Merge remote-tracking branch 'remotes/jasowang/tags/net-pull-request' into staging
[qemu/ar7.git] / scripts / qapi / commands.py
blob0e13d510547a837542f361ee88fd6d37bbb93f81
1 """
2 QAPI command marshaller generator
4 Copyright IBM, Corp. 2011
5 Copyright (C) 2014-2018 Red Hat, Inc.
7 Authors:
8 Anthony Liguori <aliguori@us.ibm.com>
9 Michael Roth <mdroth@linux.vnet.ibm.com>
10 Markus Armbruster <armbru@redhat.com>
12 This work is licensed under the terms of the GNU GPL, version 2.
13 See the COPYING file in the top-level directory.
14 """
16 from typing import (
17 Dict,
18 List,
19 Optional,
20 Sequence,
21 Set,
24 from .common import c_name, mcgen
25 from .gen import (
26 QAPIGenC,
27 QAPISchemaModularCVisitor,
28 build_params,
29 ifcontext,
31 from .schema import (
32 QAPISchema,
33 QAPISchemaFeature,
34 QAPISchemaObjectType,
35 QAPISchemaType,
37 from .source import QAPISourceInfo
40 def gen_command_decl(name: str,
41 arg_type: Optional[QAPISchemaObjectType],
42 boxed: bool,
43 ret_type: Optional[QAPISchemaType]) -> str:
44 return mcgen('''
45 %(c_type)s qmp_%(c_name)s(%(params)s);
46 ''',
47 c_type=(ret_type and ret_type.c_type()) or 'void',
48 c_name=c_name(name),
49 params=build_params(arg_type, boxed, 'Error **errp'))
52 def gen_call(name: str,
53 arg_type: Optional[QAPISchemaObjectType],
54 boxed: bool,
55 ret_type: Optional[QAPISchemaType]) -> str:
56 ret = ''
58 argstr = ''
59 if boxed:
60 assert arg_type
61 argstr = '&arg, '
62 elif arg_type:
63 assert not arg_type.variants
64 for memb in arg_type.members:
65 if memb.optional:
66 argstr += 'arg.has_%s, ' % c_name(memb.name)
67 argstr += 'arg.%s, ' % c_name(memb.name)
69 lhs = ''
70 if ret_type:
71 lhs = 'retval = '
73 ret = mcgen('''
75 %(lhs)sqmp_%(c_name)s(%(args)s&err);
76 error_propagate(errp, err);
77 ''',
78 c_name=c_name(name), args=argstr, lhs=lhs)
79 if ret_type:
80 ret += mcgen('''
81 if (err) {
82 goto out;
85 qmp_marshal_output_%(c_name)s(retval, ret, errp);
86 ''',
87 c_name=ret_type.c_name())
88 return ret
91 def gen_marshal_output(ret_type: QAPISchemaType) -> str:
92 return mcgen('''
94 static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in,
95 QObject **ret_out, Error **errp)
97 Visitor *v;
99 v = qobject_output_visitor_new_qmp(ret_out);
100 if (visit_type_%(c_name)s(v, "unused", &ret_in, errp)) {
101 visit_complete(v, ret_out);
103 visit_free(v);
104 v = qapi_dealloc_visitor_new();
105 visit_type_%(c_name)s(v, "unused", &ret_in, NULL);
106 visit_free(v);
108 ''',
109 c_type=ret_type.c_type(), c_name=ret_type.c_name())
112 def build_marshal_proto(name: str) -> str:
113 return ('void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)'
114 % c_name(name))
117 def gen_marshal_decl(name: str) -> str:
118 return mcgen('''
119 %(proto)s;
120 ''',
121 proto=build_marshal_proto(name))
124 def gen_marshal(name: str,
125 arg_type: Optional[QAPISchemaObjectType],
126 boxed: bool,
127 ret_type: Optional[QAPISchemaType]) -> str:
128 have_args = boxed or (arg_type and not arg_type.is_empty())
129 if have_args:
130 assert arg_type is not None
131 arg_type_c_name = arg_type.c_name()
133 ret = mcgen('''
135 %(proto)s
137 Error *err = NULL;
138 bool ok = false;
139 Visitor *v;
140 ''',
141 proto=build_marshal_proto(name))
143 if ret_type:
144 ret += mcgen('''
145 %(c_type)s retval;
146 ''',
147 c_type=ret_type.c_type())
149 if have_args:
150 ret += mcgen('''
151 %(c_name)s arg = {0};
152 ''',
153 c_name=arg_type_c_name)
155 ret += mcgen('''
157 v = qobject_input_visitor_new_qmp(QOBJECT(args));
158 if (!visit_start_struct(v, NULL, NULL, 0, errp)) {
159 goto out;
161 ''')
163 if have_args:
164 ret += mcgen('''
165 if (visit_type_%(c_arg_type)s_members(v, &arg, errp)) {
166 ok = visit_check_struct(v, errp);
168 ''',
169 c_arg_type=arg_type_c_name)
170 else:
171 ret += mcgen('''
172 ok = visit_check_struct(v, errp);
173 ''')
175 ret += mcgen('''
176 visit_end_struct(v, NULL);
177 if (!ok) {
178 goto out;
180 ''')
182 ret += gen_call(name, arg_type, boxed, ret_type)
184 ret += mcgen('''
186 out:
187 visit_free(v);
188 ''')
190 ret += mcgen('''
191 v = qapi_dealloc_visitor_new();
192 visit_start_struct(v, NULL, NULL, 0, NULL);
193 ''')
195 if have_args:
196 ret += mcgen('''
197 visit_type_%(c_arg_type)s_members(v, &arg, NULL);
198 ''',
199 c_arg_type=arg_type_c_name)
201 ret += mcgen('''
202 visit_end_struct(v, NULL);
203 visit_free(v);
204 ''')
206 ret += mcgen('''
208 ''')
209 return ret
212 def gen_register_command(name: str,
213 features: List[QAPISchemaFeature],
214 success_response: bool,
215 allow_oob: bool,
216 allow_preconfig: bool,
217 coroutine: bool) -> str:
218 options = []
220 if 'deprecated' in [f.name for f in features]:
221 options += ['QCO_DEPRECATED']
223 if not success_response:
224 options += ['QCO_NO_SUCCESS_RESP']
225 if allow_oob:
226 options += ['QCO_ALLOW_OOB']
227 if allow_preconfig:
228 options += ['QCO_ALLOW_PRECONFIG']
229 if coroutine:
230 options += ['QCO_COROUTINE']
232 if not options:
233 options = ['QCO_NO_OPTIONS']
235 ret = mcgen('''
236 qmp_register_command(cmds, "%(name)s",
237 qmp_marshal_%(c_name)s, %(opts)s);
238 ''',
239 name=name, c_name=c_name(name),
240 opts=" | ".join(options))
241 return ret
244 class QAPISchemaGenCommandVisitor(QAPISchemaModularCVisitor):
245 def __init__(self, prefix: str):
246 super().__init__(
247 prefix, 'qapi-commands',
248 ' * Schema-defined QAPI/QMP commands', None, __doc__)
249 self._visited_ret_types: Dict[QAPIGenC, Set[QAPISchemaType]] = {}
251 def _begin_user_module(self, name: str) -> None:
252 self._visited_ret_types[self._genc] = set()
253 commands = self._module_basename('qapi-commands', name)
254 types = self._module_basename('qapi-types', name)
255 visit = self._module_basename('qapi-visit', name)
256 self._genc.add(mcgen('''
257 #include "qemu/osdep.h"
258 #include "qapi/compat-policy.h"
259 #include "qapi/visitor.h"
260 #include "qapi/qmp/qdict.h"
261 #include "qapi/dealloc-visitor.h"
262 #include "qapi/error.h"
263 #include "%(visit)s.h"
264 #include "%(commands)s.h"
266 ''',
267 commands=commands, visit=visit))
268 self._genh.add(mcgen('''
269 #include "%(types)s.h"
271 ''',
272 types=types))
274 def visit_begin(self, schema: QAPISchema) -> None:
275 self._add_module('./init', ' * QAPI Commands initialization')
276 self._genh.add(mcgen('''
277 #include "qapi/qmp/dispatch.h"
279 void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds);
280 ''',
281 c_prefix=c_name(self._prefix, protect=False)))
282 self._genc.add(mcgen('''
283 #include "qemu/osdep.h"
284 #include "%(prefix)sqapi-commands.h"
285 #include "%(prefix)sqapi-init-commands.h"
287 void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds)
289 QTAILQ_INIT(cmds);
291 ''',
292 prefix=self._prefix,
293 c_prefix=c_name(self._prefix, protect=False)))
295 def visit_end(self) -> None:
296 with self._temp_module('./init'):
297 self._genc.add(mcgen('''
299 '''))
301 def visit_command(self,
302 name: str,
303 info: Optional[QAPISourceInfo],
304 ifcond: Sequence[str],
305 features: List[QAPISchemaFeature],
306 arg_type: Optional[QAPISchemaObjectType],
307 ret_type: Optional[QAPISchemaType],
308 gen: bool,
309 success_response: bool,
310 boxed: bool,
311 allow_oob: bool,
312 allow_preconfig: bool,
313 coroutine: bool) -> None:
314 if not gen:
315 return
316 # FIXME: If T is a user-defined type, the user is responsible
317 # for making this work, i.e. to make T's condition the
318 # conjunction of the T-returning commands' conditions. If T
319 # is a built-in type, this isn't possible: the
320 # qmp_marshal_output_T() will be generated unconditionally.
321 if ret_type and ret_type not in self._visited_ret_types[self._genc]:
322 self._visited_ret_types[self._genc].add(ret_type)
323 with ifcontext(ret_type.ifcond,
324 self._genh, self._genc):
325 self._genc.add(gen_marshal_output(ret_type))
326 with ifcontext(ifcond, self._genh, self._genc):
327 self._genh.add(gen_command_decl(name, arg_type, boxed, ret_type))
328 self._genh.add(gen_marshal_decl(name))
329 self._genc.add(gen_marshal(name, arg_type, boxed, ret_type))
330 with self._temp_module('./init'):
331 with ifcontext(ifcond, self._genh, self._genc):
332 self._genc.add(gen_register_command(
333 name, features, success_response, allow_oob,
334 allow_preconfig, coroutine))
337 def gen_commands(schema: QAPISchema,
338 output_dir: str,
339 prefix: str) -> None:
340 vis = QAPISchemaGenCommandVisitor(prefix)
341 schema.visit(vis)
342 vis.write(output_dir)