mirror of
https://github.com/rust-lang/rust.git
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130 lines
2.5 KiB
Rust
130 lines
2.5 KiB
Rust
// Compiler:
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//
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// Run-time:
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// status: 0
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// stdout: 5
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#![feature(arbitrary_self_types, auto_traits, lang_items, no_core, start, intrinsics)]
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#![no_std]
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#![no_core]
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/*
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* Core
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*/
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// Because we don't have core yet.
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#[lang = "sized"]
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pub trait Sized {}
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#[lang = "copy"]
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trait Copy {
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}
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impl Copy for isize {}
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impl Copy for usize {}
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impl Copy for i32 {}
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impl Copy for u32 {}
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#[lang = "receiver"]
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trait Receiver {
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}
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#[lang = "freeze"]
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pub(crate) unsafe auto trait Freeze {}
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mod libc {
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#[link(name = "c")]
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extern "C" {
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pub fn printf(format: *const i8, ...) -> i32;
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}
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}
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#[lang = "index"]
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pub trait Index<Idx: ?Sized> {
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type Output: ?Sized;
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fn index(&self, index: Idx) -> &Self::Output;
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}
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impl<T> Index<usize> for [T; 3] {
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type Output = T;
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fn index(&self, index: usize) -> &Self::Output {
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&self[index]
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}
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}
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impl<T> Index<usize> for [T] {
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type Output = T;
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fn index(&self, index: usize) -> &Self::Output {
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&self[index]
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}
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}
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#[lang = "unsize"]
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pub trait Unsize<T: ?Sized> {}
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#[lang = "coerce_unsized"]
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pub trait CoerceUnsized<T> {}
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impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
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impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a mut U> for &'a mut T {}
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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 {}
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#[lang = "drop_in_place"]
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#[allow(unconditional_recursion)]
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pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
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// Code here does not matter - this is replaced by the
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// real drop glue by the compiler.
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drop_in_place(to_drop);
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}
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#[lang = "panic_location"]
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struct PanicLocation {
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file: &'static str,
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line: u32,
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column: u32,
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}
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#[lang = "panic_bounds_check"]
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#[track_caller]
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#[no_mangle]
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fn panic_bounds_check(index: usize, len: usize) -> ! {
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unsafe {
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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);
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intrinsics::abort();
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}
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}
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mod intrinsics {
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use super::Sized;
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extern "rust-intrinsic" {
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#[rustc_safe_intrinsic]
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pub fn abort() -> !;
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}
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}
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/*
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* Code
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*/
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static mut TWO: usize = 2;
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fn index_slice(s: &[u32]) -> u32 {
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unsafe {
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s[TWO]
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}
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}
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#[start]
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fn main(mut argc: isize, _argv: *const *const u8) -> isize {
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let array = [42, 7, 5];
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unsafe {
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libc::printf(b"%ld\n\0" as *const u8 as *const i8, index_slice(&array));
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}
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0
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}
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