Auto merge of rust-lang#106371 - RalfJung:no-ret-position-noalias, r=nikic

do not add noalias in return position

`noalias` as a return attribute in LLVM indicates that the returned pointer does not alias anything else that is reachable from the caller, *including things reachable before this function call*. This is clearly not the case with a function like `fn id(Box<T>) -> Box<T>`, so we cannot use this attribute.

Fixes rust-lang/unsafe-code-guidelines#385 (including an actual miscompilation that `@comex` managed to produce).

Author: bors

compiler/rustc_ty_utils/src/abi.rs

@@ -273,9 +273,11 @@ fn adjust_for_rust_scalar<'tcx>(
                 | PointerKind::UniqueBorrowed
                 | PointerKind::UniqueBorrowedPinned => false,
                 PointerKind::UniqueOwned => noalias_for_box,
-                PointerKind::Frozen => !is_return,
+                PointerKind::Frozen => true,
             };
-            if no_alias {
+            // We can never add `noalias` in return position; that LLVM attribute has some very surprising semantics
+            // (see <https://github.com/rust-lang/unsafe-code-guidelines/issues/385#issuecomment-1368055745>).
+            if no_alias && !is_return {
                 attrs.set(ArgAttribute::NoAlias);
             }
 

src/test/codegen/function-arguments.rs

@@ -145,7 +145,7 @@ pub fn raw_struct(_: *const S) {
 
 // `Box` can get deallocated during execution of the function, so it should
 // not get `dereferenceable`.
-// CHECK: noalias noundef nonnull align 4 {{i32\*|ptr}} @_box({{i32\*|ptr}} noalias noundef nonnull align 4 %x)
+// CHECK: noundef nonnull align 4 {{i32\*|ptr}} @_box({{i32\*|ptr}} noalias noundef nonnull align 4 %x)
 #[no_mangle]
 pub fn _box(x: Box<i32>) -> Box<i32> {
   x