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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /vendor/bytes/tests/test_bytes_odd_alloc.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/bytes/tests/test_bytes_odd_alloc.rs')
-rw-r--r-- | vendor/bytes/tests/test_bytes_odd_alloc.rs | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/vendor/bytes/tests/test_bytes_odd_alloc.rs b/vendor/bytes/tests/test_bytes_odd_alloc.rs new file mode 100644 index 000000000..04ba7c2f1 --- /dev/null +++ b/vendor/bytes/tests/test_bytes_odd_alloc.rs @@ -0,0 +1,69 @@ +//! Test using `Bytes` with an allocator that hands out "odd" pointers for +//! vectors (pointers where the LSB is set). + +#![cfg(not(miri))] // Miri does not support custom allocators (also, Miri is "odd" by default with 50% chance) + +use std::alloc::{GlobalAlloc, Layout, System}; +use std::ptr; + +use bytes::Bytes; + +#[global_allocator] +static ODD: Odd = Odd; + +struct Odd; + +unsafe impl GlobalAlloc for Odd { + unsafe fn alloc(&self, layout: Layout) -> *mut u8 { + if layout.align() == 1 && layout.size() > 0 { + // Allocate slightly bigger so that we can offset the pointer by 1 + let size = layout.size() + 1; + let new_layout = match Layout::from_size_align(size, 1) { + Ok(layout) => layout, + Err(_err) => return ptr::null_mut(), + }; + let ptr = System.alloc(new_layout); + if !ptr.is_null() { + let ptr = ptr.offset(1); + ptr + } else { + ptr + } + } else { + System.alloc(layout) + } + } + + unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) { + if layout.align() == 1 && layout.size() > 0 { + let size = layout.size() + 1; + let new_layout = match Layout::from_size_align(size, 1) { + Ok(layout) => layout, + Err(_err) => std::process::abort(), + }; + System.dealloc(ptr.offset(-1), new_layout); + } else { + System.dealloc(ptr, layout); + } + } +} + +#[test] +fn sanity_check_odd_allocator() { + let vec = vec![33u8; 1024]; + let p = vec.as_ptr() as usize; + assert!(p & 0x1 == 0x1, "{:#b}", p); +} + +#[test] +fn test_bytes_from_vec_drop() { + let vec = vec![33u8; 1024]; + let _b = Bytes::from(vec); +} + +#[test] +fn test_bytes_clone_drop() { + let vec = vec![33u8; 1024]; + let b1 = Bytes::from(vec); + let _b2 = b1.clone(); +} |