Use #[rustc_std_internal_symbol] instead of #[no_mangle]

Author: Amanieu

src/libpanic_abort/lib.rs

@@ -89,7 +89,7 @@ pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
 // binaries, but it should never be called as we don't link in an unwinding
 // runtime at all.
 pub mod personalities {
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     #[cfg(not(any(
         all(target_arch = "wasm32", not(target_os = "emscripten"),),
         all(target_os = "windows", target_env = "gnu", target_arch = "x86_64",),
@@ -98,7 +98,7 @@ pub mod personalities {
 
     // On x86_64-pc-windows-gnu we use our own personality function that needs
     // to return `ExceptionContinueSearch` as we're passing on all our frames.
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     #[cfg(all(target_os = "windows", target_env = "gnu", target_arch = "x86_64"))]
     pub extern "C" fn rust_eh_personality(
         _record: usize,
@@ -114,16 +114,16 @@ pub mod personalities {
     //
     // Note that we don't execute landing pads, so this is never called, so it's
     // body is empty.
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     #[cfg(all(bootstrap, target_os = "windows", target_env = "gnu"))]
     pub extern "C" fn rust_eh_unwind_resume() {}
 
     // These two are called by our startup objects on i686-pc-windows-gnu, but
     // they don't need to do anything so the bodies are nops.
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     #[cfg(all(target_os = "windows", target_env = "gnu", target_arch = "x86"))]
     pub extern "C" fn rust_eh_register_frames() {}
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     #[cfg(all(target_os = "windows", target_env = "gnu", target_arch = "x86"))]
     pub extern "C" fn rust_eh_unregister_frames() {}
 }

src/libpanic_unwind/emcc.rs

@@ -94,7 +94,6 @@ extern "C" fn exception_cleanup(ptr: *mut libc::c_void) -> DestructorRet {
 }
 
 #[lang = "eh_personality"]
-#[no_mangle]
 unsafe extern "C" fn rust_eh_personality(
     version: c_int,
     actions: uw::_Unwind_Action,

src/libpanic_unwind/gcc.rs

@@ -130,7 +130,6 @@ cfg_if::cfg_if! {
         //
         // iOS uses the default routine instead since it uses SjLj unwinding.
         #[lang = "eh_personality"]
-        #[no_mangle]
         unsafe extern "C" fn rust_eh_personality(state: uw::_Unwind_State,
                                                  exception_object: *mut uw::_Unwind_Exception,
                                                  context: *mut uw::_Unwind_Context)
@@ -264,7 +263,6 @@ cfg_if::cfg_if! {
                 // On x86_64 MinGW targets, the unwinding mechanism is SEH however the unwind
                 // handler data (aka LSDA) uses GCC-compatible encoding.
                 #[lang = "eh_personality"]
-                #[no_mangle]
                 #[allow(nonstandard_style)]
                 unsafe extern "C" fn rust_eh_personality(exceptionRecord: *mut uw::EXCEPTION_RECORD,
                         establisherFrame: uw::LPVOID,
@@ -280,7 +278,6 @@ cfg_if::cfg_if! {
             } else {
                 // The personality routine for most of our targets.
                 #[lang = "eh_personality"]
-                #[no_mangle]
                 unsafe extern "C" fn rust_eh_personality(version: c_int,
                         actions: uw::_Unwind_Action,
                         exception_class: uw::_Unwind_Exception_Class,
@@ -351,12 +348,12 @@ pub mod eh_frame_registry {
         fn __deregister_frame_info(eh_frame_begin: *const u8, object: *mut u8);
     }
 
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     pub unsafe extern "C" fn rust_eh_register_frames(eh_frame_begin: *const u8, object: *mut u8) {
         __register_frame_info(eh_frame_begin, object);
     }
 
-    #[no_mangle]
+    #[rustc_std_internal_symbol]
     pub unsafe extern "C" fn rust_eh_unregister_frames(eh_frame_begin: *const u8, object: *mut u8) {
         __deregister_frame_info(eh_frame_begin, object);
     }

src/libpanic_unwind/lib.rs

@@ -72,7 +72,7 @@ extern "C" {
 
 mod dwarf;
 
-#[no_mangle]
+#[rustc_std_internal_symbol]
 pub unsafe extern "C" fn __rust_panic_cleanup(
     payload: TryPayload,
 ) -> *mut (dyn Any + Send + 'static) {
@@ -81,7 +81,7 @@ pub unsafe extern "C" fn __rust_panic_cleanup(
 
 // Entry point for raising an exception, just delegates to the platform-specific
 // implementation.
-#[no_mangle]
+#[rustc_std_internal_symbol]
 #[unwind(allowed)]
 pub unsafe extern "C" fn __rust_start_panic(payload: usize) -> u32 {
     let payload = payload as *mut &mut dyn BoxMeUp;