summaryrefslogtreecommitdiff
path: root/scripts/qapi/visit.py
blob: de09966643de2be85598c0eb6108ee64e8bb3bec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
"""
QAPI visitor 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 qapi.common import *


def gen_visit_decl(name, scalar=False):
    c_type = c_name(name) + ' *'
    if not scalar:
        c_type += '*'
    return mcgen('''
void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_type)sobj, Error **errp);
''',
                 c_name=c_name(name), c_type=c_type)


def gen_visit_members_decl(name):
    return mcgen('''

void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp);
''',
                 c_name=c_name(name))


def gen_visit_object_members(name, base, members, variants):
    ret = mcgen('''

void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
{
    Error *err = NULL;

''',
                c_name=c_name(name))

    if base:
        ret += mcgen('''
    visit_type_%(c_type)s_members(v, (%(c_type)s *)obj, &err);
    if (err) {
        goto out;
    }
''',
                     c_type=base.c_name())

    for memb in members:
        if memb.optional:
            ret += mcgen('''
    if (visit_optional(v, "%(name)s", &obj->has_%(c_name)s)) {
''',
                         name=memb.name, c_name=c_name(memb.name))
            push_indent()
        ret += mcgen('''
    visit_type_%(c_type)s(v, "%(name)s", &obj->%(c_name)s, &err);
    if (err) {
        goto out;
    }
''',
                     c_type=memb.type.c_name(), name=memb.name,
                     c_name=c_name(memb.name))
        if memb.optional:
            pop_indent()
            ret += mcgen('''
    }
''')

    if variants:
        ret += mcgen('''
    switch (obj->%(c_name)s) {
''',
                     c_name=c_name(variants.tag_member.name))

        for var in variants.variants:
            ret += mcgen('''
    case %(case)s:
        visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, &err);
        break;
''',
                         case=c_enum_const(variants.tag_member.type.name,
                                           var.name,
                                           variants.tag_member.type.prefix),
                         c_type=var.type.c_name(), c_name=c_name(var.name))

        ret += mcgen('''
    default:
        abort();
    }
''')

    # 'goto out' produced for base, for each member, and if variants were
    # present
    if base or members or variants:
        ret += mcgen('''

out:
''')
    ret += mcgen('''
    error_propagate(errp, err);
}
''')
    return ret


def gen_visit_list(name, element_type):
    return mcgen('''

void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
{
    Error *err = NULL;
    %(c_name)s *tail;
    size_t size = sizeof(**obj);

    visit_start_list(v, name, (GenericList **)obj, size, &err);
    if (err) {
        goto out;
    }

    for (tail = *obj; tail;
         tail = (%(c_name)s *)visit_next_list(v, (GenericList *)tail, size)) {
        visit_type_%(c_elt_type)s(v, NULL, &tail->value, &err);
        if (err) {
            break;
        }
    }

    if (!err) {
        visit_check_list(v, &err);
    }
    visit_end_list(v, (void **)obj);
    if (err && visit_is_input(v)) {
        qapi_free_%(c_name)s(*obj);
        *obj = NULL;
    }
out:
    error_propagate(errp, err);
}
''',
                 c_name=c_name(name), c_elt_type=element_type.c_name())


def gen_visit_enum(name):
    return mcgen('''

void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s *obj, Error **errp)
{
    int value = *obj;
    visit_type_enum(v, name, &value, &%(c_name)s_lookup, errp);
    *obj = value;
}
''',
                 c_name=c_name(name))


def gen_visit_alternate(name, variants):
    ret = mcgen('''

void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
{
    Error *err = NULL;

    visit_start_alternate(v, name, (GenericAlternate **)obj, sizeof(**obj),
                          &err);
    if (err) {
        goto out;
    }
    if (!*obj) {
        goto out_obj;
    }
    switch ((*obj)->type) {
''',
                 c_name=c_name(name))

    for var in variants.variants:
        ret += mcgen('''
    case %(case)s:
''',
                     case=var.type.alternate_qtype())
        if isinstance(var.type, QAPISchemaObjectType):
            ret += mcgen('''
        visit_start_struct(v, name, NULL, 0, &err);
        if (err) {
            break;
        }
        visit_type_%(c_type)s_members(v, &(*obj)->u.%(c_name)s, &err);
        if (!err) {
            visit_check_struct(v, &err);
        }
        visit_end_struct(v, NULL);
''',
                         c_type=var.type.c_name(),
                         c_name=c_name(var.name))
        else:
            ret += mcgen('''
        visit_type_%(c_type)s(v, name, &(*obj)->u.%(c_name)s, &err);
''',
                         c_type=var.type.c_name(),
                         c_name=c_name(var.name))
        ret += mcgen('''
        break;
''')

    ret += mcgen('''
    case QTYPE_NONE:
        abort();
    default:
        error_setg(&err, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
                   "%(name)s");
    }
out_obj:
    visit_end_alternate(v, (void **)obj);
    if (err && visit_is_input(v)) {
        qapi_free_%(c_name)s(*obj);
        *obj = NULL;
    }
out:
    error_propagate(errp, err);
}
''',
                 name=name, c_name=c_name(name))

    return ret


def gen_visit_object(name, base, members, variants):
    return mcgen('''

void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
{
    Error *err = NULL;

    visit_start_struct(v, name, (void **)obj, sizeof(%(c_name)s), &err);
    if (err) {
        goto out;
    }
    if (!*obj) {
        goto out_obj;
    }
    visit_type_%(c_name)s_members(v, *obj, &err);
    if (err) {
        goto out_obj;
    }
    visit_check_struct(v, &err);
out_obj:
    visit_end_struct(v, (void **)obj);
    if (err && visit_is_input(v)) {
        qapi_free_%(c_name)s(*obj);
        *obj = NULL;
    }
out:
    error_propagate(errp, err);
}
''',
                 c_name=c_name(name))


class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):

    def __init__(self, prefix):
        QAPISchemaModularCVisitor.__init__(
            self, prefix, 'qapi-visit', ' * Schema-defined QAPI visitors',
            __doc__)
        self._add_module(None, ' * Built-in QAPI visitors')
        self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qapi-builtin-visit.h"
'''))
        self._genh.preamble_add(mcgen('''
#include "qapi/visitor.h"
#include "qapi-builtin-types.h"

''',
                                      prefix=prefix))

    def _begin_module(self, name):
        types = self._module_basename('qapi-types', name)
        visit = self._module_basename('qapi-visit', name)
        self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "%(visit)s.h"
''',
                                      visit=visit, prefix=self._prefix))
        self._genh.preamble_add(mcgen('''
#include "qapi-builtin-visit.h"
#include "%(types)s.h"

''',
                                      types=types))

    def visit_enum_type(self, name, info, values, prefix):
        self._genh.add(gen_visit_decl(name, scalar=True))
        self._genc.add(gen_visit_enum(name))

    def visit_array_type(self, name, info, element_type):
        self._genh.add(gen_visit_decl(name))
        self._genc.add(gen_visit_list(name, element_type))

    def visit_object_type(self, name, info, base, members, variants):
        # Nothing to do for the special empty builtin
        if name == 'q_empty':
            return
        self._genh.add(gen_visit_members_decl(name))
        self._genc.add(gen_visit_object_members(name, base, members, variants))
        # TODO Worth changing the visitor signature, so we could
        # directly use rather than repeat type.is_implicit()?
        if not name.startswith('q_'):
            # only explicit types need an allocating visit
            self._genh.add(gen_visit_decl(name))
            self._genc.add(gen_visit_object(name, base, members, variants))

    def visit_alternate_type(self, name, info, variants):
        self._genh.add(gen_visit_decl(name))
        self._genc.add(gen_visit_alternate(name, variants))


def gen_visit(schema, output_dir, prefix, opt_builtins):
    vis = QAPISchemaGenVisitVisitor(prefix)
    schema.visit(vis)
    vis.write(output_dir, opt_builtins)