1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![feature(rustc_attrs)]
13 // check raw fat pointer ops in mir
14 // FIXME: please improve this when we get monomorphization support
18 #[derive(Debug, PartialEq, Eq)]
19 struct ComparisonResults {
28 const LT: ComparisonResults = ComparisonResults {
37 const EQ: ComparisonResults = ComparisonResults {
46 const GT: ComparisonResults = ComparisonResults {
56 fn compare_su8(a: *const S<[u8]>, b: *const S<[u8]>) -> ComparisonResults {
68 fn compare_au8(a: *const [u8], b: *const [u8]) -> ComparisonResults {
79 #[rustc_mir(graphviz="comparefoo.gv")]
80 fn compare_foo<'a>(a: *const (Foo+'a), b: *const (Foo+'a)) -> ComparisonResults {
91 #[rustc_mir(graphviz="simpleeq.gv")]
92 fn simple_eq<'a>(a: *const (Foo+'a), b: *const (Foo+'a)) -> bool {
97 fn assert_inorder<T: Copy>(a: &[T],
98 compare: fn(T, T) -> ComparisonResults) {
100 for j in 0..a.len() {
101 let cres = compare(a[i], a[j]);
103 assert_eq!(cres, LT);
105 assert_eq!(cres, EQ);
107 assert_eq!(cres, GT);
113 trait Foo { fn foo(&self) -> usize; }
115 fn foo(&self) -> usize {
120 struct S<T:?Sized>(u32, T);
123 let array = [0,1,2,3,4];
124 let array2 = [5,6,7,8,9];
126 // fat ptr comparison: addr then extra
128 // check ordering for arrays
129 let mut ptrs: Vec<*const [u8]> = vec![
130 &array[0..0], &array[0..1], &array, &array[1..]
133 let array_addr = &array as *const [u8] as *const u8 as usize;
134 let array2_addr = &array2 as *const [u8] as *const u8 as usize;
135 if array2_addr < array_addr {
136 ptrs.insert(0, &array2);
140 assert_inorder(&ptrs, compare_au8);
142 let u8_ = (0u8, 1u8);
143 let u32_ = (4u32, 5u32);
145 // check ordering for ptrs
146 let buf: &mut [*const Foo] = &mut [
151 let u : [*const (); 2] = unsafe { mem::transmute(*u) };
152 let v : [*const (); 2] = unsafe { mem::transmute(*v) };
155 assert_inorder(buf, compare_foo);
157 // check ordering for structs containing arrays
166 &ss.0 as *const S<[u8]>,
167 &ss.1 as *const S<[u8]>,
168 &ss.2 as *const S<[u8]>
171 assert!(simple_eq(&0u8 as *const _, &0u8 as *const _));
172 assert!(!simple_eq(&0u8 as *const _, &1u8 as *const _));