1 // compile-flags: -Zmiri-track-raw-pointers
2 // ignore-windows (FIXME: tracking raw pointers does not work on Windows)
3 // Gather all references from a mutable iterator and make sure Miri notices if
4 // using them is dangerous.
5 fn test_all_refs<'a, T: 'a>(dummy: &mut T, iter: impl Iterator<Item = &'a mut T>) {
6 // Gather all those references.
7 let mut refs: Vec<&mut T> = iter.collect();
8 // Use them all. Twice, to be sure we got all interleavings.
9 for r in refs.iter_mut() {
10 std::mem::swap(dummy, r);
13 std::mem::swap(dummy, r);
17 fn make_vec() -> Vec<u8> {
18 let mut v = Vec::with_capacity(4);
24 fn make_vec_macro() -> Vec<u8> {
28 fn make_vec_macro_repeat() -> Vec<u8> {
32 fn make_vec_macro_repeat_zeroed() -> Vec<u8> {
36 fn vec_into_iter() -> u8 {
40 .fold(0, |x, y| x + y)
43 fn vec_into_iter_rev() -> u8 {
47 .fold(0, |x, y| x + y)
50 fn vec_into_iter_zst() -> usize {
51 vec![[0u64; 0], [0u64; 0]]
58 fn vec_into_iter_rev_zst() -> usize {
59 vec![[0u64; 0], [0u64; 0]]
66 fn vec_iter_and_mut() {
67 let mut v = vec![1,2,3,4];
68 for i in v.iter_mut() {
71 assert_eq!(v.iter().sum::<i32>(), 2+3+4+5);
73 test_all_refs(&mut 13, v.iter_mut());
76 fn vec_iter_and_mut_rev() {
77 let mut v = vec![1,2,3,4];
78 for i in v.iter_mut().rev() {
81 assert_eq!(v.iter().sum::<i32>(), 2+3+4+5);
84 fn vec_reallocate() -> Vec<u8> {
85 let mut v = vec![1, 2];
92 fn vec_push_ptr_stable() {
93 let mut v = Vec::with_capacity(10);
95 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
100 fn vec_extend_ptr_stable() {
101 let mut v = Vec::with_capacity(10);
103 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
104 // `slice::Iter` (with `T: Copy`) specialization
107 // `vec::IntoIter` specialization
110 // `TrustedLen` specialization
111 v.extend(std::iter::once(3));
114 v.extend(std::iter::once(3).filter(|_| true));
118 fn vec_truncate_ptr_stable() {
119 let mut v = vec![0; 10];
120 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
125 fn push_str_ptr_stable() {
126 let mut buf = String::with_capacity(11);
127 buf.push_str("hello");
128 let hello: &str = unsafe { &*(buf.as_str() as *const _) }; // laundering the lifetime -- we take care that `buf` does not reallocate, so that's okay.
129 buf.push_str(" world");
130 assert_eq!(format!("{}", hello), "hello");
134 assert_eq!(vec_reallocate().len(), 5);
136 assert_eq!(vec_into_iter(), 30);
137 assert_eq!(vec_into_iter_rev(), 30);
139 assert_eq!(vec_into_iter_zst(), 0);
140 assert_eq!(vec_into_iter_rev_zst(), 0);
141 vec_iter_and_mut_rev();
143 assert_eq!(make_vec().capacity(), 4);
144 assert_eq!(make_vec_macro(), [1, 2]);
145 assert_eq!(make_vec_macro_repeat(), [42; 5]);
146 assert_eq!(make_vec_macro_repeat_zeroed(), [0; 7]);
148 // Test interesting empty slice comparison
149 // (one is a real pointer, one an integer pointer).
150 assert_eq!((200..-5).step_by(1).collect::<Vec<isize>>(), []);
152 // liballoc has a more extensive test of this, but let's at least do a smoke test here.
153 vec_push_ptr_stable();
154 vec_extend_ptr_stable();
155 vec_truncate_ptr_stable();
156 push_str_ptr_stable();