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1 | // Copyright 2014 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. | |
4 | // | |
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. | |
10 | ||
11 | use core::ptr::*; | |
476ff2be | 12 | use core::cell::RefCell; |
1a4d82fc JJ |
13 | |
14 | #[test] | |
15 | fn test() { | |
16 | unsafe { | |
17 | struct Pair { | |
c34b1796 AL |
18 | fst: isize, |
19 | snd: isize | |
1a4d82fc JJ |
20 | }; |
21 | let mut p = Pair {fst: 10, snd: 20}; | |
22 | let pptr: *mut Pair = &mut p; | |
e9174d1e | 23 | let iptr: *mut isize = pptr as *mut isize; |
1a4d82fc JJ |
24 | assert_eq!(*iptr, 10); |
25 | *iptr = 30; | |
26 | assert_eq!(*iptr, 30); | |
27 | assert_eq!(p.fst, 30); | |
28 | ||
29 | *pptr = Pair {fst: 50, snd: 60}; | |
30 | assert_eq!(*iptr, 50); | |
31 | assert_eq!(p.fst, 50); | |
32 | assert_eq!(p.snd, 60); | |
33 | ||
34 | let v0 = vec![32000u16, 32001u16, 32002u16]; | |
35 | let mut v1 = vec![0u16, 0u16, 0u16]; | |
36 | ||
c34b1796 | 37 | copy(v0.as_ptr().offset(1), v1.as_mut_ptr().offset(1), 1); |
1a4d82fc JJ |
38 | assert!((v1[0] == 0u16 && |
39 | v1[1] == 32001u16 && | |
40 | v1[2] == 0u16)); | |
c34b1796 | 41 | copy(v0.as_ptr().offset(2), v1.as_mut_ptr(), 1); |
1a4d82fc JJ |
42 | assert!((v1[0] == 32002u16 && |
43 | v1[1] == 32001u16 && | |
44 | v1[2] == 0u16)); | |
c34b1796 | 45 | copy(v0.as_ptr(), v1.as_mut_ptr().offset(2), 1); |
1a4d82fc JJ |
46 | assert!((v1[0] == 32002u16 && |
47 | v1[1] == 32001u16 && | |
48 | v1[2] == 32000u16)); | |
49 | } | |
50 | } | |
51 | ||
52 | #[test] | |
53 | fn test_is_null() { | |
c34b1796 | 54 | let p: *const isize = null(); |
1a4d82fc JJ |
55 | assert!(p.is_null()); |
56 | ||
57 | let q = unsafe { p.offset(1) }; | |
58 | assert!(!q.is_null()); | |
59 | ||
c34b1796 | 60 | let mp: *mut isize = null_mut(); |
1a4d82fc JJ |
61 | assert!(mp.is_null()); |
62 | ||
63 | let mq = unsafe { mp.offset(1) }; | |
64 | assert!(!mq.is_null()); | |
65 | } | |
66 | ||
67 | #[test] | |
68 | fn test_as_ref() { | |
69 | unsafe { | |
c34b1796 | 70 | let p: *const isize = null(); |
1a4d82fc JJ |
71 | assert_eq!(p.as_ref(), None); |
72 | ||
c34b1796 | 73 | let q: *const isize = &2; |
1a4d82fc JJ |
74 | assert_eq!(q.as_ref().unwrap(), &2); |
75 | ||
c34b1796 | 76 | let p: *mut isize = null_mut(); |
1a4d82fc JJ |
77 | assert_eq!(p.as_ref(), None); |
78 | ||
c34b1796 | 79 | let q: *mut isize = &mut 2; |
1a4d82fc JJ |
80 | assert_eq!(q.as_ref().unwrap(), &2); |
81 | ||
82 | // Lifetime inference | |
c34b1796 | 83 | let u = 2isize; |
1a4d82fc | 84 | { |
c34b1796 | 85 | let p = &u as *const isize; |
1a4d82fc JJ |
86 | assert_eq!(p.as_ref().unwrap(), &2); |
87 | } | |
abe05a73 XL |
88 | |
89 | // Pointers to unsized types -- slices | |
90 | let s: &mut [u8] = &mut [1, 2, 3]; | |
91 | let cs: *const [u8] = s; | |
92 | assert_eq!(cs.as_ref(), Some(&*s)); | |
93 | ||
94 | let ms: *mut [u8] = s; | |
95 | assert_eq!(ms.as_ref(), Some(&*s)); | |
96 | ||
97 | let cz: *const [u8] = &[]; | |
98 | assert_eq!(cz.as_ref(), Some(&[][..])); | |
99 | ||
100 | let mz: *mut [u8] = &mut []; | |
101 | assert_eq!(mz.as_ref(), Some(&[][..])); | |
102 | ||
103 | let ncs: *const [u8] = null::<[u8; 3]>(); | |
104 | assert_eq!(ncs.as_ref(), None); | |
105 | ||
106 | let nms: *mut [u8] = null_mut::<[u8; 3]>(); | |
107 | assert_eq!(nms.as_ref(), None); | |
108 | ||
109 | // Pointers to unsized types -- trait objects | |
110 | let ci: *const ToString = &3; | |
111 | assert!(ci.as_ref().is_some()); | |
112 | ||
113 | let mi: *mut ToString = &mut 3; | |
114 | assert!(mi.as_ref().is_some()); | |
115 | ||
116 | let nci: *const ToString = null::<isize>(); | |
117 | assert!(nci.as_ref().is_none()); | |
118 | ||
119 | let nmi: *mut ToString = null_mut::<isize>(); | |
120 | assert!(nmi.as_ref().is_none()); | |
1a4d82fc JJ |
121 | } |
122 | } | |
123 | ||
124 | #[test] | |
125 | fn test_as_mut() { | |
126 | unsafe { | |
c34b1796 | 127 | let p: *mut isize = null_mut(); |
1a4d82fc JJ |
128 | assert!(p.as_mut() == None); |
129 | ||
c34b1796 | 130 | let q: *mut isize = &mut 2; |
1a4d82fc JJ |
131 | assert!(q.as_mut().unwrap() == &mut 2); |
132 | ||
133 | // Lifetime inference | |
c34b1796 | 134 | let mut u = 2isize; |
1a4d82fc | 135 | { |
c34b1796 | 136 | let p = &mut u as *mut isize; |
1a4d82fc JJ |
137 | assert!(p.as_mut().unwrap() == &mut 2); |
138 | } | |
abe05a73 XL |
139 | |
140 | // Pointers to unsized types -- slices | |
141 | let s: &mut [u8] = &mut [1, 2, 3]; | |
142 | let ms: *mut [u8] = s; | |
143 | assert_eq!(ms.as_mut(), Some(s)); | |
144 | ||
145 | let mz: *mut [u8] = &mut []; | |
146 | assert_eq!(mz.as_mut(), Some(&mut [][..])); | |
147 | ||
148 | let nms: *mut [u8] = null_mut::<[u8; 3]>(); | |
149 | assert_eq!(nms.as_mut(), None); | |
150 | ||
151 | // Pointers to unsized types -- trait objects | |
152 | let mi: *mut ToString = &mut 3; | |
153 | assert!(mi.as_mut().is_some()); | |
154 | ||
155 | let nmi: *mut ToString = null_mut::<isize>(); | |
156 | assert!(nmi.as_mut().is_none()); | |
1a4d82fc JJ |
157 | } |
158 | } | |
159 | ||
160 | #[test] | |
161 | fn test_ptr_addition() { | |
162 | unsafe { | |
c1a9b12d | 163 | let xs = vec![5; 16]; |
1a4d82fc JJ |
164 | let mut ptr = xs.as_ptr(); |
165 | let end = ptr.offset(16); | |
166 | ||
167 | while ptr < end { | |
168 | assert_eq!(*ptr, 5); | |
169 | ptr = ptr.offset(1); | |
170 | } | |
171 | ||
172 | let mut xs_mut = xs; | |
173 | let mut m_ptr = xs_mut.as_mut_ptr(); | |
174 | let m_end = m_ptr.offset(16); | |
175 | ||
176 | while m_ptr < m_end { | |
177 | *m_ptr += 5; | |
178 | m_ptr = m_ptr.offset(1); | |
179 | } | |
180 | ||
c1a9b12d | 181 | assert!(xs_mut == vec![10; 16]); |
1a4d82fc JJ |
182 | } |
183 | } | |
184 | ||
185 | #[test] | |
186 | fn test_ptr_subtraction() { | |
187 | unsafe { | |
188 | let xs = vec![0,1,2,3,4,5,6,7,8,9]; | |
c34b1796 | 189 | let mut idx = 9; |
1a4d82fc JJ |
190 | let ptr = xs.as_ptr(); |
191 | ||
c34b1796 AL |
192 | while idx >= 0 { |
193 | assert_eq!(*(ptr.offset(idx as isize)), idx as isize); | |
194 | idx = idx - 1; | |
1a4d82fc JJ |
195 | } |
196 | ||
197 | let mut xs_mut = xs; | |
198 | let m_start = xs_mut.as_mut_ptr(); | |
199 | let mut m_ptr = m_start.offset(9); | |
200 | ||
201 | while m_ptr >= m_start { | |
202 | *m_ptr += *m_ptr; | |
203 | m_ptr = m_ptr.offset(-1); | |
204 | } | |
205 | ||
c34b1796 | 206 | assert_eq!(xs_mut, [0,2,4,6,8,10,12,14,16,18]); |
1a4d82fc JJ |
207 | } |
208 | } | |
209 | ||
210 | #[test] | |
211 | fn test_set_memory() { | |
212 | let mut xs = [0u8; 20]; | |
213 | let ptr = xs.as_mut_ptr(); | |
c34b1796 | 214 | unsafe { write_bytes(ptr, 5u8, xs.len()); } |
1a4d82fc JJ |
215 | assert!(xs == [5u8; 20]); |
216 | } | |
85aaf69f SL |
217 | |
218 | #[test] | |
219 | fn test_unsized_unique() { | |
7cac9316 | 220 | let xs: &[i32] = &[1, 2, 3]; |
3b2f2976 | 221 | let ptr = unsafe { Unique::new_unchecked(xs as *const [i32] as *mut [i32]) }; |
7cac9316 XL |
222 | let ys = unsafe { ptr.as_ref() }; |
223 | let zs: &[i32] = &[1, 2, 3]; | |
85aaf69f SL |
224 | assert!(ys == zs); |
225 | } | |
5bcae85e SL |
226 | |
227 | #[test] | |
9e0c209e SL |
228 | #[allow(warnings)] |
229 | // Have a symbol for the test below. It doesn’t need to be an actual variadic function, match the | |
230 | // ABI, or even point to an actual executable code, because the function itself is never invoked. | |
231 | #[no_mangle] | |
232 | pub fn test_variadic_fnptr() { | |
5bcae85e | 233 | use core::hash::{Hash, SipHasher}; |
9e0c209e SL |
234 | extern { |
235 | fn test_variadic_fnptr(_: u64, ...) -> f64; | |
5bcae85e | 236 | } |
9e0c209e | 237 | let p: unsafe extern fn(u64, ...) -> f64 = test_variadic_fnptr; |
5bcae85e SL |
238 | let q = p.clone(); |
239 | assert_eq!(p, q); | |
240 | assert!(!(p < q)); | |
241 | let mut s = SipHasher::new(); | |
242 | assert_eq!(p.hash(&mut s), q.hash(&mut s)); | |
243 | } | |
476ff2be SL |
244 | |
245 | #[test] | |
246 | fn write_unaligned_drop() { | |
247 | thread_local! { | |
248 | static DROPS: RefCell<Vec<u32>> = RefCell::new(Vec::new()); | |
249 | } | |
250 | ||
251 | struct Dropper(u32); | |
252 | ||
253 | impl Drop for Dropper { | |
254 | fn drop(&mut self) { | |
255 | DROPS.with(|d| d.borrow_mut().push(self.0)); | |
256 | } | |
257 | } | |
258 | ||
259 | { | |
260 | let c = Dropper(0); | |
261 | let mut t = Dropper(1); | |
262 | unsafe { write_unaligned(&mut t, c); } | |
263 | } | |
264 | DROPS.with(|d| assert_eq!(*d.borrow(), [0])); | |
265 | } |