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Auto merge of #115372 - RalfJung:abi-assert-eq, r=davidtwco

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add rustc_abi(assert_eq) to test some guaranteed or at least highly expected ABI compatibility guarantees

This new repr(transparent) test is super useful, it would have found https://github.com/rust-lang/rust/issues/115336 and found https://github.com/rust-lang/rust/issues/115404, https://github.com/rust-lang/rust/issues/115481, https://github.com/rust-lang/rust/issues/115509.
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bors 2023-09-08 11:56:08 +00:00
commit cd71a37f32
17 changed files with 1305 additions and 175 deletions
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2
compiler/rustc_ty_utils/src/abi.rs
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@ -520,6 +520,8 @@ fn fn_abi_adjust_for_abi<'tcx>(
_ => return,
}
// `Aggregate` ABI must be adjusted to ensure that ABI-compatible Rust types are passed
// the same way.
let size = arg.layout.size;
if arg.layout.is_unsized() || size > Pointer(AddressSpace::DATA).size(cx) {