arc-type-conversion.mm revision 5acb0c98b363400f6ade0ae7250f0102224e806b
1// RUN: %clang_cc1 -fobjc-runtime-has-weak -fsyntax-only -fobjc-arc -verify -fblocks %s
2// rdar://8843600
3
4void * cvt(id arg) // expected-note{{candidate function not viable: cannot convert argument of incomplete type 'void *' to '__strong id'}}
5{
6  void* voidp_val;
7  (void)(int*)arg; // expected-error {{cast of an Objective-C pointer to 'int *' is disallowed with ARC}}
8  (void)(id)arg;
9  (void)(__autoreleasing id*)arg; // expected-error{{C-style cast from 'id' to '__autoreleasing id *' casts away qualifiers}}
10  (void)(id*)arg; // expected-error{{C-style cast from 'id' to '__strong id *' casts away qualifiers}}
11
12  (void)(__autoreleasing id**)voidp_val;
13  (void)(void*)voidp_val;
14  (void)(void**)arg; // expected-error {{cast of an Objective-C pointer to 'void **' is disallowed}}
15  cvt((void*)arg); // expected-error {{no matching function for call to 'cvt'}}
16  cvt(0);
17  (void)(__strong id**)(0);
18
19  // FIXME: Diagnostic could be better here.
20  return arg; // expected-error{{cannot initialize return object of type 'void *' with an lvalue of type '__strong id'}}
21}
22
23// rdar://8898937
24namespace rdar8898937 {
25
26typedef void (^dispatch_block_t)(void);
27
28void dispatch_once(dispatch_block_t block);
29static void _dispatch_once(dispatch_block_t block)
30{
31  dispatch_once(block);
32}
33
34}
35
36void static_casts(id arg) {
37  void* voidp_val;
38  (void)static_cast<int*>(arg); // expected-error {{cannot cast from type 'id' to pointer type 'int *'}}
39  (void)static_cast<id>(arg);
40  (void)static_cast<__autoreleasing id*>(arg); // expected-error{{cannot cast from type 'id' to pointer type '__autoreleasing id *'}}
41  (void)static_cast<id*>(arg); // expected-error {{cannot cast from type 'id' to pointer type '__strong id *'}}
42
43  (void)static_cast<__autoreleasing id**>(voidp_val);
44  (void)static_cast<void*>(voidp_val);
45  (void)static_cast<void**>(arg); // expected-error {{cannot cast from type 'id' to pointer type 'void **'}}
46  (void)static_cast<__strong id**>(0);  
47
48  __strong id *idp;
49  (void)static_cast<__autoreleasing id*>(idp); // expected-error{{static_cast from '__strong id *' to '__autoreleasing id *' is not allowed}}
50  (void)static_cast<__weak id*>(idp); // expected-error{{static_cast from '__strong id *' to '__weak id *' is not allowed}}
51}
52
53void test_const_cast(__strong id *sip, __weak id *wip, 
54                     const __strong id *csip, __weak const id *cwip) {
55  // Cannot use const_cast to cast between ownership qualifications or
56  // add/remove ownership qualifications.
57  (void)const_cast<__strong id *>(wip); // expected-error{{is not allowed}}
58  (void)const_cast<__weak id *>(sip); // expected-error{{is not allowed}}
59
60  // It's acceptable to cast away constness.
61  (void)const_cast<__strong id *>(csip);
62  (void)const_cast<__weak id *>(cwip);
63}
64
65void test_reinterpret_cast(__strong id *sip, __weak id *wip, 
66                           const __strong id *csip, __weak const id *cwip) {
67  // Okay to reinterpret_cast to add/remove/change ownership
68  // qualifications.
69  (void)reinterpret_cast<__strong id *>(wip);
70  (void)reinterpret_cast<__weak id *>(sip);
71
72  // Not allowed to cast away constness
73  (void)reinterpret_cast<__strong id *>(csip); // expected-error{{reinterpret_cast from '__strong id const *' to '__strong id *' casts away qualifiers}}
74  (void)reinterpret_cast<__weak id *>(cwip); // expected-error{{reinterpret_cast from '__weak id const *' to '__weak id *' casts away qualifiers}}
75  (void)reinterpret_cast<__weak id *>(csip); // expected-error{{reinterpret_cast from '__strong id const *' to '__weak id *' casts away qualifiers}}
76  (void)reinterpret_cast<__strong id *>(cwip); // expected-error{{reinterpret_cast from '__weak id const *' to '__strong id *' casts away qualifiers}}
77}
78
79void test_cstyle_cast(__strong id *sip, __weak id *wip, 
80                      const __strong id *csip, __weak const id *cwip) {
81  // C-style casts aren't allowed to change Objective-C ownership
82  // qualifiers (beyond what the normal implicit conversion allows).
83
84  (void)(__strong id *)wip; // expected-error{{C-style cast from '__weak id *' to '__strong id *' casts away qualifiers}}
85  (void)(__strong id *)cwip; // expected-error{{C-style cast from '__weak id const *' to '__strong id *' casts away qualifiers}}
86  (void)(__weak id *)sip; // expected-error{{C-style cast from '__strong id *' to '__weak id *' casts away qualifiers}}
87  (void)(__weak id *)csip; // expected-error{{C-style cast from '__strong id const *' to '__weak id *' casts away qualifiers}}
88
89  (void)(__strong const id *)wip; // expected-error{{C-style cast from '__weak id *' to '__strong id const *' casts away qualifiers}}
90  (void)(__strong const id *)cwip; // expected-error{{C-style cast from '__weak id const *' to '__strong id const *' casts away qualifiers}}
91  (void)(__weak const id *)sip; // expected-error{{C-style cast from '__strong id *' to '__weak id const *' casts away qualifiers}}
92  (void)(__weak const id *)csip; // expected-error{{C-style cast from '__strong id const *' to '__weak id const *' casts away qualifiers}}
93  (void)(__autoreleasing const id *)wip; // expected-error{{C-style cast from '__weak id *' to '__autoreleasing id const *' casts away qualifiers}}
94  (void)(__autoreleasing const id *)cwip; // expected-error{{C-style cast from '__weak id const *' to '__autoreleasing id const *' casts away qualifiers}}
95  (void)(__autoreleasing const id *)sip;
96  (void)(__autoreleasing const id *)csip;
97}
98
99void test_functional_cast(__strong id *sip, __weak id *wip,
100                          __autoreleasing id *aip) {
101  // Functional casts aren't allowed to change Objective-C ownership
102  // qualifiers (beyond what the normal implicit conversion allows).
103
104  typedef __strong id *strong_id_pointer;
105  typedef __weak id *weak_id_pointer;
106  typedef __autoreleasing id *autoreleasing_id_pointer;
107
108  typedef const __strong id *const_strong_id_pointer;
109  typedef const __weak id *const_weak_id_pointer;
110  typedef const __autoreleasing id *const_autoreleasing_id_pointer;
111
112  (void)strong_id_pointer(wip); // expected-error{{functional-style cast from '__weak id *' to 'strong_id_pointer' (aka '__strong id *') casts away qualifiers}}
113  (void)weak_id_pointer(sip); // expected-error{{functional-style cast from '__strong id *' to 'weak_id_pointer' (aka '__weak id *') casts away qualifiers}}
114  (void)autoreleasing_id_pointer(sip); // expected-error{{functional-style cast from '__strong id *' to 'autoreleasing_id_pointer' (aka '__autoreleasing id *') casts away qualifiers}}
115  (void)autoreleasing_id_pointer(wip); // expected-error{{functional-style cast from '__weak id *' to 'autoreleasing_id_pointer' (aka '__autoreleasing id *') casts away qualifiers}}
116  (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}}
117  (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}}
118  (void)const_autoreleasing_id_pointer(sip);
119  (void)const_autoreleasing_id_pointer(aip);
120  (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}}
121}
122
123void test_unsafe_unretained(__strong id *sip, __weak id *wip,
124                            __autoreleasing id *aip,
125                            __unsafe_unretained id *uip,
126                            const __unsafe_unretained id *cuip) {
127  uip = sip; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type '__strong id *'}}
128  uip = wip; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type '__weak id *'}}
129  uip = aip; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type '__autoreleasing id *'}}
130
131  cuip = sip;
132  cuip = wip; // expected-error{{assigning to '__unsafe_unretained id const *' from incompatible type '__weak id *'}}
133  cuip = aip;
134}
135
136void to_void(__strong id *sip, __weak id *wip,
137             __autoreleasing id *aip,
138             __unsafe_unretained id *uip) {
139  void *vp1 = sip;
140  void *vp2 = wip;
141  void *vp3 = aip;
142  void *vp4 = uip;
143  (void)(void*)sip;
144  (void)(void*)wip;
145  (void)(void*)aip;
146  (void)(void*)uip;
147  (void)static_cast<void*>(sip);
148  (void)static_cast<void*>(wip);
149  (void)static_cast<void*>(aip);
150  (void)static_cast<void*>(uip);
151  (void)reinterpret_cast<void*>(sip);
152  (void)reinterpret_cast<void*>(wip);
153  (void)reinterpret_cast<void*>(aip);
154  (void)reinterpret_cast<void*>(uip);
155
156  (void)(void*)&sip;
157  (void)(void*)&wip;
158  (void)(void*)&aip;
159  (void)(void*)&uip;
160  (void)static_cast<void*>(&sip);
161  (void)static_cast<void*>(&wip);
162  (void)static_cast<void*>(&aip);
163  (void)static_cast<void*>(&uip);
164  (void)reinterpret_cast<void*>(&sip);
165  (void)reinterpret_cast<void*>(&wip);
166  (void)reinterpret_cast<void*>(&aip);
167  (void)reinterpret_cast<void*>(&uip);
168}
169
170void from_void(void *vp) {
171  __strong id *sip = (__strong id *)vp;
172  __weak id *wip = (__weak id *)vp;
173  __autoreleasing id *aip = (__autoreleasing id *)vp;
174  __unsafe_unretained id *uip = (__unsafe_unretained id *)vp;
175  __strong id *sip2 = static_cast<__strong id *>(vp);
176  __weak id *wip2 = static_cast<__weak id *>(vp);
177  __autoreleasing id *aip2 = static_cast<__autoreleasing id *>(vp);
178  __unsafe_unretained id *uip2 = static_cast<__unsafe_unretained id *>(vp);
179  __strong id *sip3 = reinterpret_cast<__strong id *>(vp);
180  __weak id *wip3 = reinterpret_cast<__weak id *>(vp);
181  __autoreleasing id *aip3 = reinterpret_cast<__autoreleasing id *>(vp);
182  __unsafe_unretained id *uip3 = reinterpret_cast<__unsafe_unretained id *>(vp);
183
184  __strong id **sipp = (__strong id **)vp;
185  __weak id **wipp = (__weak id **)vp;
186  __autoreleasing id **aipp = (__autoreleasing id **)vp;
187  __unsafe_unretained id **uipp = (__unsafe_unretained id **)vp;
188
189  sip = vp; // expected-error{{assigning to '__strong id *' from incompatible type 'void *'}}
190  wip = vp; // expected-error{{assigning to '__weak id *' from incompatible type 'void *'}}
191  aip = vp; // expected-error{{assigning to '__autoreleasing id *' from incompatible type 'void *'}}
192  uip = vp; // expected-error{{assigning to '__unsafe_unretained id *' from incompatible type 'void *'}}
193}
194
195typedef void (^Block)();
196typedef void (^Block_strong)() __strong;
197typedef void (^Block_autoreleasing)() __autoreleasing;
198
199@class NSString;
200
201void ownership_transfer_in_cast(void *vp, Block *pblk) {
202  __strong NSString **sip2 = static_cast<NSString **>(static_cast<__strong id *>(vp));
203  __strong NSString **&si2pref = static_cast<NSString **&>(sip2);
204  __weak NSString **wip2 = static_cast<NSString **>(static_cast<__weak id *>(vp));
205  __autoreleasing id *aip2 = static_cast<id *>(static_cast<__autoreleasing id *>(vp));
206  __unsafe_unretained id *uip2 = static_cast<id *>(static_cast<__unsafe_unretained id *>(vp));
207  __strong id *sip3 = reinterpret_cast<id *>(reinterpret_cast<__strong id *>(vp));
208  __weak id *wip3 = reinterpret_cast<id *>(reinterpret_cast<__weak id *>(vp));
209  __autoreleasing id *aip3 = reinterpret_cast<id *>(reinterpret_cast<__autoreleasing id *>(vp));
210  __unsafe_unretained id *uip3 = reinterpret_cast<id *>(reinterpret_cast<__unsafe_unretained id *>(vp));
211
212  Block_strong blk_strong1;
213  Block_strong blk_strong2 = static_cast<Block>(blk_strong1);
214  Block_autoreleasing *blk_auto = static_cast<Block*>(pblk);
215}
216
217// Make sure we don't crash.
218void writeback_test(NSString & &) {} // expected-error {{type name declared as a reference to a reference}}
219