diff options
| -rw-r--r-- | compiler/rustc_mir_transform/src/abort_unwinding_calls.rs | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs b/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs index d889bc90c9d..84c8a91b082 100644 --- a/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs +++ b/compiler/rustc_mir_transform/src/abort_unwinding_calls.rs @@ -51,11 +51,20 @@ impl<'tcx> crate::MirPass<'tcx> for AbortUnwindingCalls { // This will filter to functions with `extern "C-unwind"` ABIs, for // example. for block in body.basic_blocks.as_mut() { + let Some(terminator) = &mut block.terminator else { continue }; + let span = terminator.source_info.span; + + // If we see an `UnwindResume` terminator inside a function that cannot unwind, we need + // to replace it with `UnwindTerminate`. + if let TerminatorKind::UnwindResume = &terminator.kind + && !body_can_unwind + { + terminator.kind = TerminatorKind::UnwindTerminate(UnwindTerminateReason::Abi); + } + if block.is_cleanup { continue; } - let Some(terminator) = &block.terminator else { continue }; - let span = terminator.source_info.span; let call_can_unwind = match &terminator.kind { TerminatorKind::Call { func, .. } => { @@ -87,14 +96,18 @@ impl<'tcx> crate::MirPass<'tcx> for AbortUnwindingCalls { if !call_can_unwind { // If this function call can't unwind, then there's no need for it // to have a landing pad. This means that we can remove any cleanup - // registered for it. + // registered for it (and turn it into `UnwindAction::Unreachable`). let cleanup = block.terminator_mut().unwind_mut().unwrap(); *cleanup = UnwindAction::Unreachable; - } else if !body_can_unwind { + } else if !body_can_unwind + && matches!(terminator.unwind(), Some(UnwindAction::Continue)) + { // Otherwise if this function can unwind, then if the outer function // can also unwind there's nothing to do. If the outer function - // can't unwind, however, we need to change the landing pad for this - // function call to one that aborts. + // can't unwind, however, we need to ensure that any `UnwindAction::Continue` + // is replaced with terminate. For those with `UnwindAction::Cleanup`, + // cleanup will still happen, and terminate will happen afterwards handled by + // the `UnwindResume` -> `UnwindTerminate` terminator replacement. let cleanup = block.terminator_mut().unwind_mut().unwrap(); *cleanup = UnwindAction::Terminate(UnwindTerminateReason::Abi); } |