ASTMerge.cpp revision 208954 
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(), 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().getLangOptions());
38  CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
39                                       &CI.getASTContext());
40  llvm::IntrusiveRefCntPtr<Diagnostic> Diags(&CI.getDiagnostics());
41  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
42    ASTUnit *Unit = ASTUnit::LoadFromPCHFile(ASTFiles[I], Diags, false);
43    if (!Unit)
44      continue;
45
46    ASTImporter Importer(CI.getDiagnostics(),
47                         CI.getASTContext(),
48                         CI.getFileManager(),
49                         Unit->getASTContext(),
50                         Unit->getFileManager());
51
52    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
53    for (DeclContext::decl_iterator D = TU->decls_begin(),
54                                 DEnd = TU->decls_end();
55         D != DEnd; ++D) {
56      // Don't re-import __va_list_tag, __builtin_va_list.
57      if (NamedDecl *ND = dyn_cast<NamedDecl>(*D))
58        if (IdentifierInfo *II = ND->getIdentifier())
59          if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
60            continue;
61
62      Importer.Import(*D);
63    }
64
65    delete Unit;
66  }
67
68  AdaptedAction->ExecuteAction();
69  CI.getDiagnostics().getClient()->EndSourceFile();
70}
71
72void ASTMergeAction::EndSourceFileAction() {
73  return AdaptedAction->EndSourceFileAction();
74}
75
76ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
77                               std::string *ASTFiles, unsigned NumASTFiles)
78  : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles, ASTFiles + NumASTFiles) {
79  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
80}
81
82ASTMergeAction::~ASTMergeAction() {
83  delete AdaptedAction;
84}
85
86bool ASTMergeAction::usesPreprocessorOnly() const {
87  return AdaptedAction->usesPreprocessorOnly();
88}
89
90bool ASTMergeAction::usesCompleteTranslationUnit() {
91  return AdaptedAction->usesCompleteTranslationUnit();
92}
93
94bool ASTMergeAction::hasPCHSupport() const {
95  return AdaptedAction->hasPCHSupport();
96}
97
98bool ASTMergeAction::hasASTSupport() const {
99  return AdaptedAction->hasASTSupport();
100}
101
102bool ASTMergeAction::hasCodeCompletionSupport() const {
103  return AdaptedAction->hasCodeCompletionSupport();
104}
105