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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-12 05:43:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-12 05:43:14 +0000 |
commit | 8dd16259287f58f9273002717ec4d27e97127719 (patch) | |
tree | 3863e62a53829a84037444beab3abd4ed9dfc7d0 /third_party/rust/hashbrown/src/raw/alloc.rs | |
parent | Releasing progress-linux version 126.0.1-1~progress7.99u1. (diff) | |
download | firefox-8dd16259287f58f9273002717ec4d27e97127719.tar.xz firefox-8dd16259287f58f9273002717ec4d27e97127719.zip |
Merging upstream version 127.0.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/hashbrown/src/raw/alloc.rs')
-rw-r--r-- | third_party/rust/hashbrown/src/raw/alloc.rs | 57 |
1 files changed, 35 insertions, 22 deletions
diff --git a/third_party/rust/hashbrown/src/raw/alloc.rs b/third_party/rust/hashbrown/src/raw/alloc.rs index ba09ea9de7..15299e7b09 100644 --- a/third_party/rust/hashbrown/src/raw/alloc.rs +++ b/third_party/rust/hashbrown/src/raw/alloc.rs @@ -1,5 +1,9 @@ pub(crate) use self::inner::{do_alloc, Allocator, Global}; +// Nightly-case. +// Use unstable `allocator_api` feature. +// This is compatible with `allocator-api2` which can be enabled or not. +// This is used when building for `std`. #[cfg(feature = "nightly")] mod inner { use crate::alloc::alloc::Layout; @@ -7,28 +11,44 @@ mod inner { use core::ptr::NonNull; #[allow(clippy::map_err_ignore)] - pub fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> { + pub(crate) fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> { match alloc.allocate(layout) { Ok(ptr) => Ok(ptr.as_non_null_ptr()), Err(_) => Err(()), } } +} - #[cfg(feature = "bumpalo")] - unsafe impl Allocator for crate::BumpWrapper<'_> { - #[inline] - fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, core::alloc::AllocError> { - match self.0.try_alloc_layout(layout) { - Ok(ptr) => Ok(NonNull::slice_from_raw_parts(ptr, layout.size())), - Err(_) => Err(core::alloc::AllocError), - } +// Basic non-nightly case. +// This uses `allocator-api2` enabled by default. +// If any crate enables "nightly" in `allocator-api2`, +// this will be equivalent to the nightly case, +// since `allocator_api2::alloc::Allocator` would be re-export of +// `core::alloc::Allocator`. +#[cfg(all(not(feature = "nightly"), feature = "allocator-api2"))] +mod inner { + use crate::alloc::alloc::Layout; + pub use allocator_api2::alloc::{Allocator, Global}; + use core::ptr::NonNull; + + #[allow(clippy::map_err_ignore)] + pub(crate) fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> { + match alloc.allocate(layout) { + Ok(ptr) => Ok(ptr.cast()), + Err(_) => Err(()), } - #[inline] - unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: Layout) {} } } -#[cfg(not(feature = "nightly"))] +// No-defaults case. +// When building with default-features turned off and +// neither `nightly` nor `allocator-api2` is enabled, +// this will be used. +// Making it impossible to use any custom allocator with collections defined +// in this crate. +// Any crate in build-tree can enable `allocator-api2`, +// or `nightly` without disturbing users that don't want to use it. +#[cfg(not(any(feature = "nightly", feature = "allocator-api2")))] mod inner { use crate::alloc::alloc::{alloc, dealloc, Layout}; use core::ptr::NonNull; @@ -41,6 +61,7 @@ mod inner { #[derive(Copy, Clone)] pub struct Global; + unsafe impl Allocator for Global { #[inline] fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()> { @@ -51,6 +72,7 @@ mod inner { dealloc(ptr.as_ptr(), layout); } } + impl Default for Global { #[inline] fn default() -> Self { @@ -58,16 +80,7 @@ mod inner { } } - pub fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> { + pub(crate) fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> { alloc.allocate(layout) } - - #[cfg(feature = "bumpalo")] - unsafe impl Allocator for crate::BumpWrapper<'_> { - #[allow(clippy::map_err_ignore)] - fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()> { - self.0.try_alloc_layout(layout).map_err(|_| ()) - } - unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: Layout) {} - } } |