| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // test that ordinary fat pointer operations work. |
| |
| #![feature(rustc_attrs)] |
| |
| struct Wrapper<T: ?Sized>(u32, T); |
| |
| struct FatPtrContainer<'a> { |
| ptr: &'a [u8] |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_project(a: &Wrapper<[u8]>) -> &[u8] { |
| &a.1 |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_simple(a: &[u8]) -> &[u8] { |
| a |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_via_local(a: &[u8]) -> &[u8] { |
| let x = a; |
| x |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_from_struct(s: FatPtrContainer) -> &[u8] { |
| s.ptr |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_to_struct(a: &[u8]) -> FatPtrContainer { |
| FatPtrContainer { ptr: a } |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_store_to<'a>(a: &'a [u8], b: &mut &'a [u8]) { |
| *b = a; |
| } |
| |
| #[rustc_mir] |
| fn fat_ptr_constant() -> &'static str { |
| "HELLO" |
| } |
| |
| fn main() { |
| let a = Wrapper(4, [7,6,5]); |
| |
| let p = fat_ptr_project(&a); |
| let p = fat_ptr_simple(p); |
| let p = fat_ptr_via_local(p); |
| let p = fat_ptr_from_struct(fat_ptr_to_struct(p)); |
| |
| let mut target : &[u8] = &[42]; |
| fat_ptr_store_to(p, &mut target); |
| assert_eq!(target, &a.1); |
| |
| assert_eq!(fat_ptr_constant(), "HELLO"); |
| } |