Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- LLLexer.h - Lexer for LLVM Assembly Files ----------------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This class represents the Lexer for .ll files.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_ASMPARSER_LLLEXER_H

#define LLVM_ASMPARSER_LLLEXER_H

#include "LLToken.h"

#include "llvm/ADT/APFloat.h"

#include "llvm/ADT/APSInt.h"

#include "llvm/Support/SMLoc.h"

#include <string>

namespace llvm {

  class Type;

  class SMDiagnostic;

  class SourceMgr;

  class LLVMContext;

  class LLLexer {

    const char *CurPtr;

    StringRef CurBuf;

    SMDiagnostic &ErrorInfo;

    SourceMgr &SM;

    LLVMContext &Context;

    // Information about the current token.

    const char *TokStart;

    lltok::Kind CurKind;

    std::string StrVal;

    unsigned UIntVal;

    Type *TyVal = nullptr;

    APFloat APFloatVal;

    APSInt  APSIntVal;

    // When false (default), an identifier ending in ':' is a label token.

    // When true, the ':' is treated as a separate token.

    bool IgnoreColonInIdentifiers;

  public:

    explicit LLLexer(StringRef StartBuf, SourceMgr &SM, SMDiagnostic &,

                     LLVMContext &C);

    lltok::Kind Lex() {

      return CurKind = LexToken();

    }

    typedef SMLoc LocTy;

    LocTy getLoc() const { return SMLoc::getFromPointer(TokStart); }

    lltok::Kind getKind() const { return CurKind; }

    const std::string &getStrVal() const { return StrVal; }

    Type *getTyVal() const { return TyVal; }

    unsigned getUIntVal() const { return UIntVal; }

    const APSInt &getAPSIntVal() const { return APSIntVal; }

    const APFloat &getAPFloatVal() const { return APFloatVal; }

    void setIgnoreColonInIdentifiers(bool val) {

      IgnoreColonInIdentifiers = val;

    }

    bool Error(LocTy ErrorLoc, const Twine &Msg) const;

    bool Error(const Twine &Msg) const { return Error(getLoc(), Msg); }

    void Warning(LocTy WarningLoc, const Twine &Msg) const;

    void Warning(const Twine &Msg) const { return Warning(getLoc(), Msg); }

  private:

    lltok::Kind LexToken();

    int getNextChar();

    void SkipLineComment();

    lltok::Kind ReadString(lltok::Kind kind);

    bool ReadVarName();

    lltok::Kind LexIdentifier();

    lltok::Kind LexDigitOrNegative();

    lltok::Kind LexPositive();

    lltok::Kind LexAt();

    lltok::Kind LexDollar();

    lltok::Kind LexExclaim();

    lltok::Kind LexPercent();

    lltok::Kind LexUIntID(lltok::Kind Token);

    lltok::Kind LexVar(lltok::Kind Var, lltok::Kind VarID);

    lltok::Kind LexQuote();

    lltok::Kind Lex0x();

    lltok::Kind LexHash();

    lltok::Kind LexCaret();

    uint64_t atoull(const char *Buffer, const char *End);

    uint64_t HexIntToVal(const char *Buffer, const char *End);

    void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);

    void FP80HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);

  };

} // end namespace llvm

#endif