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Diffstat (limited to 'rust/qemu-api/src/bitops.rs')
| -rw-r--r-- | rust/qemu-api/src/bitops.rs | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/rust/qemu-api/src/bitops.rs b/rust/qemu-api/src/bitops.rs deleted file mode 100644 index b1e3a530ab..0000000000 --- a/rust/qemu-api/src/bitops.rs +++ /dev/null @@ -1,119 +0,0 @@ -// Copyright (C) 2024 Intel Corporation. -// Author(s): Zhao Liu <zhao1.liu@intel.com> -// SPDX-License-Identifier: GPL-2.0-or-later - -//! This module provides bit operation extensions to integer types. -//! It is usually included via the `qemu_api` prelude. - -use std::ops::{ - Add, AddAssign, BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Div, DivAssign, - Mul, MulAssign, Not, Rem, RemAssign, Shl, ShlAssign, Shr, ShrAssign, -}; - -/// Trait for extensions to integer types -pub trait IntegerExt: - Add<Self, Output = Self> + AddAssign<Self> + - BitAnd<Self, Output = Self> + BitAndAssign<Self> + - BitOr<Self, Output = Self> + BitOrAssign<Self> + - BitXor<Self, Output = Self> + BitXorAssign<Self> + - Copy + - Div<Self, Output = Self> + DivAssign<Self> + - Eq + - Mul<Self, Output = Self> + MulAssign<Self> + - Not<Output = Self> + Ord + PartialOrd + - Rem<Self, Output = Self> + RemAssign<Self> + - Shl<Self, Output = Self> + ShlAssign<Self> + - Shl<u32, Output = Self> + ShlAssign<u32> + // add more as needed - Shr<Self, Output = Self> + ShrAssign<Self> + - Shr<u32, Output = Self> + ShrAssign<u32> // add more as needed -{ - const BITS: u32; - const MAX: Self; - const MIN: Self; - const ONE: Self; - const ZERO: Self; - - #[inline] - #[must_use] - fn bit(start: u32) -> Self - { - debug_assert!(start < Self::BITS); - - Self::ONE << start - } - - #[inline] - #[must_use] - fn mask(start: u32, length: u32) -> Self - { - /* FIXME: Implement a more elegant check with error handling support? */ - debug_assert!(start < Self::BITS && length > 0 && length <= Self::BITS - start); - - (Self::MAX >> (Self::BITS - length)) << start - } - - #[inline] - #[must_use] - fn deposit<U: IntegerExt>(self, start: u32, length: u32, - fieldval: U) -> Self - where Self: From<U> - { - debug_assert!(length <= U::BITS); - - let mask = Self::mask(start, length); - (self & !mask) | ((Self::from(fieldval) << start) & mask) - } - - #[inline] - #[must_use] - fn extract(self, start: u32, length: u32) -> Self - { - let mask = Self::mask(start, length); - (self & mask) >> start - } -} - -macro_rules! impl_num_ext { - ($type:ty) => { - impl IntegerExt for $type { - const BITS: u32 = <$type>::BITS; - const MAX: Self = <$type>::MAX; - const MIN: Self = <$type>::MIN; - const ONE: Self = 1; - const ZERO: Self = 0; - } - }; -} - -impl_num_ext!(u8); -impl_num_ext!(u16); -impl_num_ext!(u32); -impl_num_ext!(u64); - -#[cfg(test)] -mod tests { - use super::*; - - #[test] - fn test_deposit() { - assert_eq!(15u32.deposit(8, 8, 1u32), 256 + 15); - assert_eq!(15u32.deposit(8, 1, 255u8), 256 + 15); - } - - #[test] - fn test_extract() { - assert_eq!(15u32.extract(2, 4), 3); - } - - #[test] - fn test_bit() { - assert_eq!(u8::bit(7), 128); - assert_eq!(u32::bit(16), 0x10000); - } - - #[test] - fn test_mask() { - assert_eq!(u8::mask(7, 1), 128); - assert_eq!(u32::mask(8, 8), 0xff00); - } -} |