Auto merge of #134424 - 1c3t3a:null-checks, r=saethlin
Insert null checks for pointer dereferences when debug assertions are enabled 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 inserts checks in the same places as the `CheckAlignment` pass and additionally also inserts checks for `Borrows`, so code like ```rust let ptr: *const u32 = std::ptr::null(); let val: &u32 = unsafe { &*ptr }; ``` will have a check inserted on dereference. This is done because null references are UB. The alignment check doesn't cover these places, because in `&(*ptr).field`, the exact requirement is that the final reference must be aligned. This is something to consider further enhancements of the alignment check. For now this is implemented as a separate `MirPass`, to make it easy to disable this check if necessary. 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. r? `@saethlin`
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33 changed files with 551 additions and 164 deletions
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@ -17,6 +17,9 @@ middle_assert_gen_resume_after_panic = `gen` fn or block cannot be further itera
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middle_assert_misaligned_ptr_deref =
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misaligned pointer dereference: address must be a multiple of {$required} but is {$found}
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middle_assert_null_ptr_deref =
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null pointer dereference occurred
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middle_assert_op_overflow =
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attempt to compute `{$left} {$op} {$right}`, which would overflow
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