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[Qemu-devel] [PATCH 2/5] qom: add object_property_add_alias()
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 2/5] qom: add object_property_add_alias() |
Date: |
Wed, 11 Jun 2014 18:49:26 +0200 |
From: Stefan Hajnoczi <address@hidden>
Sometimes an object needs to present a property which is actually on
another object, or it needs to provide an alias name for an existing
property.
Examples:
a.foo -> b.foo
a.old_name -> a.new_name
The new object_property_add_alias() API allows objects to alias a
property on the same object or another object. The source and target
names can be different.
Signed-off-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Peter Crosthwaite <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
include/qom/object.h | 20 +++++++++++++++++
qom/object.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 81 insertions(+)
diff --git a/include/qom/object.h b/include/qom/object.h
index f8ab845..9c4a5a4 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -1252,6 +1252,26 @@ void object_property_add_uint64_ptr(Object *obj, const
char *name,
const uint64_t *v, Error **Errp);
/**
+ * object_property_add_alias:
+ * @obj: the object to add a property to
+ * @name: the name of the property
+ * @target_obj: the object to forward property access to
+ * @target_name: the name of the property on the forwarded object
+ * @errp: if an error occurs, a pointer to an area to store the error
+ *
+ * Add an alias for a property on an object. This function will add a property
+ * of the same type as the forwarded property.
+ *
+ * The caller must ensure that <code>@target_obj</code> stays alive as long as
+ * this property exists. In the case of a child object or an alias on the same
+ * object this will be the case. For aliases to other objects the caller is
+ * responsible for taking a reference.
+ */
+void object_property_add_alias(Object *obj, const char *name,
+ Object *target_obj, const char *target_name,
+ Error **errp);
+
+/**
* object_child_foreach:
* @obj: the object whose children will be navigated
* @fn: the iterator function to be called
diff --git a/qom/object.c b/qom/object.c
index fcdd0da..e146ae5 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -1532,6 +1532,67 @@ void object_property_add_uint64_ptr(Object *obj, const
char *name,
NULL, NULL, (void *)v, errp);
}
+typedef struct
+{
+ Object *target_obj;
+ const char *target_name;
+} AliasProperty;
+
+static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
+ const char *name, Error **errp)
+{
+ AliasProperty *prop = opaque;
+
+ object_property_get(prop->target_obj, v, prop->target_name, errp);
+}
+
+static void property_set_alias(Object *obj, struct Visitor *v, void *opaque,
+ const char *name, 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);
+}
+
+void object_property_add_alias(Object *obj, const char *name,
+ Object *target_obj, const char *target_name,
+ Error **errp)
+{
+ AliasProperty *prop;
+ ObjectProperty *target_prop;
+
+ target_prop = object_property_find(target_obj, target_name, errp);
+ if (!target_prop) {
+ return;
+ }
+
+ prop = g_malloc(sizeof(*prop));
+ prop->target_obj = target_obj;
+ prop->target_name = target_name;
+
+ object_property_add_full(obj, name, target_prop->type,
+ property_get_alias,
+ property_set_alias,
+ property_resolve_alias,
+ property_release_alias,
+ prop, errp);
+}
+
static void object_instance_init(Object *obj)
{
object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
--
1.8.3.1
[Qemu-devel] [PATCH 3/5] qom: allow creating an alias of a child<> property, Paolo Bonzini, 2014/06/11