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Insert null checks for pointer dereferences when debug assertions are enabled

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Similar to how the alignment is already checked, this adds a check
for null pointer dereferences in debug mode. It is implemented similarly
to the alignment check as a MirPass.

This is related to a 2025H1 project goal for better UB checks in debug
mode: https://github.com/rust-lang/rust-project-goals/pull/177.
This commit is contained in:
Bastian Kersting 2024-12-17 13:00:22 +00:00
parent 851322b74d
commit b151b513ba
32 changed files with 281 additions and 6 deletions
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3
compiler/rustc_monomorphize/src/collector.rs
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@ -814,6 +814,9 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
mir::AssertKind::MisalignedPointerDereference { .. } => {
push_mono_lang_item(self, LangItem::PanicMisalignedPointerDereference);
}
mir::AssertKind::NullPointerDereference => {
push_mono_lang_item(self, LangItem::PanicNullPointerDereference);
}
_ => {
push_mono_lang_item(self, msg.panic_function());
}