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  1. //===- ExternalPreprocessorSource.h - Abstract Macro Interface --*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. //  This file defines the ExternalPreprocessorSource interface, which enables
  10. //  construction of macro definitions from some external source.
  11. //
  12. //===----------------------------------------------------------------------===//
  13. #ifndef LLVM_CLANG_LEX_EXTERNALPREPROCESSORSOURCE_H
  14. #define LLVM_CLANG_LEX_EXTERNALPREPROCESSORSOURCE_H
  15.  
  16. namespace clang {
  17.  
  18. class IdentifierInfo;
  19. class Module;
  20.  
  21. /// Abstract interface for external sources of preprocessor
  22. /// information.
  23. ///
  24. /// This abstract class allows an external sources (such as the \c ASTReader)
  25. /// to provide additional preprocessing information.
  26. class ExternalPreprocessorSource {
  27. public:
  28.   virtual ~ExternalPreprocessorSource();
  29.  
  30.   /// Read the set of macros defined by this external macro source.
  31.   virtual void ReadDefinedMacros() = 0;
  32.  
  33.   /// Update an out-of-date identifier.
  34.   virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0;
  35.  
  36.   /// Return the identifier associated with the given ID number.
  37.   ///
  38.   /// The ID 0 is associated with the NULL identifier.
  39.   virtual IdentifierInfo *GetIdentifier(unsigned ID) = 0;
  40.  
  41.   /// Map a module ID to a module.
  42.   virtual Module *getModule(unsigned ModuleID) = 0;
  43. };
  44.  
  45. }
  46.  
  47. #endif
  48.