ASTMerge.cpp revision b3ca2637a9a3aeac5c7103eb4d612528680e7e20 
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->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().getLangOptions());
38  CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
39                                       &CI.getASTContext());
40  llvm::IntrusiveRefCntPtr<DiagnosticIDs>
41      DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
42  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
43    llvm::IntrusiveRefCntPtr<DiagnosticsEngine>
44        Diags(new DiagnosticsEngine(DiagIDs, CI.getDiagnostics().getClient(),
45                             /*ShouldOwnClient=*/false));
46    ASTUnit *Unit = ASTUnit::LoadFromASTFile(ASTFiles[I], Diags,
47                                             CI.getFileSystemOpts(), false);
48    if (!Unit)
49      continue;
50
51    ASTImporter Importer(CI.getASTContext(),
52                         CI.getFileManager(),
53                         Unit->getASTContext(),
54                         Unit->getFileManager(),
55                         /*MinimalImport=*/false);
56
57    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
58    for (DeclContext::decl_iterator D = TU->decls_begin(),
59                                 DEnd = TU->decls_end();
60         D != DEnd; ++D) {
61      // Don't re-import __va_list_tag, __builtin_va_list.
62      if (NamedDecl *ND = dyn_cast<NamedDecl>(*D))
63        if (IdentifierInfo *II = ND->getIdentifier())
64          if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
65            continue;
66
67      Importer.Import(*D);
68    }
69
70    delete Unit;
71  }
72
73  AdaptedAction->ExecuteAction();
74  CI.getDiagnostics().getClient()->EndSourceFile();
75}
76
77void ASTMergeAction::EndSourceFileAction() {
78  return AdaptedAction->EndSourceFileAction();
79}
80
81ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
82                               ArrayRef<std::string> ASTFiles)
83  : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
84  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
85}
86
87ASTMergeAction::~ASTMergeAction() {
88  delete AdaptedAction;
89}
90
91bool ASTMergeAction::usesPreprocessorOnly() const {
92  return AdaptedAction->usesPreprocessorOnly();
93}
94
95TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
96  return AdaptedAction->getTranslationUnitKind();
97}
98
99bool ASTMergeAction::hasPCHSupport() const {
100  return AdaptedAction->hasPCHSupport();
101}
102
103bool ASTMergeAction::hasASTFileSupport() const {
104  return AdaptedAction->hasASTFileSupport();
105}
106
107bool ASTMergeAction::hasCodeCompletionSupport() const {
108  return AdaptedAction->hasCodeCompletionSupport();
109}
110