std: unsafe-wrap gcc::rust_eh_personality and impl

library/std/src/sys/personality/gcc.rs

@@ -35,6 +35,7 @@
 //!
 //! Once stack has been unwound down to the handler frame level, unwinding stops
 //! and the last personality routine transfers control to the catch block.
+#![forbid(unsafe_op_in_unsafe_fn)]
 
 use super::dwarf::eh::{self, EHAction, EHContext};
 use crate::ffi::c_int;
@@ -92,7 +93,11 @@ const UNWIND_DATA_REG: (i32, i32) = (4, 5); // a0, a1
 // https://github.com/gcc-mirror/gcc/blob/trunk/libgcc/unwind-c.c
 
 cfg_if::cfg_if! {
-    if #[cfg(all(not(all(target_vendor = "apple", not(target_os = "watchos"))), target_arch = "arm", not(target_os = "netbsd")))] {
+    if #[cfg(all(
+            target_arch = "arm",
+            not(all(target_vendor = "apple", not(target_os = "watchos"))),
+            not(target_os = "netbsd"),
+        ))] {
         // ARM EHABI personality routine.
         // https://web.archive.org/web/20190728160938/https://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf
         //
@@ -104,6 +109,7 @@ cfg_if::cfg_if! {
             exception_object: *mut uw::_Unwind_Exception,
             context: *mut uw::_Unwind_Context,
         ) -> uw::_Unwind_Reason_Code {
+            unsafe {
                 let state = state as c_int;
                 let action = state & uw::_US_ACTION_MASK as c_int;
                 let search_phase = if action == uw::_US_VIRTUAL_UNWIND_FRAME as c_int {
@@ -176,12 +182,14 @@ cfg_if::cfg_if! {
                     exception_object: *mut uw::_Unwind_Exception,
                     context: *mut uw::_Unwind_Context,
                 ) -> uw::_Unwind_Reason_Code {
+                    unsafe {
                         if __gnu_unwind_frame(exception_object, context) == uw::_URC_NO_REASON {
                             uw::_URC_CONTINUE_UNWIND
                         } else {
                             uw::_URC_FAILURE
                         }
                     }
+                }
                 // defined in libgcc
                 extern "C" {
                     fn __gnu_unwind_frame(
@@ -190,6 +198,7 @@ cfg_if::cfg_if! {
                     ) -> uw::_Unwind_Reason_Code;
                 }
             }
+        }
     } else {
         // Default personality routine, which is used directly on most targets
         // and indirectly on Windows x86_64 via SEH.
@@ -200,6 +209,7 @@ cfg_if::cfg_if! {
             exception_object: *mut uw::_Unwind_Exception,
             context: *mut uw::_Unwind_Context,
         ) -> uw::_Unwind_Reason_Code {
+            unsafe {
                 if version != 1 {
                     return uw::_URC_FATAL_PHASE1_ERROR;
                 }
@@ -232,6 +242,7 @@ cfg_if::cfg_if! {
                     }
                 }
             }
+        }
 
         cfg_if::cfg_if! {
             if #[cfg(all(windows, any(target_arch = "aarch64", target_arch = "x86_64"), target_env = "gnu"))] {
@@ -245,6 +256,7 @@ cfg_if::cfg_if! {
                     contextRecord: *mut uw::CONTEXT,
                     dispatcherContext: *mut uw::DISPATCHER_CONTEXT,
                 ) -> uw::EXCEPTION_DISPOSITION {
+                    unsafe {
                         uw::_GCC_specific_handler(
                             exceptionRecord,
                             establisherFrame,
@@ -253,6 +265,7 @@ cfg_if::cfg_if! {
                             rust_eh_personality_impl,
                         )
                     }
+                }
             } else {
                 // The personality routine for most of our targets.
                 #[lang = "eh_personality"]
@@ -263,6 +276,7 @@ cfg_if::cfg_if! {
                     exception_object: *mut uw::_Unwind_Exception,
                     context: *mut uw::_Unwind_Context,
                 ) -> uw::_Unwind_Reason_Code {
+                    unsafe {
                         rust_eh_personality_impl(
                             version,
                             actions,
@@ -275,8 +289,10 @@ cfg_if::cfg_if! {
             }
         }
     }
+}
 
 unsafe fn find_eh_action(context: *mut uw::_Unwind_Context) -> Result<EHAction, ()> {
+    unsafe {
         let lsda = uw::_Unwind_GetLanguageSpecificData(context) as *const u8;
         let mut ip_before_instr: c_int = 0;
         let ip = uw::_Unwind_GetIPInfo(context, &mut ip_before_instr);
@@ -292,3 +308,4 @@ unsafe fn find_eh_action(context: *mut uw::_Unwind_Context) -> Result<EHAction,
         };
         eh::find_eh_action(lsda, &eh_context)
     }
+}