clang/lib/Frontend/ASTMerge.cpp

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