1// RUN: %clang_cc1 -fsyntax-only -verify %s
2// REQUIRES: LP64
3
4struct A {};
5
6// ----------- const_cast --------------
7
8typedef char c;
9typedef c *cp;
10typedef cp *cpp;
11typedef cpp *cppp;
12typedef cppp &cpppr;
13typedef const cppp &cpppcr;
14typedef const char cc;
15typedef cc *ccp;
16typedef volatile ccp ccvp;
17typedef ccvp *ccvpp;
18typedef const volatile ccvpp ccvpcvp;
19typedef ccvpcvp *ccvpcvpp;
20typedef int iar[100];
21typedef iar &iarr;
22typedef int (*f)(int);
23
24void t_cc()
25{
26  ccvpcvpp var = 0;
27  // Cast away deep consts and volatiles.
28  char ***var2 = (cppp)(var);
29  char ***const &var3 = var2;
30  // Const reference to reference.
31  char ***&var4 = (cpppr)(var3);
32  // Drop reference. Intentionally without qualifier change.
33  char *** var5 = (cppp)(var4);
34  const int ar[100] = {0};
35  // Array decay. Intentionally without qualifier change.
36  int *pi = (int*)(ar);
37  f fp = 0;
38  // Don't misidentify fn** as a function pointer.
39  f *fpp = (f*)(&fp);
40  int const A::* const A::*icapcap = 0;
41  int A::* A::* iapap = (int A::* A::*)(icapcap);
42}
43
44// ----------- static_cast -------------
45
46struct B : public A {};             // Single public base.
47struct C1 : public virtual B {};    // Single virtual base.
48struct C2 : public virtual B {};
49struct D : public C1, public C2 {}; // Diamond
50struct E : private A {};            // Single private base.
51struct F : public C1 {};            // Single path to B with virtual.
52struct G1 : public B {};
53struct G2 : public B {};
54struct H : public G1, public G2 {}; // Ambiguous path to B.
55
56enum Enum { En1, En2 };
57enum Onom { On1, On2 };
58
59struct Co1 { operator int(); };
60struct Co2 { Co2(int); };
61struct Co3 { };
62struct Co4 { Co4(Co3); operator Co3(); };
63
64// Explicit implicits
65void t_529_2()
66{
67  int i = 1;
68  (void)(float)(i);
69  double d = 1.0;
70  (void)(float)(d);
71  (void)(int)(d);
72  (void)(char)(i);
73  (void)(unsigned long)(i);
74  (void)(int)(En1);
75  (void)(double)(En1);
76  (void)(int&)(i);
77  (void)(const int&)(i);
78
79  int ar[1];
80  (void)(const int*)(ar);
81  (void)(void (*)())(t_529_2);
82
83  (void)(void*)(0);
84  (void)(void*)((int*)0);
85  (void)(volatile const void*)((const int*)0);
86  (void)(A*)((B*)0);
87  (void)(A&)(*((B*)0));
88  (void)(const B*)((C1*)0);
89  (void)(B&)(*((C1*)0));
90  (void)(A*)((D*)0);
91  (void)(const A&)(*((D*)0));
92  (void)(int B::*)((int A::*)0);
93  (void)(void (B::*)())((void (A::*)())0);
94  (void)(A*)((E*)0); // C-style cast ignores access control
95  (void)(void*)((const int*)0); // const_cast appended
96
97  (void)(int)(Co1());
98  (void)(Co2)(1);
99  (void)(Co3)((Co4)(Co3()));
100
101  // Bad code below
102  //(void)(A*)((H*)0); // {{static_cast from 'struct H *' to 'struct A *' is not allowed}}
103}
104
105// Anything to void
106void t_529_4()
107{
108  (void)(1);
109  (void)(t_529_4);
110}
111
112// Static downcasts
113void t_529_5_8()
114{
115  (void)(B*)((A*)0);
116  (void)(B&)(*((A*)0));
117  (void)(const G1*)((A*)0);
118  (void)(const G1&)(*((A*)0));
119  (void)(B*)((const A*)0); // const_cast appended
120  (void)(B&)(*((const A*)0)); // const_cast appended
121  (void)(E*)((A*)0); // access control ignored
122  (void)(E&)(*((A*)0)); // access control ignored
123
124  // Bad code below
125
126  (void)(C1*)((A*)0); // expected-error {{cannot cast 'A *' to 'C1 *' via virtual base 'B'}}
127  (void)(C1&)(*((A*)0)); // expected-error {{cannot cast 'A' to 'C1 &' via virtual base 'B'}}
128  (void)(D*)((A*)0); // expected-error {{cannot cast 'A *' to 'D *' via virtual base 'B'}}
129  (void)(D&)(*((A*)0)); // expected-error {{cannot cast 'A' to 'D &' via virtual base 'B'}}
130  (void)(H*)((A*)0); // expected-error {{ambiguous cast from base 'A' to derived 'H':\n    struct A -> struct B -> struct G1 -> struct H\n    struct A -> struct B -> struct G2 -> struct H}}
131  (void)(H&)(*((A*)0)); // expected-error {{ambiguous cast from base 'A' to derived 'H':\n    struct A -> struct B -> struct G1 -> struct H\n    struct A -> struct B -> struct G2 -> struct H}}
132
133  // TODO: Test DR427. This requires user-defined conversions, though.
134}
135
136// Enum conversions
137void t_529_7()
138{
139  (void)(Enum)(1);
140  (void)(Enum)(1.0);
141  (void)(Onom)(En1);
142
143  // Bad code below
144
145  (void)(Enum)((int*)0); // expected-error {{C-style cast from 'int *' to 'Enum' is not allowed}}
146}
147
148// Void pointer to object pointer
149void t_529_10()
150{
151  (void)(int*)((void*)0);
152  (void)(const A*)((void*)0);
153  (void)(int*)((const void*)0); // const_cast appended
154}
155
156// Member pointer upcast.
157void t_529_9()
158{
159  (void)(int A::*)((int B::*)0);
160
161  // Bad code below
162  (void)(int A::*)((int H::*)0); // expected-error {{ambiguous conversion from pointer to member of derived class 'H' to pointer to member of base class 'A':}}
163  (void)(int A::*)((int F::*)0); // expected-error {{conversion from pointer to member of class 'F' to pointer to member of class 'A' via virtual base 'B' is not allowed}}
164}
165
166// -------- reinterpret_cast -----------
167
168enum test { testval = 1 };
169struct structure { int m; };
170typedef void (*fnptr)();
171
172// Test conversion between pointer and integral types, as in p3 and p4.
173void integral_conversion()
174{
175  void *vp = (void*)(testval);
176  long l = (long)(vp);
177  (void)(float*)(l);
178  fnptr fnp = (fnptr)(l);
179  (void)(char)(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
180  (void)(long)(fnp);
181}
182
183void pointer_conversion()
184{
185  int *p1 = 0;
186  float *p2 = (float*)(p1);
187  structure *p3 = (structure*)(p2);
188  typedef int **ppint;
189  ppint *deep = (ppint*)(p3);
190  (void)(fnptr*)(deep);
191}
192
193void constness()
194{
195  int ***const ipppc = 0;
196  int const *icp = (int const*)(ipppc);
197  (void)(int*)(icp); // const_cast appended
198  int const *const **icpcpp = (int const* const**)(ipppc); // const_cast appended
199  int *ip = (int*)(icpcpp);
200  (void)(int const*)(ip);
201  (void)(int const* const* const*)(ipppc);
202}
203
204void fnptrs()
205{
206  typedef int (*fnptr2)(int);
207  fnptr fp = 0;
208  (void)(fnptr2)(fp);
209  void *vp = (void*)(fp);
210  (void)(fnptr)(vp);
211}
212
213void refs()
214{
215  long l = 0;
216  char &c = (char&)(l);
217  // Bad: from rvalue
218  (void)(int&)(&c); // expected-error {{C-style cast from rvalue to reference type 'int &'}}
219}
220
221void memptrs()
222{
223  const int structure::*psi = 0;
224  (void)(const float structure::*)(psi);
225  (void)(int structure::*)(psi); // const_cast appended
226
227  void (structure::*psf)() = 0;
228  (void)(int (structure::*)())(psf);
229
230  (void)(void (structure::*)())(psi); // expected-error-re {{C-style cast from 'const int structure::*' to 'void (structure::*)(){{( __attribute__\(\(thiscall\)\))?}}' is not allowed}}
231  (void)(int structure::*)(psf); // expected-error-re {{C-style cast from 'void (structure::*)(){{( __attribute__\(\(thiscall\)\))?}}' to 'int structure::*' is not allowed}}
232}
233