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android: use posix_memalign for aligned allocations #125244

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May 18, 2024
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android: use posix_memalign for aligned allocations #125244

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19 changes: 1 addition & 18 deletions library/std/src/sys/pal/unix/alloc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -59,32 +59,15 @@ unsafe impl GlobalAlloc for System {
}

cfg_if::cfg_if! {
// We use posix_memalign wherever possible, but not all targets have that function.
if #[cfg(any(
target_os = "android",
target_os = "redox",
target_os = "espidf",
target_os = "horizon",
target_os = "vita",
))] {
#[inline]
unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
// On android we currently target API level 9 which unfortunately
// doesn't have the `posix_memalign` API used below. Instead we use
// `memalign`, but this unfortunately has the property on some systems
// where the memory returned cannot be deallocated by `free`!
//
// Upon closer inspection, however, this appears to work just fine with
// Android, so for this platform we should be fine to call `memalign`
// (which is present in API level 9). Some helpful references could
// possibly be chromium using memalign [1], attempts at documenting that
// memalign + free is ok [2] [3], or the current source of chromium
// which still uses memalign on android [4].
//
// [1]: https://codereview.chromium.org/10796020/
// [2]: https://code.google.com/p/android/issues/detail?id=35391
// [3]: https://bugs.chromium.org/p/chromium/issues/detail?id=138579
// [4]: https://chromium.googlesource.com/chromium/src/base/+/master/
// /memory/aligned_memory.cc
libc::memalign(layout.align(), layout.size()) as *mut u8
}
} else {
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