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//===- TGLexer.h - Lexer for TableGen Files ---------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 "llvm/Support/DataTypes.h"
#include <string>
#include <vector>
#include <cassert>
namespace llvm {
class MemoryBuffer;
class SourceMgr;
class SMLoc;
class Twine;
namespace tgtok {
enum TokKind {
// Markers
Eof, Error,
// Tokens with no info.
minus, plus, // - +
l_square, r_square, // [ ]
l_brace, r_brace, // { }
l_paren, r_paren, // ( )
less, greater, // < >
colon, semi, // : ;
comma, period, // , .
equal, question, // = ?
paste, // #
// Keywords.
Bit, Bits, Class, Code, Dag, Def, Foreach, Defm, Field, In, Int, Let, List,
MultiClass, String,
// !keywords.
XConcat, XSRA, XSRL, XSHL, XStrConcat, XCast, XSubst,
XForEach, XHead, XTail, XEmpty, XIf, XEq,
// Integer value.
IntVal,
// String valued tokens.
Id, StrVal, VarName, CodeFragment
};
}
/// TGLexer - TableGen Lexer class.
class TGLexer {
SourceMgr &SrcMgr;
const char *CurPtr;
const MemoryBuffer *CurBuf;
// Information about the current token.
const char *TokStart;
tgtok::TokKind CurCode;
std::string CurStrVal; // This is valid for ID, STRVAL, VARNAME, CODEFRAGMENT
int64_t CurIntVal; // This is valid for INTVAL.
/// CurBuffer - This is the current buffer index we're lexing from as managed
/// by the SourceMgr object.
int CurBuffer;
/// Dependencies - This is the list of all included files.
std::vector<std::string> Dependencies;
public:
TGLexer(SourceMgr &SrcMgr);
~TGLexer() {}
tgtok::TokKind Lex() {
return CurCode = LexToken();
}
const std::vector<std::string> &getDependencies() const {
return Dependencies;
}
tgtok::TokKind getCode() const { return CurCode; }
const std::string &getCurStrVal() const {
assert((CurCode == tgtok::Id || CurCode == tgtok::StrVal ||
CurCode == tgtok::VarName || CurCode == tgtok::CodeFragment) &&
"This token doesn't have a string value");
return CurStrVal;
}
int64_t getCurIntVal() const {
assert(CurCode == tgtok::IntVal && "This token isn't an integer");
return CurIntVal;
}
SMLoc getLoc() const;
private:
/// LexToken - Read the next token and return its code.
tgtok::TokKind LexToken();
tgtok::TokKind ReturnError(const char *Loc, const Twine &Msg);
int getNextChar();
int peekNextChar(int Index);
void SkipBCPLComment();
bool SkipCComment();
tgtok::TokKind LexIdentifier();
bool LexInclude();
tgtok::TokKind LexString();
tgtok::TokKind LexVarName();
tgtok::TokKind LexNumber();
tgtok::TokKind LexBracket();
tgtok::TokKind LexExclaim();
};
} // end namespace llvm
#endif
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