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
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 the
26 // AST file, compiler instance, and file name than member variables
27 // of FrontendAction.
28 AdaptedAction->setCurrentInput(CurrentInput: getCurrentInput(), AST: 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 LangOpts: CI.getASTContext().getLangOpts());
37 CI.getDiagnostics().SetArgToStringFn(Fn: &FormatASTNodeDiagnosticArgument,
38 Cookie: &CI.getASTContext());
39 IntrusiveRefCntPtr<DiagnosticIDs>
40 DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
41 auto SharedState = std::make_shared<ASTImporterSharedState>(
42 args&: *CI.getASTContext().getTranslationUnitDecl());
43 for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
44 IntrusiveRefCntPtr<DiagnosticsEngine> Diags(new DiagnosticsEngine(
45 DiagIDs, CI.getDiagnosticOpts(),
46 new ForwardingDiagnosticConsumer(*CI.getDiagnostics().getClient()),
47 /*ShouldOwnClient=*/true));
48 std::unique_ptr<ASTUnit> Unit = ASTUnit::LoadFromASTFile(
49 Filename: ASTFiles[I], PCHContainerRdr: CI.getPCHContainerReader(), ToLoad: ASTUnit::LoadEverything,
50 DiagOpts: nullptr, Diags, FileSystemOpts: CI.getFileSystemOpts(), HSOpts: CI.getHeaderSearchOpts());
51
52 if (!Unit)
53 continue;
54
55 ASTImporter Importer(CI.getASTContext(), CI.getFileManager(),
56 Unit->getASTContext(), Unit->getFileManager(),
57 /*MinimalImport=*/false, SharedState);
58
59 TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
60 for (auto *D : TU->decls()) {
61 // Don't re-import __va_list_tag, __builtin_va_list.
62 if (const auto *ND = dyn_cast<NamedDecl>(Val: D))
63 if (IdentifierInfo *II = ND->getIdentifier())
64 if (II->isStr(Str: "__va_list_tag") || II->isStr(Str: "__builtin_va_list"))
65 continue;
66
67 llvm::Expected<Decl *> ToDOrError = Importer.Import(FromD: D);
68
69 if (ToDOrError) {
70 DeclGroupRef DGR(*ToDOrError);
71 CI.getASTConsumer().HandleTopLevelDecl(D: DGR);
72 } else {
73 llvm::consumeError(Err: ToDOrError.takeError());
74 }
75 }
76 }
77
78 AdaptedAction->ExecuteAction();
79 CI.getDiagnostics().getClient()->EndSourceFile();
80}
81
82void ASTMergeAction::EndSourceFileAction() {
83 return AdaptedAction->EndSourceFileAction();
84}
85
86ASTMergeAction::ASTMergeAction(std::unique_ptr<FrontendAction> adaptedAction,
87 ArrayRef<std::string> ASTFiles)
88: AdaptedAction(std::move(adaptedAction)), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
89 assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
90}
91
92ASTMergeAction::~ASTMergeAction() {
93}
94
95bool ASTMergeAction::usesPreprocessorOnly() const {
96 return AdaptedAction->usesPreprocessorOnly();
97}
98
99TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
100 return AdaptedAction->getTranslationUnitKind();
101}
102
103bool ASTMergeAction::hasPCHSupport() const {
104 return AdaptedAction->hasPCHSupport();
105}
106
107bool ASTMergeAction::hasASTFileSupport() const {
108 return AdaptedAction->hasASTFileSupport();
109}
110
111bool ASTMergeAction::hasCodeCompletionSupport() const {
112 return AdaptedAction->hasCodeCompletionSupport();
113}
114