[miri] Throw UB if target size and data size don't match #71569
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If an extern C function is defined as
```
extern "C" {
fn malloc(size: u32) -> *mut std::ffi::c_void;
}
```
on a 64-bit machine(ie. pointer sizes don't match), throw an undefined
behaviour.
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@samrat thanks a lot, this looks great! I just have some minor nits. |
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I adjusted style a bit more as I had missed that before. Thanks! @bors r+ rollup |
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Rollup of 5 pull requests Successful merges: - rust-lang#71421 (Add a function to turn Box<T> into Box<[T]>) - rust-lang#71537 (Remove support for self-opening) - rust-lang#71551 (Minor refactoring around IndexVec usage in generator transformation) - rust-lang#71569 ([miri] Throw UB if target size and data size don't match) - rust-lang#71576 (check that `AsRef` and `AsMut` are inlined) Failed merges: - rust-lang#71558 (Cleanup and document `-Z tls-model` ) r? @ghost
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Issue: rust-lang/miri#1355
If an extern C function is defined as
on a 64-bit machine(ie. pointer sizes don't match), return undefined behaviour from Miri when converting the argument into machine_usize