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qmp: Wean off qerror_report()

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The traditional QMP command handler interface

    int qmp_FOO(Monitor *mon, const QDict *params, QObject **ret_data);

doesn't provide for returning an Error object.  Instead, the handler
is expected to stash it in the monitor with qerror_report().

When we rebased QMP on top of QAPI, we didn't change this interface.
Instead, commit 776574d introduced "middle mode" as a temporary aid
for converting existing QMP commands to QAPI one by one.  More than
three years later, we're still using it.

Middle mode has two effects:

* Instead of the native input marshallers

      static void qmp_marshal_input_FOO(QDict *, QObject **, Error **)

  it generates input marshallers conforming to the traditional QMP
  command handler interface.

* It suppresses generation of code to register them with
  qmp_register_command()

  This permits giving them internal linkage.

As long as we need qmp-commands.hx, we can't use the registry behind
qmp_register_command(), so the latter has to stay for now.

The former has to go to get rid of qerror_report().  Changing all QMP
commands to fit the QAPI mold in one go was impractical back when we
started, but by now there are just a few stragglers left:
do_qmp_capabilities(), qmp_qom_set(), qmp_qom_get(), qmp_object_add(),
qmp_netdev_add(), do_device_add().

Switch middle mode to generate native input marshallers, and adapt the
stragglers.  Simplifies both the monitor code and the stragglers.

Rename do_qmp_capabilities() to qmp_capabilities(), and
do_device_add() to qmp_device_add, because that's how QMP command
handlers are named today.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Markus Armbruster 2015-03-13 17:25:50 +01:00
parent 8b53a19675
commit 485febc6d1
11 changed files with 50 additions and 126 deletions
Download patch file Download diff file Expand all files Collapse all files

41
scripts/qapi-commands.py
View file

@ -195,12 +195,10 @@ out:
return ret
def gen_marshal_input_decl(name, args, ret_type, middle_mode):
if middle_mode:
return 'int qmp_marshal_input_%s(Monitor *mon, const QDict *qdict, QObject **ret)' % c_name(name)
else:
return 'static void qmp_marshal_input_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name)
ret = 'void qmp_marshal_input_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name)
if not middle_mode:
ret = "static " + ret
return ret
def gen_marshal_input(name, args, ret_type, middle_mode):
hdr = gen_marshal_input_decl(name, args, ret_type, middle_mode)
@ -212,11 +210,6 @@ def gen_marshal_input(name, args, ret_type, middle_mode):
''',
header=hdr)
if middle_mode:
ret += mcgen('''
QDict *args = (QDict *)qdict;
''')
if ret_type:
if is_c_ptr(ret_type):
retval = " %s retval = NULL;" % c_type(ret_type)
@ -252,36 +245,14 @@ def gen_marshal_input(name, args, ret_type, middle_mode):
ret += mcgen('''
out:
''')
if not middle_mode:
ret += mcgen('''
error_propagate(errp, local_err);
''')
ret += mcgen('''
error_propagate(errp, local_err);
%(visitor_input_block_cleanup)s
}
''',
visitor_input_block_cleanup=gen_visitor_input_block(args,
dealloc=True))
if middle_mode:
ret += mcgen('''
if (local_err) {
qerror_report_err(local_err);
error_free(local_err);
return -1;
}
return 0;
''')
else:
ret += mcgen('''
return;
''')
ret += mcgen('''
}
''')
return ret
def gen_registry(commands):