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