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_SKIP_IF([test $HAVE_PYTHON = no])
   7    AT_DATA([test.h], [$1
   8 ])
   9    AT_CHECK_UNQUOTED([$PYTHON check_structs test.h], [$2], [$3], [$4])])
  10
  11 AT_SETUP([check struct tail padding])
  12 RUN_STRUCT_CHECKER(
  13 [struct xyz {
  14     ovs_be16 x;
  15 };],
  16   [1], [],
  17   [test.h:3: warning: struct xyz needs 2 bytes of tail padding
  18 ])
  19 AT_CLEANUP
  20
  21 AT_SETUP([check struct internal alignment])
  22 RUN_STRUCT_CHECKER(
  23 [struct xyzzy {
  24     ovs_be16 x;
  25     ovs_be32 y;
  26 };],
  27   [1], [],
  28   [test.h:3: warning: struct xyzzy member y is 2 bytes short of 4-byte alignment
  29 ])
  30 AT_CLEANUP
  31
  32 AT_SETUP([check struct declared size])
  33 RUN_STRUCT_CHECKER(
  34 [struct wibble {
  35     ovs_be64 z;
  36 };
  37 OFP_ASSERT(sizeof(struct wibble) == 12);
  38 ],
  39   [1], [],
  40   [test.h:4: warning: struct wibble is 8 bytes long but declared as 12
  41 ])
  42 AT_CLEANUP
  43
  44 AT_SETUP([check wrong struct's declared size])
  45 RUN_STRUCT_CHECKER(
  46 [struct moo {
  47     ovs_be64 bar;
  48 };
  49 OFP_ASSERT(sizeof(struct moo) == 8);
  50 struct wibble {
  51     ovs_be64 z;
  52 };
  53 OFP_ASSERT(sizeof(struct moo) == 8);
  54 ], [1], [], [test.h:8: warning: checking size of struct moo but struct wibble was most recently defined
  55 ])
  56 AT_CLEANUP