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Eric Blake 02a57ae32b 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>
 		2016-02-19 11:08:56 +01:00
..
acpi-test-data tests: pc: acpi: add expected DSDT.bridge blobs and update DSDT blobs 2016-02-04 19:53:02 +02:00
guest-debug tests/guest-debug: introduce basic gdbstub tests 2015-12-17 13:37:15 +00:00
image-fuzzer tests: Use Python 2.6 "except E as ..." syntax 2016-02-08 17:29:54 +01:00
libqos tests: Clean up includes 2016-02-16 14:29:27 +00:00
multiboot tests/multiboot: Add test for modules 2015-01-26 12:22:44 +01:00
qapi-schema qapi: Forbid empty unions and useless alternates 2016-02-19 11:08:56 +01:00
qemu-iotests * Coverity fixes for IPMI and mptsas 2016-02-16 17:31:56 +00:00
rocker rocker: tests: don't need to specify master/self when setting vlans 2015-07-07 13:13:22 +01:00
tcg maint: remove unused include for signal.h 2015-09-11 10:21:38 +03:00
vmstate-static-checker-data tests: vmstate static checker: add size mismatch inside substructure 2014-06-23 19:14:52 +02:00
.gitignore crypto: add QCryptoSecret object class for password/key handling 2015-12-18 16:25:08 +00:00
Makefile nbd: convert block client to use I/O channels for connection setup 2016-02-16 17:13:22 +01:00
ac97-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ahci-test.c ide: Clean up includes 2016-01-29 15:07:23 +00:00
bios-tables-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
boot-order-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-block.sh qemu-iotests: make check-block.sh work on out-of-tree builds 2016-01-07 21:30:16 +01:00
check-qdict.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qfloat.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qint.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qjson.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qlist.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qom-interface.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qom-proplist.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
check-qstring.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
crypto-tls-x509-helpers.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
crypto-tls-x509-helpers.h crypto: add sanity checking of TLS x509 credentials 2015-09-15 15:05:09 +01:00
device-introspect-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
display-vga-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
drive_del-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ds1338-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
e1000-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
eepro100-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
endianness-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
es1370-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
fdc-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
fw_cfg-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
hd-geo-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
i440fx-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
i82801b11-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ide-test.c ide: Clean up includes 2016-01-29 15:07:23 +00:00
intel-hda-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
io-channel-helpers.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
io-channel-helpers.h io: add QIOChannelSocket class 2015-12-18 12:18:31 +00:00
ioh3420-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ipmi-bt-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ipmi-kcs-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ipoctal232-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ivshmem-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
libqtest.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
libqtest.h tests: Use proper functions types instead of void (*fn) 2015-12-04 18:25:42 +01:00
m48t59-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
ne2000-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
nvme-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
pc-cpu-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
pcnet-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
pkix_asn1_tab.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
pvpanic-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
q35-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
qemu-iotests-quick.sh qemu-iotests: Speed up make check-block 2015-01-13 11:47:55 +00:00
qom-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
rcutorture.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
rtc-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
rtl8139-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
spapr-phb-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
tco-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-aio.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-base64.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-bitops.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-blockjob-txn.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-coroutine.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-crypto-cipher.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-crypto-hash.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-crypto-secret.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-crypto-tlscredsx509.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-crypto-tlssession.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-cutils.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-hbitmap.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-int128.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-io-channel-buffer.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-io-channel-command.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-io-channel-file.c Merge I/O fixes 2016/02/16 v1 2016-02-16 15:47:35 +00:00
test-io-channel-socket.c Merge I/O fixes 2016/02/16 v1 2016-02-16 15:47:35 +00:00
test-io-channel-tls.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-io-task.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-iov.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-mul64.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-netfilter.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-opts-visitor.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qdev-global-props.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qemu-opts.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qga.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qmp-commands.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qmp-event.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qmp-input-strict.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qmp-input-visitor.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-qmp-output-visitor.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-rcu-list.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-rfifolock.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-string-input-visitor.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-string-output-visitor.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-thread-pool.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-throttle.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-timed-average.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-visitor-serialization.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-vmstate.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-write-threshold.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-x86-cpuid.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-xbzrle.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
tmp105-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
tpci200-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
usb-hcd-ehci-test.c usb: Clean up includes 2016-01-29 15:07:23 +00:00
usb-hcd-ohci-test.c usb: Clean up includes 2016-01-29 15:07:23 +00:00
usb-hcd-uhci-test.c usb: Clean up includes 2016-01-29 15:07:23 +00:00
usb-hcd-xhci-test.c usb: Clean up includes 2016-01-29 15:07:23 +00:00
vhost-user-bridge.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
vhost-user-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-9p-test.c 9pfs: Clean up includes 2016-01-29 15:07:23 +00:00
virtio-balloon-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-blk-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-console-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-net-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-rng-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-scsi-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
virtio-serial-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
vmxnet3-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
wdt_ib700-test.c tests: Clean up includes 2016-02-16 14:29:27 +00:00