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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 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     for (auto *D : TU->decls()) {
     63       // Don't re-import __va_list_tag, __builtin_va_list.
     64       if (const auto *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       Decl *ToD = Importer.Import(D);
     70 
     71       if (ToD) {
     72         DeclGroupRef DGR(ToD);
     73         CI.getASTConsumer().HandleTopLevelDecl(DGR);
     74       }
     75     }
     76   }
     77 
     78   AdaptedAction->ExecuteAction();
     79   CI.getDiagnostics().getClient()->EndSourceFile();
     80 }
     81 
     82 void ASTMergeAction::EndSourceFileAction() {
     83   return AdaptedAction->EndSourceFileAction();
     84 }
     85 
     86 ASTMergeAction::ASTMergeAction(std::unique_ptr<FrontendAction> adaptedAction,
     87                                ArrayRef<std::string> ASTFiles)
     88 : AdaptedAction(std::move(adaptedAction)), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
     89   assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
     90 }
     91 
     92 ASTMergeAction::~ASTMergeAction() {
     93 }
     94 
     95 bool ASTMergeAction::usesPreprocessorOnly() const {
     96   return AdaptedAction->usesPreprocessorOnly();
     97 }
     98 
     99 TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
    100   return AdaptedAction->getTranslationUnitKind();
    101 }
    102 
    103 bool ASTMergeAction::hasPCHSupport() const {
    104   return AdaptedAction->hasPCHSupport();
    105 }
    106 
    107 bool ASTMergeAction::hasASTFileSupport() const {
    108   return AdaptedAction->hasASTFileSupport();
    109 }
    110 
    111 bool ASTMergeAction::hasCodeCompletionSupport() const {
    112   return AdaptedAction->hasCodeCompletionSupport();
    113 }
    114