1 files changed, 431 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_gcc/example/mini_core_hello_world.rs b/compiler/rustc_codegen_gcc/example/mini_core_hello_world.rs
new file mode 100644
index 000000000..14fd9eeff
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/example/mini_core_hello_world.rs
@@ -0,0 +1,431 @@
+// Adapted from https://github.com/sunfishcode/mir2cranelift/blob/master/rust-examples/nocore-hello-world.rs
+
+#![feature(
+    no_core, unboxed_closures, start, lang_items, box_syntax, never_type, linkage,
+    extern_types, thread_local
+)]
+#![no_core]
+#![allow(dead_code, non_camel_case_types)]
+
+extern crate mini_core;
+
+use mini_core::*;
+use mini_core::libc::*;
+
+unsafe extern "C" fn my_puts(s: *const u8) {
+    puts(s);
+}
+
+#[lang = "termination"]
+trait Termination {
+    fn report(self) -> i32;
+}
+
+impl Termination for () {
+    fn report(self) -> i32 {
+        unsafe {
+            NUM = 6 * 7 + 1 + (1u8 == 1u8) as u8; // 44
+            *NUM_REF as i32
+        }
+    }
+}
+
+trait SomeTrait {
+    fn object_safe(&self);
+}
+
+impl SomeTrait for &'static str {
+    fn object_safe(&self) {
+        unsafe {
+            puts(*self as *const str as *const u8);
+        }
+    }
+}
+
+struct NoisyDrop {
+    text: &'static str,
+    inner: NoisyDropInner,
+}
+
+struct NoisyDropUnsized {
+    inner: NoisyDropInner,
+    text: str,
+}
+
+struct NoisyDropInner;
+
+impl Drop for NoisyDrop {
+    fn drop(&mut self) {
+        unsafe {
+            puts(self.text as *const str as *const u8);
+        }
+    }
+}
+
+impl Drop for NoisyDropInner {
+    fn drop(&mut self) {
+        unsafe {
+            puts("Inner got dropped!\0" as *const str as *const u8);
+        }
+    }
+}
+
+impl SomeTrait for NoisyDrop {
+    fn object_safe(&self) {}
+}
+
+enum Ordering {
+    Less = -1,
+    Equal = 0,
+    Greater = 1,
+}
+
+#[lang = "start"]
+fn start<T: Termination + 'static>(
+    main: fn() -> T,
+    argc: isize,
+    argv: *const *const u8,
+) -> isize {
+    if argc == 3 {
+        unsafe { puts(*argv); }
+        unsafe { puts(*((argv as usize + intrinsics::size_of::<*const u8>()) as *const *const u8)); }
+        unsafe { puts(*((argv as usize + 2 * intrinsics::size_of::<*const u8>()) as *const *const u8)); }
+    }
+
+    main().report();
+    0
+}
+
+static mut NUM: u8 = 6 * 7;
+static NUM_REF: &'static u8 = unsafe { &NUM };
+
+macro_rules! assert {
+    ($e:expr) => {
+        if !$e {
+            panic(stringify!(! $e));
+        }
+    };
+}
+
+macro_rules! assert_eq {
+    ($l:expr, $r: expr) => {
+        if $l != $r {
+            panic(stringify!($l != $r));
+        }
+    }
+}
+
+struct Unique<T: ?Sized> {
+    pointer: *const T,
+    _marker: PhantomData<T>,
+}
+
+impl<T: ?Sized, U: ?Sized> CoerceUnsized<Unique<U>> for Unique<T> where T: Unsize<U> {}
+
+unsafe fn zeroed<T>() -> T {
+    let mut uninit = MaybeUninit { uninit: () };
+    intrinsics::write_bytes(&mut uninit.value.value as *mut T, 0, 1);
+    uninit.value.value
+}
+
+fn take_f32(_f: f32) {}
+fn take_unique(_u: Unique<()>) {}
+
+fn return_u128_pair() -> (u128, u128) {
+    (0, 0)
+}
+
+fn call_return_u128_pair() {
+    return_u128_pair();
+}
+
+fn main() {
+    take_unique(Unique {
+        pointer: 0 as *const (),
+        _marker: PhantomData,
+    });
+    take_f32(0.1);
+
+    //call_return_u128_pair();
+
+    let slice = &[0, 1] as &[i32];
+    let slice_ptr = slice as *const [i32] as *const i32;
+
+    assert_eq!(slice_ptr as usize % 4, 0);
+
+    //return;
+
+    unsafe {
+        printf("Hello %s\n\0" as *const str as *const i8, "printf\0" as *const str as *const i8);
+
+        let hello: &[u8] = b"Hello\0" as &[u8; 6];
+        let ptr: *const u8 = hello as *const [u8] as *const u8;
+        puts(ptr);
+
+        let world: Box<&str> = box "World!\0";
+        puts(*world as *const str as *const u8);
+        world as Box<dyn SomeTrait>;
+
+        assert_eq!(intrinsics::bitreverse(0b10101000u8), 0b00010101u8);
+
+        assert_eq!(intrinsics::bswap(0xabu8), 0xabu8);
+        assert_eq!(intrinsics::bswap(0xddccu16), 0xccddu16);
+        assert_eq!(intrinsics::bswap(0xffee_ddccu32), 0xccdd_eeffu32);
+        assert_eq!(intrinsics::bswap(0x1234_5678_ffee_ddccu64), 0xccdd_eeff_7856_3412u64);
+
+        assert_eq!(intrinsics::size_of_val(hello) as u8, 6);
+
+        let chars = &['C', 'h', 'a', 'r', 's'];
+        let chars = chars as &[char];
+        assert_eq!(intrinsics::size_of_val(chars) as u8, 4 * 5);
+
+        let a: &dyn SomeTrait = &"abc\0";
+        a.object_safe();
+
+        assert_eq!(intrinsics::size_of_val(a) as u8, 16);
+        assert_eq!(intrinsics::size_of_val(&0u32) as u8, 4);
+
+        assert_eq!(intrinsics::min_align_of::<u16>() as u8, 2);
+        assert_eq!(intrinsics::min_align_of_val(&a) as u8, intrinsics::min_align_of::<&str>() as u8);
+
+        assert!(!intrinsics::needs_drop::<u8>());
+        assert!(!intrinsics::needs_drop::<[u8]>());
+        assert!(intrinsics::needs_drop::<NoisyDrop>());
+        assert!(intrinsics::needs_drop::<NoisyDropUnsized>());
+
+        Unique {
+            pointer: 0 as *const &str,
+            _marker: PhantomData,
+        } as Unique<dyn SomeTrait>;
+
+        struct MyDst<T: ?Sized>(T);
+
+        intrinsics::size_of_val(&MyDst([0u8; 4]) as &MyDst<[u8]>);
+
+        struct Foo {
+            x: u8,
+            y: !,
+        }
+
+        unsafe fn uninitialized<T>() -> T {
+            MaybeUninit { uninit: () }.value.value
+        }
+
+        zeroed::<(u8, u8)>();
+        #[allow(unreachable_code)]
+        {
+            if false {
+                zeroed::<!>();
+                zeroed::<Foo>();
+                uninitialized::<Foo>();
+            }
+        }
+    }
+
+    let _ = box NoisyDrop {
+        text: "Boxed outer got dropped!\0",
+        inner: NoisyDropInner,
+    } as Box<dyn SomeTrait>;
+
+    const FUNC_REF: Option<fn()> = Some(main);
+    match FUNC_REF {
+        Some(_) => {},
+        None => assert!(false),
+    }
+
+    match Ordering::Less {
+        Ordering::Less => {},
+        _ => assert!(false),
+    }
+
+    [NoisyDropInner, NoisyDropInner];
+
+    let x = &[0u32, 42u32] as &[u32];
+    match x {
+        [] => assert_eq!(0u32, 1),
+        [_, ref y @ ..] => assert_eq!(&x[1] as *const u32 as usize, &y[0] as *const u32 as usize),
+    }
+
+    assert_eq!(((|()| 42u8) as fn(()) -> u8)(()), 42);
+
+    extern {
+        #[linkage = "weak"]
+        static ABC: *const u8;
+    }
+
+    {
+        extern {
+            #[linkage = "weak"]
+            static ABC: *const u8;
+        }
+    }
+
+    // TODO(antoyo): to make this work, support weak linkage.
+    //unsafe { assert_eq!(ABC as usize, 0); }
+
+    &mut (|| Some(0 as *const ())) as &mut dyn FnMut() -> Option<*const ()>;
+
+    let f = 1000.0;
+    assert_eq!(f as u8, 255);
+    let f2 = -1000.0;
+    assert_eq!(f2 as i8, -128);
+    assert_eq!(f2 as u8, 0);
+
+    static ANOTHER_STATIC: &u8 = &A_STATIC;
+    assert_eq!(*ANOTHER_STATIC, 42);
+
+    check_niche_behavior();
+
+    extern "C" {
+        type ExternType;
+    }
+
+    struct ExternTypeWrapper {
+        _a: ExternType,
+    }
+
+    let nullptr = 0 as *const ();
+    let extern_nullptr = nullptr as *const ExternTypeWrapper;
+    extern_nullptr as *const ();
+    let slice_ptr = &[] as *const [u8];
+    slice_ptr as *const u8;
+
+    #[cfg(not(jit))]
+    test_tls();
+}
+
+#[repr(C)]
+enum c_void {
+    _1,
+    _2,
+}
+
+type c_int = i32;
+type c_ulong = u64;
+
+type pthread_t = c_ulong;
+
+#[repr(C)]
+struct pthread_attr_t {
+    __size: [u64; 7],
+}
+
+#[link(name = "pthread")]
+extern "C" {
+    fn pthread_attr_init(attr: *mut pthread_attr_t) -> c_int;
+
+    fn pthread_create(
+        native: *mut pthread_t,
+        attr: *const pthread_attr_t,
+        f: extern "C" fn(_: *mut c_void) -> *mut c_void,
+        value: *mut c_void
+    ) -> c_int;
+
+    fn pthread_join(
+        native: pthread_t,
+        value: *mut *mut c_void
+    ) -> c_int;
+}
+
+#[thread_local]
+#[cfg(not(jit))]
+static mut TLS: u8 = 42;
+
+#[cfg(not(jit))]
+extern "C" fn mutate_tls(_: *mut c_void) -> *mut c_void {
+    unsafe { TLS = 0; }
+    0 as *mut c_void
+}
+
+#[cfg(not(jit))]
+fn test_tls() {
+    unsafe {
+        let mut attr: pthread_attr_t = zeroed();
+        let mut thread: pthread_t = 0;
+
+        assert_eq!(TLS, 42);
+
+        if pthread_attr_init(&mut attr) != 0 {
+            assert!(false);
+        }
+
+        if pthread_create(&mut thread, &attr, mutate_tls, 0 as *mut c_void) != 0 {
+            assert!(false);
+        }
+
+        let mut res = 0 as *mut c_void;
+        pthread_join(thread, &mut res);
+
+        // TLS of main thread must not have been changed by the other thread.
+        assert_eq!(TLS, 42);
+
+        puts("TLS works!\n\0" as *const str as *const u8);
+    }
+}
+
+// Copied ui/issues/issue-61696.rs
+
+pub enum Infallible {}
+
+// The check that the `bool` field of `V1` is encoding a "niche variant"
+// (i.e. not `V1`, so `V3` or `V4`) used to be mathematically incorrect,
+// causing valid `V1` values to be interpreted as other variants.
+pub enum E1 {
+    V1 { f: bool },
+    V2 { f: Infallible },
+    V3,
+    V4,
+}
+
+// Computing the discriminant used to be done using the niche type (here `u8`,
+// from the `bool` field of `V1`), overflowing for variants with large enough
+// indices (`V3` and `V4`), causing them to be interpreted as other variants.
+pub enum E2<X> {
+    V1 { f: bool },
+
+    /*_00*/ _01(X), _02(X), _03(X), _04(X), _05(X), _06(X), _07(X),
+    _08(X), _09(X), _0A(X), _0B(X), _0C(X), _0D(X), _0E(X), _0F(X),
+    _10(X), _11(X), _12(X), _13(X), _14(X), _15(X), _16(X), _17(X),
+    _18(X), _19(X), _1A(X), _1B(X), _1C(X), _1D(X), _1E(X), _1F(X),
+    _20(X), _21(X), _22(X), _23(X), _24(X), _25(X), _26(X), _27(X),
+    _28(X), _29(X), _2A(X), _2B(X), _2C(X), _2D(X), _2E(X), _2F(X),
+    _30(X), _31(X), _32(X), _33(X), _34(X), _35(X), _36(X), _37(X),
+    _38(X), _39(X), _3A(X), _3B(X), _3C(X), _3D(X), _3E(X), _3F(X),
+    _40(X), _41(X), _42(X), _43(X), _44(X), _45(X), _46(X), _47(X),
+    _48(X), _49(X), _4A(X), _4B(X), _4C(X), _4D(X), _4E(X), _4F(X),
+    _50(X), _51(X), _52(X), _53(X), _54(X), _55(X), _56(X), _57(X),
+    _58(X), _59(X), _5A(X), _5B(X), _5C(X), _5D(X), _5E(X), _5F(X),
+    _60(X), _61(X), _62(X), _63(X), _64(X), _65(X), _66(X), _67(X),
+    _68(X), _69(X), _6A(X), _6B(X), _6C(X), _6D(X), _6E(X), _6F(X),
+    _70(X), _71(X), _72(X), _73(X), _74(X), _75(X), _76(X), _77(X),
+    _78(X), _79(X), _7A(X), _7B(X), _7C(X), _7D(X), _7E(X), _7F(X),
+    _80(X), _81(X), _82(X), _83(X), _84(X), _85(X), _86(X), _87(X),
+    _88(X), _89(X), _8A(X), _8B(X), _8C(X), _8D(X), _8E(X), _8F(X),
+    _90(X), _91(X), _92(X), _93(X), _94(X), _95(X), _96(X), _97(X),
+    _98(X), _99(X), _9A(X), _9B(X), _9C(X), _9D(X), _9E(X), _9F(X),
+    _A0(X), _A1(X), _A2(X), _A3(X), _A4(X), _A5(X), _A6(X), _A7(X),
+    _A8(X), _A9(X), _AA(X), _AB(X), _AC(X), _AD(X), _AE(X), _AF(X),
+    _B0(X), _B1(X), _B2(X), _B3(X), _B4(X), _B5(X), _B6(X), _B7(X),
+    _B8(X), _B9(X), _BA(X), _BB(X), _BC(X), _BD(X), _BE(X), _BF(X),
+    _C0(X), _C1(X), _C2(X), _C3(X), _C4(X), _C5(X), _C6(X), _C7(X),
+    _C8(X), _C9(X), _CA(X), _CB(X), _CC(X), _CD(X), _CE(X), _CF(X),
+    _D0(X), _D1(X), _D2(X), _D3(X), _D4(X), _D5(X), _D6(X), _D7(X),
+    _D8(X), _D9(X), _DA(X), _DB(X), _DC(X), _DD(X), _DE(X), _DF(X),
+    _E0(X), _E1(X), _E2(X), _E3(X), _E4(X), _E5(X), _E6(X), _E7(X),
+    _E8(X), _E9(X), _EA(X), _EB(X), _EC(X), _ED(X), _EE(X), _EF(X),
+    _F0(X), _F1(X), _F2(X), _F3(X), _F4(X), _F5(X), _F6(X), _F7(X),
+    _F8(X), _F9(X), _FA(X), _FB(X), _FC(X), _FD(X), _FE(X), _FF(X),
+
+    V3,
+    V4,
+}
+
+fn check_niche_behavior () {
+    if let E1::V2 { .. } = (E1::V1 { f: true }) {
+        intrinsics::abort();
+    }
+
+    if let E2::V1 { .. } = E2::V3::<Infallible> {
+        intrinsics::abort();
+    }
+}