115 lines · 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-exception6//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 17using namespace clang;18 19std::unique_ptr<ASTConsumer>20ASTMergeAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {21 return AdaptedAction->CreateASTConsumer(CI, InFile);22}23 24bool ASTMergeAction::BeginSourceFileAction(CompilerInstance &CI) {25 // FIXME: This is a hack. We need a better way to communicate the26 // AST file, compiler instance, and file name than member variables27 // of FrontendAction.28 AdaptedAction->setCurrentInput(getCurrentInput(), takeCurrentASTUnit());29 AdaptedAction->setCompilerInstance(&CI);30 return AdaptedAction->BeginSourceFileAction(CI);31}32 33void 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 auto Diags = llvm::makeIntrusiveRefCnt<DiagnosticsEngine>(45 DiagIDs, CI.getDiagnosticOpts(),46 new ForwardingDiagnosticConsumer(*CI.getDiagnostics().getClient()),47 /*ShouldOwnClient=*/true);48 std::unique_ptr<ASTUnit> Unit = ASTUnit::LoadFromASTFile(49 ASTFiles[I], CI.getPCHContainerReader(), ASTUnit::LoadEverything,50 CI.getVirtualFileSystemPtr(), nullptr, Diags, CI.getFileSystemOpts(),51 CI.getHeaderSearchOpts());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 83void ASTMergeAction::EndSourceFileAction() {84 return AdaptedAction->EndSourceFileAction();85}86 87ASTMergeAction::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 93ASTMergeAction::~ASTMergeAction() {94}95 96bool ASTMergeAction::usesPreprocessorOnly() const {97 return AdaptedAction->usesPreprocessorOnly();98}99 100TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {101 return AdaptedAction->getTranslationUnitKind();102}103 104bool ASTMergeAction::hasPCHSupport() const {105 return AdaptedAction->hasPCHSupport();106}107 108bool ASTMergeAction::hasASTFileSupport() const {109 return AdaptedAction->hasASTFileSupport();110}111 112bool ASTMergeAction::hasCodeCompletionSupport() const {113 return AdaptedAction->hasCodeCompletionSupport();114}115