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 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33   /// \brief Update an out-of-date identifier.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 // LLVM_CLANG_LEX_EXTERNAL_PREPROCESSOR_SOURCE_H
40