forked from AbleOS/holey-bytes
49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
//! HoleyBytes register value definition
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use core::fmt::Debug;
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/// Define [`Value`] union
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///
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/// # Safety
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/// Union variants have to be sound to byte-reinterpretate
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/// between each other. Otherwise the behaviour is undefined.
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macro_rules! value_def {
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($($ty:ident),* $(,)?) => {
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/// HBVM register value
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#[derive(Copy, Clone)]
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#[repr(packed)]
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pub union Value {
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$(pub $ty: $ty),*
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}
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paste::paste! {
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impl Value {$(
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#[doc = "Byte-reinterpret [`Value`] as [`" $ty "`]"]
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#[inline]
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pub fn [<as_ $ty>](&self) -> $ty {
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unsafe { self.$ty }
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}
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)*}
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}
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$(
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impl From<$ty> for Value {
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#[inline]
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fn from(value: $ty) -> Self {
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Self { $ty: value }
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}
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}
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)*
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};
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}
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value_def!(u64, i64, f64);
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static_assertions::const_assert_eq!(core::mem::size_of::<Value>(), 8);
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impl Debug for Value {
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fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
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// Print formatted as hexadecimal, unsigned integer
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write!(f, "{:x}", self.as_u64())
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}
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}
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