112 lines
1.9 KiB
Rust
112 lines
1.9 KiB
Rust
//@ run-pass
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#![allow(dead_code)]
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use std::mem::{size_of, align_of};
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#[repr(i8)]
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enum Ei8 {
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Ai8 = 0,
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Bi8 = 1
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}
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#[repr(u8)]
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enum Eu8 {
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Au8 = 0,
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Bu8 = 1
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}
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#[repr(i16)]
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enum Ei16 {
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Ai16 = 0,
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Bi16 = 1
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}
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#[repr(u16)]
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enum Eu16 {
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Au16 = 0,
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Bu16 = 1
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}
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#[repr(i32)]
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enum Ei32 {
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Ai32 = 0,
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Bi32 = 1
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}
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#[repr(u32)]
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enum Eu32 {
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Au32 = 0,
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Bu32 = 1
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}
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#[repr(i64)]
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enum Ei64 {
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Ai64 = 0,
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Bi64 = 1
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}
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#[repr(u64)]
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enum Eu64 {
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Au64 = 0,
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Bu64 = 1
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}
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#[repr(isize)]
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enum Eint {
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Aint = 0,
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Bint = 1
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}
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#[repr(usize)]
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enum Euint {
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Auint = 0,
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Buint = 1
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}
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#[repr(u8)]
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enum Eu8NonCLike<T> {
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_None,
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_Some(T),
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}
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#[repr(i64)]
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enum Ei64NonCLike<T> {
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_None,
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_Some(T),
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}
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#[repr(u64)]
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enum Eu64NonCLike<T> {
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_None,
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_Some(T),
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}
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pub fn main() {
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assert_eq!(size_of::<Ei8>(), 1);
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assert_eq!(size_of::<Eu8>(), 1);
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assert_eq!(size_of::<Ei16>(), 2);
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assert_eq!(size_of::<Eu16>(), 2);
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assert_eq!(size_of::<Ei32>(), 4);
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assert_eq!(size_of::<Eu32>(), 4);
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assert_eq!(size_of::<Ei64>(), 8);
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assert_eq!(size_of::<Eu64>(), 8);
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assert_eq!(size_of::<Eint>(), size_of::<isize>());
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assert_eq!(size_of::<Euint>(), size_of::<usize>());
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assert_eq!(size_of::<Eu8NonCLike<()>>(), 1);
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assert_eq!(size_of::<Ei64NonCLike<()>>(), 8);
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assert_eq!(size_of::<Eu64NonCLike<()>>(), 8);
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let u8_expected_size = round_up(9, align_of::<Eu64NonCLike<u8>>());
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assert_eq!(size_of::<Eu64NonCLike<u8>>(), u8_expected_size);
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let array_expected_size = round_up(28, align_of::<Eu64NonCLike<[u32; 5]>>());
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assert_eq!(size_of::<Eu64NonCLike<[u32; 5]>>(), array_expected_size);
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assert_eq!(size_of::<Eu64NonCLike<[u32; 6]>>(), 32);
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assert_eq!(align_of::<Eu32>(), align_of::<u32>());
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assert_eq!(align_of::<Eu64NonCLike<u8>>(), align_of::<u64>());
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}
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// Rounds x up to the next multiple of a
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fn round_up(x: usize, a: usize) -> usize {
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((x + (a - 1)) / a) * a
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}
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