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qom: Add class_base_init

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The class_base_init TypeInfo callback was present in one of the early
QOM versions but removed (on my request...) before committing.  We
will need it soon, add it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Paolo Bonzini 2012-05-02 13:30:55 +02:00 committed by Andreas Färber
parent 32efc535b8
commit 3b50e311b4
2 changed files with 17 additions and 2 deletions
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10
include/qemu/object.h
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@ -291,10 +291,15 @@ struct Object
* has occurred to allow a class to set its default virtual method pointers.
* This is also the function to use to override virtual methods from a parent
* class.
* @class_base_init: This function is called for all base classes after all
* parent class initialization has occurred, but before the class itself
* is initialized. This is the function to use to undo the effects of
* memcpy from the parent class to the descendents.
* @class_finalize: This function is called during class destruction and is
* meant to release and dynamic parameters allocated by @class_init.
* @class_data: Data to pass to the @class_init and @class_finalize functions.
* This can be useful when building dynamic classes.
* @class_data: Data to pass to the @class_init, @class_base_init and
* @class_finalize functions. This can be useful when building dynamic
* classes.
* @interfaces: The list of interfaces associated with this type. This
* should point to a static array that's terminated with a zero filled
* element.
@ -312,6 +317,7 @@ struct TypeInfo
size_t class_size;
void (*class_init)(ObjectClass *klass, void *data);
void (*class_base_init)(ObjectClass *klass, void *data);
void (*class_finalize)(ObjectClass *klass, void *data);
void *class_data;

9
qom/object.c
View file

@ -45,6 +45,7 @@ struct TypeImpl
size_t instance_size;
void (*class_init)(ObjectClass *klass, void *data);
void (*class_base_init)(ObjectClass *klass, void *data);
void (*class_finalize)(ObjectClass *klass, void *data);
void *class_data;
@ -112,6 +113,7 @@ TypeImpl *type_register(const TypeInfo *info)
ti->instance_size = info->instance_size;
ti->class_init = info->class_init;
ti->class_base_init = info->class_base_init;
ti->class_finalize = info->class_finalize;
ti->class_data = info->class_data;
@ -232,6 +234,13 @@ static void type_initialize(TypeImpl *ti)
memcpy((void *)ti->class + sizeof(ObjectClass),
(void *)parent->class + sizeof(ObjectClass),
parent->class_size - sizeof(ObjectClass));
while (parent) {
if (parent->class_base_init) {
parent->class_base_init(ti->class, ti->class_data);
}
parent = type_get_parent(parent);
}
}
memset((void *)ti->class + class_size, 0, ti->class_size - class_size);