109 lines
2.5 KiB
Rust
109 lines
2.5 KiB
Rust
|
//! Virtual(?) memory address
|
||
|
|
|
||
|
|
use {
|
||
|
|
core::{fmt::Debug, ops},
|
||
|
|
derive_more::Display,
|
||
|
|
};
|
||
|
|
|
||
|
|
/// Memory address
|
||
|
|
#[derive(Clone, Copy, Display, PartialEq, Eq, PartialOrd, Ord)]
|
||
|
|
#[display(fmt = "{_0:x}")]
|
||
|
|
pub struct Address(u64);
|
||
|
|
impl Address {
|
||
|
|
/// A null address
|
||
|
|
pub const NULL: Self = Self(0);
|
||
|
|
|
||
|
|
/// Saturating integer addition. Computes self + rhs, saturating at the numeric bounds instead of overflowing.
|
||
|
|
#[inline]
|
||
|
|
pub fn saturating_add<T: AddressOp>(self, rhs: T) -> Self {
|
||
|
|
Self(self.0.saturating_add(rhs.cast_u64()))
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Saturating integer subtraction. Computes self - rhs, saturating at the numeric bounds instead of overflowing.
|
||
|
|
#[inline]
|
||
|
|
pub fn saturating_sub<T: AddressOp>(self, rhs: T) -> Self {
|
||
|
|
Self(self.0.saturating_sub(rhs.cast_u64()))
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Cast or if smaller, truncate to [`usize`]
|
||
|
|
pub fn truncate_usize(self) -> usize {
|
||
|
|
self.0 as _
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Get inner value
|
||
|
|
#[inline(always)]
|
||
|
|
pub fn get(self) -> u64 {
|
||
|
|
self.0
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Construct new address
|
||
|
|
#[inline(always)]
|
||
|
|
pub fn new(val: u64) -> Self {
|
||
|
|
Self(val)
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Do something with inner value
|
||
|
|
#[inline(always)]
|
||
|
|
pub fn map(self, f: impl Fn(u64) -> u64) -> Self {
|
||
|
|
Self(f(self.0))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: AddressOp> ops::Add<T> for Address {
|
||
|
|
type Output = Self;
|
||
|
|
|
||
|
|
#[inline]
|
||
|
|
fn add(self, rhs: T) -> Self::Output {
|
||
|
|
Self(self.0.wrapping_add(rhs.cast_u64()))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: AddressOp> ops::Sub<T> for Address {
|
||
|
|
type Output = Self;
|
||
|
|
|
||
|
|
#[inline]
|
||
|
|
fn sub(self, rhs: T) -> Self::Output {
|
||
|
|
Self(self.0.wrapping_sub(rhs.cast_u64()))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: AddressOp> ops::AddAssign<T> for Address {
|
||
|
|
fn add_assign(&mut self, rhs: T) {
|
||
|
|
self.0 = self.0.wrapping_add(rhs.cast_u64())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: AddressOp> ops::SubAssign<T> for Address {
|
||
|
|
fn sub_assign(&mut self, rhs: T) {
|
||
|
|
self.0 = self.0.wrapping_sub(rhs.cast_u64())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl From<Address> for u64 {
|
||
|
|
#[inline(always)]
|
||
|
|
fn from(value: Address) -> Self {
|
||
|
|
value.0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl Debug for Address {
|
||
|
|
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||
|
|
write!(f, "[{:0x}]", self.0)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Can perform address operations with
|
||
|
|
pub trait AddressOp {
|
||
|
|
/// Cast to u64, truncating or extending
|
||
|
|
fn cast_u64(self) -> u64;
|
||
|
|
}
|
||
|
|
|
||
|
|
macro_rules! impl_address_ops(($($ty:ty),* $(,)?) => {
|
||
|
|
$(impl AddressOp for $ty {
|
||
|
|
#[inline(always)]
|
||
|
|
fn cast_u64(self) -> u64 { self as _ }
|
||
|
|
})*
|
||
|
|
});
|
||
|
|
|
||
|
|
impl_address_ops!(u8, u16, u32, u64, usize);
|