#![allow(clippy::enum_clike_unportable_variant)]
use core::{
cmp, fmt, hash, mem,
num::NonZeroUsize,
ptr::{self, NonNull},
};
#[derive(Clone, Copy)]
#[repr(transparent)]
pub(crate) struct ValidAlign(ValidAlignEnum);
const _: () = assert!(mem::size_of::<ValidAlign>() == mem::size_of::<usize>());
const _: () = assert!(mem::align_of::<ValidAlign>() == mem::align_of::<usize>());
impl ValidAlign {
pub(crate) const ONE: Self = Self::new(1).unwrap();
#[must_use]
#[inline]
pub(crate) const fn new(align: usize) -> Option<Self> {
if align.is_power_of_two() {
Some(
unsafe { Self::new_unckecked(align) },
)
} else {
None
}
}
#[must_use]
#[inline]
pub(crate) const unsafe fn new_unckecked(align: usize) -> Self {
unsafe { mem::transmute::<usize, ValidAlign>(align) }
}
#[must_use]
#[inline]
#[allow(clippy::cast_possible_truncation)] pub(crate) const fn get(self) -> usize {
self.0 as usize
}
#[must_use]
#[inline]
pub(super) const fn minus_1(self) -> usize {
unsafe { self.get().unchecked_sub(1) }
}
#[must_use]
#[inline]
pub(crate) const fn as_nonzero(self) -> NonZeroUsize {
unsafe { NonZeroUsize::new_unchecked(self.0 as usize) }
}
#[must_use]
#[inline]
pub(crate) const fn as_usize(self) -> usize {
self.0 as usize
}
#[must_use]
#[inline]
pub(crate) const fn log2(self) -> u32 {
self.as_nonzero().trailing_zeros()
}
#[must_use]
#[inline]
pub(crate) const fn dangling_thin(self) -> NonNull<()> {
unsafe { NonNull::new_unchecked(ptr::invalid_mut(self.get())) }
}
#[must_use]
#[inline]
pub(crate) const fn of_val<T: ?Sized>(val: &T) -> Self {
unsafe { Self::new_unckecked(mem::align_of_val(val)) }
}
}
impl fmt::Debug for ValidAlign {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?} (1 << {:?})", self.as_nonzero(), self.log2())
}
}
impl From<ValidAlign> for NonZeroUsize {
#[inline]
fn from(value: ValidAlign) -> Self {
value.as_nonzero()
}
}
impl From<ValidAlign> for usize {
#[inline]
fn from(value: ValidAlign) -> Self {
value.get()
}
}
impl PartialEq for ValidAlign {
#[inline]
fn eq(&self, other: &Self) -> bool {
self.get() == other.get()
}
}
impl Eq for ValidAlign {}
impl PartialOrd for ValidAlign {
#[inline]
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
Some(self.cmp(other))
}
}
impl Ord for ValidAlign {
#[inline]
fn cmp(&self, other: &Self) -> cmp::Ordering {
self.get().cmp(&other.get())
}
}
#[allow(clippy::derive_hash_xor_eq)]
impl hash::Hash for ValidAlign {
#[inline]
fn hash<H: hash::Hasher>(&self, state: &mut H) {
self.as_nonzero().hash(state);
}
}
#[cfg(target_pointer_width = "16")]
#[derive(Clone, Copy)]
#[repr(usize)]
enum ValidAlignEnum {
_Align1Shl0 = 1 << 0,
_Align1Shl1 = 1 << 1,
_Align1Shl2 = 1 << 2,
_Align1Shl3 = 1 << 3,
_Align1Shl4 = 1 << 4,
_Align1Shl5 = 1 << 5,
_Align1Shl6 = 1 << 6,
_Align1Shl7 = 1 << 7,
_Align1Shl8 = 1 << 8,
_Align1Shl9 = 1 << 9,
_Align1Shl10 = 1 << 10,
_Align1Shl11 = 1 << 11,
_Align1Shl12 = 1 << 12,
_Align1Shl13 = 1 << 13,
_Align1Shl14 = 1 << 14,
_Align1Shl15 = 1 << 15,
}
#[cfg(target_pointer_width = "32")]
#[derive(Clone, Copy)]
#[repr(usize)]
enum ValidAlignEnum {
_Align1Shl0 = 1 << 0,
_Align1Shl1 = 1 << 1,
_Align1Shl2 = 1 << 2,
_Align1Shl3 = 1 << 3,
_Align1Shl4 = 1 << 4,
_Align1Shl5 = 1 << 5,
_Align1Shl6 = 1 << 6,
_Align1Shl7 = 1 << 7,
_Align1Shl8 = 1 << 8,
_Align1Shl9 = 1 << 9,
_Align1Shl10 = 1 << 10,
_Align1Shl11 = 1 << 11,
_Align1Shl12 = 1 << 12,
_Align1Shl13 = 1 << 13,
_Align1Shl14 = 1 << 14,
_Align1Shl15 = 1 << 15,
_Align1Shl16 = 1 << 16,
_Align1Shl17 = 1 << 17,
_Align1Shl18 = 1 << 18,
_Align1Shl19 = 1 << 19,
_Align1Shl20 = 1 << 20,
_Align1Shl21 = 1 << 21,
_Align1Shl22 = 1 << 22,
_Align1Shl23 = 1 << 23,
_Align1Shl24 = 1 << 24,
_Align1Shl25 = 1 << 25,
_Align1Shl26 = 1 << 26,
_Align1Shl27 = 1 << 27,
_Align1Shl28 = 1 << 28,
_Align1Shl29 = 1 << 29,
_Align1Shl30 = 1 << 30,
_Align1Shl31 = 1 << 31,
}
#[cfg(target_pointer_width = "64")]
#[derive(Clone, Copy)]
#[repr(usize)]
enum ValidAlignEnum {
_Align1Shl0 = 1 << 0,
_Align1Shl1 = 1 << 1,
_Align1Shl2 = 1 << 2,
_Align1Shl3 = 1 << 3,
_Align1Shl4 = 1 << 4,
_Align1Shl5 = 1 << 5,
_Align1Shl6 = 1 << 6,
_Align1Shl7 = 1 << 7,
_Align1Shl8 = 1 << 8,
_Align1Shl9 = 1 << 9,
_Align1Shl10 = 1 << 10,
_Align1Shl11 = 1 << 11,
_Align1Shl12 = 1 << 12,
_Align1Shl13 = 1 << 13,
_Align1Shl14 = 1 << 14,
_Align1Shl15 = 1 << 15,
_Align1Shl16 = 1 << 16,
_Align1Shl17 = 1 << 17,
_Align1Shl18 = 1 << 18,
_Align1Shl19 = 1 << 19,
_Align1Shl20 = 1 << 20,
_Align1Shl21 = 1 << 21,
_Align1Shl22 = 1 << 22,
_Align1Shl23 = 1 << 23,
_Align1Shl24 = 1 << 24,
_Align1Shl25 = 1 << 25,
_Align1Shl26 = 1 << 26,
_Align1Shl27 = 1 << 27,
_Align1Shl28 = 1 << 28,
_Align1Shl29 = 1 << 29,
_Align1Shl30 = 1 << 30,
_Align1Shl31 = 1 << 31,
_Align1Shl32 = 1 << 32,
_Align1Shl33 = 1 << 33,
_Align1Shl34 = 1 << 34,
_Align1Shl35 = 1 << 35,
_Align1Shl36 = 1 << 36,
_Align1Shl37 = 1 << 37,
_Align1Shl38 = 1 << 38,
_Align1Shl39 = 1 << 39,
_Align1Shl40 = 1 << 40,
_Align1Shl41 = 1 << 41,
_Align1Shl42 = 1 << 42,
_Align1Shl43 = 1 << 43,
_Align1Shl44 = 1 << 44,
_Align1Shl45 = 1 << 45,
_Align1Shl46 = 1 << 46,
_Align1Shl47 = 1 << 47,
_Align1Shl48 = 1 << 48,
_Align1Shl49 = 1 << 49,
_Align1Shl50 = 1 << 50,
_Align1Shl51 = 1 << 51,
_Align1Shl52 = 1 << 52,
_Align1Shl53 = 1 << 53,
_Align1Shl54 = 1 << 54,
_Align1Shl55 = 1 << 55,
_Align1Shl56 = 1 << 56,
_Align1Shl57 = 1 << 57,
_Align1Shl58 = 1 << 58,
_Align1Shl59 = 1 << 59,
_Align1Shl60 = 1 << 60,
_Align1Shl61 = 1 << 61,
_Align1Shl62 = 1 << 62,
_Align1Shl63 = 1 << 63,
}