1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
//! # The Rust Core Library
//!
//! The Rust Core Library is the dependency-free[^free] foundation of [The
//! Rust Standard Library](../std/index.html). It is the portable glue
//! between the language and its libraries, defining the intrinsic and
//! primitive building blocks of all Rust code. It links to no
//! upstream libraries, no system libraries, and no libc.
//!
//! [^free]: Strictly speaking, there are some symbols which are needed but
//!          they aren't always necessary.
//!
//! The core library is *minimal*: it isn't even aware of heap allocation,
//! nor does it provide concurrency or I/O. These things require
//! platform integration, and this library is platform-agnostic.
//!
//! # How to use the core library
//!
//! Please note that all of these details are currently not considered stable.
//!
// FIXME: Fill me in with more detail when the interface settles
//! This library is built on the assumption of a few existing symbols:
//!
//! * `memcpy`, `memcmp`, `memset` - These are core memory routines which are
//!   often generated by LLVM. Additionally, this library can make explicit
//!   calls to these functions. Their signatures are the same as found in C.
//!   These functions are often provided by the system libc, but can also be
//!   provided by the [compiler-builtins crate](https://crates.io/crates/compiler_builtins).
//!
//! * `rust_begin_panic` - This function takes four arguments, a
//!   `fmt::Arguments`, a `&'static str`, and two `u32`'s. These four arguments
//!   dictate the panic message, the file at which panic was invoked, and the
//!   line and column inside the file. It is up to consumers of this core
//!   library to define this panic function; it is only required to never
//!   return. This requires a `lang` attribute named `panic_impl`.
//!
//! * `rust_eh_personality` - is used by the failure mechanisms of the
//!    compiler. This is often mapped to GCC's personality function, but crates
//!    which do not trigger a panic can be assured that this function is never
//!    called. The `lang` attribute is called `eh_personality`.

// Since libcore defines many fundamental lang items, all tests live in a
// separate crate, libcoretest, to avoid bizarre issues.
//
// Here we explicitly #[cfg]-out this whole crate when testing. If we don't do
// this, both the generated test artifact and the linked libtest (which
// transitively includes libcore) will both define the same set of lang items,
// and this will cause the E0152 "found duplicate lang item" error. See
// discussion in #50466 for details.
//
// This cfg won't affect doc tests.
#![cfg(not(test))]
// To run libcore tests without x.py without ending up with two copies of libcore, Miri needs to be
// able to "empty" this crate. See <https://github.com/rust-lang/miri-test-libstd/issues/4>.
// rustc itself never sets the feature, so this line has no affect there.
#![cfg(any(not(feature = "miri-test-libstd"), test, doctest))]
#![stable(feature = "core", since = "1.6.0")]
#![doc(
    html_playground_url = "https://play.rust-lang.org/",
    issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
    test(no_crate_inject, attr(deny(warnings))),
    test(attr(allow(dead_code, deprecated, unused_variables, unused_mut)))
)]
#![doc(cfg_hide(
    not(test),
    any(not(feature = "miri-test-libstd"), test, doctest),
    no_fp_fmt_parse,
    target_pointer_width = "16",
    target_pointer_width = "32",
    target_pointer_width = "64",
    target_has_atomic = "8",
    target_has_atomic = "16",
    target_has_atomic = "32",
    target_has_atomic = "64",
    target_has_atomic = "ptr",
    target_has_atomic_equal_alignment = "8",
    target_has_atomic_equal_alignment = "16",
    target_has_atomic_equal_alignment = "32",
    target_has_atomic_equal_alignment = "64",
    target_has_atomic_equal_alignment = "ptr",
    target_has_atomic_load_store = "8",
    target_has_atomic_load_store = "16",
    target_has_atomic_load_store = "32",
    target_has_atomic_load_store = "64",
    target_has_atomic_load_store = "ptr",
))]
#![no_core]
//
// Lints:
#![deny(rust_2021_incompatible_or_patterns)]
#![deny(unsafe_op_in_unsafe_fn)]
#![warn(deprecated_in_future)]
#![warn(missing_debug_implementations)]
#![warn(missing_docs)]
#![allow(explicit_outlives_requirements)]
//
// Library features for const fns:
#![feature(const_align_offset)]
#![feature(const_align_of_val)]
#![feature(const_alloc_layout)]
#![feature(const_arguments_as_str)]
#![feature(const_array_into_iter_constructors)]
#![feature(const_bigint_helper_methods)]
#![feature(const_black_box)]
#![feature(const_caller_location)]
#![feature(const_cell_into_inner)]
#![feature(const_char_convert)]
#![feature(const_discriminant)]
#![feature(const_eval_select)]
#![feature(const_float_bits_conv)]
#![feature(const_float_classify)]
#![feature(const_fmt_arguments_new)]
#![feature(const_heap)]
#![feature(const_convert)]
#![feature(const_inherent_unchecked_arith)]
#![feature(const_int_unchecked_arith)]
#![feature(const_intrinsic_copy)]
#![feature(const_intrinsic_forget)]
#![feature(const_likely)]
#![feature(const_maybe_uninit_as_mut_ptr)]
#![feature(const_maybe_uninit_assume_init)]
#![feature(const_num_from_num)]
#![feature(const_ops)]
#![feature(const_option)]
#![feature(const_option_ext)]
#![feature(const_pin)]
#![feature(const_replace)]
#![feature(const_ptr_is_null)]
#![feature(const_ptr_offset)]
#![feature(const_ptr_offset_from)]
#![feature(const_ptr_read)]
#![feature(const_ptr_write)]
#![feature(const_raw_ptr_comparison)]
#![feature(const_size_of_val)]
#![feature(const_slice_from_raw_parts)]
#![feature(const_slice_ptr_len)]
#![feature(const_str_from_utf8_unchecked_mut)]
#![feature(const_swap)]
#![feature(const_trait_impl)]
#![feature(const_type_id)]
#![feature(const_type_name)]
#![feature(const_default_impls)]
#![feature(core_panic)]
#![feature(duration_consts_float)]
#![feature(maybe_uninit_uninit_array)]
#![feature(ptr_metadata)]
#![feature(slice_ptr_get)]
#![feature(str_internals)]
#![feature(variant_count)]
#![feature(const_array_from_ref)]
#![feature(const_slice_from_ref)]
//
// Language features:
#![feature(abi_unadjusted)]
#![feature(allow_internal_unsafe)]
#![feature(allow_internal_unstable)]
#![feature(associated_type_bounds)]
#![feature(auto_traits)]
#![feature(cfg_target_has_atomic)]
#![feature(const_fn_floating_point_arithmetic)]
#![feature(const_fn_fn_ptr_basics)]
#![feature(const_fn_trait_bound)]
#![feature(const_impl_trait)]
#![feature(const_mut_refs)]
#![feature(const_precise_live_drops)]
#![feature(const_refs_to_cell)]
#![feature(decl_macro)]
#![feature(derive_default_enum)]
#![feature(doc_cfg)]
#![feature(doc_notable_trait)]
#![feature(rustdoc_internals)]
#![feature(exhaustive_patterns)]
#![feature(doc_cfg_hide)]
#![feature(extern_types)]
#![feature(fundamental)]
#![feature(if_let_guard)]
#![feature(intra_doc_pointers)]
#![feature(intrinsics)]
#![feature(lang_items)]
#![feature(link_llvm_intrinsics)]
#![feature(min_specialization)]
#![feature(mixed_integer_ops)]
#![feature(must_not_suspend)]
#![feature(negative_impls)]
#![feature(never_type)]
#![feature(no_core)]
#![feature(no_coverage)] // rust-lang/rust#84605
#![feature(no_niche)] // rust-lang/rust#68303
#![feature(platform_intrinsics)]
#![feature(prelude_import)]
#![feature(repr_simd)]
#![feature(rustc_allow_const_fn_unstable)]
#![feature(rustc_attrs)]
#![feature(simd_ffi)]
#![feature(staged_api)]
#![feature(stmt_expr_attributes)]
#![feature(trait_alias)]
#![feature(transparent_unions)]
#![feature(try_blocks)]
#![feature(unboxed_closures)]
#![feature(unsized_fn_params)]
#![feature(asm_const)]
//
// Target features:
#![feature(aarch64_target_feature)]
#![feature(adx_target_feature)]
#![feature(arm_target_feature)]
#![feature(avx512_target_feature)]
#![feature(cmpxchg16b_target_feature)]
#![feature(f16c_target_feature)]
#![feature(hexagon_target_feature)]
#![feature(mips_target_feature)]
#![feature(powerpc_target_feature)]
#![feature(rtm_target_feature)]
#![feature(sse4a_target_feature)]
#![feature(tbm_target_feature)]
#![feature(wasm_target_feature)]

// allow using `core::` in intra-doc links
#[allow(unused_extern_crates)]
extern crate self as core;

#[prelude_import]
#[allow(unused)]
use prelude::v1::*;

#[cfg(not(test))] // See #65860
#[macro_use]
mod macros;

// We don't export this through #[macro_export] for now, to avoid breakage.
// See https://github.com/rust-lang/rust/issues/82913
#[cfg(not(test))]
#[unstable(feature = "assert_matches", issue = "82775")]
/// Unstable module containing the unstable `assert_matches` macro.
pub mod assert_matches {
    #[unstable(feature = "assert_matches", issue = "82775")]
    pub use crate::macros::{assert_matches, debug_assert_matches};
}

#[macro_use]
mod internal_macros;

#[path = "num/shells/int_macros.rs"]
#[macro_use]
mod int_macros;

#[path = "num/shells/i128.rs"]
pub mod i128;
#[path = "num/shells/i16.rs"]
pub mod i16;
#[path = "num/shells/i32.rs"]
pub mod i32;
#[path = "num/shells/i64.rs"]
pub mod i64;
#[path = "num/shells/i8.rs"]
pub mod i8;
#[path = "num/shells/isize.rs"]
pub mod isize;

#[path = "num/shells/u128.rs"]
pub mod u128;
#[path = "num/shells/u16.rs"]
pub mod u16;
#[path = "num/shells/u32.rs"]
pub mod u32;
#[path = "num/shells/u64.rs"]
pub mod u64;
#[path = "num/shells/u8.rs"]
pub mod u8;
#[path = "num/shells/usize.rs"]
pub mod usize;

#[path = "num/f32.rs"]
pub mod f32;
#[path = "num/f64.rs"]
pub mod f64;

#[macro_use]
pub mod num;

/* The libcore prelude, not as all-encompassing as the libstd prelude */

pub mod prelude;

/* Core modules for ownership management */

pub mod hint;
pub mod intrinsics;
pub mod mem;
pub mod ptr;

/* Core language traits */

pub mod borrow;
pub mod clone;
pub mod cmp;
pub mod convert;
pub mod default;
pub mod marker;
pub mod ops;

/* Core types and methods on primitives */

pub mod any;
pub mod array;
pub mod ascii;
pub mod cell;
pub mod char;
pub mod ffi;
pub mod iter;
#[unstable(feature = "once_cell", issue = "74465")]
pub mod lazy;
pub mod option;
pub mod panic;
pub mod panicking;
pub mod pin;
pub mod result;
#[unstable(feature = "async_stream", issue = "79024")]
pub mod stream;
pub mod sync;

pub mod fmt;
pub mod hash;
pub mod slice;
pub mod str;
pub mod time;

pub mod unicode;

/* Async */
pub mod future;
pub mod task;

/* Heap memory allocator trait */
#[allow(missing_docs)]
pub mod alloc;

// note: does not need to be public
mod bool;
mod tuple;
mod unit;

#[stable(feature = "core_primitive", since = "1.43.0")]
pub mod primitive;

// Pull in the `core_arch` crate directly into libcore. The contents of
// `core_arch` are in a different repository: rust-lang/stdarch.
//
// `core_arch` depends on libcore, but the contents of this module are
// set up in such a way that directly pulling it here works such that the
// crate uses the this crate as its libcore.
#[path = "../../stdarch/crates/core_arch/src/mod.rs"]
#[allow(
    missing_docs,
    missing_debug_implementations,
    dead_code,
    unused_imports,
    unsafe_op_in_unsafe_fn
)]
#[allow(rustdoc::bare_urls)]
// FIXME: This annotation should be moved into rust-lang/stdarch after clashing_extern_declarations is
// merged. It currently cannot because bootstrap fails as the lint hasn't been defined yet.
#[allow(clashing_extern_declarations)]
#[unstable(feature = "stdsimd", issue = "48556")]
mod core_arch;

#[doc = include_str!("../../stdarch/crates/core_arch/src/core_arch_docs.md")]
#[stable(feature = "simd_arch", since = "1.27.0")]
pub mod arch {
    #[stable(feature = "simd_arch", since = "1.27.0")]
    pub use crate::core_arch::arch::*;

    /// Inline assembly.
    ///
    /// Refer to [rust by example] for a usage guide and the [reference] for
    /// detailed information about the syntax and available options.
    ///
    /// [rust by example]: https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html
    /// [reference]: https://doc.rust-lang.org/nightly/reference/inline-assembly.html
    #[stable(feature = "asm", since = "1.59.0")]
    #[rustc_builtin_macro]
    pub macro asm("assembly template", $(operands,)* $(options($(option),*))?) {
        /* compiler built-in */
    }

    /// Module-level inline assembly.
    ///
    /// Refer to [rust by example] for a usage guide and the [reference] for
    /// detailed information about the syntax and available options.
    ///
    /// [rust by example]: https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html
    /// [reference]: https://doc.rust-lang.org/nightly/reference/inline-assembly.html
    #[stable(feature = "global_asm", since = "1.59.0")]
    #[rustc_builtin_macro]
    pub macro global_asm("assembly template", $(operands,)* $(options($(option),*))?) {
        /* compiler built-in */
    }
}

// Pull in the `core_simd` crate directly into libcore. The contents of
// `core_simd` are in a different repository: rust-lang/portable-simd.
//
// `core_simd` depends on libcore, but the contents of this module are
// set up in such a way that directly pulling it here works such that the
// crate uses this crate as its libcore.
#[path = "../../portable-simd/crates/core_simd/src/mod.rs"]
#[allow(missing_debug_implementations, dead_code, unsafe_op_in_unsafe_fn, unused_unsafe)]
#[allow(rustdoc::bare_urls)]
#[unstable(feature = "portable_simd", issue = "86656")]
#[cfg(not(all(miri, doctest)))] // Miri does not support all SIMD intrinsics
mod core_simd;

#[doc = include_str!("../../portable-simd/crates/core_simd/src/core_simd_docs.md")]
#[unstable(feature = "portable_simd", issue = "86656")]
#[cfg(not(all(miri, doctest)))] // Miri does not support all SIMD intrinsics
pub mod simd {
    #[unstable(feature = "portable_simd", issue = "86656")]
    pub use crate::core_simd::simd::*;
}

include!("primitive_docs.rs");