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Disable mangling for msvc stack builtins 

This prevents linker errors in test builds due to the `jmp` instruction in __alloca
This commit is contained in:
Matt Ickstadt 2016-08-17 12:53:56 -05:00
parent c9bff743cd
commit aab3a10a9d
1 changed files with 7 additions and 3 deletions
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10
src/x86_64.rs
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@ -2,9 +2,13 @@ use core::intrinsics;
// NOTE These functions are implemented using assembly because they using a custom // NOTE These functions are implemented using assembly because they using a custom
// calling convention which can't be implemented using a normal Rust function // calling convention which can't be implemented using a normal Rust function
// NOTE These functions are never mangled as they are not tested against compiler-rt
// and mangling ___chkstk would break the `jmp ___chkstk` instruction in __alloca
#[cfg(windows)] #[cfg(windows)]
#[naked] #[naked]
#[cfg_attr(not(test), no_mangle)] #[no_mangle]
pub unsafe fn ___chkstk_ms() { pub unsafe fn ___chkstk_ms() {
asm!("push %rcx asm!("push %rcx
push %rax push %rax
@ -28,7 +32,7 @@ pub unsafe fn ___chkstk_ms() {
#[cfg(windows)] #[cfg(windows)]
#[naked] #[naked]
#[cfg_attr(not(test), no_mangle)] #[no_mangle]
pub unsafe fn __alloca() { pub unsafe fn __alloca() {
asm!("mov %rcx,%rax // x64 _alloca is a normal function with parameter in rcx asm!("mov %rcx,%rax // x64 _alloca is a normal function with parameter in rcx
jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable"); jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable");
@ -37,7 +41,7 @@ pub unsafe fn __alloca() {
#[cfg(windows)] #[cfg(windows)]
#[naked] #[naked]
#[cfg_attr(not(test), no_mangle)] #[no_mangle]
pub unsafe fn ___chkstk() { pub unsafe fn ___chkstk() {
asm!("push %rcx asm!("push %rcx
cmp $$0x1000,%rax cmp $$0x1000,%rax