ASTMerge.cpp revision 210299 
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::LoadFromPCHFile(ASTFiles[I], Diags, false);
44    if (!Unit)
45      continue;
46
47    ASTImporter Importer(CI.getDiagnostics(),
48                         CI.getASTContext(),
49                         CI.getFileManager(),
50                         Unit->getASTContext(),
51                         Unit->getFileManager());
52
53    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
54    for (DeclContext::decl_iterator D = TU->decls_begin(),
55                                 DEnd = TU->decls_end();
56         D != DEnd; ++D) {
57      // Don't re-import __va_list_tag, __builtin_va_list.
58      if (NamedDecl *ND = dyn_cast<NamedDecl>(*D))
59        if (IdentifierInfo *II = ND->getIdentifier())
60          if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
61            continue;
62
63      Importer.Import(*D);
64    }
65
66    delete Unit;
67  }
68
69  AdaptedAction->ExecuteAction();
70  CI.getDiagnostics().getClient()->EndSourceFile();
71}
72
73void ASTMergeAction::EndSourceFileAction() {
74  return AdaptedAction->EndSourceFileAction();
75}
76
77ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
78                               std::string *ASTFiles, unsigned NumASTFiles)
79  : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles, ASTFiles + NumASTFiles) {
80  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
81}
82
83ASTMergeAction::~ASTMergeAction() {
84  delete AdaptedAction;
85}
86
87bool ASTMergeAction::usesPreprocessorOnly() const {
88  return AdaptedAction->usesPreprocessorOnly();
89}
90
91bool ASTMergeAction::usesCompleteTranslationUnit() {
92  return AdaptedAction->usesCompleteTranslationUnit();
93}
94
95bool ASTMergeAction::hasPCHSupport() const {
96  return AdaptedAction->hasPCHSupport();
97}
98
99bool ASTMergeAction::hasASTFileSupport() const {
100  return AdaptedAction->hasASTFileSupport();
101}
102
103bool ASTMergeAction::hasCodeCompletionSupport() const {
104  return AdaptedAction->hasCodeCompletionSupport();
105}
106