2014-04-25 08:19:34 +02:00
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// Copyright 2014 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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2014-05-06 23:01:16 +02:00
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// FIXME: #13994: port to the sized deallocation API when available
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// FIXME: #13996: need a way to mark the `allocate` and `reallocate` return values as `noalias`
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2014-04-25 08:19:34 +02:00
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use intrinsics::{abort, cttz32};
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use libc::{c_int, c_void, size_t};
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use ptr::RawPtr;
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#[link(name = "jemalloc", kind = "static")]
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extern {
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fn je_mallocx(size: size_t, flags: c_int) -> *mut c_void;
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fn je_rallocx(ptr: *mut c_void, size: size_t, flags: c_int) -> *mut c_void;
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fn je_xallocx(ptr: *mut c_void, size: size_t, extra: size_t, flags: c_int) -> size_t;
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fn je_dallocx(ptr: *mut c_void, flags: c_int);
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fn je_nallocx(size: size_t, flags: c_int) -> size_t;
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}
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// -lpthread needs to occur after -ljemalloc, the earlier argument isn't enough
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#[cfg(not(windows))]
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#[link(name = "pthread")]
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extern {}
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// MALLOCX_ALIGN(a) macro
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#[inline(always)]
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fn mallocx_align(a: uint) -> c_int { unsafe { cttz32(a as u32) as c_int } }
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/// Return a pointer to `size` bytes of memory.
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///
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/// Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The
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/// alignment must be no larger than the largest supported page size on the platform.
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#[inline]
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pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
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let ptr = je_mallocx(size as size_t, mallocx_align(align)) as *mut u8;
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if ptr.is_null() {
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abort()
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}
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ptr
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}
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/// Extend or shrink the allocation referenced by `ptr` to `size` bytes of memory.
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///
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/// Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The
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/// alignment must be no larger than the largest supported page size on the platform.
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///
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/// The `old_size` and `align` parameters are the parameters that were used to create the
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/// allocation referenced by `ptr`. The `old_size` parameter may also be the value returned by
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/// `usable_size` for the requested size.
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#[inline]
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#[allow(unused_variable)] // for the parameter names in the documentation
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pub unsafe fn reallocate(ptr: *mut u8, size: uint, align: uint, old_size: uint) -> *mut u8 {
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let ptr = je_rallocx(ptr as *mut c_void, size as size_t, mallocx_align(align)) as *mut u8;
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if ptr.is_null() {
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abort()
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}
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ptr
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}
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/// Extend or shrink the allocation referenced by `ptr` to `size` bytes of memory in-place.
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///
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/// Return true if successful, otherwise false if the allocation was not altered.
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///
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/// Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The
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/// alignment must be no larger than the largest supported page size on the platform.
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///
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/// The `old_size` and `align` parameters are the parameters that were used to
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/// create the allocation referenced by `ptr`. The `old_size` parameter may be
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/// any value in range_inclusive(requested_size, usable_size).
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#[inline]
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#[allow(unused_variable)] // for the parameter names in the documentation
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pub unsafe fn reallocate_inplace(ptr: *mut u8, size: uint, align: uint, old_size: uint) -> bool {
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je_xallocx(ptr as *mut c_void, size as size_t, 0, mallocx_align(align)) == size as size_t
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}
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/// Deallocate the memory referenced by `ptr`.
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///
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/// The `ptr` parameter must not be null.
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///
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/// The `size` and `align` parameters are the parameters that were used to create the
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/// allocation referenced by `ptr`. The `size` parameter may also be the value returned by
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/// `usable_size` for the requested size.
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#[inline]
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#[allow(unused_variable)] // for the parameter names in the documentation
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pub unsafe fn deallocate(ptr: *mut u8, size: uint, align: uint) {
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je_dallocx(ptr as *mut c_void, mallocx_align(align))
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}
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/// Return the usable size of an allocation created with the specified the `size` and `align`.
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#[inline]
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pub fn usable_size(size: uint, align: uint) -> uint {
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unsafe { je_nallocx(size as size_t, mallocx_align(align)) as uint }
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}
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