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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
// RUN: %check_clang_tidy %s misc-unused-using-decls %t -- -- -fno-delayed-template-parsing -isystem %S/Inputs/
// ----- Definitions -----
template <typename T> class vector {};
namespace n {
class A;
class B;
class C;
class D;
class D { public: static int i; };
template <typename T> class E {};
template <typename T> class F {};
class G { public: static void func() {} };
class H { public: static int i; };
class I {
public:
static int ii;
};
template <typename T> class J {};
class G;
class H;
template <typename T> class K {};
template <template <typename> class S>
class L {};
template <typename T> class M {};
class N {};
template <int T> class P {};
const int Constant = 0;
template <typename T> class Q {};
class Base {
public:
void f();
};
D UsedInstance;
D UnusedInstance;
int UsedFunc() { return 1; }
int UnusedFunc() { return 1; }
template <typename T> int UsedTemplateFunc() { return 1; }
template <typename T> int UnusedTemplateFunc() { return 1; }
template <typename T> int UsedInTemplateFunc() { return 1; }
void OverloadFunc(int);
void OverloadFunc(double);
int FuncUsedByUsingDeclInMacro() { return 1; }
class ostream {
public:
ostream &operator<<(ostream &(*PF)(ostream &));
};
extern ostream cout;
ostream &endl(ostream &os);
enum Color1 { Green };
enum Color2 { Red };
enum Color3 { Yellow };
enum Color4 { Blue };
} // namespace n
#include "unused-using-decls.h"
namespace ns {
template <typename T>
class AA {
T t;
};
template <typename T>
T ff() { T t; return t; }
} // namespace ns
// ----- Using declarations -----
// eol-comments aren't removed (yet)
using n::A; // A
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'A' is unused
// CHECK-MESSAGES: :[[@LINE-2]]:10: note: remove the using
// CHECK-FIXES: {{^}}// A
using n::B;
using n::C;
using n::D;
using n::E; // E
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'E' is unused
// CHECK-FIXES: {{^}}// E
using n::F;
using n::G;
using n::H;
using n::I;
int I::ii = 1;
class Derived : public n::Base {
public:
using Base::f;
};
using n::UsedInstance;
using n::UsedFunc;
using n::UsedTemplateFunc;
using n::UnusedInstance; // UnusedInstance
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'UnusedInstance' is unused
// CHECK-FIXES: {{^}}// UnusedInstance
using n::UnusedFunc; // UnusedFunc
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'UnusedFunc' is unused
// CHECK-FIXES: {{^}}// UnusedFunc
using n::cout;
using n::endl;
using n::UsedInTemplateFunc;
using n::J;
template <typename T> void Callee() {
J<T> j;
UsedInTemplateFunc<T>();
}
using n::OverloadFunc; // OverloadFunc
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'OverloadFunc' is unused
// CHECK-FIXES: {{^}}// OverloadFunc
#define DEFINE_INT(name) \
namespace INT { \
static const int _##name = 1; \
} \
using INT::_##name
DEFINE_INT(test);
#undef DEFIND_INT
#define USING_FUNC \
using n::FuncUsedByUsingDeclInMacro;
USING_FUNC
#undef USING_FUNC
namespace N1 {
// n::G is used in namespace N2.
// Currently, the check doesn't support multiple scopes. All the relevant
// using-decls will be marked as used once we see an usage even the usage is in
// other scope.
using n::G;
}
namespace N2 {
using n::G;
void f(G g);
}
void IgnoreFunctionScope() {
// Using-decls defined in function scope will be ignored.
using n::H;
}
using n::Color1;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Color1' is unused
using n::Green;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Green' is unused
using n::Color2;
using n::Color3;
using n::Blue;
using ns::AA;
using ns::ff;
using n::K;
using n::N;
// FIXME: Currently non-type template arguments are not supported.
using n::Constant;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Constant' is unused
using n::Q;
// ----- Usages -----
void f(B b);
void g() {
vector<C> data;
D::i = 1;
F<int> f;
void (*func)() = &G::func;
int *i = &H::i;
UsedInstance.i;
UsedFunc();
UsedTemplateFunc<int>();
cout << endl;
Color2 color2;
int t1 = Color3::Yellow;
int t2 = Blue;
MyClass a;
int t3 = 0;
a.func1<AA>(&t3);
a.func2<int, ff>(t3);
n::L<K> l;
}
template<class T>
void h(n::M<T>* t) {}
// n::N is used the explicit template instantiation.
template void h(n::M<N>* t);
// Test on Non-type template arguments.
template <int T>
void i(n::P<T>* t) {}
template void i(n::P<Constant>* t);
template <typename T, template <typename> class U> class Bar {};
// We used to report Q unsued, because we only checked the first template
// argument.
Bar<int, Q> *bar;
|
