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

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.
2023-09-08 11:56:08 +00:00
parent 9be4eac264 e726be21ab
commit cd71a37f32
17 changed files with 1305 additions and 175 deletions
--- a/compiler/rustc_ty_utils/src/abi.rs
+++ b/compiler/rustc_ty_utils/src/abi.rs
@@ -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) {