Rollup merge of #73418 - doctorn:variants-intrinsic, r=kennytm

[rust.git] / src / libpanic_unwind / lib.rs

diff --git a/src/libpanic_unwind/lib.rs b/src/libpanic_unwind/lib.rs
index d6c3366693818583466adac05bed0588e2e6c12a..f361354da2ac2ff59081a778e10b4fcfb67edec6 100644 (file)
--- a/src/libpanic_unwind/lib.rs
+++ b/src/libpanic_unwind/lib.rs
@@ -30,6 +30,8 @@
 #![feature(raw)]
 #![panic_runtime]
 #![feature(panic_runtime)]
+// `real_imp` is unused with Miri, so silence warnings.
+#![cfg_attr(miri, allow(dead_code))]
 
 use alloc::boxed::Box;
 use core::any::Any;
@@ -38,25 +40,35 @@
 cfg_if::cfg_if! {
     if #[cfg(target_os = "emscripten")] {
         #[path = "emcc.rs"]
-        mod imp;
+        mod real_imp;
     } else if #[cfg(target_arch = "wasm32")] {
         #[path = "dummy.rs"]
-        mod imp;
+        mod real_imp;
     } else if #[cfg(target_os = "hermit")] {
         #[path = "hermit.rs"]
-        mod imp;
-    } else if #[cfg(all(target_env = "msvc", target_arch = "aarch64"))] {
-        #[path = "dummy.rs"]
-        mod imp;
+        mod real_imp;
     } else if #[cfg(target_env = "msvc")] {
         #[path = "seh.rs"]
-        mod imp;
+        mod real_imp;
     } else {
         // Rust runtime's startup objects depend on these symbols, so make them public.
         #[cfg(all(target_os="windows", target_arch = "x86", target_env="gnu"))]
-        pub use imp::eh_frame_registry::*;
+        pub use real_imp::eh_frame_registry::*;
         #[path = "gcc.rs"]
+        mod real_imp;
+    }
+}
+
+cfg_if::cfg_if! {
+    if #[cfg(miri)] {
+        // Use the Miri runtime.
+        // We still need to also load the normal runtime above, as rustc expects certain lang
+        // items from there to be defined.
+        #[path = "miri.rs"]
         mod imp;
+    } else {
+        // Use the real runtime.
+        use real_imp as imp;
     }
 }
 
@@ -69,6 +81,7 @@
 mod dwarf;
 
 #[rustc_std_internal_symbol]
+#[cfg_attr(not(bootstrap), allow(improper_ctypes_definitions))]
 pub unsafe extern "C" fn __rust_panic_cleanup(payload: *mut u8) -> *mut (dyn Any + Send + 'static) {
     Box::into_raw(imp::cleanup(payload))
 }
@@ -81,12 +94,5 @@
     let payload = payload as *mut &mut dyn BoxMeUp;
     let payload = (*payload).take_box();
 
-    // Miri panic support: cfg'd out of normal builds just to be sure.
-    // When going through normal codegen, `miri_start_panic` is a NOP, so the
-    // Miri-enabled sysroot still supports normal unwinding. But when executed in
-    // Miri, this line initiates unwinding.
-    #[cfg(miri)]
-    core::intrinsics::miri_start_panic(payload);
-
     imp::panic(Box::from_raw(payload))
 }