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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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10
compiler/rustc_codegen_cranelift/src/base.rs
View file

@ -417,6 +417,16 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
Some(source_info.span),
);
}
AssertKind::NullPointerDereference => {
let location = fx.get_caller_location(source_info).load_scalar(fx);
codegen_panic_inner(
fx,
rustc_hir::LangItem::PanicNullPointerDereference,
&[location],
Some(source_info.span),
)
}
_ => {
let location = fx.get_caller_location(source_info).load_scalar(fx);