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| author | Eric Blake | 2016-02-18 07:48:16 +0100 |
|---|---|---|
| committer | Markus Armbruster | 2016-02-19 11:08:56 +0100 |
| commit | 02a57ae32b08e8981b59979b80e682c9a153e94d (patch) | |
| tree | 418d1597e1ea5ff8e3f119fe453e990746299fe3 /tests/qapi-schema/union-empty.err | |
| parent | qapi: Simplify excess input reporting in input visitors (diff) | |
| download | qemu-02a57ae32b08e8981b59979b80e682c9a153e94d.tar.gz qemu-02a57ae32b08e8981b59979b80e682c9a153e94d.tar.xz qemu-02a57ae32b08e8981b59979b80e682c9a153e94d.zip | |
qapi: Forbid empty unions and useless alternates
Empty unions serve no purpose, and while we compile with gcc
which permits them, strict C99 forbids them. We happen to inject
a dummy 'void *data' member into the C unions that represent QAPI
unions and alternates, but we want to get rid of that member (it
pollutes the namespace for no good reason), which would leave us
with an empty union if the user didn't provide any branches. While
empty structs make sense in QAPI, empty unions don't add any
expressiveness to the QMP language. So prohibit them at parse
time. Update the documentation and testsuite to match.
Note that the documentation already mentioned that alternates
should have "two or more JSON data types"; so this also fixes
the code to enforce that. However, we have existing uses of a
union type with only one branch, so the 2-or-more strictness
is intentionally limited to alternates.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1455778109-6278-3-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'tests/qapi-schema/union-empty.err')
| -rw-r--r-- | tests/qapi-schema/union-empty.err | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/qapi-schema/union-empty.err b/tests/qapi-schema/union-empty.err index e69de29bb2..12c20221bd 100644 --- a/tests/qapi-schema/union-empty.err +++ b/tests/qapi-schema/union-empty.err @@ -0,0 +1 @@ +tests/qapi-schema/union-empty.json:2: Union 'Union' cannot have empty 'data' |