74 lines
1.5 KiB
Rust
74 lines
1.5 KiB
Rust
#![feature(rustc_attrs)]
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#[no_mangle]
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extern "C" fn foo() -> i32 {
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-1
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}
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#[export_name = "bar"]
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fn bar() -> i32 {
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-2
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}
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#[rustc_std_internal_symbol]
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fn baz() -> i32 {
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-3
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}
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// Make sure shims take precedence.
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#[no_mangle]
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extern "C" fn exit(_: i32) -> ! {
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unreachable!()
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}
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#[no_mangle]
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extern "C" fn ExitProcess(_: u32) -> ! {
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unreachable!()
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}
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fn main() {
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// Repeat calls to make sure the `Instance` cache is not broken.
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for _ in 0..3 {
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extern "C" {
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fn foo() -> i32;
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}
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assert_eq!(unsafe { foo() }, -1);
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extern "Rust" {
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fn bar() -> i32;
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fn baz() -> i32;
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}
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assert_eq!(unsafe { bar() }, -2);
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assert_eq!(unsafe { baz() }, -3);
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#[allow(clashing_extern_declarations)]
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{
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extern "Rust" {
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fn foo() -> i32;
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}
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assert_eq!(
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unsafe {
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std::mem::transmute::<unsafe fn() -> i32, unsafe extern "C" fn() -> i32>(foo)()
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},
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-1
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);
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extern "C" {
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fn bar() -> i32;
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fn baz() -> i32;
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}
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unsafe {
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let transmute = |f| {
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std::mem::transmute::<unsafe extern "C" fn() -> i32, unsafe fn() -> i32>(f)
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};
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assert_eq!(transmute(bar)(), -2);
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assert_eq!(transmute(baz)(), -3);
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}
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}
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}
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}
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