1 use std::alloc::{Allocator, Global, Layout, System};
2
3 /// Issue #45955 and #62251.
4 #[test]
alloc_system_overaligned_request()5 fn alloc_system_overaligned_request() {
6 check_overalign_requests(System)
7 }
8
9 #[test]
std_heap_overaligned_request()10 fn std_heap_overaligned_request() {
11 check_overalign_requests(Global)
12 }
13
check_overalign_requests<T: Allocator>(allocator: T)14 fn check_overalign_requests<T: Allocator>(allocator: T) {
15 for &align in &[4, 8, 16, 32] {
16 // less than and bigger than `MIN_ALIGN`
17 for &size in &[align / 2, align - 1] {
18 // size less than alignment
19 let iterations = 128;
20 unsafe {
21 let pointers: Vec<_> = (0..iterations)
22 .map(|_| {
23 allocator.allocate(Layout::from_size_align(size, align).unwrap()).unwrap()
24 })
25 .collect();
26 for &ptr in &pointers {
27 assert_eq!(
28 (ptr.as_non_null_ptr().as_ptr() as usize) % align,
29 0,
30 "Got a pointer less aligned than requested"
31 )
32 }
33
34 // Clean up
35 for &ptr in &pointers {
36 allocator.deallocate(
37 ptr.as_non_null_ptr(),
38 Layout::from_size_align(size, align).unwrap(),
39 )
40 }
41 }
42 }
43 }
44 }
45