1 // compile-flags: -Zmiri-track-raw-pointers
2 // Gather all references from a mutable iterator and make sure Miri notices if
3 // using them is dangerous.
4 fn test_all_refs<'a, T: 'a>(dummy: &mut T, iter: impl Iterator<Item = &'a mut T>) {
5 // Gather all those references.
6 let mut refs: Vec<&mut T> = iter.collect();
7 // Use them all. Twice, to be sure we got all interleavings.
8 for r in refs.iter_mut() {
9 std::mem::swap(dummy, r);
12 std::mem::swap(dummy, r);
16 fn make_vec() -> Vec<u8> {
17 let mut v = Vec::with_capacity(4);
23 fn make_vec_macro() -> Vec<u8> {
27 fn make_vec_macro_repeat() -> Vec<u8> {
31 fn make_vec_macro_repeat_zeroed() -> Vec<u8> {
35 fn vec_into_iter() -> u8 {
39 .fold(0, |x, y| x + y)
42 fn vec_into_iter_rev() -> u8 {
46 .fold(0, |x, y| x + y)
49 fn vec_into_iter_zst() -> usize {
50 vec![[0u64; 0], [0u64; 0]]
57 fn vec_into_iter_rev_zst() -> usize {
58 vec![[0u64; 0], [0u64; 0]]
65 fn vec_iter_and_mut() {
66 let mut v = vec![1,2,3,4];
67 for i in v.iter_mut() {
70 assert_eq!(v.iter().sum::<i32>(), 2+3+4+5);
72 test_all_refs(&mut 13, v.iter_mut());
75 fn vec_iter_and_mut_rev() {
76 let mut v = vec![1,2,3,4];
77 for i in v.iter_mut().rev() {
80 assert_eq!(v.iter().sum::<i32>(), 2+3+4+5);
83 fn vec_reallocate() -> Vec<u8> {
84 let mut v = vec![1, 2];
91 fn vec_push_ptr_stable() {
92 let mut v = Vec::with_capacity(10);
94 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
99 fn vec_extend_ptr_stable() {
100 let mut v = Vec::with_capacity(10);
102 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 // `slice::Iter` (with `T: Copy`) specialization
106 // `vec::IntoIter` specialization
109 // `TrustedLen` specialization
110 v.extend(std::iter::once(3));
113 v.extend(std::iter::once(3).filter(|_| true));
117 fn vec_truncate_ptr_stable() {
118 let mut v = vec![0; 10];
119 let v0 = unsafe { &mut *(&mut v[0] as *mut _) }; // laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
124 fn push_str_ptr_stable() {
125 let mut buf = String::with_capacity(11);
126 buf.push_str("hello");
127 let hello: &str = unsafe { &*(buf.as_str() as *const _) }; // laundering the lifetime -- we take care that `buf` does not reallocate, so that's okay.
128 buf.push_str(" world");
129 assert_eq!(format!("{}", hello), "hello");
133 assert_eq!(vec_reallocate().len(), 5);
135 assert_eq!(vec_into_iter(), 30);
136 assert_eq!(vec_into_iter_rev(), 30);
138 assert_eq!(vec_into_iter_zst(), 0);
139 assert_eq!(vec_into_iter_rev_zst(), 0);
140 vec_iter_and_mut_rev();
142 assert_eq!(make_vec().capacity(), 4);
143 assert_eq!(make_vec_macro(), [1, 2]);
144 assert_eq!(make_vec_macro_repeat(), [42; 5]);
145 assert_eq!(make_vec_macro_repeat_zeroed(), [0; 7]);
147 // Test interesting empty slice comparison
148 // (one is a real pointer, one an integer pointer).
149 assert_eq!((200..-5).step_by(1).collect::<Vec<isize>>(), []);
151 // liballoc has a more extensive test of this, but let's at least do a smoke test here.
152 vec_push_ptr_stable();
153 vec_extend_ptr_stable();
154 vec_truncate_ptr_stable();
155 push_str_ptr_stable();