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
214
215
216
217
218
|
// RUN: %clang_cc1 -fobjc-runtime-has-weak -fsyntax-only -fobjc-arc -verify -fblocks %s
// rdar://8843600
void * cvt(id arg) // expected-note{{candidate function not viable: cannot convert argument of incomplete type 'void *' to '__strong id'}}
{
void* voidp_val;
(void)(int*)arg; // expected-error {{cast of an Objective-C pointer to 'int *' is disallowed with ARC}}
(void)(id)arg;
(void)(__autoreleasing id*)arg; // expected-error{{C-style cast from 'id' to '__autoreleasing id *' casts away qualifiers}}
(void)(id*)arg; // expected-error{{C-style cast from 'id' to '__strong id *' casts away qualifiers}}
(void)(__autoreleasing id**)voidp_val;
(void)(void*)voidp_val;
(void)(void**)arg; // expected-error {{cast of an Objective-C pointer to 'void **' is disallowed}}
cvt((void*)arg); // expected-error {{no matching function for call to 'cvt'}}
cvt(0);
(void)(__strong id**)(0);
// FIXME: Diagnostic could be better here.
return arg; // expected-error{{cannot initialize return object of type 'void *' with an lvalue of type '__strong id'}}
}
// rdar://8898937
namespace rdar8898937 {
typedef void (^dispatch_block_t)(void);
void dispatch_once(dispatch_block_t block);
static void _dispatch_once(dispatch_block_t block)
{
dispatch_once(block);
}
}
void static_casts(id arg) {
void* voidp_val;
(void)static_cast<int*>(arg); // expected-error {{cannot cast from type 'id' to pointer type 'int *'}}
(void)static_cast<id>(arg);
(void)static_cast<__autoreleasing id*>(arg); // expected-error{{cannot cast from type 'id' to pointer type '__autoreleasing id *'}}
(void)static_cast<id*>(arg); // expected-error {{cannot cast from type 'id' to pointer type '__strong id *'}}
(void)static_cast<__autoreleasing id**>(voidp_val);
(void)static_cast<void*>(voidp_val);
(void)static_cast<void**>(arg); // expected-error {{cannot cast from type 'id' to pointer type 'void **'}}
(void)static_cast<__strong id**>(0);
__strong id *idp;
(void)static_cast<__autoreleasing id*>(idp); // expected-error{{static_cast from '__strong id *' to '__autoreleasing id *' is not allowed}}
(void)static_cast<__weak id*>(idp); // expected-error{{static_cast from '__strong id *' to '__weak id *' is not allowed}}
}
void test_const_cast(__strong id *sip, __weak id *wip,
const __strong id *csip, __weak const id *cwip) {
// Cannot use const_cast to cast between ownership qualifications or
// add/remove ownership qualifications.
(void)const_cast<__strong id *>(wip); // expected-error{{is not allowed}}
(void)const_cast<__weak id *>(sip); // expected-error{{is not allowed}}
// It's acceptable to cast away constness.
(void)const_cast<__strong id *>(csip);
(void)const_cast<__weak id *>(cwip);
}
void test_reinterpret_cast(__strong id *sip, __weak id *wip,
const __strong id *csip, __weak const id *cwip) {
// Okay to reinterpret_cast to add/remove/change ownership
// qualifications.
(void)reinterpret_cast<__strong id *>(wip);
(void)reinterpret_cast<__weak id *>(sip);
// Not allowed to cast away constness
(void)reinterpret_cast<__strong id *>(csip); // expected-error{{reinterpret_cast from '__strong id const *' to '__strong id *' casts away qualifiers}}
(void)reinterpret_cast<__weak id *>(cwip); // expected-error{{reinterpret_cast from '__weak id const *' to '__weak id *' casts away qualifiers}}
(void)reinterpret_cast<__weak id *>(csip); // expected-error{{reinterpret_cast from '__strong id const *' to '__weak id *' casts away qualifiers}}
(void)reinterpret_cast<__strong id *>(cwip); // expected-error{{reinterpret_cast from '__weak id const *' to '__strong id *' casts away qualifiers}}
}
void test_cstyle_cast(__strong id *sip, __weak id *wip,
const __strong id *csip, __weak const id *cwip) {
// C-style casts aren't allowed to change Objective-C ownership
// qualifiers (beyond what the normal implicit conversion allows).
(void)(__strong id *)wip; // expected-error{{C-style cast from '__weak id *' to '__strong id *' casts away qualifiers}}
(void)(__strong id *)cwip; // expected-error{{C-style cast from '__weak id const *' to '__strong id *' casts away qualifiers}}
(void)(__weak id *)sip; // expected-error{{C-style cast from '__strong id *' to '__weak id *' casts away qualifiers}}
(void)(__weak id *)csip; // expected-error{{C-style cast from '__strong id const *' to '__weak id *' casts away qualifiers}}
(void)(__strong const id *)wip; // expected-error{{C-style cast from '__weak id *' to '__strong id const *' casts away qualifiers}}
(void)(__strong const id *)cwip; // expected-error{{C-style cast from '__weak id const *' to '__strong id const *' casts away qualifiers}}
(void)(__weak const id *)sip; // expected-error{{C-style cast from '__strong id *' to '__weak id const *' casts away qualifiers}}
(void)(__weak const id *)csip; // expected-error{{C-style cast from '__strong id const *' to '__weak id const *' casts away qualifiers}}
(void)(__autoreleasing const id *)wip; // expected-error{{C-style cast from '__weak id *' to '__autoreleasing id const *' casts away qualifiers}}
(void)(__autoreleasing const id *)cwip; // expected-error{{C-style cast from '__weak id const *' to '__autoreleasing id const *' casts away qualifiers}}
(void)(__autoreleasing const id *)sip;
(void)(__autoreleasing const id *)csip;
}
void test_functional_cast(__strong id *sip, __weak id *wip,
__autoreleasing id *aip) {
// Functional casts aren't allowed to change Objective-C ownership
// qualifiers (beyond what the normal implicit conversion allows).
typedef __strong id *strong_id_pointer;
typedef __weak id *weak_id_pointer;
typedef __autoreleasing id *autoreleasing_id_pointer;
typedef const __strong id *const_strong_id_pointer;
typedef const __weak id *const_weak_id_pointer;
typedef const __autoreleasing id *const_autoreleasing_id_pointer;
(void)strong_id_pointer(wip); // expected-error{{functional-style cast from '__weak id *' to 'strong_id_pointer' (aka '__strong id *') casts away qualifiers}}
(void)weak_id_pointer(sip); // expected-error{{functional-style cast from '__strong id *' to 'weak_id_pointer' (aka '__weak id *') casts away qualifiers}}
(void)autoreleasing_id_pointer(sip); // expected-error{{functional-style cast from '__strong id *' to 'autoreleasing_id_pointer' (aka '__autoreleasing id *') casts away qualifiers}}
(void)autoreleasing_id_pointer(wip); // expected-error{{functional-style cast from '__weak id *' to 'autoreleasing_id_pointer' (aka '__autoreleasing id *') casts away qualifiers}}
(void)const_strong_id_pointer(wip); // expected-error{{functional-style cast from '__weak id *' to 'const_strong_id_pointer' (aka 'const __strong id *') casts away qualifiers}}
(void)const_weak_id_pointer(sip); // expected-error{{functional-style cast from '__strong id *' to 'const_weak_id_pointer' (aka 'const __weak id *') casts away qualifiers}}
(void)const_autoreleasing_id_pointer(sip);
(void)const_autoreleasing_id_pointer(aip);
(void)const_autoreleasing_id_pointer(wip); // expected-error{{functional-style cast from '__weak id *' to 'const_autoreleasing_id_pointer' (aka 'const __autoreleasing id *') casts away qualifiers}}
}
void test_unsafe_unretained(__strong id *sip, __weak id *wip,
__autoreleasing id *aip,
__unsafe_unretained id *uip,
const __unsafe_unretained id *cuip) {
uip = sip; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type '__strong id *'}}
uip = wip; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type '__weak id *'}}
uip = aip; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type '__autoreleasing id *'}}
cuip = sip;
cuip = wip; // expected-error{{assigning to '__unsafe_unretained id const *' from incompatible type '__weak id *'}}
cuip = aip;
}
void to_void(__strong id *sip, __weak id *wip,
__autoreleasing id *aip,
__unsafe_unretained id *uip) {
void *vp1 = sip;
void *vp2 = wip;
void *vp3 = aip;
void *vp4 = uip;
(void)(void*)sip;
(void)(void*)wip;
(void)(void*)aip;
(void)(void*)uip;
(void)static_cast<void*>(sip);
(void)static_cast<void*>(wip);
(void)static_cast<void*>(aip);
(void)static_cast<void*>(uip);
(void)reinterpret_cast<void*>(sip);
(void)reinterpret_cast<void*>(wip);
(void)reinterpret_cast<void*>(aip);
(void)reinterpret_cast<void*>(uip);
(void)(void*)&sip;
(void)(void*)&wip;
(void)(void*)&aip;
(void)(void*)&uip;
(void)static_cast<void*>(&sip);
(void)static_cast<void*>(&wip);
(void)static_cast<void*>(&aip);
(void)static_cast<void*>(&uip);
(void)reinterpret_cast<void*>(&sip);
(void)reinterpret_cast<void*>(&wip);
(void)reinterpret_cast<void*>(&aip);
(void)reinterpret_cast<void*>(&uip);
}
void from_void(void *vp) {
__strong id *sip = (__strong id *)vp;
__weak id *wip = (__weak id *)vp;
__autoreleasing id *aip = (__autoreleasing id *)vp;
__unsafe_unretained id *uip = (__unsafe_unretained id *)vp;
__strong id *sip2 = static_cast<__strong id *>(vp);
__weak id *wip2 = static_cast<__weak id *>(vp);
__autoreleasing id *aip2 = static_cast<__autoreleasing id *>(vp);
__unsafe_unretained id *uip2 = static_cast<__unsafe_unretained id *>(vp);
__strong id *sip3 = reinterpret_cast<__strong id *>(vp);
__weak id *wip3 = reinterpret_cast<__weak id *>(vp);
__autoreleasing id *aip3 = reinterpret_cast<__autoreleasing id *>(vp);
__unsafe_unretained id *uip3 = reinterpret_cast<__unsafe_unretained id *>(vp);
__strong id **sipp = (__strong id **)vp;
__weak id **wipp = (__weak id **)vp;
__autoreleasing id **aipp = (__autoreleasing id **)vp;
__unsafe_unretained id **uipp = (__unsafe_unretained id **)vp;
sip = vp; // expected-error{{assigning to '__strong id *' from incompatible type 'void *'}}
wip = vp; // expected-error{{assigning to '__weak id *' from incompatible type 'void *'}}
aip = vp; // expected-error{{assigning to '__autoreleasing id *' from incompatible type 'void *'}}
uip = vp; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type 'void *'}}
}
typedef void (^Block)();
typedef void (^Block_strong)() __strong;
typedef void (^Block_autoreleasing)() __autoreleasing;
@class NSString;
void ownership_transfer_in_cast(void *vp, Block *pblk) {
__strong NSString **sip2 = static_cast<NSString **>(static_cast<__strong id *>(vp));
__strong NSString **&si2pref = static_cast<NSString **&>(sip2);
__weak NSString **wip2 = static_cast<NSString **>(static_cast<__weak id *>(vp));
__autoreleasing id *aip2 = static_cast<id *>(static_cast<__autoreleasing id *>(vp));
__unsafe_unretained id *uip2 = static_cast<id *>(static_cast<__unsafe_unretained id *>(vp));
__strong id *sip3 = reinterpret_cast<id *>(reinterpret_cast<__strong id *>(vp));
__weak id *wip3 = reinterpret_cast<id *>(reinterpret_cast<__weak id *>(vp));
__autoreleasing id *aip3 = reinterpret_cast<id *>(reinterpret_cast<__autoreleasing id *>(vp));
__unsafe_unretained id *uip3 = reinterpret_cast<id *>(reinterpret_cast<__unsafe_unretained id *>(vp));
Block_strong blk_strong1;
Block_strong blk_strong2 = static_cast<Block>(blk_strong1);
Block_autoreleasing *blk_auto = static_cast<Block*>(pblk);
}
// Make sure we don't crash.
void writeback_test(NSString & &) {} // expected-error {{type name declared as a reference to a reference}}
|
