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_EXTERNAL_PREPROCESSOR_SOURCE_H 15 #define LLVM_CLANG_LEX_EXTERNAL_PREPROCESSOR_SOURCE_H 16 17 namespace clang { 18 19 /// \brief Abstract interface for external sources of preprocessor 20 /// information. 21 /// 22 /// This abstract class allows an external sources (such as the \c ASTReader) 23 /// to provide additional macro definitions. 24 class ExternalPreprocessorSource { 25 public: 26 virtual ~ExternalPreprocessorSource(); 27 28 /// \brief Read the set of macros defined by this external macro source. 29 virtual void ReadDefinedMacros() = 0; 30 31 /// \brief Read the definition for the given macro. 32 virtual void LoadMacroDefinition(IdentifierInfo *II) = 0; 33 34 /// \brief Update an out-of-date identifier. 35 virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0; 36 }; 37 38 } 39 40 #endif // LLVM_CLANG_LEX_EXTERNAL_PREPROCESSOR_SOURCE_H 41