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// Copyright 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.
#![crate_name = "alloc_jemalloc"]
#![crate_type = "rlib"]
#![no_std]
#![allocator]
#![unstable(feature = "alloc_jemalloc",
reason = "this library is unlikely to be stabilized in its current \
form or name",
issue = "27783")]
#![deny(warnings)]
#![feature(allocator)]
#![feature(libc)]
#![feature(staged_api)]
extern crate libc;
pub use imp::*;
// See comments in build.rs for why we sometimes build a crate that does nothing
#[cfg(not(dummy_jemalloc))]
mod imp {
use libc::{c_int, c_void, size_t};
// Linkage directives to pull in jemalloc and its dependencies.
//
// On some platforms we need to be sure to link in `pthread` which jemalloc
// depends on, and specifically on android we need to also link to libgcc.
// Currently jemalloc is compiled with gcc which will generate calls to
// intrinsics that are libgcc specific (e.g. those intrinsics aren't present in
// libcompiler-rt), so link that in to get that support.
#[link(name = "jemalloc", kind = "static")]
#[cfg_attr(target_os = "android", link(name = "gcc"))]
#[cfg_attr(all(not(windows),
not(target_os = "android"),
not(target_env = "musl")),
link(name = "pthread"))]
#[cfg(not(cargobuild))]
extern "C" {}
// Note that the symbols here are prefixed by default on OSX and Windows (we
// don't explicitly request it), and on Android and DragonFly we explicitly
// request it as unprefixing cause segfaults (mismatches in allocators).
extern "C" {
#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
target_os = "dragonfly", target_os = "windows"),
link_name = "je_mallocx")]
fn mallocx(size: size_t, flags: c_int) -> *mut c_void;
#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
target_os = "dragonfly", target_os = "windows"),
link_name = "je_rallocx")]
fn rallocx(ptr: *mut c_void, size: size_t, flags: c_int) -> *mut c_void;
#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
target_os = "dragonfly", target_os = "windows"),
link_name = "je_xallocx")]
fn xallocx(ptr: *mut c_void, size: size_t, extra: size_t, flags: c_int) -> size_t;
#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
target_os = "dragonfly", target_os = "windows"),
link_name = "je_sdallocx")]
fn sdallocx(ptr: *mut c_void, size: size_t, flags: c_int);
#[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
target_os = "dragonfly", target_os = "windows"),
link_name = "je_nallocx")]
fn nallocx(size: size_t, flags: c_int) -> size_t;
}
// The minimum alignment guaranteed by the architecture. This value is used to
// add fast paths for low alignment values. In practice, the alignment is a
// constant at the call site and the branch will be optimized out.
#[cfg(all(any(target_arch = "arm",
target_arch = "mips",
target_arch = "powerpc")))]
const MIN_ALIGN: usize = 8;
#[cfg(all(any(target_arch = "x86",
target_arch = "x86_64",
target_arch = "aarch64",
target_arch = "powerpc64",
target_arch = "mips64",
target_arch = "s390x",
target_arch = "sparc64")))]
const MIN_ALIGN: usize = 16;
// MALLOCX_ALIGN(a) macro
fn mallocx_align(a: usize) -> c_int {
a.trailing_zeros() as c_int
}
fn align_to_flags(align: usize) -> c_int {
if align <= MIN_ALIGN {
0
} else {
mallocx_align(align)
}
}
#[no_mangle]
pub extern "C" fn __rust_allocate(size: usize, align: usize) -> *mut u8 {
let flags = align_to_flags(align);
unsafe { mallocx(size as size_t, flags) as *mut u8 }
}
#[no_mangle]
pub extern "C" fn __rust_reallocate(ptr: *mut u8,
_old_size: usize,
size: usize,
align: usize)
-> *mut u8 {
let flags = align_to_flags(align);
unsafe { rallocx(ptr as *mut c_void, size as size_t, flags) as *mut u8 }
}
#[no_mangle]
pub extern "C" fn __rust_reallocate_inplace(ptr: *mut u8,
_old_size: usize,
size: usize,
align: usize)
-> usize {
let flags = align_to_flags(align);
unsafe { xallocx(ptr as *mut c_void, size as size_t, 0, flags) as usize }
}
#[no_mangle]
pub extern "C" fn __rust_deallocate(ptr: *mut u8, old_size: usize, align: usize) {
let flags = align_to_flags(align);
unsafe { sdallocx(ptr as *mut c_void, old_size as size_t, flags) }
}
#[no_mangle]
pub extern "C" fn __rust_usable_size(size: usize, align: usize) -> usize {
let flags = align_to_flags(align);
unsafe { nallocx(size as size_t, flags) as usize }
}
// These symbols are used by jemalloc on android but the really old android
// we're building on doesn't have them defined, so just make sure the symbols
// are available.
#[no_mangle]
#[cfg(all(target_os = "android", not(cargobuild)))]
pub extern "C" fn pthread_atfork(_prefork: *mut u8,
_postfork_parent: *mut u8,
_postfork_child: *mut u8)
-> i32 {
0
}
}
#[cfg(dummy_jemalloc)]
mod imp {
fn bogus() -> ! {
panic!("jemalloc is not implemented for this platform");
}
#[no_mangle]
pub extern "C" fn __rust_allocate(_size: usize, _align: usize) -> *mut u8 {
bogus()
}
#[no_mangle]
pub extern "C" fn __rust_reallocate(_ptr: *mut u8,
_old_size: usize,
_size: usize,
_align: usize)
-> *mut u8 {
bogus()
}
#[no_mangle]
pub extern "C" fn __rust_reallocate_inplace(_ptr: *mut u8,
_old_size: usize,
_size: usize,
_align: usize)
-> usize {
bogus()
}
#[no_mangle]
pub extern "C" fn __rust_deallocate(_ptr: *mut u8, _old_size: usize, _align: usize) {
bogus()
}
#[no_mangle]
pub extern "C" fn __rust_usable_size(_size: usize, _align: usize) -> usize {
bogus()
}
}
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