1 //===- ExternalPreprocessorSource.h - Abstract Macro Interface --*- 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 // 10 // This file defines the ExternalPreprocessorSource interface, which enables 11 // construction of macro definitions from some external source. 12 // 13 //===----------------------------------------------------------------------===// 14 #ifndef LLVM_CLANG_LEX_EXTERNALPREPROCESSORSOURCE_H 15 #define LLVM_CLANG_LEX_EXTERNALPREPROCESSORSOURCE_H 16 17 namespace clang { 18 19 class IdentifierInfo; 20 21 /// \brief 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 macro definitions. 26 class ExternalPreprocessorSource { 27 public: 28 virtual ~ExternalPreprocessorSource(); 29 30 /// \brief Read the set of macros defined by this external macro source. 31 virtual void ReadDefinedMacros() = 0; 32 33 /// \brief Update an out-of-date identifier. 34 virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0; 35 }; 36 37 } 38 39 #endif 40