ecf2390fb0
...which seems not to be available on some platforms. Or maybe it is under a different name but I don't want to deal with that Instead, use two u64s. This isn't exactly the same, but we already have some coverage of the packed u128 case in another test, so it's not essential to have it here.
95 lines
1.9 KiB
Rust
95 lines
1.9 KiB
Rust
// Issue #80127: Passing structs via FFI should work with explicit alignment.
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use std::ffi::{CStr, c_char};
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use std::ptr::null_mut;
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#[derive(Copy, Clone)]
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#[repr(C)]
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pub struct BoolAndU32 {
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pub a: bool,
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pub b: u32,
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}
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#[derive(Copy, Clone)]
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#[repr(C)]
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#[repr(align(16))]
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pub struct TwoU64s {
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pub a: u64,
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pub b: u64,
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}
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#[derive(Copy, Clone)]
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#[repr(C)]
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pub struct WrappedU64s {
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pub a: TwoU64s
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}
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#[derive(Copy, Clone)]
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#[repr(C)]
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// Even though requesting align 1 can never change the alignment, it still affects the ABI
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// on some platforms like i686-windows.
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#[repr(align(1))]
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pub struct LowerAlign {
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pub a: u64,
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pub b: u64,
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}
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#[derive(Copy, Clone)]
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#[repr(C)]
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#[repr(packed)]
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pub struct Packed {
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pub a: u64,
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pub b: u64,
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}
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#[link(name = "test", kind = "static")]
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extern "C" {
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fn many_args(
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a: *mut (),
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b: *mut (),
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c: *const c_char,
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d: u64,
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e: bool,
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f: BoolAndU32,
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g: *mut (),
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h: TwoU64s,
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i: *mut (),
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j: WrappedU64s,
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k: *mut (),
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l: LowerAlign,
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m: *mut (),
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n: Packed,
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o: *const c_char,
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) -> i32;
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}
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const STRING: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"Hello world\0") };
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fn main() {
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let bool_and_u32 = BoolAndU32 { a: true, b: 1337 };
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let two_u64s = TwoU64s { a: 1, b: 2 };
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let wrapped = WrappedU64s { a: TwoU64s { a: 3, b: 4 } };
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let lower = LowerAlign { a: 5, b: 6 };
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let packed = Packed { a: 7, b: 8 };
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let string = STRING;
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unsafe {
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many_args(
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null_mut(),
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null_mut(),
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null_mut(),
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42,
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true,
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bool_and_u32,
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null_mut(),
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two_u64s,
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null_mut(),
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wrapped,
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null_mut(),
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lower,
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null_mut(),
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packed,
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string.as_ptr(),
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);
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}
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}
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