rust/example/mini_core_hello_world.rs

830 lines
16 KiB
Rust

#![feature(no_core, lang_items, never_type, linkage, extern_types, thread_local, repr_simd)]
#![no_core]
#![allow(dead_code, non_camel_case_types, internal_features)]
extern crate mini_core;
use mini_core::libc::*;
use mini_core::*;
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));
}
};
}
#[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
assert_eq!(*NUM_REF as i32, 44);
}
0
}
}
trait SomeTrait {
fn object_safe(&self);
}
impl SomeTrait for &'static str {
fn object_safe(&self) {
unsafe {
puts(*self as *const str as *const i8);
}
}
}
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 i8);
}
}
}
impl Drop for NoisyDropInner {
fn drop(&mut self) {
unsafe {
puts("Inner got dropped!\0" as *const str as *const i8);
}
}
}
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,
_sigpipe: u8,
) -> isize {
if argc == 3 {
unsafe {
puts(*argv as *const i8);
}
unsafe {
puts(*((argv as usize + intrinsics::size_of::<*const u8>()) as *const *const i8));
}
unsafe {
puts(*((argv as usize + 2 * intrinsics::size_of::<*const u8>()) as *const *const i8));
}
}
main().report() as isize
}
static mut NUM: u8 = 6 * 7;
static NUM_REF: &'static u8 = unsafe { &NUM };
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();
}
#[repr(C)]
pub struct bool_11 {
field0: bool,
field1: bool,
field2: bool,
field3: bool,
field4: bool,
field5: bool,
field6: bool,
field7: bool,
field8: bool,
field9: bool,
field10: bool,
}
extern "C" fn bool_struct_in_11(_arg0: bool_11) {}
#[allow(unreachable_code)] // FIXME false positive
fn main() {
take_unique(Unique { pointer: unsafe { NonNull(1 as *mut ()) }, _marker: PhantomData });
take_f32(0.1);
call_return_u128_pair();
bool_struct_in_11(bool_11 {
field0: true,
field1: true,
field2: true,
field3: true,
field4: true,
field5: true,
field6: true,
field7: true,
field8: true,
field9: true,
field10: true,
});
let slice = &[0, 1] as &[i32];
let slice_ptr = slice as *const [i32] as *const i32;
assert_eq!(slice_ptr as usize % 4, 0);
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 i8 = hello as *const [u8] as *const i8;
puts(ptr);
let world: Box<&str> = Box::new("World!\0");
puts(*world as *const str as *const i8);
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: NonNull(1 as *mut &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::new(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);
#[cfg(not(any(jit, windows)))]
{
extern "C" {
#[linkage = "extern_weak"]
static ABC: *const u8;
}
{
extern "C" {
#[linkage = "extern_weak"]
static ABC: *const u8;
}
}
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);
let amount = 0;
assert_eq!(1u128 << amount, 1);
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;
let repeat = [Some(42); 2];
assert_eq!(repeat[0], Some(42));
assert_eq!(repeat[1], Some(42));
from_decimal_string();
#[cfg(all(not(jit), not(all(windows, target_env = "gnu"))))]
test_tls();
#[cfg(all(
not(jit),
not(no_unstable_features),
target_arch = "x86_64",
any(target_os = "linux", target_os = "macos")
))]
unsafe {
global_asm_test();
}
// Both statics have a reference that points to the same anonymous allocation.
static REF1: &u8 = &42;
static REF2: &u8 = REF1;
assert_eq!(*REF1, *REF2);
#[repr(simd)]
struct V([f64; 2]);
let f = V([0.0, 1.0]);
let _a = f.0[0];
stack_val_align();
}
#[inline(never)]
fn stack_val_align() {
#[repr(align(8192))]
struct Foo(u8);
let a = Foo(0);
assert_eq!(&a as *const Foo as usize % 8192, 0);
}
#[cfg(all(
not(jit),
not(no_unstable_features),
target_arch = "x86_64",
any(target_os = "linux", target_os = "macos")
))]
extern "C" {
fn global_asm_test();
}
#[cfg(all(not(jit), not(no_unstable_features), target_arch = "x86_64", target_os = "linux"))]
global_asm! {
"
.global global_asm_test
global_asm_test:
// comment that would normally be removed by LLVM
ret
"
}
#[cfg(all(not(jit), not(no_unstable_features), target_arch = "x86_64", target_os = "macos"))]
global_asm! {
"
.global _global_asm_test
_global_asm_test:
// comment that would normally be removed by LLVM
ret
"
}
#[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")]
#[cfg(unix)]
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;
}
type DWORD = u32;
type LPDWORD = *mut u32;
type LPVOID = *mut c_void;
type HANDLE = *mut c_void;
#[link(name = "msvcrt")]
#[cfg(windows)]
extern "C" {
fn WaitForSingleObject(hHandle: LPVOID, dwMilliseconds: DWORD) -> DWORD;
fn CreateThread(
lpThreadAttributes: LPVOID, // Technically LPSECURITY_ATTRIBUTES, but we don't use it anyway
dwStackSize: usize,
lpStartAddress: extern "C" fn(_: *mut c_void) -> *mut c_void,
lpParameter: LPVOID,
dwCreationFlags: DWORD,
lpThreadId: LPDWORD,
) -> HANDLE;
}
struct Thread {
#[cfg(windows)]
handle: HANDLE,
#[cfg(unix)]
handle: pthread_t,
}
impl Thread {
unsafe fn create(f: extern "C" fn(_: *mut c_void) -> *mut c_void) -> Self {
#[cfg(unix)]
{
let mut attr: pthread_attr_t = zeroed();
let mut thread: pthread_t = 0;
if pthread_attr_init(&mut attr) != 0 {
assert!(false);
}
if pthread_create(&mut thread, &attr, f, 0 as *mut c_void) != 0 {
assert!(false);
}
Thread { handle: thread }
}
#[cfg(windows)]
{
let handle = CreateThread(0 as *mut c_void, 0, f, 0 as *mut c_void, 0, 0 as *mut u32);
if (handle as u64) == 0 {
assert!(false);
}
Thread { handle }
}
}
unsafe fn join(self) {
#[cfg(unix)]
{
let mut res = 0 as *mut c_void;
pthread_join(self.handle, &mut res);
}
#[cfg(windows)]
{
// The INFINITE macro is used to signal operations that do not timeout.
let infinite = 0xffffffff;
assert!(WaitForSingleObject(self.handle, infinite) == 0);
}
}
}
#[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 {
assert_eq!(TLS, 42);
let thread = Thread::create(mutate_tls);
thread.join();
// 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 i8);
}
}
// 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.
#[rustfmt::skip]
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();
}
}
fn from_decimal_string() {
loop {
let multiplier = 1;
take_multiplier_ref(&multiplier);
if multiplier == 1 {
break;
}
unreachable();
}
}
fn take_multiplier_ref(_multiplier: &u128) {}
fn unreachable() -> ! {
panic("unreachable")
}