1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
pub(crate) fn aligned(value: u64, align: u64) -> u64 { debug_assert_ne!(align, 0); debug_assert_eq!(align.count_ones(), 1); if value == 0 { 0 } else { 1u64 + ((value - 1u64) | (align - 1u64)) } } pub(crate) trait IntegerFitting { fn fits_usize(self) -> bool; fn fits_isize(self) -> bool; fn usize_fits(value: usize) -> bool; fn isize_fits(value: isize) -> bool; } #[cfg(any(target_pointer_width = "16", target_pointer_width = "32"))] impl IntegerFitting for u64 { fn fits_usize(self) -> bool { self <= usize::max_value() as u64 } fn fits_isize(self) -> bool { self <= isize::max_value() as u64 } fn usize_fits(_value: usize) -> bool { true } fn isize_fits(value: isize) -> bool { value >= 0 } } #[cfg(target_pointer_width = "64")] impl IntegerFitting for u64 { fn fits_usize(self) -> bool { true } fn fits_isize(self) -> bool { self <= isize::max_value() as u64 } fn usize_fits(_value: usize) -> bool { true } fn isize_fits(value: isize) -> bool { value >= 0 } } #[cfg(not(any( target_pointer_width = "16", target_pointer_width = "32", target_pointer_width = "64" )))] impl IntegerFitting for u64 { fn fits_usize(self) -> bool { true } fn fits_isize(self) -> bool { true } fn usize_fits(value: usize) -> bool { value <= u64::max_value() as usize } fn isize_fits(value: isize) -> bool { value >= 0 && value <= u64::max_value() as isize } } #[cfg(target_pointer_width = "16")] impl IntegerFitting for u32 { fn fits_usize(self) -> bool { self <= usize::max_value() as u32 } fn fits_isize(self) -> bool { self <= isize::max_value() as u32 } fn usize_fits(_value: usize) -> bool { true } fn isize_fits(value: isize) -> bool { value >= 0 } } #[cfg(target_pointer_width = "32")] impl IntegerFitting for u32 { fn fits_usize(self) -> bool { true } fn fits_isize(self) -> bool { self <= isize::max_value() as u32 } fn usize_fits(_value: usize) -> bool { true } fn isize_fits(value: isize) -> bool { value >= 0 } } #[cfg(not(any(target_pointer_width = "16", target_pointer_width = "32")))] impl IntegerFitting for u32 { fn fits_usize(self) -> bool { true } fn fits_isize(self) -> bool { true } fn usize_fits(value: usize) -> bool { value <= u32::max_value() as usize } fn isize_fits(value: isize) -> bool { value >= 0 && value <= u32::max_value() as isize } } pub(crate) fn fits_usize<T: IntegerFitting>(value: T) -> bool { value.fits_usize() } pub(crate) fn fits_u32(value: usize) -> bool { u32::usize_fits(value) }