1//===-- ASTMerge.cpp - AST Merging Frontent Action --------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#include "clang/Frontend/ASTUnit.h"
10#include "clang/AST/ASTContext.h"
11#include "clang/AST/ASTDiagnostic.h"
12#include "clang/AST/ASTImporter.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                                           StringRef Filename) {
26  // FIXME: This is a hack. We need a better way to communicate the
27  // AST file, compiler instance, and file name than member variables
28  // of FrontendAction.
29  AdaptedAction->setCurrentInput(getCurrentInput(), takeCurrentASTUnit());
30  AdaptedAction->setCompilerInstance(&CI);
31  return AdaptedAction->BeginSourceFileAction(CI, Filename);
32}
33
34void ASTMergeAction::ExecuteAction() {
35  CompilerInstance &CI = getCompilerInstance();
36  CI.getDiagnostics().getClient()->BeginSourceFile(
37                                             CI.getASTContext().getLangOpts());
38  CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
39                                       &CI.getASTContext());
40  IntrusiveRefCntPtr<DiagnosticIDs>
41      DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
42  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
43    IntrusiveRefCntPtr<DiagnosticsEngine>
44        Diags(new DiagnosticsEngine(DiagIDs, &CI.getDiagnosticOpts(),
45                                    new ForwardingDiagnosticConsumer(
46                                          *CI.getDiagnostics().getClient()),
47                                    /*ShouldOwnClient=*/true));
48    std::unique_ptr<ASTUnit> Unit =
49        ASTUnit::LoadFromASTFile(ASTFiles[I], CI.getPCHContainerReader(),
50                                 Diags, CI.getFileSystemOpts(), false);
51
52    if (!Unit)
53      continue;
54
55    ASTImporter Importer(CI.getASTContext(),
56                         CI.getFileManager(),
57                         Unit->getASTContext(),
58                         Unit->getFileManager(),
59                         /*MinimalImport=*/false);
60
61    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
62    for (auto *D : TU->decls()) {
63      // Don't re-import __va_list_tag, __builtin_va_list.
64      if (const auto *ND = dyn_cast<NamedDecl>(D))
65        if (IdentifierInfo *II = ND->getIdentifier())
66          if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
67            continue;
68
69      Decl *ToD = Importer.Import(D);
70
71      if (ToD) {
72        DeclGroupRef DGR(ToD);
73        CI.getASTConsumer().HandleTopLevelDecl(DGR);
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