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// Issue #80127: Passing structs via FFI should work with explicit alignment.
use std::ffi::{CStr, c_char};
use std::ptr::null_mut;
#[repr(C)]
pub struct BoolAndU32 {
pub a: bool,
pub b: u32,
}
#[repr(C)]
#[repr(align(16))]
pub struct TwoU64s {
pub a: u64,
pub b: u64,
}
#[repr(C)]
pub struct WrappedU64s {
pub a: TwoU64s
}
#[repr(C)]
// Even though requesting align 1 can never change the alignment, it still affects the ABI
// on some platforms like i686-windows.
#[repr(align(1))]
pub struct LowerAlign {
pub a: u64,
pub b: u64,
}
#[repr(C)]
#[repr(packed)]
pub struct Packed {
pub a: u64,
pub b: u64,
}
#[link(name = "test", kind = "static")]
extern "C" {
fn many_args(
a: *mut (),
b: *mut (),
c: *const c_char,
d: u64,
e: bool,
f: BoolAndU32,
g: *mut (),
h: TwoU64s,
i: *mut (),
j: WrappedU64s,
k: *mut (),
l: LowerAlign,
m: *mut (),
n: Packed,
o: *const c_char,
) -> i32;
}
const STRING: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"Hello world\0") };
fn main() {
let bool_and_u32 = BoolAndU32 { a: true, b: 1337 };
let two_u64s = TwoU64s { a: 1, b: 2 };
let wrapped = WrappedU64s { a: TwoU64s { a: 3, b: 4 } };
let lower = LowerAlign { a: 5, b: 6 };
let packed = Packed { a: 7, b: 8 };
let string = STRING;
unsafe {
many_args(
null_mut(),
null_mut(),
null_mut(),
42,
true,
bool_and_u32,
null_mut(),
two_u64s,
null_mut(),
wrapped,
null_mut(),
lower,
null_mut(),
packed,
string.as_ptr(),
);
}
}
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