rust: clean up define_property macro

Use the "struct update" syntax to initialize most of the fields to zero,
and simplify the handmade type-checking of $name.

Reviewed-by: Junjie Mao <junjie.mao@hotmail.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/rust/qemu-api/src/device_class.rs b/rust/qemu-api/src/device_class.rs
index 2219b9f73d0f8fbc6c416b8ffd3a6afcb662ee48..aab604840963f3b60b421b052003cfc6fe1f4dac 100644 (file)
--- a/rust/qemu-api/src/device_class.rs
+++ b/rust/qemu-api/src/device_class.rs
@@ -29,44 +29,27 @@ macro_rules! device_class_init {
 macro_rules! define_property {
     ($name:expr, $state:ty, $field:expr, $prop:expr, $type:expr, default = $defval:expr$(,)*) => {
         $crate::bindings::Property {
-            name: {
-                #[used]
-                static _TEMP: &::core::ffi::CStr = $name;
-                _TEMP.as_ptr()
-            },
+            // use associated function syntax for type checking
+            name: ::core::ffi::CStr::as_ptr($name),
             info: $prop,
             offset: ::core::mem::offset_of!($state, $field)
                 .try_into()
                 .expect("Could not fit offset value to type"),
-            bitnr: 0,
-            bitmask: 0,
             set_default: true,
-            defval: $crate::bindings::Property__bindgen_ty_1 { u: $defval.into() },
-            arrayoffset: 0,
-            arrayinfo: ::core::ptr::null(),
-            arrayfieldsize: 0,
-            link_type: ::core::ptr::null(),
+            defval: $crate::bindings::Property__bindgen_ty_1 { u: $defval as u64 },
+            ..unsafe { ::core::mem::MaybeUninit::<$crate::bindings::Property>::zeroed().assume_init() }
         }
     };
     ($name:expr, $state:ty, $field:expr, $prop:expr, $type:expr$(,)*) => {
         $crate::bindings::Property {
-            name: {
-                #[used]
-                static _TEMP: &::core::ffi::CStr = $name;
-                _TEMP.as_ptr()
-            },
+            // use associated function syntax for type checking
+            name: ::core::ffi::CStr::as_ptr($name),
             info: $prop,
             offset: ::core::mem::offset_of!($state, $field)
                 .try_into()
                 .expect("Could not fit offset value to type"),
-            bitnr: 0,
-            bitmask: 0,
             set_default: false,
-            defval: $crate::bindings::Property__bindgen_ty_1 { i: 0 },
-            arrayoffset: 0,
-            arrayinfo: ::core::ptr::null(),
-            arrayfieldsize: 0,
-            link_type: ::core::ptr::null(),
+            ..unsafe { ::core::mem::MaybeUninit::<$crate::bindings::Property>::zeroed().assume_init() }
         }
     };
 }