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| author | Markus Armbruster | 2017-03-03 13:32:24 +0100 |
|---|---|---|
| committer | Markus Armbruster | 2017-03-05 09:02:10 +0100 |
| commit | 05875687806b71ae980ca59a46777b742b20ac06 (patch) | |
| tree | 383cdb241886b4e9309f25aa997866161d1908bf /include/qemu/module.h | |
| parent | qmp-test: New, covering basic QMP protocol (diff) | |
| download | qemu-05875687806b71ae980ca59a46777b742b20ac06.tar.gz qemu-05875687806b71ae980ca59a46777b742b20ac06.tar.xz qemu-05875687806b71ae980ca59a46777b742b20ac06.zip | |
qmp: Dumb down how we run QMP command registration
The way we get QMP commands registered is high tech:
* qapi-commands.py generates qmp_init_marshal() that does the actual work
* it also generates the magic to register it as a MODULE_INIT_QAPI
function, so it runs when someone calls
module_call_init(MODULE_INIT_QAPI)
* main() calls module_call_init()
QEMU needs to register a few non-qapified commands. Same high tech
works: monitor.c has its own qmp_init_marshal() along with the magic
to make it run in module_call_init(MODULE_INIT_QAPI).
QEMU also needs to unregister commands that are not wanted in this
build's configuration (commit 5032a16). Simple enough:
qmp_unregister_commands_hack(). The difficulty is to make it run
after the generated qmp_init_marshal(). We can't simply run it in
monitor.c's qmp_init_marshal(), because the order in which the
registered functions run is indeterminate. So qmp_init_marshal()
registers qmp_unregister_commands_hack() separately. Since
registering *appends* to the list of registered functions, this will
make it run after all the functions that have been registered already.
I suspect it takes a long and expensive computer science education to
not find this silly.
Dumb it down as follows:
* Drop MODULE_INIT_QAPI entirely
* Give the generated qmp_init_marshal() external linkage.
* Call it instead of module_call_init(MODULE_INIT_QAPI)
* Except in QEMU proper, call new monitor_init_qmp_commands() that in
turn calls the generated qmp_init_marshal(), registers the
additional commands and unregisters the unwanted ones.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1488544368-30622-5-git-send-email-armbru@redhat.com>
Diffstat (limited to 'include/qemu/module.h')
| -rw-r--r-- | include/qemu/module.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/qemu/module.h b/include/qemu/module.h index 877cca7d7b..56dd218205 100644 --- a/include/qemu/module.h +++ b/include/qemu/module.h @@ -42,7 +42,6 @@ static void __attribute__((constructor)) do_qemu_init_ ## function(void) \ typedef enum { MODULE_INIT_BLOCK, MODULE_INIT_OPTS, - MODULE_INIT_QAPI, MODULE_INIT_QOM, MODULE_INIT_TRACE, MODULE_INIT_MAX @@ -50,7 +49,6 @@ typedef enum { #define block_init(function) module_init(function, MODULE_INIT_BLOCK) #define opts_init(function) module_init(function, MODULE_INIT_OPTS) -#define qapi_init(function) module_init(function, MODULE_INIT_QAPI) #define type_init(function) module_init(function, MODULE_INIT_QOM) #define trace_init(function) module_init(function, MODULE_INIT_TRACE) |