static VALUE which_oneof_field(MessageHeader* self, const upb_oneofdef* o) {
// If no fields in the oneof, always nil.
if (upb_oneofdef_numfields(o) == 0) {
return Qnil;
}
// Grab the first field in the oneof so we can get its layout info to find the
// oneof_case field.
upb_oneof_iter it;
upb_oneof_begin(&it, o);
assert(!upb_oneof_done(&it));
const upb_fielddef* first_field = upb_oneof_iter_field(&it);
assert(upb_fielddef_containingoneof(first_field) != NULL);
size_t case_ofs =
self->descriptor->layout->
fields[upb_fielddef_index(first_field)].case_offset;
uint32_t oneof_case = *((uint32_t*)(Message_data(self) + case_ofs));
if (oneof_case == ONEOF_CASE_NONE) {
return Qnil;
}
// oneof_case is a field index, so find that field.
const upb_fielddef* f = upb_oneofdef_itof(o, oneof_case);
assert(f != NULL);
return ID2SYM(rb_intern(upb_fielddef_name(f)));
}
static void test_oneofs() {
upb_status s = UPB_STATUS_INIT;
bool ok = true;
upb_def *subm_defs[1];
upb_symtab *symtab = upb_symtab_new(&symtab);
upb_msgdef *subm = upb_msgdef_newnamed("SubMessage", &symtab);
upb_msgdef *m = upb_msgdef_newnamed("TestMessage", &symtab);
upb_oneofdef *o = upb_oneofdef_new(&o);
const upb_oneofdef *lookup_o;
const upb_fielddef *lookup_field;
upb_def *defs[1];
ASSERT(symtab != NULL);
/* Create a test message for fields to refer to. */
upb_msgdef_addfield(subm, newfield("field1", 1, UPB_TYPE_INT32,
UPB_LABEL_OPTIONAL, NULL, &symtab),
&symtab, NULL);
subm_defs[0] = upb_msgdef_upcast_mutable(subm);
ASSERT_STATUS(upb_symtab_add(symtab, subm_defs, 1, &symtab, &s), &s);
ASSERT(upb_msgdef_numoneofs(m) == 0);
ASSERT(upb_oneofdef_numfields(o) == 0);
ASSERT(upb_oneofdef_name(o) == NULL);
ok = upb_oneofdef_setname(o, "test_oneof", &s);
ASSERT_STATUS(ok, &s);
ok = upb_oneofdef_addfield(o, newfield("field1", 1, UPB_TYPE_INT32,
UPB_LABEL_OPTIONAL, NULL, &symtab),
&symtab, NULL);
ASSERT_STATUS(ok, &s);
ok = upb_oneofdef_addfield(o, newfield("field2", 2, UPB_TYPE_MESSAGE,
UPB_LABEL_OPTIONAL, ".SubMessage",
&symtab),
&symtab, NULL);
ASSERT_STATUS(ok, &s);
ok = upb_msgdef_addoneof(m, o, NULL, &s);
ASSERT_STATUS(ok, &s);
defs[0] = upb_msgdef_upcast_mutable(m);
ASSERT_STATUS(upb_symtab_add(symtab, defs, 1, &symtab, &s), &s);
ASSERT(upb_msgdef_numoneofs(m) == 1);
lookup_o = upb_msgdef_ntooz(m, "test_oneof");
ASSERT(lookup_o == o);
lookup_field = upb_oneofdef_ntofz(o, "field1");
ASSERT(lookup_field != NULL && upb_fielddef_number(lookup_field) == 1);
upb_symtab_unref(symtab, &symtab);
upb_oneofdef_unref(o, &o);
}
