qemu/scripts/qapi/commands.py
John Snow 90254ec46d scripts/qapi: minor delinting
Get isort and pylint tools passing again.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20220211183650.2946895-1-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Comment explaining good-names-rgxs tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2022-02-28 11:39:35 +01:00

411 lines
11 KiB
Python

"""
QAPI command marshaller generator
Copyright IBM, Corp. 2011
Copyright (C) 2014-2018 Red Hat, Inc.
Authors:
Anthony Liguori <aliguori@us.ibm.com>
Michael Roth <mdroth@linux.vnet.ibm.com>
Markus Armbruster <armbru@redhat.com>
This work is licensed under the terms of the GNU GPL, version 2.
See the COPYING file in the top-level directory.
"""
from typing import (
Dict,
List,
Optional,
Set,
)
from .common import c_name, mcgen
from .gen import (
QAPIGenC,
QAPISchemaModularCVisitor,
build_params,
gen_special_features,
ifcontext,
)
from .schema import (
QAPISchema,
QAPISchemaFeature,
QAPISchemaIfCond,
QAPISchemaObjectType,
QAPISchemaType,
)
from .source import QAPISourceInfo
def gen_command_decl(name: str,
arg_type: Optional[QAPISchemaObjectType],
boxed: bool,
ret_type: Optional[QAPISchemaType]) -> str:
return mcgen('''
%(c_type)s qmp_%(c_name)s(%(params)s);
''',
c_type=(ret_type and ret_type.c_type()) or 'void',
c_name=c_name(name),
params=build_params(arg_type, boxed, 'Error **errp'))
def gen_call(name: str,
arg_type: Optional[QAPISchemaObjectType],
boxed: bool,
ret_type: Optional[QAPISchemaType],
gen_tracing: bool) -> str:
ret = ''
argstr = ''
if boxed:
assert arg_type
argstr = '&arg, '
elif arg_type:
assert not arg_type.variants
for memb in arg_type.members:
if memb.optional:
argstr += 'arg.has_%s, ' % c_name(memb.name)
argstr += 'arg.%s, ' % c_name(memb.name)
lhs = ''
if ret_type:
lhs = 'retval = '
name = c_name(name)
upper = name.upper()
if gen_tracing:
ret += mcgen('''
if (trace_event_get_state_backends(TRACE_QMP_ENTER_%(upper)s)) {
g_autoptr(GString) req_json = qobject_to_json(QOBJECT(args));
trace_qmp_enter_%(name)s(req_json->str);
}
''',
upper=upper, name=name)
ret += mcgen('''
%(lhs)sqmp_%(name)s(%(args)s&err);
''',
name=name, args=argstr, lhs=lhs)
ret += mcgen('''
if (err) {
''')
if gen_tracing:
ret += mcgen('''
trace_qmp_exit_%(name)s(error_get_pretty(err), false);
''',
name=name)
ret += mcgen('''
error_propagate(errp, err);
goto out;
}
''')
if ret_type:
ret += mcgen('''
qmp_marshal_output_%(c_name)s(retval, ret, errp);
''',
c_name=ret_type.c_name())
if gen_tracing:
if ret_type:
ret += mcgen('''
if (trace_event_get_state_backends(TRACE_QMP_EXIT_%(upper)s)) {
g_autoptr(GString) ret_json = qobject_to_json(*ret);
trace_qmp_exit_%(name)s(ret_json->str, true);
}
''',
upper=upper, name=name)
else:
ret += mcgen('''
trace_qmp_exit_%(name)s("{}", true);
''',
name=name)
return ret
def gen_marshal_output(ret_type: QAPISchemaType) -> str:
return mcgen('''
static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in,
QObject **ret_out, Error **errp)
{
Visitor *v;
v = qobject_output_visitor_new_qmp(ret_out);
if (visit_type_%(c_name)s(v, "unused", &ret_in, errp)) {
visit_complete(v, ret_out);
}
visit_free(v);
v = qapi_dealloc_visitor_new();
visit_type_%(c_name)s(v, "unused", &ret_in, NULL);
visit_free(v);
}
''',
c_type=ret_type.c_type(), c_name=ret_type.c_name())
def build_marshal_proto(name: str) -> str:
return ('void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)'
% c_name(name))
def gen_marshal_decl(name: str) -> str:
return mcgen('''
%(proto)s;
''',
proto=build_marshal_proto(name))
def gen_trace(name: str) -> str:
return mcgen('''
qmp_enter_%(name)s(const char *json) "%%s"
qmp_exit_%(name)s(const char *result, bool succeeded) "%%s %%d"
''',
name=c_name(name))
def gen_marshal(name: str,
arg_type: Optional[QAPISchemaObjectType],
boxed: bool,
ret_type: Optional[QAPISchemaType],
gen_tracing: bool) -> str:
have_args = boxed or (arg_type and not arg_type.is_empty())
if have_args:
assert arg_type is not None
arg_type_c_name = arg_type.c_name()
ret = mcgen('''
%(proto)s
{
Error *err = NULL;
bool ok = false;
Visitor *v;
''',
proto=build_marshal_proto(name))
if ret_type:
ret += mcgen('''
%(c_type)s retval;
''',
c_type=ret_type.c_type())
if have_args:
ret += mcgen('''
%(c_name)s arg = {0};
''',
c_name=arg_type_c_name)
ret += mcgen('''
v = qobject_input_visitor_new_qmp(QOBJECT(args));
if (!visit_start_struct(v, NULL, NULL, 0, errp)) {
goto out;
}
''')
if have_args:
ret += mcgen('''
if (visit_type_%(c_arg_type)s_members(v, &arg, errp)) {
ok = visit_check_struct(v, errp);
}
''',
c_arg_type=arg_type_c_name)
else:
ret += mcgen('''
ok = visit_check_struct(v, errp);
''')
ret += mcgen('''
visit_end_struct(v, NULL);
if (!ok) {
goto out;
}
''')
ret += gen_call(name, arg_type, boxed, ret_type, gen_tracing)
ret += mcgen('''
out:
visit_free(v);
''')
ret += mcgen('''
v = qapi_dealloc_visitor_new();
visit_start_struct(v, NULL, NULL, 0, NULL);
''')
if have_args:
ret += mcgen('''
visit_type_%(c_arg_type)s_members(v, &arg, NULL);
''',
c_arg_type=arg_type_c_name)
ret += mcgen('''
visit_end_struct(v, NULL);
visit_free(v);
''')
ret += mcgen('''
}
''')
return ret
def gen_register_command(name: str,
features: List[QAPISchemaFeature],
success_response: bool,
allow_oob: bool,
allow_preconfig: bool,
coroutine: bool) -> str:
options = []
if not success_response:
options += ['QCO_NO_SUCCESS_RESP']
if allow_oob:
options += ['QCO_ALLOW_OOB']
if allow_preconfig:
options += ['QCO_ALLOW_PRECONFIG']
if coroutine:
options += ['QCO_COROUTINE']
ret = mcgen('''
qmp_register_command(cmds, "%(name)s",
qmp_marshal_%(c_name)s, %(opts)s, %(feats)s);
''',
name=name, c_name=c_name(name),
opts=' | '.join(options) or 0,
feats=gen_special_features(features))
return ret
class QAPISchemaGenCommandVisitor(QAPISchemaModularCVisitor):
def __init__(self, prefix: str, gen_tracing: bool):
super().__init__(
prefix, 'qapi-commands',
' * Schema-defined QAPI/QMP commands', None, __doc__,
gen_tracing=gen_tracing)
self._visited_ret_types: Dict[QAPIGenC, Set[QAPISchemaType]] = {}
self._gen_tracing = gen_tracing
def _begin_user_module(self, name: str) -> None:
self._visited_ret_types[self._genc] = set()
commands = self._module_basename('qapi-commands', name)
types = self._module_basename('qapi-types', name)
visit = self._module_basename('qapi-visit', name)
self._genc.add(mcgen('''
#include "qemu/osdep.h"
#include "qapi/compat-policy.h"
#include "qapi/visitor.h"
#include "qapi/qmp/qdict.h"
#include "qapi/dealloc-visitor.h"
#include "qapi/error.h"
#include "%(visit)s.h"
#include "%(commands)s.h"
''',
commands=commands, visit=visit))
if self._gen_tracing and commands != 'qapi-commands':
self._genc.add(mcgen('''
#include "qapi/qmp/qjson.h"
#include "trace/trace-%(nm)s_trace_events.h"
''',
nm=c_name(commands, protect=False)))
# We use c_name(commands, protect=False) to turn '-' into '_', to
# match .underscorify() in trace/meson.build
self._genh.add(mcgen('''
#include "%(types)s.h"
''',
types=types))
def visit_begin(self, schema: QAPISchema) -> None:
self._add_module('./init', ' * QAPI Commands initialization')
self._genh.add(mcgen('''
#include "qapi/qmp/dispatch.h"
void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds);
''',
c_prefix=c_name(self._prefix, protect=False)))
self._genc.add(mcgen('''
#include "qemu/osdep.h"
#include "%(prefix)sqapi-commands.h"
#include "%(prefix)sqapi-init-commands.h"
void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds)
{
QTAILQ_INIT(cmds);
''',
prefix=self._prefix,
c_prefix=c_name(self._prefix, protect=False)))
def visit_end(self) -> None:
with self._temp_module('./init'):
self._genc.add(mcgen('''
}
'''))
def visit_command(self,
name: str,
info: Optional[QAPISourceInfo],
ifcond: QAPISchemaIfCond,
features: List[QAPISchemaFeature],
arg_type: Optional[QAPISchemaObjectType],
ret_type: Optional[QAPISchemaType],
gen: bool,
success_response: bool,
boxed: bool,
allow_oob: bool,
allow_preconfig: bool,
coroutine: bool) -> None:
if not gen:
return
# FIXME: If T is a user-defined type, the user is responsible
# for making this work, i.e. to make T's condition the
# conjunction of the T-returning commands' conditions. If T
# is a built-in type, this isn't possible: the
# qmp_marshal_output_T() will be generated unconditionally.
if ret_type and ret_type not in self._visited_ret_types[self._genc]:
self._visited_ret_types[self._genc].add(ret_type)
with ifcontext(ret_type.ifcond,
self._genh, self._genc):
self._genc.add(gen_marshal_output(ret_type))
with ifcontext(ifcond, self._genh, self._genc):
self._genh.add(gen_command_decl(name, arg_type, boxed, ret_type))
self._genh.add(gen_marshal_decl(name))
self._genc.add(gen_marshal(name, arg_type, boxed, ret_type,
self._gen_tracing))
if self._gen_tracing:
self._gen_trace_events.add(gen_trace(name))
with self._temp_module('./init'):
with ifcontext(ifcond, self._genh, self._genc):
self._genc.add(gen_register_command(
name, features, success_response, allow_oob,
allow_preconfig, coroutine))
def gen_commands(schema: QAPISchema,
output_dir: str,
prefix: str,
gen_tracing: bool) -> None:
vis = QAPISchemaGenCommandVisitor(prefix, gen_tracing)
schema.visit(vis)
vis.write(output_dir)