Build a dummy alloc_jemalloc crate on platforms that don't support it
This is a hack to support building targets that don't support jemalloc alongside hosts that do. The jemalloc build is controlled by a feature of the std crate, and if that feature changes between targets, it invalidates the fingerprint of std's build script (this is a cargo bug); so we must ensure that the feature set used by std is the same across all targets, which means we have to build the alloc_jemalloc crate for targets like emscripten, even if we don't use it.
This commit is contained in:
Brian Anderson
@@ -23,124 +23,170 @@
|
||||
|
||||
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" {}
|
||||
// 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};
|
||||
|
||||
// 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;
|
||||
}
|
||||
// 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" {}
|
||||
|
||||
// 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;
|
||||
// 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;
|
||||
}
|
||||
|
||||
// MALLOCX_ALIGN(a) macro
|
||||
fn mallocx_align(a: usize) -> c_int {
|
||||
a.trailing_zeros() as c_int
|
||||
}
|
||||
// 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;
|
||||
|
||||
fn align_to_flags(align: usize) -> c_int {
|
||||
if align <= MIN_ALIGN {
|
||||
// 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(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()
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user