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1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2 // REQUIRES: LP64
3 
4 // ------------ not interpreted as C-style cast ------------
5 
6 struct SimpleValueInit {
7   int i;
8 };
9 
10 struct InitViaConstructor {
11   InitViaConstructor(int i = 7);
12 };
13 
14 struct NoValueInit { // expected-note 2 {{candidate constructor (the implicit copy constructor)}} expected-note 2 {{candidate constructor (the implicit move constructor)}}
15   NoValueInit(int i, int j); // expected-note 2 {{candidate constructor}}
16 };
17 
test_cxx_functional_value_init()18 void test_cxx_functional_value_init() {
19   (void)SimpleValueInit();
20   (void)InitViaConstructor();
21   (void)NoValueInit(); // expected-error{{no matching constructor for initialization}}
22 }
23 
test_cxx_function_cast_multi()24 void test_cxx_function_cast_multi() {
25   (void)NoValueInit(0, 0);
26   (void)NoValueInit(0, 0, 0); // expected-error{{no matching constructor for initialization}}
27   (void)int(1, 2); // expected-error{{excess elements in scalar initializer}}
28   (void)int({}, 2);           // expected-error{{excess elements in scalar initializer}}
29 }
30 
31 
32 // ------------------ everything else --------------------
33 
34 struct A {};
35 
36 // ----------- const_cast --------------
37 
38 typedef char c;
39 typedef c *cp;
40 typedef cp *cpp;
41 typedef cpp *cppp;
42 typedef cppp &cpppr;
43 typedef const cppp &cpppcr;
44 typedef const char cc;
45 typedef cc *ccp;
46 typedef volatile ccp ccvp;
47 typedef ccvp *ccvpp;
48 typedef const volatile ccvpp ccvpcvp;
49 typedef ccvpcvp *ccvpcvpp;
50 typedef int iar[100];
51 typedef iar &iarr;
52 typedef int (*f)(int);
53 
t_cc()54 void t_cc()
55 {
56   ccvpcvpp var = 0;
57   // Cast away deep consts and volatiles.
58   char ***var2 = cppp(var);
59   char ***const &var3 = var2;
60   // Const reference to reference.
61   char ***&var4 = cpppr(var3);
62   // Drop reference. Intentionally without qualifier change.
63   char *** var5 = cppp(var4);
64   const int ar[100] = {0};
65   // Array decay. Intentionally without qualifier change.
66   typedef int *intp;
67   int *pi = intp(ar);
68   f fp = 0;
69   // Don't misidentify fn** as a function pointer.
70   typedef f *fp_t;
71   f *fpp = fp_t(&fp);
72   int const A::* const A::*icapcap = 0;
73   typedef int A::* A::*iapap_t;
74   iapap_t iapap = iapap_t(icapcap);
75 }
76 
77 // ----------- static_cast -------------
78 
79 struct B : public A {};             // Single public base.
80 struct C1 : public virtual B {};    // Single virtual base.
81 struct C2 : public virtual B {};
82 struct D : public C1, public C2 {}; // Diamond
83 struct E : private A {};            // Single private base.
84 struct F : public C1 {};            // Single path to B with virtual.
85 struct G1 : public B {};
86 struct G2 : public B {};
87 struct H : public G1, public G2 {}; // Ambiguous path to B.
88 
89 enum Enum { En1, En2 };
90 enum Onom { On1, On2 };
91 
92 struct Co1 { operator int(); };
93 struct Co2 { Co2(int); };
94 struct Co3 { };
95 struct Co4 { Co4(Co3); operator Co3(); };
96 
97 // Explicit implicits
t_529_2()98 void t_529_2()
99 {
100   int i = 1;
101   (void)float(i);
102   double d = 1.0;
103   (void)float(d);
104   (void)int(d);
105   (void)char(i);
106   typedef unsigned long ulong;
107   (void)ulong(i);
108   (void)int(En1);
109   (void)double(En1);
110   typedef int &intr;
111   (void)intr(i);
112   typedef const int &cintr;
113   (void)cintr(i);
114 
115   int ar[1];
116   typedef const int *cintp;
117   (void)cintp(ar);
118   typedef void (*pfvv)();
119   (void)pfvv(t_529_2);
120 
121   typedef void *voidp;
122   (void)voidp(0);
123   (void)voidp((int*)0);
124   typedef volatile const void *vcvoidp;
125   (void)vcvoidp((const int*)0);
126   typedef A *Ap;
127   (void)Ap((B*)0);
128   typedef A &Ar;
129   (void)Ar(*((B*)0)); // expected-warning {{binding dereferenced null pointer to reference has undefined behavior}}
130   typedef const B *cBp;
131   (void)cBp((C1*)0);
132   typedef B &Br;
133   (void)Br(*((C1*)0)); // expected-warning {{binding dereferenced null pointer to reference has undefined behavior}}
134   (void)Ap((D*)0);
135   typedef const A &cAr;
136   (void)cAr(*((D*)0)); // expected-warning {{binding dereferenced null pointer to reference has undefined behavior}}
137   typedef int B::*Bmp;
138   (void)Bmp((int A::*)0);
139   typedef void (B::*Bmfp)();
140   (void)Bmfp((void (A::*)())0);
141   (void)Ap((E*)0); // functional-style cast ignores access control
142   (void)voidp((const int*)0); // const_cast appended
143 
144   (void)int(Co1());
145   (void)Co2(1);
146   (void)Co3((Co4)(Co3()));
147 
148   // Bad code below
149   //(void)(A*)((H*)0); // {{static_cast from 'struct H *' to 'struct A *' is not allowed}}
150 }
151 
152 // Anything to void
t_529_4()153 void t_529_4()
154 {
155   void(1);
156   (void(t_529_4));
157 }
158 
159 // Static downcasts
t_529_5_8()160 void t_529_5_8()
161 {
162   typedef B *Bp;
163   (void)Bp((A*)0);
164   typedef B &Br;
165   (void)Br(*((A*)0));
166   typedef const G1 *cG1p;
167   (void)cG1p((A*)0);
168   typedef const G1 &cG1r;
169   (void)cG1r(*((A*)0));
170   (void)Bp((const A*)0); // const_cast appended
171   (void)Br(*((const A*)0)); // const_cast appended
172   typedef E *Ep;
173   (void)Ep((A*)0); // access control ignored
174   typedef E &Er;
175   (void)Er(*((A*)0)); // access control ignored
176 
177   // Bad code below
178 
179   typedef C1 *C1p;
180   (void)C1p((A*)0); // expected-error {{cannot cast 'A *' to 'C1p' (aka 'C1 *') via virtual base 'B'}}
181   typedef C1 &C1r;
182   (void)C1r(*((A*)0)); // expected-error {{cannot cast 'A' to 'C1r' (aka 'C1 &') via virtual base 'B'}}
183   typedef D *Dp;
184   (void)Dp((A*)0); // expected-error {{cannot cast 'A *' to 'Dp' (aka 'D *') via virtual base 'B'}}
185   typedef D &Dr;
186   (void)Dr(*((A*)0)); // expected-error {{cannot cast 'A' to 'Dr' (aka 'D &') via virtual base 'B'}}
187   typedef H *Hp;
188   (void)Hp((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}}
189   typedef H &Hr;
190   (void)Hr(*((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}}
191 
192   // TODO: Test DR427. This requires user-defined conversions, though.
193 }
194 
195 // Enum conversions
t_529_7()196 void t_529_7()
197 {
198   (void)Enum(1);
199   (void)Enum(1.0);
200   (void)Onom(En1);
201 
202   // Bad code below
203 
204   (void)Enum((int*)0); // expected-error {{functional-style cast from 'int *' to 'Enum' is not allowed}}
205 }
206 
207 // Void pointer to object pointer
t_529_10()208 void t_529_10()
209 {
210   typedef int *intp;
211   (void)intp((void*)0);
212   typedef const A *cAp;
213   (void)cAp((void*)0);
214   (void)intp((const void*)0); // const_cast appended
215 }
216 
217 // Member pointer upcast.
t_529_9()218 void t_529_9()
219 {
220   typedef int A::*Amp;
221   (void)Amp((int B::*)0);
222 
223   // Bad code below
224   (void)Amp((int H::*)0); // expected-error {{ambiguous conversion from pointer to member of derived class 'H' to pointer to member of base class 'A':}}
225   (void)Amp((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}}
226 }
227 
228 // -------- reinterpret_cast -----------
229 
230 enum test { testval = 1 };
231 struct structure { int m; };
232 typedef void (*fnptr)();
233 
234 // Test conversion between pointer and integral types, as in p3 and p4.
integral_conversion()235 void integral_conversion()
236 {
237   typedef void *voidp;
238   void *vp = voidp(testval);
239   long l = long(vp);
240   typedef float *floatp;
241   (void)floatp(l);
242   fnptr fnp = fnptr(l);
243   (void)char(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
244   (void)long(fnp);
245 }
246 
pointer_conversion()247 void pointer_conversion()
248 {
249   int *p1 = 0;
250   typedef float *floatp;
251   float *p2 = floatp(p1);
252   typedef structure *structurep;
253   structure *p3 = structurep(p2);
254   typedef int **ppint;
255   typedef ppint *pppint;
256   ppint *deep = pppint(p3);
257   typedef fnptr fnptrp;
258   (void)fnptrp(deep);
259 }
260 
constness()261 void constness()
262 {
263   int ***const ipppc = 0;
264   typedef int const *icp_t;
265   int const *icp = icp_t(ipppc);
266   typedef int *intp;
267   (void)intp(icp); // const_cast appended
268   typedef int const *const ** intcpcpp;
269   intcpcpp icpcpp = intcpcpp(ipppc); // const_cast appended
270   int *ip = intp(icpcpp);
271   (void)icp_t(ip);
272   typedef int const *const *const *intcpcpcp;
273   (void)intcpcpcp(ipppc);
274 }
275 
fnptrs()276 void fnptrs()
277 {
278   typedef int (*fnptr2)(int);
279   fnptr fp = 0;
280   (void)fnptr2(fp);
281   typedef void *voidp;
282   void *vp = voidp(fp);
283   (void)fnptr(vp);
284 }
285 
refs()286 void refs()
287 {
288   long l = 0;
289   typedef char &charr;
290   char &c = charr(l);
291   // Bad: from rvalue
292   typedef int &intr;
293   (void)intr(&c); // expected-error {{functional-style cast from rvalue to reference type 'intr' (aka 'int &')}}
294 }
295 
memptrs()296 void memptrs()
297 {
298   const int structure::*psi = 0;
299   typedef const float structure::*structurecfmp;
300   (void)structurecfmp(psi);
301   typedef int structure::*structureimp;
302   (void)structureimp(psi); // const_cast appended
303 
304   void (structure::*psf)() = 0;
305   typedef int (structure::*structureimfp)();
306   (void)structureimfp(psf);
307 
308   typedef void (structure::*structurevmfp)();
309   (void)structurevmfp(psi); // expected-error-re {{functional-style cast from 'const int structure::*' to 'structurevmfp' (aka 'void (structure::*)(){{( __attribute__\(\(thiscall\)\))?}}') is not allowed}}
310   (void)structureimp(psf); // expected-error-re {{functional-style cast from 'void (structure::*)(){{( __attribute__\(\(thiscall\)\))?}}' to 'structureimp' (aka 'int structure::*') is not allowed}}
311 }
312 
313 // ---------------- misc ------------------
314 
crash_on_invalid_1()315 void crash_on_invalid_1()
316 {
317   typedef itn Typo; // expected-error {{unknown type name 'itn'}}
318   (void)Typo(1); // used to crash
319 
320   typedef int &int_ref;
321   (void)int_ref(); // expected-error {{reference to type 'int' requires an initializer}}
322 }
323