mirror of https://github.com/rust-lang/rust
476 lines
15 KiB
Rust
476 lines
15 KiB
Rust
//! # The Rust Core Library
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//!
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//! The Rust Core Library is the dependency-free[^free] foundation of [The
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//! Rust Standard Library](../std/index.html). It is the portable glue
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//! between the language and its libraries, defining the intrinsic and
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//! primitive building blocks of all Rust code. It links to no
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//! upstream libraries, no system libraries, and no libc.
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//!
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//! [^free]: Strictly speaking, there are some symbols which are needed but
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//! they aren't always necessary.
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//!
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//! The core library is *minimal*: it isn't even aware of heap allocation,
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//! nor does it provide concurrency or I/O. These things require
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//! platform integration, and this library is platform-agnostic.
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//!
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//! # How to use the core library
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//!
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//! Please note that all of these details are currently not considered stable.
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//!
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// FIXME: Fill me in with more detail when the interface settles
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//! This library is built on the assumption of a few existing symbols:
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//!
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//! * `memcpy`, `memmove`, `memset`, `memcmp`, `bcmp`, `strlen` - These are core memory routines
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//! which are generated by Rust codegen backends. Additionally, this library can make explicit
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//! calls to `strlen`. Their signatures are the same as found in C, but there are extra
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//! assumptions about their semantics: For `memcpy`, `memmove`, `memset`, `memcmp`, and `bcmp`, if
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//! the `n` parameter is 0, the function is assumed to not be UB, even if the pointers are NULL or
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//! dangling. (Note that making extra assumptions about these functions is common among compilers:
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//! [clang](https://reviews.llvm.org/D86993) and [GCC](https://gcc.gnu.org/onlinedocs/gcc/Standards.html#C-Language) do the same.)
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//! These functions are often provided by the system libc, but can also be provided by the
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//! [compiler-builtins crate](https://crates.io/crates/compiler_builtins).
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//! Note that the library does not guarantee that it will always make these assumptions, so Rust
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//! user code directly calling the C functions should follow the C specification! The advice for
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//! Rust user code is to call the functions provided by this library instead (such as
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//! `ptr::copy`).
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//!
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//! * `rust_begin_panic` - This function takes four arguments, a
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//! `fmt::Arguments`, a `&'static str`, and two `u32`'s. These four arguments
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//! dictate the panic message, the file at which panic was invoked, and the
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//! line and column inside the file. It is up to consumers of this core
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//! library to define this panic function; it is only required to never
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//! return. This requires a `lang` attribute named `panic_impl`.
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//!
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//! * `rust_eh_personality` - is used by the failure mechanisms of the
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//! compiler. This is often mapped to GCC's personality function, but crates
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//! which do not trigger a panic can be assured that this function is never
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//! called. The `lang` attribute is called `eh_personality`.
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// Since core defines many fundamental lang items, all tests live in a
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// separate crate, libcoretest (library/core/tests), to avoid bizarre issues.
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//
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// Here we explicitly #[cfg]-out this whole crate when testing. If we don't do
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// this, both the generated test artifact and the linked libtest (which
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// transitively includes core) will both define the same set of lang items,
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// and this will cause the E0152 "found duplicate lang item" error. See
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// discussion in #50466 for details.
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//
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// This cfg won't affect doc tests.
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#![cfg(not(test))]
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//
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#![stable(feature = "core", since = "1.6.0")]
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#![doc(
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html_playground_url = "https://play.rust-lang.org/",
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issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
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test(no_crate_inject, attr(deny(warnings))),
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test(attr(allow(dead_code, deprecated, unused_variables, unused_mut)))
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)]
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#![doc(rust_logo)]
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#![doc(cfg_hide(
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not(test),
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no_fp_fmt_parse,
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target_pointer_width = "16",
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target_pointer_width = "32",
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target_pointer_width = "64",
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target_has_atomic = "8",
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target_has_atomic = "16",
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target_has_atomic = "32",
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target_has_atomic = "64",
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target_has_atomic = "ptr",
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target_has_atomic_equal_alignment = "8",
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target_has_atomic_equal_alignment = "16",
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target_has_atomic_equal_alignment = "32",
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target_has_atomic_equal_alignment = "64",
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target_has_atomic_equal_alignment = "ptr",
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target_has_atomic_load_store = "8",
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target_has_atomic_load_store = "16",
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target_has_atomic_load_store = "32",
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target_has_atomic_load_store = "64",
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target_has_atomic_load_store = "ptr",
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))]
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#![no_core]
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#![rustc_coherence_is_core]
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#![rustc_preserve_ub_checks]
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//
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// Lints:
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#![deny(rust_2021_incompatible_or_patterns)]
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#![deny(unsafe_op_in_unsafe_fn)]
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#![deny(fuzzy_provenance_casts)]
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#![warn(deprecated_in_future)]
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#![warn(missing_debug_implementations)]
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#![warn(missing_docs)]
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#![allow(explicit_outlives_requirements)]
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#![allow(incomplete_features)]
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#![warn(multiple_supertrait_upcastable)]
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#![allow(internal_features)]
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#![deny(ffi_unwind_calls)]
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// Do not check link redundancy on bootstraping phase
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#![allow(rustdoc::redundant_explicit_links)]
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//
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// Library features:
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// tidy-alphabetical-start
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#![feature(array_ptr_get)]
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#![feature(asm_experimental_arch)]
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#![feature(char_indices_offset)]
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#![feature(const_align_of_val)]
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#![feature(const_align_of_val_raw)]
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#![feature(const_align_offset)]
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#![feature(const_alloc_layout)]
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#![feature(const_arguments_as_str)]
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#![feature(const_array_from_ref)]
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#![feature(const_array_into_iter_constructors)]
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#![feature(const_bigint_helper_methods)]
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#![feature(const_black_box)]
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#![feature(const_cell_into_inner)]
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#![feature(const_char_from_u32_unchecked)]
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#![feature(const_eval_select)]
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#![feature(const_exact_div)]
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#![feature(const_float_bits_conv)]
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#![feature(const_float_classify)]
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#![feature(const_fmt_arguments_new)]
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#![feature(const_hash)]
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#![feature(const_heap)]
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#![feature(const_hint_assert_unchecked)]
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#![feature(const_index_range_slice_index)]
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#![feature(const_int_from_str)]
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#![feature(const_intrinsic_copy)]
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#![feature(const_intrinsic_forget)]
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#![feature(const_ipv4)]
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#![feature(const_ipv6)]
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#![feature(const_likely)]
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#![feature(const_maybe_uninit_as_mut_ptr)]
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#![feature(const_maybe_uninit_assume_init)]
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#![feature(const_maybe_uninit_uninit_array)]
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#![feature(const_nonnull_new)]
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#![feature(const_num_midpoint)]
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#![feature(const_option)]
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#![feature(const_option_ext)]
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#![feature(const_pin)]
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#![feature(const_pointer_is_aligned)]
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#![feature(const_ptr_as_ref)]
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#![feature(const_ptr_is_null)]
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#![feature(const_ptr_sub_ptr)]
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#![feature(const_ptr_write)]
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#![feature(const_raw_ptr_comparison)]
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#![feature(const_replace)]
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#![feature(const_size_of_val)]
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#![feature(const_size_of_val_raw)]
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#![feature(const_slice_from_raw_parts_mut)]
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#![feature(const_slice_from_ref)]
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#![feature(const_slice_index)]
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#![feature(const_slice_split_at_mut)]
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#![feature(const_str_from_utf8_unchecked_mut)]
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#![feature(const_strict_overflow_ops)]
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#![feature(const_swap)]
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#![feature(const_try)]
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#![feature(const_type_id)]
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#![feature(const_type_name)]
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#![feature(const_typed_swap)]
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#![feature(const_ub_checks)]
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#![feature(const_unicode_case_lookup)]
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#![feature(const_unsafecell_get_mut)]
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#![feature(const_waker)]
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#![feature(coverage_attribute)]
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#![feature(duration_consts_float)]
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#![feature(internal_impls_macro)]
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#![feature(ip)]
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#![feature(ip_bits)]
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#![feature(is_ascii_octdigit)]
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#![feature(isqrt)]
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#![feature(link_cfg)]
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#![feature(maybe_uninit_uninit_array)]
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#![feature(offset_of_enum)]
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#![feature(offset_of_nested)]
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#![feature(panic_internals)]
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#![feature(ptr_alignment_type)]
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#![feature(ptr_metadata)]
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#![feature(set_ptr_value)]
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#![feature(slice_ptr_get)]
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#![feature(str_internals)]
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#![feature(str_split_inclusive_remainder)]
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#![feature(str_split_remainder)]
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#![feature(strict_provenance)]
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#![feature(ub_checks)]
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#![feature(unchecked_shifts)]
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#![feature(utf16_extra)]
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#![feature(utf16_extra_const)]
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#![feature(variant_count)]
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// tidy-alphabetical-end
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//
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// Language features:
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// tidy-alphabetical-start
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#![feature(abi_unadjusted)]
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#![feature(adt_const_params)]
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#![feature(allow_internal_unsafe)]
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#![feature(allow_internal_unstable)]
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#![feature(asm_const)]
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#![feature(auto_traits)]
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#![feature(c_unwind)]
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#![feature(cfg_sanitize)]
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#![feature(cfg_target_has_atomic)]
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#![feature(cfg_target_has_atomic_equal_alignment)]
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#![feature(const_closures)]
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#![feature(const_fn_floating_point_arithmetic)]
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#![feature(const_for)]
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#![feature(const_mut_refs)]
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#![feature(const_precise_live_drops)]
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#![feature(const_refs_to_cell)]
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#![feature(const_trait_impl)]
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#![feature(decl_macro)]
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#![feature(deprecated_suggestion)]
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#![feature(doc_cfg)]
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#![feature(doc_cfg_hide)]
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#![feature(doc_notable_trait)]
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#![feature(effects)]
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#![feature(extern_types)]
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#![feature(f128)]
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#![feature(f16)]
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#![feature(freeze_impls)]
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#![feature(fundamental)]
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#![feature(generic_arg_infer)]
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#![feature(if_let_guard)]
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#![feature(intra_doc_pointers)]
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#![feature(intrinsics)]
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#![feature(lang_items)]
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#![feature(let_chains)]
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#![feature(link_llvm_intrinsics)]
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#![feature(macro_metavar_expr)]
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#![feature(min_exhaustive_patterns)]
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#![feature(min_specialization)]
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#![feature(multiple_supertrait_upcastable)]
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#![feature(must_not_suspend)]
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#![feature(negative_impls)]
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#![feature(never_type)]
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#![feature(no_core)]
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#![feature(no_sanitize)]
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#![feature(prelude_import)]
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#![feature(repr_simd)]
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#![feature(rustc_allow_const_fn_unstable)]
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#![feature(rustc_attrs)]
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#![feature(rustdoc_internals)]
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#![feature(simd_ffi)]
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#![feature(staged_api)]
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#![feature(stmt_expr_attributes)]
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#![feature(target_feature_11)]
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#![feature(trait_alias)]
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#![feature(transparent_unions)]
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#![feature(try_blocks)]
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#![feature(unboxed_closures)]
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#![feature(unsized_fn_params)]
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#![feature(with_negative_coherence)]
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// tidy-alphabetical-end
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//
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// Target features:
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// tidy-alphabetical-start
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#![feature(arm_target_feature)]
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#![feature(avx512_target_feature)]
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#![feature(hexagon_target_feature)]
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#![feature(loongarch_target_feature)]
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#![feature(mips_target_feature)]
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#![feature(powerpc_target_feature)]
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#![feature(riscv_target_feature)]
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#![feature(rtm_target_feature)]
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#![feature(sse4a_target_feature)]
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#![feature(tbm_target_feature)]
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#![feature(wasm_target_feature)]
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// tidy-alphabetical-end
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// allow using `core::` in intra-doc links
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#[allow(unused_extern_crates)]
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extern crate self as core;
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#[prelude_import]
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#[allow(unused)]
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use prelude::rust_2021::*;
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#[cfg(not(test))] // See #65860
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#[macro_use]
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mod macros;
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// We don't export this through #[macro_export] for now, to avoid breakage.
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// See https://github.com/rust-lang/rust/issues/82913
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#[cfg(not(test))]
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#[unstable(feature = "assert_matches", issue = "82775")]
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/// Unstable module containing the unstable `assert_matches` macro.
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pub mod assert_matches {
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#[unstable(feature = "assert_matches", issue = "82775")]
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pub use crate::macros::{assert_matches, debug_assert_matches};
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}
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#[unstable(feature = "cfg_match", issue = "115585")]
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pub use crate::macros::cfg_match;
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#[macro_use]
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mod internal_macros;
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#[path = "num/shells/int_macros.rs"]
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#[macro_use]
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mod int_macros;
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#[rustc_diagnostic_item = "i128_legacy_mod"]
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#[path = "num/shells/i128.rs"]
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pub mod i128;
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#[rustc_diagnostic_item = "i16_legacy_mod"]
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#[path = "num/shells/i16.rs"]
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pub mod i16;
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#[rustc_diagnostic_item = "i32_legacy_mod"]
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#[path = "num/shells/i32.rs"]
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pub mod i32;
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#[rustc_diagnostic_item = "i64_legacy_mod"]
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#[path = "num/shells/i64.rs"]
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pub mod i64;
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#[rustc_diagnostic_item = "i8_legacy_mod"]
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#[path = "num/shells/i8.rs"]
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pub mod i8;
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#[rustc_diagnostic_item = "isize_legacy_mod"]
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#[path = "num/shells/isize.rs"]
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pub mod isize;
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#[rustc_diagnostic_item = "u128_legacy_mod"]
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#[path = "num/shells/u128.rs"]
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pub mod u128;
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#[rustc_diagnostic_item = "u16_legacy_mod"]
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#[path = "num/shells/u16.rs"]
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pub mod u16;
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#[rustc_diagnostic_item = "u32_legacy_mod"]
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#[path = "num/shells/u32.rs"]
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pub mod u32;
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#[rustc_diagnostic_item = "u64_legacy_mod"]
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#[path = "num/shells/u64.rs"]
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pub mod u64;
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#[rustc_diagnostic_item = "u8_legacy_mod"]
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#[path = "num/shells/u8.rs"]
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pub mod u8;
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#[rustc_diagnostic_item = "usize_legacy_mod"]
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#[path = "num/shells/usize.rs"]
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pub mod usize;
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#[path = "num/f128.rs"]
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pub mod f128;
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#[path = "num/f16.rs"]
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pub mod f16;
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#[path = "num/f32.rs"]
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pub mod f32;
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#[path = "num/f64.rs"]
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pub mod f64;
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#[macro_use]
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pub mod num;
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/* The core prelude, not as all-encompassing as the std prelude */
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pub mod prelude;
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/* Core modules for ownership management */
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pub mod hint;
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pub mod intrinsics;
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pub mod mem;
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pub mod ptr;
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#[unstable(feature = "ub_checks", issue = "none")]
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pub mod ub_checks;
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/* Core language traits */
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pub mod borrow;
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pub mod clone;
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pub mod cmp;
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pub mod convert;
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pub mod default;
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pub mod error;
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pub mod marker;
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pub mod ops;
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/* Core types and methods on primitives */
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pub mod any;
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pub mod array;
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pub mod ascii;
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pub mod asserting;
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#[unstable(feature = "async_iterator", issue = "79024")]
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pub mod async_iter;
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pub mod cell;
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pub mod char;
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pub mod ffi;
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#[unstable(feature = "core_io_borrowed_buf", issue = "117693")]
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pub mod io;
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pub mod iter;
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pub mod net;
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pub mod option;
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pub mod panic;
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pub mod panicking;
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#[unstable(feature = "core_pattern_types", issue = "none")]
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pub mod pat;
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pub mod pin;
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pub mod result;
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pub mod sync;
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pub mod fmt;
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pub mod hash;
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pub mod slice;
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pub mod str;
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pub mod time;
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pub mod unicode;
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/* Async */
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pub mod future;
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pub mod task;
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/* Heap memory allocator trait */
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#[allow(missing_docs)]
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pub mod alloc;
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// note: does not need to be public
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mod bool;
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mod escape;
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mod tuple;
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mod unit;
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#[stable(feature = "core_primitive", since = "1.43.0")]
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pub mod primitive;
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// Pull in the `core_arch` crate directly into core. The contents of
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// `core_arch` are in a different repository: rust-lang/stdarch.
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//
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// `core_arch` depends on core, but the contents of this module are
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// set up in such a way that directly pulling it here works such that the
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// crate uses the this crate as its core.
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#[path = "../../stdarch/crates/core_arch/src/mod.rs"]
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#[allow(
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missing_docs,
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missing_debug_implementations,
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dead_code,
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unused_imports,
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unsafe_op_in_unsafe_fn,
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ambiguous_glob_reexports,
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deprecated_in_future
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)]
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#[allow(rustdoc::bare_urls)]
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mod core_arch;
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#[stable(feature = "simd_arch", since = "1.27.0")]
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pub mod arch;
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// Pull in the `core_simd` crate directly into core. The contents of
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// `core_simd` are in a different repository: rust-lang/portable-simd.
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//
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// `core_simd` depends on core, but the contents of this module are
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// set up in such a way that directly pulling it here works such that the
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// crate uses this crate as its core.
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#[path = "../../portable-simd/crates/core_simd/src/mod.rs"]
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#[allow(missing_debug_implementations, dead_code, unsafe_op_in_unsafe_fn)]
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#[allow(rustdoc::bare_urls)]
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#[unstable(feature = "portable_simd", issue = "86656")]
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mod core_simd;
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#[unstable(feature = "portable_simd", issue = "86656")]
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pub mod simd {
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#![doc = include_str!("../../portable-simd/crates/core_simd/src/core_simd_docs.md")]
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#[unstable(feature = "portable_simd", issue = "86656")]
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pub use crate::core_simd::simd::*;
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}
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include!("primitive_docs.rs");
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