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pub(crate) use self::inner::{do_alloc, Allocator, Global};
#[cfg(feature = "nightly")]
mod inner {
use crate::alloc::alloc::Layout;
pub use crate::alloc::alloc::{Allocator, Global};
use core::ptr::NonNull;
#[allow(clippy::map_err_ignore)]
pub 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),
}
}
#[inline]
unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: Layout) {}
}
}
#[cfg(not(feature = "nightly"))]
mod inner {
use crate::alloc::alloc::{alloc, dealloc, Layout};
use core::ptr::NonNull;
#[allow(clippy::missing_safety_doc)] // not exposed outside of this crate
pub unsafe trait Allocator {
fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()>;
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout);
}
#[derive(Copy, Clone)]
pub struct Global;
unsafe impl Allocator for Global {
#[inline]
fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()> {
unsafe { NonNull::new(alloc(layout)).ok_or(()) }
}
#[inline]
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
dealloc(ptr.as_ptr(), layout);
}
}
impl Default for Global {
#[inline]
fn default() -> Self {
Global
}
}
pub 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) {}
}
}
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