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// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![allow(deprecated)]
pub use alloc::{Layout, AllocErr, CannotReallocInPlace, Opaque};
use core::alloc::Alloc as CoreAlloc;
use core::ptr::NonNull;
#[doc(hidden)]
pub mod __core {
pub use core::*;
}
#[derive(Debug)]
pub struct Excess(pub *mut u8, pub usize);
/// Compatibility with older versions of #[global_allocator] during bootstrap
pub unsafe trait Alloc {
unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr>;
unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout);
fn oom(&mut self, err: AllocErr) -> !;
fn usable_size(&self, layout: &Layout) -> (usize, usize);
unsafe fn realloc(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<*mut u8, AllocErr>;
unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<*mut u8, AllocErr>;
unsafe fn alloc_excess(&mut self, layout: Layout) -> Result<Excess, AllocErr>;
unsafe fn realloc_excess(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<Excess, AllocErr>;
unsafe fn grow_in_place(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<(), CannotReallocInPlace>;
unsafe fn shrink_in_place(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<(), CannotReallocInPlace>;
}
unsafe impl<T> Alloc for T where T: CoreAlloc {
unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
CoreAlloc::alloc(self, layout).map(|ptr| ptr.cast().as_ptr())
}
unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
CoreAlloc::dealloc(self, ptr, layout)
}
fn oom(&mut self, _: AllocErr) -> ! {
unsafe { ::core::intrinsics::abort() }
}
fn usable_size(&self, layout: &Layout) -> (usize, usize) {
CoreAlloc::usable_size(self, layout)
}
unsafe fn realloc(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<*mut u8, AllocErr> {
let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
CoreAlloc::realloc(self, ptr, layout, new_layout.size()).map(|ptr| ptr.cast().as_ptr())
}
unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
CoreAlloc::alloc_zeroed(self, layout).map(|ptr| ptr.cast().as_ptr())
}
unsafe fn alloc_excess(&mut self, layout: Layout) -> Result<Excess, AllocErr> {
CoreAlloc::alloc_excess(self, layout)
.map(|e| Excess(e.0 .cast().as_ptr(), e.1))
}
unsafe fn realloc_excess(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<Excess, AllocErr> {
let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
CoreAlloc::realloc_excess(self, ptr, layout, new_layout.size())
.map(|e| Excess(e.0 .cast().as_ptr(), e.1))
}
unsafe fn grow_in_place(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<(), CannotReallocInPlace> {
let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
CoreAlloc::grow_in_place(self, ptr, layout, new_layout.size())
}
unsafe fn shrink_in_place(&mut self,
ptr: *mut u8,
layout: Layout,
new_layout: Layout) -> Result<(), CannotReallocInPlace> {
let ptr = NonNull::new_unchecked(ptr as *mut Opaque);
CoreAlloc::shrink_in_place(self, ptr, layout, new_layout.size())
}
}
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