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[Qemu-devel] [PATCH v4 7/7] qom: allow properties to be registered again


From: Daniel P. Berrange
Subject: [Qemu-devel] [PATCH v4 7/7] qom: allow properties to be registered against classes
Date: Tue, 13 Oct 2015 13:37:46 +0100

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 <address@hidden>
---
 include/qom/object.h       |  50 ++++++++++
 qom/object.c               | 237 ++++++++++++++++++++++++++++++++++++++++++---
 tests/check-qom-proplist.c |  31 ++++--
 3 files changed, 293 insertions(+), 25 deletions(-)

diff --git a/include/qom/object.h b/include/qom/object.h
index 2a54515..38f41d3 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;
 };
 
 /**
@@ -947,6 +949,13 @@ 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
@@ -957,6 +966,8 @@ 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;
 
@@ -964,8 +975,14 @@ typedef struct ObjectPropertyIterator 
ObjectPropertyIterator;
  * object_property_iter_init:
  * @obj: the object
  *
+<<<<<<< HEAD
  * Initializes an iterator for traversing all properties
  * registered against an object instance.
+=======
+ * Iterates over all properties defined against the object
+ * instance, its class and all parent classes, calling
+ * @iter for each property.
+>>>>>>> 0ca9307... qom: allow properties to be registered against classes
  *
  * It is forbidden to modify the property list while iterating,
  * whether removing or adding properties.
@@ -1375,6 +1392,12 @@ 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
@@ -1391,6 +1414,11 @@ 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
@@ -1410,6 +1438,13 @@ 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
@@ -1424,6 +1459,10 @@ 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
@@ -1436,6 +1475,8 @@ 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:
@@ -1449,6 +1490,8 @@ 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:
@@ -1462,6 +1505,8 @@ 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:
@@ -1475,6 +1520,8 @@ 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:
@@ -1526,6 +1573,9 @@ 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 dd01652..f41edf4 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 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(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, 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, property_free);
     }
 
     ti->class->type = ti;
@@ -330,16 +346,6 @@ static void object_post_init_with_type(Object *obj, 
TypeImpl *ti)
     }
 }
 
-static void 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;
@@ -902,10 +908,11 @@ object_property_add(Object *obj, const char *name, const 
char *type,
         return ret;
     }
 
-    if (g_hash_table_contains(obj->properties, name)) {
+
+    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;
     }
 
@@ -923,10 +930,50 @@ 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) {
@@ -941,6 +988,7 @@ 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;
 }
 
@@ -957,12 +1005,37 @@ 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)
 {
@@ -1717,6 +1790,29 @@ 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 **);
@@ -1784,6 +1880,28 @@ 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)
 {
@@ -1847,6 +1965,31 @@ 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;
@@ -1926,6 +2069,25 @@ 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));
@@ -1970,6 +2132,13 @@ 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)
 {
@@ -1977,6 +2146,13 @@ 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)
 {
@@ -1984,6 +2160,13 @@ 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)
 {
@@ -1991,6 +2174,13 @@ 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;
@@ -2088,6 +2278,23 @@ 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 1be8b9e..87de80b 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,
 };
 
 static void test_dummy_createv(void)
-- 
2.4.3




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