llvm/lib/MC/MCParser/MCTargetAsmParser.cpp

   1 //===-- MCTargetAsmParser.cpp - Target Assembly Parser --------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/MC/MCParser/MCTargetAsmParser.h"
  10 #include "llvm/MC/MCContext.h"
  11
  12 using namespace llvm;
  13
  14 MCTargetAsmParser::MCTargetAsmParser(MCTargetOptions const &MCOptions,
  15                                      const MCSubtargetInfo &STI,
  16                                      const MCInstrInfo &MII)
  17     : MCOptions(MCOptions), STI(&STI), MII(MII) {}
  18
  19 MCTargetAsmParser::~MCTargetAsmParser() = default;
  20
  21 MCSubtargetInfo &MCTargetAsmParser::copySTI() {
  22   MCSubtargetInfo &STICopy = getContext().getSubtargetCopy(getSTI());
  23   STI = &STICopy;
  24   return STICopy;
  25 }
  26
  27 const MCSubtargetInfo &MCTargetAsmParser::getSTI() const {
  28   return *STI;
  29 }
  30
  31 ParseStatus MCTargetAsmParser::parseDirective(AsmToken DirectiveID) {
  32   SMLoc StartTokLoc = getTok().getLoc();
  33   // Delegate to ParseDirective by default for transition period. Once the
  34   // transition is over, this method should just return NoMatch.
  35   bool Res = ParseDirective(DirectiveID);
  36
  37   // Some targets erroneously report success after emitting an error.
  38   if (getParser().hasPendingError())
  39     return ParseStatus::Failure;
  40
  41   // ParseDirective returns true if there was an error or if the directive is
  42   // not target-specific. Disambiguate the two cases by comparing position of
  43   // the lexer before and after calling the method: if no tokens were consumed,
  44   // there was no match, otherwise there was a failure.
  45   if (!Res)
  46     return ParseStatus::Success;
  47   if (getTok().getLoc() != StartTokLoc)
  48     return ParseStatus::Failure;
  49   return ParseStatus::NoMatch;
  50 }