Now that we have separated union tag values from colliding with
non-variant C names, by naming the union 'u', we should reserve
this name for our use. Note that we want to forbid 'u' even in
a struct with no variants, because it is possible for a future
qemu release to extend QMP in a backwards-compatible manner while
converting from a struct to a flat union. Fortunately, no
existing clients were using this member name. If we ever find
the need for QMP to have a member 'u', we could at that time
relax things, perhaps by having c_name() munge the QMP member to
'q_u'.
Note that we cannot forbid 'u' everywhere (by adding the
rejection code to check_name()), because the existing QKeyCode
enum already uses it; therefore we only reserve it as a struct
type member name.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <
1445898903-12082-24-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
for (key, arg) in value.items():
check_name(expr_info, "Member of %s" % source, key,
allow_optional=allow_optional)
- if c_name(key, False).startswith('has_'):
+ if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'):
raise QAPIExprError(expr_info,
"Member of %s uses reserved name '%s'"
% (source, key))
qapi-schema += reserved-command-q.json
qapi-schema += reserved-member-has.json
qapi-schema += reserved-member-q.json
+qapi-schema += reserved-member-u.json
qapi-schema += reserved-type-kind.json
qapi-schema += reserved-type-list.json
qapi-schema += returns-alternate.json
--- /dev/null
+tests/qapi-schema/reserved-member-u.json:7: Member of 'data' for struct 'Oops' uses reserved name 'u'
--- /dev/null
+# Potential C member name collision
+# We reject use of 'u' as a member name, to allow it for internal use in
+# putting union branch members in a separate namespace from QMP members.
+# This is true even for non-unions, because it is possible to convert a
+# struct to flat union while remaining backwards compatible in QMP.
+# TODO - we could munge the member name to 'q_u' to avoid the collision
+{ 'struct': 'Oops', 'data': { 'u': 'str' } }