We can apply nocf_check as a hack for now.

Same idea but for AArch64.

Fixes rust-lang#99221

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

… r=thomcc

Add assertion that `transmute_copy`'s U is not larger than T

This is called out as a safety requirement in the docs, but because knowing this can be done at compile time and constant folded (just like the `align_of` branch is removed), we can just panic here.

I've looked at the asm (using `cargo-asm`) of a function that both is correct and incorrect, and the panic is completely removed, or is unconditional, without needing build-std.

I don't expect this to cause much breakage in the wild. I scanned through https://miri.saethlin.dev/ub for issues that would look like this (error: Undefined Behavior: memory access failed: alloc1768 has size 1, so pointer to 8 bytes starting at offset 0 is out-of-bounds), but couldn't find any.

That doesn't rule out it happening in crates tested that fail earlier for some other reason, though, but it indicates that doing this is rare, if it happens at all. A crater run for this would need to be build and test, since this is a runtime thing.

Also added a few more transmute_copy tests.

…es-enforcement-technology, r=Amanieu

Remove branch target prologues from `#[naked] fn`

This patch hacks around rust-lang#98768 for now via injecting appropriate attributes into the LLVMIR we emit for naked functions. I intend to pursue this upstream so that these attributes can be removed in general, but it's slow going wading through C++ for me.

add missing null ptr check in alloc example

`alloc` can return null on OOM, if I understood correctly. So we should never just deref a pointer we get from `alloc`.

…rules-w-same-name, r=GuillaumeGomez

rustdoc: avoid inlining items with duplicate `(type, name)`

Fixes rust-lang#99221

… r=davidtwco

Use `typeck_results` to get accurate qpath res for arg mismatch error

Improves error message from "function"  to actually what we're calling (e.g. enum variant constrcutor) in a few cases 😸

interpret/visitor: add missing early return

I forgot to add this when adding the special `Box` handling branch.

r? ```@oli-obk```

…rrors

Add regression test for rust-lang#95230

Closes rust-lang#95230
r? ```@compiler-errors```

Signed-off-by: Yuki Okushi <jtitor@2k36.org>