qemu

object.c (75715B)

---

 /*
  * QEMU Object Model
  *
  * Copyright IBM, Corp. 2011
  *
  * Authors:
  *  Anthony Liguori   <aliguori@us.ibm.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
 #include "qemu/osdep.h"
 #include "hw/qdev-core.h"
 #include "qapi/error.h"
 #include "qom/object.h"
 #include "qom/object_interfaces.h"
 #include "qemu/cutils.h"
 #include "qemu/memalign.h"
 #include "qapi/visitor.h"
 #include "qapi/string-input-visitor.h"
 #include "qapi/string-output-visitor.h"
 #include "qapi/qobject-input-visitor.h"
 #include "qapi/forward-visitor.h"
 #include "qapi/qapi-builtin-visit.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/qmp/qjson.h"
 #include "trace.h"
 
 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  * of the QOM core on QObject?  */
 #include "qom/qom-qobject.h"
 #include "qapi/qmp/qbool.h"
 #include "qapi/qmp/qnum.h"
 #include "qapi/qmp/qstring.h"
 #include "qemu/error-report.h"
 
 #define MAX_INTERFACES 32
 
 typedef struct InterfaceImpl InterfaceImpl;
 typedef struct TypeImpl TypeImpl;
 
 struct InterfaceImpl
 {
     const char *typename;
 };
 
 struct TypeImpl
 {
     const char *name;
 
     size_t class_size;
 
     size_t instance_size;
     size_t instance_align;
 
     void (*class_init)(ObjectClass *klass, void *data);
     void (*class_base_init)(ObjectClass *klass, void *data);
 
     void *class_data;
 
     void (*instance_init)(Object *obj);
     void (*instance_post_init)(Object *obj);
     void (*instance_finalize)(Object *obj);
 
     bool abstract;
 
     const char *parent;
     TypeImpl *parent_type;
 
     ObjectClass *class;
 
     int num_interfaces;
     InterfaceImpl interfaces[MAX_INTERFACES];
 };
 
 static Type type_interface;
 
 static GHashTable *type_table_get(void)
 {
     static GHashTable *type_table;
 
     if (type_table == NULL) {
         type_table = g_hash_table_new(g_str_hash, g_str_equal);
     }
 
     return type_table;
 }
 
 static bool enumerating_types;
 
 static void type_table_add(TypeImpl *ti)
 {
     assert(!enumerating_types);
     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
 }
 
 static TypeImpl *type_table_lookup(const char *name)
 {
     return g_hash_table_lookup(type_table_get(), name);
 }
 
 static TypeImpl *type_new(const TypeInfo *info)
 {
     TypeImpl *ti = g_malloc0(sizeof(*ti));
     int i;
 
     g_assert(info->name != NULL);
 
     if (type_table_lookup(info->name) != NULL) {
         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
         abort();
     }
 
     ti->name = g_strdup(info->name);
     ti->parent = g_strdup(info->parent);
 
     ti->class_size = info->class_size;
     ti->instance_size = info->instance_size;
     ti->instance_align = info->instance_align;
 
     ti->class_init = info->class_init;
     ti->class_base_init = info->class_base_init;
     ti->class_data = info->class_data;
 
     ti->instance_init = info->instance_init;
     ti->instance_post_init = info->instance_post_init;
     ti->instance_finalize = info->instance_finalize;
 
     ti->abstract = info->abstract;
 
     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
     }
     ti->num_interfaces = i;
 
     return ti;
 }
 
 static TypeImpl *type_register_internal(const TypeInfo *info)
 {
     TypeImpl *ti;
     ti = type_new(info);
 
     type_table_add(ti);
     return ti;
 }
 
 TypeImpl *type_register(const TypeInfo *info)
 {
     assert(info->parent);
     return type_register_internal(info);
 }
 
 TypeImpl *type_register_static(const TypeInfo *info)
 {
     return type_register(info);
 }
 
 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 {
     int i;
 
     for (i = 0; i < nr_infos; i++) {
         type_register_static(&infos[i]);
     }
 }
 
 static TypeImpl *type_get_by_name(const char *name)
 {
     if (name == NULL) {
         return NULL;
     }
 
     return type_table_lookup(name);
 }
 
 static TypeImpl *type_get_parent(TypeImpl *type)
 {
     if (!type->parent_type && type->parent) {
         type->parent_type = type_get_by_name(type->parent);
         if (!type->parent_type) {
             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
                     type->name, type->parent);
             abort();
         }
     }
 
     return type->parent_type;
 }
 
 static bool type_has_parent(TypeImpl *type)
 {
     return (type->parent != NULL);
 }
 
 static size_t type_class_get_size(TypeImpl *ti)
 {
     if (ti->class_size) {
         return ti->class_size;
     }
 
     if (type_has_parent(ti)) {
         return type_class_get_size(type_get_parent(ti));
     }
 
     return sizeof(ObjectClass);
 }
 
 static size_t type_object_get_size(TypeImpl *ti)
 {
     if (ti->instance_size) {
         return ti->instance_size;
     }
 
     if (type_has_parent(ti)) {
         return type_object_get_size(type_get_parent(ti));
     }
 
     return 0;
 }
 
 size_t object_type_get_instance_size(const char *typename)
 {
     TypeImpl *type = type_get_by_name(typename);
 
     g_assert(type != NULL);
     return type_object_get_size(type);
 }
 
 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 {
     assert(target_type);
 
     /* Check if target_type is a direct ancestor of type */
     while (type) {
         if (type == target_type) {
             return true;
         }
 
         type = type_get_parent(type);
     }
 
     return false;
 }
 
 static void type_initialize(TypeImpl *ti);
 
 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
                                       TypeImpl *parent_type)
 {
     InterfaceClass *new_iface;
     TypeInfo info = { };
     TypeImpl *iface_impl;
 
     info.parent = parent_type->name;
     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
     info.abstract = true;
 
     iface_impl = type_new(&info);
     iface_impl->parent_type = parent_type;
     type_initialize(iface_impl);
     g_free((char *)info.name);
 
     new_iface = (InterfaceClass *)iface_impl->class;
     new_iface->concrete_class = ti->class;
     new_iface->interface_type = interface_type;
 
     ti->class->interfaces = g_slist_append(ti->class->interfaces, new_iface);
 }
 
 static void object_property_free(gpointer data)
 {
     ObjectProperty *prop = data;
 
     if (prop->defval) {
         qobject_unref(prop->defval);
         prop->defval = NULL;
     }
     g_free(prop->name);
     g_free(prop->type);
     g_free(prop->description);
     g_free(prop);
 }
 
 static void type_initialize(TypeImpl *ti)
 {
     TypeImpl *parent;
 
     if (ti->class) {
         return;
     }
 
     ti->class_size = type_class_get_size(ti);
     ti->instance_size = type_object_get_size(ti);
     /* Any type with zero instance_size is implicitly abstract.
      * This means interface types are all abstract.
      */
     if (ti->instance_size == 0) {
         ti->abstract = true;
     }
     if (type_is_ancestor(ti, type_interface)) {
         assert(ti->instance_size == 0);
         assert(ti->abstract);
         assert(!ti->instance_init);
         assert(!ti->instance_post_init);
         assert(!ti->instance_finalize);
         assert(!ti->num_interfaces);
     }
     ti->class = g_malloc0(ti->class_size);
 
     parent = type_get_parent(ti);
     if (parent) {
         type_initialize(parent);
         GSList *e;
         int i;
 
         g_assert(parent->class_size <= ti->class_size);
         g_assert(parent->instance_size <= ti->instance_size);
         memcpy(ti->class, parent->class, parent->class_size);
         ti->class->interfaces = NULL;
 
         for (e = parent->class->interfaces; e; e = e->next) {
             InterfaceClass *iface = e->data;
             ObjectClass *klass = OBJECT_CLASS(iface);
 
             type_initialize_interface(ti, iface->interface_type, klass->type);
         }
 
         for (i = 0; i < ti->num_interfaces; i++) {
             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
             if (!t) {
                 error_report("missing interface '%s' for object '%s'",
                              ti->interfaces[i].typename, parent->name);
                 abort();
             }
             for (e = ti->class->interfaces; e; e = e->next) {
                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 
                 if (type_is_ancestor(target_type, t)) {
                     break;
                 }
             }
 
             if (e) {
                 continue;
             }
 
             type_initialize_interface(ti, t, t);
         }
     }
 
     ti->class->properties = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
                                                   object_property_free);
 
     ti->class->type = ti;
 
     while (parent) {
         if (parent->class_base_init) {
             parent->class_base_init(ti->class, ti->class_data);
         }
         parent = type_get_parent(parent);
     }
 
     if (ti->class_init) {
         ti->class_init(ti->class, ti->class_data);
     }
 }
 
 static void object_init_with_type(Object *obj, TypeImpl *ti)
 {
     if (type_has_parent(ti)) {
         object_init_with_type(obj, type_get_parent(ti));
     }
 
     if (ti->instance_init) {
         ti->instance_init(obj);
     }
 }
 
 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 {
     if (ti->instance_post_init) {
         ti->instance_post_init(obj);
     }
 
     if (type_has_parent(ti)) {
         object_post_init_with_type(obj, type_get_parent(ti));
     }
 }
 
 bool object_apply_global_props(Object *obj, const GPtrArray *props,
                                Error **errp)
 {
     int i;
 
     if (!props) {
         return true;
     }
 
     for (i = 0; i < props->len; i++) {
         GlobalProperty *p = g_ptr_array_index(props, i);
         Error *err = NULL;
 
         if (object_dynamic_cast(obj, p->driver) == NULL) {
             continue;
         }
         if (p->optional && !object_property_find(obj, p->property)) {
             continue;
         }
         p->used = true;
         if (!object_property_parse(obj, p->property, p->value, &err)) {
             error_prepend(&err, "can't apply global %s.%s=%s: ",
                           p->driver, p->property, p->value);
             /*
              * If errp != NULL, propagate error and return.
              * If errp == NULL, report a warning, but keep going
              * with the remaining globals.
              */
             if (errp) {
                 error_propagate(errp, err);
                 return false;
             } else {
                 warn_report_err(err);
             }
         }
     }
 
     return true;
 }
 
 /*
  * Global property defaults
  * Slot 0: accelerator's global property defaults
  * Slot 1: machine's global property defaults
  * Slot 2: global properties from legacy command line option
  * Each is a GPtrArray of of GlobalProperty.
  * Applied in order, later entries override earlier ones.
  */
 static GPtrArray *object_compat_props[3];
 
 /*
  * Retrieve @GPtrArray for global property defined with options
  * other than "-global".  These are generally used for syntactic
  * sugar and legacy command line options.
  */
 void object_register_sugar_prop(const char *driver, const char *prop,
                                 const char *value, bool optional)
 {
     GlobalProperty *g;
     if (!object_compat_props[2]) {
         object_compat_props[2] = g_ptr_array_new();
     }
     g = g_new0(GlobalProperty, 1);
     g->driver = g_strdup(driver);
     g->property = g_strdup(prop);
     g->value = g_strdup(value);
     g->optional = optional;
     g_ptr_array_add(object_compat_props[2], g);
 }
 
 /*
  * Set machine's global property defaults to @compat_props.
  * May be called at most once.
  */
 void object_set_machine_compat_props(GPtrArray *compat_props)
 {
     assert(!object_compat_props[1]);
     object_compat_props[1] = compat_props;
 }
 
 /*
  * Set accelerator's global property defaults to @compat_props.
  * May be called at most once.
  */
 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 {
     assert(!object_compat_props[0]);
     object_compat_props[0] = compat_props;
 }
 
 void object_apply_compat_props(Object *obj)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
         object_apply_global_props(obj, object_compat_props[i],
                                   i == 2 ? &error_fatal : &error_abort);
     }
 }
 
 static void object_class_property_init_all(Object *obj)
 {
     ObjectPropertyIterator iter;
     ObjectProperty *prop;
 
     object_class_property_iter_init(&iter, object_get_class(obj));
     while ((prop = object_property_iter_next(&iter))) {
         if (prop->init) {
             prop->init(obj, prop);
         }
     }
 }
 
 static void object_initialize_with_type(Object *obj, size_t size, TypeImpl *type)
 {
     type_initialize(type);
 
     g_assert(type->instance_size >= sizeof(Object));
     g_assert(type->abstract == false);
     g_assert(size >= type->instance_size);
 
     memset(obj, 0, type->instance_size);
     obj->class = type->class;
     object_ref(obj);
     object_class_property_init_all(obj);
     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
                                             NULL, object_property_free);
     object_init_with_type(obj, type);
     object_post_init_with_type(obj, type);
 }
 
 void object_initialize(void *data, size_t size, const char *typename)
 {
     TypeImpl *type = type_get_by_name(typename);
 
 #ifdef CONFIG_MODULES
     if (!type) {
         int rv = module_load_qom(typename, &error_fatal);
         if (rv > 0) {
             type = type_get_by_name(typename);
         } else {
             error_report("missing object type '%s'", typename);
             exit(1);
         }
     }
 #endif
     if (!type) {
         error_report("missing object type '%s'", typename);
         abort();
     }
 
     object_initialize_with_type(data, size, type);
 }
 
 bool object_initialize_child_with_props(Object *parentobj,
                                         const char *propname,
                                         void *childobj, size_t size,
                                         const char *type,
                                         Error **errp, ...)
 {
     va_list vargs;
     bool ok;
 
     va_start(vargs, errp);
     ok = object_initialize_child_with_propsv(parentobj, propname,
                                              childobj, size, type, errp,
                                              vargs);
     va_end(vargs);
     return ok;
 }
 
 bool object_initialize_child_with_propsv(Object *parentobj,
                                          const char *propname,
                                          void *childobj, size_t size,
                                          const char *type,
                                          Error **errp, va_list vargs)
 {
     bool ok = false;
     Object *obj;
     UserCreatable *uc;
 
     object_initialize(childobj, size, type);
     obj = OBJECT(childobj);
 
     if (!object_set_propv(obj, errp, vargs)) {
         goto out;
     }
 
     object_property_add_child(parentobj, propname, obj);
 
     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
     if (uc) {
         if (!user_creatable_complete(uc, errp)) {
             object_unparent(obj);
             goto out;
         }
     }
 
     ok = true;
 
 out:
     /*
      * We want @obj's reference to be 1 on success, 0 on failure.
      * On success, it's 2: one taken by object_initialize(), and one
      * by object_property_add_child().
      * On failure in object_initialize() or earlier, it's 1.
      * On failure afterwards, it's also 1: object_unparent() releases
      * the reference taken by object_property_add_child().
      */
     object_unref(obj);
     return ok;
 }
 
 void object_initialize_child_internal(Object *parent,
                                       const char *propname,
                                       void *child, size_t size,
                                       const char *type)
 {
     object_initialize_child_with_props(parent, propname, child, size, type,
                                        &error_abort, NULL);
 }
 
 static inline bool object_property_is_child(ObjectProperty *prop)
 {
     return strstart(prop->type, "child<", NULL);
 }
 
 static void object_property_del_all(Object *obj)
 {
     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
     ObjectProperty *prop;
     ObjectPropertyIterator iter;
     bool released;
 
     do {
         released = false;
         object_property_iter_init(&iter, obj);
         while ((prop = object_property_iter_next(&iter)) != NULL) {
             if (g_hash_table_add(done, prop)) {
                 if (prop->release) {
                     prop->release(obj, prop->name, prop->opaque);
                     released = true;
                     break;
                 }
             }
         }
     } while (released);
 
     g_hash_table_unref(obj->properties);
 }
 
 static void object_property_del_child(Object *obj, Object *child)
 {
     ObjectProperty *prop;
     GHashTableIter iter;
     gpointer key, value;
 
     g_hash_table_iter_init(&iter, obj->properties);
     while (g_hash_table_iter_next(&iter, &key, &value)) {
         prop = value;
         if (object_property_is_child(prop) && prop->opaque == child) {
             if (prop->release) {
                 prop->release(obj, prop->name, prop->opaque);
                 prop->release = NULL;
             }
             break;
         }
     }
     g_hash_table_iter_init(&iter, obj->properties);
     while (g_hash_table_iter_next(&iter, &key, &value)) {
         prop = value;
         if (object_property_is_child(prop) && prop->opaque == child) {
             g_hash_table_iter_remove(&iter);
             break;
         }
     }
 }
 
 void object_unparent(Object *obj)
 {
     if (obj->parent) {
         object_property_del_child(obj->parent, obj);
     }
 }
 
 static void object_deinit(Object *obj, TypeImpl *type)
 {
     if (type->instance_finalize) {
         type->instance_finalize(obj);
     }
 
     if (type_has_parent(type)) {
         object_deinit(obj, type_get_parent(type));
     }
 }
 
 static void object_finalize(void *data)
 {
     Object *obj = data;
     TypeImpl *ti = obj->class->type;
 
     object_property_del_all(obj);
     object_deinit(obj, ti);
 
     g_assert(obj->ref == 0);
     g_assert(obj->parent == NULL);
     if (obj->free) {
         obj->free(obj);
     }
 }
 
 /* Find the minimum alignment guaranteed by the system malloc. */
 #if __STDC_VERSION__ >= 201112L
 typedef max_align_t qemu_max_align_t;
 #else
 typedef union {
     long l;
     void *p;
     double d;
     long double ld;
 } qemu_max_align_t;
 #endif
 
 static Object *object_new_with_type(Type type)
 {
     Object *obj;
     size_t size, align;
     void (*obj_free)(void *);
 
     g_assert(type != NULL);
     type_initialize(type);
 
     size = type->instance_size;
     align = type->instance_align;
 
     /*
      * Do not use qemu_memalign unless required.  Depending on the
      * implementation, extra alignment implies extra overhead.
      */
     if (likely(align <= __alignof__(qemu_max_align_t))) {
         obj = g_malloc(size);
         obj_free = g_free;
     } else {
         obj = qemu_memalign(align, size);
         obj_free = qemu_vfree;
     }
 
     object_initialize_with_type(obj, size, type);
     obj->free = obj_free;
 
     return obj;
 }
 
 Object *object_new_with_class(ObjectClass *klass)
 {
     return object_new_with_type(klass->type);
 }
 
 Object *object_new(const char *typename)
 {
     TypeImpl *ti = type_get_by_name(typename);
 
     return object_new_with_type(ti);
 }
 
 
 Object *object_new_with_props(const char *typename,
                               Object *parent,
                               const char *id,
                               Error **errp,
                               ...)
 {
     va_list vargs;
     Object *obj;
 
     va_start(vargs, errp);
     obj = object_new_with_propv(typename, parent, id, errp, vargs);
     va_end(vargs);
 
     return obj;
 }
 
 
 Object *object_new_with_propv(const char *typename,
                               Object *parent,
                               const char *id,
                               Error **errp,
                               va_list vargs)
 {
     Object *obj;
     ObjectClass *klass;
     UserCreatable *uc;
 
     klass = object_class_by_name(typename);
     if (!klass) {
         error_setg(errp, "invalid object type: %s", typename);
         return NULL;
     }
 
     if (object_class_is_abstract(klass)) {
         error_setg(errp, "object type '%s' is abstract", typename);
         return NULL;
     }
     obj = object_new_with_type(klass->type);
 
     if (!object_set_propv(obj, errp, vargs)) {
         goto error;
     }
 
     if (id != NULL) {
         object_property_add_child(parent, id, obj);
     }
 
     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
     if (uc) {
         if (!user_creatable_complete(uc, errp)) {
             if (id != NULL) {
                 object_unparent(obj);
             }
             goto error;
         }
     }
 
     object_unref(obj);
     return obj;
 
  error:
     object_unref(obj);
     return NULL;
 }
 
 
 bool object_set_props(Object *obj,
                      Error **errp,
                      ...)
 {
     va_list vargs;
     bool ret;
 
     va_start(vargs, errp);
     ret = object_set_propv(obj, errp, vargs);
     va_end(vargs);
 
     return ret;
 }
 
 
 bool object_set_propv(Object *obj,
                      Error **errp,
                      va_list vargs)
 {
     const char *propname;
 
     propname = va_arg(vargs, char *);
     while (propname != NULL) {
         const char *value = va_arg(vargs, char *);
 
         g_assert(value != NULL);
         if (!object_property_parse(obj, propname, value, errp)) {
             return false;
         }
         propname = va_arg(vargs, char *);
     }
 
     return true;
 }
 
 
 Object *object_dynamic_cast(Object *obj, const char *typename)
 {
     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
         return obj;
     }
 
     return NULL;
 }
 
 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
                                    const char *file, int line, const char *func)
 {
     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
                                      typename, file, line, func);
 
 #ifdef CONFIG_QOM_CAST_DEBUG
     int i;
     Object *inst;
 
     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
         if (qatomic_read(&obj->class->object_cast_cache[i]) == typename) {
             goto out;
         }
     }
 
     inst = object_dynamic_cast(obj, typename);
 
     if (!inst && obj) {
         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
                 file, line, func, obj, typename);
         abort();
     }
 
     assert(obj == inst);
 
     if (obj && obj == inst) {
         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
             qatomic_set(&obj->class->object_cast_cache[i - 1],
                        qatomic_read(&obj->class->object_cast_cache[i]));
         }
         qatomic_set(&obj->class->object_cast_cache[i - 1], typename);
     }
 
 out:
 #endif
     return obj;
 }
 
 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
                                        const char *typename)
 {
     ObjectClass *ret = NULL;
     TypeImpl *target_type;
     TypeImpl *type;
 
     if (!class) {
         return NULL;
     }
 
     /* A simple fast path that can trigger a lot for leaf classes.  */
     type = class->type;
     if (type->name == typename) {
         return class;
     }
 
     target_type = type_get_by_name(typename);
     if (!target_type) {
         /* target class type unknown, so fail the cast */
         return NULL;
     }
 
     if (type->class->interfaces &&
             type_is_ancestor(target_type, type_interface)) {
         int found = 0;
         GSList *i;
 
         for (i = class->interfaces; i; i = i->next) {
             ObjectClass *target_class = i->data;
 
             if (type_is_ancestor(target_class->type, target_type)) {
                 ret = target_class;
                 found++;
             }
          }
 
         /* The match was ambiguous, don't allow a cast */
         if (found > 1) {
             ret = NULL;
         }
     } else if (type_is_ancestor(type, target_type)) {
         ret = class;
     }
 
     return ret;
 }
 
 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
                                               const char *typename,
                                               const char *file, int line,
                                               const char *func)
 {
     ObjectClass *ret;
 
     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
                                            typename, file, line, func);
 
 #ifdef CONFIG_QOM_CAST_DEBUG
     int i;
 
     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
         if (qatomic_read(&class->class_cast_cache[i]) == typename) {
             ret = class;
             goto out;
         }
     }
 #else
     if (!class || !class->interfaces) {
         return class;
     }
 #endif
 
     ret = object_class_dynamic_cast(class, typename);
     if (!ret && class) {
         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
                 file, line, func, class, typename);
         abort();
     }
 
 #ifdef CONFIG_QOM_CAST_DEBUG
     if (class && ret == class) {
         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
             qatomic_set(&class->class_cast_cache[i - 1],
                        qatomic_read(&class->class_cast_cache[i]));
         }
         qatomic_set(&class->class_cast_cache[i - 1], typename);
     }
 out:
 #endif
     return ret;
 }
 
 const char *object_get_typename(const Object *obj)
 {
     return obj->class->type->name;
 }
 
 ObjectClass *object_get_class(Object *obj)
 {
     return obj->class;
 }
 
 bool object_class_is_abstract(ObjectClass *klass)
 {
     return klass->type->abstract;
 }
 
 const char *object_class_get_name(ObjectClass *klass)
 {
     return klass->type->name;
 }
 
 ObjectClass *object_class_by_name(const char *typename)
 {
     TypeImpl *type = type_get_by_name(typename);
 
     if (!type) {
         return NULL;
     }
 
     type_initialize(type);
 
     return type->class;
 }
 
 ObjectClass *module_object_class_by_name(const char *typename)
 {
     ObjectClass *oc;
 
     oc = object_class_by_name(typename);
 #ifdef CONFIG_MODULES
     if (!oc) {
         Error *local_err = NULL;
         int rv = module_load_qom(typename, &local_err);
         if (rv > 0) {
             oc = object_class_by_name(typename);
         } else if (rv < 0) {
             error_report_err(local_err);
         }
     }
 #endif
     return oc;
 }
 
 ObjectClass *object_class_get_parent(ObjectClass *class)
 {
     TypeImpl *type = type_get_parent(class->type);
 
     if (!type) {
         return NULL;
     }
 
     type_initialize(type);
 
     return type->class;
 }
 
 typedef struct OCFData
 {
     void (*fn)(ObjectClass *klass, void *opaque);
     const char *implements_type;
     bool include_abstract;
     void *opaque;
 } OCFData;
 
 static void object_class_foreach_tramp(gpointer key, gpointer value,
                                        gpointer opaque)
 {
     OCFData *data = opaque;
     TypeImpl *type = value;
     ObjectClass *k;
 
     type_initialize(type);
     k = type->class;
 
     if (!data->include_abstract && type->abstract) {
         return;
     }
 
     if (data->implements_type && 
         !object_class_dynamic_cast(k, data->implements_type)) {
         return;
     }
 
     data->fn(k, data->opaque);
 }
 
 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
                           const char *implements_type, bool include_abstract,
                           void *opaque)
 {
     OCFData data = { fn, implements_type, include_abstract, opaque };
 
     enumerating_types = true;
     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
     enumerating_types = false;
 }
 
 static int do_object_child_foreach(Object *obj,
                                    int (*fn)(Object *child, void *opaque),
                                    void *opaque, bool recurse)
 {
     GHashTableIter iter;
     ObjectProperty *prop;
     int ret = 0;
 
     g_hash_table_iter_init(&iter, obj->properties);
     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
         if (object_property_is_child(prop)) {
             Object *child = prop->opaque;
 
             ret = fn(child, opaque);
             if (ret != 0) {
                 break;
             }
             if (recurse) {
                 ret = do_object_child_foreach(child, fn, opaque, true);
                 if (ret != 0) {
                     break;
                 }
             }
         }
     }
     return ret;
 }
 
 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
                          void *opaque)
 {
     return do_object_child_foreach(obj, fn, opaque, false);
 }
 
 int object_child_foreach_recursive(Object *obj,
                                    int (*fn)(Object *child, void *opaque),
                                    void *opaque)
 {
     return do_object_child_foreach(obj, fn, opaque, true);
 }
 
 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 {
     GSList **list = opaque;
 
     *list = g_slist_prepend(*list, klass);
 }
 
 GSList *object_class_get_list(const char *implements_type,
                               bool include_abstract)
 {
     GSList *list = NULL;
 
     object_class_foreach(object_class_get_list_tramp,
                          implements_type, include_abstract, &list);
     return list;
 }
 
 static gint object_class_cmp(gconstpointer a, gconstpointer b)
 {
     return strcasecmp(object_class_get_name((ObjectClass *)a),
                       object_class_get_name((ObjectClass *)b));
 }
 
 GSList *object_class_get_list_sorted(const char *implements_type,
                                      bool include_abstract)
 {
     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
                         object_class_cmp);
 }
 
 Object *object_ref(void *objptr)
 {
     Object *obj = OBJECT(objptr);
     uint32_t ref;
 
     if (!obj) {
         return NULL;
     }
     ref = qatomic_fetch_inc(&obj->ref);
     /* Assert waaay before the integer overflows */
     g_assert(ref < INT_MAX);
     return obj;
 }
 
 void object_unref(void *objptr)
 {
     Object *obj = OBJECT(objptr);
     if (!obj) {
         return;
     }
     g_assert(obj->ref > 0);
 
     /* parent always holds a reference to its children */
     if (qatomic_fetch_dec(&obj->ref) == 1) {
         object_finalize(obj);
     }
 }
 
 ObjectProperty *
 object_property_try_add(Object *obj, const char *name, const char *type,
                         ObjectPropertyAccessor *get,
                         ObjectPropertyAccessor *set,
                         ObjectPropertyRelease *release,
                         void *opaque, Error **errp)
 {
     ObjectProperty *prop;
     size_t name_len = strlen(name);
 
     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
         int i;
         ObjectProperty *ret = NULL;
         char *name_no_array = g_strdup(name);
 
         name_no_array[name_len - 3] = '\0';
         for (i = 0; i < INT16_MAX; ++i) {
             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 
             ret = object_property_try_add(obj, full_name, type, get, set,
                                           release, opaque, NULL);
             g_free(full_name);
             if (ret) {
                 break;
             }
         }
         g_free(name_no_array);
         assert(ret);
         return ret;
     }
 
     if (object_property_find(obj, name) != NULL) {
         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
                    name, object_get_typename(obj));
         return NULL;
     }
 
     prop = g_malloc0(sizeof(*prop));
 
     prop->name = g_strdup(name);
     prop->type = g_strdup(type);
 
     prop->get = get;
     prop->set = set;
     prop->release = release;
     prop->opaque = opaque;
 
     g_hash_table_insert(obj->properties, prop->name, prop);
     return prop;
 }
 
 ObjectProperty *
 object_property_add(Object *obj, const char *name, const char *type,
                     ObjectPropertyAccessor *get,
                     ObjectPropertyAccessor *set,
                     ObjectPropertyRelease *release,
                     void *opaque)
 {
     return object_property_try_add(obj, name, type, get, set, release,
                                    opaque, &error_abort);
 }
 
 ObjectProperty *
 object_class_property_add(ObjectClass *klass,
                           const char *name,
                           const char *type,
                           ObjectPropertyAccessor *get,
                           ObjectPropertyAccessor *set,
                           ObjectPropertyRelease *release,
                           void *opaque)
 {
     ObjectProperty *prop;
 
     assert(!object_class_property_find(klass, name));
 
     prop = g_malloc0(sizeof(*prop));
 
     prop->name = g_strdup(name);
     prop->type = g_strdup(type);
 
     prop->get = get;
     prop->set = set;
     prop->release = release;
     prop->opaque = opaque;
 
     g_hash_table_insert(klass->properties, prop->name, prop);
 
     return prop;
 }
 
 ObjectProperty *object_property_find(Object *obj, const char *name)
 {
     ObjectProperty *prop;
     ObjectClass *klass = object_get_class(obj);
 
     prop = object_class_property_find(klass, name);
     if (prop) {
         return prop;
     }
 
     return g_hash_table_lookup(obj->properties, name);
 }
 
 ObjectProperty *object_property_find_err(Object *obj, const char *name,
                                          Error **errp)
 {
     ObjectProperty *prop = object_property_find(obj, name);
     if (!prop) {
         error_setg(errp, "Property '%s.%s' not found",
                    object_get_typename(obj), name);
     }
     return prop;
 }
 
 void object_property_iter_init(ObjectPropertyIterator *iter,
                                Object *obj)
 {
     g_hash_table_iter_init(&iter->iter, obj->properties);
     iter->nextclass = object_get_class(obj);
 }
 
 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
 {
     gpointer key, val;
     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
         if (!iter->nextclass) {
             return NULL;
         }
         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
         iter->nextclass = object_class_get_parent(iter->nextclass);
     }
     return val;
 }
 
 void object_class_property_iter_init(ObjectPropertyIterator *iter,
                                      ObjectClass *klass)
 {
     g_hash_table_iter_init(&iter->iter, klass->properties);
     iter->nextclass = object_class_get_parent(klass);
 }
 
 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name)
 {
     ObjectClass *parent_klass;
 
     parent_klass = object_class_get_parent(klass);
     if (parent_klass) {
         ObjectProperty *prop =
             object_class_property_find(parent_klass, name);
         if (prop) {
             return prop;
         }
     }
 
     return g_hash_table_lookup(klass->properties, name);
 }
 
 ObjectProperty *object_class_property_find_err(ObjectClass *klass,
                                                const char *name,
                                                Error **errp)
 {
     ObjectProperty *prop = object_class_property_find(klass, name);
     if (!prop) {
         error_setg(errp, "Property '.%s' not found", name);
     }
     return prop;
 }
 
 
 void object_property_del(Object *obj, const char *name)
 {
     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
 
     if (prop->release) {
         prop->release(obj, name, prop->opaque);
     }
     g_hash_table_remove(obj->properties, name);
 }
 
 bool object_property_get(Object *obj, const char *name, Visitor *v,
                          Error **errp)
 {
     Error *err = NULL;
     ObjectProperty *prop = object_property_find_err(obj, name, errp);
 
     if (prop == NULL) {
         return false;
     }
 
     if (!prop->get) {
         error_setg(errp, "Property '%s.%s' is not readable",
                    object_get_typename(obj), name);
         return false;
     }
     prop->get(obj, v, name, prop->opaque, &err);
     error_propagate(errp, err);
     return !err;
 }
 
 bool object_property_set(Object *obj, const char *name, Visitor *v,
                          Error **errp)
 {
     ERRP_GUARD();
     ObjectProperty *prop = object_property_find_err(obj, name, errp);
 
     if (prop == NULL) {
         return false;
     }
 
     if (!prop->set) {
         error_setg(errp, "Property '%s.%s' is not writable",
                    object_get_typename(obj), name);
         return false;
     }
     prop->set(obj, v, name, prop->opaque, errp);
     return !*errp;
 }
 
 bool object_property_set_str(Object *obj, const char *name,
                              const char *value, Error **errp)
 {
     QString *qstr = qstring_from_str(value);
     bool ok = object_property_set_qobject(obj, name, QOBJECT(qstr), errp);
 
     qobject_unref(qstr);
     return ok;
 }
 
 char *object_property_get_str(Object *obj, const char *name,
                               Error **errp)
 {
     QObject *ret = object_property_get_qobject(obj, name, errp);
     QString *qstring;
     char *retval;
 
     if (!ret) {
         return NULL;
     }
     qstring = qobject_to(QString, ret);
     if (!qstring) {
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
         retval = NULL;
     } else {
         retval = g_strdup(qstring_get_str(qstring));
     }
 
     qobject_unref(ret);
     return retval;
 }
 
 bool object_property_set_link(Object *obj, const char *name,
                               Object *value, Error **errp)
 {
     g_autofree char *path = NULL;
 
     if (value) {
         path = object_get_canonical_path(value);
     }
     return object_property_set_str(obj, name, path ?: "", errp);
 }
 
 Object *object_property_get_link(Object *obj, const char *name,
                                  Error **errp)
 {
     char *str = object_property_get_str(obj, name, errp);
     Object *target = NULL;
 
     if (str && *str) {
         target = object_resolve_path(str, NULL);
         if (!target) {
             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                       "Device '%s' not found", str);
         }
     }
 
     g_free(str);
     return target;
 }
 
 bool object_property_set_bool(Object *obj, const char *name,
                               bool value, Error **errp)
 {
     QBool *qbool = qbool_from_bool(value);
     bool ok = object_property_set_qobject(obj, name, QOBJECT(qbool), errp);
 
     qobject_unref(qbool);
     return ok;
 }
 
 bool object_property_get_bool(Object *obj, const char *name,
                               Error **errp)
 {
     QObject *ret = object_property_get_qobject(obj, name, errp);
     QBool *qbool;
     bool retval;
 
     if (!ret) {
         return false;
     }
     qbool = qobject_to(QBool, ret);
     if (!qbool) {
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
         retval = false;
     } else {
         retval = qbool_get_bool(qbool);
     }
 
     qobject_unref(ret);
     return retval;
 }
 
 bool object_property_set_int(Object *obj, const char *name,
                              int64_t value, Error **errp)
 {
     QNum *qnum = qnum_from_int(value);
     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
 
     qobject_unref(qnum);
     return ok;
 }
 
 int64_t object_property_get_int(Object *obj, const char *name,
                                 Error **errp)
 {
     QObject *ret = object_property_get_qobject(obj, name, errp);
     QNum *qnum;
     int64_t retval;
 
     if (!ret) {
         return -1;
     }
 
     qnum = qobject_to(QNum, ret);
     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
         retval = -1;
     }
 
     qobject_unref(ret);
     return retval;
 }
 
 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
 {
     Visitor *v = qobject_input_visitor_new(prop->defval);
 
     assert(prop->set != NULL);
     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
 
     visit_free(v);
 }
 
 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
 {
     assert(!prop->defval);
     assert(!prop->init);
 
     prop->defval = defval;
     prop->init = object_property_init_defval;
 }
 
 void object_property_set_default_bool(ObjectProperty *prop, bool value)
 {
     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
 }
 
 void object_property_set_default_str(ObjectProperty *prop, const char *value)
 {
     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
 }
 
 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
 {
     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
 }
 
 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
 {
     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
 }
 
 bool object_property_set_uint(Object *obj, const char *name,
                               uint64_t value, Error **errp)
 {
     QNum *qnum = qnum_from_uint(value);
     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
 
     qobject_unref(qnum);
     return ok;
 }
 
 uint64_t object_property_get_uint(Object *obj, const char *name,
                                   Error **errp)
 {
     QObject *ret = object_property_get_qobject(obj, name, errp);
     QNum *qnum;
     uint64_t retval;
 
     if (!ret) {
         return 0;
     }
     qnum = qobject_to(QNum, ret);
     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
         retval = 0;
     }
 
     qobject_unref(ret);
     return retval;
 }
 
 typedef struct EnumProperty {
     const QEnumLookup *lookup;
     int (*get)(Object *, Error **);
     void (*set)(Object *, int, Error **);
 } EnumProperty;
 
 int object_property_get_enum(Object *obj, const char *name,
                              const char *typename, Error **errp)
 {
     char *str;
     int ret;
     ObjectProperty *prop = object_property_find_err(obj, name, errp);
     EnumProperty *enumprop;
 
     if (prop == NULL) {
         return -1;
     }
 
     if (!g_str_equal(prop->type, typename)) {
         error_setg(errp, "Property %s on %s is not '%s' enum type",
                    name, object_class_get_name(
                        object_get_class(obj)), typename);
         return -1;
     }
 
     enumprop = prop->opaque;
 
     str = object_property_get_str(obj, name, errp);
     if (!str) {
         return -1;
     }
 
     ret = qapi_enum_parse(enumprop->lookup, str, -1, errp);
     g_free(str);
 
     return ret;
 }
 
 bool object_property_parse(Object *obj, const char *name,
                            const char *string, Error **errp)
 {
     Visitor *v = string_input_visitor_new(string);
     bool ok = object_property_set(obj, name, v, errp);
 
     visit_free(v);
     return ok;
 }
 
 char *object_property_print(Object *obj, const char *name, bool human,
                             Error **errp)
 {
     Visitor *v;
     char *string = NULL;
 
     v = string_output_visitor_new(human, &string);
     if (!object_property_get(obj, name, v, errp)) {
         goto out;
     }
 
     visit_complete(v, &string);
 
 out:
     visit_free(v);
     return string;
 }
 
 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
 {
     ObjectProperty *prop = object_property_find_err(obj, name, errp);
     if (prop == NULL) {
         return NULL;
     }
 
     return prop->type;
 }
 
 Object *object_get_root(void)
 {
     static Object *root;
 
     if (!root) {
         root = object_new("container");
     }
 
     return root;
 }
 
 Object *object_get_objects_root(void)
 {
     return container_get(object_get_root(), "/objects");
 }
 
 Object *object_get_internal_root(void)
 {
     static Object *internal_root;
 
     if (!internal_root) {
         internal_root = object_new("container");
     }
 
     return internal_root;
 }
 
 static void object_get_child_property(Object *obj, Visitor *v,
                                       const char *name, void *opaque,
                                       Error **errp)
 {
     Object *child = opaque;
     char *path;
 
     path = object_get_canonical_path(child);
     visit_type_str(v, name, &path, errp);
     g_free(path);
 }
 
 static Object *object_resolve_child_property(Object *parent, void *opaque,
                                              const char *part)
 {
     return opaque;
 }
 
 static void object_finalize_child_property(Object *obj, const char *name,
                                            void *opaque)
 {
     Object *child = opaque;
 
     if (child->class->unparent) {
         (child->class->unparent)(child);
     }
     child->parent = NULL;
     object_unref(child);
 }
 
 ObjectProperty *
 object_property_try_add_child(Object *obj, const char *name,
                               Object *child, Error **errp)
 {
     g_autofree char *type = NULL;
     ObjectProperty *op;
 
     assert(!child->parent);
 
     type = g_strdup_printf("child<%s>", object_get_typename(child));
 
     op = object_property_try_add(obj, name, type, object_get_child_property,
                                  NULL, object_finalize_child_property,
                                  child, errp);
     if (!op) {
         return NULL;
     }
     op->resolve = object_resolve_child_property;
     object_ref(child);
     child->parent = obj;
     return op;
 }
 
 ObjectProperty *
 object_property_add_child(Object *obj, const char *name,
                           Object *child)
 {
     return object_property_try_add_child(obj, name, child, &error_abort);
 }
 
 void object_property_allow_set_link(const Object *obj, const char *name,
                                     Object *val, Error **errp)
 {
     /* Allow the link to be set, always */
 }
 
 typedef struct {
     union {
         Object **targetp;
         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
     };
     void (*check)(const Object *, const char *, Object *, Error **);
     ObjectPropertyLinkFlags flags;
 } LinkProperty;
 
 static Object **
 object_link_get_targetp(Object *obj, LinkProperty *lprop)
 {
     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
         return &lprop->target;
     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
         return (void *)obj + lprop->offset;
     } else {
         return lprop->targetp;
     }
 }
 
 static void object_get_link_property(Object *obj, Visitor *v,
                                      const char *name, void *opaque,
                                      Error **errp)
 {
     LinkProperty *lprop = opaque;
     Object **targetp = object_link_get_targetp(obj, lprop);
     char *path;
 
     if (*targetp) {
         path = object_get_canonical_path(*targetp);
         visit_type_str(v, name, &path, errp);
         g_free(path);
     } else {
         path = (char *)"";
         visit_type_str(v, name, &path, errp);
     }
 }
 
 /*
  * object_resolve_link:
  *
  * Lookup an object and ensure its type matches the link property type.  This
  * is similar to object_resolve_path() except type verification against the
  * link property is performed.
  *
  * Returns: The matched object or NULL on path lookup failures.
  */
 static Object *object_resolve_link(Object *obj, const char *name,
                                    const char *path, Error **errp)
 {
     const char *type;
     char *target_type;
     bool ambiguous = false;
     Object *target;
 
     /* Go from link<FOO> to FOO.  */
     type = object_property_get_type(obj, name, NULL);
     target_type = g_strndup(&type[5], strlen(type) - 6);
     target = object_resolve_path_type(path, target_type, &ambiguous);
 
     if (ambiguous) {
         error_setg(errp, "Path '%s' does not uniquely identify an object",
                    path);
     } else if (!target) {
         target = object_resolve_path(path, &ambiguous);
         if (target || ambiguous) {
             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
         } else {
             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                       "Device '%s' not found", path);
         }
         target = NULL;
     }
     g_free(target_type);
 
     return target;
 }
 
 static void object_set_link_property(Object *obj, Visitor *v,
                                      const char *name, void *opaque,
                                      Error **errp)
 {
     Error *local_err = NULL;
     LinkProperty *prop = opaque;
     Object **targetp = object_link_get_targetp(obj, prop);
     Object *old_target = *targetp;
     Object *new_target;
     char *path = NULL;
 
     if (!visit_type_str(v, name, &path, errp)) {
         return;
     }
 
     if (*path) {
         new_target = object_resolve_link(obj, name, path, errp);
         if (!new_target) {
             g_free(path);
             return;
         }
     } else {
         new_target = NULL;
     }
 
     g_free(path);
 
     prop->check(obj, name, new_target, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
 
     *targetp = new_target;
     if (prop->flags & OBJ_PROP_LINK_STRONG) {
         object_ref(new_target);
         object_unref(old_target);
     }
 }
 
 static Object *object_resolve_link_property(Object *parent, void *opaque,
                                             const char *part)
 {
     LinkProperty *lprop = opaque;
 
     return *object_link_get_targetp(parent, lprop);
 }
 
 static void object_release_link_property(Object *obj, const char *name,
                                          void *opaque)
 {
     LinkProperty *prop = opaque;
     Object **targetp = object_link_get_targetp(obj, prop);
 
     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
         object_unref(*targetp);
     }
     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
         g_free(prop);
     }
 }
 
 static ObjectProperty *
 object_add_link_prop(Object *obj, const char *name,
                      const char *type, void *ptr,
                      void (*check)(const Object *, const char *,
                                    Object *, Error **),
                      ObjectPropertyLinkFlags flags)
 {
     LinkProperty *prop = g_malloc(sizeof(*prop));
     g_autofree char *full_type = NULL;
     ObjectProperty *op;
 
     if (flags & OBJ_PROP_LINK_DIRECT) {
         prop->target = ptr;
     } else {
         prop->targetp = ptr;
     }
     prop->check = check;
     prop->flags = flags;
 
     full_type = g_strdup_printf("link<%s>", type);
 
     op = object_property_add(obj, name, full_type,
                              object_get_link_property,
                              check ? object_set_link_property : NULL,
                              object_release_link_property,
                              prop);
     op->resolve = object_resolve_link_property;
     return op;
 }
 
 ObjectProperty *
 object_property_add_link(Object *obj, const char *name,
                          const char *type, Object **targetp,
                          void (*check)(const Object *, const char *,
                                        Object *, Error **),
                          ObjectPropertyLinkFlags flags)
 {
     return object_add_link_prop(obj, name, type, targetp, check, flags);
 }
 
 ObjectProperty *
 object_class_property_add_link(ObjectClass *oc,
     const char *name,
     const char *type, ptrdiff_t offset,
     void (*check)(const Object *obj, const char *name,
                   Object *val, Error **errp),
     ObjectPropertyLinkFlags flags)
 {
     LinkProperty *prop = g_new0(LinkProperty, 1);
     char *full_type;
     ObjectProperty *op;
 
     prop->offset = offset;
     prop->check = check;
     prop->flags = flags | OBJ_PROP_LINK_CLASS;
 
     full_type = g_strdup_printf("link<%s>", type);
 
     op = object_class_property_add(oc, name, full_type,
                                    object_get_link_property,
                                    check ? object_set_link_property : NULL,
                                    object_release_link_property,
                                    prop);
 
     op->resolve = object_resolve_link_property;
 
     g_free(full_type);
     return op;
 }
 
 ObjectProperty *
 object_property_add_const_link(Object *obj, const char *name,
                                Object *target)
 {
     return object_add_link_prop(obj, name,
                                 object_get_typename(target), target,
                                 NULL, OBJ_PROP_LINK_DIRECT);
 }
 
 const char *object_get_canonical_path_component(const Object *obj)
 {
     ObjectProperty *prop = NULL;
     GHashTableIter iter;
 
     if (obj->parent == NULL) {
         return NULL;
     }
 
     g_hash_table_iter_init(&iter, obj->parent->properties);
     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
         if (!object_property_is_child(prop)) {
             continue;
         }
 
         if (prop->opaque == obj) {
             return prop->name;
         }
     }
 
     /* obj had a parent but was not a child, should never happen */
     g_assert_not_reached();
     return NULL;
 }
 
 char *object_get_canonical_path(const Object *obj)
 {
     Object *root = object_get_root();
     char *newpath, *path = NULL;
 
     if (obj == root) {
         return g_strdup("/");
     }
 
     do {
         const char *component = object_get_canonical_path_component(obj);
 
         if (!component) {
             /* A canonical path must be complete, so discard what was
              * collected so far.
              */
             g_free(path);
             return NULL;
         }
 
         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
         g_free(path);
         path = newpath;
         obj = obj->parent;
     } while (obj != root);
 
     return path;
 }
 
 Object *object_resolve_path_component(Object *parent, const char *part)
 {
     ObjectProperty *prop = object_property_find(parent, part);
     if (prop == NULL) {
         return NULL;
     }
 
     if (prop->resolve) {
         return prop->resolve(parent, prop->opaque, part);
     } else {
         return NULL;
     }
 }
 
 static Object *object_resolve_abs_path(Object *parent,
                                           char **parts,
                                           const char *typename)
 {
     Object *child;
 
     if (*parts == NULL) {
         return object_dynamic_cast(parent, typename);
     }
 
     if (strcmp(*parts, "") == 0) {
         return object_resolve_abs_path(parent, parts + 1, typename);
     }
 
     child = object_resolve_path_component(parent, *parts);
     if (!child) {
         return NULL;
     }
 
     return object_resolve_abs_path(child, parts + 1, typename);
 }
 
 static Object *object_resolve_partial_path(Object *parent,
                                            char **parts,
                                            const char *typename,
                                            bool *ambiguous)
 {
     Object *obj;
     GHashTableIter iter;
     ObjectProperty *prop;
 
     obj = object_resolve_abs_path(parent, parts, typename);
 
     g_hash_table_iter_init(&iter, parent->properties);
     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
         Object *found;
 
         if (!object_property_is_child(prop)) {
             continue;
         }
 
         found = object_resolve_partial_path(prop->opaque, parts,
                                             typename, ambiguous);
         if (found) {
             if (obj) {
                 *ambiguous = true;
                 return NULL;
             }
             obj = found;
         }
 
         if (*ambiguous) {
             return NULL;
         }
     }
 
     return obj;
 }
 
 Object *object_resolve_path_type(const char *path, const char *typename,
                                  bool *ambiguousp)
 {
     Object *obj;
     char **parts;
 
     parts = g_strsplit(path, "/", 0);
     assert(parts);
 
     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
         bool ambiguous = false;
         obj = object_resolve_partial_path(object_get_root(), parts,
                                           typename, &ambiguous);
         if (ambiguousp) {
             *ambiguousp = ambiguous;
         }
     } else {
         obj = object_resolve_abs_path(object_get_root(), parts + 1, typename);
     }
 
     g_strfreev(parts);
 
     return obj;
 }
 
 Object *object_resolve_path(const char *path, bool *ambiguous)
 {
     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
 }
 
 Object *object_resolve_path_at(Object *parent, const char *path)
 {
     g_auto(GStrv) parts = g_strsplit(path, "/", 0);
 
     if (*path == '/') {
         return object_resolve_abs_path(object_get_root(), parts + 1,
                                        TYPE_OBJECT);
     }
     return object_resolve_abs_path(parent, parts, TYPE_OBJECT);
 }
 
 typedef struct StringProperty
 {
     char *(*get)(Object *, Error **);
     void (*set)(Object *, const char *, Error **);
 } StringProperty;
 
 static void property_get_str(Object *obj, Visitor *v, const char *name,
                              void *opaque, Error **errp)
 {
     StringProperty *prop = opaque;
     char *value;
     Error *err = NULL;
 
     value = prop->get(obj, &err);
     if (err) {
         error_propagate(errp, err);
         return;
     }
 
     visit_type_str(v, name, &value, errp);
     g_free(value);
 }
 
 static void property_set_str(Object *obj, Visitor *v, const char *name,
                              void *opaque, Error **errp)
 {
     StringProperty *prop = opaque;
     char *value;
 
     if (!visit_type_str(v, name, &value, errp)) {
         return;
     }
 
     prop->set(obj, value, errp);
     g_free(value);
 }
 
 static void property_release_data(Object *obj, const char *name,
                                   void *opaque)
 {
     g_free(opaque);
 }
 
 ObjectProperty *
 object_property_add_str(Object *obj, const char *name,
                         char *(*get)(Object *, Error **),
                         void (*set)(Object *, const char *, Error **))
 {
     StringProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
     prop->set = set;
 
     return object_property_add(obj, name, "string",
                                get ? property_get_str : NULL,
                                set ? property_set_str : NULL,
                                property_release_data,
                                prop);
 }
 
 ObjectProperty *
 object_class_property_add_str(ObjectClass *klass, const char *name,
                                    char *(*get)(Object *, Error **),
                                    void (*set)(Object *, const char *,
                                                Error **))
 {
     StringProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
     prop->set = set;
 
     return object_class_property_add(klass, name, "string",
                                      get ? property_get_str : NULL,
                                      set ? property_set_str : NULL,
                                      NULL,
                                      prop);
 }
 
 typedef struct BoolProperty
 {
     bool (*get)(Object *, Error **);
     void (*set)(Object *, bool, Error **);
 } BoolProperty;
 
 static void property_get_bool(Object *obj, Visitor *v, const char *name,
                               void *opaque, Error **errp)
 {
     BoolProperty *prop = opaque;
     bool value;
     Error *err = NULL;
 
     value = prop->get(obj, &err);
     if (err) {
         error_propagate(errp, err);
         return;
     }
 
     visit_type_bool(v, name, &value, errp);
 }
 
 static void property_set_bool(Object *obj, Visitor *v, const char *name,
                               void *opaque, Error **errp)
 {
     BoolProperty *prop = opaque;
     bool value;
 
     if (!visit_type_bool(v, name, &value, errp)) {
         return;
     }
 
     prop->set(obj, value, errp);
 }
 
 ObjectProperty *
 object_property_add_bool(Object *obj, const char *name,
                          bool (*get)(Object *, Error **),
                          void (*set)(Object *, bool, Error **))
 {
     BoolProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
     prop->set = set;
 
     return object_property_add(obj, name, "bool",
                                get ? property_get_bool : NULL,
                                set ? property_set_bool : NULL,
                                property_release_data,
                                prop);
 }
 
 ObjectProperty *
 object_class_property_add_bool(ObjectClass *klass, const char *name,
                                     bool (*get)(Object *, Error **),
                                     void (*set)(Object *, bool, Error **))
 {
     BoolProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
     prop->set = set;
 
     return object_class_property_add(klass, name, "bool",
                                      get ? property_get_bool : NULL,
                                      set ? property_set_bool : NULL,
                                      NULL,
                                      prop);
 }
 
 static void property_get_enum(Object *obj, Visitor *v, const char *name,
                               void *opaque, Error **errp)
 {
     EnumProperty *prop = opaque;
     int value;
     Error *err = NULL;
 
     value = prop->get(obj, &err);
     if (err) {
         error_propagate(errp, err);
         return;
     }
 
     visit_type_enum(v, name, &value, prop->lookup, errp);
 }
 
 static void property_set_enum(Object *obj, Visitor *v, const char *name,
                               void *opaque, Error **errp)
 {
     EnumProperty *prop = opaque;
     int value;
 
     if (!visit_type_enum(v, name, &value, prop->lookup, errp)) {
         return;
     }
     prop->set(obj, value, errp);
 }
 
 ObjectProperty *
 object_property_add_enum(Object *obj, const char *name,
                          const char *typename,
                          const QEnumLookup *lookup,
                          int (*get)(Object *, Error **),
                          void (*set)(Object *, int, Error **))
 {
     EnumProperty *prop = g_malloc(sizeof(*prop));
 
     prop->lookup = lookup;
     prop->get = get;
     prop->set = set;
 
     return object_property_add(obj, name, typename,
                                get ? property_get_enum : NULL,
                                set ? property_set_enum : NULL,
                                property_release_data,
                                prop);
 }
 
 ObjectProperty *
 object_class_property_add_enum(ObjectClass *klass, const char *name,
                                     const char *typename,
                                     const QEnumLookup *lookup,
                                     int (*get)(Object *, Error **),
                                     void (*set)(Object *, int, Error **))
 {
     EnumProperty *prop = g_malloc(sizeof(*prop));
 
     prop->lookup = lookup;
     prop->get = get;
     prop->set = set;
 
     return object_class_property_add(klass, name, typename,
                                      get ? property_get_enum : NULL,
                                      set ? property_set_enum : NULL,
                                      NULL,
                                      prop);
 }
 
 typedef struct TMProperty {
     void (*get)(Object *, struct tm *, Error **);
 } TMProperty;
 
 static void property_get_tm(Object *obj, Visitor *v, const char *name,
                             void *opaque, Error **errp)
 {
     TMProperty *prop = opaque;
     Error *err = NULL;
     struct tm value;
 
     prop->get(obj, &value, &err);
     if (err) {
         error_propagate(errp, err);
         return;
     }
 
     if (!visit_start_struct(v, name, NULL, 0, errp)) {
         return;
     }
     if (!visit_type_int32(v, "tm_year", &value.tm_year, errp)) {
         goto out_end;
     }
     if (!visit_type_int32(v, "tm_mon", &value.tm_mon, errp)) {
         goto out_end;
     }
     if (!visit_type_int32(v, "tm_mday", &value.tm_mday, errp)) {
         goto out_end;
     }
     if (!visit_type_int32(v, "tm_hour", &value.tm_hour, errp)) {
         goto out_end;
     }
     if (!visit_type_int32(v, "tm_min", &value.tm_min, errp)) {
         goto out_end;
     }
     if (!visit_type_int32(v, "tm_sec", &value.tm_sec, errp)) {
         goto out_end;
     }
     visit_check_struct(v, errp);
 out_end:
     visit_end_struct(v, NULL);
 }
 
 ObjectProperty *
 object_property_add_tm(Object *obj, const char *name,
                        void (*get)(Object *, struct tm *, Error **))
 {
     TMProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
 
     return object_property_add(obj, name, "struct tm",
                                get ? property_get_tm : NULL, NULL,
                                property_release_data,
                                prop);
 }
 
 ObjectProperty *
 object_class_property_add_tm(ObjectClass *klass, const char *name,
                              void (*get)(Object *, struct tm *, Error **))
 {
     TMProperty *prop = g_malloc0(sizeof(*prop));
 
     prop->get = get;
 
     return object_class_property_add(klass, name, "struct tm",
                                      get ? property_get_tm : NULL,
                                      NULL, NULL, prop);
 }
 
 static char *object_get_type(Object *obj, Error **errp)
 {
     return g_strdup(object_get_typename(obj));
 }
 
 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
                                    void *opaque, Error **errp)
 {
     uint8_t value = *(uint8_t *)opaque;
     visit_type_uint8(v, name, &value, errp);
 }
 
 static void property_set_uint8_ptr(Object *obj, Visitor *v, const char *name,
                                    void *opaque, Error **errp)
 {
     uint8_t *field = opaque;
     uint8_t value;
 
     if (!visit_type_uint8(v, name, &value, errp)) {
         return;
     }
 
     *field = value;
 }
 
 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     uint16_t value = *(uint16_t *)opaque;
     visit_type_uint16(v, name, &value, errp);
 }
 
 static void property_set_uint16_ptr(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     uint16_t *field = opaque;
     uint16_t value;
 
     if (!visit_type_uint16(v, name, &value, errp)) {
         return;
     }
 
     *field = value;
 }
 
 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     uint32_t value = *(uint32_t *)opaque;
     visit_type_uint32(v, name, &value, errp);
 }
 
 static void property_set_uint32_ptr(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     uint32_t *field = opaque;
     uint32_t value;
 
     if (!visit_type_uint32(v, name, &value, errp)) {
         return;
     }
 
     *field = value;
 }
 
 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     uint64_t value = *(uint64_t *)opaque;
     visit_type_uint64(v, name, &value, errp);
 }
 
 static void property_set_uint64_ptr(Object *obj, Visitor *v, const char *name,
                                     void *opaque, Error **errp)
 {
     uint64_t *field = opaque;
     uint64_t value;
 
     if (!visit_type_uint64(v, name, &value, errp)) {
         return;
     }
 
     *field = value;
 }
 
 ObjectProperty *
 object_property_add_uint8_ptr(Object *obj, const char *name,
                               const uint8_t *v,
                               ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint8_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint8_ptr;
     }
 
     return object_property_add(obj, name, "uint8",
                                getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
                                     const uint8_t *v,
                                     ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint8_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint8_ptr;
     }
 
     return object_class_property_add(klass, name, "uint8",
                                      getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_property_add_uint16_ptr(Object *obj, const char *name,
                                const uint16_t *v,
                                ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint16_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint16_ptr;
     }
 
     return object_property_add(obj, name, "uint16",
                                getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
                                      const uint16_t *v,
                                      ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint16_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint16_ptr;
     }
 
     return object_class_property_add(klass, name, "uint16",
                                      getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_property_add_uint32_ptr(Object *obj, const char *name,
                                const uint32_t *v,
                                ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint32_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint32_ptr;
     }
 
     return object_property_add(obj, name, "uint32",
                                getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
                                      const uint32_t *v,
                                      ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint32_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint32_ptr;
     }
 
     return object_class_property_add(klass, name, "uint32",
                                      getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_property_add_uint64_ptr(Object *obj, const char *name,
                                const uint64_t *v,
                                ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint64_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint64_ptr;
     }
 
     return object_property_add(obj, name, "uint64",
                                getter, setter, NULL, (void *)v);
 }
 
 ObjectProperty *
 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
                                      const uint64_t *v,
                                      ObjectPropertyFlags flags)
 {
     ObjectPropertyAccessor *getter = NULL;
     ObjectPropertyAccessor *setter = NULL;
 
     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
         getter = property_get_uint64_ptr;
     }
 
     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
         setter = property_set_uint64_ptr;
     }
 
     return object_class_property_add(klass, name, "uint64",
                                      getter, setter, NULL, (void *)v);
 }
 
 typedef struct {
     Object *target_obj;
     char *target_name;
 } AliasProperty;
 
 static void property_get_alias(Object *obj, Visitor *v, const char *name,
                                void *opaque, Error **errp)
 {
     AliasProperty *prop = opaque;
     Visitor *alias_v = visitor_forward_field(v, prop->target_name, name);
 
     object_property_get(prop->target_obj, prop->target_name, alias_v, errp);
     visit_free(alias_v);
 }
 
 static void property_set_alias(Object *obj, Visitor *v, const char *name,
                                void *opaque, Error **errp)
 {
     AliasProperty *prop = opaque;
     Visitor *alias_v = visitor_forward_field(v, prop->target_name, name);
 
     object_property_set(prop->target_obj, prop->target_name, alias_v, errp);
     visit_free(alias_v);
 }
 
 static Object *property_resolve_alias(Object *obj, void *opaque,
                                       const char *part)
 {
     AliasProperty *prop = opaque;
 
     return object_resolve_path_component(prop->target_obj, prop->target_name);
 }
 
 static void property_release_alias(Object *obj, const char *name, void *opaque)
 {
     AliasProperty *prop = opaque;
 
     g_free(prop->target_name);
     g_free(prop);
 }
 
 ObjectProperty *
 object_property_add_alias(Object *obj, const char *name,
                           Object *target_obj, const char *target_name)
 {
     AliasProperty *prop;
     ObjectProperty *op;
     ObjectProperty *target_prop;
     g_autofree char *prop_type = NULL;
 
     target_prop = object_property_find_err(target_obj, target_name,
                                            &error_abort);
 
     if (object_property_is_child(target_prop)) {
         prop_type = g_strdup_printf("link%s",
                                     target_prop->type + strlen("child"));
     } else {
         prop_type = g_strdup(target_prop->type);
     }
 
     prop = g_malloc(sizeof(*prop));
     prop->target_obj = target_obj;
     prop->target_name = g_strdup(target_name);
 
     op = object_property_add(obj, name, prop_type,
                              property_get_alias,
                              property_set_alias,
                              property_release_alias,
                              prop);
     op->resolve = property_resolve_alias;
     if (target_prop->defval) {
         op->defval = qobject_ref(target_prop->defval);
     }
 
     object_property_set_description(obj, op->name,
                                     target_prop->description);
     return op;
 }
 
 void object_property_set_description(Object *obj, const char *name,
                                      const char *description)
 {
     ObjectProperty *op;
 
     op = object_property_find_err(obj, name, &error_abort);
     g_free(op->description);
     op->description = g_strdup(description);
 }
 
 void object_class_property_set_description(ObjectClass *klass,
                                            const char *name,
                                            const char *description)
 {
     ObjectProperty *op;
 
     op = g_hash_table_lookup(klass->properties, name);
     g_free(op->description);
     op->description = g_strdup(description);
 }
 
 static void object_class_init(ObjectClass *klass, void *data)
 {
     object_class_property_add_str(klass, "type", object_get_type,
                                   NULL);
 }
 
 static void register_types(void)
 {
     static const TypeInfo interface_info = {
         .name = TYPE_INTERFACE,
         .class_size = sizeof(InterfaceClass),
         .abstract = true,
     };
 
     static const TypeInfo object_info = {
         .name = TYPE_OBJECT,
         .instance_size = sizeof(Object),
         .class_init = object_class_init,
         .abstract = true,
     };
 
     type_interface = type_register_internal(&interface_info);
     type_register_internal(&object_info);
 }
 
 type_init(register_types)