2014-12-13 00:39:27 +01:00
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// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
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2014-04-25 08:19:34 +02:00
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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2017-06-03 23:54:08 +02:00
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#![unstable(feature = "allocator_api",
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2015-06-09 20:52:41 +02:00
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reason = "the precise API and guarantees it provides may be tweaked \
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slightly, especially to possibly take into account the \
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types being stored to make room for a future \
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2015-08-13 07:19:08 +02:00
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tracing garbage collector",
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2017-06-03 23:54:08 +02:00
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issue = "32838")]
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2015-06-09 20:52:41 +02:00
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2016-11-11 11:55:47 +01:00
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use core::intrinsics::{min_align_of_val, size_of_val};
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2018-04-20 03:24:53 +02:00
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use core::ptr::{NonNull, Unique};
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2017-06-03 23:54:08 +02:00
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use core::usize;
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2015-02-08 00:49:54 +01:00
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2018-04-02 10:38:07 +02:00
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#[doc(inline)]
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2018-04-03 21:05:10 +02:00
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pub use core::alloc::*;
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2018-04-02 10:38:07 +02:00
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2018-04-03 17:12:57 +02:00
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#[cfg(stage0)]
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2017-06-03 23:54:08 +02:00
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extern "Rust" {
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#[allocator]
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#[rustc_allocator_nounwind]
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fn __rust_alloc(size: usize, align: usize, err: *mut u8) -> *mut u8;
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#[cold]
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#[rustc_allocator_nounwind]
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fn __rust_oom(err: *const u8) -> !;
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#[rustc_allocator_nounwind]
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fn __rust_dealloc(ptr: *mut u8, size: usize, align: usize);
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#[rustc_allocator_nounwind]
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fn __rust_realloc(ptr: *mut u8,
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old_size: usize,
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old_align: usize,
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new_size: usize,
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new_align: usize,
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err: *mut u8) -> *mut u8;
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#[rustc_allocator_nounwind]
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fn __rust_alloc_zeroed(size: usize, align: usize, err: *mut u8) -> *mut u8;
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}
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#[cfg(not(stage0))]
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extern "Rust" {
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#[allocator]
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#[rustc_allocator_nounwind]
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fn __rust_alloc(size: usize, align: usize) -> *mut u8;
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#[rustc_allocator_nounwind]
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fn __rust_dealloc(ptr: *mut u8, size: usize, align: usize);
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#[rustc_allocator_nounwind]
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fn __rust_realloc(ptr: *mut u8,
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old_size: usize,
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align: usize,
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new_size: usize) -> *mut u8;
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#[rustc_allocator_nounwind]
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fn __rust_alloc_zeroed(size: usize, align: usize) -> *mut u8;
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2015-02-08 00:49:54 +01:00
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}
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2017-05-23 14:47:41 +02:00
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#[derive(Copy, Clone, Default, Debug)]
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pub struct Global;
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2018-04-03 14:43:34 +02:00
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#[unstable(feature = "allocator_api", issue = "32838")]
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#[rustc_deprecated(since = "1.27.0", reason = "type renamed to `Global`")]
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pub type Heap = Global;
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#[unstable(feature = "allocator_api", issue = "32838")]
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#[rustc_deprecated(since = "1.27.0", reason = "type renamed to `Global`")]
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#[allow(non_upper_case_globals)]
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pub const Heap: Global = Global;
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2018-04-04 19:15:22 +02:00
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unsafe impl GlobalAlloc for Global {
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#[inline]
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unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
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#[cfg(not(stage0))]
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let ptr = __rust_alloc(layout.size(), layout.align());
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#[cfg(stage0)]
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let ptr = __rust_alloc(layout.size(), layout.align(), &mut 0);
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ptr as *mut Opaque
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}
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#[inline]
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unsafe fn dealloc(&self, ptr: *mut Opaque, layout: Layout) {
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__rust_dealloc(ptr as *mut u8, layout.size(), layout.align())
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}
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2017-06-03 23:54:08 +02:00
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#[inline]
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unsafe fn realloc(&self, ptr: *mut Opaque, layout: Layout, new_size: usize) -> *mut Opaque {
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2018-04-04 17:19:16 +02:00
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#[cfg(not(stage0))]
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2018-04-04 19:15:22 +02:00
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let ptr = __rust_realloc(ptr as *mut u8, layout.size(), layout.align(), new_size);
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#[cfg(stage0)]
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let ptr = __rust_realloc(ptr as *mut u8, layout.size(), layout.align(),
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new_size, layout.align(), &mut 0);
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ptr as *mut Opaque
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}
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2017-06-03 23:54:08 +02:00
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#[inline]
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unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque {
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#[cfg(not(stage0))]
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let ptr = __rust_alloc_zeroed(layout.size(), layout.align());
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#[cfg(stage0)]
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let ptr = __rust_alloc_zeroed(layout.size(), layout.align(), &mut 0);
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ptr as *mut Opaque
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}
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2014-05-11 23:41:15 +02:00
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}
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2018-04-04 19:15:22 +02:00
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unsafe impl Alloc for Global {
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#[inline]
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unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
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NonNull::new(GlobalAlloc::alloc(self, layout)).ok_or(AllocErr)
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}
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#[inline]
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unsafe fn dealloc(&mut self, ptr: NonNull<Opaque>, layout: Layout) {
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GlobalAlloc::dealloc(self, ptr.as_ptr(), layout)
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}
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#[inline]
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unsafe fn realloc(&mut self,
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ptr: NonNull<Opaque>,
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layout: Layout,
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new_size: usize)
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-> Result<NonNull<Opaque>, AllocErr>
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{
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NonNull::new(GlobalAlloc::realloc(self, ptr.as_ptr(), layout, new_size)).ok_or(AllocErr)
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}
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#[inline]
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unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<Opaque>, AllocErr> {
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NonNull::new(GlobalAlloc::alloc_zeroed(self, layout)).ok_or(AllocErr)
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}
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}
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2014-05-07 04:03:14 +02:00
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/// The allocator for unique pointers.
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2016-12-16 02:00:19 +01:00
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// This function must not unwind. If it does, MIR trans will fail.
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2014-05-12 08:51:00 +02:00
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#[cfg(not(test))]
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2015-05-09 21:50:28 +02:00
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#[lang = "exchange_malloc"]
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2014-05-07 04:03:14 +02:00
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#[inline]
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2015-02-09 08:00:46 +01:00
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unsafe fn exchange_malloc(size: usize, align: usize) -> *mut u8 {
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if size == 0 {
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align as *mut u8
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} else {
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let layout = Layout::from_size_align_unchecked(size, align);
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let ptr = Global.alloc(layout);
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if !ptr.is_null() {
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ptr as *mut u8
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} else {
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2018-04-21 06:05:13 +02:00
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oom()
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}
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2014-05-07 04:03:14 +02:00
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}
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}
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2018-04-20 03:24:53 +02:00
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#[cfg(stage0)]
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#[lang = "box_free"]
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#[inline]
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unsafe fn old_box_free<T: ?Sized>(ptr: *mut T) {
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box_free(Unique::new_unchecked(ptr))
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}
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#[cfg_attr(not(any(test, stage0)), lang = "box_free")]
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2016-01-28 22:59:00 +01:00
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#[inline]
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pub(crate) unsafe fn box_free<T: ?Sized>(ptr: Unique<T>) {
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let ptr = ptr.as_ptr();
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let size = size_of_val(&*ptr);
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let align = min_align_of_val(&*ptr);
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2016-01-28 22:59:00 +01:00
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// We do not allocate for Box<T> when T is ZST, so deallocation is also not necessary.
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if size != 0 {
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let layout = Layout::from_size_align_unchecked(size, align);
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Global.dealloc(ptr as *mut Opaque, layout);
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2016-01-28 22:59:00 +01:00
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}
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}
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2018-04-21 06:05:13 +02:00
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#[cfg(stage0)]
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pub fn oom() -> ! {
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unsafe { ::core::intrinsics::abort() }
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}
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#[cfg(not(stage0))]
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pub fn oom() -> ! {
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extern {
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#[lang = "oom"]
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fn oom_impl() -> !;
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}
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unsafe { oom_impl() }
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}
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2014-05-07 04:03:14 +02:00
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#[cfg(test)]
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2015-04-24 17:30:41 +02:00
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mod tests {
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extern crate test;
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use self::test::Bencher;
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use boxed::Box;
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use alloc::{Global, Alloc, Layout, oom};
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2017-03-10 02:53:01 +01:00
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#[test]
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fn allocate_zeroed() {
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unsafe {
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let layout = Layout::from_size_align(1024, 1).unwrap();
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let ptr = Global.alloc_zeroed(layout.clone())
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.unwrap_or_else(|_| oom());
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2018-04-03 01:51:02 +02:00
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let mut i = ptr.cast::<u8>().as_ptr();
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let end = i.offset(layout.size() as isize);
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while i < end {
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assert_eq!(*i, 0);
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i = i.offset(1);
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}
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Global.dealloc(ptr, layout);
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2014-10-02 09:29:39 +02:00
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}
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}
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2014-05-07 04:03:14 +02:00
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#[bench]
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fn alloc_owned_small(b: &mut Bencher) {
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b.iter(|| {
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let _: Box<_> = box 10;
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})
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}
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}
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