From 0210b39d0e84d5a63a3e468f177c07a3a98d88a8 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Mon, 16 Jul 2018 14:59:18 +0200 Subject: [PATCH] qom/object: Add a new function object_initialize_child() A lot of code is using the object_initialize() function followed by a call to object_property_add_child() to add the newly initialized object as a child of the current object. Both functions increase the reference counter of the new object, but many spots that call these two functions then forget to drop one of the superfluous references. So the newly created object is often not cleaned up correctly when the parent is destroyed. In the worst case, this can cause crashes, e.g. because device objects are not correctly removed from their parent_bus. Since this is a common pattern between many code spots, let's introduce a new function that takes care of calling all three required initialization functions, first object_initialize(), then object_property_add_child() and finally object_unref(). And since the function does a similar job like object_new_with_props(), also allow to set additional properties via varargs, and use user_creatable_complete() to make sure that the functions can be used similarly. And while we're at object.h, also fix some copy-n-paste errors in the comments there ("to store the area" --> "to store the error"). Signed-off-by: Thomas Huth Reviewed-by: Eduardo Habkost Message-id: 1531745974-17187-2-git-send-email-thuth@redhat.com Signed-off-by: Peter Maydell --- include/qom/object.h | 45 ++++++++++++++++++++++++++++++++++-- qom/object.c | 54 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 97 insertions(+), 2 deletions(-) diff --git a/include/qom/object.h b/include/qom/object.h index f3d2308d56..f0b0bf39cc 100644 --- a/include/qom/object.h +++ b/include/qom/object.h @@ -748,6 +748,47 @@ int object_set_propv(Object *obj, */ void object_initialize(void *obj, size_t size, const char *typename); +/** + * object_initialize_child: + * @parentobj: The parent object to add a property to + * @propname: The name of the property + * @childobj: A pointer to the memory to be used for the object. + * @size: The maximum size available at @childobj for the object. + * @type: The name of the type of the object to instantiate. + * @errp: If an error occurs, a pointer to an area to store the error + * @...: list of property names and values + * + * This function will initialize an object. The memory for the object should + * have already been allocated. The object will then be added as child property + * to a parent with object_property_add_child() function. The returned object + * has a reference count of 1 (for the "child<...>" property from the parent), + * so the object will be finalized automatically when the parent gets removed. + * + * The variadic parameters are a list of pairs of (propname, propvalue) + * strings. The propname of %NULL indicates the end of the property list. + * If the object implements the user creatable interface, the object will + * be marked complete once all the properties have been processed. + */ +void object_initialize_child(Object *parentobj, const char *propname, + void *childobj, size_t size, const char *type, + Error **errp, ...) QEMU_SENTINEL; + +/** + * object_initialize_childv: + * @parentobj: The parent object to add a property to + * @propname: The name of the property + * @childobj: A pointer to the memory to be used for the object. + * @size: The maximum size available at @childobj for the object. + * @type: The name of the type of the object to instantiate. + * @errp: If an error occurs, a pointer to an area to store the error + * @vargs: list of property names and values + * + * See object_initialize_child() for documentation. + */ +void object_initialize_childv(Object *parentobj, const char *propname, + void *childobj, size_t size, const char *type, + Error **errp, va_list vargs); + /** * object_dynamic_cast: * @obj: The object to cast. @@ -1382,7 +1423,7 @@ Object *object_resolve_path_component(Object *parent, const gchar *part); * @obj: the object to add a property to * @name: the name of the property * @child: the child object - * @errp: if an error occurs, a pointer to an area to store the area + * @errp: if an error occurs, a pointer to an area to store the error * * Child properties form the composition tree. All objects need to be a child * of another object. Objects can only be a child of one object. @@ -1420,7 +1461,7 @@ void object_property_allow_set_link(const Object *, const char *, * @child: a pointer to where the link object reference is stored * @check: callback to veto setting or NULL if the property is read-only * @flags: additional options for the link - * @errp: if an error occurs, a pointer to an area to store the area + * @errp: if an error occurs, a pointer to an area to store the error * * Links establish relationships between objects. Links are unidirectional * although two links can be combined to form a bidirectional relationship diff --git a/qom/object.c b/qom/object.c index 4609e34a6a..75d1d48944 100644 --- a/qom/object.c +++ b/qom/object.c @@ -392,6 +392,60 @@ void object_initialize(void *data, size_t size, const char *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; + + 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; + } + + if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) { + user_creatable_complete(obj, &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);