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// Passing structs via FFI should work regardless of whether
// they get passed in multiple registers, byval pointers or the stack
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct Rect {
a: i32,
b: i32,
c: i32,
d: i32,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct BiggerRect {
s: Rect,
a: i32,
b: i32,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct FloatRect {
a: i32,
b: i32,
c: f64,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct Huge {
a: i32,
b: i32,
c: i32,
d: i32,
e: i32,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct FloatPoint {
x: f64,
y: f64,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct FloatOne {
x: f64,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[repr(C)]
struct IntOdd {
a: i8,
b: i8,
c: i8,
}
#[link(name = "test", kind = "static")]
extern "C" {
fn byval_rect(a: i32, b: i32, c: i32, d: i32, e: i32, s: Rect);
fn byval_many_rect(a: i32, b: i32, c: i32, d: i32, e: i32, f: i32, s: Rect);
fn byval_rect_floats(
a: f32,
b: f32,
c: f64,
d: f32,
e: f32,
f: f32,
g: f64,
s: Rect,
t: FloatRect,
);
fn byval_rect_with_float(a: i32, b: i32, c: f32, d: i32, e: i32, f: i32, s: Rect);
fn byval_rect_with_many_huge(a: Huge, b: Huge, c: Huge, d: Huge, e: Huge, f: Huge, g: Rect);
fn split_rect(a: i32, b: i32, s: Rect);
fn split_rect_floats(a: f32, b: f32, s: FloatRect);
fn split_rect_with_floats(a: i32, b: i32, c: f32, d: i32, e: f32, f: i32, s: Rect);
fn split_and_byval_rect(a: i32, b: i32, c: i32, s: Rect, t: Rect);
fn split_ret_byval_struct(a: i32, b: i32, s: Rect) -> Rect;
fn sret_byval_struct(a: i32, b: i32, c: i32, d: i32, s: Rect) -> BiggerRect;
fn sret_split_struct(a: i32, b: i32, s: Rect) -> BiggerRect;
fn huge_struct(s: Huge) -> Huge;
fn float_point(p: FloatPoint) -> FloatPoint;
fn float_one(f: FloatOne) -> FloatOne;
fn int_odd(i: IntOdd) -> IntOdd;
}
fn main() {
let s = Rect { a: 553, b: 554, c: 555, d: 556 };
let t = BiggerRect { s: s, a: 27834, b: 7657 };
let u = FloatRect { a: 3489, b: 3490, c: 8. };
let v = Huge { a: 5647, b: 5648, c: 5649, d: 5650, e: 5651 };
let p = FloatPoint { x: 5., y: -3. };
let f1 = FloatOne { x: 7. };
let i = IntOdd { a: 1, b: 2, c: 3 };
unsafe {
byval_rect(1, 2, 3, 4, 5, s);
byval_many_rect(1, 2, 3, 4, 5, 6, s);
byval_rect_floats(1., 2., 3., 4., 5., 6., 7., s, u);
byval_rect_with_float(1, 2, 3.0, 4, 5, 6, s);
byval_rect_with_many_huge(v, v, v, v, v, v, Rect { a: 123, b: 456, c: 789, d: 420 });
split_rect(1, 2, s);
split_rect_floats(1., 2., u);
split_rect_with_floats(1, 2, 3.0, 4, 5.0, 6, s);
split_and_byval_rect(1, 2, 3, s, s);
split_rect(1, 2, s);
assert_eq!(huge_struct(v), v);
assert_eq!(split_ret_byval_struct(1, 2, s), s);
assert_eq!(sret_byval_struct(1, 2, 3, 4, s), t);
assert_eq!(sret_split_struct(1, 2, s), t);
assert_eq!(float_point(p), p);
assert_eq!(int_odd(i), i);
// MSVC/GCC/Clang are not consistent in the ABI of single-float aggregates.
// x86_64: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82028
// i686: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82041
#[cfg(not(all(windows, target_env = "gnu")))]
assert_eq!(float_one(f1), f1);
}
}
|
