MCAsmParser.h revision 2ee6c7ff80a5b2ff84d882c24db4bad35b948f91 
1//===-- llvm/MC/MCAsmParser.h - Abstract Asm Parser Interface ---*- 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_MCPARSER_MCASMPARSER_H
11#define LLVM_MC_MCPARSER_MCASMPARSER_H
12
13#include "llvm/ADT/ArrayRef.h"
14#include "llvm/ADT/StringRef.h"
15#include "llvm/MC/MCParser/AsmLexer.h"
16#include "llvm/Support/DataTypes.h"
17
18namespace llvm {
19class MCAsmInfo;
20class MCAsmLexer;
21class MCAsmParserExtension;
22class MCContext;
23class MCExpr;
24class MCInstPrinter;
25class MCInstrInfo;
26class MCStreamer;
27class MCTargetAsmParser;
28class SMLoc;
29class SMRange;
30class SourceMgr;
31class Twine;
32
33/// MCAsmParserSemaCallback - Generic Sema callback for assembly parser.
34class MCAsmParserSemaCallback {
35public:
36  typedef struct {
37    void *OpDecl;
38    bool IsVarDecl;
39    unsigned Length, Size, Type;
40
41    void clear() {
42      OpDecl = 0;
43      IsVarDecl = false;
44      Length = 1;
45      Size = 0;
46      Type = 0;
47    }
48  } InlineAsmIdentifierInfo;
49
50  virtual ~MCAsmParserSemaCallback();
51  virtual void *LookupInlineAsmIdentifier(StringRef &LineBuf,
52                                          InlineAsmIdentifierInfo &Info,
53                                          bool IsUnevaluatedContext) = 0;
54
55  virtual bool LookupInlineAsmField(StringRef Base, StringRef Member,
56                                    unsigned &Offset) = 0;
57};
58
59typedef MCAsmParserSemaCallback::InlineAsmIdentifierInfo
60  InlineAsmIdentifierInfo;
61
62/// MCAsmParser - Generic assembler parser interface, for use by target specific
63/// assembly parsers.
64class MCAsmParser {
65public:
66  typedef bool (*DirectiveHandler)(MCAsmParserExtension*, StringRef, SMLoc);
67  typedef std::pair<MCAsmParserExtension*, DirectiveHandler>
68    ExtensionDirectiveHandler;
69
70private:
71  MCAsmParser(const MCAsmParser &) LLVM_DELETED_FUNCTION;
72  void operator=(const MCAsmParser &) LLVM_DELETED_FUNCTION;
73
74  MCTargetAsmParser *TargetParser;
75
76  unsigned ShowParsedOperands : 1;
77
78protected: // Can only create subclasses.
79  MCAsmParser();
80
81public:
82  virtual ~MCAsmParser();
83
84  virtual void addDirectiveHandler(StringRef Directive,
85                                   ExtensionDirectiveHandler Handler) = 0;
86
87  virtual SourceMgr &getSourceManager() = 0;
88
89  virtual MCAsmLexer &getLexer() = 0;
90
91  virtual MCContext &getContext() = 0;
92
93  /// getStreamer - Return the output streamer for the assembler.
94  virtual MCStreamer &getStreamer() = 0;
95
96  MCTargetAsmParser &getTargetParser() const { return *TargetParser; }
97  void setTargetParser(MCTargetAsmParser &P);
98
99  virtual unsigned getAssemblerDialect() { return 0;}
100  virtual void setAssemblerDialect(unsigned i) { }
101
102  bool getShowParsedOperands() const { return ShowParsedOperands; }
103  void setShowParsedOperands(bool Value) { ShowParsedOperands = Value; }
104
105  /// Run - Run the parser on the input source buffer.
106  virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false) = 0;
107
108  virtual void setParsingInlineAsm(bool V) = 0;
109  virtual bool isParsingInlineAsm() = 0;
110
111  /// parseMSInlineAsm - Parse ms-style inline assembly.
112  virtual bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
113                                unsigned &NumOutputs, unsigned &NumInputs,
114                                SmallVectorImpl<std::pair<void *, bool> > &OpDecls,
115                                SmallVectorImpl<std::string> &Constraints,
116                                SmallVectorImpl<std::string> &Clobbers,
117                                const MCInstrInfo *MII,
118                                const MCInstPrinter *IP,
119                                MCAsmParserSemaCallback &SI) = 0;
120
121  /// Warning - Emit a warning at the location \p L, with the message \p Msg.
122  ///
123  /// \return The return value is true, if warnings are fatal.
124  virtual bool Warning(SMLoc L, const Twine &Msg,
125                       ArrayRef<SMRange> Ranges = None) = 0;
126
127  /// Error - Emit an error at the location \p L, with the message \p Msg.
128  ///
129  /// \return The return value is always true, as an idiomatic convenience to
130  /// clients.
131  virtual bool Error(SMLoc L, const Twine &Msg,
132                     ArrayRef<SMRange> Ranges = None) = 0;
133
134  /// Lex - Get the next AsmToken in the stream, possibly handling file
135  /// inclusion first.
136  virtual const AsmToken &Lex() = 0;
137
138  /// getTok - Get the current AsmToken from the stream.
139  const AsmToken &getTok();
140
141  /// \brief Report an error at the current lexer location.
142  bool TokError(const Twine &Msg, ArrayRef<SMRange> Ranges = None);
143
144  /// parseIdentifier - Parse an identifier or string (as a quoted identifier)
145  /// and set \p Res to the identifier contents.
146  virtual bool parseIdentifier(StringRef &Res) = 0;
147
148  /// \brief Parse up to the end of statement and return the contents from the
149  /// current token until the end of the statement; the current token on exit
150  /// will be either the EndOfStatement or EOF.
151  virtual StringRef parseStringToEndOfStatement() = 0;
152
153  /// parseEscapedString - Parse the current token as a string which may include
154  /// escaped characters and return the string contents.
155  virtual bool parseEscapedString(std::string &Data) = 0;
156
157  /// eatToEndOfStatement - Skip to the end of the current statement, for error
158  /// recovery.
159  virtual void eatToEndOfStatement() = 0;
160
161  /// parseExpression - Parse an arbitrary expression.
162  ///
163  /// @param Res - The value of the expression. The result is undefined
164  /// on error.
165  /// @result - False on success.
166  virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
167  bool parseExpression(const MCExpr *&Res);
168
169  /// parsePrimaryExpr - Parse a primary expression.
170  ///
171  /// @param Res - The value of the expression. The result is undefined
172  /// on error.
173  /// @result - False on success.
174  virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) = 0;
175
176  /// parseParenExpression - Parse an arbitrary expression, assuming that an
177  /// initial '(' has already been consumed.
178  ///
179  /// @param Res - The value of the expression. The result is undefined
180  /// on error.
181  /// @result - False on success.
182  virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
183
184  /// parseAbsoluteExpression - Parse an expression which must evaluate to an
185  /// absolute value.
186  ///
187  /// @param Res - The value of the absolute expression. The result is undefined
188  /// on error.
189  /// @result - False on success.
190  virtual bool parseAbsoluteExpression(int64_t &Res) = 0;
191
192  /// checkForValidSection - Ensure that we have a valid section set in the
193  /// streamer. Otherwise, report an error and switch to .text.
194  virtual void checkForValidSection() = 0;
195};
196
197/// \brief Create an MCAsmParser instance.
198MCAsmParser *createMCAsmParser(SourceMgr &, MCContext &,
199                               MCStreamer &, const MCAsmInfo &);
200
201} // End llvm namespace
202
203#endif
204