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add log warnings for when we overwrite parts of a pointer, and de-init the rest

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This commit is contained in:
Ralf Jung 2022-04-17 17:26:15 -04:00
parent ad4e98ed7d
commit 5640304c63
1 changed files with 8 additions and 0 deletions
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8
compiler/rustc_middle/src/mir/interpret/allocation.rs
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@ -509,6 +509,9 @@ impl<Tag: Copy, Extra> Allocation<Tag, Extra> {
if Tag::ERR_ON_PARTIAL_PTR_OVERWRITE {
return Err(AllocError::PartialPointerOverwrite(first));
}
warn!(
"Partial pointer overwrite! De-initializing memory at offsets {first:?}..{start:?}."
);
self.init_mask.set_range(first, start, false);
}
if last > end {
@ -517,10 +520,15 @@ impl<Tag: Copy, Extra> Allocation<Tag, Extra> {
last - cx.data_layout().pointer_size,
));
}
warn!(
"Partial pointer overwrite! De-initializing memory at offsets {end:?}..{last:?}."
);
self.init_mask.set_range(end, last, false);
}
// Forget all the relocations.
// Since relocations do not overlap, we know that removing until `last` (exclusive) is fine,
// i.e., this will not remove any other relocations just after the ones we care about.
self.relocations.0.remove_range(first..last);
Ok(())