Add UnwindAction::Terminate

compiler/rustc_middle/src/mir/patch.rs

@@ -14,6 +14,7 @@ pub struct MirPatch<'tcx> {
     resume_block: Option<BasicBlock>,
     // Only for unreachable in cleanup path.
     unreachable_block: Option<BasicBlock>,
+    terminate_block: Option<BasicBlock>,
     body_span: Span,
     next_local: usize,
 }
@@ -28,6 +29,7 @@ impl<'tcx> MirPatch<'tcx> {
             next_local: body.local_decls.len(),
             resume_block: None,
             unreachable_block: None,
+            terminate_block: None,
             body_span: body.span,
         };
 

compiler/rustc_middle/src/mir/syntax.rs

@@ -763,6 +763,10 @@ pub enum UnwindAction {
     Continue,
     /// Triggers undefined behavior if unwind happens.
     Unreachable,
+    /// Terminates the execution if unwind happens.
+    ///
+    /// Depending on the platform and situation this may cause a non-unwindable panic or abort.
+    Terminate,
     /// Cleanups to be done.
     Cleanup(BasicBlock),
 }

compiler/rustc_middle/src/mir/terminator.rs

@@ -274,6 +274,7 @@ impl<'tcx> Debug for TerminatorKind<'tcx> {
             // Not needed or included in successors
             None | Some(UnwindAction::Continue) | Some(UnwindAction::Cleanup(_)) => None,
             Some(UnwindAction::Unreachable) => Some("unwind unreachable"),
+            Some(UnwindAction::Terminate) => Some("unwind terminate"),
         };
 
         match (successor_count, unwind) {