441dc3640a
Found with https://github.com/est31/warnalyzer. Dubious changes: - Is anyone else using rustc_apfloat? I feel weird completely deleting x87 support. - Maybe some of the dead code in rustc_data_structures, in case someone wants to use it in the future? - Don't change rustc_serialize I plan to scrap most of the json module in the near future (see https://github.com/rust-lang/compiler-team/issues/418) and fixing the tests needed more work than I expected. TODO: check if any of the comments on the deleted code should be kept.
45 lines
1.4 KiB
Rust
45 lines
1.4 KiB
Rust
use rustc_index::bit_set::BitSet;
|
|
use rustc_index::vec::Idx;
|
|
use std::collections::VecDeque;
|
|
|
|
/// A work queue is a handy data structure for tracking work left to
|
|
/// do. (For example, basic blocks left to process.) It is basically a
|
|
/// de-duplicating queue; so attempting to insert X if X is already
|
|
/// enqueued has no effect. This implementation assumes that the
|
|
/// elements are dense indices, so it can allocate the queue to size
|
|
/// and also use a bit set to track occupancy.
|
|
pub struct WorkQueue<T: Idx> {
|
|
deque: VecDeque<T>,
|
|
set: BitSet<T>,
|
|
}
|
|
|
|
impl<T: Idx> WorkQueue<T> {
|
|
/// Creates a new work queue that starts empty, where elements range from (0..len).
|
|
#[inline]
|
|
pub fn with_none(len: usize) -> Self {
|
|
WorkQueue { deque: VecDeque::with_capacity(len), set: BitSet::new_empty(len) }
|
|
}
|
|
|
|
/// Attempt to enqueue `element` in the work queue. Returns false if it was already present.
|
|
#[inline]
|
|
pub fn insert(&mut self, element: T) -> bool {
|
|
if self.set.insert(element) {
|
|
self.deque.push_back(element);
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
/// Attempt to pop an element from the work queue.
|
|
#[inline]
|
|
pub fn pop(&mut self) -> Option<T> {
|
|
if let Some(element) = self.deque.pop_front() {
|
|
self.set.remove(element);
|
|
Some(element)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
}
|