The use of QAPIGen is rather shallow so far: most of the output accumulation is not converted. Take the next step: convert output accumulation in the code-generating visitor classes. Helper functions outside these classes are not converted. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180211093607.27351-20-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> [eblake: rebase to earlier guardstart cleanup] Signed-off-by: Eric Blake <eblake@redhat.com>
192 lines
4.8 KiB
Python
192 lines
4.8 KiB
Python
"""
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QAPI event generator
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Copyright (c) 2014 Wenchao Xia
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Copyright (c) 2015-2018 Red Hat Inc.
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Authors:
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Wenchao Xia <wenchaoqemu@gmail.com>
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Markus Armbruster <armbru@redhat.com>
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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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"""
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from qapi.common import *
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def build_event_send_proto(name, arg_type, boxed):
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return 'void qapi_event_send_%(c_name)s(%(param)s)' % {
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'c_name': c_name(name.lower()),
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'param': build_params(arg_type, boxed, 'Error **errp')}
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def gen_event_send_decl(name, arg_type, boxed):
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return mcgen('''
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%(proto)s;
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''',
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proto=build_event_send_proto(name, arg_type, boxed))
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# Declare and initialize an object 'qapi' using parameters from build_params()
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def gen_param_var(typ):
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assert not typ.variants
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ret = mcgen('''
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%(c_name)s param = {
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''',
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c_name=typ.c_name())
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sep = ' '
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for memb in typ.members:
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ret += sep
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sep = ', '
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if memb.optional:
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ret += 'has_' + c_name(memb.name) + sep
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if memb.type.name == 'str':
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# Cast away const added in build_params()
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ret += '(char *)'
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ret += c_name(memb.name)
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ret += mcgen('''
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};
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''')
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if not typ.is_implicit():
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ret += mcgen('''
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%(c_name)s *arg = ¶m;
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''',
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c_name=typ.c_name())
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return ret
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def gen_event_send(name, arg_type, boxed, event_enum_name):
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# FIXME: Our declaration of local variables (and of 'errp' in the
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# parameter list) can collide with exploded members of the event's
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# data type passed in as parameters. If this collision ever hits in
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# practice, we can rename our local variables with a leading _ prefix,
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# or split the code into a wrapper function that creates a boxed
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# 'param' object then calls another to do the real work.
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ret = mcgen('''
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%(proto)s
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{
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QDict *qmp;
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Error *err = NULL;
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QMPEventFuncEmit emit;
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''',
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proto=build_event_send_proto(name, arg_type, boxed))
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if arg_type and not arg_type.is_empty():
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ret += mcgen('''
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QObject *obj;
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Visitor *v;
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''')
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if not boxed:
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ret += gen_param_var(arg_type)
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else:
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assert not boxed
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ret += mcgen('''
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emit = qmp_event_get_func_emit();
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if (!emit) {
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return;
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}
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qmp = qmp_event_build_dict("%(name)s");
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''',
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name=name)
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if arg_type and not arg_type.is_empty():
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ret += mcgen('''
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v = qobject_output_visitor_new(&obj);
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''')
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if not arg_type.is_implicit():
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ret += mcgen('''
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visit_type_%(c_name)s(v, "%(name)s", &arg, &err);
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''',
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name=name, c_name=arg_type.c_name())
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else:
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ret += mcgen('''
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visit_start_struct(v, "%(name)s", NULL, 0, &err);
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if (err) {
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goto out;
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}
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visit_type_%(c_name)s_members(v, ¶m, &err);
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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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''',
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name=name, c_name=arg_type.c_name())
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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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visit_complete(v, &obj);
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qdict_put_obj(qmp, "data", obj);
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''')
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ret += mcgen('''
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emit(%(c_enum)s, qmp, &err);
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''',
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c_enum=c_enum_const(event_enum_name, name))
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if arg_type and not arg_type.is_empty():
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ret += mcgen('''
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out:
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visit_free(v);
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''')
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ret += mcgen('''
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error_propagate(errp, err);
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QDECREF(qmp);
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}
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''')
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return ret
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class QAPISchemaGenEventVisitor(QAPISchemaMonolithicCVisitor):
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def __init__(self, prefix):
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QAPISchemaMonolithicCVisitor.__init__(
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self, prefix, 'qapi-event',
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' * Schema-defined QAPI/QMP events', __doc__)
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self._enum_name = c_name(prefix + 'QAPIEvent', protect=False)
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self._event_names = []
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self._genc.add(mcgen('''
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "%(prefix)sqapi-event.h"
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#include "%(prefix)sqapi-visit.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qobject-output-visitor.h"
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#include "qapi/qmp-event.h"
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''',
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prefix=prefix))
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self._genh.add(mcgen('''
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#include "qapi/util.h"
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#include "%(prefix)sqapi-types.h"
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''',
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prefix=prefix))
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def visit_end(self):
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self._genh.add(gen_enum(self._enum_name, self._event_names))
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self._genc.add(gen_enum_lookup(self._enum_name, self._event_names))
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def visit_event(self, name, info, arg_type, boxed):
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self._genh.add(gen_event_send_decl(name, arg_type, boxed))
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self._genc.add(gen_event_send(name, arg_type, boxed, self._enum_name))
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self._event_names.append(name)
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def gen_events(schema, output_dir, prefix):
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vis = QAPISchemaGenEventVisitor(prefix)
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schema.visit(vis)
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vis.write(output_dir)
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