/* Check the syntax tree for semantic errors, and convert
* some of the nodes into the form they need to be in order to
* later generate the DFVM bytecode. */
gboolean
dfw_semcheck(dfwork_t *dfw)
{
volatile gboolean ok_filter = TRUE;
#ifdef DEBUG_dfilter
static guint i = 0;
#endif
DebugLog(("1 dfw_semcheck(dfwork_t *dfw = %p) [%u]\n", dfw, i));
/* Instead of having to check for errors at every stage of
* the semantic-checking, the semantic-checking code will
* throw an exception if a problem is found. */
TRY {
semcheck(dfw->st_root);
}
CATCH(TypeError) {
ok_filter = FALSE;
}
ENDTRY;
DebugLog(("1 dfw_semcheck(dfwork_t *dfw = %p) [%u] - Returns %d\n",
dfw, i++,ok_filter));
return ok_filter;
}
/* Check the semantics of any type of TEST */
static void
check_test(stnode_t *st_node)
{
test_op_t st_op;
stnode_t *st_arg1, *st_arg2;
#ifdef DEBUG_dfilter
static guint i = 0;
#endif
DebugLog((" 3 check_test(stnode_t *st_node = %p) [%u]\n", st_node, i));
sttype_test_get(st_node, &st_op, &st_arg1, &st_arg2);
switch (st_op) {
case TEST_OP_UNINITIALIZED:
g_assert_not_reached();
break;
case TEST_OP_EXISTS:
check_exists(st_arg1);
break;
case TEST_OP_NOT:
semcheck(st_arg1);
break;
case TEST_OP_AND:
case TEST_OP_OR:
semcheck(st_arg1);
semcheck(st_arg2);
break;
case TEST_OP_EQ:
check_relation("==", FALSE, ftype_can_eq, st_node, st_arg1, st_arg2);
break;
case TEST_OP_NE:
check_relation("!=", FALSE, ftype_can_ne, st_node, st_arg1, st_arg2);
break;
case TEST_OP_GT:
check_relation(">", FALSE, ftype_can_gt, st_node, st_arg1, st_arg2);
break;
case TEST_OP_GE:
check_relation(">=", FALSE, ftype_can_ge, st_node, st_arg1, st_arg2);
break;
case TEST_OP_LT:
check_relation("<", FALSE, ftype_can_lt, st_node, st_arg1, st_arg2);
break;
case TEST_OP_LE:
check_relation("<=", FALSE, ftype_can_le, st_node, st_arg1, st_arg2);
break;
case TEST_OP_BITWISE_AND:
check_relation("&", FALSE, ftype_can_bitwise_and, st_node, st_arg1, st_arg2);
break;
case TEST_OP_CONTAINS:
check_relation("contains", TRUE, ftype_can_contains, st_node, st_arg1, st_arg2);
break;
case TEST_OP_MATCHES:
#ifdef HAVE_LIBPCRE
check_relation("matches", TRUE, ftype_can_matches, st_node, st_arg1, st_arg2);
#else
dfilter_fail("This Wireshark version does not support the \"matches\" operation.");
THROW(TypeError);
#endif
break;
default:
g_assert_not_reached();
}
DebugLog((" 3 check_test(stnode_t *st_node = %p) [%u] - End\n", st_node, i++));
}
/* Check the semantics of any type of TEST */
static void
check_test(stnode_t *st_node, GPtrArray *deprecated)
{
test_op_t st_op, st_arg_op;
stnode_t *st_arg1, *st_arg2;
#ifdef DEBUG_dfilter
static guint i = 0;
#endif
DebugLog((" 3 check_test(stnode_t *st_node = %p) [%u]\n", st_node, i));
sttype_test_get(st_node, &st_op, &st_arg1, &st_arg2);
switch (st_op) {
case TEST_OP_UNINITIALIZED:
g_assert_not_reached();
break;
case TEST_OP_EXISTS:
check_exists(st_arg1);
break;
case TEST_OP_NOT:
semcheck(st_arg1, deprecated);
break;
case TEST_OP_AND:
case TEST_OP_OR:
if (stnode_type_id(st_arg1) == STTYPE_TEST) {
sttype_test_get(st_arg1, &st_arg_op, NULL, NULL);
if (st_arg_op == TEST_OP_AND || st_arg_op == TEST_OP_OR) {
if (st_op != st_arg_op && !st_arg1->inside_brackets)
g_ptr_array_add(deprecated, g_strdup("suggest parentheses around '&&' within '||'"));
}
}
if (stnode_type_id(st_arg2) == STTYPE_TEST) {
sttype_test_get(st_arg2, &st_arg_op, NULL, NULL);
if (st_arg_op == TEST_OP_AND || st_arg_op == TEST_OP_OR) {
if (st_op != st_arg_op && !st_arg2->inside_brackets)
g_ptr_array_add(deprecated, g_strdup("suggest parentheses around '&&' within '||'"));
}
}
semcheck(st_arg1, deprecated);
semcheck(st_arg2, deprecated);
break;
case TEST_OP_EQ:
check_relation("==", FALSE, ftype_can_eq, st_node, st_arg1, st_arg2);
break;
case TEST_OP_NE:
check_relation("!=", FALSE, ftype_can_ne, st_node, st_arg1, st_arg2);
break;
case TEST_OP_GT:
check_relation(">", FALSE, ftype_can_gt, st_node, st_arg1, st_arg2);
break;
case TEST_OP_GE:
check_relation(">=", FALSE, ftype_can_ge, st_node, st_arg1, st_arg2);
break;
case TEST_OP_LT:
check_relation("<", FALSE, ftype_can_lt, st_node, st_arg1, st_arg2);
break;
case TEST_OP_LE:
check_relation("<=", FALSE, ftype_can_le, st_node, st_arg1, st_arg2);
break;
case TEST_OP_BITWISE_AND:
check_relation("&", FALSE, ftype_can_bitwise_and, st_node, st_arg1, st_arg2);
break;
case TEST_OP_CONTAINS:
check_relation("contains", TRUE, ftype_can_contains, st_node, st_arg1, st_arg2);
break;
case TEST_OP_MATCHES:
check_relation("matches", TRUE, ftype_can_matches, st_node, st_arg1, st_arg2); break;
default:
g_assert_not_reached();
}
DebugLog((" 3 check_test(stnode_t *st_node = %p) [%u] - End\n", st_node, i++));
}
