0587568780
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>
320 lines
7.2 KiB
Python
320 lines
7.2 KiB
Python
#
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# QAPI command marshaller generator
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#
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# Copyright IBM, Corp. 2011
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# Copyright (C) 2014-2016 Red Hat, Inc.
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#
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# Authors:
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# Anthony Liguori <aliguori@us.ibm.com>
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# Michael Roth <mdroth@linux.vnet.ibm.com>
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# Markus Armbruster <armbru@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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from qapi import *
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import re
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def gen_command_decl(name, arg_type, boxed, ret_type):
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return mcgen('''
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%(c_type)s qmp_%(c_name)s(%(params)s);
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''',
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c_type=(ret_type and ret_type.c_type()) or 'void',
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c_name=c_name(name),
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params=gen_params(arg_type, boxed, 'Error **errp'))
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def gen_call(name, arg_type, boxed, ret_type):
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ret = ''
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argstr = ''
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if boxed:
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assert arg_type and not arg_type.is_empty()
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argstr = '&arg, '
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elif arg_type:
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assert not arg_type.variants
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for memb in arg_type.members:
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if memb.optional:
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argstr += 'arg.has_%s, ' % c_name(memb.name)
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argstr += 'arg.%s, ' % c_name(memb.name)
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lhs = ''
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if ret_type:
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lhs = 'retval = '
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ret = mcgen('''
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%(lhs)sqmp_%(c_name)s(%(args)s&err);
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''',
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c_name=c_name(name), args=argstr, lhs=lhs)
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if ret_type:
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ret += mcgen('''
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if (err) {
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goto out;
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}
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qmp_marshal_output_%(c_name)s(retval, ret, &err);
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''',
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c_name=ret_type.c_name())
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return ret
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def gen_marshal_output(ret_type):
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return mcgen('''
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static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in, QObject **ret_out, Error **errp)
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{
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Error *err = NULL;
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Visitor *v;
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v = qobject_output_visitor_new(ret_out);
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visit_type_%(c_name)s(v, "unused", &ret_in, &err);
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if (!err) {
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visit_complete(v, ret_out);
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}
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error_propagate(errp, err);
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visit_free(v);
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v = qapi_dealloc_visitor_new();
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visit_type_%(c_name)s(v, "unused", &ret_in, NULL);
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visit_free(v);
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}
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''',
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c_type=ret_type.c_type(), c_name=ret_type.c_name())
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def gen_marshal_proto(name):
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return 'void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name)
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def gen_marshal_decl(name):
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return mcgen('''
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%(proto)s;
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''',
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proto=gen_marshal_proto(name))
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def gen_marshal(name, arg_type, boxed, ret_type):
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have_args = arg_type and not arg_type.is_empty()
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ret = mcgen('''
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%(proto)s
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{
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Error *err = NULL;
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''',
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proto=gen_marshal_proto(name))
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if ret_type:
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ret += mcgen('''
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%(c_type)s retval;
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''',
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c_type=ret_type.c_type())
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if have_args:
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visit_members = ('visit_type_%s_members(v, &arg, &err);'
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% arg_type.c_name())
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ret += mcgen('''
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Visitor *v;
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%(c_name)s arg = {0};
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''',
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c_name=arg_type.c_name())
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else:
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visit_members = ''
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ret += mcgen('''
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Visitor *v = NULL;
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if (args) {
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''')
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push_indent()
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ret += mcgen('''
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v = qobject_input_visitor_new(QOBJECT(args), true);
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visit_start_struct(v, NULL, NULL, 0, &err);
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if (err) {
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goto out;
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}
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%(visit_members)s
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if (!err) {
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visit_check_struct(v, &err);
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}
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visit_end_struct(v, NULL);
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if (err) {
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goto out;
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}
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''',
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visit_members=visit_members)
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if not have_args:
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pop_indent()
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ret += mcgen('''
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}
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''')
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ret += gen_call(name, arg_type, boxed, ret_type)
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ret += mcgen('''
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out:
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error_propagate(errp, err);
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visit_free(v);
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''')
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if have_args:
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visit_members = ('visit_type_%s_members(v, &arg, NULL);'
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% arg_type.c_name())
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else:
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visit_members = ''
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ret += mcgen('''
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if (args) {
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''')
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push_indent()
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ret += mcgen('''
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v = qapi_dealloc_visitor_new();
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visit_start_struct(v, NULL, NULL, 0, NULL);
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%(visit_members)s
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visit_end_struct(v, NULL);
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visit_free(v);
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''',
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visit_members=visit_members)
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if not have_args:
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pop_indent()
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ret += mcgen('''
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}
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''')
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ret += mcgen('''
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}
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''')
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return ret
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def gen_register_command(name, success_response):
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options = 'QCO_NO_OPTIONS'
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if not success_response:
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options = 'QCO_NO_SUCCESS_RESP'
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ret = mcgen('''
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qmp_register_command("%(name)s", qmp_marshal_%(c_name)s, %(opts)s);
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''',
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name=name, c_name=c_name(name),
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opts=options)
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return ret
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def gen_registry(registry):
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ret = mcgen('''
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void qmp_init_marshal(void)
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{
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''')
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ret += registry
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ret += mcgen('''
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}
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''')
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return ret
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class QAPISchemaGenCommandVisitor(QAPISchemaVisitor):
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def __init__(self):
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self.decl = None
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self.defn = None
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self._regy = None
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self._visited_ret_types = None
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def visit_begin(self, schema):
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self.decl = ''
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self.defn = ''
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self._regy = ''
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self._visited_ret_types = set()
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def visit_end(self):
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self.defn += gen_registry(self._regy)
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self._regy = None
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self._visited_ret_types = None
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def visit_command(self, name, info, arg_type, ret_type,
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gen, success_response, boxed):
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if not gen:
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return
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self.decl += gen_command_decl(name, arg_type, boxed, ret_type)
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if ret_type and ret_type not in self._visited_ret_types:
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self._visited_ret_types.add(ret_type)
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self.defn += gen_marshal_output(ret_type)
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self.decl += gen_marshal_decl(name)
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self.defn += gen_marshal(name, arg_type, boxed, ret_type)
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self._regy += gen_register_command(name, success_response)
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(input_file, output_dir, do_c, do_h, prefix, opts) = parse_command_line()
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c_comment = '''
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/*
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* schema-defined QMP->QAPI command dispatch
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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'''
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h_comment = '''
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/*
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* schema-defined QAPI function prototypes
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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'''
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(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
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'qmp-marshal.c', 'qmp-commands.h',
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c_comment, h_comment)
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fdef.write(mcgen('''
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/module.h"
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#include "qapi/qmp/types.h"
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#include "qapi/qmp/dispatch.h"
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#include "qapi/visitor.h"
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#include "qapi/qobject-output-visitor.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/dealloc-visitor.h"
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#include "%(prefix)sqapi-types.h"
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#include "%(prefix)sqapi-visit.h"
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#include "%(prefix)sqmp-commands.h"
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''',
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prefix=prefix))
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fdecl.write(mcgen('''
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#include "%(prefix)sqapi-types.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/error.h"
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void qmp_init_marshal(void);
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''',
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prefix=prefix))
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schema = QAPISchema(input_file)
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gen = QAPISchemaGenCommandVisitor()
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schema.visit(gen)
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fdef.write(gen.defn)
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fdecl.write(gen.decl)
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close_output(fdef, fdecl)
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