compiler/rustc_codegen_gcc/example/mini_core.rs

   1 #![feature(
   2     no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types,
   3     untagged_unions, decl_macro, rustc_attrs, transparent_unions, auto_traits,
   4     thread_local
   5 )]
   6 #![no_core]
   7 #![allow(dead_code)]
   8
   9 #[no_mangle]
  10 unsafe extern "C" fn _Unwind_Resume() {
  11     intrinsics::unreachable();
  12 }
  13
  14 #[lang = "sized"]
  15 pub trait Sized {}
  16
  17 #[lang = "destruct"]
  18 pub trait Destruct {}
  19
  20 #[lang = "unsize"]
  21 pub trait Unsize<T: ?Sized> {}
  22
  23 #[lang = "coerce_unsized"]
  24 pub trait CoerceUnsized<T> {}
  25
  26 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
  27 impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a mut U> for &'a mut T {}
  28 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*const U> for *const T {}
  29 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
  30
  31 #[lang = "dispatch_from_dyn"]
  32 pub trait DispatchFromDyn<T> {}
  33
  34 // &T -> &U
  35 impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a U> for &'a T {}
  36 // &mut T -> &mut U
  37 impl<'a, T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<&'a mut U> for &'a mut T {}
  38 // *const T -> *const U
  39 impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*const U> for *const T {}
  40 // *mut T -> *mut U
  41 impl<T: ?Sized+Unsize<U>, U: ?Sized> DispatchFromDyn<*mut U> for *mut T {}
  42 impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Box<U>> for Box<T> {}
  43
  44 #[lang = "receiver"]
  45 pub trait Receiver {}
  46
  47 impl<T: ?Sized> Receiver for &T {}
  48 impl<T: ?Sized> Receiver for &mut T {}
  49 impl<T: ?Sized> Receiver for Box<T> {}
  50
  51 #[lang = "copy"]
  52 pub unsafe trait Copy {}
  53
  54 unsafe impl Copy for bool {}
  55 unsafe impl Copy for u8 {}
  56 unsafe impl Copy for u16 {}
  57 unsafe impl Copy for u32 {}
  58 unsafe impl Copy for u64 {}
  59 unsafe impl Copy for usize {}
  60 unsafe impl Copy for i8 {}
  61 unsafe impl Copy for i16 {}
  62 unsafe impl Copy for i32 {}
  63 unsafe impl Copy for isize {}
  64 unsafe impl Copy for f32 {}
  65 unsafe impl Copy for f64 {}
  66 unsafe impl Copy for char {}
  67 unsafe impl<'a, T: ?Sized> Copy for &'a T {}
  68 unsafe impl<T: ?Sized> Copy for *const T {}
  69 unsafe impl<T: ?Sized> Copy for *mut T {}
  70
  71 #[lang = "sync"]
  72 pub unsafe trait Sync {}
  73
  74 unsafe impl Sync for bool {}
  75 unsafe impl Sync for u8 {}
  76 unsafe impl Sync for u16 {}
  77 unsafe impl Sync for u32 {}
  78 unsafe impl Sync for u64 {}
  79 unsafe impl Sync for usize {}
  80 unsafe impl Sync for i8 {}
  81 unsafe impl Sync for i16 {}
  82 unsafe impl Sync for i32 {}
  83 unsafe impl Sync for isize {}
  84 unsafe impl Sync for char {}
  85 unsafe impl<'a, T: ?Sized> Sync for &'a T {}
  86 unsafe impl Sync for [u8; 16] {}
  87
  88 #[lang = "freeze"]
  89 unsafe auto trait Freeze {}
  90
  91 unsafe impl<T: ?Sized> Freeze for PhantomData<T> {}
  92 unsafe impl<T: ?Sized> Freeze for *const T {}
  93 unsafe impl<T: ?Sized> Freeze for *mut T {}
  94 unsafe impl<T: ?Sized> Freeze for &T {}
  95 unsafe impl<T: ?Sized> Freeze for &mut T {}
  96
  97 #[lang = "structural_peq"]
  98 pub trait StructuralPartialEq {}
  99
 100 #[lang = "structural_teq"]
 101 pub trait StructuralEq {}
 102
 103 #[lang = "not"]
 104 pub trait Not {
 105     type Output;
 106
 107     fn not(self) -> Self::Output;
 108 }
 109
 110 impl Not for bool {
 111     type Output = bool;
 112
 113     fn not(self) -> bool {
 114         !self
 115     }
 116 }
 117
 118 #[lang = "mul"]
 119 pub trait Mul<RHS = Self> {
 120     type Output;
 121
 122     #[must_use]
 123     fn mul(self, rhs: RHS) -> Self::Output;
 124 }
 125
 126 impl Mul for u8 {
 127     type Output = Self;
 128
 129     fn mul(self, rhs: Self) -> Self::Output {
 130         self * rhs
 131     }
 132 }
 133
 134 impl Mul for usize {
 135     type Output = Self;
 136
 137     fn mul(self, rhs: Self) -> Self::Output {
 138         self * rhs
 139     }
 140 }
 141
 142 #[lang = "add"]
 143 pub trait Add<RHS = Self> {
 144     type Output;
 145
 146     fn add(self, rhs: RHS) -> Self::Output;
 147 }
 148
 149 impl Add for u8 {
 150     type Output = Self;
 151
 152     fn add(self, rhs: Self) -> Self {
 153         self + rhs
 154     }
 155 }
 156
 157 impl Add for i8 {
 158     type Output = Self;
 159
 160     fn add(self, rhs: Self) -> Self {
 161         self + rhs
 162     }
 163 }
 164
 165 impl Add for usize {
 166     type Output = Self;
 167
 168     fn add(self, rhs: Self) -> Self {
 169         self + rhs
 170     }
 171 }
 172
 173 #[lang = "sub"]
 174 pub trait Sub<RHS = Self> {
 175     type Output;
 176
 177     fn sub(self, rhs: RHS) -> Self::Output;
 178 }
 179
 180 impl Sub for usize {
 181     type Output = Self;
 182
 183     fn sub(self, rhs: Self) -> Self {
 184         self - rhs
 185     }
 186 }
 187
 188 impl Sub for u8 {
 189     type Output = Self;
 190
 191     fn sub(self, rhs: Self) -> Self {
 192         self - rhs
 193     }
 194 }
 195
 196 impl Sub for i8 {
 197     type Output = Self;
 198
 199     fn sub(self, rhs: Self) -> Self {
 200         self - rhs
 201     }
 202 }
 203
 204 impl Sub for i16 {
 205     type Output = Self;
 206
 207     fn sub(self, rhs: Self) -> Self {
 208         self - rhs
 209     }
 210 }
 211
 212 #[lang = "rem"]
 213 pub trait Rem<RHS = Self> {
 214     type Output;
 215
 216     fn rem(self, rhs: RHS) -> Self::Output;
 217 }
 218
 219 impl Rem for usize {
 220     type Output = Self;
 221
 222     fn rem(self, rhs: Self) -> Self {
 223         self % rhs
 224     }
 225 }
 226
 227 #[lang = "bitor"]
 228 pub trait BitOr<RHS = Self> {
 229     type Output;
 230
 231     #[must_use]
 232     fn bitor(self, rhs: RHS) -> Self::Output;
 233 }
 234
 235 impl BitOr for bool {
 236     type Output = bool;
 237
 238     fn bitor(self, rhs: bool) -> bool {
 239         self | rhs
 240     }
 241 }
 242
 243 impl<'a> BitOr<bool> for &'a bool {
 244     type Output = bool;
 245
 246     fn bitor(self, rhs: bool) -> bool {
 247         *self | rhs
 248     }
 249 }
 250
 251 #[lang = "eq"]
 252 pub trait PartialEq<Rhs: ?Sized = Self> {
 253     fn eq(&self, other: &Rhs) -> bool;
 254     fn ne(&self, other: &Rhs) -> bool;
 255 }
 256
 257 impl PartialEq for u8 {
 258     fn eq(&self, other: &u8) -> bool {
 259         (*self) == (*other)
 260     }
 261     fn ne(&self, other: &u8) -> bool {
 262         (*self) != (*other)
 263     }
 264 }
 265
 266 impl PartialEq for u16 {
 267     fn eq(&self, other: &u16) -> bool {
 268         (*self) == (*other)
 269     }
 270     fn ne(&self, other: &u16) -> bool {
 271         (*self) != (*other)
 272     }
 273 }
 274
 275 impl PartialEq for u32 {
 276     fn eq(&self, other: &u32) -> bool {
 277         (*self) == (*other)
 278     }
 279     fn ne(&self, other: &u32) -> bool {
 280         (*self) != (*other)
 281     }
 282 }
 283
 284
 285 impl PartialEq for u64 {
 286     fn eq(&self, other: &u64) -> bool {
 287         (*self) == (*other)
 288     }
 289     fn ne(&self, other: &u64) -> bool {
 290         (*self) != (*other)
 291     }
 292 }
 293
 294 impl PartialEq for usize {
 295     fn eq(&self, other: &usize) -> bool {
 296         (*self) == (*other)
 297     }
 298     fn ne(&self, other: &usize) -> bool {
 299         (*self) != (*other)
 300     }
 301 }
 302
 303 impl PartialEq for i8 {
 304     fn eq(&self, other: &i8) -> bool {
 305         (*self) == (*other)
 306     }
 307     fn ne(&self, other: &i8) -> bool {
 308         (*self) != (*other)
 309     }
 310 }
 311
 312 impl PartialEq for i32 {
 313     fn eq(&self, other: &i32) -> bool {
 314         (*self) == (*other)
 315     }
 316     fn ne(&self, other: &i32) -> bool {
 317         (*self) != (*other)
 318     }
 319 }
 320
 321 impl PartialEq for isize {
 322     fn eq(&self, other: &isize) -> bool {
 323         (*self) == (*other)
 324     }
 325     fn ne(&self, other: &isize) -> bool {
 326         (*self) != (*other)
 327     }
 328 }
 329
 330 impl PartialEq for char {
 331     fn eq(&self, other: &char) -> bool {
 332         (*self) == (*other)
 333     }
 334     fn ne(&self, other: &char) -> bool {
 335         (*self) != (*other)
 336     }
 337 }
 338
 339 impl<T: ?Sized> PartialEq for *const T {
 340     fn eq(&self, other: &*const T) -> bool {
 341         *self == *other
 342     }
 343     fn ne(&self, other: &*const T) -> bool {
 344         *self != *other
 345     }
 346 }
 347
 348 #[lang = "neg"]
 349 pub trait Neg {
 350     type Output;
 351
 352     fn neg(self) -> Self::Output;
 353 }
 354
 355 impl Neg for i8 {
 356     type Output = i8;
 357
 358     fn neg(self) -> i8 {
 359         -self
 360     }
 361 }
 362
 363 impl Neg for i16 {
 364     type Output = i16;
 365
 366     fn neg(self) -> i16 {
 367         self
 368     }
 369 }
 370
 371 impl Neg for isize {
 372     type Output = isize;
 373
 374     fn neg(self) -> isize {
 375         -self
 376     }
 377 }
 378
 379 impl Neg for f32 {
 380     type Output = f32;
 381
 382     fn neg(self) -> f32 {
 383         -self
 384     }
 385 }
 386
 387 pub enum Option<T> {
 388     Some(T),
 389     None,
 390 }
 391
 392 pub use Option::*;
 393
 394 #[lang = "phantom_data"]
 395 pub struct PhantomData<T: ?Sized>;
 396
 397 #[lang = "fn_once"]
 398 #[rustc_paren_sugar]
 399 pub trait FnOnce<Args> {
 400     #[lang = "fn_once_output"]
 401     type Output;
 402
 403     extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
 404 }
 405
 406 #[lang = "fn_mut"]
 407 #[rustc_paren_sugar]
 408 pub trait FnMut<Args>: FnOnce<Args> {
 409     extern "rust-call" fn call_mut(&mut self, args: Args) -> Self::Output;
 410 }
 411
 412 #[lang = "panic"]
 413 #[track_caller]
 414 pub fn panic(_msg: &str) -> ! {
 415     unsafe {
 416         libc::puts("Panicking\n\0" as *const str as *const u8);
 417         intrinsics::abort();
 418     }
 419 }
 420
 421 #[lang = "panic_bounds_check"]
 422 #[track_caller]
 423 fn panic_bounds_check(index: usize, len: usize) -> ! {
 424     unsafe {
 425         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);
 426         intrinsics::abort();
 427     }
 428 }
 429
 430 #[lang = "eh_personality"]
 431 fn eh_personality() -> ! {
 432     loop {}
 433 }
 434
 435 #[lang = "drop_in_place"]
 436 #[allow(unconditional_recursion)]
 437 pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
 438     // Code here does not matter - this is replaced by the
 439     // real drop glue by the compiler.
 440     drop_in_place(to_drop);
 441 }
 442
 443 #[lang = "deref"]
 444 pub trait Deref {
 445     type Target: ?Sized;
 446
 447     fn deref(&self) -> &Self::Target;
 448 }
 449
 450 pub trait Allocator {
 451 }
 452
 453 pub struct Global;
 454
 455 impl Allocator for Global {}
 456
 457 #[lang = "owned_box"]
 458 pub struct Box<
 459     T: ?Sized,
 460     A: Allocator = Global,
 461 >(*mut T, A);
 462
 463 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Box<U>> for Box<T> {}
 464
 465 impl<T: ?Sized, A: Allocator> Drop for Box<T, A> {
 466     fn drop(&mut self) {
 467         // drop is currently performed by compiler.
 468     }
 469 }
 470
 471 impl<T> Deref for Box<T> {
 472     type Target = T;
 473
 474     fn deref(&self) -> &Self::Target {
 475         &**self
 476     }
 477 }
 478
 479 #[lang = "exchange_malloc"]
 480 unsafe fn allocate(size: usize, _align: usize) -> *mut u8 {
 481     libc::malloc(size)
 482 }
 483
 484 #[lang = "box_free"]
 485 unsafe fn box_free<T: ?Sized, A: Allocator>(ptr: *mut T, alloc: A) {
 486     libc::free(ptr as *mut u8);
 487 }
 488
 489 #[lang = "drop"]
 490 pub trait Drop {
 491     fn drop(&mut self);
 492 }
 493
 494 #[lang = "manually_drop"]
 495 #[repr(transparent)]
 496 pub struct ManuallyDrop<T: ?Sized> {
 497     pub value: T,
 498 }
 499
 500 #[lang = "maybe_uninit"]
 501 #[repr(transparent)]
 502 pub union MaybeUninit<T> {
 503     pub uninit: (),
 504     pub value: ManuallyDrop<T>,
 505 }
 506
 507 pub mod intrinsics {
 508     extern "rust-intrinsic" {
 509         pub fn abort() -> !;
 510         pub fn size_of<T>() -> usize;
 511         pub fn size_of_val<T: ?::Sized>(val: *const T) -> usize;
 512         pub fn min_align_of<T>() -> usize;
 513         pub fn min_align_of_val<T: ?::Sized>(val: *const T) -> usize;
 514         pub fn copy<T>(src: *const T, dst: *mut T, count: usize);
 515         pub fn transmute<T, U>(e: T) -> U;
 516         pub fn ctlz_nonzero<T>(x: T) -> T;
 517         pub fn needs_drop<T>() -> bool;
 518         pub fn bitreverse<T>(x: T) -> T;
 519         pub fn bswap<T>(x: T) -> T;
 520         pub fn write_bytes<T>(dst: *mut T, val: u8, count: usize);
 521         pub fn unreachable() -> !;
 522     }
 523 }
 524
 525 pub mod libc {
 526     #[link(name = "c")]
 527     extern "C" {
 528         pub fn puts(s: *const u8) -> i32;
 529         pub fn printf(format: *const i8, ...) -> i32;
 530         pub fn malloc(size: usize) -> *mut u8;
 531         pub fn free(ptr: *mut u8);
 532         pub fn memcpy(dst: *mut u8, src: *const u8, size: usize);
 533         pub fn memmove(dst: *mut u8, src: *const u8, size: usize);
 534         pub fn strncpy(dst: *mut u8, src: *const u8, size: usize);
 535     }
 536 }
 537
 538 #[lang = "index"]
 539 pub trait Index<Idx: ?Sized> {
 540     type Output: ?Sized;
 541     fn index(&self, index: Idx) -> &Self::Output;
 542 }
 543
 544 impl<T> Index<usize> for [T; 3] {
 545     type Output = T;
 546
 547     fn index(&self, index: usize) -> &Self::Output {
 548         &self[index]
 549     }
 550 }
 551
 552 impl<T> Index<usize> for [T] {
 553     type Output = T;
 554
 555     fn index(&self, index: usize) -> &Self::Output {
 556         &self[index]
 557     }
 558 }
 559
 560 extern {
 561     type VaListImpl;
 562 }
 563
 564 #[lang = "va_list"]
 565 #[repr(transparent)]
 566 pub struct VaList<'a>(&'a mut VaListImpl);
 567
 568 #[rustc_builtin_macro]
 569 #[rustc_macro_transparency = "semitransparent"]
 570 pub macro stringify($($t:tt)*) { /* compiler built-in */ }
 571
 572 #[rustc_builtin_macro]
 573 #[rustc_macro_transparency = "semitransparent"]
 574 pub macro file() { /* compiler built-in */ }
 575
 576 #[rustc_builtin_macro]
 577 #[rustc_macro_transparency = "semitransparent"]
 578 pub macro line() { /* compiler built-in */ }
 579
 580 #[rustc_builtin_macro]
 581 #[rustc_macro_transparency = "semitransparent"]
 582 pub macro cfg() { /* compiler built-in */ }
 583
 584 pub static A_STATIC: u8 = 42;
 585
 586 #[lang = "panic_location"]
 587 struct PanicLocation {
 588     file: &'static str,
 589     line: u32,
 590     column: u32,
 591 }
 592
 593 #[no_mangle]
 594 pub fn get_tls() -> u8 {
 595     #[thread_local]
 596     static A: u8 = 42;
 597
 598     A
 599 }