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Diffstat (limited to 'third_party/rust/lazy_static')
| -rw-r--r-- | third_party/rust/lazy_static/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/Cargo.toml | 46 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/LICENSE-MIT | 25 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/README.md | 79 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/src/core_lazy.rs | 31 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/src/inline_lazy.rs | 57 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/src/lib.rs | 215 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/tests/no_std.rs | 20 | ||||
| -rw-r--r-- | third_party/rust/lazy_static/tests/test.rs | 164 |
10 files changed, 839 insertions, 0 deletions
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\ No newline at end of file diff --git a/third_party/rust/lazy_static/Cargo.toml b/third_party/rust/lazy_static/Cargo.toml new file mode 100644 index 0000000000..7f930c5e3d --- /dev/null +++ b/third_party/rust/lazy_static/Cargo.toml @@ -0,0 +1,46 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies +# +# If you believe there's an error in this file please file an +# issue against the rust-lang/cargo repository. If you're +# editing this file be aware that the upstream Cargo.toml +# will likely look very different (and much more reasonable) + +[package] +name = "lazy_static" +version = "1.4.0" +authors = ["Marvin Löbel <loebel.marvin@gmail.com>"] +exclude = ["/.travis.yml", "/appveyor.yml"] +description = "A macro for declaring lazily evaluated statics in Rust." +documentation = "https://docs.rs/lazy_static" +readme = "README.md" +keywords = ["macro", "lazy", "static"] +categories = ["no-std", "rust-patterns", "memory-management"] +license = "MIT/Apache-2.0" +repository = "https://github.com/rust-lang-nursery/lazy-static.rs" +[dependencies.spin] +version = "0.5.0" +optional = true +[dev-dependencies.doc-comment] +version = "0.3.1" + +[features] +spin_no_std = ["spin"] +[badges.appveyor] +repository = "rust-lang-nursery/lazy-static.rs" + +[badges.is-it-maintained-issue-resolution] +repository = "rust-lang-nursery/lazy-static.rs" + +[badges.is-it-maintained-open-issues] +repository = "rust-lang-nursery/lazy-static.rs" + +[badges.maintenance] +status = "passively-maintained" + +[badges.travis-ci] +repository = "rust-lang-nursery/lazy-static.rs" diff --git a/third_party/rust/lazy_static/LICENSE-APACHE b/third_party/rust/lazy_static/LICENSE-APACHE new file mode 100644 index 0000000000..16fe87b06e --- /dev/null +++ b/third_party/rust/lazy_static/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/third_party/rust/lazy_static/README.md b/third_party/rust/lazy_static/README.md new file mode 100644 index 0000000000..aa9f828324 --- /dev/null +++ b/third_party/rust/lazy_static/README.md @@ -0,0 +1,79 @@ +lazy-static.rs +============== + +A macro for declaring lazily evaluated statics in Rust. + +Using this macro, it is possible to have `static`s that require code to be +executed at runtime in order to be initialized. +This includes anything requiring heap allocations, like vectors or hash maps, +as well as anything that requires non-const function calls to be computed. + +[](https://travis-ci.com/rust-lang-nursery/lazy-static.rs) +[](https://crates.io/crates/lazy_static) +[](https://docs.rs/lazy_static) +[](https://github.com/rust-lang-nursery/lazy-static.rs#license) + +## Minimum supported `rustc` + +`1.27.2+` + +This version is explicitly tested in CI and may only be bumped in new minor versions. Any changes to the supported minimum version will be called out in the release notes. + + +# Getting Started + +[lazy-static.rs is available on crates.io](https://crates.io/crates/lazy_static). +It is recommended to look there for the newest released version, as well as links to the newest builds of the docs. + +At the point of the last update of this README, the latest published version could be used like this: + +Add the following dependency to your Cargo manifest... + +```toml +[dependencies] +lazy_static = "1.4.0" +``` + +...and see the [docs](https://docs.rs/lazy_static) for how to use it. + +# Example + +```rust +#[macro_use] +extern crate lazy_static; + +use std::collections::HashMap; + +lazy_static! { + static ref HASHMAP: HashMap<u32, &'static str> = { + let mut m = HashMap::new(); + m.insert(0, "foo"); + m.insert(1, "bar"); + m.insert(2, "baz"); + m + }; +} + +fn main() { + // First access to `HASHMAP` initializes it + println!("The entry for `0` is \"{}\".", HASHMAP.get(&0).unwrap()); + + // Any further access to `HASHMAP` just returns the computed value + println!("The entry for `1` is \"{}\".", HASHMAP.get(&1).unwrap()); +} +``` + +## License + +Licensed under either of + + * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) + +at your option. + +### Contribution + +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any +additional terms or conditions. diff --git a/third_party/rust/lazy_static/src/core_lazy.rs b/third_party/rust/lazy_static/src/core_lazy.rs new file mode 100644 index 0000000000..b66c3e0d02 --- /dev/null +++ b/third_party/rust/lazy_static/src/core_lazy.rs @@ -0,0 +1,31 @@ +// Copyright 2016 lazy-static.rs Developers +// +// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or +// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or +// http://opensource.org/licenses/MIT>, at your option. This file may not be +// copied, modified, or distributed except according to those terms. + +extern crate spin; + +use self::spin::Once; + +pub struct Lazy<T: Sync>(Once<T>); + +impl<T: Sync> Lazy<T> { + pub const INIT: Self = Lazy(Once::INIT); + + #[inline(always)] + pub fn get<F>(&'static self, builder: F) -> &T + where F: FnOnce() -> T + { + self.0.call_once(builder) + } +} + +#[macro_export] +#[doc(hidden)] +macro_rules! __lazy_static_create { + ($NAME:ident, $T:ty) => { + static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT; + } +} diff --git a/third_party/rust/lazy_static/src/inline_lazy.rs b/third_party/rust/lazy_static/src/inline_lazy.rs new file mode 100644 index 0000000000..219ce9c60c --- /dev/null +++ b/third_party/rust/lazy_static/src/inline_lazy.rs @@ -0,0 +1,57 @@ +// Copyright 2016 lazy-static.rs Developers +// +// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or +// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or +// http://opensource.org/licenses/MIT>, at your option. This file may not be +// copied, modified, or distributed except according to those terms. + +extern crate core; +extern crate std; + +use self::std::prelude::v1::*; +use self::std::cell::Cell; +use self::std::hint::unreachable_unchecked; +use self::std::sync::Once; +#[allow(deprecated)] +pub use self::std::sync::ONCE_INIT; + +// FIXME: Replace Option<T> with MaybeUninit<T> (stable since 1.36.0) +pub struct Lazy<T: Sync>(Cell<Option<T>>, Once); + +impl<T: Sync> Lazy<T> { + #[allow(deprecated)] + pub const INIT: Self = Lazy(Cell::new(None), ONCE_INIT); + + #[inline(always)] + pub fn get<F>(&'static self, f: F) -> &T + where + F: FnOnce() -> T, + { + self.1.call_once(|| { + self.0.set(Some(f())); + }); + + // `self.0` is guaranteed to be `Some` by this point + // The `Once` will catch and propagate panics + unsafe { + match *self.0.as_ptr() { + Some(ref x) => x, + None => { + debug_assert!(false, "attempted to derefence an uninitialized lazy static. This is a bug"); + + unreachable_unchecked() + }, + } + } + } +} + +unsafe impl<T: Sync> Sync for Lazy<T> {} + +#[macro_export] +#[doc(hidden)] +macro_rules! __lazy_static_create { + ($NAME:ident, $T:ty) => { + static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT; + }; +} diff --git a/third_party/rust/lazy_static/src/lib.rs b/third_party/rust/lazy_static/src/lib.rs new file mode 100644 index 0000000000..cada0dc681 --- /dev/null +++ b/third_party/rust/lazy_static/src/lib.rs @@ -0,0 +1,215 @@ +// Copyright 2016 lazy-static.rs Developers +// +// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or +// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or +// http://opensource.org/licenses/MIT>, at your option. This file may not be +// copied, modified, or distributed except according to those terms. + +/*! +A macro for declaring lazily evaluated statics. + +Using this macro, it is possible to have `static`s that require code to be +executed at runtime in order to be initialized. +This includes anything requiring heap allocations, like vectors or hash maps, +as well as anything that requires function calls to be computed. + +# Syntax + +```ignore +lazy_static! { + [pub] static ref NAME_1: TYPE_1 = EXPR_1; + [pub] static ref NAME_2: TYPE_2 = EXPR_2; + ... + [pub] static ref NAME_N: TYPE_N = EXPR_N; +} +``` + +Attributes (including doc comments) are supported as well: + +```rust +# #[macro_use] +# extern crate lazy_static; +# fn main() { +lazy_static! { + /// This is an example for using doc comment attributes + static ref EXAMPLE: u8 = 42; +} +# } +``` + +# Semantics + +For a given `static ref NAME: TYPE = EXPR;`, the macro generates a unique type that +implements `Deref<TYPE>` and stores it in a static with name `NAME`. (Attributes end up +attaching to this type.) + +On first deref, `EXPR` gets evaluated and stored internally, such that all further derefs +can return a reference to the same object. Note that this can lead to deadlocks +if you have multiple lazy statics that depend on each other in their initialization. + +Apart from the lazy initialization, the resulting "static ref" variables +have generally the same properties as regular "static" variables: + +- Any type in them needs to fulfill the `Sync` trait. +- If the type has a destructor, then it will not run when the process exits. + +# Example + +Using the macro: + +```rust +#[macro_use] +extern crate lazy_static; + +use std::collections::HashMap; + +lazy_static! { + static ref HASHMAP: HashMap<u32, &'static str> = { + let mut m = HashMap::new(); + m.insert(0, "foo"); + m.insert(1, "bar"); + m.insert(2, "baz"); + m + }; + static ref COUNT: usize = HASHMAP.len(); + static ref NUMBER: u32 = times_two(21); +} + +fn times_two(n: u32) -> u32 { n * 2 } + +fn main() { + println!("The map has {} entries.", *COUNT); + println!("The entry for `0` is \"{}\".", HASHMAP.get(&0).unwrap()); + println!("A expensive calculation on a static results in: {}.", *NUMBER); +} +``` + +# Implementation details + +The `Deref` implementation uses a hidden static variable that is guarded by an atomic check on each access. + +# Cargo features + +This crate provides one cargo feature: + +- `spin_no_std`: This allows using this crate in a no-std environment, by depending on the standalone `spin` crate. + +*/ + +#![doc(html_root_url = "https://docs.rs/lazy_static/1.4.0")] +#![no_std] + +#[cfg(not(feature = "spin_no_std"))] +#[path="inline_lazy.rs"] +#[doc(hidden)] +pub mod lazy; + +#[cfg(test)] +#[macro_use] +extern crate doc_comment; + +#[cfg(test)] +doctest!("../README.md"); + +#[cfg(feature = "spin_no_std")] +#[path="core_lazy.rs"] +#[doc(hidden)] +pub mod lazy; + +#[doc(hidden)] +pub use core::ops::Deref as __Deref; + +#[macro_export(local_inner_macros)] +#[doc(hidden)] +macro_rules! __lazy_static_internal { + // optional visibility restrictions are wrapped in `()` to allow for + // explicitly passing otherwise implicit information about private items + ($(#[$attr:meta])* ($($vis:tt)*) static ref $N:ident : $T:ty = $e:expr; $($t:tt)*) => { + __lazy_static_internal!(@MAKE TY, $(#[$attr])*, ($($vis)*), $N); + __lazy_static_internal!(@TAIL, $N : $T = $e); + lazy_static!($($t)*); + }; + (@TAIL, $N:ident : $T:ty = $e:expr) => { + impl $crate::__Deref for $N { + type Target = $T; + fn deref(&self) -> &$T { + #[inline(always)] + fn __static_ref_initialize() -> $T { $e } + + #[inline(always)] + fn __stability() -> &'static $T { + __lazy_static_create!(LAZY, $T); + LAZY.get(__static_ref_initialize) + } + __stability() + } + } + impl $crate::LazyStatic for $N { + fn initialize(lazy: &Self) { + let _ = &**lazy; + } + } + }; + // `vis` is wrapped in `()` to prevent parsing ambiguity + (@MAKE TY, $(#[$attr:meta])*, ($($vis:tt)*), $N:ident) => { + #[allow(missing_copy_implementations)] + #[allow(non_camel_case_types)] + #[allow(dead_code)] + $(#[$attr])* + $($vis)* struct $N {__private_field: ()} + #[doc(hidden)] + $($vis)* static $N: $N = $N {__private_field: ()}; + }; + () => () +} + +#[macro_export(local_inner_macros)] +macro_rules! lazy_static { + ($(#[$attr:meta])* static ref $N:ident : $T:ty = $e:expr; $($t:tt)*) => { + // use `()` to explicitly forward the information about private items + __lazy_static_internal!($(#[$attr])* () static ref $N : $T = $e; $($t)*); + }; + ($(#[$attr:meta])* pub static ref $N:ident : $T:ty = $e:expr; $($t:tt)*) => { + __lazy_static_internal!($(#[$attr])* (pub) static ref $N : $T = $e; $($t)*); + }; + ($(#[$attr:meta])* pub ($($vis:tt)+) static ref $N:ident : $T:ty = $e:expr; $($t:tt)*) => { + __lazy_static_internal!($(#[$attr])* (pub ($($vis)+)) static ref $N : $T = $e; $($t)*); + }; + () => () +} + +/// Support trait for enabling a few common operation on lazy static values. +/// +/// This is implemented by each defined lazy static, and +/// used by the free functions in this crate. +pub trait LazyStatic { + #[doc(hidden)] + fn initialize(lazy: &Self); +} + +/// Takes a shared reference to a lazy static and initializes +/// it if it has not been already. +/// +/// This can be used to control the initialization point of a lazy static. +/// +/// Example: +/// +/// ```rust +/// #[macro_use] +/// extern crate lazy_static; +/// +/// lazy_static! { +/// static ref BUFFER: Vec<u8> = (0..255).collect(); +/// } +/// +/// fn main() { +/// lazy_static::initialize(&BUFFER); +/// +/// // ... +/// work_with_initialized_data(&BUFFER); +/// } +/// # fn work_with_initialized_data(_: &[u8]) {} +/// ``` +pub fn initialize<T: LazyStatic>(lazy: &T) { + LazyStatic::initialize(lazy); +} diff --git a/third_party/rust/lazy_static/tests/no_std.rs b/third_party/rust/lazy_static/tests/no_std.rs new file mode 100644 index 0000000000..f94a1aaa6d --- /dev/null +++ b/third_party/rust/lazy_static/tests/no_std.rs @@ -0,0 +1,20 @@ +#![cfg(feature="spin_no_std")] + +#![no_std] + +#[macro_use] +extern crate lazy_static; + +lazy_static! { + /// Documentation! + pub static ref NUMBER: u32 = times_two(3); +} + +fn times_two(n: u32) -> u32 { + n * 2 +} + +#[test] +fn test_basic() { + assert_eq!(*NUMBER, 6); +} diff --git a/third_party/rust/lazy_static/tests/test.rs b/third_party/rust/lazy_static/tests/test.rs new file mode 100644 index 0000000000..03d0ab683a --- /dev/null +++ b/third_party/rust/lazy_static/tests/test.rs @@ -0,0 +1,164 @@ +#[macro_use] +extern crate lazy_static; +use std::collections::HashMap; + +lazy_static! { + /// Documentation! + pub static ref NUMBER: u32 = times_two(3); + + static ref ARRAY_BOXES: [Box<u32>; 3] = [Box::new(1), Box::new(2), Box::new(3)]; + + /// More documentation! + #[allow(unused_variables)] + #[derive(Copy, Clone, Debug)] + pub static ref STRING: String = "hello".to_string(); + + static ref HASHMAP: HashMap<u32, &'static str> = { + let mut m = HashMap::new(); + m.insert(0, "abc"); + m.insert(1, "def"); + m.insert(2, "ghi"); + m + }; + + // This should not compile if the unsafe is removed. + static ref UNSAFE: u32 = unsafe { + std::mem::transmute::<i32, u32>(-1) + }; +} + +lazy_static! { + static ref S1: &'static str = "a"; + static ref S2: &'static str = "b"; +} +lazy_static! { + static ref S3: String = [*S1, *S2].join(""); +} + +#[test] +fn s3() { + assert_eq!(&*S3, "ab"); +} + +fn times_two(n: u32) -> u32 { + n * 2 +} + +#[test] +fn test_basic() { + assert_eq!(&**STRING, "hello"); + assert_eq!(*NUMBER, 6); + assert!(HASHMAP.get(&1).is_some()); + assert!(HASHMAP.get(&3).is_none()); + assert_eq!(&*ARRAY_BOXES, &[Box::new(1), Box::new(2), Box::new(3)]); + assert_eq!(*UNSAFE, std::u32::MAX); +} + +#[test] +fn test_repeat() { + assert_eq!(*NUMBER, 6); + assert_eq!(*NUMBER, 6); + assert_eq!(*NUMBER, 6); +} + +#[test] +fn test_meta() { + // this would not compile if STRING were not marked #[derive(Copy, Clone)] + let copy_of_string = STRING; + // just to make sure it was copied + assert!(&STRING as *const _ != ©_of_string as *const _); + + // this would not compile if STRING were not marked #[derive(Debug)] + assert_eq!(format!("{:?}", STRING), "STRING { __private_field: () }".to_string()); +} + +mod visibility { + lazy_static! { + pub static ref FOO: Box<u32> = Box::new(0); + static ref BAR: Box<u32> = Box::new(98); + } + + pub mod inner { + lazy_static! { + pub(in visibility) static ref BAZ: Box<u32> = Box::new(42); + pub(crate) static ref BAG: Box<u32> = Box::new(37); + } + } + + #[test] + fn sub_test() { + assert_eq!(**FOO, 0); + assert_eq!(**BAR, 98); + assert_eq!(**inner::BAZ, 42); + assert_eq!(**inner::BAG, 37); + } +} + +#[test] +fn test_visibility() { + assert_eq!(*visibility::FOO, Box::new(0)); + assert_eq!(*visibility::inner::BAG, Box::new(37)); +} + +// This should not cause a warning about a missing Copy implementation +lazy_static! { + pub static ref VAR: i32 = { 0 }; +} + +#[derive(Copy, Clone, Debug, PartialEq)] +struct X; +struct Once(X); +const ONCE_INIT: Once = Once(X); +static DATA: X = X; +static ONCE: X = X; +fn require_sync() -> X { X } +fn transmute() -> X { X } +fn __static_ref_initialize() -> X { X } +fn test(_: Vec<X>) -> X { X } + +// All these names should not be shadowed +lazy_static! { + static ref ITEM_NAME_TEST: X = { + test(vec![X, Once(X).0, ONCE_INIT.0, DATA, ONCE, + require_sync(), transmute(), + // Except this, which will sadly be shadowed by internals: + // __static_ref_initialize() + ]) + }; +} + +#[test] +fn item_name_shadowing() { + assert_eq!(*ITEM_NAME_TEST, X); +} + +use std::sync::atomic::AtomicBool; +#[allow(deprecated)] +use std::sync::atomic::ATOMIC_BOOL_INIT; +use std::sync::atomic::Ordering::SeqCst; + +#[allow(deprecated)] +static PRE_INIT_FLAG: AtomicBool = ATOMIC_BOOL_INIT; + +lazy_static! { + static ref PRE_INIT: () = { + PRE_INIT_FLAG.store(true, SeqCst); + () + }; +} + +#[test] +fn pre_init() { + assert_eq!(PRE_INIT_FLAG.load(SeqCst), false); + lazy_static::initialize(&PRE_INIT); + assert_eq!(PRE_INIT_FLAG.load(SeqCst), true); +} + +lazy_static! { + static ref LIFETIME_NAME: for<'a> fn(&'a u8) = { fn f(_: &u8) {} f }; +} + +#[test] +fn lifetime_name() { + let _ = LIFETIME_NAME; +} |