1 //@compile-flags: -Zmiri-strict-provenance
2 #![feature(iter_advance_by, iter_next_chunk)]
4 // Gather all references from a mutable iterator and make sure Miri notices if
5 // using them is dangerous.
6 fn test_all_refs<'a, T: 'a>(dummy: &mut T, iter: impl Iterator<Item = &'a mut T>) {
7 // Gather all those references.
8 let mut refs: Vec<&mut T> = iter.collect();
9 // Use them all. Twice, to be sure we got all interleavings.
10 for r in refs.iter_mut() {
11 std::mem::swap(dummy, r);
14 std::mem::swap(dummy, r);
18 fn make_vec() -> Vec<u8> {
19 let mut v = Vec::with_capacity(4);
25 fn make_vec_macro() -> Vec<u8> {
29 fn make_vec_macro_repeat() -> Vec<u8> {
33 fn make_vec_macro_repeat_zeroed() -> Vec<u8> {
37 fn vec_into_iter() -> u8 {
38 vec![1, 2, 3, 4].into_iter().map(|x| x * x).fold(0, |x, y| x + y)
41 fn vec_into_iter_rev() -> u8 {
42 vec![1, 2, 3, 4].into_iter().rev().map(|x| x * x).fold(0, |x, y| x + y)
45 fn vec_into_iter_zst() {
46 for _ in vec![[0u64; 0]].into_iter() {}
47 let v = vec![[0u64; 0], [0u64; 0]].into_iter().map(|x| x.len()).sum::<usize>();
50 let mut it = vec![[0u64; 0], [0u64; 0]].into_iter();
51 it.advance_by(1).unwrap();
54 let mut it = vec![[0u64; 0], [0u64; 0]].into_iter();
55 it.next_chunk::<1>().unwrap();
58 let mut it = vec![[0u64; 0], [0u64; 0]].into_iter();
59 it.next_chunk::<4>().unwrap_err();
63 fn vec_into_iter_rev_zst() {
64 for _ in vec![[0u64; 0]; 5].into_iter().rev() {}
65 let v = vec![[0u64; 0], [0u64; 0]].into_iter().rev().map(|x| x.len()).sum::<usize>();
69 fn vec_iter_and_mut() {
70 let mut v = vec![1, 2, 3, 4];
71 for i in v.iter_mut() {
74 assert_eq!(v.iter().sum::<i32>(), 2 + 3 + 4 + 5);
76 test_all_refs(&mut 13, v.iter_mut());
79 fn vec_iter_and_mut_rev() {
80 let mut v = vec![1, 2, 3, 4];
81 for i in v.iter_mut().rev() {
84 assert_eq!(v.iter().sum::<i32>(), 2 + 3 + 4 + 5);
87 fn vec_reallocate() -> Vec<u8> {
88 let mut v = vec![1, 2];
95 fn vec_push_ptr_stable() {
96 let mut v = Vec::with_capacity(10);
98 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
103 fn vec_extend_ptr_stable() {
104 let mut v = Vec::with_capacity(10);
106 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
107 // `slice::Iter` (with `T: Copy`) specialization
110 // `vec::IntoIter` specialization
113 // `TrustedLen` specialization
114 v.extend(std::iter::once(3));
117 v.extend(std::iter::once(3).filter(|_| true));
121 fn vec_truncate_ptr_stable() {
122 let mut v = vec![0; 10];
123 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
128 fn push_str_ptr_stable() {
129 let mut buf = String::with_capacity(11);
130 buf.push_str("hello");
131 let hello: &str = unsafe { &*(buf.as_str() as *const _) }; // laundering the lifetime -- we take care that `buf` does not reallocate, so that's okay.
132 buf.push_str(" world");
133 assert_eq!(format!("{}", hello), "hello");
137 let mut v = vec![1; 20];
143 let mut v = vec![1, 2, 3, 4];
150 let mut vec = vec![&mut a, &mut b];
160 let mut v: Vec<_> = (0..50).map(Foo).collect();
162 assert!(v[0].0 == 49);
166 assert_eq!(vec_reallocate().len(), 5);
168 assert_eq!(vec_into_iter(), 30);
169 assert_eq!(vec_into_iter_rev(), 30);
172 vec_into_iter_rev_zst();
173 vec_iter_and_mut_rev();
175 assert_eq!(make_vec().capacity(), 4);
176 assert_eq!(make_vec_macro(), [1, 2]);
177 assert_eq!(make_vec_macro_repeat(), [42; 5]);
178 assert_eq!(make_vec_macro_repeat_zeroed(), [0; 7]);
180 // Test interesting empty slice comparison
181 // (one is a real pointer, one an integer pointer).
182 assert_eq!((200..-5).step_by(1).collect::<Vec<isize>>(), []);
184 // liballoc has a more extensive test of this, but let's at least do a smoke test here.
185 vec_push_ptr_stable();
186 vec_extend_ptr_stable();
187 vec_truncate_ptr_stable();
188 push_str_ptr_stable();