Don't mangle probes all the time

Author: alexcrichton

src/probestack.rs

@@ -44,7 +44,7 @@
 #![cfg(not(windows))] // Windows already has builtins to do this
 
 #[naked]
-#[no_mangle]
+#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
 #[cfg(target_arch = "x86_64")]
 pub unsafe extern fn __rust_probestack() {
     // Our goal here is to touch each page between %rsp+8 and %rsp+8-%rax,
@@ -87,7 +87,7 @@ pub unsafe extern fn __rust_probestack() {
 }
 
 #[naked]
-#[no_mangle]
+#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
 #[cfg(target_arch = "x86")]
 pub unsafe extern fn __rust_probestack() {
     // This is the same as x86_64 above, only translated for 32-bit sizes. Note

src/x86_64.rs

@@ -10,7 +10,7 @@ use core::intrinsics;
 
 #[cfg(windows)]
 #[naked]
-#[no_mangle]
+#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
 pub unsafe fn ___chkstk_ms() {
     asm!("push   %rcx
           push   %rax
@@ -34,7 +34,7 @@ pub unsafe fn ___chkstk_ms() {
 
 #[cfg(windows)]
 #[naked]
-#[no_mangle]
+#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
 pub unsafe fn __alloca() {
     asm!("mov    %rcx,%rax  // x64 _alloca is a normal function with parameter in rcx
           jmp    ___chkstk  // Jump to ___chkstk since fallthrough may be unreliable");
@@ -43,7 +43,7 @@ pub unsafe fn __alloca() {
 
 #[cfg(windows)]
 #[naked]
-#[no_mangle]
+#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
 pub unsafe fn ___chkstk() {
     asm!("push   %rcx
           cmp    $$0x1000,%rax