Update MIR passes that assumed inline can never unwind.

Author: luqmana

compiler/rustc_mir_transform/src/abort_unwinding_calls.rs

@@ -1,4 +1,5 @@
 use crate::MirPass;
+use rustc_ast::InlineAsmOptions;
 use rustc_hir::def::DefKind;
 use rustc_middle::mir::*;
 use rustc_middle::ty::layout;
@@ -85,6 +86,12 @@ impl<'tcx> MirPass<'tcx> for AbortUnwindingCalls {
                 TerminatorKind::Assert { .. } | TerminatorKind::FalseUnwind { .. } => {
                     layout::fn_can_unwind(tcx, None, Abi::Rust)
                 }
+                TerminatorKind::InlineAsm { options, .. } => {
+                    options.contains(InlineAsmOptions::MAY_UNWIND)
+                }
+                _ if terminator.unwind().is_some() => {
+                    span_bug!(span, "unexpected terminator that may unwind {:?}", terminator)
+                }
                 _ => continue,
             };
 

compiler/rustc_mir_transform/src/generator.rs

@@ -1042,8 +1042,7 @@ fn can_unwind<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) -> bool {
             | TerminatorKind::Unreachable
             | TerminatorKind::GeneratorDrop
             | TerminatorKind::FalseEdge { .. }
-            | TerminatorKind::FalseUnwind { .. }
-            | TerminatorKind::InlineAsm { .. } => {}
+            | TerminatorKind::FalseUnwind { .. } => {}
 
             // Resume will *continue* unwinding, but if there's no other unwinding terminator it
             // will never be reached.
@@ -1057,6 +1056,7 @@ fn can_unwind<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) -> bool {
             TerminatorKind::Drop { .. }
             | TerminatorKind::DropAndReplace { .. }
             | TerminatorKind::Call { .. }
+            | TerminatorKind::InlineAsm { .. }
             | TerminatorKind::Assert { .. } => return true,
         }
     }