contrib/llvm/tools/clang/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/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 std::unique_ptr<ASTConsumer>
  20 ASTMergeAction::CreateASTConsumer(CompilerInstance &CI, 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     std::unique_ptr<ASTUnit> Unit =
  49         ASTUnit::LoadFromASTFile(ASTFiles[I], CI.getPCHContainerReader(),
  50                                  Diags, CI.getFileSystemOpts(), false);
  51
  52     if (!Unit)
  53       continue;
  54
  55     ASTImporter Importer(CI.getASTContext(),
  56                          CI.getFileManager(),
  57                          Unit->getASTContext(),
  58                          Unit->getFileManager(),
  59                          /*MinimalImport=*/false);
  60
  61     TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
  62     CI.getASTConsumer().Initialize(CI.getASTContext());
  63     for (auto *D : TU->decls()) {
  64       // Don't re-import __va_list_tag, __builtin_va_list.
  65       if (const auto *ND = dyn_cast<NamedDecl>(D))
  66         if (IdentifierInfo *II = ND->getIdentifier())
  67           if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
  68             continue;
  69
  70       Decl *ToD = Importer.Import(D);
  71
  72       if (ToD) {
  73         DeclGroupRef DGR(ToD);
  74         CI.getASTConsumer().HandleTopLevelDecl(DGR);
  75       }
  76     }
  77   }
  78
  79   AdaptedAction->ExecuteAction();
  80   CI.getDiagnostics().getClient()->EndSourceFile();
  81 }
  82
  83 void ASTMergeAction::EndSourceFileAction() {
  84   return AdaptedAction->EndSourceFileAction();
  85 }
  86
  87 ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
  88                                ArrayRef<std::string> ASTFiles)
  89   : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
  90   assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
  91 }
  92
  93 ASTMergeAction::~ASTMergeAction() {
  94   delete AdaptedAction;
  95 }
  96
  97 bool ASTMergeAction::usesPreprocessorOnly() const {
  98   return AdaptedAction->usesPreprocessorOnly();
  99 }
 100
 101 TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
 102   return AdaptedAction->getTranslationUnitKind();
 103 }
 104
 105 bool ASTMergeAction::hasPCHSupport() const {
 106   return AdaptedAction->hasPCHSupport();
 107 }
 108
 109 bool ASTMergeAction::hasASTFileSupport() const {
 110   return AdaptedAction->hasASTFileSupport();
 111 }
 112
 113 bool ASTMergeAction::hasCodeCompletionSupport() const {
 114   return AdaptedAction->hasCodeCompletionSupport();
 115 }