tests/os_unaligned.c

   1 #include <stdint.h>
   2 #include <darwintest.h>
   3 #include <darwintest_utils.h>
   4
   5 #include "../libkern/os/ptrtools.h"
   6
   7 #define CHECK_ALIGNMENT(T) \
   8 { \
   9         T *__p; \
  10         T_QUIET; T_EXPECT_EQ_ULONG(__alignof__(*__p), sizeof(*__p), #T " native alignment"); \
  11         T_ASSERT_EQ_ULONG(__alignof__(os_unaligned_deref(__p)), 1UL, #T " alignment"); \
  12 }
  13
  14 T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
  15
  16 struct A {
  17         int a;
  18 };
  19
  20 T_DECL(os_unaligned, "Unaligned pointer access")
  21 {
  22         int x = 0x914842;
  23         int *p = &x;
  24
  25         T_ASSERT_EQ_INT(os_unaligned_deref(p), x, "load");
  26         os_unaligned_deref(&x) = INT_MIN;
  27         T_ASSERT_EQ_INT(x, INT_MIN, "store");
  28
  29         CHECK_ALIGNMENT(unsigned);
  30         CHECK_ALIGNMENT(long long);
  31         CHECK_ALIGNMENT(uintptr_t);
  32         CHECK_ALIGNMENT(int16_t);
  33         CHECK_ALIGNMENT(uint64_t);
  34         CHECK_ALIGNMENT(struct A);
  35         CHECK_ALIGNMENT(void *);
  36 }