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  1. //===--- ScratchBuffer.h - Scratch space for forming tokens -----*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. //  This file defines the ScratchBuffer interface.
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef LLVM_CLANG_LEX_SCRATCHBUFFER_H
  14. #define LLVM_CLANG_LEX_SCRATCHBUFFER_H
  15.  
  16. #include "clang/Basic/SourceLocation.h"
  17.  
  18. namespace clang {
  19.   class SourceManager;
  20.  
  21. /// ScratchBuffer - This class exposes a simple interface for the dynamic
  22. /// construction of tokens.  This is used for builtin macros (e.g. __LINE__) as
  23. /// well as token pasting, etc.
  24. class ScratchBuffer {
  25.   SourceManager &SourceMgr;
  26.   char *CurBuffer;
  27.   SourceLocation BufferStartLoc;
  28.   unsigned BytesUsed;
  29. public:
  30.   ScratchBuffer(SourceManager &SM);
  31.  
  32.   /// getToken - Splat the specified text into a temporary MemoryBuffer and
  33.   /// return a SourceLocation that refers to the token.  This is just like the
  34.   /// previous method, but returns a location that indicates the physloc of the
  35.   /// token.
  36.   SourceLocation getToken(const char *Buf, unsigned Len, const char *&DestPtr);
  37.  
  38. private:
  39.   void AllocScratchBuffer(unsigned RequestLen);
  40. };
  41.  
  42. } // end namespace clang
  43.  
  44. #endif
  45.