1 //===-- MCAsmParser.cpp - Abstract Asm Parser Interface -------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/MC/MCParser/MCAsmParser.h"
11 #include "llvm/ADT/StringRef.h"
12 #include "llvm/ADT/Twine.h"
13 #include "llvm/Config/llvm-config.h"
14 #include "llvm/MC/MCParser/MCAsmLexer.h"
15 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
16 #include "llvm/MC/MCParser/MCTargetAsmParser.h"
17 #include "llvm/Support/Debug.h"
18 #include "llvm/Support/SMLoc.h"
19 #include "llvm/Support/raw_ostream.h"
20 #include <cassert>
21 
22 using namespace llvm;
23 
24 MCAsmParser::MCAsmParser() {}
25 
26 MCAsmParser::~MCAsmParser() = default;
27 
28 void MCAsmParser::setTargetParser(MCTargetAsmParser &P) {
29   assert(!TargetParser && "Target parser is already initialized!");
30   TargetParser = &P;
31   TargetParser->Initialize(*this);
32 }
33 
34 const AsmToken &MCAsmParser::getTok() const {
35   return getLexer().getTok();
36 }
37 
38 bool MCAsmParser::parseTokenLoc(SMLoc &Loc) {
39   Loc = getTok().getLoc();
40   return false;
41 }
42 
43 bool MCAsmParser::parseEOL(const Twine &Msg) {
44   if (getTok().getKind() != AsmToken::EndOfStatement)
45     return Error(getTok().getLoc(), Msg);
46   Lex();
47   return false;
48 }
49 
50 bool MCAsmParser::parseToken(AsmToken::TokenKind T, const Twine &Msg) {
51   if (T == AsmToken::EndOfStatement)
52     return parseEOL(Msg);
53   if (getTok().getKind() != T)
54     return Error(getTok().getLoc(), Msg);
55   Lex();
56   return false;
57 }
58 
59 bool MCAsmParser::parseIntToken(int64_t &V, const Twine &Msg) {
60   if (getTok().getKind() != AsmToken::Integer)
61     return TokError(Msg);
62   V = getTok().getIntVal();
63   Lex();
64   return false;
65 }
66 
67 bool MCAsmParser::parseOptionalToken(AsmToken::TokenKind T) {
68   bool Present = (getTok().getKind() == T);
69   if (Present)
70     parseToken(T);
71   return Present;
72 }
73 
74 bool MCAsmParser::check(bool P, const Twine &Msg) {
75   return check(P, getTok().getLoc(), Msg);
76 }
77 
78 bool MCAsmParser::check(bool P, SMLoc Loc, const Twine &Msg) {
79   if (P)
80     return Error(Loc, Msg);
81   return false;
82 }
83 
84 bool MCAsmParser::TokError(const Twine &Msg, SMRange Range) {
85   return Error(getLexer().getLoc(), Msg, Range);
86 }
87 
88 bool MCAsmParser::Error(SMLoc L, const Twine &Msg, SMRange Range) {
89 
90   MCPendingError PErr;
91   PErr.Loc = L;
92   Msg.toVector(PErr.Msg);
93   PErr.Range = Range;
94   PendingErrors.push_back(PErr);
95 
96   // If we threw this parsing error after a lexing error, this should
97   // supercede the lexing error and so we remove it from the Lexer
98   // before it can propagate
99   if (getTok().is(AsmToken::Error))
100     getLexer().Lex();
101   return true;
102 }
103 
104 bool MCAsmParser::addErrorSuffix(const Twine &Suffix) {
105   // Make sure lexing errors have propagated to the parser.
106   if (getTok().is(AsmToken::Error))
107     Lex();
108   for (auto &PErr : PendingErrors)
109     Suffix.toVector(PErr.Msg);
110   return true;
111 }
112 
113 bool MCAsmParser::parseMany(function_ref<bool()> parseOne, bool hasComma) {
114   if (parseOptionalToken(AsmToken::EndOfStatement))
115     return false;
116   while (true) {
117     if (parseOne())
118       return true;
119     if (parseOptionalToken(AsmToken::EndOfStatement))
120       return false;
121     if (hasComma && parseToken(AsmToken::Comma))
122       return true;
123   }
124   return false;
125 }
126 
127 bool MCAsmParser::parseExpression(const MCExpr *&Res) {
128   SMLoc L;
129   return parseExpression(Res, L);
130 }
131 
132 void MCParsedAsmOperand::dump() const {
133   // Cannot completely remove virtual function even in release mode.
134 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
135   dbgs() << "  " << *this;
136 #endif
137 }
138