1 | //===-- MCAsmParser.cpp - Abstract Asm Parser Interface -------------------===// |
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/MCAsmParser.h" |
10 | #include "llvm/ADT/StringRef.h" |
11 | #include "llvm/ADT/Twine.h" |
12 | #include "llvm/Config/llvm-config.h" |
13 | #include "llvm/MC/MCAsmInfo.h" |
14 | #include "llvm/MC/MCParser/AsmLexer.h" |
15 | #include "llvm/MC/MCParser/MCParsedAsmOperand.h" |
16 | #include "llvm/MC/MCParser/MCTargetAsmParser.h" |
17 | #include "llvm/Support/CommandLine.h" |
18 | #include "llvm/Support/Debug.h" |
19 | #include "llvm/Support/SMLoc.h" |
20 | #include "llvm/Support/raw_ostream.h" |
21 | #include <cassert> |
22 | |
23 | using namespace llvm; |
24 | |
25 | namespace llvm { |
26 | cl::opt<unsigned> AsmMacroMaxNestingDepth( |
27 | "asm-macro-max-nesting-depth" , cl::init(Val: 20), cl::Hidden, |
28 | cl::desc("The maximum nesting depth allowed for assembly macros." )); |
29 | } |
30 | |
31 | MCAsmParser::MCAsmParser(MCContext &Ctx, MCStreamer &Out, SourceMgr &SM, |
32 | const MCAsmInfo &MAI) |
33 | : Ctx(Ctx), Out(Out), SrcMgr(SM), MAI(MAI), Lexer(MAI) {} |
34 | |
35 | MCAsmParser::~MCAsmParser() = default; |
36 | |
37 | void MCAsmParser::setTargetParser(MCTargetAsmParser &P) { |
38 | assert(!TargetParser && "Target parser is already initialized!" ); |
39 | TargetParser = &P; |
40 | TargetParser->Initialize(Parser&: *this); |
41 | } |
42 | |
43 | const AsmToken &MCAsmParser::getTok() const { |
44 | return getLexer().getTok(); |
45 | } |
46 | |
47 | bool MCAsmParser::parseTokenLoc(SMLoc &Loc) { |
48 | Loc = getTok().getLoc(); |
49 | return false; |
50 | } |
51 | |
52 | bool MCAsmParser::parseEOL() { |
53 | if (getTok().getKind() != AsmToken::EndOfStatement) |
54 | return Error(L: getTok().getLoc(), Msg: "expected newline" ); |
55 | Lex(); |
56 | return false; |
57 | } |
58 | |
59 | bool MCAsmParser::parseEOL(const Twine &Msg) { |
60 | if (getTok().getKind() != AsmToken::EndOfStatement) |
61 | return Error(L: getTok().getLoc(), Msg); |
62 | Lex(); |
63 | return false; |
64 | } |
65 | |
66 | bool MCAsmParser::parseToken(AsmToken::TokenKind T, const Twine &Msg) { |
67 | if (T == AsmToken::EndOfStatement) |
68 | return parseEOL(Msg); |
69 | if (getTok().getKind() != T) |
70 | return Error(L: getTok().getLoc(), Msg); |
71 | Lex(); |
72 | return false; |
73 | } |
74 | |
75 | bool MCAsmParser::parseIntToken(int64_t &V, const Twine &Msg) { |
76 | if (getTok().getKind() != AsmToken::Integer) |
77 | return TokError(Msg); |
78 | V = getTok().getIntVal(); |
79 | Lex(); |
80 | return false; |
81 | } |
82 | |
83 | bool MCAsmParser::parseOptionalToken(AsmToken::TokenKind T) { |
84 | bool Present = (getTok().getKind() == T); |
85 | if (Present) |
86 | parseToken(T); |
87 | return Present; |
88 | } |
89 | |
90 | bool MCAsmParser::check(bool P, const Twine &Msg) { |
91 | return check(P, Loc: getTok().getLoc(), Msg); |
92 | } |
93 | |
94 | bool MCAsmParser::check(bool P, SMLoc Loc, const Twine &Msg) { |
95 | if (P) |
96 | return Error(L: Loc, Msg); |
97 | return false; |
98 | } |
99 | |
100 | bool MCAsmParser::TokError(const Twine &Msg, SMRange Range) { |
101 | return Error(L: getLexer().getLoc(), Msg, Range); |
102 | } |
103 | |
104 | bool MCAsmParser::Error(SMLoc L, const Twine &Msg, SMRange Range) { |
105 | MCPendingError PErr; |
106 | PErr.Loc = L; |
107 | Msg.toVector(Out&: PErr.Msg); |
108 | PErr.Range = Range; |
109 | PendingErrors.push_back(Elt: PErr); |
110 | |
111 | // If we threw this parsing error after a lexing error, this should |
112 | // supercede the lexing error and so we remove it from the Lexer |
113 | // before it can propagate |
114 | if (getTok().is(K: AsmToken::Error)) |
115 | getLexer().Lex(); |
116 | return true; |
117 | } |
118 | |
119 | bool MCAsmParser::addErrorSuffix(const Twine &Suffix) { |
120 | // Make sure lexing errors have propagated to the parser. |
121 | if (getTok().is(K: AsmToken::Error)) |
122 | Lex(); |
123 | for (auto &PErr : PendingErrors) |
124 | Suffix.toVector(Out&: PErr.Msg); |
125 | return true; |
126 | } |
127 | |
128 | bool MCAsmParser::parseMany(function_ref<bool()> parseOne, bool hasComma) { |
129 | if (parseOptionalToken(T: AsmToken::EndOfStatement)) |
130 | return false; |
131 | while (true) { |
132 | if (parseOne()) |
133 | return true; |
134 | if (parseOptionalToken(T: AsmToken::EndOfStatement)) |
135 | return false; |
136 | if (hasComma && parseToken(T: AsmToken::Comma)) |
137 | return true; |
138 | } |
139 | return false; |
140 | } |
141 | |
142 | bool MCAsmParser::parseExpression(const MCExpr *&Res) { |
143 | SMLoc L; |
144 | return parseExpression(Res, EndLoc&: L); |
145 | } |
146 | |
147 | bool MCAsmParser::parseGNUAttribute(SMLoc L, int64_t &Tag, |
148 | int64_t &IntegerValue) { |
149 | // Parse a .gnu_attribute with numerical tag and value. |
150 | StringRef S(L.getPointer()); |
151 | SMLoc TagLoc; |
152 | TagLoc = getTok().getLoc(); |
153 | const AsmToken &Tok = getTok(); |
154 | if (Tok.isNot(K: AsmToken::Integer)) |
155 | return false; |
156 | Tag = Tok.getIntVal(); |
157 | Lex(); // Eat the Tag |
158 | Lex(); // Eat the comma |
159 | if (Tok.isNot(K: AsmToken::Integer)) |
160 | return false; |
161 | IntegerValue = Tok.getIntVal(); |
162 | Lex(); // Eat the IntegerValue |
163 | return true; |
164 | } |
165 | |
166 | void MCParsedAsmOperand::dump() const { |
167 | // Cannot completely remove virtual function even in release mode. |
168 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
169 | dbgs() << " " ; |
170 | print(dbgs(), MCAsmInfo()); |
171 | #endif |
172 | } |
173 | |