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fn main() {
test_pass_struct();
test_pass_struct_complex();
}
/// Test passing a basic struct as an argument.
fn test_pass_struct() {
// Exactly two fields, so that we hit the ScalarPair case.
#[repr(C)]
struct PassMe {
value: i32,
other_value: i64,
}
extern "C" {
fn pass_struct(s: PassMe) -> i64;
}
let pass_me = PassMe { value: 42, other_value: 1337 };
assert_eq!(unsafe { pass_struct(pass_me) }, 42 + 1337);
}
/// Test passing a more complex struct as an argument.
fn test_pass_struct_complex() {
#[repr(C)]
struct ComplexStruct {
part_1: Part1,
part_2: Part2,
part_3: u32,
}
#[repr(C)]
struct Part1 {
high: u16,
low: u16,
}
#[repr(C)]
struct Part2 {
bits: u32,
}
extern "C" {
fn pass_struct_complex(s: ComplexStruct, high: u16, low: u16, bits: u32) -> i32;
}
let high = 0xabcd;
let low = 0xef01;
let bits = 0xabcdef01;
let complex =
ComplexStruct { part_1: Part1 { high, low }, part_2: Part2 { bits }, part_3: bits };
assert_eq!(unsafe { pass_struct_complex(complex, high, low, bits) }, 0);
}
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