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 "hw/qdev-core.h"
  15 #include "qapi/error.h"
  16 #include "qom/object.h"
  17 #include "qom/object_interfaces.h"
  18 #include "qemu/cutils.h"
  19 #include "qapi/visitor.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qobject-input-visitor.h"
  23 #include "qapi/forward-visitor.h"
  24 #include "qapi/qapi-builtin-visit.h"
  25 #include "qapi/qmp/qerror.h"
  26 #include "qapi/qmp/qjson.h"
  27 #include "trace.h"
  28
  29 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  30  * of the QOM core on QObject?  */
  31 #include "qom/qom-qobject.h"
  32 #include "qapi/qmp/qbool.h"
  33 #include "qapi/qmp/qnum.h"
  34 #include "qapi/qmp/qstring.h"
  35 #include "qemu/error-report.h"
  36
  37 #define MAX_INTERFACES 32
  38
  39 typedef struct InterfaceImpl InterfaceImpl;
  40 typedef struct TypeImpl TypeImpl;
  41
  42 struct InterfaceImpl
  43 {
  44     const char *typename;
  45 };
  46
  47 struct TypeImpl
  48 {
  49     const char *name;
  50
  51     size_t class_size;
  52
  53     size_t instance_size;
  54     size_t instance_align;
  55
  56     void (*class_init)(ObjectClass *klass, void *data);
  57     void (*class_base_init)(ObjectClass *klass, void *data);
  58
  59     void *class_data;
  60
  61     void (*instance_init)(Object *obj);
  62     void (*instance_post_init)(Object *obj);
  63     void (*instance_finalize)(Object *obj);
  64
  65     bool abstract;
  66
  67     const char *parent;
  68     TypeImpl *parent_type;
  69
  70     ObjectClass *class;
  71
  72     int num_interfaces;
  73     InterfaceImpl interfaces[MAX_INTERFACES];
  74 };
  75
  76 static Type type_interface;
  77
  78 static GHashTable *type_table_get(void)
  79 {
  80     static GHashTable *type_table;
  81
  82     if (type_table == NULL) {
  83         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  84     }
  85
  86     return type_table;
  87 }
  88
  89 static bool enumerating_types;
  90
  91 static void type_table_add(TypeImpl *ti)
  92 {
  93     assert(!enumerating_types);
  94     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  95 }
  96
  97 static TypeImpl *type_table_lookup(const char *name)
  98 {
  99     return g_hash_table_lookup(type_table_get(), name);
 100 }
 101
 102 static TypeImpl *type_new(const TypeInfo *info)
 103 {
 104     TypeImpl *ti = g_malloc0(sizeof(*ti));
 105     int i;
 106
 107     g_assert(info->name != NULL);
 108
 109     if (type_table_lookup(info->name) != NULL) {
 110         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 111         abort();
 112     }
 113
 114     ti->name = g_strdup(info->name);
 115     ti->parent = g_strdup(info->parent);
 116
 117     ti->class_size = info->class_size;
 118     ti->instance_size = info->instance_size;
 119     ti->instance_align = info->instance_align;
 120
 121     ti->class_init = info->class_init;
 122     ti->class_base_init = info->class_base_init;
 123     ti->class_data = info->class_data;
 124
 125     ti->instance_init = info->instance_init;
 126     ti->instance_post_init = info->instance_post_init;
 127     ti->instance_finalize = info->instance_finalize;
 128
 129     ti->abstract = info->abstract;
 130
 131     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 132         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 133     }
 134     ti->num_interfaces = i;
 135
 136     return ti;
 137 }
 138
 139 static TypeImpl *type_register_internal(const TypeInfo *info)
 140 {
 141     TypeImpl *ti;
 142     ti = type_new(info);
 143
 144     type_table_add(ti);
 145     return ti;
 146 }
 147
 148 TypeImpl *type_register(const TypeInfo *info)
 149 {
 150     assert(info->parent);
 151     return type_register_internal(info);
 152 }
 153
 154 TypeImpl *type_register_static(const TypeInfo *info)
 155 {
 156     return type_register(info);
 157 }
 158
 159 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 160 {
 161     int i;
 162
 163     for (i = 0; i < nr_infos; i++) {
 164         type_register_static(&infos[i]);
 165     }
 166 }
 167
 168 static TypeImpl *type_get_by_name(const char *name)
 169 {
 170     if (name == NULL) {
 171         return NULL;
 172     }
 173
 174     return type_table_lookup(name);
 175 }
 176
 177 static TypeImpl *type_get_parent(TypeImpl *type)
 178 {
 179     if (!type->parent_type && type->parent) {
 180         type->parent_type = type_get_by_name(type->parent);
 181         if (!type->parent_type) {
 182             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
 183                     type->name, type->parent);
 184             abort();
 185         }
 186     }
 187
 188     return type->parent_type;
 189 }
 190
 191 static bool type_has_parent(TypeImpl *type)
 192 {
 193     return (type->parent != NULL);
 194 }
 195
 196 static size_t type_class_get_size(TypeImpl *ti)
 197 {
 198     if (ti->class_size) {
 199         return ti->class_size;
 200     }
 201
 202     if (type_has_parent(ti)) {
 203         return type_class_get_size(type_get_parent(ti));
 204     }
 205
 206     return sizeof(ObjectClass);
 207 }
 208
 209 static size_t type_object_get_size(TypeImpl *ti)
 210 {
 211     if (ti->instance_size) {
 212         return ti->instance_size;
 213     }
 214
 215     if (type_has_parent(ti)) {
 216         return type_object_get_size(type_get_parent(ti));
 217     }
 218
 219     return 0;
 220 }
 221
 222 size_t object_type_get_instance_size(const char *typename)
 223 {
 224     TypeImpl *type = type_get_by_name(typename);
 225
 226     g_assert(type != NULL);
 227     return type_object_get_size(type);
 228 }
 229
 230 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 231 {
 232     assert(target_type);
 233
 234     /* Check if target_type is a direct ancestor of type */
 235     while (type) {
 236         if (type == target_type) {
 237             return true;
 238         }
 239
 240         type = type_get_parent(type);
 241     }
 242
 243     return false;
 244 }
 245
 246 static void type_initialize(TypeImpl *ti);
 247
 248 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 249                                       TypeImpl *parent_type)
 250 {
 251     InterfaceClass *new_iface;
 252     TypeInfo info = { };
 253     TypeImpl *iface_impl;
 254
 255     info.parent = parent_type->name;
 256     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 257     info.abstract = true;
 258
 259     iface_impl = type_new(&info);
 260     iface_impl->parent_type = parent_type;
 261     type_initialize(iface_impl);
 262     g_free((char *)info.name);
 263
 264     new_iface = (InterfaceClass *)iface_impl->class;
 265     new_iface->concrete_class = ti->class;
 266     new_iface->interface_type = interface_type;
 267
 268     ti->class->interfaces = g_slist_append(ti->class->interfaces, new_iface);
 269 }
 270
 271 static void object_property_free(gpointer data)
 272 {
 273     ObjectProperty *prop = data;
 274
 275     if (prop->defval) {
 276         qobject_unref(prop->defval);
 277         prop->defval = NULL;
 278     }
 279     g_free(prop->name);
 280     g_free(prop->type);
 281     g_free(prop->description);
 282     g_free(prop);
 283 }
 284
 285 static void type_initialize(TypeImpl *ti)
 286 {
 287     TypeImpl *parent;
 288
 289     if (ti->class) {
 290         return;
 291     }
 292
 293     ti->class_size = type_class_get_size(ti);
 294     ti->instance_size = type_object_get_size(ti);
 295     /* Any type with zero instance_size is implicitly abstract.
 296      * This means interface types are all abstract.
 297      */
 298     if (ti->instance_size == 0) {
 299         ti->abstract = true;
 300     }
 301     if (type_is_ancestor(ti, type_interface)) {
 302         assert(ti->instance_size == 0);
 303         assert(ti->abstract);
 304         assert(!ti->instance_init);
 305         assert(!ti->instance_post_init);
 306         assert(!ti->instance_finalize);
 307         assert(!ti->num_interfaces);
 308     }
 309     ti->class = g_malloc0(ti->class_size);
 310
 311     parent = type_get_parent(ti);
 312     if (parent) {
 313         type_initialize(parent);
 314         GSList *e;
 315         int i;
 316
 317         g_assert(parent->class_size <= ti->class_size);
 318         g_assert(parent->instance_size <= ti->instance_size);
 319         memcpy(ti->class, parent->class, parent->class_size);
 320         ti->class->interfaces = NULL;
 321
 322         for (e = parent->class->interfaces; e; e = e->next) {
 323             InterfaceClass *iface = e->data;
 324             ObjectClass *klass = OBJECT_CLASS(iface);
 325
 326             type_initialize_interface(ti, iface->interface_type, klass->type);
 327         }
 328
 329         for (i = 0; i < ti->num_interfaces; i++) {
 330             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 331             if (!t) {
 332                 error_report("missing interface '%s' for object '%s'",
 333                              ti->interfaces[i].typename, parent->name);
 334                 abort();
 335             }
 336             for (e = ti->class->interfaces; e; e = e->next) {
 337                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 338
 339                 if (type_is_ancestor(target_type, t)) {
 340                     break;
 341                 }
 342             }
 343
 344             if (e) {
 345                 continue;
 346             }
 347
 348             type_initialize_interface(ti, t, t);
 349         }
 350     }
 351
 352     ti->class->properties = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
 353                                                   object_property_free);
 354
 355     ti->class->type = ti;
 356
 357     while (parent) {
 358         if (parent->class_base_init) {
 359             parent->class_base_init(ti->class, ti->class_data);
 360         }
 361         parent = type_get_parent(parent);
 362     }
 363
 364     if (ti->class_init) {
 365         ti->class_init(ti->class, ti->class_data);
 366     }
 367 }
 368
 369 static void object_init_with_type(Object *obj, TypeImpl *ti)
 370 {
 371     if (type_has_parent(ti)) {
 372         object_init_with_type(obj, type_get_parent(ti));
 373     }
 374
 375     if (ti->instance_init) {
 376         ti->instance_init(obj);
 377     }
 378 }
 379
 380 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 381 {
 382     if (ti->instance_post_init) {
 383         ti->instance_post_init(obj);
 384     }
 385
 386     if (type_has_parent(ti)) {
 387         object_post_init_with_type(obj, type_get_parent(ti));
 388     }
 389 }
 390
 391 bool object_apply_global_props(Object *obj, const GPtrArray *props,
 392                                Error **errp)
 393 {
 394     int i;
 395
 396     if (!props) {
 397         return true;
 398     }
 399
 400     for (i = 0; i < props->len; i++) {
 401         GlobalProperty *p = g_ptr_array_index(props, i);
 402         Error *err = NULL;
 403
 404         if (object_dynamic_cast(obj, p->driver) == NULL) {
 405             continue;
 406         }
 407         if (p->optional && !object_property_find(obj, p->property)) {
 408             continue;
 409         }
 410         p->used = true;
 411         if (!object_property_parse(obj, p->property, p->value, &err)) {
 412             error_prepend(&err, "can't apply global %s.%s=%s: ",
 413                           p->driver, p->property, p->value);
 414             /*
 415              * If errp != NULL, propagate error and return.
 416              * If errp == NULL, report a warning, but keep going
 417              * with the remaining globals.
 418              */
 419             if (errp) {
 420                 error_propagate(errp, err);
 421                 return false;
 422             } else {
 423                 warn_report_err(err);
 424             }
 425         }
 426     }
 427
 428     return true;
 429 }
 430
 431 /*
 432  * Global property defaults
 433  * Slot 0: accelerator's global property defaults
 434  * Slot 1: machine's global property defaults
 435  * Slot 2: global properties from legacy command line option
 436  * Each is a GPtrArray of of GlobalProperty.
 437  * Applied in order, later entries override earlier ones.
 438  */
 439 static GPtrArray *object_compat_props[3];
 440
 441 /*
 442  * Retrieve @GPtrArray for global property defined with options
 443  * other than "-global".  These are generally used for syntactic
 444  * sugar and legacy command line options.
 445  */
 446 void object_register_sugar_prop(const char *driver, const char *prop,
 447                                 const char *value, bool optional)
 448 {
 449     GlobalProperty *g;
 450     if (!object_compat_props[2]) {
 451         object_compat_props[2] = g_ptr_array_new();
 452     }
 453     g = g_new0(GlobalProperty, 1);
 454     g->driver = g_strdup(driver);
 455     g->property = g_strdup(prop);
 456     g->value = g_strdup(value);
 457     g->optional = optional;
 458     g_ptr_array_add(object_compat_props[2], g);
 459 }
 460
 461 /*
 462  * Set machine's global property defaults to @compat_props.
 463  * May be called at most once.
 464  */
 465 void object_set_machine_compat_props(GPtrArray *compat_props)
 466 {
 467     assert(!object_compat_props[1]);
 468     object_compat_props[1] = compat_props;
 469 }
 470
 471 /*
 472  * Set accelerator's global property defaults to @compat_props.
 473  * May be called at most once.
 474  */
 475 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 476 {
 477     assert(!object_compat_props[0]);
 478     object_compat_props[0] = compat_props;
 479 }
 480
 481 void object_apply_compat_props(Object *obj)
 482 {
 483     int i;
 484
 485     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 486         object_apply_global_props(obj, object_compat_props[i],
 487                                   i == 2 ? &error_fatal : &error_abort);
 488     }
 489 }
 490
 491 static void object_class_property_init_all(Object *obj)
 492 {
 493     ObjectPropertyIterator iter;
 494     ObjectProperty *prop;
 495
 496     object_class_property_iter_init(&iter, object_get_class(obj));
 497     while ((prop = object_property_iter_next(&iter))) {
 498         if (prop->init) {
 499             prop->init(obj, prop);
 500         }
 501     }
 502 }
 503
 504 static void object_initialize_with_type(Object *obj, size_t size, TypeImpl *type)
 505 {
 506     type_initialize(type);
 507
 508     g_assert(type->instance_size >= sizeof(Object));
 509     g_assert(type->abstract == false);
 510     g_assert(size >= type->instance_size);
 511
 512     memset(obj, 0, type->instance_size);
 513     obj->class = type->class;
 514     object_ref(obj);
 515     object_class_property_init_all(obj);
 516     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 517                                             NULL, object_property_free);
 518     object_init_with_type(obj, type);
 519     object_post_init_with_type(obj, type);
 520 }
 521
 522 void object_initialize(void *data, size_t size, const char *typename)
 523 {
 524     TypeImpl *type = type_get_by_name(typename);
 525
 526 #ifdef CONFIG_MODULES
 527     if (!type) {
 528         module_load_qom_one(typename);
 529         type = type_get_by_name(typename);
 530     }
 531 #endif
 532     if (!type) {
 533         error_report("missing object type '%s'", typename);
 534         abort();
 535     }
 536
 537     object_initialize_with_type(data, size, type);
 538 }
 539
 540 bool object_initialize_child_with_props(Object *parentobj,
 541                                         const char *propname,
 542                                         void *childobj, size_t size,
 543                                         const char *type,
 544                                         Error **errp, ...)
 545 {
 546     va_list vargs;
 547     bool ok;
 548
 549     va_start(vargs, errp);
 550     ok = object_initialize_child_with_propsv(parentobj, propname,
 551                                              childobj, size, type, errp,
 552                                              vargs);
 553     va_end(vargs);
 554     return ok;
 555 }
 556
 557 bool object_initialize_child_with_propsv(Object *parentobj,
 558                                          const char *propname,
 559                                          void *childobj, size_t size,
 560                                          const char *type,
 561                                          Error **errp, va_list vargs)
 562 {
 563     bool ok = false;
 564     Object *obj;
 565     UserCreatable *uc;
 566
 567     object_initialize(childobj, size, type);
 568     obj = OBJECT(childobj);
 569
 570     if (!object_set_propv(obj, errp, vargs)) {
 571         goto out;
 572     }
 573
 574     object_property_add_child(parentobj, propname, obj);
 575
 576     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 577     if (uc) {
 578         if (!user_creatable_complete(uc, errp)) {
 579             object_unparent(obj);
 580             goto out;
 581         }
 582     }
 583
 584     ok = true;
 585
 586 out:
 587     /*
 588      * We want @obj's reference to be 1 on success, 0 on failure.
 589      * On success, it's 2: one taken by object_initialize(), and one
 590      * by object_property_add_child().
 591      * On failure in object_initialize() or earlier, it's 1.
 592      * On failure afterwards, it's also 1: object_unparent() releases
 593      * the reference taken by object_property_add_child().
 594      */
 595     object_unref(obj);
 596     return ok;
 597 }
 598
 599 void object_initialize_child_internal(Object *parent,
 600                                       const char *propname,
 601                                       void *child, size_t size,
 602                                       const char *type)
 603 {
 604     object_initialize_child_with_props(parent, propname, child, size, type,
 605                                        &error_abort, NULL);
 606 }
 607
 608 static inline bool object_property_is_child(ObjectProperty *prop)
 609 {
 610     return strstart(prop->type, "child<", NULL);
 611 }
 612
 613 static void object_property_del_all(Object *obj)
 614 {
 615     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
 616     ObjectProperty *prop;
 617     ObjectPropertyIterator iter;
 618     bool released;
 619
 620     do {
 621         released = false;
 622         object_property_iter_init(&iter, obj);
 623         while ((prop = object_property_iter_next(&iter)) != NULL) {
 624             if (g_hash_table_add(done, prop)) {
 625                 if (prop->release) {
 626                     prop->release(obj, prop->name, prop->opaque);
 627                     released = true;
 628                     break;
 629                 }
 630             }
 631         }
 632     } while (released);
 633
 634     g_hash_table_unref(obj->properties);
 635 }
 636
 637 static void object_property_del_child(Object *obj, Object *child)
 638 {
 639     ObjectProperty *prop;
 640     GHashTableIter iter;
 641     gpointer key, value;
 642
 643     g_hash_table_iter_init(&iter, obj->properties);
 644     while (g_hash_table_iter_next(&iter, &key, &value)) {
 645         prop = value;
 646         if (object_property_is_child(prop) && prop->opaque == child) {
 647             if (prop->release) {
 648                 prop->release(obj, prop->name, prop->opaque);
 649                 prop->release = NULL;
 650             }
 651             break;
 652         }
 653     }
 654     g_hash_table_iter_init(&iter, obj->properties);
 655     while (g_hash_table_iter_next(&iter, &key, &value)) {
 656         prop = value;
 657         if (object_property_is_child(prop) && prop->opaque == child) {
 658             g_hash_table_iter_remove(&iter);
 659             break;
 660         }
 661     }
 662 }
 663
 664 void object_unparent(Object *obj)
 665 {
 666     if (obj->parent) {
 667         object_property_del_child(obj->parent, obj);
 668     }
 669 }
 670
 671 static void object_deinit(Object *obj, TypeImpl *type)
 672 {
 673     if (type->instance_finalize) {
 674         type->instance_finalize(obj);
 675     }
 676
 677     if (type_has_parent(type)) {
 678         object_deinit(obj, type_get_parent(type));
 679     }
 680 }
 681
 682 static void object_finalize(void *data)
 683 {
 684     Object *obj = data;
 685     TypeImpl *ti = obj->class->type;
 686
 687     object_property_del_all(obj);
 688     object_deinit(obj, ti);
 689
 690     g_assert(obj->ref == 0);
 691     g_assert(obj->parent == NULL);
 692     if (obj->free) {
 693         obj->free(obj);
 694     }
 695 }
 696
 697 /* Find the minimum alignment guaranteed by the system malloc. */
 698 #if __STDC_VERSION__ >= 201112L
 699 typedef max_align_t qemu_max_align_t;
 700 #else
 701 typedef union {
 702     long l;
 703     void *p;
 704     double d;
 705     long double ld;
 706 } qemu_max_align_t;
 707 #endif
 708
 709 static Object *object_new_with_type(Type type)
 710 {
 711     Object *obj;
 712     size_t size, align;
 713     void (*obj_free)(void *);
 714
 715     g_assert(type != NULL);
 716     type_initialize(type);
 717
 718     size = type->instance_size;
 719     align = type->instance_align;
 720
 721     /*
 722      * Do not use qemu_memalign unless required.  Depending on the
 723      * implementation, extra alignment implies extra overhead.
 724      */
 725     if (likely(align <= __alignof__(qemu_max_align_t))) {
 726         obj = g_malloc(size);
 727         obj_free = g_free;
 728     } else {
 729         obj = qemu_memalign(align, size);
 730         obj_free = qemu_vfree;
 731     }
 732
 733     object_initialize_with_type(obj, size, type);
 734     obj->free = obj_free;
 735
 736     return obj;
 737 }
 738
 739 Object *object_new_with_class(ObjectClass *klass)
 740 {
 741     return object_new_with_type(klass->type);
 742 }
 743
 744 Object *object_new(const char *typename)
 745 {
 746     TypeImpl *ti = type_get_by_name(typename);
 747
 748     return object_new_with_type(ti);
 749 }
 750
 751
 752 Object *object_new_with_props(const char *typename,
 753                               Object *parent,
 754                               const char *id,
 755                               Error **errp,
 756                               ...)
 757 {
 758     va_list vargs;
 759     Object *obj;
 760
 761     va_start(vargs, errp);
 762     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 763     va_end(vargs);
 764
 765     return obj;
 766 }
 767
 768
 769 Object *object_new_with_propv(const char *typename,
 770                               Object *parent,
 771                               const char *id,
 772                               Error **errp,
 773                               va_list vargs)
 774 {
 775     Object *obj;
 776     ObjectClass *klass;
 777     UserCreatable *uc;
 778
 779     klass = object_class_by_name(typename);
 780     if (!klass) {
 781         error_setg(errp, "invalid object type: %s", typename);
 782         return NULL;
 783     }
 784
 785     if (object_class_is_abstract(klass)) {
 786         error_setg(errp, "object type '%s' is abstract", typename);
 787         return NULL;
 788     }
 789     obj = object_new_with_type(klass->type);
 790
 791     if (!object_set_propv(obj, errp, vargs)) {
 792         goto error;
 793     }
 794
 795     if (id != NULL) {
 796         object_property_add_child(parent, id, obj);
 797     }
 798
 799     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 800     if (uc) {
 801         if (!user_creatable_complete(uc, errp)) {
 802             if (id != NULL) {
 803                 object_unparent(obj);
 804             }
 805             goto error;
 806         }
 807     }
 808
 809     object_unref(obj);
 810     return obj;
 811
 812  error:
 813     object_unref(obj);
 814     return NULL;
 815 }
 816
 817
 818 bool object_set_props(Object *obj,
 819                      Error **errp,
 820                      ...)
 821 {
 822     va_list vargs;
 823     bool ret;
 824
 825     va_start(vargs, errp);
 826     ret = object_set_propv(obj, errp, vargs);
 827     va_end(vargs);
 828
 829     return ret;
 830 }
 831
 832
 833 bool object_set_propv(Object *obj,
 834                      Error **errp,
 835                      va_list vargs)
 836 {
 837     const char *propname;
 838
 839     propname = va_arg(vargs, char *);
 840     while (propname != NULL) {
 841         const char *value = va_arg(vargs, char *);
 842
 843         g_assert(value != NULL);
 844         if (!object_property_parse(obj, propname, value, errp)) {
 845             return false;
 846         }
 847         propname = va_arg(vargs, char *);
 848     }
 849
 850     return true;
 851 }
 852
 853
 854 Object *object_dynamic_cast(Object *obj, const char *typename)
 855 {
 856     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 857         return obj;
 858     }
 859
 860     return NULL;
 861 }
 862
 863 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 864                                    const char *file, int line, const char *func)
 865 {
 866     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 867                                      typename, file, line, func);
 868
 869 #ifdef CONFIG_QOM_CAST_DEBUG
 870     int i;
 871     Object *inst;
 872
 873     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 874         if (qatomic_read(&obj->class->object_cast_cache[i]) == typename) {
 875             goto out;
 876         }
 877     }
 878
 879     inst = object_dynamic_cast(obj, typename);
 880
 881     if (!inst && obj) {
 882         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 883                 file, line, func, obj, typename);
 884         abort();
 885     }
 886
 887     assert(obj == inst);
 888
 889     if (obj && obj == inst) {
 890         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 891             qatomic_set(&obj->class->object_cast_cache[i - 1],
 892                        qatomic_read(&obj->class->object_cast_cache[i]));
 893         }
 894         qatomic_set(&obj->class->object_cast_cache[i - 1], typename);
 895     }
 896
 897 out:
 898 #endif
 899     return obj;
 900 }
 901
 902 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 903                                        const char *typename)
 904 {
 905     ObjectClass *ret = NULL;
 906     TypeImpl *target_type;
 907     TypeImpl *type;
 908
 909     if (!class) {
 910         return NULL;
 911     }
 912
 913     /* A simple fast path that can trigger a lot for leaf classes.  */
 914     type = class->type;
 915     if (type->name == typename) {
 916         return class;
 917     }
 918
 919     target_type = type_get_by_name(typename);
 920     if (!target_type) {
 921         /* target class type unknown, so fail the cast */
 922         return NULL;
 923     }
 924
 925     if (type->class->interfaces &&
 926             type_is_ancestor(target_type, type_interface)) {
 927         int found = 0;
 928         GSList *i;
 929
 930         for (i = class->interfaces; i; i = i->next) {
 931             ObjectClass *target_class = i->data;
 932
 933             if (type_is_ancestor(target_class->type, target_type)) {
 934                 ret = target_class;
 935                 found++;
 936             }
 937          }
 938
 939         /* The match was ambiguous, don't allow a cast */
 940         if (found > 1) {
 941             ret = NULL;
 942         }
 943     } else if (type_is_ancestor(type, target_type)) {
 944         ret = class;
 945     }
 946
 947     return ret;
 948 }
 949
 950 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 951                                               const char *typename,
 952                                               const char *file, int line,
 953                                               const char *func)
 954 {
 955     ObjectClass *ret;
 956
 957     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 958                                            typename, file, line, func);
 959
 960 #ifdef CONFIG_QOM_CAST_DEBUG
 961     int i;
 962
 963     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 964         if (qatomic_read(&class->class_cast_cache[i]) == typename) {
 965             ret = class;
 966             goto out;
 967         }
 968     }
 969 #else
 970     if (!class || !class->interfaces) {
 971         return class;
 972     }
 973 #endif
 974
 975     ret = object_class_dynamic_cast(class, typename);
 976     if (!ret && class) {
 977         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 978                 file, line, func, class, typename);
 979         abort();
 980     }
 981
 982 #ifdef CONFIG_QOM_CAST_DEBUG
 983     if (class && ret == class) {
 984         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 985             qatomic_set(&class->class_cast_cache[i - 1],
 986                        qatomic_read(&class->class_cast_cache[i]));
 987         }
 988         qatomic_set(&class->class_cast_cache[i - 1], typename);
 989     }
 990 out:
 991 #endif
 992     return ret;
 993 }
 994
 995 const char *object_get_typename(const Object *obj)
 996 {
 997     return obj->class->type->name;
 998 }
 999
1000 ObjectClass *object_get_class(Object *obj)
1001 {
1002     return obj->class;
1003 }
1004
1005 bool object_class_is_abstract(ObjectClass *klass)
1006 {
1007     return klass->type->abstract;
1008 }
1009
1010 const char *object_class_get_name(ObjectClass *klass)
1011 {
1012     return klass->type->name;
1013 }
1014
1015 ObjectClass *object_class_by_name(const char *typename)
1016 {
1017     TypeImpl *type = type_get_by_name(typename);
1018
1019     if (!type) {
1020         return NULL;
1021     }
1022
1023     type_initialize(type);
1024
1025     return type->class;
1026 }
1027
1028 ObjectClass *module_object_class_by_name(const char *typename)
1029 {
1030     ObjectClass *oc;
1031
1032     oc = object_class_by_name(typename);
1033 #ifdef CONFIG_MODULES
1034     if (!oc) {
1035         module_load_qom_one(typename);
1036         oc = object_class_by_name(typename);
1037     }
1038 #endif
1039     return oc;
1040 }
1041
1042 ObjectClass *object_class_get_parent(ObjectClass *class)
1043 {
1044     TypeImpl *type = type_get_parent(class->type);
1045
1046     if (!type) {
1047         return NULL;
1048     }
1049
1050     type_initialize(type);
1051
1052     return type->class;
1053 }
1054
1055 typedef struct OCFData
1056 {
1057     void (*fn)(ObjectClass *klass, void *opaque);
1058     const char *implements_type;
1059     bool include_abstract;
1060     void *opaque;
1061 } OCFData;
1062
1063 static void object_class_foreach_tramp(gpointer key, gpointer value,
1064                                        gpointer opaque)
1065 {
1066     OCFData *data = opaque;
1067     TypeImpl *type = value;
1068     ObjectClass *k;
1069
1070     type_initialize(type);
1071     k = type->class;
1072
1073     if (!data->include_abstract && type->abstract) {
1074         return;
1075     }
1076
1077     if (data->implements_type &&
1078         !object_class_dynamic_cast(k, data->implements_type)) {
1079         return;
1080     }
1081
1082     data->fn(k, data->opaque);
1083 }
1084
1085 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
1086                           const char *implements_type, bool include_abstract,
1087                           void *opaque)
1088 {
1089     OCFData data = { fn, implements_type, include_abstract, opaque };
1090
1091     enumerating_types = true;
1092     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
1093     enumerating_types = false;
1094 }
1095
1096 static int do_object_child_foreach(Object *obj,
1097                                    int (*fn)(Object *child, void *opaque),
1098                                    void *opaque, bool recurse)
1099 {
1100     GHashTableIter iter;
1101     ObjectProperty *prop;
1102     int ret = 0;
1103
1104     g_hash_table_iter_init(&iter, obj->properties);
1105     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1106         if (object_property_is_child(prop)) {
1107             Object *child = prop->opaque;
1108
1109             ret = fn(child, opaque);
1110             if (ret != 0) {
1111                 break;
1112             }
1113             if (recurse) {
1114                 ret = do_object_child_foreach(child, fn, opaque, true);
1115                 if (ret != 0) {
1116                     break;
1117                 }
1118             }
1119         }
1120     }
1121     return ret;
1122 }
1123
1124 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1125                          void *opaque)
1126 {
1127     return do_object_child_foreach(obj, fn, opaque, false);
1128 }
1129
1130 int object_child_foreach_recursive(Object *obj,
1131                                    int (*fn)(Object *child, void *opaque),
1132                                    void *opaque)
1133 {
1134     return do_object_child_foreach(obj, fn, opaque, true);
1135 }
1136
1137 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1138 {
1139     GSList **list = opaque;
1140
1141     *list = g_slist_prepend(*list, klass);
1142 }
1143
1144 GSList *object_class_get_list(const char *implements_type,
1145                               bool include_abstract)
1146 {
1147     GSList *list = NULL;
1148
1149     object_class_foreach(object_class_get_list_tramp,
1150                          implements_type, include_abstract, &list);
1151     return list;
1152 }
1153
1154 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1155 {
1156     return strcasecmp(object_class_get_name((ObjectClass *)a),
1157                       object_class_get_name((ObjectClass *)b));
1158 }
1159
1160 GSList *object_class_get_list_sorted(const char *implements_type,
1161                                      bool include_abstract)
1162 {
1163     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1164                         object_class_cmp);
1165 }
1166
1167 Object *object_ref(void *objptr)
1168 {
1169     Object *obj = OBJECT(objptr);
1170     if (!obj) {
1171         return NULL;
1172     }
1173     qatomic_inc(&obj->ref);
1174     return obj;
1175 }
1176
1177 void object_unref(void *objptr)
1178 {
1179     Object *obj = OBJECT(objptr);
1180     if (!obj) {
1181         return;
1182     }
1183     g_assert(obj->ref > 0);
1184
1185     /* parent always holds a reference to its children */
1186     if (qatomic_fetch_dec(&obj->ref) == 1) {
1187         object_finalize(obj);
1188     }
1189 }
1190
1191 ObjectProperty *
1192 object_property_try_add(Object *obj, const char *name, const char *type,
1193                         ObjectPropertyAccessor *get,
1194                         ObjectPropertyAccessor *set,
1195                         ObjectPropertyRelease *release,
1196                         void *opaque, Error **errp)
1197 {
1198     ObjectProperty *prop;
1199     size_t name_len = strlen(name);
1200
1201     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1202         int i;
1203         ObjectProperty *ret = NULL;
1204         char *name_no_array = g_strdup(name);
1205
1206         name_no_array[name_len - 3] = '\0';
1207         for (i = 0; i < INT16_MAX; ++i) {
1208             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1209
1210             ret = object_property_try_add(obj, full_name, type, get, set,
1211                                           release, opaque, NULL);
1212             g_free(full_name);
1213             if (ret) {
1214                 break;
1215             }
1216         }
1217         g_free(name_no_array);
1218         assert(ret);
1219         return ret;
1220     }
1221
1222     if (object_property_find(obj, name) != NULL) {
1223         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1224                    name, object_get_typename(obj));
1225         return NULL;
1226     }
1227
1228     prop = g_malloc0(sizeof(*prop));
1229
1230     prop->name = g_strdup(name);
1231     prop->type = g_strdup(type);
1232
1233     prop->get = get;
1234     prop->set = set;
1235     prop->release = release;
1236     prop->opaque = opaque;
1237
1238     g_hash_table_insert(obj->properties, prop->name, prop);
1239     return prop;
1240 }
1241
1242 ObjectProperty *
1243 object_property_add(Object *obj, const char *name, const char *type,
1244                     ObjectPropertyAccessor *get,
1245                     ObjectPropertyAccessor *set,
1246                     ObjectPropertyRelease *release,
1247                     void *opaque)
1248 {
1249     return object_property_try_add(obj, name, type, get, set, release,
1250                                    opaque, &error_abort);
1251 }
1252
1253 ObjectProperty *
1254 object_class_property_add(ObjectClass *klass,
1255                           const char *name,
1256                           const char *type,
1257                           ObjectPropertyAccessor *get,
1258                           ObjectPropertyAccessor *set,
1259                           ObjectPropertyRelease *release,
1260                           void *opaque)
1261 {
1262     ObjectProperty *prop;
1263
1264     assert(!object_class_property_find(klass, name));
1265
1266     prop = g_malloc0(sizeof(*prop));
1267
1268     prop->name = g_strdup(name);
1269     prop->type = g_strdup(type);
1270
1271     prop->get = get;
1272     prop->set = set;
1273     prop->release = release;
1274     prop->opaque = opaque;
1275
1276     g_hash_table_insert(klass->properties, prop->name, prop);
1277
1278     return prop;
1279 }
1280
1281 ObjectProperty *object_property_find(Object *obj, const char *name)
1282 {
1283     ObjectProperty *prop;
1284     ObjectClass *klass = object_get_class(obj);
1285
1286     prop = object_class_property_find(klass, name);
1287     if (prop) {
1288         return prop;
1289     }
1290
1291     return g_hash_table_lookup(obj->properties, name);
1292 }
1293
1294 ObjectProperty *object_property_find_err(Object *obj, const char *name,
1295                                          Error **errp)
1296 {
1297     ObjectProperty *prop = object_property_find(obj, name);
1298     if (!prop) {
1299         error_setg(errp, "Property '%s.%s' not found",
1300                    object_get_typename(obj), name);
1301     }
1302     return prop;
1303 }
1304
1305 void object_property_iter_init(ObjectPropertyIterator *iter,
1306                                Object *obj)
1307 {
1308     g_hash_table_iter_init(&iter->iter, obj->properties);
1309     iter->nextclass = object_get_class(obj);
1310 }
1311
1312 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1313 {
1314     gpointer key, val;
1315     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1316         if (!iter->nextclass) {
1317             return NULL;
1318         }
1319         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1320         iter->nextclass = object_class_get_parent(iter->nextclass);
1321     }
1322     return val;
1323 }
1324
1325 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1326                                      ObjectClass *klass)
1327 {
1328     g_hash_table_iter_init(&iter->iter, klass->properties);
1329     iter->nextclass = object_class_get_parent(klass);
1330 }
1331
1332 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name)
1333 {
1334     ObjectClass *parent_klass;
1335
1336     parent_klass = object_class_get_parent(klass);
1337     if (parent_klass) {
1338         ObjectProperty *prop =
1339             object_class_property_find(parent_klass, name);
1340         if (prop) {
1341             return prop;
1342         }
1343     }
1344
1345     return g_hash_table_lookup(klass->properties, name);
1346 }
1347
1348 ObjectProperty *object_class_property_find_err(ObjectClass *klass,
1349                                                const char *name,
1350                                                Error **errp)
1351 {
1352     ObjectProperty *prop = object_class_property_find(klass, name);
1353     if (!prop) {
1354         error_setg(errp, "Property '.%s' not found", name);
1355     }
1356     return prop;
1357 }
1358
1359
1360 void object_property_del(Object *obj, const char *name)
1361 {
1362     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1363
1364     if (prop->release) {
1365         prop->release(obj, name, prop->opaque);
1366     }
1367     g_hash_table_remove(obj->properties, name);
1368 }
1369
1370 bool object_property_get(Object *obj, const char *name, Visitor *v,
1371                          Error **errp)
1372 {
1373     Error *err = NULL;
1374     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1375
1376     if (prop == NULL) {
1377         return false;
1378     }
1379
1380     if (!prop->get) {
1381         error_setg(errp, QERR_PERMISSION_DENIED);
1382         return false;
1383     }
1384     prop->get(obj, v, name, prop->opaque, &err);
1385     error_propagate(errp, err);
1386     return !err;
1387 }
1388
1389 bool object_property_set(Object *obj, const char *name, Visitor *v,
1390                          Error **errp)
1391 {
1392     ERRP_GUARD();
1393     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1394
1395     if (prop == NULL) {
1396         return false;
1397     }
1398
1399     if (!prop->set) {
1400         error_setg(errp, QERR_PERMISSION_DENIED);
1401         return false;
1402     }
1403     prop->set(obj, v, name, prop->opaque, errp);
1404     return !*errp;
1405 }
1406
1407 bool object_property_set_str(Object *obj, const char *name,
1408                              const char *value, Error **errp)
1409 {
1410     QString *qstr = qstring_from_str(value);
1411     bool ok = object_property_set_qobject(obj, name, QOBJECT(qstr), errp);
1412
1413     qobject_unref(qstr);
1414     return ok;
1415 }
1416
1417 char *object_property_get_str(Object *obj, const char *name,
1418                               Error **errp)
1419 {
1420     QObject *ret = object_property_get_qobject(obj, name, errp);
1421     QString *qstring;
1422     char *retval;
1423
1424     if (!ret) {
1425         return NULL;
1426     }
1427     qstring = qobject_to(QString, ret);
1428     if (!qstring) {
1429         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1430         retval = NULL;
1431     } else {
1432         retval = g_strdup(qstring_get_str(qstring));
1433     }
1434
1435     qobject_unref(ret);
1436     return retval;
1437 }
1438
1439 bool object_property_set_link(Object *obj, const char *name,
1440                               Object *value, Error **errp)
1441 {
1442     g_autofree char *path = NULL;
1443
1444     if (value) {
1445         path = object_get_canonical_path(value);
1446     }
1447     return object_property_set_str(obj, name, path ?: "", errp);
1448 }
1449
1450 Object *object_property_get_link(Object *obj, const char *name,
1451                                  Error **errp)
1452 {
1453     char *str = object_property_get_str(obj, name, errp);
1454     Object *target = NULL;
1455
1456     if (str && *str) {
1457         target = object_resolve_path(str, NULL);
1458         if (!target) {
1459             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1460                       "Device '%s' not found", str);
1461         }
1462     }
1463
1464     g_free(str);
1465     return target;
1466 }
1467
1468 bool object_property_set_bool(Object *obj, const char *name,
1469                               bool value, Error **errp)
1470 {
1471     QBool *qbool = qbool_from_bool(value);
1472     bool ok = object_property_set_qobject(obj, name, QOBJECT(qbool), errp);
1473
1474     qobject_unref(qbool);
1475     return ok;
1476 }
1477
1478 bool object_property_get_bool(Object *obj, const char *name,
1479                               Error **errp)
1480 {
1481     QObject *ret = object_property_get_qobject(obj, name, errp);
1482     QBool *qbool;
1483     bool retval;
1484
1485     if (!ret) {
1486         return false;
1487     }
1488     qbool = qobject_to(QBool, ret);
1489     if (!qbool) {
1490         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1491         retval = false;
1492     } else {
1493         retval = qbool_get_bool(qbool);
1494     }
1495
1496     qobject_unref(ret);
1497     return retval;
1498 }
1499
1500 bool object_property_set_int(Object *obj, const char *name,
1501                              int64_t value, Error **errp)
1502 {
1503     QNum *qnum = qnum_from_int(value);
1504     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1505
1506     qobject_unref(qnum);
1507     return ok;
1508 }
1509
1510 int64_t object_property_get_int(Object *obj, const char *name,
1511                                 Error **errp)
1512 {
1513     QObject *ret = object_property_get_qobject(obj, name, errp);
1514     QNum *qnum;
1515     int64_t retval;
1516
1517     if (!ret) {
1518         return -1;
1519     }
1520
1521     qnum = qobject_to(QNum, ret);
1522     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1523         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1524         retval = -1;
1525     }
1526
1527     qobject_unref(ret);
1528     return retval;
1529 }
1530
1531 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
1532 {
1533     Visitor *v = qobject_input_visitor_new(prop->defval);
1534
1535     assert(prop->set != NULL);
1536     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
1537
1538     visit_free(v);
1539 }
1540
1541 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
1542 {
1543     assert(!prop->defval);
1544     assert(!prop->init);
1545
1546     prop->defval = defval;
1547     prop->init = object_property_init_defval;
1548 }
1549
1550 void object_property_set_default_bool(ObjectProperty *prop, bool value)
1551 {
1552     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
1553 }
1554
1555 void object_property_set_default_str(ObjectProperty *prop, const char *value)
1556 {
1557     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
1558 }
1559
1560 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
1561 {
1562     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
1563 }
1564
1565 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
1566 {
1567     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
1568 }
1569
1570 bool object_property_set_uint(Object *obj, const char *name,
1571                               uint64_t value, Error **errp)
1572 {
1573     QNum *qnum = qnum_from_uint(value);
1574     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1575
1576     qobject_unref(qnum);
1577     return ok;
1578 }
1579
1580 uint64_t object_property_get_uint(Object *obj, const char *name,
1581                                   Error **errp)
1582 {
1583     QObject *ret = object_property_get_qobject(obj, name, errp);
1584     QNum *qnum;
1585     uint64_t retval;
1586
1587     if (!ret) {
1588         return 0;
1589     }
1590     qnum = qobject_to(QNum, ret);
1591     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1592         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1593         retval = 0;
1594     }
1595
1596     qobject_unref(ret);
1597     return retval;
1598 }
1599
1600 typedef struct EnumProperty {
1601     const QEnumLookup *lookup;
1602     int (*get)(Object *, Error **);
1603     void (*set)(Object *, int, Error **);
1604 } EnumProperty;
1605
1606 int object_property_get_enum(Object *obj, const char *name,
1607                              const char *typename, Error **errp)
1608 {
1609     char *str;
1610     int ret;
1611     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1612     EnumProperty *enumprop;
1613
1614     if (prop == NULL) {
1615         return -1;
1616     }
1617
1618     if (!g_str_equal(prop->type, typename)) {
1619         error_setg(errp, "Property %s on %s is not '%s' enum type",
1620                    name, object_class_get_name(
1621                        object_get_class(obj)), typename);
1622         return -1;
1623     }
1624
1625     enumprop = prop->opaque;
1626
1627     str = object_property_get_str(obj, name, errp);
1628     if (!str) {
1629         return -1;
1630     }
1631
1632     ret = qapi_enum_parse(enumprop->lookup, str, -1, errp);
1633     g_free(str);
1634
1635     return ret;
1636 }
1637
1638 bool object_property_parse(Object *obj, const char *name,
1639                            const char *string, Error **errp)
1640 {
1641     Visitor *v = string_input_visitor_new(string);
1642     bool ok = object_property_set(obj, name, v, errp);
1643
1644     visit_free(v);
1645     return ok;
1646 }
1647
1648 char *object_property_print(Object *obj, const char *name, bool human,
1649                             Error **errp)
1650 {
1651     Visitor *v;
1652     char *string = NULL;
1653
1654     v = string_output_visitor_new(human, &string);
1655     if (!object_property_get(obj, name, v, errp)) {
1656         goto out;
1657     }
1658
1659     visit_complete(v, &string);
1660
1661 out:
1662     visit_free(v);
1663     return string;
1664 }
1665
1666 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1667 {
1668     ObjectProperty *prop = object_property_find_err(obj, name, errp);
1669     if (prop == NULL) {
1670         return NULL;
1671     }
1672
1673     return prop->type;
1674 }
1675
1676 Object *object_get_root(void)
1677 {
1678     static Object *root;
1679
1680     if (!root) {
1681         root = object_new("container");
1682     }
1683
1684     return root;
1685 }
1686
1687 Object *object_get_objects_root(void)
1688 {
1689     return container_get(object_get_root(), "/objects");
1690 }
1691
1692 Object *object_get_internal_root(void)
1693 {
1694     static Object *internal_root;
1695
1696     if (!internal_root) {
1697         internal_root = object_new("container");
1698     }
1699
1700     return internal_root;
1701 }
1702
1703 static void object_get_child_property(Object *obj, Visitor *v,
1704                                       const char *name, void *opaque,
1705                                       Error **errp)
1706 {
1707     Object *child = opaque;
1708     char *path;
1709
1710     path = object_get_canonical_path(child);
1711     visit_type_str(v, name, &path, errp);
1712     g_free(path);
1713 }
1714
1715 static Object *object_resolve_child_property(Object *parent, void *opaque,
1716                                              const char *part)
1717 {
1718     return opaque;
1719 }
1720
1721 static void object_finalize_child_property(Object *obj, const char *name,
1722                                            void *opaque)
1723 {
1724     Object *child = opaque;
1725
1726     if (child->class->unparent) {
1727         (child->class->unparent)(child);
1728     }
1729     child->parent = NULL;
1730     object_unref(child);
1731 }
1732
1733 ObjectProperty *
1734 object_property_try_add_child(Object *obj, const char *name,
1735                               Object *child, Error **errp)
1736 {
1737     g_autofree char *type = NULL;
1738     ObjectProperty *op;
1739
1740     assert(!child->parent);
1741
1742     type = g_strdup_printf("child<%s>", object_get_typename(child));
1743
1744     op = object_property_try_add(obj, name, type, object_get_child_property,
1745                                  NULL, object_finalize_child_property,
1746                                  child, errp);
1747     if (!op) {
1748         return NULL;
1749     }
1750     op->resolve = object_resolve_child_property;
1751     object_ref(child);
1752     child->parent = obj;
1753     return op;
1754 }
1755
1756 ObjectProperty *
1757 object_property_add_child(Object *obj, const char *name,
1758                           Object *child)
1759 {
1760     return object_property_try_add_child(obj, name, child, &error_abort);
1761 }
1762
1763 void object_property_allow_set_link(const Object *obj, const char *name,
1764                                     Object *val, Error **errp)
1765 {
1766     /* Allow the link to be set, always */
1767 }
1768
1769 typedef struct {
1770     union {
1771         Object **targetp;
1772         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
1773         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
1774     };
1775     void (*check)(const Object *, const char *, Object *, Error **);
1776     ObjectPropertyLinkFlags flags;
1777 } LinkProperty;
1778
1779 static Object **
1780 object_link_get_targetp(Object *obj, LinkProperty *lprop)
1781 {
1782     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
1783         return &lprop->target;
1784     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
1785         return (void *)obj + lprop->offset;
1786     } else {
1787         return lprop->targetp;
1788     }
1789 }
1790
1791 static void object_get_link_property(Object *obj, Visitor *v,
1792                                      const char *name, void *opaque,
1793                                      Error **errp)
1794 {
1795     LinkProperty *lprop = opaque;
1796     Object **targetp = object_link_get_targetp(obj, lprop);
1797     char *path;
1798
1799     if (*targetp) {
1800         path = object_get_canonical_path(*targetp);
1801         visit_type_str(v, name, &path, errp);
1802         g_free(path);
1803     } else {
1804         path = (char *)"";
1805         visit_type_str(v, name, &path, errp);
1806     }
1807 }
1808
1809 /*
1810  * object_resolve_link:
1811  *
1812  * Lookup an object and ensure its type matches the link property type.  This
1813  * is similar to object_resolve_path() except type verification against the
1814  * link property is performed.
1815  *
1816  * Returns: The matched object or NULL on path lookup failures.
1817  */
1818 static Object *object_resolve_link(Object *obj, const char *name,
1819                                    const char *path, Error **errp)
1820 {
1821     const char *type;
1822     char *target_type;
1823     bool ambiguous = false;
1824     Object *target;
1825
1826     /* Go from link<FOO> to FOO.  */
1827     type = object_property_get_type(obj, name, NULL);
1828     target_type = g_strndup(&type[5], strlen(type) - 6);
1829     target = object_resolve_path_type(path, target_type, &ambiguous);
1830
1831     if (ambiguous) {
1832         error_setg(errp, "Path '%s' does not uniquely identify an object",
1833                    path);
1834     } else if (!target) {
1835         target = object_resolve_path(path, &ambiguous);
1836         if (target || ambiguous) {
1837             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1838         } else {
1839             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1840                       "Device '%s' not found", path);
1841         }
1842         target = NULL;
1843     }
1844     g_free(target_type);
1845
1846     return target;
1847 }
1848
1849 static void object_set_link_property(Object *obj, Visitor *v,
1850                                      const char *name, void *opaque,
1851                                      Error **errp)
1852 {
1853     Error *local_err = NULL;
1854     LinkProperty *prop = opaque;
1855     Object **targetp = object_link_get_targetp(obj, prop);
1856     Object *old_target = *targetp;
1857     Object *new_target;
1858     char *path = NULL;
1859
1860     if (!visit_type_str(v, name, &path, errp)) {
1861         return;
1862     }
1863
1864     if (*path) {
1865         new_target = object_resolve_link(obj, name, path, errp);
1866         if (!new_target) {
1867             g_free(path);
1868             return;
1869         }
1870     } else {
1871         new_target = NULL;
1872     }
1873
1874     g_free(path);
1875
1876     prop->check(obj, name, new_target, &local_err);
1877     if (local_err) {
1878         error_propagate(errp, local_err);
1879         return;
1880     }
1881
1882     *targetp = new_target;
1883     if (prop->flags & OBJ_PROP_LINK_STRONG) {
1884         object_ref(new_target);
1885         object_unref(old_target);
1886     }
1887 }
1888
1889 static Object *object_resolve_link_property(Object *parent, void *opaque,
1890                                             const char *part)
1891 {
1892     LinkProperty *lprop = opaque;
1893
1894     return *object_link_get_targetp(parent, lprop);
1895 }
1896
1897 static void object_release_link_property(Object *obj, const char *name,
1898                                          void *opaque)
1899 {
1900     LinkProperty *prop = opaque;
1901     Object **targetp = object_link_get_targetp(obj, prop);
1902
1903     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
1904         object_unref(*targetp);
1905     }
1906     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
1907         g_free(prop);
1908     }
1909 }
1910
1911 static ObjectProperty *
1912 object_add_link_prop(Object *obj, const char *name,
1913                      const char *type, void *ptr,
1914                      void (*check)(const Object *, const char *,
1915                                    Object *, Error **),
1916                      ObjectPropertyLinkFlags flags)
1917 {
1918     LinkProperty *prop = g_malloc(sizeof(*prop));
1919     g_autofree char *full_type = NULL;
1920     ObjectProperty *op;
1921
1922     if (flags & OBJ_PROP_LINK_DIRECT) {
1923         prop->target = ptr;
1924     } else {
1925         prop->targetp = ptr;
1926     }
1927     prop->check = check;
1928     prop->flags = flags;
1929
1930     full_type = g_strdup_printf("link<%s>", type);
1931
1932     op = object_property_add(obj, name, full_type,
1933                              object_get_link_property,
1934                              check ? object_set_link_property : NULL,
1935                              object_release_link_property,
1936                              prop);
1937     op->resolve = object_resolve_link_property;
1938     return op;
1939 }
1940
1941 ObjectProperty *
1942 object_property_add_link(Object *obj, const char *name,
1943                          const char *type, Object **targetp,
1944                          void (*check)(const Object *, const char *,
1945                                        Object *, Error **),
1946                          ObjectPropertyLinkFlags flags)
1947 {
1948     return object_add_link_prop(obj, name, type, targetp, check, flags);
1949 }
1950
1951 ObjectProperty *
1952 object_class_property_add_link(ObjectClass *oc,
1953     const char *name,
1954     const char *type, ptrdiff_t offset,
1955     void (*check)(const Object *obj, const char *name,
1956                   Object *val, Error **errp),
1957     ObjectPropertyLinkFlags flags)
1958 {
1959     LinkProperty *prop = g_new0(LinkProperty, 1);
1960     char *full_type;
1961     ObjectProperty *op;
1962
1963     prop->offset = offset;
1964     prop->check = check;
1965     prop->flags = flags | OBJ_PROP_LINK_CLASS;
1966
1967     full_type = g_strdup_printf("link<%s>", type);
1968
1969     op = object_class_property_add(oc, name, full_type,
1970                                    object_get_link_property,
1971                                    check ? object_set_link_property : NULL,
1972                                    object_release_link_property,
1973                                    prop);
1974
1975     op->resolve = object_resolve_link_property;
1976
1977     g_free(full_type);
1978     return op;
1979 }
1980
1981 ObjectProperty *
1982 object_property_add_const_link(Object *obj, const char *name,
1983                                Object *target)
1984 {
1985     return object_add_link_prop(obj, name,
1986                                 object_get_typename(target), target,
1987                                 NULL, OBJ_PROP_LINK_DIRECT);
1988 }
1989
1990 const char *object_get_canonical_path_component(const Object *obj)
1991 {
1992     ObjectProperty *prop = NULL;
1993     GHashTableIter iter;
1994
1995     if (obj->parent == NULL) {
1996         return NULL;
1997     }
1998
1999     g_hash_table_iter_init(&iter, obj->parent->properties);
2000     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2001         if (!object_property_is_child(prop)) {
2002             continue;
2003         }
2004
2005         if (prop->opaque == obj) {
2006             return prop->name;
2007         }
2008     }
2009
2010     /* obj had a parent but was not a child, should never happen */
2011     g_assert_not_reached();
2012     return NULL;
2013 }
2014
2015 char *object_get_canonical_path(const Object *obj)
2016 {
2017     Object *root = object_get_root();
2018     char *newpath, *path = NULL;
2019
2020     if (obj == root) {
2021         return g_strdup("/");
2022     }
2023
2024     do {
2025         const char *component = object_get_canonical_path_component(obj);
2026
2027         if (!component) {
2028             /* A canonical path must be complete, so discard what was
2029              * collected so far.
2030              */
2031             g_free(path);
2032             return NULL;
2033         }
2034
2035         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
2036         g_free(path);
2037         path = newpath;
2038         obj = obj->parent;
2039     } while (obj != root);
2040
2041     return path;
2042 }
2043
2044 Object *object_resolve_path_component(Object *parent, const char *part)
2045 {
2046     ObjectProperty *prop = object_property_find(parent, part);
2047     if (prop == NULL) {
2048         return NULL;
2049     }
2050
2051     if (prop->resolve) {
2052         return prop->resolve(parent, prop->opaque, part);
2053     } else {
2054         return NULL;
2055     }
2056 }
2057
2058 static Object *object_resolve_abs_path(Object *parent,
2059                                           char **parts,
2060                                           const char *typename)
2061 {
2062     Object *child;
2063
2064     if (*parts == NULL) {
2065         return object_dynamic_cast(parent, typename);
2066     }
2067
2068     if (strcmp(*parts, "") == 0) {
2069         return object_resolve_abs_path(parent, parts + 1, typename);
2070     }
2071
2072     child = object_resolve_path_component(parent, *parts);
2073     if (!child) {
2074         return NULL;
2075     }
2076
2077     return object_resolve_abs_path(child, parts + 1, typename);
2078 }
2079
2080 static Object *object_resolve_partial_path(Object *parent,
2081                                            char **parts,
2082                                            const char *typename,
2083                                            bool *ambiguous)
2084 {
2085     Object *obj;
2086     GHashTableIter iter;
2087     ObjectProperty *prop;
2088
2089     obj = object_resolve_abs_path(parent, parts, typename);
2090
2091     g_hash_table_iter_init(&iter, parent->properties);
2092     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2093         Object *found;
2094
2095         if (!object_property_is_child(prop)) {
2096             continue;
2097         }
2098
2099         found = object_resolve_partial_path(prop->opaque, parts,
2100                                             typename, ambiguous);
2101         if (found) {
2102             if (obj) {
2103                 *ambiguous = true;
2104                 return NULL;
2105             }
2106             obj = found;
2107         }
2108
2109         if (*ambiguous) {
2110             return NULL;
2111         }
2112     }
2113
2114     return obj;
2115 }
2116
2117 Object *object_resolve_path_type(const char *path, const char *typename,
2118                                  bool *ambiguousp)
2119 {
2120     Object *obj;
2121     char **parts;
2122
2123     parts = g_strsplit(path, "/", 0);
2124     assert(parts);
2125
2126     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
2127         bool ambiguous = false;
2128         obj = object_resolve_partial_path(object_get_root(), parts,
2129                                           typename, &ambiguous);
2130         if (ambiguousp) {
2131             *ambiguousp = ambiguous;
2132         }
2133     } else {
2134         obj = object_resolve_abs_path(object_get_root(), parts + 1, typename);
2135     }
2136
2137     g_strfreev(parts);
2138
2139     return obj;
2140 }
2141
2142 Object *object_resolve_path(const char *path, bool *ambiguous)
2143 {
2144     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
2145 }
2146
2147 Object *object_resolve_path_at(Object *parent, const char *path)
2148 {
2149     g_auto(GStrv) parts = g_strsplit(path, "/", 0);
2150
2151     if (*path == '/') {
2152         return object_resolve_abs_path(object_get_root(), parts + 1,
2153                                        TYPE_OBJECT);
2154     }
2155     return object_resolve_abs_path(parent, parts, TYPE_OBJECT);
2156 }
2157
2158 typedef struct StringProperty
2159 {
2160     char *(*get)(Object *, Error **);
2161     void (*set)(Object *, const char *, Error **);
2162 } StringProperty;
2163
2164 static void property_get_str(Object *obj, Visitor *v, const char *name,
2165                              void *opaque, Error **errp)
2166 {
2167     StringProperty *prop = opaque;
2168     char *value;
2169     Error *err = NULL;
2170
2171     value = prop->get(obj, &err);
2172     if (err) {
2173         error_propagate(errp, err);
2174         return;
2175     }
2176
2177     visit_type_str(v, name, &value, errp);
2178     g_free(value);
2179 }
2180
2181 static void property_set_str(Object *obj, Visitor *v, const char *name,
2182                              void *opaque, Error **errp)
2183 {
2184     StringProperty *prop = opaque;
2185     char *value;
2186
2187     if (!visit_type_str(v, name, &value, errp)) {
2188         return;
2189     }
2190
2191     prop->set(obj, value, errp);
2192     g_free(value);
2193 }
2194
2195 static void property_release_data(Object *obj, const char *name,
2196                                   void *opaque)
2197 {
2198     g_free(opaque);
2199 }
2200
2201 ObjectProperty *
2202 object_property_add_str(Object *obj, const char *name,
2203                         char *(*get)(Object *, Error **),
2204                         void (*set)(Object *, const char *, Error **))
2205 {
2206     StringProperty *prop = g_malloc0(sizeof(*prop));
2207
2208     prop->get = get;
2209     prop->set = set;
2210
2211     return object_property_add(obj, name, "string",
2212                                get ? property_get_str : NULL,
2213                                set ? property_set_str : NULL,
2214                                property_release_data,
2215                                prop);
2216 }
2217
2218 ObjectProperty *
2219 object_class_property_add_str(ObjectClass *klass, const char *name,
2220                                    char *(*get)(Object *, Error **),
2221                                    void (*set)(Object *, const char *,
2222                                                Error **))
2223 {
2224     StringProperty *prop = g_malloc0(sizeof(*prop));
2225
2226     prop->get = get;
2227     prop->set = set;
2228
2229     return object_class_property_add(klass, name, "string",
2230                                      get ? property_get_str : NULL,
2231                                      set ? property_set_str : NULL,
2232                                      NULL,
2233                                      prop);
2234 }
2235
2236 typedef struct BoolProperty
2237 {
2238     bool (*get)(Object *, Error **);
2239     void (*set)(Object *, bool, Error **);
2240 } BoolProperty;
2241
2242 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2243                               void *opaque, Error **errp)
2244 {
2245     BoolProperty *prop = opaque;
2246     bool value;
2247     Error *err = NULL;
2248
2249     value = prop->get(obj, &err);
2250     if (err) {
2251         error_propagate(errp, err);
2252         return;
2253     }
2254
2255     visit_type_bool(v, name, &value, errp);
2256 }
2257
2258 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2259                               void *opaque, Error **errp)
2260 {
2261     BoolProperty *prop = opaque;
2262     bool value;
2263
2264     if (!visit_type_bool(v, name, &value, errp)) {
2265         return;
2266     }
2267
2268     prop->set(obj, value, errp);
2269 }
2270
2271 ObjectProperty *
2272 object_property_add_bool(Object *obj, const char *name,
2273                          bool (*get)(Object *, Error **),
2274                          void (*set)(Object *, bool, Error **))
2275 {
2276     BoolProperty *prop = g_malloc0(sizeof(*prop));
2277
2278     prop->get = get;
2279     prop->set = set;
2280
2281     return object_property_add(obj, name, "bool",
2282                                get ? property_get_bool : NULL,
2283                                set ? property_set_bool : NULL,
2284                                property_release_data,
2285                                prop);
2286 }
2287
2288 ObjectProperty *
2289 object_class_property_add_bool(ObjectClass *klass, const char *name,
2290                                     bool (*get)(Object *, Error **),
2291                                     void (*set)(Object *, bool, Error **))
2292 {
2293     BoolProperty *prop = g_malloc0(sizeof(*prop));
2294
2295     prop->get = get;
2296     prop->set = set;
2297
2298     return object_class_property_add(klass, name, "bool",
2299                                      get ? property_get_bool : NULL,
2300                                      set ? property_set_bool : NULL,
2301                                      NULL,
2302                                      prop);
2303 }
2304
2305 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2306                               void *opaque, Error **errp)
2307 {
2308     EnumProperty *prop = opaque;
2309     int value;
2310     Error *err = NULL;
2311
2312     value = prop->get(obj, &err);
2313     if (err) {
2314         error_propagate(errp, err);
2315         return;
2316     }
2317
2318     visit_type_enum(v, name, &value, prop->lookup, errp);
2319 }
2320
2321 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2322                               void *opaque, Error **errp)
2323 {
2324     EnumProperty *prop = opaque;
2325     int value;
2326
2327     if (!visit_type_enum(v, name, &value, prop->lookup, errp)) {
2328         return;
2329     }
2330     prop->set(obj, value, errp);
2331 }
2332
2333 ObjectProperty *
2334 object_property_add_enum(Object *obj, const char *name,
2335                          const char *typename,
2336                          const QEnumLookup *lookup,
2337                          int (*get)(Object *, Error **),
2338                          void (*set)(Object *, int, Error **))
2339 {
2340     EnumProperty *prop = g_malloc(sizeof(*prop));
2341
2342     prop->lookup = lookup;
2343     prop->get = get;
2344     prop->set = set;
2345
2346     return object_property_add(obj, name, typename,
2347                                get ? property_get_enum : NULL,
2348                                set ? property_set_enum : NULL,
2349                                property_release_data,
2350                                prop);
2351 }
2352
2353 ObjectProperty *
2354 object_class_property_add_enum(ObjectClass *klass, const char *name,
2355                                     const char *typename,
2356                                     const QEnumLookup *lookup,
2357                                     int (*get)(Object *, Error **),
2358                                     void (*set)(Object *, int, Error **))
2359 {
2360     EnumProperty *prop = g_malloc(sizeof(*prop));
2361
2362     prop->lookup = lookup;
2363     prop->get = get;
2364     prop->set = set;
2365
2366     return object_class_property_add(klass, name, typename,
2367                                      get ? property_get_enum : NULL,
2368                                      set ? property_set_enum : NULL,
2369                                      NULL,
2370                                      prop);
2371 }
2372
2373 typedef struct TMProperty {
2374     void (*get)(Object *, struct tm *, Error **);
2375 } TMProperty;
2376
2377 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2378                             void *opaque, Error **errp)
2379 {
2380     TMProperty *prop = opaque;
2381     Error *err = NULL;
2382     struct tm value;
2383
2384     prop->get(obj, &value, &err);
2385     if (err) {
2386         error_propagate(errp, err);
2387         return;
2388     }
2389
2390     if (!visit_start_struct(v, name, NULL, 0, errp)) {
2391         return;
2392     }
2393     if (!visit_type_int32(v, "tm_year", &value.tm_year, errp)) {
2394         goto out_end;
2395     }
2396     if (!visit_type_int32(v, "tm_mon", &value.tm_mon, errp)) {
2397         goto out_end;
2398     }
2399     if (!visit_type_int32(v, "tm_mday", &value.tm_mday, errp)) {
2400         goto out_end;
2401     }
2402     if (!visit_type_int32(v, "tm_hour", &value.tm_hour, errp)) {
2403         goto out_end;
2404     }
2405     if (!visit_type_int32(v, "tm_min", &value.tm_min, errp)) {
2406         goto out_end;
2407     }
2408     if (!visit_type_int32(v, "tm_sec", &value.tm_sec, errp)) {
2409         goto out_end;
2410     }
2411     visit_check_struct(v, errp);
2412 out_end:
2413     visit_end_struct(v, NULL);
2414 }
2415
2416 ObjectProperty *
2417 object_property_add_tm(Object *obj, const char *name,
2418                        void (*get)(Object *, struct tm *, Error **))
2419 {
2420     TMProperty *prop = g_malloc0(sizeof(*prop));
2421
2422     prop->get = get;
2423
2424     return object_property_add(obj, name, "struct tm",
2425                                get ? property_get_tm : NULL, NULL,
2426                                property_release_data,
2427                                prop);
2428 }
2429
2430 ObjectProperty *
2431 object_class_property_add_tm(ObjectClass *klass, const char *name,
2432                              void (*get)(Object *, struct tm *, Error **))
2433 {
2434     TMProperty *prop = g_malloc0(sizeof(*prop));
2435
2436     prop->get = get;
2437
2438     return object_class_property_add(klass, name, "struct tm",
2439                                      get ? property_get_tm : NULL,
2440                                      NULL, NULL, prop);
2441 }
2442
2443 static char *object_get_type(Object *obj, Error **errp)
2444 {
2445     return g_strdup(object_get_typename(obj));
2446 }
2447
2448 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2449                                    void *opaque, Error **errp)
2450 {
2451     uint8_t value = *(uint8_t *)opaque;
2452     visit_type_uint8(v, name, &value, errp);
2453 }
2454
2455 static void property_set_uint8_ptr(Object *obj, Visitor *v, const char *name,
2456                                    void *opaque, Error **errp)
2457 {
2458     uint8_t *field = opaque;
2459     uint8_t value;
2460
2461     if (!visit_type_uint8(v, name, &value, errp)) {
2462         return;
2463     }
2464
2465     *field = value;
2466 }
2467
2468 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2469                                     void *opaque, Error **errp)
2470 {
2471     uint16_t value = *(uint16_t *)opaque;
2472     visit_type_uint16(v, name, &value, errp);
2473 }
2474
2475 static void property_set_uint16_ptr(Object *obj, Visitor *v, const char *name,
2476                                     void *opaque, Error **errp)
2477 {
2478     uint16_t *field = opaque;
2479     uint16_t value;
2480
2481     if (!visit_type_uint16(v, name, &value, errp)) {
2482         return;
2483     }
2484
2485     *field = value;
2486 }
2487
2488 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2489                                     void *opaque, Error **errp)
2490 {
2491     uint32_t value = *(uint32_t *)opaque;
2492     visit_type_uint32(v, name, &value, errp);
2493 }
2494
2495 static void property_set_uint32_ptr(Object *obj, Visitor *v, const char *name,
2496                                     void *opaque, Error **errp)
2497 {
2498     uint32_t *field = opaque;
2499     uint32_t value;
2500
2501     if (!visit_type_uint32(v, name, &value, errp)) {
2502         return;
2503     }
2504
2505     *field = value;
2506 }
2507
2508 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2509                                     void *opaque, Error **errp)
2510 {
2511     uint64_t value = *(uint64_t *)opaque;
2512     visit_type_uint64(v, name, &value, errp);
2513 }
2514
2515 static void property_set_uint64_ptr(Object *obj, Visitor *v, const char *name,
2516                                     void *opaque, Error **errp)
2517 {
2518     uint64_t *field = opaque;
2519     uint64_t value;
2520
2521     if (!visit_type_uint64(v, name, &value, errp)) {
2522         return;
2523     }
2524
2525     *field = value;
2526 }
2527
2528 ObjectProperty *
2529 object_property_add_uint8_ptr(Object *obj, const char *name,
2530                               const uint8_t *v,
2531                               ObjectPropertyFlags flags)
2532 {
2533     ObjectPropertyAccessor *getter = NULL;
2534     ObjectPropertyAccessor *setter = NULL;
2535
2536     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2537         getter = property_get_uint8_ptr;
2538     }
2539
2540     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2541         setter = property_set_uint8_ptr;
2542     }
2543
2544     return object_property_add(obj, name, "uint8",
2545                                getter, setter, NULL, (void *)v);
2546 }
2547
2548 ObjectProperty *
2549 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2550                                     const uint8_t *v,
2551                                     ObjectPropertyFlags flags)
2552 {
2553     ObjectPropertyAccessor *getter = NULL;
2554     ObjectPropertyAccessor *setter = NULL;
2555
2556     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2557         getter = property_get_uint8_ptr;
2558     }
2559
2560     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2561         setter = property_set_uint8_ptr;
2562     }
2563
2564     return object_class_property_add(klass, name, "uint8",
2565                                      getter, setter, NULL, (void *)v);
2566 }
2567
2568 ObjectProperty *
2569 object_property_add_uint16_ptr(Object *obj, const char *name,
2570                                const uint16_t *v,
2571                                ObjectPropertyFlags flags)
2572 {
2573     ObjectPropertyAccessor *getter = NULL;
2574     ObjectPropertyAccessor *setter = NULL;
2575
2576     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2577         getter = property_get_uint16_ptr;
2578     }
2579
2580     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2581         setter = property_set_uint16_ptr;
2582     }
2583
2584     return object_property_add(obj, name, "uint16",
2585                                getter, setter, NULL, (void *)v);
2586 }
2587
2588 ObjectProperty *
2589 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2590                                      const uint16_t *v,
2591                                      ObjectPropertyFlags flags)
2592 {
2593     ObjectPropertyAccessor *getter = NULL;
2594     ObjectPropertyAccessor *setter = NULL;
2595
2596     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2597         getter = property_get_uint16_ptr;
2598     }
2599
2600     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2601         setter = property_set_uint16_ptr;
2602     }
2603
2604     return object_class_property_add(klass, name, "uint16",
2605                                      getter, setter, NULL, (void *)v);
2606 }
2607
2608 ObjectProperty *
2609 object_property_add_uint32_ptr(Object *obj, const char *name,
2610                                const uint32_t *v,
2611                                ObjectPropertyFlags flags)
2612 {
2613     ObjectPropertyAccessor *getter = NULL;
2614     ObjectPropertyAccessor *setter = NULL;
2615
2616     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2617         getter = property_get_uint32_ptr;
2618     }
2619
2620     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2621         setter = property_set_uint32_ptr;
2622     }
2623
2624     return object_property_add(obj, name, "uint32",
2625                                getter, setter, NULL, (void *)v);
2626 }
2627
2628 ObjectProperty *
2629 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2630                                      const uint32_t *v,
2631                                      ObjectPropertyFlags flags)
2632 {
2633     ObjectPropertyAccessor *getter = NULL;
2634     ObjectPropertyAccessor *setter = NULL;
2635
2636     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2637         getter = property_get_uint32_ptr;
2638     }
2639
2640     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2641         setter = property_set_uint32_ptr;
2642     }
2643
2644     return object_class_property_add(klass, name, "uint32",
2645                                      getter, setter, NULL, (void *)v);
2646 }
2647
2648 ObjectProperty *
2649 object_property_add_uint64_ptr(Object *obj, const char *name,
2650                                const uint64_t *v,
2651                                ObjectPropertyFlags flags)
2652 {
2653     ObjectPropertyAccessor *getter = NULL;
2654     ObjectPropertyAccessor *setter = NULL;
2655
2656     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2657         getter = property_get_uint64_ptr;
2658     }
2659
2660     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2661         setter = property_set_uint64_ptr;
2662     }
2663
2664     return object_property_add(obj, name, "uint64",
2665                                getter, setter, NULL, (void *)v);
2666 }
2667
2668 ObjectProperty *
2669 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2670                                      const uint64_t *v,
2671                                      ObjectPropertyFlags flags)
2672 {
2673     ObjectPropertyAccessor *getter = NULL;
2674     ObjectPropertyAccessor *setter = NULL;
2675
2676     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2677         getter = property_get_uint64_ptr;
2678     }
2679
2680     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2681         setter = property_set_uint64_ptr;
2682     }
2683
2684     return object_class_property_add(klass, name, "uint64",
2685                                      getter, setter, NULL, (void *)v);
2686 }
2687
2688 typedef struct {
2689     Object *target_obj;
2690     char *target_name;
2691 } AliasProperty;
2692
2693 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2694                                void *opaque, Error **errp)
2695 {
2696     AliasProperty *prop = opaque;
2697     Visitor *alias_v = visitor_forward_field(v, prop->target_name, name);
2698
2699     object_property_get(prop->target_obj, prop->target_name, alias_v, errp);
2700     visit_free(alias_v);
2701 }
2702
2703 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2704                                void *opaque, Error **errp)
2705 {
2706     AliasProperty *prop = opaque;
2707     Visitor *alias_v = visitor_forward_field(v, prop->target_name, name);
2708
2709     object_property_set(prop->target_obj, prop->target_name, alias_v, errp);
2710     visit_free(alias_v);
2711 }
2712
2713 static Object *property_resolve_alias(Object *obj, void *opaque,
2714                                       const char *part)
2715 {
2716     AliasProperty *prop = opaque;
2717
2718     return object_resolve_path_component(prop->target_obj, prop->target_name);
2719 }
2720
2721 static void property_release_alias(Object *obj, const char *name, void *opaque)
2722 {
2723     AliasProperty *prop = opaque;
2724
2725     g_free(prop->target_name);
2726     g_free(prop);
2727 }
2728
2729 ObjectProperty *
2730 object_property_add_alias(Object *obj, const char *name,
2731                           Object *target_obj, const char *target_name)
2732 {
2733     AliasProperty *prop;
2734     ObjectProperty *op;
2735     ObjectProperty *target_prop;
2736     g_autofree char *prop_type = NULL;
2737
2738     target_prop = object_property_find_err(target_obj, target_name,
2739                                            &error_abort);
2740
2741     if (object_property_is_child(target_prop)) {
2742         prop_type = g_strdup_printf("link%s",
2743                                     target_prop->type + strlen("child"));
2744     } else {
2745         prop_type = g_strdup(target_prop->type);
2746     }
2747
2748     prop = g_malloc(sizeof(*prop));
2749     prop->target_obj = target_obj;
2750     prop->target_name = g_strdup(target_name);
2751
2752     op = object_property_add(obj, name, prop_type,
2753                              property_get_alias,
2754                              property_set_alias,
2755                              property_release_alias,
2756                              prop);
2757     op->resolve = property_resolve_alias;
2758     if (target_prop->defval) {
2759         op->defval = qobject_ref(target_prop->defval);
2760     }
2761
2762     object_property_set_description(obj, op->name,
2763                                     target_prop->description);
2764     return op;
2765 }
2766
2767 void object_property_set_description(Object *obj, const char *name,
2768                                      const char *description)
2769 {
2770     ObjectProperty *op;
2771
2772     op = object_property_find_err(obj, name, &error_abort);
2773     g_free(op->description);
2774     op->description = g_strdup(description);
2775 }
2776
2777 void object_class_property_set_description(ObjectClass *klass,
2778                                            const char *name,
2779                                            const char *description)
2780 {
2781     ObjectProperty *op;
2782
2783     op = g_hash_table_lookup(klass->properties, name);
2784     g_free(op->description);
2785     op->description = g_strdup(description);
2786 }
2787
2788 static void object_class_init(ObjectClass *klass, void *data)
2789 {
2790     object_class_property_add_str(klass, "type", object_get_type,
2791                                   NULL);
2792 }
2793
2794 static void register_types(void)
2795 {
2796     static TypeInfo interface_info = {
2797         .name = TYPE_INTERFACE,
2798         .class_size = sizeof(InterfaceClass),
2799         .abstract = true,
2800     };
2801
2802     static TypeInfo object_info = {
2803         .name = TYPE_OBJECT,
2804         .instance_size = sizeof(Object),
2805         .class_init = object_class_init,
2806         .abstract = true,
2807     };
2808
2809     type_interface = type_register_internal(&interface_info);
2810     type_register_internal(&object_info);
2811 }
2812
2813 type_init(register_types)