gcc/testsuite/gcc.dg/attr-alloc_size-10.c

   1 /* Verify that -Walloc-size-greater-than doesn't cause false positives
   2    for anti-ranges.  Note that not all of the statements used to create
   3    anti-ranges below result in the argument being represented as an anti
   4    range.
   5
   6    { dg-do compile }
   7    { dg-options "-O2 -Walloc-size-larger-than=12" } */
   8
   9 #define SCHAR_MAX __SCHAR_MAX__
  10 #define SCHAR_MIN (-SCHAR_MAX - 1)
  11 #define UCHAR_MAX (SCHAR_MAX * 2 + 1)
  12
  13 #define SHRT_MAX  __SHRT_MAX__
  14 #define SHRT_MIN  (-SHRT_MAX - 1)
  15 #define USHRT_MAX (SHRT_MAX * 2 + 1)
  16
  17 #define INT_MAX   __INT_MAX__
  18 #define INT_MIN   (-INT_MAX - 1)
  19 #define UINT_MAX  (INT_MAX * 2U + 1)
  20
  21 #define LONG_MAX __LONG_MAX__
  22 #define LONG_MIN (-LONG_MAX - 1)
  23 #define ULONG_MAX (LONG_MAX * 2LU + 1)
  24
  25 #define PTRDIFF_MAX __PTRDIFF_MAX__
  26 #define PTRDIFF_MIN (-PTRDIFF_MAX - 1)
  27 #define SIZE_MAX    __SIZE_MAX__
  28
  29 typedef __PTRDIFF_TYPE__ ptrdiff_t;
  30 typedef __SIZE_TYPE__    size_t;
  31
  32 #define CONCAT(a, b)  a ## b
  33 #define CAT(a, b)     CONCAT (a, b)
  34
  35 /* Macro to generate a unique function to test the anti-range
  36    ~[MIN, MAX] for type T.  */
  37 #define TEST(T, min, max)                                       \
  38   void* CAT (test_anti_range_, __LINE__)(T n)                   \
  39   {                                                             \
  40     extern void* CAT (alloc_anti_range_, __LINE__)(T)           \
  41       __attribute__ ((alloc_size (1)));                         \
  42     if (min <= n && n <= max)                                   \
  43       n = min - 1;                                              \
  44     return CAT (alloc_anti_range_, __LINE__)(n);                \
  45   } typedef void dummy   /* Require a semicolon.  */
  46
  47
  48 /* Verify the anti-range ~[TYPE_MAX - 1, TYPE_MAX - 1].  */
  49 TEST (signed char, SCHAR_MAX - 1, SCHAR_MAX - 1);
  50 TEST (unsigned char, UCHAR_MAX - 1, UCHAR_MAX - 1);
  51 TEST (short, SHRT_MAX - 1, SHRT_MAX - 1);
  52 TEST (unsigned short, USHRT_MAX - 1, USHRT_MAX - 1);
  53 TEST (int, INT_MAX - 1, INT_MAX - 1);
  54 TEST (unsigned, UINT_MAX - 1, UINT_MAX - 1);
  55 TEST (long, LONG_MAX - 1, LONG_MAX - 1);
  56 TEST (unsigned long, ULONG_MAX - 1, ULONG_MAX - 1);
  57 TEST (ptrdiff_t, PTRDIFF_MAX - 1, PTRDIFF_MAX - 1);
  58 TEST (size_t, SIZE_MAX - 1, SIZE_MAX - 1);
  59
  60 /* Verify ~[0, 0].  */
  61 TEST (signed char, 0, 0);
  62 TEST (unsigned char, 0, 0);
  63 TEST (short, 0, 0);
  64 TEST (unsigned short, 0, 0);
  65 TEST (int, 0, 0);
  66 TEST (unsigned, 0, 0);
  67 TEST (long, 0, 0);
  68 TEST (unsigned long, 0, 0);
  69 TEST (ptrdiff_t, 0, 0);
  70 TEST (size_t, 0, 0);
  71
  72 /* Verify ~[1, 1].  */
  73 TEST (signed char, 1, 1);
  74 TEST (unsigned char, 1, 1);
  75 TEST (short, 1, 1);
  76 TEST (unsigned short, 1, 1);
  77 TEST (int, 1, 1);
  78 TEST (unsigned, 1, 1);
  79 TEST (long, 1, 1);
  80 TEST (unsigned long, 1, 1);
  81 TEST (ptrdiff_t, 1, 1);
  82 TEST (size_t, 1, 1);
  83
  84
  85 /* Verify ~[TYPE_MAX - 2, TYPE_MAX - 1].  */
  86 TEST (signed char, SCHAR_MAX - 2, SCHAR_MAX - 1);
  87 TEST (unsigned char, UCHAR_MAX - 2, UCHAR_MAX - 1);
  88 TEST (short, SHRT_MAX - 2, SHRT_MAX - 1);
  89 TEST (unsigned short, USHRT_MAX - 2, USHRT_MAX - 1);
  90 TEST (int, INT_MAX - 2, INT_MAX - 1);
  91 TEST (unsigned, UINT_MAX - 2, UINT_MAX - 1);
  92 TEST (long, LONG_MAX - 2, LONG_MAX - 1);
  93 TEST (unsigned long, ULONG_MAX - 2, ULONG_MAX - 1);
  94 TEST (ptrdiff_t, PTRDIFF_MAX - 2, PTRDIFF_MAX - 1);
  95 TEST (size_t, SIZE_MAX - 2, SIZE_MAX - 1);
  96
  97 /* Verify ~[0, 2].  */
  98 TEST (signed char, 0, 2);
  99 TEST (unsigned char, 0, 2);
 100 TEST (short, 0, 2);
 101 TEST (unsigned short, 0, 2);
 102 TEST (int, 0, 2);
 103 TEST (unsigned int, 0, 2);
 104 TEST (long, 0, 2);
 105 TEST (unsigned long, 0, 2);
 106 TEST (ptrdiff_t, 0, 2);
 107 TEST (size_t, 0, 2);
 108
 109 /* Verify the signed anti-range ~[TYPE_MIN - 2, -1].  */
 110 TEST (signed char, SCHAR_MIN + 2, -1);
 111 TEST (short, SHRT_MIN + 2, -1);
 112 TEST (int, INT_MIN + 2, -1);
 113 TEST (long, LONG_MIN + 2, -1);
 114 TEST (ptrdiff_t, PTRDIFF_MIN + 2, -1);
 115
 116 /* Verify the signed anti-range ~[TYPE_MIN - 2, 0].  */
 117 TEST (signed char, SCHAR_MIN + 2, 0);
 118 TEST (short, SHRT_MIN + 2, 0);
 119 TEST (int, INT_MIN + 2, 0);
 120 TEST (long, LONG_MIN + 2, 0);
 121 TEST (ptrdiff_t, PTRDIFF_MIN + 2, 0);
 122
 123 /* Verify the signed anti-range ~[TYPE_MIN - 2, 1].  */
 124 TEST (signed char, SCHAR_MIN + 2, 1);
 125 TEST (short, SHRT_MIN + 2, 1);
 126 TEST (int, INT_MIN + 2, 1);
 127 TEST (long, LONG_MIN + 2, 1);
 128 TEST (ptrdiff_t, PTRDIFF_MIN + 2, 1);
 129
 130 /* Verify the signed anti-range ~[TYPE_MIN - 2, 2].  */
 131 TEST (signed char, SCHAR_MIN + 2, 2);
 132 TEST (short, SHRT_MIN + 2, 2);
 133 TEST (int, INT_MIN + 2, 2);
 134 TEST (long, LONG_MIN + 2, 2);
 135 TEST (ptrdiff_t, PTRDIFF_MIN + 2, 2);
 136
 137 /* Verify the signed anti-range ~[-1, 2].  */
 138 TEST (signed char, -1, 2);
 139 TEST (short, -1, 2);
 140 TEST (int, -1, 2);
 141 TEST (long, -1, 2);
 142 TEST (ptrdiff_t, 01, 2);