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|
// Compiler:
//
// Run-time:
// status: 0
// stdout: 5
#![feature(arbitrary_self_types, auto_traits, lang_items, no_core, start, intrinsics)]
#![no_std]
#![no_core]
/*
* Core
*/
// Because we don't have core yet.
#[lang = "sized"]
pub trait Sized {}
#[lang = "copy"]
trait Copy {
}
impl Copy for isize {}
impl Copy for usize {}
impl Copy for i32 {}
impl Copy for u32 {}
#[lang = "receiver"]
trait Receiver {
}
#[lang = "freeze"]
pub(crate) unsafe auto trait Freeze {}
mod libc {
#[link(name = "c")]
extern "C" {
pub fn printf(format: *const i8, ...) -> i32;
}
}
#[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]
}
}
impl<T> Index<usize> for [T] {
type Output = T;
fn index(&self, index: usize) -> &Self::Output {
&self[index]
}
}
#[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 {}
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
#[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 = "panic_location"]
struct PanicLocation {
file: &'static str,
line: u32,
column: u32,
}
#[lang = "panic_bounds_check"]
#[track_caller]
#[no_mangle]
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();
}
}
mod intrinsics {
use super::Sized;
extern "rust-intrinsic" {
pub fn abort() -> !;
}
}
/*
* Code
*/
static mut TWO: usize = 2;
fn index_slice(s: &[u32]) -> u32 {
unsafe {
s[TWO]
}
}
#[start]
fn main(mut argc: isize, _argv: *const *const u8) -> isize {
let array = [42, 7, 5];
unsafe {
libc::printf(b"%ld\n\0" as *const u8 as *const i8, index_slice(&array));
}
0
}
|
