From 0fcccf3ff04a54d597bffcb7a42668c52a7dcec0 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 17 Jan 2025 12:00:01 +0100 Subject: rust: qom: add reference counting functionality Add a smart pointer that allows to add and remove references from QOM objects. It's important to note that while all QOM objects have a reference count, in practice not all of them have their lifetime guarded by it. Embedded objects, specifically, are confined to the lifetime of the owner. When writing Rust bindings this is important, because embedded objects are *never* used through the "Owned<>" smart pointer that is introduced here. Reviewed-by: Zhao Liu Signed-off-by: Paolo Bonzini --- rust/qemu-api/tests/tests.rs | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'rust/qemu-api/tests') diff --git a/rust/qemu-api/tests/tests.rs b/rust/qemu-api/tests/tests.rs index 5c3e75e..5f6096a 100644 --- a/rust/qemu-api/tests/tests.rs +++ b/rust/qemu-api/tests/tests.rs @@ -15,7 +15,7 @@ use qemu_api::{ declare_properties, define_property, prelude::*, qdev::{DeviceClass, DeviceImpl, DeviceState, Property}, - qom::{ClassInitImpl, ObjectImpl, ParentField}, + qom::{ClassInitImpl, ObjectImpl, Owned, ParentField}, vmstate::VMStateDescription, zeroable::Zeroable, }; @@ -139,6 +139,17 @@ fn test_object_new() { } #[test] +#[allow(clippy::redundant_clone)] +/// Create, clone and then drop an instance. +fn test_clone() { + init_qom(); + let p: *mut DummyState = unsafe { object_new(DummyState::TYPE_NAME.as_ptr()).cast() }; + let p = unsafe { Owned::from_raw(p) }; + assert_eq!(p.clone().typename(), "dummy"); + drop(p); +} + +#[test] /// Try invoking a method on an object. fn test_typename() { init_qom(); -- cgit v1.1