/* * 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 "qapi/error.h" #include "qom/object.h" #include "qom/object_interfaces.h" #include "qemu/cutils.h" #include "qapi/visitor.h" #include "qapi/string-input-visitor.h" #include "qapi/string-output-visitor.h" #include "qapi/qapi-builtin-visit.h" #include "qapi/qmp/qerror.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" #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; 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->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); g_assert(type->parent_type != NULL); } 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, iface_impl->class); } static void object_property_free(gpointer data) { ObjectProperty *prop = data; 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); memcpy(ti->class, parent->class, parent->class_size); ti->class->interfaces = NULL; ti->class->properties = g_hash_table_new_full( g_str_hash, g_str_equal, g_free, object_property_free); 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); 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); } } else { ti->class->properties = g_hash_table_new_full( g_str_hash, g_str_equal, g_free, 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)); } } void object_apply_global_props(Object *obj, const GPtrArray *props, Error **errp) { int i; if (!props) { return; } 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, NULL)) { continue; } p->used = true; object_property_parse(obj, p->value, p->property, &err); if (err != NULL) { 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; } else { warn_report_err(err); } } } } /* * Global property defaults * Slot 0: accelerator's global property defaults * Slot 1: machine's global property defaults * Each is a GPtrArray of of GlobalProperty. * Applied in order, later entries override earlier ones. */ static GPtrArray *object_compat_props[2]; /* * 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], &error_abort); } } static void object_initialize_with_type(void *data, size_t size, TypeImpl *type) { Object *obj = data; g_assert(type != NULL); 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); 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); object_initialize_with_type(data, size, type); } void object_initialize_child(Object *parentobj, const char *propname, void *childobj, size_t size, const char *type, Error **errp, ...) { va_list vargs; va_start(vargs, errp); object_initialize_childv(parentobj, propname, childobj, size, type, errp, vargs); va_end(vargs); } void object_initialize_childv(Object *parentobj, const char *propname, void *childobj, size_t size, const char *type, Error **errp, va_list vargs) { Error *local_err = NULL; Object *obj; UserCreatable *uc; object_initialize(childobj, size, type); obj = OBJECT(childobj); object_set_propv(obj, &local_err, vargs); if (local_err) { goto out; } object_property_add_child(parentobj, propname, obj, &local_err); if (local_err) { goto out; } uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE); if (uc) { user_creatable_complete(uc, &local_err); if (local_err) { object_unparent(obj); goto out; } } /* * Since object_property_add_child added a reference to the child object, * we can drop the reference added by object_initialize(), so the child * property will own the only reference to the object. */ object_unref(obj); out: if (local_err) { error_propagate(errp, local_err); object_unref(obj); } } static inline bool object_property_is_child(ObjectProperty *prop) { return strstart(prop->type, "child<", NULL); } static void object_property_del_all(Object *obj) { ObjectProperty *prop; GHashTableIter iter; gpointer key, value; bool released; do { released = false; g_hash_table_iter_init(&iter, obj->properties); while (g_hash_table_iter_next(&iter, &key, &value)) { prop = value; if (prop->release) { prop->release(obj, prop->name, prop->opaque); prop->release = NULL; released = true; break; } g_hash_table_iter_remove(&iter); } } while (released); g_hash_table_unref(obj->properties); } static void object_property_del_child(Object *obj, Object *child, Error **errp) { 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, NULL); } } 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); if (obj->free) { obj->free(obj); } } static Object *object_new_with_type(Type type) { Object *obj; g_assert(type != NULL); type_initialize(type); obj = g_malloc(type->instance_size); object_initialize_with_type(obj, type->instance_size, type); obj->free = g_free; return obj; } 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; Error *local_err = NULL; 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, &local_err, vargs) < 0) { goto error; } if (id != NULL) { object_property_add_child(parent, id, obj, &local_err); if (local_err) { goto error; } } uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE); if (uc) { user_creatable_complete(uc, &local_err); if (local_err) { if (id != NULL) { object_unparent(obj); } goto error; } } object_unref(OBJECT(obj)); return obj; error: error_propagate(errp, local_err); object_unref(obj); return NULL; } int object_set_props(Object *obj, Error **errp, ...) { va_list vargs; int ret; va_start(vargs, errp); ret = object_set_propv(obj, errp, vargs); va_end(vargs); return ret; } int object_set_propv(Object *obj, Error **errp, va_list vargs) { const char *propname; Error *local_err = NULL; propname = va_arg(vargs, char *); while (propname != NULL) { const char *value = va_arg(vargs, char *); g_assert(value != NULL); object_property_parse(obj, value, propname, &local_err); if (local_err) { error_propagate(errp, local_err); return -1; } propname = va_arg(vargs, char *); } return 0; } 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 (atomic_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++) { atomic_set(&obj->class->object_cast_cache[i - 1], atomic_read(&obj->class->object_cast_cache[i])); } atomic_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 (atomic_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++) { atomic_set(&class->class_cast_cache[i - 1], atomic_read(&class->class_cast_cache[i])); } atomic_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 *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) { do_object_child_foreach(child, fn, opaque, true); } } } 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); } void object_ref(Object *obj) { if (!obj) { return; } atomic_inc(&obj->ref); } void object_unref(Object *obj) { if (!obj) { return; } g_assert(obj->ref > 0); /* parent always holds a reference to its children */ if (atomic_fetch_dec(&obj->ref) == 1) { object_finalize(obj); } } ObjectProperty * object_property_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; char *name_no_array = g_strdup(name); name_no_array[name_len - 3] = '\0'; for (i = 0; ; ++i) { char *full_name = g_strdup_printf("%s[%d]", name_no_array, i); ret = object_property_add(obj, full_name, type, get, set, release, opaque, NULL); g_free(full_name); if (ret) { break; } } g_free(name_no_array); return ret; } if (object_property_find(obj, name, NULL) != 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_class_property_add(ObjectClass *klass, const char *name, const char *type, ObjectPropertyAccessor *get, ObjectPropertyAccessor *set, ObjectPropertyRelease *release, void *opaque, Error **errp) { ObjectProperty *prop; if (object_class_property_find(klass, name, NULL) != NULL) { error_setg(errp, "attempt to add duplicate property '%s'" " to object (type '%s')", name, object_class_get_name(klass)); 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(klass->properties, g_strdup(name), prop); return prop; } ObjectProperty *object_property_find(Object *obj, const char *name, Error **errp) { ObjectProperty *prop; ObjectClass *klass = object_get_class(obj); prop = object_class_property_find(klass, name, NULL); if (prop) { return prop; } prop = g_hash_table_lookup(obj->properties, name); if (prop) { return prop; } error_setg(errp, "Property '.%s' not found", name); return NULL; } 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, Error **errp) { ObjectProperty *prop; ObjectClass *parent_klass; parent_klass = object_class_get_parent(klass); if (parent_klass) { prop = object_class_property_find(parent_klass, name, NULL); if (prop) { return prop; } } prop = g_hash_table_lookup(klass->properties, name); if (!prop) { error_setg(errp, "Property '.%s' not found", name); } return prop; } void object_property_del(Object *obj, const char *name, Error **errp) { ObjectProperty *prop = g_hash_table_lookup(obj->properties, name); if (!prop) { error_setg(errp, "Property '.%s' not found", name); return; } if (prop->release) { prop->release(obj, name, prop->opaque); } g_hash_table_remove(obj->properties, name); } void object_property_get(Object *obj, Visitor *v, const char *name, Error **errp) { ObjectProperty *prop = object_property_find(obj, name, errp); if (prop == NULL) { return; } if (!prop->get) { error_setg(errp, QERR_PERMISSION_DENIED); } else { prop->get(obj, v, name, prop->opaque, errp); } } void object_property_set(Object *obj, Visitor *v, const char *name, Error **errp) { ObjectProperty *prop = object_property_find(obj, name, errp); if (prop == NULL) { return; } if (!prop->set) { error_setg(errp, QERR_PERMISSION_DENIED); } else { prop->set(obj, v, name, prop->opaque, errp); } } void object_property_set_str(Object *obj, const char *value, const char *name, Error **errp) { QString *qstr = qstring_from_str(value); object_property_set_qobject(obj, QOBJECT(qstr), name, errp); qobject_unref(qstr); } char *object_property_get_str(Object *obj, const char *name, Error **errp) { QObject *ret = object_property_get_qobject(obj, name, errp); char *retval; if (!ret) { return NULL; } retval = g_strdup(qobject_get_try_str(ret)); if (!retval) { error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string"); } qobject_unref(ret); return retval; } void object_property_set_link(Object *obj, Object *value, const char *name, Error **errp) { if (value) { gchar *path = object_get_canonical_path(value); object_property_set_str(obj, path, name, errp); g_free(path); } else { object_property_set_str(obj, "", name, 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; } void object_property_set_bool(Object *obj, bool value, const char *name, Error **errp) { QBool *qbool = qbool_from_bool(value); object_property_set_qobject(obj, QOBJECT(qbool), name, errp); qobject_unref(qbool); } 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; } void object_property_set_int(Object *obj, int64_t value, const char *name, Error **errp) { QNum *qnum = qnum_from_int(value); object_property_set_qobject(obj, QOBJECT(qnum), name, errp); qobject_unref(qnum); } 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; } void object_property_set_uint(Object *obj, uint64_t value, const char *name, Error **errp) { QNum *qnum = qnum_from_uint(value); object_property_set_qobject(obj, QOBJECT(qnum), name, errp); qobject_unref(qnum); } 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) { Error *err = NULL; Visitor *v; char *str; int ret; ObjectProperty *prop = object_property_find(obj, name, errp); EnumProperty *enumprop; if (prop == NULL) { return 0; } 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 0; } enumprop = prop->opaque; v = string_output_visitor_new(false, &str); object_property_get(obj, v, name, &err); if (err) { error_propagate(errp, err); visit_free(v); return 0; } visit_complete(v, &str); visit_free(v); v = string_input_visitor_new(str); visit_type_enum(v, name, &ret, enumprop->lookup, errp); g_free(str); visit_free(v); return ret; } void object_property_get_uint16List(Object *obj, const char *name, uint16List **list, Error **errp) { Error *err = NULL; Visitor *v; char *str; v = string_output_visitor_new(false, &str); object_property_get(obj, v, name, &err); if (err) { error_propagate(errp, err); goto out; } visit_complete(v, &str); visit_free(v); v = string_input_visitor_new(str); visit_type_uint16List(v, NULL, list, errp); g_free(str); out: visit_free(v); } void object_property_parse(Object *obj, const char *string, const char *name, Error **errp) { Visitor *v = string_input_visitor_new(string); object_property_set(obj, v, name, errp); visit_free(v); } char *object_property_print(Object *obj, const char *name, bool human, Error **errp) { Visitor *v; char *string = NULL; Error *local_err = NULL; v = string_output_visitor_new(human, &string); object_property_get(obj, v, name, &local_err); if (local_err) { error_propagate(errp, local_err); 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(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; gchar *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 gchar *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); } void object_property_add_child(Object *obj, const char *name, Object *child, Error **errp) { Error *local_err = NULL; gchar *type; ObjectProperty *op; if (child->parent != NULL) { error_setg(errp, "child object is already parented"); return; } type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child))); op = object_property_add(obj, name, type, object_get_child_property, NULL, object_finalize_child_property, child, &local_err); if (local_err) { error_propagate(errp, local_err); goto out; } op->resolve = object_resolve_child_property; object_ref(child); child->parent = obj; out: g_free(type); } 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 { Object **child; void (*check)(const Object *, const char *, Object *, Error **); ObjectPropertyLinkFlags flags; } LinkProperty; static void object_get_link_property(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { LinkProperty *lprop = opaque; Object **child = lprop->child; gchar *path; if (*child) { path = object_get_canonical_path(*child); visit_type_str(v, name, &path, errp); g_free(path); } else { path = (gchar *)""; 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; gchar *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 **child = prop->child; Object *old_target = *child; Object *new_target = NULL; char *path = NULL; visit_type_str(v, name, &path, &local_err); if (!local_err && strcmp(path, "") != 0) { new_target = object_resolve_link(obj, name, path, &local_err); } g_free(path); if (local_err) { error_propagate(errp, local_err); return; } prop->check(obj, name, new_target, &local_err); if (local_err) { error_propagate(errp, local_err); return; } *child = 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 gchar *part) { LinkProperty *lprop = opaque; return *lprop->child; } static void object_release_link_property(Object *obj, const char *name, void *opaque) { LinkProperty *prop = opaque; if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) { object_unref(*prop->child); } g_free(prop); } void object_property_add_link(Object *obj, const char *name, const char *type, Object **child, void (*check)(const Object *, const char *, Object *, Error **), ObjectPropertyLinkFlags flags, Error **errp) { Error *local_err = NULL; LinkProperty *prop = g_malloc(sizeof(*prop)); gchar *full_type; ObjectProperty *op; prop->child = child; 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, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); goto out; } op->resolve = object_resolve_link_property; out: g_free(full_type); } void object_property_add_const_link(Object *obj, const char *name, Object *target, Error **errp) { char *link_type; ObjectProperty *op; link_type = g_strdup_printf("link<%s>", object_get_typename(target)); op = object_property_add(obj, name, link_type, object_get_child_property, NULL, NULL, target, errp); if (op != NULL) { op->resolve = object_resolve_child_property; } g_free(link_type); } gchar *object_get_canonical_path_component(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 g_strdup(prop->name); } } /* obj had a parent but was not a child, should never happen */ g_assert_not_reached(); return NULL; } gchar *object_get_canonical_path(Object *obj) { Object *root = object_get_root(); char *newpath, *path = NULL; if (obj == root) { return g_strdup("/"); } do { 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); g_free(component); path = newpath; obj = obj->parent; } while (obj != root); return path; } Object *object_resolve_path_component(Object *parent, const gchar *part) { ObjectProperty *prop = object_property_find(parent, part, NULL); 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, gchar **parts, const char *typename, int index) { Object *child; if (parts[index] == NULL) { return object_dynamic_cast(parent, typename); } if (strcmp(parts[index], "") == 0) { return object_resolve_abs_path(parent, parts, typename, index + 1); } child = object_resolve_path_component(parent, parts[index]); if (!child) { return NULL; } return object_resolve_abs_path(child, parts, typename, index + 1); } static Object *object_resolve_partial_path(Object *parent, gchar **parts, const char *typename, bool *ambiguous) { Object *obj; GHashTableIter iter; ObjectProperty *prop; obj = object_resolve_abs_path(parent, parts, typename, 0); 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; gchar **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, typename, 1); } g_strfreev(parts); return obj; } Object *object_resolve_path(const char *path, bool *ambiguous) { return object_resolve_path_type(path, TYPE_OBJECT, ambiguous); } 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; Error *local_err = NULL; visit_type_str(v, name, &value, &local_err); if (local_err) { error_propagate(errp, local_err); return; } prop->set(obj, value, errp); g_free(value); } static void property_release_str(Object *obj, const char *name, void *opaque) { StringProperty *prop = opaque; g_free(prop); } void object_property_add_str(Object *obj, const char *name, char *(*get)(Object *, Error **), void (*set)(Object *, const char *, Error **), Error **errp) { Error *local_err = NULL; StringProperty *prop = g_malloc0(sizeof(*prop)); prop->get = get; prop->set = set; object_property_add(obj, name, "string", get ? property_get_str : NULL, set ? property_set_str : NULL, property_release_str, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); } } void object_class_property_add_str(ObjectClass *klass, const char *name, char *(*get)(Object *, Error **), void (*set)(Object *, const char *, Error **), Error **errp) { Error *local_err = NULL; StringProperty *prop = g_malloc0(sizeof(*prop)); prop->get = get; prop->set = set; object_class_property_add(klass, name, "string", get ? property_get_str : NULL, set ? property_set_str : NULL, property_release_str, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(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; Error *local_err = NULL; visit_type_bool(v, name, &value, &local_err); if (local_err) { error_propagate(errp, local_err); return; } prop->set(obj, value, errp); } static void property_release_bool(Object *obj, const char *name, void *opaque) { BoolProperty *prop = opaque; g_free(prop); } void object_property_add_bool(Object *obj, const char *name, bool (*get)(Object *, Error **), void (*set)(Object *, bool, Error **), Error **errp) { Error *local_err = NULL; BoolProperty *prop = g_malloc0(sizeof(*prop)); prop->get = get; prop->set = set; object_property_add(obj, name, "bool", get ? property_get_bool : NULL, set ? property_set_bool : NULL, property_release_bool, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); } } void object_class_property_add_bool(ObjectClass *klass, const char *name, bool (*get)(Object *, Error **), void (*set)(Object *, bool, Error **), Error **errp) { Error *local_err = NULL; BoolProperty *prop = g_malloc0(sizeof(*prop)); prop->get = get; prop->set = set; object_class_property_add(klass, name, "bool", get ? property_get_bool : NULL, set ? property_set_bool : NULL, property_release_bool, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(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; Error *err = NULL; visit_type_enum(v, name, &value, prop->lookup, &err); if (err) { error_propagate(errp, err); return; } prop->set(obj, value, errp); } static void property_release_enum(Object *obj, const char *name, void *opaque) { EnumProperty *prop = opaque; g_free(prop); } void object_property_add_enum(Object *obj, const char *name, const char *typename, const QEnumLookup *lookup, int (*get)(Object *, Error **), void (*set)(Object *, int, Error **), Error **errp) { Error *local_err = NULL; EnumProperty *prop = g_malloc(sizeof(*prop)); prop->lookup = lookup; prop->get = get; prop->set = set; object_property_add(obj, name, typename, get ? property_get_enum : NULL, set ? property_set_enum : NULL, property_release_enum, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); } } void 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 **), Error **errp) { Error *local_err = NULL; EnumProperty *prop = g_malloc(sizeof(*prop)); prop->lookup = lookup; prop->get = get; prop->set = set; object_class_property_add(klass, name, typename, get ? property_get_enum : NULL, set ? property_set_enum : NULL, property_release_enum, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(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) { goto out; } visit_start_struct(v, name, NULL, 0, &err); if (err) { goto out; } visit_type_int32(v, "tm_year", &value.tm_year, &err); if (err) { goto out_end; } visit_type_int32(v, "tm_mon", &value.tm_mon, &err); if (err) { goto out_end; } visit_type_int32(v, "tm_mday", &value.tm_mday, &err); if (err) { goto out_end; } visit_type_int32(v, "tm_hour", &value.tm_hour, &err); if (err) { goto out_end; } visit_type_int32(v, "tm_min", &value.tm_min, &err); if (err) { goto out_end; } visit_type_int32(v, "tm_sec", &value.tm_sec, &err); if (err) { goto out_end; } visit_check_struct(v, &err); out_end: visit_end_struct(v, NULL); out: error_propagate(errp, err); } static void property_release_tm(Object *obj, const char *name, void *opaque) { TMProperty *prop = opaque; g_free(prop); } void object_property_add_tm(Object *obj, const char *name, void (*get)(Object *, struct tm *, Error **), Error **errp) { Error *local_err = NULL; TMProperty *prop = g_malloc0(sizeof(*prop)); prop->get = get; object_property_add(obj, name, "struct tm", get ? property_get_tm : NULL, NULL, property_release_tm, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); } } void object_class_property_add_tm(ObjectClass *klass, const char *name, void (*get)(Object *, struct tm *, Error **), Error **errp) { Error *local_err = NULL; TMProperty *prop = g_malloc0(sizeof(*prop)); prop->get = get; object_class_property_add(klass, name, "struct tm", get ? property_get_tm : NULL, NULL, property_release_tm, prop, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); } } static char *qdev_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_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_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_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); } void object_property_add_uint8_ptr(Object *obj, const char *name, const uint8_t *v, Error **errp) { object_property_add(obj, name, "uint8", property_get_uint8_ptr, NULL, NULL, (void *)v, errp); } void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name, const uint8_t *v, Error **errp) { object_class_property_add(klass, name, "uint8", property_get_uint8_ptr, NULL, NULL, (void *)v, errp); } void object_property_add_uint16_ptr(Object *obj, const char *name, const uint16_t *v, Error **errp) { object_property_add(obj, name, "uint16", property_get_uint16_ptr, NULL, NULL, (void *)v, errp); } void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name, const uint16_t *v, Error **errp) { object_class_property_add(klass, name, "uint16", property_get_uint16_ptr, NULL, NULL, (void *)v, errp); } void object_property_add_uint32_ptr(Object *obj, const char *name, const uint32_t *v, Error **errp) { object_property_add(obj, name, "uint32", property_get_uint32_ptr, NULL, NULL, (void *)v, errp); } void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name, const uint32_t *v, Error **errp) { object_class_property_add(klass, name, "uint32", property_get_uint32_ptr, NULL, NULL, (void *)v, errp); } void object_property_add_uint64_ptr(Object *obj, const char *name, const uint64_t *v, Error **errp) { object_property_add(obj, name, "uint64", property_get_uint64_ptr, NULL, NULL, (void *)v, errp); } void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name, const uint64_t *v, Error **errp) { object_class_property_add(klass, name, "uint64", property_get_uint64_ptr, NULL, NULL, (void *)v, errp); } 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; object_property_get(prop->target_obj, v, prop->target_name, errp); } static void property_set_alias(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { AliasProperty *prop = opaque; object_property_set(prop->target_obj, v, prop->target_name, errp); } static Object *property_resolve_alias(Object *obj, void *opaque, const gchar *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); } void object_property_add_alias(Object *obj, const char *name, Object *target_obj, const char *target_name, Error **errp) { AliasProperty *prop; ObjectProperty *op; ObjectProperty *target_prop; gchar *prop_type; Error *local_err = NULL; target_prop = object_property_find(target_obj, target_name, errp); if (!target_prop) { return; } 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, &local_err); if (local_err) { error_propagate(errp, local_err); g_free(prop); goto out; } op->resolve = property_resolve_alias; object_property_set_description(obj, op->name, target_prop->description, &error_abort); out: g_free(prop_type); } void object_property_set_description(Object *obj, const char *name, const char *description, Error **errp) { ObjectProperty *op; op = object_property_find(obj, name, errp); if (!op) { return; } g_free(op->description); op->description = g_strdup(description); } void object_class_property_set_description(ObjectClass *klass, const char *name, const char *description, Error **errp) { ObjectProperty *op; op = g_hash_table_lookup(klass->properties, name); if (!op) { error_setg(errp, "Property '.%s' not found", name); return; } 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", qdev_get_type, NULL, &error_abort); } static void register_types(void) { static TypeInfo interface_info = { .name = TYPE_INTERFACE, .class_size = sizeof(InterfaceClass), .abstract = true, }; static 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)