32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
use core::alloc::Layout;
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use core::ptr::{self, NonNull};
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#[test]
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fn const_unchecked_layout() {
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const SIZE: usize = 0x2000;
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const ALIGN: usize = 0x1000;
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const LAYOUT: Layout = unsafe { Layout::from_size_align_unchecked(SIZE, ALIGN) };
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const DANGLING: NonNull<u8> = LAYOUT.dangling();
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assert_eq!(LAYOUT.size(), SIZE);
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assert_eq!(LAYOUT.align(), ALIGN);
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assert_eq!(Some(DANGLING), NonNull::new(ptr::invalid_mut(ALIGN)));
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}
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#[test]
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fn layout_debug_shows_log2_of_alignment() {
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// `Debug` is not stable, but here's what it does right now
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let layout = Layout::from_size_align(24576, 8192).unwrap();
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let s = format!("{:?}", layout);
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assert_eq!(s, "Layout { size: 24576, align: 8192 (1 << 13) }");
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}
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// Running this normally doesn't do much, but it's also run in Miri, which
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// will double-check that these are allowed by the validity invariants.
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#[test]
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fn layout_accepts_all_valid_alignments() {
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for align in 0..usize::BITS {
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let layout = Layout::from_size_align(0, 1_usize << align).unwrap();
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assert_eq!(layout.align(), 1_usize << align);
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}
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}
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