lib/Frontend/ASTMerge.cpp

   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
  17 using namespace clang;
  18
  19 ASTConsumer *ASTMergeAction::CreateASTConsumer(CompilerInstance &CI,
  20                                                llvm::StringRef InFile) {
  21   return AdaptedAction->CreateASTConsumer(CI, InFile);
  22 }
  23
  24 bool 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
  35 void 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<Diagnostic>
  45         Diags(new Diagnostic(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
  78 void ASTMergeAction::EndSourceFileAction() {
  79   return AdaptedAction->EndSourceFileAction();
  80 }
  81
  82 ASTMergeAction::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
  88 ASTMergeAction::~ASTMergeAction() {
  89   delete AdaptedAction;
  90 }
  91
  92 bool ASTMergeAction::usesPreprocessorOnly() const {
  93   return AdaptedAction->usesPreprocessorOnly();
  94 }
  95
  96 bool ASTMergeAction::usesCompleteTranslationUnit() {
  97   return AdaptedAction->usesCompleteTranslationUnit();
  98 }
  99
 100 bool ASTMergeAction::hasPCHSupport() const {
 101   return AdaptedAction->hasPCHSupport();
 102 }
 103
 104 bool ASTMergeAction::hasASTFileSupport() const {
 105   return AdaptedAction->hasASTFileSupport();
 106 }
 107
 108 bool ASTMergeAction::hasCodeCompletionSupport() const {
 109   return AdaptedAction->hasCodeCompletionSupport();
 110 }