Rollup merge of #112972 - nbdd0121:mir, r=davidtwco

Make `UnwindAction::Continue` explicit in MIR dump

Makes it easier to spot unwinding related issues in MIR by making `UnwindAction::Continue` explicit, just like all other `UnwindAction`s.

Author: matthiaskrgr

compiler/rustc_middle/src/mir/terminator.rs

@@ -272,7 +272,8 @@ impl<'tcx> Debug for TerminatorKind<'tcx> {
 
         let unwind = match self.unwind() {
             // Not needed or included in successors
-            None | Some(UnwindAction::Continue) | Some(UnwindAction::Cleanup(_)) => None,
+            None | Some(UnwindAction::Cleanup(_)) => None,
+            Some(UnwindAction::Continue) => Some("unwind continue"),
             Some(UnwindAction::Unreachable) => Some("unwind unreachable"),
             Some(UnwindAction::Terminate) => Some("unwind terminate"),
         };

tests/mir-opt/array_index_is_temporary.main.SimplifyCfg-elaborate-drops.after.panic-unwind.mir

@@ -36,7 +36,7 @@ fn main() -> () {
         StorageLive(_5);
         StorageLive(_6);
         _6 = _3;
-        _5 = foo(move _6) -> bb1;
+        _5 = foo(move _6) -> [return: bb1, unwind continue];
     }
 
     bb1: {
@@ -45,7 +45,7 @@ fn main() -> () {
         _7 = _2;
         _8 = Len(_1);
         _9 = Lt(_7, _8);
-        assert(move _9, "index out of bounds: the length is {} but the index is {}", move _8, _7) -> bb2;
+        assert(move _9, "index out of bounds: the length is {} but the index is {}", move _8, _7) -> [success: bb2, unwind continue];
     }
 
     bb2: {

tests/mir-opt/basic_assignment.main.ElaborateDrops.diff

@@ -58,7 +58,7 @@
 
       bb4: {
           StorageDead(_5);
--         drop(_4) -> bb5;
+-         drop(_4) -> [return: bb5, unwind continue];
 +         goto -> bb5;
       }
 

tests/mir-opt/box_expr.main.ElaborateDrops.before.panic-unwind.mir

@@ -19,7 +19,7 @@ fn main() -> () {
         StorageLive(_1);
         _2 = SizeOf(S);
         _3 = AlignOf(S);
-        _4 = alloc::alloc::exchange_malloc(move _2, move _3) -> bb1;
+        _4 = alloc::alloc::exchange_malloc(move _2, move _3) -> [return: bb1, unwind continue];
     }
 
     bb1: {
@@ -30,7 +30,7 @@ fn main() -> () {
 
     bb2: {
         _1 = move _5;
-        drop(_5) -> bb3;
+        drop(_5) -> [return: bb3, unwind continue];
     }
 
     bb3: {
@@ -45,7 +45,7 @@ fn main() -> () {
         StorageDead(_7);
         StorageDead(_6);
         _0 = const ();
-        drop(_1) -> bb5;
+        drop(_1) -> [return: bb5, unwind continue];
     }
 
     bb5: {

tests/mir-opt/building/async_await.a-{closure#0}.generator_resume.0.mir

@@ -30,7 +30,7 @@ fn a::{closure#0}(_1: Pin<&mut [async fn body@$DIR/async_await.rs:11:14: 11:16]>
     }
 
     bb2: {
-        assert(const false, "`async fn` resumed after completion") -> bb2;
+        assert(const false, "`async fn` resumed after completion") -> [success: bb2, unwind continue];
     }
 
     bb3: {

tests/mir-opt/building/async_await.b-{closure#0}.generator_resume.0.mir

@@ -310,7 +310,7 @@ fn b::{closure#0}(_1: Pin<&mut [async fn body@$DIR/async_await.rs:14:18: 17:2]>,
     }
 
     bb28: {
-        assert(const false, "`async fn` resumed after completion") -> bb28;
+        assert(const false, "`async fn` resumed after completion") -> [success: bb28, unwind continue];
     }
 
     bb29: {

tests/mir-opt/building/custom/terminators.direct_call.built.after.mir

@@ -4,7 +4,7 @@ fn direct_call(_1: i32) -> i32 {
     let mut _0: i32;
 
     bb0: {
-        _0 = ident::<i32>(_1) -> bb1;
+        _0 = ident::<i32>(_1) -> [return: bb1, unwind continue];
     }
 
     bb1: {

tests/mir-opt/building/custom/terminators.drop_first.built.after.mir

@@ -4,7 +4,7 @@ fn drop_first(_1: WriteOnDrop<'_>, _2: WriteOnDrop<'_>) -> () {
     let mut _0: ();
 
     bb0: {
-        drop(_1) -> bb1;
+        drop(_1) -> [return: bb1, unwind continue];
     }
 
     bb1: {

tests/mir-opt/building/custom/terminators.drop_second.built.after.mir

@@ -4,7 +4,7 @@ fn drop_second(_1: WriteOnDrop<'_>, _2: WriteOnDrop<'_>) -> () {
     let mut _0: ();
 
     bb0: {
-        drop(_2) -> bb1;
+        drop(_2) -> [return: bb1, unwind continue];
     }
 
     bb1: {

tests/mir-opt/building/custom/terminators.indirect_call.built.after.mir

@@ -4,7 +4,7 @@ fn indirect_call(_1: i32, _2: fn(i32) -> i32) -> i32 {
     let mut _0: i32;
 
     bb0: {
-        _0 = _2(_1) -> bb1;
+        _0 = _2(_1) -> [return: bb1, unwind continue];
     }
 
     bb1: {