Sync to upstream/master

.github/workflows/ci.yml

@@ -18,9 +18,20 @@ permissions:
 env:
   RUSTFLAGS: -Dwarnings
 
+permissions:
+  contents: read
+
+env:
+  RUSTFLAGS: -Dwarnings
+
 jobs:
+  pre_ci:
+    uses: dtolnay/.github/.github/workflows/pre_ci.yml@master
+
   test:
     name: Rust ${{matrix.rust}}
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -41,7 +52,10 @@ jobs:
         if: matrix.rust == 'nightly'
 
   msrv:
+
     name: Rust 1.64.0
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
@@ -50,13 +64,30 @@ jobs:
       - run: cargo build
       - run: cargo build --features small
 
+  doc:
+    name: Documentation
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    env:
+      RUSTDOCFLAGS: -Dwarnings
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+      - uses: dtolnay/install@cargo-docs-rs
+      - run: cargo docs-rs
+
   miri:
     name: Miri
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@miri
+      - run: cargo miri setup
       - run: cargo miri test
         env:
           MIRIFLAGS: -Zmiri-strict-provenance
@@ -82,6 +113,8 @@ jobs:
 
   fuzz:
     name: Fuzz
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:

Cargo.toml

@@ -2,7 +2,7 @@
 name = "ryu-js"
 version = "1.0.0"
 authors = ["David Tolnay <[email protected]>", "boa-dev"]
-categories = ["value-formatting", "no-std"]
+categories = ["value-formatting", "no-std", "no-std::no-alloc"]
 description = "Fast floating point to string conversion, ECMAScript compliant."
 documentation = "https://docs.rs/ryu-js"
 edition = "2018"
@@ -35,6 +35,9 @@ doc-scrape-examples = false
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]
 
+# See: https://github.com/rust-lang/rust/pull/84176
+rustdoc-args = ["--generate-link-to-definition"]
+
 [[bench]]
 name = "bench"
 harness = false

README.md

@@ -16,7 +16,7 @@ under the creative commons CC-BY-SA license.
 This Rust implementation is a line-by-line port of Ulf Adams' implementation in
 C, [https://github.com/ulfjack/ryu][upstream].
 
-*Requirements: this crate supports any compiler version back to rustc 1.64; it
+*Requirements: This crate supports any compiler version back to rustc 1.64; it
 uses nothing from the Rust standard library so is usable from no_std crates.*
 
 [paper]: https://dl.acm.org/citation.cfm?id=3192369
@@ -54,7 +54,7 @@ You can run upstream's benchmarks with:
 ```console
 $ git clone https://github.com/ulfjack/ryu c-ryu
 $ cd c-ryu
-$ bazel run -c opt //ryu/benchmark:ryu_benchmark --
+$ bazel run -c opt //ryu/benchmark:ryu_benchmark
 ```
 
 And the same benchmark against our implementation with:

fuzz/.gitignore

@@ -1,3 +1,4 @@
-target
-corpus
-artifacts
+artifacts/
+corpus/
+coverage/
+target/

fuzz/Cargo.toml

@@ -13,6 +13,9 @@ arbitrary = { version = "1", features = ["derive"] }
 libfuzzer-sys = "0.4"
 ryu-js = { path = ".." }
 
+[features]
+small = ["ryu-js/small"]
+
 [[bin]]
 name = "fuzz_ryu_js"
 path = "fuzz_targets/fuzz_ryu_js.rs"

src/buffer/mod.rs

@@ -21,7 +21,7 @@ const BUFFER_SIZE: usize = MAX_BUFFER_SIZE;
 /// let printed = buffer.format_finite(1.234);
 /// assert_eq!(printed, "1.234");
 /// ```
-#[derive(Copy, Clone)]
+#[derive(Copy)]
 pub struct Buffer {
     bytes: [MaybeUninit<u8>; BUFFER_SIZE],
 }
@@ -119,6 +119,14 @@ impl Buffer {
     }
 }
 
+impl Clone for Buffer {
+    #[inline]
+    #[allow(clippy::non_canonical_clone_impl)] // false positive https://github.com/rust-lang/rust-clippy/issues/11072
+    fn clone(&self) -> Self {
+        Buffer::new()
+    }
+}
+
 impl Default for Buffer {
     #[inline]
     #[cfg_attr(feature = "no-panic", no_panic)]

src/d2s.rs

@@ -18,12 +18,14 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 // KIND, either express or implied.
 
-use crate::common::*;
+use crate::common::{log10_pow2, log10_pow5, pow5bits};
 #[cfg(not(feature = "small"))]
-pub use crate::d2s_full_table::*;
-use crate::d2s_intrinsics::*;
+pub use crate::d2s_full_table::{DOUBLE_POW5_INV_SPLIT, DOUBLE_POW5_SPLIT};
+use crate::d2s_intrinsics::{
+    div10, div100, div5, mul_shift_all_64, multiple_of_power_of_2, multiple_of_power_of_5,
+};
 #[cfg(feature = "small")]
-pub use crate::d2s_small_table::*;
+pub use crate::d2s_small_table::{compute_inv_pow5, compute_pow5};
 use core::mem::MaybeUninit;
 
 pub const DOUBLE_MANTISSA_BITS: u32 = 52;

src/d2s_intrinsics.rs

@@ -36,16 +36,16 @@ pub fn div100(x: u64) -> u64 {
 }
 
 #[cfg_attr(feature = "no-panic", inline)]
-fn pow5_factor(mut value: u64) -> u32 {
+pub(crate) fn pow5_factor(mut value: u64) -> u32 {
+    const M_INV_5: u64 = 14757395258967641293; // 5 * m_inv_5 = 1 (mod 2^64)
+    const N_DIV_5: u64 = 3689348814741910323; // #{ n | n = 0 (mod 2^64) } = 2^64 / 5
     let mut count = 0u32;
     loop {
         debug_assert!(value != 0);
-        let q = div5(value);
-        let r = (value as u32).wrapping_sub(5u32.wrapping_mul(q as u32));
-        if r != 0 {
+        value = value.wrapping_mul(M_INV_5);
+        if value > N_DIV_5 {
             break;
         }
-        value = q;
         count += 1;
     }
     count

src/d2s_small_table.rs

@@ -18,7 +18,7 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 // KIND, either express or implied.
 
-use crate::common::*;
+use crate::common::pow5bits;
 
 pub static DOUBLE_POW5_INV_SPLIT2: [(u64, u64); 15] = [
     (1, 2305843009213693952),

src/f2s.rs

@@ -18,8 +18,10 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 // KIND, either express or implied.
 
-use crate::common::*;
-use crate::f2s_intrinsics::*;
+use crate::common::{log10_pow2, log10_pow5, pow5bits};
+use crate::f2s_intrinsics::{
+    mul_pow5_div_pow2, mul_pow5_inv_div_pow2, multiple_of_power_of_2_32, multiple_of_power_of_5_32,
+};
 
 pub const FLOAT_MANTISSA_BITS: u32 = 23;
 pub const FLOAT_EXPONENT_BITS: u32 = 8;

src/lib.rs

@@ -66,6 +66,7 @@
     clippy::missing_panics_doc,
     clippy::module_name_repetitions,
     clippy::must_use_candidate,
+    clippy::needless_doctest_main,
     clippy::similar_names,
     clippy::too_many_lines,
     clippy::unreadable_literal,

src/pretty/exponent.rs

@@ -1,4 +1,4 @@
-use crate::digit_table::*;
+use crate::digit_table::DIGIT_TABLE;
 use core::ptr;
 
 #[cfg_attr(feature = "no-panic", inline)]

src/pretty/mantissa.rs

@@ -1,4 +1,4 @@
-use crate::digit_table::*;
+use crate::digit_table::DIGIT_TABLE;
 use core::ptr;
 
 #[cfg_attr(feature = "no-panic", inline)]

src/pretty/mod.rs

@@ -1,11 +1,11 @@
 mod exponent;
 mod mantissa;
 
-use self::exponent::*;
-use self::mantissa::*;
+use self::exponent::{write_exponent2, write_exponent3};
+use self::mantissa::{write_mantissa, write_mantissa_long};
 use crate::common;
-use crate::d2s::{self, *};
-use crate::f2s::*;
+use crate::d2s::{self, d2d, DOUBLE_EXPONENT_BITS, DOUBLE_MANTISSA_BITS};
+use crate::f2s::{f2d, FLOAT_EXPONENT_BITS, FLOAT_MANTISSA_BITS};
 use core::ptr;
 #[cfg(feature = "no-panic")]
 use no_panic::no_panic;
@@ -54,6 +54,7 @@ pub use to_fixed::format64_to_fixed;
 #[cfg_attr(feature = "no-panic", no_panic)]
 pub unsafe fn format64(f: f64, result: *mut u8) -> usize {
     debug_assert!(!result.is_null());
+
     let bits = f.to_bits();
     let sign = ((bits >> (DOUBLE_MANTISSA_BITS + DOUBLE_EXPONENT_BITS)) & 1) != 0;
     let ieee_mantissa = bits & ((1u64 << DOUBLE_MANTISSA_BITS) - 1);
@@ -160,6 +161,7 @@ pub unsafe fn format64(f: f64, result: *mut u8) -> usize {
 #[cfg_attr(feature = "no-panic", no_panic)]
 pub unsafe fn format32(f: f32, result: *mut u8) -> usize {
     debug_assert!(!result.is_null());
+
     let bits = f.to_bits();
     let sign = ((bits >> (FLOAT_MANTISSA_BITS + FLOAT_EXPONENT_BITS)) & 1) != 0;
     let ieee_mantissa = bits & ((1u32 << FLOAT_MANTISSA_BITS) - 1);

src/s2d.rs

@@ -1,6 +1,6 @@
-use crate::common::*;
+use crate::common::{ceil_log2_pow5, log2_pow5};
 use crate::d2s;
-use crate::d2s_intrinsics::*;
+use crate::d2s_intrinsics::{mul_shift_64, multiple_of_power_of_2, multiple_of_power_of_5};
 use crate::parse::Error;
 #[cfg(feature = "no-panic")]
 use no_panic::no_panic;

src/s2f.rs

@@ -1,6 +1,8 @@
-use crate::common::*;
+use crate::common::{ceil_log2_pow5, log2_pow5};
 use crate::f2s;
-use crate::f2s_intrinsics::*;
+use crate::f2s_intrinsics::{
+    mul_pow5_div_pow2, mul_pow5_inv_div_pow2, multiple_of_power_of_2_32, multiple_of_power_of_5_32,
+};
 use crate::parse::Error;
 #[cfg(feature = "no-panic")]
 use no_panic::no_panic;

tests/common_test.rs

@@ -31,7 +31,7 @@
 #[path = "../src/common.rs"]
 mod common;
 
-use common::*;
+use common::{ceil_log2_pow5, decimal_length9, log10_pow2, log10_pow5};
 
 #[test]
 fn test_decimal_length9() {

tests/d2s_intrinsics_test.rs

@@ -0,0 +1,72 @@
+// Translated from C to Rust. The original C code can be found at
+// https://github.com/ulfjack/ryu and carries the following license:
+//
+// Copyright 2018 Ulf Adams
+//
+// The contents of this file may be used under the terms of the Apache License,
+// Version 2.0.
+//
+//    (See accompanying file LICENSE-Apache or copy at
+//     http://www.apache.org/licenses/LICENSE-2.0)
+//
+// Alternatively, the contents of this file may be used under the terms of
+// the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE-Boost or copy at
+//     https://www.boost.org/LICENSE_1_0.txt)
+//
+// Unless required by applicable law or agreed to in writing, this software
+// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.
+
+#![allow(dead_code)]
+#![allow(
+    clippy::cast_lossless,
+    clippy::cast_possible_truncation,
+    clippy::unreadable_literal
+)]
+
+#[path = "../src/d2s_intrinsics.rs"]
+mod d2s_intrinsics;
+
+use d2s_intrinsics::pow5_factor;
+
+#[test]
+fn test_pow5_factor() {
+    assert_eq!(0, pow5_factor(1));
+    assert_eq!(0, pow5_factor(2));
+    assert_eq!(0, pow5_factor(3));
+    assert_eq!(0, pow5_factor(4));
+    assert_eq!(1, pow5_factor(5));
+    assert_eq!(0, pow5_factor(6));
+    assert_eq!(0, pow5_factor(7));
+    assert_eq!(0, pow5_factor(8));
+    assert_eq!(0, pow5_factor(9));
+    assert_eq!(1, pow5_factor(10));
+
+    assert_eq!(0, pow5_factor(12));
+    assert_eq!(0, pow5_factor(14));
+    assert_eq!(0, pow5_factor(16));
+    assert_eq!(0, pow5_factor(18));
+    assert_eq!(1, pow5_factor(20));
+
+    assert_eq!(2, pow5_factor(5 * 5));
+    assert_eq!(3, pow5_factor(5 * 5 * 5));
+    assert_eq!(4, pow5_factor(5 * 5 * 5 * 5));
+    assert_eq!(5, pow5_factor(5 * 5 * 5 * 5 * 5));
+    assert_eq!(6, pow5_factor(5 * 5 * 5 * 5 * 5 * 5));
+    assert_eq!(7, pow5_factor(5 * 5 * 5 * 5 * 5 * 5 * 5));
+    assert_eq!(8, pow5_factor(5 * 5 * 5 * 5 * 5 * 5 * 5 * 5));
+    assert_eq!(9, pow5_factor(5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5));
+    assert_eq!(10, pow5_factor(5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5));
+
+    assert_eq!(0, pow5_factor(42));
+    assert_eq!(1, pow5_factor(42 * 5));
+    assert_eq!(2, pow5_factor(42 * 5 * 5));
+    assert_eq!(3, pow5_factor(42 * 5 * 5 * 5));
+    assert_eq!(4, pow5_factor(42 * 5 * 5 * 5 * 5));
+    assert_eq!(5, pow5_factor(42 * 5 * 5 * 5 * 5 * 5));
+
+    assert_eq!(27, pow5_factor(7450580596923828125)); // 5^27, largest power of 5 < 2^64.
+    assert_eq!(1, pow5_factor(18446744073709551615)); // 2^64 - 1, largest multiple of 5 < 2^64.
+    assert_eq!(0, pow5_factor(18446744073709551614)); // 2^64 - 2, largest non-multiple of 5 < 2^64.
+}

tests/d2s_table_test.rs

@@ -41,8 +41,8 @@ mod d2s_intrinsics;
 #[path = "../src/d2s_small_table.rs"]
 mod d2s_small_table;
 
-use d2s_full_table::*;
-use d2s_small_table::*;
+use d2s_full_table::{DOUBLE_POW5_INV_SPLIT, DOUBLE_POW5_SPLIT};
+use d2s_small_table::{compute_inv_pow5, compute_pow5};
 
 #[test]
 fn test_compute_pow5() {

tests/d2s_test.rs

@@ -78,6 +78,18 @@ fn test_non_finite() {
     }
 }
 
+#[test]
+fn test_basic() {
+    assert_eq!(pretty(0.0), "0");
+    assert_eq!(pretty(-0.0), "0");
+    assert_eq!(pretty(1.0), "1");
+    assert_eq!(pretty(-1.0), "-1");
+    assert_eq!(pretty(f64::NAN.copysign(1.0)), "NaN");
+    assert_eq!(pretty(f64::NAN.copysign(-1.0)), "NaN");
+    assert_eq!(pretty(f64::INFINITY), "Infinity");
+    assert_eq!(pretty(f64::NEG_INFINITY), "-Infinity");
+}
+
 #[test]
 fn test_switch_to_subnormal() {
     check!(2.2250738585072014e-308);