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Add #[linkage = "weak"] attribute to all mem instrinics. #411

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merged 1 commit into from
Apr 5, 2021
Merged

Add #[linkage = "weak"] attribute to all mem instrinics. #411

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5 changes: 5 additions & 0 deletions src/mem/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,12 +20,14 @@ use core::ops::{BitOr, Shl};
mod impls;

#[cfg_attr(all(feature = "mem", not(feature = "mangled-names")), no_mangle)]
#[cfg_attr(not(all(target_os = "windows", target_env = "gnu")), linkage = "weak")]
pub unsafe extern "C" fn memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8 {
impls::copy_forward(dest, src, n);
dest
}

#[cfg_attr(all(feature = "mem", not(feature = "mangled-names")), no_mangle)]
#[cfg_attr(not(all(target_os = "windows", target_env = "gnu")), linkage = "weak")]
pub unsafe extern "C" fn memmove(dest: *mut u8, src: *const u8, n: usize) -> *mut u8 {
let delta = (dest as usize).wrapping_sub(src as usize);
if delta >= n {
Expand All @@ -39,12 +41,14 @@ pub unsafe extern "C" fn memmove(dest: *mut u8, src: *const u8, n: usize) -> *mu
}

#[cfg_attr(all(feature = "mem", not(feature = "mangled-names")), no_mangle)]
#[cfg_attr(not(all(target_os = "windows", target_env = "gnu")), linkage = "weak")]
pub unsafe extern "C" fn memset(s: *mut u8, c: c_int, n: usize) -> *mut u8 {
impls::set_bytes(s, c as u8, n);
s
}

#[cfg_attr(all(feature = "mem", not(feature = "mangled-names")), no_mangle)]
#[cfg_attr(not(all(target_os = "windows", target_env = "gnu")), linkage = "weak")]
pub unsafe extern "C" fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32 {
let mut i = 0;
while i < n {
Expand All @@ -59,6 +63,7 @@ pub unsafe extern "C" fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32 {
}

#[cfg_attr(all(feature = "mem", not(feature = "mangled-names")), no_mangle)]
#[cfg_attr(not(all(target_os = "windows", target_env = "gnu")), linkage = "weak")]
pub unsafe extern "C" fn bcmp(s1: *const u8, s2: *const u8, n: usize) -> i32 {
memcmp(s1, s2, n)
}
Expand Down