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1 //! # The Rust Core Library
2 //!
3 //! The Rust Core Library is the dependency-free[^free] foundation of [The
4 //! Rust Standard Library](../std/index.html). It is the portable glue
5 //! between the language and its libraries, defining the intrinsic and
6 //! primitive building blocks of all Rust code. It links to no
7 //! upstream libraries, no system libraries, and no libc.
8 //!
9 //! [^free]: Strictly speaking, there are some symbols which are needed but
10 //!          they aren't always necessary.
11 //!
12 //! The core library is *minimal*: it isn't even aware of heap allocation,
13 //! nor does it provide concurrency or I/O. These things require
14 //! platform integration, and this library is platform-agnostic.
15 //!
16 //! # How to use the core library
17 //!
18 //! Please note that all of these details are currently not considered stable.
19 //!
20 // FIXME: Fill me in with more detail when the interface settles
21 //! This library is built on the assumption of a few existing symbols:
22 //!
23 //! * `memcpy`, `memcmp`, `memset` - These are core memory routines which are
24 //!   often generated by LLVM. Additionally, this library can make explicit
25 //!   calls to these functions. Their signatures are the same as found in C.
26 //!   These functions are often provided by the system libc, but can also be
27 //!   provided by the [rlibc crate](https://crates.io/crates/rlibc).
28 //!
29 //! * `rust_begin_panic` - This function takes four arguments, a
30 //!   `fmt::Arguments`, a `&'static str`, and two `u32`'s. These four arguments
31 //!   dictate the panic message, the file at which panic was invoked, and the
32 //!   line and column inside the file. It is up to consumers of this core
33 //!   library to define this panic function; it is only required to never
34 //!   return. This requires a `lang` attribute named `panic_impl`.
35 //!
36 //! * `rust_eh_personality` - is used by the failure mechanisms of the
37 //!    compiler. This is often mapped to GCC's personality function, but crates
38 //!    which do not trigger a panic can be assured that this function is never
39 //!    called. The `lang` attribute is called `eh_personality`.
40
41 // Since libcore defines many fundamental lang items, all tests live in a
42 // separate crate, libcoretest, to avoid bizarre issues.
43 //
44 // Here we explicitly #[cfg]-out this whole crate when testing. If we don't do
45 // this, both the generated test artifact and the linked libtest (which
46 // transitively includes libcore) will both define the same set of lang items,
47 // and this will cause the E0152 "duplicate lang item found" error. See
48 // discussion in #50466 for details.
49 //
50 // This cfg won't affect doc tests.
51 #![cfg(not(test))]
52
53 #![stable(feature = "core", since = "1.6.0")]
54 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
55        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
56        html_root_url = "https://doc.rust-lang.org/nightly/",
57        html_playground_url = "https://play.rust-lang.org/",
58        issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
59        test(no_crate_inject, attr(deny(warnings))),
60        test(attr(allow(dead_code, deprecated, unused_variables, unused_mut))))]
61
62 #![no_core]
63 #![deny(missing_docs)]
64 #![deny(intra_doc_link_resolution_failure)]
65 #![deny(missing_debug_implementations)]
66
67 #![feature(allow_internal_unstable)]
68 #![feature(arbitrary_self_types)]
69 #![feature(asm)]
70 #![feature(associated_type_defaults)]
71 #![feature(cfg_target_has_atomic)]
72 #![feature(concat_idents)]
73 #![feature(const_fn)]
74 #![cfg_attr(stage0, feature(const_int_ops))]
75 #![feature(const_fn_union)]
76 #![feature(custom_attribute)]
77 #![feature(doc_cfg)]
78 #![feature(doc_spotlight)]
79 #![feature(extern_types)]
80 #![feature(fundamental)]
81 #![feature(intrinsics)]
82 #![feature(iter_once_with)]
83 #![feature(lang_items)]
84 #![feature(link_llvm_intrinsics)]
85 #![feature(never_type)]
86 #![feature(nll)]
87 #![feature(bind_by_move_pattern_guards)]
88 #![feature(exhaustive_patterns)]
89 #![feature(no_core)]
90 #![feature(on_unimplemented)]
91 #![feature(optin_builtin_traits)]
92 #![feature(prelude_import)]
93 #![feature(repr_simd, platform_intrinsics)]
94 #![feature(rustc_attrs)]
95 #![feature(rustc_const_unstable)]
96 #![feature(simd_ffi)]
97 #![feature(specialization)]
98 #![feature(staged_api)]
99 #![feature(stmt_expr_attributes)]
100 #![feature(unboxed_closures)]
101 #![feature(unsized_locals)]
102 #![feature(untagged_unions)]
103 #![feature(unwind_attributes)]
104 #![feature(doc_alias)]
105 #![feature(mmx_target_feature)]
106 #![feature(tbm_target_feature)]
107 #![feature(sse4a_target_feature)]
108 #![feature(arm_target_feature)]
109 #![feature(powerpc_target_feature)]
110 #![feature(mips_target_feature)]
111 #![feature(aarch64_target_feature)]
112 #![feature(wasm_target_feature)]
113 #![feature(avx512_target_feature)]
114 #![cfg_attr(not(stage0), feature(cmpxchg16b_target_feature))]
115 #![feature(const_slice_len)]
116 #![feature(const_str_as_bytes)]
117 #![feature(const_str_len)]
118 #![cfg_attr(stage0, feature(const_let))]
119 #![cfg_attr(stage0, feature(const_int_rotate))]
120 #![feature(const_int_conversion)]
121 #![feature(const_transmute)]
122 #![feature(reverse_bits)]
123 #![feature(non_exhaustive)]
124 #![feature(structural_match)]
125 #![feature(abi_unadjusted)]
126 #![cfg_attr(not(stage0), feature(adx_target_feature))]
127
128 #[prelude_import]
129 #[allow(unused)]
130 use prelude::v1::*;
131
132 #[macro_use]
133 mod macros;
134
135 #[macro_use]
136 mod internal_macros;
137
138 #[path = "num/int_macros.rs"]
139 #[macro_use]
140 mod int_macros;
141
142 #[path = "num/uint_macros.rs"]
143 #[macro_use]
144 mod uint_macros;
145
146 #[path = "num/isize.rs"] pub mod isize;
147 #[path = "num/i8.rs"]    pub mod i8;
148 #[path = "num/i16.rs"]   pub mod i16;
149 #[path = "num/i32.rs"]   pub mod i32;
150 #[path = "num/i64.rs"]   pub mod i64;
151 #[path = "num/i128.rs"]  pub mod i128;
152
153 #[path = "num/usize.rs"] pub mod usize;
154 #[path = "num/u8.rs"]    pub mod u8;
155 #[path = "num/u16.rs"]   pub mod u16;
156 #[path = "num/u32.rs"]   pub mod u32;
157 #[path = "num/u64.rs"]   pub mod u64;
158 #[path = "num/u128.rs"]  pub mod u128;
159
160 #[path = "num/f32.rs"]   pub mod f32;
161 #[path = "num/f64.rs"]   pub mod f64;
162
163 #[macro_use]
164 pub mod num;
165
166 /* The libcore prelude, not as all-encompassing as the libstd prelude */
167
168 pub mod prelude;
169
170 /* Core modules for ownership management */
171
172 pub mod intrinsics;
173 pub mod mem;
174 pub mod ptr;
175 pub mod hint;
176
177 /* Core language traits */
178
179 pub mod marker;
180 pub mod ops;
181 pub mod cmp;
182 pub mod clone;
183 pub mod default;
184 pub mod convert;
185 pub mod borrow;
186
187 /* Core types and methods on primitives */
188
189 pub mod any;
190 pub mod array;
191 pub mod ascii;
192 pub mod sync;
193 pub mod cell;
194 pub mod char;
195 pub mod panic;
196 pub mod panicking;
197 pub mod pin;
198 pub mod iter;
199 pub mod option;
200 pub mod raw;
201 pub mod result;
202 pub mod ffi;
203
204 pub mod slice;
205 pub mod str;
206 pub mod hash;
207 pub mod fmt;
208 pub mod time;
209
210 pub mod unicode;
211
212 /* Async */
213 pub mod future;
214 pub mod task;
215
216 /* Heap memory allocator trait */
217 #[allow(missing_docs)]
218 pub mod alloc;
219
220 // note: does not need to be public
221 mod iter_private;
222 mod tuple;
223 mod unit;
224
225 // Pull in the `coresimd` crate directly into libcore. This is where all the
226 // architecture-specific (and vendor-specific) intrinsics are defined. AKA
227 // things like SIMD and such. Note that the actual source for all this lies in a
228 // different repository, rust-lang-nursery/stdsimd. That's why the setup here is
229 // a bit wonky.
230 #[allow(unused_macros)]
231 macro_rules! test_v16 { ($item:item) => {}; }
232 #[allow(unused_macros)]
233 macro_rules! test_v32 { ($item:item) => {}; }
234 #[allow(unused_macros)]
235 macro_rules! test_v64 { ($item:item) => {}; }
236 #[allow(unused_macros)]
237 macro_rules! test_v128 { ($item:item) => {}; }
238 #[allow(unused_macros)]
239 macro_rules! test_v256 { ($item:item) => {}; }
240 #[allow(unused_macros)]
241 macro_rules! test_v512 { ($item:item) => {}; }
242 #[allow(unused_macros)]
243 macro_rules! vector_impl { ($([$f:ident, $($args:tt)*]),*) => { $($f!($($args)*);)* } }
244 #[path = "../stdsimd/coresimd/mod.rs"]
245 #[allow(missing_docs, missing_debug_implementations, dead_code, unused_imports)]
246 #[unstable(feature = "stdsimd", issue = "48556")]
247 mod coresimd;
248
249 #[stable(feature = "simd_arch", since = "1.27.0")]
250 pub use coresimd::arch;