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//===- TGLexer.h - Lexer for TableGen Files ---------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class represents the Lexer for tablegen files.
//
//===----------------------------------------------------------------------===//
#ifndef TGLEXER_H
#define TGLEXER_H
#include <vector>
#include <string>
#include <iosfwd>
namespace llvm {
class MemoryBuffer;
class TGLexer {
const char *CurPtr;
unsigned CurLineNo;
MemoryBuffer *CurBuf;
/// IncludeRec / IncludeStack - This captures the current set of include
/// directives we are nested within.
struct IncludeRec {
MemoryBuffer *Buffer;
const char *CurPtr;
unsigned LineNo;
IncludeRec(MemoryBuffer *buffer, const char *curPtr, unsigned lineNo)
: Buffer(buffer), CurPtr(curPtr), LineNo(lineNo) {}
};
std::vector<IncludeRec> IncludeStack;
// IncludeDirectories - This is the list of directories we should search for
// include files in.
std::vector<std::string> IncludeDirectories;
public:
TGLexer(MemoryBuffer *StartBuf);
~TGLexer();
void setIncludeDirs(const std::vector<std::string> &Dirs) {
IncludeDirectories = Dirs;
}
int LexToken();
void PrintError(const char *Loc, const std::string &Msg) const;
std::ostream &err() const;
void PrintIncludeStack(std::ostream &OS) const;
private:
int ReturnError(const char *Loc, const std::string &Msg);
int getNextChar();
void SkipBCPLComment();
bool SkipCComment();
int LexIdentifier();
bool LexInclude();
int LexString();
int LexVarName();
int LexNumber();
int LexBracket();
int LexExclaim();
};
} // end namespace llvm
#endif
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