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/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     if (type_is_ancestor(ti, type_interface)) {
 290         assert(ti->instance_size == 0);
 291         assert(ti->abstract);
 292         assert(!ti->instance_init);
 293         assert(!ti->instance_post_init);
 294         assert(!ti->instance_finalize);
 295         assert(!ti->num_interfaces);
 296     }
 297     ti->class = g_malloc0(ti->class_size);
 298
 299     parent = type_get_parent(ti);
 300     if (parent) {
 301         type_initialize(parent);
 302         GSList *e;
 303         int i;
 304
 305         g_assert(parent->class_size <= ti->class_size);
 306         memcpy(ti->class, parent->class, parent->class_size);
 307         ti->class->interfaces = NULL;
 308         ti->class->properties = g_hash_table_new_full(
 309             g_str_hash, g_str_equal, g_free, object_property_free);
 310
 311         for (e = parent->class->interfaces; e; e = e->next) {
 312             InterfaceClass *iface = e->data;
 313             ObjectClass *klass = OBJECT_CLASS(iface);
 314
 315             type_initialize_interface(ti, iface->interface_type, klass->type);
 316         }
 317
 318         for (i = 0; i < ti->num_interfaces; i++) {
 319             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 320             for (e = ti->class->interfaces; e; e = e->next) {
 321                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 322
 323                 if (type_is_ancestor(target_type, t)) {
 324                     break;
 325                 }
 326             }
 327
 328             if (e) {
 329                 continue;
 330             }
 331
 332             type_initialize_interface(ti, t, t);
 333         }
 334     } else {
 335         ti->class->properties = g_hash_table_new_full(
 336             g_str_hash, g_str_equal, g_free, object_property_free);
 337     }
 338
 339     ti->class->type = ti;
 340
 341     while (parent) {
 342         if (parent->class_base_init) {
 343             parent->class_base_init(ti->class, ti->class_data);
 344         }
 345         parent = type_get_parent(parent);
 346     }
 347
 348     if (ti->class_init) {
 349         ti->class_init(ti->class, ti->class_data);
 350     }
 351 }
 352
 353 static void object_init_with_type(Object *obj, TypeImpl *ti)
 354 {
 355     if (type_has_parent(ti)) {
 356         object_init_with_type(obj, type_get_parent(ti));
 357     }
 358
 359     if (ti->instance_init) {
 360         ti->instance_init(obj);
 361     }
 362 }
 363
 364 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 365 {
 366     if (ti->instance_post_init) {
 367         ti->instance_post_init(obj);
 368     }
 369
 370     if (type_has_parent(ti)) {
 371         object_post_init_with_type(obj, type_get_parent(ti));
 372     }
 373 }
 374
 375 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 376 {
 377     Object *obj = data;
 378
 379     g_assert(type != NULL);
 380     type_initialize(type);
 381
 382     g_assert(type->instance_size >= sizeof(Object));
 383     g_assert(type->abstract == false);
 384     g_assert(size >= type->instance_size);
 385
 386     memset(obj, 0, type->instance_size);
 387     obj->class = type->class;
 388     object_ref(obj);
 389     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 390                                             NULL, object_property_free);
 391     object_init_with_type(obj, type);
 392     object_post_init_with_type(obj, type);
 393 }
 394
 395 void object_initialize(void *data, size_t size, const char *typename)
 396 {
 397     TypeImpl *type = type_get_by_name(typename);
 398
 399     object_initialize_with_type(data, size, type);
 400 }
 401
 402 void object_initialize_child(Object *parentobj, const char *propname,
 403                              void *childobj, size_t size, const char *type,
 404                              Error **errp, ...)
 405 {
 406     va_list vargs;
 407
 408     va_start(vargs, errp);
 409     object_initialize_childv(parentobj, propname, childobj, size, type, errp,
 410                              vargs);
 411     va_end(vargs);
 412 }
 413
 414 void object_initialize_childv(Object *parentobj, const char *propname,
 415                               void *childobj, size_t size, const char *type,
 416                               Error **errp, va_list vargs)
 417 {
 418     Error *local_err = NULL;
 419     Object *obj;
 420
 421     object_initialize(childobj, size, type);
 422     obj = OBJECT(childobj);
 423
 424     object_set_propv(obj, &local_err, vargs);
 425     if (local_err) {
 426         goto out;
 427     }
 428
 429     object_property_add_child(parentobj, propname, obj, &local_err);
 430     if (local_err) {
 431         goto out;
 432     }
 433
 434     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 435         user_creatable_complete(obj, &local_err);
 436         if (local_err) {
 437             object_unparent(obj);
 438             goto out;
 439         }
 440     }
 441
 442     /*
 443      * Since object_property_add_child added a reference to the child object,
 444      * we can drop the reference added by object_initialize(), so the child
 445      * property will own the only reference to the object.
 446      */
 447     object_unref(obj);
 448
 449 out:
 450     if (local_err) {
 451         error_propagate(errp, local_err);
 452         object_unref(obj);
 453     }
 454 }
 455
 456 static inline bool object_property_is_child(ObjectProperty *prop)
 457 {
 458     return strstart(prop->type, "child<", NULL);
 459 }
 460
 461 static void object_property_del_all(Object *obj)
 462 {
 463     ObjectProperty *prop;
 464     GHashTableIter iter;
 465     gpointer key, value;
 466     bool released;
 467
 468     do {
 469         released = false;
 470         g_hash_table_iter_init(&iter, obj->properties);
 471         while (g_hash_table_iter_next(&iter, &key, &value)) {
 472             prop = value;
 473             if (prop->release) {
 474                 prop->release(obj, prop->name, prop->opaque);
 475                 prop->release = NULL;
 476                 released = true;
 477                 break;
 478             }
 479             g_hash_table_iter_remove(&iter);
 480         }
 481     } while (released);
 482
 483     g_hash_table_unref(obj->properties);
 484 }
 485
 486 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 487 {
 488     ObjectProperty *prop;
 489     GHashTableIter iter;
 490     gpointer key, value;
 491
 492     g_hash_table_iter_init(&iter, obj->properties);
 493     while (g_hash_table_iter_next(&iter, &key, &value)) {
 494         prop = value;
 495         if (object_property_is_child(prop) && prop->opaque == child) {
 496             if (prop->release) {
 497                 prop->release(obj, prop->name, prop->opaque);
 498                 prop->release = NULL;
 499             }
 500             break;
 501         }
 502     }
 503     g_hash_table_iter_init(&iter, obj->properties);
 504     while (g_hash_table_iter_next(&iter, &key, &value)) {
 505         prop = value;
 506         if (object_property_is_child(prop) && prop->opaque == child) {
 507             g_hash_table_iter_remove(&iter);
 508             break;
 509         }
 510     }
 511 }
 512
 513 void object_unparent(Object *obj)
 514 {
 515     if (obj->parent) {
 516         object_property_del_child(obj->parent, obj, NULL);
 517     }
 518 }
 519
 520 static void object_deinit(Object *obj, TypeImpl *type)
 521 {
 522     if (type->instance_finalize) {
 523         type->instance_finalize(obj);
 524     }
 525
 526     if (type_has_parent(type)) {
 527         object_deinit(obj, type_get_parent(type));
 528     }
 529 }
 530
 531 static void object_finalize(void *data)
 532 {
 533     Object *obj = data;
 534     TypeImpl *ti = obj->class->type;
 535
 536     object_property_del_all(obj);
 537     object_deinit(obj, ti);
 538
 539     g_assert(obj->ref == 0);
 540     if (obj->free) {
 541         obj->free(obj);
 542     }
 543 }
 544
 545 static Object *object_new_with_type(Type type)
 546 {
 547     Object *obj;
 548
 549     g_assert(type != NULL);
 550     type_initialize(type);
 551
 552     obj = g_malloc(type->instance_size);
 553     object_initialize_with_type(obj, type->instance_size, type);
 554     obj->free = g_free;
 555
 556     return obj;
 557 }
 558
 559 Object *object_new(const char *typename)
 560 {
 561     TypeImpl *ti = type_get_by_name(typename);
 562
 563     return object_new_with_type(ti);
 564 }
 565
 566
 567 Object *object_new_with_props(const char *typename,
 568                               Object *parent,
 569                               const char *id,
 570                               Error **errp,
 571                               ...)
 572 {
 573     va_list vargs;
 574     Object *obj;
 575
 576     va_start(vargs, errp);
 577     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 578     va_end(vargs);
 579
 580     return obj;
 581 }
 582
 583
 584 Object *object_new_with_propv(const char *typename,
 585                               Object *parent,
 586                               const char *id,
 587                               Error **errp,
 588                               va_list vargs)
 589 {
 590     Object *obj;
 591     ObjectClass *klass;
 592     Error *local_err = NULL;
 593
 594     klass = object_class_by_name(typename);
 595     if (!klass) {
 596         error_setg(errp, "invalid object type: %s", typename);
 597         return NULL;
 598     }
 599
 600     if (object_class_is_abstract(klass)) {
 601         error_setg(errp, "object type '%s' is abstract", typename);
 602         return NULL;
 603     }
 604     obj = object_new(typename);
 605
 606     if (object_set_propv(obj, &local_err, vargs) < 0) {
 607         goto error;
 608     }
 609
 610     object_property_add_child(parent, id, obj, &local_err);
 611     if (local_err) {
 612         goto error;
 613     }
 614
 615     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 616         user_creatable_complete(obj, &local_err);
 617         if (local_err) {
 618             object_unparent(obj);
 619             goto error;
 620         }
 621     }
 622
 623     object_unref(OBJECT(obj));
 624     return obj;
 625
 626  error:
 627     error_propagate(errp, local_err);
 628     object_unref(obj);
 629     return NULL;
 630 }
 631
 632
 633 int object_set_props(Object *obj,
 634                      Error **errp,
 635                      ...)
 636 {
 637     va_list vargs;
 638     int ret;
 639
 640     va_start(vargs, errp);
 641     ret = object_set_propv(obj, errp, vargs);
 642     va_end(vargs);
 643
 644     return ret;
 645 }
 646
 647
 648 int object_set_propv(Object *obj,
 649                      Error **errp,
 650                      va_list vargs)
 651 {
 652     const char *propname;
 653     Error *local_err = NULL;
 654
 655     propname = va_arg(vargs, char *);
 656     while (propname != NULL) {
 657         const char *value = va_arg(vargs, char *);
 658
 659         g_assert(value != NULL);
 660         object_property_parse(obj, value, propname, &local_err);
 661         if (local_err) {
 662             error_propagate(errp, local_err);
 663             return -1;
 664         }
 665         propname = va_arg(vargs, char *);
 666     }
 667
 668     return 0;
 669 }
 670
 671
 672 Object *object_dynamic_cast(Object *obj, const char *typename)
 673 {
 674     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 675         return obj;
 676     }
 677
 678     return NULL;
 679 }
 680
 681 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 682                                    const char *file, int line, const char *func)
 683 {
 684     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 685                                      typename, file, line, func);
 686
 687 #ifdef CONFIG_QOM_CAST_DEBUG
 688     int i;
 689     Object *inst;
 690
 691     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 692         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 693             goto out;
 694         }
 695     }
 696
 697     inst = object_dynamic_cast(obj, typename);
 698
 699     if (!inst && obj) {
 700         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 701                 file, line, func, obj, typename);
 702         abort();
 703     }
 704
 705     assert(obj == inst);
 706
 707     if (obj && obj == inst) {
 708         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 709             atomic_set(&obj->class->object_cast_cache[i - 1],
 710                        atomic_read(&obj->class->object_cast_cache[i]));
 711         }
 712         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 713     }
 714
 715 out:
 716 #endif
 717     return obj;
 718 }
 719
 720 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 721                                        const char *typename)
 722 {
 723     ObjectClass *ret = NULL;
 724     TypeImpl *target_type;
 725     TypeImpl *type;
 726
 727     if (!class) {
 728         return NULL;
 729     }
 730
 731     /* A simple fast path that can trigger a lot for leaf classes.  */
 732     type = class->type;
 733     if (type->name == typename) {
 734         return class;
 735     }
 736
 737     target_type = type_get_by_name(typename);
 738     if (!target_type) {
 739         /* target class type unknown, so fail the cast */
 740         return NULL;
 741     }
 742
 743     if (type->class->interfaces &&
 744             type_is_ancestor(target_type, type_interface)) {
 745         int found = 0;
 746         GSList *i;
 747
 748         for (i = class->interfaces; i; i = i->next) {
 749             ObjectClass *target_class = i->data;
 750
 751             if (type_is_ancestor(target_class->type, target_type)) {
 752                 ret = target_class;
 753                 found++;
 754             }
 755          }
 756
 757         /* The match was ambiguous, don't allow a cast */
 758         if (found > 1) {
 759             ret = NULL;
 760         }
 761     } else if (type_is_ancestor(type, target_type)) {
 762         ret = class;
 763     }
 764
 765     return ret;
 766 }
 767
 768 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 769                                               const char *typename,
 770                                               const char *file, int line,
 771                                               const char *func)
 772 {
 773     ObjectClass *ret;
 774
 775     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 776                                            typename, file, line, func);
 777
 778 #ifdef CONFIG_QOM_CAST_DEBUG
 779     int i;
 780
 781     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 782         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 783             ret = class;
 784             goto out;
 785         }
 786     }
 787 #else
 788     if (!class || !class->interfaces) {
 789         return class;
 790     }
 791 #endif
 792
 793     ret = object_class_dynamic_cast(class, typename);
 794     if (!ret && class) {
 795         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 796                 file, line, func, class, typename);
 797         abort();
 798     }
 799
 800 #ifdef CONFIG_QOM_CAST_DEBUG
 801     if (class && ret == class) {
 802         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 803             atomic_set(&class->class_cast_cache[i - 1],
 804                        atomic_read(&class->class_cast_cache[i]));
 805         }
 806         atomic_set(&class->class_cast_cache[i - 1], typename);
 807     }
 808 out:
 809 #endif
 810     return ret;
 811 }
 812
 813 const char *object_get_typename(const Object *obj)
 814 {
 815     return obj->class->type->name;
 816 }
 817
 818 ObjectClass *object_get_class(Object *obj)
 819 {
 820     return obj->class;
 821 }
 822
 823 bool object_class_is_abstract(ObjectClass *klass)
 824 {
 825     return klass->type->abstract;
 826 }
 827
 828 const char *object_class_get_name(ObjectClass *klass)
 829 {
 830     return klass->type->name;
 831 }
 832
 833 ObjectClass *object_class_by_name(const char *typename)
 834 {
 835     TypeImpl *type = type_get_by_name(typename);
 836
 837     if (!type) {
 838         return NULL;
 839     }
 840
 841     type_initialize(type);
 842
 843     return type->class;
 844 }
 845
 846 ObjectClass *object_class_get_parent(ObjectClass *class)
 847 {
 848     TypeImpl *type = type_get_parent(class->type);
 849
 850     if (!type) {
 851         return NULL;
 852     }
 853
 854     type_initialize(type);
 855
 856     return type->class;
 857 }
 858
 859 typedef struct OCFData
 860 {
 861     void (*fn)(ObjectClass *klass, void *opaque);
 862     const char *implements_type;
 863     bool include_abstract;
 864     void *opaque;
 865 } OCFData;
 866
 867 static void object_class_foreach_tramp(gpointer key, gpointer value,
 868                                        gpointer opaque)
 869 {
 870     OCFData *data = opaque;
 871     TypeImpl *type = value;
 872     ObjectClass *k;
 873
 874     type_initialize(type);
 875     k = type->class;
 876
 877     if (!data->include_abstract && type->abstract) {
 878         return;
 879     }
 880
 881     if (data->implements_type &&
 882         !object_class_dynamic_cast(k, data->implements_type)) {
 883         return;
 884     }
 885
 886     data->fn(k, data->opaque);
 887 }
 888
 889 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 890                           const char *implements_type, bool include_abstract,
 891                           void *opaque)
 892 {
 893     OCFData data = { fn, implements_type, include_abstract, opaque };
 894
 895     enumerating_types = true;
 896     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 897     enumerating_types = false;
 898 }
 899
 900 static int do_object_child_foreach(Object *obj,
 901                                    int (*fn)(Object *child, void *opaque),
 902                                    void *opaque, bool recurse)
 903 {
 904     GHashTableIter iter;
 905     ObjectProperty *prop;
 906     int ret = 0;
 907
 908     g_hash_table_iter_init(&iter, obj->properties);
 909     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 910         if (object_property_is_child(prop)) {
 911             Object *child = prop->opaque;
 912
 913             ret = fn(child, opaque);
 914             if (ret != 0) {
 915                 break;
 916             }
 917             if (recurse) {
 918                 do_object_child_foreach(child, fn, opaque, true);
 919             }
 920         }
 921     }
 922     return ret;
 923 }
 924
 925 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 926                          void *opaque)
 927 {
 928     return do_object_child_foreach(obj, fn, opaque, false);
 929 }
 930
 931 int object_child_foreach_recursive(Object *obj,
 932                                    int (*fn)(Object *child, void *opaque),
 933                                    void *opaque)
 934 {
 935     return do_object_child_foreach(obj, fn, opaque, true);
 936 }
 937
 938 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 939 {
 940     GSList **list = opaque;
 941
 942     *list = g_slist_prepend(*list, klass);
 943 }
 944
 945 GSList *object_class_get_list(const char *implements_type,
 946                               bool include_abstract)
 947 {
 948     GSList *list = NULL;
 949
 950     object_class_foreach(object_class_get_list_tramp,
 951                          implements_type, include_abstract, &list);
 952     return list;
 953 }
 954
 955 static gint object_class_cmp(gconstpointer a, gconstpointer b)
 956 {
 957     return strcasecmp(object_class_get_name((ObjectClass *)a),
 958                       object_class_get_name((ObjectClass *)b));
 959 }
 960
 961 GSList *object_class_get_list_sorted(const char *implements_type,
 962                                      bool include_abstract)
 963 {
 964     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
 965                         object_class_cmp);
 966 }
 967
 968 void object_ref(Object *obj)
 969 {
 970     if (!obj) {
 971         return;
 972     }
 973     atomic_inc(&obj->ref);
 974 }
 975
 976 void object_unref(Object *obj)
 977 {
 978     if (!obj) {
 979         return;
 980     }
 981     g_assert(obj->ref > 0);
 982
 983     /* parent always holds a reference to its children */
 984     if (atomic_fetch_dec(&obj->ref) == 1) {
 985         object_finalize(obj);
 986     }
 987 }
 988
 989 ObjectProperty *
 990 object_property_add(Object *obj, const char *name, const char *type,
 991                     ObjectPropertyAccessor *get,
 992                     ObjectPropertyAccessor *set,
 993                     ObjectPropertyRelease *release,
 994                     void *opaque, Error **errp)
 995 {
 996     ObjectProperty *prop;
 997     size_t name_len = strlen(name);
 998
 999     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1000         int i;
1001         ObjectProperty *ret;
1002         char *name_no_array = g_strdup(name);
1003
1004         name_no_array[name_len - 3] = '\0';
1005         for (i = 0; ; ++i) {
1006             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1007
1008             ret = object_property_add(obj, full_name, type, get, set,
1009                                       release, opaque, NULL);
1010             g_free(full_name);
1011             if (ret) {
1012                 break;
1013             }
1014         }
1015         g_free(name_no_array);
1016         return ret;
1017     }
1018
1019     if (object_property_find(obj, name, NULL) != NULL) {
1020         error_setg(errp, "attempt to add duplicate property '%s'"
1021                    " to object (type '%s')", name,
1022                    object_get_typename(obj));
1023         return NULL;
1024     }
1025
1026     prop = g_malloc0(sizeof(*prop));
1027
1028     prop->name = g_strdup(name);
1029     prop->type = g_strdup(type);
1030
1031     prop->get = get;
1032     prop->set = set;
1033     prop->release = release;
1034     prop->opaque = opaque;
1035
1036     g_hash_table_insert(obj->properties, prop->name, prop);
1037     return prop;
1038 }
1039
1040 ObjectProperty *
1041 object_class_property_add(ObjectClass *klass,
1042                           const char *name,
1043                           const char *type,
1044                           ObjectPropertyAccessor *get,
1045                           ObjectPropertyAccessor *set,
1046                           ObjectPropertyRelease *release,
1047                           void *opaque,
1048                           Error **errp)
1049 {
1050     ObjectProperty *prop;
1051
1052     if (object_class_property_find(klass, name, NULL) != NULL) {
1053         error_setg(errp, "attempt to add duplicate property '%s'"
1054                    " to object (type '%s')", name,
1055                    object_class_get_name(klass));
1056         return NULL;
1057     }
1058
1059     prop = g_malloc0(sizeof(*prop));
1060
1061     prop->name = g_strdup(name);
1062     prop->type = g_strdup(type);
1063
1064     prop->get = get;
1065     prop->set = set;
1066     prop->release = release;
1067     prop->opaque = opaque;
1068
1069     g_hash_table_insert(klass->properties, g_strdup(name), prop);
1070
1071     return prop;
1072 }
1073
1074 ObjectProperty *object_property_find(Object *obj, const char *name,
1075                                      Error **errp)
1076 {
1077     ObjectProperty *prop;
1078     ObjectClass *klass = object_get_class(obj);
1079
1080     prop = object_class_property_find(klass, name, NULL);
1081     if (prop) {
1082         return prop;
1083     }
1084
1085     prop = g_hash_table_lookup(obj->properties, name);
1086     if (prop) {
1087         return prop;
1088     }
1089
1090     error_setg(errp, "Property '.%s' not found", name);
1091     return NULL;
1092 }
1093
1094 void object_property_iter_init(ObjectPropertyIterator *iter,
1095                                Object *obj)
1096 {
1097     g_hash_table_iter_init(&iter->iter, obj->properties);
1098     iter->nextclass = object_get_class(obj);
1099 }
1100
1101 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1102 {
1103     gpointer key, val;
1104     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1105         if (!iter->nextclass) {
1106             return NULL;
1107         }
1108         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1109         iter->nextclass = object_class_get_parent(iter->nextclass);
1110     }
1111     return val;
1112 }
1113
1114 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1115                                      ObjectClass *klass)
1116 {
1117     g_hash_table_iter_init(&iter->iter, klass->properties);
1118     iter->nextclass = object_class_get_parent(klass);
1119 }
1120
1121 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1122                                            Error **errp)
1123 {
1124     ObjectProperty *prop;
1125     ObjectClass *parent_klass;
1126
1127     parent_klass = object_class_get_parent(klass);
1128     if (parent_klass) {
1129         prop = object_class_property_find(parent_klass, name, NULL);
1130         if (prop) {
1131             return prop;
1132         }
1133     }
1134
1135     prop = g_hash_table_lookup(klass->properties, name);
1136     if (!prop) {
1137         error_setg(errp, "Property '.%s' not found", name);
1138     }
1139     return prop;
1140 }
1141
1142 void object_property_del(Object *obj, const char *name, Error **errp)
1143 {
1144     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1145
1146     if (!prop) {
1147         error_setg(errp, "Property '.%s' not found", name);
1148         return;
1149     }
1150
1151     if (prop->release) {
1152         prop->release(obj, name, prop->opaque);
1153     }
1154     g_hash_table_remove(obj->properties, name);
1155 }
1156
1157 void object_property_get(Object *obj, Visitor *v, const char *name,
1158                          Error **errp)
1159 {
1160     ObjectProperty *prop = object_property_find(obj, name, errp);
1161     if (prop == NULL) {
1162         return;
1163     }
1164
1165     if (!prop->get) {
1166         error_setg(errp, QERR_PERMISSION_DENIED);
1167     } else {
1168         prop->get(obj, v, name, prop->opaque, errp);
1169     }
1170 }
1171
1172 void object_property_set(Object *obj, Visitor *v, const char *name,
1173                          Error **errp)
1174 {
1175     ObjectProperty *prop = object_property_find(obj, name, errp);
1176     if (prop == NULL) {
1177         return;
1178     }
1179
1180     if (!prop->set) {
1181         error_setg(errp, QERR_PERMISSION_DENIED);
1182     } else {
1183         prop->set(obj, v, name, prop->opaque, errp);
1184     }
1185 }
1186
1187 void object_property_set_str(Object *obj, const char *value,
1188                              const char *name, Error **errp)
1189 {
1190     QString *qstr = qstring_from_str(value);
1191     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1192
1193     qobject_unref(qstr);
1194 }
1195
1196 char *object_property_get_str(Object *obj, const char *name,
1197                               Error **errp)
1198 {
1199     QObject *ret = object_property_get_qobject(obj, name, errp);
1200     char *retval;
1201
1202     if (!ret) {
1203         return NULL;
1204     }
1205
1206     retval = g_strdup(qobject_get_try_str(ret));
1207     if (!retval) {
1208         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1209     }
1210
1211     qobject_unref(ret);
1212     return retval;
1213 }
1214
1215 void object_property_set_link(Object *obj, Object *value,
1216                               const char *name, Error **errp)
1217 {
1218     if (value) {
1219         gchar *path = object_get_canonical_path(value);
1220         object_property_set_str(obj, path, name, errp);
1221         g_free(path);
1222     } else {
1223         object_property_set_str(obj, "", name, errp);
1224     }
1225 }
1226
1227 Object *object_property_get_link(Object *obj, const char *name,
1228                                  Error **errp)
1229 {
1230     char *str = object_property_get_str(obj, name, errp);
1231     Object *target = NULL;
1232
1233     if (str && *str) {
1234         target = object_resolve_path(str, NULL);
1235         if (!target) {
1236             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1237                       "Device '%s' not found", str);
1238         }
1239     }
1240
1241     g_free(str);
1242     return target;
1243 }
1244
1245 void object_property_set_bool(Object *obj, bool value,
1246                               const char *name, Error **errp)
1247 {
1248     QBool *qbool = qbool_from_bool(value);
1249     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1250
1251     qobject_unref(qbool);
1252 }
1253
1254 bool object_property_get_bool(Object *obj, const char *name,
1255                               Error **errp)
1256 {
1257     QObject *ret = object_property_get_qobject(obj, name, errp);
1258     QBool *qbool;
1259     bool retval;
1260
1261     if (!ret) {
1262         return false;
1263     }
1264     qbool = qobject_to(QBool, ret);
1265     if (!qbool) {
1266         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1267         retval = false;
1268     } else {
1269         retval = qbool_get_bool(qbool);
1270     }
1271
1272     qobject_unref(ret);
1273     return retval;
1274 }
1275
1276 void object_property_set_int(Object *obj, int64_t value,
1277                              const char *name, Error **errp)
1278 {
1279     QNum *qnum = qnum_from_int(value);
1280     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1281
1282     qobject_unref(qnum);
1283 }
1284
1285 int64_t object_property_get_int(Object *obj, const char *name,
1286                                 Error **errp)
1287 {
1288     QObject *ret = object_property_get_qobject(obj, name, errp);
1289     QNum *qnum;
1290     int64_t retval;
1291
1292     if (!ret) {
1293         return -1;
1294     }
1295
1296     qnum = qobject_to(QNum, ret);
1297     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1298         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1299         retval = -1;
1300     }
1301
1302     qobject_unref(ret);
1303     return retval;
1304 }
1305
1306 void object_property_set_uint(Object *obj, uint64_t value,
1307                               const char *name, Error **errp)
1308 {
1309     QNum *qnum = qnum_from_uint(value);
1310
1311     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1312     qobject_unref(qnum);
1313 }
1314
1315 uint64_t object_property_get_uint(Object *obj, const char *name,
1316                                   Error **errp)
1317 {
1318     QObject *ret = object_property_get_qobject(obj, name, errp);
1319     QNum *qnum;
1320     uint64_t retval;
1321
1322     if (!ret) {
1323         return 0;
1324     }
1325     qnum = qobject_to(QNum, ret);
1326     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1327         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1328         retval = 0;
1329     }
1330
1331     qobject_unref(ret);
1332     return retval;
1333 }
1334
1335 typedef struct EnumProperty {
1336     const QEnumLookup *lookup;
1337     int (*get)(Object *, Error **);
1338     void (*set)(Object *, int, Error **);
1339 } EnumProperty;
1340
1341 int object_property_get_enum(Object *obj, const char *name,
1342                              const char *typename, Error **errp)
1343 {
1344     Error *err = NULL;
1345     Visitor *v;
1346     char *str;
1347     int ret;
1348     ObjectProperty *prop = object_property_find(obj, name, errp);
1349     EnumProperty *enumprop;
1350
1351     if (prop == NULL) {
1352         return 0;
1353     }
1354
1355     if (!g_str_equal(prop->type, typename)) {
1356         error_setg(errp, "Property %s on %s is not '%s' enum type",
1357                    name, object_class_get_name(
1358                        object_get_class(obj)), typename);
1359         return 0;
1360     }
1361
1362     enumprop = prop->opaque;
1363
1364     v = string_output_visitor_new(false, &str);
1365     object_property_get(obj, v, name, &err);
1366     if (err) {
1367         error_propagate(errp, err);
1368         visit_free(v);
1369         return 0;
1370     }
1371     visit_complete(v, &str);
1372     visit_free(v);
1373     v = string_input_visitor_new(str);
1374     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1375
1376     g_free(str);
1377     visit_free(v);
1378
1379     return ret;
1380 }
1381
1382 void object_property_get_uint16List(Object *obj, const char *name,
1383                                     uint16List **list, Error **errp)
1384 {
1385     Error *err = NULL;
1386     Visitor *v;
1387     char *str;
1388
1389     v = string_output_visitor_new(false, &str);
1390     object_property_get(obj, v, name, &err);
1391     if (err) {
1392         error_propagate(errp, err);
1393         goto out;
1394     }
1395     visit_complete(v, &str);
1396     visit_free(v);
1397     v = string_input_visitor_new(str);
1398     visit_type_uint16List(v, NULL, list, errp);
1399
1400     g_free(str);
1401 out:
1402     visit_free(v);
1403 }
1404
1405 void object_property_parse(Object *obj, const char *string,
1406                            const char *name, Error **errp)
1407 {
1408     Visitor *v = string_input_visitor_new(string);
1409     object_property_set(obj, v, name, errp);
1410     visit_free(v);
1411 }
1412
1413 char *object_property_print(Object *obj, const char *name, bool human,
1414                             Error **errp)
1415 {
1416     Visitor *v;
1417     char *string = NULL;
1418     Error *local_err = NULL;
1419
1420     v = string_output_visitor_new(human, &string);
1421     object_property_get(obj, v, name, &local_err);
1422     if (local_err) {
1423         error_propagate(errp, local_err);
1424         goto out;
1425     }
1426
1427     visit_complete(v, &string);
1428
1429 out:
1430     visit_free(v);
1431     return string;
1432 }
1433
1434 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1435 {
1436     ObjectProperty *prop = object_property_find(obj, name, errp);
1437     if (prop == NULL) {
1438         return NULL;
1439     }
1440
1441     return prop->type;
1442 }
1443
1444 Object *object_get_root(void)
1445 {
1446     static Object *root;
1447
1448     if (!root) {
1449         root = object_new("container");
1450     }
1451
1452     return root;
1453 }
1454
1455 Object *object_get_objects_root(void)
1456 {
1457     return container_get(object_get_root(), "/objects");
1458 }
1459
1460 Object *object_get_internal_root(void)
1461 {
1462     static Object *internal_root;
1463
1464     if (!internal_root) {
1465         internal_root = object_new("container");
1466     }
1467
1468     return internal_root;
1469 }
1470
1471 static void object_get_child_property(Object *obj, Visitor *v,
1472                                       const char *name, void *opaque,
1473                                       Error **errp)
1474 {
1475     Object *child = opaque;
1476     gchar *path;
1477
1478     path = object_get_canonical_path(child);
1479     visit_type_str(v, name, &path, errp);
1480     g_free(path);
1481 }
1482
1483 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1484 {
1485     return opaque;
1486 }
1487
1488 static void object_finalize_child_property(Object *obj, const char *name,
1489                                            void *opaque)
1490 {
1491     Object *child = opaque;
1492
1493     if (child->class->unparent) {
1494         (child->class->unparent)(child);
1495     }
1496     child->parent = NULL;
1497     object_unref(child);
1498 }
1499
1500 void object_property_add_child(Object *obj, const char *name,
1501                                Object *child, Error **errp)
1502 {
1503     Error *local_err = NULL;
1504     gchar *type;
1505     ObjectProperty *op;
1506
1507     if (child->parent != NULL) {
1508         error_setg(errp, "child object is already parented");
1509         return;
1510     }
1511
1512     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1513
1514     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1515                              object_finalize_child_property, child, &local_err);
1516     if (local_err) {
1517         error_propagate(errp, local_err);
1518         goto out;
1519     }
1520
1521     op->resolve = object_resolve_child_property;
1522     object_ref(child);
1523     child->parent = obj;
1524
1525 out:
1526     g_free(type);
1527 }
1528
1529 void object_property_allow_set_link(const Object *obj, const char *name,
1530                                     Object *val, Error **errp)
1531 {
1532     /* Allow the link to be set, always */
1533 }
1534
1535 typedef struct {
1536     Object **child;
1537     void (*check)(const Object *, const char *, Object *, Error **);
1538     ObjectPropertyLinkFlags flags;
1539 } LinkProperty;
1540
1541 static void object_get_link_property(Object *obj, Visitor *v,
1542                                      const char *name, void *opaque,
1543                                      Error **errp)
1544 {
1545     LinkProperty *lprop = opaque;
1546     Object **child = lprop->child;
1547     gchar *path;
1548
1549     if (*child) {
1550         path = object_get_canonical_path(*child);
1551         visit_type_str(v, name, &path, errp);
1552         g_free(path);
1553     } else {
1554         path = (gchar *)"";
1555         visit_type_str(v, name, &path, errp);
1556     }
1557 }
1558
1559 /*
1560  * object_resolve_link:
1561  *
1562  * Lookup an object and ensure its type matches the link property type.  This
1563  * is similar to object_resolve_path() except type verification against the
1564  * link property is performed.
1565  *
1566  * Returns: The matched object or NULL on path lookup failures.
1567  */
1568 static Object *object_resolve_link(Object *obj, const char *name,
1569                                    const char *path, Error **errp)
1570 {
1571     const char *type;
1572     gchar *target_type;
1573     bool ambiguous = false;
1574     Object *target;
1575
1576     /* Go from link<FOO> to FOO.  */
1577     type = object_property_get_type(obj, name, NULL);
1578     target_type = g_strndup(&type[5], strlen(type) - 6);
1579     target = object_resolve_path_type(path, target_type, &ambiguous);
1580
1581     if (ambiguous) {
1582         error_setg(errp, "Path '%s' does not uniquely identify an object",
1583                    path);
1584     } else if (!target) {
1585         target = object_resolve_path(path, &ambiguous);
1586         if (target || ambiguous) {
1587             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1588         } else {
1589             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1590                       "Device '%s' not found", path);
1591         }
1592         target = NULL;
1593     }
1594     g_free(target_type);
1595
1596     return target;
1597 }
1598
1599 static void object_set_link_property(Object *obj, Visitor *v,
1600                                      const char *name, void *opaque,
1601                                      Error **errp)
1602 {
1603     Error *local_err = NULL;
1604     LinkProperty *prop = opaque;
1605     Object **child = prop->child;
1606     Object *old_target = *child;
1607     Object *new_target = NULL;
1608     char *path = NULL;
1609
1610     visit_type_str(v, name, &path, &local_err);
1611
1612     if (!local_err && strcmp(path, "") != 0) {
1613         new_target = object_resolve_link(obj, name, path, &local_err);
1614     }
1615
1616     g_free(path);
1617     if (local_err) {
1618         error_propagate(errp, local_err);
1619         return;
1620     }
1621
1622     prop->check(obj, name, new_target, &local_err);
1623     if (local_err) {
1624         error_propagate(errp, local_err);
1625         return;
1626     }
1627
1628     *child = new_target;
1629     if (prop->flags == OBJ_PROP_LINK_STRONG) {
1630         object_ref(new_target);
1631         object_unref(old_target);
1632     }
1633 }
1634
1635 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1636 {
1637     LinkProperty *lprop = opaque;
1638
1639     return *lprop->child;
1640 }
1641
1642 static void object_release_link_property(Object *obj, const char *name,
1643                                          void *opaque)
1644 {
1645     LinkProperty *prop = opaque;
1646
1647     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) {
1648         object_unref(*prop->child);
1649     }
1650     g_free(prop);
1651 }
1652
1653 void object_property_add_link(Object *obj, const char *name,
1654                               const char *type, Object **child,
1655                               void (*check)(const Object *, const char *,
1656                                             Object *, Error **),
1657                               ObjectPropertyLinkFlags flags,
1658                               Error **errp)
1659 {
1660     Error *local_err = NULL;
1661     LinkProperty *prop = g_malloc(sizeof(*prop));
1662     gchar *full_type;
1663     ObjectProperty *op;
1664
1665     prop->child = child;
1666     prop->check = check;
1667     prop->flags = flags;
1668
1669     full_type = g_strdup_printf("link<%s>", type);
1670
1671     op = object_property_add(obj, name, full_type,
1672                              object_get_link_property,
1673                              check ? object_set_link_property : NULL,
1674                              object_release_link_property,
1675                              prop,
1676                              &local_err);
1677     if (local_err) {
1678         error_propagate(errp, local_err);
1679         g_free(prop);
1680         goto out;
1681     }
1682
1683     op->resolve = object_resolve_link_property;
1684
1685 out:
1686     g_free(full_type);
1687 }
1688
1689 void object_property_add_const_link(Object *obj, const char *name,
1690                                     Object *target, Error **errp)
1691 {
1692     char *link_type;
1693     ObjectProperty *op;
1694
1695     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1696     op = object_property_add(obj, name, link_type,
1697                              object_get_child_property, NULL,
1698                              NULL, target, errp);
1699     if (op != NULL) {
1700         op->resolve = object_resolve_child_property;
1701     }
1702     g_free(link_type);
1703 }
1704
1705 gchar *object_get_canonical_path_component(Object *obj)
1706 {
1707     ObjectProperty *prop = NULL;
1708     GHashTableIter iter;
1709
1710     if (obj->parent == NULL) {
1711         return NULL;
1712     }
1713
1714     g_hash_table_iter_init(&iter, obj->parent->properties);
1715     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1716         if (!object_property_is_child(prop)) {
1717             continue;
1718         }
1719
1720         if (prop->opaque == obj) {
1721             return g_strdup(prop->name);
1722         }
1723     }
1724
1725     /* obj had a parent but was not a child, should never happen */
1726     g_assert_not_reached();
1727     return NULL;
1728 }
1729
1730 gchar *object_get_canonical_path(Object *obj)
1731 {
1732     Object *root = object_get_root();
1733     char *newpath, *path = NULL;
1734
1735     if (obj == root) {
1736         return g_strdup("/");
1737     }
1738
1739     do {
1740         char *component = object_get_canonical_path_component(obj);
1741
1742         if (!component) {
1743             /* A canonical path must be complete, so discard what was
1744              * collected so far.
1745              */
1746             g_free(path);
1747             return NULL;
1748         }
1749
1750         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1751         g_free(path);
1752         g_free(component);
1753         path = newpath;
1754         obj = obj->parent;
1755     } while (obj != root);
1756
1757     return path;
1758 }
1759
1760 Object *object_resolve_path_component(Object *parent, const gchar *part)
1761 {
1762     ObjectProperty *prop = object_property_find(parent, part, NULL);
1763     if (prop == NULL) {
1764         return NULL;
1765     }
1766
1767     if (prop->resolve) {
1768         return prop->resolve(parent, prop->opaque, part);
1769     } else {
1770         return NULL;
1771     }
1772 }
1773
1774 static Object *object_resolve_abs_path(Object *parent,
1775                                           gchar **parts,
1776                                           const char *typename,
1777                                           int index)
1778 {
1779     Object *child;
1780
1781     if (parts[index] == NULL) {
1782         return object_dynamic_cast(parent, typename);
1783     }
1784
1785     if (strcmp(parts[index], "") == 0) {
1786         return object_resolve_abs_path(parent, parts, typename, index + 1);
1787     }
1788
1789     child = object_resolve_path_component(parent, parts[index]);
1790     if (!child) {
1791         return NULL;
1792     }
1793
1794     return object_resolve_abs_path(child, parts, typename, index + 1);
1795 }
1796
1797 static Object *object_resolve_partial_path(Object *parent,
1798                                               gchar **parts,
1799                                               const char *typename,
1800                                               bool *ambiguous)
1801 {
1802     Object *obj;
1803     GHashTableIter iter;
1804     ObjectProperty *prop;
1805
1806     obj = object_resolve_abs_path(parent, parts, typename, 0);
1807
1808     g_hash_table_iter_init(&iter, parent->properties);
1809     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1810         Object *found;
1811
1812         if (!object_property_is_child(prop)) {
1813             continue;
1814         }
1815
1816         found = object_resolve_partial_path(prop->opaque, parts,
1817                                             typename, ambiguous);
1818         if (found) {
1819             if (obj) {
1820                 *ambiguous = true;
1821                 return NULL;
1822             }
1823             obj = found;
1824         }
1825
1826         if (*ambiguous) {
1827             return NULL;
1828         }
1829     }
1830
1831     return obj;
1832 }
1833
1834 Object *object_resolve_path_type(const char *path, const char *typename,
1835                                  bool *ambiguousp)
1836 {
1837     Object *obj;
1838     gchar **parts;
1839
1840     parts = g_strsplit(path, "/", 0);
1841     assert(parts);
1842
1843     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1844         bool ambiguous = false;
1845         obj = object_resolve_partial_path(object_get_root(), parts,
1846                                           typename, &ambiguous);
1847         if (ambiguousp) {
1848             *ambiguousp = ambiguous;
1849         }
1850     } else {
1851         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1852     }
1853
1854     g_strfreev(parts);
1855
1856     return obj;
1857 }
1858
1859 Object *object_resolve_path(const char *path, bool *ambiguous)
1860 {
1861     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1862 }
1863
1864 typedef struct StringProperty
1865 {
1866     char *(*get)(Object *, Error **);
1867     void (*set)(Object *, const char *, Error **);
1868 } StringProperty;
1869
1870 static void property_get_str(Object *obj, Visitor *v, const char *name,
1871                              void *opaque, Error **errp)
1872 {
1873     StringProperty *prop = opaque;
1874     char *value;
1875     Error *err = NULL;
1876
1877     value = prop->get(obj, &err);
1878     if (err) {
1879         error_propagate(errp, err);
1880         return;
1881     }
1882
1883     visit_type_str(v, name, &value, errp);
1884     g_free(value);
1885 }
1886
1887 static void property_set_str(Object *obj, Visitor *v, const char *name,
1888                              void *opaque, Error **errp)
1889 {
1890     StringProperty *prop = opaque;
1891     char *value;
1892     Error *local_err = NULL;
1893
1894     visit_type_str(v, name, &value, &local_err);
1895     if (local_err) {
1896         error_propagate(errp, local_err);
1897         return;
1898     }
1899
1900     prop->set(obj, value, errp);
1901     g_free(value);
1902 }
1903
1904 static void property_release_str(Object *obj, const char *name,
1905                                  void *opaque)
1906 {
1907     StringProperty *prop = opaque;
1908     g_free(prop);
1909 }
1910
1911 void object_property_add_str(Object *obj, const char *name,
1912                            char *(*get)(Object *, Error **),
1913                            void (*set)(Object *, const char *, Error **),
1914                            Error **errp)
1915 {
1916     Error *local_err = NULL;
1917     StringProperty *prop = g_malloc0(sizeof(*prop));
1918
1919     prop->get = get;
1920     prop->set = set;
1921
1922     object_property_add(obj, name, "string",
1923                         get ? property_get_str : NULL,
1924                         set ? property_set_str : NULL,
1925                         property_release_str,
1926                         prop, &local_err);
1927     if (local_err) {
1928         error_propagate(errp, local_err);
1929         g_free(prop);
1930     }
1931 }
1932
1933 void object_class_property_add_str(ObjectClass *klass, const char *name,
1934                                    char *(*get)(Object *, Error **),
1935                                    void (*set)(Object *, const char *,
1936                                                Error **),
1937                                    Error **errp)
1938 {
1939     Error *local_err = NULL;
1940     StringProperty *prop = g_malloc0(sizeof(*prop));
1941
1942     prop->get = get;
1943     prop->set = set;
1944
1945     object_class_property_add(klass, name, "string",
1946                               get ? property_get_str : NULL,
1947                               set ? property_set_str : NULL,
1948                               property_release_str,
1949                               prop, &local_err);
1950     if (local_err) {
1951         error_propagate(errp, local_err);
1952         g_free(prop);
1953     }
1954 }
1955
1956 typedef struct BoolProperty
1957 {
1958     bool (*get)(Object *, Error **);
1959     void (*set)(Object *, bool, Error **);
1960 } BoolProperty;
1961
1962 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1963                               void *opaque, Error **errp)
1964 {
1965     BoolProperty *prop = opaque;
1966     bool value;
1967     Error *err = NULL;
1968
1969     value = prop->get(obj, &err);
1970     if (err) {
1971         error_propagate(errp, err);
1972         return;
1973     }
1974
1975     visit_type_bool(v, name, &value, errp);
1976 }
1977
1978 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1979                               void *opaque, Error **errp)
1980 {
1981     BoolProperty *prop = opaque;
1982     bool value;
1983     Error *local_err = NULL;
1984
1985     visit_type_bool(v, name, &value, &local_err);
1986     if (local_err) {
1987         error_propagate(errp, local_err);
1988         return;
1989     }
1990
1991     prop->set(obj, value, errp);
1992 }
1993
1994 static void property_release_bool(Object *obj, const char *name,
1995                                   void *opaque)
1996 {
1997     BoolProperty *prop = opaque;
1998     g_free(prop);
1999 }
2000
2001 void object_property_add_bool(Object *obj, const char *name,
2002                               bool (*get)(Object *, Error **),
2003                               void (*set)(Object *, bool, Error **),
2004                               Error **errp)
2005 {
2006     Error *local_err = NULL;
2007     BoolProperty *prop = g_malloc0(sizeof(*prop));
2008
2009     prop->get = get;
2010     prop->set = set;
2011
2012     object_property_add(obj, name, "bool",
2013                         get ? property_get_bool : NULL,
2014                         set ? property_set_bool : NULL,
2015                         property_release_bool,
2016                         prop, &local_err);
2017     if (local_err) {
2018         error_propagate(errp, local_err);
2019         g_free(prop);
2020     }
2021 }
2022
2023 void object_class_property_add_bool(ObjectClass *klass, const char *name,
2024                                     bool (*get)(Object *, Error **),
2025                                     void (*set)(Object *, bool, Error **),
2026                                     Error **errp)
2027 {
2028     Error *local_err = NULL;
2029     BoolProperty *prop = g_malloc0(sizeof(*prop));
2030
2031     prop->get = get;
2032     prop->set = set;
2033
2034     object_class_property_add(klass, name, "bool",
2035                               get ? property_get_bool : NULL,
2036                               set ? property_set_bool : NULL,
2037                               property_release_bool,
2038                               prop, &local_err);
2039     if (local_err) {
2040         error_propagate(errp, local_err);
2041         g_free(prop);
2042     }
2043 }
2044
2045 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2046                               void *opaque, Error **errp)
2047 {
2048     EnumProperty *prop = opaque;
2049     int value;
2050     Error *err = NULL;
2051
2052     value = prop->get(obj, &err);
2053     if (err) {
2054         error_propagate(errp, err);
2055         return;
2056     }
2057
2058     visit_type_enum(v, name, &value, prop->lookup, errp);
2059 }
2060
2061 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2062                               void *opaque, Error **errp)
2063 {
2064     EnumProperty *prop = opaque;
2065     int value;
2066     Error *err = NULL;
2067
2068     visit_type_enum(v, name, &value, prop->lookup, &err);
2069     if (err) {
2070         error_propagate(errp, err);
2071         return;
2072     }
2073     prop->set(obj, value, errp);
2074 }
2075
2076 static void property_release_enum(Object *obj, const char *name,
2077                                   void *opaque)
2078 {
2079     EnumProperty *prop = opaque;
2080     g_free(prop);
2081 }
2082
2083 void object_property_add_enum(Object *obj, const char *name,
2084                               const char *typename,
2085                               const QEnumLookup *lookup,
2086                               int (*get)(Object *, Error **),
2087                               void (*set)(Object *, int, Error **),
2088                               Error **errp)
2089 {
2090     Error *local_err = NULL;
2091     EnumProperty *prop = g_malloc(sizeof(*prop));
2092
2093     prop->lookup = lookup;
2094     prop->get = get;
2095     prop->set = set;
2096
2097     object_property_add(obj, name, typename,
2098                         get ? property_get_enum : NULL,
2099                         set ? property_set_enum : NULL,
2100                         property_release_enum,
2101                         prop, &local_err);
2102     if (local_err) {
2103         error_propagate(errp, local_err);
2104         g_free(prop);
2105     }
2106 }
2107
2108 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2109                                     const char *typename,
2110                                     const QEnumLookup *lookup,
2111                                     int (*get)(Object *, Error **),
2112                                     void (*set)(Object *, int, Error **),
2113                                     Error **errp)
2114 {
2115     Error *local_err = NULL;
2116     EnumProperty *prop = g_malloc(sizeof(*prop));
2117
2118     prop->lookup = lookup;
2119     prop->get = get;
2120     prop->set = set;
2121
2122     object_class_property_add(klass, name, typename,
2123                               get ? property_get_enum : NULL,
2124                               set ? property_set_enum : NULL,
2125                               property_release_enum,
2126                               prop, &local_err);
2127     if (local_err) {
2128         error_propagate(errp, local_err);
2129         g_free(prop);
2130     }
2131 }
2132
2133 typedef struct TMProperty {
2134     void (*get)(Object *, struct tm *, Error **);
2135 } TMProperty;
2136
2137 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2138                             void *opaque, Error **errp)
2139 {
2140     TMProperty *prop = opaque;
2141     Error *err = NULL;
2142     struct tm value;
2143
2144     prop->get(obj, &value, &err);
2145     if (err) {
2146         goto out;
2147     }
2148
2149     visit_start_struct(v, name, NULL, 0, &err);
2150     if (err) {
2151         goto out;
2152     }
2153     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2154     if (err) {
2155         goto out_end;
2156     }
2157     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2158     if (err) {
2159         goto out_end;
2160     }
2161     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2162     if (err) {
2163         goto out_end;
2164     }
2165     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2166     if (err) {
2167         goto out_end;
2168     }
2169     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2170     if (err) {
2171         goto out_end;
2172     }
2173     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2174     if (err) {
2175         goto out_end;
2176     }
2177     visit_check_struct(v, &err);
2178 out_end:
2179     visit_end_struct(v, NULL);
2180 out:
2181     error_propagate(errp, err);
2182
2183 }
2184
2185 static void property_release_tm(Object *obj, const char *name,
2186                                 void *opaque)
2187 {
2188     TMProperty *prop = opaque;
2189     g_free(prop);
2190 }
2191
2192 void object_property_add_tm(Object *obj, const char *name,
2193                             void (*get)(Object *, struct tm *, Error **),
2194                             Error **errp)
2195 {
2196     Error *local_err = NULL;
2197     TMProperty *prop = g_malloc0(sizeof(*prop));
2198
2199     prop->get = get;
2200
2201     object_property_add(obj, name, "struct tm",
2202                         get ? property_get_tm : NULL, NULL,
2203                         property_release_tm,
2204                         prop, &local_err);
2205     if (local_err) {
2206         error_propagate(errp, local_err);
2207         g_free(prop);
2208     }
2209 }
2210
2211 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2212                                   void (*get)(Object *, struct tm *, Error **),
2213                                   Error **errp)
2214 {
2215     Error *local_err = NULL;
2216     TMProperty *prop = g_malloc0(sizeof(*prop));
2217
2218     prop->get = get;
2219
2220     object_class_property_add(klass, name, "struct tm",
2221                               get ? property_get_tm : NULL, NULL,
2222                               property_release_tm,
2223                               prop, &local_err);
2224     if (local_err) {
2225         error_propagate(errp, local_err);
2226         g_free(prop);
2227     }
2228 }
2229
2230 static char *qdev_get_type(Object *obj, Error **errp)
2231 {
2232     return g_strdup(object_get_typename(obj));
2233 }
2234
2235 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2236                                    void *opaque, Error **errp)
2237 {
2238     uint8_t value = *(uint8_t *)opaque;
2239     visit_type_uint8(v, name, &value, errp);
2240 }
2241
2242 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2243                                     void *opaque, Error **errp)
2244 {
2245     uint16_t value = *(uint16_t *)opaque;
2246     visit_type_uint16(v, name, &value, errp);
2247 }
2248
2249 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2250                                     void *opaque, Error **errp)
2251 {
2252     uint32_t value = *(uint32_t *)opaque;
2253     visit_type_uint32(v, name, &value, errp);
2254 }
2255
2256 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2257                                     void *opaque, Error **errp)
2258 {
2259     uint64_t value = *(uint64_t *)opaque;
2260     visit_type_uint64(v, name, &value, errp);
2261 }
2262
2263 void object_property_add_uint8_ptr(Object *obj, const char *name,
2264                                    const uint8_t *v, Error **errp)
2265 {
2266     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2267                         NULL, NULL, (void *)v, errp);
2268 }
2269
2270 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2271                                          const uint8_t *v, Error **errp)
2272 {
2273     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2274                               NULL, NULL, (void *)v, errp);
2275 }
2276
2277 void object_property_add_uint16_ptr(Object *obj, const char *name,
2278                                     const uint16_t *v, Error **errp)
2279 {
2280     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2281                         NULL, NULL, (void *)v, errp);
2282 }
2283
2284 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2285                                           const uint16_t *v, Error **errp)
2286 {
2287     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2288                               NULL, NULL, (void *)v, errp);
2289 }
2290
2291 void object_property_add_uint32_ptr(Object *obj, const char *name,
2292                                     const uint32_t *v, Error **errp)
2293 {
2294     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2295                         NULL, NULL, (void *)v, errp);
2296 }
2297
2298 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2299                                           const uint32_t *v, Error **errp)
2300 {
2301     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2302                               NULL, NULL, (void *)v, errp);
2303 }
2304
2305 void object_property_add_uint64_ptr(Object *obj, const char *name,
2306                                     const uint64_t *v, Error **errp)
2307 {
2308     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2309                         NULL, NULL, (void *)v, errp);
2310 }
2311
2312 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2313                                           const uint64_t *v, Error **errp)
2314 {
2315     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2316                               NULL, NULL, (void *)v, errp);
2317 }
2318
2319 typedef struct {
2320     Object *target_obj;
2321     char *target_name;
2322 } AliasProperty;
2323
2324 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2325                                void *opaque, Error **errp)
2326 {
2327     AliasProperty *prop = opaque;
2328
2329     object_property_get(prop->target_obj, v, prop->target_name, errp);
2330 }
2331
2332 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2333                                void *opaque, Error **errp)
2334 {
2335     AliasProperty *prop = opaque;
2336
2337     object_property_set(prop->target_obj, v, prop->target_name, errp);
2338 }
2339
2340 static Object *property_resolve_alias(Object *obj, void *opaque,
2341                                       const gchar *part)
2342 {
2343     AliasProperty *prop = opaque;
2344
2345     return object_resolve_path_component(prop->target_obj, prop->target_name);
2346 }
2347
2348 static void property_release_alias(Object *obj, const char *name, void *opaque)
2349 {
2350     AliasProperty *prop = opaque;
2351
2352     g_free(prop->target_name);
2353     g_free(prop);
2354 }
2355
2356 void object_property_add_alias(Object *obj, const char *name,
2357                                Object *target_obj, const char *target_name,
2358                                Error **errp)
2359 {
2360     AliasProperty *prop;
2361     ObjectProperty *op;
2362     ObjectProperty *target_prop;
2363     gchar *prop_type;
2364     Error *local_err = NULL;
2365
2366     target_prop = object_property_find(target_obj, target_name, errp);
2367     if (!target_prop) {
2368         return;
2369     }
2370
2371     if (object_property_is_child(target_prop)) {
2372         prop_type = g_strdup_printf("link%s",
2373                                     target_prop->type + strlen("child"));
2374     } else {
2375         prop_type = g_strdup(target_prop->type);
2376     }
2377
2378     prop = g_malloc(sizeof(*prop));
2379     prop->target_obj = target_obj;
2380     prop->target_name = g_strdup(target_name);
2381
2382     op = object_property_add(obj, name, prop_type,
2383                              property_get_alias,
2384                              property_set_alias,
2385                              property_release_alias,
2386                              prop, &local_err);
2387     if (local_err) {
2388         error_propagate(errp, local_err);
2389         g_free(prop);
2390         goto out;
2391     }
2392     op->resolve = property_resolve_alias;
2393
2394     object_property_set_description(obj, op->name,
2395                                     target_prop->description,
2396                                     &error_abort);
2397
2398 out:
2399     g_free(prop_type);
2400 }
2401
2402 void object_property_set_description(Object *obj, const char *name,
2403                                      const char *description, Error **errp)
2404 {
2405     ObjectProperty *op;
2406
2407     op = object_property_find(obj, name, errp);
2408     if (!op) {
2409         return;
2410     }
2411
2412     g_free(op->description);
2413     op->description = g_strdup(description);
2414 }
2415
2416 void object_class_property_set_description(ObjectClass *klass,
2417                                            const char *name,
2418                                            const char *description,
2419                                            Error **errp)
2420 {
2421     ObjectProperty *op;
2422
2423     op = g_hash_table_lookup(klass->properties, name);
2424     if (!op) {
2425         error_setg(errp, "Property '.%s' not found", name);
2426         return;
2427     }
2428
2429     g_free(op->description);
2430     op->description = g_strdup(description);
2431 }
2432
2433 static void object_class_init(ObjectClass *klass, void *data)
2434 {
2435     object_class_property_add_str(klass, "type", qdev_get_type,
2436                                   NULL, &error_abort);
2437 }
2438
2439 static void register_types(void)
2440 {
2441     static TypeInfo interface_info = {
2442         .name = TYPE_INTERFACE,
2443         .class_size = sizeof(InterfaceClass),
2444         .abstract = true,
2445     };
2446
2447     static TypeInfo object_info = {
2448         .name = TYPE_OBJECT,
2449         .instance_size = sizeof(Object),
2450         .class_init = object_class_init,
2451         .abstract = true,
2452     };
2453
2454     type_interface = type_register_internal(&interface_info);
2455     type_register_internal(&object_info);
2456 }
2457
2458 type_init(register_types)