b4877edd67
This commit is an initial start at implementing the standard library for wasm32-unknown-unknown with the experimental `atomics` feature enabled. None of these changes will be visible to users of the wasm32-unknown-unknown target because they all require recompiling the standard library. The hope with this is that we can get this support into the standard library and start iterating on it in-tree to enable experimentation. Currently there's a few components in this PR: * Atomic fences are disabled on wasm as there's no corresponding atomic op and it's not clear yet what the convention should be, but this will change in the future! * Implementations of `Mutex`, `Condvar`, and `RwLock` were all added based on the atomic intrinsics that wasm has. * The `ReentrantMutex` and thread-local-storage implementations panic currently as there's no great way to get a handle on the current thread's "id" yet. Right now the wasm32 target with atomics is unfortunately pretty unusable, requiring a lot of manual things here and there to actually get it operational. This will likely continue to evolve as the story for atomics and wasm unfolds, but we also need more LLVM support for some operations like custom `global` directives for this to work best.
259 lines
8.1 KiB
Rust
259 lines
8.1 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! # 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`, `memcmp`, `memset` - These are core memory routines which are
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//! often generated by LLVM. Additionally, this library can make explicit
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//! calls to these functions. Their signatures are the same as found in C.
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//! These functions are often provided by the system libc, but can also be
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//! provided by the [rlibc crate](https://crates.io/crates/rlibc).
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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 libcore defines many fundamental lang items, all tests live in a
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// separate crate, libcoretest, 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 libcore) will both define the same set of lang items,
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// and this will cause the E0152 "duplicate lang item found" 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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#![stable(feature = "core", since = "1.6.0")]
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#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
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html_root_url = "https://doc.rust-lang.org/nightly/",
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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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#![no_core]
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#![deny(missing_docs)]
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#![deny(missing_debug_implementations)]
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#![feature(allow_internal_unstable)]
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#![feature(arbitrary_self_types)]
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#![feature(asm)]
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#![feature(associated_type_defaults)]
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#![feature(cfg_target_has_atomic)]
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#![feature(concat_idents)]
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#![feature(const_fn)]
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#![feature(const_int_ops)]
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#![feature(const_fn_union)]
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#![feature(custom_attribute)]
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#![feature(doc_cfg)]
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#![feature(doc_spotlight)]
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#![feature(extern_types)]
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#![feature(fundamental)]
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#![feature(intrinsics)]
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#![feature(lang_items)]
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#![feature(link_llvm_intrinsics)]
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#![feature(never_type)]
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#![cfg_attr(not(stage0), feature(nll))]
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#![feature(exhaustive_patterns)]
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#![feature(macro_at_most_once_rep)]
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#![feature(no_core)]
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#![feature(on_unimplemented)]
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#![feature(optin_builtin_traits)]
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#![feature(prelude_import)]
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#![feature(repr_simd, platform_intrinsics)]
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#![feature(rustc_attrs)]
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#![feature(rustc_const_unstable)]
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#![feature(simd_ffi)]
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#![feature(specialization)]
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#![feature(staged_api)]
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#![feature(stmt_expr_attributes)]
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#![feature(unboxed_closures)]
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#![feature(untagged_unions)]
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#![feature(unwind_attributes)]
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#![feature(doc_alias)]
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#![feature(mmx_target_feature)]
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#![feature(tbm_target_feature)]
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#![feature(sse4a_target_feature)]
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#![feature(arm_target_feature)]
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#![feature(powerpc_target_feature)]
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#![feature(mips_target_feature)]
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#![feature(aarch64_target_feature)]
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#![feature(wasm_target_feature)]
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#![feature(const_slice_len)]
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#![feature(const_str_as_bytes)]
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#![feature(const_str_len)]
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#![feature(const_let)]
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#![feature(const_int_rotate)]
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#![feature(const_int_wrapping)]
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#![feature(const_int_sign)]
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#![feature(const_int_conversion)]
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#![feature(const_transmute)]
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#![feature(reverse_bits)]
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#![feature(non_exhaustive)]
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#[prelude_import]
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#[allow(unused)]
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use prelude::v1::*;
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#[macro_use]
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mod macros;
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#[macro_use]
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mod internal_macros;
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#[path = "num/int_macros.rs"]
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#[macro_use]
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mod int_macros;
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#[path = "num/uint_macros.rs"]
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#[macro_use]
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mod uint_macros;
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#[path = "num/isize.rs"] pub mod isize;
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#[path = "num/i8.rs"] pub mod i8;
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#[path = "num/i16.rs"] pub mod i16;
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#[path = "num/i32.rs"] pub mod i32;
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#[path = "num/i64.rs"] pub mod i64;
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#[path = "num/i128.rs"] pub mod i128;
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#[path = "num/usize.rs"] pub mod usize;
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#[path = "num/u8.rs"] pub mod u8;
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#[path = "num/u16.rs"] pub mod u16;
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#[path = "num/u32.rs"] pub mod u32;
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#[path = "num/u64.rs"] pub mod u64;
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#[path = "num/u128.rs"] pub mod u128;
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#[path = "num/f32.rs"] pub mod f32;
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#[path = "num/f64.rs"] pub mod f64;
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#[macro_use]
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pub mod num;
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/* The libcore prelude, not as all-encompassing as the libstd prelude */
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pub mod prelude;
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/* Core modules for ownership management */
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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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pub mod hint;
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/* Core language traits */
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pub mod marker;
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pub mod ops;
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pub mod cmp;
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pub mod clone;
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pub mod default;
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pub mod convert;
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pub mod borrow;
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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 sync;
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pub mod cell;
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pub mod char;
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pub mod panic;
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pub mod panicking;
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pub mod pin;
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pub mod iter;
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pub mod option;
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pub mod raw;
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pub mod result;
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pub mod ffi;
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pub mod slice;
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pub mod str;
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pub mod hash;
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pub mod fmt;
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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 iter_private;
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mod nonzero;
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mod tuple;
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mod unit;
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// Pull in the the `coresimd` crate directly into libcore. This is where all the
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// architecture-specific (and vendor-specific) intrinsics are defined. AKA
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// things like SIMD and such. Note that the actual source for all this lies in a
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// different repository, rust-lang-nursery/stdsimd. That's why the setup here is
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// a bit wonky.
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#[allow(unused_macros)]
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macro_rules! test_v16 { ($item:item) => {}; }
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#[allow(unused_macros)]
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macro_rules! test_v32 { ($item:item) => {}; }
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#[allow(unused_macros)]
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macro_rules! test_v64 { ($item:item) => {}; }
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#[allow(unused_macros)]
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macro_rules! test_v128 { ($item:item) => {}; }
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#[allow(unused_macros)]
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macro_rules! test_v256 { ($item:item) => {}; }
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#[allow(unused_macros)]
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macro_rules! test_v512 { ($item:item) => {}; }
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#[allow(unused_macros)]
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macro_rules! vector_impl { ($([$f:ident, $($args:tt)*]),*) => { $($f!($($args)*);)* } }
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#[path = "../stdsimd/coresimd/mod.rs"]
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// replacing uses of mem::{uninitialized,zeroed} with MaybeUninit needs to be in the stdsimd repo
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#[allow(deprecated)]
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#[allow(missing_docs, missing_debug_implementations, dead_code, unused_imports)]
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#[unstable(feature = "stdsimd", issue = "48556")]
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#[cfg(not(stage0))] // allow changes to how stdsimd works in stage0
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mod coresimd;
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#[stable(feature = "simd_arch", since = "1.27.0")]
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#[cfg(not(stage0))]
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pub use coresimd::arch;
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