LexerUtils.cpp
5.18 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
//===--- LexerUtils.cpp - clang-tidy---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "LexerUtils.h"
namespace clang {
namespace tidy {
namespace utils {
namespace lexer {
Token getPreviousToken(SourceLocation Location, const SourceManager &SM,
const LangOptions &LangOpts, bool SkipComments) {
Token Token;
Token.setKind(tok::unknown);
Location = Location.getLocWithOffset(-1);
if (Location.isInvalid())
return Token;
auto StartOfFile = SM.getLocForStartOfFile(SM.getFileID(Location));
while (Location != StartOfFile) {
Location = Lexer::GetBeginningOfToken(Location, SM, LangOpts);
if (!Lexer::getRawToken(Location, Token, SM, LangOpts) &&
(!SkipComments || !Token.is(tok::comment))) {
break;
}
Location = Location.getLocWithOffset(-1);
}
return Token;
}
SourceLocation findPreviousTokenStart(SourceLocation Start,
const SourceManager &SM,
const LangOptions &LangOpts) {
if (Start.isInvalid() || Start.isMacroID())
return SourceLocation();
SourceLocation BeforeStart = Start.getLocWithOffset(-1);
if (BeforeStart.isInvalid() || BeforeStart.isMacroID())
return SourceLocation();
return Lexer::GetBeginningOfToken(BeforeStart, SM, LangOpts);
}
SourceLocation findPreviousTokenKind(SourceLocation Start,
const SourceManager &SM,
const LangOptions &LangOpts,
tok::TokenKind TK) {
if (Start.isInvalid() || Start.isMacroID())
return SourceLocation();
while (true) {
SourceLocation L = findPreviousTokenStart(Start, SM, LangOpts);
if (L.isInvalid() || L.isMacroID())
return SourceLocation();
Token T;
if (Lexer::getRawToken(L, T, SM, LangOpts, /*IgnoreWhiteSpace=*/true))
return SourceLocation();
if (T.is(TK))
return T.getLocation();
Start = L;
}
}
SourceLocation findNextTerminator(SourceLocation Start, const SourceManager &SM,
const LangOptions &LangOpts) {
return findNextAnyTokenKind(Start, SM, LangOpts, tok::comma, tok::semi);
}
Optional<Token> findNextTokenSkippingComments(SourceLocation Start,
const SourceManager &SM,
const LangOptions &LangOpts) {
Optional<Token> CurrentToken;
do {
CurrentToken = Lexer::findNextToken(Start, SM, LangOpts);
} while (CurrentToken && CurrentToken->is(tok::comment));
return CurrentToken;
}
bool rangeContainsExpansionsOrDirectives(SourceRange Range,
const SourceManager &SM,
const LangOptions &LangOpts) {
assert(Range.isValid() && "Invalid Range for relexing provided");
SourceLocation Loc = Range.getBegin();
while (Loc < Range.getEnd()) {
if (Loc.isMacroID())
return true;
llvm::Optional<Token> Tok = Lexer::findNextToken(Loc, SM, LangOpts);
if (!Tok)
return true;
if (Tok->is(tok::hash))
return true;
Loc = Lexer::getLocForEndOfToken(Loc, 0, SM, LangOpts).getLocWithOffset(1);
}
return false;
}
llvm::Optional<Token> getQualifyingToken(tok::TokenKind TK,
CharSourceRange Range,
const ASTContext &Context,
const SourceManager &SM) {
assert((TK == tok::kw_const || TK == tok::kw_volatile ||
TK == tok::kw_restrict) &&
"TK is not a qualifier keyword");
std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(Range.getBegin());
StringRef File = SM.getBufferData(LocInfo.first);
Lexer RawLexer(SM.getLocForStartOfFile(LocInfo.first), Context.getLangOpts(),
File.begin(), File.data() + LocInfo.second, File.end());
llvm::Optional<Token> LastMatchBeforeTemplate;
llvm::Optional<Token> LastMatchAfterTemplate;
bool SawTemplate = false;
Token Tok;
while (!RawLexer.LexFromRawLexer(Tok) &&
Range.getEnd() != Tok.getLocation() &&
!SM.isBeforeInTranslationUnit(Range.getEnd(), Tok.getLocation())) {
if (Tok.is(tok::raw_identifier)) {
IdentifierInfo &Info = Context.Idents.get(
StringRef(SM.getCharacterData(Tok.getLocation()), Tok.getLength()));
Tok.setIdentifierInfo(&Info);
Tok.setKind(Info.getTokenID());
}
if (Tok.is(tok::less))
SawTemplate = true;
else if (Tok.isOneOf(tok::greater, tok::greatergreater))
LastMatchAfterTemplate = None;
else if (Tok.is(TK)) {
if (SawTemplate)
LastMatchAfterTemplate = Tok;
else
LastMatchBeforeTemplate = Tok;
}
}
return LastMatchAfterTemplate != None ? LastMatchAfterTemplate
: LastMatchBeforeTemplate;
}
} // namespace lexer
} // namespace utils
} // namespace tidy
} // namespace clang