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 "qemu/memalign.h"
  20 #include "qapi/visitor.h"
  21 #include "qapi/string-input-visitor.h"
  22 #include "qapi/string-output-visitor.h"
  23 #include "qapi/qobject-input-visitor.h"
  24 #include "qapi/forward-visitor.h"
  25 #include "qapi/qapi-builtin-visit.h"
  26 #include "qapi/qmp/qerror.h"
  27 #include "qapi/qmp/qjson.h"
  28 #include "trace.h"
  29
  30 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  31  * of the QOM core on QObject?  */
  32 #include "qom/qom-qobject.h"
  33 #include "qapi/qmp/qbool.h"
  34 #include "qapi/qmp/qlist.h"
  35 #include "qapi/qmp/qnum.h"
  36 #include "qapi/qmp/qstring.h"
  37 #include "qemu/error-report.h"
  38
  39 #define MAX_INTERFACES 32
  40
  41 typedef struct InterfaceImpl InterfaceImpl;
  42 typedef struct TypeImpl TypeImpl;
  43
  44 struct InterfaceImpl
  45 {
  46     const char *typename;
  47 };
  48
  49 struct TypeImpl
  50 {
  51     const char *name;
  52
  53     size_t class_size;
  54
  55     size_t instance_size;
  56     size_t instance_align;
  57
  58     void (*class_init)(ObjectClass *klass, void *data);
  59     void (*class_base_init)(ObjectClass *klass, void *data);
  60
  61     void *class_data;
  62
  63     void (*instance_init)(Object *obj);
  64     void (*instance_post_init)(Object *obj);
  65     void (*instance_finalize)(Object *obj);
  66
  67     bool abstract;
  68
  69     const char *parent;
  70     TypeImpl *parent_type;
  71
  72     ObjectClass *class;
  73
  74     int num_interfaces;
  75     InterfaceImpl interfaces[MAX_INTERFACES];
  76 };
  77
  78 static Type type_interface;
  79
  80 static GHashTable *type_table_get(void)
  81 {
  82     static GHashTable *type_table;
  83
  84     if (type_table == NULL) {
  85         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  86     }
  87
  88     return type_table;
  89 }
  90
  91 static bool enumerating_types;
  92
  93 static void type_table_add(TypeImpl *ti)
  94 {
  95     assert(!enumerating_types);
  96     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  97 }
  98
  99 static TypeImpl *type_table_lookup(const char *name)
 100 {
 101     return g_hash_table_lookup(type_table_get(), name);
 102 }
 103
 104 static TypeImpl *type_new(const TypeInfo *info)
 105 {
 106     TypeImpl *ti = g_malloc0(sizeof(*ti));
 107     int i;
 108
 109     g_assert(info->name != NULL);
 110
 111     if (type_table_lookup(info->name) != NULL) {
 112         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 113         abort();
 114     }
 115
 116     ti->name = g_strdup(info->name);
 117     ti->parent = g_strdup(info->parent);
 118
 119     ti->class_size = info->class_size;
 120     ti->instance_size = info->instance_size;
 121     ti->instance_align = info->instance_align;
 122
 123     ti->class_init = info->class_init;
 124     ti->class_base_init = info->class_base_init;
 125     ti->class_data = info->class_data;
 126
 127     ti->instance_init = info->instance_init;
 128     ti->instance_post_init = info->instance_post_init;
 129     ti->instance_finalize = info->instance_finalize;
 130
 131     ti->abstract = info->abstract;
 132
 133     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 134         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 135     }
 136     ti->num_interfaces = i;
 137
 138     return ti;
 139 }
 140
 141 static bool type_name_is_valid(const char *name)
 142 {
 143     const int slen = strlen(name);
 144     int plen;
 145
 146     g_assert(slen > 1);
 147
 148     /*
 149      * Ideally, the name should start with a letter - however, we've got
 150      * too many names starting with a digit already, so allow digits here,
 151      * too (except '0' which is not used yet)
 152      */
 153     if (!g_ascii_isalnum(name[0]) || name[0] == '0') {
 154         return false;
 155     }
 156
 157     plen = strspn(name, "abcdefghijklmnopqrstuvwxyz"
 158                         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 159                         "0123456789-_.");
 160
 161     /* Allow some legacy names with '+' in it for compatibility reasons */
 162     if (name[plen] == '+') {
 163         if (plen >= 17 && g_str_has_prefix(name, "Sun-UltraSparc-I")) {
 164             /* Allow "Sun-UltraSparc-IV+" and "Sun-UltraSparc-IIIi+" */
 165             return true;
 166         }
 167     }
 168
 169     return plen == slen;
 170 }
 171
 172 static TypeImpl *type_register_internal(const TypeInfo *info)
 173 {
 174     TypeImpl *ti;
 175
 176     if (!type_name_is_valid(info->name)) {
 177         fprintf(stderr, "Registering '%s' with illegal type name\n", info->name);
 178         abort();
 179     }
 180
 181     ti = type_new(info);
 182
 183     type_table_add(ti);
 184     return ti;
 185 }
 186
 187 TypeImpl *type_register(const TypeInfo *info)
 188 {
 189     assert(info->parent);
 190     return type_register_internal(info);
 191 }
 192
 193 TypeImpl *type_register_static(const TypeInfo *info)
 194 {
 195     return type_register(info);
 196 }
 197
 198 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 199 {
 200     int i;
 201
 202     for (i = 0; i < nr_infos; i++) {
 203         type_register_static(&infos[i]);
 204     }
 205 }
 206
 207 static TypeImpl *type_get_by_name(const char *name)
 208 {
 209     if (name == NULL) {
 210         return NULL;
 211     }
 212
 213     return type_table_lookup(name);
 214 }
 215
 216 static TypeImpl *type_get_parent(TypeImpl *type)
 217 {
 218     if (!type->parent_type && type->parent) {
 219         type->parent_type = type_get_by_name(type->parent);
 220         if (!type->parent_type) {
 221             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
 222                     type->name, type->parent);
 223             abort();
 224         }
 225     }
 226
 227     return type->parent_type;
 228 }
 229
 230 static bool type_has_parent(TypeImpl *type)
 231 {
 232     return (type->parent != NULL);
 233 }
 234
 235 static size_t type_class_get_size(TypeImpl *ti)
 236 {
 237     if (ti->class_size) {
 238         return ti->class_size;
 239     }
 240
 241     if (type_has_parent(ti)) {
 242         return type_class_get_size(type_get_parent(ti));
 243     }
 244
 245     return sizeof(ObjectClass);
 246 }
 247
 248 static size_t type_object_get_size(TypeImpl *ti)
 249 {
 250     if (ti->instance_size) {
 251         return ti->instance_size;
 252     }
 253
 254     if (type_has_parent(ti)) {
 255         return type_object_get_size(type_get_parent(ti));
 256     }
 257
 258     return 0;
 259 }
 260
 261 static size_t type_object_get_align(TypeImpl *ti)
 262 {
 263     if (ti->instance_align) {
 264         return ti->instance_align;
 265     }
 266
 267     if (type_has_parent(ti)) {
 268         return type_object_get_align(type_get_parent(ti));
 269     }
 270
 271     return 0;
 272 }
 273
 274 size_t object_type_get_instance_size(const char *typename)
 275 {
 276     TypeImpl *type = type_get_by_name(typename);
 277
 278     g_assert(type != NULL);
 279     return type_object_get_size(type);
 280 }
 281
 282 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 283 {
 284     assert(target_type);
 285
 286     /* Check if target_type is a direct ancestor of type */
 287     while (type) {
 288         if (type == target_type) {
 289             return true;
 290         }
 291
 292         type = type_get_parent(type);
 293     }
 294
 295     return false;
 296 }
 297
 298 static void type_initialize(TypeImpl *ti);
 299
 300 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 301                                       TypeImpl *parent_type)
 302 {
 303     InterfaceClass *new_iface;
 304     TypeInfo info = { };
 305     TypeImpl *iface_impl;
 306
 307     info.parent = parent_type->name;
 308     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 309     info.abstract = true;
 310
 311     iface_impl = type_new(&info);
 312     iface_impl->parent_type = parent_type;
 313     type_initialize(iface_impl);
 314     g_free((char *)info.name);
 315
 316     new_iface = (InterfaceClass *)iface_impl->class;
 317     new_iface->concrete_class = ti->class;
 318     new_iface->interface_type = interface_type;
 319
 320     ti->class->interfaces = g_slist_append(ti->class->interfaces, new_iface);
 321 }
 322
 323 static void object_property_free(gpointer data)
 324 {
 325     ObjectProperty *prop = data;
 326
 327     if (prop->defval) {
 328         qobject_unref(prop->defval);
 329         prop->defval = NULL;
 330     }
 331     g_free(prop->name);
 332     g_free(prop->type);
 333     g_free(prop->description);
 334     g_free(prop);
 335 }
 336
 337 static void type_initialize(TypeImpl *ti)
 338 {
 339     TypeImpl *parent;
 340
 341     if (ti->class) {
 342         return;
 343     }
 344
 345     ti->class_size = type_class_get_size(ti);
 346     ti->instance_size = type_object_get_size(ti);
 347     ti->instance_align = type_object_get_align(ti);
 348     /* Any type with zero instance_size is implicitly abstract.
 349      * This means interface types are all abstract.
 350      */
 351     if (ti->instance_size == 0) {
 352         ti->abstract = true;
 353     }
 354     if (type_is_ancestor(ti, type_interface)) {
 355         assert(ti->instance_size == 0);
 356         assert(ti->abstract);
 357         assert(!ti->instance_init);
 358         assert(!ti->instance_post_init);
 359         assert(!ti->instance_finalize);
 360         assert(!ti->num_interfaces);
 361     }
 362     ti->class = g_malloc0(ti->class_size);
 363
 364     parent = type_get_parent(ti);
 365     if (parent) {
 366         type_initialize(parent);
 367         GSList *e;
 368         int i;
 369
 370         g_assert(parent->class_size <= ti->class_size);
 371         g_assert(parent->instance_size <= ti->instance_size);
 372         memcpy(ti->class, parent->class, parent->class_size);
 373         ti->class->interfaces = NULL;
 374
 375         for (e = parent->class->interfaces; e; e = e->next) {
 376             InterfaceClass *iface = e->data;
 377             ObjectClass *klass = OBJECT_CLASS(iface);
 378
 379             type_initialize_interface(ti, iface->interface_type, klass->type);
 380         }
 381
 382         for (i = 0; i < ti->num_interfaces; i++) {
 383             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 384             if (!t) {
 385                 error_report("missing interface '%s' for object '%s'",
 386                              ti->interfaces[i].typename, parent->name);
 387                 abort();
 388             }
 389             for (e = ti->class->interfaces; e; e = e->next) {
 390                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 391
 392                 if (type_is_ancestor(target_type, t)) {
 393                     break;
 394                 }
 395             }
 396
 397             if (e) {
 398                 continue;
 399             }
 400
 401             type_initialize_interface(ti, t, t);
 402         }
 403     }
 404
 405     ti->class->properties = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
 406                                                   object_property_free);
 407
 408     ti->class->type = ti;
 409
 410     while (parent) {
 411         if (parent->class_base_init) {
 412             parent->class_base_init(ti->class, ti->class_data);
 413         }
 414         parent = type_get_parent(parent);
 415     }
 416
 417     if (ti->class_init) {
 418         ti->class_init(ti->class, ti->class_data);
 419     }
 420 }
 421
 422 static void object_init_with_type(Object *obj, TypeImpl *ti)
 423 {
 424     if (type_has_parent(ti)) {
 425         object_init_with_type(obj, type_get_parent(ti));
 426     }
 427
 428     if (ti->instance_init) {
 429         ti->instance_init(obj);
 430     }
 431 }
 432
 433 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 434 {
 435     if (ti->instance_post_init) {
 436         ti->instance_post_init(obj);
 437     }
 438
 439     if (type_has_parent(ti)) {
 440         object_post_init_with_type(obj, type_get_parent(ti));
 441     }
 442 }
 443
 444 bool object_apply_global_props(Object *obj, const GPtrArray *props,
 445                                Error **errp)
 446 {
 447     int i;
 448
 449     if (!props) {
 450         return true;
 451     }
 452
 453     for (i = 0; i < props->len; i++) {
 454         GlobalProperty *p = g_ptr_array_index(props, i);
 455         Error *err = NULL;
 456
 457         if (object_dynamic_cast(obj, p->driver) == NULL) {
 458             continue;
 459         }
 460         if (p->optional && !object_property_find(obj, p->property)) {
 461             continue;
 462         }
 463         p->used = true;
 464         if (!object_property_parse(obj, p->property, p->value, &err)) {
 465             error_prepend(&err, "can't apply global %s.%s=%s: ",
 466                           p->driver, p->property, p->value);
 467             /*
 468              * If errp != NULL, propagate error and return.
 469              * If errp == NULL, report a warning, but keep going
 470              * with the remaining globals.
 471              */
 472             if (errp) {
 473                 error_propagate(errp, err);
 474                 return false;
 475             } else {
 476                 warn_report_err(err);
 477             }
 478         }
 479     }
 480
 481     return true;
 482 }
 483
 484 /*
 485  * Global property defaults
 486  * Slot 0: accelerator's global property defaults
 487  * Slot 1: machine's global property defaults
 488  * Slot 2: global properties from legacy command line option
 489  * Each is a GPtrArray of of GlobalProperty.
 490  * Applied in order, later entries override earlier ones.
 491  */
 492 static GPtrArray *object_compat_props[3];
 493
 494 /*
 495  * Retrieve @GPtrArray for global property defined with options
 496  * other than "-global".  These are generally used for syntactic
 497  * sugar and legacy command line options.
 498  */
 499 void object_register_sugar_prop(const char *driver, const char *prop,
 500                                 const char *value, bool optional)
 501 {
 502     GlobalProperty *g;
 503     if (!object_compat_props[2]) {
 504         object_compat_props[2] = g_ptr_array_new();
 505     }
 506     g = g_new0(GlobalProperty, 1);
 507     g->driver = g_strdup(driver);
 508     g->property = g_strdup(prop);
 509     g->value = g_strdup(value);
 510     g->optional = optional;
 511     g_ptr_array_add(object_compat_props[2], g);
 512 }
 513
 514 /*
 515  * Set machine's global property defaults to @compat_props.
 516  * May be called at most once.
 517  */
 518 void object_set_machine_compat_props(GPtrArray *compat_props)
 519 {
 520     assert(!object_compat_props[1]);
 521     object_compat_props[1] = compat_props;
 522 }
 523
 524 /*
 525  * Set accelerator's global property defaults to @compat_props.
 526  * May be called at most once.
 527  */
 528 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 529 {
 530     assert(!object_compat_props[0]);
 531     object_compat_props[0] = compat_props;
 532 }
 533
 534 void object_apply_compat_props(Object *obj)
 535 {
 536     int i;
 537
 538     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 539         object_apply_global_props(obj, object_compat_props[i],
 540                                   i == 2 ? &error_fatal : &error_abort);
 541     }
 542 }
 543
 544 static void object_class_property_init_all(Object *obj)
 545 {
 546     ObjectPropertyIterator iter;
 547     ObjectProperty *prop;
 548
 549     object_class_property_iter_init(&iter, object_get_class(obj));
 550     while ((prop = object_property_iter_next(&iter))) {
 551         if (prop->init) {
 552             prop->init(obj, prop);
 553         }
 554     }
 555 }
 556
 557 static void object_initialize_with_type(Object *obj, size_t size, TypeImpl *type)
 558 {
 559     type_initialize(type);
 560
 561     g_assert(type->instance_size >= sizeof(Object));
 562     g_assert(type->abstract == false);
 563     g_assert(size >= type->instance_size);
 564
 565     memset(obj, 0, type->instance_size);
 566     obj->class = type->class;
 567     object_ref(obj);
 568     object_class_property_init_all(obj);
 569     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 570                                             NULL, object_property_free);
 571     object_init_with_type(obj, type);
 572     object_post_init_with_type(obj, type);
 573 }
 574
 575 void object_initialize(void *data, size_t size, const char *typename)
 576 {
 577     TypeImpl *type = type_get_by_name(typename);
 578
 579 #ifdef CONFIG_MODULES
 580     if (!type) {
 581         int rv = module_load_qom(typename, &error_fatal);
 582         if (rv > 0) {
 583             type = type_get_by_name(typename);
 584         } else {
 585             error_report("missing object type '%s'", typename);
 586             exit(1);
 587         }
 588     }
 589 #endif
 590     if (!type) {
 591         error_report("missing object type '%s'", typename);
 592         abort();
 593     }
 594
 595     object_initialize_with_type(data, size, type);
 596 }
 597
 598 bool object_initialize_child_with_props(Object *parentobj,
 599                                         const char *propname,
 600                                         void *childobj, size_t size,
 601                                         const char *type,
 602                                         Error **errp, ...)
 603 {
 604     va_list vargs;
 605     bool ok;
 606
 607     va_start(vargs, errp);
 608     ok = object_initialize_child_with_propsv(parentobj, propname,
 609                                              childobj, size, type, errp,
 610                                              vargs);
 611     va_end(vargs);
 612     return ok;
 613 }
 614
 615 bool object_initialize_child_with_propsv(Object *parentobj,
 616                                          const char *propname,
 617                                          void *childobj, size_t size,
 618                                          const char *type,
 619                                          Error **errp, va_list vargs)
 620 {
 621     bool ok = false;
 622     Object *obj;
 623     UserCreatable *uc;
 624
 625     object_initialize(childobj, size, type);
 626     obj = OBJECT(childobj);
 627
 628     if (!object_set_propv(obj, errp, vargs)) {
 629         goto out;
 630     }
 631
 632     object_property_add_child(parentobj, propname, obj);
 633
 634     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 635     if (uc) {
 636         if (!user_creatable_complete(uc, errp)) {
 637             object_unparent(obj);
 638             goto out;
 639         }
 640     }
 641
 642     ok = true;
 643
 644 out:
 645     /*
 646      * We want @obj's reference to be 1 on success, 0 on failure.
 647      * On success, it's 2: one taken by object_initialize(), and one
 648      * by object_property_add_child().
 649      * On failure in object_initialize() or earlier, it's 1.
 650      * On failure afterwards, it's also 1: object_unparent() releases
 651      * the reference taken by object_property_add_child().
 652      */
 653     object_unref(obj);
 654     return ok;
 655 }
 656
 657 void object_initialize_child_internal(Object *parent,
 658                                       const char *propname,
 659                                       void *child, size_t size,
 660                                       const char *type)
 661 {
 662     object_initialize_child_with_props(parent, propname, child, size, type,
 663                                        &error_abort, NULL);
 664 }
 665
 666 static inline bool object_property_is_child(ObjectProperty *prop)
 667 {
 668     return strstart(prop->type, "child<", NULL);
 669 }
 670
 671 static void object_property_del_all(Object *obj)
 672 {
 673     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
 674     ObjectProperty *prop;
 675     ObjectPropertyIterator iter;
 676     bool released;
 677
 678     do {
 679         released = false;
 680         object_property_iter_init(&iter, obj);
 681         while ((prop = object_property_iter_next(&iter)) != NULL) {
 682             if (g_hash_table_add(done, prop)) {
 683                 if (prop->release) {
 684                     prop->release(obj, prop->name, prop->opaque);
 685                     released = true;
 686                     break;
 687                 }
 688             }
 689         }
 690     } while (released);
 691
 692     g_hash_table_unref(obj->properties);
 693 }
 694
 695 static void object_property_del_child(Object *obj, Object *child)
 696 {
 697     ObjectProperty *prop;
 698     GHashTableIter iter;
 699     gpointer key, value;
 700
 701     g_hash_table_iter_init(&iter, obj->properties);
 702     while (g_hash_table_iter_next(&iter, &key, &value)) {
 703         prop = value;
 704         if (object_property_is_child(prop) && prop->opaque == child) {
 705             if (prop->release) {
 706                 prop->release(obj, prop->name, prop->opaque);
 707                 prop->release = NULL;
 708             }
 709             break;
 710         }
 711     }
 712     g_hash_table_iter_init(&iter, obj->properties);
 713     while (g_hash_table_iter_next(&iter, &key, &value)) {
 714         prop = value;
 715         if (object_property_is_child(prop) && prop->opaque == child) {
 716             g_hash_table_iter_remove(&iter);
 717             break;
 718         }
 719     }
 720 }
 721
 722 void object_unparent(Object *obj)
 723 {
 724     if (obj->parent) {
 725         object_property_del_child(obj->parent, obj);
 726     }
 727 }
 728
 729 static void object_deinit(Object *obj, TypeImpl *type)
 730 {
 731     if (type->instance_finalize) {
 732         type->instance_finalize(obj);
 733     }
 734
 735     if (type_has_parent(type)) {
 736         object_deinit(obj, type_get_parent(type));
 737     }
 738 }
 739
 740 static void object_finalize(void *data)
 741 {
 742     Object *obj = data;
 743     TypeImpl *ti = obj->class->type;
 744
 745     object_property_del_all(obj);
 746     object_deinit(obj, ti);
 747
 748     g_assert(obj->ref == 0);
 749     g_assert(obj->parent == NULL);
 750     if (obj->free) {
 751         obj->free(obj);
 752     }
 753 }
 754
 755 /* Find the minimum alignment guaranteed by the system malloc. */
 756 #if __STDC_VERSION__ >= 201112L
 757 typedef max_align_t qemu_max_align_t;
 758 #else
 759 typedef union {
 760     long l;
 761     void *p;
 762     double d;
 763     long double ld;
 764 } qemu_max_align_t;
 765 #endif
 766
 767 static Object *object_new_with_type(Type type)
 768 {
 769     Object *obj;
 770     size_t size, align;
 771     void (*obj_free)(void *);
 772
 773     g_assert(type != NULL);
 774     type_initialize(type);
 775
 776     size = type->instance_size;
 777     align = type->instance_align;
 778
 779     /*
 780      * Do not use qemu_memalign unless required.  Depending on the
 781      * implementation, extra alignment implies extra overhead.
 782      */
 783     if (likely(align <= __alignof__(qemu_max_align_t))) {
 784         obj = g_malloc(size);
 785         obj_free = g_free;
 786     } else {
 787         obj = qemu_memalign(align, size);
 788         obj_free = qemu_vfree;
 789     }
 790
 791     object_initialize_with_type(obj, size, type);
 792     obj->free = obj_free;
 793
 794     return obj;
 795 }
 796
 797 Object *object_new_with_class(ObjectClass *klass)
 798 {
 799     return object_new_with_type(klass->type);
 800 }
 801
 802 Object *object_new(const char *typename)
 803 {
 804     TypeImpl *ti = type_get_by_name(typename);
 805
 806     return object_new_with_type(ti);
 807 }
 808
 809
 810 Object *object_new_with_props(const char *typename,
 811                               Object *parent,
 812                               const char *id,
 813                               Error **errp,
 814                               ...)
 815 {
 816     va_list vargs;
 817     Object *obj;
 818
 819     va_start(vargs, errp);
 820     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 821     va_end(vargs);
 822
 823     return obj;
 824 }
 825
 826
 827 Object *object_new_with_propv(const char *typename,
 828                               Object *parent,
 829                               const char *id,
 830                               Error **errp,
 831                               va_list vargs)
 832 {
 833     Object *obj;
 834     ObjectClass *klass;
 835     UserCreatable *uc;
 836
 837     klass = object_class_by_name(typename);
 838     if (!klass) {
 839         error_setg(errp, "invalid object type: %s", typename);
 840         return NULL;
 841     }
 842
 843     if (object_class_is_abstract(klass)) {
 844         error_setg(errp, "object type '%s' is abstract", typename);
 845         return NULL;
 846     }
 847     obj = object_new_with_type(klass->type);
 848
 849     if (!object_set_propv(obj, errp, vargs)) {
 850         goto error;
 851     }
 852
 853     if (id != NULL) {
 854         object_property_add_child(parent, id, obj);
 855     }
 856
 857     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 858     if (uc) {
 859         if (!user_creatable_complete(uc, errp)) {
 860             if (id != NULL) {
 861                 object_unparent(obj);
 862             }
 863             goto error;
 864         }
 865     }
 866
 867     object_unref(obj);
 868     return obj;
 869
 870  error:
 871     object_unref(obj);
 872     return NULL;
 873 }
 874
 875
 876 bool object_set_props(Object *obj,
 877                      Error **errp,
 878                      ...)
 879 {
 880     va_list vargs;
 881     bool ret;
 882
 883     va_start(vargs, errp);
 884     ret = object_set_propv(obj, errp, vargs);
 885     va_end(vargs);
 886
 887     return ret;
 888 }
 889
 890
 891 bool object_set_propv(Object *obj,
 892                      Error **errp,
 893                      va_list vargs)
 894 {
 895     const char *propname;
 896
 897     propname = va_arg(vargs, char *);
 898     while (propname != NULL) {
 899         const char *value = va_arg(vargs, char *);
 900
 901         g_assert(value != NULL);
 902         if (!object_property_parse(obj, propname, value, errp)) {
 903             return false;
 904         }
 905         propname = va_arg(vargs, char *);
 906     }
 907
 908     return true;
 909 }
 910
 911
 912 Object *object_dynamic_cast(Object *obj, const char *typename)
 913 {
 914     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 915         return obj;
 916     }
 917
 918     return NULL;
 919 }
 920
 921 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 922                                    const char *file, int line, const char *func)
 923 {
 924     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 925                                      typename, file, line, func);
 926
 927 #ifdef CONFIG_QOM_CAST_DEBUG
 928     int i;
 929     Object *inst;
 930
 931     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 932         if (qatomic_read(&obj->class->object_cast_cache[i]) == typename) {
 933             goto out;
 934         }
 935     }
 936
 937     inst = object_dynamic_cast(obj, typename);
 938
 939     if (!inst && obj) {
 940         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 941                 file, line, func, obj, typename);
 942         abort();
 943     }
 944
 945     assert(obj == inst);
 946
 947     if (obj && obj == inst) {
 948         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 949             qatomic_set(&obj->class->object_cast_cache[i - 1],
 950                        qatomic_read(&obj->class->object_cast_cache[i]));
 951         }
 952         qatomic_set(&obj->class->object_cast_cache[i - 1], typename);
 953     }
 954
 955 out:
 956 #endif
 957     return obj;
 958 }
 959
 960 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 961                                        const char *typename)
 962 {
 963     ObjectClass *ret = NULL;
 964     TypeImpl *target_type;
 965     TypeImpl *type;
 966
 967     if (!class) {
 968         return NULL;
 969     }
 970
 971     /* A simple fast path that can trigger a lot for leaf classes.  */
 972     type = class->type;
 973     if (type->name == typename) {
 974         return class;
 975     }
 976
 977     target_type = type_get_by_name(typename);
 978     if (!target_type) {
 979         /* target class type unknown, so fail the cast */
 980         return NULL;
 981     }
 982
 983     if (type->class->interfaces &&
 984             type_is_ancestor(target_type, type_interface)) {
 985         int found = 0;
 986         GSList *i;
 987
 988         for (i = class->interfaces; i; i = i->next) {
 989             ObjectClass *target_class = i->data;
 990
 991             if (type_is_ancestor(target_class->type, target_type)) {
 992                 ret = target_class;
 993                 found++;
 994             }
 995          }
 996
 997         /* The match was ambiguous, don't allow a cast */
 998         if (found > 1) {
 999             ret = NULL;
1000         }
1001     } else if (type_is_ancestor(type, target_type)) {
1002         ret = class;
1003     }
1004
1005     return ret;
1006 }
1007
1008 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
1009                                               const char *typename,
1010                                               const char *file, int line,
1011                                               const char *func)
1012 {
1013     ObjectClass *ret;
1014
1015     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
1016                                            typename, file, line, func);
1017
1018 #ifdef CONFIG_QOM_CAST_DEBUG
1019     int i;
1020
1021     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
1022         if (qatomic_read(&class->class_cast_cache[i]) == typename) {
1023             ret = class;
1024             goto out;
1025         }
1026     }
1027 #else
1028     if (!class || !class->interfaces) {
1029         return class;
1030     }
1031 #endif
1032
1033     ret = object_class_dynamic_cast(class, typename);
1034     if (!ret && class) {
1035         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
1036                 file, line, func, class, typename);
1037         abort();
1038     }
1039
1040 #ifdef CONFIG_QOM_CAST_DEBUG
1041     if (class && ret == class) {
1042         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
1043             qatomic_set(&class->class_cast_cache[i - 1],
1044                        qatomic_read(&class->class_cast_cache[i]));
1045         }
1046         qatomic_set(&class->class_cast_cache[i - 1], typename);
1047     }
1048 out:
1049 #endif
1050     return ret;
1051 }
1052
1053 const char *object_get_typename(const Object *obj)
1054 {
1055     return obj->class->type->name;
1056 }
1057
1058 ObjectClass *object_get_class(Object *obj)
1059 {
1060     return obj->class;
1061 }
1062
1063 bool object_class_is_abstract(ObjectClass *klass)
1064 {
1065     return klass->type->abstract;
1066 }
1067
1068 const char *object_class_get_name(ObjectClass *klass)
1069 {
1070     return klass->type->name;
1071 }
1072
1073 ObjectClass *object_class_by_name(const char *typename)
1074 {
1075     TypeImpl *type = type_get_by_name(typename);
1076
1077     if (!type) {
1078         return NULL;
1079     }
1080
1081     type_initialize(type);
1082
1083     return type->class;
1084 }
1085
1086 ObjectClass *module_object_class_by_name(const char *typename)
1087 {
1088     ObjectClass *oc;
1089
1090     oc = object_class_by_name(typename);
1091 #ifdef CONFIG_MODULES
1092     if (!oc) {
1093         Error *local_err = NULL;
1094         int rv = module_load_qom(typename, &local_err);
1095         if (rv > 0) {
1096             oc = object_class_by_name(typename);
1097         } else if (rv < 0) {
1098             error_report_err(local_err);
1099         }
1100     }
1101 #endif
1102     return oc;
1103 }
1104
1105 ObjectClass *object_class_get_parent(ObjectClass *class)
1106 {
1107     TypeImpl *type = type_get_parent(class->type);
1108
1109     if (!type) {
1110         return NULL;
1111     }
1112
1113     type_initialize(type);
1114
1115     return type->class;
1116 }
1117
1118 typedef struct OCFData
1119 {
1120     void (*fn)(ObjectClass *klass, void *opaque);
1121     const char *implements_type;
1122     bool include_abstract;
1123     void *opaque;
1124 } OCFData;
1125
1126 static void object_class_foreach_tramp(gpointer key, gpointer value,
1127                                        gpointer opaque)
1128 {
1129     OCFData *data = opaque;
1130     TypeImpl *type = value;
1131     ObjectClass *k;
1132
1133     type_initialize(type);
1134     k = type->class;
1135
1136     if (!data->include_abstract && type->abstract) {
1137         return;
1138     }
1139
1140     if (data->implements_type &&
1141         !object_class_dynamic_cast(k, data->implements_type)) {
1142         return;
1143     }
1144
1145     data->fn(k, data->opaque);
1146 }
1147
1148 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
1149                           const char *implements_type, bool include_abstract,
1150                           void *opaque)
1151 {
1152     OCFData data = { fn, implements_type, include_abstract, opaque };
1153
1154     enumerating_types = true;
1155     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
1156     enumerating_types = false;
1157 }
1158
1159 static int do_object_child_foreach(Object *obj,
1160                                    int (*fn)(Object *child, void *opaque),
1161                                    void *opaque, bool recurse)
1162 {
1163     GHashTableIter iter;
1164     ObjectProperty *prop;
1165     int ret = 0;
1166
1167     g_hash_table_iter_init(&iter, obj->properties);
1168     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1169         if (object_property_is_child(prop)) {
1170             Object *child = prop->opaque;
1171
1172             ret = fn(child, opaque);
1173             if (ret != 0) {
1174                 break;
1175             }
1176             if (recurse) {
1177                 ret = do_object_child_foreach(child, fn, opaque, true);
1178                 if (ret != 0) {
1179                     break;
1180                 }
1181             }
1182         }
1183     }
1184     return ret;
1185 }
1186
1187 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1188                          void *opaque)
1189 {
1190     return do_object_child_foreach(obj, fn, opaque, false);
1191 }
1192
1193 int object_child_foreach_recursive(Object *obj,
1194                                    int (*fn)(Object *child, void *opaque),
1195                                    void *opaque)
1196 {
1197     return do_object_child_foreach(obj, fn, opaque, true);
1198 }
1199
1200 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1201 {
1202     GSList **list = opaque;
1203
1204     *list = g_slist_prepend(*list, klass);
1205 }
1206
1207 GSList *object_class_get_list(const char *implements_type,
1208                               bool include_abstract)
1209 {
1210     GSList *list = NULL;
1211
1212     object_class_foreach(object_class_get_list_tramp,
1213                          implements_type, include_abstract, &list);
1214     return list;
1215 }
1216
1217 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1218 {
1219     return strcasecmp(object_class_get_name((ObjectClass *)a),
1220                       object_class_get_name((ObjectClass *)b));
1221 }
1222
1223 GSList *object_class_get_list_sorted(const char *implements_type,
1224                                      bool include_abstract)
1225 {
1226     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1227                         object_class_cmp);
1228 }
1229
1230 Object *object_ref(void *objptr)
1231 {
1232     Object *obj = OBJECT(objptr);
1233     uint32_t ref;
1234
1235     if (!obj) {
1236         return NULL;
1237     }
1238     ref = qatomic_fetch_inc(&obj->ref);
1239     /* Assert waaay before the integer overflows */
1240     g_assert(ref < INT_MAX);
1241     return obj;
1242 }
1243
1244 void object_unref(void *objptr)
1245 {
1246     Object *obj = OBJECT(objptr);
1247     if (!obj) {
1248         return;
1249     }
1250     g_assert(obj->ref > 0);
1251
1252     /* parent always holds a reference to its children */
1253     if (qatomic_fetch_dec(&obj->ref) == 1) {
1254         object_finalize(obj);
1255     }
1256 }
1257
1258 ObjectProperty *
1259 object_property_try_add(Object *obj, const char *name, const char *type,
1260                         ObjectPropertyAccessor *get,
1261                         ObjectPropertyAccessor *set,
1262                         ObjectPropertyRelease *release,
1263                         void *opaque, Error **errp)
1264 {
1265     ObjectProperty *prop;
1266     size_t name_len = strlen(name);
1267
1268     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1269         int i;
1270         ObjectProperty *ret = NULL;
1271         char *name_no_array = g_strdup(name);
1272
1273         name_no_array[name_len - 3] = '\0';
1274         for (i = 0; i < INT16_MAX; ++i) {
1275             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1276
1277             ret = object_property_try_add(obj, full_name, type, get, set,
1278                                           release, opaque, NULL);
1279             g_free(full_name);
1280             if (ret) {
1281                 break;
1282             }
1283         }
1284         g_free(name_no_array);
1285         assert(ret);
1286         return ret;
1287     }
1288
1289     if (object_property_find(obj, name) != NULL) {
1290         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1291                    name, object_get_typename(obj));
1292         return NULL;
1293     }
1294
1295     prop = g_malloc0(sizeof(*prop));
1296
1297     prop->name = g_strdup(name);
1298     prop->type = g_strdup(type);
1299
1300     prop->get = get;
1301     prop->set = set;
1302     prop->release = release;
1303     prop->opaque = opaque;
1304
1305     g_hash_table_insert(obj->properties, prop->name, prop);
1306     return prop;
1307 }
1308
1309 ObjectProperty *
1310 object_property_add(Object *obj, const char *name, const char *type,
1311                     ObjectPropertyAccessor *get,
1312                     ObjectPropertyAccessor *set,
1313                     ObjectPropertyRelease *release,
1314                     void *opaque)
1315 {
1316     return object_property_try_add(obj, name, type, get, set, release,
1317                                    opaque, &error_abort);
1318 }
1319
1320 ObjectProperty *
1321 object_class_property_add(ObjectClass *klass,
1322                           const char *name,
1323                           const char *type,
1324                           ObjectPropertyAccessor *get,
1325                           ObjectPropertyAccessor *set,
1326                           ObjectPropertyRelease *release,
1327                           void *opaque)
1328 {
1329     ObjectProperty *prop;
1330
1331     assert(!object_class_property_find(klass, name));
1332
1333     prop = g_malloc0(sizeof(*prop));
1334
1335     prop->name = g_strdup(name);
1336     prop->type = g_strdup(type);
1337
1338     prop->get = get;
1339     prop->set = set;
1340     prop->release = release;
1341     prop->opaque = opaque;
1342
1343     g_hash_table_insert(klass->properties, prop->name, prop);
1344
1345     return prop;
1346 }
1347
1348 ObjectProperty *object_property_find(Object *obj, const char *name)
1349 {
1350     ObjectProperty *prop;
1351     ObjectClass *klass = object_get_class(obj);
1352
1353     prop = object_class_property_find(klass, name);
1354     if (prop) {
1355         return prop;
1356     }
1357
1358     return g_hash_table_lookup(obj->properties, name);
1359 }
1360
1361 ObjectProperty *object_property_find_err(Object *obj, const char *name,
1362                                          Error **errp)
1363 {
1364     ObjectProperty *prop = object_property_find(obj, name);
1365     if (!prop) {
1366         error_setg(errp, "Property '%s.%s' not found",
1367                    object_get_typename(obj), name);
1368     }
1369     return prop;
1370 }
1371
1372 void object_property_iter_init(ObjectPropertyIterator *iter,
1373                                Object *obj)
1374 {
1375     g_hash_table_iter_init(&iter->iter, obj->properties);
1376     iter->nextclass = object_get_class(obj);
1377 }
1378
1379 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1380 {
1381     gpointer key, val;
1382     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1383         if (!iter->nextclass) {
1384             return NULL;
1385         }
1386         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1387         iter->nextclass = object_class_get_parent(iter->nextclass);
1388     }
1389     return val;
1390 }
1391
1392 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1393                                      ObjectClass *klass)
1394 {
1395     g_hash_table_iter_init(&iter->iter, klass->properties);
1396     iter->nextclass = object_class_get_parent(klass);
1397 }
1398
1399 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name)
1400 {
1401     ObjectClass *parent_klass;
1402
1403     parent_klass = object_class_get_parent(klass);
1404     if (parent_klass) {
1405         ObjectProperty *prop =
1406             object_class_property_find(parent_klass, name);
1407         if (prop) {
1408             return prop;
1409         }
1410     }
1411
1412     return g_hash_table_lookup(klass->properties, name);
1413 }
1414
1415 ObjectProperty *object_class_property_find_err(ObjectClass *klass,
1416                                                const char *name,
1417                                                Error **errp)
1418 {
1419     ObjectProperty *prop = object_class_property_find(klass, name);
1420     if (!prop) {
1421         error_setg(errp, "Property '.%s' not found", name);
1422     }
1423     return prop;
1424 }
1425
1426
1427 void object_property_del(Object *obj, const char *name)
1428 {
1429     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1430
1431     if (prop->release) {
1432         prop->release(obj, name, prop->opaque);
1433     }
1434     g_hash_table_remove(obj->properties, name);
1435 }
1436
1437 bool object_property_get(Object *obj, const char *name, Visitor *v,
1438                          Error **errp)
1439 {
1440     Error *err = NULL;
1441     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1442
1443     if (prop == NULL) {
1444         return false;
1445     }
1446
1447     if (!prop->get) {
1448         error_setg(errp, "Property '%s.%s' is not readable",
1449                    object_get_typename(obj), name);
1450         return false;
1451     }
1452     prop->get(obj, v, name, prop->opaque, &err);
1453     error_propagate(errp, err);
1454     return !err;
1455 }
1456
1457 bool object_property_set(Object *obj, const char *name, Visitor *v,
1458                          Error **errp)
1459 {
1460     ERRP_GUARD();
1461     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1462
1463     if (prop == NULL) {
1464         return false;
1465     }
1466
1467     if (!prop->set) {
1468         error_setg(errp, "Property '%s.%s' is not writable",
1469                    object_get_typename(obj), name);
1470         return false;
1471     }
1472     prop->set(obj, v, name, prop->opaque, errp);
1473     return !*errp;
1474 }
1475
1476 bool object_property_set_str(Object *obj, const char *name,
1477                              const char *value, Error **errp)
1478 {
1479     QString *qstr = qstring_from_str(value);
1480     bool ok = object_property_set_qobject(obj, name, QOBJECT(qstr), errp);
1481
1482     qobject_unref(qstr);
1483     return ok;
1484 }
1485
1486 char *object_property_get_str(Object *obj, const char *name,
1487                               Error **errp)
1488 {
1489     QObject *ret = object_property_get_qobject(obj, name, errp);
1490     QString *qstring;
1491     char *retval;
1492
1493     if (!ret) {
1494         return NULL;
1495     }
1496     qstring = qobject_to(QString, ret);
1497     if (!qstring) {
1498         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1499         retval = NULL;
1500     } else {
1501         retval = g_strdup(qstring_get_str(qstring));
1502     }
1503
1504     qobject_unref(ret);
1505     return retval;
1506 }
1507
1508 bool object_property_set_link(Object *obj, const char *name,
1509                               Object *value, Error **errp)
1510 {
1511     g_autofree char *path = NULL;
1512
1513     if (value) {
1514         path = object_get_canonical_path(value);
1515     }
1516     return object_property_set_str(obj, name, path ?: "", errp);
1517 }
1518
1519 Object *object_property_get_link(Object *obj, const char *name,
1520                                  Error **errp)
1521 {
1522     char *str = object_property_get_str(obj, name, errp);
1523     Object *target = NULL;
1524
1525     if (str && *str) {
1526         target = object_resolve_path(str, NULL);
1527         if (!target) {
1528             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1529                       "Device '%s' not found", str);
1530         }
1531     }
1532
1533     g_free(str);
1534     return target;
1535 }
1536
1537 bool object_property_set_bool(Object *obj, const char *name,
1538                               bool value, Error **errp)
1539 {
1540     QBool *qbool = qbool_from_bool(value);
1541     bool ok = object_property_set_qobject(obj, name, QOBJECT(qbool), errp);
1542
1543     qobject_unref(qbool);
1544     return ok;
1545 }
1546
1547 bool object_property_get_bool(Object *obj, const char *name,
1548                               Error **errp)
1549 {
1550     QObject *ret = object_property_get_qobject(obj, name, errp);
1551     QBool *qbool;
1552     bool retval;
1553
1554     if (!ret) {
1555         return false;
1556     }
1557     qbool = qobject_to(QBool, ret);
1558     if (!qbool) {
1559         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1560         retval = false;
1561     } else {
1562         retval = qbool_get_bool(qbool);
1563     }
1564
1565     qobject_unref(ret);
1566     return retval;
1567 }
1568
1569 bool object_property_set_int(Object *obj, const char *name,
1570                              int64_t value, Error **errp)
1571 {
1572     QNum *qnum = qnum_from_int(value);
1573     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1574
1575     qobject_unref(qnum);
1576     return ok;
1577 }
1578
1579 int64_t object_property_get_int(Object *obj, const char *name,
1580                                 Error **errp)
1581 {
1582     QObject *ret = object_property_get_qobject(obj, name, errp);
1583     QNum *qnum;
1584     int64_t retval;
1585
1586     if (!ret) {
1587         return -1;
1588     }
1589
1590     qnum = qobject_to(QNum, ret);
1591     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1592         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1593         retval = -1;
1594     }
1595
1596     qobject_unref(ret);
1597     return retval;
1598 }
1599
1600 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
1601 {
1602     Visitor *v = qobject_input_visitor_new(prop->defval);
1603
1604     assert(prop->set != NULL);
1605     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
1606
1607     visit_free(v);
1608 }
1609
1610 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
1611 {
1612     assert(!prop->defval);
1613     assert(!prop->init);
1614
1615     prop->defval = defval;
1616     prop->init = object_property_init_defval;
1617 }
1618
1619 void object_property_set_default_bool(ObjectProperty *prop, bool value)
1620 {
1621     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
1622 }
1623
1624 void object_property_set_default_str(ObjectProperty *prop, const char *value)
1625 {
1626     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
1627 }
1628
1629 void object_property_set_default_list(ObjectProperty *prop)
1630 {
1631     object_property_set_default(prop, QOBJECT(qlist_new()));
1632 }
1633
1634 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
1635 {
1636     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
1637 }
1638
1639 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
1640 {
1641     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
1642 }
1643
1644 bool object_property_set_uint(Object *obj, const char *name,
1645                               uint64_t value, Error **errp)
1646 {
1647     QNum *qnum = qnum_from_uint(value);
1648     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1649
1650     qobject_unref(qnum);
1651     return ok;
1652 }
1653
1654 uint64_t object_property_get_uint(Object *obj, const char *name,
1655                                   Error **errp)
1656 {
1657     QObject *ret = object_property_get_qobject(obj, name, errp);
1658     QNum *qnum;
1659     uint64_t retval;
1660
1661     if (!ret) {
1662         return 0;
1663     }
1664     qnum = qobject_to(QNum, ret);
1665     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1666         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1667         retval = 0;
1668     }
1669
1670     qobject_unref(ret);
1671     return retval;
1672 }
1673
1674 typedef struct EnumProperty {
1675     const QEnumLookup *lookup;
1676     int (*get)(Object *, Error **);
1677     void (*set)(Object *, int, Error **);
1678 } EnumProperty;
1679
1680 int object_property_get_enum(Object *obj, const char *name,
1681                              const char *typename, Error **errp)
1682 {
1683     char *str;
1684     int ret;
1685     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1686     EnumProperty *enumprop;
1687
1688     if (prop == NULL) {
1689         return -1;
1690     }
1691
1692     if (!g_str_equal(prop->type, typename)) {
1693         error_setg(errp, "Property %s on %s is not '%s' enum type",
1694                    name, object_class_get_name(
1695                        object_get_class(obj)), typename);
1696         return -1;
1697     }
1698
1699     enumprop = prop->opaque;
1700
1701     str = object_property_get_str(obj, name, errp);
1702     if (!str) {
1703         return -1;
1704     }
1705
1706     ret = qapi_enum_parse(enumprop->lookup, str, -1, errp);
1707     g_free(str);
1708
1709     return ret;
1710 }
1711
1712 bool object_property_parse(Object *obj, const char *name,
1713                            const char *string, Error **errp)
1714 {
1715     Visitor *v = string_input_visitor_new(string);
1716     bool ok = object_property_set(obj, name, v, errp);
1717
1718     visit_free(v);
1719     return ok;
1720 }
1721
1722 char *object_property_print(Object *obj, const char *name, bool human,
1723                             Error **errp)
1724 {
1725     Visitor *v;
1726     char *string = NULL;
1727
1728     v = string_output_visitor_new(human, &string);
1729     if (!object_property_get(obj, name, v, errp)) {
1730         goto out;
1731     }
1732
1733     visit_complete(v, &string);
1734
1735 out:
1736     visit_free(v);
1737     return string;
1738 }
1739
1740 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1741 {
1742     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1743     if (prop == NULL) {
1744         return NULL;
1745     }
1746
1747     return prop->type;
1748 }
1749
1750 Object *object_get_root(void)
1751 {
1752     static Object *root;
1753
1754     if (!root) {
1755         root = object_new("container");
1756     }
1757
1758     return root;
1759 }
1760
1761 Object *object_get_objects_root(void)
1762 {
1763     return container_get(object_get_root(), "/objects");
1764 }
1765
1766 Object *object_get_internal_root(void)
1767 {
1768     static Object *internal_root;
1769
1770     if (!internal_root) {
1771         internal_root = object_new("container");
1772     }
1773
1774     return internal_root;
1775 }
1776
1777 static void object_get_child_property(Object *obj, Visitor *v,
1778                                       const char *name, void *opaque,
1779                                       Error **errp)
1780 {
1781     Object *child = opaque;
1782     char *path;
1783
1784     path = object_get_canonical_path(child);
1785     visit_type_str(v, name, &path, errp);
1786     g_free(path);
1787 }
1788
1789 static Object *object_resolve_child_property(Object *parent, void *opaque,
1790                                              const char *part)
1791 {
1792     return opaque;
1793 }
1794
1795 static void object_finalize_child_property(Object *obj, const char *name,
1796                                            void *opaque)
1797 {
1798     Object *child = opaque;
1799
1800     if (child->class->unparent) {
1801         (child->class->unparent)(child);
1802     }
1803     child->parent = NULL;
1804     object_unref(child);
1805 }
1806
1807 ObjectProperty *
1808 object_property_try_add_child(Object *obj, const char *name,
1809                               Object *child, Error **errp)
1810 {
1811     g_autofree char *type = NULL;
1812     ObjectProperty *op;
1813
1814     assert(!child->parent);
1815
1816     type = g_strdup_printf("child<%s>", object_get_typename(child));
1817
1818     op = object_property_try_add(obj, name, type, object_get_child_property,
1819                                  NULL, object_finalize_child_property,
1820                                  child, errp);
1821     if (!op) {
1822         return NULL;
1823     }
1824     op->resolve = object_resolve_child_property;
1825     object_ref(child);
1826     child->parent = obj;
1827     return op;
1828 }
1829
1830 ObjectProperty *
1831 object_property_add_child(Object *obj, const char *name,
1832                           Object *child)
1833 {
1834     return object_property_try_add_child(obj, name, child, &error_abort);
1835 }
1836
1837 void object_property_allow_set_link(const Object *obj, const char *name,
1838                                     Object *val, Error **errp)
1839 {
1840     /* Allow the link to be set, always */
1841 }
1842
1843 typedef struct {
1844     union {
1845         Object **targetp;
1846         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
1847         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
1848     };
1849     void (*check)(const Object *, const char *, Object *, Error **);
1850     ObjectPropertyLinkFlags flags;
1851 } LinkProperty;
1852
1853 static Object **
1854 object_link_get_targetp(Object *obj, LinkProperty *lprop)
1855 {
1856     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
1857         return &lprop->target;
1858     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
1859         return (void *)obj + lprop->offset;
1860     } else {
1861         return lprop->targetp;
1862     }
1863 }
1864
1865 static void object_get_link_property(Object *obj, Visitor *v,
1866                                      const char *name, void *opaque,
1867                                      Error **errp)
1868 {
1869     LinkProperty *lprop = opaque;
1870     Object **targetp = object_link_get_targetp(obj, lprop);
1871     char *path;
1872
1873     if (*targetp) {
1874         path = object_get_canonical_path(*targetp);
1875         visit_type_str(v, name, &path, errp);
1876         g_free(path);
1877     } else {
1878         path = (char *)"";
1879         visit_type_str(v, name, &path, errp);
1880     }
1881 }
1882
1883 /*
1884  * object_resolve_link:
1885  *
1886  * Lookup an object and ensure its type matches the link property type.  This
1887  * is similar to object_resolve_path() except type verification against the
1888  * link property is performed.
1889  *
1890  * Returns: The matched object or NULL on path lookup failures.
1891  */
1892 static Object *object_resolve_link(Object *obj, const char *name,
1893                                    const char *path, Error **errp)
1894 {
1895     const char *type;
1896     char *target_type;
1897     bool ambiguous = false;
1898     Object *target;
1899
1900     /* Go from link<FOO> to FOO.  */
1901     type = object_property_get_type(obj, name, NULL);
1902     target_type = g_strndup(&type[5], strlen(type) - 6);
1903     target = object_resolve_path_type(path, target_type, &ambiguous);
1904
1905     if (ambiguous) {
1906         error_setg(errp, "Path '%s' does not uniquely identify an object",
1907                    path);
1908     } else if (!target) {
1909         target = object_resolve_path(path, &ambiguous);
1910         if (target || ambiguous) {
1911             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1912         } else {
1913             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1914                       "Device '%s' not found", path);
1915         }
1916         target = NULL;
1917     }
1918     g_free(target_type);
1919
1920     return target;
1921 }
1922
1923 static void object_set_link_property(Object *obj, Visitor *v,
1924                                      const char *name, void *opaque,
1925                                      Error **errp)
1926 {
1927     Error *local_err = NULL;
1928     LinkProperty *prop = opaque;
1929     Object **targetp = object_link_get_targetp(obj, prop);
1930     Object *old_target = *targetp;
1931     Object *new_target;
1932     char *path = NULL;
1933
1934     if (!visit_type_str(v, name, &path, errp)) {
1935         return;
1936     }
1937
1938     if (*path) {
1939         new_target = object_resolve_link(obj, name, path, errp);
1940         if (!new_target) {
1941             g_free(path);
1942             return;
1943         }
1944     } else {
1945         new_target = NULL;
1946     }
1947
1948     g_free(path);
1949
1950     prop->check(obj, name, new_target, &local_err);
1951     if (local_err) {
1952         error_propagate(errp, local_err);
1953         return;
1954     }
1955
1956     *targetp = new_target;
1957     if (prop->flags & OBJ_PROP_LINK_STRONG) {
1958         object_ref(new_target);
1959         object_unref(old_target);
1960     }
1961 }
1962
1963 static Object *object_resolve_link_property(Object *parent, void *opaque,
1964                                             const char *part)
1965 {
1966     LinkProperty *lprop = opaque;
1967
1968     return *object_link_get_targetp(parent, lprop);
1969 }
1970
1971 static void object_release_link_property(Object *obj, const char *name,
1972                                          void *opaque)
1973 {
1974     LinkProperty *prop = opaque;
1975     Object **targetp = object_link_get_targetp(obj, prop);
1976
1977     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
1978         object_unref(*targetp);
1979     }
1980     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
1981         g_free(prop);
1982     }
1983 }
1984
1985 static ObjectProperty *
1986 object_add_link_prop(Object *obj, const char *name,
1987                      const char *type, void *ptr,
1988                      void (*check)(const Object *, const char *,
1989                                    Object *, Error **),
1990                      ObjectPropertyLinkFlags flags)
1991 {
1992     LinkProperty *prop = g_malloc(sizeof(*prop));
1993     g_autofree char *full_type = NULL;
1994     ObjectProperty *op;
1995
1996     if (flags & OBJ_PROP_LINK_DIRECT) {
1997         prop->target = ptr;
1998     } else {
1999         prop->targetp = ptr;
2000     }
2001     prop->check = check;
2002     prop->flags = flags;
2003
2004     full_type = g_strdup_printf("link<%s>", type);
2005
2006     op = object_property_add(obj, name, full_type,
2007                              object_get_link_property,
2008                              check ? object_set_link_property : NULL,
2009                              object_release_link_property,
2010                              prop);
2011     op->resolve = object_resolve_link_property;
2012     return op;
2013 }
2014
2015 ObjectProperty *
2016 object_property_add_link(Object *obj, const char *name,
2017                          const char *type, Object **targetp,
2018                          void (*check)(const Object *, const char *,
2019                                        Object *, Error **),
2020                          ObjectPropertyLinkFlags flags)
2021 {
2022     return object_add_link_prop(obj, name, type, targetp, check, flags);
2023 }
2024
2025 ObjectProperty *
2026 object_class_property_add_link(ObjectClass *oc,
2027     const char *name,
2028     const char *type, ptrdiff_t offset,
2029     void (*check)(const Object *obj, const char *name,
2030                   Object *val, Error **errp),
2031     ObjectPropertyLinkFlags flags)
2032 {
2033     LinkProperty *prop = g_new0(LinkProperty, 1);
2034     char *full_type;
2035     ObjectProperty *op;
2036
2037     prop->offset = offset;
2038     prop->check = check;
2039     prop->flags = flags | OBJ_PROP_LINK_CLASS;
2040
2041     full_type = g_strdup_printf("link<%s>", type);
2042
2043     op = object_class_property_add(oc, name, full_type,
2044                                    object_get_link_property,
2045                                    check ? object_set_link_property : NULL,
2046                                    object_release_link_property,
2047                                    prop);
2048
2049     op->resolve = object_resolve_link_property;
2050
2051     g_free(full_type);
2052     return op;
2053 }
2054
2055 ObjectProperty *
2056 object_property_add_const_link(Object *obj, const char *name,
2057                                Object *target)
2058 {
2059     return object_add_link_prop(obj, name,
2060                                 object_get_typename(target), target,
2061                                 NULL, OBJ_PROP_LINK_DIRECT);
2062 }
2063
2064 const char *object_get_canonical_path_component(const Object *obj)
2065 {
2066     ObjectProperty *prop = NULL;
2067     GHashTableIter iter;
2068
2069     if (obj->parent == NULL) {
2070         return NULL;
2071     }
2072
2073     g_hash_table_iter_init(&iter, obj->parent->properties);
2074     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2075         if (!object_property_is_child(prop)) {
2076             continue;
2077         }
2078
2079         if (prop->opaque == obj) {
2080             return prop->name;
2081         }
2082     }
2083
2084     /* obj had a parent but was not a child, should never happen */
2085     g_assert_not_reached();
2086     return NULL;
2087 }
2088
2089 char *object_get_canonical_path(const Object *obj)
2090 {
2091     Object *root = object_get_root();
2092     char *newpath, *path = NULL;
2093
2094     if (obj == root) {
2095         return g_strdup("/");
2096     }
2097
2098     do {
2099         const char *component = object_get_canonical_path_component(obj);
2100
2101         if (!component) {
2102             /* A canonical path must be complete, so discard what was
2103              * collected so far.
2104              */
2105             g_free(path);
2106             return NULL;
2107         }
2108
2109         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
2110         g_free(path);
2111         path = newpath;
2112         obj = obj->parent;
2113     } while (obj != root);
2114
2115     return path;
2116 }
2117
2118 Object *object_resolve_path_component(Object *parent, const char *part)
2119 {
2120     ObjectProperty *prop = object_property_find(parent, part);
2121     if (prop == NULL) {
2122         return NULL;
2123     }
2124
2125     if (prop->resolve) {
2126         return prop->resolve(parent, prop->opaque, part);
2127     } else {
2128         return NULL;
2129     }
2130 }
2131
2132 static Object *object_resolve_abs_path(Object *parent,
2133                                           char **parts,
2134                                           const char *typename)
2135 {
2136     Object *child;
2137
2138     if (*parts == NULL) {
2139         return object_dynamic_cast(parent, typename);
2140     }
2141
2142     if (strcmp(*parts, "") == 0) {
2143         return object_resolve_abs_path(parent, parts + 1, typename);
2144     }
2145
2146     child = object_resolve_path_component(parent, *parts);
2147     if (!child) {
2148         return NULL;
2149     }
2150
2151     return object_resolve_abs_path(child, parts + 1, typename);
2152 }
2153
2154 static Object *object_resolve_partial_path(Object *parent,
2155                                            char **parts,
2156                                            const char *typename,
2157                                            bool *ambiguous)
2158 {
2159     Object *obj;
2160     GHashTableIter iter;
2161     ObjectProperty *prop;
2162
2163     obj = object_resolve_abs_path(parent, parts, typename);
2164
2165     g_hash_table_iter_init(&iter, parent->properties);
2166     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2167         Object *found;
2168
2169         if (!object_property_is_child(prop)) {
2170             continue;
2171         }
2172
2173         found = object_resolve_partial_path(prop->opaque, parts,
2174                                             typename, ambiguous);
2175         if (found) {
2176             if (obj) {
2177                 *ambiguous = true;
2178                 return NULL;
2179             }
2180             obj = found;
2181         }
2182
2183         if (*ambiguous) {
2184             return NULL;
2185         }
2186     }
2187
2188     return obj;
2189 }
2190
2191 Object *object_resolve_path_type(const char *path, const char *typename,
2192                                  bool *ambiguousp)
2193 {
2194     Object *obj;
2195     char **parts;
2196
2197     parts = g_strsplit(path, "/", 0);
2198     assert(parts);
2199
2200     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
2201         bool ambiguous = false;
2202         obj = object_resolve_partial_path(object_get_root(), parts,
2203                                           typename, &ambiguous);
2204         if (ambiguousp) {
2205             *ambiguousp = ambiguous;
2206         }
2207     } else {
2208         obj = object_resolve_abs_path(object_get_root(), parts + 1, typename);
2209     }
2210
2211     g_strfreev(parts);
2212
2213     return obj;
2214 }
2215
2216 Object *object_resolve_path(const char *path, bool *ambiguous)
2217 {
2218     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
2219 }
2220
2221 Object *object_resolve_path_at(Object *parent, const char *path)
2222 {
2223     g_auto(GStrv) parts = g_strsplit(path, "/", 0);
2224
2225     if (*path == '/') {
2226         return object_resolve_abs_path(object_get_root(), parts + 1,
2227                                        TYPE_OBJECT);
2228     }
2229     return object_resolve_abs_path(parent, parts, TYPE_OBJECT);
2230 }
2231
2232 typedef struct StringProperty
2233 {
2234     char *(*get)(Object *, Error **);
2235     void (*set)(Object *, const char *, Error **);
2236 } StringProperty;
2237
2238 static void property_get_str(Object *obj, Visitor *v, const char *name,
2239                              void *opaque, Error **errp)
2240 {
2241     StringProperty *prop = opaque;
2242     char *value;
2243     Error *err = NULL;
2244
2245     value = prop->get(obj, &err);
2246     if (err) {
2247         error_propagate(errp, err);
2248         return;
2249     }
2250
2251     visit_type_str(v, name, &value, errp);
2252     g_free(value);
2253 }
2254
2255 static void property_set_str(Object *obj, Visitor *v, const char *name,
2256                              void *opaque, Error **errp)
2257 {
2258     StringProperty *prop = opaque;
2259     char *value;
2260
2261     if (!visit_type_str(v, name, &value, errp)) {
2262         return;
2263     }
2264
2265     prop->set(obj, value, errp);
2266     g_free(value);
2267 }
2268
2269 static void property_release_data(Object *obj, const char *name,
2270                                   void *opaque)
2271 {
2272     g_free(opaque);
2273 }
2274
2275 ObjectProperty *
2276 object_property_add_str(Object *obj, const char *name,
2277                         char *(*get)(Object *, Error **),
2278                         void (*set)(Object *, const char *, Error **))
2279 {
2280     StringProperty *prop = g_malloc0(sizeof(*prop));
2281
2282     prop->get = get;
2283     prop->set = set;
2284
2285     return object_property_add(obj, name, "string",
2286                                get ? property_get_str : NULL,
2287                                set ? property_set_str : NULL,
2288                                property_release_data,
2289                                prop);
2290 }
2291
2292 ObjectProperty *
2293 object_class_property_add_str(ObjectClass *klass, const char *name,
2294                                    char *(*get)(Object *, Error **),
2295                                    void (*set)(Object *, const char *,
2296                                                Error **))
2297 {
2298     StringProperty *prop = g_malloc0(sizeof(*prop));
2299
2300     prop->get = get;
2301     prop->set = set;
2302
2303     return object_class_property_add(klass, name, "string",
2304                                      get ? property_get_str : NULL,
2305                                      set ? property_set_str : NULL,
2306                                      NULL,
2307                                      prop);
2308 }
2309
2310 typedef struct BoolProperty
2311 {
2312     bool (*get)(Object *, Error **);
2313     void (*set)(Object *, bool, Error **);
2314 } BoolProperty;
2315
2316 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2317                               void *opaque, Error **errp)
2318 {
2319     BoolProperty *prop = opaque;
2320     bool value;
2321     Error *err = NULL;
2322
2323     value = prop->get(obj, &err);
2324     if (err) {
2325         error_propagate(errp, err);
2326         return;
2327     }
2328
2329     visit_type_bool(v, name, &value, errp);
2330 }
2331
2332 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2333                               void *opaque, Error **errp)
2334 {
2335     BoolProperty *prop = opaque;
2336     bool value;
2337
2338     if (!visit_type_bool(v, name, &value, errp)) {
2339         return;
2340     }
2341
2342     prop->set(obj, value, errp);
2343 }
2344
2345 ObjectProperty *
2346 object_property_add_bool(Object *obj, const char *name,
2347                          bool (*get)(Object *, Error **),
2348                          void (*set)(Object *, bool, Error **))
2349 {
2350     BoolProperty *prop = g_malloc0(sizeof(*prop));
2351
2352     prop->get = get;
2353     prop->set = set;
2354
2355     return object_property_add(obj, name, "bool",
2356                                get ? property_get_bool : NULL,
2357                                set ? property_set_bool : NULL,
2358                                property_release_data,
2359                                prop);
2360 }
2361
2362 ObjectProperty *
2363 object_class_property_add_bool(ObjectClass *klass, const char *name,
2364                                     bool (*get)(Object *, Error **),
2365                                     void (*set)(Object *, bool, Error **))
2366 {
2367     BoolProperty *prop = g_malloc0(sizeof(*prop));
2368
2369     prop->get = get;
2370     prop->set = set;
2371
2372     return object_class_property_add(klass, name, "bool",
2373                                      get ? property_get_bool : NULL,
2374                                      set ? property_set_bool : NULL,
2375                                      NULL,
2376                                      prop);
2377 }
2378
2379 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2380                               void *opaque, Error **errp)
2381 {
2382     EnumProperty *prop = opaque;
2383     int value;
2384     Error *err = NULL;
2385
2386     value = prop->get(obj, &err);
2387     if (err) {
2388         error_propagate(errp, err);
2389         return;
2390     }
2391
2392     visit_type_enum(v, name, &value, prop->lookup, errp);
2393 }
2394
2395 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2396                               void *opaque, Error **errp)
2397 {
2398     EnumProperty *prop = opaque;
2399     int value;
2400
2401     if (!visit_type_enum(v, name, &value, prop->lookup, errp)) {
2402         return;
2403     }
2404     prop->set(obj, value, errp);
2405 }
2406
2407 ObjectProperty *
2408 object_property_add_enum(Object *obj, const char *name,
2409                          const char *typename,
2410                          const QEnumLookup *lookup,
2411                          int (*get)(Object *, Error **),
2412                          void (*set)(Object *, int, Error **))
2413 {
2414     EnumProperty *prop = g_malloc(sizeof(*prop));
2415
2416     prop->lookup = lookup;
2417     prop->get = get;
2418     prop->set = set;
2419
2420     return object_property_add(obj, name, typename,
2421                                get ? property_get_enum : NULL,
2422                                set ? property_set_enum : NULL,
2423                                property_release_data,
2424                                prop);
2425 }
2426
2427 ObjectProperty *
2428 object_class_property_add_enum(ObjectClass *klass, const char *name,
2429                                     const char *typename,
2430                                     const QEnumLookup *lookup,
2431                                     int (*get)(Object *, Error **),
2432                                     void (*set)(Object *, int, Error **))
2433 {
2434     EnumProperty *prop = g_malloc(sizeof(*prop));
2435
2436     prop->lookup = lookup;
2437     prop->get = get;
2438     prop->set = set;
2439
2440     return object_class_property_add(klass, name, typename,
2441                                      get ? property_get_enum : NULL,
2442                                      set ? property_set_enum : NULL,
2443                                      NULL,
2444                                      prop);
2445 }
2446
2447 typedef struct TMProperty {
2448     void (*get)(Object *, struct tm *, Error **);
2449 } TMProperty;
2450
2451 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2452                             void *opaque, Error **errp)
2453 {
2454     TMProperty *prop = opaque;
2455     Error *err = NULL;
2456     struct tm value;
2457
2458     prop->get(obj, &value, &err);
2459     if (err) {
2460         error_propagate(errp, err);
2461         return;
2462     }
2463
2464     if (!visit_start_struct(v, name, NULL, 0, errp)) {
2465         return;
2466     }
2467     if (!visit_type_int32(v, "tm_year", &value.tm_year, errp)) {
2468         goto out_end;
2469     }
2470     if (!visit_type_int32(v, "tm_mon", &value.tm_mon, errp)) {
2471         goto out_end;
2472     }
2473     if (!visit_type_int32(v, "tm_mday", &value.tm_mday, errp)) {
2474         goto out_end;
2475     }
2476     if (!visit_type_int32(v, "tm_hour", &value.tm_hour, errp)) {
2477         goto out_end;
2478     }
2479     if (!visit_type_int32(v, "tm_min", &value.tm_min, errp)) {
2480         goto out_end;
2481     }
2482     if (!visit_type_int32(v, "tm_sec", &value.tm_sec, errp)) {
2483         goto out_end;
2484     }
2485     visit_check_struct(v, errp);
2486 out_end:
2487     visit_end_struct(v, NULL);
2488 }
2489
2490 ObjectProperty *
2491 object_property_add_tm(Object *obj, const char *name,
2492                        void (*get)(Object *, struct tm *, Error **))
2493 {
2494     TMProperty *prop = g_malloc0(sizeof(*prop));
2495
2496     prop->get = get;
2497
2498     return object_property_add(obj, name, "struct tm",
2499                                get ? property_get_tm : NULL, NULL,
2500                                property_release_data,
2501                                prop);
2502 }
2503
2504 ObjectProperty *
2505 object_class_property_add_tm(ObjectClass *klass, const char *name,
2506                              void (*get)(Object *, struct tm *, Error **))
2507 {
2508     TMProperty *prop = g_malloc0(sizeof(*prop));
2509
2510     prop->get = get;
2511
2512     return object_class_property_add(klass, name, "struct tm",
2513                                      get ? property_get_tm : NULL,
2514                                      NULL, NULL, prop);
2515 }
2516
2517 static char *object_get_type(Object *obj, Error **errp)
2518 {
2519     return g_strdup(object_get_typename(obj));
2520 }
2521
2522 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2523                                    void *opaque, Error **errp)
2524 {
2525     uint8_t value = *(uint8_t *)opaque;
2526     visit_type_uint8(v, name, &value, errp);
2527 }
2528
2529 static void property_set_uint8_ptr(Object *obj, Visitor *v, const char *name,
2530                                    void *opaque, Error **errp)
2531 {
2532     uint8_t *field = opaque;
2533     uint8_t value;
2534
2535     if (!visit_type_uint8(v, name, &value, errp)) {
2536         return;
2537     }
2538
2539     *field = value;
2540 }
2541
2542 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2543                                     void *opaque, Error **errp)
2544 {
2545     uint16_t value = *(uint16_t *)opaque;
2546     visit_type_uint16(v, name, &value, errp);
2547 }
2548
2549 static void property_set_uint16_ptr(Object *obj, Visitor *v, const char *name,
2550                                     void *opaque, Error **errp)
2551 {
2552     uint16_t *field = opaque;
2553     uint16_t value;
2554
2555     if (!visit_type_uint16(v, name, &value, errp)) {
2556         return;
2557     }
2558
2559     *field = value;
2560 }
2561
2562 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2563                                     void *opaque, Error **errp)
2564 {
2565     uint32_t value = *(uint32_t *)opaque;
2566     visit_type_uint32(v, name, &value, errp);
2567 }
2568
2569 static void property_set_uint32_ptr(Object *obj, Visitor *v, const char *name,
2570                                     void *opaque, Error **errp)
2571 {
2572     uint32_t *field = opaque;
2573     uint32_t value;
2574
2575     if (!visit_type_uint32(v, name, &value, errp)) {
2576         return;
2577     }
2578
2579     *field = value;
2580 }
2581
2582 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2583                                     void *opaque, Error **errp)
2584 {
2585     uint64_t value = *(uint64_t *)opaque;
2586     visit_type_uint64(v, name, &value, errp);
2587 }
2588
2589 static void property_set_uint64_ptr(Object *obj, Visitor *v, const char *name,
2590                                     void *opaque, Error **errp)
2591 {
2592     uint64_t *field = opaque;
2593     uint64_t value;
2594
2595     if (!visit_type_uint64(v, name, &value, errp)) {
2596         return;
2597     }
2598
2599     *field = value;
2600 }
2601
2602 ObjectProperty *
2603 object_property_add_uint8_ptr(Object *obj, const char *name,
2604                               const uint8_t *v,
2605                               ObjectPropertyFlags flags)
2606 {
2607     ObjectPropertyAccessor *getter = NULL;
2608     ObjectPropertyAccessor *setter = NULL;
2609
2610     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2611         getter = property_get_uint8_ptr;
2612     }
2613
2614     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2615         setter = property_set_uint8_ptr;
2616     }
2617
2618     return object_property_add(obj, name, "uint8",
2619                                getter, setter, NULL, (void *)v);
2620 }
2621
2622 ObjectProperty *
2623 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2624                                     const uint8_t *v,
2625                                     ObjectPropertyFlags flags)
2626 {
2627     ObjectPropertyAccessor *getter = NULL;
2628     ObjectPropertyAccessor *setter = NULL;
2629
2630     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2631         getter = property_get_uint8_ptr;
2632     }
2633
2634     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2635         setter = property_set_uint8_ptr;
2636     }
2637
2638     return object_class_property_add(klass, name, "uint8",
2639                                      getter, setter, NULL, (void *)v);
2640 }
2641
2642 ObjectProperty *
2643 object_property_add_uint16_ptr(Object *obj, const char *name,
2644                                const uint16_t *v,
2645                                ObjectPropertyFlags flags)
2646 {
2647     ObjectPropertyAccessor *getter = NULL;
2648     ObjectPropertyAccessor *setter = NULL;
2649
2650     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2651         getter = property_get_uint16_ptr;
2652     }
2653
2654     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2655         setter = property_set_uint16_ptr;
2656     }
2657
2658     return object_property_add(obj, name, "uint16",
2659                                getter, setter, NULL, (void *)v);
2660 }
2661
2662 ObjectProperty *
2663 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2664                                      const uint16_t *v,
2665                                      ObjectPropertyFlags flags)
2666 {
2667     ObjectPropertyAccessor *getter = NULL;
2668     ObjectPropertyAccessor *setter = NULL;
2669
2670     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2671         getter = property_get_uint16_ptr;
2672     }
2673
2674     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2675         setter = property_set_uint16_ptr;
2676     }
2677
2678     return object_class_property_add(klass, name, "uint16",
2679                                      getter, setter, NULL, (void *)v);
2680 }
2681
2682 ObjectProperty *
2683 object_property_add_uint32_ptr(Object *obj, const char *name,
2684                                const uint32_t *v,
2685                                ObjectPropertyFlags flags)
2686 {
2687     ObjectPropertyAccessor *getter = NULL;
2688     ObjectPropertyAccessor *setter = NULL;
2689
2690     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2691         getter = property_get_uint32_ptr;
2692     }
2693
2694     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2695         setter = property_set_uint32_ptr;
2696     }
2697
2698     return object_property_add(obj, name, "uint32",
2699                                getter, setter, NULL, (void *)v);
2700 }
2701
2702 ObjectProperty *
2703 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2704                                      const uint32_t *v,
2705                                      ObjectPropertyFlags flags)
2706 {
2707     ObjectPropertyAccessor *getter = NULL;
2708     ObjectPropertyAccessor *setter = NULL;
2709
2710     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2711         getter = property_get_uint32_ptr;
2712     }
2713
2714     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2715         setter = property_set_uint32_ptr;
2716     }
2717
2718     return object_class_property_add(klass, name, "uint32",
2719                                      getter, setter, NULL, (void *)v);
2720 }
2721
2722 ObjectProperty *
2723 object_property_add_uint64_ptr(Object *obj, const char *name,
2724                                const uint64_t *v,
2725                                ObjectPropertyFlags flags)
2726 {
2727     ObjectPropertyAccessor *getter = NULL;
2728     ObjectPropertyAccessor *setter = NULL;
2729
2730     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2731         getter = property_get_uint64_ptr;
2732     }
2733
2734     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2735         setter = property_set_uint64_ptr;
2736     }
2737
2738     return object_property_add(obj, name, "uint64",
2739                                getter, setter, NULL, (void *)v);
2740 }
2741
2742 ObjectProperty *
2743 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2744                                      const uint64_t *v,
2745                                      ObjectPropertyFlags flags)
2746 {
2747     ObjectPropertyAccessor *getter = NULL;
2748     ObjectPropertyAccessor *setter = NULL;
2749
2750     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2751         getter = property_get_uint64_ptr;
2752     }
2753
2754     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2755         setter = property_set_uint64_ptr;
2756     }
2757
2758     return object_class_property_add(klass, name, "uint64",
2759                                      getter, setter, NULL, (void *)v);
2760 }
2761
2762 typedef struct {
2763     Object *target_obj;
2764     char *target_name;
2765 } AliasProperty;
2766
2767 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2768                                void *opaque, Error **errp)
2769 {
2770     AliasProperty *prop = opaque;
2771     Visitor *alias_v = visitor_forward_field(v, prop->target_name, name);
2772
2773     object_property_get(prop->target_obj, prop->target_name, alias_v, errp);
2774     visit_free(alias_v);
2775 }
2776
2777 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2778                                void *opaque, Error **errp)
2779 {
2780     AliasProperty *prop = opaque;
2781     Visitor *alias_v = visitor_forward_field(v, prop->target_name, name);
2782
2783     object_property_set(prop->target_obj, prop->target_name, alias_v, errp);
2784     visit_free(alias_v);
2785 }
2786
2787 static Object *property_resolve_alias(Object *obj, void *opaque,
2788                                       const char *part)
2789 {
2790     AliasProperty *prop = opaque;
2791
2792     return object_resolve_path_component(prop->target_obj, prop->target_name);
2793 }
2794
2795 static void property_release_alias(Object *obj, const char *name, void *opaque)
2796 {
2797     AliasProperty *prop = opaque;
2798
2799     g_free(prop->target_name);
2800     g_free(prop);
2801 }
2802
2803 ObjectProperty *
2804 object_property_add_alias(Object *obj, const char *name,
2805                           Object *target_obj, const char *target_name)
2806 {
2807     AliasProperty *prop;
2808     ObjectProperty *op;
2809     ObjectProperty *target_prop;
2810     g_autofree char *prop_type = NULL;
2811
2812     target_prop = object_property_find_err(target_obj, target_name,
2813                                            &error_abort);
2814
2815     if (object_property_is_child(target_prop)) {
2816         prop_type = g_strdup_printf("link%s",
2817                                     target_prop->type + strlen("child"));
2818     } else {
2819         prop_type = g_strdup(target_prop->type);
2820     }
2821
2822     prop = g_malloc(sizeof(*prop));
2823     prop->target_obj = target_obj;
2824     prop->target_name = g_strdup(target_name);
2825
2826     op = object_property_add(obj, name, prop_type,
2827                              property_get_alias,
2828                              property_set_alias,
2829                              property_release_alias,
2830                              prop);
2831     op->resolve = property_resolve_alias;
2832     if (target_prop->defval) {
2833         op->defval = qobject_ref(target_prop->defval);
2834     }
2835
2836     object_property_set_description(obj, op->name,
2837                                     target_prop->description);
2838     return op;
2839 }
2840
2841 void object_property_set_description(Object *obj, const char *name,
2842                                      const char *description)
2843 {
2844     ObjectProperty *op;
2845
2846     op = object_property_find_err(obj, name, &error_abort);
2847     g_free(op->description);
2848     op->description = g_strdup(description);
2849 }
2850
2851 void object_class_property_set_description(ObjectClass *klass,
2852                                            const char *name,
2853                                            const char *description)
2854 {
2855     ObjectProperty *op;
2856
2857     op = g_hash_table_lookup(klass->properties, name);
2858     g_free(op->description);
2859     op->description = g_strdup(description);
2860 }
2861
2862 static void object_class_init(ObjectClass *klass, void *data)
2863 {
2864     object_class_property_add_str(klass, "type", object_get_type,
2865                                   NULL);
2866 }
2867
2868 static void register_types(void)
2869 {
2870     static const TypeInfo interface_info = {
2871         .name = TYPE_INTERFACE,
2872         .class_size = sizeof(InterfaceClass),
2873         .abstract = true,
2874     };
2875
2876     static const TypeInfo object_info = {
2877         .name = TYPE_OBJECT,
2878         .instance_size = sizeof(Object),
2879         .class_init = object_class_init,
2880         .abstract = true,
2881     };
2882
2883     type_interface = type_register_internal(&interface_info);
2884     type_register_internal(&object_info);
2885 }
2886
2887 type_init(register_types)