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 class Module; 21 22 /// \brief Abstract interface for external sources of preprocessor 23 /// information. 24 /// 25 /// This abstract class allows an external sources (such as the \c ASTReader) 26 /// to provide additional preprocessing information. 27 class ExternalPreprocessorSource { 28 public: 29 virtual ~ExternalPreprocessorSource(); 30 31 /// \brief Read the set of macros defined by this external macro source. 32 virtual void ReadDefinedMacros() = 0; 33 34 /// \brief Update an out-of-date identifier. 35 virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0; 36 37 /// \brief Return the identifier associated with the given ID number. 38 /// 39 /// The ID 0 is associated with the NULL identifier. 40 virtual IdentifierInfo *GetIdentifier(unsigned ID) = 0; 41 42 /// \brief Map a module ID to a module. 43 virtual Module *getModule(unsigned ModuleID) = 0; 44 }; 45 46 } 47 48 #endif 49