1 //===- llvm/MC/MCAsmParser.h - Abstract Asm Parser Interface ----*- 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_MCPARSER_MCASMPARSER_H
11 #define LLVM_MC_MCPARSER_MCASMPARSER_H
13 #include "llvm/ADT/None.h"
14 #include "llvm/ADT/STLExtras.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/SmallVector.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/MC/MCParser/MCAsmLexer.h"
20 #include "llvm/Support/SMLoc.h"
28 class MCAsmParserExtension;
34 class MCTargetAsmParser;
37 struct InlineAsmIdentifierInfo {
39 IK_Invalid, // Initial state. Unexpected after a successful parsing.
40 IK_Label, // Function/Label reference.
41 IK_EnumVal, // Value of enumeration type.
44 // Represents an Enum value
45 struct EnumIdentifier {
48 // Represents a label/function reference
49 struct LabelIdentifier {
52 // Represents a variable
53 struct VariableIdentifier {
60 // An InlineAsm identifier can only be one of those
63 LabelIdentifier Label;
64 VariableIdentifier Var;
66 bool isKind(IdKind kind) const { return Kind == kind; }
68 void setEnum(int64_t enumVal) {
69 assert(isKind(IK_Invalid) && "should be initialized only once");
71 Enum.EnumVal = enumVal;
73 void setLabel(void *decl) {
74 assert(isKind(IK_Invalid) && "should be initialized only once");
78 void setVar(void *decl, bool isGlobalLV, unsigned size, unsigned type) {
79 assert(isKind(IK_Invalid) && "should be initialized only once");
82 Var.IsGlobalLV = isGlobalLV;
85 Var.Length = size / type;
87 InlineAsmIdentifierInfo() : Kind(IK_Invalid) {}
90 // Discriminate using the current kind.
94 /// Generic Sema callback for assembly parser.
95 class MCAsmParserSemaCallback {
97 virtual ~MCAsmParserSemaCallback();
99 virtual void LookupInlineAsmIdentifier(StringRef &LineBuf,
100 InlineAsmIdentifierInfo &Info,
101 bool IsUnevaluatedContext) = 0;
102 virtual StringRef LookupInlineAsmLabel(StringRef Identifier, SourceMgr &SM,
103 SMLoc Location, bool Create) = 0;
104 virtual bool LookupInlineAsmField(StringRef Base, StringRef Member,
105 unsigned &Offset) = 0;
108 /// Generic assembler parser interface, for use by target specific
109 /// assembly parsers.
112 using DirectiveHandler = bool (*)(MCAsmParserExtension*, StringRef, SMLoc);
113 using ExtensionDirectiveHandler =
114 std::pair<MCAsmParserExtension*, DirectiveHandler>;
116 struct MCPendingError {
123 MCTargetAsmParser *TargetParser = nullptr;
125 unsigned ShowParsedOperands : 1;
127 protected: // Can only create subclasses.
130 /// Flag tracking whether any errors have been encountered.
131 bool HadError = false;
132 /// Enable print [latency:throughput] in output file.
133 bool EnablePrintSchedInfo = false;
135 SmallVector<MCPendingError, 1> PendingErrors;
138 MCAsmParser(const MCAsmParser &) = delete;
139 MCAsmParser &operator=(const MCAsmParser &) = delete;
140 virtual ~MCAsmParser();
142 virtual void addDirectiveHandler(StringRef Directive,
143 ExtensionDirectiveHandler Handler) = 0;
145 virtual void addAliasForDirective(StringRef Directive, StringRef Alias) = 0;
147 virtual SourceMgr &getSourceManager() = 0;
149 virtual MCAsmLexer &getLexer() = 0;
150 const MCAsmLexer &getLexer() const {
151 return const_cast<MCAsmParser*>(this)->getLexer();
154 virtual MCContext &getContext() = 0;
156 /// Return the output streamer for the assembler.
157 virtual MCStreamer &getStreamer() = 0;
159 MCTargetAsmParser &getTargetParser() const { return *TargetParser; }
160 void setTargetParser(MCTargetAsmParser &P);
162 virtual unsigned getAssemblerDialect() { return 0;}
163 virtual void setAssemblerDialect(unsigned i) { }
165 bool getShowParsedOperands() const { return ShowParsedOperands; }
166 void setShowParsedOperands(bool Value) { ShowParsedOperands = Value; }
168 void setEnablePrintSchedInfo(bool Value) { EnablePrintSchedInfo = Value; }
169 bool shouldPrintSchedInfo() { return EnablePrintSchedInfo; }
171 /// Run the parser on the input source buffer.
172 virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false) = 0;
174 virtual void setParsingInlineAsm(bool V) = 0;
175 virtual bool isParsingInlineAsm() = 0;
177 /// Parse MS-style inline assembly.
178 virtual bool parseMSInlineAsm(
179 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
180 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
181 SmallVectorImpl<std::string> &Constraints,
182 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
183 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) = 0;
185 /// Emit a note at the location \p L, with the message \p Msg.
186 virtual void Note(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
188 /// Emit a warning at the location \p L, with the message \p Msg.
190 /// \return The return value is true, if warnings are fatal.
191 virtual bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
193 /// Return an error at the location \p L, with the message \p Msg. This
194 /// may be modified before being emitted.
196 /// \return The return value is always true, as an idiomatic convenience to
198 bool Error(SMLoc L, const Twine &Msg, SMRange Range = None);
200 /// Emit an error at the location \p L, with the message \p Msg.
202 /// \return The return value is always true, as an idiomatic convenience to
204 virtual bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
206 bool hasPendingError() { return !PendingErrors.empty(); }
208 bool printPendingErrors() {
209 bool rv = !PendingErrors.empty();
210 for (auto Err : PendingErrors) {
211 printError(Err.Loc, Twine(Err.Msg), Err.Range);
213 PendingErrors.clear();
217 void clearPendingErrors() { PendingErrors.clear(); }
219 bool addErrorSuffix(const Twine &Suffix);
221 /// Get the next AsmToken in the stream, possibly handling file
223 virtual const AsmToken &Lex() = 0;
225 /// Get the current AsmToken from the stream.
226 const AsmToken &getTok() const;
228 /// Report an error at the current lexer location.
229 bool TokError(const Twine &Msg, SMRange Range = None);
231 bool parseTokenLoc(SMLoc &Loc);
232 bool parseToken(AsmToken::TokenKind T, const Twine &Msg = "unexpected token");
233 /// Attempt to parse and consume token, returning true on
235 bool parseOptionalToken(AsmToken::TokenKind T);
237 bool parseEOL(const Twine &ErrMsg);
239 bool parseMany(function_ref<bool()> parseOne, bool hasComma = true);
241 bool parseIntToken(int64_t &V, const Twine &ErrMsg);
243 bool check(bool P, const Twine &Msg);
244 bool check(bool P, SMLoc Loc, const Twine &Msg);
246 /// Parse an identifier or string (as a quoted identifier) and set \p
247 /// Res to the identifier contents.
248 virtual bool parseIdentifier(StringRef &Res) = 0;
250 /// Parse up to the end of statement and return the contents from the
251 /// current token until the end of the statement; the current token on exit
252 /// will be either the EndOfStatement or EOF.
253 virtual StringRef parseStringToEndOfStatement() = 0;
255 /// Parse the current token as a string which may include escaped
256 /// characters and return the string contents.
257 virtual bool parseEscapedString(std::string &Data) = 0;
259 /// Skip to the end of the current statement, for error recovery.
260 virtual void eatToEndOfStatement() = 0;
262 /// Parse an arbitrary expression.
264 /// \param Res - The value of the expression. The result is undefined
266 /// \return - False on success.
267 virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
268 bool parseExpression(const MCExpr *&Res);
270 /// Parse a primary expression.
272 /// \param Res - The value of the expression. The result is undefined
274 /// \return - False on success.
275 virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) = 0;
277 /// Parse an arbitrary expression, assuming that an initial '(' has
278 /// already been consumed.
280 /// \param Res - The value of the expression. The result is undefined
282 /// \return - False on success.
283 virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
285 /// Parse an expression which must evaluate to an absolute value.
287 /// \param Res - The value of the absolute expression. The result is undefined
289 /// \return - False on success.
290 virtual bool parseAbsoluteExpression(int64_t &Res) = 0;
292 /// Ensure that we have a valid section set in the streamer. Otherwise,
293 /// report an error and switch to .text.
294 /// \return - False on success.
295 virtual bool checkForValidSection() = 0;
297 /// Parse an arbitrary expression of a specified parenthesis depth,
298 /// assuming that the initial '(' characters have already been consumed.
300 /// \param ParenDepth - Specifies how many trailing expressions outside the
301 /// current parentheses we have to parse.
302 /// \param Res - The value of the expression. The result is undefined
304 /// \return - False on success.
305 virtual bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
309 /// Create an MCAsmParser instance.
310 MCAsmParser *createMCAsmParser(SourceMgr &, MCContext &, MCStreamer &,
311 const MCAsmInfo &, unsigned CB = 0);
313 } // end namespace llvm
315 #endif // LLVM_MC_MCPARSER_MCASMPARSER_H