C++ TranslationUnitDecl::addDecl方法代码示例

//.........这里部分代码省略.........
  if (Path.size() > 1) {
    for (unsigned I = 1, N = Path.size(); I != N; ++I) {
      StringRef Name = Path[I].first->getName();
      clang::Module *Sub = Module->findSubmodule(Name);
      
      if (!Sub) {
        // Attempt to perform typo correction to find a module name that works.
        llvm::SmallVector<StringRef, 2> Best;
        unsigned BestEditDistance = (std::numeric_limits<unsigned>::max)();
        
        for (clang::Module::submodule_iterator J = Module->submodule_begin(), 
                                            JEnd = Module->submodule_end();
             J != JEnd; ++J) {
          unsigned ED = Name.edit_distance((*J)->Name,
                                           /*AllowReplacements=*/true,
                                           BestEditDistance);
          if (ED <= BestEditDistance) {
            if (ED < BestEditDistance) {
              Best.clear();
              BestEditDistance = ED;
            }
            
            Best.push_back((*J)->Name);
          }
        }
        
        // If there was a clear winner, user it.
        if (Best.size() == 1) {
          getDiagnostics().Report(Path[I].second, 
                                  diag::err_no_submodule_suggest)
            << Path[I].first << Module->getFullModuleName() << Best[0]
            << SourceRange(Path[0].second, Path[I-1].second)
            << FixItHint::CreateReplacement(SourceRange(Path[I].second),
                                            Best[0]);
          
          Sub = Module->findSubmodule(Best[0]);
        }
      }
      
      if (!Sub) {
        // No submodule by this name. Complain, and don't look for further
        // submodules.
        getDiagnostics().Report(Path[I].second, diag::err_no_submodule)
          << Path[I].first << Module->getFullModuleName()
          << SourceRange(Path[0].second, Path[I-1].second);
        break;
      }
      
      Module = Sub;
    }
  }
  
  // Make the named module visible, if it's not already part of the module
  // we are parsing.
  if (ModuleName != getLangOpts().CurrentModule) {
    if (!Module->IsFromModuleFile) {
      // We have an umbrella header or directory that doesn't actually include
      // all of the headers within the directory it covers. Complain about
      // this missing submodule and recover by forgetting that we ever saw
      // this submodule.
      // FIXME: Should we detect this at module load time? It seems fairly
      // expensive (and rare).
      getDiagnostics().Report(ImportLoc, diag::warn_missing_submodule)
        << Module->getFullModuleName()
        << SourceRange(Path.front().second, Path.back().second);
      
      return ModuleLoadResult(0, true);
    }

    // Check whether this module is available.
    StringRef Feature;
    if (!Module->isAvailable(getLangOpts(), getTarget(), Feature)) {
      getDiagnostics().Report(ImportLoc, diag::err_module_unavailable)
        << Module->getFullModuleName()
        << Feature
        << SourceRange(Path.front().second, Path.back().second);
      LastModuleImportLoc = ImportLoc;
      LastModuleImportResult = ModuleLoadResult();
      return ModuleLoadResult();
    }

    ModuleManager->makeModuleVisible(Module, Visibility);
  }
  
  // If this module import was due to an inclusion directive, create an 
  // implicit import declaration to capture it in the AST.
  if (IsInclusionDirective && hasASTContext()) {
    TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
    ImportDecl *ImportD = ImportDecl::CreateImplicit(getASTContext(), TU,
                                                     ImportLoc, Module,
                                                     Path.back().second);
    TU->addDecl(ImportD);
    if (Consumer)
      Consumer->HandleImplicitImportDecl(ImportD);
  }
  
  LastModuleImportLoc = ImportLoc;
  LastModuleImportResult = ModuleLoadResult(Module, false);
  return LastModuleImportResult;
}