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-rw-r--r--third_party/rust/fastrand/.cargo-checksum.json1
-rw-r--r--third_party/rust/fastrand/CHANGELOG.md86
-rw-r--r--third_party/rust/fastrand/Cargo.toml53
-rw-r--r--third_party/rust/fastrand/LICENSE-APACHE201
-rw-r--r--third_party/rust/fastrand/LICENSE-MIT23
-rw-r--r--third_party/rust/fastrand/README.md92
-rw-r--r--third_party/rust/fastrand/benches/bench.rs98
-rw-r--r--third_party/rust/fastrand/src/lib.rs706
-rw-r--r--third_party/rust/fastrand/tests/char.rs44
-rw-r--r--third_party/rust/fastrand/tests/smoke.rs120
10 files changed, 1424 insertions, 0 deletions
diff --git a/third_party/rust/fastrand/.cargo-checksum.json b/third_party/rust/fastrand/.cargo-checksum.json
new file mode 100644
index 0000000000..17c4515ea0
--- /dev/null
+++ b/third_party/rust/fastrand/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"CHANGELOG.md":"64192695962b6d2ec5f1f57f3b7909c216611a5de5cd5d0d28d863477eef0a12","Cargo.toml":"9d3bf85fff7d7228a8aae6e0c20a43f19a846412e598ee0b7d1f6f2a30bac880","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"dec6b96d3549746937d7e0e62e35e206e6f5b7e2d1886451281905f4edf096d4","benches/bench.rs":"234b2e5f725102ed0ff7686def089de23e433eeecaf03542af31fc60725e85e3","src/lib.rs":"88bf8a952c723b28b989c7b998b2ec0de6a1351f6891088d6237300c8982f36d","tests/char.rs":"a530b41837f5bf43701d983ef0267d9b44779d455f24cbf30b881cd348de9ee1","tests/smoke.rs":"aac00322cce06f15378aacbf247a37e9602c46cfd2bd588a0887b266cbc4770a"},"package":"e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"} \ No newline at end of file
diff --git a/third_party/rust/fastrand/CHANGELOG.md b/third_party/rust/fastrand/CHANGELOG.md
new file mode 100644
index 0000000000..869f3148f6
--- /dev/null
+++ b/third_party/rust/fastrand/CHANGELOG.md
@@ -0,0 +1,86 @@
+# Version 1.9.0
+
+- Add `Rng::fill()` (#35, #43)
+- Add `#[must_use]` to `Rng::with_seed()` (#46)
+
+# Version 1.8.0
+
+- Add `get_seed()` and `Rng::get_seed()` (#33)
+
+# Version 1.7.0
+
+- Add `char()` and `Rng::char()` (#25)
+
+# Version 1.6.0
+
+- Implement `PartialEq` and `Eq` for `Rng` (#23)
+
+# Version 1.5.0
+
+- Switch to Wyrand (#14)
+
+# Version 1.4.1
+
+- Fix bug when generating a signed integer within a range (#16)
+
+# Version 1.4.0
+
+- Add wasm support.
+
+# Version 1.3.5
+
+- Reword docs.
+- Add `Rng::with_seed()`.
+
+# Version 1.3.4
+
+- Implement `Clone` for `Rng`.
+
+# Version 1.3.3
+
+- Forbid unsafe code.
+
+# Version 1.3.2
+
+- Support older Rust versions.
+
+# Version 1.3.1
+
+- Tweak Cargo keywords.
+
+# Version 1.3.0
+
+- Add `f32()` and `f64()`.
+- Add `lowercase()`, `uppercase()`, `alphabetic()`, and `digit()`.
+
+# Version 1.2.4
+
+- Switch to PCG XSH RR 64/32.
+- Fix a bug in `gen_mod_u128`.
+- Fix bias in ranges.
+
+# Version 1.2.3
+
+- Support Rust 1.32.0
+
+# Version 1.2.2
+
+- Use `std::$t::MAX` rather than `$t::MAX` to support older Rust versions.
+
+# Version 1.2.1
+
+- Inline all functions.
+
+# Version 1.2.0
+
+- Add `Rng` struct.
+
+# Version 1.1.0
+
+- Switch to PCG implementation.
+- Add `alphanumeric()`.
+- Add `seed()`.
+
+# Version 1.0.0
+
+- Initial version
diff --git a/third_party/rust/fastrand/Cargo.toml b/third_party/rust/fastrand/Cargo.toml
new file mode 100644
index 0000000000..7cc602f171
--- /dev/null
+++ b/third_party/rust/fastrand/Cargo.toml
@@ -0,0 +1,53 @@
+# 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 are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.34"
+name = "fastrand"
+version = "1.9.0"
+authors = ["Stjepan Glavina <stjepang@gmail.com>"]
+exclude = ["/.*"]
+description = "A simple and fast random number generator"
+readme = "README.md"
+keywords = [
+ "simple",
+ "fast",
+ "rand",
+ "random",
+ "wyrand",
+]
+categories = ["algorithms"]
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/smol-rs/fastrand"
+
+[dev-dependencies.getrandom]
+version = "0.2"
+
+[dev-dependencies.rand]
+version = "0.8"
+
+[dev-dependencies.wyhash]
+version = "0.5"
+
+[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dependencies.instant]
+version = "0.1"
+
+[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dev-dependencies.getrandom]
+version = "0.2"
+features = ["js"]
+
+[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dev-dependencies.instant]
+version = "0.1"
+features = ["wasm-bindgen"]
+
+[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dev-dependencies.wasm-bindgen-test]
+version = "0.3"
diff --git a/third_party/rust/fastrand/LICENSE-APACHE b/third_party/rust/fastrand/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/third_party/rust/fastrand/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. Definitions.
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+ whether in tort (including negligence), contract, or otherwise,
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diff --git a/third_party/rust/fastrand/LICENSE-MIT b/third_party/rust/fastrand/LICENSE-MIT
new file mode 100644
index 0000000000..31aa79387f
--- /dev/null
+++ b/third_party/rust/fastrand/LICENSE-MIT
@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. 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/fastrand/README.md b/third_party/rust/fastrand/README.md
new file mode 100644
index 0000000000..0da0612ea4
--- /dev/null
+++ b/third_party/rust/fastrand/README.md
@@ -0,0 +1,92 @@
+# fastrand
+
+[![Build](https://github.com/smol-rs/fastrand/workflows/Build%20and%20test/badge.svg)](
+https://github.com/smol-rs/fastrand/actions)
+[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](
+https://github.com/smol-rs/fastrand)
+[![Cargo](https://img.shields.io/crates/v/fastrand.svg)](
+https://crates.io/crates/fastrand)
+[![Documentation](https://docs.rs/fastrand/badge.svg)](
+https://docs.rs/fastrand)
+
+A simple and fast random number generator.
+
+The implementation uses [Wyrand](https://github.com/wangyi-fudan/wyhash), a simple and fast
+generator but **not** cryptographically secure.
+
+## Examples
+
+Flip a coin:
+
+```rust
+if fastrand::bool() {
+ println!("heads");
+} else {
+ println!("tails");
+}
+```
+
+Generate a random `i32`:
+
+```rust
+let num = fastrand::i32(..);
+```
+
+Choose a random element in an array:
+
+```rust
+let v = vec![1, 2, 3, 4, 5];
+let i = fastrand::usize(..v.len());
+let elem = v[i];
+```
+
+Shuffle an array:
+
+```rust
+let mut v = vec![1, 2, 3, 4, 5];
+fastrand::shuffle(&mut v);
+```
+
+Generate a random `Vec` or `String`:
+
+```rust
+use std::iter::repeat_with;
+
+let v: Vec<i32> = repeat_with(|| fastrand::i32(..)).take(10).collect();
+let s: String = repeat_with(fastrand::alphanumeric).take(10).collect();
+```
+
+To get reproducible results on every run, initialize the generator with a seed:
+
+```rust
+// Pick an arbitrary number as seed.
+fastrand::seed(7);
+
+// Now this prints the same number on every run:
+println!("{}", fastrand::u32(..));
+```
+
+To be more efficient, create a new `Rng` instance instead of using the thread-local
+generator:
+
+```rust
+use std::iter::repeat_with;
+
+let rng = fastrand::Rng::new();
+let mut bytes: Vec<u8> = repeat_with(|| rng.u8(..)).take(10_000).collect();
+```
+
+## 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/fastrand/benches/bench.rs b/third_party/rust/fastrand/benches/bench.rs
new file mode 100644
index 0000000000..4b882b74f9
--- /dev/null
+++ b/third_party/rust/fastrand/benches/bench.rs
@@ -0,0 +1,98 @@
+#![feature(test)]
+
+extern crate test;
+
+use rand::prelude::*;
+use test::Bencher;
+use wyhash::WyRng;
+
+#[bench]
+fn shuffle_wyhash(b: &mut Bencher) {
+ let mut rng = WyRng::from_rng(thread_rng()).unwrap();
+ let mut x = (0..100).collect::<Vec<usize>>();
+ b.iter(|| {
+ x.shuffle(&mut rng);
+ x[0]
+ })
+}
+
+#[bench]
+fn shuffle_fastrand(b: &mut Bencher) {
+ let rng = fastrand::Rng::new();
+ let mut x = (0..100).collect::<Vec<usize>>();
+ b.iter(|| {
+ rng.shuffle(&mut x);
+ x[0]
+ })
+}
+
+#[bench]
+fn u8_wyhash(b: &mut Bencher) {
+ let mut rng = WyRng::from_rng(thread_rng()).unwrap();
+ b.iter(|| {
+ let mut sum = 0u8;
+ for _ in 0..10_000 {
+ sum = sum.wrapping_add(rng.gen::<u8>());
+ }
+ sum
+ })
+}
+
+#[bench]
+fn u8_fastrand(b: &mut Bencher) {
+ let rng = fastrand::Rng::new();
+ b.iter(|| {
+ let mut sum = 0u8;
+ for _ in 0..10_000 {
+ sum = sum.wrapping_add(rng.u8(..));
+ }
+ sum
+ })
+}
+
+#[bench]
+fn u32_wyhash(b: &mut Bencher) {
+ let mut rng = WyRng::from_rng(thread_rng()).unwrap();
+ b.iter(|| {
+ let mut sum = 0u32;
+ for _ in 0..10_000 {
+ sum = sum.wrapping_add(rng.gen::<u32>());
+ }
+ sum
+ })
+}
+
+#[bench]
+fn u32_fastrand(b: &mut Bencher) {
+ let rng = fastrand::Rng::new();
+ b.iter(|| {
+ let mut sum = 0u32;
+ for _ in 0..10_000 {
+ sum = sum.wrapping_add(rng.u32(..));
+ }
+ sum
+ })
+}
+
+#[bench]
+fn fill(b: &mut Bencher) {
+ let rng = fastrand::Rng::new();
+ b.iter(|| {
+ // Pick a size that isn't divisble by 8.
+ let mut bytes = [0u8; 367];
+ rng.fill(&mut bytes);
+ bytes
+ })
+}
+
+#[bench]
+fn fill_naive(b: &mut Bencher) {
+ let rng = fastrand::Rng::new();
+ b.iter(|| {
+ let mut bytes = [0u8; 367];
+ for item in &mut bytes {
+ *item = rng.u8(..);
+ }
+ bytes
+ })
+}
diff --git a/third_party/rust/fastrand/src/lib.rs b/third_party/rust/fastrand/src/lib.rs
new file mode 100644
index 0000000000..3f3ec3d9f4
--- /dev/null
+++ b/third_party/rust/fastrand/src/lib.rs
@@ -0,0 +1,706 @@
+//! A simple and fast random number generator.
+//!
+//! The implementation uses [Wyrand](https://github.com/wangyi-fudan/wyhash), a simple and fast
+//! generator but **not** cryptographically secure.
+//!
+//! # Examples
+//!
+//! Flip a coin:
+//!
+//! ```
+//! if fastrand::bool() {
+//! println!("heads");
+//! } else {
+//! println!("tails");
+//! }
+//! ```
+//!
+//! Generate a random `i32`:
+//!
+//! ```
+//! let num = fastrand::i32(..);
+//! ```
+//!
+//! Choose a random element in an array:
+//!
+//! ```
+//! let v = vec![1, 2, 3, 4, 5];
+//! let i = fastrand::usize(..v.len());
+//! let elem = v[i];
+//! ```
+//!
+//! Shuffle an array:
+//!
+//! ```
+//! let mut v = vec![1, 2, 3, 4, 5];
+//! fastrand::shuffle(&mut v);
+//! ```
+//!
+//! Generate a random [`Vec`] or [`String`]:
+//!
+//! ```
+//! use std::iter::repeat_with;
+//!
+//! let v: Vec<i32> = repeat_with(|| fastrand::i32(..)).take(10).collect();
+//! let s: String = repeat_with(fastrand::alphanumeric).take(10).collect();
+//! ```
+//!
+//! To get reproducible results on every run, initialize the generator with a seed:
+//!
+//! ```
+//! // Pick an arbitrary number as seed.
+//! fastrand::seed(7);
+//!
+//! // Now this prints the same number on every run:
+//! println!("{}", fastrand::u32(..));
+//! ```
+//!
+//! To be more efficient, create a new [`Rng`] instance instead of using the thread-local
+//! generator:
+//!
+//! ```
+//! use std::iter::repeat_with;
+//!
+//! let rng = fastrand::Rng::new();
+//! let mut bytes: Vec<u8> = repeat_with(|| rng.u8(..)).take(10_000).collect();
+//! ```
+
+#![forbid(unsafe_code)]
+#![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+
+use std::cell::Cell;
+use std::collections::hash_map::DefaultHasher;
+use std::convert::TryInto;
+use std::hash::{Hash, Hasher};
+use std::ops::{Bound, RangeBounds};
+use std::thread;
+
+#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
+use instant::Instant;
+#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))]
+use std::time::Instant;
+
+/// A random number generator.
+#[derive(Debug, PartialEq, Eq)]
+pub struct Rng(Cell<u64>);
+
+impl Default for Rng {
+ #[inline]
+ fn default() -> Rng {
+ Rng::new()
+ }
+}
+
+impl Clone for Rng {
+ /// Clones the generator by deterministically deriving a new generator based on the initial
+ /// seed.
+ ///
+ /// # Example
+ ///
+ /// ```
+ /// // Seed two generators equally, and clone both of them.
+ /// let base1 = fastrand::Rng::new();
+ /// base1.seed(0x4d595df4d0f33173);
+ /// base1.bool(); // Use the generator once.
+ ///
+ /// let base2 = fastrand::Rng::new();
+ /// base2.seed(0x4d595df4d0f33173);
+ /// base2.bool(); // Use the generator once.
+ ///
+ /// let rng1 = base1.clone();
+ /// let rng2 = base2.clone();
+ ///
+ /// assert_eq!(rng1.u64(..), rng2.u64(..), "the cloned generators are identical");
+ /// ```
+ fn clone(&self) -> Rng {
+ Rng::with_seed(self.gen_u64())
+ }
+}
+
+impl Rng {
+ /// Generates a random `u32`.
+ #[inline]
+ fn gen_u32(&self) -> u32 {
+ self.gen_u64() as u32
+ }
+
+ /// Generates a random `u64`.
+ #[inline]
+ fn gen_u64(&self) -> u64 {
+ let s = self.0.get().wrapping_add(0xA0761D6478BD642F);
+ self.0.set(s);
+ let t = u128::from(s) * u128::from(s ^ 0xE7037ED1A0B428DB);
+ (t as u64) ^ (t >> 64) as u64
+ }
+
+ /// Generates a random `u128`.
+ #[inline]
+ fn gen_u128(&self) -> u128 {
+ (u128::from(self.gen_u64()) << 64) | u128::from(self.gen_u64())
+ }
+
+ /// Generates a random `u32` in `0..n`.
+ #[inline]
+ fn gen_mod_u32(&self, n: u32) -> u32 {
+ // Adapted from: https://lemire.me/blog/2016/06/30/fast-random-shuffling/
+ let mut r = self.gen_u32();
+ let mut hi = mul_high_u32(r, n);
+ let mut lo = r.wrapping_mul(n);
+ if lo < n {
+ let t = n.wrapping_neg() % n;
+ while lo < t {
+ r = self.gen_u32();
+ hi = mul_high_u32(r, n);
+ lo = r.wrapping_mul(n);
+ }
+ }
+ hi
+ }
+
+ /// Generates a random `u64` in `0..n`.
+ #[inline]
+ fn gen_mod_u64(&self, n: u64) -> u64 {
+ // Adapted from: https://lemire.me/blog/2016/06/30/fast-random-shuffling/
+ let mut r = self.gen_u64();
+ let mut hi = mul_high_u64(r, n);
+ let mut lo = r.wrapping_mul(n);
+ if lo < n {
+ let t = n.wrapping_neg() % n;
+ while lo < t {
+ r = self.gen_u64();
+ hi = mul_high_u64(r, n);
+ lo = r.wrapping_mul(n);
+ }
+ }
+ hi
+ }
+
+ /// Generates a random `u128` in `0..n`.
+ #[inline]
+ fn gen_mod_u128(&self, n: u128) -> u128 {
+ // Adapted from: https://lemire.me/blog/2016/06/30/fast-random-shuffling/
+ let mut r = self.gen_u128();
+ let mut hi = mul_high_u128(r, n);
+ let mut lo = r.wrapping_mul(n);
+ if lo < n {
+ let t = n.wrapping_neg() % n;
+ while lo < t {
+ r = self.gen_u128();
+ hi = mul_high_u128(r, n);
+ lo = r.wrapping_mul(n);
+ }
+ }
+ hi
+ }
+}
+
+thread_local! {
+ static RNG: Rng = Rng(Cell::new({
+ let mut hasher = DefaultHasher::new();
+ Instant::now().hash(&mut hasher);
+ thread::current().id().hash(&mut hasher);
+ let hash = hasher.finish();
+ (hash << 1) | 1
+ }));
+}
+
+/// Computes `(a * b) >> 32`.
+#[inline]
+fn mul_high_u32(a: u32, b: u32) -> u32 {
+ (((a as u64) * (b as u64)) >> 32) as u32
+}
+
+/// Computes `(a * b) >> 64`.
+#[inline]
+fn mul_high_u64(a: u64, b: u64) -> u64 {
+ (((a as u128) * (b as u128)) >> 64) as u64
+}
+
+/// Computes `(a * b) >> 128`.
+#[inline]
+fn mul_high_u128(a: u128, b: u128) -> u128 {
+ // Adapted from: https://stackoverflow.com/a/28904636
+ let a_lo = a as u64 as u128;
+ let a_hi = (a >> 64) as u64 as u128;
+ let b_lo = b as u64 as u128;
+ let b_hi = (b >> 64) as u64 as u128;
+ let carry = (a_lo * b_lo) >> 64;
+ let carry = ((a_hi * b_lo) as u64 as u128 + (a_lo * b_hi) as u64 as u128 + carry) >> 64;
+ a_hi * b_hi + ((a_hi * b_lo) >> 64) + ((a_lo * b_hi) >> 64) + carry
+}
+
+macro_rules! rng_integer {
+ ($t:tt, $unsigned_t:tt, $gen:tt, $mod:tt, $doc:tt) => {
+ #[doc = $doc]
+ ///
+ /// Panics if the range is empty.
+ #[inline]
+ pub fn $t(&self, range: impl RangeBounds<$t>) -> $t {
+ let panic_empty_range = || {
+ panic!(
+ "empty range: {:?}..{:?}",
+ range.start_bound(),
+ range.end_bound()
+ )
+ };
+
+ let low = match range.start_bound() {
+ Bound::Unbounded => std::$t::MIN,
+ Bound::Included(&x) => x,
+ Bound::Excluded(&x) => x.checked_add(1).unwrap_or_else(panic_empty_range),
+ };
+
+ let high = match range.end_bound() {
+ Bound::Unbounded => std::$t::MAX,
+ Bound::Included(&x) => x,
+ Bound::Excluded(&x) => x.checked_sub(1).unwrap_or_else(panic_empty_range),
+ };
+
+ if low > high {
+ panic_empty_range();
+ }
+
+ if low == std::$t::MIN && high == std::$t::MAX {
+ self.$gen() as $t
+ } else {
+ let len = high.wrapping_sub(low).wrapping_add(1);
+ low.wrapping_add(self.$mod(len as $unsigned_t as _) as $t)
+ }
+ }
+ };
+}
+
+impl Rng {
+ /// Creates a new random number generator.
+ #[inline]
+ pub fn new() -> Rng {
+ Rng::with_seed(
+ RNG.try_with(|rng| rng.u64(..))
+ .unwrap_or(0x4d595df4d0f33173),
+ )
+ }
+
+ /// Creates a new random number generator with the initial seed.
+ #[inline]
+ #[must_use = "this creates a new instance of `Rng`; if you want to initialize the thread-local generator, use `fastrand::seed()` instead"]
+ pub fn with_seed(seed: u64) -> Self {
+ let rng = Rng(Cell::new(0));
+
+ rng.seed(seed);
+ rng
+ }
+
+ /// Generates a random `char` in ranges a-z and A-Z.
+ #[inline]
+ pub fn alphabetic(&self) -> char {
+ const CHARS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+ let len = CHARS.len() as u8;
+ let i = self.u8(..len);
+ CHARS[i as usize] as char
+ }
+
+ /// Generates a random `char` in ranges a-z, A-Z and 0-9.
+ #[inline]
+ pub fn alphanumeric(&self) -> char {
+ const CHARS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+ let len = CHARS.len() as u8;
+ let i = self.u8(..len);
+ CHARS[i as usize] as char
+ }
+
+ /// Generates a random `bool`.
+ #[inline]
+ pub fn bool(&self) -> bool {
+ self.u8(..) % 2 == 0
+ }
+
+ /// Generates a random digit in the given `base`.
+ ///
+ /// Digits are represented by `char`s in ranges 0-9 and a-z.
+ ///
+ /// Panics if the base is zero or greater than 36.
+ #[inline]
+ pub fn digit(&self, base: u32) -> char {
+ if base == 0 {
+ panic!("base cannot be zero");
+ }
+ if base > 36 {
+ panic!("base cannot be larger than 36");
+ }
+ let num = self.u8(..base as u8);
+ if num < 10 {
+ (b'0' + num) as char
+ } else {
+ (b'a' + num - 10) as char
+ }
+ }
+
+ /// Generates a random `f32` in range `0..1`.
+ pub fn f32(&self) -> f32 {
+ let b = 32;
+ let f = std::f32::MANTISSA_DIGITS - 1;
+ f32::from_bits((1 << (b - 2)) - (1 << f) + (self.u32(..) >> (b - f))) - 1.0
+ }
+
+ /// Generates a random `f64` in range `0..1`.
+ pub fn f64(&self) -> f64 {
+ let b = 64;
+ let f = std::f64::MANTISSA_DIGITS - 1;
+ f64::from_bits((1 << (b - 2)) - (1 << f) + (self.u64(..) >> (b - f))) - 1.0
+ }
+
+ rng_integer!(
+ i8,
+ u8,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `i8` in the given range."
+ );
+
+ rng_integer!(
+ i16,
+ u16,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `i16` in the given range."
+ );
+
+ rng_integer!(
+ i32,
+ u32,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `i32` in the given range."
+ );
+
+ rng_integer!(
+ i64,
+ u64,
+ gen_u64,
+ gen_mod_u64,
+ "Generates a random `i64` in the given range."
+ );
+
+ rng_integer!(
+ i128,
+ u128,
+ gen_u128,
+ gen_mod_u128,
+ "Generates a random `i128` in the given range."
+ );
+
+ #[cfg(target_pointer_width = "16")]
+ rng_integer!(
+ isize,
+ usize,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `isize` in the given range."
+ );
+ #[cfg(target_pointer_width = "32")]
+ rng_integer!(
+ isize,
+ usize,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `isize` in the given range."
+ );
+ #[cfg(target_pointer_width = "64")]
+ rng_integer!(
+ isize,
+ usize,
+ gen_u64,
+ gen_mod_u64,
+ "Generates a random `isize` in the given range."
+ );
+
+ /// Generates a random `char` in range a-z.
+ #[inline]
+ pub fn lowercase(&self) -> char {
+ const CHARS: &[u8] = b"abcdefghijklmnopqrstuvwxyz";
+ let len = CHARS.len() as u8;
+ let i = self.u8(..len);
+ CHARS[i as usize] as char
+ }
+
+ /// Initializes this generator with the given seed.
+ #[inline]
+ pub fn seed(&self, seed: u64) {
+ self.0.set(seed);
+ }
+
+ /// Gives back **current** seed that is being held by this generator.
+ #[inline]
+ pub fn get_seed(&self) -> u64 {
+ self.0.get()
+ }
+
+ /// Shuffles a slice randomly.
+ #[inline]
+ pub fn shuffle<T>(&self, slice: &mut [T]) {
+ for i in 1..slice.len() {
+ slice.swap(i, self.usize(..=i));
+ }
+ }
+
+ /// Fill a byte slice with random data.
+ #[inline]
+ pub fn fill(&self, slice: &mut [u8]) {
+ // We fill the slice by chunks of 8 bytes, or one block of
+ // WyRand output per new state.
+ let mut chunks = slice.chunks_exact_mut(core::mem::size_of::<u64>());
+ for chunk in chunks.by_ref() {
+ let n = self.gen_u64().to_ne_bytes();
+ // Safe because the chunks are always 8 bytes exactly.
+ chunk.copy_from_slice(&n);
+ }
+
+ let remainder = chunks.into_remainder();
+
+ // Any remainder will always be less than 8 bytes.
+ if !remainder.is_empty() {
+ // Generate one last block of 8 bytes of entropy
+ let n = self.gen_u64().to_ne_bytes();
+
+ // Use the remaining length to copy from block
+ remainder.copy_from_slice(&n[..remainder.len()]);
+ }
+ }
+
+ rng_integer!(
+ u8,
+ u8,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `u8` in the given range."
+ );
+
+ rng_integer!(
+ u16,
+ u16,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `u16` in the given range."
+ );
+
+ rng_integer!(
+ u32,
+ u32,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `u32` in the given range."
+ );
+
+ rng_integer!(
+ u64,
+ u64,
+ gen_u64,
+ gen_mod_u64,
+ "Generates a random `u64` in the given range."
+ );
+
+ rng_integer!(
+ u128,
+ u128,
+ gen_u128,
+ gen_mod_u128,
+ "Generates a random `u128` in the given range."
+ );
+
+ #[cfg(target_pointer_width = "16")]
+ rng_integer!(
+ usize,
+ usize,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `usize` in the given range."
+ );
+ #[cfg(target_pointer_width = "32")]
+ rng_integer!(
+ usize,
+ usize,
+ gen_u32,
+ gen_mod_u32,
+ "Generates a random `usize` in the given range."
+ );
+ #[cfg(target_pointer_width = "64")]
+ rng_integer!(
+ usize,
+ usize,
+ gen_u64,
+ gen_mod_u64,
+ "Generates a random `usize` in the given range."
+ );
+ #[cfg(target_pointer_width = "128")]
+ rng_integer!(
+ usize,
+ usize,
+ gen_u128,
+ gen_mod_u128,
+ "Generates a random `usize` in the given range."
+ );
+
+ /// Generates a random `char` in range A-Z.
+ #[inline]
+ pub fn uppercase(&self) -> char {
+ const CHARS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ let len = CHARS.len() as u8;
+ let i = self.u8(..len);
+ CHARS[i as usize] as char
+ }
+
+ /// Generates a random `char` in the given range.
+ ///
+ /// Panics if the range is empty.
+ #[inline]
+ pub fn char(&self, range: impl RangeBounds<char>) -> char {
+ use std::convert::TryFrom;
+
+ let panic_empty_range = || {
+ panic!(
+ "empty range: {:?}..{:?}",
+ range.start_bound(),
+ range.end_bound()
+ )
+ };
+
+ let surrogate_start = 0xd800u32;
+ let surrogate_len = 0x800u32;
+
+ let low = match range.start_bound() {
+ Bound::Unbounded => 0u8 as char,
+ Bound::Included(&x) => x,
+ Bound::Excluded(&x) => {
+ let scalar = if x as u32 == surrogate_start - 1 {
+ surrogate_start + surrogate_len
+ } else {
+ x as u32 + 1
+ };
+ char::try_from(scalar).unwrap_or_else(|_| panic_empty_range())
+ }
+ };
+
+ let high = match range.end_bound() {
+ Bound::Unbounded => std::char::MAX,
+ Bound::Included(&x) => x,
+ Bound::Excluded(&x) => {
+ let scalar = if x as u32 == surrogate_start + surrogate_len {
+ surrogate_start - 1
+ } else {
+ (x as u32).wrapping_sub(1)
+ };
+ char::try_from(scalar).unwrap_or_else(|_| panic_empty_range())
+ }
+ };
+
+ if low > high {
+ panic_empty_range();
+ }
+
+ let gap = if (low as u32) < surrogate_start && (high as u32) >= surrogate_start {
+ surrogate_len
+ } else {
+ 0
+ };
+ let range = high as u32 - low as u32 - gap;
+ let mut val = self.u32(0..=range) + low as u32;
+ if val >= surrogate_start {
+ val += gap;
+ }
+ val.try_into().unwrap()
+ }
+}
+
+/// Initializes the thread-local generator with the given seed.
+#[inline]
+pub fn seed(seed: u64) {
+ RNG.with(|rng| rng.seed(seed))
+}
+
+/// Gives back **current** seed that is being held by the thread-local generator.
+#[inline]
+pub fn get_seed() -> u64 {
+ RNG.with(|rng| rng.get_seed())
+}
+
+/// Generates a random `bool`.
+#[inline]
+pub fn bool() -> bool {
+ RNG.with(|rng| rng.bool())
+}
+
+/// Generates a random `char` in ranges a-z and A-Z.
+#[inline]
+pub fn alphabetic() -> char {
+ RNG.with(|rng| rng.alphabetic())
+}
+
+/// Generates a random `char` in ranges a-z, A-Z and 0-9.
+#[inline]
+pub fn alphanumeric() -> char {
+ RNG.with(|rng| rng.alphanumeric())
+}
+
+/// Generates a random `char` in range a-z.
+#[inline]
+pub fn lowercase() -> char {
+ RNG.with(|rng| rng.lowercase())
+}
+
+/// Generates a random `char` in range A-Z.
+#[inline]
+pub fn uppercase() -> char {
+ RNG.with(|rng| rng.uppercase())
+}
+
+/// Generates a random digit in the given `base`.
+///
+/// Digits are represented by `char`s in ranges 0-9 and a-z.
+///
+/// Panics if the base is zero or greater than 36.
+#[inline]
+pub fn digit(base: u32) -> char {
+ RNG.with(|rng| rng.digit(base))
+}
+
+/// Shuffles a slice randomly.
+#[inline]
+pub fn shuffle<T>(slice: &mut [T]) {
+ RNG.with(|rng| rng.shuffle(slice))
+}
+
+macro_rules! integer {
+ ($t:tt, $doc:tt) => {
+ #[doc = $doc]
+ ///
+ /// Panics if the range is empty.
+ #[inline]
+ pub fn $t(range: impl RangeBounds<$t>) -> $t {
+ RNG.with(|rng| rng.$t(range))
+ }
+ };
+}
+
+integer!(u8, "Generates a random `u8` in the given range.");
+integer!(i8, "Generates a random `i8` in the given range.");
+integer!(u16, "Generates a random `u16` in the given range.");
+integer!(i16, "Generates a random `i16` in the given range.");
+integer!(u32, "Generates a random `u32` in the given range.");
+integer!(i32, "Generates a random `i32` in the given range.");
+integer!(u64, "Generates a random `u64` in the given range.");
+integer!(i64, "Generates a random `i64` in the given range.");
+integer!(u128, "Generates a random `u128` in the given range.");
+integer!(i128, "Generates a random `i128` in the given range.");
+integer!(usize, "Generates a random `usize` in the given range.");
+integer!(isize, "Generates a random `isize` in the given range.");
+integer!(char, "Generates a random `char` in the given range.");
+
+/// Generates a random `f32` in range `0..1`.
+pub fn f32() -> f32 {
+ RNG.with(|rng| rng.f32())
+}
+
+/// Generates a random `f64` in range `0..1`.
+pub fn f64() -> f64 {
+ RNG.with(|rng| rng.f64())
+}
diff --git a/third_party/rust/fastrand/tests/char.rs b/third_party/rust/fastrand/tests/char.rs
new file mode 100644
index 0000000000..0f48c57708
--- /dev/null
+++ b/third_party/rust/fastrand/tests/char.rs
@@ -0,0 +1,44 @@
+use std::convert::TryFrom;
+use std::ops::RangeBounds;
+
+fn test_char_coverage<R>(n: usize, range: R)
+where
+ R: Iterator<Item = char> + RangeBounds<char> + Clone,
+{
+ use std::collections::HashSet;
+
+ let all: HashSet<char> = range.clone().collect();
+ let mut covered = HashSet::new();
+ for _ in 0..n {
+ let c = fastrand::char(range.clone());
+ assert!(all.contains(&c));
+ covered.insert(c);
+ }
+ assert_eq!(covered, all);
+}
+
+#[test]
+fn test_char() {
+ // ASCII control chars.
+ let nul = 0u8 as char;
+ let soh = 1u8 as char;
+ let stx = 2u8 as char;
+ // Some undefined Hangul Jamo codepoints just before
+ // the surrogate area.
+ let last_jamo = char::try_from(0xd7ffu32).unwrap();
+ let penultimate_jamo = char::try_from(last_jamo as u32 - 1).unwrap();
+ // Private-use codepoints just after the surrogate area.
+ let first_private = char::try_from(0xe000u32).unwrap();
+ let second_private = char::try_from(first_private as u32 + 1).unwrap();
+ // Private-use codepoints at the end of Unicode space.
+ let last_private = std::char::MAX;
+ let penultimate_private = char::try_from(last_private as u32 - 1).unwrap();
+
+ test_char_coverage(100, nul..stx);
+ test_char_coverage(100, nul..=soh);
+
+ test_char_coverage(400, penultimate_jamo..second_private);
+ test_char_coverage(400, penultimate_jamo..=second_private);
+
+ test_char_coverage(100, penultimate_private..=last_private);
+}
diff --git a/third_party/rust/fastrand/tests/smoke.rs b/third_party/rust/fastrand/tests/smoke.rs
new file mode 100644
index 0000000000..ff3cea66db
--- /dev/null
+++ b/third_party/rust/fastrand/tests/smoke.rs
@@ -0,0 +1,120 @@
+#[cfg(all(target_family = "wasm", not(target_os = "wasi")))]
+use wasm_bindgen_test::wasm_bindgen_test as test;
+
+#[cfg(all(target_family = "wasm", not(target_os = "wasi")))]
+wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
+
+#[test]
+fn bool() {
+ for x in &[false, true] {
+ while fastrand::bool() != *x {}
+ }
+}
+
+#[test]
+fn u8() {
+ for x in 0..10 {
+ while fastrand::u8(..10) != x {}
+ }
+
+ for x in 200..=u8::MAX {
+ while fastrand::u8(200..) != x {}
+ }
+}
+
+#[test]
+fn i8() {
+ for x in -128..-120 {
+ while fastrand::i8(..-120) != x {}
+ }
+
+ for x in 120..=127 {
+ while fastrand::i8(120..) != x {}
+ }
+}
+
+#[test]
+fn u32() {
+ for n in 1u32..10_000 {
+ let n = n.wrapping_mul(n);
+ let n = n.wrapping_mul(n);
+ if n != 0 {
+ for _ in 0..1000 {
+ assert!(fastrand::u32(..n) < n);
+ }
+ }
+ }
+}
+
+#[test]
+fn u64() {
+ for n in 1u64..10_000 {
+ let n = n.wrapping_mul(n);
+ let n = n.wrapping_mul(n);
+ let n = n.wrapping_mul(n);
+ if n != 0 {
+ for _ in 0..1000 {
+ assert!(fastrand::u64(..n) < n);
+ }
+ }
+ }
+}
+
+#[test]
+fn u128() {
+ for n in 1u128..10_000 {
+ let n = n.wrapping_mul(n);
+ let n = n.wrapping_mul(n);
+ let n = n.wrapping_mul(n);
+ let n = n.wrapping_mul(n);
+ if n != 0 {
+ for _ in 0..1000 {
+ assert!(fastrand::u128(..n) < n);
+ }
+ }
+ }
+}
+
+#[test]
+fn fill() {
+ let r = fastrand::Rng::new();
+ let mut a = [0u8; 64];
+ let mut b = [0u8; 64];
+
+ r.fill(&mut a);
+ r.fill(&mut b);
+
+ assert_ne!(a, b);
+}
+
+#[test]
+fn rng() {
+ let r = fastrand::Rng::new();
+
+ assert_ne!(r.u64(..), r.u64(..));
+
+ r.seed(7);
+ let a = r.u64(..);
+ r.seed(7);
+ let b = r.u64(..);
+ assert_eq!(a, b);
+}
+
+#[test]
+fn rng_init() {
+ let a = fastrand::Rng::new();
+ let b = fastrand::Rng::new();
+ assert_ne!(a.u64(..), b.u64(..));
+
+ a.seed(7);
+ b.seed(7);
+ assert_eq!(a.u64(..), b.u64(..));
+}
+
+#[test]
+fn with_seed() {
+ let a = fastrand::Rng::with_seed(7);
+ let b = fastrand::Rng::new();
+ b.seed(7);
+ assert_eq!(a.u64(..), b.u64(..));
+}