1 //===--- ScratchBuffer.h - Scratch space for forming tokens -----*- 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 ScratchBuffer interface. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_SCRATCHBUFFER_H 15 #define LLVM_CLANG_SCRATCHBUFFER_H 16 17 #include "clang/Basic/SourceLocation.h" 18 19 namespace clang { 20 class SourceManager; 21 22 /// ScratchBuffer - This class exposes a simple interface for the dynamic 23 /// construction of tokens. This is used for builtin macros (e.g. __LINE__) as 24 /// well as token pasting, etc. 25 class ScratchBuffer { 26 SourceManager &SourceMgr; 27 char *CurBuffer; 28 SourceLocation BufferStartLoc; 29 unsigned BytesUsed; 30 public: 31 ScratchBuffer(SourceManager &SM); 32 33 /// getToken - Splat the specified text into a temporary MemoryBuffer and 34 /// return a SourceLocation that refers to the token. This is just like the 35 /// previous method, but returns a location that indicates the physloc of the 36 /// token. 37 SourceLocation getToken(const char *Buf, unsigned Len, const char *&DestPtr); 38 39 private: 40 void AllocScratchBuffer(unsigned RequestLen); 41 }; 42 43 } // end namespace clang 44 45 #endif 46
