validation/nocast.c

   1 #define __nocast        __attribute__((nocast))
   2 typedef unsigned long __nocast ulong_nc_t;
   3
   4 extern void use_val(ulong_nc_t);
   5 extern void use_ptr(ulong_nc_t *);
   6
   7 /* use address */
   8 static void good_use_address(void)
   9 {
  10         ulong_nc_t t;
  11
  12         use_ptr(&t);
  13 }
  14
  15 static ulong_nc_t *good_ret_address(void)
  16 {
  17         static ulong_nc_t t;
  18
  19         return &t;
  20 }
  21
  22 static ulong_nc_t good_deref(ulong_nc_t *t)
  23 {
  24         return *t;
  25 }
  26
  27 /* assign value */
  28 static ulong_nc_t t;
  29 static ulong_nc_t good_assign_self = t;
  30 static unsigned long good_assign_sametype = t;
  31
  32 /* assign pointer */
  33 static ulong_nc_t *good_ptr = &t;
  34 static ulong_nc_t *bad_ptr_to = 1UL;
  35 static unsigned long *bad_ptr_from = &t;
  36
  37 /* arithmetic operation */
  38 static ulong_nc_t good_arith(ulong_nc_t t, unsigned int n)
  39 {
  40         return t + n;
  41 }
  42
  43 /* implicit cast to other types */
  44 static unsigned long good_ret_samecast(ulong_nc_t t)
  45 {
  46         return t;
  47 }
  48 static unsigned long long bad_ret_biggercast(ulong_nc_t t)
  49 {
  50         return t;
  51 }
  52 static long bad_ret_signcast(ulong_nc_t t)
  53 {
  54         return t;
  55 }
  56 static short bad_ret_smallercast(ulong_nc_t t)
  57 {
  58         return t;
  59 }
  60
  61 static void assign_val(ulong_nc_t t)
  62 {
  63         ulong_nc_t good_c = t;
  64         unsigned long good_ul = t;
  65         unsigned long long bad_ull = t;
  66         long bad_l = t;
  67         short bad_i = t;
  68 }
  69
  70 static void assign_via_ptr(ulong_nc_t *t)
  71 {
  72         ulong_nc_t good_c = *t;
  73         unsigned long good_ul = *t;
  74         unsigned long long bad_ull = *t;
  75         long bad_l = *t;
  76         short bad_i = *t;
  77 }
  78
  79 static void assign_ptr(ulong_nc_t *t)
  80 {
  81         ulong_nc_t *good_same_type = t;
  82         unsigned long *bad_mod = t;
  83         unsigned long long __nocast *bad_size = t;
  84         short __nocast *bad_i = t;
  85         long __nocast *bad_l = t;
  86 }
  87
  88 /* implicit cast to nocast */
  89 static void implicit_assign_to(void)
  90 {
  91         ulong_nc_t t;
  92         unsigned long ul = 1;
  93         unsigned short us = 1;
  94         unsigned long long ull = 1;
  95         long l = 1;
  96
  97         t = ul;         /* implicit to nocast from same type: OK? */
  98         t = us;
  99         t = ull;
 100         t = l;
 101 }
 102
 103 static void bad_implicit_arg_to(void)
 104 {
 105         unsigned long ul = 1;
 106         unsigned short us = 1;
 107         unsigned long long ull = 1;
 108         long l = 1;
 109
 110         use_val(ul);    /* implicit to nocast from same type: OK? */
 111         use_val(us);
 112         use_val(ull);
 113         use_val(l);
 114 }
 115
 116 /* implicit cast from nocast */
 117 static unsigned long good_implicit_ret_ul(ulong_nc_t t)
 118 {
 119         return t;       /* implicit to nocast from same type: OK? */
 120 }
 121
 122 static unsigned short bad_implicit_ret_us(ulong_nc_t t)
 123 {
 124         return t;
 125 }
 126
 127 static unsigned long long bad_implicit_ret_ull(ulong_nc_t t)
 128 {
 129         return t;
 130 }
 131
 132 static long bad_implicit_ret_l(ulong_nc_t t)
 133 {
 134         return t;
 135 }
 136
 137 /* FIXME: explicit cast: should we complain? */
 138 static ulong_nc_t good_samecast(ulong_nc_t v)
 139 {
 140         return (ulong_nc_t) v;
 141 }
 142
 143 static ulong_nc_t bad_tocast(unsigned long v)
 144 {
 145         return (ulong_nc_t) v;
 146 }
 147
 148 static unsigned long bad_fromcast(ulong_nc_t v)
 149 {
 150         return (unsigned long) v;
 151 }
 152
 153 /*
 154  * check-name: nocast.c
 155  *
 156  * check-error-start
 157 nocast.c:34:33: warning: incorrect type in initializer (different base types)
 158 nocast.c:34:33:    expected unsigned long [nocast] [usertype] *static [toplevel] bad_ptr_to
 159 nocast.c:34:33:    got unsigned long
 160 nocast.c:34:33: warning: implicit cast to nocast type
 161 nocast.c:35:39: warning: incorrect type in initializer (different modifiers)
 162 nocast.c:35:39:    expected unsigned long *static [toplevel] bad_ptr_from
 163 nocast.c:35:39:    got unsigned long [nocast] *<noident>
 164 nocast.c:35:39: warning: implicit cast from nocast type
 165 nocast.c:50:16: warning: implicit cast from nocast type
 166 nocast.c:54:16: warning: implicit cast from nocast type
 167 nocast.c:58:16: warning: implicit cast from nocast type
 168 nocast.c:65:38: warning: implicit cast from nocast type
 169 nocast.c:66:22: warning: implicit cast from nocast type
 170 nocast.c:67:23: warning: implicit cast from nocast type
 171 nocast.c:74:38: warning: implicit cast from nocast type
 172 nocast.c:75:22: warning: implicit cast from nocast type
 173 nocast.c:76:23: warning: implicit cast from nocast type
 174 nocast.c:82:34: warning: incorrect type in initializer (different modifiers)
 175 nocast.c:82:34:    expected unsigned long *bad_mod
 176 nocast.c:82:34:    got unsigned long [nocast] [usertype] *t
 177 nocast.c:82:34: warning: implicit cast from nocast type
 178 nocast.c:83:49: warning: incorrect type in initializer (different type sizes)
 179 nocast.c:83:49:    expected unsigned long long [nocast] *bad_size
 180 nocast.c:83:49:    got unsigned long [nocast] [usertype] *t
 181 nocast.c:83:49: warning: implicit cast to/from nocast type
 182 nocast.c:84:33: warning: incorrect type in initializer (different type sizes)
 183 nocast.c:84:33:    expected short [nocast] *bad_i
 184 nocast.c:84:33:    got unsigned long [nocast] [usertype] *t
 185 nocast.c:84:33: warning: implicit cast to/from nocast type
 186 nocast.c:85:32: warning: implicit cast to/from nocast type
 187 nocast.c:98:13: warning: implicit cast to nocast type
 188 nocast.c:99:13: warning: implicit cast to nocast type
 189 nocast.c:100:13: warning: implicit cast to nocast type
 190 nocast.c:111:17: warning: implicit cast to nocast type
 191 nocast.c:112:17: warning: implicit cast to nocast type
 192 nocast.c:113:17: warning: implicit cast to nocast type
 193 nocast.c:124:16: warning: implicit cast from nocast type
 194 nocast.c:129:16: warning: implicit cast from nocast type
 195 nocast.c:134:16: warning: implicit cast from nocast type
 196  * check-error-end
 197  */