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

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This commit is contained in:
Scott Mabin 2021-04-03 18:57:16 +01:00
parent 69dd19ef03
commit 8c4127d044
1 changed files with 5 additions and 0 deletions
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5
library/compiler-builtins/src/mem/mod.rs
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@ -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 {
@ -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 {
@ -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)
}