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
17namespace clang {
18
19class 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.
26class ExternalPreprocessorSource {
27public:
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33  /// \brief Update an out-of-date identifier.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