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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
//===--- ReservedIdentifierCheck.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 "ReservedIdentifierCheck.h"
#include "../utils/Matchers.h"
#include "../utils/OptionsUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Token.h"
#include <algorithm>
#include <cctype>
// FixItHint
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace bugprone {
static const char DoubleUnderscoreTag[] = "du";
static const char UnderscoreCapitalTag[] = "uc";
static const char GlobalUnderscoreTag[] = "global-under";
static const char NonReservedTag[] = "non-reserved";
static const char Message[] =
"declaration uses identifier '%0', which is %select{a reserved "
"identifier|not a reserved identifier|reserved in the global namespace}1";
static int getMessageSelectIndex(StringRef Tag) {
if (Tag == NonReservedTag)
return 1;
if (Tag == GlobalUnderscoreTag)
return 2;
return 0;
}
ReservedIdentifierCheck::ReservedIdentifierCheck(StringRef Name,
ClangTidyContext *Context)
: RenamerClangTidyCheck(Name, Context),
Invert(Options.get("Invert", false)),
AllowedIdentifiers(utils::options::parseStringList(
Options.get("AllowedIdentifiers", ""))) {}
void ReservedIdentifierCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
RenamerClangTidyCheck::storeOptions(Opts);
Options.store(Opts, "Invert", Invert);
Options.store(Opts, "AllowedIdentifiers",
utils::options::serializeStringList(AllowedIdentifiers));
}
static std::string collapseConsecutive(StringRef Str, char C) {
std::string Result;
std::unique_copy(Str.begin(), Str.end(), std::back_inserter(Result),
[C](char A, char B) { return A == C && B == C; });
return Result;
}
static bool hasReservedDoubleUnderscore(StringRef Name,
const LangOptions &LangOpts) {
if (LangOpts.CPlusPlus)
return Name.contains("__");
return Name.startswith("__");
}
static Optional<std::string>
getDoubleUnderscoreFixup(StringRef Name, const LangOptions &LangOpts) {
if (hasReservedDoubleUnderscore(Name, LangOpts))
return collapseConsecutive(Name, '_');
return None;
}
static bool startsWithUnderscoreCapital(StringRef Name) {
return Name.size() >= 2 && Name[0] == '_' && std::isupper(Name[1]);
}
static Optional<std::string> getUnderscoreCapitalFixup(StringRef Name) {
if (startsWithUnderscoreCapital(Name))
return std::string(Name.drop_front(1));
return None;
}
static bool startsWithUnderscoreInGlobalNamespace(StringRef Name,
bool IsInGlobalNamespace) {
return IsInGlobalNamespace && Name.size() >= 1 && Name[0] == '_';
}
static Optional<std::string>
getUnderscoreGlobalNamespaceFixup(StringRef Name, bool IsInGlobalNamespace) {
if (startsWithUnderscoreInGlobalNamespace(Name, IsInGlobalNamespace))
return std::string(Name.drop_front(1));
return None;
}
static std::string getNonReservedFixup(std::string Name) {
assert(!Name.empty());
if (Name[0] == '_' || std::isupper(Name[0]))
Name.insert(Name.begin(), '_');
else
Name.insert(Name.begin(), 2, '_');
return Name;
}
static Optional<RenamerClangTidyCheck::FailureInfo>
getFailureInfoImpl(StringRef Name, bool IsInGlobalNamespace,
const LangOptions &LangOpts, bool Invert,
ArrayRef<std::string> AllowedIdentifiers) {
assert(!Name.empty());
if (llvm::is_contained(AllowedIdentifiers, Name))
return None;
// TODO: Check for names identical to language keywords, and other names
// specifically reserved by language standards, e.g. C++ 'zombie names' and C
// future library directions
using FailureInfo = RenamerClangTidyCheck::FailureInfo;
if (!Invert) {
Optional<FailureInfo> Info;
auto AppendFailure = [&](StringRef Kind, std::string &&Fixup) {
if (!Info) {
Info = FailureInfo{std::string(Kind), std::move(Fixup)};
} else {
Info->KindName += Kind;
Info->Fixup = std::move(Fixup);
}
};
auto InProgressFixup = [&] {
return Info
.map([](const FailureInfo &Info) { return StringRef(Info.Fixup); })
.getValueOr(Name);
};
if (auto Fixup = getDoubleUnderscoreFixup(InProgressFixup(), LangOpts))
AppendFailure(DoubleUnderscoreTag, std::move(*Fixup));
if (auto Fixup = getUnderscoreCapitalFixup(InProgressFixup()))
AppendFailure(UnderscoreCapitalTag, std::move(*Fixup));
if (auto Fixup = getUnderscoreGlobalNamespaceFixup(InProgressFixup(),
IsInGlobalNamespace))
AppendFailure(GlobalUnderscoreTag, std::move(*Fixup));
return Info;
}
if (!(hasReservedDoubleUnderscore(Name, LangOpts) ||
startsWithUnderscoreCapital(Name) ||
startsWithUnderscoreInGlobalNamespace(Name, IsInGlobalNamespace)))
return FailureInfo{NonReservedTag, getNonReservedFixup(std::string(Name))};
return None;
}
Optional<RenamerClangTidyCheck::FailureInfo>
ReservedIdentifierCheck::getDeclFailureInfo(const NamedDecl *Decl,
const SourceManager &) const {
assert(Decl && Decl->getIdentifier() && !Decl->getName().empty() &&
!Decl->isImplicit() &&
"Decl must be an explicit identifier with a name.");
return getFailureInfoImpl(Decl->getName(),
isa<TranslationUnitDecl>(Decl->getDeclContext()),
getLangOpts(), Invert, AllowedIdentifiers);
}
Optional<RenamerClangTidyCheck::FailureInfo>
ReservedIdentifierCheck::getMacroFailureInfo(const Token &MacroNameTok,
const SourceManager &) const {
return getFailureInfoImpl(MacroNameTok.getIdentifierInfo()->getName(), true,
getLangOpts(), Invert, AllowedIdentifiers);
}
RenamerClangTidyCheck::DiagInfo
ReservedIdentifierCheck::getDiagInfo(const NamingCheckId &ID,
const NamingCheckFailure &Failure) const {
return DiagInfo{Message, [&](DiagnosticBuilder &Diag) {
Diag << ID.second
<< getMessageSelectIndex(Failure.Info.KindName);
}};
}
} // namespace bugprone
} // namespace tidy
} // namespace clang
|
