Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 342 insertions, 0 deletions

diff --git a/third_party/rust/rayon/src/iter/panic_fuse.rs b/third_party/rust/rayon/src/iter/panic_fuse.rs
new file mode 100644
index 0000000000..7487230e57
--- /dev/null
+++ b/third_party/rust/rayon/src/iter/panic_fuse.rs
@@ -0,0 +1,342 @@
+use super::plumbing::*;
+use super::*;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::thread;
+
+/// `PanicFuse` is an adaptor that wraps an iterator with a fuse in case
+/// of panics, to halt all threads as soon as possible.
+///
+/// This struct is created by the [`panic_fuse()`] method on [`ParallelIterator`]
+///
+/// [`panic_fuse()`]: trait.ParallelIterator.html#method.panic_fuse
+/// [`ParallelIterator`]: trait.ParallelIterator.html
+#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[derive(Debug, Clone)]
+pub struct PanicFuse<I: ParallelIterator> {
+    base: I,
+}
+
+/// Helper that sets a bool to `true` if dropped while unwinding.
+#[derive(Clone)]
+struct Fuse<'a>(&'a AtomicBool);
+
+impl<'a> Drop for Fuse<'a> {
+    #[inline]
+    fn drop(&mut self) {
+        if thread::panicking() {
+            self.0.store(true, Ordering::Relaxed);
+        }
+    }
+}
+
+impl<'a> Fuse<'a> {
+    #[inline]
+    fn panicked(&self) -> bool {
+        self.0.load(Ordering::Relaxed)
+    }
+}
+
+impl<I> PanicFuse<I>
+where
+    I: ParallelIterator,
+{
+    /// Creates a new `PanicFuse` iterator.
+    pub(super) fn new(base: I) -> PanicFuse<I> {
+        PanicFuse { base }
+    }
+}
+
+impl<I> ParallelIterator for PanicFuse<I>
+where
+    I: ParallelIterator,
+{
+    type Item = I::Item;
+
+    fn drive_unindexed<C>(self, consumer: C) -> C::Result
+    where
+        C: UnindexedConsumer<Self::Item>,
+    {
+        let panicked = AtomicBool::new(false);
+        let consumer1 = PanicFuseConsumer {
+            base: consumer,
+            fuse: Fuse(&panicked),
+        };
+        self.base.drive_unindexed(consumer1)
+    }
+
+    fn opt_len(&self) -> Option<usize> {
+        self.base.opt_len()
+    }
+}
+
+impl<I> IndexedParallelIterator for PanicFuse<I>
+where
+    I: IndexedParallelIterator,
+{
+    fn drive<C>(self, consumer: C) -> C::Result
+    where
+        C: Consumer<Self::Item>,
+    {
+        let panicked = AtomicBool::new(false);
+        let consumer1 = PanicFuseConsumer {
+            base: consumer,
+            fuse: Fuse(&panicked),
+        };
+        self.base.drive(consumer1)
+    }
+
+    fn len(&self) -> usize {
+        self.base.len()
+    }
+
+    fn with_producer<CB>(self, callback: CB) -> CB::Output
+    where
+        CB: ProducerCallback<Self::Item>,
+    {
+        return self.base.with_producer(Callback { callback });
+
+        struct Callback<CB> {
+            callback: CB,
+        }
+
+        impl<T, CB> ProducerCallback<T> for Callback<CB>
+        where
+            CB: ProducerCallback<T>,
+        {
+            type Output = CB::Output;
+
+            fn callback<P>(self, base: P) -> CB::Output
+            where
+                P: Producer<Item = T>,
+            {
+                let panicked = AtomicBool::new(false);
+                let producer = PanicFuseProducer {
+                    base,
+                    fuse: Fuse(&panicked),
+                };
+                self.callback.callback(producer)
+            }
+        }
+    }
+}
+
+/// ////////////////////////////////////////////////////////////////////////
+/// Producer implementation
+
+struct PanicFuseProducer<'a, P> {
+    base: P,
+    fuse: Fuse<'a>,
+}
+
+impl<'a, P> Producer for PanicFuseProducer<'a, P>
+where
+    P: Producer,
+{
+    type Item = P::Item;
+    type IntoIter = PanicFuseIter<'a, P::IntoIter>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        PanicFuseIter {
+            base: self.base.into_iter(),
+            fuse: self.fuse,
+        }
+    }
+
+    fn min_len(&self) -> usize {
+        self.base.min_len()
+    }
+    fn max_len(&self) -> usize {
+        self.base.max_len()
+    }
+
+    fn split_at(self, index: usize) -> (Self, Self) {
+        let (left, right) = self.base.split_at(index);
+        (
+            PanicFuseProducer {
+                base: left,
+                fuse: self.fuse.clone(),
+            },
+            PanicFuseProducer {
+                base: right,
+                fuse: self.fuse,
+            },
+        )
+    }
+
+    fn fold_with<G>(self, folder: G) -> G
+    where
+        G: Folder<Self::Item>,
+    {
+        let folder1 = PanicFuseFolder {
+            base: folder,
+            fuse: self.fuse,
+        };
+        self.base.fold_with(folder1).base
+    }
+}
+
+struct PanicFuseIter<'a, I> {
+    base: I,
+    fuse: Fuse<'a>,
+}
+
+impl<'a, I> Iterator for PanicFuseIter<'a, I>
+where
+    I: Iterator,
+{
+    type Item = I::Item;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.fuse.panicked() {
+            None
+        } else {
+            self.base.next()
+        }
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.base.size_hint()
+    }
+}
+
+impl<'a, I> DoubleEndedIterator for PanicFuseIter<'a, I>
+where
+    I: DoubleEndedIterator,
+{
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.fuse.panicked() {
+            None
+        } else {
+            self.base.next_back()
+        }
+    }
+}
+
+impl<'a, I> ExactSizeIterator for PanicFuseIter<'a, I>
+where
+    I: ExactSizeIterator,
+{
+    fn len(&self) -> usize {
+        self.base.len()
+    }
+}
+
+/// ////////////////////////////////////////////////////////////////////////
+/// Consumer implementation
+
+struct PanicFuseConsumer<'a, C> {
+    base: C,
+    fuse: Fuse<'a>,
+}
+
+impl<'a, T, C> Consumer<T> for PanicFuseConsumer<'a, C>
+where
+    C: Consumer<T>,
+{
+    type Folder = PanicFuseFolder<'a, C::Folder>;
+    type Reducer = PanicFuseReducer<'a, C::Reducer>;
+    type Result = C::Result;
+
+    fn split_at(self, index: usize) -> (Self, Self, Self::Reducer) {
+        let (left, right, reducer) = self.base.split_at(index);
+        (
+            PanicFuseConsumer {
+                base: left,
+                fuse: self.fuse.clone(),
+            },
+            PanicFuseConsumer {
+                base: right,
+                fuse: self.fuse.clone(),
+            },
+            PanicFuseReducer {
+                base: reducer,
+                _fuse: self.fuse,
+            },
+        )
+    }
+
+    fn into_folder(self) -> Self::Folder {
+        PanicFuseFolder {
+            base: self.base.into_folder(),
+            fuse: self.fuse,
+        }
+    }
+
+    fn full(&self) -> bool {
+        self.fuse.panicked() || self.base.full()
+    }
+}
+
+impl<'a, T, C> UnindexedConsumer<T> for PanicFuseConsumer<'a, C>
+where
+    C: UnindexedConsumer<T>,
+{
+    fn split_off_left(&self) -> Self {
+        PanicFuseConsumer {
+            base: self.base.split_off_left(),
+            fuse: self.fuse.clone(),
+        }
+    }
+
+    fn to_reducer(&self) -> Self::Reducer {
+        PanicFuseReducer {
+            base: self.base.to_reducer(),
+            _fuse: self.fuse.clone(),
+        }
+    }
+}
+
+struct PanicFuseFolder<'a, C> {
+    base: C,
+    fuse: Fuse<'a>,
+}
+
+impl<'a, T, C> Folder<T> for PanicFuseFolder<'a, C>
+where
+    C: Folder<T>,
+{
+    type Result = C::Result;
+
+    fn consume(mut self, item: T) -> Self {
+        self.base = self.base.consume(item);
+        self
+    }
+
+    fn consume_iter<I>(mut self, iter: I) -> Self
+    where
+        I: IntoIterator<Item = T>,
+    {
+        fn cool<'a, T>(fuse: &'a Fuse<'_>) -> impl Fn(&T) -> bool + 'a {
+            move |_| !fuse.panicked()
+        }
+
+        self.base = {
+            let fuse = &self.fuse;
+            let iter = iter.into_iter().take_while(cool(fuse));
+            self.base.consume_iter(iter)
+        };
+        self
+    }
+
+    fn complete(self) -> C::Result {
+        self.base.complete()
+    }
+
+    fn full(&self) -> bool {
+        self.fuse.panicked() || self.base.full()
+    }
+}
+
+struct PanicFuseReducer<'a, C> {
+    base: C,
+    _fuse: Fuse<'a>,
+}
+
+impl<'a, T, C> Reducer<T> for PanicFuseReducer<'a, C>
+where
+    C: Reducer<T>,
+{
+    fn reduce(self, left: T, right: T) -> T {
+        self.base.reduce(left, right)
+    }
+}