qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <[email protected]>
   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     /* Any type with zero instance_size is implicitly abstract.
 276      * This means interface types are all abstract.
 277      */
 278     if (ti->instance_size == 0) {
 279         ti->abstract = true;
 280     }
 281
 282     ti->class = g_malloc0(ti->class_size);
 283
 284     parent = type_get_parent(ti);
 285     if (parent) {
 286         type_initialize(parent);
 287         GSList *e;
 288         int i;
 289
 290         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 291         memcpy(ti->class, parent->class, parent->class_size);
 292         ti->class->interfaces = NULL;
 293         ti->class->properties = g_hash_table_new_full(
 294             g_str_hash, g_str_equal, g_free, object_property_free);
 295
 296         for (e = parent->class->interfaces; e; e = e->next) {
 297             InterfaceClass *iface = e->data;
 298             ObjectClass *klass = OBJECT_CLASS(iface);
 299
 300             type_initialize_interface(ti, iface->interface_type, klass->type);
 301         }
 302
 303         for (i = 0; i < ti->num_interfaces; i++) {
 304             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 305             for (e = ti->class->interfaces; e; e = e->next) {
 306                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 307
 308                 if (type_is_ancestor(target_type, t)) {
 309                     break;
 310                 }
 311             }
 312
 313             if (e) {
 314                 continue;
 315             }
 316
 317             type_initialize_interface(ti, t, t);
 318         }
 319     } else {
 320         ti->class->properties = g_hash_table_new_full(
 321             g_str_hash, g_str_equal, g_free, object_property_free);
 322     }
 323
 324     ti->class->type = ti;
 325
 326     while (parent) {
 327         if (parent->class_base_init) {
 328             parent->class_base_init(ti->class, ti->class_data);
 329         }
 330         parent = type_get_parent(parent);
 331     }
 332
 333     if (ti->class_init) {
 334         ti->class_init(ti->class, ti->class_data);
 335     }
 336 }
 337
 338 static void object_init_with_type(Object *obj, TypeImpl *ti)
 339 {
 340     if (type_has_parent(ti)) {
 341         object_init_with_type(obj, type_get_parent(ti));
 342     }
 343
 344     if (ti->instance_init) {
 345         ti->instance_init(obj);
 346     }
 347 }
 348
 349 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 350 {
 351     if (ti->instance_post_init) {
 352         ti->instance_post_init(obj);
 353     }
 354
 355     if (type_has_parent(ti)) {
 356         object_post_init_with_type(obj, type_get_parent(ti));
 357     }
 358 }
 359
 360 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 361 {
 362     Object *obj = data;
 363
 364     g_assert(type != NULL);
 365     type_initialize(type);
 366
 367     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 368     g_assert(type->abstract == false);
 369     g_assert_cmpint(size, >=, type->instance_size);
 370
 371     memset(obj, 0, type->instance_size);
 372     obj->class = type->class;
 373     object_ref(obj);
 374     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 375                                             NULL, object_property_free);
 376     object_init_with_type(obj, type);
 377     object_post_init_with_type(obj, type);
 378 }
 379
 380 void object_initialize(void *data, size_t size, const char *typename)
 381 {
 382     TypeImpl *type = type_get_by_name(typename);
 383
 384     object_initialize_with_type(data, size, type);
 385 }
 386
 387 static inline bool object_property_is_child(ObjectProperty *prop)
 388 {
 389     return strstart(prop->type, "child<", NULL);
 390 }
 391
 392 static void object_property_del_all(Object *obj)
 393 {
 394     ObjectProperty *prop;
 395     GHashTableIter iter;
 396     gpointer key, value;
 397     bool released;
 398
 399     do {
 400         released = false;
 401         g_hash_table_iter_init(&iter, obj->properties);
 402         while (g_hash_table_iter_next(&iter, &key, &value)) {
 403             prop = value;
 404             if (prop->release) {
 405                 prop->release(obj, prop->name, prop->opaque);
 406                 prop->release = NULL;
 407                 released = true;
 408                 break;
 409             }
 410             g_hash_table_iter_remove(&iter);
 411         }
 412     } while (released);
 413
 414     g_hash_table_unref(obj->properties);
 415 }
 416
 417 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 418 {
 419     ObjectProperty *prop;
 420     GHashTableIter iter;
 421     gpointer key, value;
 422
 423     g_hash_table_iter_init(&iter, obj->properties);
 424     while (g_hash_table_iter_next(&iter, &key, &value)) {
 425         prop = value;
 426         if (object_property_is_child(prop) && prop->opaque == child) {
 427             if (prop->release) {
 428                 prop->release(obj, prop->name, prop->opaque);
 429                 prop->release = NULL;
 430             }
 431             break;
 432         }
 433     }
 434     g_hash_table_iter_init(&iter, obj->properties);
 435     while (g_hash_table_iter_next(&iter, &key, &value)) {
 436         prop = value;
 437         if (object_property_is_child(prop) && prop->opaque == child) {
 438             g_hash_table_iter_remove(&iter);
 439             break;
 440         }
 441     }
 442 }
 443
 444 void object_unparent(Object *obj)
 445 {
 446     if (obj->parent) {
 447         object_property_del_child(obj->parent, obj, NULL);
 448     }
 449 }
 450
 451 static void object_deinit(Object *obj, TypeImpl *type)
 452 {
 453     if (type->instance_finalize) {
 454         type->instance_finalize(obj);
 455     }
 456
 457     if (type_has_parent(type)) {
 458         object_deinit(obj, type_get_parent(type));
 459     }
 460 }
 461
 462 static void object_finalize(void *data)
 463 {
 464     Object *obj = data;
 465     TypeImpl *ti = obj->class->type;
 466
 467     object_property_del_all(obj);
 468     object_deinit(obj, ti);
 469
 470     g_assert_cmpint(obj->ref, ==, 0);
 471     if (obj->free) {
 472         obj->free(obj);
 473     }
 474 }
 475
 476 static Object *object_new_with_type(Type type)
 477 {
 478     Object *obj;
 479
 480     g_assert(type != NULL);
 481     type_initialize(type);
 482
 483     obj = g_malloc(type->instance_size);
 484     object_initialize_with_type(obj, type->instance_size, type);
 485     obj->free = g_free;
 486
 487     return obj;
 488 }
 489
 490 Object *object_new(const char *typename)
 491 {
 492     TypeImpl *ti = type_get_by_name(typename);
 493
 494     return object_new_with_type(ti);
 495 }
 496
 497
 498 Object *object_new_with_props(const char *typename,
 499                               Object *parent,
 500                               const char *id,
 501                               Error **errp,
 502                               ...)
 503 {
 504     va_list vargs;
 505     Object *obj;
 506
 507     va_start(vargs, errp);
 508     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 509     va_end(vargs);
 510
 511     return obj;
 512 }
 513
 514
 515 Object *object_new_with_propv(const char *typename,
 516                               Object *parent,
 517                               const char *id,
 518                               Error **errp,
 519                               va_list vargs)
 520 {
 521     Object *obj;
 522     ObjectClass *klass;
 523     Error *local_err = NULL;
 524
 525     klass = object_class_by_name(typename);
 526     if (!klass) {
 527         error_setg(errp, "invalid object type: %s", typename);
 528         return NULL;
 529     }
 530
 531     if (object_class_is_abstract(klass)) {
 532         error_setg(errp, "object type '%s' is abstract", typename);
 533         return NULL;
 534     }
 535     obj = object_new(typename);
 536
 537     if (object_set_propv(obj, &local_err, vargs) < 0) {
 538         goto error;
 539     }
 540
 541     object_property_add_child(parent, id, obj, &local_err);
 542     if (local_err) {
 543         goto error;
 544     }
 545
 546     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 547         user_creatable_complete(obj, &local_err);
 548         if (local_err) {
 549             object_unparent(obj);
 550             goto error;
 551         }
 552     }
 553
 554     object_unref(OBJECT(obj));
 555     return obj;
 556
 557  error:
 558     error_propagate(errp, local_err);
 559     object_unref(obj);
 560     return NULL;
 561 }
 562
 563
 564 int object_set_props(Object *obj,
 565                      Error **errp,
 566                      ...)
 567 {
 568     va_list vargs;
 569     int ret;
 570
 571     va_start(vargs, errp);
 572     ret = object_set_propv(obj, errp, vargs);
 573     va_end(vargs);
 574
 575     return ret;
 576 }
 577
 578
 579 int object_set_propv(Object *obj,
 580                      Error **errp,
 581                      va_list vargs)
 582 {
 583     const char *propname;
 584     Error *local_err = NULL;
 585
 586     propname = va_arg(vargs, char *);
 587     while (propname != NULL) {
 588         const char *value = va_arg(vargs, char *);
 589
 590         g_assert(value != NULL);
 591         object_property_parse(obj, value, propname, &local_err);
 592         if (local_err) {
 593             error_propagate(errp, local_err);
 594             return -1;
 595         }
 596         propname = va_arg(vargs, char *);
 597     }
 598
 599     return 0;
 600 }
 601
 602
 603 Object *object_dynamic_cast(Object *obj, const char *typename)
 604 {
 605     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 606         return obj;
 607     }
 608
 609     return NULL;
 610 }
 611
 612 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 613                                    const char *file, int line, const char *func)
 614 {
 615     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 616                                      typename, file, line, func);
 617
 618 #ifdef CONFIG_QOM_CAST_DEBUG
 619     int i;
 620     Object *inst;
 621
 622     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 623         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 624             goto out;
 625         }
 626     }
 627
 628     inst = object_dynamic_cast(obj, typename);
 629
 630     if (!inst && obj) {
 631         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 632                 file, line, func, obj, typename);
 633         abort();
 634     }
 635
 636     assert(obj == inst);
 637
 638     if (obj && obj == inst) {
 639         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 640             atomic_set(&obj->class->object_cast_cache[i - 1],
 641                        atomic_read(&obj->class->object_cast_cache[i]));
 642         }
 643         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 644     }
 645
 646 out:
 647 #endif
 648     return obj;
 649 }
 650
 651 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 652                                        const char *typename)
 653 {
 654     ObjectClass *ret = NULL;
 655     TypeImpl *target_type;
 656     TypeImpl *type;
 657
 658     if (!class) {
 659         return NULL;
 660     }
 661
 662     /* A simple fast path that can trigger a lot for leaf classes.  */
 663     type = class->type;
 664     if (type->name == typename) {
 665         return class;
 666     }
 667
 668     target_type = type_get_by_name(typename);
 669     if (!target_type) {
 670         /* target class type unknown, so fail the cast */
 671         return NULL;
 672     }
 673
 674     if (type->class->interfaces &&
 675             type_is_ancestor(target_type, type_interface)) {
 676         int found = 0;
 677         GSList *i;
 678
 679         for (i = class->interfaces; i; i = i->next) {
 680             ObjectClass *target_class = i->data;
 681
 682             if (type_is_ancestor(target_class->type, target_type)) {
 683                 ret = target_class;
 684                 found++;
 685             }
 686          }
 687
 688         /* The match was ambiguous, don't allow a cast */
 689         if (found > 1) {
 690             ret = NULL;
 691         }
 692     } else if (type_is_ancestor(type, target_type)) {
 693         ret = class;
 694     }
 695
 696     return ret;
 697 }
 698
 699 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 700                                               const char *typename,
 701                                               const char *file, int line,
 702                                               const char *func)
 703 {
 704     ObjectClass *ret;
 705
 706     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 707                                            typename, file, line, func);
 708
 709 #ifdef CONFIG_QOM_CAST_DEBUG
 710     int i;
 711
 712     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 713         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 714             ret = class;
 715             goto out;
 716         }
 717     }
 718 #else
 719     if (!class || !class->interfaces) {
 720         return class;
 721     }
 722 #endif
 723
 724     ret = object_class_dynamic_cast(class, typename);
 725     if (!ret && class) {
 726         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 727                 file, line, func, class, typename);
 728         abort();
 729     }
 730
 731 #ifdef CONFIG_QOM_CAST_DEBUG
 732     if (class && ret == class) {
 733         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 734             atomic_set(&class->class_cast_cache[i - 1],
 735                        atomic_read(&class->class_cast_cache[i]));
 736         }
 737         atomic_set(&class->class_cast_cache[i - 1], typename);
 738     }
 739 out:
 740 #endif
 741     return ret;
 742 }
 743
 744 const char *object_get_typename(Object *obj)
 745 {
 746     return obj->class->type->name;
 747 }
 748
 749 ObjectClass *object_get_class(Object *obj)
 750 {
 751     return obj->class;
 752 }
 753
 754 bool object_class_is_abstract(ObjectClass *klass)
 755 {
 756     return klass->type->abstract;
 757 }
 758
 759 const char *object_class_get_name(ObjectClass *klass)
 760 {
 761     return klass->type->name;
 762 }
 763
 764 ObjectClass *object_class_by_name(const char *typename)
 765 {
 766     TypeImpl *type = type_get_by_name(typename);
 767
 768     if (!type) {
 769         return NULL;
 770     }
 771
 772     type_initialize(type);
 773
 774     return type->class;
 775 }
 776
 777 ObjectClass *object_class_get_parent(ObjectClass *class)
 778 {
 779     TypeImpl *type = type_get_parent(class->type);
 780
 781     if (!type) {
 782         return NULL;
 783     }
 784
 785     type_initialize(type);
 786
 787     return type->class;
 788 }
 789
 790 typedef struct OCFData
 791 {
 792     void (*fn)(ObjectClass *klass, void *opaque);
 793     const char *implements_type;
 794     bool include_abstract;
 795     void *opaque;
 796 } OCFData;
 797
 798 static void object_class_foreach_tramp(gpointer key, gpointer value,
 799                                        gpointer opaque)
 800 {
 801     OCFData *data = opaque;
 802     TypeImpl *type = value;
 803     ObjectClass *k;
 804
 805     type_initialize(type);
 806     k = type->class;
 807
 808     if (!data->include_abstract && type->abstract) {
 809         return;
 810     }
 811
 812     if (data->implements_type &&
 813         !object_class_dynamic_cast(k, data->implements_type)) {
 814         return;
 815     }
 816
 817     data->fn(k, data->opaque);
 818 }
 819
 820 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 821                           const char *implements_type, bool include_abstract,
 822                           void *opaque)
 823 {
 824     OCFData data = { fn, implements_type, include_abstract, opaque };
 825
 826     enumerating_types = true;
 827     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 828     enumerating_types = false;
 829 }
 830
 831 static int do_object_child_foreach(Object *obj,
 832                                    int (*fn)(Object *child, void *opaque),
 833                                    void *opaque, bool recurse)
 834 {
 835     GHashTableIter iter;
 836     ObjectProperty *prop;
 837     int ret = 0;
 838
 839     g_hash_table_iter_init(&iter, obj->properties);
 840     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 841         if (object_property_is_child(prop)) {
 842             Object *child = prop->opaque;
 843
 844             ret = fn(child, opaque);
 845             if (ret != 0) {
 846                 break;
 847             }
 848             if (recurse) {
 849                 do_object_child_foreach(child, fn, opaque, true);
 850             }
 851         }
 852     }
 853     return ret;
 854 }
 855
 856 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 857                          void *opaque)
 858 {
 859     return do_object_child_foreach(obj, fn, opaque, false);
 860 }
 861
 862 int object_child_foreach_recursive(Object *obj,
 863                                    int (*fn)(Object *child, void *opaque),
 864                                    void *opaque)
 865 {
 866     return do_object_child_foreach(obj, fn, opaque, true);
 867 }
 868
 869 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 870 {
 871     GSList **list = opaque;
 872
 873     *list = g_slist_prepend(*list, klass);
 874 }
 875
 876 GSList *object_class_get_list(const char *implements_type,
 877                               bool include_abstract)
 878 {
 879     GSList *list = NULL;
 880
 881     object_class_foreach(object_class_get_list_tramp,
 882                          implements_type, include_abstract, &list);
 883     return list;
 884 }
 885
 886 void object_ref(Object *obj)
 887 {
 888     if (!obj) {
 889         return;
 890     }
 891     atomic_inc(&obj->ref);
 892 }
 893
 894 void object_unref(Object *obj)
 895 {
 896     if (!obj) {
 897         return;
 898     }
 899     g_assert_cmpint(obj->ref, >, 0);
 900
 901     /* parent always holds a reference to its children */
 902     if (atomic_fetch_dec(&obj->ref) == 1) {
 903         object_finalize(obj);
 904     }
 905 }
 906
 907 ObjectProperty *
 908 object_property_add(Object *obj, const char *name, const char *type,
 909                     ObjectPropertyAccessor *get,
 910                     ObjectPropertyAccessor *set,
 911                     ObjectPropertyRelease *release,
 912                     void *opaque, Error **errp)
 913 {
 914     ObjectProperty *prop;
 915     size_t name_len = strlen(name);
 916
 917     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 918         int i;
 919         ObjectProperty *ret;
 920         char *name_no_array = g_strdup(name);
 921
 922         name_no_array[name_len - 3] = '\0';
 923         for (i = 0; ; ++i) {
 924             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 925
 926             ret = object_property_add(obj, full_name, type, get, set,
 927                                       release, opaque, NULL);
 928             g_free(full_name);
 929             if (ret) {
 930                 break;
 931             }
 932         }
 933         g_free(name_no_array);
 934         return ret;
 935     }
 936
 937     if (object_property_find(obj, name, NULL) != NULL) {
 938         error_setg(errp, "attempt to add duplicate property '%s'"
 939                    " to object (type '%s')", name,
 940                    object_get_typename(obj));
 941         return NULL;
 942     }
 943
 944     prop = g_malloc0(sizeof(*prop));
 945
 946     prop->name = g_strdup(name);
 947     prop->type = g_strdup(type);
 948
 949     prop->get = get;
 950     prop->set = set;
 951     prop->release = release;
 952     prop->opaque = opaque;
 953
 954     g_hash_table_insert(obj->properties, prop->name, prop);
 955     return prop;
 956 }
 957
 958 ObjectProperty *
 959 object_class_property_add(ObjectClass *klass,
 960                           const char *name,
 961                           const char *type,
 962                           ObjectPropertyAccessor *get,
 963                           ObjectPropertyAccessor *set,
 964                           ObjectPropertyRelease *release,
 965                           void *opaque,
 966                           Error **errp)
 967 {
 968     ObjectProperty *prop;
 969
 970     if (object_class_property_find(klass, name, NULL) != NULL) {
 971         error_setg(errp, "attempt to add duplicate property '%s'"
 972                    " to object (type '%s')", name,
 973                    object_class_get_name(klass));
 974         return NULL;
 975     }
 976
 977     prop = g_malloc0(sizeof(*prop));
 978
 979     prop->name = g_strdup(name);
 980     prop->type = g_strdup(type);
 981
 982     prop->get = get;
 983     prop->set = set;
 984     prop->release = release;
 985     prop->opaque = opaque;
 986
 987     g_hash_table_insert(klass->properties, g_strdup(name), prop);
 988
 989     return prop;
 990 }
 991
 992 ObjectProperty *object_property_find(Object *obj, const char *name,
 993                                      Error **errp)
 994 {
 995     ObjectProperty *prop;
 996     ObjectClass *klass = object_get_class(obj);
 997
 998     prop = object_class_property_find(klass, name, NULL);
 999     if (prop) {
1000         return prop;
1001     }
1002
1003     prop = g_hash_table_lookup(obj->properties, name);
1004     if (prop) {
1005         return prop;
1006     }
1007
1008     error_setg(errp, "Property '.%s' not found", name);
1009     return NULL;
1010 }
1011
1012 void object_property_iter_init(ObjectPropertyIterator *iter,
1013                                Object *obj)
1014 {
1015     g_hash_table_iter_init(&iter->iter, obj->properties);
1016     iter->nextclass = object_get_class(obj);
1017 }
1018
1019 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1020 {
1021     gpointer key, val;
1022     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1023         if (!iter->nextclass) {
1024             return NULL;
1025         }
1026         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1027         iter->nextclass = object_class_get_parent(iter->nextclass);
1028     }
1029     return val;
1030 }
1031
1032 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1033                                            Error **errp)
1034 {
1035     ObjectProperty *prop;
1036     ObjectClass *parent_klass;
1037
1038     parent_klass = object_class_get_parent(klass);
1039     if (parent_klass) {
1040         prop = object_class_property_find(parent_klass, name, NULL);
1041         if (prop) {
1042             return prop;
1043         }
1044     }
1045
1046     prop = g_hash_table_lookup(klass->properties, name);
1047     if (!prop) {
1048         error_setg(errp, "Property '.%s' not found", name);
1049     }
1050     return prop;
1051 }
1052
1053 void object_property_del(Object *obj, const char *name, Error **errp)
1054 {
1055     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1056
1057     if (!prop) {
1058         error_setg(errp, "Property '.%s' not found", name);
1059         return;
1060     }
1061
1062     if (prop->release) {
1063         prop->release(obj, name, prop->opaque);
1064     }
1065     g_hash_table_remove(obj->properties, name);
1066 }
1067
1068 void object_property_get(Object *obj, Visitor *v, const char *name,
1069                          Error **errp)
1070 {
1071     ObjectProperty *prop = object_property_find(obj, name, errp);
1072     if (prop == NULL) {
1073         return;
1074     }
1075
1076     if (!prop->get) {
1077         error_setg(errp, QERR_PERMISSION_DENIED);
1078     } else {
1079         prop->get(obj, v, name, prop->opaque, errp);
1080     }
1081 }
1082
1083 void object_property_set(Object *obj, Visitor *v, const char *name,
1084                          Error **errp)
1085 {
1086     ObjectProperty *prop = object_property_find(obj, name, errp);
1087     if (prop == NULL) {
1088         return;
1089     }
1090
1091     if (!prop->set) {
1092         error_setg(errp, QERR_PERMISSION_DENIED);
1093     } else {
1094         prop->set(obj, v, name, prop->opaque, errp);
1095     }
1096 }
1097
1098 void object_property_set_str(Object *obj, const char *value,
1099                              const char *name, Error **errp)
1100 {
1101     QString *qstr = qstring_from_str(value);
1102     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1103
1104     QDECREF(qstr);
1105 }
1106
1107 char *object_property_get_str(Object *obj, const char *name,
1108                               Error **errp)
1109 {
1110     QObject *ret = object_property_get_qobject(obj, name, errp);
1111     QString *qstring;
1112     char *retval;
1113
1114     if (!ret) {
1115         return NULL;
1116     }
1117     qstring = qobject_to_qstring(ret);
1118     if (!qstring) {
1119         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1120         retval = NULL;
1121     } else {
1122         retval = g_strdup(qstring_get_str(qstring));
1123     }
1124
1125     QDECREF(qstring);
1126     return retval;
1127 }
1128
1129 void object_property_set_link(Object *obj, Object *value,
1130                               const char *name, Error **errp)
1131 {
1132     if (value) {
1133         gchar *path = object_get_canonical_path(value);
1134         object_property_set_str(obj, path, name, errp);
1135         g_free(path);
1136     } else {
1137         object_property_set_str(obj, "", name, errp);
1138     }
1139 }
1140
1141 Object *object_property_get_link(Object *obj, const char *name,
1142                                  Error **errp)
1143 {
1144     char *str = object_property_get_str(obj, name, errp);
1145     Object *target = NULL;
1146
1147     if (str && *str) {
1148         target = object_resolve_path(str, NULL);
1149         if (!target) {
1150             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1151                       "Device '%s' not found", str);
1152         }
1153     }
1154
1155     g_free(str);
1156     return target;
1157 }
1158
1159 void object_property_set_bool(Object *obj, bool value,
1160                               const char *name, Error **errp)
1161 {
1162     QBool *qbool = qbool_from_bool(value);
1163     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1164
1165     QDECREF(qbool);
1166 }
1167
1168 bool object_property_get_bool(Object *obj, const char *name,
1169                               Error **errp)
1170 {
1171     QObject *ret = object_property_get_qobject(obj, name, errp);
1172     QBool *qbool;
1173     bool retval;
1174
1175     if (!ret) {
1176         return false;
1177     }
1178     qbool = qobject_to_qbool(ret);
1179     if (!qbool) {
1180         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1181         retval = false;
1182     } else {
1183         retval = qbool_get_bool(qbool);
1184     }
1185
1186     QDECREF(qbool);
1187     return retval;
1188 }
1189
1190 void object_property_set_int(Object *obj, int64_t value,
1191                              const char *name, Error **errp)
1192 {
1193     QInt *qint = qint_from_int(value);
1194     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1195
1196     QDECREF(qint);
1197 }
1198
1199 int64_t object_property_get_int(Object *obj, const char *name,
1200                                 Error **errp)
1201 {
1202     QObject *ret = object_property_get_qobject(obj, name, errp);
1203     QInt *qint;
1204     int64_t retval;
1205
1206     if (!ret) {
1207         return -1;
1208     }
1209     qint = qobject_to_qint(ret);
1210     if (!qint) {
1211         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1212         retval = -1;
1213     } else {
1214         retval = qint_get_int(qint);
1215     }
1216
1217     QDECREF(qint);
1218     return retval;
1219 }
1220
1221 typedef struct EnumProperty {
1222     const char * const *strings;
1223     int (*get)(Object *, Error **);
1224     void (*set)(Object *, int, Error **);
1225 } EnumProperty;
1226
1227 int object_property_get_enum(Object *obj, const char *name,
1228                              const char *typename, Error **errp)
1229 {
1230     Error *err = NULL;
1231     Visitor *v;
1232     char *str;
1233     int ret;
1234     ObjectProperty *prop = object_property_find(obj, name, errp);
1235     EnumProperty *enumprop;
1236
1237     if (prop == NULL) {
1238         return 0;
1239     }
1240
1241     if (!g_str_equal(prop->type, typename)) {
1242         error_setg(errp, "Property %s on %s is not '%s' enum type",
1243                    name, object_class_get_name(
1244                        object_get_class(obj)), typename);
1245         return 0;
1246     }
1247
1248     enumprop = prop->opaque;
1249
1250     v = string_output_visitor_new(false, &str);
1251     object_property_get(obj, v, name, &err);
1252     if (err) {
1253         error_propagate(errp, err);
1254         visit_free(v);
1255         return 0;
1256     }
1257     visit_complete(v, &str);
1258     visit_free(v);
1259     v = string_input_visitor_new(str);
1260     visit_type_enum(v, name, &ret, enumprop->strings, errp);
1261
1262     g_free(str);
1263     visit_free(v);
1264
1265     return ret;
1266 }
1267
1268 void object_property_get_uint16List(Object *obj, const char *name,
1269                                     uint16List **list, Error **errp)
1270 {
1271     Error *err = NULL;
1272     Visitor *v;
1273     char *str;
1274
1275     v = string_output_visitor_new(false, &str);
1276     object_property_get(obj, v, name, &err);
1277     if (err) {
1278         error_propagate(errp, err);
1279         goto out;
1280     }
1281     visit_complete(v, &str);
1282     visit_free(v);
1283     v = string_input_visitor_new(str);
1284     visit_type_uint16List(v, NULL, list, errp);
1285
1286     g_free(str);
1287 out:
1288     visit_free(v);
1289 }
1290
1291 void object_property_parse(Object *obj, const char *string,
1292                            const char *name, Error **errp)
1293 {
1294     Visitor *v = string_input_visitor_new(string);
1295     object_property_set(obj, v, name, errp);
1296     visit_free(v);
1297 }
1298
1299 char *object_property_print(Object *obj, const char *name, bool human,
1300                             Error **errp)
1301 {
1302     Visitor *v;
1303     char *string = NULL;
1304     Error *local_err = NULL;
1305
1306     v = string_output_visitor_new(human, &string);
1307     object_property_get(obj, v, name, &local_err);
1308     if (local_err) {
1309         error_propagate(errp, local_err);
1310         goto out;
1311     }
1312
1313     visit_complete(v, &string);
1314
1315 out:
1316     visit_free(v);
1317     return string;
1318 }
1319
1320 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1321 {
1322     ObjectProperty *prop = object_property_find(obj, name, errp);
1323     if (prop == NULL) {
1324         return NULL;
1325     }
1326
1327     return prop->type;
1328 }
1329
1330 Object *object_get_root(void)
1331 {
1332     static Object *root;
1333
1334     if (!root) {
1335         root = object_new("container");
1336     }
1337
1338     return root;
1339 }
1340
1341 Object *object_get_objects_root(void)
1342 {
1343     return container_get(object_get_root(), "/objects");
1344 }
1345
1346 static void object_get_child_property(Object *obj, Visitor *v,
1347                                       const char *name, void *opaque,
1348                                       Error **errp)
1349 {
1350     Object *child = opaque;
1351     gchar *path;
1352
1353     path = object_get_canonical_path(child);
1354     visit_type_str(v, name, &path, errp);
1355     g_free(path);
1356 }
1357
1358 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1359 {
1360     return opaque;
1361 }
1362
1363 static void object_finalize_child_property(Object *obj, const char *name,
1364                                            void *opaque)
1365 {
1366     Object *child = opaque;
1367
1368     if (child->class->unparent) {
1369         (child->class->unparent)(child);
1370     }
1371     child->parent = NULL;
1372     object_unref(child);
1373 }
1374
1375 void object_property_add_child(Object *obj, const char *name,
1376                                Object *child, Error **errp)
1377 {
1378     Error *local_err = NULL;
1379     gchar *type;
1380     ObjectProperty *op;
1381
1382     if (child->parent != NULL) {
1383         error_setg(errp, "child object is already parented");
1384         return;
1385     }
1386
1387     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1388
1389     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1390                              object_finalize_child_property, child, &local_err);
1391     if (local_err) {
1392         error_propagate(errp, local_err);
1393         goto out;
1394     }
1395
1396     op->resolve = object_resolve_child_property;
1397     object_ref(child);
1398     child->parent = obj;
1399
1400 out:
1401     g_free(type);
1402 }
1403
1404 void object_property_allow_set_link(Object *obj, const char *name,
1405                                     Object *val, Error **errp)
1406 {
1407     /* Allow the link to be set, always */
1408 }
1409
1410 typedef struct {
1411     Object **child;
1412     void (*check)(Object *, const char *, Object *, Error **);
1413     ObjectPropertyLinkFlags flags;
1414 } LinkProperty;
1415
1416 static void object_get_link_property(Object *obj, Visitor *v,
1417                                      const char *name, void *opaque,
1418                                      Error **errp)
1419 {
1420     LinkProperty *lprop = opaque;
1421     Object **child = lprop->child;
1422     gchar *path;
1423
1424     if (*child) {
1425         path = object_get_canonical_path(*child);
1426         visit_type_str(v, name, &path, errp);
1427         g_free(path);
1428     } else {
1429         path = (gchar *)"";
1430         visit_type_str(v, name, &path, errp);
1431     }
1432 }
1433
1434 /*
1435  * object_resolve_link:
1436  *
1437  * Lookup an object and ensure its type matches the link property type.  This
1438  * is similar to object_resolve_path() except type verification against the
1439  * link property is performed.
1440  *
1441  * Returns: The matched object or NULL on path lookup failures.
1442  */
1443 static Object *object_resolve_link(Object *obj, const char *name,
1444                                    const char *path, Error **errp)
1445 {
1446     const char *type;
1447     gchar *target_type;
1448     bool ambiguous = false;
1449     Object *target;
1450
1451     /* Go from link<FOO> to FOO.  */
1452     type = object_property_get_type(obj, name, NULL);
1453     target_type = g_strndup(&type[5], strlen(type) - 6);
1454     target = object_resolve_path_type(path, target_type, &ambiguous);
1455
1456     if (ambiguous) {
1457         error_setg(errp, "Path '%s' does not uniquely identify an object",
1458                    path);
1459     } else if (!target) {
1460         target = object_resolve_path(path, &ambiguous);
1461         if (target || ambiguous) {
1462             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1463         } else {
1464             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1465                       "Device '%s' not found", path);
1466         }
1467         target = NULL;
1468     }
1469     g_free(target_type);
1470
1471     return target;
1472 }
1473
1474 static void object_set_link_property(Object *obj, Visitor *v,
1475                                      const char *name, void *opaque,
1476                                      Error **errp)
1477 {
1478     Error *local_err = NULL;
1479     LinkProperty *prop = opaque;
1480     Object **child = prop->child;
1481     Object *old_target = *child;
1482     Object *new_target = NULL;
1483     char *path = NULL;
1484
1485     visit_type_str(v, name, &path, &local_err);
1486
1487     if (!local_err && strcmp(path, "") != 0) {
1488         new_target = object_resolve_link(obj, name, path, &local_err);
1489     }
1490
1491     g_free(path);
1492     if (local_err) {
1493         error_propagate(errp, local_err);
1494         return;
1495     }
1496
1497     prop->check(obj, name, new_target, &local_err);
1498     if (local_err) {
1499         error_propagate(errp, local_err);
1500         return;
1501     }
1502
1503     object_ref(new_target);
1504     *child = new_target;
1505     object_unref(old_target);
1506 }
1507
1508 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1509 {
1510     LinkProperty *lprop = opaque;
1511
1512     return *lprop->child;
1513 }
1514
1515 static void object_release_link_property(Object *obj, const char *name,
1516                                          void *opaque)
1517 {
1518     LinkProperty *prop = opaque;
1519
1520     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1521         object_unref(*prop->child);
1522     }
1523     g_free(prop);
1524 }
1525
1526 void object_property_add_link(Object *obj, const char *name,
1527                               const char *type, Object **child,
1528                               void (*check)(Object *, const char *,
1529                                             Object *, Error **),
1530                               ObjectPropertyLinkFlags flags,
1531                               Error **errp)
1532 {
1533     Error *local_err = NULL;
1534     LinkProperty *prop = g_malloc(sizeof(*prop));
1535     gchar *full_type;
1536     ObjectProperty *op;
1537
1538     prop->child = child;
1539     prop->check = check;
1540     prop->flags = flags;
1541
1542     full_type = g_strdup_printf("link<%s>", type);
1543
1544     op = object_property_add(obj, name, full_type,
1545                              object_get_link_property,
1546                              check ? object_set_link_property : NULL,
1547                              object_release_link_property,
1548                              prop,
1549                              &local_err);
1550     if (local_err) {
1551         error_propagate(errp, local_err);
1552         g_free(prop);
1553         goto out;
1554     }
1555
1556     op->resolve = object_resolve_link_property;
1557
1558 out:
1559     g_free(full_type);
1560 }
1561
1562 void object_property_add_const_link(Object *obj, const char *name,
1563                                     Object *target, Error **errp)
1564 {
1565     char *link_type;
1566     ObjectProperty *op;
1567
1568     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1569     op = object_property_add(obj, name, link_type,
1570                              object_get_child_property, NULL,
1571                              NULL, target, errp);
1572     if (op != NULL) {
1573         op->resolve = object_resolve_child_property;
1574     }
1575     g_free(link_type);
1576 }
1577
1578 gchar *object_get_canonical_path_component(Object *obj)
1579 {
1580     ObjectProperty *prop = NULL;
1581     GHashTableIter iter;
1582
1583     g_assert(obj);
1584     g_assert(obj->parent != NULL);
1585
1586     g_hash_table_iter_init(&iter, obj->parent->properties);
1587     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1588         if (!object_property_is_child(prop)) {
1589             continue;
1590         }
1591
1592         if (prop->opaque == obj) {
1593             return g_strdup(prop->name);
1594         }
1595     }
1596
1597     /* obj had a parent but was not a child, should never happen */
1598     g_assert_not_reached();
1599     return NULL;
1600 }
1601
1602 gchar *object_get_canonical_path(Object *obj)
1603 {
1604     Object *root = object_get_root();
1605     char *newpath, *path = NULL;
1606
1607     while (obj != root) {
1608         char *component = object_get_canonical_path_component(obj);
1609
1610         if (path) {
1611             newpath = g_strdup_printf("%s/%s", component, path);
1612             g_free(component);
1613             g_free(path);
1614             path = newpath;
1615         } else {
1616             path = component;
1617         }
1618
1619         obj = obj->parent;
1620     }
1621
1622     newpath = g_strdup_printf("/%s", path ? path : "");
1623     g_free(path);
1624
1625     return newpath;
1626 }
1627
1628 Object *object_resolve_path_component(Object *parent, const gchar *part)
1629 {
1630     ObjectProperty *prop = object_property_find(parent, part, NULL);
1631     if (prop == NULL) {
1632         return NULL;
1633     }
1634
1635     if (prop->resolve) {
1636         return prop->resolve(parent, prop->opaque, part);
1637     } else {
1638         return NULL;
1639     }
1640 }
1641
1642 static Object *object_resolve_abs_path(Object *parent,
1643                                           gchar **parts,
1644                                           const char *typename,
1645                                           int index)
1646 {
1647     Object *child;
1648
1649     if (parts[index] == NULL) {
1650         return object_dynamic_cast(parent, typename);
1651     }
1652
1653     if (strcmp(parts[index], "") == 0) {
1654         return object_resolve_abs_path(parent, parts, typename, index + 1);
1655     }
1656
1657     child = object_resolve_path_component(parent, parts[index]);
1658     if (!child) {
1659         return NULL;
1660     }
1661
1662     return object_resolve_abs_path(child, parts, typename, index + 1);
1663 }
1664
1665 static Object *object_resolve_partial_path(Object *parent,
1666                                               gchar **parts,
1667                                               const char *typename,
1668                                               bool *ambiguous)
1669 {
1670     Object *obj;
1671     GHashTableIter iter;
1672     ObjectProperty *prop;
1673
1674     obj = object_resolve_abs_path(parent, parts, typename, 0);
1675
1676     g_hash_table_iter_init(&iter, parent->properties);
1677     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1678         Object *found;
1679
1680         if (!object_property_is_child(prop)) {
1681             continue;
1682         }
1683
1684         found = object_resolve_partial_path(prop->opaque, parts,
1685                                             typename, ambiguous);
1686         if (found) {
1687             if (obj) {
1688                 if (ambiguous) {
1689                     *ambiguous = true;
1690                 }
1691                 return NULL;
1692             }
1693             obj = found;
1694         }
1695
1696         if (ambiguous && *ambiguous) {
1697             return NULL;
1698         }
1699     }
1700
1701     return obj;
1702 }
1703
1704 Object *object_resolve_path_type(const char *path, const char *typename,
1705                                  bool *ambiguous)
1706 {
1707     Object *obj;
1708     gchar **parts;
1709
1710     parts = g_strsplit(path, "/", 0);
1711     assert(parts);
1712
1713     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1714         if (ambiguous) {
1715             *ambiguous = false;
1716         }
1717         obj = object_resolve_partial_path(object_get_root(), parts,
1718                                           typename, ambiguous);
1719     } else {
1720         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1721     }
1722
1723     g_strfreev(parts);
1724
1725     return obj;
1726 }
1727
1728 Object *object_resolve_path(const char *path, bool *ambiguous)
1729 {
1730     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1731 }
1732
1733 typedef struct StringProperty
1734 {
1735     char *(*get)(Object *, Error **);
1736     void (*set)(Object *, const char *, Error **);
1737 } StringProperty;
1738
1739 static void property_get_str(Object *obj, Visitor *v, const char *name,
1740                              void *opaque, Error **errp)
1741 {
1742     StringProperty *prop = opaque;
1743     char *value;
1744     Error *err = NULL;
1745
1746     value = prop->get(obj, &err);
1747     if (err) {
1748         error_propagate(errp, err);
1749         return;
1750     }
1751
1752     visit_type_str(v, name, &value, errp);
1753     g_free(value);
1754 }
1755
1756 static void property_set_str(Object *obj, Visitor *v, const char *name,
1757                              void *opaque, Error **errp)
1758 {
1759     StringProperty *prop = opaque;
1760     char *value;
1761     Error *local_err = NULL;
1762
1763     visit_type_str(v, name, &value, &local_err);
1764     if (local_err) {
1765         error_propagate(errp, local_err);
1766         return;
1767     }
1768
1769     prop->set(obj, value, errp);
1770     g_free(value);
1771 }
1772
1773 static void property_release_str(Object *obj, const char *name,
1774                                  void *opaque)
1775 {
1776     StringProperty *prop = opaque;
1777     g_free(prop);
1778 }
1779
1780 void object_property_add_str(Object *obj, const char *name,
1781                            char *(*get)(Object *, Error **),
1782                            void (*set)(Object *, const char *, Error **),
1783                            Error **errp)
1784 {
1785     Error *local_err = NULL;
1786     StringProperty *prop = g_malloc0(sizeof(*prop));
1787
1788     prop->get = get;
1789     prop->set = set;
1790
1791     object_property_add(obj, name, "string",
1792                         get ? property_get_str : NULL,
1793                         set ? property_set_str : NULL,
1794                         property_release_str,
1795                         prop, &local_err);
1796     if (local_err) {
1797         error_propagate(errp, local_err);
1798         g_free(prop);
1799     }
1800 }
1801
1802 void object_class_property_add_str(ObjectClass *klass, const char *name,
1803                                    char *(*get)(Object *, Error **),
1804                                    void (*set)(Object *, const char *,
1805                                                Error **),
1806                                    Error **errp)
1807 {
1808     Error *local_err = NULL;
1809     StringProperty *prop = g_malloc0(sizeof(*prop));
1810
1811     prop->get = get;
1812     prop->set = set;
1813
1814     object_class_property_add(klass, name, "string",
1815                               get ? property_get_str : NULL,
1816                               set ? property_set_str : NULL,
1817                               property_release_str,
1818                               prop, &local_err);
1819     if (local_err) {
1820         error_propagate(errp, local_err);
1821         g_free(prop);
1822     }
1823 }
1824
1825 typedef struct BoolProperty
1826 {
1827     bool (*get)(Object *, Error **);
1828     void (*set)(Object *, bool, Error **);
1829 } BoolProperty;
1830
1831 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1832                               void *opaque, Error **errp)
1833 {
1834     BoolProperty *prop = opaque;
1835     bool value;
1836     Error *err = NULL;
1837
1838     value = prop->get(obj, &err);
1839     if (err) {
1840         error_propagate(errp, err);
1841         return;
1842     }
1843
1844     visit_type_bool(v, name, &value, errp);
1845 }
1846
1847 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1848                               void *opaque, Error **errp)
1849 {
1850     BoolProperty *prop = opaque;
1851     bool value;
1852     Error *local_err = NULL;
1853
1854     visit_type_bool(v, name, &value, &local_err);
1855     if (local_err) {
1856         error_propagate(errp, local_err);
1857         return;
1858     }
1859
1860     prop->set(obj, value, errp);
1861 }
1862
1863 static void property_release_bool(Object *obj, const char *name,
1864                                   void *opaque)
1865 {
1866     BoolProperty *prop = opaque;
1867     g_free(prop);
1868 }
1869
1870 void object_property_add_bool(Object *obj, const char *name,
1871                               bool (*get)(Object *, Error **),
1872                               void (*set)(Object *, bool, Error **),
1873                               Error **errp)
1874 {
1875     Error *local_err = NULL;
1876     BoolProperty *prop = g_malloc0(sizeof(*prop));
1877
1878     prop->get = get;
1879     prop->set = set;
1880
1881     object_property_add(obj, name, "bool",
1882                         get ? property_get_bool : NULL,
1883                         set ? property_set_bool : NULL,
1884                         property_release_bool,
1885                         prop, &local_err);
1886     if (local_err) {
1887         error_propagate(errp, local_err);
1888         g_free(prop);
1889     }
1890 }
1891
1892 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1893                                     bool (*get)(Object *, Error **),
1894                                     void (*set)(Object *, bool, Error **),
1895                                     Error **errp)
1896 {
1897     Error *local_err = NULL;
1898     BoolProperty *prop = g_malloc0(sizeof(*prop));
1899
1900     prop->get = get;
1901     prop->set = set;
1902
1903     object_class_property_add(klass, name, "bool",
1904                               get ? property_get_bool : NULL,
1905                               set ? property_set_bool : NULL,
1906                               property_release_bool,
1907                               prop, &local_err);
1908     if (local_err) {
1909         error_propagate(errp, local_err);
1910         g_free(prop);
1911     }
1912 }
1913
1914 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1915                               void *opaque, Error **errp)
1916 {
1917     EnumProperty *prop = opaque;
1918     int value;
1919     Error *err = NULL;
1920
1921     value = prop->get(obj, &err);
1922     if (err) {
1923         error_propagate(errp, err);
1924         return;
1925     }
1926
1927     visit_type_enum(v, name, &value, prop->strings, errp);
1928 }
1929
1930 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1931                               void *opaque, Error **errp)
1932 {
1933     EnumProperty *prop = opaque;
1934     int value;
1935     Error *err = NULL;
1936
1937     visit_type_enum(v, name, &value, prop->strings, &err);
1938     if (err) {
1939         error_propagate(errp, err);
1940         return;
1941     }
1942     prop->set(obj, value, errp);
1943 }
1944
1945 static void property_release_enum(Object *obj, const char *name,
1946                                   void *opaque)
1947 {
1948     EnumProperty *prop = opaque;
1949     g_free(prop);
1950 }
1951
1952 void object_property_add_enum(Object *obj, const char *name,
1953                               const char *typename,
1954                               const char * const *strings,
1955                               int (*get)(Object *, Error **),
1956                               void (*set)(Object *, int, Error **),
1957                               Error **errp)
1958 {
1959     Error *local_err = NULL;
1960     EnumProperty *prop = g_malloc(sizeof(*prop));
1961
1962     prop->strings = strings;
1963     prop->get = get;
1964     prop->set = set;
1965
1966     object_property_add(obj, name, typename,
1967                         get ? property_get_enum : NULL,
1968                         set ? property_set_enum : NULL,
1969                         property_release_enum,
1970                         prop, &local_err);
1971     if (local_err) {
1972         error_propagate(errp, local_err);
1973         g_free(prop);
1974     }
1975 }
1976
1977 void object_class_property_add_enum(ObjectClass *klass, const char *name,
1978                                     const char *typename,
1979                                     const char * const *strings,
1980                                     int (*get)(Object *, Error **),
1981                                     void (*set)(Object *, int, Error **),
1982                                     Error **errp)
1983 {
1984     Error *local_err = NULL;
1985     EnumProperty *prop = g_malloc(sizeof(*prop));
1986
1987     prop->strings = strings;
1988     prop->get = get;
1989     prop->set = set;
1990
1991     object_class_property_add(klass, name, typename,
1992                               get ? property_get_enum : NULL,
1993                               set ? property_set_enum : NULL,
1994                               property_release_enum,
1995                               prop, &local_err);
1996     if (local_err) {
1997         error_propagate(errp, local_err);
1998         g_free(prop);
1999     }
2000 }
2001
2002 typedef struct TMProperty {
2003     void (*get)(Object *, struct tm *, Error **);
2004 } TMProperty;
2005
2006 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2007                             void *opaque, Error **errp)
2008 {
2009     TMProperty *prop = opaque;
2010     Error *err = NULL;
2011     struct tm value;
2012
2013     prop->get(obj, &value, &err);
2014     if (err) {
2015         goto out;
2016     }
2017
2018     visit_start_struct(v, name, NULL, 0, &err);
2019     if (err) {
2020         goto out;
2021     }
2022     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2023     if (err) {
2024         goto out_end;
2025     }
2026     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2027     if (err) {
2028         goto out_end;
2029     }
2030     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2031     if (err) {
2032         goto out_end;
2033     }
2034     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2035     if (err) {
2036         goto out_end;
2037     }
2038     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2039     if (err) {
2040         goto out_end;
2041     }
2042     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2043     if (err) {
2044         goto out_end;
2045     }
2046     visit_check_struct(v, &err);
2047 out_end:
2048     visit_end_struct(v, NULL);
2049 out:
2050     error_propagate(errp, err);
2051
2052 }
2053
2054 static void property_release_tm(Object *obj, const char *name,
2055                                 void *opaque)
2056 {
2057     TMProperty *prop = opaque;
2058     g_free(prop);
2059 }
2060
2061 void object_property_add_tm(Object *obj, const char *name,
2062                             void (*get)(Object *, struct tm *, Error **),
2063                             Error **errp)
2064 {
2065     Error *local_err = NULL;
2066     TMProperty *prop = g_malloc0(sizeof(*prop));
2067
2068     prop->get = get;
2069
2070     object_property_add(obj, name, "struct tm",
2071                         get ? property_get_tm : NULL, NULL,
2072                         property_release_tm,
2073                         prop, &local_err);
2074     if (local_err) {
2075         error_propagate(errp, local_err);
2076         g_free(prop);
2077     }
2078 }
2079
2080 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2081                                   void (*get)(Object *, struct tm *, Error **),
2082                                   Error **errp)
2083 {
2084     Error *local_err = NULL;
2085     TMProperty *prop = g_malloc0(sizeof(*prop));
2086
2087     prop->get = get;
2088
2089     object_class_property_add(klass, name, "struct tm",
2090                               get ? property_get_tm : NULL, NULL,
2091                               property_release_tm,
2092                               prop, &local_err);
2093     if (local_err) {
2094         error_propagate(errp, local_err);
2095         g_free(prop);
2096     }
2097 }
2098
2099 static char *qdev_get_type(Object *obj, Error **errp)
2100 {
2101     return g_strdup(object_get_typename(obj));
2102 }
2103
2104 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2105                                    void *opaque, Error **errp)
2106 {
2107     uint8_t value = *(uint8_t *)opaque;
2108     visit_type_uint8(v, name, &value, errp);
2109 }
2110
2111 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2112                                     void *opaque, Error **errp)
2113 {
2114     uint16_t value = *(uint16_t *)opaque;
2115     visit_type_uint16(v, name, &value, errp);
2116 }
2117
2118 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2119                                     void *opaque, Error **errp)
2120 {
2121     uint32_t value = *(uint32_t *)opaque;
2122     visit_type_uint32(v, name, &value, errp);
2123 }
2124
2125 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2126                                     void *opaque, Error **errp)
2127 {
2128     uint64_t value = *(uint64_t *)opaque;
2129     visit_type_uint64(v, name, &value, errp);
2130 }
2131
2132 void object_property_add_uint8_ptr(Object *obj, const char *name,
2133                                    const uint8_t *v, Error **errp)
2134 {
2135     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2136                         NULL, NULL, (void *)v, errp);
2137 }
2138
2139 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2140                                          const uint8_t *v, Error **errp)
2141 {
2142     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2143                               NULL, NULL, (void *)v, errp);
2144 }
2145
2146 void object_property_add_uint16_ptr(Object *obj, const char *name,
2147                                     const uint16_t *v, Error **errp)
2148 {
2149     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2150                         NULL, NULL, (void *)v, errp);
2151 }
2152
2153 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2154                                           const uint16_t *v, Error **errp)
2155 {
2156     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2157                               NULL, NULL, (void *)v, errp);
2158 }
2159
2160 void object_property_add_uint32_ptr(Object *obj, const char *name,
2161                                     const uint32_t *v, Error **errp)
2162 {
2163     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2164                         NULL, NULL, (void *)v, errp);
2165 }
2166
2167 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2168                                           const uint32_t *v, Error **errp)
2169 {
2170     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2171                               NULL, NULL, (void *)v, errp);
2172 }
2173
2174 void object_property_add_uint64_ptr(Object *obj, const char *name,
2175                                     const uint64_t *v, Error **errp)
2176 {
2177     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2178                         NULL, NULL, (void *)v, errp);
2179 }
2180
2181 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2182                                           const uint64_t *v, Error **errp)
2183 {
2184     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2185                               NULL, NULL, (void *)v, errp);
2186 }
2187
2188 typedef struct {
2189     Object *target_obj;
2190     char *target_name;
2191 } AliasProperty;
2192
2193 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2194                                void *opaque, Error **errp)
2195 {
2196     AliasProperty *prop = opaque;
2197
2198     object_property_get(prop->target_obj, v, prop->target_name, errp);
2199 }
2200
2201 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2202                                void *opaque, Error **errp)
2203 {
2204     AliasProperty *prop = opaque;
2205
2206     object_property_set(prop->target_obj, v, prop->target_name, errp);
2207 }
2208
2209 static Object *property_resolve_alias(Object *obj, void *opaque,
2210                                       const gchar *part)
2211 {
2212     AliasProperty *prop = opaque;
2213
2214     return object_resolve_path_component(prop->target_obj, prop->target_name);
2215 }
2216
2217 static void property_release_alias(Object *obj, const char *name, void *opaque)
2218 {
2219     AliasProperty *prop = opaque;
2220
2221     g_free(prop->target_name);
2222     g_free(prop);
2223 }
2224
2225 void object_property_add_alias(Object *obj, const char *name,
2226                                Object *target_obj, const char *target_name,
2227                                Error **errp)
2228 {
2229     AliasProperty *prop;
2230     ObjectProperty *op;
2231     ObjectProperty *target_prop;
2232     gchar *prop_type;
2233     Error *local_err = NULL;
2234
2235     target_prop = object_property_find(target_obj, target_name, errp);
2236     if (!target_prop) {
2237         return;
2238     }
2239
2240     if (object_property_is_child(target_prop)) {
2241         prop_type = g_strdup_printf("link%s",
2242                                     target_prop->type + strlen("child"));
2243     } else {
2244         prop_type = g_strdup(target_prop->type);
2245     }
2246
2247     prop = g_malloc(sizeof(*prop));
2248     prop->target_obj = target_obj;
2249     prop->target_name = g_strdup(target_name);
2250
2251     op = object_property_add(obj, name, prop_type,
2252                              property_get_alias,
2253                              property_set_alias,
2254                              property_release_alias,
2255                              prop, &local_err);
2256     if (local_err) {
2257         error_propagate(errp, local_err);
2258         g_free(prop);
2259         goto out;
2260     }
2261     op->resolve = property_resolve_alias;
2262
2263     object_property_set_description(obj, op->name,
2264                                     target_prop->description,
2265                                     &error_abort);
2266
2267 out:
2268     g_free(prop_type);
2269 }
2270
2271 void object_property_set_description(Object *obj, const char *name,
2272                                      const char *description, Error **errp)
2273 {
2274     ObjectProperty *op;
2275
2276     op = object_property_find(obj, name, errp);
2277     if (!op) {
2278         return;
2279     }
2280
2281     g_free(op->description);
2282     op->description = g_strdup(description);
2283 }
2284
2285 void object_class_property_set_description(ObjectClass *klass,
2286                                            const char *name,
2287                                            const char *description,
2288                                            Error **errp)
2289 {
2290     ObjectProperty *op;
2291
2292     op = g_hash_table_lookup(klass->properties, name);
2293     if (!op) {
2294         error_setg(errp, "Property '.%s' not found", name);
2295         return;
2296     }
2297
2298     g_free(op->description);
2299     op->description = g_strdup(description);
2300 }
2301
2302 static void object_instance_init(Object *obj)
2303 {
2304     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2305 }
2306
2307 static void register_types(void)
2308 {
2309     static TypeInfo interface_info = {
2310         .name = TYPE_INTERFACE,
2311         .class_size = sizeof(InterfaceClass),
2312         .abstract = true,
2313     };
2314
2315     static TypeInfo object_info = {
2316         .name = TYPE_OBJECT,
2317         .instance_size = sizeof(Object),
2318         .instance_init = object_instance_init,
2319         .abstract = true,
2320     };
2321
2322     type_interface = type_register_internal(&interface_info);
2323     type_register_internal(&object_info);
2324 }
2325
2326 type_init(register_types)