Unrolled build for rust-lang#135696

Rollup merge of rust-lang#135696 - joboet:move_pal_io, r=Noratrieb

std: move `io` module out of `pal`, get rid of `sys_common::io`

Part of rust-lang#117276.

This does two related things:
1. It moves the platform-specific definitions for `IoSlice`, `IoSliceMut` and `is_terminal` out of `pal` and into `sys` and unifies some of them.
2. It gets rid of `sys_common::io`, moving the non-platform-specific test helpers into `std::test_helpers` and the buffer size definition to the new `sys::io` module.

Author: rust-timer

library/std/src/fs/tests.rs

@@ -14,7 +14,7 @@ use crate::os::unix::fs::symlink as junction_point;
 use crate::os::windows::fs::{OpenOptionsExt, junction_point, symlink_dir, symlink_file};
 use crate::path::Path;
 use crate::sync::Arc;
-use crate::sys_common::io::test::{TempDir, tmpdir};
+use crate::test_helpers::{TempDir, tmpdir};
 use crate::time::{Duration, Instant, SystemTime};
 use crate::{env, str, thread};
 

library/std/src/io/mod.rs

@@ -344,7 +344,7 @@ pub mod prelude;
 mod stdio;
 mod util;
 
-const DEFAULT_BUF_SIZE: usize = crate::sys_common::io::DEFAULT_BUF_SIZE;
+const DEFAULT_BUF_SIZE: usize = crate::sys::io::DEFAULT_BUF_SIZE;
 
 pub(crate) use stdio::cleanup;
 

library/std/src/lib.rs

@@ -739,27 +739,4 @@ mod sealed {
 
 #[cfg(test)]
 #[allow(dead_code)] // Not used in all configurations.
-pub(crate) mod test_helpers {
-    /// Test-only replacement for `rand::thread_rng()`, which is unusable for
-    /// us, as we want to allow running stdlib tests on tier-3 targets which may
-    /// not have `getrandom` support.
-    ///
-    /// Does a bit of a song and dance to ensure that the seed is different on
-    /// each call (as some tests sadly rely on this), but doesn't try that hard.
-    ///
-    /// This is duplicated in the `core`, `alloc` test suites (as well as
-    /// `std`'s integration tests), but figuring out a mechanism to share these
-    /// seems far more painful than copy-pasting a 7 line function a couple
-    /// times, given that even under a perma-unstable feature, I don't think we
-    /// want to expose types from `rand` from `std`.
-    #[track_caller]
-    pub(crate) fn test_rng() -> rand_xorshift::XorShiftRng {
-        use core::hash::{BuildHasher, Hash, Hasher};
-        let mut hasher = crate::hash::RandomState::new().build_hasher();
-        core::panic::Location::caller().hash(&mut hasher);
-        let hc64 = hasher.finish();
-        let seed_vec = hc64.to_le_bytes().into_iter().chain(0u8..8).collect::<Vec<u8>>();
-        let seed: [u8; 16] = seed_vec.as_slice().try_into().unwrap();
-        rand::SeedableRng::from_seed(seed)
-    }
-}
+pub(crate) mod test_helpers;

library/std/src/os/unix/fs/tests.rs

@@ -3,7 +3,7 @@ use super::*;
 #[test]
 fn read_vectored_at() {
     let msg = b"preadv is working!";
-    let dir = crate::sys_common::io::test::tmpdir();
+    let dir = crate::test_helpers::tmpdir();
 
     let filename = dir.join("preadv.txt");
     {
@@ -31,7 +31,7 @@ fn read_vectored_at() {
 #[test]
 fn write_vectored_at() {
     let msg = b"pwritev is not working!";
-    let dir = crate::sys_common::io::test::tmpdir();
+    let dir = crate::test_helpers::tmpdir();
 
     let filename = dir.join("preadv.txt");
     {

library/std/src/os/unix/net/tests.rs

@@ -7,7 +7,7 @@ use crate::os::android::net::{SocketAddrExt, UnixSocketExt};
 use crate::os::linux::net::{SocketAddrExt, UnixSocketExt};
 #[cfg(any(target_os = "android", target_os = "linux"))]
 use crate::os::unix::io::AsRawFd;
-use crate::sys_common::io::test::tmpdir;
+use crate::test_helpers::tmpdir;
 use crate::thread;
 use crate::time::Duration;
 

library/std/src/process/tests.rs

@@ -549,7 +549,7 @@ fn debug_print() {
 #[test]
 #[cfg(windows)]
 fn run_bat_script() {
-    let tempdir = crate::sys_common::io::test::tmpdir();
+    let tempdir = crate::test_helpers::tmpdir();
     let script_path = tempdir.join("hello.cmd");
 
     crate::fs::write(&script_path, "@echo Hello, %~1!").unwrap();
@@ -568,7 +568,7 @@ fn run_bat_script() {
 #[test]
 #[cfg(windows)]
 fn run_canonical_bat_script() {
-    let tempdir = crate::sys_common::io::test::tmpdir();
+    let tempdir = crate::test_helpers::tmpdir();
     let script_path = tempdir.join("hello.cmd");
 
     crate::fs::write(&script_path, "@echo Hello, %~1!").unwrap();

library/std/src/sys/pal/hermit/io.rs renamed to library/std/src/sys/io/io_slice/iovec.rs

@@ -1,8 +1,13 @@
-use hermit_abi::{c_void, iovec};
+#[cfg(target_os = "hermit")]
+use hermit_abi::iovec;
+#[cfg(target_family = "unix")]
+use libc::iovec;
 
+use crate::ffi::c_void;
 use crate::marker::PhantomData;
-use crate::os::hermit::io::{AsFd, AsRawFd};
 use crate::slice;
+#[cfg(target_os = "solid_asp3")]
+use crate::sys::pal::abi::sockets::iovec;
 
 #[derive(Copy, Clone)]
 #[repr(transparent)]
@@ -80,8 +85,3 @@ impl<'a> IoSliceMut<'a> {
         unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
     }
 }
-
-pub fn is_terminal(fd: &impl AsFd) -> bool {
-    let fd = fd.as_fd();
-    hermit_abi::isatty(fd.as_raw_fd())
-}

library/std/src/sys/pal/unsupported/io.rs renamed to library/std/src/sys/io/io_slice/unsupported.rs

@@ -50,7 +50,3 @@ impl<'a> IoSliceMut<'a> {
         self.0
     }
 }
-
-pub fn is_terminal<T>(_: &T) -> bool {
-    false
-}

library/std/src/sys/pal/wasi/io.rs renamed to library/std/src/sys/io/io_slice/wasi.rs

@@ -1,7 +1,4 @@
-#![forbid(unsafe_op_in_unsafe_fn)]
-
 use crate::marker::PhantomData;
-use crate::os::fd::{AsFd, AsRawFd};
 use crate::slice;
 
 #[derive(Copy, Clone)]
@@ -77,8 +74,3 @@ impl<'a> IoSliceMut<'a> {
         unsafe { slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.buf_len) }
     }
 }
-
-pub fn is_terminal(fd: &impl AsFd) -> bool {
-    let fd = fd.as_fd();
-    unsafe { libc::isatty(fd.as_raw_fd()) != 0 }
-}

library/std/src/sys/pal/solid/io.rs renamed to library/std/src/sys/io/io_slice/windows.rs

@@ -1,86 +1,82 @@
-use libc::c_void;
-
-use super::abi::sockets::iovec;
 use crate::marker::PhantomData;
 use crate::slice;
+use crate::sys::c;
 
 #[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a> {
-    vec: iovec,
+    vec: c::WSABUF,
     _p: PhantomData<&'a [u8]>,
 }
 
 impl<'a> IoSlice<'a> {
     #[inline]
     pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
+        assert!(buf.len() <= u32::MAX as usize);
         IoSlice {
-            vec: iovec { iov_base: buf.as_ptr() as *mut u8 as *mut c_void, iov_len: buf.len() },
+            vec: c::WSABUF { len: buf.len() as u32, buf: buf.as_ptr() as *mut u8 },
             _p: PhantomData,
         }
     }
 
     #[inline]
     pub fn advance(&mut self, n: usize) {
-        if self.vec.iov_len < n {
+        if (self.vec.len as usize) < n {
             panic!("advancing IoSlice beyond its length");
         }
 
         unsafe {
-            self.vec.iov_len -= n;
-            self.vec.iov_base = self.vec.iov_base.add(n);
+            self.vec.len -= n as u32;
+            self.vec.buf = self.vec.buf.add(n);
         }
     }
 
     #[inline]
     pub const fn as_slice(&self) -> &'a [u8] {
-        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+        unsafe { slice::from_raw_parts(self.vec.buf, self.vec.len as usize) }
     }
 }
 
 #[repr(transparent)]
 pub struct IoSliceMut<'a> {
-    vec: iovec,
+    vec: c::WSABUF,
     _p: PhantomData<&'a mut [u8]>,
 }
 
 impl<'a> IoSliceMut<'a> {
     #[inline]
     pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
+        assert!(buf.len() <= u32::MAX as usize);
         IoSliceMut {
-            vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() },
+            vec: c::WSABUF { len: buf.len() as u32, buf: buf.as_mut_ptr() },
             _p: PhantomData,
         }
     }
 
     #[inline]
     pub fn advance(&mut self, n: usize) {
-        if self.vec.iov_len < n {
+        if (self.vec.len as usize) < n {
             panic!("advancing IoSliceMut beyond its length");
         }
 
         unsafe {
-            self.vec.iov_len -= n;
-            self.vec.iov_base = self.vec.iov_base.add(n);
+            self.vec.len -= n as u32;
+            self.vec.buf = self.vec.buf.add(n);
         }
     }
 
     #[inline]
     pub fn as_slice(&self) -> &[u8] {
-        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+        unsafe { slice::from_raw_parts(self.vec.buf, self.vec.len as usize) }
     }
 
     #[inline]
     pub const fn into_slice(self) -> &'a mut [u8] {
-        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+        unsafe { slice::from_raw_parts_mut(self.vec.buf, self.vec.len as usize) }
     }
 
     #[inline]
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
-        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+        unsafe { slice::from_raw_parts_mut(self.vec.buf, self.vec.len as usize) }
     }
 }
-
-pub fn is_terminal<T>(_: &T) -> bool {
-    false
-}