clang/test/Sema/conditional-expr.c

   1 // RUN: %clang_cc1 -fsyntax-only -Wno-pointer-to-int-cast -verify -pedantic -Wsign-conversion %s
   2 void foo(void) {
   3   *(0 ? (double *)0 : (void *)0) = 0;
   4   // FIXME: GCC doesn't consider the following two statements to be errors.
   5   *(0 ? (double *)0 : (void *)(int *)0) = 0; // expected-error {{incomplete type 'void' is not assignable}}
   6   *(0 ? (double *)0 : (void *)(double *)0) = 0; // expected-error {{incomplete type 'void' is not assignable}}
   7   *(0 ? (double *)0 : (int *)(void *)0) = 0; // expected-error {{incomplete type 'void' is not assignable}} expected-warning {{pointer type mismatch ('double *' and 'int *')}}
   8   *(0 ? (double *)0 : (double *)(void *)0) = 0;
   9   *((void *) 0) = 0; // expected-error {{incomplete type 'void' is not assignable}}
  10   double *dp;
  11   int *ip;
  12   void *vp;
  13
  14   dp = vp;
  15   vp = dp;
  16   ip = dp; // expected-warning {{incompatible pointer types assigning to 'int *' from 'double *'}}
  17   dp = ip; // expected-warning {{incompatible pointer types assigning to 'double *' from 'int *'}}
  18   dp = 0 ? (double *)0 : (void *)0;
  19   vp = 0 ? (double *)0 : (void *)0;
  20   ip = 0 ? (double *)0 : (void *)0; // expected-warning {{incompatible pointer types assigning to 'int *' from 'double *'}}
  21
  22   const int *cip;
  23   vp = (0 ? vp : cip); // expected-warning {{discards qualifiers}}
  24   vp = (0 ? cip : vp); // expected-warning {{discards qualifiers}}
  25
  26   int i = 2;
  27   int (*pf)[2];
  28   int (*pv)[i];
  29   pf = (i ? pf : pv);
  30
  31   enum {xxx,yyy,zzz} e, *ee;
  32   short x;
  33   ee = ee ? &x : ee ? &i : &e; // expected-warning {{pointer type mismatch}}
  34
  35   typedef void *asdf;
  36   *(0 ? (asdf) 0 : &x) = 10;
  37
  38   unsigned long test0 = 5;
  39   test0 = test0 ? (long) test0 : test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
  40   test0 = test0 ? (int) test0 : test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
  41   test0 = test0 ? (short) test0 : test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
  42   test0 = test0 ? test0 : (long) test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}}
  43   test0 = test0 ? test0 : (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
  44   test0 = test0 ? test0 : (short) test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}}
  45   test0 = test0 ? test0 : (long) 10;
  46   test0 = test0 ? test0 : (int) 10;
  47   test0 = test0 ? test0 : (short) 10;
  48   test0 = test0 ? (long) 10 : test0;
  49   test0 = test0 ? (int) 10 : test0;
  50   test0 = test0 ? (short) 10 : test0;
  51
  52   int test1;
  53   enum Enum { EVal };
  54   test0 = test0 ? EVal : test0;
  55   test1 = test0 ? EVal : (int) test0;
  56   test0 = test0 ?
  57                   (unsigned) EVal
  58                 : (int) test0;  // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
  59
  60   test0 = test0 ? EVal : test1; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
  61   test0 = test0 ? test1 : EVal; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}}
  62
  63   const int *const_int;
  64   int *nonconst_int;
  65   *(test0 ? const_int : nonconst_int) = 42; // expected-error {{read-only variable is not assignable}}
  66   *(test0 ? nonconst_int : const_int) = 42; // expected-error {{read-only variable is not assignable}}
  67
  68   // The composite type here should be "int (*)[12]", fine for the sizeof
  69   int (*incomplete)[];
  70   int (*complete)[12];
  71   sizeof(*(test0 ? incomplete : complete)); // expected-warning {{expression result unused}}
  72   sizeof(*(test0 ? complete : incomplete)); // expected-warning {{expression result unused}}
  73
  74   int __attribute__((address_space(2))) *adr2;
  75   int __attribute__((address_space(3))) *adr3;
  76   test0 ? adr2 : adr3; // expected-error{{conditional operator with the second and third operands of type  ('__attribute__((address_space(2))) int *' and '__attribute__((address_space(3))) int *') which are pointers to non-overlapping address spaces}}
  77
  78   // Make sure address-space mask ends up in the result type
  79   (test0 ? (test0 ? adr2 : adr2) : nonconst_int); // expected-error{{conditional operator with the second and third operands of type  ('__attribute__((address_space(2))) int *' and 'int *') which are pointers to non-overlapping address spaces}}
  80 }
  81
  82 int Postgresql(void) {
  83   char x;
  84   return ((((&x) != ((void *) 0)) ? (*(&x) = ((char) 1)) : (void) ((void *) 0)), (unsigned long) ((void *) 0)); // expected-warning {{C99 forbids conditional expressions with only one void side}}
  85 }
  86
  87 #define nil ((void*) 0)
  88
  89 extern int f1(void);
  90
  91 int f0(int a) {
  92   // GCC considers this a warning.
  93   return a ? f1() : nil; // expected-warning {{pointer/integer type mismatch in conditional expression ('int' and 'void *')}} expected-warning {{incompatible pointer to integer conversion returning 'void *' from a function with result type 'int'}}
  94 }
  95
  96 int f2(int x) {
  97   // We can suppress this because the immediate context wants an int.
  98   return (x != 0) ? 0U : x;
  99 }
 100
 101 #define NULL (void*)0
 102
 103 void PR9236(void) {
 104   struct A {int i;} A1;
 105   (void)(1 ? A1 : NULL); // expected-error{{non-pointer operand type 'struct A' incompatible with NULL}}
 106   (void)(1 ? NULL : A1); // expected-error{{non-pointer operand type 'struct A' incompatible with NULL}}
 107   (void)(1 ? 0 : A1); // expected-error{{incompatible operand types}}
 108   (void)(1 ? (void*)0 : A1); // expected-error{{incompatible operand types}}
 109   (void)(1 ? A1: (void*)0); // expected-error{{incompatible operand types}}
 110   (void)(1 ? A1 : (NULL)); // expected-error{{non-pointer operand type 'struct A' incompatible with NULL}}
 111 }
 112