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authorDaniel P. Berrange <berrange@redhat.com>2015-10-13 13:37:46 +0100
committerAndreas Färber <afaerber@suse.de>2016-01-18 17:47:58 +0100
commit16bf7f522a2ff68993f80631ed86254c71eaf5d4 (patch)
tree2cbfc341f1ac60e39bf7b54727a187c469b3fab2
parent46188349ad7e23abef0e453d2b0406985f6552a1 (diff)
qom: Allow properties to be registered against classes
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 <berrange@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
-rw-r--r--include/qom/object.h46
-rw-r--r--qom/object.c236
-rw-r--r--tests/check-qom-proplist.c31
3 files changed, 287 insertions, 26 deletions
diff --git a/include/qom/object.h b/include/qom/object.h
index 4509166f6f..37d414a6bf 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -381,6 +381,8 @@ struct ObjectClass
const char *class_cast_cache[OBJECT_CLASS_CAST_CACHE];
ObjectUnparent *unparent;
+
+ GHashTable *properties;
};
/**
@@ -944,6 +946,13 @@ 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
@@ -954,6 +963,8 @@ 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);
typedef struct ObjectPropertyIterator ObjectPropertyIterator;
@@ -962,7 +973,7 @@ typedef struct ObjectPropertyIterator ObjectPropertyIterator;
* @obj: the object
*
* Initializes an iterator for traversing all properties
- * registered against an object instance.
+ * registered against an object instance, its class and all parent classes.
*
* It is forbidden to modify the property list while iterating,
* whether removing or adding properties.
@@ -1371,6 +1382,12 @@ 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
@@ -1387,6 +1404,11 @@ 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
@@ -1406,6 +1428,13 @@ 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
@@ -1420,6 +1449,10 @@ 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
@@ -1432,6 +1465,8 @@ 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:
@@ -1445,6 +1480,8 @@ 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:
@@ -1458,6 +1495,8 @@ 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:
@@ -1471,6 +1510,8 @@ 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:
@@ -1522,6 +1563,9 @@ 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 d7515697a3..5d4c80b102 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -68,6 +68,7 @@ struct TypeImpl
};
struct ObjectPropertyIterator {
+ ObjectClass *nextclass;
GHashTableIter iter;
};
@@ -246,6 +247,16 @@ static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
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;
@@ -268,6 +279,8 @@ static void type_initialize(TypeImpl *ti)
g_assert_cmpint(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;
@@ -292,6 +305,9 @@ static void type_initialize(TypeImpl *ti)
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;
@@ -330,16 +346,6 @@ static void object_post_init_with_type(Object *obj, TypeImpl *ti)
}
}
-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);
-}
-
void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
{
Object *obj = data;
@@ -918,10 +924,10 @@ object_property_add(Object *obj, const char *name, const char *type,
return ret;
}
- if (g_hash_table_lookup(obj->properties, name) != 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));
+ " to object (type '%s')", name,
+ object_get_typename(obj));
return NULL;
}
@@ -939,10 +945,50 @@ 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;
+
+ 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) {
@@ -957,6 +1003,7 @@ ObjectPropertyIterator *object_property_iter_init(Object *obj)
{
ObjectPropertyIterator *ret = g_new0(ObjectPropertyIterator, 1);
g_hash_table_iter_init(&ret->iter, obj->properties);
+ ret->nextclass = object_get_class(obj);
return ret;
}
@@ -971,12 +1018,37 @@ void object_property_iter_free(ObjectPropertyIterator *iter)
ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
{
gpointer key, val;
- if (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
- return NULL;
+ 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;
}
+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);
@@ -1730,6 +1802,29 @@ 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 **);
@@ -1797,6 +1892,28 @@ 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)
{
@@ -1860,6 +1977,31 @@ 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;
@@ -1939,6 +2081,25 @@ 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));
@@ -1983,6 +2144,13 @@ 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)
{
@@ -1990,6 +2158,13 @@ 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)
{
@@ -1997,6 +2172,13 @@ 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)
{
@@ -2004,6 +2186,13 @@ 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;
@@ -2101,6 +2290,23 @@ 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 = 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_instance_init(Object *obj)
{
object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
diff --git a/tests/check-qom-proplist.c b/tests/check-qom-proplist.c
index e674c0fa89..5167e78e93 100644
--- a/tests/check-qom-proplist.c
+++ b/tests/check-qom-proplist.c
@@ -123,18 +123,28 @@ static void dummy_init(Object *obj)
dummy_get_bv,
dummy_set_bv,
NULL);
- object_property_add_str(obj, "sv",
- dummy_get_sv,
- dummy_set_sv,
- NULL);
- object_property_add_enum(obj, "av",
- "DummyAnimal",
- dummy_animal_map,
- dummy_get_av,
- dummy_set_av,
- NULL);
}
+
+static void dummy_class_init(ObjectClass *cls, void *data)
+{
+ object_class_property_add_bool(cls, "bv",
+ dummy_get_bv,
+ dummy_set_bv,
+ NULL);
+ object_class_property_add_str(cls, "sv",
+ dummy_get_sv,
+ dummy_set_sv,
+ NULL);
+ object_class_property_add_enum(cls, "av",
+ "DummyAnimal",
+ dummy_animal_map,
+ dummy_get_av,
+ dummy_set_av,
+ NULL);
+}
+
+
static void dummy_finalize(Object *obj)
{
DummyObject *dobj = DUMMY_OBJECT(obj);
@@ -150,6 +160,7 @@ static const TypeInfo dummy_info = {
.instance_init = dummy_init,
.instance_finalize = dummy_finalize,
.class_size = sizeof(DummyObjectClass),
+ .class_init = dummy_class_init,
};