UseJIT = true;
    IRGenOpts.DebugInfoKind = IRGenDebugInfoKind::Normal;
    const ProcessCmdLine &CmdLine = ProcessCmdLine(opts.ImmediateArgv.begin(),
                                                   opts.ImmediateArgv.end());
    Instance.setSILModule(std::move(SM));
    ReturnValue =
      RunImmediately(Instance, CmdLine, IRGenOpts, Invocation.getSILOptions());
    return false;
  }

  // FIXME: We shouldn't need to use the global context here, but
  // something is persisting across calls to performIRGeneration.
  auto &LLVMContext = llvm::getGlobalContext();
  if (PrimarySourceFile) {
    performIRGeneration(IRGenOpts, *PrimarySourceFile, SM.get(),
                        opts.getSingleOutputFilename(), LLVMContext);
  } else {
    performIRGeneration(IRGenOpts, Instance.getMainModule(), SM.get(),
                        opts.getSingleOutputFilename(), LLVMContext);
  }

  return false;
}
예제 #2
0
/// Performs the compile requested by the user.
/// \param Instance Will be reset after performIRGeneration when the verifier
///                 mode is NoVerify and there were no errors.
/// \returns true on error
static bool performCompile(std::unique_ptr<CompilerInstance> &Instance,
                           CompilerInvocation &Invocation,
                           ArrayRef<const char *> Args,
                           int &ReturnValue,
                           FrontendObserver *observer) {
  FrontendOptions opts = Invocation.getFrontendOptions();
  FrontendOptions::ActionType Action = opts.RequestedAction;

  IRGenOptions &IRGenOpts = Invocation.getIRGenOptions();

  bool inputIsLLVMIr = Invocation.getInputKind() == InputFileKind::IFK_LLVM_IR;
  if (inputIsLLVMIr) {
    auto &LLVMContext = getGlobalLLVMContext();

    // Load in bitcode file.
    assert(Invocation.getInputFilenames().size() == 1 &&
           "We expect a single input for bitcode input!");
    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> FileBufOrErr =
      llvm::MemoryBuffer::getFileOrSTDIN(Invocation.getInputFilenames()[0]);
    if (!FileBufOrErr) {
      Instance->getASTContext().Diags.diagnose(SourceLoc(),
                                              diag::error_open_input_file,
                                              Invocation.getInputFilenames()[0],
                                              FileBufOrErr.getError().message());
      return true;
    }
    llvm::MemoryBuffer *MainFile = FileBufOrErr.get().get();

    llvm::SMDiagnostic Err;
    std::unique_ptr<llvm::Module> Module = llvm::parseIR(
                                             MainFile->getMemBufferRef(),
                                             Err, LLVMContext);
    if (!Module) {
      // TODO: Translate from the diagnostic info to the SourceManager location
      // if available.
      Instance->getASTContext().Diags.diagnose(SourceLoc(),
                                              diag::error_parse_input_file,
                                              Invocation.getInputFilenames()[0],
                                              Err.getMessage());
      return true;
    }

    // TODO: remove once the frontend understands what action it should perform
    IRGenOpts.OutputKind = getOutputKind(Action);

    return performLLVM(IRGenOpts, Instance->getASTContext(), Module.get());
  }

  ReferencedNameTracker nameTracker;
  bool shouldTrackReferences = !opts.ReferenceDependenciesFilePath.empty();
  if (shouldTrackReferences)
    Instance->setReferencedNameTracker(&nameTracker);

  if (Action == FrontendOptions::Parse ||
      Action == FrontendOptions::DumpParse ||
      Action == FrontendOptions::DumpInterfaceHash)
    Instance->performParseOnly();
  else
    Instance->performSema();

  if (Action == FrontendOptions::Parse)
    return Instance->getASTContext().hadError();

  if (observer) {
    observer->performedSemanticAnalysis(*Instance);
  }

  FrontendOptions::DebugCrashMode CrashMode = opts.CrashMode;
  if (CrashMode == FrontendOptions::DebugCrashMode::AssertAfterParse)
    debugFailWithAssertion();
  else if (CrashMode == FrontendOptions::DebugCrashMode::CrashAfterParse)
    debugFailWithCrash();

  ASTContext &Context = Instance->getASTContext();

  if (Action == FrontendOptions::REPL) {
    runREPL(*Instance, ProcessCmdLine(Args.begin(), Args.end()),
            Invocation.getParseStdlib());
    return Context.hadError();
  }

  SourceFile *PrimarySourceFile = Instance->getPrimarySourceFile();

  // We've been told to dump the AST (either after parsing or type-checking,
  // which is already differentiated in CompilerInstance::performSema()),
  // so dump or print the main source file and return.
  if (Action == FrontendOptions::DumpParse ||
      Action == FrontendOptions::DumpAST ||
      Action == FrontendOptions::PrintAST ||
      Action == FrontendOptions::DumpScopeMaps ||
      Action == FrontendOptions::DumpTypeRefinementContexts ||
      Action == FrontendOptions::DumpInterfaceHash) {
    SourceFile *SF = PrimarySourceFile;
    if (!SF) {
      SourceFileKind Kind = Invocation.getSourceFileKind();
      SF = &Instance->getMainModule()->getMainSourceFile(Kind);
    }
    if (Action == FrontendOptions::PrintAST)
      SF->print(llvm::outs(), PrintOptions::printEverything());
    else if (Action == FrontendOptions::DumpScopeMaps) {
      ASTScope &scope = SF->getScope();

      if (opts.DumpScopeMapLocations.empty()) {
        scope.expandAll();
      } else if (auto bufferID = SF->getBufferID()) {
        SourceManager &sourceMgr = Instance->getSourceMgr();
        // Probe each of the locations, and dump what we find.
        for (auto lineColumn : opts.DumpScopeMapLocations) {
          SourceLoc loc = sourceMgr.getLocForLineCol(*bufferID,
                                                     lineColumn.first,
                                                     lineColumn.second);
          if (loc.isInvalid()) continue;

          llvm::errs() << "***Scope at " << lineColumn.first << ":"
            << lineColumn.second << "***\n";
          auto locScope = scope.findInnermostEnclosingScope(loc);
          locScope->print(llvm::errs(), 0, false, false);

          // Dump the AST context, too.
          if (auto dc = locScope->getDeclContext()) {
            dc->printContext(llvm::errs());
          }

          // Grab the local bindings introduced by this scope.
          auto localBindings = locScope->getLocalBindings();
          if (!localBindings.empty()) {
            llvm::errs() << "Local bindings: ";
            interleave(localBindings.begin(), localBindings.end(),
                       [&](ValueDecl *value) {
                         llvm::errs() << value->getFullName();
                       },
                       [&]() {
                         llvm::errs() << " ";
                       });
            llvm::errs() << "\n";
          }
        }

        llvm::errs() << "***Complete scope map***\n";
      }

      // Print the resulting map.
      scope.print(llvm::errs());
    } else if (Action == FrontendOptions::DumpTypeRefinementContexts)
      SF->getTypeRefinementContext()->dump(llvm::errs(), Context.SourceMgr);
    else if (Action == FrontendOptions::DumpInterfaceHash)
      SF->dumpInterfaceHash(llvm::errs());
    else
      SF->dump();
    return Context.hadError();
  }

  // If we were asked to print Clang stats, do so.
  if (opts.PrintClangStats && Context.getClangModuleLoader())
    Context.getClangModuleLoader()->printStatistics();

  if (!opts.DependenciesFilePath.empty())
    (void)emitMakeDependencies(Context.Diags, *Instance->getDependencyTracker(),
                               opts);

  if (shouldTrackReferences)
    emitReferenceDependencies(Context.Diags, Instance->getPrimarySourceFile(),
                              *Instance->getDependencyTracker(), opts);

  if (Context.hadError())
    return true;

  // FIXME: This is still a lousy approximation of whether the module file will
  // be externally consumed.
  bool moduleIsPublic =
      !Instance->getMainModule()->hasEntryPoint() &&
      opts.ImplicitObjCHeaderPath.empty() &&
      !Context.LangOpts.EnableAppExtensionRestrictions;

  // We've just been told to perform a typecheck, so we can return now.
  if (Action == FrontendOptions::Typecheck) {
    if (!opts.ObjCHeaderOutputPath.empty())
      return printAsObjC(opts.ObjCHeaderOutputPath, Instance->getMainModule(),
                         opts.ImplicitObjCHeaderPath, moduleIsPublic);
    return Context.hadError();
  }

  assert(Action >= FrontendOptions::EmitSILGen &&
         "All actions not requiring SILGen must have been handled!");

  std::unique_ptr<SILModule> SM = Instance->takeSILModule();
  if (!SM) {
    if (opts.PrimaryInput.hasValue() && opts.PrimaryInput.getValue().isFilename()) {
      FileUnit *PrimaryFile = PrimarySourceFile;
      if (!PrimaryFile) {
        auto Index = opts.PrimaryInput.getValue().Index;
        PrimaryFile = Instance->getMainModule()->getFiles()[Index];
      }
      SM = performSILGeneration(*PrimaryFile, Invocation.getSILOptions(),
                                None, opts.SILSerializeAll);
    } else {
      SM = performSILGeneration(Instance->getMainModule(), Invocation.getSILOptions(),
                                opts.SILSerializeAll,
                                true);
    }
  }

  if (observer) {
    observer->performedSILGeneration(*SM);
  }

  // We've been told to emit SIL after SILGen, so write it now.
  if (Action == FrontendOptions::EmitSILGen) {
    // If we are asked to link all, link all.
    if (Invocation.getSILOptions().LinkMode == SILOptions::LinkAll)
      performSILLinking(SM.get(), true);
    return writeSIL(*SM, Instance->getMainModule(), opts.EmitVerboseSIL,
                    opts.getSingleOutputFilename(), opts.EmitSortedSIL);
  }

  if (Action == FrontendOptions::EmitSIBGen) {
    // If we are asked to link all, link all.
    if (Invocation.getSILOptions().LinkMode == SILOptions::LinkAll)
      performSILLinking(SM.get(), true);

    auto DC = PrimarySourceFile ? ModuleOrSourceFile(PrimarySourceFile) :
                                  Instance->getMainModule();
    if (!opts.ModuleOutputPath.empty()) {
      SerializationOptions serializationOpts;
      serializationOpts.OutputPath = opts.ModuleOutputPath.c_str();
      serializationOpts.SerializeAllSIL = true;
      serializationOpts.IsSIB = true;

      serialize(DC, serializationOpts, SM.get());
    }
    return Context.hadError();
  }

  // Perform "stable" optimizations that are invariant across compiler versions.
  if (!Invocation.getDiagnosticOptions().SkipDiagnosticPasses) {
    if (runSILDiagnosticPasses(*SM))
      return true;

    if (observer) {
      observer->performedSILDiagnostics(*SM);
    }
  } else {
    // Even if we are not supposed to run the diagnostic passes, we still need
    // to run the ownership evaluator.
    if (runSILOwnershipEliminatorPass(*SM))
      return true;
  }

  // Now if we are asked to link all, link all.
  if (Invocation.getSILOptions().LinkMode == SILOptions::LinkAll)
    performSILLinking(SM.get(), true);

  {
    SharedTimer timer("SIL verification (pre-optimization)");
    SM->verify();
  }

  // Perform SIL optimization passes if optimizations haven't been disabled.
  // These may change across compiler versions.
  {
    SharedTimer timer("SIL optimization");
    if (Invocation.getSILOptions().Optimization >
        SILOptions::SILOptMode::None) {
      StringRef CustomPipelinePath =
        Invocation.getSILOptions().ExternalPassPipelineFilename;
      if (!CustomPipelinePath.empty()) {
        runSILOptimizationPassesWithFileSpecification(*SM, CustomPipelinePath);
      } else {
        runSILOptimizationPasses(*SM);
      }
    } else {
      runSILPassesForOnone(*SM);
    }
  }

  if (observer) {
    observer->performedSILOptimization(*SM);
  }

  {
    SharedTimer timer("SIL verification (post-optimization)");
    SM->verify();
  }

  // Gather instruction counts if we are asked to do so.
  if (SM->getOptions().PrintInstCounts) {
    performSILInstCount(&*SM);
  }

  // Get the main source file's private discriminator and attach it to
  // the compile unit's flags.
  if (PrimarySourceFile) {
    Identifier PD = PrimarySourceFile->getPrivateDiscriminator();
    if (!PD.empty())
      IRGenOpts.DWARFDebugFlags += (" -private-discriminator "+PD.str()).str();
  }

  if (!opts.ObjCHeaderOutputPath.empty()) {
    (void)printAsObjC(opts.ObjCHeaderOutputPath, Instance->getMainModule(),
                      opts.ImplicitObjCHeaderPath, moduleIsPublic);
  }

  if (Action == FrontendOptions::EmitSIB) {
    auto DC = PrimarySourceFile ? ModuleOrSourceFile(PrimarySourceFile) :
                                  Instance->getMainModule();
    if (!opts.ModuleOutputPath.empty()) {
      SerializationOptions serializationOpts;
      serializationOpts.OutputPath = opts.ModuleOutputPath.c_str();
      serializationOpts.SerializeAllSIL = true;
      serializationOpts.IsSIB = true;

      serialize(DC, serializationOpts, SM.get());
    }
    return Context.hadError();
  }

  if (!opts.ModuleOutputPath.empty() || !opts.ModuleDocOutputPath.empty()) {
    auto DC = PrimarySourceFile ? ModuleOrSourceFile(PrimarySourceFile) :
                                  Instance->getMainModule();
    if (!opts.ModuleOutputPath.empty()) {
      SerializationOptions serializationOpts;
      serializationOpts.OutputPath = opts.ModuleOutputPath.c_str();
      serializationOpts.DocOutputPath = opts.ModuleDocOutputPath.c_str();
      serializationOpts.GroupInfoPath = opts.GroupInfoPath.c_str();
      serializationOpts.SerializeAllSIL = opts.SILSerializeAll;
      if (opts.SerializeBridgingHeader)
        serializationOpts.ImportedHeader = opts.ImplicitObjCHeaderPath;
      serializationOpts.ModuleLinkName = opts.ModuleLinkName;
      serializationOpts.ExtraClangOptions =
          Invocation.getClangImporterOptions().ExtraArgs;
      if (!IRGenOpts.ForceLoadSymbolName.empty())
        serializationOpts.AutolinkForceLoad = true;

      // Options contain information about the developer's computer,
      // so only serialize them if the module isn't going to be shipped to
      // the public.
      serializationOpts.SerializeOptionsForDebugging =
          !moduleIsPublic || opts.AlwaysSerializeDebuggingOptions;

      serialize(DC, serializationOpts, SM.get());
    }

    if (Action == FrontendOptions::EmitModuleOnly)
      return Context.hadError();
  }

  assert(Action >= FrontendOptions::EmitSIL &&
         "All actions not requiring SILPasses must have been handled!");

  // We've been told to write canonical SIL, so write it now.
  if (Action == FrontendOptions::EmitSIL) {
    return writeSIL(*SM, Instance->getMainModule(), opts.EmitVerboseSIL,
                    opts.getSingleOutputFilename(), opts.EmitSortedSIL);
  }

  assert(Action >= FrontendOptions::Immediate &&
         "All actions not requiring IRGen must have been handled!");
  assert(Action != FrontendOptions::REPL &&
         "REPL mode must be handled immediately after Instance->performSema()");

  // Check if we had any errors; if we did, don't proceed to IRGen.
  if (Context.hadError())
    return true;

  // Cleanup instructions/builtin calls not suitable for IRGen.
  performSILCleanup(SM.get());

  // TODO: remove once the frontend understands what action it should perform
  IRGenOpts.OutputKind = getOutputKind(Action);
  if (Action == FrontendOptions::Immediate) {
    assert(!PrimarySourceFile && "-i doesn't work in -primary-file mode");
    IRGenOpts.UseJIT = true;
    IRGenOpts.DebugInfoKind = IRGenDebugInfoKind::Normal;
    const ProcessCmdLine &CmdLine = ProcessCmdLine(opts.ImmediateArgv.begin(),
                                                   opts.ImmediateArgv.end());
    Instance->setSILModule(std::move(SM));

    if (observer) {
      observer->aboutToRunImmediately(*Instance);
    }

    ReturnValue =
      RunImmediately(*Instance, CmdLine, IRGenOpts, Invocation.getSILOptions());
    return Context.hadError();
  }

  // FIXME: We shouldn't need to use the global context here, but
  // something is persisting across calls to performIRGeneration.
  auto &LLVMContext = getGlobalLLVMContext();
  std::unique_ptr<llvm::Module> IRModule;
  llvm::GlobalVariable *HashGlobal;
  if (PrimarySourceFile) {
    IRModule = performIRGeneration(IRGenOpts, *PrimarySourceFile, std::move(SM),
                                   opts.getSingleOutputFilename(), LLVMContext,
                                   0, &HashGlobal);
  } else {
    IRModule = performIRGeneration(IRGenOpts, Instance->getMainModule(),
                                   std::move(SM),
                                   opts.getSingleOutputFilename(), LLVMContext,
                                   &HashGlobal);
  }

  // Just because we had an AST error it doesn't mean we can't performLLVM.
  bool HadError = Instance->getASTContext().hadError();
  
  // If the AST Context has no errors but no IRModule is available,
  // parallelIRGen happened correctly, since parallel IRGen produces multiple
  // modules.
  if (!IRModule) {
    return HadError;
  }

  std::unique_ptr<llvm::TargetMachine> TargetMachine =
    createTargetMachine(IRGenOpts, Context);
  version::Version EffectiveLanguageVersion =
    Context.LangOpts.EffectiveLanguageVersion;
  DiagnosticEngine &Diags = Context.Diags;
  const DiagnosticOptions &DiagOpts = Invocation.getDiagnosticOptions();
  
  // Delete the compiler instance now that we have an IRModule.
  if (DiagOpts.VerifyMode == DiagnosticOptions::NoVerify) {
    SM.reset();
    Instance.reset();
  }
  
  // Now that we have a single IR Module, hand it over to performLLVM.
  return performLLVM(IRGenOpts, &Diags, nullptr, HashGlobal, IRModule.get(),
                  TargetMachine.get(), EffectiveLanguageVersion,
                  opts.getSingleOutputFilename()) || HadError;
}