/
heap.rs
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/
heap.rs
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// Copyright 2014 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.
// FIXME: #13994: port to the sized deallocation API when available
// FIXME: #13996: need a way to mark the `allocate` and `reallocate` return values as `noalias`
use intrinsics::{abort, cttz32};
use libc::{c_char, c_int, c_void, size_t};
use ptr::{RawPtr, mut_null, null};
use option::{None, Option};
#[link(name = "jemalloc", kind = "static")]
extern {
fn je_mallocx(size: size_t, flags: c_int) -> *mut c_void;
fn je_rallocx(ptr: *mut c_void, size: size_t, flags: c_int) -> *mut c_void;
fn je_xallocx(ptr: *mut c_void, size: size_t, extra: size_t, flags: c_int) -> size_t;
fn je_dallocx(ptr: *mut c_void, flags: c_int);
fn je_nallocx(size: size_t, flags: c_int) -> size_t;
fn je_malloc_stats_print(write_cb: Option<extern "C" fn(cbopaque: *mut c_void, *c_char)>,
cbopaque: *mut c_void,
opts: *c_char);
}
// -lpthread needs to occur after -ljemalloc, the earlier argument isn't enough
#[cfg(not(windows), not(target_os = "android"))]
#[link(name = "pthread")]
extern {}
// MALLOCX_ALIGN(a) macro
#[inline(always)]
fn mallocx_align(a: uint) -> c_int { unsafe { cttz32(a as u32) as c_int } }
/// Return a pointer to `size` bytes of memory.
///
/// Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The
/// alignment must be no larger than the largest supported page size on the platform.
#[inline]
pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
let ptr = je_mallocx(size as size_t, mallocx_align(align)) as *mut u8;
if ptr.is_null() {
abort()
}
ptr
}
/// Extend or shrink the allocation referenced by `ptr` to `size` bytes of memory.
///
/// Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The
/// alignment must be no larger than the largest supported page size on the platform.
///
/// The `old_size` and `align` parameters are the parameters that were used to create the
/// allocation referenced by `ptr`. The `old_size` parameter may also be the value returned by
/// `usable_size` for the requested size.
#[inline]
#[allow(unused_variable)] // for the parameter names in the documentation
pub unsafe fn reallocate(ptr: *mut u8, size: uint, align: uint, old_size: uint) -> *mut u8 {
let ptr = je_rallocx(ptr as *mut c_void, size as size_t, mallocx_align(align)) as *mut u8;
if ptr.is_null() {
abort()
}
ptr
}
/// Extend or shrink the allocation referenced by `ptr` to `size` bytes of memory in-place.
///
/// Return true if successful, otherwise false if the allocation was not altered.
///
/// Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The
/// alignment must be no larger than the largest supported page size on the platform.
///
/// The `old_size` and `align` parameters are the parameters that were used to
/// create the allocation referenced by `ptr`. The `old_size` parameter may be
/// any value in range_inclusive(requested_size, usable_size).
#[inline]
#[allow(unused_variable)] // for the parameter names in the documentation
pub unsafe fn reallocate_inplace(ptr: *mut u8, size: uint, align: uint, old_size: uint) -> bool {
je_xallocx(ptr as *mut c_void, size as size_t, 0, mallocx_align(align)) == size as size_t
}
/// Deallocate the memory referenced by `ptr`.
///
/// The `ptr` parameter must not be null.
///
/// The `size` and `align` parameters are the parameters that were used to create the
/// allocation referenced by `ptr`. The `size` parameter may also be the value returned by
/// `usable_size` for the requested size.
#[inline]
#[allow(unused_variable)] // for the parameter names in the documentation
pub unsafe fn deallocate(ptr: *mut u8, size: uint, align: uint) {
je_dallocx(ptr as *mut c_void, mallocx_align(align))
}
/// Return the usable size of an allocation created with the specified the `size` and `align`.
#[inline]
pub fn usable_size(size: uint, align: uint) -> uint {
unsafe { je_nallocx(size as size_t, mallocx_align(align)) as uint }
}
/// Print implementation-defined allocator statistics.
///
/// These statistics may be inconsistent if other threads use the allocator during the call.
#[unstable]
pub fn stats_print() {
unsafe {
je_malloc_stats_print(None, mut_null(), null())
}
}
/// The allocator for unique pointers.
#[cfg(not(test))]
#[lang="exchange_malloc"]
#[inline(always)]
pub unsafe fn exchange_malloc_(size: uint, align: uint) -> *mut u8 {
exchange_malloc(size, align)
}
/// The allocator for unique pointers.
#[inline]
pub unsafe fn exchange_malloc(size: uint, align: uint) -> *mut u8 {
// The compiler never calls `exchange_free` on ~ZeroSizeType, so zero-size
// allocations can point to this `static`. It would be incorrect to use a null
// pointer, due to enums assuming types like unique pointers are never null.
static EMPTY: () = ();
if size == 0 {
&EMPTY as *() as *mut u8
} else {
allocate(size, align)
}
}
#[cfg(not(test))]
#[lang="exchange_free"]
#[inline]
// FIXME: #13994 (rustc should pass align and size here)
unsafe fn exchange_free(ptr: *mut u8) {
deallocate(ptr, 0, 8);
}
// FIXME: #7496
#[cfg(not(test))]
#[lang="closure_exchange_malloc"]
#[inline]
unsafe fn closure_exchange_malloc(drop_glue: fn(*mut u8), size: uint, align: uint) -> *mut u8 {
let total_size = ::rt::util::get_box_size(size, align);
let p = allocate(total_size, 8);
let alloc = p as *mut ::raw::Box<()>;
(*alloc).drop_glue = drop_glue;
alloc as *mut u8
}
// hack for libcore
#[no_mangle]
#[doc(hidden)]
#[deprecated]
#[cfg(not(test))]
pub unsafe extern "C" fn rust_malloc(size: uint, align: uint) -> *mut u8 {
exchange_malloc(size, align)
}
// hack for libcore
#[no_mangle]
#[doc(hidden)]
#[deprecated]
#[cfg(not(test))]
pub unsafe extern "C" fn rust_free(ptr: *mut u8, size: uint, align: uint) {
deallocate(ptr, size, align)
}
#[cfg(test)]
mod bench {
extern crate test;
use self::test::Bencher;
#[bench]
fn alloc_owned_small(b: &mut Bencher) {
b.iter(|| {
box 10
})
}
#[bench]
fn alloc_owned_big(b: &mut Bencher) {
b.iter(|| {
box [10, ..1000]
})
}
}