Re-export _Unwind_Resume

Author: Mark-Simulacrum

src/libpanic_unwind/gcc.rs

@@ -324,19 +324,25 @@ unsafe fn find_eh_action(
     eh::find_eh_action(lsda, &eh_context, foreign_exception)
 }
 
-// See docs in the `unwind` module.
+#[cfg(all(
+    target_os = "windows",
+    any(target_arch = "x86", target_arch = "x86_64"),
+    target_env = "gnu"
+))]
+#[cfg_attr(not(bootstrap), lang = "eh_unwind_resume")]
+#[used]
+pub static RESUME: unsafe extern "C" fn(*mut uw::_Unwind_Exception) -> ! =
+    uw::_Unwind_Resume as unsafe extern "C" fn(_) -> !;
+
 #[cfg(all(
     target_os = "windows",
     any(target_arch = "x86", target_arch = "x86_64"),
     target_env = "gnu"
 ))]
 #[lang = "eh_unwind_resume"]
-#[unwind(allowed)]
-// This must always be inlined because _Unwind_Resume expects to be called
-// directly from the landing pad.
-#[cfg_attr(not(bootstrap), inline(always))]
-unsafe extern "C" fn rust_eh_unwind_resume(panic_ctx: *mut u8) -> ! {
-    uw::_Unwind_Resume(panic_ctx as *mut uw::_Unwind_Exception);
+#[cfg(bootstrap)]
+pub unsafe extern "C" fn rust_eh_unwind_resume(p: *mut u8) -> ! {
+    uw::_Unwind_Resume(p as *mut uw::_Unwind_Exception)
 }
 
 // Frame unwind info registration

src/libpanic_unwind/lib.rs

@@ -30,6 +30,7 @@
 #![feature(raw)]
 #![panic_runtime]
 #![feature(panic_runtime)]
+#![allow(dead_code)]
 
 use alloc::boxed::Box;
 use core::any::Any;

src/librustc/middle/lang_items.rs

@@ -385,7 +385,7 @@ language_item_table! {
     StartFnLangItem,             "start",              start_fn,                Target::Fn;
 
     EhPersonalityLangItem,       "eh_personality",     eh_personality,          Target::Fn;
-    EhUnwindResumeLangItem,      "eh_unwind_resume",   eh_unwind_resume,        Target::Fn;
+    EhUnwindResumeLangItem,      "eh_unwind_resume",   eh_unwind_resume,        Target::Static;
     EhCatchTypeinfoLangItem,     "eh_catch_typeinfo",  eh_catch_typeinfo,       Target::Static;
 
     OwnedBoxLangItem,            "owned_box",          owned_box,               Target::Struct;

src/libunwind/lib.rs

@@ -4,6 +4,7 @@
 #![feature(nll)]
 #![feature(staged_api)]
 #![feature(unwind_attributes)]
+#![feature(lang_items)]
 #![feature(static_nobundle)]
 #![cfg_attr(not(target_env = "msvc"), feature(libc))]