1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![crate_name = "alloc_jemalloc"]
12 #![crate_type = "rlib"]
15 #![unstable(feature = "alloc_jemalloc",
16 reason = "this library is unlikely to be stabilized in its current \
19 #![cfg_attr(not(stage0), deny(warnings))]
20 #![feature(allocator)]
22 #![feature(staged_api)]
26 use libc::{c_int, c_void, size_t};
28 // Linkage directives to pull in jemalloc and its dependencies.
30 // On some platforms we need to be sure to link in `pthread` which jemalloc
31 // depends on, and specifically on android we need to also link to libgcc.
32 // Currently jemalloc is compiled with gcc which will generate calls to
33 // intrinsics that are libgcc specific (e.g. those intrinsics aren't present in
34 // libcompiler-rt), so link that in to get that support.
35 #[link(name = "jemalloc", kind = "static")]
36 #[cfg_attr(target_os = "android", link(name = "gcc"))]
37 #[cfg_attr(all(not(windows),
38 not(target_os = "android"),
39 not(target_env = "musl")),
40 link(name = "pthread"))]
41 #[cfg(not(cargobuild))]
44 // Note that the symbols here are prefixed by default on OSX (we don't
45 // explicitly request it), and on Android we explicitly request it as
46 // unprefixing cause segfaults (mismatches in allocators).
48 #[cfg_attr(any(target_os = "macos", target_os = "android"),
49 link_name = "je_mallocx")]
50 fn mallocx(size: size_t, flags: c_int) -> *mut c_void;
51 #[cfg_attr(any(target_os = "macos", target_os = "android"),
52 link_name = "je_rallocx")]
53 fn rallocx(ptr: *mut c_void, size: size_t, flags: c_int) -> *mut c_void;
54 #[cfg_attr(any(target_os = "macos", target_os = "android"),
55 link_name = "je_xallocx")]
56 fn xallocx(ptr: *mut c_void, size: size_t, extra: size_t, flags: c_int) -> size_t;
57 #[cfg_attr(any(target_os = "macos", target_os = "android"),
58 link_name = "je_sdallocx")]
59 fn sdallocx(ptr: *mut c_void, size: size_t, flags: c_int);
60 #[cfg_attr(any(target_os = "macos", target_os = "android"),
61 link_name = "je_nallocx")]
62 fn nallocx(size: size_t, flags: c_int) -> size_t;
65 // The minimum alignment guaranteed by the architecture. This value is used to
66 // add fast paths for low alignment values. In practice, the alignment is a
67 // constant at the call site and the branch will be optimized out.
68 #[cfg(all(any(target_arch = "arm",
70 target_arch = "powerpc")))]
71 const MIN_ALIGN: usize = 8;
72 #[cfg(all(any(target_arch = "x86",
73 target_arch = "x86_64",
74 target_arch = "aarch64",
75 target_arch = "powerpc64")))]
76 const MIN_ALIGN: usize = 16;
78 // MALLOCX_ALIGN(a) macro
79 fn mallocx_align(a: usize) -> c_int {
80 a.trailing_zeros() as c_int
83 fn align_to_flags(align: usize) -> c_int {
84 if align <= MIN_ALIGN {
92 pub extern "C" fn __rust_allocate(size: usize, align: usize) -> *mut u8 {
93 let flags = align_to_flags(align);
94 unsafe { mallocx(size as size_t, flags) as *mut u8 }
98 pub extern "C" fn __rust_reallocate(ptr: *mut u8,
103 let flags = align_to_flags(align);
104 unsafe { rallocx(ptr as *mut c_void, size as size_t, flags) as *mut u8 }
108 pub extern "C" fn __rust_reallocate_inplace(ptr: *mut u8,
113 let flags = align_to_flags(align);
114 unsafe { xallocx(ptr as *mut c_void, size as size_t, 0, flags) as usize }
118 pub extern "C" fn __rust_deallocate(ptr: *mut u8, old_size: usize, align: usize) {
119 let flags = align_to_flags(align);
120 unsafe { sdallocx(ptr as *mut c_void, old_size as size_t, flags) }
124 pub extern "C" fn __rust_usable_size(size: usize, align: usize) -> usize {
125 let flags = align_to_flags(align);
126 unsafe { nallocx(size as size_t, flags) as usize }
129 // These symbols are used by jemalloc on android but the really old android
130 // we're building on doesn't have them defined, so just make sure the symbols
133 #[cfg(target_os = "android")]
134 pub extern fn pthread_atfork(_prefork: *mut u8,
135 _postfork_parent: *mut u8,
136 _postfork_child: *mut u8) -> i32 {