rust/example/mini_core.rs

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#![feature(
no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types,
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untagged_unions, decl_macro, rustc_attrs, transparent_unions, optin_builtin_traits,
thread_local,
)]
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#![no_core]
#![allow(dead_code)]
#[lang = "sized"]
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pub trait Sized {}
#[lang = "unsize"]
pub trait Unsize<T: ?Sized> {}
#[lang = "coerce_unsized"]
pub trait CoerceUnsized<T> {}
impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a mut U> for &'a mut T {}
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for *const T {}
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impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
#[lang = "dispatch_from_dyn"]
pub trait DispatchFromDyn<T> {}
// &T -> &U
impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a U> for &'a T {}
// &mut T -> &mut U
impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a mut U> for &'a mut T {}
// *const T -> *const U
impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*const U> for *const T {}
// *mut T -> *mut U
impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*mut U> for *mut T {}
impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Box<U>> for Box<T> {}
#[lang = "receiver"]
pub trait Receiver {}
impl<T: ?Sized> Receiver for &T {}
impl<T: ?Sized> Receiver for &mut T {}
impl<T: ?Sized> Receiver for Box<T> {}
#[lang = "copy"]
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pub unsafe trait Copy {}
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unsafe impl Copy for bool {}
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unsafe impl Copy for u8 {}
unsafe impl Copy for u16 {}
unsafe impl Copy for u32 {}
unsafe impl Copy for u64 {}
unsafe impl Copy for u128 {}
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unsafe impl Copy for usize {}
unsafe impl Copy for i8 {}
unsafe impl Copy for i16 {}
unsafe impl Copy for i32 {}
unsafe impl Copy for isize {}
unsafe impl Copy for f32 {}
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unsafe impl Copy for char {}
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unsafe impl<'a, T: ?Sized> Copy for &'a T {}
unsafe impl<T: ?Sized> Copy for *const T {}
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unsafe impl<T: ?Sized> Copy for *mut T {}
unsafe impl<T: Copy> Copy for Option<T> {}
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#[lang = "sync"]
pub unsafe trait Sync {}
unsafe impl Sync for bool {}
unsafe impl Sync for u8 {}
unsafe impl Sync for u16 {}
unsafe impl Sync for u32 {}
unsafe impl Sync for u64 {}
unsafe impl Sync for usize {}
unsafe impl Sync for i8 {}
unsafe impl Sync for i16 {}
unsafe impl Sync for i32 {}
unsafe impl Sync for isize {}
unsafe impl Sync for char {}
unsafe impl<'a, T: ?Sized> Sync for &'a T {}
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unsafe impl Sync for [u8; 16] {}
#[lang = "freeze"]
unsafe auto trait Freeze {}
unsafe impl<T: ?Sized> Freeze for PhantomData<T> {}
unsafe impl<T: ?Sized> Freeze for *const T {}
unsafe impl<T: ?Sized> Freeze for *mut T {}
unsafe impl<T: ?Sized> Freeze for &T {}
unsafe impl<T: ?Sized> Freeze for &mut T {}
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#[lang = "structural_peq"]
pub trait StructuralPartialEq {}
#[lang = "structural_teq"]
pub trait StructuralEq {}
#[lang = "not"]
pub trait Not {
type Output;
fn not(self) -> Self::Output;
}
impl Not for bool {
type Output = bool;
fn not(self) -> bool {
!self
}
}
#[lang = "mul"]
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pub trait Mul<RHS = Self> {
type Output;
#[must_use]
fn mul(self, rhs: RHS) -> Self::Output;
}
impl Mul for u8 {
type Output = Self;
fn mul(self, rhs: Self) -> Self::Output {
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self * rhs
}
}
impl Mul for usize {
type Output = Self;
fn mul(self, rhs: Self) -> Self::Output {
self * rhs
}
}
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#[lang = "add"]
pub trait Add<RHS = Self> {
type Output;
fn add(self, rhs: RHS) -> Self::Output;
}
impl Add for u8 {
type Output = Self;
fn add(self, rhs: Self) -> Self {
self + rhs
}
}
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impl Add for i8 {
type Output = Self;
fn add(self, rhs: Self) -> Self {
self + rhs
}
}
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impl Add for usize {
type Output = Self;
fn add(self, rhs: Self) -> Self {
self + rhs
}
}
#[lang = "sub"]
pub trait Sub<RHS = Self> {
type Output;
fn sub(self, rhs: RHS) -> Self::Output;
}
impl Sub for usize {
type Output = Self;
fn sub(self, rhs: Self) -> Self {
self - rhs
}
}
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impl Sub for u8 {
type Output = Self;
fn sub(self, rhs: Self) -> Self {
self - rhs
}
}
impl Sub for i8 {
type Output = Self;
fn sub(self, rhs: Self) -> Self {
self - rhs
}
}
impl Sub for i16 {
type Output = Self;
fn sub(self, rhs: Self) -> Self {
self - rhs
}
}
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#[lang = "rem"]
pub trait Rem<RHS = Self> {
type Output;
fn rem(self, rhs: RHS) -> Self::Output;
}
impl Rem for usize {
type Output = Self;
fn rem(self, rhs: Self) -> Self {
self % rhs
}
}
#[lang = "bitor"]
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pub trait BitOr<RHS = Self> {
type Output;
#[must_use]
fn bitor(self, rhs: RHS) -> Self::Output;
}
impl BitOr for bool {
type Output = bool;
fn bitor(self, rhs: bool) -> bool {
self | rhs
}
}
impl<'a> BitOr<bool> for &'a bool {
type Output = bool;
fn bitor(self, rhs: bool) -> bool {
*self | rhs
}
}
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#[lang = "eq"]
pub trait PartialEq<Rhs: ?Sized = Self> {
fn eq(&self, other: &Rhs) -> bool;
fn ne(&self, other: &Rhs) -> bool;
}
impl PartialEq for u8 {
fn eq(&self, other: &u8) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &u8) -> bool {
(*self) != (*other)
}
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}
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impl PartialEq for u16 {
fn eq(&self, other: &u16) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &u16) -> bool {
(*self) != (*other)
}
}
impl PartialEq for u32 {
fn eq(&self, other: &u32) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &u32) -> bool {
(*self) != (*other)
}
}
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impl PartialEq for u64 {
fn eq(&self, other: &u64) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &u64) -> bool {
(*self) != (*other)
}
}
impl PartialEq for u128 {
fn eq(&self, other: &u128) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &u128) -> bool {
(*self) != (*other)
}
}
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impl PartialEq for usize {
fn eq(&self, other: &usize) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &usize) -> bool {
(*self) != (*other)
}
}
impl PartialEq for i8 {
fn eq(&self, other: &i8) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &i8) -> bool {
(*self) != (*other)
}
}
impl PartialEq for i32 {
fn eq(&self, other: &i32) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &i32) -> bool {
(*self) != (*other)
}
}
impl PartialEq for isize {
fn eq(&self, other: &isize) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &isize) -> bool {
(*self) != (*other)
}
}
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impl PartialEq for char {
fn eq(&self, other: &char) -> bool {
(*self) == (*other)
}
fn ne(&self, other: &char) -> bool {
(*self) != (*other)
}
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}
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impl<T: ?Sized> PartialEq for *const T {
fn eq(&self, other: &*const T) -> bool {
*self == *other
}
fn ne(&self, other: &*const T) -> bool {
*self != *other
}
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}
impl <T: PartialEq> PartialEq for Option<T> {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Some(lhs), Some(rhs)) => *lhs == *rhs,
(None, None) => true,
_ => false,
}
}
fn ne(&self, other: &Self) -> bool {
match (self, other) {
(Some(lhs), Some(rhs)) => *lhs != *rhs,
(None, None) => false,
_ => true,
}
}
}
#[lang = "neg"]
pub trait Neg {
type Output;
fn neg(self) -> Self::Output;
}
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impl Neg for i8 {
type Output = i8;
fn neg(self) -> i8 {
-self
}
}
impl Neg for i16 {
type Output = i16;
fn neg(self) -> i16 {
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self
}
}
impl Neg for isize {
type Output = isize;
fn neg(self) -> isize {
-self
}
}
impl Neg for f32 {
type Output = f32;
fn neg(self) -> f32 {
-self
}
}
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pub enum Option<T> {
Some(T),
None,
}
pub use Option::*;
#[lang = "phantom_data"]
pub struct PhantomData<T: ?Sized>;
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#[lang = "fn_once"]
#[rustc_paren_sugar]
pub trait FnOnce<Args> {
#[lang = "fn_once_output"]
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type Output;
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
}
#[lang = "fn_mut"]
#[rustc_paren_sugar]
pub trait FnMut<Args>: FnOnce<Args> {
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extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output;
}
#[lang = "panic"]
#[track_caller]
pub fn panic(_msg: &str) -> ! {
unsafe {
libc::puts("Panicking\n\0" as *const str as *const i8);
intrinsics::abort();
}
}
#[lang = "panic_bounds_check"]
#[track_caller]
fn panic_bounds_check(index: usize, len: usize) -> ! {
unsafe {
libc::printf("index out of bounds: the len is %d but the index is %d\n\0" as *const str as *const i8, len, index);
intrinsics::abort();
}
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}
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#[lang = "eh_personality"]
fn eh_personality() -> ! {
loop {}
}
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#[lang = "drop_in_place"]
#[allow(unconditional_recursion)]
pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
// Code here does not matter - this is replaced by the
// real drop glue by the compiler.
drop_in_place(to_drop);
}
#[lang = "deref"]
pub trait Deref {
type Target: ?Sized;
fn deref(&self) -> &Self::Target;
}
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#[lang = "owned_box"]
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pub struct Box<T: ?Sized>(*mut T);
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Box<U>> for Box<T> {}
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impl<T: ?Sized> Drop for Box<T> {
fn drop(&mut self) {
// drop is currently performed by compiler.
}
}
impl<T> Deref for Box<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&**self
}
}
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#[lang = "exchange_malloc"]
unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
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libc::malloc(size)
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}
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#[lang = "box_free"]
unsafe fn box_free<T: ?Sized>(ptr: *mut T) {
libc::free(ptr as *mut u8);
}
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#[lang = "drop"]
pub trait Drop {
fn drop(&mut self);
}
#[lang = "manually_drop"]
#[repr(transparent)]
pub struct ManuallyDrop<T: ?Sized> {
pub value: T,
}
#[lang = "maybe_uninit"]
#[repr(transparent)]
pub union MaybeUninit<T> {
pub uninit: (),
pub value: ManuallyDrop<T>,
}
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pub mod intrinsics {
extern "rust-intrinsic" {
pub fn abort() -> !;
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pub fn size_of<T>() -> usize;
pub fn size_of_val<T: ?::Sized>(val: *const T) -> usize;
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pub fn min_align_of<T>() -> usize;
pub fn min_align_of_val<T: ?::Sized>(val: *const T) -> usize;
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pub fn copy<T>(src: *const T, dst: *mut T, count: usize);
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pub fn transmute<T, U>(e: T) -> U;
pub fn ctlz_nonzero<T>(x: T) -> T;
pub fn needs_drop<T>() -> bool;
pub fn bitreverse<T>(x: T) -> T;
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pub fn bswap<T>(x: T) -> T;
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pub fn write_bytes<T>(dst: *mut T, val: u8, count: usize);
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}
}
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pub mod libc {
#[cfg_attr(not(windows), link(name = "c"))]
#[cfg_attr(windows, link(name = "msvcrt"))]
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extern "C" {
pub fn puts(s: *const i8) -> i32;
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pub fn printf(format: *const i8, ...) -> i32;
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pub fn malloc(size: usize) -> *mut u8;
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pub fn free(ptr: *mut u8);
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pub fn memcpy(dst: *mut u8, src: *const u8, size: usize);
pub fn memmove(dst: *mut u8, src: *const u8, size: usize);
pub fn strncpy(dst: *mut u8, src: *const u8, size: usize);
}
}
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#[lang = "index"]
pub trait Index<Idx: ?Sized> {
type Output: ?Sized;
fn index(&self, index: Idx) -> &Self::Output;
}
impl<T> Index<usize> for [T; 3] {
type Output = T;
fn index(&self, index: usize) -> &Self::Output {
&self[index]
}
}
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impl<T> Index<usize> for [T] {
type Output = T;
fn index(&self, index: usize) -> &Self::Output {
&self[index]
}
}
extern {
type VaListImpl;
}
#[lang = "va_list"]
#[repr(transparent)]
pub struct VaList<'a>(&'a mut VaListImpl);
#[rustc_builtin_macro]
#[rustc_macro_transparency = "semitransparent"]
pub macro stringify($($t:tt)*) { /* compiler built-in */ }
#[rustc_builtin_macro]
#[rustc_macro_transparency = "semitransparent"]
pub macro file() { /* compiler built-in */ }
#[rustc_builtin_macro]
#[rustc_macro_transparency = "semitransparent"]
pub macro line() { /* compiler built-in */ }
#[rustc_builtin_macro]
#[rustc_macro_transparency = "semitransparent"]
pub macro cfg() { /* compiler built-in */ }
#[rustc_builtin_macro]
#[rustc_macro_transparency = "semitransparent"]
pub macro global_asm() { /* compiler built-in */ }
pub static A_STATIC: u8 = 42;
#[lang = "panic_location"]
struct PanicLocation {
file: &'static str,
line: u32,
column: u32,
}
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#[no_mangle]
pub fn get_tls() -> u8 {
#[thread_local]
static A: u8 = 42;
A
}