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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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5
compiler/rustc_codegen_ssa/src/mir/block.rs
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@ -713,6 +713,11 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
// and `#[track_caller]` adds an implicit third argument.
(LangItem::PanicMisalignedPointerDereference, vec![required, found, location])
}
AssertKind::NullPointerDereference => {
// It's `fn panic_null_pointer_dereference()`,
// `#[track_caller]` adds an implicit argument.
(LangItem::PanicNullPointerDereference, vec![location])
}
_ => {
// It's `pub fn panic_...()` and `#[track_caller]` adds an implicit argument.
(msg.panic_function(), vec![location])