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rust: qom: add object creation functionality

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The basic object lifecycle test can now be implemented using safe code!

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-10-31 14:27:36 +01:00
parent 0fcccf3ff0
commit ec3eba9896
4 changed files with 48 additions and 34 deletions
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1
rust/qemu-api/src/prelude.rs
View file

@ -12,6 +12,7 @@ pub use crate::qom::Object;
pub use crate::qom::ObjectCast;
pub use crate::qom::ObjectCastMut;
pub use crate::qom::ObjectDeref;
pub use crate::qom::ObjectClassMethods;
pub use crate::qom::ObjectMethods;
pub use crate::qom::ObjectType;

23
rust/qemu-api/src/qom.rs
View file

@ -66,8 +66,8 @@ pub use bindings::{Object, ObjectClass};
use crate::{
bindings::{
self, object_dynamic_cast, object_get_class, object_get_typename, object_ref, object_unref,
TypeInfo,
self, object_dynamic_cast, object_get_class, object_get_typename, object_new, object_ref,
object_unref, TypeInfo,
},
cell::bql_locked,
};
@ -759,6 +759,24 @@ impl<T: IsA<Object>> fmt::Debug for Owned<T> {
}
}
/// Trait for class methods exposed by the Object class. The methods can be
/// called on all objects that have the trait `IsA<Object>`.
///
/// The trait should only be used through the blanket implementation,
/// which guarantees safety via `IsA`
pub trait ObjectClassMethods: IsA<Object> {
/// Return a new reference counted instance of this class
fn new() -> Owned<Self> {
assert!(bql_locked());
// SAFETY: the object created by object_new is allocated on
// the heap and has a reference count of 1
unsafe {
let obj = &*object_new(Self::TYPE_NAME.as_ptr());
Owned::from_raw(obj.unsafe_cast::<Self>())
}
}
}
/// Trait for methods exposed by the Object class. The methods can be
/// called on all objects that have the trait `IsA<Object>`.
///
@ -799,4 +817,5 @@ where
}
}
impl<T> ObjectClassMethods for T where T: IsA<Object> {}
impl<R: ObjectDeref> ObjectMethods for R where R::Target: IsA<Object> {}