ASTMerge.cpp revision 3c7f4134603d04b44f997b43c0a9def270f25386 
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                                               llvm::StringRef InFile) {
21  return AdaptedAction->CreateASTConsumer(CI, InFile);
22}
23
24bool ASTMergeAction::BeginSourceFileAction(CompilerInstance &CI,
25                                           llvm::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<Diagnostic> Diags(&CI.getDiagnostics());
42  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
43    ASTUnit *Unit = ASTUnit::LoadFromASTFile(ASTFiles[I], Diags, false);
44    if (!Unit)
45      continue;
46
47    // Reset the argument -> string function so that it has the AST
48    // context we want, since the Sema object created by
49    // LoadFromASTFile will override it.
50    CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
51                                         &CI.getASTContext());
52
53    ASTImporter Importer(CI.getDiagnostics(),
54                         CI.getASTContext(),
55                         CI.getFileManager(),
56                         Unit->getASTContext(),
57                         Unit->getFileManager());
58
59    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
60    for (DeclContext::decl_iterator D = TU->decls_begin(),
61                                 DEnd = TU->decls_end();
62         D != DEnd; ++D) {
63      // Don't re-import __va_list_tag, __builtin_va_list.
64      if (NamedDecl *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      Importer.Import(*D);
70    }
71
72    delete Unit;
73  }
74
75  AdaptedAction->ExecuteAction();
76  CI.getDiagnostics().getClient()->EndSourceFile();
77}
78
79void ASTMergeAction::EndSourceFileAction() {
80  return AdaptedAction->EndSourceFileAction();
81}
82
83ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
84                               std::string *ASTFiles, unsigned NumASTFiles)
85  : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles, ASTFiles + NumASTFiles) {
86  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
87}
88
89ASTMergeAction::~ASTMergeAction() {
90  delete AdaptedAction;
91}
92
93bool ASTMergeAction::usesPreprocessorOnly() const {
94  return AdaptedAction->usesPreprocessorOnly();
95}
96
97bool ASTMergeAction::usesCompleteTranslationUnit() {
98  return AdaptedAction->usesCompleteTranslationUnit();
99}
100
101bool ASTMergeAction::hasPCHSupport() const {
102  return AdaptedAction->hasPCHSupport();
103}
104
105bool ASTMergeAction::hasASTFileSupport() const {
106  return AdaptedAction->hasASTFileSupport();
107}
108
109bool ASTMergeAction::hasCodeCompletionSupport() const {
110  return AdaptedAction->hasCodeCompletionSupport();
111}
112