Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 403 insertions, 0 deletions

diff --git a/third_party/rust/itoa/src/lib.rs b/third_party/rust/itoa/src/lib.rs
new file mode 100644
index 0000000000..323bb6e2fe
--- /dev/null
+++ b/third_party/rust/itoa/src/lib.rs
@@ -0,0 +1,342 @@
+//! This crate provides fast functions for printing integer primitives to an
+//! [`io::Write`] or a [`fmt::Write`]. The implementation comes straight from
+//! [libcore] but avoids the performance penalty of going through
+//! [`fmt::Formatter`].
+//!
+//! See also [`dtoa`] for printing floating point primitives.
+//!
+//! [`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+//! [`fmt::Write`]: https://doc.rust-lang.org/core/fmt/trait.Write.html
+//! [libcore]: https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L201-L254
+//! [`fmt::Formatter`]: https://doc.rust-lang.org/std/fmt/struct.Formatter.html
+//! [`dtoa`]: https://github.com/dtolnay/dtoa
+//!
+//! <br>
+//!
+//! # Performance (lower is better)
+//!
+//! ![performance](https://raw.githubusercontent.com/dtolnay/itoa/master/performance.png)
+//!
+//! <br>
+//!
+//! # Examples
+//!
+//! ```edition2018
+//! use std::{fmt, io};
+//!
+//! fn demo_itoa_write() -> io::Result<()> {
+//!     // Write to a vector or other io::Write.
+//!     let mut buf = Vec::new();
+//!     itoa::write(&mut buf, 128u64)?;
+//!     println!("{:?}", buf);
+//!
+//!     // Write to a stack buffer.
+//!     let mut bytes = [0u8; 20];
+//!     let n = itoa::write(&mut bytes[..], 128u64)?;
+//!     println!("{:?}", &bytes[..n]);
+//!
+//!     Ok(())
+//! }
+//!
+//! fn demo_itoa_fmt() -> fmt::Result {
+//!     // Write to a string.
+//!     let mut s = String::new();
+//!     itoa::fmt(&mut s, 128u64)?;
+//!     println!("{}", s);
+//!
+//!     Ok(())
+//! }
+//! ```
+
+#![doc(html_root_url = "https://docs.rs/itoa/0.4.4")]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    allow(const_static_lifetime, transmute_ptr_to_ptr),
+)]
+
+#[cfg(feature = "i128")]
+mod udiv128;
+
+#[cfg(feature = "std")]
+use std::{fmt, io, mem, ptr, slice, str};
+
+#[cfg(not(feature = "std"))]
+use core::{fmt, mem, ptr, slice, str};
+
+/// Write integer to an `io::Write`.
+#[cfg(feature = "std")]
+#[inline]
+pub fn write<W: io::Write, V: Integer>(mut wr: W, value: V) -> io::Result<usize> {
+    let mut buf = Buffer::new();
+    let s = buf.format(value);
+    try!(wr.write_all(s.as_bytes()));
+    Ok(s.len())
+}
+
+/// Write integer to an `fmt::Write`.
+#[inline]
+pub fn fmt<W: fmt::Write, V: Integer>(mut wr: W, value: V) -> fmt::Result {
+    let mut buf = Buffer::new();
+    wr.write_str(buf.format(value))
+}
+
+/// A safe API for formatting integers to text.
+///
+/// # Example
+///
+/// ```
+/// let mut buffer = itoa::Buffer::new();
+/// let printed = buffer.format(1234);
+/// assert_eq!(printed, "1234");
+/// ```
+#[derive(Copy)]
+pub struct Buffer {
+    bytes: [u8; I128_MAX_LEN],
+}
+
+impl Default for Buffer {
+    #[inline]
+    fn default() -> Buffer {
+        Buffer::new()
+    }
+}
+
+impl Clone for Buffer {
+    #[inline]
+    fn clone(&self) -> Self {
+        Buffer::new()
+    }
+}
+
+impl Buffer {
+    /// This is a cheap operation; you don't need to worry about reusing buffers
+    /// for efficiency.
+    #[inline]
+    pub fn new() -> Buffer {
+        Buffer {
+            bytes: unsafe { mem::uninitialized() },
+        }
+    }
+
+    /// Print an integer into this buffer and return a reference to its string representation
+    /// within the buffer.
+    pub fn format<I: Integer>(&mut self, i: I) -> &str {
+        i.write(self)
+    }
+}
+
+// Seal to prevent downstream implementations of the Integer trait.
+mod private {
+    pub trait Sealed {}
+}
+
+/// An integer that can be formatted by `itoa::write` and `itoa::fmt`.
+///
+/// This trait is sealed and cannot be implemented for types outside of itoa.
+pub trait Integer: private::Sealed {
+    // Not public API.
+    #[doc(hidden)]
+    fn write(self, buf: &mut Buffer) -> &str;
+}
+
+trait IntegerPrivate<B> {
+    fn write_to(self, buf: &mut B) -> &[u8];
+}
+
+const DEC_DIGITS_LUT: &'static [u8] = b"\
+      0001020304050607080910111213141516171819\
+      2021222324252627282930313233343536373839\
+      4041424344454647484950515253545556575859\
+      6061626364656667686970717273747576777879\
+      8081828384858687888990919293949596979899";
+
+// Adaptation of the original implementation at
+// https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L188-L266
+macro_rules! impl_IntegerCommon {
+    ($max_len:expr, $t:ident) => {
+        impl Integer for $t {
+            #[inline]
+            fn write(self, buf: &mut Buffer) -> &str {
+                unsafe {
+                    debug_assert!($max_len <= I128_MAX_LEN);
+                    let buf = mem::transmute::<&mut [u8; I128_MAX_LEN], &mut [u8; $max_len]>(
+                        &mut buf.bytes,
+                    );
+                    let bytes = self.write_to(buf);
+                    str::from_utf8_unchecked(bytes)
+                }
+            }
+        }
+
+        impl private::Sealed for $t {}
+    };
+}
+
+macro_rules! impl_Integer {
+    ($($max_len:expr => $t:ident),* as $conv_fn:ident) => {$(
+        impl_IntegerCommon!($max_len, $t);
+
+        impl IntegerPrivate<[u8; $max_len]> for $t {
+            #[allow(unused_comparisons)]
+            #[inline]
+            fn write_to(self, buf: &mut [u8; $max_len]) -> &[u8] {
+                let is_nonnegative = self >= 0;
+                let mut n = if is_nonnegative {
+                    self as $conv_fn
+                } else {
+                    // convert the negative num to positive by summing 1 to it's 2 complement
+                    (!(self as $conv_fn)).wrapping_add(1)
+                };
+                let mut curr = buf.len() as isize;
+                let buf_ptr = buf.as_mut_ptr();
+                let lut_ptr = DEC_DIGITS_LUT.as_ptr();
+
+                unsafe {
+                    // need at least 16 bits for the 4-characters-at-a-time to work.
+                    if mem::size_of::<$t>() >= 2 {
+                        // eagerly decode 4 characters at a time
+                        while n >= 10000 {
+                            let rem = (n % 10000) as isize;
+                            n /= 10000;
+
+                            let d1 = (rem / 100) << 1;
+                            let d2 = (rem % 100) << 1;
+                            curr -= 4;
+                            ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
+                            ptr::copy_nonoverlapping(lut_ptr.offset(d2), buf_ptr.offset(curr + 2), 2);
+                        }
+                    }
+
+                    // if we reach here numbers are <= 9999, so at most 4 chars long
+                    let mut n = n as isize; // possibly reduce 64bit math
+
+                    // decode 2 more chars, if > 2 chars
+                    if n >= 100 {
+                        let d1 = (n % 100) << 1;
+                        n /= 100;
+                        curr -= 2;
+                        ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
+                    }
+
+                    // decode last 1 or 2 chars
+                    if n < 10 {
+                        curr -= 1;
+                        *buf_ptr.offset(curr) = (n as u8) + b'0';
+                    } else {
+                        let d1 = n << 1;
+                        curr -= 2;
+                        ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
+                    }
+
+                    if !is_nonnegative {
+                        curr -= 1;
+                        *buf_ptr.offset(curr) = b'-';
+                    }
+                }
+
+                let len = buf.len() - curr as usize;
+                unsafe { slice::from_raw_parts(buf_ptr.offset(curr), len) }
+            }
+        }
+    )*};
+}
+
+const I8_MAX_LEN: usize = 4;
+const U8_MAX_LEN: usize = 3;
+const I16_MAX_LEN: usize = 6;
+const U16_MAX_LEN: usize = 5;
+const I32_MAX_LEN: usize = 11;
+const U32_MAX_LEN: usize = 10;
+const I64_MAX_LEN: usize = 20;
+const U64_MAX_LEN: usize = 20;
+
+impl_Integer!(
+    I8_MAX_LEN => i8,
+    U8_MAX_LEN => u8,
+    I16_MAX_LEN => i16,
+    U16_MAX_LEN => u16,
+    I32_MAX_LEN => i32,
+    U32_MAX_LEN => u32
+    as u32);
+
+impl_Integer!(I64_MAX_LEN => i64, U64_MAX_LEN => u64 as u64);
+
+#[cfg(target_pointer_width = "16")]
+impl_Integer!(I16_MAX_LEN => isize, U16_MAX_LEN => usize as u16);
+
+#[cfg(target_pointer_width = "32")]
+impl_Integer!(I32_MAX_LEN => isize, U32_MAX_LEN => usize as u32);
+
+#[cfg(target_pointer_width = "64")]
+impl_Integer!(I64_MAX_LEN => isize, U64_MAX_LEN => usize as u64);
+
+#[cfg(all(feature = "i128"))]
+macro_rules! impl_Integer128 {
+    ($($max_len:expr => $t:ident),*) => {$(
+        impl_IntegerCommon!($max_len, $t);
+
+        impl IntegerPrivate<[u8; $max_len]> for $t {
+            #[allow(unused_comparisons)]
+            #[inline]
+            fn write_to(self, buf: &mut [u8; $max_len]) -> &[u8] {
+                let is_nonnegative = self >= 0;
+                let n = if is_nonnegative {
+                    self as u128
+                } else {
+                    // convert the negative num to positive by summing 1 to it's 2 complement
+                    (!(self as u128)).wrapping_add(1)
+                };
+                let mut curr = buf.len() as isize;
+                let buf_ptr = buf.as_mut_ptr();
+
+                unsafe {
+                    // Divide by 10^19 which is the highest power less than 2^64.
+                    let (n, rem) = udiv128::udivmod_1e19(n);
+                    let buf1 = buf_ptr.offset(curr - U64_MAX_LEN as isize) as *mut [u8; U64_MAX_LEN];
+                    curr -= rem.write_to(&mut *buf1).len() as isize;
+
+                    if n != 0 {
+                        // Memset the base10 leading zeros of rem.
+                        let target = buf.len() as isize - 19;
+                        ptr::write_bytes(buf_ptr.offset(target), b'0', (curr - target) as usize);
+                        curr = target;
+
+                        // Divide by 10^19 again.
+                        let (n, rem) = udiv128::udivmod_1e19(n);
+                        let buf2 = buf_ptr.offset(curr - U64_MAX_LEN as isize) as *mut [u8; U64_MAX_LEN];
+                        curr -= rem.write_to(&mut *buf2).len() as isize;
+
+                        if n != 0 {
+                            // Memset the leading zeros.
+                            let target = buf.len() as isize - 38;
+                            ptr::write_bytes(buf_ptr.offset(target), b'0', (curr - target) as usize);
+                            curr = target;
+
+                            // There is at most one digit left
+                            // because u128::max / 10^19 / 10^19 is 3.
+                            curr -= 1;
+                            *buf_ptr.offset(curr) = (n as u8) + b'0';
+                        }
+                    }
+
+                    if !is_nonnegative {
+                        curr -= 1;
+                        *buf_ptr.offset(curr) = b'-';
+                    }
+
+                    let len = buf.len() - curr as usize;
+                    slice::from_raw_parts(buf_ptr.offset(curr), len)
+                }
+            }
+        }
+    )*};
+}
+
+#[cfg(all(feature = "i128"))]
+const U128_MAX_LEN: usize = 39;
+const I128_MAX_LEN: usize = 40;
+
+#[cfg(all(feature = "i128"))]
+impl_Integer128!(I128_MAX_LEN => i128, U128_MAX_LEN => u128);
diff --git a/third_party/rust/itoa/src/udiv128.rs b/third_party/rust/itoa/src/udiv128.rs
new file mode 100644
index 0000000000..adbdce2272
--- /dev/null
+++ b/third_party/rust/itoa/src/udiv128.rs
@@ -0,0 +1,61 @@
+// The code in this file is based on Rust's compiler-builtins crate. The Rust
+// compiler automatically links programs against this crate for target-specific
+// runtime support. We have copied the implementation of `__udivmodti4()` which
+// is an intrinsic implementing division with remainder for architectures
+// without 128-bit integers. This implementation works around some poor codegen
+// by LLVM (https://github.com/rust-lang/rust/issues/44545) and allows for
+// inlining which does not happen with the intrinsic.
+//
+// The compiler-builtins crate carries the following license, which is available
+// in full at:
+// https://github.com/rust-lang-nursery/compiler-builtins/blob/master/LICENSE.TXT
+//
+// ---
+//
+// Copyright 2009-2016 compiler-builtins Developers
+//
+// The compiler-builtins crate is dual licensed under both the University of
+// Illinois "BSD-Like" license and the MIT license. As a user of this code you
+// may choose to use it under either license. As a contributor, you agree to
+// allow your code to be used under both.
+
+#[inline]
+pub fn udivmod_1e19(n: u128) -> (u128, u64) {
+    let d = 10_000_000_000_000_000_000_u64; // 10^19
+
+    let high = (n >> 64) as u64;
+    if high == 0 {
+        let low = n as u64;
+        return ((low / d) as u128, low % d);
+    }
+
+    let sr = 65 - high.leading_zeros();
+
+    // 2 <= sr <= 65
+    let mut q: u128 = n << (128 - sr);
+    let mut r: u128 = n >> sr;
+    let mut carry: u64 = 0;
+
+    // Don't use a range because they may generate references to memcpy in unoptimized code
+    //
+    // Loop invariants:  r < d; carry is 0 or 1
+    let mut i = 0;
+    while i < sr {
+        i += 1;
+
+        // r:q = ((r:q) << 1) | carry
+        r = (r << 1) | (q >> 127);
+        q = (q << 1) | carry as u128;
+
+        // carry = 0
+        // if r >= d {
+        //     r -= d;
+        //     carry = 1;
+        // }
+        let s = (d as u128).wrapping_sub(r).wrapping_sub(1) as i128 >> 127;
+        carry = (s & 1) as u64;
+        r -= (d as u128) & s as u128;
+    }
+
+    ((q << 1) | carry as u128, r as u64)
+}