126 lines
3.4 KiB
Rust
126 lines
3.4 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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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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use libc::{c_void, size_t, free, malloc, realloc};
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use ptr::{RawPtr, mut_null};
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use unstable::intrinsics::abort;
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use unstable::raw;
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use mem::size_of;
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#[inline]
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pub fn get_box_size(body_size: uint, body_align: uint) -> uint {
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let header_size = size_of::<raw::Box<()>>();
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let total_size = align_to(header_size, body_align) + body_size;
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total_size
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}
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// Rounds |size| to the nearest |alignment|. Invariant: |alignment| is a power
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// of two.
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#[inline]
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fn align_to(size: uint, align: uint) -> uint {
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assert!(align != 0);
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(size + align - 1) & !(align - 1)
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}
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/// A wrapper around libc::malloc, aborting on out-of-memory
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#[inline]
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pub unsafe fn malloc_raw(size: uint) -> *mut u8 {
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// `malloc(0)` may allocate, but it may also return a null pointer
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// http://pubs.opengroup.org/onlinepubs/9699919799/functions/malloc.html
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if size == 0 {
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mut_null()
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} else {
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let p = malloc(size as size_t);
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if p.is_null() {
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// we need a non-allocating way to print an error here
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abort();
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}
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p as *mut u8
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}
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}
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/// A wrapper around libc::realloc, aborting on out-of-memory
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#[inline]
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pub unsafe fn realloc_raw(ptr: *mut u8, size: uint) -> *mut u8 {
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// `realloc(ptr, 0)` may allocate, but it may also return a null pointer
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// http://pubs.opengroup.org/onlinepubs/9699919799/functions/realloc.html
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if size == 0 {
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free(ptr as *mut c_void);
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mut_null()
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} else {
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let p = realloc(ptr as *mut c_void, size as size_t);
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if p.is_null() {
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// we need a non-allocating way to print an error here
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abort();
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}
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p as *mut u8
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}
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}
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/// The allocator for unique pointers without contained managed pointers.
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#[cfg(not(test))]
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#[lang="exchange_malloc"]
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#[inline]
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pub unsafe fn exchange_malloc(size: uint) -> *u8 {
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malloc_raw(size) as *u8
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}
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// FIXME: #7496
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#[cfg(not(test))]
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#[lang="closure_exchange_malloc"]
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#[inline]
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pub unsafe fn closure_exchange_malloc_(drop_glue: fn(*mut u8), size: uint, align: uint) -> *u8 {
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closure_exchange_malloc(drop_glue, size, align)
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}
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#[inline]
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pub unsafe fn closure_exchange_malloc(drop_glue: fn(*mut u8), size: uint, align: uint) -> *u8 {
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let total_size = get_box_size(size, align);
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let p = malloc_raw(total_size);
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let alloc = p as *mut raw::Box<()>;
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(*alloc).drop_glue = drop_glue;
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alloc as *u8
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}
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// NB: Calls to free CANNOT be allowed to fail, as throwing an exception from
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// inside a landing pad may corrupt the state of the exception handler.
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#[cfg(not(test))]
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#[lang="exchange_free"]
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#[inline]
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pub unsafe fn exchange_free_(ptr: *u8) {
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exchange_free(ptr)
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}
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#[inline]
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pub unsafe fn exchange_free(ptr: *u8) {
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free(ptr as *mut c_void);
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}
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#[cfg(test)]
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mod bench {
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use extra::test::BenchHarness;
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#[bench]
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fn alloc_owned_small(bh: &mut BenchHarness) {
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bh.iter(|| {
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~10
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})
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}
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#[bench]
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fn alloc_owned_big(bh: &mut BenchHarness) {
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bh.iter(|| {
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~[10, ..1000]
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})
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}
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}
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