1//===-- llvm/MC/MCTargetAsmLexer.h - Target Assembly Lexer ------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef LLVM_MC_MCTARGETASMLEXER_H
11#define LLVM_MC_MCTARGETASMLEXER_H
12
13#include "llvm/MC/MCParser/MCAsmLexer.h"
14
15namespace llvm {
16class Target;
17
18/// MCTargetAsmLexer - Generic interface to target specific assembly lexers.
19class MCTargetAsmLexer {
20  /// The current token
21  AsmToken CurTok;
22
23  /// The location and description of the current error
24  SMLoc ErrLoc;
25  std::string Err;
26
27  MCTargetAsmLexer(const MCTargetAsmLexer &);   // DO NOT IMPLEMENT
28  void operator=(const MCTargetAsmLexer &);  // DO NOT IMPLEMENT
29protected: // Can only create subclasses.
30  MCTargetAsmLexer(const Target &);
31
32  virtual AsmToken LexToken() = 0;
33
34  void SetError(const SMLoc &errLoc, const std::string &err) {
35    ErrLoc = errLoc;
36    Err = err;
37  }
38
39  /// TheTarget - The Target that this machine was created for.
40  const Target &TheTarget;
41  MCAsmLexer *Lexer;
42
43public:
44  virtual ~MCTargetAsmLexer();
45
46  const Target &getTarget() const { return TheTarget; }
47
48  /// InstallLexer - Set the lexer to get tokens from lower-level lexer \arg L.
49  void InstallLexer(MCAsmLexer &L) {
50    Lexer = &L;
51  }
52
53  MCAsmLexer *getLexer() {
54    return Lexer;
55  }
56
57  /// Lex - Consume the next token from the input stream and return it.
58  const AsmToken &Lex() {
59    return CurTok = LexToken();
60  }
61
62  /// getTok - Get the current (last) lexed token.
63  const AsmToken &getTok() {
64    return CurTok;
65  }
66
67  /// getErrLoc - Get the current error location
68  const SMLoc &getErrLoc() {
69    return ErrLoc;
70  }
71
72  /// getErr - Get the current error string
73  const std::string &getErr() {
74    return Err;
75  }
76
77  /// getKind - Get the kind of current token.
78  AsmToken::TokenKind getKind() const { return CurTok.getKind(); }
79
80  /// is - Check if the current token has kind \arg K.
81  bool is(AsmToken::TokenKind K) const { return CurTok.is(K); }
82
83  /// isNot - Check if the current token has kind \arg K.
84  bool isNot(AsmToken::TokenKind K) const { return CurTok.isNot(K); }
85};
86
87} // End llvm namespace
88
89#endif
90