173 lines
2.8 KiB
Rust
173 lines
2.8 KiB
Rust
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// Compiler:
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//
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// Run-time:
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// stdout: 2
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// 7
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// 6
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// 11
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#![allow(internal_features, unused_attributes)]
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#![feature(auto_traits, lang_items, no_core, start, intrinsics, rustc_attrs, track_caller)]
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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 *mut i32 {}
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impl Copy for usize {}
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impl Copy for u8 {}
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impl Copy for i8 {}
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impl Copy for i32 {}
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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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#[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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mod libc {
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#[link(name = "c")]
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extern "C" {
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pub fn puts(s: *const u8) -> i32;
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pub fn fflush(stream: *mut i32) -> i32;
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pub fn printf(format: *const i8, ...) -> i32;
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pub static stdout: *mut i32;
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}
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}
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mod intrinsics {
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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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#[lang = "panic"]
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#[track_caller]
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#[no_mangle]
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pub fn panic(_msg: &'static str) -> ! {
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unsafe {
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libc::puts("Panicking\0" as *const str as *const u8);
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libc::fflush(libc::stdout);
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intrinsics::abort();
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}
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}
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#[lang = "add"]
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trait Add<RHS = Self> {
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type Output;
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fn add(self, rhs: RHS) -> Self::Output;
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}
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impl Add for u8 {
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type Output = Self;
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fn add(self, rhs: Self) -> Self {
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self + rhs
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}
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}
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impl Add for i8 {
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type Output = Self;
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fn add(self, rhs: Self) -> Self {
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self + rhs
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}
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}
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impl Add for i32 {
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type Output = Self;
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fn add(self, rhs: Self) -> Self {
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self + rhs
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}
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}
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impl Add for usize {
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type Output = Self;
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fn add(self, rhs: Self) -> Self {
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self + rhs
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}
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}
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impl Add for isize {
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type Output = Self;
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fn add(self, rhs: Self) -> Self {
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self + rhs
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}
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}
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#[track_caller]
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#[lang = "panic_const_add_overflow"]
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pub fn panic_const_add_overflow() -> ! {
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panic("attempt to add with overflow");
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}
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/*
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* Code
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*/
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struct Test {
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field: isize,
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}
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fn test(num: isize) -> Test {
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Test {
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field: num + 1,
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}
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}
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fn update_num(num: &mut isize) {
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*num = *num + 5;
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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 mut test = test(argc);
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unsafe {
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libc::printf(b"%ld\n\0" as *const u8 as *const i8, test.field);
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}
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update_num(&mut test.field);
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unsafe {
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libc::printf(b"%ld\n\0" as *const u8 as *const i8, test.field);
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}
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update_num(&mut argc);
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unsafe {
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libc::printf(b"%ld\n\0" as *const u8 as *const i8, argc);
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}
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let refe = &mut argc;
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*refe = *refe + 5;
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unsafe {
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libc::printf(b"%ld\n\0" as *const u8 as *const i8, argc);
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}
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0
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}
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