LLVM  3.7.0
AsmLexer.h
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1 //===- AsmLexer.h - Lexer for Assembly Files --------------------*- 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 // This class declares the lexer for assembly files.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_MC_MCPARSER_ASMLEXER_H
15 #define LLVM_MC_MCPARSER_ASMLEXER_H
16 
17 #include "llvm/ADT/StringRef.h"
19 #include "llvm/Support/DataTypes.h"
20 #include <string>
21 
22 namespace llvm {
23 class MemoryBuffer;
24 class MCAsmInfo;
25 
26 /// AsmLexer - Lexer class for assembly files.
27 class AsmLexer : public MCAsmLexer {
28  const MCAsmInfo &MAI;
29 
30  const char *CurPtr;
31  StringRef CurBuf;
32  bool isAtStartOfLine;
33 
34  void operator=(const AsmLexer&) = delete;
35  AsmLexer(const AsmLexer&) = delete;
36 
37 protected:
38  /// LexToken - Read the next token and return its code.
39  AsmToken LexToken() override;
40 
41 public:
42  AsmLexer(const MCAsmInfo &MAI);
43  ~AsmLexer() override;
44 
45  void setBuffer(StringRef Buf, const char *ptr = nullptr);
46 
49 
50  const AsmToken peekTok(bool ShouldSkipSpace = true) override;
51 
52  bool isAtStartOfComment(const char *Ptr);
53  bool isAtStatementSeparator(const char *Ptr);
54 
55  const MCAsmInfo &getMAI() const { return MAI; }
56 
57 private:
58  int getNextChar();
59  AsmToken ReturnError(const char *Loc, const std::string &Msg);
60 
61  AsmToken LexIdentifier();
62  AsmToken LexSlash();
63  AsmToken LexLineComment();
64  AsmToken LexDigit();
65  AsmToken LexSingleQuote();
66  AsmToken LexQuote();
67  AsmToken LexFloatLiteral();
68  AsmToken LexHexFloatLiteral(bool NoIntDigits);
69 };
70 
71 } // end namespace llvm
72 
73 #endif
const AsmToken peekTok(bool ShouldSkipSpace=true) override
Look ahead at the next token to be lexed.
Definition: AsmLexer.cpp:439
AsmLexer - Lexer class for assembly files.
Definition: AsmLexer.h:27
void setBuffer(StringRef Buf, const char *ptr=nullptr)
Definition: AsmLexer.cpp:33
Generic assembler lexer interface, for use by target specific assembly lexers.
Definition: MCAsmLexer.h:119
Target independent representation for an assembler token.
Definition: MCAsmLexer.h:22
StringRef LexUntilEndOfLine()
Definition: AsmLexer.cpp:429
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:58
bool isAtStatementSeparator(const char *Ptr)
Definition: AsmLexer.cpp:474
bool isAtStartOfComment(const char *Ptr)
Definition: AsmLexer.cpp:461
StringRef LexUntilEndOfStatement() override
Definition: AsmLexer.cpp:417
~AsmLexer() override
Definition: AsmLexer.cpp:30
AsmToken LexToken() override
LexToken - Read the next token and return its code.
Definition: AsmLexer.cpp:479
const MCAsmInfo & getMAI() const
Definition: AsmLexer.h:55
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40