forked from AbleOS/holey-bytes
89 lines
2.4 KiB
Rust
89 lines
2.4 KiB
Rust
//! HoleyBytes register value definition
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use crate::utils::static_assert;
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/// Define [`Value`] »union« (it's fake)
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///
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/// # Safety
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/// Its 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),* $(,)?) => {
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/// HBVM register value
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#[derive(Copy, Clone)]
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#[repr(transparent)]
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pub struct Value(pub u64);
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$(
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impl From<$ty> for Value {
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#[inline]
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fn from(value: $ty) -> Self {
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let mut new = core::mem::MaybeUninit::<u64>::zeroed();
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unsafe {
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new.as_mut_ptr().cast::<$ty>().write(value);
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Self(new.assume_init())
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}
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}
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}
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static_assert!(core::mem::size_of::<$ty>() <= core::mem::size_of::<Value>());
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impl private::Sealed for $ty {}
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unsafe impl ValueVariant for $ty {}
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)*
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};
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}
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impl Value {
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/// Byte reinterpret value to target variant
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#[inline]
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pub fn cast<V: ValueVariant>(self) -> V {
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unsafe { core::mem::transmute_copy(&self.0) }
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}
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}
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/// # Safety
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/// - N/A, not to be implemented manually
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pub unsafe trait ValueVariant: private::Sealed + Copy + Into<Value> {}
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impl private::Sealed for Value {}
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unsafe impl ValueVariant for Value {}
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mod private {
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pub trait Sealed {}
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}
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value_def!(u8, u16, u32, u64, i8, i16, i32, i64, f32, f64);
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static_assert!(core::mem::size_of::<Value>() == 8);
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impl core::fmt::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.cast::<u64>())
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}
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}
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pub(crate) trait CheckedDivRem {
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fn checked_div(self, other: Self) -> Option<Self>
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where
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Self: Sized;
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fn checked_rem(self, other: Self) -> Option<Self>
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where
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Self: Sized;
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}
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macro_rules! impl_checked_div_rem {
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($($ty:ty),* $(,)?) => {
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$(impl CheckedDivRem for $ty {
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#[inline(always)]
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fn checked_div(self, another: Self) -> Option<Self>
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{ self.checked_div(another) }
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#[inline(always)]
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fn checked_rem(self, another: Self) -> Option<Self>
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{ self.checked_rem(another) }
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})*
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};
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}
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impl_checked_div_rem!(u8, u16, u32, u64, i8, i16, i32, i64);
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