388 lines
12 KiB
Rust
388 lines
12 KiB
Rust
//@ check-pass
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//@ revisions: host
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//@ revisions: i686
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//@[i686] compile-flags: --target i686-unknown-linux-gnu
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//@[i686] needs-llvm-components: x86
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//@ revisions: x86-64
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//@[x86-64] compile-flags: --target x86_64-unknown-linux-gnu
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//@[x86-64] needs-llvm-components: x86
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//@ revisions: x86-64-win
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//@[x86-64-win] compile-flags: --target x86_64-pc-windows-msvc
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//@[x86-64-win] needs-llvm-components: x86
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//@ revisions: arm
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//@[arm] compile-flags: --target arm-unknown-linux-gnueabi
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//@[arm] needs-llvm-components: arm
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//@ revisions: aarch64
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//@[aarch64] compile-flags: --target aarch64-unknown-linux-gnu
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//@[aarch64] needs-llvm-components: aarch64
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//@ revisions: s390x
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//@[s390x] compile-flags: --target s390x-unknown-linux-gnu
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//@[s390x] needs-llvm-components: systemz
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//@ revisions: mips
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//@[mips] compile-flags: --target mips-unknown-linux-gnu
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//@[mips] needs-llvm-components: mips
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//@ revisions: mips64
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//@[mips64] compile-flags: --target mips64-unknown-linux-gnuabi64
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//@[mips64] needs-llvm-components: mips
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//@ revisions: sparc
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//@[sparc] compile-flags: --target sparc-unknown-linux-gnu
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//@[sparc] needs-llvm-components: sparc
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//@ revisions: sparc64
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//@[sparc64] compile-flags: --target sparc64-unknown-linux-gnu
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//@[sparc64] needs-llvm-components: sparc
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//@ revisions: powerpc64
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//@[powerpc64] compile-flags: --target powerpc64-unknown-linux-gnu
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//@[powerpc64] needs-llvm-components: powerpc
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//@ revisions: riscv
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//@[riscv] compile-flags: --target riscv64gc-unknown-linux-gnu
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//@[riscv] needs-llvm-components: riscv
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//@ revisions: loongarch64
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//@[loongarch64] compile-flags: --target loongarch64-unknown-linux-gnu
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//@[loongarch64] needs-llvm-components: loongarch
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//@[loongarch64] min-llvm-version: 18
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//@ revisions: wasm
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//@[wasm] compile-flags: --target wasm32-unknown-unknown
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//@[wasm] needs-llvm-components: webassembly
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//@ revisions: wasip1
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//@[wasip1] compile-flags: --target wasm32-wasip1
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//@[wasip1] needs-llvm-components: webassembly
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//@ revisions: bpf
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//@[bpf] compile-flags: --target bpfeb-unknown-none
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//@[bpf] needs-llvm-components: bpf
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//@ revisions: m68k
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//@[m68k] compile-flags: --target m68k-unknown-linux-gnu
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//@[m68k] needs-llvm-components: m68k
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// FIXME: disabled on nvptx64 since the target ABI fails the sanity check
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// see https://github.com/rust-lang/rust/issues/117480
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/* revisions: nvptx64
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[nvptx64] compile-flags: --target nvptx64-nvidia-cuda
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[nvptx64] needs-llvm-components: nvptx
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*/
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// FIXME: disabled since it fails on CI saying the csky component is missing
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/* revisions: csky
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[csky] compile-flags: --target csky-unknown-linux-gnuabiv2
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[csky] needs-llvm-components: csky
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*/
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#![feature(rustc_attrs, unsized_fn_params, transparent_unions)]
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#![cfg_attr(not(host), feature(no_core, lang_items), no_std, no_core)]
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#![allow(unused, improper_ctypes_definitions, internal_features)]
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// FIXME: some targets are broken in various ways.
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// Hence there are `cfg` throughout this test to disable parts of it on those targets.
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// sparc64: https://github.com/rust-lang/rust/issues/115336
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// mips64: https://github.com/rust-lang/rust/issues/115404
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#[cfg(host)]
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use std::{
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any::Any, marker::PhantomData, mem::ManuallyDrop, num::NonZero, ptr::NonNull, rc::Rc,
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sync::Arc,
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};
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/// To work cross-target this test must be no_core.
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/// This little prelude supplies what we need.
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#[cfg(not(host))]
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mod prelude {
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#[lang = "sized"]
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pub trait Sized {}
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#[lang = "receiver"]
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pub trait Receiver {}
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impl<T: ?Sized> Receiver for &T {}
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impl<T: ?Sized> Receiver for &mut T {}
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#[lang = "copy"]
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pub trait Copy: Sized {}
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impl Copy for i32 {}
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impl Copy for f32 {}
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impl<T: ?Sized> Copy for &T {}
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impl<T: ?Sized> Copy for *const T {}
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impl<T: ?Sized> Copy for *mut T {}
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#[lang = "clone"]
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pub trait Clone: Sized {
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fn clone(&self) -> Self;
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}
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#[lang = "phantom_data"]
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pub struct PhantomData<T: ?Sized>;
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impl<T: ?Sized> Copy for PhantomData<T> {}
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#[lang = "unsafe_cell"]
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#[repr(transparent)]
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pub struct UnsafeCell<T: ?Sized> {
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value: T,
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}
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pub trait Any: 'static {}
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pub enum Option<T> {
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None,
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Some(T),
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}
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impl<T: Copy> Copy for Option<T> {}
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pub enum Result<T, E> {
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Ok(T),
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Err(E),
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}
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impl<T: Copy, E: Copy> Copy for Result<T, E> {}
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#[lang = "manually_drop"]
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#[repr(transparent)]
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pub struct ManuallyDrop<T: ?Sized> {
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value: T,
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}
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impl<T: Copy + ?Sized> Copy for ManuallyDrop<T> {}
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#[repr(transparent)]
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#[rustc_layout_scalar_valid_range_start(1)]
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#[rustc_nonnull_optimization_guaranteed]
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pub struct NonNull<T: ?Sized> {
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pointer: *const T,
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}
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impl<T: ?Sized> Copy for NonNull<T> {}
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#[repr(transparent)]
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#[rustc_layout_scalar_valid_range_start(1)]
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#[rustc_nonnull_optimization_guaranteed]
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pub struct NonZero<T>(T);
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// This just stands in for a non-trivial type.
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pub struct Vec<T> {
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ptr: NonNull<T>,
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cap: usize,
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len: usize,
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}
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pub struct Unique<T: ?Sized> {
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pub pointer: NonNull<T>,
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pub _marker: PhantomData<T>,
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}
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#[lang = "global_alloc_ty"]
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pub struct Global;
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#[lang = "owned_box"]
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pub struct Box<T: ?Sized, A = Global>(Unique<T>, A);
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#[repr(C)]
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struct RcBox<T: ?Sized> {
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strong: UnsafeCell<usize>,
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weak: UnsafeCell<usize>,
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value: T,
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}
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pub struct Rc<T: ?Sized, A = Global> {
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ptr: NonNull<RcBox<T>>,
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phantom: PhantomData<RcBox<T>>,
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alloc: A,
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}
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#[repr(C, align(8))]
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struct AtomicUsize(usize);
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#[repr(C)]
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struct ArcInner<T: ?Sized> {
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strong: AtomicUsize,
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weak: AtomicUsize,
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data: T,
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}
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pub struct Arc<T: ?Sized, A = Global> {
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ptr: NonNull<ArcInner<T>>,
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phantom: PhantomData<ArcInner<T>>,
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alloc: A,
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}
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}
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#[cfg(not(host))]
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use prelude::*;
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macro_rules! assert_abi_compatible {
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($name:ident, $t1:ty, $t2:ty) => {
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mod $name {
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use super::*;
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// Declaring a `type` doesn't even check well-formedness, so we also declare a function.
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fn check_wf(_x: $t1, _y: $t2) {}
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// Test argument and return value, `Rust` and `C` ABIs.
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#[rustc_abi(assert_eq)]
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type TestRust = (fn($t1) -> $t1, fn($t2) -> $t2);
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#[rustc_abi(assert_eq)]
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type TestC = (extern "C" fn($t1) -> $t1, extern "C" fn($t2) -> $t2);
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}
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};
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}
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struct Zst;
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impl Copy for Zst {}
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impl Clone for Zst {
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fn clone(&self) -> Self {
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Zst
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}
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}
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#[repr(C)]
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struct ReprC1<T: ?Sized>(T);
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#[repr(C)]
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struct ReprC2Int<T>(i32, T);
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#[repr(C)]
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struct ReprC2Float<T>(f32, T);
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#[repr(C)]
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struct ReprC4<T>(T, Vec<i32>, Zst, T);
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#[repr(C)]
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struct ReprC4Mixed<T>(T, f32, i32, T);
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#[repr(C)]
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enum ReprCEnum<T> {
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Variant1,
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Variant2(T),
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}
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#[repr(C)]
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union ReprCUnion<T> {
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nothing: (),
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something: ManuallyDrop<T>,
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}
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macro_rules! test_abi_compatible {
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($name:ident, $t1:ty, $t2:ty) => {
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mod $name {
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use super::*;
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assert_abi_compatible!(plain, $t1, $t2);
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// We also do some tests with differences in fields of `repr(C)` types.
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assert_abi_compatible!(repr_c_1, ReprC1<$t1>, ReprC1<$t2>);
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assert_abi_compatible!(repr_c_2_int, ReprC2Int<$t1>, ReprC2Int<$t2>);
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assert_abi_compatible!(repr_c_2_float, ReprC2Float<$t1>, ReprC2Float<$t2>);
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assert_abi_compatible!(repr_c_4, ReprC4<$t1>, ReprC4<$t2>);
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assert_abi_compatible!(repr_c_4mixed, ReprC4Mixed<$t1>, ReprC4Mixed<$t2>);
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assert_abi_compatible!(repr_c_enum, ReprCEnum<$t1>, ReprCEnum<$t2>);
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assert_abi_compatible!(repr_c_union, ReprCUnion<$t1>, ReprCUnion<$t2>);
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}
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};
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}
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// Compatibility of pointers.
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test_abi_compatible!(ptr_mut, *const i32, *mut i32);
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test_abi_compatible!(ptr_pointee, *const i32, *const Vec<i32>);
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test_abi_compatible!(ref_mut, &i32, &mut i32);
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test_abi_compatible!(ref_ptr, &i32, *const i32);
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test_abi_compatible!(box_ptr, Box<i32>, *const i32);
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test_abi_compatible!(nonnull_ptr, NonNull<i32>, *const i32);
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test_abi_compatible!(fn_fn, fn(), fn(i32) -> i32);
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// Compatibility of integer types.
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test_abi_compatible!(char_uint, char, u32);
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#[cfg(target_pointer_width = "32")]
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test_abi_compatible!(isize_int, isize, i32);
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#[cfg(target_pointer_width = "64")]
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test_abi_compatible!(isize_int, isize, i64);
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// Compatibility of 1-ZST.
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test_abi_compatible!(zst_unit, Zst, ());
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#[cfg(not(any(target_arch = "sparc64")))]
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test_abi_compatible!(zst_array, Zst, [u8; 0]);
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test_abi_compatible!(nonzero_int, NonZero<i32>, i32);
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// `DispatchFromDyn` relies on ABI compatibility.
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// This is interesting since these types are not `repr(transparent)`. So this is not part of our
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// public ABI guarantees, but is relied on by the compiler.
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test_abi_compatible!(rc, Rc<i32>, *mut i32);
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test_abi_compatible!(arc, Arc<i32>, *mut i32);
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// `repr(transparent)` compatibility.
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#[repr(transparent)]
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struct Wrapper1<T: ?Sized>(T);
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#[repr(transparent)]
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struct Wrapper2<T: ?Sized>((), Zst, T);
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#[repr(transparent)]
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struct Wrapper3<T>(T, [u8; 0], PhantomData<u64>);
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#[repr(transparent)]
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union WrapperUnion<T> {
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nothing: (),
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something: ManuallyDrop<T>,
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}
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macro_rules! test_transparent {
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($name:ident, $t:ty) => {
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mod $name {
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use super::*;
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test_abi_compatible!(wrap1, $t, Wrapper1<$t>);
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test_abi_compatible!(wrap2, $t, Wrapper2<$t>);
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test_abi_compatible!(wrap3, $t, Wrapper3<$t>);
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test_abi_compatible!(wrap4, $t, WrapperUnion<$t>);
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}
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};
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}
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test_transparent!(simple, i32);
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test_transparent!(reference, &'static i32);
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test_transparent!(zst, Zst);
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test_transparent!(unit, ());
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test_transparent!(enum_, Option<i32>);
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test_transparent!(enum_niched, Option<&'static i32>);
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#[cfg(not(any(target_arch = "mips64", target_arch = "sparc64")))]
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mod tuples {
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use super::*;
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// mixing in some floats since they often get special treatment
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test_transparent!(pair, (i32, f32));
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// chosen to fit into 64bit
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test_transparent!(triple, (i8, i16, f32));
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// Pure-float types that are not ScalarPair seem to be tricky.
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test_transparent!(triple_f32, (f32, f32, f32));
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test_transparent!(triple_f64, (f64, f64, f64));
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// and also something that's larger than 2 pointers
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test_transparent!(tuple, (i32, f32, i64, f64));
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}
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// Some targets have special rules for arrays.
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#[cfg(not(any(target_arch = "mips64", target_arch = "sparc64")))]
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mod arrays {
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use super::*;
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test_transparent!(empty_array, [u32; 0]);
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test_transparent!(empty_1zst_array, [u8; 0]);
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test_transparent!(small_array, [i32; 2]); // chosen to fit into 64bit
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test_transparent!(large_array, [i32; 16]);
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}
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// Some tests with unsized types (not all wrappers are compatible with that).
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macro_rules! test_transparent_unsized {
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($name:ident, $t:ty) => {
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mod $name {
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use super::*;
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assert_abi_compatible!(wrap1, $t, Wrapper1<$t>);
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assert_abi_compatible!(wrap1_reprc, ReprC1<$t>, ReprC1<Wrapper1<$t>>);
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assert_abi_compatible!(wrap2, $t, Wrapper2<$t>);
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assert_abi_compatible!(wrap2_reprc, ReprC1<$t>, ReprC1<Wrapper2<$t>>);
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}
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};
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}
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#[cfg(not(any(target_arch = "mips64", target_arch = "sparc64")))]
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mod unsized_ {
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use super::*;
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test_transparent_unsized!(str_, str);
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test_transparent_unsized!(slice, [u8]);
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test_transparent_unsized!(slice_with_prefix, (usize, [u8]));
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test_transparent_unsized!(dyn_trait, dyn Any);
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}
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// RFC 3391 <https://rust-lang.github.io/rfcs/3391-result_ffi_guarantees.html>.
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macro_rules! test_nonnull {
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($name:ident, $t:ty) => {
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mod $name {
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use super::*;
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test_abi_compatible!(option, Option<$t>, $t);
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test_abi_compatible!(result_err_unit, Result<$t, ()>, $t);
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test_abi_compatible!(result_ok_unit, Result<(), $t>, $t);
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test_abi_compatible!(result_err_zst, Result<$t, Zst>, $t);
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test_abi_compatible!(result_ok_zst, Result<Zst, $t>, $t);
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test_abi_compatible!(result_err_arr, Result<$t, [i8; 0]>, $t);
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test_abi_compatible!(result_ok_arr, Result<[i8; 0], $t>, $t);
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}
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}
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}
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test_nonnull!(ref_, &i32);
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test_nonnull!(mut_, &mut i32);
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test_nonnull!(ref_unsized, &[i32]);
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test_nonnull!(mut_unsized, &mut [i32]);
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test_nonnull!(fn_, fn());
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test_nonnull!(nonnull, NonNull<i32>);
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test_nonnull!(nonnull_unsized, NonNull<dyn Any>);
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test_nonnull!(non_zero, NonZero<i32>);
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fn main() {}
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