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