File: heap.rs

package info (click to toggle)
rustc-web 1.85.0%2Bdfsg3-1~deb12u3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm-proposed-updates
  • size: 1,759,988 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,056; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (44 lines) | stat: -rw-r--r-- 1,363 bytes parent folder | download | duplicates (14)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
use std::alloc::{Allocator, Global, Layout, System};

/// Issue #45955 and #62251.
#[test]
fn alloc_system_overaligned_request() {
    check_overalign_requests(System)
}

#[test]
fn std_heap_overaligned_request() {
    check_overalign_requests(Global)
}

fn check_overalign_requests<T: Allocator>(allocator: T) {
    for &align in &[4, 8, 16, 32] {
        // less than and bigger than `MIN_ALIGN`
        for &size in &[align / 2, align - 1] {
            // size less than alignment
            let iterations = 128;
            unsafe {
                let pointers: Vec<_> = (0..iterations)
                    .map(|_| {
                        allocator.allocate(Layout::from_size_align(size, align).unwrap()).unwrap()
                    })
                    .collect();
                for &ptr in &pointers {
                    assert_eq!(
                        (ptr.as_non_null_ptr().as_ptr() as usize) % align,
                        0,
                        "Got a pointer less aligned than requested"
                    )
                }

                // Clean up
                for &ptr in &pointers {
                    allocator.deallocate(
                        ptr.as_non_null_ptr(),
                        Layout::from_size_align(size, align).unwrap(),
                    )
                }
            }
        }
    }
}