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31c0c9a1f6
Allow a target assembly parser to do context sensitive constraint checking on a potential instruction match. This will be used, for example, to handle Thumb2 IT block parsing. llvm-svn: 137675
104 lines
3.7 KiB
C++
104 lines
3.7 KiB
C++
//===-- llvm/MC/MCTargetAsmParser.h - Target Assembly Parser ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_TARGETPARSER_H
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#define LLVM_MC_TARGETPARSER_H
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#include "llvm/MC/MCParser/MCAsmParserExtension.h"
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namespace llvm {
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class MCStreamer;
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class StringRef;
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class SMLoc;
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class AsmToken;
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class MCParsedAsmOperand;
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class MCInst;
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template <typename T> class SmallVectorImpl;
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/// MCTargetAsmParser - Generic interface to target specific assembly parsers.
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class MCTargetAsmParser : public MCAsmParserExtension {
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public:
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enum MatchResultTy {
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Match_ConversionFail,
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Match_InvalidOperand,
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Match_MissingFeature,
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Match_MnemonicFail,
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Match_Success,
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FIRST_TARGET_MATCH_RESULT_TY
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};
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private:
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MCTargetAsmParser(const MCTargetAsmParser &); // DO NOT IMPLEMENT
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void operator=(const MCTargetAsmParser &); // DO NOT IMPLEMENT
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protected: // Can only create subclasses.
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MCTargetAsmParser();
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/// AvailableFeatures - The current set of available features.
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unsigned AvailableFeatures;
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public:
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virtual ~MCTargetAsmParser();
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unsigned getAvailableFeatures() const { return AvailableFeatures; }
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void setAvailableFeatures(unsigned Value) { AvailableFeatures = Value; }
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virtual bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
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SMLoc &EndLoc) = 0;
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/// ParseInstruction - Parse one assembly instruction.
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///
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/// The parser is positioned following the instruction name. The target
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/// specific instruction parser should parse the entire instruction and
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/// construct the appropriate MCInst, or emit an error. On success, the entire
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/// line should be parsed up to and including the end-of-statement token. On
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/// failure, the parser is not required to read to the end of the line.
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//
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/// \param Name - The instruction name.
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/// \param NameLoc - The source location of the name.
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/// \param Operands [out] - The list of parsed operands, this returns
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/// ownership of them to the caller.
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/// \return True on failure.
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virtual bool ParseInstruction(StringRef Name, SMLoc NameLoc,
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SmallVectorImpl<MCParsedAsmOperand*> &Operands) = 0;
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/// ParseDirective - Parse a target specific assembler directive
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///
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/// The parser is positioned following the directive name. The target
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/// specific directive parser should parse the entire directive doing or
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/// recording any target specific work, or return true and do nothing if the
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/// directive is not target specific. If the directive is specific for
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/// the target, the entire line is parsed up to and including the
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/// end-of-statement token and false is returned.
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///
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/// \param DirectiveID - the identifier token of the directive.
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virtual bool ParseDirective(AsmToken DirectiveID) = 0;
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/// MatchAndEmitInstruction - Recognize a series of operands of a parsed
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/// instruction as an actual MCInst and emit it to the specified MCStreamer.
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/// This returns false on success and returns true on failure to match.
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///
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/// On failure, the target parser is responsible for emitting a diagnostic
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/// explaining the match failure.
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virtual bool
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MatchAndEmitInstruction(SMLoc IDLoc,
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SmallVectorImpl<MCParsedAsmOperand*> &Operands,
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MCStreamer &Out) = 0;
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/// checkTargetMatchPredicate - Validate the instruction match against
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/// any complex target predicates not expressible via match classes.
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virtual unsigned checkTargetMatchPredicate(MCInst &Inst) {
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return Match_Success;
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}
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};
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} // End llvm namespace
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#endif
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