chore: update `bytes` dependency to git master (#1796)

Tokio will track changes to bytes until 0.5 is released.

2 files changed, 4 insertions, 131 deletions

diff --git a/tokio/src/net/tcp/split.rs b/tokio/src/net/tcp/split.rs
index 07c7c3ff..2b337c08 100644
--- a/tokio/src/net/tcp/split.rs
+++ b/tokio/src/net/tcp/split.rs
@@ -11,8 +11,8 @@
 use crate::io::{AsyncRead, AsyncWrite};
 use crate::net::TcpStream;
 
-use bytes::{Buf, BufMut};
 use std::io;
+use std::mem::MaybeUninit;
 use std::net::Shutdown;
 use std::pin::Pin;
 use std::task::{Context, Poll};
@@ -33,7 +33,7 @@ pub(crate) fn split(stream: &mut TcpStream) -> (ReadHalf<'_>, WriteHalf<'_>) {
 }
 
 impl AsyncRead for ReadHalf<'_> {
-    unsafe fn prepare_uninitialized_buffer(&self, _: &mut [u8]) -> bool {
+    unsafe fn prepare_uninitialized_buffer(&self, _: &mut [MaybeUninit<u8>]) -> bool {
         false
     }
 
@@ -44,14 +44,6 @@ impl AsyncRead for ReadHalf<'_> {
     ) -> Poll<io::Result<usize>> {
         self.0.poll_read_priv(cx, buf)
     }
-
-    fn poll_read_buf<B: BufMut>(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        self.0.poll_read_buf_priv(cx, buf)
-    }
 }
 
 impl AsyncWrite for WriteHalf<'_> {
@@ -73,14 +65,6 @@ impl AsyncWrite for WriteHalf<'_> {
     fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
         self.0.shutdown(Shutdown::Write).into()
     }
-
-    fn poll_write_buf<B: Buf>(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        self.0.poll_write_buf_priv(cx, buf)
-    }
 }
 
 impl AsRef<TcpStream> for ReadHalf<'_> {
diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs
index b73114b4..34d3a493 100644
--- a/tokio/src/net/tcp/stream.rs
+++ b/tokio/src/net/tcp/stream.rs
@@ -3,11 +3,10 @@ use crate::io::{AsyncRead, AsyncWrite, PollEvented};
 use crate::net::tcp::split::{split, ReadHalf, WriteHalf};
 use crate::net::ToSocketAddrs;
 
-use bytes::{Buf, BufMut};
-use iovec::IoVec;
 use std::convert::TryFrom;
 use std::fmt;
 use std::io::{self, Read, Write};
+use std::mem::MaybeUninit;
 use std::net::{self, Shutdown, SocketAddr};
 use std::pin::Pin;
 use std::task::{Context, Poll};
@@ -601,70 +600,6 @@ impl TcpStream {
         }
     }
 
-    pub(crate) fn poll_read_buf_priv<B: BufMut>(
-        &self,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        ready!(self.io.poll_read_ready(cx, mio::Ready::readable()))?;
-
-        let r = unsafe {
-            // The `IoVec` type can't have a 0-length size, so we create a bunch
-            // of dummy versions on the stack with 1 length which we'll quickly
-            // overwrite.
-            let b1: &mut [u8] = &mut [0];
-            let b2: &mut [u8] = &mut [0];
-            let b3: &mut [u8] = &mut [0];
-            let b4: &mut [u8] = &mut [0];
-            let b5: &mut [u8] = &mut [0];
-            let b6: &mut [u8] = &mut [0];
-            let b7: &mut [u8] = &mut [0];
-            let b8: &mut [u8] = &mut [0];
-            let b9: &mut [u8] = &mut [0];
-            let b10: &mut [u8] = &mut [0];
-            let b11: &mut [u8] = &mut [0];
-            let b12: &mut [u8] = &mut [0];
-            let b13: &mut [u8] = &mut [0];
-            let b14: &mut [u8] = &mut [0];
-            let b15: &mut [u8] = &mut [0];
-            let b16: &mut [u8] = &mut [0];
-            let mut bufs: [&mut IoVec; 16] = [
-                b1.into(),
-                b2.into(),
-                b3.into(),
-                b4.into(),
-                b5.into(),
-                b6.into(),
-                b7.into(),
-                b8.into(),
-                b9.into(),
-                b10.into(),
-                b11.into(),
-                b12.into(),
-                b13.into(),
-                b14.into(),
-                b15.into(),
-                b16.into(),
-            ];
-            let n = buf.bytes_vec_mut(&mut bufs);
-            self.io.get_ref().read_bufs(&mut bufs[..n])
-        };
-
-        match r {
-            Ok(n) => {
-                unsafe {
-                    buf.advance_mut(n);
-                }
-                Poll::Ready(Ok(n))
-            }
-            Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
-                self.io.clear_read_ready(cx, mio::Ready::readable())?;
-                Poll::Pending
-            }
-            Err(e) => Poll::Ready(Err(e)),
-        }
-    }
-
     pub(crate) fn poll_write_priv(
         &self,
         cx: &mut Context<'_>,
@@ -680,36 +615,6 @@ impl TcpStream {
             x => Poll::Ready(x),
         }
     }
-
-    pub(crate) fn poll_write_buf_priv<B: Buf>(
-        &self,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        ready!(self.io.poll_write_ready(cx))?;
-
-        let r = {
-            // The `IoVec` type can't have a zero-length size, so create a dummy
-            // version from a 1-length slice which we'll overwrite with the
-            // `bytes_vec` method.
-            static DUMMY: &[u8] = &[0];
-            let iovec = <&IoVec>::from(DUMMY);
-            let mut bufs = [iovec; 64];
-            let n = buf.bytes_vec(&mut bufs);
-            self.io.get_ref().write_bufs(&bufs[..n])
-        };
-        match r {
-            Ok(n) => {
-                buf.advance(n);
-                Poll::Ready(Ok(n))
-            }
-            Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
-                self.io.clear_write_ready(cx)?;
-                Poll::Pending
-            }
-            Err(e) => Poll::Ready(Err(e)),
-        }
-    }
 }
 
 impl TryFrom<TcpStream> for mio::net::TcpStream {
@@ -741,7 +646,7 @@ impl TryFrom<net::TcpStream> for TcpStream {
 // ===== impl Read / Write =====
 
 impl AsyncRead for TcpStream {
-    unsafe fn prepare_uninitialized_buffer(&self, _: &mut [u8]) -> bool {
+    unsafe fn prepare_uninitialized_buffer(&self, _: &mut [MaybeUninit<u8>]) -> bool {
         false
     }
 
@@ -752,14 +657,6 @@ impl AsyncRead for TcpStream {
     ) -> Poll<io::Result<usize>> {
         self.poll_read_priv(cx, buf)
     }
-
-    fn poll_read_buf<B: BufMut>(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        self.poll_read_buf_priv(cx, buf)
-    }
 }
 
 impl AsyncWrite for TcpStream {
@@ -781,14 +678,6 @@ impl AsyncWrite for TcpStream {
         self.shutdown(std::net::Shutdown::Write)?;
         Poll::Ready(Ok(()))
     }
-
-    fn poll_write_buf<B: Buf>(
-        self: Pin<&mut Self>,
-        cx: &mut Context<'_>,
-        buf: &mut B,
-    ) -> Poll<io::Result<usize>> {
-        self.poll_write_buf_priv(cx, buf)
-    }
 }
 
 impl fmt::Debug for TcpStream {