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2f28d2ff AL |
1 | /* |
2 | * QEMU Object Model | |
3 | * | |
4 | * Copyright IBM, Corp. 2011 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "qemu/object.h" | |
14 | #include "qemu-common.h" | |
57c9fafe | 15 | #include "qapi/qapi-visit-core.h" |
2f28d2ff AL |
16 | |
17 | #define MAX_INTERFACES 32 | |
18 | ||
19 | typedef struct InterfaceImpl InterfaceImpl; | |
20 | typedef struct TypeImpl TypeImpl; | |
21 | ||
22 | struct InterfaceImpl | |
23 | { | |
24 | const char *parent; | |
25 | void (*interface_initfn)(ObjectClass *class, void *data); | |
26 | TypeImpl *type; | |
27 | }; | |
28 | ||
29 | struct TypeImpl | |
30 | { | |
31 | const char *name; | |
32 | ||
33 | size_t class_size; | |
34 | ||
35 | size_t instance_size; | |
36 | ||
37 | void (*class_init)(ObjectClass *klass, void *data); | |
38 | void (*class_finalize)(ObjectClass *klass, void *data); | |
39 | ||
40 | void *class_data; | |
41 | ||
42 | void (*instance_init)(Object *obj); | |
43 | void (*instance_finalize)(Object *obj); | |
44 | ||
45 | bool abstract; | |
46 | ||
47 | const char *parent; | |
48 | TypeImpl *parent_type; | |
49 | ||
50 | ObjectClass *class; | |
51 | ||
52 | int num_interfaces; | |
53 | InterfaceImpl interfaces[MAX_INTERFACES]; | |
54 | }; | |
55 | ||
56 | typedef struct Interface | |
57 | { | |
58 | Object parent; | |
59 | Object *obj; | |
60 | } Interface; | |
61 | ||
62 | #define INTERFACE(obj) OBJECT_CHECK(Interface, obj, TYPE_INTERFACE) | |
63 | ||
9970bd88 PB |
64 | static Type type_interface; |
65 | ||
2f28d2ff AL |
66 | static GHashTable *type_table_get(void) |
67 | { | |
68 | static GHashTable *type_table; | |
69 | ||
70 | if (type_table == NULL) { | |
71 | type_table = g_hash_table_new(g_str_hash, g_str_equal); | |
72 | } | |
73 | ||
74 | return type_table; | |
75 | } | |
76 | ||
77 | static void type_table_add(TypeImpl *ti) | |
78 | { | |
79 | g_hash_table_insert(type_table_get(), (void *)ti->name, ti); | |
80 | } | |
81 | ||
82 | static TypeImpl *type_table_lookup(const char *name) | |
83 | { | |
84 | return g_hash_table_lookup(type_table_get(), name); | |
85 | } | |
86 | ||
87 | TypeImpl *type_register(const TypeInfo *info) | |
88 | { | |
89 | TypeImpl *ti = g_malloc0(sizeof(*ti)); | |
90 | ||
91 | g_assert(info->name != NULL); | |
92 | ||
73093354 AL |
93 | if (type_table_lookup(info->name) != NULL) { |
94 | fprintf(stderr, "Registering `%s' which already exists\n", info->name); | |
95 | abort(); | |
96 | } | |
97 | ||
2f28d2ff AL |
98 | ti->name = g_strdup(info->name); |
99 | ti->parent = g_strdup(info->parent); | |
100 | ||
101 | ti->class_size = info->class_size; | |
102 | ti->instance_size = info->instance_size; | |
103 | ||
104 | ti->class_init = info->class_init; | |
105 | ti->class_finalize = info->class_finalize; | |
106 | ti->class_data = info->class_data; | |
107 | ||
108 | ti->instance_init = info->instance_init; | |
109 | ti->instance_finalize = info->instance_finalize; | |
110 | ||
111 | ti->abstract = info->abstract; | |
112 | ||
113 | if (info->interfaces) { | |
114 | int i; | |
115 | ||
116 | for (i = 0; info->interfaces[i].type; i++) { | |
117 | ti->interfaces[i].parent = info->interfaces[i].type; | |
118 | ti->interfaces[i].interface_initfn = info->interfaces[i].interface_initfn; | |
119 | ti->num_interfaces++; | |
120 | } | |
121 | } | |
122 | ||
123 | type_table_add(ti); | |
124 | ||
125 | return ti; | |
126 | } | |
127 | ||
128 | TypeImpl *type_register_static(const TypeInfo *info) | |
129 | { | |
130 | return type_register(info); | |
131 | } | |
132 | ||
133 | static TypeImpl *type_get_by_name(const char *name) | |
134 | { | |
135 | if (name == NULL) { | |
136 | return NULL; | |
137 | } | |
138 | ||
139 | return type_table_lookup(name); | |
140 | } | |
141 | ||
142 | static TypeImpl *type_get_parent(TypeImpl *type) | |
143 | { | |
144 | if (!type->parent_type && type->parent) { | |
145 | type->parent_type = type_get_by_name(type->parent); | |
146 | g_assert(type->parent_type != NULL); | |
147 | } | |
148 | ||
149 | return type->parent_type; | |
150 | } | |
151 | ||
152 | static bool type_has_parent(TypeImpl *type) | |
153 | { | |
154 | return (type->parent != NULL); | |
155 | } | |
156 | ||
157 | static size_t type_class_get_size(TypeImpl *ti) | |
158 | { | |
159 | if (ti->class_size) { | |
160 | return ti->class_size; | |
161 | } | |
162 | ||
163 | if (type_has_parent(ti)) { | |
164 | return type_class_get_size(type_get_parent(ti)); | |
165 | } | |
166 | ||
167 | return sizeof(ObjectClass); | |
168 | } | |
169 | ||
170 | static void type_class_interface_init(TypeImpl *ti, InterfaceImpl *iface) | |
171 | { | |
172 | TypeInfo info = { | |
173 | .instance_size = sizeof(Interface), | |
174 | .parent = iface->parent, | |
175 | .class_size = sizeof(InterfaceClass), | |
176 | .class_init = iface->interface_initfn, | |
177 | .abstract = true, | |
178 | }; | |
179 | char *name = g_strdup_printf("<%s::%s>", ti->name, iface->parent); | |
180 | ||
181 | info.name = name; | |
182 | iface->type = type_register(&info); | |
183 | g_free(name); | |
184 | } | |
185 | ||
186 | static void type_class_init(TypeImpl *ti) | |
187 | { | |
188 | size_t class_size = sizeof(ObjectClass); | |
189 | int i; | |
190 | ||
191 | if (ti->class) { | |
192 | return; | |
193 | } | |
194 | ||
195 | ti->class_size = type_class_get_size(ti); | |
196 | ||
197 | ti->class = g_malloc0(ti->class_size); | |
198 | ti->class->type = ti; | |
199 | ||
200 | if (type_has_parent(ti)) { | |
201 | TypeImpl *parent = type_get_parent(ti); | |
202 | ||
203 | type_class_init(parent); | |
204 | ||
205 | class_size = parent->class_size; | |
206 | g_assert(parent->class_size <= ti->class_size); | |
207 | ||
208 | memcpy((void *)ti->class + sizeof(ObjectClass), | |
209 | (void *)parent->class + sizeof(ObjectClass), | |
210 | parent->class_size - sizeof(ObjectClass)); | |
211 | } | |
212 | ||
213 | memset((void *)ti->class + class_size, 0, ti->class_size - class_size); | |
214 | ||
215 | for (i = 0; i < ti->num_interfaces; i++) { | |
216 | type_class_interface_init(ti, &ti->interfaces[i]); | |
217 | } | |
218 | ||
219 | if (ti->class_init) { | |
220 | ti->class_init(ti->class, ti->class_data); | |
221 | } | |
222 | } | |
223 | ||
224 | static void object_interface_init(Object *obj, InterfaceImpl *iface) | |
225 | { | |
226 | TypeImpl *ti = iface->type; | |
227 | Interface *iface_obj; | |
228 | ||
229 | iface_obj = INTERFACE(object_new(ti->name)); | |
230 | iface_obj->obj = obj; | |
231 | ||
232 | obj->interfaces = g_slist_prepend(obj->interfaces, iface_obj); | |
233 | } | |
234 | ||
235 | static void object_init_with_type(Object *obj, TypeImpl *ti) | |
236 | { | |
237 | int i; | |
238 | ||
239 | if (type_has_parent(ti)) { | |
240 | object_init_with_type(obj, type_get_parent(ti)); | |
241 | } | |
242 | ||
243 | for (i = 0; i < ti->num_interfaces; i++) { | |
244 | object_interface_init(obj, &ti->interfaces[i]); | |
245 | } | |
246 | ||
247 | if (ti->instance_init) { | |
248 | ti->instance_init(obj); | |
249 | } | |
250 | } | |
251 | ||
252 | void object_initialize_with_type(void *data, TypeImpl *type) | |
253 | { | |
254 | Object *obj = data; | |
255 | ||
256 | g_assert(type != NULL); | |
257 | g_assert(type->instance_size >= sizeof(ObjectClass)); | |
258 | ||
259 | type_class_init(type); | |
260 | g_assert(type->abstract == false); | |
261 | ||
262 | memset(obj, 0, type->instance_size); | |
263 | obj->class = type->class; | |
57c9fafe | 264 | QTAILQ_INIT(&obj->properties); |
2f28d2ff AL |
265 | object_init_with_type(obj, type); |
266 | } | |
267 | ||
268 | void object_initialize(void *data, const char *typename) | |
269 | { | |
270 | TypeImpl *type = type_get_by_name(typename); | |
271 | ||
272 | object_initialize_with_type(data, type); | |
273 | } | |
274 | ||
57c9fafe AL |
275 | static void object_property_del_all(Object *obj) |
276 | { | |
277 | while (!QTAILQ_EMPTY(&obj->properties)) { | |
278 | ObjectProperty *prop = QTAILQ_FIRST(&obj->properties); | |
279 | ||
280 | QTAILQ_REMOVE(&obj->properties, prop, node); | |
281 | ||
282 | if (prop->release) { | |
283 | prop->release(obj, prop->name, prop->opaque); | |
284 | } | |
285 | ||
286 | g_free(prop->name); | |
287 | g_free(prop->type); | |
288 | g_free(prop); | |
289 | } | |
290 | } | |
291 | ||
292 | static void object_property_del_child(Object *obj, Object *child, Error **errp) | |
293 | { | |
294 | ObjectProperty *prop; | |
295 | ||
296 | QTAILQ_FOREACH(prop, &obj->properties, node) { | |
297 | if (!strstart(prop->type, "child<", NULL)) { | |
298 | continue; | |
299 | } | |
300 | ||
301 | if (prop->opaque == child) { | |
302 | object_property_del(obj, prop->name, errp); | |
303 | } | |
304 | } | |
305 | } | |
306 | ||
307 | void object_unparent(Object *obj) | |
308 | { | |
309 | if (obj->parent) { | |
310 | object_property_del_child(obj->parent, obj, NULL); | |
311 | } | |
312 | } | |
313 | ||
2f28d2ff AL |
314 | static void object_deinit(Object *obj, TypeImpl *type) |
315 | { | |
316 | if (type->instance_finalize) { | |
317 | type->instance_finalize(obj); | |
318 | } | |
319 | ||
320 | while (obj->interfaces) { | |
321 | Interface *iface_obj = obj->interfaces->data; | |
322 | obj->interfaces = g_slist_delete_link(obj->interfaces, obj->interfaces); | |
323 | object_delete(OBJECT(iface_obj)); | |
324 | } | |
325 | ||
326 | if (type_has_parent(type)) { | |
327 | object_deinit(obj, type_get_parent(type)); | |
328 | } | |
57c9fafe AL |
329 | |
330 | object_unparent(obj); | |
2f28d2ff AL |
331 | } |
332 | ||
333 | void object_finalize(void *data) | |
334 | { | |
335 | Object *obj = data; | |
336 | TypeImpl *ti = obj->class->type; | |
337 | ||
338 | object_deinit(obj, ti); | |
57c9fafe | 339 | object_property_del_all(obj); |
db85b575 AL |
340 | |
341 | g_assert(obj->ref == 0); | |
2f28d2ff AL |
342 | } |
343 | ||
344 | Object *object_new_with_type(Type type) | |
345 | { | |
346 | Object *obj; | |
347 | ||
348 | g_assert(type != NULL); | |
349 | ||
350 | obj = g_malloc(type->instance_size); | |
351 | object_initialize_with_type(obj, type); | |
db85b575 | 352 | object_ref(obj); |
2f28d2ff AL |
353 | |
354 | return obj; | |
355 | } | |
356 | ||
357 | Object *object_new(const char *typename) | |
358 | { | |
359 | TypeImpl *ti = type_get_by_name(typename); | |
360 | ||
361 | return object_new_with_type(ti); | |
362 | } | |
363 | ||
364 | void object_delete(Object *obj) | |
365 | { | |
db85b575 AL |
366 | object_unref(obj); |
367 | g_assert(obj->ref == 0); | |
2f28d2ff AL |
368 | g_free(obj); |
369 | } | |
370 | ||
acc4af3f | 371 | static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type) |
2f28d2ff | 372 | { |
acc4af3f | 373 | assert(target_type); |
2f28d2ff AL |
374 | |
375 | /* Check if typename is a direct ancestor of type */ | |
376 | while (type) { | |
377 | if (type == target_type) { | |
378 | return true; | |
379 | } | |
380 | ||
381 | type = type_get_parent(type); | |
382 | } | |
383 | ||
acc4af3f PB |
384 | return false; |
385 | } | |
2f28d2ff | 386 | |
9970bd88 | 387 | static bool object_is_type(Object *obj, TypeImpl *target_type) |
acc4af3f | 388 | { |
9970bd88 | 389 | return !target_type || type_is_ancestor(obj->class->type, target_type); |
2f28d2ff AL |
390 | } |
391 | ||
392 | Object *object_dynamic_cast(Object *obj, const char *typename) | |
393 | { | |
9970bd88 | 394 | TypeImpl *target_type = type_get_by_name(typename); |
2f28d2ff AL |
395 | GSList *i; |
396 | ||
acc4af3f PB |
397 | /* Check if typename is a direct ancestor. Special-case TYPE_OBJECT, |
398 | * we want to go back from interfaces to the parent. | |
399 | */ | |
9970bd88 | 400 | if (target_type && object_is_type(obj, target_type)) { |
acc4af3f PB |
401 | return obj; |
402 | } | |
403 | ||
404 | /* Check if obj is an interface and its containing object is a direct | |
405 | * ancestor of typename. In principle we could do this test at the very | |
406 | * beginning of object_dynamic_cast, avoiding a second call to | |
407 | * object_is_type. However, casting between interfaces is relatively | |
9970bd88 | 408 | * rare, and object_is_type(obj, type_interface) would fail almost always. |
acc4af3f PB |
409 | * |
410 | * Perhaps we could add a magic value to the object header for increased | |
411 | * (run-time) type safety and to speed up tests like this one. If we ever | |
412 | * do that we can revisit the order here. | |
413 | */ | |
9970bd88 | 414 | if (object_is_type(obj, type_interface)) { |
acc4af3f PB |
415 | assert(!obj->interfaces); |
416 | obj = INTERFACE(obj)->obj; | |
9970bd88 | 417 | if (object_is_type(obj, target_type)) { |
acc4af3f PB |
418 | return obj; |
419 | } | |
420 | } | |
421 | ||
9970bd88 | 422 | if (!target_type) { |
2f28d2ff AL |
423 | return obj; |
424 | } | |
425 | ||
426 | /* Check if obj has an interface of typename */ | |
427 | for (i = obj->interfaces; i; i = i->next) { | |
428 | Interface *iface = i->data; | |
429 | ||
9970bd88 | 430 | if (object_is_type(OBJECT(iface), target_type)) { |
2f28d2ff AL |
431 | return OBJECT(iface); |
432 | } | |
433 | } | |
434 | ||
2f28d2ff AL |
435 | return NULL; |
436 | } | |
437 | ||
438 | ||
439 | static void register_interface(void) | |
440 | { | |
441 | static TypeInfo interface_info = { | |
442 | .name = TYPE_INTERFACE, | |
443 | .instance_size = sizeof(Interface), | |
444 | .abstract = true, | |
445 | }; | |
446 | ||
9970bd88 | 447 | type_interface = type_register_static(&interface_info); |
2f28d2ff AL |
448 | } |
449 | ||
450 | device_init(register_interface); | |
451 | ||
452 | Object *object_dynamic_cast_assert(Object *obj, const char *typename) | |
453 | { | |
454 | Object *inst; | |
455 | ||
456 | inst = object_dynamic_cast(obj, typename); | |
457 | ||
458 | if (!inst) { | |
459 | fprintf(stderr, "Object %p is not an instance of type %s\n", | |
460 | obj, typename); | |
461 | abort(); | |
462 | } | |
463 | ||
464 | return inst; | |
465 | } | |
466 | ||
467 | ObjectClass *object_class_dynamic_cast(ObjectClass *class, | |
468 | const char *typename) | |
469 | { | |
470 | TypeImpl *target_type = type_get_by_name(typename); | |
471 | TypeImpl *type = class->type; | |
472 | ||
473 | while (type) { | |
474 | if (type == target_type) { | |
475 | return class; | |
476 | } | |
477 | ||
478 | type = type_get_parent(type); | |
479 | } | |
480 | ||
481 | return NULL; | |
482 | } | |
483 | ||
484 | ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class, | |
485 | const char *typename) | |
486 | { | |
487 | ObjectClass *ret = object_class_dynamic_cast(class, typename); | |
488 | ||
489 | if (!ret) { | |
490 | fprintf(stderr, "Object %p is not an instance of type %s\n", | |
491 | class, typename); | |
492 | abort(); | |
493 | } | |
494 | ||
495 | return ret; | |
496 | } | |
497 | ||
498 | const char *object_get_typename(Object *obj) | |
499 | { | |
500 | return obj->class->type->name; | |
501 | } | |
502 | ||
503 | ObjectClass *object_get_class(Object *obj) | |
504 | { | |
505 | return obj->class; | |
506 | } | |
507 | ||
508 | const char *object_class_get_name(ObjectClass *klass) | |
509 | { | |
510 | return klass->type->name; | |
511 | } | |
512 | ||
513 | ObjectClass *object_class_by_name(const char *typename) | |
514 | { | |
515 | TypeImpl *type = type_get_by_name(typename); | |
516 | ||
517 | if (!type) { | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | type_class_init(type); | |
522 | ||
523 | return type->class; | |
524 | } | |
525 | ||
526 | typedef struct OCFData | |
527 | { | |
528 | void (*fn)(ObjectClass *klass, void *opaque); | |
93c511a1 AL |
529 | const char *implements_type; |
530 | bool include_abstract; | |
2f28d2ff AL |
531 | void *opaque; |
532 | } OCFData; | |
533 | ||
534 | static void object_class_foreach_tramp(gpointer key, gpointer value, | |
535 | gpointer opaque) | |
536 | { | |
537 | OCFData *data = opaque; | |
538 | TypeImpl *type = value; | |
93c511a1 | 539 | ObjectClass *k; |
2f28d2ff AL |
540 | |
541 | type_class_init(type); | |
93c511a1 | 542 | k = type->class; |
2f28d2ff | 543 | |
93c511a1 AL |
544 | if (!data->include_abstract && type->abstract) { |
545 | return; | |
546 | } | |
547 | ||
548 | if (data->implements_type && | |
549 | !object_class_dynamic_cast(k, data->implements_type)) { | |
550 | return; | |
551 | } | |
552 | ||
553 | data->fn(k, data->opaque); | |
2f28d2ff AL |
554 | } |
555 | ||
556 | void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque), | |
93c511a1 | 557 | const char *implements_type, bool include_abstract, |
2f28d2ff AL |
558 | void *opaque) |
559 | { | |
93c511a1 | 560 | OCFData data = { fn, implements_type, include_abstract, opaque }; |
2f28d2ff AL |
561 | |
562 | g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data); | |
563 | } | |
57c9fafe AL |
564 | |
565 | void object_ref(Object *obj) | |
566 | { | |
567 | obj->ref++; | |
568 | } | |
569 | ||
570 | void object_unref(Object *obj) | |
571 | { | |
572 | g_assert(obj->ref > 0); | |
573 | obj->ref--; | |
574 | ||
575 | /* parent always holds a reference to its children */ | |
576 | if (obj->ref == 0) { | |
577 | object_finalize(obj); | |
578 | } | |
579 | } | |
580 | ||
581 | void object_property_add(Object *obj, const char *name, const char *type, | |
582 | ObjectPropertyAccessor *get, | |
583 | ObjectPropertyAccessor *set, | |
584 | ObjectPropertyRelease *release, | |
585 | void *opaque, Error **errp) | |
586 | { | |
587 | ObjectProperty *prop = g_malloc0(sizeof(*prop)); | |
588 | ||
589 | prop->name = g_strdup(name); | |
590 | prop->type = g_strdup(type); | |
591 | ||
592 | prop->get = get; | |
593 | prop->set = set; | |
594 | prop->release = release; | |
595 | prop->opaque = opaque; | |
596 | ||
597 | QTAILQ_INSERT_TAIL(&obj->properties, prop, node); | |
598 | } | |
599 | ||
600 | static ObjectProperty *object_property_find(Object *obj, const char *name) | |
601 | { | |
602 | ObjectProperty *prop; | |
603 | ||
604 | QTAILQ_FOREACH(prop, &obj->properties, node) { | |
605 | if (strcmp(prop->name, name) == 0) { | |
606 | return prop; | |
607 | } | |
608 | } | |
609 | ||
610 | return NULL; | |
611 | } | |
612 | ||
613 | void object_property_del(Object *obj, const char *name, Error **errp) | |
614 | { | |
615 | ObjectProperty *prop = object_property_find(obj, name); | |
616 | ||
617 | QTAILQ_REMOVE(&obj->properties, prop, node); | |
618 | ||
619 | prop->release(obj, prop->name, prop->opaque); | |
620 | ||
621 | g_free(prop->name); | |
622 | g_free(prop->type); | |
623 | g_free(prop); | |
624 | } | |
625 | ||
626 | void object_property_get(Object *obj, Visitor *v, const char *name, | |
627 | Error **errp) | |
628 | { | |
629 | ObjectProperty *prop = object_property_find(obj, name); | |
630 | ||
631 | if (prop == NULL) { | |
632 | error_set(errp, QERR_PROPERTY_NOT_FOUND, "", name); | |
633 | return; | |
634 | } | |
635 | ||
636 | if (!prop->get) { | |
637 | error_set(errp, QERR_PERMISSION_DENIED); | |
638 | } else { | |
639 | prop->get(obj, v, prop->opaque, name, errp); | |
640 | } | |
641 | } | |
642 | ||
643 | void object_property_set(Object *obj, Visitor *v, const char *name, | |
644 | Error **errp) | |
645 | { | |
646 | ObjectProperty *prop = object_property_find(obj, name); | |
647 | ||
648 | if (prop == NULL) { | |
649 | error_set(errp, QERR_PROPERTY_NOT_FOUND, "", name); | |
650 | return; | |
651 | } | |
652 | ||
653 | if (!prop->set) { | |
654 | error_set(errp, QERR_PERMISSION_DENIED); | |
655 | } else { | |
656 | prop->set(obj, v, prop->opaque, name, errp); | |
657 | } | |
658 | } | |
659 | ||
660 | const char *object_property_get_type(Object *obj, const char *name, Error **errp) | |
661 | { | |
662 | ObjectProperty *prop = object_property_find(obj, name); | |
663 | ||
664 | if (prop == NULL) { | |
665 | error_set(errp, QERR_PROPERTY_NOT_FOUND, "", name); | |
666 | return NULL; | |
667 | } | |
668 | ||
669 | return prop->type; | |
670 | } | |
671 | ||
672 | Object *object_get_root(void) | |
673 | { | |
8b45d447 | 674 | static Object *root; |
57c9fafe | 675 | |
8b45d447 AL |
676 | if (!root) { |
677 | root = object_new("container"); | |
57c9fafe AL |
678 | } |
679 | ||
8b45d447 | 680 | return root; |
57c9fafe AL |
681 | } |
682 | ||
683 | static void object_get_child_property(Object *obj, Visitor *v, void *opaque, | |
684 | const char *name, Error **errp) | |
685 | { | |
686 | Object *child = opaque; | |
687 | gchar *path; | |
688 | ||
689 | path = object_get_canonical_path(child); | |
690 | visit_type_str(v, &path, name, errp); | |
691 | g_free(path); | |
692 | } | |
693 | ||
db85b575 AL |
694 | static void object_finalize_child_property(Object *obj, const char *name, |
695 | void *opaque) | |
696 | { | |
697 | Object *child = opaque; | |
698 | ||
699 | object_unref(child); | |
700 | } | |
701 | ||
57c9fafe AL |
702 | void object_property_add_child(Object *obj, const char *name, |
703 | Object *child, Error **errp) | |
704 | { | |
705 | gchar *type; | |
706 | ||
707 | type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child))); | |
708 | ||
709 | object_property_add(obj, name, type, object_get_child_property, | |
db85b575 | 710 | NULL, object_finalize_child_property, child, errp); |
57c9fafe AL |
711 | |
712 | object_ref(child); | |
713 | g_assert(child->parent == NULL); | |
714 | child->parent = obj; | |
715 | ||
716 | g_free(type); | |
717 | } | |
718 | ||
719 | static void object_get_link_property(Object *obj, Visitor *v, void *opaque, | |
720 | const char *name, Error **errp) | |
721 | { | |
722 | Object **child = opaque; | |
723 | gchar *path; | |
724 | ||
725 | if (*child) { | |
726 | path = object_get_canonical_path(*child); | |
727 | visit_type_str(v, &path, name, errp); | |
728 | g_free(path); | |
729 | } else { | |
730 | path = (gchar *)""; | |
731 | visit_type_str(v, &path, name, errp); | |
732 | } | |
733 | } | |
734 | ||
735 | static void object_set_link_property(Object *obj, Visitor *v, void *opaque, | |
736 | const char *name, Error **errp) | |
737 | { | |
738 | Object **child = opaque; | |
739 | bool ambiguous = false; | |
740 | const char *type; | |
741 | char *path; | |
742 | ||
743 | type = object_property_get_type(obj, name, NULL); | |
744 | ||
745 | visit_type_str(v, &path, name, errp); | |
746 | ||
747 | if (*child) { | |
748 | object_unref(*child); | |
749 | } | |
750 | ||
751 | if (strcmp(path, "") != 0) { | |
752 | Object *target; | |
753 | ||
754 | target = object_resolve_path(path, &ambiguous); | |
755 | if (target) { | |
756 | gchar *target_type; | |
757 | ||
fe40e627 AL |
758 | target_type = g_strdup(&type[5]); |
759 | target_type[strlen(target_type) - 2] = 0; | |
760 | ||
761 | if (object_dynamic_cast(target, target_type)) { | |
57c9fafe | 762 | object_ref(target); |
fe40e627 | 763 | *child = target; |
57c9fafe AL |
764 | } else { |
765 | error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, type); | |
766 | } | |
767 | ||
768 | g_free(target_type); | |
769 | } else { | |
770 | error_set(errp, QERR_DEVICE_NOT_FOUND, path); | |
771 | } | |
772 | } else { | |
773 | *child = NULL; | |
774 | } | |
775 | ||
776 | g_free(path); | |
777 | } | |
778 | ||
779 | void object_property_add_link(Object *obj, const char *name, | |
780 | const char *type, Object **child, | |
781 | Error **errp) | |
782 | { | |
783 | gchar *full_type; | |
784 | ||
785 | full_type = g_strdup_printf("link<%s>", type); | |
786 | ||
787 | object_property_add(obj, name, full_type, | |
788 | object_get_link_property, | |
789 | object_set_link_property, | |
790 | NULL, child, errp); | |
791 | ||
792 | g_free(full_type); | |
793 | } | |
794 | ||
795 | gchar *object_get_canonical_path(Object *obj) | |
796 | { | |
797 | Object *root = object_get_root(); | |
798 | char *newpath = NULL, *path = NULL; | |
799 | ||
800 | while (obj != root) { | |
801 | ObjectProperty *prop = NULL; | |
802 | ||
803 | g_assert(obj->parent != NULL); | |
804 | ||
805 | QTAILQ_FOREACH(prop, &obj->parent->properties, node) { | |
806 | if (!strstart(prop->type, "child<", NULL)) { | |
807 | continue; | |
808 | } | |
809 | ||
810 | if (prop->opaque == obj) { | |
811 | if (path) { | |
812 | newpath = g_strdup_printf("%s/%s", prop->name, path); | |
813 | g_free(path); | |
814 | path = newpath; | |
815 | } else { | |
816 | path = g_strdup(prop->name); | |
817 | } | |
818 | break; | |
819 | } | |
820 | } | |
821 | ||
822 | g_assert(prop != NULL); | |
823 | ||
824 | obj = obj->parent; | |
825 | } | |
826 | ||
827 | newpath = g_strdup_printf("/%s", path); | |
828 | g_free(path); | |
829 | ||
830 | return newpath; | |
831 | } | |
832 | ||
833 | static Object *object_resolve_abs_path(Object *parent, | |
834 | gchar **parts, | |
835 | int index) | |
836 | { | |
837 | ObjectProperty *prop; | |
838 | Object *child; | |
839 | ||
840 | if (parts[index] == NULL) { | |
841 | return parent; | |
842 | } | |
843 | ||
844 | if (strcmp(parts[index], "") == 0) { | |
845 | return object_resolve_abs_path(parent, parts, index + 1); | |
846 | } | |
847 | ||
848 | prop = object_property_find(parent, parts[index]); | |
849 | if (prop == NULL) { | |
850 | return NULL; | |
851 | } | |
852 | ||
853 | child = NULL; | |
854 | if (strstart(prop->type, "link<", NULL)) { | |
855 | Object **pchild = prop->opaque; | |
856 | if (*pchild) { | |
857 | child = *pchild; | |
858 | } | |
859 | } else if (strstart(prop->type, "child<", NULL)) { | |
860 | child = prop->opaque; | |
861 | } | |
862 | ||
863 | if (!child) { | |
864 | return NULL; | |
865 | } | |
866 | ||
867 | return object_resolve_abs_path(child, parts, index + 1); | |
868 | } | |
869 | ||
870 | static Object *object_resolve_partial_path(Object *parent, | |
871 | gchar **parts, | |
872 | bool *ambiguous) | |
873 | { | |
874 | Object *obj; | |
875 | ObjectProperty *prop; | |
876 | ||
877 | obj = object_resolve_abs_path(parent, parts, 0); | |
878 | ||
879 | QTAILQ_FOREACH(prop, &parent->properties, node) { | |
880 | Object *found; | |
881 | ||
882 | if (!strstart(prop->type, "child<", NULL)) { | |
883 | continue; | |
884 | } | |
885 | ||
886 | found = object_resolve_partial_path(prop->opaque, parts, ambiguous); | |
887 | if (found) { | |
888 | if (obj) { | |
889 | if (ambiguous) { | |
890 | *ambiguous = true; | |
891 | } | |
892 | return NULL; | |
893 | } | |
894 | obj = found; | |
895 | } | |
896 | ||
897 | if (ambiguous && *ambiguous) { | |
898 | return NULL; | |
899 | } | |
900 | } | |
901 | ||
902 | return obj; | |
903 | } | |
904 | ||
905 | Object *object_resolve_path(const char *path, bool *ambiguous) | |
906 | { | |
907 | bool partial_path = true; | |
908 | Object *obj; | |
909 | gchar **parts; | |
910 | ||
911 | parts = g_strsplit(path, "/", 0); | |
912 | if (parts == NULL || parts[0] == NULL) { | |
913 | g_strfreev(parts); | |
914 | return object_get_root(); | |
915 | } | |
916 | ||
917 | if (strcmp(parts[0], "") == 0) { | |
918 | partial_path = false; | |
919 | } | |
920 | ||
921 | if (partial_path) { | |
922 | if (ambiguous) { | |
923 | *ambiguous = false; | |
924 | } | |
925 | obj = object_resolve_partial_path(object_get_root(), parts, ambiguous); | |
926 | } else { | |
927 | obj = object_resolve_abs_path(object_get_root(), parts, 1); | |
928 | } | |
929 | ||
930 | g_strfreev(parts); | |
931 | ||
932 | return obj; | |
933 | } | |
934 | ||
935 | typedef struct StringProperty | |
936 | { | |
937 | char *(*get)(Object *, Error **); | |
938 | void (*set)(Object *, const char *, Error **); | |
939 | } StringProperty; | |
940 | ||
941 | static void object_property_get_str(Object *obj, Visitor *v, void *opaque, | |
942 | const char *name, Error **errp) | |
943 | { | |
944 | StringProperty *prop = opaque; | |
945 | char *value; | |
946 | ||
947 | value = prop->get(obj, errp); | |
948 | if (value) { | |
949 | visit_type_str(v, &value, name, errp); | |
950 | g_free(value); | |
951 | } | |
952 | } | |
953 | ||
954 | static void object_property_set_str(Object *obj, Visitor *v, void *opaque, | |
955 | const char *name, Error **errp) | |
956 | { | |
957 | StringProperty *prop = opaque; | |
958 | char *value; | |
959 | Error *local_err = NULL; | |
960 | ||
961 | visit_type_str(v, &value, name, &local_err); | |
962 | if (local_err) { | |
963 | error_propagate(errp, local_err); | |
964 | return; | |
965 | } | |
966 | ||
967 | prop->set(obj, value, errp); | |
968 | g_free(value); | |
969 | } | |
970 | ||
971 | static void object_property_release_str(Object *obj, const char *name, | |
972 | void *opaque) | |
973 | { | |
974 | StringProperty *prop = opaque; | |
975 | g_free(prop); | |
976 | } | |
977 | ||
978 | void object_property_add_str(Object *obj, const char *name, | |
979 | char *(*get)(Object *, Error **), | |
980 | void (*set)(Object *, const char *, Error **), | |
981 | Error **errp) | |
982 | { | |
983 | StringProperty *prop = g_malloc0(sizeof(*prop)); | |
984 | ||
985 | prop->get = get; | |
986 | prop->set = set; | |
987 | ||
988 | object_property_add(obj, name, "string", | |
989 | get ? object_property_get_str : NULL, | |
990 | set ? object_property_set_str : NULL, | |
991 | object_property_release_str, | |
992 | prop, errp); | |
993 | } |