3ff2a5a35c
A previous commit narrowed the type of QAPISchemaObjectType.variants from QAPISchemaVariants to QAPISchemaBranches. Rename it to .branches. Same for .__init__() parameter @variants. Signed-off-by: Markus Armbruster <armbru@redhat.com>
252 lines
7.4 KiB
Python
252 lines
7.4 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 typing import List, Optional
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from .common import c_enum_const, c_name, mcgen
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from .gen import QAPISchemaModularCVisitor, build_params, ifcontext
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from .schema import (
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QAPISchema,
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QAPISchemaEnumMember,
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QAPISchemaFeature,
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QAPISchemaIfCond,
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QAPISchemaObjectType,
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)
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from .source import QAPISourceInfo
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from .types import gen_enum, gen_enum_lookup
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def build_event_send_proto(name: str,
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arg_type: Optional[QAPISchemaObjectType],
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boxed: bool) -> str:
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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)}
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def gen_event_send_decl(name: str,
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arg_type: Optional[QAPISchemaObjectType],
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boxed: bool) -> str:
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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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def gen_param_var(typ: QAPISchemaObjectType) -> str:
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"""
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Generate a struct variable holding the event parameters.
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Initialize it with the function arguments defined in `gen_event_send`.
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"""
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assert not typ.branches
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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.need_has():
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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: str,
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arg_type: Optional[QAPISchemaObjectType],
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features: List[QAPISchemaFeature],
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boxed: bool,
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event_enum_name: str,
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event_emit: str) -> str:
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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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have_args = boxed or (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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QDict *qmp;
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''',
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proto=build_event_send_proto(name, arg_type, boxed))
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if have_args:
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assert arg_type is not None
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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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for f in features:
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if f.is_special():
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ret += mcgen('''
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if (compat_policy.%(feat)s_output == COMPAT_POLICY_OUTPUT_HIDE) {
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return;
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}
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''',
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feat=f.name)
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ret += mcgen('''
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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 have_args:
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assert arg_type is not None
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ret += mcgen('''
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v = qobject_output_visitor_new_qmp(&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, &error_abort);
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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, &error_abort);
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visit_type_%(c_name)s_members(v, ¶m, &error_abort);
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visit_check_struct(v, &error_abort);
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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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visit_complete(v, &obj);
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if (qdict_size(qobject_to(QDict, obj))) {
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qdict_put_obj(qmp, "data", obj);
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} else {
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qobject_unref(obj);
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}
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''')
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ret += mcgen('''
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%(event_emit)s(%(c_enum)s, qmp);
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''',
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event_emit=event_emit,
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c_enum=c_enum_const(event_enum_name, name))
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if have_args:
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ret += mcgen('''
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visit_free(v);
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''')
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ret += mcgen('''
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qobject_unref(qmp);
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}
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''')
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return ret
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class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
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def __init__(self, prefix: str):
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super().__init__(
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prefix, 'qapi-events',
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' * Schema-defined QAPI/QMP events', None, __doc__)
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self._event_enum_name = c_name(prefix + 'QAPIEvent', protect=False)
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self._event_enum_members: List[QAPISchemaEnumMember] = []
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self._event_emit_name = c_name(prefix + 'qapi_event_emit')
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def _begin_user_module(self, name: str) -> None:
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events = self._module_basename('qapi-events', name)
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types = self._module_basename('qapi-types', name)
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visit = self._module_basename('qapi-visit', name)
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self._genc.add(mcgen('''
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#include "qemu/osdep.h"
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#include "%(prefix)sqapi-emit-events.h"
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#include "%(events)s.h"
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#include "%(visit)s.h"
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#include "qapi/compat-policy.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp-event.h"
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''',
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events=events, visit=visit,
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prefix=self._prefix))
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self._genh.add(mcgen('''
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#include "qapi/util.h"
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#include "%(types)s.h"
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''',
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types=types))
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def visit_end(self) -> None:
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self._add_module('./emit', ' * QAPI Events emission')
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self._genc.preamble_add(mcgen('''
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#include "qemu/osdep.h"
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#include "%(prefix)sqapi-emit-events.h"
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''',
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prefix=self._prefix))
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self._genh.preamble_add(mcgen('''
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#include "qapi/util.h"
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'''))
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self._genh.add(gen_enum(self._event_enum_name,
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self._event_enum_members))
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self._genc.add(gen_enum_lookup(self._event_enum_name,
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self._event_enum_members))
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self._genh.add(mcgen('''
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void %(event_emit)s(%(event_enum)s event, QDict *qdict);
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''',
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event_emit=self._event_emit_name,
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event_enum=self._event_enum_name))
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def visit_event(self,
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name: str,
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info: Optional[QAPISourceInfo],
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ifcond: QAPISchemaIfCond,
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features: List[QAPISchemaFeature],
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arg_type: Optional[QAPISchemaObjectType],
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boxed: bool) -> None:
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with ifcontext(ifcond, self._genh, self._genc):
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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, features, boxed,
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self._event_enum_name,
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self._event_emit_name))
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# Note: we generate the enum member regardless of @ifcond, to
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# keep the enumeration usable in target-independent code.
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self._event_enum_members.append(QAPISchemaEnumMember(name, None))
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def gen_events(schema: QAPISchema,
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output_dir: str,
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prefix: str) -> None:
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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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