gcc/testsuite/gcc.dg/Warray-bounds-27.c

   1 /* { dg-do compile }
   2    { dg-options "-O2 -Wall -Wextra -Warray-bounds -Wrestrict" } */
   3
   4 typedef __SIZE_TYPE__ size_t;
   5
   6 extern void* memcpy (void* restrict, const void* restrict, size_t);
   7
   8 extern void sink (void*, ...);
   9
  10 struct Data {
  11   size_t n;
  12   void *p;
  13 };
  14
  15 void test_copy (void)
  16 {
  17   struct Data d;
  18   sink (&d);
  19
  20   char dp1[sizeof d + 1];
  21   char d2x[2 * sizeof d];
  22   char d2xp1[2 * sizeof d + 1];
  23
  24   /* During development the following would incorrectly trigger:
  25      warning: 'memcpy' forming offset [17, 25] is out of the bounds [0, 16]
  26               of object ‘d’ with type 'struct Data' [-Warray-bounds]
  27      that wasn't caught by the test suite.  Make sure it is.  */
  28   memcpy (&dp1, d.p, sizeof dp1);       /* { dg-bogus "\\\[-Warray-bounds" } */
  29
  30   /* Likewise.  */
  31   memcpy (&d2x, d.p, sizeof d2x);       /* { dg-bogus "\\\[-Warray-bounds" } */
  32   memcpy (&d2xp1, d.p, sizeof d2xp1);   /* { dg-bogus "\\\[-Warray-bounds" } */
  33
  34   sink (&d, &dp1, &d2x, &d2xp1);
  35 }