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 protected: // Can only create subclasses.
128 SmallVector<MCPendingError, 0> PendingErrors;
130 /// Flag tracking whether any errors have been encountered.
131 bool HadError = false;
133 /// Enable print [latency:throughput] in output file.
134 bool EnablePrintSchedInfo = false;
136 bool ShowParsedOperands = false;
139 MCAsmParser(const MCAsmParser &) = delete;
140 MCAsmParser &operator=(const MCAsmParser &) = delete;
141 virtual ~MCAsmParser();
143 virtual void addDirectiveHandler(StringRef Directive,
144 ExtensionDirectiveHandler Handler) = 0;
146 virtual void addAliasForDirective(StringRef Directive, StringRef Alias) = 0;
148 virtual SourceMgr &getSourceManager() = 0;
150 virtual MCAsmLexer &getLexer() = 0;
151 const MCAsmLexer &getLexer() const {
152 return const_cast<MCAsmParser*>(this)->getLexer();
155 virtual MCContext &getContext() = 0;
157 /// Return the output streamer for the assembler.
158 virtual MCStreamer &getStreamer() = 0;
160 MCTargetAsmParser &getTargetParser() const { return *TargetParser; }
161 void setTargetParser(MCTargetAsmParser &P);
163 virtual unsigned getAssemblerDialect() { return 0;}
164 virtual void setAssemblerDialect(unsigned i) { }
166 bool getShowParsedOperands() const { return ShowParsedOperands; }
167 void setShowParsedOperands(bool Value) { ShowParsedOperands = Value; }
169 void setEnablePrintSchedInfo(bool Value) { EnablePrintSchedInfo = Value; }
170 bool shouldPrintSchedInfo() const { return EnablePrintSchedInfo; }
172 /// Run the parser on the input source buffer.
173 virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false) = 0;
175 virtual void setParsingInlineAsm(bool V) = 0;
176 virtual bool isParsingInlineAsm() = 0;
178 /// Parse MS-style inline assembly.
179 virtual bool parseMSInlineAsm(
180 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
181 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
182 SmallVectorImpl<std::string> &Constraints,
183 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
184 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) = 0;
186 /// Emit a note at the location \p L, with the message \p Msg.
187 virtual void Note(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
189 /// Emit a warning at the location \p L, with the message \p Msg.
191 /// \return The return value is true, if warnings are fatal.
192 virtual bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
194 /// Return an error at the location \p L, with the message \p Msg. This
195 /// may be modified before being emitted.
197 /// \return The return value is always true, as an idiomatic convenience to
199 bool Error(SMLoc L, const Twine &Msg, SMRange Range = None);
201 /// Emit an error at the location \p L, with the message \p Msg.
203 /// \return The return value is always true, as an idiomatic convenience to
205 virtual bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
207 bool hasPendingError() { return !PendingErrors.empty(); }
209 bool printPendingErrors() {
210 bool rv = !PendingErrors.empty();
211 for (auto Err : PendingErrors) {
212 printError(Err.Loc, Twine(Err.Msg), Err.Range);
214 PendingErrors.clear();
218 void clearPendingErrors() { PendingErrors.clear(); }
220 bool addErrorSuffix(const Twine &Suffix);
222 /// Get the next AsmToken in the stream, possibly handling file
224 virtual const AsmToken &Lex() = 0;
226 /// Get the current AsmToken from the stream.
227 const AsmToken &getTok() const;
229 /// Report an error at the current lexer location.
230 bool TokError(const Twine &Msg, SMRange Range = None);
232 bool parseTokenLoc(SMLoc &Loc);
233 bool parseToken(AsmToken::TokenKind T, const Twine &Msg = "unexpected token");
234 /// Attempt to parse and consume token, returning true on
236 bool parseOptionalToken(AsmToken::TokenKind T);
238 bool parseEOL(const Twine &ErrMsg);
240 bool parseMany(function_ref<bool()> parseOne, bool hasComma = true);
242 bool parseIntToken(int64_t &V, const Twine &ErrMsg);
244 bool check(bool P, const Twine &Msg);
245 bool check(bool P, SMLoc Loc, const Twine &Msg);
247 /// Parse an identifier or string (as a quoted identifier) and set \p
248 /// Res to the identifier contents.
249 virtual bool parseIdentifier(StringRef &Res) = 0;
251 /// Parse up to the end of statement and return the contents from the
252 /// current token until the end of the statement; the current token on exit
253 /// will be either the EndOfStatement or EOF.
254 virtual StringRef parseStringToEndOfStatement() = 0;
256 /// Parse the current token as a string which may include escaped
257 /// characters and return the string contents.
258 virtual bool parseEscapedString(std::string &Data) = 0;
260 /// Skip to the end of the current statement, for error recovery.
261 virtual void eatToEndOfStatement() = 0;
263 /// Parse an arbitrary expression.
265 /// \param Res - The value of the expression. The result is undefined
267 /// \return - False on success.
268 virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
269 bool parseExpression(const MCExpr *&Res);
271 /// Parse a primary expression.
273 /// \param Res - The value of the expression. The result is undefined
275 /// \return - False on success.
276 virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) = 0;
278 /// Parse an arbitrary expression, assuming that an initial '(' has
279 /// already been consumed.
281 /// \param Res - The value of the expression. The result is undefined
283 /// \return - False on success.
284 virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
286 /// Parse an expression which must evaluate to an absolute value.
288 /// \param Res - The value of the absolute expression. The result is undefined
290 /// \return - False on success.
291 virtual bool parseAbsoluteExpression(int64_t &Res) = 0;
293 /// Ensure that we have a valid section set in the streamer. Otherwise,
294 /// report an error and switch to .text.
295 /// \return - False on success.
296 virtual bool checkForValidSection() = 0;
298 /// Parse an arbitrary expression of a specified parenthesis depth,
299 /// assuming that the initial '(' characters have already been consumed.
301 /// \param ParenDepth - Specifies how many trailing expressions outside the
302 /// current parentheses we have to parse.
303 /// \param Res - The value of the expression. The result is undefined
305 /// \return - False on success.
306 virtual bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
310 /// Create an MCAsmParser instance.
311 MCAsmParser *createMCAsmParser(SourceMgr &, MCContext &, MCStreamer &,
312 const MCAsmInfo &, unsigned CB = 0);
314 } // end namespace llvm
316 #endif // LLVM_MC_MCPARSER_MCASMPARSER_H