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/string-input-visitor.h"
  20 #include "qapi/string-output-visitor.h"
  21 #include "qapi/qapi-builtin-visit.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/qbool.h"
  29 #include "qapi/qmp/qnum.h"
  30 #include "qapi/qmp/qstring.h"
  31
  32 #define MAX_INTERFACES 32
  33
  34 typedef struct InterfaceImpl InterfaceImpl;
  35 typedef struct TypeImpl TypeImpl;
  36
  37 struct InterfaceImpl
  38 {
  39     const char *typename;
  40 };
  41
  42 struct TypeImpl
  43 {
  44     const char *name;
  45
  46     size_t class_size;
  47
  48     size_t instance_size;
  49
  50     void (*class_init)(ObjectClass *klass, void *data);
  51     void (*class_base_init)(ObjectClass *klass, void *data);
  52     void (*class_finalize)(ObjectClass *klass, void *data);
  53
  54     void *class_data;
  55
  56     void (*instance_init)(Object *obj);
  57     void (*instance_post_init)(Object *obj);
  58     void (*instance_finalize)(Object *obj);
  59
  60     bool abstract;
  61
  62     const char *parent;
  63     TypeImpl *parent_type;
  64
  65     ObjectClass *class;
  66
  67     int num_interfaces;
  68     InterfaceImpl interfaces[MAX_INTERFACES];
  69 };
  70
  71 static Type type_interface;
  72
  73 static GHashTable *type_table_get(void)
  74 {
  75     static GHashTable *type_table;
  76
  77     if (type_table == NULL) {
  78         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  79     }
  80
  81     return type_table;
  82 }
  83
  84 static bool enumerating_types;
  85
  86 static void type_table_add(TypeImpl *ti)
  87 {
  88     assert(!enumerating_types);
  89     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  90 }
  91
  92 static TypeImpl *type_table_lookup(const char *name)
  93 {
  94     return g_hash_table_lookup(type_table_get(), name);
  95 }
  96
  97 static TypeImpl *type_new(const TypeInfo *info)
  98 {
  99     TypeImpl *ti = g_malloc0(sizeof(*ti));
 100     int i;
 101
 102     g_assert(info->name != NULL);
 103
 104     if (type_table_lookup(info->name) != NULL) {
 105         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 106         abort();
 107     }
 108
 109     ti->name = g_strdup(info->name);
 110     ti->parent = g_strdup(info->parent);
 111
 112     ti->class_size = info->class_size;
 113     ti->instance_size = info->instance_size;
 114
 115     ti->class_init = info->class_init;
 116     ti->class_base_init = info->class_base_init;
 117     ti->class_finalize = info->class_finalize;
 118     ti->class_data = info->class_data;
 119
 120     ti->instance_init = info->instance_init;
 121     ti->instance_post_init = info->instance_post_init;
 122     ti->instance_finalize = info->instance_finalize;
 123
 124     ti->abstract = info->abstract;
 125
 126     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 127         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 128     }
 129     ti->num_interfaces = i;
 130
 131     return ti;
 132 }
 133
 134 static TypeImpl *type_register_internal(const TypeInfo *info)
 135 {
 136     TypeImpl *ti;
 137     ti = type_new(info);
 138
 139     type_table_add(ti);
 140     return ti;
 141 }
 142
 143 TypeImpl *type_register(const TypeInfo *info)
 144 {
 145     assert(info->parent);
 146     return type_register_internal(info);
 147 }
 148
 149 TypeImpl *type_register_static(const TypeInfo *info)
 150 {
 151     return type_register(info);
 152 }
 153
 154 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 155 {
 156     int i;
 157
 158     for (i = 0; i < nr_infos; i++) {
 159         type_register_static(&infos[i]);
 160     }
 161 }
 162
 163 static TypeImpl *type_get_by_name(const char *name)
 164 {
 165     if (name == NULL) {
 166         return NULL;
 167     }
 168
 169     return type_table_lookup(name);
 170 }
 171
 172 static TypeImpl *type_get_parent(TypeImpl *type)
 173 {
 174     if (!type->parent_type && type->parent) {
 175         type->parent_type = type_get_by_name(type->parent);
 176         g_assert(type->parent_type != NULL);
 177     }
 178
 179     return type->parent_type;
 180 }
 181
 182 static bool type_has_parent(TypeImpl *type)
 183 {
 184     return (type->parent != NULL);
 185 }
 186
 187 static size_t type_class_get_size(TypeImpl *ti)
 188 {
 189     if (ti->class_size) {
 190         return ti->class_size;
 191     }
 192
 193     if (type_has_parent(ti)) {
 194         return type_class_get_size(type_get_parent(ti));
 195     }
 196
 197     return sizeof(ObjectClass);
 198 }
 199
 200 static size_t type_object_get_size(TypeImpl *ti)
 201 {
 202     if (ti->instance_size) {
 203         return ti->instance_size;
 204     }
 205
 206     if (type_has_parent(ti)) {
 207         return type_object_get_size(type_get_parent(ti));
 208     }
 209
 210     return 0;
 211 }
 212
 213 size_t object_type_get_instance_size(const char *typename)
 214 {
 215     TypeImpl *type = type_get_by_name(typename);
 216
 217     g_assert(type != NULL);
 218     return type_object_get_size(type);
 219 }
 220
 221 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 222 {
 223     assert(target_type);
 224
 225     /* Check if target_type is a direct ancestor of type */
 226     while (type) {
 227         if (type == target_type) {
 228             return true;
 229         }
 230
 231         type = type_get_parent(type);
 232     }
 233
 234     return false;
 235 }
 236
 237 static void type_initialize(TypeImpl *ti);
 238
 239 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 240                                       TypeImpl *parent_type)
 241 {
 242     InterfaceClass *new_iface;
 243     TypeInfo info = { };
 244     TypeImpl *iface_impl;
 245
 246     info.parent = parent_type->name;
 247     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 248     info.abstract = true;
 249
 250     iface_impl = type_new(&info);
 251     iface_impl->parent_type = parent_type;
 252     type_initialize(iface_impl);
 253     g_free((char *)info.name);
 254
 255     new_iface = (InterfaceClass *)iface_impl->class;
 256     new_iface->concrete_class = ti->class;
 257     new_iface->interface_type = interface_type;
 258
 259     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 260                                            iface_impl->class);
 261 }
 262
 263 static void object_property_free(gpointer data)
 264 {
 265     ObjectProperty *prop = data;
 266
 267     g_free(prop->name);
 268     g_free(prop->type);
 269     g_free(prop->description);
 270     g_free(prop);
 271 }
 272
 273 static void type_initialize(TypeImpl *ti)
 274 {
 275     TypeImpl *parent;
 276
 277     if (ti->class) {
 278         return;
 279     }
 280
 281     ti->class_size = type_class_get_size(ti);
 282     ti->instance_size = type_object_get_size(ti);
 283     /* Any type with zero instance_size is implicitly abstract.
 284      * This means interface types are all abstract.
 285      */
 286     if (ti->instance_size == 0) {
 287         ti->abstract = true;
 288     }
 289
 290     ti->class = g_malloc0(ti->class_size);
 291
 292     parent = type_get_parent(ti);
 293     if (parent) {
 294         type_initialize(parent);
 295         GSList *e;
 296         int i;
 297
 298         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 299         memcpy(ti->class, parent->class, parent->class_size);
 300         ti->class->interfaces = NULL;
 301         ti->class->properties = g_hash_table_new_full(
 302             g_str_hash, g_str_equal, g_free, object_property_free);
 303
 304         for (e = parent->class->interfaces; e; e = e->next) {
 305             InterfaceClass *iface = e->data;
 306             ObjectClass *klass = OBJECT_CLASS(iface);
 307
 308             type_initialize_interface(ti, iface->interface_type, klass->type);
 309         }
 310
 311         for (i = 0; i < ti->num_interfaces; i++) {
 312             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 313             for (e = ti->class->interfaces; e; e = e->next) {
 314                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 315
 316                 if (type_is_ancestor(target_type, t)) {
 317                     break;
 318                 }
 319             }
 320
 321             if (e) {
 322                 continue;
 323             }
 324
 325             type_initialize_interface(ti, t, t);
 326         }
 327     } else {
 328         ti->class->properties = g_hash_table_new_full(
 329             g_str_hash, g_str_equal, g_free, object_property_free);
 330     }
 331
 332     ti->class->type = ti;
 333
 334     while (parent) {
 335         if (parent->class_base_init) {
 336             parent->class_base_init(ti->class, ti->class_data);
 337         }
 338         parent = type_get_parent(parent);
 339     }
 340
 341     if (ti->class_init) {
 342         ti->class_init(ti->class, ti->class_data);
 343     }
 344 }
 345
 346 static void object_init_with_type(Object *obj, TypeImpl *ti)
 347 {
 348     if (type_has_parent(ti)) {
 349         object_init_with_type(obj, type_get_parent(ti));
 350     }
 351
 352     if (ti->instance_init) {
 353         ti->instance_init(obj);
 354     }
 355 }
 356
 357 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 358 {
 359     if (ti->instance_post_init) {
 360         ti->instance_post_init(obj);
 361     }
 362
 363     if (type_has_parent(ti)) {
 364         object_post_init_with_type(obj, type_get_parent(ti));
 365     }
 366 }
 367
 368 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 369 {
 370     Object *obj = data;
 371
 372     g_assert(type != NULL);
 373     type_initialize(type);
 374
 375     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 376     g_assert(type->abstract == false);
 377     g_assert_cmpint(size, >=, type->instance_size);
 378
 379     memset(obj, 0, type->instance_size);
 380     obj->class = type->class;
 381     object_ref(obj);
 382     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 383                                             NULL, object_property_free);
 384     object_init_with_type(obj, type);
 385     object_post_init_with_type(obj, type);
 386 }
 387
 388 void object_initialize(void *data, size_t size, const char *typename)
 389 {
 390     TypeImpl *type = type_get_by_name(typename);
 391
 392     object_initialize_with_type(data, size, type);
 393 }
 394
 395 static inline bool object_property_is_child(ObjectProperty *prop)
 396 {
 397     return strstart(prop->type, "child<", NULL);
 398 }
 399
 400 static void object_property_del_all(Object *obj)
 401 {
 402     ObjectProperty *prop;
 403     GHashTableIter iter;
 404     gpointer key, value;
 405     bool released;
 406
 407     do {
 408         released = false;
 409         g_hash_table_iter_init(&iter, obj->properties);
 410         while (g_hash_table_iter_next(&iter, &key, &value)) {
 411             prop = value;
 412             if (prop->release) {
 413                 prop->release(obj, prop->name, prop->opaque);
 414                 prop->release = NULL;
 415                 released = true;
 416                 break;
 417             }
 418             g_hash_table_iter_remove(&iter);
 419         }
 420     } while (released);
 421
 422     g_hash_table_unref(obj->properties);
 423 }
 424
 425 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 426 {
 427     ObjectProperty *prop;
 428     GHashTableIter iter;
 429     gpointer key, value;
 430
 431     g_hash_table_iter_init(&iter, obj->properties);
 432     while (g_hash_table_iter_next(&iter, &key, &value)) {
 433         prop = value;
 434         if (object_property_is_child(prop) && prop->opaque == child) {
 435             if (prop->release) {
 436                 prop->release(obj, prop->name, prop->opaque);
 437                 prop->release = NULL;
 438             }
 439             break;
 440         }
 441     }
 442     g_hash_table_iter_init(&iter, obj->properties);
 443     while (g_hash_table_iter_next(&iter, &key, &value)) {
 444         prop = value;
 445         if (object_property_is_child(prop) && prop->opaque == child) {
 446             g_hash_table_iter_remove(&iter);
 447             break;
 448         }
 449     }
 450 }
 451
 452 void object_unparent(Object *obj)
 453 {
 454     if (obj->parent) {
 455         object_property_del_child(obj->parent, obj, NULL);
 456     }
 457 }
 458
 459 static void object_deinit(Object *obj, TypeImpl *type)
 460 {
 461     if (type->instance_finalize) {
 462         type->instance_finalize(obj);
 463     }
 464
 465     if (type_has_parent(type)) {
 466         object_deinit(obj, type_get_parent(type));
 467     }
 468 }
 469
 470 static void object_finalize(void *data)
 471 {
 472     Object *obj = data;
 473     TypeImpl *ti = obj->class->type;
 474
 475     object_property_del_all(obj);
 476     object_deinit(obj, ti);
 477
 478     g_assert_cmpint(obj->ref, ==, 0);
 479     if (obj->free) {
 480         obj->free(obj);
 481     }
 482 }
 483
 484 static Object *object_new_with_type(Type type)
 485 {
 486     Object *obj;
 487
 488     g_assert(type != NULL);
 489     type_initialize(type);
 490
 491     obj = g_malloc(type->instance_size);
 492     object_initialize_with_type(obj, type->instance_size, type);
 493     obj->free = g_free;
 494
 495     return obj;
 496 }
 497
 498 Object *object_new(const char *typename)
 499 {
 500     TypeImpl *ti = type_get_by_name(typename);
 501
 502     return object_new_with_type(ti);
 503 }
 504
 505
 506 Object *object_new_with_props(const char *typename,
 507                               Object *parent,
 508                               const char *id,
 509                               Error **errp,
 510                               ...)
 511 {
 512     va_list vargs;
 513     Object *obj;
 514
 515     va_start(vargs, errp);
 516     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 517     va_end(vargs);
 518
 519     return obj;
 520 }
 521
 522
 523 Object *object_new_with_propv(const char *typename,
 524                               Object *parent,
 525                               const char *id,
 526                               Error **errp,
 527                               va_list vargs)
 528 {
 529     Object *obj;
 530     ObjectClass *klass;
 531     Error *local_err = NULL;
 532
 533     klass = object_class_by_name(typename);
 534     if (!klass) {
 535         error_setg(errp, "invalid object type: %s", typename);
 536         return NULL;
 537     }
 538
 539     if (object_class_is_abstract(klass)) {
 540         error_setg(errp, "object type '%s' is abstract", typename);
 541         return NULL;
 542     }
 543     obj = object_new(typename);
 544
 545     if (object_set_propv(obj, &local_err, vargs) < 0) {
 546         goto error;
 547     }
 548
 549     object_property_add_child(parent, id, obj, &local_err);
 550     if (local_err) {
 551         goto error;
 552     }
 553
 554     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 555         user_creatable_complete(obj, &local_err);
 556         if (local_err) {
 557             object_unparent(obj);
 558             goto error;
 559         }
 560     }
 561
 562     object_unref(OBJECT(obj));
 563     return obj;
 564
 565  error:
 566     error_propagate(errp, local_err);
 567     object_unref(obj);
 568     return NULL;
 569 }
 570
 571
 572 int object_set_props(Object *obj,
 573                      Error **errp,
 574                      ...)
 575 {
 576     va_list vargs;
 577     int ret;
 578
 579     va_start(vargs, errp);
 580     ret = object_set_propv(obj, errp, vargs);
 581     va_end(vargs);
 582
 583     return ret;
 584 }
 585
 586
 587 int object_set_propv(Object *obj,
 588                      Error **errp,
 589                      va_list vargs)
 590 {
 591     const char *propname;
 592     Error *local_err = NULL;
 593
 594     propname = va_arg(vargs, char *);
 595     while (propname != NULL) {
 596         const char *value = va_arg(vargs, char *);
 597
 598         g_assert(value != NULL);
 599         object_property_parse(obj, value, propname, &local_err);
 600         if (local_err) {
 601             error_propagate(errp, local_err);
 602             return -1;
 603         }
 604         propname = va_arg(vargs, char *);
 605     }
 606
 607     return 0;
 608 }
 609
 610
 611 Object *object_dynamic_cast(Object *obj, const char *typename)
 612 {
 613     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 614         return obj;
 615     }
 616
 617     return NULL;
 618 }
 619
 620 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 621                                    const char *file, int line, const char *func)
 622 {
 623     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 624                                      typename, file, line, func);
 625
 626 #ifdef CONFIG_QOM_CAST_DEBUG
 627     int i;
 628     Object *inst;
 629
 630     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 631         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 632             goto out;
 633         }
 634     }
 635
 636     inst = object_dynamic_cast(obj, typename);
 637
 638     if (!inst && obj) {
 639         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 640                 file, line, func, obj, typename);
 641         abort();
 642     }
 643
 644     assert(obj == inst);
 645
 646     if (obj && obj == inst) {
 647         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 648             atomic_set(&obj->class->object_cast_cache[i - 1],
 649                        atomic_read(&obj->class->object_cast_cache[i]));
 650         }
 651         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 652     }
 653
 654 out:
 655 #endif
 656     return obj;
 657 }
 658
 659 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 660                                        const char *typename)
 661 {
 662     ObjectClass *ret = NULL;
 663     TypeImpl *target_type;
 664     TypeImpl *type;
 665
 666     if (!class) {
 667         return NULL;
 668     }
 669
 670     /* A simple fast path that can trigger a lot for leaf classes.  */
 671     type = class->type;
 672     if (type->name == typename) {
 673         return class;
 674     }
 675
 676     target_type = type_get_by_name(typename);
 677     if (!target_type) {
 678         /* target class type unknown, so fail the cast */
 679         return NULL;
 680     }
 681
 682     if (type->class->interfaces &&
 683             type_is_ancestor(target_type, type_interface)) {
 684         int found = 0;
 685         GSList *i;
 686
 687         for (i = class->interfaces; i; i = i->next) {
 688             ObjectClass *target_class = i->data;
 689
 690             if (type_is_ancestor(target_class->type, target_type)) {
 691                 ret = target_class;
 692                 found++;
 693             }
 694          }
 695
 696         /* The match was ambiguous, don't allow a cast */
 697         if (found > 1) {
 698             ret = NULL;
 699         }
 700     } else if (type_is_ancestor(type, target_type)) {
 701         ret = class;
 702     }
 703
 704     return ret;
 705 }
 706
 707 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 708                                               const char *typename,
 709                                               const char *file, int line,
 710                                               const char *func)
 711 {
 712     ObjectClass *ret;
 713
 714     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 715                                            typename, file, line, func);
 716
 717 #ifdef CONFIG_QOM_CAST_DEBUG
 718     int i;
 719
 720     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 721         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 722             ret = class;
 723             goto out;
 724         }
 725     }
 726 #else
 727     if (!class || !class->interfaces) {
 728         return class;
 729     }
 730 #endif
 731
 732     ret = object_class_dynamic_cast(class, typename);
 733     if (!ret && class) {
 734         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 735                 file, line, func, class, typename);
 736         abort();
 737     }
 738
 739 #ifdef CONFIG_QOM_CAST_DEBUG
 740     if (class && ret == class) {
 741         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 742             atomic_set(&class->class_cast_cache[i - 1],
 743                        atomic_read(&class->class_cast_cache[i]));
 744         }
 745         atomic_set(&class->class_cast_cache[i - 1], typename);
 746     }
 747 out:
 748 #endif
 749     return ret;
 750 }
 751
 752 const char *object_get_typename(const Object *obj)
 753 {
 754     return obj->class->type->name;
 755 }
 756
 757 ObjectClass *object_get_class(Object *obj)
 758 {
 759     return obj->class;
 760 }
 761
 762 bool object_class_is_abstract(ObjectClass *klass)
 763 {
 764     return klass->type->abstract;
 765 }
 766
 767 const char *object_class_get_name(ObjectClass *klass)
 768 {
 769     return klass->type->name;
 770 }
 771
 772 ObjectClass *object_class_by_name(const char *typename)
 773 {
 774     TypeImpl *type = type_get_by_name(typename);
 775
 776     if (!type) {
 777         return NULL;
 778     }
 779
 780     type_initialize(type);
 781
 782     return type->class;
 783 }
 784
 785 ObjectClass *object_class_get_parent(ObjectClass *class)
 786 {
 787     TypeImpl *type = type_get_parent(class->type);
 788
 789     if (!type) {
 790         return NULL;
 791     }
 792
 793     type_initialize(type);
 794
 795     return type->class;
 796 }
 797
 798 typedef struct OCFData
 799 {
 800     void (*fn)(ObjectClass *klass, void *opaque);
 801     const char *implements_type;
 802     bool include_abstract;
 803     void *opaque;
 804 } OCFData;
 805
 806 static void object_class_foreach_tramp(gpointer key, gpointer value,
 807                                        gpointer opaque)
 808 {
 809     OCFData *data = opaque;
 810     TypeImpl *type = value;
 811     ObjectClass *k;
 812
 813     type_initialize(type);
 814     k = type->class;
 815
 816     if (!data->include_abstract && type->abstract) {
 817         return;
 818     }
 819
 820     if (data->implements_type &&
 821         !object_class_dynamic_cast(k, data->implements_type)) {
 822         return;
 823     }
 824
 825     data->fn(k, data->opaque);
 826 }
 827
 828 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 829                           const char *implements_type, bool include_abstract,
 830                           void *opaque)
 831 {
 832     OCFData data = { fn, implements_type, include_abstract, opaque };
 833
 834     enumerating_types = true;
 835     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 836     enumerating_types = false;
 837 }
 838
 839 static int do_object_child_foreach(Object *obj,
 840                                    int (*fn)(Object *child, void *opaque),
 841                                    void *opaque, bool recurse)
 842 {
 843     GHashTableIter iter;
 844     ObjectProperty *prop;
 845     int ret = 0;
 846
 847     g_hash_table_iter_init(&iter, obj->properties);
 848     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 849         if (object_property_is_child(prop)) {
 850             Object *child = prop->opaque;
 851
 852             ret = fn(child, opaque);
 853             if (ret != 0) {
 854                 break;
 855             }
 856             if (recurse) {
 857                 do_object_child_foreach(child, fn, opaque, true);
 858             }
 859         }
 860     }
 861     return ret;
 862 }
 863
 864 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 865                          void *opaque)
 866 {
 867     return do_object_child_foreach(obj, fn, opaque, false);
 868 }
 869
 870 int object_child_foreach_recursive(Object *obj,
 871                                    int (*fn)(Object *child, void *opaque),
 872                                    void *opaque)
 873 {
 874     return do_object_child_foreach(obj, fn, opaque, true);
 875 }
 876
 877 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 878 {
 879     GSList **list = opaque;
 880
 881     *list = g_slist_prepend(*list, klass);
 882 }
 883
 884 GSList *object_class_get_list(const char *implements_type,
 885                               bool include_abstract)
 886 {
 887     GSList *list = NULL;
 888
 889     object_class_foreach(object_class_get_list_tramp,
 890                          implements_type, include_abstract, &list);
 891     return list;
 892 }
 893
 894 static gint object_class_cmp(gconstpointer a, gconstpointer b)
 895 {
 896     return strcasecmp(object_class_get_name((ObjectClass *)a),
 897                       object_class_get_name((ObjectClass *)b));
 898 }
 899
 900 GSList *object_class_get_list_sorted(const char *implements_type,
 901                                      bool include_abstract)
 902 {
 903     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
 904                         object_class_cmp);
 905 }
 906
 907 void object_ref(Object *obj)
 908 {
 909     if (!obj) {
 910         return;
 911     }
 912     atomic_inc(&obj->ref);
 913 }
 914
 915 void object_unref(Object *obj)
 916 {
 917     if (!obj) {
 918         return;
 919     }
 920     g_assert_cmpint(obj->ref, >, 0);
 921
 922     /* parent always holds a reference to its children */
 923     if (atomic_fetch_dec(&obj->ref) == 1) {
 924         object_finalize(obj);
 925     }
 926 }
 927
 928 ObjectProperty *
 929 object_property_add(Object *obj, const char *name, const char *type,
 930                     ObjectPropertyAccessor *get,
 931                     ObjectPropertyAccessor *set,
 932                     ObjectPropertyRelease *release,
 933                     void *opaque, Error **errp)
 934 {
 935     ObjectProperty *prop;
 936     size_t name_len = strlen(name);
 937
 938     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 939         int i;
 940         ObjectProperty *ret;
 941         char *name_no_array = g_strdup(name);
 942
 943         name_no_array[name_len - 3] = '\0';
 944         for (i = 0; ; ++i) {
 945             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 946
 947             ret = object_property_add(obj, full_name, type, get, set,
 948                                       release, opaque, NULL);
 949             g_free(full_name);
 950             if (ret) {
 951                 break;
 952             }
 953         }
 954         g_free(name_no_array);
 955         return ret;
 956     }
 957
 958     if (object_property_find(obj, name, NULL) != NULL) {
 959         error_setg(errp, "attempt to add duplicate property '%s'"
 960                    " to object (type '%s')", name,
 961                    object_get_typename(obj));
 962         return NULL;
 963     }
 964
 965     prop = g_malloc0(sizeof(*prop));
 966
 967     prop->name = g_strdup(name);
 968     prop->type = g_strdup(type);
 969
 970     prop->get = get;
 971     prop->set = set;
 972     prop->release = release;
 973     prop->opaque = opaque;
 974
 975     g_hash_table_insert(obj->properties, prop->name, prop);
 976     return prop;
 977 }
 978
 979 ObjectProperty *
 980 object_class_property_add(ObjectClass *klass,
 981                           const char *name,
 982                           const char *type,
 983                           ObjectPropertyAccessor *get,
 984                           ObjectPropertyAccessor *set,
 985                           ObjectPropertyRelease *release,
 986                           void *opaque,
 987                           Error **errp)
 988 {
 989     ObjectProperty *prop;
 990
 991     if (object_class_property_find(klass, name, NULL) != NULL) {
 992         error_setg(errp, "attempt to add duplicate property '%s'"
 993                    " to object (type '%s')", name,
 994                    object_class_get_name(klass));
 995         return NULL;
 996     }
 997
 998     prop = g_malloc0(sizeof(*prop));
 999
1000     prop->name = g_strdup(name);
1001     prop->type = g_strdup(type);
1002
1003     prop->get = get;
1004     prop->set = set;
1005     prop->release = release;
1006     prop->opaque = opaque;
1007
1008     g_hash_table_insert(klass->properties, g_strdup(name), prop);
1009
1010     return prop;
1011 }
1012
1013 ObjectProperty *object_property_find(Object *obj, const char *name,
1014                                      Error **errp)
1015 {
1016     ObjectProperty *prop;
1017     ObjectClass *klass = object_get_class(obj);
1018
1019     prop = object_class_property_find(klass, name, NULL);
1020     if (prop) {
1021         return prop;
1022     }
1023
1024     prop = g_hash_table_lookup(obj->properties, name);
1025     if (prop) {
1026         return prop;
1027     }
1028
1029     error_setg(errp, "Property '.%s' not found", name);
1030     return NULL;
1031 }
1032
1033 void object_property_iter_init(ObjectPropertyIterator *iter,
1034                                Object *obj)
1035 {
1036     g_hash_table_iter_init(&iter->iter, obj->properties);
1037     iter->nextclass = object_get_class(obj);
1038 }
1039
1040 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1041 {
1042     gpointer key, val;
1043     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1044         if (!iter->nextclass) {
1045             return NULL;
1046         }
1047         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1048         iter->nextclass = object_class_get_parent(iter->nextclass);
1049     }
1050     return val;
1051 }
1052
1053 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1054                                      ObjectClass *klass)
1055 {
1056     g_hash_table_iter_init(&iter->iter, klass->properties);
1057     iter->nextclass = klass;
1058 }
1059
1060 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1061                                            Error **errp)
1062 {
1063     ObjectProperty *prop;
1064     ObjectClass *parent_klass;
1065
1066     parent_klass = object_class_get_parent(klass);
1067     if (parent_klass) {
1068         prop = object_class_property_find(parent_klass, name, NULL);
1069         if (prop) {
1070             return prop;
1071         }
1072     }
1073
1074     prop = g_hash_table_lookup(klass->properties, name);
1075     if (!prop) {
1076         error_setg(errp, "Property '.%s' not found", name);
1077     }
1078     return prop;
1079 }
1080
1081 void object_property_del(Object *obj, const char *name, Error **errp)
1082 {
1083     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1084
1085     if (!prop) {
1086         error_setg(errp, "Property '.%s' not found", name);
1087         return;
1088     }
1089
1090     if (prop->release) {
1091         prop->release(obj, name, prop->opaque);
1092     }
1093     g_hash_table_remove(obj->properties, name);
1094 }
1095
1096 void object_property_get(Object *obj, Visitor *v, const char *name,
1097                          Error **errp)
1098 {
1099     ObjectProperty *prop = object_property_find(obj, name, errp);
1100     if (prop == NULL) {
1101         return;
1102     }
1103
1104     if (!prop->get) {
1105         error_setg(errp, QERR_PERMISSION_DENIED);
1106     } else {
1107         prop->get(obj, v, name, prop->opaque, errp);
1108     }
1109 }
1110
1111 void object_property_set(Object *obj, Visitor *v, const char *name,
1112                          Error **errp)
1113 {
1114     ObjectProperty *prop = object_property_find(obj, name, errp);
1115     if (prop == NULL) {
1116         return;
1117     }
1118
1119     if (!prop->set) {
1120         error_setg(errp, QERR_PERMISSION_DENIED);
1121     } else {
1122         prop->set(obj, v, name, prop->opaque, errp);
1123     }
1124 }
1125
1126 void object_property_set_str(Object *obj, const char *value,
1127                              const char *name, Error **errp)
1128 {
1129     QString *qstr = qstring_from_str(value);
1130     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1131
1132     qobject_unref(qstr);
1133 }
1134
1135 char *object_property_get_str(Object *obj, const char *name,
1136                               Error **errp)
1137 {
1138     QObject *ret = object_property_get_qobject(obj, name, errp);
1139     char *retval;
1140
1141     if (!ret) {
1142         return NULL;
1143     }
1144
1145     retval = g_strdup(qobject_get_try_str(ret));
1146     if (!retval) {
1147         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1148     }
1149
1150     qobject_unref(ret);
1151     return retval;
1152 }
1153
1154 void object_property_set_link(Object *obj, Object *value,
1155                               const char *name, Error **errp)
1156 {
1157     if (value) {
1158         gchar *path = object_get_canonical_path(value);
1159         object_property_set_str(obj, path, name, errp);
1160         g_free(path);
1161     } else {
1162         object_property_set_str(obj, "", name, errp);
1163     }
1164 }
1165
1166 Object *object_property_get_link(Object *obj, const char *name,
1167                                  Error **errp)
1168 {
1169     char *str = object_property_get_str(obj, name, errp);
1170     Object *target = NULL;
1171
1172     if (str && *str) {
1173         target = object_resolve_path(str, NULL);
1174         if (!target) {
1175             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1176                       "Device '%s' not found", str);
1177         }
1178     }
1179
1180     g_free(str);
1181     return target;
1182 }
1183
1184 void object_property_set_bool(Object *obj, bool value,
1185                               const char *name, Error **errp)
1186 {
1187     QBool *qbool = qbool_from_bool(value);
1188     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1189
1190     qobject_unref(qbool);
1191 }
1192
1193 bool object_property_get_bool(Object *obj, const char *name,
1194                               Error **errp)
1195 {
1196     QObject *ret = object_property_get_qobject(obj, name, errp);
1197     QBool *qbool;
1198     bool retval;
1199
1200     if (!ret) {
1201         return false;
1202     }
1203     qbool = qobject_to(QBool, ret);
1204     if (!qbool) {
1205         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1206         retval = false;
1207     } else {
1208         retval = qbool_get_bool(qbool);
1209     }
1210
1211     qobject_unref(ret);
1212     return retval;
1213 }
1214
1215 void object_property_set_int(Object *obj, int64_t value,
1216                              const char *name, Error **errp)
1217 {
1218     QNum *qnum = qnum_from_int(value);
1219     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1220
1221     qobject_unref(qnum);
1222 }
1223
1224 int64_t object_property_get_int(Object *obj, const char *name,
1225                                 Error **errp)
1226 {
1227     QObject *ret = object_property_get_qobject(obj, name, errp);
1228     QNum *qnum;
1229     int64_t retval;
1230
1231     if (!ret) {
1232         return -1;
1233     }
1234
1235     qnum = qobject_to(QNum, ret);
1236     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1237         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1238         retval = -1;
1239     }
1240
1241     qobject_unref(ret);
1242     return retval;
1243 }
1244
1245 void object_property_set_uint(Object *obj, uint64_t value,
1246                               const char *name, Error **errp)
1247 {
1248     QNum *qnum = qnum_from_uint(value);
1249
1250     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1251     qobject_unref(qnum);
1252 }
1253
1254 uint64_t object_property_get_uint(Object *obj, const char *name,
1255                                   Error **errp)
1256 {
1257     QObject *ret = object_property_get_qobject(obj, name, errp);
1258     QNum *qnum;
1259     uint64_t retval;
1260
1261     if (!ret) {
1262         return 0;
1263     }
1264     qnum = qobject_to(QNum, ret);
1265     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1266         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1267         retval = 0;
1268     }
1269
1270     qobject_unref(ret);
1271     return retval;
1272 }
1273
1274 typedef struct EnumProperty {
1275     const QEnumLookup *lookup;
1276     int (*get)(Object *, Error **);
1277     void (*set)(Object *, int, Error **);
1278 } EnumProperty;
1279
1280 int object_property_get_enum(Object *obj, const char *name,
1281                              const char *typename, Error **errp)
1282 {
1283     Error *err = NULL;
1284     Visitor *v;
1285     char *str;
1286     int ret;
1287     ObjectProperty *prop = object_property_find(obj, name, errp);
1288     EnumProperty *enumprop;
1289
1290     if (prop == NULL) {
1291         return 0;
1292     }
1293
1294     if (!g_str_equal(prop->type, typename)) {
1295         error_setg(errp, "Property %s on %s is not '%s' enum type",
1296                    name, object_class_get_name(
1297                        object_get_class(obj)), typename);
1298         return 0;
1299     }
1300
1301     enumprop = prop->opaque;
1302
1303     v = string_output_visitor_new(false, &str);
1304     object_property_get(obj, v, name, &err);
1305     if (err) {
1306         error_propagate(errp, err);
1307         visit_free(v);
1308         return 0;
1309     }
1310     visit_complete(v, &str);
1311     visit_free(v);
1312     v = string_input_visitor_new(str);
1313     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1314
1315     g_free(str);
1316     visit_free(v);
1317
1318     return ret;
1319 }
1320
1321 void object_property_get_uint16List(Object *obj, const char *name,
1322                                     uint16List **list, Error **errp)
1323 {
1324     Error *err = NULL;
1325     Visitor *v;
1326     char *str;
1327
1328     v = string_output_visitor_new(false, &str);
1329     object_property_get(obj, v, name, &err);
1330     if (err) {
1331         error_propagate(errp, err);
1332         goto out;
1333     }
1334     visit_complete(v, &str);
1335     visit_free(v);
1336     v = string_input_visitor_new(str);
1337     visit_type_uint16List(v, NULL, list, errp);
1338
1339     g_free(str);
1340 out:
1341     visit_free(v);
1342 }
1343
1344 void object_property_parse(Object *obj, const char *string,
1345                            const char *name, Error **errp)
1346 {
1347     Visitor *v = string_input_visitor_new(string);
1348     object_property_set(obj, v, name, errp);
1349     visit_free(v);
1350 }
1351
1352 char *object_property_print(Object *obj, const char *name, bool human,
1353                             Error **errp)
1354 {
1355     Visitor *v;
1356     char *string = NULL;
1357     Error *local_err = NULL;
1358
1359     v = string_output_visitor_new(human, &string);
1360     object_property_get(obj, v, name, &local_err);
1361     if (local_err) {
1362         error_propagate(errp, local_err);
1363         goto out;
1364     }
1365
1366     visit_complete(v, &string);
1367
1368 out:
1369     visit_free(v);
1370     return string;
1371 }
1372
1373 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1374 {
1375     ObjectProperty *prop = object_property_find(obj, name, errp);
1376     if (prop == NULL) {
1377         return NULL;
1378     }
1379
1380     return prop->type;
1381 }
1382
1383 Object *object_get_root(void)
1384 {
1385     static Object *root;
1386
1387     if (!root) {
1388         root = object_new("container");
1389     }
1390
1391     return root;
1392 }
1393
1394 Object *object_get_objects_root(void)
1395 {
1396     return container_get(object_get_root(), "/objects");
1397 }
1398
1399 Object *object_get_internal_root(void)
1400 {
1401     static Object *internal_root;
1402
1403     if (!internal_root) {
1404         internal_root = object_new("container");
1405     }
1406
1407     return internal_root;
1408 }
1409
1410 static void object_get_child_property(Object *obj, Visitor *v,
1411                                       const char *name, void *opaque,
1412                                       Error **errp)
1413 {
1414     Object *child = opaque;
1415     gchar *path;
1416
1417     path = object_get_canonical_path(child);
1418     visit_type_str(v, name, &path, errp);
1419     g_free(path);
1420 }
1421
1422 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1423 {
1424     return opaque;
1425 }
1426
1427 static void object_finalize_child_property(Object *obj, const char *name,
1428                                            void *opaque)
1429 {
1430     Object *child = opaque;
1431
1432     if (child->class->unparent) {
1433         (child->class->unparent)(child);
1434     }
1435     child->parent = NULL;
1436     object_unref(child);
1437 }
1438
1439 void object_property_add_child(Object *obj, const char *name,
1440                                Object *child, Error **errp)
1441 {
1442     Error *local_err = NULL;
1443     gchar *type;
1444     ObjectProperty *op;
1445
1446     if (child->parent != NULL) {
1447         error_setg(errp, "child object is already parented");
1448         return;
1449     }
1450
1451     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1452
1453     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1454                              object_finalize_child_property, child, &local_err);
1455     if (local_err) {
1456         error_propagate(errp, local_err);
1457         goto out;
1458     }
1459
1460     op->resolve = object_resolve_child_property;
1461     object_ref(child);
1462     child->parent = obj;
1463
1464 out:
1465     g_free(type);
1466 }
1467
1468 void object_property_allow_set_link(const Object *obj, const char *name,
1469                                     Object *val, Error **errp)
1470 {
1471     /* Allow the link to be set, always */
1472 }
1473
1474 typedef struct {
1475     Object **child;
1476     void (*check)(const Object *, const char *, Object *, Error **);
1477     ObjectPropertyLinkFlags flags;
1478 } LinkProperty;
1479
1480 static void object_get_link_property(Object *obj, Visitor *v,
1481                                      const char *name, void *opaque,
1482                                      Error **errp)
1483 {
1484     LinkProperty *lprop = opaque;
1485     Object **child = lprop->child;
1486     gchar *path;
1487
1488     if (*child) {
1489         path = object_get_canonical_path(*child);
1490         visit_type_str(v, name, &path, errp);
1491         g_free(path);
1492     } else {
1493         path = (gchar *)"";
1494         visit_type_str(v, name, &path, errp);
1495     }
1496 }
1497
1498 /*
1499  * object_resolve_link:
1500  *
1501  * Lookup an object and ensure its type matches the link property type.  This
1502  * is similar to object_resolve_path() except type verification against the
1503  * link property is performed.
1504  *
1505  * Returns: The matched object or NULL on path lookup failures.
1506  */
1507 static Object *object_resolve_link(Object *obj, const char *name,
1508                                    const char *path, Error **errp)
1509 {
1510     const char *type;
1511     gchar *target_type;
1512     bool ambiguous = false;
1513     Object *target;
1514
1515     /* Go from link<FOO> to FOO.  */
1516     type = object_property_get_type(obj, name, NULL);
1517     target_type = g_strndup(&type[5], strlen(type) - 6);
1518     target = object_resolve_path_type(path, target_type, &ambiguous);
1519
1520     if (ambiguous) {
1521         error_setg(errp, "Path '%s' does not uniquely identify an object",
1522                    path);
1523     } else if (!target) {
1524         target = object_resolve_path(path, &ambiguous);
1525         if (target || ambiguous) {
1526             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1527         } else {
1528             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1529                       "Device '%s' not found", path);
1530         }
1531         target = NULL;
1532     }
1533     g_free(target_type);
1534
1535     return target;
1536 }
1537
1538 static void object_set_link_property(Object *obj, Visitor *v,
1539                                      const char *name, void *opaque,
1540                                      Error **errp)
1541 {
1542     Error *local_err = NULL;
1543     LinkProperty *prop = opaque;
1544     Object **child = prop->child;
1545     Object *old_target = *child;
1546     Object *new_target = NULL;
1547     char *path = NULL;
1548
1549     visit_type_str(v, name, &path, &local_err);
1550
1551     if (!local_err && strcmp(path, "") != 0) {
1552         new_target = object_resolve_link(obj, name, path, &local_err);
1553     }
1554
1555     g_free(path);
1556     if (local_err) {
1557         error_propagate(errp, local_err);
1558         return;
1559     }
1560
1561     prop->check(obj, name, new_target, &local_err);
1562     if (local_err) {
1563         error_propagate(errp, local_err);
1564         return;
1565     }
1566
1567     object_ref(new_target);
1568     *child = new_target;
1569     object_unref(old_target);
1570 }
1571
1572 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1573 {
1574     LinkProperty *lprop = opaque;
1575
1576     return *lprop->child;
1577 }
1578
1579 static void object_release_link_property(Object *obj, const char *name,
1580                                          void *opaque)
1581 {
1582     LinkProperty *prop = opaque;
1583
1584     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1585         object_unref(*prop->child);
1586     }
1587     g_free(prop);
1588 }
1589
1590 void object_property_add_link(Object *obj, const char *name,
1591                               const char *type, Object **child,
1592                               void (*check)(const Object *, const char *,
1593                                             Object *, Error **),
1594                               ObjectPropertyLinkFlags flags,
1595                               Error **errp)
1596 {
1597     Error *local_err = NULL;
1598     LinkProperty *prop = g_malloc(sizeof(*prop));
1599     gchar *full_type;
1600     ObjectProperty *op;
1601
1602     prop->child = child;
1603     prop->check = check;
1604     prop->flags = flags;
1605
1606     full_type = g_strdup_printf("link<%s>", type);
1607
1608     op = object_property_add(obj, name, full_type,
1609                              object_get_link_property,
1610                              check ? object_set_link_property : NULL,
1611                              object_release_link_property,
1612                              prop,
1613                              &local_err);
1614     if (local_err) {
1615         error_propagate(errp, local_err);
1616         g_free(prop);
1617         goto out;
1618     }
1619
1620     op->resolve = object_resolve_link_property;
1621
1622 out:
1623     g_free(full_type);
1624 }
1625
1626 void object_property_add_const_link(Object *obj, const char *name,
1627                                     Object *target, Error **errp)
1628 {
1629     char *link_type;
1630     ObjectProperty *op;
1631
1632     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1633     op = object_property_add(obj, name, link_type,
1634                              object_get_child_property, NULL,
1635                              NULL, target, errp);
1636     if (op != NULL) {
1637         op->resolve = object_resolve_child_property;
1638     }
1639     g_free(link_type);
1640 }
1641
1642 gchar *object_get_canonical_path_component(Object *obj)
1643 {
1644     ObjectProperty *prop = NULL;
1645     GHashTableIter iter;
1646
1647     if (obj->parent == NULL) {
1648         return NULL;
1649     }
1650
1651     g_hash_table_iter_init(&iter, obj->parent->properties);
1652     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1653         if (!object_property_is_child(prop)) {
1654             continue;
1655         }
1656
1657         if (prop->opaque == obj) {
1658             return g_strdup(prop->name);
1659         }
1660     }
1661
1662     /* obj had a parent but was not a child, should never happen */
1663     g_assert_not_reached();
1664     return NULL;
1665 }
1666
1667 gchar *object_get_canonical_path(Object *obj)
1668 {
1669     Object *root = object_get_root();
1670     char *newpath, *path = NULL;
1671
1672     if (obj == root) {
1673         return g_strdup("/");
1674     }
1675
1676     do {
1677         char *component = object_get_canonical_path_component(obj);
1678
1679         if (!component) {
1680             /* A canonical path must be complete, so discard what was
1681              * collected so far.
1682              */
1683             g_free(path);
1684             return NULL;
1685         }
1686
1687         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1688         g_free(path);
1689         g_free(component);
1690         path = newpath;
1691         obj = obj->parent;
1692     } while (obj != root);
1693
1694     return path;
1695 }
1696
1697 Object *object_resolve_path_component(Object *parent, const gchar *part)
1698 {
1699     ObjectProperty *prop = object_property_find(parent, part, NULL);
1700     if (prop == NULL) {
1701         return NULL;
1702     }
1703
1704     if (prop->resolve) {
1705         return prop->resolve(parent, prop->opaque, part);
1706     } else {
1707         return NULL;
1708     }
1709 }
1710
1711 static Object *object_resolve_abs_path(Object *parent,
1712                                           gchar **parts,
1713                                           const char *typename,
1714                                           int index)
1715 {
1716     Object *child;
1717
1718     if (parts[index] == NULL) {
1719         return object_dynamic_cast(parent, typename);
1720     }
1721
1722     if (strcmp(parts[index], "") == 0) {
1723         return object_resolve_abs_path(parent, parts, typename, index + 1);
1724     }
1725
1726     child = object_resolve_path_component(parent, parts[index]);
1727     if (!child) {
1728         return NULL;
1729     }
1730
1731     return object_resolve_abs_path(child, parts, typename, index + 1);
1732 }
1733
1734 static Object *object_resolve_partial_path(Object *parent,
1735                                               gchar **parts,
1736                                               const char *typename,
1737                                               bool *ambiguous)
1738 {
1739     Object *obj;
1740     GHashTableIter iter;
1741     ObjectProperty *prop;
1742
1743     obj = object_resolve_abs_path(parent, parts, typename, 0);
1744
1745     g_hash_table_iter_init(&iter, parent->properties);
1746     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1747         Object *found;
1748
1749         if (!object_property_is_child(prop)) {
1750             continue;
1751         }
1752
1753         found = object_resolve_partial_path(prop->opaque, parts,
1754                                             typename, ambiguous);
1755         if (found) {
1756             if (obj) {
1757                 *ambiguous = true;
1758                 return NULL;
1759             }
1760             obj = found;
1761         }
1762
1763         if (*ambiguous) {
1764             return NULL;
1765         }
1766     }
1767
1768     return obj;
1769 }
1770
1771 Object *object_resolve_path_type(const char *path, const char *typename,
1772                                  bool *ambiguousp)
1773 {
1774     Object *obj;
1775     gchar **parts;
1776
1777     parts = g_strsplit(path, "/", 0);
1778     assert(parts);
1779
1780     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1781         bool ambiguous = false;
1782         obj = object_resolve_partial_path(object_get_root(), parts,
1783                                           typename, &ambiguous);
1784         if (ambiguousp) {
1785             *ambiguousp = ambiguous;
1786         }
1787     } else {
1788         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1789     }
1790
1791     g_strfreev(parts);
1792
1793     return obj;
1794 }
1795
1796 Object *object_resolve_path(const char *path, bool *ambiguous)
1797 {
1798     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1799 }
1800
1801 typedef struct StringProperty
1802 {
1803     char *(*get)(Object *, Error **);
1804     void (*set)(Object *, const char *, Error **);
1805 } StringProperty;
1806
1807 static void property_get_str(Object *obj, Visitor *v, const char *name,
1808                              void *opaque, Error **errp)
1809 {
1810     StringProperty *prop = opaque;
1811     char *value;
1812     Error *err = NULL;
1813
1814     value = prop->get(obj, &err);
1815     if (err) {
1816         error_propagate(errp, err);
1817         return;
1818     }
1819
1820     visit_type_str(v, name, &value, errp);
1821     g_free(value);
1822 }
1823
1824 static void property_set_str(Object *obj, Visitor *v, const char *name,
1825                              void *opaque, Error **errp)
1826 {
1827     StringProperty *prop = opaque;
1828     char *value;
1829     Error *local_err = NULL;
1830
1831     visit_type_str(v, name, &value, &local_err);
1832     if (local_err) {
1833         error_propagate(errp, local_err);
1834         return;
1835     }
1836
1837     prop->set(obj, value, errp);
1838     g_free(value);
1839 }
1840
1841 static void property_release_str(Object *obj, const char *name,
1842                                  void *opaque)
1843 {
1844     StringProperty *prop = opaque;
1845     g_free(prop);
1846 }
1847
1848 void object_property_add_str(Object *obj, const char *name,
1849                            char *(*get)(Object *, Error **),
1850                            void (*set)(Object *, const char *, Error **),
1851                            Error **errp)
1852 {
1853     Error *local_err = NULL;
1854     StringProperty *prop = g_malloc0(sizeof(*prop));
1855
1856     prop->get = get;
1857     prop->set = set;
1858
1859     object_property_add(obj, name, "string",
1860                         get ? property_get_str : NULL,
1861                         set ? property_set_str : NULL,
1862                         property_release_str,
1863                         prop, &local_err);
1864     if (local_err) {
1865         error_propagate(errp, local_err);
1866         g_free(prop);
1867     }
1868 }
1869
1870 void object_class_property_add_str(ObjectClass *klass, const char *name,
1871                                    char *(*get)(Object *, Error **),
1872                                    void (*set)(Object *, const char *,
1873                                                Error **),
1874                                    Error **errp)
1875 {
1876     Error *local_err = NULL;
1877     StringProperty *prop = g_malloc0(sizeof(*prop));
1878
1879     prop->get = get;
1880     prop->set = set;
1881
1882     object_class_property_add(klass, name, "string",
1883                               get ? property_get_str : NULL,
1884                               set ? property_set_str : NULL,
1885                               property_release_str,
1886                               prop, &local_err);
1887     if (local_err) {
1888         error_propagate(errp, local_err);
1889         g_free(prop);
1890     }
1891 }
1892
1893 typedef struct BoolProperty
1894 {
1895     bool (*get)(Object *, Error **);
1896     void (*set)(Object *, bool, Error **);
1897 } BoolProperty;
1898
1899 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1900                               void *opaque, Error **errp)
1901 {
1902     BoolProperty *prop = opaque;
1903     bool value;
1904     Error *err = NULL;
1905
1906     value = prop->get(obj, &err);
1907     if (err) {
1908         error_propagate(errp, err);
1909         return;
1910     }
1911
1912     visit_type_bool(v, name, &value, errp);
1913 }
1914
1915 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1916                               void *opaque, Error **errp)
1917 {
1918     BoolProperty *prop = opaque;
1919     bool value;
1920     Error *local_err = NULL;
1921
1922     visit_type_bool(v, name, &value, &local_err);
1923     if (local_err) {
1924         error_propagate(errp, local_err);
1925         return;
1926     }
1927
1928     prop->set(obj, value, errp);
1929 }
1930
1931 static void property_release_bool(Object *obj, const char *name,
1932                                   void *opaque)
1933 {
1934     BoolProperty *prop = opaque;
1935     g_free(prop);
1936 }
1937
1938 void object_property_add_bool(Object *obj, const char *name,
1939                               bool (*get)(Object *, Error **),
1940                               void (*set)(Object *, bool, Error **),
1941                               Error **errp)
1942 {
1943     Error *local_err = NULL;
1944     BoolProperty *prop = g_malloc0(sizeof(*prop));
1945
1946     prop->get = get;
1947     prop->set = set;
1948
1949     object_property_add(obj, name, "bool",
1950                         get ? property_get_bool : NULL,
1951                         set ? property_set_bool : NULL,
1952                         property_release_bool,
1953                         prop, &local_err);
1954     if (local_err) {
1955         error_propagate(errp, local_err);
1956         g_free(prop);
1957     }
1958 }
1959
1960 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1961                                     bool (*get)(Object *, Error **),
1962                                     void (*set)(Object *, bool, Error **),
1963                                     Error **errp)
1964 {
1965     Error *local_err = NULL;
1966     BoolProperty *prop = g_malloc0(sizeof(*prop));
1967
1968     prop->get = get;
1969     prop->set = set;
1970
1971     object_class_property_add(klass, name, "bool",
1972                               get ? property_get_bool : NULL,
1973                               set ? property_set_bool : NULL,
1974                               property_release_bool,
1975                               prop, &local_err);
1976     if (local_err) {
1977         error_propagate(errp, local_err);
1978         g_free(prop);
1979     }
1980 }
1981
1982 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1983                               void *opaque, Error **errp)
1984 {
1985     EnumProperty *prop = opaque;
1986     int value;
1987     Error *err = NULL;
1988
1989     value = prop->get(obj, &err);
1990     if (err) {
1991         error_propagate(errp, err);
1992         return;
1993     }
1994
1995     visit_type_enum(v, name, &value, prop->lookup, errp);
1996 }
1997
1998 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1999                               void *opaque, Error **errp)
2000 {
2001     EnumProperty *prop = opaque;
2002     int value;
2003     Error *err = NULL;
2004
2005     visit_type_enum(v, name, &value, prop->lookup, &err);
2006     if (err) {
2007         error_propagate(errp, err);
2008         return;
2009     }
2010     prop->set(obj, value, errp);
2011 }
2012
2013 static void property_release_enum(Object *obj, const char *name,
2014                                   void *opaque)
2015 {
2016     EnumProperty *prop = opaque;
2017     g_free(prop);
2018 }
2019
2020 void object_property_add_enum(Object *obj, const char *name,
2021                               const char *typename,
2022                               const QEnumLookup *lookup,
2023                               int (*get)(Object *, Error **),
2024                               void (*set)(Object *, int, Error **),
2025                               Error **errp)
2026 {
2027     Error *local_err = NULL;
2028     EnumProperty *prop = g_malloc(sizeof(*prop));
2029
2030     prop->lookup = lookup;
2031     prop->get = get;
2032     prop->set = set;
2033
2034     object_property_add(obj, name, typename,
2035                         get ? property_get_enum : NULL,
2036                         set ? property_set_enum : NULL,
2037                         property_release_enum,
2038                         prop, &local_err);
2039     if (local_err) {
2040         error_propagate(errp, local_err);
2041         g_free(prop);
2042     }
2043 }
2044
2045 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2046                                     const char *typename,
2047                                     const QEnumLookup *lookup,
2048                                     int (*get)(Object *, Error **),
2049                                     void (*set)(Object *, int, Error **),
2050                                     Error **errp)
2051 {
2052     Error *local_err = NULL;
2053     EnumProperty *prop = g_malloc(sizeof(*prop));
2054
2055     prop->lookup = lookup;
2056     prop->get = get;
2057     prop->set = set;
2058
2059     object_class_property_add(klass, name, typename,
2060                               get ? property_get_enum : NULL,
2061                               set ? property_set_enum : NULL,
2062                               property_release_enum,
2063                               prop, &local_err);
2064     if (local_err) {
2065         error_propagate(errp, local_err);
2066         g_free(prop);
2067     }
2068 }
2069
2070 typedef struct TMProperty {
2071     void (*get)(Object *, struct tm *, Error **);
2072 } TMProperty;
2073
2074 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2075                             void *opaque, Error **errp)
2076 {
2077     TMProperty *prop = opaque;
2078     Error *err = NULL;
2079     struct tm value;
2080
2081     prop->get(obj, &value, &err);
2082     if (err) {
2083         goto out;
2084     }
2085
2086     visit_start_struct(v, name, NULL, 0, &err);
2087     if (err) {
2088         goto out;
2089     }
2090     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2091     if (err) {
2092         goto out_end;
2093     }
2094     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2095     if (err) {
2096         goto out_end;
2097     }
2098     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2099     if (err) {
2100         goto out_end;
2101     }
2102     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2103     if (err) {
2104         goto out_end;
2105     }
2106     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2107     if (err) {
2108         goto out_end;
2109     }
2110     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2111     if (err) {
2112         goto out_end;
2113     }
2114     visit_check_struct(v, &err);
2115 out_end:
2116     visit_end_struct(v, NULL);
2117 out:
2118     error_propagate(errp, err);
2119
2120 }
2121
2122 static void property_release_tm(Object *obj, const char *name,
2123                                 void *opaque)
2124 {
2125     TMProperty *prop = opaque;
2126     g_free(prop);
2127 }
2128
2129 void object_property_add_tm(Object *obj, const char *name,
2130                             void (*get)(Object *, struct tm *, Error **),
2131                             Error **errp)
2132 {
2133     Error *local_err = NULL;
2134     TMProperty *prop = g_malloc0(sizeof(*prop));
2135
2136     prop->get = get;
2137
2138     object_property_add(obj, name, "struct tm",
2139                         get ? property_get_tm : NULL, NULL,
2140                         property_release_tm,
2141                         prop, &local_err);
2142     if (local_err) {
2143         error_propagate(errp, local_err);
2144         g_free(prop);
2145     }
2146 }
2147
2148 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2149                                   void (*get)(Object *, struct tm *, Error **),
2150                                   Error **errp)
2151 {
2152     Error *local_err = NULL;
2153     TMProperty *prop = g_malloc0(sizeof(*prop));
2154
2155     prop->get = get;
2156
2157     object_class_property_add(klass, name, "struct tm",
2158                               get ? property_get_tm : NULL, NULL,
2159                               property_release_tm,
2160                               prop, &local_err);
2161     if (local_err) {
2162         error_propagate(errp, local_err);
2163         g_free(prop);
2164     }
2165 }
2166
2167 static char *qdev_get_type(Object *obj, Error **errp)
2168 {
2169     return g_strdup(object_get_typename(obj));
2170 }
2171
2172 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2173                                    void *opaque, Error **errp)
2174 {
2175     uint8_t value = *(uint8_t *)opaque;
2176     visit_type_uint8(v, name, &value, errp);
2177 }
2178
2179 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2180                                     void *opaque, Error **errp)
2181 {
2182     uint16_t value = *(uint16_t *)opaque;
2183     visit_type_uint16(v, name, &value, errp);
2184 }
2185
2186 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2187                                     void *opaque, Error **errp)
2188 {
2189     uint32_t value = *(uint32_t *)opaque;
2190     visit_type_uint32(v, name, &value, errp);
2191 }
2192
2193 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2194                                     void *opaque, Error **errp)
2195 {
2196     uint64_t value = *(uint64_t *)opaque;
2197     visit_type_uint64(v, name, &value, errp);
2198 }
2199
2200 void object_property_add_uint8_ptr(Object *obj, const char *name,
2201                                    const uint8_t *v, Error **errp)
2202 {
2203     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2204                         NULL, NULL, (void *)v, errp);
2205 }
2206
2207 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2208                                          const uint8_t *v, Error **errp)
2209 {
2210     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2211                               NULL, NULL, (void *)v, errp);
2212 }
2213
2214 void object_property_add_uint16_ptr(Object *obj, const char *name,
2215                                     const uint16_t *v, Error **errp)
2216 {
2217     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2218                         NULL, NULL, (void *)v, errp);
2219 }
2220
2221 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2222                                           const uint16_t *v, Error **errp)
2223 {
2224     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2225                               NULL, NULL, (void *)v, errp);
2226 }
2227
2228 void object_property_add_uint32_ptr(Object *obj, const char *name,
2229                                     const uint32_t *v, Error **errp)
2230 {
2231     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2232                         NULL, NULL, (void *)v, errp);
2233 }
2234
2235 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2236                                           const uint32_t *v, Error **errp)
2237 {
2238     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2239                               NULL, NULL, (void *)v, errp);
2240 }
2241
2242 void object_property_add_uint64_ptr(Object *obj, const char *name,
2243                                     const uint64_t *v, Error **errp)
2244 {
2245     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2246                         NULL, NULL, (void *)v, errp);
2247 }
2248
2249 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2250                                           const uint64_t *v, Error **errp)
2251 {
2252     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2253                               NULL, NULL, (void *)v, errp);
2254 }
2255
2256 typedef struct {
2257     Object *target_obj;
2258     char *target_name;
2259 } AliasProperty;
2260
2261 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2262                                void *opaque, Error **errp)
2263 {
2264     AliasProperty *prop = opaque;
2265
2266     object_property_get(prop->target_obj, v, prop->target_name, errp);
2267 }
2268
2269 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2270                                void *opaque, Error **errp)
2271 {
2272     AliasProperty *prop = opaque;
2273
2274     object_property_set(prop->target_obj, v, prop->target_name, errp);
2275 }
2276
2277 static Object *property_resolve_alias(Object *obj, void *opaque,
2278                                       const gchar *part)
2279 {
2280     AliasProperty *prop = opaque;
2281
2282     return object_resolve_path_component(prop->target_obj, prop->target_name);
2283 }
2284
2285 static void property_release_alias(Object *obj, const char *name, void *opaque)
2286 {
2287     AliasProperty *prop = opaque;
2288
2289     g_free(prop->target_name);
2290     g_free(prop);
2291 }
2292
2293 void object_property_add_alias(Object *obj, const char *name,
2294                                Object *target_obj, const char *target_name,
2295                                Error **errp)
2296 {
2297     AliasProperty *prop;
2298     ObjectProperty *op;
2299     ObjectProperty *target_prop;
2300     gchar *prop_type;
2301     Error *local_err = NULL;
2302
2303     target_prop = object_property_find(target_obj, target_name, errp);
2304     if (!target_prop) {
2305         return;
2306     }
2307
2308     if (object_property_is_child(target_prop)) {
2309         prop_type = g_strdup_printf("link%s",
2310                                     target_prop->type + strlen("child"));
2311     } else {
2312         prop_type = g_strdup(target_prop->type);
2313     }
2314
2315     prop = g_malloc(sizeof(*prop));
2316     prop->target_obj = target_obj;
2317     prop->target_name = g_strdup(target_name);
2318
2319     op = object_property_add(obj, name, prop_type,
2320                              property_get_alias,
2321                              property_set_alias,
2322                              property_release_alias,
2323                              prop, &local_err);
2324     if (local_err) {
2325         error_propagate(errp, local_err);
2326         g_free(prop);
2327         goto out;
2328     }
2329     op->resolve = property_resolve_alias;
2330
2331     object_property_set_description(obj, op->name,
2332                                     target_prop->description,
2333                                     &error_abort);
2334
2335 out:
2336     g_free(prop_type);
2337 }
2338
2339 void object_property_set_description(Object *obj, const char *name,
2340                                      const char *description, Error **errp)
2341 {
2342     ObjectProperty *op;
2343
2344     op = object_property_find(obj, name, errp);
2345     if (!op) {
2346         return;
2347     }
2348
2349     g_free(op->description);
2350     op->description = g_strdup(description);
2351 }
2352
2353 void object_class_property_set_description(ObjectClass *klass,
2354                                            const char *name,
2355                                            const char *description,
2356                                            Error **errp)
2357 {
2358     ObjectProperty *op;
2359
2360     op = g_hash_table_lookup(klass->properties, name);
2361     if (!op) {
2362         error_setg(errp, "Property '.%s' not found", name);
2363         return;
2364     }
2365
2366     g_free(op->description);
2367     op->description = g_strdup(description);
2368 }
2369
2370 static void object_instance_init(Object *obj)
2371 {
2372     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2373 }
2374
2375 static void register_types(void)
2376 {
2377     static TypeInfo interface_info = {
2378         .name = TYPE_INTERFACE,
2379         .class_size = sizeof(InterfaceClass),
2380         .abstract = true,
2381     };
2382
2383     static TypeInfo object_info = {
2384         .name = TYPE_OBJECT,
2385         .instance_size = sizeof(Object),
2386         .instance_init = object_instance_init,
2387         .abstract = true,
2388     };
2389
2390     type_interface = type_register_internal(&interface_info);
2391     type_register_internal(&object_info);
2392 }
2393
2394 type_init(register_types)