Merging upstream version 1.73.0+dfsg1.

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

4 files changed, 42 insertions, 12 deletions

diff --git a/library/std/src/sys_common/backtrace.rs b/library/std/src/sys_common/backtrace.rs
index 6f020940d..84e2c5d8d 100644
--- a/library/std/src/sys_common/backtrace.rs
+++ b/library/std/src/sys_common/backtrace.rs
@@ -60,6 +60,8 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
     bt_fmt.add_context()?;
     let mut idx = 0;
     let mut res = Ok(());
+    let mut omitted_count: usize = 0;
+    let mut first_omit = true;
     // Start immediately if we're not using a short backtrace.
     let mut start = print_fmt != PrintFmt::Short;
     backtrace_rs::trace_unsynchronized(|frame| {
@@ -85,10 +87,27 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
                         start = true;
                         return;
                     }
+                    if !start {
+                        omitted_count += 1;
+                    }
                 }
             }
 
             if start {
+                if omitted_count > 0 {
+                    debug_assert!(print_fmt == PrintFmt::Short);
+                    // only print the message between the middle of frames
+                    if !first_omit {
+                        let _ = writeln!(
+                            bt_fmt.formatter(),
+                            "      [... omitted {} frame{} ...]",
+                            omitted_count,
+                            if omitted_count > 1 { "s" } else { "" }
+                        );
+                    }
+                    first_omit = false;
+                    omitted_count = 0;
+                }
                 res = bt_fmt.frame().symbol(frame, symbol);
             }
         });
diff --git a/library/std/src/sys_common/thread_info.rs b/library/std/src/sys_common/thread_info.rs
index 38c9e5000..88d937a7d 100644
--- a/library/std/src/sys_common/thread_info.rs
+++ b/library/std/src/sys_common/thread_info.rs
@@ -1,5 +1,4 @@
 #![allow(dead_code)] // stack_guard isn't used right now on all platforms
-#![allow(unused_unsafe)] // thread_local with `const {}` triggers this liny
 
 use crate::cell::RefCell;
 use crate::sys::thread::guard::Guard;
diff --git a/library/std/src/sys_common/thread_parking/id.rs b/library/std/src/sys_common/thread_parking/id.rs
index 15042fc3b..046674396 100644
--- a/library/std/src/sys_common/thread_parking/id.rs
+++ b/library/std/src/sys_common/thread_parking/id.rs
@@ -56,18 +56,14 @@ impl Parker {
         self.init_tid();
 
         // Changes NOTIFIED to EMPTY and EMPTY to PARKED.
-        let mut state = self.state.fetch_sub(1, Acquire).wrapping_sub(1);
-        if state == PARKED {
+        let state = self.state.fetch_sub(1, Acquire);
+        if state == EMPTY {
             // Loop to guard against spurious wakeups.
-            while state == PARKED {
+            // The state must be reset with acquire ordering to ensure that all
+            // calls to `unpark` synchronize with this thread.
+            while self.state.compare_exchange(NOTIFIED, EMPTY, Acquire, Relaxed).is_err() {
                 park(self.state.as_ptr().addr());
-                state = self.state.load(Acquire);
             }
-
-            // Since the state change has already been observed with acquire
-            // ordering, the state can be reset with a relaxed store instead
-            // of a swap.
-            self.state.store(EMPTY, Relaxed);
         }
     }
 
@@ -78,8 +74,7 @@ impl Parker {
         if state == PARKED {
             park_timeout(dur, self.state.as_ptr().addr());
             // Swap to ensure that we observe all state changes with acquire
-            // ordering, even if the state has been changed after the timeout
-            // occurred.
+            // ordering.
             self.state.swap(EMPTY, Acquire);
         }
     }
diff --git a/library/std/src/sys_common/wtf8.rs b/library/std/src/sys_common/wtf8.rs
index c9d3e13cf..67db5ebd8 100644
--- a/library/std/src/sys_common/wtf8.rs
+++ b/library/std/src/sys_common/wtf8.rs
@@ -182,6 +182,15 @@ impl Wtf8Buf {
         Wtf8Buf { bytes: Vec::with_capacity(capacity), is_known_utf8: true }
     }
 
+    /// Creates a WTF-8 string from a WTF-8 byte vec.
+    ///
+    /// Since the byte vec is not checked for valid WTF-8, this functions is
+    /// marked unsafe.
+    #[inline]
+    pub unsafe fn from_bytes_unchecked(value: Vec<u8>) -> Wtf8Buf {
+        Wtf8Buf { bytes: value, is_known_utf8: false }
+    }
+
     /// Creates a WTF-8 string from a UTF-8 `String`.
     ///
     /// This takes ownership of the `String` and does not copy.
@@ -402,6 +411,12 @@ impl Wtf8Buf {
         self.bytes.truncate(new_len)
     }
 
+    /// Consumes the WTF-8 string and tries to convert it to a vec of bytes.
+    #[inline]
+    pub fn into_bytes(self) -> Vec<u8> {
+        self.bytes
+    }
+
     /// Consumes the WTF-8 string and tries to convert it to UTF-8.
     ///
     /// This does not copy the data.
@@ -444,6 +459,7 @@ impl Wtf8Buf {
     /// Converts this `Wtf8Buf` into a boxed `Wtf8`.
     #[inline]
     pub fn into_box(self) -> Box<Wtf8> {
+        // SAFETY: relies on `Wtf8` being `repr(transparent)`.
         unsafe { mem::transmute(self.bytes.into_boxed_slice()) }
     }
 
@@ -496,6 +512,7 @@ impl Extend<CodePoint> for Wtf8Buf {
 /// Similar to `&str`, but can additionally contain surrogate code points
 /// if they’re not in a surrogate pair.
 #[derive(Eq, Ord, PartialEq, PartialOrd)]
+#[repr(transparent)]
 pub struct Wtf8 {
     bytes: [u8],
 }