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annotate gcc/testsuite/gcc.dg/tree-ssa/strncat.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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131
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1 /* PR tree-optimization/83075 - Invalid strncpy optimization */
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2 /* { dg-do run } */
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3 /* { dg-options "-O2 -Wstringop-overflow" } */
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4
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5 typedef __SIZE_TYPE__ size_t;
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6
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7 __attribute__((noipa)) size_t
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8 foo (char *p, char *q, size_t *r)
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9 {
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10 size_t n0 = __builtin_strlen (p);
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11 __builtin_strncat (q, p, n0); /* { dg-warning "specified bound depends on the length" } */
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12 size_t n1 = __builtin_strlen (p);
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13 *r = n0;
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14 return n1;
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15 }
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16
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17 int
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18 main ()
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19 {
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20 char a[8] = "";
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21 __builtin_strcpy (a, "123");
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22 size_t n0 = __builtin_strlen (a);
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23 __builtin_strncat (a + 3, a, n0); /* { dg-warning "specified bound depends on the length" } */
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24 size_t n1 = __builtin_strlen (a);
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25 if (n1 == n0)
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26 __builtin_abort ();
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27 a[6] = '7';
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28 __builtin_strcpy (a, "456");
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29 size_t n2;
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30 if (foo (a, a + 3, &n2) != 6 || n2 != 3)
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31 __builtin_abort ();
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32 if (__builtin_memcmp (a, "456456\0", sizeof "456456\0"))
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33 __builtin_abort ();
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34 return 0;
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35 }