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 "qapi/error.h"
  15 #include "qom/object.h"
  16 #include "qom/object_interfaces.h"
  17 #include "qemu/cutils.h"
  18 #include "qapi/visitor.h"
  19 #include "qapi-visit.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qmp/qerror.h"
  23 #include "trace.h"
  24
  25 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  26  * of the QOM core on QObject?  */
  27 #include "qom/qom-qobject.h"
  28 #include "qapi/qmp/qobject.h"
  29 #include "qapi/qmp/qbool.h"
  30 #include "qapi/qmp/qint.h"
  31 #include "qapi/qmp/qstring.h"
  32
  33 #define MAX_INTERFACES 32
  34
  35 typedef struct InterfaceImpl InterfaceImpl;
  36 typedef struct TypeImpl TypeImpl;
  37
  38 struct InterfaceImpl
  39 {
  40     const char *typename;
  41 };
  42
  43 struct TypeImpl
  44 {
  45     const char *name;
  46
  47     size_t class_size;
  48
  49     size_t instance_size;
  50
  51     void (*class_init)(ObjectClass *klass, void *data);
  52     void (*class_base_init)(ObjectClass *klass, void *data);
  53     void (*class_finalize)(ObjectClass *klass, void *data);
  54
  55     void *class_data;
  56
  57     void (*instance_init)(Object *obj);
  58     void (*instance_post_init)(Object *obj);
  59     void (*instance_finalize)(Object *obj);
  60
  61     bool abstract;
  62
  63     const char *parent;
  64     TypeImpl *parent_type;
  65
  66     ObjectClass *class;
  67
  68     int num_interfaces;
  69     InterfaceImpl interfaces[MAX_INTERFACES];
  70 };
  71
  72 static Type type_interface;
  73
  74 static GHashTable *type_table_get(void)
  75 {
  76     static GHashTable *type_table;
  77
  78     if (type_table == NULL) {
  79         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  80     }
  81
  82     return type_table;
  83 }
  84
  85 static bool enumerating_types;
  86
  87 static void type_table_add(TypeImpl *ti)
  88 {
  89     assert(!enumerating_types);
  90     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  91 }
  92
  93 static TypeImpl *type_table_lookup(const char *name)
  94 {
  95     return g_hash_table_lookup(type_table_get(), name);
  96 }
  97
  98 static TypeImpl *type_new(const TypeInfo *info)
  99 {
 100     TypeImpl *ti = g_malloc0(sizeof(*ti));
 101     int i;
 102
 103     g_assert(info->name != NULL);
 104
 105     if (type_table_lookup(info->name) != NULL) {
 106         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 107         abort();
 108     }
 109
 110     ti->name = g_strdup(info->name);
 111     ti->parent = g_strdup(info->parent);
 112
 113     ti->class_size = info->class_size;
 114     ti->instance_size = info->instance_size;
 115
 116     ti->class_init = info->class_init;
 117     ti->class_base_init = info->class_base_init;
 118     ti->class_finalize = info->class_finalize;
 119     ti->class_data = info->class_data;
 120
 121     ti->instance_init = info->instance_init;
 122     ti->instance_post_init = info->instance_post_init;
 123     ti->instance_finalize = info->instance_finalize;
 124
 125     ti->abstract = info->abstract;
 126
 127     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 128         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 129     }
 130     ti->num_interfaces = i;
 131
 132     return ti;
 133 }
 134
 135 static TypeImpl *type_register_internal(const TypeInfo *info)
 136 {
 137     TypeImpl *ti;
 138     ti = type_new(info);
 139
 140     type_table_add(ti);
 141     return ti;
 142 }
 143
 144 TypeImpl *type_register(const TypeInfo *info)
 145 {
 146     assert(info->parent);
 147     return type_register_internal(info);
 148 }
 149
 150 TypeImpl *type_register_static(const TypeInfo *info)
 151 {
 152     return type_register(info);
 153 }
 154
 155 static TypeImpl *type_get_by_name(const char *name)
 156 {
 157     if (name == NULL) {
 158         return NULL;
 159     }
 160
 161     return type_table_lookup(name);
 162 }
 163
 164 static TypeImpl *type_get_parent(TypeImpl *type)
 165 {
 166     if (!type->parent_type && type->parent) {
 167         type->parent_type = type_get_by_name(type->parent);
 168         g_assert(type->parent_type != NULL);
 169     }
 170
 171     return type->parent_type;
 172 }
 173
 174 static bool type_has_parent(TypeImpl *type)
 175 {
 176     return (type->parent != NULL);
 177 }
 178
 179 static size_t type_class_get_size(TypeImpl *ti)
 180 {
 181     if (ti->class_size) {
 182         return ti->class_size;
 183     }
 184
 185     if (type_has_parent(ti)) {
 186         return type_class_get_size(type_get_parent(ti));
 187     }
 188
 189     return sizeof(ObjectClass);
 190 }
 191
 192 static size_t type_object_get_size(TypeImpl *ti)
 193 {
 194     if (ti->instance_size) {
 195         return ti->instance_size;
 196     }
 197
 198     if (type_has_parent(ti)) {
 199         return type_object_get_size(type_get_parent(ti));
 200     }
 201
 202     return 0;
 203 }
 204
 205 size_t object_type_get_instance_size(const char *typename)
 206 {
 207     TypeImpl *type = type_get_by_name(typename);
 208
 209     g_assert(type != NULL);
 210     return type_object_get_size(type);
 211 }
 212
 213 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 214 {
 215     assert(target_type);
 216
 217     /* Check if target_type is a direct ancestor of type */
 218     while (type) {
 219         if (type == target_type) {
 220             return true;
 221         }
 222
 223         type = type_get_parent(type);
 224     }
 225
 226     return false;
 227 }
 228
 229 static void type_initialize(TypeImpl *ti);
 230
 231 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 232                                       TypeImpl *parent_type)
 233 {
 234     InterfaceClass *new_iface;
 235     TypeInfo info = { };
 236     TypeImpl *iface_impl;
 237
 238     info.parent = parent_type->name;
 239     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 240     info.abstract = true;
 241
 242     iface_impl = type_new(&info);
 243     iface_impl->parent_type = parent_type;
 244     type_initialize(iface_impl);
 245     g_free((char *)info.name);
 246
 247     new_iface = (InterfaceClass *)iface_impl->class;
 248     new_iface->concrete_class = ti->class;
 249     new_iface->interface_type = interface_type;
 250
 251     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 252                                            iface_impl->class);
 253 }
 254
 255 static void object_property_free(gpointer data)
 256 {
 257     ObjectProperty *prop = data;
 258
 259     g_free(prop->name);
 260     g_free(prop->type);
 261     g_free(prop->description);
 262     g_free(prop);
 263 }
 264
 265 static void type_initialize(TypeImpl *ti)
 266 {
 267     TypeImpl *parent;
 268
 269     if (ti->class) {
 270         return;
 271     }
 272
 273     ti->class_size = type_class_get_size(ti);
 274     ti->instance_size = type_object_get_size(ti);
 275
 276     ti->class = g_malloc0(ti->class_size);
 277
 278     parent = type_get_parent(ti);
 279     if (parent) {
 280         type_initialize(parent);
 281         GSList *e;
 282         int i;
 283
 284         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 285         memcpy(ti->class, parent->class, parent->class_size);
 286         ti->class->interfaces = NULL;
 287         ti->class->properties = g_hash_table_new_full(
 288             g_str_hash, g_str_equal, g_free, object_property_free);
 289
 290         for (e = parent->class->interfaces; e; e = e->next) {
 291             InterfaceClass *iface = e->data;
 292             ObjectClass *klass = OBJECT_CLASS(iface);
 293
 294             type_initialize_interface(ti, iface->interface_type, klass->type);
 295         }
 296
 297         for (i = 0; i < ti->num_interfaces; i++) {
 298             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 299             for (e = ti->class->interfaces; e; e = e->next) {
 300                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 301
 302                 if (type_is_ancestor(target_type, t)) {
 303                     break;
 304                 }
 305             }
 306
 307             if (e) {
 308                 continue;
 309             }
 310
 311             type_initialize_interface(ti, t, t);
 312         }
 313     } else {
 314         ti->class->properties = g_hash_table_new_full(
 315             g_str_hash, g_str_equal, g_free, object_property_free);
 316     }
 317
 318     ti->class->type = ti;
 319
 320     while (parent) {
 321         if (parent->class_base_init) {
 322             parent->class_base_init(ti->class, ti->class_data);
 323         }
 324         parent = type_get_parent(parent);
 325     }
 326
 327     if (ti->class_init) {
 328         ti->class_init(ti->class, ti->class_data);
 329     }
 330 }
 331
 332 static void object_init_with_type(Object *obj, TypeImpl *ti)
 333 {
 334     if (type_has_parent(ti)) {
 335         object_init_with_type(obj, type_get_parent(ti));
 336     }
 337
 338     if (ti->instance_init) {
 339         ti->instance_init(obj);
 340     }
 341 }
 342
 343 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 344 {
 345     if (ti->instance_post_init) {
 346         ti->instance_post_init(obj);
 347     }
 348
 349     if (type_has_parent(ti)) {
 350         object_post_init_with_type(obj, type_get_parent(ti));
 351     }
 352 }
 353
 354 void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 355 {
 356     Object *obj = data;
 357
 358     g_assert(type != NULL);
 359     type_initialize(type);
 360
 361     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 362     g_assert(type->abstract == false);
 363     g_assert_cmpint(size, >=, type->instance_size);
 364
 365     memset(obj, 0, type->instance_size);
 366     obj->class = type->class;
 367     object_ref(obj);
 368     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 369                                             NULL, object_property_free);
 370     object_init_with_type(obj, type);
 371     object_post_init_with_type(obj, type);
 372 }
 373
 374 void object_initialize(void *data, size_t size, const char *typename)
 375 {
 376     TypeImpl *type = type_get_by_name(typename);
 377
 378     object_initialize_with_type(data, size, type);
 379 }
 380
 381 static inline bool object_property_is_child(ObjectProperty *prop)
 382 {
 383     return strstart(prop->type, "child<", NULL);
 384 }
 385
 386 static void object_property_del_all(Object *obj)
 387 {
 388     ObjectProperty *prop;
 389     GHashTableIter iter;
 390     gpointer key, value;
 391     bool released;
 392
 393     do {
 394         released = false;
 395         g_hash_table_iter_init(&iter, obj->properties);
 396         while (g_hash_table_iter_next(&iter, &key, &value)) {
 397             prop = value;
 398             if (prop->release) {
 399                 prop->release(obj, prop->name, prop->opaque);
 400                 prop->release = NULL;
 401                 released = true;
 402                 break;
 403             }
 404             g_hash_table_iter_remove(&iter);
 405         }
 406     } while (released);
 407
 408     g_hash_table_unref(obj->properties);
 409 }
 410
 411 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 412 {
 413     ObjectProperty *prop;
 414     GHashTableIter iter;
 415     gpointer key, value;
 416
 417     g_hash_table_iter_init(&iter, obj->properties);
 418     while (g_hash_table_iter_next(&iter, &key, &value)) {
 419         prop = value;
 420         if (object_property_is_child(prop) && prop->opaque == child) {
 421             if (prop->release) {
 422                 prop->release(obj, prop->name, prop->opaque);
 423                 prop->release = NULL;
 424             }
 425             break;
 426         }
 427     }
 428     g_hash_table_iter_init(&iter, obj->properties);
 429     while (g_hash_table_iter_next(&iter, &key, &value)) {
 430         prop = value;
 431         if (object_property_is_child(prop) && prop->opaque == child) {
 432             g_hash_table_iter_remove(&iter);
 433             break;
 434         }
 435     }
 436 }
 437
 438 void object_unparent(Object *obj)
 439 {
 440     if (obj->parent) {
 441         object_property_del_child(obj->parent, obj, NULL);
 442     }
 443 }
 444
 445 static void object_deinit(Object *obj, TypeImpl *type)
 446 {
 447     if (type->instance_finalize) {
 448         type->instance_finalize(obj);
 449     }
 450
 451     if (type_has_parent(type)) {
 452         object_deinit(obj, type_get_parent(type));
 453     }
 454 }
 455
 456 static void object_finalize(void *data)
 457 {
 458     Object *obj = data;
 459     TypeImpl *ti = obj->class->type;
 460
 461     object_property_del_all(obj);
 462     object_deinit(obj, ti);
 463
 464     g_assert_cmpint(obj->ref, ==, 0);
 465     if (obj->free) {
 466         obj->free(obj);
 467     }
 468 }
 469
 470 Object *object_new_with_type(Type type)
 471 {
 472     Object *obj;
 473
 474     g_assert(type != NULL);
 475     type_initialize(type);
 476
 477     obj = g_malloc(type->instance_size);
 478     object_initialize_with_type(obj, type->instance_size, type);
 479     obj->free = g_free;
 480
 481     return obj;
 482 }
 483
 484 Object *object_new(const char *typename)
 485 {
 486     TypeImpl *ti = type_get_by_name(typename);
 487
 488     return object_new_with_type(ti);
 489 }
 490
 491
 492 Object *object_new_with_props(const char *typename,
 493                               Object *parent,
 494                               const char *id,
 495                               Error **errp,
 496                               ...)
 497 {
 498     va_list vargs;
 499     Object *obj;
 500
 501     va_start(vargs, errp);
 502     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 503     va_end(vargs);
 504
 505     return obj;
 506 }
 507
 508
 509 Object *object_new_with_propv(const char *typename,
 510                               Object *parent,
 511                               const char *id,
 512                               Error **errp,
 513                               va_list vargs)
 514 {
 515     Object *obj;
 516     ObjectClass *klass;
 517     Error *local_err = NULL;
 518
 519     klass = object_class_by_name(typename);
 520     if (!klass) {
 521         error_setg(errp, "invalid object type: %s", typename);
 522         return NULL;
 523     }
 524
 525     if (object_class_is_abstract(klass)) {
 526         error_setg(errp, "object type '%s' is abstract", typename);
 527         return NULL;
 528     }
 529     obj = object_new(typename);
 530
 531     if (object_set_propv(obj, &local_err, vargs) < 0) {
 532         goto error;
 533     }
 534
 535     object_property_add_child(parent, id, obj, &local_err);
 536     if (local_err) {
 537         goto error;
 538     }
 539
 540     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 541         user_creatable_complete(obj, &local_err);
 542         if (local_err) {
 543             object_unparent(obj);
 544             goto error;
 545         }
 546     }
 547
 548     object_unref(OBJECT(obj));
 549     return obj;
 550
 551  error:
 552     error_propagate(errp, local_err);
 553     object_unref(obj);
 554     return NULL;
 555 }
 556
 557
 558 int object_set_props(Object *obj,
 559                      Error **errp,
 560                      ...)
 561 {
 562     va_list vargs;
 563     int ret;
 564
 565     va_start(vargs, errp);
 566     ret = object_set_propv(obj, errp, vargs);
 567     va_end(vargs);
 568
 569     return ret;
 570 }
 571
 572
 573 int object_set_propv(Object *obj,
 574                      Error **errp,
 575                      va_list vargs)
 576 {
 577     const char *propname;
 578     Error *local_err = NULL;
 579
 580     propname = va_arg(vargs, char *);
 581     while (propname != NULL) {
 582         const char *value = va_arg(vargs, char *);
 583
 584         g_assert(value != NULL);
 585         object_property_parse(obj, value, propname, &local_err);
 586         if (local_err) {
 587             error_propagate(errp, local_err);
 588             return -1;
 589         }
 590         propname = va_arg(vargs, char *);
 591     }
 592
 593     return 0;
 594 }
 595
 596
 597 Object *object_dynamic_cast(Object *obj, const char *typename)
 598 {
 599     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 600         return obj;
 601     }
 602
 603     return NULL;
 604 }
 605
 606 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 607                                    const char *file, int line, const char *func)
 608 {
 609     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 610                                      typename, file, line, func);
 611
 612 #ifdef CONFIG_QOM_CAST_DEBUG
 613     int i;
 614     Object *inst;
 615
 616     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 617         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 618             goto out;
 619         }
 620     }
 621
 622     inst = object_dynamic_cast(obj, typename);
 623
 624     if (!inst && obj) {
 625         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 626                 file, line, func, obj, typename);
 627         abort();
 628     }
 629
 630     assert(obj == inst);
 631
 632     if (obj && obj == inst) {
 633         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 634             atomic_set(&obj->class->object_cast_cache[i - 1],
 635                        atomic_read(&obj->class->object_cast_cache[i]));
 636         }
 637         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 638     }
 639
 640 out:
 641 #endif
 642     return obj;
 643 }
 644
 645 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 646                                        const char *typename)
 647 {
 648     ObjectClass *ret = NULL;
 649     TypeImpl *target_type;
 650     TypeImpl *type;
 651
 652     if (!class) {
 653         return NULL;
 654     }
 655
 656     /* A simple fast path that can trigger a lot for leaf classes.  */
 657     type = class->type;
 658     if (type->name == typename) {
 659         return class;
 660     }
 661
 662     target_type = type_get_by_name(typename);
 663     if (!target_type) {
 664         /* target class type unknown, so fail the cast */
 665         return NULL;
 666     }
 667
 668     if (type->class->interfaces &&
 669             type_is_ancestor(target_type, type_interface)) {
 670         int found = 0;
 671         GSList *i;
 672
 673         for (i = class->interfaces; i; i = i->next) {
 674             ObjectClass *target_class = i->data;
 675
 676             if (type_is_ancestor(target_class->type, target_type)) {
 677                 ret = target_class;
 678                 found++;
 679             }
 680          }
 681
 682         /* The match was ambiguous, don't allow a cast */
 683         if (found > 1) {
 684             ret = NULL;
 685         }
 686     } else if (type_is_ancestor(type, target_type)) {
 687         ret = class;
 688     }
 689
 690     return ret;
 691 }
 692
 693 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 694                                               const char *typename,
 695                                               const char *file, int line,
 696                                               const char *func)
 697 {
 698     ObjectClass *ret;
 699
 700     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 701                                            typename, file, line, func);
 702
 703 #ifdef CONFIG_QOM_CAST_DEBUG
 704     int i;
 705
 706     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 707         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 708             ret = class;
 709             goto out;
 710         }
 711     }
 712 #else
 713     if (!class || !class->interfaces) {
 714         return class;
 715     }
 716 #endif
 717
 718     ret = object_class_dynamic_cast(class, typename);
 719     if (!ret && class) {
 720         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 721                 file, line, func, class, typename);
 722         abort();
 723     }
 724
 725 #ifdef CONFIG_QOM_CAST_DEBUG
 726     if (class && ret == class) {
 727         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 728             atomic_set(&class->class_cast_cache[i - 1],
 729                        atomic_read(&class->class_cast_cache[i]));
 730         }
 731         atomic_set(&class->class_cast_cache[i - 1], typename);
 732     }
 733 out:
 734 #endif
 735     return ret;
 736 }
 737
 738 const char *object_get_typename(Object *obj)
 739 {
 740     return obj->class->type->name;
 741 }
 742
 743 ObjectClass *object_get_class(Object *obj)
 744 {
 745     return obj->class;
 746 }
 747
 748 bool object_class_is_abstract(ObjectClass *klass)
 749 {
 750     return klass->type->abstract;
 751 }
 752
 753 const char *object_class_get_name(ObjectClass *klass)
 754 {
 755     return klass->type->name;
 756 }
 757
 758 ObjectClass *object_class_by_name(const char *typename)
 759 {
 760     TypeImpl *type = type_get_by_name(typename);
 761
 762     if (!type) {
 763         return NULL;
 764     }
 765
 766     type_initialize(type);
 767
 768     return type->class;
 769 }
 770
 771 ObjectClass *object_class_get_parent(ObjectClass *class)
 772 {
 773     TypeImpl *type = type_get_parent(class->type);
 774
 775     if (!type) {
 776         return NULL;
 777     }
 778
 779     type_initialize(type);
 780
 781     return type->class;
 782 }
 783
 784 typedef struct OCFData
 785 {
 786     void (*fn)(ObjectClass *klass, void *opaque);
 787     const char *implements_type;
 788     bool include_abstract;
 789     void *opaque;
 790 } OCFData;
 791
 792 static void object_class_foreach_tramp(gpointer key, gpointer value,
 793                                        gpointer opaque)
 794 {
 795     OCFData *data = opaque;
 796     TypeImpl *type = value;
 797     ObjectClass *k;
 798
 799     type_initialize(type);
 800     k = type->class;
 801
 802     if (!data->include_abstract && type->abstract) {
 803         return;
 804     }
 805
 806     if (data->implements_type &&
 807         !object_class_dynamic_cast(k, data->implements_type)) {
 808         return;
 809     }
 810
 811     data->fn(k, data->opaque);
 812 }
 813
 814 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 815                           const char *implements_type, bool include_abstract,
 816                           void *opaque)
 817 {
 818     OCFData data = { fn, implements_type, include_abstract, opaque };
 819
 820     enumerating_types = true;
 821     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 822     enumerating_types = false;
 823 }
 824
 825 static int do_object_child_foreach(Object *obj,
 826                                    int (*fn)(Object *child, void *opaque),
 827                                    void *opaque, bool recurse)
 828 {
 829     GHashTableIter iter;
 830     ObjectProperty *prop;
 831     int ret = 0;
 832
 833     g_hash_table_iter_init(&iter, obj->properties);
 834     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 835         if (object_property_is_child(prop)) {
 836             Object *child = prop->opaque;
 837
 838             ret = fn(child, opaque);
 839             if (ret != 0) {
 840                 break;
 841             }
 842             if (recurse) {
 843                 do_object_child_foreach(child, fn, opaque, true);
 844             }
 845         }
 846     }
 847     return ret;
 848 }
 849
 850 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 851                          void *opaque)
 852 {
 853     return do_object_child_foreach(obj, fn, opaque, false);
 854 }
 855
 856 int object_child_foreach_recursive(Object *obj,
 857                                    int (*fn)(Object *child, void *opaque),
 858                                    void *opaque)
 859 {
 860     return do_object_child_foreach(obj, fn, opaque, true);
 861 }
 862
 863 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 864 {
 865     GSList **list = opaque;
 866
 867     *list = g_slist_prepend(*list, klass);
 868 }
 869
 870 GSList *object_class_get_list(const char *implements_type,
 871                               bool include_abstract)
 872 {
 873     GSList *list = NULL;
 874
 875     object_class_foreach(object_class_get_list_tramp,
 876                          implements_type, include_abstract, &list);
 877     return list;
 878 }
 879
 880 void object_ref(Object *obj)
 881 {
 882     if (!obj) {
 883         return;
 884     }
 885     atomic_inc(&obj->ref);
 886 }
 887
 888 void object_unref(Object *obj)
 889 {
 890     if (!obj) {
 891         return;
 892     }
 893     g_assert_cmpint(obj->ref, >, 0);
 894
 895     /* parent always holds a reference to its children */
 896     if (atomic_fetch_dec(&obj->ref) == 1) {
 897         object_finalize(obj);
 898     }
 899 }
 900
 901 ObjectProperty *
 902 object_property_add(Object *obj, const char *name, const char *type,
 903                     ObjectPropertyAccessor *get,
 904                     ObjectPropertyAccessor *set,
 905                     ObjectPropertyRelease *release,
 906                     void *opaque, Error **errp)
 907 {
 908     ObjectProperty *prop;
 909     size_t name_len = strlen(name);
 910
 911     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 912         int i;
 913         ObjectProperty *ret;
 914         char *name_no_array = g_strdup(name);
 915
 916         name_no_array[name_len - 3] = '\0';
 917         for (i = 0; ; ++i) {
 918             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 919
 920             ret = object_property_add(obj, full_name, type, get, set,
 921                                       release, opaque, NULL);
 922             g_free(full_name);
 923             if (ret) {
 924                 break;
 925             }
 926         }
 927         g_free(name_no_array);
 928         return ret;
 929     }
 930
 931     if (object_property_find(obj, name, NULL) != NULL) {
 932         error_setg(errp, "attempt to add duplicate property '%s'"
 933                    " to object (type '%s')", name,
 934                    object_get_typename(obj));
 935         return NULL;
 936     }
 937
 938     prop = g_malloc0(sizeof(*prop));
 939
 940     prop->name = g_strdup(name);
 941     prop->type = g_strdup(type);
 942
 943     prop->get = get;
 944     prop->set = set;
 945     prop->release = release;
 946     prop->opaque = opaque;
 947
 948     g_hash_table_insert(obj->properties, prop->name, prop);
 949     return prop;
 950 }
 951
 952 ObjectProperty *
 953 object_class_property_add(ObjectClass *klass,
 954                           const char *name,
 955                           const char *type,
 956                           ObjectPropertyAccessor *get,
 957                           ObjectPropertyAccessor *set,
 958                           ObjectPropertyRelease *release,
 959                           void *opaque,
 960                           Error **errp)
 961 {
 962     ObjectProperty *prop;
 963
 964     if (object_class_property_find(klass, name, NULL) != NULL) {
 965         error_setg(errp, "attempt to add duplicate property '%s'"
 966                    " to object (type '%s')", name,
 967                    object_class_get_name(klass));
 968         return NULL;
 969     }
 970
 971     prop = g_malloc0(sizeof(*prop));
 972
 973     prop->name = g_strdup(name);
 974     prop->type = g_strdup(type);
 975
 976     prop->get = get;
 977     prop->set = set;
 978     prop->release = release;
 979     prop->opaque = opaque;
 980
 981     g_hash_table_insert(klass->properties, g_strdup(name), prop);
 982
 983     return prop;
 984 }
 985
 986 ObjectProperty *object_property_find(Object *obj, const char *name,
 987                                      Error **errp)
 988 {
 989     ObjectProperty *prop;
 990     ObjectClass *klass = object_get_class(obj);
 991
 992     prop = object_class_property_find(klass, name, NULL);
 993     if (prop) {
 994         return prop;
 995     }
 996
 997     prop = g_hash_table_lookup(obj->properties, name);
 998     if (prop) {
 999         return prop;
1000     }
1001
1002     error_setg(errp, "Property '.%s' not found", name);
1003     return NULL;
1004 }
1005
1006 void object_property_iter_init(ObjectPropertyIterator *iter,
1007                                Object *obj)
1008 {
1009     g_hash_table_iter_init(&iter->iter, obj->properties);
1010     iter->nextclass = object_get_class(obj);
1011 }
1012
1013 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1014 {
1015     gpointer key, val;
1016     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1017         if (!iter->nextclass) {
1018             return NULL;
1019         }
1020         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1021         iter->nextclass = object_class_get_parent(iter->nextclass);
1022     }
1023     return val;
1024 }
1025
1026 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1027                                            Error **errp)
1028 {
1029     ObjectProperty *prop;
1030     ObjectClass *parent_klass;
1031
1032     parent_klass = object_class_get_parent(klass);
1033     if (parent_klass) {
1034         prop = object_class_property_find(parent_klass, name, NULL);
1035         if (prop) {
1036             return prop;
1037         }
1038     }
1039
1040     prop = g_hash_table_lookup(klass->properties, name);
1041     if (!prop) {
1042         error_setg(errp, "Property '.%s' not found", name);
1043     }
1044     return prop;
1045 }
1046
1047 void object_property_del(Object *obj, const char *name, Error **errp)
1048 {
1049     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1050
1051     if (!prop) {
1052         error_setg(errp, "Property '.%s' not found", name);
1053         return;
1054     }
1055
1056     if (prop->release) {
1057         prop->release(obj, name, prop->opaque);
1058     }
1059     g_hash_table_remove(obj->properties, name);
1060 }
1061
1062 void object_property_get(Object *obj, Visitor *v, const char *name,
1063                          Error **errp)
1064 {
1065     ObjectProperty *prop = object_property_find(obj, name, errp);
1066     if (prop == NULL) {
1067         return;
1068     }
1069
1070     if (!prop->get) {
1071         error_setg(errp, QERR_PERMISSION_DENIED);
1072     } else {
1073         prop->get(obj, v, name, prop->opaque, errp);
1074     }
1075 }
1076
1077 void object_property_set(Object *obj, Visitor *v, const char *name,
1078                          Error **errp)
1079 {
1080     ObjectProperty *prop = object_property_find(obj, name, errp);
1081     if (prop == NULL) {
1082         return;
1083     }
1084
1085     if (!prop->set) {
1086         error_setg(errp, QERR_PERMISSION_DENIED);
1087     } else {
1088         prop->set(obj, v, name, prop->opaque, errp);
1089     }
1090 }
1091
1092 void object_property_set_str(Object *obj, const char *value,
1093                              const char *name, Error **errp)
1094 {
1095     QString *qstr = qstring_from_str(value);
1096     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1097
1098     QDECREF(qstr);
1099 }
1100
1101 char *object_property_get_str(Object *obj, const char *name,
1102                               Error **errp)
1103 {
1104     QObject *ret = object_property_get_qobject(obj, name, errp);
1105     QString *qstring;
1106     char *retval;
1107
1108     if (!ret) {
1109         return NULL;
1110     }
1111     qstring = qobject_to_qstring(ret);
1112     if (!qstring) {
1113         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1114         retval = NULL;
1115     } else {
1116         retval = g_strdup(qstring_get_str(qstring));
1117     }
1118
1119     QDECREF(qstring);
1120     return retval;
1121 }
1122
1123 void object_property_set_link(Object *obj, Object *value,
1124                               const char *name, Error **errp)
1125 {
1126     if (value) {
1127         gchar *path = object_get_canonical_path(value);
1128         object_property_set_str(obj, path, name, errp);
1129         g_free(path);
1130     } else {
1131         object_property_set_str(obj, "", name, errp);
1132     }
1133 }
1134
1135 Object *object_property_get_link(Object *obj, const char *name,
1136                                  Error **errp)
1137 {
1138     char *str = object_property_get_str(obj, name, errp);
1139     Object *target = NULL;
1140
1141     if (str && *str) {
1142         target = object_resolve_path(str, NULL);
1143         if (!target) {
1144             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1145                       "Device '%s' not found", str);
1146         }
1147     }
1148
1149     g_free(str);
1150     return target;
1151 }
1152
1153 void object_property_set_bool(Object *obj, bool value,
1154                               const char *name, Error **errp)
1155 {
1156     QBool *qbool = qbool_from_bool(value);
1157     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1158
1159     QDECREF(qbool);
1160 }
1161
1162 bool object_property_get_bool(Object *obj, const char *name,
1163                               Error **errp)
1164 {
1165     QObject *ret = object_property_get_qobject(obj, name, errp);
1166     QBool *qbool;
1167     bool retval;
1168
1169     if (!ret) {
1170         return false;
1171     }
1172     qbool = qobject_to_qbool(ret);
1173     if (!qbool) {
1174         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1175         retval = false;
1176     } else {
1177         retval = qbool_get_bool(qbool);
1178     }
1179
1180     QDECREF(qbool);
1181     return retval;
1182 }
1183
1184 void object_property_set_int(Object *obj, int64_t value,
1185                              const char *name, Error **errp)
1186 {
1187     QInt *qint = qint_from_int(value);
1188     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1189
1190     QDECREF(qint);
1191 }
1192
1193 int64_t object_property_get_int(Object *obj, const char *name,
1194                                 Error **errp)
1195 {
1196     QObject *ret = object_property_get_qobject(obj, name, errp);
1197     QInt *qint;
1198     int64_t retval;
1199
1200     if (!ret) {
1201         return -1;
1202     }
1203     qint = qobject_to_qint(ret);
1204     if (!qint) {
1205         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1206         retval = -1;
1207     } else {
1208         retval = qint_get_int(qint);
1209     }
1210
1211     QDECREF(qint);
1212     return retval;
1213 }
1214
1215 typedef struct EnumProperty {
1216     const char * const *strings;
1217     int (*get)(Object *, Error **);
1218     void (*set)(Object *, int, Error **);
1219 } EnumProperty;
1220
1221 int object_property_get_enum(Object *obj, const char *name,
1222                              const char *typename, Error **errp)
1223 {
1224     Error *err = NULL;
1225     Visitor *v;
1226     char *str;
1227     int ret;
1228     ObjectProperty *prop = object_property_find(obj, name, errp);
1229     EnumProperty *enumprop;
1230
1231     if (prop == NULL) {
1232         return 0;
1233     }
1234
1235     if (!g_str_equal(prop->type, typename)) {
1236         error_setg(errp, "Property %s on %s is not '%s' enum type",
1237                    name, object_class_get_name(
1238                        object_get_class(obj)), typename);
1239         return 0;
1240     }
1241
1242     enumprop = prop->opaque;
1243
1244     v = string_output_visitor_new(false, &str);
1245     object_property_get(obj, v, name, &err);
1246     if (err) {
1247         error_propagate(errp, err);
1248         visit_free(v);
1249         return 0;
1250     }
1251     visit_complete(v, &str);
1252     visit_free(v);
1253     v = string_input_visitor_new(str);
1254     visit_type_enum(v, name, &ret, enumprop->strings, errp);
1255
1256     g_free(str);
1257     visit_free(v);
1258
1259     return ret;
1260 }
1261
1262 void object_property_get_uint16List(Object *obj, const char *name,
1263                                     uint16List **list, Error **errp)
1264 {
1265     Error *err = NULL;
1266     Visitor *v;
1267     char *str;
1268
1269     v = string_output_visitor_new(false, &str);
1270     object_property_get(obj, v, name, &err);
1271     if (err) {
1272         error_propagate(errp, err);
1273         goto out;
1274     }
1275     visit_complete(v, &str);
1276     visit_free(v);
1277     v = string_input_visitor_new(str);
1278     visit_type_uint16List(v, NULL, list, errp);
1279
1280     g_free(str);
1281 out:
1282     visit_free(v);
1283 }
1284
1285 void object_property_parse(Object *obj, const char *string,
1286                            const char *name, Error **errp)
1287 {
1288     Visitor *v = string_input_visitor_new(string);
1289     object_property_set(obj, v, name, errp);
1290     visit_free(v);
1291 }
1292
1293 char *object_property_print(Object *obj, const char *name, bool human,
1294                             Error **errp)
1295 {
1296     Visitor *v;
1297     char *string = NULL;
1298     Error *local_err = NULL;
1299
1300     v = string_output_visitor_new(human, &string);
1301     object_property_get(obj, v, name, &local_err);
1302     if (local_err) {
1303         error_propagate(errp, local_err);
1304         goto out;
1305     }
1306
1307     visit_complete(v, &string);
1308
1309 out:
1310     visit_free(v);
1311     return string;
1312 }
1313
1314 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1315 {
1316     ObjectProperty *prop = object_property_find(obj, name, errp);
1317     if (prop == NULL) {
1318         return NULL;
1319     }
1320
1321     return prop->type;
1322 }
1323
1324 Object *object_get_root(void)
1325 {
1326     static Object *root;
1327
1328     if (!root) {
1329         root = object_new("container");
1330     }
1331
1332     return root;
1333 }
1334
1335 Object *object_get_objects_root(void)
1336 {
1337     return container_get(object_get_root(), "/objects");
1338 }
1339
1340 static void object_get_child_property(Object *obj, Visitor *v,
1341                                       const char *name, void *opaque,
1342                                       Error **errp)
1343 {
1344     Object *child = opaque;
1345     gchar *path;
1346
1347     path = object_get_canonical_path(child);
1348     visit_type_str(v, name, &path, errp);
1349     g_free(path);
1350 }
1351
1352 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1353 {
1354     return opaque;
1355 }
1356
1357 static void object_finalize_child_property(Object *obj, const char *name,
1358                                            void *opaque)
1359 {
1360     Object *child = opaque;
1361
1362     if (child->class->unparent) {
1363         (child->class->unparent)(child);
1364     }
1365     child->parent = NULL;
1366     object_unref(child);
1367 }
1368
1369 void object_property_add_child(Object *obj, const char *name,
1370                                Object *child, Error **errp)
1371 {
1372     Error *local_err = NULL;
1373     gchar *type;
1374     ObjectProperty *op;
1375
1376     if (child->parent != NULL) {
1377         error_setg(errp, "child object is already parented");
1378         return;
1379     }
1380
1381     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1382
1383     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1384                              object_finalize_child_property, child, &local_err);
1385     if (local_err) {
1386         error_propagate(errp, local_err);
1387         goto out;
1388     }
1389
1390     op->resolve = object_resolve_child_property;
1391     object_ref(child);
1392     child->parent = obj;
1393
1394 out:
1395     g_free(type);
1396 }
1397
1398 void object_property_allow_set_link(Object *obj, const char *name,
1399                                     Object *val, Error **errp)
1400 {
1401     /* Allow the link to be set, always */
1402 }
1403
1404 typedef struct {
1405     Object **child;
1406     void (*check)(Object *, const char *, Object *, Error **);
1407     ObjectPropertyLinkFlags flags;
1408 } LinkProperty;
1409
1410 static void object_get_link_property(Object *obj, Visitor *v,
1411                                      const char *name, void *opaque,
1412                                      Error **errp)
1413 {
1414     LinkProperty *lprop = opaque;
1415     Object **child = lprop->child;
1416     gchar *path;
1417
1418     if (*child) {
1419         path = object_get_canonical_path(*child);
1420         visit_type_str(v, name, &path, errp);
1421         g_free(path);
1422     } else {
1423         path = (gchar *)"";
1424         visit_type_str(v, name, &path, errp);
1425     }
1426 }
1427
1428 /*
1429  * object_resolve_link:
1430  *
1431  * Lookup an object and ensure its type matches the link property type.  This
1432  * is similar to object_resolve_path() except type verification against the
1433  * link property is performed.
1434  *
1435  * Returns: The matched object or NULL on path lookup failures.
1436  */
1437 static Object *object_resolve_link(Object *obj, const char *name,
1438                                    const char *path, Error **errp)
1439 {
1440     const char *type;
1441     gchar *target_type;
1442     bool ambiguous = false;
1443     Object *target;
1444
1445     /* Go from link<FOO> to FOO.  */
1446     type = object_property_get_type(obj, name, NULL);
1447     target_type = g_strndup(&type[5], strlen(type) - 6);
1448     target = object_resolve_path_type(path, target_type, &ambiguous);
1449
1450     if (ambiguous) {
1451         error_setg(errp, "Path '%s' does not uniquely identify an object",
1452                    path);
1453     } else if (!target) {
1454         target = object_resolve_path(path, &ambiguous);
1455         if (target || ambiguous) {
1456             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1457         } else {
1458             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1459                       "Device '%s' not found", path);
1460         }
1461         target = NULL;
1462     }
1463     g_free(target_type);
1464
1465     return target;
1466 }
1467
1468 static void object_set_link_property(Object *obj, Visitor *v,
1469                                      const char *name, void *opaque,
1470                                      Error **errp)
1471 {
1472     Error *local_err = NULL;
1473     LinkProperty *prop = opaque;
1474     Object **child = prop->child;
1475     Object *old_target = *child;
1476     Object *new_target = NULL;
1477     char *path = NULL;
1478
1479     visit_type_str(v, name, &path, &local_err);
1480
1481     if (!local_err && strcmp(path, "") != 0) {
1482         new_target = object_resolve_link(obj, name, path, &local_err);
1483     }
1484
1485     g_free(path);
1486     if (local_err) {
1487         error_propagate(errp, local_err);
1488         return;
1489     }
1490
1491     prop->check(obj, name, new_target, &local_err);
1492     if (local_err) {
1493         error_propagate(errp, local_err);
1494         return;
1495     }
1496
1497     object_ref(new_target);
1498     *child = new_target;
1499     object_unref(old_target);
1500 }
1501
1502 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1503 {
1504     LinkProperty *lprop = opaque;
1505
1506     return *lprop->child;
1507 }
1508
1509 static void object_release_link_property(Object *obj, const char *name,
1510                                          void *opaque)
1511 {
1512     LinkProperty *prop = opaque;
1513
1514     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1515         object_unref(*prop->child);
1516     }
1517     g_free(prop);
1518 }
1519
1520 void object_property_add_link(Object *obj, const char *name,
1521                               const char *type, Object **child,
1522                               void (*check)(Object *, const char *,
1523                                             Object *, Error **),
1524                               ObjectPropertyLinkFlags flags,
1525                               Error **errp)
1526 {
1527     Error *local_err = NULL;
1528     LinkProperty *prop = g_malloc(sizeof(*prop));
1529     gchar *full_type;
1530     ObjectProperty *op;
1531
1532     prop->child = child;
1533     prop->check = check;
1534     prop->flags = flags;
1535
1536     full_type = g_strdup_printf("link<%s>", type);
1537
1538     op = object_property_add(obj, name, full_type,
1539                              object_get_link_property,
1540                              check ? object_set_link_property : NULL,
1541                              object_release_link_property,
1542                              prop,
1543                              &local_err);
1544     if (local_err) {
1545         error_propagate(errp, local_err);
1546         g_free(prop);
1547         goto out;
1548     }
1549
1550     op->resolve = object_resolve_link_property;
1551
1552 out:
1553     g_free(full_type);
1554 }
1555
1556 void object_property_add_const_link(Object *obj, const char *name,
1557                                     Object *target, Error **errp)
1558 {
1559     char *link_type;
1560     ObjectProperty *op;
1561
1562     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1563     op = object_property_add(obj, name, link_type,
1564                              object_get_child_property, NULL,
1565                              NULL, target, errp);
1566     if (op != NULL) {
1567         op->resolve = object_resolve_child_property;
1568     }
1569     g_free(link_type);
1570 }
1571
1572 gchar *object_get_canonical_path_component(Object *obj)
1573 {
1574     ObjectProperty *prop = NULL;
1575     GHashTableIter iter;
1576
1577     g_assert(obj);
1578     g_assert(obj->parent != NULL);
1579
1580     g_hash_table_iter_init(&iter, obj->parent->properties);
1581     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1582         if (!object_property_is_child(prop)) {
1583             continue;
1584         }
1585
1586         if (prop->opaque == obj) {
1587             return g_strdup(prop->name);
1588         }
1589     }
1590
1591     /* obj had a parent but was not a child, should never happen */
1592     g_assert_not_reached();
1593     return NULL;
1594 }
1595
1596 gchar *object_get_canonical_path(Object *obj)
1597 {
1598     Object *root = object_get_root();
1599     char *newpath, *path = NULL;
1600
1601     while (obj != root) {
1602         char *component = object_get_canonical_path_component(obj);
1603
1604         if (path) {
1605             newpath = g_strdup_printf("%s/%s", component, path);
1606             g_free(component);
1607             g_free(path);
1608             path = newpath;
1609         } else {
1610             path = component;
1611         }
1612
1613         obj = obj->parent;
1614     }
1615
1616     newpath = g_strdup_printf("/%s", path ? path : "");
1617     g_free(path);
1618
1619     return newpath;
1620 }
1621
1622 Object *object_resolve_path_component(Object *parent, const gchar *part)
1623 {
1624     ObjectProperty *prop = object_property_find(parent, part, NULL);
1625     if (prop == NULL) {
1626         return NULL;
1627     }
1628
1629     if (prop->resolve) {
1630         return prop->resolve(parent, prop->opaque, part);
1631     } else {
1632         return NULL;
1633     }
1634 }
1635
1636 static Object *object_resolve_abs_path(Object *parent,
1637                                           gchar **parts,
1638                                           const char *typename,
1639                                           int index)
1640 {
1641     Object *child;
1642
1643     if (parts[index] == NULL) {
1644         return object_dynamic_cast(parent, typename);
1645     }
1646
1647     if (strcmp(parts[index], "") == 0) {
1648         return object_resolve_abs_path(parent, parts, typename, index + 1);
1649     }
1650
1651     child = object_resolve_path_component(parent, parts[index]);
1652     if (!child) {
1653         return NULL;
1654     }
1655
1656     return object_resolve_abs_path(child, parts, typename, index + 1);
1657 }
1658
1659 static Object *object_resolve_partial_path(Object *parent,
1660                                               gchar **parts,
1661                                               const char *typename,
1662                                               bool *ambiguous)
1663 {
1664     Object *obj;
1665     GHashTableIter iter;
1666     ObjectProperty *prop;
1667
1668     obj = object_resolve_abs_path(parent, parts, typename, 0);
1669
1670     g_hash_table_iter_init(&iter, parent->properties);
1671     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1672         Object *found;
1673
1674         if (!object_property_is_child(prop)) {
1675             continue;
1676         }
1677
1678         found = object_resolve_partial_path(prop->opaque, parts,
1679                                             typename, ambiguous);
1680         if (found) {
1681             if (obj) {
1682                 if (ambiguous) {
1683                     *ambiguous = true;
1684                 }
1685                 return NULL;
1686             }
1687             obj = found;
1688         }
1689
1690         if (ambiguous && *ambiguous) {
1691             return NULL;
1692         }
1693     }
1694
1695     return obj;
1696 }
1697
1698 Object *object_resolve_path_type(const char *path, const char *typename,
1699                                  bool *ambiguous)
1700 {
1701     Object *obj;
1702     gchar **parts;
1703
1704     parts = g_strsplit(path, "/", 0);
1705     assert(parts);
1706
1707     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1708         if (ambiguous) {
1709             *ambiguous = false;
1710         }
1711         obj = object_resolve_partial_path(object_get_root(), parts,
1712                                           typename, ambiguous);
1713     } else {
1714         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1715     }
1716
1717     g_strfreev(parts);
1718
1719     return obj;
1720 }
1721
1722 Object *object_resolve_path(const char *path, bool *ambiguous)
1723 {
1724     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1725 }
1726
1727 typedef struct StringProperty
1728 {
1729     char *(*get)(Object *, Error **);
1730     void (*set)(Object *, const char *, Error **);
1731 } StringProperty;
1732
1733 static void property_get_str(Object *obj, Visitor *v, const char *name,
1734                              void *opaque, Error **errp)
1735 {
1736     StringProperty *prop = opaque;
1737     char *value;
1738     Error *err = NULL;
1739
1740     value = prop->get(obj, &err);
1741     if (err) {
1742         error_propagate(errp, err);
1743         return;
1744     }
1745
1746     visit_type_str(v, name, &value, errp);
1747     g_free(value);
1748 }
1749
1750 static void property_set_str(Object *obj, Visitor *v, const char *name,
1751                              void *opaque, Error **errp)
1752 {
1753     StringProperty *prop = opaque;
1754     char *value;
1755     Error *local_err = NULL;
1756
1757     visit_type_str(v, name, &value, &local_err);
1758     if (local_err) {
1759         error_propagate(errp, local_err);
1760         return;
1761     }
1762
1763     prop->set(obj, value, errp);
1764     g_free(value);
1765 }
1766
1767 static void property_release_str(Object *obj, const char *name,
1768                                  void *opaque)
1769 {
1770     StringProperty *prop = opaque;
1771     g_free(prop);
1772 }
1773
1774 void object_property_add_str(Object *obj, const char *name,
1775                            char *(*get)(Object *, Error **),
1776                            void (*set)(Object *, const char *, Error **),
1777                            Error **errp)
1778 {
1779     Error *local_err = NULL;
1780     StringProperty *prop = g_malloc0(sizeof(*prop));
1781
1782     prop->get = get;
1783     prop->set = set;
1784
1785     object_property_add(obj, name, "string",
1786                         get ? property_get_str : NULL,
1787                         set ? property_set_str : NULL,
1788                         property_release_str,
1789                         prop, &local_err);
1790     if (local_err) {
1791         error_propagate(errp, local_err);
1792         g_free(prop);
1793     }
1794 }
1795
1796 void object_class_property_add_str(ObjectClass *klass, const char *name,
1797                                    char *(*get)(Object *, Error **),
1798                                    void (*set)(Object *, const char *,
1799                                                Error **),
1800                                    Error **errp)
1801 {
1802     Error *local_err = NULL;
1803     StringProperty *prop = g_malloc0(sizeof(*prop));
1804
1805     prop->get = get;
1806     prop->set = set;
1807
1808     object_class_property_add(klass, name, "string",
1809                               get ? property_get_str : NULL,
1810                               set ? property_set_str : NULL,
1811                               property_release_str,
1812                               prop, &local_err);
1813     if (local_err) {
1814         error_propagate(errp, local_err);
1815         g_free(prop);
1816     }
1817 }
1818
1819 typedef struct BoolProperty
1820 {
1821     bool (*get)(Object *, Error **);
1822     void (*set)(Object *, bool, Error **);
1823 } BoolProperty;
1824
1825 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1826                               void *opaque, Error **errp)
1827 {
1828     BoolProperty *prop = opaque;
1829     bool value;
1830     Error *err = NULL;
1831
1832     value = prop->get(obj, &err);
1833     if (err) {
1834         error_propagate(errp, err);
1835         return;
1836     }
1837
1838     visit_type_bool(v, name, &value, errp);
1839 }
1840
1841 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1842                               void *opaque, Error **errp)
1843 {
1844     BoolProperty *prop = opaque;
1845     bool value;
1846     Error *local_err = NULL;
1847
1848     visit_type_bool(v, name, &value, &local_err);
1849     if (local_err) {
1850         error_propagate(errp, local_err);
1851         return;
1852     }
1853
1854     prop->set(obj, value, errp);
1855 }
1856
1857 static void property_release_bool(Object *obj, const char *name,
1858                                   void *opaque)
1859 {
1860     BoolProperty *prop = opaque;
1861     g_free(prop);
1862 }
1863
1864 void object_property_add_bool(Object *obj, const char *name,
1865                               bool (*get)(Object *, Error **),
1866                               void (*set)(Object *, bool, Error **),
1867                               Error **errp)
1868 {
1869     Error *local_err = NULL;
1870     BoolProperty *prop = g_malloc0(sizeof(*prop));
1871
1872     prop->get = get;
1873     prop->set = set;
1874
1875     object_property_add(obj, name, "bool",
1876                         get ? property_get_bool : NULL,
1877                         set ? property_set_bool : NULL,
1878                         property_release_bool,
1879                         prop, &local_err);
1880     if (local_err) {
1881         error_propagate(errp, local_err);
1882         g_free(prop);
1883     }
1884 }
1885
1886 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1887                                     bool (*get)(Object *, Error **),
1888                                     void (*set)(Object *, bool, Error **),
1889                                     Error **errp)
1890 {
1891     Error *local_err = NULL;
1892     BoolProperty *prop = g_malloc0(sizeof(*prop));
1893
1894     prop->get = get;
1895     prop->set = set;
1896
1897     object_class_property_add(klass, name, "bool",
1898                               get ? property_get_bool : NULL,
1899                               set ? property_set_bool : NULL,
1900                               property_release_bool,
1901                               prop, &local_err);
1902     if (local_err) {
1903         error_propagate(errp, local_err);
1904         g_free(prop);
1905     }
1906 }
1907
1908 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1909                               void *opaque, Error **errp)
1910 {
1911     EnumProperty *prop = opaque;
1912     int value;
1913     Error *err = NULL;
1914
1915     value = prop->get(obj, &err);
1916     if (err) {
1917         error_propagate(errp, err);
1918         return;
1919     }
1920
1921     visit_type_enum(v, name, &value, prop->strings, errp);
1922 }
1923
1924 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1925                               void *opaque, Error **errp)
1926 {
1927     EnumProperty *prop = opaque;
1928     int value;
1929     Error *err = NULL;
1930
1931     visit_type_enum(v, name, &value, prop->strings, &err);
1932     if (err) {
1933         error_propagate(errp, err);
1934         return;
1935     }
1936     prop->set(obj, value, errp);
1937 }
1938
1939 static void property_release_enum(Object *obj, const char *name,
1940                                   void *opaque)
1941 {
1942     EnumProperty *prop = opaque;
1943     g_free(prop);
1944 }
1945
1946 void object_property_add_enum(Object *obj, const char *name,
1947                               const char *typename,
1948                               const char * const *strings,
1949                               int (*get)(Object *, Error **),
1950                               void (*set)(Object *, int, Error **),
1951                               Error **errp)
1952 {
1953     Error *local_err = NULL;
1954     EnumProperty *prop = g_malloc(sizeof(*prop));
1955
1956     prop->strings = strings;
1957     prop->get = get;
1958     prop->set = set;
1959
1960     object_property_add(obj, name, typename,
1961                         get ? property_get_enum : NULL,
1962                         set ? property_set_enum : NULL,
1963                         property_release_enum,
1964                         prop, &local_err);
1965     if (local_err) {
1966         error_propagate(errp, local_err);
1967         g_free(prop);
1968     }
1969 }
1970
1971 void object_class_property_add_enum(ObjectClass *klass, const char *name,
1972                                     const char *typename,
1973                                     const char * const *strings,
1974                                     int (*get)(Object *, Error **),
1975                                     void (*set)(Object *, int, Error **),
1976                                     Error **errp)
1977 {
1978     Error *local_err = NULL;
1979     EnumProperty *prop = g_malloc(sizeof(*prop));
1980
1981     prop->strings = strings;
1982     prop->get = get;
1983     prop->set = set;
1984
1985     object_class_property_add(klass, name, typename,
1986                               get ? property_get_enum : NULL,
1987                               set ? property_set_enum : NULL,
1988                               property_release_enum,
1989                               prop, &local_err);
1990     if (local_err) {
1991         error_propagate(errp, local_err);
1992         g_free(prop);
1993     }
1994 }
1995
1996 typedef struct TMProperty {
1997     void (*get)(Object *, struct tm *, Error **);
1998 } TMProperty;
1999
2000 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2001                             void *opaque, Error **errp)
2002 {
2003     TMProperty *prop = opaque;
2004     Error *err = NULL;
2005     struct tm value;
2006
2007     prop->get(obj, &value, &err);
2008     if (err) {
2009         goto out;
2010     }
2011
2012     visit_start_struct(v, name, NULL, 0, &err);
2013     if (err) {
2014         goto out;
2015     }
2016     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2017     if (err) {
2018         goto out_end;
2019     }
2020     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2021     if (err) {
2022         goto out_end;
2023     }
2024     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2025     if (err) {
2026         goto out_end;
2027     }
2028     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2029     if (err) {
2030         goto out_end;
2031     }
2032     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2033     if (err) {
2034         goto out_end;
2035     }
2036     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2037     if (err) {
2038         goto out_end;
2039     }
2040     visit_check_struct(v, &err);
2041 out_end:
2042     visit_end_struct(v, NULL);
2043 out:
2044     error_propagate(errp, err);
2045
2046 }
2047
2048 static void property_release_tm(Object *obj, const char *name,
2049                                 void *opaque)
2050 {
2051     TMProperty *prop = opaque;
2052     g_free(prop);
2053 }
2054
2055 void object_property_add_tm(Object *obj, const char *name,
2056                             void (*get)(Object *, struct tm *, Error **),
2057                             Error **errp)
2058 {
2059     Error *local_err = NULL;
2060     TMProperty *prop = g_malloc0(sizeof(*prop));
2061
2062     prop->get = get;
2063
2064     object_property_add(obj, name, "struct tm",
2065                         get ? property_get_tm : NULL, NULL,
2066                         property_release_tm,
2067                         prop, &local_err);
2068     if (local_err) {
2069         error_propagate(errp, local_err);
2070         g_free(prop);
2071     }
2072 }
2073
2074 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2075                                   void (*get)(Object *, struct tm *, Error **),
2076                                   Error **errp)
2077 {
2078     Error *local_err = NULL;
2079     TMProperty *prop = g_malloc0(sizeof(*prop));
2080
2081     prop->get = get;
2082
2083     object_class_property_add(klass, name, "struct tm",
2084                               get ? property_get_tm : NULL, NULL,
2085                               property_release_tm,
2086                               prop, &local_err);
2087     if (local_err) {
2088         error_propagate(errp, local_err);
2089         g_free(prop);
2090     }
2091 }
2092
2093 static char *qdev_get_type(Object *obj, Error **errp)
2094 {
2095     return g_strdup(object_get_typename(obj));
2096 }
2097
2098 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2099                                    void *opaque, Error **errp)
2100 {
2101     uint8_t value = *(uint8_t *)opaque;
2102     visit_type_uint8(v, name, &value, errp);
2103 }
2104
2105 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2106                                     void *opaque, Error **errp)
2107 {
2108     uint16_t value = *(uint16_t *)opaque;
2109     visit_type_uint16(v, name, &value, errp);
2110 }
2111
2112 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2113                                     void *opaque, Error **errp)
2114 {
2115     uint32_t value = *(uint32_t *)opaque;
2116     visit_type_uint32(v, name, &value, errp);
2117 }
2118
2119 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2120                                     void *opaque, Error **errp)
2121 {
2122     uint64_t value = *(uint64_t *)opaque;
2123     visit_type_uint64(v, name, &value, errp);
2124 }
2125
2126 void object_property_add_uint8_ptr(Object *obj, const char *name,
2127                                    const uint8_t *v, Error **errp)
2128 {
2129     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2130                         NULL, NULL, (void *)v, errp);
2131 }
2132
2133 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2134                                          const uint8_t *v, Error **errp)
2135 {
2136     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2137                               NULL, NULL, (void *)v, errp);
2138 }
2139
2140 void object_property_add_uint16_ptr(Object *obj, const char *name,
2141                                     const uint16_t *v, Error **errp)
2142 {
2143     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2144                         NULL, NULL, (void *)v, errp);
2145 }
2146
2147 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2148                                           const uint16_t *v, Error **errp)
2149 {
2150     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2151                               NULL, NULL, (void *)v, errp);
2152 }
2153
2154 void object_property_add_uint32_ptr(Object *obj, const char *name,
2155                                     const uint32_t *v, Error **errp)
2156 {
2157     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2158                         NULL, NULL, (void *)v, errp);
2159 }
2160
2161 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2162                                           const uint32_t *v, Error **errp)
2163 {
2164     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2165                               NULL, NULL, (void *)v, errp);
2166 }
2167
2168 void object_property_add_uint64_ptr(Object *obj, const char *name,
2169                                     const uint64_t *v, Error **errp)
2170 {
2171     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2172                         NULL, NULL, (void *)v, errp);
2173 }
2174
2175 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2176                                           const uint64_t *v, Error **errp)
2177 {
2178     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2179                               NULL, NULL, (void *)v, errp);
2180 }
2181
2182 typedef struct {
2183     Object *target_obj;
2184     char *target_name;
2185 } AliasProperty;
2186
2187 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2188                                void *opaque, Error **errp)
2189 {
2190     AliasProperty *prop = opaque;
2191
2192     object_property_get(prop->target_obj, v, prop->target_name, errp);
2193 }
2194
2195 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2196                                void *opaque, Error **errp)
2197 {
2198     AliasProperty *prop = opaque;
2199
2200     object_property_set(prop->target_obj, v, prop->target_name, errp);
2201 }
2202
2203 static Object *property_resolve_alias(Object *obj, void *opaque,
2204                                       const gchar *part)
2205 {
2206     AliasProperty *prop = opaque;
2207
2208     return object_resolve_path_component(prop->target_obj, prop->target_name);
2209 }
2210
2211 static void property_release_alias(Object *obj, const char *name, void *opaque)
2212 {
2213     AliasProperty *prop = opaque;
2214
2215     g_free(prop->target_name);
2216     g_free(prop);
2217 }
2218
2219 void object_property_add_alias(Object *obj, const char *name,
2220                                Object *target_obj, const char *target_name,
2221                                Error **errp)
2222 {
2223     AliasProperty *prop;
2224     ObjectProperty *op;
2225     ObjectProperty *target_prop;
2226     gchar *prop_type;
2227     Error *local_err = NULL;
2228
2229     target_prop = object_property_find(target_obj, target_name, errp);
2230     if (!target_prop) {
2231         return;
2232     }
2233
2234     if (object_property_is_child(target_prop)) {
2235         prop_type = g_strdup_printf("link%s",
2236                                     target_prop->type + strlen("child"));
2237     } else {
2238         prop_type = g_strdup(target_prop->type);
2239     }
2240
2241     prop = g_malloc(sizeof(*prop));
2242     prop->target_obj = target_obj;
2243     prop->target_name = g_strdup(target_name);
2244
2245     op = object_property_add(obj, name, prop_type,
2246                              property_get_alias,
2247                              property_set_alias,
2248                              property_release_alias,
2249                              prop, &local_err);
2250     if (local_err) {
2251         error_propagate(errp, local_err);
2252         g_free(prop);
2253         goto out;
2254     }
2255     op->resolve = property_resolve_alias;
2256
2257     object_property_set_description(obj, op->name,
2258                                     target_prop->description,
2259                                     &error_abort);
2260
2261 out:
2262     g_free(prop_type);
2263 }
2264
2265 void object_property_set_description(Object *obj, const char *name,
2266                                      const char *description, Error **errp)
2267 {
2268     ObjectProperty *op;
2269
2270     op = object_property_find(obj, name, errp);
2271     if (!op) {
2272         return;
2273     }
2274
2275     g_free(op->description);
2276     op->description = g_strdup(description);
2277 }
2278
2279 void object_class_property_set_description(ObjectClass *klass,
2280                                            const char *name,
2281                                            const char *description,
2282                                            Error **errp)
2283 {
2284     ObjectProperty *op;
2285
2286     op = g_hash_table_lookup(klass->properties, name);
2287     if (!op) {
2288         error_setg(errp, "Property '.%s' not found", name);
2289         return;
2290     }
2291
2292     g_free(op->description);
2293     op->description = g_strdup(description);
2294 }
2295
2296 static void object_instance_init(Object *obj)
2297 {
2298     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2299 }
2300
2301 static void register_types(void)
2302 {
2303     static TypeInfo interface_info = {
2304         .name = TYPE_INTERFACE,
2305         .class_size = sizeof(InterfaceClass),
2306         .abstract = true,
2307     };
2308
2309     static TypeInfo object_info = {
2310         .name = TYPE_OBJECT,
2311         .instance_size = sizeof(Object),
2312         .instance_init = object_instance_init,
2313         .abstract = true,
2314     };
2315
2316     type_interface = type_register_internal(&interface_info);
2317     type_register_internal(&object_info);
2318 }
2319
2320 type_init(register_types)