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142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
//===-- llvm/MC/MCAsmLexer.h - Abstract Asm Lexer Interface -----*- 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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#ifndef LLVM_MC_MCASMLEXER_H
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#define LLVM_MC_MCASMLEXER_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/System/DataTypes.h"
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namespace llvm {
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class MCAsmLexer;
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class MCInst;
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class SMLoc;
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class Target;
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/// AsmToken - Target independent representation for an assembler token.
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struct AsmToken {
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enum TokenKind {
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// Markers
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Eof, Error,
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// String values.
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Identifier,
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String,
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// Integer values.
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Integer,
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// No-value.
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EndOfStatement,
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Colon,
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Plus, Minus, Tilde,
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Slash, // '/'
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LParen, RParen, LBrac, RBrac, LCurly, RCurly,
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Star, Comma, Dollar, Equal, EqualEqual,
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Pipe, PipePipe, Caret,
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Amp, AmpAmp, Exclaim, ExclaimEqual, Percent, Hash,
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Less, LessEqual, LessLess, LessGreater,
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Greater, GreaterEqual, GreaterGreater
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};
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TokenKind Kind;
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/// A reference to the entire token contents; this is always a pointer into
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/// a memory buffer owned by the source manager.
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StringRef Str;
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int64_t IntVal;
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public:
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AsmToken() {}
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AsmToken(TokenKind _Kind, StringRef _Str, int64_t _IntVal = 0)
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: Kind(_Kind), Str(_Str), IntVal(_IntVal) {}
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TokenKind getKind() const { return Kind; }
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bool is(TokenKind K) const { return Kind == K; }
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bool isNot(TokenKind K) const { return Kind != K; }
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SMLoc getLoc() const;
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/// getStringContents - Get the contents of a string token (without quotes).
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StringRef getStringContents() const {
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assert(Kind == String && "This token isn't a string!");
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return Str.slice(1, Str.size() - 1);
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}
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/// getIdentifier - Get the identifier string for the current token, which
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/// should be an identifier or a string. This gets the portion of the string
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/// which should be used as the identifier, e.g., it does not include the
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/// quotes on strings.
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StringRef getIdentifier() const {
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if (Kind == Identifier)
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return getString();
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return getStringContents();
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}
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/// getString - Get the string for the current token, this includes all
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/// characters (for example, the quotes on strings) in the token.
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///
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/// The returned StringRef points into the source manager's memory buffer, and
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/// is safe to store across calls to Lex().
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StringRef getString() const { return Str; }
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// FIXME: Don't compute this in advance, it makes every token larger, and is
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// also not generally what we want (it is nicer for recovery etc. to lex 123br
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// as a single token, then diagnose as an invalid number).
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int64_t getIntVal() const {
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assert(Kind == Integer && "This token isn't an integer!");
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return IntVal;
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}
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};
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/// MCAsmLexer - Generic assembler lexer interface, for use by target specific
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/// assembly lexers.
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class MCAsmLexer {
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/// The current token, stored in the base class for faster access.
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AsmToken CurTok;
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MCAsmLexer(const MCAsmLexer &); // DO NOT IMPLEMENT
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void operator=(const MCAsmLexer &); // DO NOT IMPLEMENT
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protected: // Can only create subclasses.
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MCAsmLexer();
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virtual AsmToken LexToken() = 0;
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public:
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virtual ~MCAsmLexer();
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/// Lex - Consume the next token from the input stream and return it.
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///
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/// The lexer will continuosly return the end-of-file token once the end of
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/// the main input file has been reached.
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const AsmToken &Lex() {
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return CurTok = LexToken();
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}
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/// getTok - Get the current (last) lexed token.
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const AsmToken &getTok() {
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return CurTok;
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}
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/// getKind - Get the kind of current token.
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AsmToken::TokenKind getKind() const { return CurTok.getKind(); }
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/// is - Check if the current token has kind \arg K.
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bool is(AsmToken::TokenKind K) const { return CurTok.is(K); }
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/// isNot - Check if the current token has kind \arg K.
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bool isNot(AsmToken::TokenKind K) const { return CurTok.isNot(K); }
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};
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} // End llvm namespace
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#endif
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