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 }
65