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" 15 #include "qapi/qapi-visit-core.h" 16 #include "qapi/string-input-visitor.h" 17 #include "qapi/string-output-visitor.h" 18 19 /* TODO: replace QObject with a simpler visitor to avoid a dependency 20 * of the QOM core on QObject? */ 21 #include "qemu/qom-qobject.h" 22 #include "qobject.h" 23 #include "qbool.h" 24 #include "qint.h" 25 #include "qstring.h" 26 27 #define MAX_INTERFACES 32 28 29 typedef struct InterfaceImpl InterfaceImpl; 30 typedef struct TypeImpl TypeImpl; 31 32 struct InterfaceImpl 33 { 34 const char *parent; 35 void (*interface_initfn)(ObjectClass *class, void *data); 36 TypeImpl *type; 37 }; 38 39 struct TypeImpl 40 { 41 const char *name; 42 43 size_t class_size; 44 45 size_t instance_size; 46 47 void (*class_init)(ObjectClass *klass, void *data); 48 void (*class_finalize)(ObjectClass *klass, void *data); 49 50 void *class_data; 51 52 void (*instance_init)(Object *obj); 53 void (*instance_finalize)(Object *obj); 54 55 bool abstract; 56 57 const char *parent; 58 TypeImpl *parent_type; 59 60 ObjectClass *class; 61 62 int num_interfaces; 63 InterfaceImpl interfaces[MAX_INTERFACES]; 64 }; 65 66 typedef struct Interface 67 { 68 Object parent; 69 Object *obj; 70 } Interface; 71 72 #define INTERFACE(obj) OBJECT_CHECK(Interface, obj, TYPE_INTERFACE) 73 74 static Type type_interface; 75 76 static GHashTable *type_table_get(void) 77 { 78 static GHashTable *type_table; 79 80 if (type_table == NULL) { 81 type_table = g_hash_table_new(g_str_hash, g_str_equal); 82 } 83 84 return type_table; 85 } 86 87 static void type_table_add(TypeImpl *ti) 88 { 89 g_hash_table_insert(type_table_get(), (void *)ti->name, ti); 90 } 91 92 static TypeImpl *type_table_lookup(const char *name) 93 { 94 return g_hash_table_lookup(type_table_get(), name); 95 } 96 97 TypeImpl *type_register(const TypeInfo *info) 98 { 99 TypeImpl *ti = g_malloc0(sizeof(*ti)); 100 101 g_assert(info->name != NULL); 102 103 if (type_table_lookup(info->name) != NULL) { 104 fprintf(stderr, "Registering `%s' which already exists\n", info->name); 105 abort(); 106 } 107 108 ti->name = g_strdup(info->name); 109 ti->parent = g_strdup(info->parent); 110 111 ti->class_size = info->class_size; 112 ti->instance_size = info->instance_size; 113 114 ti->class_init = info->class_init; 115 ti->class_finalize = info->class_finalize; 116 ti->class_data = info->class_data; 117 118 ti->instance_init = info->instance_init; 119 ti->instance_finalize = info->instance_finalize; 120 121 ti->abstract = info->abstract; 122 123 if (info->interfaces) { 124 int i; 125 126 for (i = 0; info->interfaces[i].type; i++) { 127 ti->interfaces[i].parent = info->interfaces[i].type; 128 ti->interfaces[i].interface_initfn = info->interfaces[i].interface_initfn; 129 ti->num_interfaces++; 130 } 131 } 132 133 type_table_add(ti); 134 135 return ti; 136 } 137 138 TypeImpl *type_register_static(const TypeInfo *info) 139 { 140 return type_register(info); 141 } 142 143 static TypeImpl *type_get_by_name(const char *name) 144 { 145 if (name == NULL) { 146 return NULL; 147 } 148 149 return type_table_lookup(name); 150 } 151 152 static TypeImpl *type_get_parent(TypeImpl *type) 153 { 154 if (!type->parent_type && type->parent) { 155 type->parent_type = type_get_by_name(type->parent); 156 g_assert(type->parent_type != NULL); 157 } 158 159 return type->parent_type; 160 } 161 162 static bool type_has_parent(TypeImpl *type) 163 { 164 return (type->parent != NULL); 165 } 166 167 static size_t type_class_get_size(TypeImpl *ti) 168 { 169 if (ti->class_size) { 170 return ti->class_size; 171 } 172 173 if (type_has_parent(ti)) { 174 return type_class_get_size(type_get_parent(ti)); 175 } 176 177 return sizeof(ObjectClass); 178 } 179 180 static void type_class_interface_init(TypeImpl *ti, InterfaceImpl *iface) 181 { 182 TypeInfo info = { 183 .instance_size = sizeof(Interface), 184 .parent = iface->parent, 185 .class_size = sizeof(InterfaceClass), 186 .class_init = iface->interface_initfn, 187 .abstract = true, 188 }; 189 char *name = g_strdup_printf("<%s::%s>", ti->name, iface->parent); 190 191 info.name = name; 192 iface->type = type_register(&info); 193 g_free(name); 194 } 195 196 static void type_class_init(TypeImpl *ti) 197 { 198 size_t class_size = sizeof(ObjectClass); 199 int i; 200 201 if (ti->class) { 202 return; 203 } 204 205 ti->class_size = type_class_get_size(ti); 206 207 ti->class = g_malloc0(ti->class_size); 208 ti->class->type = ti; 209 210 if (type_has_parent(ti)) { 211 TypeImpl *parent = type_get_parent(ti); 212 213 type_class_init(parent); 214 215 class_size = parent->class_size; 216 g_assert(parent->class_size <= ti->class_size); 217 218 memcpy((void *)ti->class + sizeof(ObjectClass), 219 (void *)parent->class + sizeof(ObjectClass), 220 parent->class_size - sizeof(ObjectClass)); 221 } 222 223 memset((void *)ti->class + class_size, 0, ti->class_size - class_size); 224 225 for (i = 0; i < ti->num_interfaces; i++) { 226 type_class_interface_init(ti, &ti->interfaces[i]); 227 } 228 229 if (ti->class_init) { 230 ti->class_init(ti->class, ti->class_data); 231 } 232 } 233 234 static void object_interface_init(Object *obj, InterfaceImpl *iface) 235 { 236 TypeImpl *ti = iface->type; 237 Interface *iface_obj; 238 239 iface_obj = INTERFACE(object_new(ti->name)); 240 iface_obj->obj = obj; 241 242 obj->interfaces = g_slist_prepend(obj->interfaces, iface_obj); 243 } 244 245 static void object_init_with_type(Object *obj, TypeImpl *ti) 246 { 247 int i; 248 249 if (type_has_parent(ti)) { 250 object_init_with_type(obj, type_get_parent(ti)); 251 } 252 253 for (i = 0; i < ti->num_interfaces; i++) { 254 object_interface_init(obj, &ti->interfaces[i]); 255 } 256 257 if (ti->instance_init) { 258 ti->instance_init(obj); 259 } 260 } 261 262 void object_initialize_with_type(void *data, TypeImpl *type) 263 { 264 Object *obj = data; 265 266 g_assert(type != NULL); 267 g_assert(type->instance_size >= sizeof(Object)); 268 269 type_class_init(type); 270 g_assert(type->abstract == false); 271 272 memset(obj, 0, type->instance_size); 273 obj->class = type->class; 274 QTAILQ_INIT(&obj->properties); 275 object_init_with_type(obj, type); 276 } 277 278 void object_initialize(void *data, const char *typename) 279 { 280 TypeImpl *type = type_get_by_name(typename); 281 282 object_initialize_with_type(data, type); 283 } 284 285 static void object_property_del_all(Object *obj) 286 { 287 while (!QTAILQ_EMPTY(&obj->properties)) { 288 ObjectProperty *prop = QTAILQ_FIRST(&obj->properties); 289 290 QTAILQ_REMOVE(&obj->properties, prop, node); 291 292 if (prop->release) { 293 prop->release(obj, prop->name, prop->opaque); 294 } 295 296 g_free(prop->name); 297 g_free(prop->type); 298 g_free(prop); 299 } 300 } 301 302 static void object_property_del_child(Object *obj, Object *child, Error **errp) 303 { 304 ObjectProperty *prop; 305 306 QTAILQ_FOREACH(prop, &obj->properties, node) { 307 if (strstart(prop->type, "child<", NULL) && prop->opaque == child) { 308 object_property_del(obj, prop->name, errp); 309 break; 310 } 311 } 312 } 313 314 void object_unparent(Object *obj) 315 { 316 if (obj->parent) { 317 object_property_del_child(obj->parent, obj, NULL); 318 } 319 } 320 321 static void object_deinit(Object *obj, TypeImpl *type) 322 { 323 if (type->instance_finalize) { 324 type->instance_finalize(obj); 325 } 326 327 while (obj->interfaces) { 328 Interface *iface_obj = obj->interfaces->data; 329 obj->interfaces = g_slist_delete_link(obj->interfaces, obj->interfaces); 330 object_delete(OBJECT(iface_obj)); 331 } 332 333 if (type_has_parent(type)) { 334 object_deinit(obj, type_get_parent(type)); 335 } 336 337 object_unparent(obj); 338 } 339 340 void object_finalize(void *data) 341 { 342 Object *obj = data; 343 TypeImpl *ti = obj->class->type; 344 345 object_deinit(obj, ti); 346 object_property_del_all(obj); 347 348 g_assert(obj->ref == 0); 349 } 350 351 Object *object_new_with_type(Type type) 352 { 353 Object *obj; 354 355 g_assert(type != NULL); 356 357 obj = g_malloc(type->instance_size); 358 object_initialize_with_type(obj, type); 359 object_ref(obj); 360 361 return obj; 362 } 363 364 Object *object_new(const char *typename) 365 { 366 TypeImpl *ti = type_get_by_name(typename); 367 368 return object_new_with_type(ti); 369 } 370 371 void object_delete(Object *obj) 372 { 373 object_unref(obj); 374 g_assert(obj->ref == 0); 375 g_free(obj); 376 } 377 378 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type) 379 { 380 assert(target_type); 381 382 /* Check if typename is a direct ancestor of type */ 383 while (type) { 384 if (type == target_type) { 385 return true; 386 } 387 388 type = type_get_parent(type); 389 } 390 391 return false; 392 } 393 394 static bool object_is_type(Object *obj, TypeImpl *target_type) 395 { 396 return !target_type || type_is_ancestor(obj->class->type, target_type); 397 } 398 399 Object *object_dynamic_cast(Object *obj, const char *typename) 400 { 401 TypeImpl *target_type = type_get_by_name(typename); 402 GSList *i; 403 404 /* Check if typename is a direct ancestor. Special-case TYPE_OBJECT, 405 * we want to go back from interfaces to the parent. 406 */ 407 if (target_type && object_is_type(obj, target_type)) { 408 return obj; 409 } 410 411 /* Check if obj is an interface and its containing object is a direct 412 * ancestor of typename. In principle we could do this test at the very 413 * beginning of object_dynamic_cast, avoiding a second call to 414 * object_is_type. However, casting between interfaces is relatively 415 * rare, and object_is_type(obj, type_interface) would fail almost always. 416 * 417 * Perhaps we could add a magic value to the object header for increased 418 * (run-time) type safety and to speed up tests like this one. If we ever 419 * do that we can revisit the order here. 420 */ 421 if (object_is_type(obj, type_interface)) { 422 assert(!obj->interfaces); 423 obj = INTERFACE(obj)->obj; 424 if (object_is_type(obj, target_type)) { 425 return obj; 426 } 427 } 428 429 if (!target_type) { 430 return obj; 431 } 432 433 /* Check if obj has an interface of typename */ 434 for (i = obj->interfaces; i; i = i->next) { 435 Interface *iface = i->data; 436 437 if (object_is_type(OBJECT(iface), target_type)) { 438 return OBJECT(iface); 439 } 440 } 441 442 return NULL; 443 } 444 445 446 static void register_types(void) 447 { 448 static TypeInfo interface_info = { 449 .name = TYPE_INTERFACE, 450 .instance_size = sizeof(Interface), 451 .abstract = true, 452 }; 453 454 type_interface = type_register_static(&interface_info); 455 } 456 457 type_init(register_types) 458 459 Object *object_dynamic_cast_assert(Object *obj, const char *typename) 460 { 461 Object *inst; 462 463 inst = object_dynamic_cast(obj, typename); 464 465 if (!inst) { 466 fprintf(stderr, "Object %p is not an instance of type %s\n", 467 obj, typename); 468 abort(); 469 } 470 471 return inst; 472 } 473 474 ObjectClass *object_class_dynamic_cast(ObjectClass *class, 475 const char *typename) 476 { 477 TypeImpl *target_type = type_get_by_name(typename); 478 TypeImpl *type = class->type; 479 480 while (type) { 481 if (type == target_type) { 482 return class; 483 } 484 485 type = type_get_parent(type); 486 } 487 488 return NULL; 489 } 490 491 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class, 492 const char *typename) 493 { 494 ObjectClass *ret = object_class_dynamic_cast(class, typename); 495 496 if (!ret) { 497 fprintf(stderr, "Object %p is not an instance of type %s\n", 498 class, typename); 499 abort(); 500 } 501 502 return ret; 503 } 504 505 const char *object_get_typename(Object *obj) 506 { 507 return obj->class->type->name; 508 } 509 510 ObjectClass *object_get_class(Object *obj) 511 { 512 return obj->class; 513 } 514 515 const char *object_class_get_name(ObjectClass *klass) 516 { 517 return klass->type->name; 518 } 519 520 ObjectClass *object_class_by_name(const char *typename) 521 { 522 TypeImpl *type = type_get_by_name(typename); 523 524 if (!type) { 525 return NULL; 526 } 527 528 type_class_init(type); 529 530 return type->class; 531 } 532 533 typedef struct OCFData 534 { 535 void (*fn)(ObjectClass *klass, void *opaque); 536 const char *implements_type; 537 bool include_abstract; 538 void *opaque; 539 } OCFData; 540 541 static void object_class_foreach_tramp(gpointer key, gpointer value, 542 gpointer opaque) 543 { 544 OCFData *data = opaque; 545 TypeImpl *type = value; 546 ObjectClass *k; 547 548 type_class_init(type); 549 k = type->class; 550 551 if (!data->include_abstract && type->abstract) { 552 return; 553 } 554 555 if (data->implements_type && 556 !object_class_dynamic_cast(k, data->implements_type)) { 557 return; 558 } 559 560 data->fn(k, data->opaque); 561 } 562 563 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque), 564 const char *implements_type, bool include_abstract, 565 void *opaque) 566 { 567 OCFData data = { fn, implements_type, include_abstract, opaque }; 568 569 g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data); 570 } 571 572 void object_ref(Object *obj) 573 { 574 obj->ref++; 575 } 576 577 void object_unref(Object *obj) 578 { 579 g_assert(obj->ref > 0); 580 obj->ref--; 581 582 /* parent always holds a reference to its children */ 583 if (obj->ref == 0) { 584 object_finalize(obj); 585 } 586 } 587 588 void object_property_add(Object *obj, const char *name, const char *type, 589 ObjectPropertyAccessor *get, 590 ObjectPropertyAccessor *set, 591 ObjectPropertyRelease *release, 592 void *opaque, Error **errp) 593 { 594 ObjectProperty *prop = g_malloc0(sizeof(*prop)); 595 596 prop->name = g_strdup(name); 597 prop->type = g_strdup(type); 598 599 prop->get = get; 600 prop->set = set; 601 prop->release = release; 602 prop->opaque = opaque; 603 604 QTAILQ_INSERT_TAIL(&obj->properties, prop, node); 605 } 606 607 static ObjectProperty *object_property_find(Object *obj, const char *name) 608 { 609 ObjectProperty *prop; 610 611 QTAILQ_FOREACH(prop, &obj->properties, node) { 612 if (strcmp(prop->name, name) == 0) { 613 return prop; 614 } 615 } 616 617 return NULL; 618 } 619 620 void object_property_del(Object *obj, const char *name, Error **errp) 621 { 622 ObjectProperty *prop = object_property_find(obj, name); 623 624 QTAILQ_REMOVE(&obj->properties, prop, node); 625 626 prop->release(obj, prop->name, prop->opaque); 627 628 g_free(prop->name); 629 g_free(prop->type); 630 g_free(prop); 631 } 632 633 void object_property_get(Object *obj, Visitor *v, const char *name, 634 Error **errp) 635 { 636 ObjectProperty *prop = object_property_find(obj, name); 637 638 if (prop == NULL) { 639 error_set(errp, QERR_PROPERTY_NOT_FOUND, "", name); 640 return; 641 } 642 643 if (!prop->get) { 644 error_set(errp, QERR_PERMISSION_DENIED); 645 } else { 646 prop->get(obj, v, prop->opaque, name, errp); 647 } 648 } 649 650 void object_property_set(Object *obj, Visitor *v, const char *name, 651 Error **errp) 652 { 653 ObjectProperty *prop = object_property_find(obj, name); 654 655 if (prop == NULL) { 656 error_set(errp, QERR_PROPERTY_NOT_FOUND, "", name); 657 return; 658 } 659 660 if (!prop->set) { 661 error_set(errp, QERR_PERMISSION_DENIED); 662 } else { 663 prop->set(obj, v, prop->opaque, name, errp); 664 } 665 } 666 667 void object_property_set_str(Object *obj, const char *value, 668 const char *name, Error **errp) 669 { 670 QString *qstr = qstring_from_str(value); 671 object_property_set_qobject(obj, QOBJECT(qstr), name, errp); 672 673 QDECREF(qstr); 674 } 675 676 char *object_property_get_str(Object *obj, const char *name, 677 Error **errp) 678 { 679 QObject *ret = object_property_get_qobject(obj, name, errp); 680 QString *qstring; 681 char *retval; 682 683 if (!ret) { 684 return NULL; 685 } 686 qstring = qobject_to_qstring(ret); 687 if (!qstring) { 688 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "string"); 689 retval = NULL; 690 } else { 691 retval = g_strdup(qstring_get_str(qstring)); 692 } 693 694 QDECREF(qstring); 695 return retval; 696 } 697 698 void object_property_set_link(Object *obj, Object *value, 699 const char *name, Error **errp) 700 { 701 object_property_set_str(obj, object_get_canonical_path(value), 702 name, errp); 703 } 704 705 Object *object_property_get_link(Object *obj, const char *name, 706 Error **errp) 707 { 708 char *str = object_property_get_str(obj, name, errp); 709 Object *target = NULL; 710 711 if (str && *str) { 712 target = object_resolve_path(str, NULL); 713 if (!target) { 714 error_set(errp, QERR_DEVICE_NOT_FOUND, str); 715 } 716 } 717 718 g_free(str); 719 return target; 720 } 721 722 void object_property_set_bool(Object *obj, bool value, 723 const char *name, Error **errp) 724 { 725 QBool *qbool = qbool_from_int(value); 726 object_property_set_qobject(obj, QOBJECT(qbool), name, errp); 727 728 QDECREF(qbool); 729 } 730 731 bool object_property_get_bool(Object *obj, const char *name, 732 Error **errp) 733 { 734 QObject *ret = object_property_get_qobject(obj, name, errp); 735 QBool *qbool; 736 bool retval; 737 738 if (!ret) { 739 return false; 740 } 741 qbool = qobject_to_qbool(ret); 742 if (!qbool) { 743 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean"); 744 retval = false; 745 } else { 746 retval = qbool_get_int(qbool); 747 } 748 749 QDECREF(qbool); 750 return retval; 751 } 752 753 void object_property_set_int(Object *obj, int64_t value, 754 const char *name, Error **errp) 755 { 756 QInt *qint = qint_from_int(value); 757 object_property_set_qobject(obj, QOBJECT(qint), name, errp); 758 759 QDECREF(qint); 760 } 761 762 int64_t object_property_get_int(Object *obj, const char *name, 763 Error **errp) 764 { 765 QObject *ret = object_property_get_qobject(obj, name, errp); 766 QInt *qint; 767 int64_t retval; 768 769 if (!ret) { 770 return -1; 771 } 772 qint = qobject_to_qint(ret); 773 if (!qint) { 774 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "int"); 775 retval = -1; 776 } else { 777 retval = qint_get_int(qint); 778 } 779 780 QDECREF(qint); 781 return retval; 782 } 783 784 void object_property_parse(Object *obj, const char *string, 785 const char *name, Error **errp) 786 { 787 StringInputVisitor *mi; 788 mi = string_input_visitor_new(string); 789 object_property_set(obj, string_input_get_visitor(mi), name, errp); 790 791 string_input_visitor_cleanup(mi); 792 } 793 794 char *object_property_print(Object *obj, const char *name, 795 Error **errp) 796 { 797 StringOutputVisitor *mo; 798 char *string; 799 800 mo = string_output_visitor_new(); 801 object_property_get(obj, string_output_get_visitor(mo), name, NULL); 802 string = string_output_get_string(mo); 803 string_output_visitor_cleanup(mo); 804 return string; 805 } 806 807 const char *object_property_get_type(Object *obj, const char *name, Error **errp) 808 { 809 ObjectProperty *prop = object_property_find(obj, name); 810 811 if (prop == NULL) { 812 error_set(errp, QERR_PROPERTY_NOT_FOUND, "", name); 813 return NULL; 814 } 815 816 return prop->type; 817 } 818 819 Object *object_get_root(void) 820 { 821 static Object *root; 822 823 if (!root) { 824 root = object_new("container"); 825 } 826 827 return root; 828 } 829 830 static void object_get_child_property(Object *obj, Visitor *v, void *opaque, 831 const char *name, Error **errp) 832 { 833 Object *child = opaque; 834 gchar *path; 835 836 path = object_get_canonical_path(child); 837 visit_type_str(v, &path, name, errp); 838 g_free(path); 839 } 840 841 static void object_finalize_child_property(Object *obj, const char *name, 842 void *opaque) 843 { 844 Object *child = opaque; 845 846 object_unref(child); 847 } 848 849 void object_property_add_child(Object *obj, const char *name, 850 Object *child, Error **errp) 851 { 852 gchar *type; 853 854 /* Registering an interface object in the composition tree will mightily 855 * confuse object_get_canonical_path (which, on the other hand, knows how 856 * to get the canonical path of an interface object). 857 */ 858 assert(!object_is_type(obj, type_interface)); 859 860 type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child))); 861 862 object_property_add(obj, name, type, object_get_child_property, 863 NULL, object_finalize_child_property, child, errp); 864 865 object_ref(child); 866 g_assert(child->parent == NULL); 867 child->parent = obj; 868 869 g_free(type); 870 } 871 872 static void object_get_link_property(Object *obj, Visitor *v, void *opaque, 873 const char *name, Error **errp) 874 { 875 Object **child = opaque; 876 gchar *path; 877 878 if (*child) { 879 path = object_get_canonical_path(*child); 880 visit_type_str(v, &path, name, errp); 881 g_free(path); 882 } else { 883 path = (gchar *)""; 884 visit_type_str(v, &path, name, errp); 885 } 886 } 887 888 static void object_set_link_property(Object *obj, Visitor *v, void *opaque, 889 const char *name, Error **errp) 890 { 891 Object **child = opaque; 892 Object *old_target; 893 bool ambiguous = false; 894 const char *type; 895 char *path; 896 gchar *target_type; 897 898 type = object_property_get_type(obj, name, NULL); 899 900 visit_type_str(v, &path, name, errp); 901 902 old_target = *child; 903 *child = NULL; 904 905 if (strcmp(path, "") != 0) { 906 Object *target; 907 908 /* Go from link<FOO> to FOO. */ 909 target_type = g_strndup(&type[5], strlen(type) - 6); 910 target = object_resolve_path_type(path, target_type, &ambiguous); 911 912 if (ambiguous) { 913 error_set(errp, QERR_AMBIGUOUS_PATH, path); 914 } else if (target) { 915 object_ref(target); 916 *child = target; 917 } else { 918 target = object_resolve_path(path, &ambiguous); 919 if (target || ambiguous) { 920 error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type); 921 } else { 922 error_set(errp, QERR_DEVICE_NOT_FOUND, path); 923 } 924 } 925 g_free(target_type); 926 } 927 928 g_free(path); 929 930 if (old_target != NULL) { 931 object_unref(old_target); 932 } 933 } 934 935 void object_property_add_link(Object *obj, const char *name, 936 const char *type, Object **child, 937 Error **errp) 938 { 939 gchar *full_type; 940 941 full_type = g_strdup_printf("link<%s>", type); 942 943 object_property_add(obj, name, full_type, 944 object_get_link_property, 945 object_set_link_property, 946 NULL, child, errp); 947 948 g_free(full_type); 949 } 950 951 gchar *object_get_canonical_path(Object *obj) 952 { 953 Object *root = object_get_root(); 954 char *newpath = NULL, *path = NULL; 955 956 if (object_is_type(obj, type_interface)) { 957 obj = INTERFACE(obj)->obj; 958 } 959 960 while (obj != root) { 961 ObjectProperty *prop = NULL; 962 963 g_assert(obj->parent != NULL); 964 965 QTAILQ_FOREACH(prop, &obj->parent->properties, node) { 966 if (!strstart(prop->type, "child<", NULL)) { 967 continue; 968 } 969 970 if (prop->opaque == obj) { 971 if (path) { 972 newpath = g_strdup_printf("%s/%s", prop->name, path); 973 g_free(path); 974 path = newpath; 975 } else { 976 path = g_strdup(prop->name); 977 } 978 break; 979 } 980 } 981 982 g_assert(prop != NULL); 983 984 obj = obj->parent; 985 } 986 987 newpath = g_strdup_printf("/%s", path); 988 g_free(path); 989 990 return newpath; 991 } 992 993 static Object *object_resolve_abs_path(Object *parent, 994 gchar **parts, 995 const char *typename, 996 int index) 997 { 998 ObjectProperty *prop; 999 Object *child; 1000 1001 if (parts[index] == NULL) { 1002 return object_dynamic_cast(parent, typename); 1003 } 1004 1005 if (strcmp(parts[index], "") == 0) { 1006 return object_resolve_abs_path(parent, parts, typename, index + 1); 1007 } 1008 1009 prop = object_property_find(parent, parts[index]); 1010 if (prop == NULL) { 1011 return NULL; 1012 } 1013 1014 child = NULL; 1015 if (strstart(prop->type, "link<", NULL)) { 1016 Object **pchild = prop->opaque; 1017 if (*pchild) { 1018 child = *pchild; 1019 } 1020 } else if (strstart(prop->type, "child<", NULL)) { 1021 child = prop->opaque; 1022 } 1023 1024 if (!child) { 1025 return NULL; 1026 } 1027 1028 return object_resolve_abs_path(child, parts, typename, index + 1); 1029 } 1030 1031 static Object *object_resolve_partial_path(Object *parent, 1032 gchar **parts, 1033 const char *typename, 1034 bool *ambiguous) 1035 { 1036 Object *obj; 1037 ObjectProperty *prop; 1038 1039 obj = object_resolve_abs_path(parent, parts, typename, 0); 1040 1041 QTAILQ_FOREACH(prop, &parent->properties, node) { 1042 Object *found; 1043 1044 if (!strstart(prop->type, "child<", NULL)) { 1045 continue; 1046 } 1047 1048 found = object_resolve_partial_path(prop->opaque, parts, 1049 typename, ambiguous); 1050 if (found) { 1051 if (obj) { 1052 if (ambiguous) { 1053 *ambiguous = true; 1054 } 1055 return NULL; 1056 } 1057 obj = found; 1058 } 1059 1060 if (ambiguous && *ambiguous) { 1061 return NULL; 1062 } 1063 } 1064 1065 return obj; 1066 } 1067 1068 Object *object_resolve_path_type(const char *path, const char *typename, 1069 bool *ambiguous) 1070 { 1071 bool partial_path = true; 1072 Object *obj; 1073 gchar **parts; 1074 1075 parts = g_strsplit(path, "/", 0); 1076 if (parts == NULL || parts[0] == NULL) { 1077 g_strfreev(parts); 1078 return object_get_root(); 1079 } 1080 1081 if (strcmp(parts[0], "") == 0) { 1082 partial_path = false; 1083 } 1084 1085 if (partial_path) { 1086 if (ambiguous) { 1087 *ambiguous = false; 1088 } 1089 obj = object_resolve_partial_path(object_get_root(), parts, 1090 typename, ambiguous); 1091 } else { 1092 obj = object_resolve_abs_path(object_get_root(), parts, typename, 1); 1093 } 1094 1095 g_strfreev(parts); 1096 1097 return obj; 1098 } 1099 1100 Object *object_resolve_path(const char *path, bool *ambiguous) 1101 { 1102 return object_resolve_path_type(path, TYPE_OBJECT, ambiguous); 1103 } 1104 1105 typedef struct StringProperty 1106 { 1107 char *(*get)(Object *, Error **); 1108 void (*set)(Object *, const char *, Error **); 1109 } StringProperty; 1110 1111 static void property_get_str(Object *obj, Visitor *v, void *opaque, 1112 const char *name, Error **errp) 1113 { 1114 StringProperty *prop = opaque; 1115 char *value; 1116 1117 value = prop->get(obj, errp); 1118 if (value) { 1119 visit_type_str(v, &value, name, errp); 1120 g_free(value); 1121 } 1122 } 1123 1124 static void property_set_str(Object *obj, Visitor *v, void *opaque, 1125 const char *name, Error **errp) 1126 { 1127 StringProperty *prop = opaque; 1128 char *value; 1129 Error *local_err = NULL; 1130 1131 visit_type_str(v, &value, name, &local_err); 1132 if (local_err) { 1133 error_propagate(errp, local_err); 1134 return; 1135 } 1136 1137 prop->set(obj, value, errp); 1138 g_free(value); 1139 } 1140 1141 static void property_release_str(Object *obj, const char *name, 1142 void *opaque) 1143 { 1144 StringProperty *prop = opaque; 1145 g_free(prop); 1146 } 1147 1148 void object_property_add_str(Object *obj, const char *name, 1149 char *(*get)(Object *, Error **), 1150 void (*set)(Object *, const char *, Error **), 1151 Error **errp) 1152 { 1153 StringProperty *prop = g_malloc0(sizeof(*prop)); 1154 1155 prop->get = get; 1156 prop->set = set; 1157 1158 object_property_add(obj, name, "string", 1159 get ? property_get_str : NULL, 1160 set ? property_set_str : NULL, 1161 property_release_str, 1162 prop, errp); 1163 } 1164