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 \
20 #![feature(allocator)]
22 #![feature(staged_api)]
28 // See comments in build.rs for why we sometimes build a crate that does nothing
29 #[cfg(not(dummy_jemalloc))]
31 use libc::{c_int, c_void, size_t};
33 // Note that the symbols here are prefixed by default on OSX and Windows (we
34 // don't explicitly request it), and on Android and DragonFly we explicitly
35 // request it as unprefixing cause segfaults (mismatches in allocators).
37 #[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
38 target_os = "dragonfly", target_os = "windows"),
39 link_name = "je_mallocx")]
40 fn mallocx(size: size_t, flags: c_int) -> *mut c_void;
41 #[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
42 target_os = "dragonfly", target_os = "windows"),
43 link_name = "je_rallocx")]
44 fn rallocx(ptr: *mut c_void, size: size_t, flags: c_int) -> *mut c_void;
45 #[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
46 target_os = "dragonfly", target_os = "windows"),
47 link_name = "je_xallocx")]
48 fn xallocx(ptr: *mut c_void, size: size_t, extra: size_t, flags: c_int) -> size_t;
49 #[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
50 target_os = "dragonfly", target_os = "windows"),
51 link_name = "je_sdallocx")]
52 fn sdallocx(ptr: *mut c_void, size: size_t, flags: c_int);
53 #[cfg_attr(any(target_os = "macos", target_os = "android", target_os = "ios",
54 target_os = "dragonfly", target_os = "windows"),
55 link_name = "je_nallocx")]
56 fn nallocx(size: size_t, flags: c_int) -> size_t;
59 // The minimum alignment guaranteed by the architecture. This value is used to
60 // add fast paths for low alignment values. In practice, the alignment is a
61 // constant at the call site and the branch will be optimized out.
62 #[cfg(all(any(target_arch = "arm",
64 target_arch = "powerpc")))]
65 const MIN_ALIGN: usize = 8;
66 #[cfg(all(any(target_arch = "x86",
67 target_arch = "x86_64",
68 target_arch = "aarch64",
69 target_arch = "powerpc64",
70 target_arch = "mips64",
71 target_arch = "s390x",
72 target_arch = "sparc64")))]
73 const MIN_ALIGN: usize = 16;
75 // MALLOCX_ALIGN(a) macro
76 fn mallocx_align(a: usize) -> c_int {
77 a.trailing_zeros() as c_int
80 fn align_to_flags(align: usize) -> c_int {
81 if align <= MIN_ALIGN {
89 pub extern "C" fn __rust_allocate(size: usize, align: usize) -> *mut u8 {
90 let flags = align_to_flags(align);
91 unsafe { mallocx(size as size_t, flags) as *mut u8 }
95 pub extern "C" fn __rust_reallocate(ptr: *mut u8,
100 let flags = align_to_flags(align);
101 unsafe { rallocx(ptr as *mut c_void, size as size_t, flags) as *mut u8 }
105 pub extern "C" fn __rust_reallocate_inplace(ptr: *mut u8,
110 let flags = align_to_flags(align);
111 unsafe { xallocx(ptr as *mut c_void, size as size_t, 0, flags) as usize }
115 pub extern "C" fn __rust_deallocate(ptr: *mut u8, old_size: usize, align: usize) {
116 let flags = align_to_flags(align);
117 unsafe { sdallocx(ptr as *mut c_void, old_size as size_t, flags) }
121 pub extern "C" fn __rust_usable_size(size: usize, align: usize) -> usize {
122 let flags = align_to_flags(align);
123 unsafe { nallocx(size as size_t, flags) as usize }
126 // These symbols are used by jemalloc on android but the really old android
127 // we're building on doesn't have them defined, so just make sure the symbols
130 #[cfg(all(target_os = "android", not(cargobuild)))]
131 pub extern "C" fn pthread_atfork(_prefork: *mut u8,
132 _postfork_parent: *mut u8,
133 _postfork_child: *mut u8)
139 #[cfg(dummy_jemalloc)]
142 panic!("jemalloc is not implemented for this platform");
146 pub extern "C" fn __rust_allocate(_size: usize, _align: usize) -> *mut u8 {
151 pub extern "C" fn __rust_reallocate(_ptr: *mut u8,
160 pub extern "C" fn __rust_reallocate_inplace(_ptr: *mut u8,
169 pub extern "C" fn __rust_deallocate(_ptr: *mut u8, _old_size: usize, _align: usize) {
174 pub extern "C" fn __rust_usable_size(_size: usize, _align: usize) -> usize {