tests/check-structs.at

   1 AT_BANNER([struct alignment checker unit tests])
   2
   3 m4_define([check_structs], [$top_srcdir/build-aux/check-structs])
   4 m4_define([RUN_STRUCT_CHECKER],
   5   [AT_KEYWORDS([check-structs])
   6    AT_DATA([test.h], [$1
   7 ])
   8    AT_CHECK_UNQUOTED([$PYTHON3 check_structs test.h], [$2], [$3], [$4])])
   9
  10 AT_SETUP([check struct tail padding])
  11 RUN_STRUCT_CHECKER(
  12 [struct xyz {
  13     ovs_be16 x;
  14 };],
  15   [1], [],
  16   [test.h:3: warning: struct xyz needs 2 bytes of tail padding
  17 ])
  18 AT_CLEANUP
  19
  20 AT_SETUP([check struct internal alignment])
  21 RUN_STRUCT_CHECKER(
  22 [struct xyzzy {
  23     ovs_be16 x;
  24     ovs_be32 y;
  25 };],
  26   [1], [],
  27   [test.h:3: warning: struct xyzzy member y is 2 bytes short of 4-byte alignment
  28 ])
  29 AT_CLEANUP
  30
  31 AT_SETUP([check struct declared size])
  32 RUN_STRUCT_CHECKER(
  33 [struct wibble {
  34     ovs_be64 z;
  35 };
  36 OFP_ASSERT(sizeof(struct wibble) == 12);
  37 ],
  38   [1], [],
  39   [test.h:4: warning: struct wibble is 8 bytes long but declared as 12
  40 ])
  41 AT_CLEANUP
  42
  43 AT_SETUP([check wrong struct's declared size])
  44 RUN_STRUCT_CHECKER(
  45 [struct moo {
  46     ovs_be64 bar;
  47 };
  48 OFP_ASSERT(sizeof(struct moo) == 8);
  49 struct wibble {
  50     ovs_be64 z;
  51 };
  52 OFP_ASSERT(sizeof(struct moo) == 8);
  53 ], [1], [], [test.h:8: warning: checking size of struct moo but struct wibble was most recently defined
  54 ])
  55 AT_CLEANUP