tests/ui/sanitizer/cfi/supertraits.rs

#![feature(trait_upcasting)]
// Check that super-traits are callable.

//@ revisions: cfi kcfi
// FIXME(#122848) Remove only-linux once OSX CFI binaries work
//@ only-linux
//@ [cfi] needs-sanitizer-cfi
//@ [kcfi] needs-sanitizer-kcfi
//@ compile-flags: -C target-feature=-crt-static
//@ [cfi] compile-flags: -C codegen-units=1 -C lto -C prefer-dynamic=off -C opt-level=0
//@ [cfi] compile-flags: -Z sanitizer=cfi
//@ [kcfi] compile-flags: -Z sanitizer=kcfi
//@ [kcfi] compile-flags: -C panic=abort -C prefer-dynamic=off
//@ run-pass

trait Parent1 {
    type P1;
    fn p1(&self) -> Self::P1;
    fn d(&self) -> i32 {
        42
    }
}

trait Parent2 {
    type P2;
    fn p2(&self) -> Self::P2;
}

trait Child : Parent1 + Parent2 {
    type C;
    fn c(&self) -> Self::C;
}

struct Foo;

impl Parent1 for Foo {
    type P1 = u16;
    fn p1(&self) -> Self::P1 {
        println!("p1");
        1
    }
}

impl Parent2 for Foo {
    type P2 = u32;
    fn p2(&self) -> Self::P2 {
        println!("p2");
        2
    }
}

impl Child for Foo {
    type C = u8;
    fn c(&self) -> Self::C {
        println!("c");
        0
    }
}

fn main() {
    // Child can access its own methods and super methods.
    let x = &Foo as &dyn Child<C=u8,P1=u16,P2=u32>;
    x.c();
    x.p1();
    x.p2();
    x.d();
    // Parents can be created and access their methods.
    let y = &Foo as &dyn Parent1<P1=u16>;
    y.p1();
    y.d();
    let z = &Foo as &dyn Parent2<P2=u32>;
    z.p2();
    // Trait upcasting works
    let x1 = x as &dyn Parent1<P1=u16>;
    x1.p1();
    x1.d();
    let x2 = x as &dyn Parent2<P2=u32>;
    x2.p2();
}