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|
#![feature(rustc_attrs)]
#[no_mangle]
extern "C" fn foo() -> i32 {
-1
}
#[export_name = "bar"]
fn bar() -> i32 {
-2
}
#[rustc_std_internal_symbol]
fn baz() -> i32 {
-3
}
struct AssocFn;
impl AssocFn {
#[no_mangle]
fn qux() -> i32 {
-4
}
}
fn main() {
// Repeat calls to make sure the `Instance` cache is not broken.
for _ in 0..3 {
extern "C" {
fn foo() -> i32;
fn free(_: *mut std::ffi::c_void);
}
assert_eq!(unsafe { foo() }, -1);
// `free()` is a built-in shim, so calling it will add ("free", None) to the cache.
// Test that the cache is not broken with ("free", None).
unsafe { free(std::ptr::null_mut()) }
extern "Rust" {
fn bar() -> i32;
#[rustc_std_internal_symbol]
fn baz() -> i32;
fn qux() -> i32;
}
assert_eq!(unsafe { bar() }, -2);
assert_eq!(unsafe { baz() }, -3);
assert_eq!(unsafe { qux() }, -4);
#[allow(clashing_extern_declarations)]
{
extern "Rust" {
fn foo() -> i32;
}
assert_eq!(
unsafe {
std::mem::transmute::<unsafe fn() -> i32, unsafe extern "C" fn() -> i32>(foo)()
},
-1
);
extern "C" {
fn bar() -> i32;
#[rustc_std_internal_symbol]
fn baz() -> i32;
fn qux() -> i32;
}
unsafe {
let transmute =
|f| std::mem::transmute::<unsafe extern "C" fn() -> i32, unsafe fn() -> i32>(f);
assert_eq!(transmute(bar)(), -2);
assert_eq!(transmute(baz)(), -3);
assert_eq!(transmute(qux)(), -4);
}
}
}
}
|
