Rollup merge of rust-lang#148994 - folkertdev:abi-compatibility-cleanup, r=jieyouxu

Abi compatibility test cleanup

r? `@jieyouxu`

- moves `NonNull` (and some friends) into `minicore.rs` so it can be re-used.
- tests the abi compatibility of a couple more targets. It's useful to have a comprehensive overview of all ABIs that rust has some amount of support for, e.g. testing for c-variadic or guaranteed tail calls (cc rust-lang#148748)

Author: Zalathar

tests/auxiliary/minicore.rs

@@ -119,6 +119,24 @@ pub struct ManuallyDrop<T: PointeeSized> {
 }
 impl<T: Copy + PointeeSized> Copy for ManuallyDrop<T> {}
 
+#[repr(transparent)]
+#[rustc_layout_scalar_valid_range_start(1)]
+#[rustc_nonnull_optimization_guaranteed]
+pub struct NonNull<T: ?Sized> {
+    pointer: *const T,
+}
+impl<T: ?Sized> Copy for NonNull<T> {}
+
+#[repr(transparent)]
+#[rustc_layout_scalar_valid_range_start(1)]
+#[rustc_nonnull_optimization_guaranteed]
+pub struct NonZero<T>(T);
+
+pub struct Unique<T: ?Sized> {
+    pub pointer: NonNull<T>,
+    pub _marker: PhantomData<T>,
+}
+
 #[lang = "unsafe_cell"]
 #[repr(transparent)]
 pub struct UnsafeCell<T: PointeeSized> {

tests/ui/abi/compatibility.rs

@@ -13,6 +13,9 @@
 //@ revisions: arm
 //@[arm] compile-flags: --target arm-unknown-linux-gnueabi
 //@[arm] needs-llvm-components: arm
+//@ revisions: thumb
+//@[thumb] compile-flags: --target thumbv8m.main-none-eabi
+//@[thumb] needs-llvm-components: arm
 //@ revisions: aarch64
 //@[aarch64] compile-flags: --target aarch64-unknown-linux-gnu
 //@[aarch64] needs-llvm-components: aarch64
@@ -31,12 +34,21 @@
 //@ revisions: sparc64
 //@[sparc64] compile-flags: --target sparc64-unknown-linux-gnu
 //@[sparc64] needs-llvm-components: sparc
+//@ revisions: powerpc
+//@[powerpc] compile-flags: --target powerpc-unknown-linux-gnu
+//@[powerpc] needs-llvm-components: powerpc
 //@ revisions: powerpc64
 //@[powerpc64] compile-flags: --target powerpc64-unknown-linux-gnu
 //@[powerpc64] needs-llvm-components: powerpc
+//@ revisions: aix
+//@[aix] compile-flags: --target powerpc64-ibm-aix
+//@[aix] needs-llvm-components: powerpc
 //@ revisions: riscv
 //@[riscv] compile-flags: --target riscv64gc-unknown-linux-gnu
 //@[riscv] needs-llvm-components: riscv
+//@ revisions: loongarch32
+//@[loongarch32] compile-flags: --target loongarch32-unknown-none
+//@[loongarch32] needs-llvm-components: loongarch
 //@ revisions: loongarch64
 //@[loongarch64] compile-flags: --target loongarch64-unknown-linux-gnu
 //@[loongarch64] needs-llvm-components: loongarch
@@ -87,31 +99,13 @@ mod prelude {
         fn clone(&self) -> Self;
     }
 
-    #[repr(transparent)]
-    #[rustc_layout_scalar_valid_range_start(1)]
-    #[rustc_nonnull_optimization_guaranteed]
-    pub struct NonNull<T: ?Sized> {
-        pointer: *const T,
-    }
-    impl<T: ?Sized> Copy for NonNull<T> {}
-
-    #[repr(transparent)]
-    #[rustc_layout_scalar_valid_range_start(1)]
-    #[rustc_nonnull_optimization_guaranteed]
-    pub struct NonZero<T>(T);
-
     // This just stands in for a non-trivial type.
     pub struct Vec<T> {
         ptr: NonNull<T>,
         cap: usize,
         len: usize,
     }
 
-    pub struct Unique<T: ?Sized> {
-        pub pointer: NonNull<T>,
-        pub _marker: PhantomData<T>,
-    }
-
     #[lang = "global_alloc_ty"]
     pub struct Global;
 

tests/ui/cmse-nonsecure/cmse-nonsecure-entry/c-variadic.rs

@@ -31,9 +31,8 @@ async unsafe extern "cmse-nonsecure-entry" fn async_is_not_allowed() {
 // this file, but they may be moved into `minicore` if/when other `#[no_core]` tests want to use
 // them.
 
-// NOTE: in `core` this type uses `NonNull`.
 #[lang = "ResumeTy"]
-pub struct ResumeTy(*mut Context<'static>);
+pub struct ResumeTy(NonNull<Context<'static>>);
 
 #[lang = "future_trait"]
 pub trait Future {