When there are many instances of a given class, registering properties against the instance is wasteful of resources. The majority of objects have a statically defined list of possible properties, so most of the properties are easily registerable against the class. Only those properties which are conditionally registered at runtime need be recorded against the klass.
Registering properties against classes also makes it possible to provide static introspection of QOM - currently introspection is only possible after creating an instance of a class, which severely limits its usefulness. This impl only supports simple scalar properties. It does not attempt to allow child object / link object properties against the class. There are ways to support those too, but it would make this patch more complicated, so it is left as an exercise for the future. There is no equivalent to object_property_del provided, since classes must be immutable once they are defined. Signed-off-by: Daniel P. Berrange <berra...@redhat.com> --- Changed in v2: - Clarify in commit message that prop deletion is intentionally not provided against classes - Remove automatic expansion of "[*]" property names, leaving it to the caller todo this if desired. include/qom/object.h | 44 +++++++++++ qom/object.c | 212 +++++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 249 insertions(+), 7 deletions(-) diff --git a/include/qom/object.h b/include/qom/object.h index be7280c..d177158 100644 --- a/include/qom/object.h +++ b/include/qom/object.h @@ -383,6 +383,8 @@ struct ObjectClass const char *class_cast_cache[OBJECT_CLASS_CAST_CACHE]; ObjectUnparent *unparent; + + QTAILQ_HEAD(, ObjectProperty) properties; }; /** @@ -949,6 +951,13 @@ ObjectProperty *object_property_add(Object *obj, const char *name, void object_property_del(Object *obj, const char *name, Error **errp); +ObjectProperty *object_class_property_add(ObjectClass *klass, const char *name, + const char *type, + ObjectPropertyAccessor *get, + ObjectPropertyAccessor *set, + ObjectPropertyRelease *release, + void *opaque, Error **errp); + /** * object_property_find: * @obj: the object @@ -959,6 +968,8 @@ void object_property_del(Object *obj, const char *name, Error **errp); */ ObjectProperty *object_property_find(Object *obj, const char *name, Error **errp); +ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name, + Error **errp); void object_unparent(Object *obj); @@ -1327,6 +1338,12 @@ void object_property_add_str(Object *obj, const char *name, void (*set)(Object *, const char *, Error **), Error **errp); +void object_class_property_add_str(ObjectClass *klass, const char *name, + char *(*get)(Object *, Error **), + void (*set)(Object *, const char *, + Error **), + Error **errp); + /** * object_property_add_bool: * @obj: the object to add a property to @@ -1343,6 +1360,11 @@ void object_property_add_bool(Object *obj, const char *name, void (*set)(Object *, bool, Error **), Error **errp); +void object_class_property_add_bool(ObjectClass *klass, const char *name, + bool (*get)(Object *, Error **), + void (*set)(Object *, bool, Error **), + Error **errp); + /** * object_property_add_enum: * @obj: the object to add a property to @@ -1362,6 +1384,13 @@ void object_property_add_enum(Object *obj, const char *name, void (*set)(Object *, int, Error **), Error **errp); +void object_class_property_add_enum(ObjectClass *klass, const char *name, + const char *typename, + const char * const *strings, + int (*get)(Object *, Error **), + void (*set)(Object *, int, Error **), + Error **errp); + /** * object_property_add_tm: * @obj: the object to add a property to @@ -1376,6 +1405,10 @@ void object_property_add_tm(Object *obj, const char *name, void (*get)(Object *, struct tm *, Error **), Error **errp); +void object_class_property_add_tm(ObjectClass *klass, const char *name, + void (*get)(Object *, struct tm *, Error **), + Error **errp); + /** * object_property_add_uint8_ptr: * @obj: the object to add a property to @@ -1388,6 +1421,8 @@ void object_property_add_tm(Object *obj, const char *name, */ void object_property_add_uint8_ptr(Object *obj, const char *name, const uint8_t *v, Error **errp); +void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name, + const uint8_t *v, Error **errp); /** * object_property_add_uint16_ptr: @@ -1401,6 +1436,8 @@ void object_property_add_uint8_ptr(Object *obj, const char *name, */ void object_property_add_uint16_ptr(Object *obj, const char *name, const uint16_t *v, Error **errp); +void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name, + const uint16_t *v, Error **errp); /** * object_property_add_uint32_ptr: @@ -1414,6 +1451,8 @@ void object_property_add_uint16_ptr(Object *obj, const char *name, */ void object_property_add_uint32_ptr(Object *obj, const char *name, const uint32_t *v, Error **errp); +void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name, + const uint32_t *v, Error **errp); /** * object_property_add_uint64_ptr: @@ -1427,6 +1466,8 @@ void object_property_add_uint32_ptr(Object *obj, const char *name, */ void object_property_add_uint64_ptr(Object *obj, const char *name, const uint64_t *v, Error **Errp); +void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name, + const uint64_t *v, Error **Errp); /** * object_property_add_alias: @@ -1478,6 +1519,9 @@ void object_property_add_const_link(Object *obj, const char *name, */ void object_property_set_description(Object *obj, const char *name, const char *description, Error **errp); +void object_class_property_set_description(ObjectClass *klass, const char *name, + const char *description, + Error **errp); /** * object_child_foreach: diff --git a/qom/object.c b/qom/object.c index 4805328..d76deea 100644 --- a/qom/object.c +++ b/qom/object.c @@ -264,6 +264,7 @@ static void type_initialize(TypeImpl *ti) g_assert(parent->class_size <= ti->class_size); memcpy(ti->class, parent->class, parent->class_size); ti->class->interfaces = NULL; + QTAILQ_INIT(&ti->class->properties); for (e = parent->class->interfaces; e; e = e->next) { InterfaceClass *iface = e->data; @@ -288,6 +289,8 @@ static void type_initialize(TypeImpl *ti) type_initialize_interface(ti, t, t); } + } else { + QTAILQ_INIT(&ti->class->properties); } ti->class->type = ti; @@ -879,13 +882,12 @@ object_property_add(Object *obj, const char *name, const char *type, return ret; } - QTAILQ_FOREACH(prop, &obj->properties, node) { - if (strcmp(prop->name, name) == 0) { - error_setg(errp, "attempt to add duplicate property '%s'" - " to object (type '%s')", name, - object_get_typename(obj)); - return NULL; - } + + 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)); @@ -902,10 +904,49 @@ object_property_add(Object *obj, const char *name, const char *type, 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; + + QTAILQ_INSERT_TAIL(&klass->properties, prop, node); + 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; + } QTAILQ_FOREACH(prop, &obj->properties, node) { if (strcmp(prop->name, name) == 0) { @@ -917,6 +958,30 @@ ObjectProperty *object_property_find(Object *obj, const char *name, return NULL; } +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; + } + } + + QTAILQ_FOREACH(prop, &klass->properties, node) { + if (strcmp(prop->name, name) == 0) { + return prop; + } + } + + error_setg(errp, "Property '.%s' not found", name); + return NULL; +} + void object_property_del(Object *obj, const char *name, Error **errp) { ObjectProperty *prop = object_property_find(obj, name, errp); @@ -1670,6 +1735,29 @@ void object_property_add_str(Object *obj, const char *name, } } +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 **); @@ -1737,6 +1825,28 @@ void object_property_add_bool(Object *obj, const char *name, } } +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, void *opaque, const char *name, Error **errp) { @@ -1800,6 +1910,31 @@ void object_property_add_enum(Object *obj, const char *name, } } +void object_class_property_add_enum(ObjectClass *klass, const char *name, + const char *typename, + const char * const *strings, + int (*get)(Object *, Error **), + void (*set)(Object *, int, Error **), + Error **errp) +{ + Error *local_err = NULL; + EnumProperty *prop = g_malloc(sizeof(*prop)); + + prop->strings = strings; + 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; @@ -1879,6 +2014,25 @@ void object_property_add_tm(Object *obj, const char *name, } } +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)); @@ -1923,6 +2077,13 @@ void object_property_add_uint8_ptr(Object *obj, const char *name, 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) { @@ -1930,6 +2091,13 @@ void object_property_add_uint16_ptr(Object *obj, const char *name, 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) { @@ -1937,6 +2105,13 @@ void object_property_add_uint32_ptr(Object *obj, const char *name, 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) { @@ -1944,6 +2119,13 @@ void object_property_add_uint64_ptr(Object *obj, const char *name, 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; @@ -2041,6 +2223,22 @@ void object_property_set_description(Object *obj, const char *name, op->description = g_strdup(description); } +void object_class_property_set_description(ObjectClass *klass, + const char *name, + const char *description, + Error **errp) +{ + ObjectProperty *op; + + op = object_class_property_find(klass, name, errp); + if (!op) { + return; + } + + g_free(op->description); + op->description = g_strdup(description); +} + static void object_instance_init(Object *obj) { object_property_add_str(obj, "type", qdev_get_type, NULL, NULL); -- 2.4.3