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rust/compiler/rustc_middle
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Matthias Krüger eb8114bad7
Rollup merge of #128277 - RalfJung:offset_from_wildcard, r=oli-obk 
miri: fix offset_from behavior on wildcard pointers

offset_from wouldn't behave correctly when the "end" pointer was a wildcard pointer (result of an int2ptr cast) just at the end of the allocation. Fix that by expressing the "same allocation" check in terms of two `check_ptr_access_signed` instead of something specific to offset_from, which is both more canonical and works better with wildcard pointers.

The second commit just improves diagnostics: I wanted the "pointer is dangling (has no provenance)" message to say how many bytes of memory it expected to see (since if it were 0 bytes, this would actually be legal, so it's good to tell the user that it's not 0 bytes). And then I was annoying that the error looks so different for when you deref a dangling pointer vs an out-of-bounds pointer so I made them more similar.

Fixes https://github.com/rust-lang/miri/issues/3767
2024-07-29 11:42:34 +02:00
..
src Rollup merge of #128277 - RalfJung:offset_from_wildcard, r=oli-obk 2024-07-29 11:42:34 +02:00
Cargo.toml Auto merge of #127042 - GrigorenkoPV:derivative, r=compiler-errors 2024-07-25 22:50:58 +00:00
messages.ftl Re-implement a type-size based limit 2024-07-02 15:48:48 -04:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.