MIR validation: reject in-place argument/return for packed fields #115164
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r? @b-naber (rustbot has picked a reviewer for you, use r? to override) |
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RalfJung
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Aug 24, 2023
| let mut has_duplicates = false; | ||
| for arg in args { | ||
| if let Operand::Move(place) = arg { | ||
| has_duplicates |= !self.place_cache.insert(place.as_ref()); | ||
| if is_within_packed(self.tcx, &self.body.local_decls, *place).is_some() { |
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@cjgillot right now this is more strict than your check in #115138. Your pass might introduce move of packed fields if the field happens to not require more alignment anyway (such as a u8 in a packed struct). However determining that requires a param_env and then I'd have to move this check into the TypeChecker... is it really worth allowing such moves?
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My patch uses is_disaligned for simplicity. No objection to using is_with_packed: as simple and more secure.
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@bors r+ rollup |
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Aug 28, 2023
…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#115164 (MIR validation: reject in-place argument/return for packed fields) - rust-lang#115240 (codegen_llvm/llvm_type: avoid matching on the Rust type) - rust-lang#115294 (More precisely detect cycle errors from type_of on opaque) - rust-lang#115310 (Document panic behavior across editions, and improve xrefs) - rust-lang#115311 (Revert "Suggest using `Arc` on `!Send`/`!Sync` types") - rust-lang#115317 (Devacationize oli-obk) - rust-lang#115319 (don't use SnapshotVec in Graph implementation, as it looks unused; use Vec instead) - rust-lang#115322 (Tweak output of `to_pretty_impl_header` involving only anon lifetimes) r? `@ghost` `@rustbot` modify labels: rollup
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As discussed here.