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/AsmLexer.h"
13 #include "llvm/MC/MCStreamer.h"
14
15 using namespace llvm;
16
17 MCAsmParserExtension::MCAsmParserExtension() = default;
18
19 MCAsmParserExtension::~MCAsmParserExtension() = default;
20
Initialize(MCAsmParser & Parser)21 void MCAsmParserExtension::Initialize(MCAsmParser &Parser) {
22 this->Parser = &Parser;
23 }
24
25 /// parseDirectiveCGProfile
26 /// ::= .cg_profile identifier, identifier, <number>
parseDirectiveCGProfile(StringRef,SMLoc)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(Count))
48 return true;
49
50 if (getLexer().isNot(AsmToken::EndOfStatement))
51 return TokError("unexpected token in directive");
52
53 MCSymbol *FromSym = getContext().parseSymbol(From);
54 MCSymbol *ToSym = getContext().parseSymbol(To);
55
56 getStreamer().emitCGProfileEntry(
57 MCSymbolRefExpr::create(FromSym, getContext(), FromLoc),
58 MCSymbolRefExpr::create(ToSym, getContext(), ToLoc), Count);
59 return false;
60 }
61
maybeParseUniqueID(int64_t & UniqueID)62 bool MCAsmParserExtension::maybeParseUniqueID(int64_t &UniqueID) {
63 AsmLexer &L = getLexer();
64 if (L.isNot(AsmToken::Comma))
65 return false;
66 Lex();
67 StringRef UniqueStr;
68 if (getParser().parseIdentifier(UniqueStr))
69 return TokError("expected identifier");
70 if (UniqueStr != "unique")
71 return TokError("expected 'unique'");
72 if (L.isNot(AsmToken::Comma))
73 return TokError("expected commma");
74 Lex();
75 if (getParser().parseAbsoluteExpression(UniqueID))
76 return true;
77 if (UniqueID < 0)
78 return TokError("unique id must be positive");
79 if (!isUInt<32>(UniqueID) || UniqueID == ~0U)
80 return TokError("unique id is too large");
81 return false;
82 }
83