qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qom/object.h"
  16 #include "qom/object_interfaces.h"
  17 #include "qemu/cutils.h"
  18 #include "qapi/visitor.h"
  19 #include "qapi-visit.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qmp/qerror.h"
  23 #include "trace.h"
  24
  25 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  26  * of the QOM core on QObject?  */
  27 #include "qom/qom-qobject.h"
  28 #include "qapi/qmp/qobject.h"
  29 #include "qapi/qmp/qbool.h"
  30 #include "qapi/qmp/qint.h"
  31 #include "qapi/qmp/qstring.h"
  32
  33 #define MAX_INTERFACES 32
  34
  35 typedef struct InterfaceImpl InterfaceImpl;
  36 typedef struct TypeImpl TypeImpl;
  37
  38 struct InterfaceImpl
  39 {
  40     const char *typename;
  41 };
  42
  43 struct TypeImpl
  44 {
  45     const char *name;
  46
  47     size_t class_size;
  48
  49     size_t instance_size;
  50
  51     void (*class_init)(ObjectClass *klass, void *data);
  52     void (*class_base_init)(ObjectClass *klass, void *data);
  53     void (*class_finalize)(ObjectClass *klass, void *data);
  54
  55     void *class_data;
  56
  57     void (*instance_init)(Object *obj);
  58     void (*instance_post_init)(Object *obj);
  59     void (*instance_finalize)(Object *obj);
  60
  61     bool abstract;
  62
  63     const char *parent;
  64     TypeImpl *parent_type;
  65
  66     ObjectClass *class;
  67
  68     int num_interfaces;
  69     InterfaceImpl interfaces[MAX_INTERFACES];
  70 };
  71
  72 static Type type_interface;
  73
  74 static GHashTable *type_table_get(void)
  75 {
  76     static GHashTable *type_table;
  77
  78     if (type_table == NULL) {
  79         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  80     }
  81
  82     return type_table;
  83 }
  84
  85 static bool enumerating_types;
  86
  87 static void type_table_add(TypeImpl *ti)
  88 {
  89     assert(!enumerating_types);
  90     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  91 }
  92
  93 static TypeImpl *type_table_lookup(const char *name)
  94 {
  95     return g_hash_table_lookup(type_table_get(), name);
  96 }
  97
  98 static TypeImpl *type_new(const TypeInfo *info)
  99 {
 100     TypeImpl *ti = g_malloc0(sizeof(*ti));
 101     int i;
 102
 103     g_assert(info->name != NULL);
 104
 105     if (type_table_lookup(info->name) != NULL) {
 106         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 107         abort();
 108     }
 109
 110     ti->name = g_strdup(info->name);
 111     ti->parent = g_strdup(info->parent);
 112
 113     ti->class_size = info->class_size;
 114     ti->instance_size = info->instance_size;
 115
 116     ti->class_init = info->class_init;
 117     ti->class_base_init = info->class_base_init;
 118     ti->class_finalize = info->class_finalize;
 119     ti->class_data = info->class_data;
 120
 121     ti->instance_init = info->instance_init;
 122     ti->instance_post_init = info->instance_post_init;
 123     ti->instance_finalize = info->instance_finalize;
 124
 125     ti->abstract = info->abstract;
 126
 127     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 128         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 129     }
 130     ti->num_interfaces = i;
 131
 132     return ti;
 133 }
 134
 135 static TypeImpl *type_register_internal(const TypeInfo *info)
 136 {
 137     TypeImpl *ti;
 138     ti = type_new(info);
 139
 140     type_table_add(ti);
 141     return ti;
 142 }
 143
 144 TypeImpl *type_register(const TypeInfo *info)
 145 {
 146     assert(info->parent);
 147     return type_register_internal(info);
 148 }
 149
 150 TypeImpl *type_register_static(const TypeInfo *info)
 151 {
 152     return type_register(info);
 153 }
 154
 155 static TypeImpl *type_get_by_name(const char *name)
 156 {
 157     if (name == NULL) {
 158         return NULL;
 159     }
 160
 161     return type_table_lookup(name);
 162 }
 163
 164 static TypeImpl *type_get_parent(TypeImpl *type)
 165 {
 166     if (!type->parent_type && type->parent) {
 167         type->parent_type = type_get_by_name(type->parent);
 168         g_assert(type->parent_type != NULL);
 169     }
 170
 171     return type->parent_type;
 172 }
 173
 174 static bool type_has_parent(TypeImpl *type)
 175 {
 176     return (type->parent != NULL);
 177 }
 178
 179 static size_t type_class_get_size(TypeImpl *ti)
 180 {
 181     if (ti->class_size) {
 182         return ti->class_size;
 183     }
 184
 185     if (type_has_parent(ti)) {
 186         return type_class_get_size(type_get_parent(ti));
 187     }
 188
 189     return sizeof(ObjectClass);
 190 }
 191
 192 static size_t type_object_get_size(TypeImpl *ti)
 193 {
 194     if (ti->instance_size) {
 195         return ti->instance_size;
 196     }
 197
 198     if (type_has_parent(ti)) {
 199         return type_object_get_size(type_get_parent(ti));
 200     }
 201
 202     return 0;
 203 }
 204
 205 size_t object_type_get_instance_size(const char *typename)
 206 {
 207     TypeImpl *type = type_get_by_name(typename);
 208
 209     g_assert(type != NULL);
 210     return type_object_get_size(type);
 211 }
 212
 213 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 214 {
 215     assert(target_type);
 216
 217     /* Check if target_type is a direct ancestor of type */
 218     while (type) {
 219         if (type == target_type) {
 220             return true;
 221         }
 222
 223         type = type_get_parent(type);
 224     }
 225
 226     return false;
 227 }
 228
 229 static void type_initialize(TypeImpl *ti);
 230
 231 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 232                                       TypeImpl *parent_type)
 233 {
 234     InterfaceClass *new_iface;
 235     TypeInfo info = { };
 236     TypeImpl *iface_impl;
 237
 238     info.parent = parent_type->name;
 239     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 240     info.abstract = true;
 241
 242     iface_impl = type_new(&info);
 243     iface_impl->parent_type = parent_type;
 244     type_initialize(iface_impl);
 245     g_free((char *)info.name);
 246
 247     new_iface = (InterfaceClass *)iface_impl->class;
 248     new_iface->concrete_class = ti->class;
 249     new_iface->interface_type = interface_type;
 250
 251     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 252                                            iface_impl->class);
 253 }
 254
 255 static void object_property_free(gpointer data)
 256 {
 257     ObjectProperty *prop = data;
 258
 259     g_free(prop->name);
 260     g_free(prop->type);
 261     g_free(prop->description);
 262     g_free(prop);
 263 }
 264
 265 static void type_initialize(TypeImpl *ti)
 266 {
 267     TypeImpl *parent;
 268
 269     if (ti->class) {
 270         return;
 271     }
 272
 273     ti->class_size = type_class_get_size(ti);
 274     ti->instance_size = type_object_get_size(ti);
 275
 276     ti->class = g_malloc0(ti->class_size);
 277
 278     parent = type_get_parent(ti);
 279     if (parent) {
 280         type_initialize(parent);
 281         GSList *e;
 282         int i;
 283
 284         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 285         memcpy(ti->class, parent->class, parent->class_size);
 286         ti->class->interfaces = NULL;
 287         ti->class->properties = g_hash_table_new_full(
 288             g_str_hash, g_str_equal, g_free, object_property_free);
 289
 290         for (e = parent->class->interfaces; e; e = e->next) {
 291             InterfaceClass *iface = e->data;
 292             ObjectClass *klass = OBJECT_CLASS(iface);
 293
 294             type_initialize_interface(ti, iface->interface_type, klass->type);
 295         }
 296
 297         for (i = 0; i < ti->num_interfaces; i++) {
 298             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 299             for (e = ti->class->interfaces; e; e = e->next) {
 300                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 301
 302                 if (type_is_ancestor(target_type, t)) {
 303                     break;
 304                 }
 305             }
 306
 307             if (e) {
 308                 continue;
 309             }
 310
 311             type_initialize_interface(ti, t, t);
 312         }
 313     } else {
 314         ti->class->properties = g_hash_table_new_full(
 315             g_str_hash, g_str_equal, g_free, object_property_free);
 316     }
 317
 318     ti->class->type = ti;
 319
 320     while (parent) {
 321         if (parent->class_base_init) {
 322             parent->class_base_init(ti->class, ti->class_data);
 323         }
 324         parent = type_get_parent(parent);
 325     }
 326
 327     if (ti->class_init) {
 328         ti->class_init(ti->class, ti->class_data);
 329     }
 330 }
 331
 332 static void object_init_with_type(Object *obj, TypeImpl *ti)
 333 {
 334     if (type_has_parent(ti)) {
 335         object_init_with_type(obj, type_get_parent(ti));
 336     }
 337
 338     if (ti->instance_init) {
 339         ti->instance_init(obj);
 340     }
 341 }
 342
 343 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 344 {
 345     if (ti->instance_post_init) {
 346         ti->instance_post_init(obj);
 347     }
 348
 349     if (type_has_parent(ti)) {
 350         object_post_init_with_type(obj, type_get_parent(ti));
 351     }
 352 }
 353
 354 void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 355 {
 356     Object *obj = data;
 357
 358     g_assert(type != NULL);
 359     type_initialize(type);
 360
 361     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 362     g_assert(type->abstract == false);
 363     g_assert_cmpint(size, >=, type->instance_size);
 364
 365     memset(obj, 0, type->instance_size);
 366     obj->class = type->class;
 367     object_ref(obj);
 368     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 369                                             NULL, object_property_free);
 370     object_init_with_type(obj, type);
 371     object_post_init_with_type(obj, type);
 372 }
 373
 374 void object_initialize(void *data, size_t size, const char *typename)
 375 {
 376     TypeImpl *type = type_get_by_name(typename);
 377
 378     object_initialize_with_type(data, size, type);
 379 }
 380
 381 static inline bool object_property_is_child(ObjectProperty *prop)
 382 {
 383     return strstart(prop->type, "child<", NULL);
 384 }
 385
 386 static void object_property_del_all(Object *obj)
 387 {
 388     ObjectProperty *prop;
 389     GHashTableIter iter;
 390     gpointer key, value;
 391     bool released;
 392
 393     do {
 394         released = false;
 395         g_hash_table_iter_init(&iter, obj->properties);
 396         while (g_hash_table_iter_next(&iter, &key, &value)) {
 397             prop = value;
 398             if (prop->release) {
 399                 prop->release(obj, prop->name, prop->opaque);
 400                 prop->release = NULL;
 401                 released = true;
 402                 break;
 403             }
 404             g_hash_table_iter_remove(&iter);
 405         }
 406     } while (released);
 407
 408     g_hash_table_unref(obj->properties);
 409 }
 410
 411 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 412 {
 413     ObjectProperty *prop;
 414     GHashTableIter iter;
 415     gpointer key, value;
 416
 417     g_hash_table_iter_init(&iter, obj->properties);
 418     while (g_hash_table_iter_next(&iter, &key, &value)) {
 419         prop = value;
 420         if (object_property_is_child(prop) && prop->opaque == child) {
 421             if (prop->release) {
 422                 prop->release(obj, prop->name, prop->opaque);
 423                 prop->release = NULL;
 424             }
 425             break;
 426         }
 427     }
 428     g_hash_table_iter_init(&iter, obj->properties);
 429     while (g_hash_table_iter_next(&iter, &key, &value)) {
 430         prop = value;
 431         if (object_property_is_child(prop) && prop->opaque == child) {
 432             g_hash_table_iter_remove(&iter);
 433             break;
 434         }
 435     }
 436 }
 437
 438 void object_unparent(Object *obj)
 439 {
 440     if (obj->parent) {
 441         object_property_del_child(obj->parent, obj, NULL);
 442     }
 443 }
 444
 445 static void object_deinit(Object *obj, TypeImpl *type)
 446 {
 447     if (type->instance_finalize) {
 448         type->instance_finalize(obj);
 449     }
 450
 451     if (type_has_parent(type)) {
 452         object_deinit(obj, type_get_parent(type));
 453     }
 454 }
 455
 456 static void object_finalize(void *data)
 457 {
 458     Object *obj = data;
 459     TypeImpl *ti = obj->class->type;
 460
 461     object_property_del_all(obj);
 462     object_deinit(obj, ti);
 463
 464     g_assert_cmpint(obj->ref, ==, 0);
 465     if (obj->free) {
 466         obj->free(obj);
 467     }
 468 }
 469
 470 Object *object_new_with_type(Type type)
 471 {
 472     Object *obj;
 473
 474     g_assert(type != NULL);
 475     type_initialize(type);
 476
 477     obj = g_malloc(type->instance_size);
 478     object_initialize_with_type(obj, type->instance_size, type);
 479     obj->free = g_free;
 480
 481     return obj;
 482 }
 483
 484 Object *object_new(const char *typename)
 485 {
 486     TypeImpl *ti = type_get_by_name(typename);
 487
 488     return object_new_with_type(ti);
 489 }
 490
 491
 492 Object *object_new_with_props(const char *typename,
 493                               Object *parent,
 494                               const char *id,
 495                               Error **errp,
 496                               ...)
 497 {
 498     va_list vargs;
 499     Object *obj;
 500
 501     va_start(vargs, errp);
 502     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 503     va_end(vargs);
 504
 505     return obj;
 506 }
 507
 508
 509 Object *object_new_with_propv(const char *typename,
 510                               Object *parent,
 511                               const char *id,
 512                               Error **errp,
 513                               va_list vargs)
 514 {
 515     Object *obj;
 516     ObjectClass *klass;
 517     Error *local_err = NULL;
 518
 519     klass = object_class_by_name(typename);
 520     if (!klass) {
 521         error_setg(errp, "invalid object type: %s", typename);
 522         return NULL;
 523     }
 524
 525     if (object_class_is_abstract(klass)) {
 526         error_setg(errp, "object type '%s' is abstract", typename);
 527         return NULL;
 528     }
 529     obj = object_new(typename);
 530
 531     if (object_set_propv(obj, &local_err, vargs) < 0) {
 532         goto error;
 533     }
 534
 535     object_property_add_child(parent, id, obj, &local_err);
 536     if (local_err) {
 537         goto error;
 538     }
 539
 540     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 541         user_creatable_complete(obj, &local_err);
 542         if (local_err) {
 543             object_unparent(obj);
 544             goto error;
 545         }
 546     }
 547
 548     object_unref(OBJECT(obj));
 549     return obj;
 550
 551  error:
 552     if (local_err) {
 553         error_propagate(errp, local_err);
 554     }
 555     object_unref(obj);
 556     return NULL;
 557 }
 558
 559
 560 int object_set_props(Object *obj,
 561                      Error **errp,
 562                      ...)
 563 {
 564     va_list vargs;
 565     int ret;
 566
 567     va_start(vargs, errp);
 568     ret = object_set_propv(obj, errp, vargs);
 569     va_end(vargs);
 570
 571     return ret;
 572 }
 573
 574
 575 int object_set_propv(Object *obj,
 576                      Error **errp,
 577                      va_list vargs)
 578 {
 579     const char *propname;
 580     Error *local_err = NULL;
 581
 582     propname = va_arg(vargs, char *);
 583     while (propname != NULL) {
 584         const char *value = va_arg(vargs, char *);
 585
 586         g_assert(value != NULL);
 587         object_property_parse(obj, value, propname, &local_err);
 588         if (local_err) {
 589             error_propagate(errp, local_err);
 590             return -1;
 591         }
 592         propname = va_arg(vargs, char *);
 593     }
 594
 595     return 0;
 596 }
 597
 598
 599 Object *object_dynamic_cast(Object *obj, const char *typename)
 600 {
 601     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 602         return obj;
 603     }
 604
 605     return NULL;
 606 }
 607
 608 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 609                                    const char *file, int line, const char *func)
 610 {
 611     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 612                                      typename, file, line, func);
 613
 614 #ifdef CONFIG_QOM_CAST_DEBUG
 615     int i;
 616     Object *inst;
 617
 618     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 619         if (obj->class->object_cast_cache[i] == typename) {
 620             goto out;
 621         }
 622     }
 623
 624     inst = object_dynamic_cast(obj, typename);
 625
 626     if (!inst && obj) {
 627         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 628                 file, line, func, obj, typename);
 629         abort();
 630     }
 631
 632     assert(obj == inst);
 633
 634     if (obj && obj == inst) {
 635         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 636             obj->class->object_cast_cache[i - 1] =
 637                     obj->class->object_cast_cache[i];
 638         }
 639         obj->class->object_cast_cache[i - 1] = typename;
 640     }
 641
 642 out:
 643 #endif
 644     return obj;
 645 }
 646
 647 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 648                                        const char *typename)
 649 {
 650     ObjectClass *ret = NULL;
 651     TypeImpl *target_type;
 652     TypeImpl *type;
 653
 654     if (!class) {
 655         return NULL;
 656     }
 657
 658     /* A simple fast path that can trigger a lot for leaf classes.  */
 659     type = class->type;
 660     if (type->name == typename) {
 661         return class;
 662     }
 663
 664     target_type = type_get_by_name(typename);
 665     if (!target_type) {
 666         /* target class type unknown, so fail the cast */
 667         return NULL;
 668     }
 669
 670     if (type->class->interfaces &&
 671             type_is_ancestor(target_type, type_interface)) {
 672         int found = 0;
 673         GSList *i;
 674
 675         for (i = class->interfaces; i; i = i->next) {
 676             ObjectClass *target_class = i->data;
 677
 678             if (type_is_ancestor(target_class->type, target_type)) {
 679                 ret = target_class;
 680                 found++;
 681             }
 682          }
 683
 684         /* The match was ambiguous, don't allow a cast */
 685         if (found > 1) {
 686             ret = NULL;
 687         }
 688     } else if (type_is_ancestor(type, target_type)) {
 689         ret = class;
 690     }
 691
 692     return ret;
 693 }
 694
 695 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 696                                               const char *typename,
 697                                               const char *file, int line,
 698                                               const char *func)
 699 {
 700     ObjectClass *ret;
 701
 702     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 703                                            typename, file, line, func);
 704
 705 #ifdef CONFIG_QOM_CAST_DEBUG
 706     int i;
 707
 708     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 709         if (class->class_cast_cache[i] == typename) {
 710             ret = class;
 711             goto out;
 712         }
 713     }
 714 #else
 715     if (!class || !class->interfaces) {
 716         return class;
 717     }
 718 #endif
 719
 720     ret = object_class_dynamic_cast(class, typename);
 721     if (!ret && class) {
 722         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 723                 file, line, func, class, typename);
 724         abort();
 725     }
 726
 727 #ifdef CONFIG_QOM_CAST_DEBUG
 728     if (class && ret == class) {
 729         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 730             class->class_cast_cache[i - 1] = class->class_cast_cache[i];
 731         }
 732         class->class_cast_cache[i - 1] = typename;
 733     }
 734 out:
 735 #endif
 736     return ret;
 737 }
 738
 739 const char *object_get_typename(Object *obj)
 740 {
 741     return obj->class->type->name;
 742 }
 743
 744 ObjectClass *object_get_class(Object *obj)
 745 {
 746     return obj->class;
 747 }
 748
 749 bool object_class_is_abstract(ObjectClass *klass)
 750 {
 751     return klass->type->abstract;
 752 }
 753
 754 const char *object_class_get_name(ObjectClass *klass)
 755 {
 756     return klass->type->name;
 757 }
 758
 759 ObjectClass *object_class_by_name(const char *typename)
 760 {
 761     TypeImpl *type = type_get_by_name(typename);
 762
 763     if (!type) {
 764         return NULL;
 765     }
 766
 767     type_initialize(type);
 768
 769     return type->class;
 770 }
 771
 772 ObjectClass *object_class_get_parent(ObjectClass *class)
 773 {
 774     TypeImpl *type = type_get_parent(class->type);
 775
 776     if (!type) {
 777         return NULL;
 778     }
 779
 780     type_initialize(type);
 781
 782     return type->class;
 783 }
 784
 785 typedef struct OCFData
 786 {
 787     void (*fn)(ObjectClass *klass, void *opaque);
 788     const char *implements_type;
 789     bool include_abstract;
 790     void *opaque;
 791 } OCFData;
 792
 793 static void object_class_foreach_tramp(gpointer key, gpointer value,
 794                                        gpointer opaque)
 795 {
 796     OCFData *data = opaque;
 797     TypeImpl *type = value;
 798     ObjectClass *k;
 799
 800     type_initialize(type);
 801     k = type->class;
 802
 803     if (!data->include_abstract && type->abstract) {
 804         return;
 805     }
 806
 807     if (data->implements_type &&
 808         !object_class_dynamic_cast(k, data->implements_type)) {
 809         return;
 810     }
 811
 812     data->fn(k, data->opaque);
 813 }
 814
 815 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 816                           const char *implements_type, bool include_abstract,
 817                           void *opaque)
 818 {
 819     OCFData data = { fn, implements_type, include_abstract, opaque };
 820
 821     enumerating_types = true;
 822     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 823     enumerating_types = false;
 824 }
 825
 826 static int do_object_child_foreach(Object *obj,
 827                                    int (*fn)(Object *child, void *opaque),
 828                                    void *opaque, bool recurse)
 829 {
 830     GHashTableIter iter;
 831     ObjectProperty *prop;
 832     int ret = 0;
 833
 834     g_hash_table_iter_init(&iter, obj->properties);
 835     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 836         if (object_property_is_child(prop)) {
 837             Object *child = prop->opaque;
 838
 839             ret = fn(child, opaque);
 840             if (ret != 0) {
 841                 break;
 842             }
 843             if (recurse) {
 844                 do_object_child_foreach(child, fn, opaque, true);
 845             }
 846         }
 847     }
 848     return ret;
 849 }
 850
 851 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 852                          void *opaque)
 853 {
 854     return do_object_child_foreach(obj, fn, opaque, false);
 855 }
 856
 857 int object_child_foreach_recursive(Object *obj,
 858                                    int (*fn)(Object *child, void *opaque),
 859                                    void *opaque)
 860 {
 861     return do_object_child_foreach(obj, fn, opaque, true);
 862 }
 863
 864 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 865 {
 866     GSList **list = opaque;
 867
 868     *list = g_slist_prepend(*list, klass);
 869 }
 870
 871 GSList *object_class_get_list(const char *implements_type,
 872                               bool include_abstract)
 873 {
 874     GSList *list = NULL;
 875
 876     object_class_foreach(object_class_get_list_tramp,
 877                          implements_type, include_abstract, &list);
 878     return list;
 879 }
 880
 881 void object_ref(Object *obj)
 882 {
 883     if (!obj) {
 884         return;
 885     }
 886     atomic_inc(&obj->ref);
 887 }
 888
 889 void object_unref(Object *obj)
 890 {
 891     if (!obj) {
 892         return;
 893     }
 894     g_assert_cmpint(obj->ref, >, 0);
 895
 896     /* parent always holds a reference to its children */
 897     if (atomic_fetch_dec(&obj->ref) == 1) {
 898         object_finalize(obj);
 899     }
 900 }
 901
 902 ObjectProperty *
 903 object_property_add(Object *obj, const char *name, const char *type,
 904                     ObjectPropertyAccessor *get,
 905                     ObjectPropertyAccessor *set,
 906                     ObjectPropertyRelease *release,
 907                     void *opaque, Error **errp)
 908 {
 909     ObjectProperty *prop;
 910     size_t name_len = strlen(name);
 911
 912     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 913         int i;
 914         ObjectProperty *ret;
 915         char *name_no_array = g_strdup(name);
 916
 917         name_no_array[name_len - 3] = '\0';
 918         for (i = 0; ; ++i) {
 919             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 920
 921             ret = object_property_add(obj, full_name, type, get, set,
 922                                       release, opaque, NULL);
 923             g_free(full_name);
 924             if (ret) {
 925                 break;
 926             }
 927         }
 928         g_free(name_no_array);
 929         return ret;
 930     }
 931
 932     if (object_property_find(obj, name, NULL) != NULL) {
 933         error_setg(errp, "attempt to add duplicate property '%s'"
 934                    " to object (type '%s')", name,
 935                    object_get_typename(obj));
 936         return NULL;
 937     }
 938
 939     prop = g_malloc0(sizeof(*prop));
 940
 941     prop->name = g_strdup(name);
 942     prop->type = g_strdup(type);
 943
 944     prop->get = get;
 945     prop->set = set;
 946     prop->release = release;
 947     prop->opaque = opaque;
 948
 949     g_hash_table_insert(obj->properties, prop->name, prop);
 950     return prop;
 951 }
 952
 953 ObjectProperty *
 954 object_class_property_add(ObjectClass *klass,
 955                           const char *name,
 956                           const char *type,
 957                           ObjectPropertyAccessor *get,
 958                           ObjectPropertyAccessor *set,
 959                           ObjectPropertyRelease *release,
 960                           void *opaque,
 961                           Error **errp)
 962 {
 963     ObjectProperty *prop;
 964
 965     if (object_class_property_find(klass, name, NULL) != NULL) {
 966         error_setg(errp, "attempt to add duplicate property '%s'"
 967                    " to object (type '%s')", name,
 968                    object_class_get_name(klass));
 969         return NULL;
 970     }
 971
 972     prop = g_malloc0(sizeof(*prop));
 973
 974     prop->name = g_strdup(name);
 975     prop->type = g_strdup(type);
 976
 977     prop->get = get;
 978     prop->set = set;
 979     prop->release = release;
 980     prop->opaque = opaque;
 981
 982     g_hash_table_insert(klass->properties, g_strdup(name), prop);
 983
 984     return prop;
 985 }
 986
 987 ObjectProperty *object_property_find(Object *obj, const char *name,
 988                                      Error **errp)
 989 {
 990     ObjectProperty *prop;
 991     ObjectClass *klass = object_get_class(obj);
 992
 993     prop = object_class_property_find(klass, name, NULL);
 994     if (prop) {
 995         return prop;
 996     }
 997
 998     prop = g_hash_table_lookup(obj->properties, name);
 999     if (prop) {
1000         return prop;
1001     }
1002
1003     error_setg(errp, "Property '.%s' not found", name);
1004     return NULL;
1005 }
1006
1007 void object_property_iter_init(ObjectPropertyIterator *iter,
1008                                Object *obj)
1009 {
1010     g_hash_table_iter_init(&iter->iter, obj->properties);
1011     iter->nextclass = object_get_class(obj);
1012 }
1013
1014 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1015 {
1016     gpointer key, val;
1017     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1018         if (!iter->nextclass) {
1019             return NULL;
1020         }
1021         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1022         iter->nextclass = object_class_get_parent(iter->nextclass);
1023     }
1024     return val;
1025 }
1026
1027 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1028                                            Error **errp)
1029 {
1030     ObjectProperty *prop;
1031     ObjectClass *parent_klass;
1032
1033     parent_klass = object_class_get_parent(klass);
1034     if (parent_klass) {
1035         prop = object_class_property_find(parent_klass, name, NULL);
1036         if (prop) {
1037             return prop;
1038         }
1039     }
1040
1041     prop = g_hash_table_lookup(klass->properties, name);
1042     if (!prop) {
1043         error_setg(errp, "Property '.%s' not found", name);
1044     }
1045     return prop;
1046 }
1047
1048 void object_property_del(Object *obj, const char *name, Error **errp)
1049 {
1050     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1051
1052     if (!prop) {
1053         error_setg(errp, "Property '.%s' not found", name);
1054         return;
1055     }
1056
1057     if (prop->release) {
1058         prop->release(obj, name, prop->opaque);
1059     }
1060     g_hash_table_remove(obj->properties, name);
1061 }
1062
1063 void object_property_get(Object *obj, Visitor *v, const char *name,
1064                          Error **errp)
1065 {
1066     ObjectProperty *prop = object_property_find(obj, name, errp);
1067     if (prop == NULL) {
1068         return;
1069     }
1070
1071     if (!prop->get) {
1072         error_setg(errp, QERR_PERMISSION_DENIED);
1073     } else {
1074         prop->get(obj, v, name, prop->opaque, errp);
1075     }
1076 }
1077
1078 void object_property_set(Object *obj, Visitor *v, const char *name,
1079                          Error **errp)
1080 {
1081     ObjectProperty *prop = object_property_find(obj, name, errp);
1082     if (prop == NULL) {
1083         return;
1084     }
1085
1086     if (!prop->set) {
1087         error_setg(errp, QERR_PERMISSION_DENIED);
1088     } else {
1089         prop->set(obj, v, name, prop->opaque, errp);
1090     }
1091 }
1092
1093 void object_property_set_str(Object *obj, const char *value,
1094                              const char *name, Error **errp)
1095 {
1096     QString *qstr = qstring_from_str(value);
1097     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1098
1099     QDECREF(qstr);
1100 }
1101
1102 char *object_property_get_str(Object *obj, const char *name,
1103                               Error **errp)
1104 {
1105     QObject *ret = object_property_get_qobject(obj, name, errp);
1106     QString *qstring;
1107     char *retval;
1108
1109     if (!ret) {
1110         return NULL;
1111     }
1112     qstring = qobject_to_qstring(ret);
1113     if (!qstring) {
1114         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1115         retval = NULL;
1116     } else {
1117         retval = g_strdup(qstring_get_str(qstring));
1118     }
1119
1120     QDECREF(qstring);
1121     return retval;
1122 }
1123
1124 void object_property_set_link(Object *obj, Object *value,
1125                               const char *name, Error **errp)
1126 {
1127     if (value) {
1128         gchar *path = object_get_canonical_path(value);
1129         object_property_set_str(obj, path, name, errp);
1130         g_free(path);
1131     } else {
1132         object_property_set_str(obj, "", name, errp);
1133     }
1134 }
1135
1136 Object *object_property_get_link(Object *obj, const char *name,
1137                                  Error **errp)
1138 {
1139     char *str = object_property_get_str(obj, name, errp);
1140     Object *target = NULL;
1141
1142     if (str && *str) {
1143         target = object_resolve_path(str, NULL);
1144         if (!target) {
1145             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1146                       "Device '%s' not found", str);
1147         }
1148     }
1149
1150     g_free(str);
1151     return target;
1152 }
1153
1154 void object_property_set_bool(Object *obj, bool value,
1155                               const char *name, Error **errp)
1156 {
1157     QBool *qbool = qbool_from_bool(value);
1158     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1159
1160     QDECREF(qbool);
1161 }
1162
1163 bool object_property_get_bool(Object *obj, const char *name,
1164                               Error **errp)
1165 {
1166     QObject *ret = object_property_get_qobject(obj, name, errp);
1167     QBool *qbool;
1168     bool retval;
1169
1170     if (!ret) {
1171         return false;
1172     }
1173     qbool = qobject_to_qbool(ret);
1174     if (!qbool) {
1175         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1176         retval = false;
1177     } else {
1178         retval = qbool_get_bool(qbool);
1179     }
1180
1181     QDECREF(qbool);
1182     return retval;
1183 }
1184
1185 void object_property_set_int(Object *obj, int64_t value,
1186                              const char *name, Error **errp)
1187 {
1188     QInt *qint = qint_from_int(value);
1189     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1190
1191     QDECREF(qint);
1192 }
1193
1194 int64_t object_property_get_int(Object *obj, const char *name,
1195                                 Error **errp)
1196 {
1197     QObject *ret = object_property_get_qobject(obj, name, errp);
1198     QInt *qint;
1199     int64_t retval;
1200
1201     if (!ret) {
1202         return -1;
1203     }
1204     qint = qobject_to_qint(ret);
1205     if (!qint) {
1206         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1207         retval = -1;
1208     } else {
1209         retval = qint_get_int(qint);
1210     }
1211
1212     QDECREF(qint);
1213     return retval;
1214 }
1215
1216 typedef struct EnumProperty {
1217     const char * const *strings;
1218     int (*get)(Object *, Error **);
1219     void (*set)(Object *, int, Error **);
1220 } EnumProperty;
1221
1222 int object_property_get_enum(Object *obj, const char *name,
1223                              const char *typename, Error **errp)
1224 {
1225     Error *err = NULL;
1226     StringOutputVisitor *sov;
1227     StringInputVisitor *siv;
1228     char *str;
1229     int ret;
1230     ObjectProperty *prop = object_property_find(obj, name, errp);
1231     EnumProperty *enumprop;
1232
1233     if (prop == NULL) {
1234         return 0;
1235     }
1236
1237     if (!g_str_equal(prop->type, typename)) {
1238         error_setg(errp, "Property %s on %s is not '%s' enum type",
1239                    name, object_class_get_name(
1240                        object_get_class(obj)), typename);
1241         return 0;
1242     }
1243
1244     enumprop = prop->opaque;
1245
1246     sov = string_output_visitor_new(false);
1247     object_property_get(obj, string_output_get_visitor(sov), name, &err);
1248     if (err) {
1249         error_propagate(errp, err);
1250         string_output_visitor_cleanup(sov);
1251         return 0;
1252     }
1253     str = string_output_get_string(sov);
1254     siv = string_input_visitor_new(str);
1255     string_output_visitor_cleanup(sov);
1256     visit_type_enum(string_input_get_visitor(siv), name, &ret,
1257                     enumprop->strings, errp);
1258
1259     g_free(str);
1260     string_input_visitor_cleanup(siv);
1261
1262     return ret;
1263 }
1264
1265 void object_property_get_uint16List(Object *obj, const char *name,
1266                                     uint16List **list, Error **errp)
1267 {
1268     Error *err = NULL;
1269     StringOutputVisitor *ov;
1270     StringInputVisitor *iv;
1271     char *str;
1272
1273     ov = string_output_visitor_new(false);
1274     object_property_get(obj, string_output_get_visitor(ov),
1275                         name, &err);
1276     if (err) {
1277         error_propagate(errp, err);
1278         goto out;
1279     }
1280     str = string_output_get_string(ov);
1281     iv = string_input_visitor_new(str);
1282     visit_type_uint16List(string_input_get_visitor(iv), NULL, list, errp);
1283
1284     g_free(str);
1285     string_input_visitor_cleanup(iv);
1286 out:
1287     string_output_visitor_cleanup(ov);
1288 }
1289
1290 void object_property_parse(Object *obj, const char *string,
1291                            const char *name, Error **errp)
1292 {
1293     StringInputVisitor *siv;
1294     siv = string_input_visitor_new(string);
1295     object_property_set(obj, string_input_get_visitor(siv), name, errp);
1296
1297     string_input_visitor_cleanup(siv);
1298 }
1299
1300 char *object_property_print(Object *obj, const char *name, bool human,
1301                             Error **errp)
1302 {
1303     StringOutputVisitor *sov;
1304     char *string = NULL;
1305     Error *local_err = NULL;
1306
1307     sov = string_output_visitor_new(human);
1308     object_property_get(obj, string_output_get_visitor(sov), name, &local_err);
1309     if (local_err) {
1310         error_propagate(errp, local_err);
1311         goto out;
1312     }
1313
1314     string = string_output_get_string(sov);
1315
1316 out:
1317     string_output_visitor_cleanup(sov);
1318     return string;
1319 }
1320
1321 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1322 {
1323     ObjectProperty *prop = object_property_find(obj, name, errp);
1324     if (prop == NULL) {
1325         return NULL;
1326     }
1327
1328     return prop->type;
1329 }
1330
1331 Object *object_get_root(void)
1332 {
1333     static Object *root;
1334
1335     if (!root) {
1336         root = object_new("container");
1337     }
1338
1339     return root;
1340 }
1341
1342 Object *object_get_objects_root(void)
1343 {
1344     return container_get(object_get_root(), "/objects");
1345 }
1346
1347 static void object_get_child_property(Object *obj, Visitor *v,
1348                                       const char *name, void *opaque,
1349                                       Error **errp)
1350 {
1351     Object *child = opaque;
1352     gchar *path;
1353
1354     path = object_get_canonical_path(child);
1355     visit_type_str(v, name, &path, errp);
1356     g_free(path);
1357 }
1358
1359 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1360 {
1361     return opaque;
1362 }
1363
1364 static void object_finalize_child_property(Object *obj, const char *name,
1365                                            void *opaque)
1366 {
1367     Object *child = opaque;
1368
1369     if (child->class->unparent) {
1370         (child->class->unparent)(child);
1371     }
1372     child->parent = NULL;
1373     object_unref(child);
1374 }
1375
1376 void object_property_add_child(Object *obj, const char *name,
1377                                Object *child, Error **errp)
1378 {
1379     Error *local_err = NULL;
1380     gchar *type;
1381     ObjectProperty *op;
1382
1383     if (child->parent != NULL) {
1384         error_setg(errp, "child object is already parented");
1385         return;
1386     }
1387
1388     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1389
1390     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1391                              object_finalize_child_property, child, &local_err);
1392     if (local_err) {
1393         error_propagate(errp, local_err);
1394         goto out;
1395     }
1396
1397     op->resolve = object_resolve_child_property;
1398     object_ref(child);
1399     child->parent = obj;
1400
1401 out:
1402     g_free(type);
1403 }
1404
1405 void object_property_allow_set_link(Object *obj, const char *name,
1406                                     Object *val, Error **errp)
1407 {
1408     /* Allow the link to be set, always */
1409 }
1410
1411 typedef struct {
1412     Object **child;
1413     void (*check)(Object *, const char *, Object *, Error **);
1414     ObjectPropertyLinkFlags flags;
1415 } LinkProperty;
1416
1417 static void object_get_link_property(Object *obj, Visitor *v,
1418                                      const char *name, void *opaque,
1419                                      Error **errp)
1420 {
1421     LinkProperty *lprop = opaque;
1422     Object **child = lprop->child;
1423     gchar *path;
1424
1425     if (*child) {
1426         path = object_get_canonical_path(*child);
1427         visit_type_str(v, name, &path, errp);
1428         g_free(path);
1429     } else {
1430         path = (gchar *)"";
1431         visit_type_str(v, name, &path, errp);
1432     }
1433 }
1434
1435 /*
1436  * object_resolve_link:
1437  *
1438  * Lookup an object and ensure its type matches the link property type.  This
1439  * is similar to object_resolve_path() except type verification against the
1440  * link property is performed.
1441  *
1442  * Returns: The matched object or NULL on path lookup failures.
1443  */
1444 static Object *object_resolve_link(Object *obj, const char *name,
1445                                    const char *path, Error **errp)
1446 {
1447     const char *type;
1448     gchar *target_type;
1449     bool ambiguous = false;
1450     Object *target;
1451
1452     /* Go from link<FOO> to FOO.  */
1453     type = object_property_get_type(obj, name, NULL);
1454     target_type = g_strndup(&type[5], strlen(type) - 6);
1455     target = object_resolve_path_type(path, target_type, &ambiguous);
1456
1457     if (ambiguous) {
1458         error_setg(errp, "Path '%s' does not uniquely identify an object",
1459                    path);
1460     } else if (!target) {
1461         target = object_resolve_path(path, &ambiguous);
1462         if (target || ambiguous) {
1463             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1464         } else {
1465             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1466                       "Device '%s' not found", path);
1467         }
1468         target = NULL;
1469     }
1470     g_free(target_type);
1471
1472     return target;
1473 }
1474
1475 static void object_set_link_property(Object *obj, Visitor *v,
1476                                      const char *name, void *opaque,
1477                                      Error **errp)
1478 {
1479     Error *local_err = NULL;
1480     LinkProperty *prop = opaque;
1481     Object **child = prop->child;
1482     Object *old_target = *child;
1483     Object *new_target = NULL;
1484     char *path = NULL;
1485
1486     visit_type_str(v, name, &path, &local_err);
1487
1488     if (!local_err && strcmp(path, "") != 0) {
1489         new_target = object_resolve_link(obj, name, path, &local_err);
1490     }
1491
1492     g_free(path);
1493     if (local_err) {
1494         error_propagate(errp, local_err);
1495         return;
1496     }
1497
1498     prop->check(obj, name, new_target, &local_err);
1499     if (local_err) {
1500         error_propagate(errp, local_err);
1501         return;
1502     }
1503
1504     object_ref(new_target);
1505     *child = new_target;
1506     object_unref(old_target);
1507 }
1508
1509 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1510 {
1511     LinkProperty *lprop = opaque;
1512
1513     return *lprop->child;
1514 }
1515
1516 static void object_release_link_property(Object *obj, const char *name,
1517                                          void *opaque)
1518 {
1519     LinkProperty *prop = opaque;
1520
1521     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1522         object_unref(*prop->child);
1523     }
1524     g_free(prop);
1525 }
1526
1527 void object_property_add_link(Object *obj, const char *name,
1528                               const char *type, Object **child,
1529                               void (*check)(Object *, const char *,
1530                                             Object *, Error **),
1531                               ObjectPropertyLinkFlags flags,
1532                               Error **errp)
1533 {
1534     Error *local_err = NULL;
1535     LinkProperty *prop = g_malloc(sizeof(*prop));
1536     gchar *full_type;
1537     ObjectProperty *op;
1538
1539     prop->child = child;
1540     prop->check = check;
1541     prop->flags = flags;
1542
1543     full_type = g_strdup_printf("link<%s>", type);
1544
1545     op = object_property_add(obj, name, full_type,
1546                              object_get_link_property,
1547                              check ? object_set_link_property : NULL,
1548                              object_release_link_property,
1549                              prop,
1550                              &local_err);
1551     if (local_err) {
1552         error_propagate(errp, local_err);
1553         g_free(prop);
1554         goto out;
1555     }
1556
1557     op->resolve = object_resolve_link_property;
1558
1559 out:
1560     g_free(full_type);
1561 }
1562
1563 void object_property_add_const_link(Object *obj, const char *name,
1564                                     Object *target, Error **errp)
1565 {
1566     char *link_type;
1567     ObjectProperty *op;
1568
1569     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1570     op = object_property_add(obj, name, link_type,
1571                              object_get_child_property, NULL,
1572                              NULL, target, errp);
1573     if (op != NULL) {
1574         op->resolve = object_resolve_child_property;
1575     }
1576     g_free(link_type);
1577 }
1578
1579 gchar *object_get_canonical_path_component(Object *obj)
1580 {
1581     ObjectProperty *prop = NULL;
1582     GHashTableIter iter;
1583
1584     g_assert(obj);
1585     g_assert(obj->parent != NULL);
1586
1587     g_hash_table_iter_init(&iter, obj->parent->properties);
1588     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1589         if (!object_property_is_child(prop)) {
1590             continue;
1591         }
1592
1593         if (prop->opaque == obj) {
1594             return g_strdup(prop->name);
1595         }
1596     }
1597
1598     /* obj had a parent but was not a child, should never happen */
1599     g_assert_not_reached();
1600     return NULL;
1601 }
1602
1603 gchar *object_get_canonical_path(Object *obj)
1604 {
1605     Object *root = object_get_root();
1606     char *newpath, *path = NULL;
1607
1608     while (obj != root) {
1609         char *component = object_get_canonical_path_component(obj);
1610
1611         if (path) {
1612             newpath = g_strdup_printf("%s/%s", component, path);
1613             g_free(component);
1614             g_free(path);
1615             path = newpath;
1616         } else {
1617             path = component;
1618         }
1619
1620         obj = obj->parent;
1621     }
1622
1623     newpath = g_strdup_printf("/%s", path ? path : "");
1624     g_free(path);
1625
1626     return newpath;
1627 }
1628
1629 Object *object_resolve_path_component(Object *parent, const gchar *part)
1630 {
1631     ObjectProperty *prop = object_property_find(parent, part, NULL);
1632     if (prop == NULL) {
1633         return NULL;
1634     }
1635
1636     if (prop->resolve) {
1637         return prop->resolve(parent, prop->opaque, part);
1638     } else {
1639         return NULL;
1640     }
1641 }
1642
1643 static Object *object_resolve_abs_path(Object *parent,
1644                                           gchar **parts,
1645                                           const char *typename,
1646                                           int index)
1647 {
1648     Object *child;
1649
1650     if (parts[index] == NULL) {
1651         return object_dynamic_cast(parent, typename);
1652     }
1653
1654     if (strcmp(parts[index], "") == 0) {
1655         return object_resolve_abs_path(parent, parts, typename, index + 1);
1656     }
1657
1658     child = object_resolve_path_component(parent, parts[index]);
1659     if (!child) {
1660         return NULL;
1661     }
1662
1663     return object_resolve_abs_path(child, parts, typename, index + 1);
1664 }
1665
1666 static Object *object_resolve_partial_path(Object *parent,
1667                                               gchar **parts,
1668                                               const char *typename,
1669                                               bool *ambiguous)
1670 {
1671     Object *obj;
1672     GHashTableIter iter;
1673     ObjectProperty *prop;
1674
1675     obj = object_resolve_abs_path(parent, parts, typename, 0);
1676
1677     g_hash_table_iter_init(&iter, parent->properties);
1678     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1679         Object *found;
1680
1681         if (!object_property_is_child(prop)) {
1682             continue;
1683         }
1684
1685         found = object_resolve_partial_path(prop->opaque, parts,
1686                                             typename, ambiguous);
1687         if (found) {
1688             if (obj) {
1689                 if (ambiguous) {
1690                     *ambiguous = true;
1691                 }
1692                 return NULL;
1693             }
1694             obj = found;
1695         }
1696
1697         if (ambiguous && *ambiguous) {
1698             return NULL;
1699         }
1700     }
1701
1702     return obj;
1703 }
1704
1705 Object *object_resolve_path_type(const char *path, const char *typename,
1706                                  bool *ambiguous)
1707 {
1708     Object *obj;
1709     gchar **parts;
1710
1711     parts = g_strsplit(path, "/", 0);
1712     assert(parts);
1713
1714     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1715         if (ambiguous) {
1716             *ambiguous = false;
1717         }
1718         obj = object_resolve_partial_path(object_get_root(), parts,
1719                                           typename, ambiguous);
1720     } else {
1721         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1722     }
1723
1724     g_strfreev(parts);
1725
1726     return obj;
1727 }
1728
1729 Object *object_resolve_path(const char *path, bool *ambiguous)
1730 {
1731     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1732 }
1733
1734 typedef struct StringProperty
1735 {
1736     char *(*get)(Object *, Error **);
1737     void (*set)(Object *, const char *, Error **);
1738 } StringProperty;
1739
1740 static void property_get_str(Object *obj, Visitor *v, const char *name,
1741                              void *opaque, Error **errp)
1742 {
1743     StringProperty *prop = opaque;
1744     char *value;
1745     Error *err = NULL;
1746
1747     value = prop->get(obj, &err);
1748     if (err) {
1749         error_propagate(errp, err);
1750         return;
1751     }
1752
1753     visit_type_str(v, name, &value, errp);
1754     g_free(value);
1755 }
1756
1757 static void property_set_str(Object *obj, Visitor *v, const char *name,
1758                              void *opaque, Error **errp)
1759 {
1760     StringProperty *prop = opaque;
1761     char *value;
1762     Error *local_err = NULL;
1763
1764     visit_type_str(v, name, &value, &local_err);
1765     if (local_err) {
1766         error_propagate(errp, local_err);
1767         return;
1768     }
1769
1770     prop->set(obj, value, errp);
1771     g_free(value);
1772 }
1773
1774 static void property_release_str(Object *obj, const char *name,
1775                                  void *opaque)
1776 {
1777     StringProperty *prop = opaque;
1778     g_free(prop);
1779 }
1780
1781 void object_property_add_str(Object *obj, const char *name,
1782                            char *(*get)(Object *, Error **),
1783                            void (*set)(Object *, const char *, Error **),
1784                            Error **errp)
1785 {
1786     Error *local_err = NULL;
1787     StringProperty *prop = g_malloc0(sizeof(*prop));
1788
1789     prop->get = get;
1790     prop->set = set;
1791
1792     object_property_add(obj, name, "string",
1793                         get ? property_get_str : NULL,
1794                         set ? property_set_str : NULL,
1795                         property_release_str,
1796                         prop, &local_err);
1797     if (local_err) {
1798         error_propagate(errp, local_err);
1799         g_free(prop);
1800     }
1801 }
1802
1803 void object_class_property_add_str(ObjectClass *klass, const char *name,
1804                                    char *(*get)(Object *, Error **),
1805                                    void (*set)(Object *, const char *,
1806                                                Error **),
1807                                    Error **errp)
1808 {
1809     Error *local_err = NULL;
1810     StringProperty *prop = g_malloc0(sizeof(*prop));
1811
1812     prop->get = get;
1813     prop->set = set;
1814
1815     object_class_property_add(klass, name, "string",
1816                               get ? property_get_str : NULL,
1817                               set ? property_set_str : NULL,
1818                               property_release_str,
1819                               prop, &local_err);
1820     if (local_err) {
1821         error_propagate(errp, local_err);
1822         g_free(prop);
1823     }
1824 }
1825
1826 typedef struct BoolProperty
1827 {
1828     bool (*get)(Object *, Error **);
1829     void (*set)(Object *, bool, Error **);
1830 } BoolProperty;
1831
1832 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1833                               void *opaque, Error **errp)
1834 {
1835     BoolProperty *prop = opaque;
1836     bool value;
1837     Error *err = NULL;
1838
1839     value = prop->get(obj, &err);
1840     if (err) {
1841         error_propagate(errp, err);
1842         return;
1843     }
1844
1845     visit_type_bool(v, name, &value, errp);
1846 }
1847
1848 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1849                               void *opaque, Error **errp)
1850 {
1851     BoolProperty *prop = opaque;
1852     bool value;
1853     Error *local_err = NULL;
1854
1855     visit_type_bool(v, name, &value, &local_err);
1856     if (local_err) {
1857         error_propagate(errp, local_err);
1858         return;
1859     }
1860
1861     prop->set(obj, value, errp);
1862 }
1863
1864 static void property_release_bool(Object *obj, const char *name,
1865                                   void *opaque)
1866 {
1867     BoolProperty *prop = opaque;
1868     g_free(prop);
1869 }
1870
1871 void object_property_add_bool(Object *obj, const char *name,
1872                               bool (*get)(Object *, Error **),
1873                               void (*set)(Object *, bool, Error **),
1874                               Error **errp)
1875 {
1876     Error *local_err = NULL;
1877     BoolProperty *prop = g_malloc0(sizeof(*prop));
1878
1879     prop->get = get;
1880     prop->set = set;
1881
1882     object_property_add(obj, name, "bool",
1883                         get ? property_get_bool : NULL,
1884                         set ? property_set_bool : NULL,
1885                         property_release_bool,
1886                         prop, &local_err);
1887     if (local_err) {
1888         error_propagate(errp, local_err);
1889         g_free(prop);
1890     }
1891 }
1892
1893 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1894                                     bool (*get)(Object *, Error **),
1895                                     void (*set)(Object *, bool, Error **),
1896                                     Error **errp)
1897 {
1898     Error *local_err = NULL;
1899     BoolProperty *prop = g_malloc0(sizeof(*prop));
1900
1901     prop->get = get;
1902     prop->set = set;
1903
1904     object_class_property_add(klass, name, "bool",
1905                               get ? property_get_bool : NULL,
1906                               set ? property_set_bool : NULL,
1907                               property_release_bool,
1908                               prop, &local_err);
1909     if (local_err) {
1910         error_propagate(errp, local_err);
1911         g_free(prop);
1912     }
1913 }
1914
1915 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1916                               void *opaque, Error **errp)
1917 {
1918     EnumProperty *prop = opaque;
1919     int value;
1920     Error *err = NULL;
1921
1922     value = prop->get(obj, &err);
1923     if (err) {
1924         error_propagate(errp, err);
1925         return;
1926     }
1927
1928     visit_type_enum(v, name, &value, prop->strings, errp);
1929 }
1930
1931 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1932                               void *opaque, Error **errp)
1933 {
1934     EnumProperty *prop = opaque;
1935     int value;
1936     Error *err = NULL;
1937
1938     visit_type_enum(v, name, &value, prop->strings, &err);
1939     if (err) {
1940         error_propagate(errp, err);
1941         return;
1942     }
1943     prop->set(obj, value, errp);
1944 }
1945
1946 static void property_release_enum(Object *obj, const char *name,
1947                                   void *opaque)
1948 {
1949     EnumProperty *prop = opaque;
1950     g_free(prop);
1951 }
1952
1953 void object_property_add_enum(Object *obj, const char *name,
1954                               const char *typename,
1955                               const char * const *strings,
1956                               int (*get)(Object *, Error **),
1957                               void (*set)(Object *, int, Error **),
1958                               Error **errp)
1959 {
1960     Error *local_err = NULL;
1961     EnumProperty *prop = g_malloc(sizeof(*prop));
1962
1963     prop->strings = strings;
1964     prop->get = get;
1965     prop->set = set;
1966
1967     object_property_add(obj, name, typename,
1968                         get ? property_get_enum : NULL,
1969                         set ? property_set_enum : NULL,
1970                         property_release_enum,
1971                         prop, &local_err);
1972     if (local_err) {
1973         error_propagate(errp, local_err);
1974         g_free(prop);
1975     }
1976 }
1977
1978 void object_class_property_add_enum(ObjectClass *klass, const char *name,
1979                                     const char *typename,
1980                                     const char * const *strings,
1981                                     int (*get)(Object *, Error **),
1982                                     void (*set)(Object *, int, Error **),
1983                                     Error **errp)
1984 {
1985     Error *local_err = NULL;
1986     EnumProperty *prop = g_malloc(sizeof(*prop));
1987
1988     prop->strings = strings;
1989     prop->get = get;
1990     prop->set = set;
1991
1992     object_class_property_add(klass, name, typename,
1993                               get ? property_get_enum : NULL,
1994                               set ? property_set_enum : NULL,
1995                               property_release_enum,
1996                               prop, &local_err);
1997     if (local_err) {
1998         error_propagate(errp, local_err);
1999         g_free(prop);
2000     }
2001 }
2002
2003 typedef struct TMProperty {
2004     void (*get)(Object *, struct tm *, Error **);
2005 } TMProperty;
2006
2007 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2008                             void *opaque, Error **errp)
2009 {
2010     TMProperty *prop = opaque;
2011     Error *err = NULL;
2012     struct tm value;
2013
2014     prop->get(obj, &value, &err);
2015     if (err) {
2016         goto out;
2017     }
2018
2019     visit_start_struct(v, name, NULL, 0, &err);
2020     if (err) {
2021         goto out;
2022     }
2023     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2024     if (err) {
2025         goto out_end;
2026     }
2027     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2028     if (err) {
2029         goto out_end;
2030     }
2031     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2032     if (err) {
2033         goto out_end;
2034     }
2035     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2036     if (err) {
2037         goto out_end;
2038     }
2039     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2040     if (err) {
2041         goto out_end;
2042     }
2043     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2044     if (err) {
2045         goto out_end;
2046     }
2047     visit_check_struct(v, &err);
2048 out_end:
2049     visit_end_struct(v);
2050 out:
2051     error_propagate(errp, err);
2052
2053 }
2054
2055 static void property_release_tm(Object *obj, const char *name,
2056                                 void *opaque)
2057 {
2058     TMProperty *prop = opaque;
2059     g_free(prop);
2060 }
2061
2062 void object_property_add_tm(Object *obj, const char *name,
2063                             void (*get)(Object *, struct tm *, Error **),
2064                             Error **errp)
2065 {
2066     Error *local_err = NULL;
2067     TMProperty *prop = g_malloc0(sizeof(*prop));
2068
2069     prop->get = get;
2070
2071     object_property_add(obj, name, "struct tm",
2072                         get ? property_get_tm : NULL, NULL,
2073                         property_release_tm,
2074                         prop, &local_err);
2075     if (local_err) {
2076         error_propagate(errp, local_err);
2077         g_free(prop);
2078     }
2079 }
2080
2081 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2082                                   void (*get)(Object *, struct tm *, Error **),
2083                                   Error **errp)
2084 {
2085     Error *local_err = NULL;
2086     TMProperty *prop = g_malloc0(sizeof(*prop));
2087
2088     prop->get = get;
2089
2090     object_class_property_add(klass, name, "struct tm",
2091                               get ? property_get_tm : NULL, NULL,
2092                               property_release_tm,
2093                               prop, &local_err);
2094     if (local_err) {
2095         error_propagate(errp, local_err);
2096         g_free(prop);
2097     }
2098 }
2099
2100 static char *qdev_get_type(Object *obj, Error **errp)
2101 {
2102     return g_strdup(object_get_typename(obj));
2103 }
2104
2105 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2106                                    void *opaque, Error **errp)
2107 {
2108     uint8_t value = *(uint8_t *)opaque;
2109     visit_type_uint8(v, name, &value, errp);
2110 }
2111
2112 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2113                                     void *opaque, Error **errp)
2114 {
2115     uint16_t value = *(uint16_t *)opaque;
2116     visit_type_uint16(v, name, &value, errp);
2117 }
2118
2119 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2120                                     void *opaque, Error **errp)
2121 {
2122     uint32_t value = *(uint32_t *)opaque;
2123     visit_type_uint32(v, name, &value, errp);
2124 }
2125
2126 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2127                                     void *opaque, Error **errp)
2128 {
2129     uint64_t value = *(uint64_t *)opaque;
2130     visit_type_uint64(v, name, &value, errp);
2131 }
2132
2133 void object_property_add_uint8_ptr(Object *obj, const char *name,
2134                                    const uint8_t *v, Error **errp)
2135 {
2136     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2137                         NULL, NULL, (void *)v, errp);
2138 }
2139
2140 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2141                                          const uint8_t *v, Error **errp)
2142 {
2143     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2144                               NULL, NULL, (void *)v, errp);
2145 }
2146
2147 void object_property_add_uint16_ptr(Object *obj, const char *name,
2148                                     const uint16_t *v, Error **errp)
2149 {
2150     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2151                         NULL, NULL, (void *)v, errp);
2152 }
2153
2154 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2155                                           const uint16_t *v, Error **errp)
2156 {
2157     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2158                               NULL, NULL, (void *)v, errp);
2159 }
2160
2161 void object_property_add_uint32_ptr(Object *obj, const char *name,
2162                                     const uint32_t *v, Error **errp)
2163 {
2164     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2165                         NULL, NULL, (void *)v, errp);
2166 }
2167
2168 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2169                                           const uint32_t *v, Error **errp)
2170 {
2171     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2172                               NULL, NULL, (void *)v, errp);
2173 }
2174
2175 void object_property_add_uint64_ptr(Object *obj, const char *name,
2176                                     const uint64_t *v, Error **errp)
2177 {
2178     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2179                         NULL, NULL, (void *)v, errp);
2180 }
2181
2182 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2183                                           const uint64_t *v, Error **errp)
2184 {
2185     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2186                               NULL, NULL, (void *)v, errp);
2187 }
2188
2189 typedef struct {
2190     Object *target_obj;
2191     char *target_name;
2192 } AliasProperty;
2193
2194 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2195                                void *opaque, Error **errp)
2196 {
2197     AliasProperty *prop = opaque;
2198
2199     object_property_get(prop->target_obj, v, prop->target_name, errp);
2200 }
2201
2202 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2203                                void *opaque, Error **errp)
2204 {
2205     AliasProperty *prop = opaque;
2206
2207     object_property_set(prop->target_obj, v, prop->target_name, errp);
2208 }
2209
2210 static Object *property_resolve_alias(Object *obj, void *opaque,
2211                                       const gchar *part)
2212 {
2213     AliasProperty *prop = opaque;
2214
2215     return object_resolve_path_component(prop->target_obj, prop->target_name);
2216 }
2217
2218 static void property_release_alias(Object *obj, const char *name, void *opaque)
2219 {
2220     AliasProperty *prop = opaque;
2221
2222     g_free(prop->target_name);
2223     g_free(prop);
2224 }
2225
2226 void object_property_add_alias(Object *obj, const char *name,
2227                                Object *target_obj, const char *target_name,
2228                                Error **errp)
2229 {
2230     AliasProperty *prop;
2231     ObjectProperty *op;
2232     ObjectProperty *target_prop;
2233     gchar *prop_type;
2234     Error *local_err = NULL;
2235
2236     target_prop = object_property_find(target_obj, target_name, errp);
2237     if (!target_prop) {
2238         return;
2239     }
2240
2241     if (object_property_is_child(target_prop)) {
2242         prop_type = g_strdup_printf("link%s",
2243                                     target_prop->type + strlen("child"));
2244     } else {
2245         prop_type = g_strdup(target_prop->type);
2246     }
2247
2248     prop = g_malloc(sizeof(*prop));
2249     prop->target_obj = target_obj;
2250     prop->target_name = g_strdup(target_name);
2251
2252     op = object_property_add(obj, name, prop_type,
2253                              property_get_alias,
2254                              property_set_alias,
2255                              property_release_alias,
2256                              prop, &local_err);
2257     if (local_err) {
2258         error_propagate(errp, local_err);
2259         g_free(prop);
2260         goto out;
2261     }
2262     op->resolve = property_resolve_alias;
2263
2264     object_property_set_description(obj, op->name,
2265                                     target_prop->description,
2266                                     &error_abort);
2267
2268 out:
2269     g_free(prop_type);
2270 }
2271
2272 void object_property_set_description(Object *obj, const char *name,
2273                                      const char *description, Error **errp)
2274 {
2275     ObjectProperty *op;
2276
2277     op = object_property_find(obj, name, errp);
2278     if (!op) {
2279         return;
2280     }
2281
2282     g_free(op->description);
2283     op->description = g_strdup(description);
2284 }
2285
2286 void object_class_property_set_description(ObjectClass *klass,
2287                                            const char *name,
2288                                            const char *description,
2289                                            Error **errp)
2290 {
2291     ObjectProperty *op;
2292
2293     op = g_hash_table_lookup(klass->properties, name);
2294     if (!op) {
2295         error_setg(errp, "Property '.%s' not found", name);
2296         return;
2297     }
2298
2299     g_free(op->description);
2300     op->description = g_strdup(description);
2301 }
2302
2303 static void object_instance_init(Object *obj)
2304 {
2305     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2306 }
2307
2308 static void register_types(void)
2309 {
2310     static TypeInfo interface_info = {
2311         .name = TYPE_INTERFACE,
2312         .class_size = sizeof(InterfaceClass),
2313         .abstract = true,
2314     };
2315
2316     static TypeInfo object_info = {
2317         .name = TYPE_OBJECT,
2318         .instance_size = sizeof(Object),
2319         .instance_init = object_instance_init,
2320         .abstract = true,
2321     };
2322
2323     type_interface = type_register_internal(&interface_info);
2324     type_register_internal(&object_info);
2325 }
2326
2327 type_init(register_types)