llvm/lib/MC/MCParser/MCAsmParserExtension.cpp

   1 //===- MCAsmParserExtension.cpp - Asm Parser Hooks ------------------------===//
   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/MCAsmParserExtension.h"
  10 #include "llvm/MC/MCContext.h"
  11 #include "llvm/MC/MCExpr.h"
  12 #include "llvm/MC/MCParser/MCAsmLexer.h"
  13 #include "llvm/MC/MCStreamer.h"
  14
  15 using namespace llvm;
  16
  17 MCAsmParserExtension::MCAsmParserExtension() = default;
  18
  19 MCAsmParserExtension::~MCAsmParserExtension() = default;
  20
  21 void MCAsmParserExtension::Initialize(MCAsmParser &Parser) {
  22   this->Parser = &Parser;
  23 }
  24
  25 /// ParseDirectiveCGProfile
  26 ///  ::= .cg_profile identifier, identifier, <number>
  27 bool MCAsmParserExtension::ParseDirectiveCGProfile(StringRef, SMLoc) {
  28   StringRef From;
  29   SMLoc FromLoc = getLexer().getLoc();
  30   if (getParser().parseIdentifier(From))
  31     return TokError("expected identifier in directive");
  32
  33   if (getLexer().isNot(AsmToken::Comma))
  34     return TokError("expected a comma");
  35   Lex();
  36
  37   StringRef To;
  38   SMLoc ToLoc = getLexer().getLoc();
  39   if (getParser().parseIdentifier(To))
  40     return TokError("expected identifier in directive");
  41
  42   if (getLexer().isNot(AsmToken::Comma))
  43     return TokError("expected a comma");
  44   Lex();
  45
  46   int64_t Count;
  47   if (getParser().parseIntToken(
  48           Count, "expected integer count in '.cg_profile' directive"))
  49     return true;
  50
  51   if (getLexer().isNot(AsmToken::EndOfStatement))
  52     return TokError("unexpected token in directive");
  53
  54   MCSymbol *FromSym = getContext().getOrCreateSymbol(From);
  55   MCSymbol *ToSym = getContext().getOrCreateSymbol(To);
  56
  57   getStreamer().emitCGProfileEntry(
  58       MCSymbolRefExpr::create(FromSym, MCSymbolRefExpr::VK_None, getContext(),
  59                               FromLoc),
  60       MCSymbolRefExpr::create(ToSym, MCSymbolRefExpr::VK_None, getContext(),
  61                               ToLoc),
  62       Count);
  63   return false;
  64 }