xref: /external/clang/include/clang/Sema/ExternalSemaSource.h

//===--- ExternalSemaSource.h - External Sema Interface ---------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines the ExternalSemaSource interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_SEMA_EXTERNAL_SEMA_SOURCE_H
#define LLVM_CLANG_SEMA_EXTERNAL_SEMA_SOURCE_H

#include "clang/AST/ExternalASTSource.h"
#include <utility>

namespace clang {

class DeclaratorDecl;
class LookupResult;
struct ObjCMethodList;
class Scope;
class Sema;
class VarDecl;

/// \brief An abstract interface that should be implemented by
/// external AST sources that also provide information for semantic
/// analysis.
class ExternalSemaSource : public ExternalASTSource {
public:
  ExternalSemaSource() {
    ExternalASTSource::SemaSource = true;
  }

  ~ExternalSemaSource();

  /// \brief Initialize the semantic source with the Sema instance
  /// being used to perform semantic analysis on the abstract syntax
  /// tree.
  virtual void InitializeSema(Sema &S) {}

  /// \brief Inform the semantic consumer that Sema is no longer available.
  virtual void ForgetSema() {}

  /// \brief Load the contents of the global method pool for a given
  /// selector.
  ///
  /// \returns a pair of Objective-C methods lists containing the
  /// instance and factory methods, respectively, with this selector.
  virtual std::pair<ObjCMethodList,ObjCMethodList> ReadMethodPool(Selector Sel);

  /// \brief Load the set of namespaces that are known to the external source,
  /// which will be used during typo correction.
  virtual void ReadKnownNamespaces(
                           SmallVectorImpl<NamespaceDecl *> &Namespaces);

  /// \brief Do last resort, unqualified lookup on a LookupResult that
  /// Sema cannot find.
  ///
  /// \param R a LookupResult that is being recovered.
  ///
  /// \param S the Scope of the identifier occurrence.
  ///
  /// \return true to tell Sema to recover using the LookupResult.
  virtual bool LookupUnqualified(LookupResult &R, Scope *S) { return false; }

  /// \brief Read the set of tentative definitions known to the external Sema
  /// source.
  ///
  /// The external source should append its own tentative definitions to the
  /// given vector of tentative definitions. Note that this routine may be
  /// invoked multiple times; the external source should take care not to
  /// introduce the same declarations repeatedly.
  virtual void ReadTentativeDefinitions(
                                  SmallVectorImpl<VarDecl *> &TentativeDefs) {}

  /// \brief Read the set of unused file-scope declarations known to the
  /// external Sema source.
  ///
  /// The external source should append its own unused, filed-scope to the
  /// given vector of declarations. Note that this routine may be
  /// invoked multiple times; the external source should take care not to
  /// introduce the same declarations repeatedly.
  virtual void ReadUnusedFileScopedDecls(
                 SmallVectorImpl<const DeclaratorDecl *> &Decls) {}


  // isa/cast/dyn_cast support
  static bool classof(const ExternalASTSource *Source) {
    return Source->SemaSource;
  }
  static bool classof(const ExternalSemaSource *) { return true; }
};

} // end namespace clang

#endif