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Add comment to cleanup_kinds #105194

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Jan 11, 2023
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Add comment to cleanup_kinds #105194

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3 changes: 3 additions & 0 deletions compiler/rustc_codegen_ssa/src/mir/analyze.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -261,6 +261,9 @@ impl CleanupKind {
}
}

/// MSVC requires unwinding code to be split to a tree of *funclets*, where each funclet can only
/// branch to itself or to its parent. Luckily, the code we generates matches this pattern.
/// Recover that structure in an analyze pass.
pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKind> {
fn discover_masters<'tcx>(
result: &mut IndexVec<mir::BasicBlock, CleanupKind>,
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