ASTMerge.cpp revision d6471f7c1921c7802804ce3ff6fe9768310f72b9 
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/Frontend/CompilerInstance.h"
11#include "clang/Frontend/FrontendActions.h"
12#include "clang/AST/ASTContext.h"
13#include "clang/AST/ASTDiagnostic.h"
14#include "clang/AST/ASTImporter.h"
15#include "clang/Basic/Diagnostic.h"
16
17using namespace clang;
18
19ASTConsumer *ASTMergeAction::CreateASTConsumer(CompilerInstance &CI,
20                                               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->setCurrentFile(getCurrentFile(), getCurrentFileKind(),
30                                takeCurrentASTUnit());
31  AdaptedAction->setCompilerInstance(&CI);
32  return AdaptedAction->BeginSourceFileAction(CI, Filename);
33}
34
35void ASTMergeAction::ExecuteAction() {
36  CompilerInstance &CI = getCompilerInstance();
37  CI.getDiagnostics().getClient()->BeginSourceFile(
38                                         CI.getASTContext().getLangOptions());
39  CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
40                                       &CI.getASTContext());
41  llvm::IntrusiveRefCntPtr<DiagnosticIDs>
42      DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
43  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
44    llvm::IntrusiveRefCntPtr<DiagnosticsEngine>
45        Diags(new DiagnosticsEngine(DiagIDs, CI.getDiagnostics().getClient(),
46                             /*ShouldOwnClient=*/false));
47    ASTUnit *Unit = ASTUnit::LoadFromASTFile(ASTFiles[I], Diags,
48                                             CI.getFileSystemOpts(), false);
49    if (!Unit)
50      continue;
51
52    ASTImporter Importer(CI.getASTContext(),
53                         CI.getFileManager(),
54                         Unit->getASTContext(),
55                         Unit->getFileManager(),
56                         /*MinimalImport=*/false);
57
58    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
59    for (DeclContext::decl_iterator D = TU->decls_begin(),
60                                 DEnd = TU->decls_end();
61         D != DEnd; ++D) {
62      // Don't re-import __va_list_tag, __builtin_va_list.
63      if (NamedDecl *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      Importer.Import(*D);
69    }
70
71    delete Unit;
72  }
73
74  AdaptedAction->ExecuteAction();
75  CI.getDiagnostics().getClient()->EndSourceFile();
76}
77
78void ASTMergeAction::EndSourceFileAction() {
79  return AdaptedAction->EndSourceFileAction();
80}
81
82ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
83                               std::string *ASTFiles, unsigned NumASTFiles)
84  : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles, ASTFiles + NumASTFiles) {
85  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
86}
87
88ASTMergeAction::~ASTMergeAction() {
89  delete AdaptedAction;
90}
91
92bool ASTMergeAction::usesPreprocessorOnly() const {
93  return AdaptedAction->usesPreprocessorOnly();
94}
95
96TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
97  return AdaptedAction->getTranslationUnitKind();
98}
99
100bool ASTMergeAction::hasPCHSupport() const {
101  return AdaptedAction->hasPCHSupport();
102}
103
104bool ASTMergeAction::hasASTFileSupport() const {
105  return AdaptedAction->hasASTFileSupport();
106}
107
108bool ASTMergeAction::hasCodeCompletionSupport() const {
109  return AdaptedAction->hasCodeCompletionSupport();
110}
111