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//@ run-pass
#![allow(dead_code)]
use std::mem::{size_of, align_of};
use std::os::raw::c_int;
// The two enums that follow are designed so that bugs trigger layout optimization.
// Specifically, if either of the following reprs used here is not detected by the compiler,
// then the sizes will be wrong.
#[repr(C, u8)]
enum E1 {
A(u8, u16, u8),
B(u8, u16, u8)
}
#[repr(u8, C)]
enum E2 {
A(u8, u16, u8),
B(u8, u16, u8)
}
// Check that repr(int) and repr(C) are in fact different from the above
#[repr(u8)]
enum E3 {
A(u8, u16, u8),
B(u8, u16, u8)
}
#[repr(u16)]
enum E4 {
A(u8, u16, u8),
B(u8, u16, u8)
}
#[repr(u32)]
enum E5 {
A(u8, u16, u8),
B(u8, u16, u8)
}
#[repr(u64)]
enum E6 {
A(u8, u16, u8),
B(u8, u16, u8)
}
#[repr(C)]
enum E7 {
A(u8, u16, u8),
B(u8, u16, u8)
}
// From pr 37429
#[repr(C,packed)]
pub struct p0f_api_query {
pub magic: u32,
pub addr_type: u8,
pub addr: [u8; 16],
}
pub fn main() {
assert_eq!(size_of::<E1>(), 8);
assert_eq!(size_of::<E2>(), 8);
assert_eq!(size_of::<E3>(), 6);
assert_eq!(size_of::<E4>(), 8);
assert_eq!(size_of::<E5>(), align_size(10, align_of::<u32>()));
assert_eq!(size_of::<E6>(), align_size(14, align_of::<u64>()));
assert_eq!(size_of::<E7>(), align_size(6 + c_enum_min_size(), align_of::<c_int>()));
assert_eq!(size_of::<p0f_api_query>(), 21);
}
fn align_size(size: usize, align: usize) -> usize {
if size % align != 0 {
size + (align - (size % align))
} else {
size
}
}
// this is `TargetOptions.c_enum_min_bits` which is not available as a `cfg` value so we retrieve
// the value at runtime. On most targets this is `sizeof(c_int)` but on `thumb*-none` is 1 byte
fn c_enum_min_size() -> usize {
#[repr(C)]
enum E {
A,
}
size_of::<E>()
}
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