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
23using namespace llvm;
24
25namespace llvm {
26cl::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
31MCAsmParser::MCAsmParser(MCContext &Ctx, MCStreamer &Out, SourceMgr &SM,
32 const MCAsmInfo &MAI)
33 : Ctx(Ctx), Out(Out), SrcMgr(SM), MAI(MAI), Lexer(MAI) {}
34
35MCAsmParser::~MCAsmParser() = default;
36
37void MCAsmParser::setTargetParser(MCTargetAsmParser &P) {
38 assert(!TargetParser && "Target parser is already initialized!");
39 TargetParser = &P;
40 TargetParser->Initialize(Parser&: *this);
41}
42
43const AsmToken &MCAsmParser::getTok() const {
44 return getLexer().getTok();
45}
46
47bool MCAsmParser::parseTokenLoc(SMLoc &Loc) {
48 Loc = getTok().getLoc();
49 return false;
50}
51
52bool MCAsmParser::parseEOL() {
53 if (getTok().getKind() != AsmToken::EndOfStatement)
54 return Error(L: getTok().getLoc(), Msg: "expected newline");
55 Lex();
56 return false;
57}
58
59bool 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
66bool 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
75bool 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
83bool MCAsmParser::parseOptionalToken(AsmToken::TokenKind T) {
84 bool Present = (getTok().getKind() == T);
85 if (Present)
86 parseToken(T);
87 return Present;
88}
89
90bool MCAsmParser::check(bool P, const Twine &Msg) {
91 return check(P, Loc: getTok().getLoc(), Msg);
92}
93
94bool MCAsmParser::check(bool P, SMLoc Loc, const Twine &Msg) {
95 if (P)
96 return Error(L: Loc, Msg);
97 return false;
98}
99
100bool MCAsmParser::TokError(const Twine &Msg, SMRange Range) {
101 return Error(L: getLexer().getLoc(), Msg, Range);
102}
103
104bool 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
119bool 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
128bool 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
142bool MCAsmParser::parseExpression(const MCExpr *&Res) {
143 SMLoc L;
144 return parseExpression(Res, EndLoc&: L);
145}
146
147bool 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
166void 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