111 lines
2.7 KiB
Rust
111 lines
2.7 KiB
Rust
// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Issue #2303
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#![feature(intrinsics)]
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use std::mem;
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mod rusti {
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extern "rust-intrinsic" {
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pub fn pref_align_of<T>() -> usize;
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pub fn min_align_of<T>() -> usize;
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}
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}
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// This is the type with the questionable alignment
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#[derive(Debug)]
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struct Inner {
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c64: u64
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}
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// This is the type that contains the type with the
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// questionable alignment, for testing
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#[derive(Debug)]
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struct Outer {
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c8: u8,
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t: Inner
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}
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#[cfg(any(target_os = "linux",
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target_os = "macos",
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target_os = "freebsd",
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target_os = "dragonfly",
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target_os = "openbsd"))]
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mod m {
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#[cfg(target_arch = "x86")]
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pub mod m {
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pub fn align() -> usize { 4 }
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pub fn size() -> usize { 12 }
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}
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#[cfg(any(target_arch = "x86_64", target_arch = "arm", target_arch = "aarch64"))]
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pub mod m {
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pub fn align() -> usize { 8 }
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pub fn size() -> usize { 16 }
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}
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}
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#[cfg(target_os = "bitrig")]
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mod m {
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#[cfg(target_arch = "x86_64")]
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pub mod m {
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pub fn align() -> usize { 8 }
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pub fn size() -> usize { 16 }
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}
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}
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#[cfg(target_os = "windows")]
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mod m {
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#[cfg(target_arch = "x86")]
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pub mod m {
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pub fn align() -> usize { 8 }
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pub fn size() -> usize { 16 }
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}
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#[cfg(target_arch = "x86_64")]
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pub mod m {
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pub fn align() -> usize { 8 }
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pub fn size() -> usize { 16 }
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}
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}
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#[cfg(target_os = "android")]
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mod m {
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#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
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pub mod m {
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pub fn align() -> usize { 8 }
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pub fn size() -> usize { 16 }
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}
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}
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pub fn main() {
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unsafe {
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let x = Outer {c8: 22, t: Inner {c64: 44}};
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let y = format!("{:?}", x);
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println!("align inner = {:?}", rusti::min_align_of::<Inner>());
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println!("size outer = {:?}", mem::size_of::<Outer>());
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println!("y = {:?}", y);
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// per clang/gcc the alignment of `Inner` is 4 on x86.
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assert_eq!(rusti::min_align_of::<Inner>(), m::m::align());
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// per clang/gcc the size of `Outer` should be 12
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// because `Inner`s alignment was 4.
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assert_eq!(mem::size_of::<Outer>(), m::m::size());
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assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
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}
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}
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