extern crate libc;
-use libc::{c_int, c_void, size_t};
+pub use imp::*;
-// 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;
-}
+// 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};
-// 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")))]
-const MIN_ALIGN: usize = 16;
-
-// MALLOCX_ALIGN(a) macro
-fn mallocx_align(a: usize) -> c_int {
- a.trailing_zeros() as c_int
-}
+ // 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")))]
+ 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 }
+ }
-fn align_to_flags(align: usize) -> c_int {
- if align <= MIN_ALIGN {
+ #[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(target_os = "android")]
+ pub extern "C" fn pthread_atfork(_prefork: *mut u8,
+ _postfork_parent: *mut u8,
+ _postfork_child: *mut u8)
+ -> i32 {
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 }
-}
+#[cfg(dummy_jemalloc)]
+mod imp {
+ fn bogus() -> ! {
+ panic!("jemalloc is not implemented for this platform");
+ }
-#[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_allocate(_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 {
- 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_reallocate(_ptr: *mut u8,
+ _old_size: usize,
+ _size: usize,
+ _align: usize)
+ -> *mut u8 {
+ bogus()
+ }
-#[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_reallocate_inplace(_ptr: *mut u8,
+ _old_size: usize,
+ _size: usize,
+ _align: usize)
+ -> usize {
+ bogus()
+ }
-#[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 }
-}
+ #[no_mangle]
+ pub extern "C" fn __rust_deallocate(_ptr: *mut u8, _old_size: usize, _align: usize) {
+ bogus()
+ }
-// 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(target_os = "android")]
-pub extern "C" fn pthread_atfork(_prefork: *mut u8,
- _postfork_parent: *mut u8,
- _postfork_child: *mut u8)
- -> i32 {
- 0
+ #[no_mangle]
+ pub extern "C" fn __rust_usable_size(_size: usize, _align: usize) -> usize {
+ bogus()
+ }
}