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unicorn/qemu
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Eric Blake 907771516e
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.

Backports commit 02a57ae32b08e8981b59979b80e682c9a153e94d from qemu
2018-02-20 15:46:08 -05:00
..
crypto crypto: Clean up includes 2018-02-19 00:47:40 -05:00
default-configs arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
docs docs: clarify memory region lifecycle 2018-02-12 15:11:21 -05:00
fpu all: Clean up includes 2018-02-19 01:34:28 -05:00
hw x86: Clean up includes 2018-02-19 01:00:09 -05:00
include qom: Correct object_property_get_int() description 2018-02-20 11:52:16 -05:00
qapi qmp: Don't abuse stack to track qmp-output root 2018-02-20 08:09:56 -05:00
qobject qapi: Convert QType into QAPI built-in enum type 2018-02-19 21:47:05 -05:00
qom cpu: Add callback to check architectural watchpoint match 2018-02-20 11:43:56 -05:00
scripts qapi: Forbid empty unions and useless alternates 2018-02-20 15:46:08 -05:00
target-arm target-arm: Add PMUSERENR_EL0 register 2018-02-20 15:36:31 -05:00
target-i386 target-i386: Implement FSGSBASE 2018-02-20 14:45:58 -05:00
target-m68k m68k: Clean up includes 2018-02-19 01:06:05 -05:00
target-mips mips: Clean up includes 2018-02-19 00:45:08 -05:00
target-sparc sparc: Clean up includes 2018-02-19 00:52:41 -05:00
tcg target-i386: Implement BNDMK 2018-02-20 14:02:31 -05:00
util error: New error_fatal 2018-02-20 08:22:27 -05:00
aarch64.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
aarch64eb.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
accel.c all: Clean up includes 2018-02-19 01:34:28 -05:00
arm.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
armeb.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
CODING_STYLE import 2015-08-21 15:04:50 +08:00
configure tcg: Drop ia64 host support 2018-02-04 18:33:02 -05:00
COPYING import 2015-08-21 15:04:50 +08:00
COPYING.LIB import 2015-08-21 15:04:50 +08:00
cpu-exec-common.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
cpu-exec.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
cpus.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
cputlb.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
exec.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
gen_all_header.sh arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
glib_compat.c crypto: introduce new module for computing hash digests 2018-02-17 15:23:17 -05:00
HACKING import 2015-08-21 15:04:50 +08:00
header_gen.py target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
ioport.c all: Clean up includes 2018-02-19 01:34:28 -05:00
LICENSE import 2015-08-21 15:04:50 +08:00
m68k.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
Makefile qapi: Turn generators' mandatory option -i into an argument 2018-02-19 15:22:27 -05:00
Makefile.objs crypto: move crypto objects out of libqemuutil.la 2018-02-17 15:23:50 -05:00
Makefile.target tcg: split tcg_op_defs to -common 2018-02-17 15:23:51 -05:00
memory.c qom: Swap 'name' next to visitor in ObjectPropertyAccessor 2018-02-19 23:14:37 -05:00
memory_mapping.c all: Clean up includes 2018-02-19 01:34:28 -05:00
mips.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
mips64.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
mips64el.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
mipsel.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
powerpc.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
qapi-schema.json qapi: Lazy creation of array types 2018-02-19 18:55:35 -05:00
qemu-log.c all: Clean up includes 2018-02-19 01:34:28 -05:00
qemu-timer.c all: Clean up includes 2018-02-19 01:34:28 -05:00
rules.mak import 2015-08-21 15:04:50 +08:00
softmmu_template.h exec.c: Pass MemTxAttrs to iotlb_to_region so it uses the right AS 2018-02-17 23:19:00 -05:00
sparc.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
sparc64.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00
tcg-runtime.c all: Clean up includes 2018-02-19 01:34:28 -05:00
translate-all.c all: Clean up includes 2018-02-19 01:34:28 -05:00
translate-all.h translate-all: remove unnecessary argument to tb_invalidate_phys_range 2018-02-13 09:04:51 -05:00
translate-common.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
unicorn_common.h qom/cpu: Add MemoryRegion property 2018-02-18 21:54:50 -05:00
VERSION import 2015-08-21 15:04:50 +08:00
vl.c vl.c: Remove periods and exclamation points from error messages 2018-02-17 15:24:14 -05:00
vl.h import 2015-08-21 15:04:50 +08:00
x86_64.h target-arm: Implement checking of fired watchpoint 2018-02-20 11:50:29 -05:00