1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![allow(non_camel_case_types)]
13 #![feature(never_type)]
15 use std::mem::size_of;
17 struct t {a: u8, b: i8}
18 struct u {a: u8, b: i8, c: u8}
19 struct v {a: u8, b: i8, c: v2, d: u32}
20 struct v2 {u: char, v: u8}
21 struct w {a: isize, b: ()}
22 struct x {a: isize, b: (), c: ()}
37 struct ReorderedStruct {
73 enum EnumWithMaybeUninhabitedVariant<T> {
79 enum NicheFilledEnumWithAbsentVariant {
86 assert_eq!(size_of::<u8>(), 1 as usize);
87 assert_eq!(size_of::<u32>(), 4 as usize);
88 assert_eq!(size_of::<char>(), 4 as usize);
89 assert_eq!(size_of::<i8>(), 1 as usize);
90 assert_eq!(size_of::<i32>(), 4 as usize);
91 assert_eq!(size_of::<t>(), 2 as usize);
92 assert_eq!(size_of::<u>(), 3 as usize);
93 // Alignment causes padding before the char and the u32.
95 assert_eq!(size_of::<v>(),
97 assert_eq!(size_of::<isize>(), size_of::<usize>());
98 assert_eq!(size_of::<w>(), size_of::<isize>());
99 assert_eq!(size_of::<x>(), size_of::<isize>());
100 assert_eq!(size_of::<isize>(), size_of::<y>());
102 // Make sure enum types are the appropriate size, mostly
103 // around ensuring alignment is handled properly
105 assert_eq!(size_of::<e1>(), 8 as usize);
106 assert_eq!(size_of::<e2>(), 8 as usize);
107 assert_eq!(size_of::<e3>(), 4 as usize);
108 assert_eq!(size_of::<ReorderedStruct>(), 4);
109 assert_eq!(size_of::<ReorderedEnum>(), 6);
111 assert_eq!(size_of::<EnumEmpty>(), 0);
112 assert_eq!(size_of::<EnumSingle1>(), 0);
113 assert_eq!(size_of::<EnumSingle2>(), 0);
114 assert_eq!(size_of::<EnumSingle3>(), 0);
115 assert_eq!(size_of::<EnumSingle4>(), 1);
116 assert_eq!(size_of::<EnumSingle5>(), 1);
118 assert_eq!(size_of::<EnumWithMaybeUninhabitedVariant<!>>(),
119 size_of::<EnumWithMaybeUninhabitedVariant<()>>());
120 assert_eq!(size_of::<NicheFilledEnumWithAbsentVariant>(), size_of::<&'static ()>());
122 assert_eq!(size_of::<Option<Option<(bool, &())>>>(), size_of::<(bool, &())>());
123 assert_eq!(size_of::<Option<Option<(&(), bool)>>>(), size_of::<(bool, &())>());