rust/tests/run-pass/function_calls/exported_symbol.rs

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2021-04-15 16:19:23 -05:00
#![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
}
// Make sure shims take precedence.
#[no_mangle]
extern "C" fn exit(_: i32) -> ! {
unreachable!()
}
#[no_mangle]
extern "C" fn ExitProcess(_: u32) -> ! {
unreachable!()
}
fn main() {
// Repeat calls to make sure the `Instance` cache is not broken.
for _ in 0..3 {
extern "C" {
fn foo() -> i32;
}
assert_eq!(unsafe { foo() }, -1);
assert_eq!(unsafe { foo() }, -1);
extern "Rust" {
fn bar() -> i32;
fn baz() -> i32;
}
assert_eq!(unsafe { bar() }, -2);
assert_eq!(unsafe { baz() }, -3);
}
}