1 //===-- llvm/MC/MCTargetAsmParser.h - Target Assembly Parser ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_TARGETPARSER_H
11 #define LLVM_MC_TARGETPARSER_H
13 #include "llvm/MC/MCParser/MCAsmParserExtension.h"
20 class MCParsedAsmOperand;
22 template <typename T> class SmallVectorImpl;
25 AOK_Align, // Rewrite align as .align.
26 AOK_DotOperator, // Rewrite a dot operator expression as an immediate.
27 // E.g., [eax].foo.bar -> [eax].8
28 AOK_Emit, // Rewrite _emit as .byte.
29 AOK_Imm, // Rewrite as $$N.
30 AOK_ImmPrefix, // Add $$ before a parsed Imm.
31 AOK_Input, // Rewrite in terms of $N.
32 AOK_Output, // Rewrite in terms of $N.
33 AOK_SizeDirective, // Add a sizing directive (e.g., dword ptr).
34 AOK_Skip // Skip emission (e.g., offset/type operators).
43 AsmRewrite(AsmRewriteKind kind, SMLoc loc, unsigned len = 0, unsigned val = 0)
44 : Kind(kind), Loc(loc), Len(len), Val(val) {}
47 struct ParseInstructionInfo {
49 SmallVectorImpl<AsmRewrite> *AsmRewrites;
51 ParseInstructionInfo() : AsmRewrites(0) {}
52 ParseInstructionInfo(SmallVectorImpl<AsmRewrite> *rewrites)
53 : AsmRewrites(rewrites) {}
55 ~ParseInstructionInfo() {}
58 /// MCTargetAsmParser - Generic interface to target specific assembly parsers.
59 class MCTargetAsmParser : public MCAsmParserExtension {
66 FIRST_TARGET_MATCH_RESULT_TY
70 MCTargetAsmParser(const MCTargetAsmParser &) LLVM_DELETED_FUNCTION;
71 void operator=(const MCTargetAsmParser &) LLVM_DELETED_FUNCTION;
72 protected: // Can only create subclasses.
75 /// AvailableFeatures - The current set of available features.
76 unsigned AvailableFeatures;
78 /// ParsingInlineAsm - Are we parsing ms-style inline assembly?
79 bool ParsingInlineAsm;
81 /// SemaCallback - The Sema callback implementation. Must be set when parsing
82 /// ms-style inline assembly.
83 MCAsmParserSemaCallback *SemaCallback;
86 virtual ~MCTargetAsmParser();
88 unsigned getAvailableFeatures() const { return AvailableFeatures; }
89 void setAvailableFeatures(unsigned Value) { AvailableFeatures = Value; }
91 bool isParsingInlineAsm () { return ParsingInlineAsm; }
92 void setParsingInlineAsm (bool Value) { ParsingInlineAsm = Value; }
94 void setSemaCallback(MCAsmParserSemaCallback *Callback) {
95 SemaCallback = Callback;
98 virtual bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
101 /// ParseInstruction - Parse one assembly instruction.
103 /// The parser is positioned following the instruction name. The target
104 /// specific instruction parser should parse the entire instruction and
105 /// construct the appropriate MCInst, or emit an error. On success, the entire
106 /// line should be parsed up to and including the end-of-statement token. On
107 /// failure, the parser is not required to read to the end of the line.
109 /// \param Name - The instruction name.
110 /// \param NameLoc - The source location of the name.
111 /// \param Operands [out] - The list of parsed operands, this returns
112 /// ownership of them to the caller.
113 /// \return True on failure.
114 virtual bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
116 SmallVectorImpl<MCParsedAsmOperand*> &Operands) = 0;
118 /// ParseDirective - Parse a target specific assembler directive
120 /// The parser is positioned following the directive name. The target
121 /// specific directive parser should parse the entire directive doing or
122 /// recording any target specific work, or return true and do nothing if the
123 /// directive is not target specific. If the directive is specific for
124 /// the target, the entire line is parsed up to and including the
125 /// end-of-statement token and false is returned.
127 /// \param DirectiveID - the identifier token of the directive.
128 virtual bool ParseDirective(AsmToken DirectiveID) = 0;
130 /// mnemonicIsValid - This returns true if this is a valid mnemonic and false
132 virtual bool mnemonicIsValid(StringRef Mnemonic) = 0;
134 /// MatchAndEmitInstruction - Recognize a series of operands of a parsed
135 /// instruction as an actual MCInst and emit it to the specified MCStreamer.
136 /// This returns false on success and returns true on failure to match.
138 /// On failure, the target parser is responsible for emitting a diagnostic
139 /// explaining the match failure.
141 MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
142 SmallVectorImpl<MCParsedAsmOperand*> &Operands,
143 MCStreamer &Out, unsigned &ErrorInfo,
144 bool MatchingInlineAsm) = 0;
146 /// Allow a target to add special case operand matching for things that
147 /// tblgen doesn't/can't handle effectively. For example, literal
148 /// immediates on ARM. TableGen expects a token operand, but the parser
149 /// will recognize them as immediates.
150 virtual unsigned validateTargetOperandClass(MCParsedAsmOperand *Op,
152 return Match_InvalidOperand;
155 /// checkTargetMatchPredicate - Validate the instruction match against
156 /// any complex target predicates not expressible via match classes.
157 virtual unsigned checkTargetMatchPredicate(MCInst &Inst) {
158 return Match_Success;
161 virtual void convertToMapAndConstraints(unsigned Kind,
162 const SmallVectorImpl<MCParsedAsmOperand*> &Operands) = 0;
165 } // End llvm namespace