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      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/AST/ASTContext.h"
     11 #include "clang/AST/ASTDiagnostic.h"
     12 #include "clang/AST/ASTImporter.h"
     13 #include "clang/Basic/Diagnostic.h"
     14 #include "clang/Frontend/CompilerInstance.h"
     15 #include "clang/Frontend/FrontendActions.h"
     16 
     17 using namespace clang;
     18 
     19 ASTConsumer *ASTMergeAction::CreateASTConsumer(CompilerInstance &CI,
     20                                                StringRef InFile) {
     21   return AdaptedAction->CreateASTConsumer(CI, InFile);
     22 }
     23 
     24 bool 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 
     34 void ASTMergeAction::ExecuteAction() {
     35   CompilerInstance &CI = getCompilerInstance();
     36   CI.getDiagnostics().getClient()->BeginSourceFile(
     37                                              CI.getASTContext().getLangOpts());
     38   CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
     39                                        &CI.getASTContext());
     40   IntrusiveRefCntPtr<DiagnosticIDs>
     41       DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
     42   for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
     43     IntrusiveRefCntPtr<DiagnosticsEngine>
     44         Diags(new DiagnosticsEngine(DiagIDs, &CI.getDiagnosticOpts(),
     45                                     new ForwardingDiagnosticConsumer(
     46                                           *CI.getDiagnostics().getClient()),
     47                                     /*ShouldOwnClient=*/true));
     48     ASTUnit *Unit = ASTUnit::LoadFromASTFile(ASTFiles[I], Diags,
     49                                              CI.getFileSystemOpts(), false);
     50     if (!Unit)
     51       continue;
     52 
     53     ASTImporter Importer(CI.getASTContext(),
     54                          CI.getFileManager(),
     55                          Unit->getASTContext(),
     56                          Unit->getFileManager(),
     57                          /*MinimalImport=*/false);
     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 
     79 void ASTMergeAction::EndSourceFileAction() {
     80   return AdaptedAction->EndSourceFileAction();
     81 }
     82 
     83 ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
     84                                ArrayRef<std::string> ASTFiles)
     85   : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
     86   assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
     87 }
     88 
     89 ASTMergeAction::~ASTMergeAction() {
     90   delete AdaptedAction;
     91 }
     92 
     93 bool ASTMergeAction::usesPreprocessorOnly() const {
     94   return AdaptedAction->usesPreprocessorOnly();
     95 }
     96 
     97 TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
     98   return AdaptedAction->getTranslationUnitKind();
     99 }
    100 
    101 bool ASTMergeAction::hasPCHSupport() const {
    102   return AdaptedAction->hasPCHSupport();
    103 }
    104 
    105 bool ASTMergeAction::hasASTFileSupport() const {
    106   return AdaptedAction->hasASTFileSupport();
    107 }
    108 
    109 bool ASTMergeAction::hasCodeCompletionSupport() const {
    110   return AdaptedAction->hasCodeCompletionSupport();
    111 }
    112