diff options
Diffstat (limited to 'rust/qemu-api/src')
| -rw-r--r-- | rust/qemu-api/src/vmstate.rs | 52 |
1 files changed, 51 insertions, 1 deletions
diff --git a/rust/qemu-api/src/vmstate.rs b/rust/qemu-api/src/vmstate.rs index 01f06ed737..9740931fb1 100644 --- a/rust/qemu-api/src/vmstate.rs +++ b/rust/qemu-api/src/vmstate.rs @@ -25,9 +25,12 @@ //! functionality that is missing from `vmstate_of!`. use core::{marker::PhantomData, mem, ptr::NonNull}; +use std::os::raw::{c_int, c_void}; pub use crate::bindings::{VMStateDescription, VMStateField}; -use crate::{bindings::VMStateFlags, prelude::*, qom::Owned, zeroable::Zeroable}; +use crate::{ + bindings::VMStateFlags, callbacks::FnCall, prelude::*, qom::Owned, zeroable::Zeroable, +}; /// This macro is used to call a function with a generic argument bound /// to the type of a field. The function must take a @@ -508,6 +511,53 @@ macro_rules! vmstate_fields { }} } +pub extern "C" fn rust_vms_test_field_exists<T, F: for<'a> FnCall<(&'a T, u8), bool>>( + opaque: *mut c_void, + version_id: c_int, +) -> bool { + let owner: &T = unsafe { &*(opaque.cast::<T>()) }; + let version: u8 = version_id.try_into().unwrap(); + // SAFETY: the opaque was passed as a reference to `T`. + F::call((owner, version)) +} + +pub type VMSFieldExistCb = unsafe extern "C" fn( + opaque: *mut std::os::raw::c_void, + version_id: std::os::raw::c_int, +) -> bool; + +#[doc(alias = "VMSTATE_VALIDATE")] +#[macro_export] +macro_rules! vmstate_validate { + ($struct_name:ty, $test_name:expr, $test_fn:expr $(,)?) => { + $crate::bindings::VMStateField { + name: ::std::ffi::CStr::as_ptr($test_name), + field_exists: { + const fn test_cb_builder__< + T, + F: for<'a> $crate::callbacks::FnCall<(&'a T, u8), bool>, + >( + _phantom: ::core::marker::PhantomData<F>, + ) -> $crate::vmstate::VMSFieldExistCb { + let _: () = F::ASSERT_IS_SOME; + $crate::vmstate::rust_vms_test_field_exists::<T, F> + } + + const fn phantom__<T>(_: &T) -> ::core::marker::PhantomData<T> { + ::core::marker::PhantomData + } + Some(test_cb_builder__::<$struct_name, _>(phantom__(&$test_fn))) + }, + flags: $crate::bindings::VMStateFlags( + $crate::bindings::VMStateFlags::VMS_MUST_EXIST.0 + | $crate::bindings::VMStateFlags::VMS_ARRAY.0, + ), + num: 0, // 0 elements: no data, only run test_fn callback + ..$crate::zeroable::Zeroable::ZERO + } + }; +} + /// A transparent wrapper type for the `subsections` field of /// [`VMStateDescription`]. /// |