qom/object.c

   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/osdep.h"
  14 #include "hw/qdev-core.h"
  15 #include "qapi/error.h"
  16 #include "qom/object.h"
  17 #include "qom/object_interfaces.h"
  18 #include "qemu/cutils.h"
  19 #include "qapi/visitor.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qobject-input-visitor.h"
  23 #include "qapi/qapi-builtin-visit.h"
  24 #include "qapi/qmp/qerror.h"
  25 #include "qapi/qmp/qjson.h"
  26 #include "trace.h"
  27
  28 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  29  * of the QOM core on QObject?  */
  30 #include "qom/qom-qobject.h"
  31 #include "qapi/qmp/qbool.h"
  32 #include "qapi/qmp/qnum.h"
  33 #include "qapi/qmp/qstring.h"
  34 #include "qemu/error-report.h"
  35
  36 #define MAX_INTERFACES 32
  37
  38 typedef struct InterfaceImpl InterfaceImpl;
  39 typedef struct TypeImpl TypeImpl;
  40
  41 struct InterfaceImpl
  42 {
  43     const char *typename;
  44 };
  45
  46 struct TypeImpl
  47 {
  48     const char *name;
  49
  50     size_t class_size;
  51
  52     size_t instance_size;
  53
  54     void (*class_init)(ObjectClass *klass, void *data);
  55     void (*class_base_init)(ObjectClass *klass, void *data);
  56
  57     void *class_data;
  58
  59     void (*instance_init)(Object *obj);
  60     void (*instance_post_init)(Object *obj);
  61     void (*instance_finalize)(Object *obj);
  62
  63     bool abstract;
  64
  65     const char *parent;
  66     TypeImpl *parent_type;
  67
  68     ObjectClass *class;
  69
  70     int num_interfaces;
  71     InterfaceImpl interfaces[MAX_INTERFACES];
  72 };
  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 bool enumerating_types;
  88
  89 static void type_table_add(TypeImpl *ti)
  90 {
  91     assert(!enumerating_types);
  92     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  93 }
  94
  95 static TypeImpl *type_table_lookup(const char *name)
  96 {
  97     return g_hash_table_lookup(type_table_get(), name);
  98 }
  99
 100 static TypeImpl *type_new(const TypeInfo *info)
 101 {
 102     TypeImpl *ti = g_malloc0(sizeof(*ti));
 103     int i;
 104
 105     g_assert(info->name != NULL);
 106
 107     if (type_table_lookup(info->name) != NULL) {
 108         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 109         abort();
 110     }
 111
 112     ti->name = g_strdup(info->name);
 113     ti->parent = g_strdup(info->parent);
 114
 115     ti->class_size = info->class_size;
 116     ti->instance_size = info->instance_size;
 117
 118     ti->class_init = info->class_init;
 119     ti->class_base_init = info->class_base_init;
 120     ti->class_data = info->class_data;
 121
 122     ti->instance_init = info->instance_init;
 123     ti->instance_post_init = info->instance_post_init;
 124     ti->instance_finalize = info->instance_finalize;
 125
 126     ti->abstract = info->abstract;
 127
 128     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 129         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 130     }
 131     ti->num_interfaces = i;
 132
 133     return ti;
 134 }
 135
 136 static TypeImpl *type_register_internal(const TypeInfo *info)
 137 {
 138     TypeImpl *ti;
 139     ti = type_new(info);
 140
 141     type_table_add(ti);
 142     return ti;
 143 }
 144
 145 TypeImpl *type_register(const TypeInfo *info)
 146 {
 147     assert(info->parent);
 148     return type_register_internal(info);
 149 }
 150
 151 TypeImpl *type_register_static(const TypeInfo *info)
 152 {
 153     return type_register(info);
 154 }
 155
 156 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 157 {
 158     int i;
 159
 160     for (i = 0; i < nr_infos; i++) {
 161         type_register_static(&infos[i]);
 162     }
 163 }
 164
 165 static TypeImpl *type_get_by_name(const char *name)
 166 {
 167     if (name == NULL) {
 168         return NULL;
 169     }
 170
 171     return type_table_lookup(name);
 172 }
 173
 174 static TypeImpl *type_get_parent(TypeImpl *type)
 175 {
 176     if (!type->parent_type && type->parent) {
 177         type->parent_type = type_get_by_name(type->parent);
 178         if (!type->parent_type) {
 179             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
 180                     type->name, type->parent);
 181             abort();
 182         }
 183     }
 184
 185     return type->parent_type;
 186 }
 187
 188 static bool type_has_parent(TypeImpl *type)
 189 {
 190     return (type->parent != NULL);
 191 }
 192
 193 static size_t type_class_get_size(TypeImpl *ti)
 194 {
 195     if (ti->class_size) {
 196         return ti->class_size;
 197     }
 198
 199     if (type_has_parent(ti)) {
 200         return type_class_get_size(type_get_parent(ti));
 201     }
 202
 203     return sizeof(ObjectClass);
 204 }
 205
 206 static size_t type_object_get_size(TypeImpl *ti)
 207 {
 208     if (ti->instance_size) {
 209         return ti->instance_size;
 210     }
 211
 212     if (type_has_parent(ti)) {
 213         return type_object_get_size(type_get_parent(ti));
 214     }
 215
 216     return 0;
 217 }
 218
 219 size_t object_type_get_instance_size(const char *typename)
 220 {
 221     TypeImpl *type = type_get_by_name(typename);
 222
 223     g_assert(type != NULL);
 224     return type_object_get_size(type);
 225 }
 226
 227 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 228 {
 229     assert(target_type);
 230
 231     /* Check if target_type is a direct ancestor of type */
 232     while (type) {
 233         if (type == target_type) {
 234             return true;
 235         }
 236
 237         type = type_get_parent(type);
 238     }
 239
 240     return false;
 241 }
 242
 243 static void type_initialize(TypeImpl *ti);
 244
 245 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 246                                       TypeImpl *parent_type)
 247 {
 248     InterfaceClass *new_iface;
 249     TypeInfo info = { };
 250     TypeImpl *iface_impl;
 251
 252     info.parent = parent_type->name;
 253     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 254     info.abstract = true;
 255
 256     iface_impl = type_new(&info);
 257     iface_impl->parent_type = parent_type;
 258     type_initialize(iface_impl);
 259     g_free((char *)info.name);
 260
 261     new_iface = (InterfaceClass *)iface_impl->class;
 262     new_iface->concrete_class = ti->class;
 263     new_iface->interface_type = interface_type;
 264
 265     ti->class->interfaces = g_slist_append(ti->class->interfaces, new_iface);
 266 }
 267
 268 static void object_property_free(gpointer data)
 269 {
 270     ObjectProperty *prop = data;
 271
 272     if (prop->defval) {
 273         qobject_unref(prop->defval);
 274         prop->defval = NULL;
 275     }
 276     g_free(prop->name);
 277     g_free(prop->type);
 278     g_free(prop->description);
 279     g_free(prop);
 280 }
 281
 282 static void type_initialize(TypeImpl *ti)
 283 {
 284     TypeImpl *parent;
 285
 286     if (ti->class) {
 287         return;
 288     }
 289
 290     ti->class_size = type_class_get_size(ti);
 291     ti->instance_size = type_object_get_size(ti);
 292     /* Any type with zero instance_size is implicitly abstract.
 293      * This means interface types are all abstract.
 294      */
 295     if (ti->instance_size == 0) {
 296         ti->abstract = true;
 297     }
 298     if (type_is_ancestor(ti, type_interface)) {
 299         assert(ti->instance_size == 0);
 300         assert(ti->abstract);
 301         assert(!ti->instance_init);
 302         assert(!ti->instance_post_init);
 303         assert(!ti->instance_finalize);
 304         assert(!ti->num_interfaces);
 305     }
 306     ti->class = g_malloc0(ti->class_size);
 307
 308     parent = type_get_parent(ti);
 309     if (parent) {
 310         type_initialize(parent);
 311         GSList *e;
 312         int i;
 313
 314         g_assert(parent->class_size <= ti->class_size);
 315         g_assert(parent->instance_size <= ti->instance_size);
 316         memcpy(ti->class, parent->class, parent->class_size);
 317         ti->class->interfaces = NULL;
 318
 319         for (e = parent->class->interfaces; e; e = e->next) {
 320             InterfaceClass *iface = e->data;
 321             ObjectClass *klass = OBJECT_CLASS(iface);
 322
 323             type_initialize_interface(ti, iface->interface_type, klass->type);
 324         }
 325
 326         for (i = 0; i < ti->num_interfaces; i++) {
 327             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 328             if (!t) {
 329                 error_report("missing interface '%s' for object '%s'",
 330                              ti->interfaces[i].typename, parent->name);
 331                 abort();
 332             }
 333             for (e = ti->class->interfaces; e; e = e->next) {
 334                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 335
 336                 if (type_is_ancestor(target_type, t)) {
 337                     break;
 338                 }
 339             }
 340
 341             if (e) {
 342                 continue;
 343             }
 344
 345             type_initialize_interface(ti, t, t);
 346         }
 347     }
 348
 349     ti->class->properties = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
 350                                                   object_property_free);
 351
 352     ti->class->type = ti;
 353
 354     while (parent) {
 355         if (parent->class_base_init) {
 356             parent->class_base_init(ti->class, ti->class_data);
 357         }
 358         parent = type_get_parent(parent);
 359     }
 360
 361     if (ti->class_init) {
 362         ti->class_init(ti->class, ti->class_data);
 363     }
 364 }
 365
 366 static void object_init_with_type(Object *obj, TypeImpl *ti)
 367 {
 368     if (type_has_parent(ti)) {
 369         object_init_with_type(obj, type_get_parent(ti));
 370     }
 371
 372     if (ti->instance_init) {
 373         ti->instance_init(obj);
 374     }
 375 }
 376
 377 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 378 {
 379     if (ti->instance_post_init) {
 380         ti->instance_post_init(obj);
 381     }
 382
 383     if (type_has_parent(ti)) {
 384         object_post_init_with_type(obj, type_get_parent(ti));
 385     }
 386 }
 387
 388 bool object_apply_global_props(Object *obj, const GPtrArray *props,
 389                                Error **errp)
 390 {
 391     int i;
 392
 393     if (!props) {
 394         return true;
 395     }
 396
 397     for (i = 0; i < props->len; i++) {
 398         GlobalProperty *p = g_ptr_array_index(props, i);
 399         Error *err = NULL;
 400
 401         if (object_dynamic_cast(obj, p->driver) == NULL) {
 402             continue;
 403         }
 404         if (p->optional && !object_property_find(obj, p->property, NULL)) {
 405             continue;
 406         }
 407         p->used = true;
 408         if (!object_property_parse(obj, p->property, p->value, &err)) {
 409             error_prepend(&err, "can't apply global %s.%s=%s: ",
 410                           p->driver, p->property, p->value);
 411             /*
 412              * If errp != NULL, propagate error and return.
 413              * If errp == NULL, report a warning, but keep going
 414              * with the remaining globals.
 415              */
 416             if (errp) {
 417                 error_propagate(errp, err);
 418                 return false;
 419             } else {
 420                 warn_report_err(err);
 421             }
 422         }
 423     }
 424
 425     return true;
 426 }
 427
 428 /*
 429  * Global property defaults
 430  * Slot 0: accelerator's global property defaults
 431  * Slot 1: machine's global property defaults
 432  * Slot 2: global properties from legacy command line option
 433  * Each is a GPtrArray of of GlobalProperty.
 434  * Applied in order, later entries override earlier ones.
 435  */
 436 static GPtrArray *object_compat_props[3];
 437
 438 /*
 439  * Retrieve @GPtrArray for global property defined with options
 440  * other than "-global".  These are generally used for syntactic
 441  * sugar and legacy command line options.
 442  */
 443 void object_register_sugar_prop(const char *driver, const char *prop, const char *value)
 444 {
 445     GlobalProperty *g;
 446     if (!object_compat_props[2]) {
 447         object_compat_props[2] = g_ptr_array_new();
 448     }
 449     g = g_new0(GlobalProperty, 1);
 450     g->driver = g_strdup(driver);
 451     g->property = g_strdup(prop);
 452     g->value = g_strdup(value);
 453     g_ptr_array_add(object_compat_props[2], g);
 454 }
 455
 456 /*
 457  * Set machine's global property defaults to @compat_props.
 458  * May be called at most once.
 459  */
 460 void object_set_machine_compat_props(GPtrArray *compat_props)
 461 {
 462     assert(!object_compat_props[1]);
 463     object_compat_props[1] = compat_props;
 464 }
 465
 466 /*
 467  * Set accelerator's global property defaults to @compat_props.
 468  * May be called at most once.
 469  */
 470 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 471 {
 472     assert(!object_compat_props[0]);
 473     object_compat_props[0] = compat_props;
 474 }
 475
 476 void object_apply_compat_props(Object *obj)
 477 {
 478     int i;
 479
 480     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 481         object_apply_global_props(obj, object_compat_props[i],
 482                                   i == 2 ? &error_fatal : &error_abort);
 483     }
 484 }
 485
 486 static void object_class_property_init_all(Object *obj)
 487 {
 488     ObjectPropertyIterator iter;
 489     ObjectProperty *prop;
 490
 491     object_class_property_iter_init(&iter, object_get_class(obj));
 492     while ((prop = object_property_iter_next(&iter))) {
 493         if (prop->init) {
 494             prop->init(obj, prop);
 495         }
 496     }
 497 }
 498
 499 static void object_initialize_with_type(Object *obj, size_t size, TypeImpl *type)
 500 {
 501     type_initialize(type);
 502
 503     g_assert(type->instance_size >= sizeof(Object));
 504     g_assert(type->abstract == false);
 505     g_assert(size >= type->instance_size);
 506
 507     memset(obj, 0, type->instance_size);
 508     obj->class = type->class;
 509     object_ref(obj);
 510     object_class_property_init_all(obj);
 511     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 512                                             NULL, object_property_free);
 513     object_init_with_type(obj, type);
 514     object_post_init_with_type(obj, type);
 515 }
 516
 517 void object_initialize(void *data, size_t size, const char *typename)
 518 {
 519     TypeImpl *type = type_get_by_name(typename);
 520
 521     if (!type) {
 522         error_report("missing object type '%s'", typename);
 523         abort();
 524     }
 525
 526     object_initialize_with_type(data, size, type);
 527 }
 528
 529 bool object_initialize_child_with_props(Object *parentobj,
 530                                         const char *propname,
 531                                         void *childobj, size_t size,
 532                                         const char *type,
 533                                         Error **errp, ...)
 534 {
 535     va_list vargs;
 536     bool ok;
 537
 538     va_start(vargs, errp);
 539     ok = object_initialize_child_with_propsv(parentobj, propname,
 540                                              childobj, size, type, errp,
 541                                              vargs);
 542     va_end(vargs);
 543     return ok;
 544 }
 545
 546 bool object_initialize_child_with_propsv(Object *parentobj,
 547                                          const char *propname,
 548                                          void *childobj, size_t size,
 549                                          const char *type,
 550                                          Error **errp, va_list vargs)
 551 {
 552     bool ok = false;
 553     Object *obj;
 554     UserCreatable *uc;
 555
 556     object_initialize(childobj, size, type);
 557     obj = OBJECT(childobj);
 558
 559     if (!object_set_propv(obj, errp, vargs)) {
 560         goto out;
 561     }
 562
 563     object_property_add_child(parentobj, propname, obj);
 564
 565     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 566     if (uc) {
 567         if (!user_creatable_complete(uc, errp)) {
 568             object_unparent(obj);
 569             goto out;
 570         }
 571     }
 572
 573     ok = true;
 574
 575 out:
 576     /*
 577      * We want @obj's reference to be 1 on success, 0 on failure.
 578      * On success, it's 2: one taken by object_initialize(), and one
 579      * by object_property_add_child().
 580      * On failure in object_initialize() or earlier, it's 1.
 581      * On failure afterwards, it's also 1: object_unparent() releases
 582      * the reference taken by object_property_add_child().
 583      */
 584     object_unref(obj);
 585     return ok;
 586 }
 587
 588 void object_initialize_child_internal(Object *parent,
 589                                       const char *propname,
 590                                       void *child, size_t size,
 591                                       const char *type)
 592 {
 593     object_initialize_child_with_props(parent, propname, child, size, type,
 594                                        &error_abort, NULL);
 595 }
 596
 597 static inline bool object_property_is_child(ObjectProperty *prop)
 598 {
 599     return strstart(prop->type, "child<", NULL);
 600 }
 601
 602 static void object_property_del_all(Object *obj)
 603 {
 604     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
 605     ObjectProperty *prop;
 606     ObjectPropertyIterator iter;
 607     bool released;
 608
 609     do {
 610         released = false;
 611         object_property_iter_init(&iter, obj);
 612         while ((prop = object_property_iter_next(&iter)) != NULL) {
 613             if (g_hash_table_add(done, prop)) {
 614                 if (prop->release) {
 615                     prop->release(obj, prop->name, prop->opaque);
 616                     released = true;
 617                     break;
 618                 }
 619             }
 620         }
 621     } while (released);
 622
 623     g_hash_table_unref(obj->properties);
 624 }
 625
 626 static void object_property_del_child(Object *obj, Object *child)
 627 {
 628     ObjectProperty *prop;
 629     GHashTableIter iter;
 630     gpointer key, value;
 631
 632     g_hash_table_iter_init(&iter, obj->properties);
 633     while (g_hash_table_iter_next(&iter, &key, &value)) {
 634         prop = value;
 635         if (object_property_is_child(prop) && prop->opaque == child) {
 636             if (prop->release) {
 637                 prop->release(obj, prop->name, prop->opaque);
 638                 prop->release = NULL;
 639             }
 640             break;
 641         }
 642     }
 643     g_hash_table_iter_init(&iter, obj->properties);
 644     while (g_hash_table_iter_next(&iter, &key, &value)) {
 645         prop = value;
 646         if (object_property_is_child(prop) && prop->opaque == child) {
 647             g_hash_table_iter_remove(&iter);
 648             break;
 649         }
 650     }
 651 }
 652
 653 void object_unparent(Object *obj)
 654 {
 655     if (obj->parent) {
 656         object_property_del_child(obj->parent, obj);
 657     }
 658 }
 659
 660 static void object_deinit(Object *obj, TypeImpl *type)
 661 {
 662     if (type->instance_finalize) {
 663         type->instance_finalize(obj);
 664     }
 665
 666     if (type_has_parent(type)) {
 667         object_deinit(obj, type_get_parent(type));
 668     }
 669 }
 670
 671 static void object_finalize(void *data)
 672 {
 673     Object *obj = data;
 674     TypeImpl *ti = obj->class->type;
 675
 676     object_property_del_all(obj);
 677     object_deinit(obj, ti);
 678
 679     g_assert(obj->ref == 0);
 680     if (obj->free) {
 681         obj->free(obj);
 682     }
 683 }
 684
 685 static Object *object_new_with_type(Type type)
 686 {
 687     Object *obj;
 688
 689     g_assert(type != NULL);
 690     type_initialize(type);
 691
 692     obj = g_malloc(type->instance_size);
 693     object_initialize_with_type(obj, type->instance_size, type);
 694     obj->free = g_free;
 695
 696     return obj;
 697 }
 698
 699 Object *object_new_with_class(ObjectClass *klass)
 700 {
 701     return object_new_with_type(klass->type);
 702 }
 703
 704 Object *object_new(const char *typename)
 705 {
 706     TypeImpl *ti = type_get_by_name(typename);
 707
 708     return object_new_with_type(ti);
 709 }
 710
 711
 712 Object *object_new_with_props(const char *typename,
 713                               Object *parent,
 714                               const char *id,
 715                               Error **errp,
 716                               ...)
 717 {
 718     va_list vargs;
 719     Object *obj;
 720
 721     va_start(vargs, errp);
 722     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 723     va_end(vargs);
 724
 725     return obj;
 726 }
 727
 728
 729 Object *object_new_with_propv(const char *typename,
 730                               Object *parent,
 731                               const char *id,
 732                               Error **errp,
 733                               va_list vargs)
 734 {
 735     Object *obj;
 736     ObjectClass *klass;
 737     UserCreatable *uc;
 738
 739     klass = object_class_by_name(typename);
 740     if (!klass) {
 741         error_setg(errp, "invalid object type: %s", typename);
 742         return NULL;
 743     }
 744
 745     if (object_class_is_abstract(klass)) {
 746         error_setg(errp, "object type '%s' is abstract", typename);
 747         return NULL;
 748     }
 749     obj = object_new_with_type(klass->type);
 750
 751     if (!object_set_propv(obj, errp, vargs)) {
 752         goto error;
 753     }
 754
 755     if (id != NULL) {
 756         object_property_add_child(parent, id, obj);
 757     }
 758
 759     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 760     if (uc) {
 761         if (!user_creatable_complete(uc, errp)) {
 762             if (id != NULL) {
 763                 object_unparent(obj);
 764             }
 765             goto error;
 766         }
 767     }
 768
 769     object_unref(obj);
 770     return obj;
 771
 772  error:
 773     object_unref(obj);
 774     return NULL;
 775 }
 776
 777
 778 bool object_set_props(Object *obj,
 779                      Error **errp,
 780                      ...)
 781 {
 782     va_list vargs;
 783     bool ret;
 784
 785     va_start(vargs, errp);
 786     ret = object_set_propv(obj, errp, vargs);
 787     va_end(vargs);
 788
 789     return ret;
 790 }
 791
 792
 793 bool object_set_propv(Object *obj,
 794                      Error **errp,
 795                      va_list vargs)
 796 {
 797     const char *propname;
 798
 799     propname = va_arg(vargs, char *);
 800     while (propname != NULL) {
 801         const char *value = va_arg(vargs, char *);
 802
 803         g_assert(value != NULL);
 804         if (!object_property_parse(obj, propname, value, errp)) {
 805             return false;
 806         }
 807         propname = va_arg(vargs, char *);
 808     }
 809
 810     return true;
 811 }
 812
 813
 814 Object *object_dynamic_cast(Object *obj, const char *typename)
 815 {
 816     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 817         return obj;
 818     }
 819
 820     return NULL;
 821 }
 822
 823 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 824                                    const char *file, int line, const char *func)
 825 {
 826     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 827                                      typename, file, line, func);
 828
 829 #ifdef CONFIG_QOM_CAST_DEBUG
 830     int i;
 831     Object *inst;
 832
 833     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 834         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 835             goto out;
 836         }
 837     }
 838
 839     inst = object_dynamic_cast(obj, typename);
 840
 841     if (!inst && obj) {
 842         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 843                 file, line, func, obj, typename);
 844         abort();
 845     }
 846
 847     assert(obj == inst);
 848
 849     if (obj && obj == inst) {
 850         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 851             atomic_set(&obj->class->object_cast_cache[i - 1],
 852                        atomic_read(&obj->class->object_cast_cache[i]));
 853         }
 854         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 855     }
 856
 857 out:
 858 #endif
 859     return obj;
 860 }
 861
 862 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 863                                        const char *typename)
 864 {
 865     ObjectClass *ret = NULL;
 866     TypeImpl *target_type;
 867     TypeImpl *type;
 868
 869     if (!class) {
 870         return NULL;
 871     }
 872
 873     /* A simple fast path that can trigger a lot for leaf classes.  */
 874     type = class->type;
 875     if (type->name == typename) {
 876         return class;
 877     }
 878
 879     target_type = type_get_by_name(typename);
 880     if (!target_type) {
 881         /* target class type unknown, so fail the cast */
 882         return NULL;
 883     }
 884
 885     if (type->class->interfaces &&
 886             type_is_ancestor(target_type, type_interface)) {
 887         int found = 0;
 888         GSList *i;
 889
 890         for (i = class->interfaces; i; i = i->next) {
 891             ObjectClass *target_class = i->data;
 892
 893             if (type_is_ancestor(target_class->type, target_type)) {
 894                 ret = target_class;
 895                 found++;
 896             }
 897          }
 898
 899         /* The match was ambiguous, don't allow a cast */
 900         if (found > 1) {
 901             ret = NULL;
 902         }
 903     } else if (type_is_ancestor(type, target_type)) {
 904         ret = class;
 905     }
 906
 907     return ret;
 908 }
 909
 910 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 911                                               const char *typename,
 912                                               const char *file, int line,
 913                                               const char *func)
 914 {
 915     ObjectClass *ret;
 916
 917     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 918                                            typename, file, line, func);
 919
 920 #ifdef CONFIG_QOM_CAST_DEBUG
 921     int i;
 922
 923     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 924         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 925             ret = class;
 926             goto out;
 927         }
 928     }
 929 #else
 930     if (!class || !class->interfaces) {
 931         return class;
 932     }
 933 #endif
 934
 935     ret = object_class_dynamic_cast(class, typename);
 936     if (!ret && class) {
 937         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 938                 file, line, func, class, typename);
 939         abort();
 940     }
 941
 942 #ifdef CONFIG_QOM_CAST_DEBUG
 943     if (class && ret == class) {
 944         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 945             atomic_set(&class->class_cast_cache[i - 1],
 946                        atomic_read(&class->class_cast_cache[i]));
 947         }
 948         atomic_set(&class->class_cast_cache[i - 1], typename);
 949     }
 950 out:
 951 #endif
 952     return ret;
 953 }
 954
 955 const char *object_get_typename(const Object *obj)
 956 {
 957     return obj->class->type->name;
 958 }
 959
 960 ObjectClass *object_get_class(Object *obj)
 961 {
 962     return obj->class;
 963 }
 964
 965 bool object_class_is_abstract(ObjectClass *klass)
 966 {
 967     return klass->type->abstract;
 968 }
 969
 970 const char *object_class_get_name(ObjectClass *klass)
 971 {
 972     return klass->type->name;
 973 }
 974
 975 ObjectClass *object_class_by_name(const char *typename)
 976 {
 977     TypeImpl *type = type_get_by_name(typename);
 978
 979     if (!type) {
 980         return NULL;
 981     }
 982
 983     type_initialize(type);
 984
 985     return type->class;
 986 }
 987
 988 ObjectClass *module_object_class_by_name(const char *typename)
 989 {
 990     ObjectClass *oc;
 991
 992     oc = object_class_by_name(typename);
 993 #ifdef CONFIG_MODULES
 994     if (!oc) {
 995         module_load_qom_one(typename);
 996         oc = object_class_by_name(typename);
 997     }
 998 #endif
 999     return oc;
1000 }
1001
1002 ObjectClass *object_class_get_parent(ObjectClass *class)
1003 {
1004     TypeImpl *type = type_get_parent(class->type);
1005
1006     if (!type) {
1007         return NULL;
1008     }
1009
1010     type_initialize(type);
1011
1012     return type->class;
1013 }
1014
1015 typedef struct OCFData
1016 {
1017     void (*fn)(ObjectClass *klass, void *opaque);
1018     const char *implements_type;
1019     bool include_abstract;
1020     void *opaque;
1021 } OCFData;
1022
1023 static void object_class_foreach_tramp(gpointer key, gpointer value,
1024                                        gpointer opaque)
1025 {
1026     OCFData *data = opaque;
1027     TypeImpl *type = value;
1028     ObjectClass *k;
1029
1030     type_initialize(type);
1031     k = type->class;
1032
1033     if (!data->include_abstract && type->abstract) {
1034         return;
1035     }
1036
1037     if (data->implements_type &&
1038         !object_class_dynamic_cast(k, data->implements_type)) {
1039         return;
1040     }
1041
1042     data->fn(k, data->opaque);
1043 }
1044
1045 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
1046                           const char *implements_type, bool include_abstract,
1047                           void *opaque)
1048 {
1049     OCFData data = { fn, implements_type, include_abstract, opaque };
1050
1051     enumerating_types = true;
1052     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
1053     enumerating_types = false;
1054 }
1055
1056 static int do_object_child_foreach(Object *obj,
1057                                    int (*fn)(Object *child, void *opaque),
1058                                    void *opaque, bool recurse)
1059 {
1060     GHashTableIter iter;
1061     ObjectProperty *prop;
1062     int ret = 0;
1063
1064     g_hash_table_iter_init(&iter, obj->properties);
1065     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1066         if (object_property_is_child(prop)) {
1067             Object *child = prop->opaque;
1068
1069             ret = fn(child, opaque);
1070             if (ret != 0) {
1071                 break;
1072             }
1073             if (recurse) {
1074                 ret = do_object_child_foreach(child, fn, opaque, true);
1075                 if (ret != 0) {
1076                     break;
1077                 }
1078             }
1079         }
1080     }
1081     return ret;
1082 }
1083
1084 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1085                          void *opaque)
1086 {
1087     return do_object_child_foreach(obj, fn, opaque, false);
1088 }
1089
1090 int object_child_foreach_recursive(Object *obj,
1091                                    int (*fn)(Object *child, void *opaque),
1092                                    void *opaque)
1093 {
1094     return do_object_child_foreach(obj, fn, opaque, true);
1095 }
1096
1097 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1098 {
1099     GSList **list = opaque;
1100
1101     *list = g_slist_prepend(*list, klass);
1102 }
1103
1104 GSList *object_class_get_list(const char *implements_type,
1105                               bool include_abstract)
1106 {
1107     GSList *list = NULL;
1108
1109     object_class_foreach(object_class_get_list_tramp,
1110                          implements_type, include_abstract, &list);
1111     return list;
1112 }
1113
1114 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1115 {
1116     return strcasecmp(object_class_get_name((ObjectClass *)a),
1117                       object_class_get_name((ObjectClass *)b));
1118 }
1119
1120 GSList *object_class_get_list_sorted(const char *implements_type,
1121                                      bool include_abstract)
1122 {
1123     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1124                         object_class_cmp);
1125 }
1126
1127 Object *object_ref(Object *obj)
1128 {
1129     if (!obj) {
1130         return NULL;
1131     }
1132     atomic_inc(&obj->ref);
1133     return obj;
1134 }
1135
1136 void object_unref(Object *obj)
1137 {
1138     if (!obj) {
1139         return;
1140     }
1141     g_assert(obj->ref > 0);
1142
1143     /* parent always holds a reference to its children */
1144     if (atomic_fetch_dec(&obj->ref) == 1) {
1145         object_finalize(obj);
1146     }
1147 }
1148
1149 ObjectProperty *
1150 object_property_try_add(Object *obj, const char *name, const char *type,
1151                         ObjectPropertyAccessor *get,
1152                         ObjectPropertyAccessor *set,
1153                         ObjectPropertyRelease *release,
1154                         void *opaque, Error **errp)
1155 {
1156     ObjectProperty *prop;
1157     size_t name_len = strlen(name);
1158
1159     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1160         int i;
1161         ObjectProperty *ret;
1162         char *name_no_array = g_strdup(name);
1163
1164         name_no_array[name_len - 3] = '\0';
1165         for (i = 0; ; ++i) {
1166             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1167
1168             ret = object_property_try_add(obj, full_name, type, get, set,
1169                                           release, opaque, NULL);
1170             g_free(full_name);
1171             if (ret) {
1172                 break;
1173             }
1174         }
1175         g_free(name_no_array);
1176         return ret;
1177     }
1178
1179     if (object_property_find(obj, name, NULL) != NULL) {
1180         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1181                    name, object_get_typename(obj));
1182         return NULL;
1183     }
1184
1185     prop = g_malloc0(sizeof(*prop));
1186
1187     prop->name = g_strdup(name);
1188     prop->type = g_strdup(type);
1189
1190     prop->get = get;
1191     prop->set = set;
1192     prop->release = release;
1193     prop->opaque = opaque;
1194
1195     g_hash_table_insert(obj->properties, prop->name, prop);
1196     return prop;
1197 }
1198
1199 ObjectProperty *
1200 object_property_add(Object *obj, const char *name, const char *type,
1201                     ObjectPropertyAccessor *get,
1202                     ObjectPropertyAccessor *set,
1203                     ObjectPropertyRelease *release,
1204                     void *opaque)
1205 {
1206     return object_property_try_add(obj, name, type, get, set, release,
1207                                    opaque, &error_abort);
1208 }
1209
1210 ObjectProperty *
1211 object_class_property_add(ObjectClass *klass,
1212                           const char *name,
1213                           const char *type,
1214                           ObjectPropertyAccessor *get,
1215                           ObjectPropertyAccessor *set,
1216                           ObjectPropertyRelease *release,
1217                           void *opaque)
1218 {
1219     ObjectProperty *prop;
1220
1221     assert(!object_class_property_find(klass, name, NULL));
1222
1223     prop = g_malloc0(sizeof(*prop));
1224
1225     prop->name = g_strdup(name);
1226     prop->type = g_strdup(type);
1227
1228     prop->get = get;
1229     prop->set = set;
1230     prop->release = release;
1231     prop->opaque = opaque;
1232
1233     g_hash_table_insert(klass->properties, prop->name, prop);
1234
1235     return prop;
1236 }
1237
1238 ObjectProperty *object_property_find(Object *obj, const char *name,
1239                                      Error **errp)
1240 {
1241     ObjectProperty *prop;
1242     ObjectClass *klass = object_get_class(obj);
1243
1244     prop = object_class_property_find(klass, name, NULL);
1245     if (prop) {
1246         return prop;
1247     }
1248
1249     prop = g_hash_table_lookup(obj->properties, name);
1250     if (prop) {
1251         return prop;
1252     }
1253
1254     error_setg(errp, "Property '.%s' not found", name);
1255     return NULL;
1256 }
1257
1258 void object_property_iter_init(ObjectPropertyIterator *iter,
1259                                Object *obj)
1260 {
1261     g_hash_table_iter_init(&iter->iter, obj->properties);
1262     iter->nextclass = object_get_class(obj);
1263 }
1264
1265 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1266 {
1267     gpointer key, val;
1268     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1269         if (!iter->nextclass) {
1270             return NULL;
1271         }
1272         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1273         iter->nextclass = object_class_get_parent(iter->nextclass);
1274     }
1275     return val;
1276 }
1277
1278 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1279                                      ObjectClass *klass)
1280 {
1281     g_hash_table_iter_init(&iter->iter, klass->properties);
1282     iter->nextclass = object_class_get_parent(klass);
1283 }
1284
1285 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1286                                            Error **errp)
1287 {
1288     ObjectProperty *prop;
1289     ObjectClass *parent_klass;
1290
1291     parent_klass = object_class_get_parent(klass);
1292     if (parent_klass) {
1293         prop = object_class_property_find(parent_klass, name, NULL);
1294         if (prop) {
1295             return prop;
1296         }
1297     }
1298
1299     prop = g_hash_table_lookup(klass->properties, name);
1300     if (!prop) {
1301         error_setg(errp, "Property '.%s' not found", name);
1302     }
1303     return prop;
1304 }
1305
1306 void object_property_del(Object *obj, const char *name)
1307 {
1308     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1309
1310     if (prop->release) {
1311         prop->release(obj, name, prop->opaque);
1312     }
1313     g_hash_table_remove(obj->properties, name);
1314 }
1315
1316 bool object_property_get(Object *obj, const char *name, Visitor *v,
1317                          Error **errp)
1318 {
1319     Error *err = NULL;
1320     ObjectProperty *prop = object_property_find(obj, name, errp);
1321
1322     if (prop == NULL) {
1323         return false;
1324     }
1325
1326     if (!prop->get) {
1327         error_setg(errp, QERR_PERMISSION_DENIED);
1328         return false;
1329     }
1330     prop->get(obj, v, name, prop->opaque, &err);
1331     error_propagate(errp, err);
1332     return !err;
1333 }
1334
1335 bool object_property_set(Object *obj, const char *name, Visitor *v,
1336                          Error **errp)
1337 {
1338     Error *err = NULL;
1339     ObjectProperty *prop = object_property_find(obj, name, errp);
1340
1341     if (prop == NULL) {
1342         return false;
1343     }
1344
1345     if (!prop->set) {
1346         error_setg(errp, QERR_PERMISSION_DENIED);
1347         return false;
1348     }
1349     prop->set(obj, v, name, prop->opaque, &err);
1350     error_propagate(errp, err);
1351     return !err;
1352 }
1353
1354 bool object_property_set_str(Object *obj, const char *name,
1355                              const char *value, Error **errp)
1356 {
1357     QString *qstr = qstring_from_str(value);
1358     bool ok = object_property_set_qobject(obj, name, QOBJECT(qstr), errp);
1359
1360     qobject_unref(qstr);
1361     return ok;
1362 }
1363
1364 char *object_property_get_str(Object *obj, const char *name,
1365                               Error **errp)
1366 {
1367     QObject *ret = object_property_get_qobject(obj, name, errp);
1368     char *retval;
1369
1370     if (!ret) {
1371         return NULL;
1372     }
1373
1374     retval = g_strdup(qobject_get_try_str(ret));
1375     if (!retval) {
1376         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1377     }
1378
1379     qobject_unref(ret);
1380     return retval;
1381 }
1382
1383 bool object_property_set_link(Object *obj, const char *name,
1384                               Object *value, Error **errp)
1385 {
1386     g_autofree char *path = NULL;
1387
1388     if (value) {
1389         path = object_get_canonical_path(value);
1390     }
1391     return object_property_set_str(obj, name, path ?: "", errp);
1392 }
1393
1394 Object *object_property_get_link(Object *obj, const char *name,
1395                                  Error **errp)
1396 {
1397     char *str = object_property_get_str(obj, name, errp);
1398     Object *target = NULL;
1399
1400     if (str && *str) {
1401         target = object_resolve_path(str, NULL);
1402         if (!target) {
1403             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1404                       "Device '%s' not found", str);
1405         }
1406     }
1407
1408     g_free(str);
1409     return target;
1410 }
1411
1412 bool object_property_set_bool(Object *obj, const char *name,
1413                               bool value, Error **errp)
1414 {
1415     QBool *qbool = qbool_from_bool(value);
1416     bool ok = object_property_set_qobject(obj, name, QOBJECT(qbool), errp);
1417
1418     qobject_unref(qbool);
1419     return ok;
1420 }
1421
1422 bool object_property_get_bool(Object *obj, const char *name,
1423                               Error **errp)
1424 {
1425     QObject *ret = object_property_get_qobject(obj, name, errp);
1426     QBool *qbool;
1427     bool retval;
1428
1429     if (!ret) {
1430         return false;
1431     }
1432     qbool = qobject_to(QBool, ret);
1433     if (!qbool) {
1434         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1435         retval = false;
1436     } else {
1437         retval = qbool_get_bool(qbool);
1438     }
1439
1440     qobject_unref(ret);
1441     return retval;
1442 }
1443
1444 bool object_property_set_int(Object *obj, const char *name,
1445                              int64_t value, Error **errp)
1446 {
1447     QNum *qnum = qnum_from_int(value);
1448     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1449
1450     qobject_unref(qnum);
1451     return ok;
1452 }
1453
1454 int64_t object_property_get_int(Object *obj, const char *name,
1455                                 Error **errp)
1456 {
1457     QObject *ret = object_property_get_qobject(obj, name, errp);
1458     QNum *qnum;
1459     int64_t retval;
1460
1461     if (!ret) {
1462         return -1;
1463     }
1464
1465     qnum = qobject_to(QNum, ret);
1466     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1467         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1468         retval = -1;
1469     }
1470
1471     qobject_unref(ret);
1472     return retval;
1473 }
1474
1475 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
1476 {
1477     Visitor *v = qobject_input_visitor_new(prop->defval);
1478
1479     assert(prop->set != NULL);
1480     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
1481
1482     visit_free(v);
1483 }
1484
1485 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
1486 {
1487     assert(!prop->defval);
1488     assert(!prop->init);
1489
1490     prop->defval = defval;
1491     prop->init = object_property_init_defval;
1492 }
1493
1494 void object_property_set_default_bool(ObjectProperty *prop, bool value)
1495 {
1496     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
1497 }
1498
1499 void object_property_set_default_str(ObjectProperty *prop, const char *value)
1500 {
1501     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
1502 }
1503
1504 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
1505 {
1506     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
1507 }
1508
1509 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
1510 {
1511     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
1512 }
1513
1514 bool object_property_set_uint(Object *obj, const char *name,
1515                               uint64_t value, Error **errp)
1516 {
1517     QNum *qnum = qnum_from_uint(value);
1518     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1519
1520     qobject_unref(qnum);
1521     return ok;
1522 }
1523
1524 uint64_t object_property_get_uint(Object *obj, const char *name,
1525                                   Error **errp)
1526 {
1527     QObject *ret = object_property_get_qobject(obj, name, errp);
1528     QNum *qnum;
1529     uint64_t retval;
1530
1531     if (!ret) {
1532         return 0;
1533     }
1534     qnum = qobject_to(QNum, ret);
1535     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1536         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1537         retval = 0;
1538     }
1539
1540     qobject_unref(ret);
1541     return retval;
1542 }
1543
1544 typedef struct EnumProperty {
1545     const QEnumLookup *lookup;
1546     int (*get)(Object *, Error **);
1547     void (*set)(Object *, int, Error **);
1548 } EnumProperty;
1549
1550 int object_property_get_enum(Object *obj, const char *name,
1551                              const char *typename, Error **errp)
1552 {
1553     char *str;
1554     int ret;
1555     ObjectProperty *prop = object_property_find(obj, name, errp);
1556     EnumProperty *enumprop;
1557
1558     if (prop == NULL) {
1559         return 0;
1560     }
1561
1562     if (!g_str_equal(prop->type, typename)) {
1563         error_setg(errp, "Property %s on %s is not '%s' enum type",
1564                    name, object_class_get_name(
1565                        object_get_class(obj)), typename);
1566         return 0;
1567     }
1568
1569     enumprop = prop->opaque;
1570
1571     str = object_property_get_str(obj, name, errp);
1572     if (!str) {
1573         return 0;
1574     }
1575
1576     ret = qapi_enum_parse(enumprop->lookup, str, -1, errp);
1577     g_free(str);
1578
1579     return ret;
1580 }
1581
1582 bool object_property_parse(Object *obj, const char *name,
1583                            const char *string, Error **errp)
1584 {
1585     Visitor *v = string_input_visitor_new(string);
1586     bool ok = object_property_set(obj, name, v, errp);
1587
1588     visit_free(v);
1589     return ok;
1590 }
1591
1592 char *object_property_print(Object *obj, const char *name, bool human,
1593                             Error **errp)
1594 {
1595     Visitor *v;
1596     char *string = NULL;
1597
1598     v = string_output_visitor_new(human, &string);
1599     if (!object_property_get(obj, name, v, errp)) {
1600         goto out;
1601     }
1602
1603     visit_complete(v, &string);
1604
1605 out:
1606     visit_free(v);
1607     return string;
1608 }
1609
1610 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1611 {
1612     ObjectProperty *prop = object_property_find(obj, name, errp);
1613     if (prop == NULL) {
1614         return NULL;
1615     }
1616
1617     return prop->type;
1618 }
1619
1620 Object *object_get_root(void)
1621 {
1622     static Object *root;
1623
1624     if (!root) {
1625         root = object_new("container");
1626     }
1627
1628     return root;
1629 }
1630
1631 Object *object_get_objects_root(void)
1632 {
1633     return container_get(object_get_root(), "/objects");
1634 }
1635
1636 Object *object_get_internal_root(void)
1637 {
1638     static Object *internal_root;
1639
1640     if (!internal_root) {
1641         internal_root = object_new("container");
1642     }
1643
1644     return internal_root;
1645 }
1646
1647 static void object_get_child_property(Object *obj, Visitor *v,
1648                                       const char *name, void *opaque,
1649                                       Error **errp)
1650 {
1651     Object *child = opaque;
1652     char *path;
1653
1654     path = object_get_canonical_path(child);
1655     visit_type_str(v, name, &path, errp);
1656     g_free(path);
1657 }
1658
1659 static Object *object_resolve_child_property(Object *parent, void *opaque,
1660                                              const char *part)
1661 {
1662     return opaque;
1663 }
1664
1665 static void object_finalize_child_property(Object *obj, const char *name,
1666                                            void *opaque)
1667 {
1668     Object *child = opaque;
1669
1670     if (child->class->unparent) {
1671         (child->class->unparent)(child);
1672     }
1673     child->parent = NULL;
1674     object_unref(child);
1675 }
1676
1677 ObjectProperty *
1678 object_property_try_add_child(Object *obj, const char *name,
1679                               Object *child, Error **errp)
1680 {
1681     g_autofree char *type = NULL;
1682     ObjectProperty *op;
1683
1684     assert(!child->parent);
1685
1686     type = g_strdup_printf("child<%s>", object_get_typename(child));
1687
1688     op = object_property_try_add(obj, name, type, object_get_child_property,
1689                                  NULL, object_finalize_child_property,
1690                                  child, errp);
1691     if (!op) {
1692         return NULL;
1693     }
1694     op->resolve = object_resolve_child_property;
1695     object_ref(child);
1696     child->parent = obj;
1697     return op;
1698 }
1699
1700 ObjectProperty *
1701 object_property_add_child(Object *obj, const char *name,
1702                           Object *child)
1703 {
1704     return object_property_try_add_child(obj, name, child, &error_abort);
1705 }
1706
1707 void object_property_allow_set_link(const Object *obj, const char *name,
1708                                     Object *val, Error **errp)
1709 {
1710     /* Allow the link to be set, always */
1711 }
1712
1713 typedef struct {
1714     union {
1715         Object **targetp;
1716         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
1717         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
1718     };
1719     void (*check)(const Object *, const char *, Object *, Error **);
1720     ObjectPropertyLinkFlags flags;
1721 } LinkProperty;
1722
1723 static Object **
1724 object_link_get_targetp(Object *obj, LinkProperty *lprop)
1725 {
1726     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
1727         return &lprop->target;
1728     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
1729         return (void *)obj + lprop->offset;
1730     } else {
1731         return lprop->targetp;
1732     }
1733 }
1734
1735 static void object_get_link_property(Object *obj, Visitor *v,
1736                                      const char *name, void *opaque,
1737                                      Error **errp)
1738 {
1739     LinkProperty *lprop = opaque;
1740     Object **targetp = object_link_get_targetp(obj, lprop);
1741     char *path;
1742
1743     if (*targetp) {
1744         path = object_get_canonical_path(*targetp);
1745         visit_type_str(v, name, &path, errp);
1746         g_free(path);
1747     } else {
1748         path = (char *)"";
1749         visit_type_str(v, name, &path, errp);
1750     }
1751 }
1752
1753 /*
1754  * object_resolve_link:
1755  *
1756  * Lookup an object and ensure its type matches the link property type.  This
1757  * is similar to object_resolve_path() except type verification against the
1758  * link property is performed.
1759  *
1760  * Returns: The matched object or NULL on path lookup failures.
1761  */
1762 static Object *object_resolve_link(Object *obj, const char *name,
1763                                    const char *path, Error **errp)
1764 {
1765     const char *type;
1766     char *target_type;
1767     bool ambiguous = false;
1768     Object *target;
1769
1770     /* Go from link<FOO> to FOO.  */
1771     type = object_property_get_type(obj, name, NULL);
1772     target_type = g_strndup(&type[5], strlen(type) - 6);
1773     target = object_resolve_path_type(path, target_type, &ambiguous);
1774
1775     if (ambiguous) {
1776         error_setg(errp, "Path '%s' does not uniquely identify an object",
1777                    path);
1778     } else if (!target) {
1779         target = object_resolve_path(path, &ambiguous);
1780         if (target || ambiguous) {
1781             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1782         } else {
1783             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1784                       "Device '%s' not found", path);
1785         }
1786         target = NULL;
1787     }
1788     g_free(target_type);
1789
1790     return target;
1791 }
1792
1793 static void object_set_link_property(Object *obj, Visitor *v,
1794                                      const char *name, void *opaque,
1795                                      Error **errp)
1796 {
1797     Error *local_err = NULL;
1798     LinkProperty *prop = opaque;
1799     Object **targetp = object_link_get_targetp(obj, prop);
1800     Object *old_target = *targetp;
1801     Object *new_target;
1802     char *path = NULL;
1803
1804     if (!visit_type_str(v, name, &path, errp)) {
1805         return;
1806     }
1807
1808     if (*path) {
1809         new_target = object_resolve_link(obj, name, path, errp);
1810         if (!new_target) {
1811             g_free(path);
1812             return;
1813         }
1814     } else {
1815         new_target = NULL;
1816     }
1817
1818     g_free(path);
1819
1820     prop->check(obj, name, new_target, &local_err);
1821     if (local_err) {
1822         error_propagate(errp, local_err);
1823         return;
1824     }
1825
1826     *targetp = new_target;
1827     if (prop->flags & OBJ_PROP_LINK_STRONG) {
1828         object_ref(new_target);
1829         object_unref(old_target);
1830     }
1831 }
1832
1833 static Object *object_resolve_link_property(Object *parent, void *opaque,
1834                                             const char *part)
1835 {
1836     LinkProperty *lprop = opaque;
1837
1838     return *object_link_get_targetp(parent, lprop);
1839 }
1840
1841 static void object_release_link_property(Object *obj, const char *name,
1842                                          void *opaque)
1843 {
1844     LinkProperty *prop = opaque;
1845     Object **targetp = object_link_get_targetp(obj, prop);
1846
1847     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
1848         object_unref(*targetp);
1849     }
1850     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
1851         g_free(prop);
1852     }
1853 }
1854
1855 static ObjectProperty *
1856 object_add_link_prop(Object *obj, const char *name,
1857                      const char *type, void *ptr,
1858                      void (*check)(const Object *, const char *,
1859                                    Object *, Error **),
1860                      ObjectPropertyLinkFlags flags)
1861 {
1862     LinkProperty *prop = g_malloc(sizeof(*prop));
1863     g_autofree char *full_type = NULL;
1864     ObjectProperty *op;
1865
1866     if (flags & OBJ_PROP_LINK_DIRECT) {
1867         prop->target = ptr;
1868     } else {
1869         prop->targetp = ptr;
1870     }
1871     prop->check = check;
1872     prop->flags = flags;
1873
1874     full_type = g_strdup_printf("link<%s>", type);
1875
1876     op = object_property_add(obj, name, full_type,
1877                              object_get_link_property,
1878                              check ? object_set_link_property : NULL,
1879                              object_release_link_property,
1880                              prop);
1881     op->resolve = object_resolve_link_property;
1882     return op;
1883 }
1884
1885 ObjectProperty *
1886 object_property_add_link(Object *obj, const char *name,
1887                          const char *type, Object **targetp,
1888                          void (*check)(const Object *, const char *,
1889                                        Object *, Error **),
1890                          ObjectPropertyLinkFlags flags)
1891 {
1892     return object_add_link_prop(obj, name, type, targetp, check, flags);
1893 }
1894
1895 ObjectProperty *
1896 object_class_property_add_link(ObjectClass *oc,
1897     const char *name,
1898     const char *type, ptrdiff_t offset,
1899     void (*check)(const Object *obj, const char *name,
1900                   Object *val, Error **errp),
1901     ObjectPropertyLinkFlags flags)
1902 {
1903     LinkProperty *prop = g_new0(LinkProperty, 1);
1904     char *full_type;
1905     ObjectProperty *op;
1906
1907     prop->offset = offset;
1908     prop->check = check;
1909     prop->flags = flags | OBJ_PROP_LINK_CLASS;
1910
1911     full_type = g_strdup_printf("link<%s>", type);
1912
1913     op = object_class_property_add(oc, name, full_type,
1914                                    object_get_link_property,
1915                                    check ? object_set_link_property : NULL,
1916                                    object_release_link_property,
1917                                    prop);
1918
1919     op->resolve = object_resolve_link_property;
1920
1921     g_free(full_type);
1922     return op;
1923 }
1924
1925 ObjectProperty *
1926 object_property_add_const_link(Object *obj, const char *name,
1927                                Object *target)
1928 {
1929     return object_add_link_prop(obj, name,
1930                                 object_get_typename(target), target,
1931                                 NULL, OBJ_PROP_LINK_DIRECT);
1932 }
1933
1934 const char *object_get_canonical_path_component(const Object *obj)
1935 {
1936     ObjectProperty *prop = NULL;
1937     GHashTableIter iter;
1938
1939     if (obj->parent == NULL) {
1940         return NULL;
1941     }
1942
1943     g_hash_table_iter_init(&iter, obj->parent->properties);
1944     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1945         if (!object_property_is_child(prop)) {
1946             continue;
1947         }
1948
1949         if (prop->opaque == obj) {
1950             return prop->name;
1951         }
1952     }
1953
1954     /* obj had a parent but was not a child, should never happen */
1955     g_assert_not_reached();
1956     return NULL;
1957 }
1958
1959 char *object_get_canonical_path(const Object *obj)
1960 {
1961     Object *root = object_get_root();
1962     char *newpath, *path = NULL;
1963
1964     if (obj == root) {
1965         return g_strdup("/");
1966     }
1967
1968     do {
1969         const char *component = object_get_canonical_path_component(obj);
1970
1971         if (!component) {
1972             /* A canonical path must be complete, so discard what was
1973              * collected so far.
1974              */
1975             g_free(path);
1976             return NULL;
1977         }
1978
1979         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1980         g_free(path);
1981         path = newpath;
1982         obj = obj->parent;
1983     } while (obj != root);
1984
1985     return path;
1986 }
1987
1988 Object *object_resolve_path_component(Object *parent, const char *part)
1989 {
1990     ObjectProperty *prop = object_property_find(parent, part, NULL);
1991     if (prop == NULL) {
1992         return NULL;
1993     }
1994
1995     if (prop->resolve) {
1996         return prop->resolve(parent, prop->opaque, part);
1997     } else {
1998         return NULL;
1999     }
2000 }
2001
2002 static Object *object_resolve_abs_path(Object *parent,
2003                                           char **parts,
2004                                           const char *typename)
2005 {
2006     Object *child;
2007
2008     if (*parts == NULL) {
2009         return object_dynamic_cast(parent, typename);
2010     }
2011
2012     if (strcmp(*parts, "") == 0) {
2013         return object_resolve_abs_path(parent, parts + 1, typename);
2014     }
2015
2016     child = object_resolve_path_component(parent, *parts);
2017     if (!child) {
2018         return NULL;
2019     }
2020
2021     return object_resolve_abs_path(child, parts + 1, typename);
2022 }
2023
2024 static Object *object_resolve_partial_path(Object *parent,
2025                                            char **parts,
2026                                            const char *typename,
2027                                            bool *ambiguous)
2028 {
2029     Object *obj;
2030     GHashTableIter iter;
2031     ObjectProperty *prop;
2032
2033     obj = object_resolve_abs_path(parent, parts, typename);
2034
2035     g_hash_table_iter_init(&iter, parent->properties);
2036     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2037         Object *found;
2038
2039         if (!object_property_is_child(prop)) {
2040             continue;
2041         }
2042
2043         found = object_resolve_partial_path(prop->opaque, parts,
2044                                             typename, ambiguous);
2045         if (found) {
2046             if (obj) {
2047                 *ambiguous = true;
2048                 return NULL;
2049             }
2050             obj = found;
2051         }
2052
2053         if (*ambiguous) {
2054             return NULL;
2055         }
2056     }
2057
2058     return obj;
2059 }
2060
2061 Object *object_resolve_path_type(const char *path, const char *typename,
2062                                  bool *ambiguousp)
2063 {
2064     Object *obj;
2065     char **parts;
2066
2067     parts = g_strsplit(path, "/", 0);
2068     assert(parts);
2069
2070     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
2071         bool ambiguous = false;
2072         obj = object_resolve_partial_path(object_get_root(), parts,
2073                                           typename, &ambiguous);
2074         if (ambiguousp) {
2075             *ambiguousp = ambiguous;
2076         }
2077     } else {
2078         obj = object_resolve_abs_path(object_get_root(), parts + 1, typename);
2079     }
2080
2081     g_strfreev(parts);
2082
2083     return obj;
2084 }
2085
2086 Object *object_resolve_path(const char *path, bool *ambiguous)
2087 {
2088     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
2089 }
2090
2091 typedef struct StringProperty
2092 {
2093     char *(*get)(Object *, Error **);
2094     void (*set)(Object *, const char *, Error **);
2095 } StringProperty;
2096
2097 static void property_get_str(Object *obj, Visitor *v, const char *name,
2098                              void *opaque, Error **errp)
2099 {
2100     StringProperty *prop = opaque;
2101     char *value;
2102     Error *err = NULL;
2103
2104     value = prop->get(obj, &err);
2105     if (err) {
2106         error_propagate(errp, err);
2107         return;
2108     }
2109
2110     visit_type_str(v, name, &value, errp);
2111     g_free(value);
2112 }
2113
2114 static void property_set_str(Object *obj, Visitor *v, const char *name,
2115                              void *opaque, Error **errp)
2116 {
2117     StringProperty *prop = opaque;
2118     char *value;
2119
2120     if (!visit_type_str(v, name, &value, errp)) {
2121         return;
2122     }
2123
2124     prop->set(obj, value, errp);
2125     g_free(value);
2126 }
2127
2128 static void property_release_str(Object *obj, const char *name,
2129                                  void *opaque)
2130 {
2131     StringProperty *prop = opaque;
2132     g_free(prop);
2133 }
2134
2135 ObjectProperty *
2136 object_property_add_str(Object *obj, const char *name,
2137                         char *(*get)(Object *, Error **),
2138                         void (*set)(Object *, const char *, Error **))
2139 {
2140     StringProperty *prop = g_malloc0(sizeof(*prop));
2141
2142     prop->get = get;
2143     prop->set = set;
2144
2145     return object_property_add(obj, name, "string",
2146                                get ? property_get_str : NULL,
2147                                set ? property_set_str : NULL,
2148                                property_release_str,
2149                                prop);
2150 }
2151
2152 ObjectProperty *
2153 object_class_property_add_str(ObjectClass *klass, const char *name,
2154                                    char *(*get)(Object *, Error **),
2155                                    void (*set)(Object *, const char *,
2156                                                Error **))
2157 {
2158     StringProperty *prop = g_malloc0(sizeof(*prop));
2159
2160     prop->get = get;
2161     prop->set = set;
2162
2163     return object_class_property_add(klass, name, "string",
2164                                      get ? property_get_str : NULL,
2165                                      set ? property_set_str : NULL,
2166                                      NULL,
2167                                      prop);
2168 }
2169
2170 typedef struct BoolProperty
2171 {
2172     bool (*get)(Object *, Error **);
2173     void (*set)(Object *, bool, Error **);
2174 } BoolProperty;
2175
2176 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2177                               void *opaque, Error **errp)
2178 {
2179     BoolProperty *prop = opaque;
2180     bool value;
2181     Error *err = NULL;
2182
2183     value = prop->get(obj, &err);
2184     if (err) {
2185         error_propagate(errp, err);
2186         return;
2187     }
2188
2189     visit_type_bool(v, name, &value, errp);
2190 }
2191
2192 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2193                               void *opaque, Error **errp)
2194 {
2195     BoolProperty *prop = opaque;
2196     bool value;
2197
2198     if (!visit_type_bool(v, name, &value, errp)) {
2199         return;
2200     }
2201
2202     prop->set(obj, value, errp);
2203 }
2204
2205 static void property_release_bool(Object *obj, const char *name,
2206                                   void *opaque)
2207 {
2208     BoolProperty *prop = opaque;
2209     g_free(prop);
2210 }
2211
2212 ObjectProperty *
2213 object_property_add_bool(Object *obj, const char *name,
2214                          bool (*get)(Object *, Error **),
2215                          void (*set)(Object *, bool, Error **))
2216 {
2217     BoolProperty *prop = g_malloc0(sizeof(*prop));
2218
2219     prop->get = get;
2220     prop->set = set;
2221
2222     return object_property_add(obj, name, "bool",
2223                                get ? property_get_bool : NULL,
2224                                set ? property_set_bool : NULL,
2225                                property_release_bool,
2226                                prop);
2227 }
2228
2229 ObjectProperty *
2230 object_class_property_add_bool(ObjectClass *klass, const char *name,
2231                                     bool (*get)(Object *, Error **),
2232                                     void (*set)(Object *, bool, Error **))
2233 {
2234     BoolProperty *prop = g_malloc0(sizeof(*prop));
2235
2236     prop->get = get;
2237     prop->set = set;
2238
2239     return object_class_property_add(klass, name, "bool",
2240                                      get ? property_get_bool : NULL,
2241                                      set ? property_set_bool : NULL,
2242                                      NULL,
2243                                      prop);
2244 }
2245
2246 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2247                               void *opaque, Error **errp)
2248 {
2249     EnumProperty *prop = opaque;
2250     int value;
2251     Error *err = NULL;
2252
2253     value = prop->get(obj, &err);
2254     if (err) {
2255         error_propagate(errp, err);
2256         return;
2257     }
2258
2259     visit_type_enum(v, name, &value, prop->lookup, errp);
2260 }
2261
2262 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2263                               void *opaque, Error **errp)
2264 {
2265     EnumProperty *prop = opaque;
2266     int value;
2267
2268     if (!visit_type_enum(v, name, &value, prop->lookup, errp)) {
2269         return;
2270     }
2271     prop->set(obj, value, errp);
2272 }
2273
2274 static void property_release_enum(Object *obj, const char *name,
2275                                   void *opaque)
2276 {
2277     EnumProperty *prop = opaque;
2278     g_free(prop);
2279 }
2280
2281 ObjectProperty *
2282 object_property_add_enum(Object *obj, const char *name,
2283                          const char *typename,
2284                          const QEnumLookup *lookup,
2285                          int (*get)(Object *, Error **),
2286                          void (*set)(Object *, int, Error **))
2287 {
2288     EnumProperty *prop = g_malloc(sizeof(*prop));
2289
2290     prop->lookup = lookup;
2291     prop->get = get;
2292     prop->set = set;
2293
2294     return object_property_add(obj, name, typename,
2295                                get ? property_get_enum : NULL,
2296                                set ? property_set_enum : NULL,
2297                                property_release_enum,
2298                                prop);
2299 }
2300
2301 ObjectProperty *
2302 object_class_property_add_enum(ObjectClass *klass, const char *name,
2303                                     const char *typename,
2304                                     const QEnumLookup *lookup,
2305                                     int (*get)(Object *, Error **),
2306                                     void (*set)(Object *, int, Error **))
2307 {
2308     EnumProperty *prop = g_malloc(sizeof(*prop));
2309
2310     prop->lookup = lookup;
2311     prop->get = get;
2312     prop->set = set;
2313
2314     return object_class_property_add(klass, name, typename,
2315                                      get ? property_get_enum : NULL,
2316                                      set ? property_set_enum : NULL,
2317                                      NULL,
2318                                      prop);
2319 }
2320
2321 typedef struct TMProperty {
2322     void (*get)(Object *, struct tm *, Error **);
2323 } TMProperty;
2324
2325 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2326                             void *opaque, Error **errp)
2327 {
2328     TMProperty *prop = opaque;
2329     Error *err = NULL;
2330     struct tm value;
2331
2332     prop->get(obj, &value, &err);
2333     if (err) {
2334         error_propagate(errp, err);
2335         return;
2336     }
2337
2338     if (!visit_start_struct(v, name, NULL, 0, errp)) {
2339         return;
2340     }
2341     if (!visit_type_int32(v, "tm_year", &value.tm_year, errp)) {
2342         goto out_end;
2343     }
2344     if (!visit_type_int32(v, "tm_mon", &value.tm_mon, errp)) {
2345         goto out_end;
2346     }
2347     if (!visit_type_int32(v, "tm_mday", &value.tm_mday, errp)) {
2348         goto out_end;
2349     }
2350     if (!visit_type_int32(v, "tm_hour", &value.tm_hour, errp)) {
2351         goto out_end;
2352     }
2353     if (!visit_type_int32(v, "tm_min", &value.tm_min, errp)) {
2354         goto out_end;
2355     }
2356     if (!visit_type_int32(v, "tm_sec", &value.tm_sec, errp)) {
2357         goto out_end;
2358     }
2359     visit_check_struct(v, errp);
2360 out_end:
2361     visit_end_struct(v, NULL);
2362 }
2363
2364 static void property_release_tm(Object *obj, const char *name,
2365                                 void *opaque)
2366 {
2367     TMProperty *prop = opaque;
2368     g_free(prop);
2369 }
2370
2371 ObjectProperty *
2372 object_property_add_tm(Object *obj, const char *name,
2373                        void (*get)(Object *, struct tm *, Error **))
2374 {
2375     TMProperty *prop = g_malloc0(sizeof(*prop));
2376
2377     prop->get = get;
2378
2379     return object_property_add(obj, name, "struct tm",
2380                                get ? property_get_tm : NULL, NULL,
2381                                property_release_tm,
2382                                prop);
2383 }
2384
2385 ObjectProperty *
2386 object_class_property_add_tm(ObjectClass *klass, const char *name,
2387                              void (*get)(Object *, struct tm *, Error **))
2388 {
2389     TMProperty *prop = g_malloc0(sizeof(*prop));
2390
2391     prop->get = get;
2392
2393     return object_class_property_add(klass, name, "struct tm",
2394                                      get ? property_get_tm : NULL,
2395                                      NULL, NULL, prop);
2396 }
2397
2398 static char *object_get_type(Object *obj, Error **errp)
2399 {
2400     return g_strdup(object_get_typename(obj));
2401 }
2402
2403 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2404                                    void *opaque, Error **errp)
2405 {
2406     uint8_t value = *(uint8_t *)opaque;
2407     visit_type_uint8(v, name, &value, errp);
2408 }
2409
2410 static void property_set_uint8_ptr(Object *obj, Visitor *v, const char *name,
2411                                    void *opaque, Error **errp)
2412 {
2413     uint8_t *field = opaque;
2414     uint8_t value;
2415
2416     if (!visit_type_uint8(v, name, &value, errp)) {
2417         return;
2418     }
2419
2420     *field = value;
2421 }
2422
2423 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2424                                     void *opaque, Error **errp)
2425 {
2426     uint16_t value = *(uint16_t *)opaque;
2427     visit_type_uint16(v, name, &value, errp);
2428 }
2429
2430 static void property_set_uint16_ptr(Object *obj, Visitor *v, const char *name,
2431                                     void *opaque, Error **errp)
2432 {
2433     uint16_t *field = opaque;
2434     uint16_t value;
2435
2436     if (!visit_type_uint16(v, name, &value, errp)) {
2437         return;
2438     }
2439
2440     *field = value;
2441 }
2442
2443 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2444                                     void *opaque, Error **errp)
2445 {
2446     uint32_t value = *(uint32_t *)opaque;
2447     visit_type_uint32(v, name, &value, errp);
2448 }
2449
2450 static void property_set_uint32_ptr(Object *obj, Visitor *v, const char *name,
2451                                     void *opaque, Error **errp)
2452 {
2453     uint32_t *field = opaque;
2454     uint32_t value;
2455
2456     if (!visit_type_uint32(v, name, &value, errp)) {
2457         return;
2458     }
2459
2460     *field = value;
2461 }
2462
2463 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2464                                     void *opaque, Error **errp)
2465 {
2466     uint64_t value = *(uint64_t *)opaque;
2467     visit_type_uint64(v, name, &value, errp);
2468 }
2469
2470 static void property_set_uint64_ptr(Object *obj, Visitor *v, const char *name,
2471                                     void *opaque, Error **errp)
2472 {
2473     uint64_t *field = opaque;
2474     uint64_t value;
2475
2476     if (!visit_type_uint64(v, name, &value, errp)) {
2477         return;
2478     }
2479
2480     *field = value;
2481 }
2482
2483 ObjectProperty *
2484 object_property_add_uint8_ptr(Object *obj, const char *name,
2485                               const uint8_t *v,
2486                               ObjectPropertyFlags flags)
2487 {
2488     ObjectPropertyAccessor *getter = NULL;
2489     ObjectPropertyAccessor *setter = NULL;
2490
2491     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2492         getter = property_get_uint8_ptr;
2493     }
2494
2495     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2496         setter = property_set_uint8_ptr;
2497     }
2498
2499     return object_property_add(obj, name, "uint8",
2500                                getter, setter, NULL, (void *)v);
2501 }
2502
2503 ObjectProperty *
2504 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2505                                     const uint8_t *v,
2506                                     ObjectPropertyFlags flags)
2507 {
2508     ObjectPropertyAccessor *getter = NULL;
2509     ObjectPropertyAccessor *setter = NULL;
2510
2511     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2512         getter = property_get_uint8_ptr;
2513     }
2514
2515     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2516         setter = property_set_uint8_ptr;
2517     }
2518
2519     return object_class_property_add(klass, name, "uint8",
2520                                      getter, setter, NULL, (void *)v);
2521 }
2522
2523 ObjectProperty *
2524 object_property_add_uint16_ptr(Object *obj, const char *name,
2525                                const uint16_t *v,
2526                                ObjectPropertyFlags flags)
2527 {
2528     ObjectPropertyAccessor *getter = NULL;
2529     ObjectPropertyAccessor *setter = NULL;
2530
2531     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2532         getter = property_get_uint16_ptr;
2533     }
2534
2535     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2536         setter = property_set_uint16_ptr;
2537     }
2538
2539     return object_property_add(obj, name, "uint16",
2540                                getter, setter, NULL, (void *)v);
2541 }
2542
2543 ObjectProperty *
2544 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2545                                      const uint16_t *v,
2546                                      ObjectPropertyFlags flags)
2547 {
2548     ObjectPropertyAccessor *getter = NULL;
2549     ObjectPropertyAccessor *setter = NULL;
2550
2551     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2552         getter = property_get_uint16_ptr;
2553     }
2554
2555     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2556         setter = property_set_uint16_ptr;
2557     }
2558
2559     return object_class_property_add(klass, name, "uint16",
2560                                      getter, setter, NULL, (void *)v);
2561 }
2562
2563 ObjectProperty *
2564 object_property_add_uint32_ptr(Object *obj, const char *name,
2565                                const uint32_t *v,
2566                                ObjectPropertyFlags flags)
2567 {
2568     ObjectPropertyAccessor *getter = NULL;
2569     ObjectPropertyAccessor *setter = NULL;
2570
2571     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2572         getter = property_get_uint32_ptr;
2573     }
2574
2575     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2576         setter = property_set_uint32_ptr;
2577     }
2578
2579     return object_property_add(obj, name, "uint32",
2580                                getter, setter, NULL, (void *)v);
2581 }
2582
2583 ObjectProperty *
2584 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2585                                      const uint32_t *v,
2586                                      ObjectPropertyFlags flags)
2587 {
2588     ObjectPropertyAccessor *getter = NULL;
2589     ObjectPropertyAccessor *setter = NULL;
2590
2591     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2592         getter = property_get_uint32_ptr;
2593     }
2594
2595     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2596         setter = property_set_uint32_ptr;
2597     }
2598
2599     return object_class_property_add(klass, name, "uint32",
2600                                      getter, setter, NULL, (void *)v);
2601 }
2602
2603 ObjectProperty *
2604 object_property_add_uint64_ptr(Object *obj, const char *name,
2605                                const uint64_t *v,
2606                                ObjectPropertyFlags flags)
2607 {
2608     ObjectPropertyAccessor *getter = NULL;
2609     ObjectPropertyAccessor *setter = NULL;
2610
2611     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2612         getter = property_get_uint64_ptr;
2613     }
2614
2615     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2616         setter = property_set_uint64_ptr;
2617     }
2618
2619     return object_property_add(obj, name, "uint64",
2620                                getter, setter, NULL, (void *)v);
2621 }
2622
2623 ObjectProperty *
2624 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2625                                      const uint64_t *v,
2626                                      ObjectPropertyFlags flags)
2627 {
2628     ObjectPropertyAccessor *getter = NULL;
2629     ObjectPropertyAccessor *setter = NULL;
2630
2631     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2632         getter = property_get_uint64_ptr;
2633     }
2634
2635     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2636         setter = property_set_uint64_ptr;
2637     }
2638
2639     return object_class_property_add(klass, name, "uint64",
2640                                      getter, setter, NULL, (void *)v);
2641 }
2642
2643 typedef struct {
2644     Object *target_obj;
2645     char *target_name;
2646 } AliasProperty;
2647
2648 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2649                                void *opaque, Error **errp)
2650 {
2651     AliasProperty *prop = opaque;
2652
2653     object_property_get(prop->target_obj, prop->target_name, v, errp);
2654 }
2655
2656 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2657                                void *opaque, Error **errp)
2658 {
2659     AliasProperty *prop = opaque;
2660
2661     object_property_set(prop->target_obj, prop->target_name, v, errp);
2662 }
2663
2664 static Object *property_resolve_alias(Object *obj, void *opaque,
2665                                       const char *part)
2666 {
2667     AliasProperty *prop = opaque;
2668
2669     return object_resolve_path_component(prop->target_obj, prop->target_name);
2670 }
2671
2672 static void property_release_alias(Object *obj, const char *name, void *opaque)
2673 {
2674     AliasProperty *prop = opaque;
2675
2676     g_free(prop->target_name);
2677     g_free(prop);
2678 }
2679
2680 ObjectProperty *
2681 object_property_add_alias(Object *obj, const char *name,
2682                           Object *target_obj, const char *target_name)
2683 {
2684     AliasProperty *prop;
2685     ObjectProperty *op;
2686     ObjectProperty *target_prop;
2687     g_autofree char *prop_type = NULL;
2688
2689     target_prop = object_property_find(target_obj, target_name,
2690                                        &error_abort);
2691
2692     if (object_property_is_child(target_prop)) {
2693         prop_type = g_strdup_printf("link%s",
2694                                     target_prop->type + strlen("child"));
2695     } else {
2696         prop_type = g_strdup(target_prop->type);
2697     }
2698
2699     prop = g_malloc(sizeof(*prop));
2700     prop->target_obj = target_obj;
2701     prop->target_name = g_strdup(target_name);
2702
2703     op = object_property_add(obj, name, prop_type,
2704                              property_get_alias,
2705                              property_set_alias,
2706                              property_release_alias,
2707                              prop);
2708     op->resolve = property_resolve_alias;
2709     if (target_prop->defval) {
2710         op->defval = qobject_ref(target_prop->defval);
2711     }
2712
2713     object_property_set_description(obj, op->name,
2714                                     target_prop->description);
2715     return op;
2716 }
2717
2718 void object_property_set_description(Object *obj, const char *name,
2719                                      const char *description)
2720 {
2721     ObjectProperty *op;
2722
2723     op = object_property_find(obj, name, &error_abort);
2724     g_free(op->description);
2725     op->description = g_strdup(description);
2726 }
2727
2728 void object_class_property_set_description(ObjectClass *klass,
2729                                            const char *name,
2730                                            const char *description)
2731 {
2732     ObjectProperty *op;
2733
2734     op = g_hash_table_lookup(klass->properties, name);
2735     g_free(op->description);
2736     op->description = g_strdup(description);
2737 }
2738
2739 static void object_class_init(ObjectClass *klass, void *data)
2740 {
2741     object_class_property_add_str(klass, "type", object_get_type,
2742                                   NULL);
2743 }
2744
2745 static void register_types(void)
2746 {
2747     static TypeInfo interface_info = {
2748         .name = TYPE_INTERFACE,
2749         .class_size = sizeof(InterfaceClass),
2750         .abstract = true,
2751     };
2752
2753     static TypeInfo object_info = {
2754         .name = TYPE_OBJECT,
2755         .instance_size = sizeof(Object),
2756         .class_init = object_class_init,
2757         .abstract = true,
2758     };
2759
2760     type_interface = type_register_internal(&interface_info);
2761     type_register_internal(&object_info);
2762 }
2763
2764 type_init(register_types)