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Make rustc_index::bit_set available on stable

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This commit is contained in:
Nadrieril 2023-12-11 21:52:56 +01:00
parent e646c9f723
commit f30c5956f5
2 changed files with 37 additions and 12 deletions
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48
compiler/rustc_index/src/bit_set.rs
View File

@ -9,6 +9,7 @@ use std::slice;
use arrayvec::ArrayVec;
use smallvec::{smallvec, SmallVec};
#[cfg(feature = "nightly")]
use rustc_macros::{Decodable, Encodable};
use crate::{Idx, IndexVec};
@ -111,7 +112,8 @@ macro_rules! bit_relations_inherent_impls {
/// to or greater than the domain size. All operations that involve two bitsets
/// will panic if the bitsets have differing domain sizes.
///
#[derive(Eq, PartialEq, Hash, Decodable, Encodable)]
#[cfg_attr(feature = "nightly", derive(Decodable, Encodable))]
#[derive(Eq, PartialEq, Hash)]
pub struct BitSet<T> {
domain_size: usize,
words: SmallVec<[Word; 2]>,
@ -491,10 +493,21 @@ impl<T: Idx> ChunkedBitSet<T> {
match *chunk {
Zeros(chunk_domain_size) => {
if chunk_domain_size > 1 {
// We take some effort to avoid copying the words.
let words = Rc::<[Word; CHUNK_WORDS]>::new_zeroed();
// SAFETY: `words` can safely be all zeroes.
let mut words = unsafe { words.assume_init() };
#[cfg(feature = "nightly")]
let mut words = {
// We take some effort to avoid copying the words.
let words = Rc::<[Word; CHUNK_WORDS]>::new_zeroed();
// SAFETY: `words` can safely be all zeroes.
unsafe { words.assume_init() }
};
#[cfg(not(feature = "nightly"))]
let mut words = {
let words = mem::MaybeUninit::<[Word; CHUNK_WORDS]>::zeroed();
// SAFETY: `words` can safely be all zeroes.
let words = unsafe { words.assume_init() };
// Unfortunate possibly-large copy
Rc::new(words)
};
let words_ref = Rc::get_mut(&mut words).unwrap();
let (word_index, mask) = chunk_word_index_and_mask(elem);
@ -545,10 +558,21 @@ impl<T: Idx> ChunkedBitSet<T> {
Zeros(_) => false,
Ones(chunk_domain_size) => {
if chunk_domain_size > 1 {
// We take some effort to avoid copying the words.
let words = Rc::<[Word; CHUNK_WORDS]>::new_zeroed();
// SAFETY: `words` can safely be all zeroes.
let mut words = unsafe { words.assume_init() };
#[cfg(feature = "nightly")]
let mut words = {
// We take some effort to avoid copying the words.
let words = Rc::<[Word; CHUNK_WORDS]>::new_zeroed();
// SAFETY: `words` can safely be all zeroes.
unsafe { words.assume_init() }
};
#[cfg(not(feature = "nightly"))]
let mut words = {
let words = mem::MaybeUninit::<[Word; CHUNK_WORDS]>::zeroed();
// SAFETY: `words` can safely be all zeroes.
let words = unsafe { words.assume_init() };
// Unfortunate possibly-large copy
Rc::new(words)
};
let words_ref = Rc::get_mut(&mut words).unwrap();
// Set only the bits in use.
@ -1564,7 +1588,8 @@ impl<T: Idx> From<BitSet<T>> for GrowableBitSet<T> {
///
/// All operations that involve a row and/or column index will panic if the
/// index exceeds the relevant bound.
#[derive(Clone, Eq, PartialEq, Hash, Decodable, Encodable)]
#[cfg_attr(feature = "nightly", derive(Decodable, Encodable))]
#[derive(Clone, Eq, PartialEq, Hash)]
pub struct BitMatrix<R: Idx, C: Idx> {
num_rows: usize,
num_columns: usize,
@ -1993,7 +2018,8 @@ impl std::fmt::Debug for FiniteBitSet<u32> {
/// A fixed-sized bitset type represented by an integer type. Indices outwith than the range
/// representable by `T` are considered set.
#[derive(Copy, Clone, Eq, PartialEq, Decodable, Encodable)]
#[cfg_attr(feature = "nightly", derive(Decodable, Encodable))]
#[derive(Copy, Clone, Eq, PartialEq)]
pub struct FiniteBitSet<T: FiniteBitSetTy>(pub T);
impl<T: FiniteBitSetTy> FiniteBitSet<T> {

1
compiler/rustc_index/src/lib.rs
View File

@ -14,7 +14,6 @@
)]
#![cfg_attr(feature = "nightly", allow(internal_features))]
#[cfg(feature = "nightly")]
pub mod bit_set;
#[cfg(feature = "nightly")]
pub mod interval;