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Add nightly feature flag for Alloc -> AllocRef changes #12

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Add nightly feature flag for Alloc -> AllocRef changes #12

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1 change: 1 addition & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -42,4 +42,5 @@ debug = []

# Enable experimental support for the standard library's unstable allocator API.
allocator-api = []
nightly = []
rustc-dep-of-std = ['core', 'compiler_builtins/rustc-dep-of-std']
50 changes: 48 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,12 @@
#![no_std]
#![deny(missing_docs)]

#[cfg(all(feature = "allocator-api", not(feature = "nightly")))]
use core::alloc::Alloc;
#[cfg(all(feature = "allocator-api", feature = "nightly"))]
use core::alloc::AllocRef;
#[cfg(feature = "allocator-api")]
use core::alloc::{Alloc, AllocErr, Layout};
use core::alloc::{AllocErr, Layout};
use core::cmp;
use core::ptr;

Expand Down Expand Up @@ -130,7 +134,7 @@ impl Dlmalloc {
}
}

#[cfg(feature = "allocator-api")]
#[cfg(all(feature = "allocator-api", not(feature = "nightly")))]
unsafe impl Alloc for Dlmalloc {
#[inline]
unsafe fn alloc(&mut self, layout: Layout) -> Result<ptr::NonNull<u8>, AllocErr> {
Expand Down Expand Up @@ -160,3 +164,45 @@ unsafe impl Alloc for Dlmalloc {
ptr::NonNull::new(ptr).ok_or(AllocErr)
}
}

#[cfg(all(feature = "allocator-api", feature = "nightly"))]
unsafe impl AllocRef for Dlmalloc {
#[inline]
unsafe fn alloc(&mut self, layout: Layout) -> Result<(ptr::NonNull<u8>, usize), AllocErr> {
let layout_size = layout.size();
let ptr = <Dlmalloc>::malloc(self, layout_size, layout.align());
ptr::NonNull::new(ptr)
.ok_or(AllocErr)
.map(|ptr| (ptr, layout_size))
}

#[inline]
unsafe fn dealloc(&mut self, ptr: ptr::NonNull<u8>, layout: Layout) {
<Dlmalloc>::free(self, ptr.as_ptr(), layout.size(), layout.align())
}

#[inline]
unsafe fn realloc(
&mut self,
ptr: ptr::NonNull<u8>,
layout: Layout,
new_size: usize,
) -> Result<(ptr::NonNull<u8>, usize), AllocErr> {
let ptr = <Dlmalloc>::realloc(self, ptr.as_ptr(), layout.size(), layout.align(), new_size);
ptr::NonNull::new(ptr)
.ok_or(AllocErr)
.map(|ptr| (ptr, new_size))
}

#[inline]
unsafe fn alloc_zeroed(
&mut self,
layout: Layout,
) -> Result<(ptr::NonNull<u8>, usize), AllocErr> {
let layout_size = layout.size();
let ptr = <Dlmalloc>::calloc(self, layout_size, layout.align());
ptr::NonNull::new(ptr)
.ok_or(AllocErr)
.map(|ptr| (ptr, layout_size))
}
}