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1 //===-- ASTMerge.cpp - AST Merging Frontend Action --------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 #include "clang/Frontend/ASTUnit.h"
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9 #include "clang/AST/ASTContext.h"
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10 #include "clang/AST/ASTDiagnostic.h"
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11 #include "clang/AST/ASTImporter.h"
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12 #include "clang/AST/ASTImporterSharedState.h"
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13 #include "clang/Basic/Diagnostic.h"
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14 #include "clang/Frontend/CompilerInstance.h"
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15 #include "clang/Frontend/FrontendActions.h"
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16
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17 using namespace clang;
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18
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19 std::unique_ptr<ASTConsumer>
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20 ASTMergeAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
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21 return AdaptedAction->CreateASTConsumer(CI, InFile);
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22 }
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23
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24 bool ASTMergeAction::BeginSourceFileAction(CompilerInstance &CI) {
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25 // FIXME: This is a hack. We need a better way to communicate the
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26 // AST file, compiler instance, and file name than member variables
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27 // of FrontendAction.
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28 AdaptedAction->setCurrentInput(getCurrentInput(), takeCurrentASTUnit());
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29 AdaptedAction->setCompilerInstance(&CI);
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30 return AdaptedAction->BeginSourceFileAction(CI);
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31 }
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32
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33 void ASTMergeAction::ExecuteAction() {
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34 CompilerInstance &CI = getCompilerInstance();
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35 CI.getDiagnostics().getClient()->BeginSourceFile(
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36 CI.getASTContext().getLangOpts());
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37 CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
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38 &CI.getASTContext());
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39 IntrusiveRefCntPtr<DiagnosticIDs>
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40 DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
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41 auto SharedState = std::make_shared<ASTImporterSharedState>(
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42 *CI.getASTContext().getTranslationUnitDecl());
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43 for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
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44 IntrusiveRefCntPtr<DiagnosticsEngine>
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45 Diags(new DiagnosticsEngine(DiagIDs, &CI.getDiagnosticOpts(),
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46 new ForwardingDiagnosticConsumer(
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47 *CI.getDiagnostics().getClient()),
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48 /*ShouldOwnClient=*/true));
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49 std::unique_ptr<ASTUnit> Unit = ASTUnit::LoadFromASTFile(
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50 ASTFiles[I], CI.getPCHContainerReader(), ASTUnit::LoadEverything, Diags,
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51 CI.getFileSystemOpts(), false);
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52
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53 if (!Unit)
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54 continue;
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55
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56 ASTImporter Importer(CI.getASTContext(), CI.getFileManager(),
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57 Unit->getASTContext(), Unit->getFileManager(),
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58 /*MinimalImport=*/false, SharedState);
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59
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60 TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
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61 for (auto *D : TU->decls()) {
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62 // Don't re-import __va_list_tag, __builtin_va_list.
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63 if (const auto *ND = dyn_cast<NamedDecl>(D))
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64 if (IdentifierInfo *II = ND->getIdentifier())
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65 if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
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66 continue;
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67
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68 llvm::Expected<Decl *> ToDOrError = Importer.Import(D);
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69
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70 if (ToDOrError) {
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71 DeclGroupRef DGR(*ToDOrError);
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72 CI.getASTConsumer().HandleTopLevelDecl(DGR);
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73 } else {
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74 llvm::consumeError(ToDOrError.takeError());
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75 }
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76 }
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77 }
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78
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79 AdaptedAction->ExecuteAction();
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80 CI.getDiagnostics().getClient()->EndSourceFile();
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81 }
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82
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83 void ASTMergeAction::EndSourceFileAction() {
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84 return AdaptedAction->EndSourceFileAction();
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85 }
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86
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87 ASTMergeAction::ASTMergeAction(std::unique_ptr<FrontendAction> adaptedAction,
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88 ArrayRef<std::string> ASTFiles)
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89 : AdaptedAction(std::move(adaptedAction)), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
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90 assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
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91 }
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92
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93 ASTMergeAction::~ASTMergeAction() {
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94 }
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95
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96 bool ASTMergeAction::usesPreprocessorOnly() const {
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97 return AdaptedAction->usesPreprocessorOnly();
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98 }
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99
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100 TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
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101 return AdaptedAction->getTranslationUnitKind();
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102 }
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103
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104 bool ASTMergeAction::hasPCHSupport() const {
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105 return AdaptedAction->hasPCHSupport();
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106 }
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107
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108 bool ASTMergeAction::hasASTFileSupport() const {
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109 return AdaptedAction->hasASTFileSupport();
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110 }
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111
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112 bool ASTMergeAction::hasCodeCompletionSupport() const {
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113 return AdaptedAction->hasCodeCompletionSupport();
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114 }
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