Refactoring for new types Map and Set, renaming of DisplacementSet and its methods. Builds, not tested.
This commit is contained in:
paladin
parent
bae7248471
commit
d73227b907
3 changed files with 353 additions and 229 deletions
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@ -197,6 +197,10 @@ impl<T,C> Traverse<C> for IdNode<T> where C: Allocates<Self> {
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IdNode::traverse(next,context)
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}
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}
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fn collect(self) {
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todo!()
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}
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}
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#[derive(Clone)]
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10
src/lib.rs
10
src/lib.rs
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@ -1,2 +1,10 @@
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pub mod gc;
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pub mod map;
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pub mod map;
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#[cfg(test)]
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mod tests {
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#[test]
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fn simple() {
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}
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}
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568
src/map.rs
568
src/map.rs
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@ -18,8 +18,9 @@ Notes:
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- Values would only need to be shuffled around closer to their 'home' during a resize.
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- It is unlikely the displacement would large value without a resize amending that problem.
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*/
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use std::hash::{DefaultHasher, Hash, Hasher};
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use crate::gc::{AnyId, Id};
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use std::fmt::Debug;
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use std::hash::{DefaultHasher, Hash, Hasher};
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type Displacement = u8;
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@ -29,269 +30,380 @@ pub type Hashed = u64;
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pub type Hashed = u32;
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pub trait Equivalent<T>: Sized {
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fn matches(&self, other: &T) -> bool;
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fn matches(&self, other: &T) -> bool;
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}
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impl<T> Equivalent<T> for T
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where
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T: PartialEq,
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T: PartialEq,
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{
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fn matches(&self, other: &T) -> bool {
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self == other
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}
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fn matches(&self, other: &T) -> bool {
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self == other
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}
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}
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pub trait Hashes {
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fn hashed(&self) -> Hashed;
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fn hashed(&self) -> Hashed;
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}
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impl Hashes for &str {
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fn hashed(&self) -> Hashed {
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let mut hasher = DefaultHasher::new();
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self[..self.len().min(6)].hash(&mut hasher);
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hasher.finish() as Hashed
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}
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fn hashed(&self) -> Hashed {
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let mut hasher = DefaultHasher::new();
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self[..self.len().min(6)].hash(&mut hasher);
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hasher.finish() as Hashed
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}
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}
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impl<T> Hashes for Id<T> {
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fn hashed(&self) -> Hashed {
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let mut hasher = DefaultHasher::new();
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self.index.hash(&mut hasher);
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hasher.finish() as Hashed
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}
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fn hashed(&self) -> Hashed {
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let mut hasher = DefaultHasher::new();
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self.index.hash(&mut hasher);
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hasher.finish() as Hashed
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}
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}
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impl Hashes for AnyId {
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fn hashed(&self) -> Hashed {
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let mut hasher = DefaultHasher::new();
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self.index.hash(&mut hasher);
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hasher.finish() as Hashed
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}
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fn hashed(&self) -> Hashed {
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let mut hasher = DefaultHasher::new();
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self.index.hash(&mut hasher);
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hasher.finish() as Hashed
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}
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}
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pub trait TableEntry: Equivalent<Self> + Hashes {
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fn new_vacant() -> Self;
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fn is_vacant(&self) -> bool;
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const VACANT: Self;
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fn is_vacant(&self) -> bool;
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}
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#[derive(Debug, Clone)]
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pub struct Entry<E> {
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pub entry: E,
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home: usize,
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displacement: Displacement,
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#[derive(Debug)]
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pub struct Entry<E: TableEntry> {
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pub entry: E,
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home: usize,
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displacement: Displacement,
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}
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#[derive(Clone, Debug)]
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pub struct Map<E: TableEntry + Clone> {
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// default representing vacancy!
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pub map: Vec<Entry<E>>, // todo: make this private and use an iterator
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map_bounds: std::ops::Range<usize>,
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map_count: usize, // number of elements in table
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impl<E: TableEntry> Entry<E> {
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const VACANT: Entry<E> = Entry {
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entry: E::VACANT,
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home: 0,
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displacement: 0,
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};
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}
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impl<E: TableEntry + Clone> Map<E> {
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fn exchange_table(&mut self, len: usize) {
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let old = std::mem::replace(
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&mut self.map,
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vec![
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Entry {
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entry: E::new_vacant(),
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home: 0,
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displacement: 0,
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};
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len
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],
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);
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self.map_bounds = self.table_lower()..self.table_upper();
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for Entry { entry, .. } in old {
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if !entry.is_vacant() {
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self.set_table(entry)
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}
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}
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}
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pub fn resize_table(&mut self, len: usize) {
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self.exchange_table(len.max(self.map_count + (self.map_count / 3)));
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self.map_bounds = 0..self.table_upper();
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}
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fn table_upper(&self) -> usize {
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(self.map.len() / 4) * 3
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}
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fn table_lower(&self) -> usize {
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self.map.len() / 3
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}
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fn ensure_table(&mut self) {
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if self.map_count + 1 > self.table_upper() {
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// free space is short
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self.exchange_table((self.map.len() + 4) * 2);
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} else if self.map_count < self.table_lower() {
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// too much free space
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self.exchange_table(self.map.len() / 2)
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}
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}
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pub fn set_table(&mut self, entry: E) {
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#[cfg(feature = "assertions")]
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assert!(!entry.is_vacant());
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if !self.map_bounds.contains(&(self.map_count + 1)) {
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// make sure the table is appropriately sized
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self.ensure_table();
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}
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let range = self.map.len();
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let home = entry.hashed() as usize % range;
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if self.map[home].entry.is_vacant() {
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// attempt to place it directly in an empty space
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// INSERT
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self.map[home].home = home;
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self.map[home].entry = entry;
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self.map[home].displacement = self.map[home].displacement.max(0);
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self.map_count += 1;
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} else if self.map[home].entry.matches(&entry) {
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// attempt to replace it directly
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// REPLACE
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self.map[home].entry = entry; // home.item.soft_drop()
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} else {
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// attempt to replace it in a collided neighbour location
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for i in 1..self.map[home].displacement + 1 {
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let neighbour = &mut self.map[(home + i as usize) % range]; // todo: is mod expensive?
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if neighbour.entry.matches(&entry) {
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// found where it was displaced to
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// REPLACE
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neighbour.entry = entry;
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return;
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}
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}
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// at this point it must be added, probe to place in an empty space
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for j in self.map[home].displacement + 1..Displacement::MAX - 1 {
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let neighbour = &mut self.map[(home + j as usize) % range];
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if neighbour.entry.is_vacant() {
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// new empty slot hooray!
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// INSERT
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neighbour.entry = entry;
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neighbour.home = home;
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self.map[home].displacement = j;
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self.map_count += 1;
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return;
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}
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}
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// impossible but this still needs to be complete
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#[cfg(feature = "messages")]
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eprintln!("Large table collision, are the hashes ok?\n\tBrute-force probing...");
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let mut free: Option<usize> = None;
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for k in 0..self.map.len() {
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let neighbour = &mut self.map[k];
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if neighbour.entry.is_vacant() && free.is_none() {
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free = Some(k);
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} else if neighbour.entry.matches(&entry) {
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// REPLACE
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neighbour.entry = entry;
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return;
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}
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}
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if let Some(k) = free {
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// INSERT
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self.map[k].home = home;
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self.map[k].entry = entry;
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self.map[home].displacement = Displacement::MAX;
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self.map_count += 1;
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return;
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}
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// must resize
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#[cfg(feature = "messages")]
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eprintln!("\n\tResizing...");
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self.resize_table((self.map.len() + 4) * 2);
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self.set_table(entry);
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}
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}
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pub fn rem_table<K>(&mut self, index: K)
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where
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E: Equivalent<K>,
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K: Hashes,
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{
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if self.map.len() == 0 {
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return;
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}
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let range = self.map.len();
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let home = index.hashed() as usize % range;
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if self.map[home].entry.matches(&index) {
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self.map[home].entry = E::new_vacant();
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self.map_count -= 1;
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} else {
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if self.map[home].displacement != Displacement::MAX {
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let mut largest = 0;
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for i in 1..self.map[home].displacement {
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let neighbour = &mut self.map[(home + i as usize) % range]; // todo: maybe mod slows this down
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if neighbour.entry.matches(&index) {
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neighbour.entry = E::new_vacant();
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self.map_count -= 1;
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if i == self.map[home].displacement {
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self.map[home].displacement = largest
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#[derive(Debug)]
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pub struct DisplacementSet<E: TableEntry> {
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// default representing vacancy!
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pub map: Vec<Entry<E>>, // todo: make this private and use an iterator
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map_bounds: std::ops::Range<usize>,
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map_count: usize, // number of elements in table
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}
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impl<E: TableEntry> DisplacementSet<E> {
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fn exchange(&mut self, len: usize) {
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let old = std::mem::replace(
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&mut self.map,
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(0..len).map(|_| Entry::VACANT).collect(), // todo: I don't like that this may go over all memory
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);
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self.map_bounds = self.lower()..self.upper();
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for Entry { entry, .. } in old {
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if !entry.is_vacant() {
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self.set(entry)
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}
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return;
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} else if !neighbour.entry.is_vacant() && neighbour.home == home {
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largest = i;
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}
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}
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} else {
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let mut largest = 0;
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}
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pub fn resize(&mut self, len: usize) {
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self.exchange(len.max(self.map_count + (self.map_count / 3)));
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self.map_bounds = 0..self.upper();
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}
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fn upper(&self) -> usize {
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(self.map.len() / 4) * 3
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}
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fn lower(&self) -> usize {
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self.map.len() / 3
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}
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fn ensure(&mut self) {
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if self.map_count + 1 > self.upper() {
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// free space is short
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self.exchange((self.map.len() + 4) * 2);
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} else if self.map_count < self.lower() {
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// too much free space
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self.exchange(self.map.len() / 2)
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}
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}
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pub fn set(&mut self, entry: E) {
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#[cfg(feature = "assertions")]
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let mut finished = false; // what
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for k in 0..self.map.len() {
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let neighbour = &mut self.map[k];
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if neighbour.entry.matches(&index) {
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neighbour.entry = E::new_vacant();
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self.map_count -= 1;
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#[cfg(feature = "assertions")]
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{
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assert!(!finished);
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finished = true;
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}
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}
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if neighbour.home == home && !neighbour.entry.is_vacant() {
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largest = largest.max(if k < home {
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k + self.map.len() - home - 1 // ?
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} else {
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k - home
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})
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}
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assert!(!entry.is_vacant());
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if !self.map_bounds.contains(&(self.map_count + 1)) {
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// make sure the table is appropriately sized
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self.ensure();
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}
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self.map[home].displacement = if largest > Displacement::MAX as usize {
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Displacement::MAX
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let range = self.map.len();
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let home = entry.hashed() as usize % range;
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if self.map[home].entry.is_vacant() {
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// attempt to place it directly in an empty space
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// INSERT
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self.map[home].home = home;
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self.map[home].entry = entry;
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self.map[home].displacement = self.map[home].displacement.max(0);
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self.map_count += 1;
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} else if self.map[home].entry.matches(&entry) {
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// attempt to replace it directly
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// REPLACE
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self.map[home].entry = entry; // home.item.soft_drop()
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} else {
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largest as Displacement
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// attempt to replace it in a collided neighbour location
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for i in 1..self.map[home].displacement + 1 {
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let neighbour = &mut self.map[(home + i as usize) % range]; // todo: is mod expensive?
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if neighbour.entry.matches(&entry) {
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// found where it was displaced to
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// REPLACE
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neighbour.entry = entry;
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return;
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}
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}
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// at this point it must be added, probe to place in an empty space
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for j in self.map[home].displacement + 1..Displacement::MAX - 1 {
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let neighbour = &mut self.map[(home + j as usize) % range];
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if neighbour.entry.is_vacant() {
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// new empty slot hooray!
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// INSERT
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neighbour.entry = entry;
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neighbour.home = home;
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self.map[home].displacement = j;
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self.map_count += 1;
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return;
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}
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}
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// impossible but this still needs to be complete
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#[cfg(feature = "messages")]
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eprintln!("Large table collision, are the hashes ok?\n\tBrute-force probing...");
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let mut free: Option<usize> = None;
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for k in 0..self.map.len() {
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let neighbour = &mut self.map[k];
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if neighbour.entry.is_vacant() && free.is_none() {
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free = Some(k);
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} else if neighbour.entry.matches(&entry) {
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// REPLACE
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neighbour.entry = entry;
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return;
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}
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}
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if let Some(k) = free {
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// INSERT
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self.map[k].home = home;
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self.map[k].entry = entry;
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self.map[home].displacement = Displacement::MAX;
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self.map_count += 1;
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return;
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}
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// must resize
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#[cfg(feature = "messages")]
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eprintln!("\n\tResizing...");
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self.resize((self.map.len() + 4) * 2);
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self.set(entry);
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}
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}
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}
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}
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pub fn get_table<K>(&mut self, index: K) -> Option<&E>
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where
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E: Equivalent<K>,
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K: Hashes,
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{
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if self.map.len() == 0 {
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return None;
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}
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let location = index.hashed() as usize % self.map.len();
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let home = &self.map[location];
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if home.entry.matches(&index) {
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Some(&home.entry)
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} else {
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for i in 1..home.displacement as usize {
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let neighbour = &self.map[(location + i) % self.map.len()];
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if neighbour.entry.matches(&index) {
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return Some(&neighbour.entry);
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pub fn remove<K>(&mut self, index: K)
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where
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E: Equivalent<K>,
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K: Hashes,
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{
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if self.map.len() == 0 {
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return;
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}
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let range = self.map.len();
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let home = index.hashed() as usize % range;
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if self.map[home].entry.matches(&index) {
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self.map[home].entry = E::VACANT;
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self.map_count -= 1;
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} else {
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if self.map[home].displacement != Displacement::MAX {
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let mut largest = 0;
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for i in 1..self.map[home].displacement {
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let neighbour = &mut self.map[(home + i as usize) % range]; // todo: maybe mod slows this down
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if neighbour.entry.matches(&index) {
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neighbour.entry = E::VACANT;
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self.map_count -= 1;
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if i == self.map[home].displacement {
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self.map[home].displacement = largest
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}
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return;
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} else if !neighbour.entry.is_vacant() && neighbour.home == home {
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largest = i;
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}
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}
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} else {
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let mut largest = 0;
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#[cfg(feature = "assertions")]
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let mut finished = false; // what
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for k in 0..self.map.len() {
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let neighbour = &mut self.map[k];
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if neighbour.entry.matches(&index) {
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neighbour.entry = E::VACANT;
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self.map_count -= 1;
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#[cfg(feature = "assertions")]
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{
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assert!(!finished);
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finished = true;
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}
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}
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if neighbour.home == home && !neighbour.entry.is_vacant() {
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largest = largest.max(if k < home {
|
||||
k + self.map.len() - home - 1 // ?
|
||||
} else {
|
||||
k - home
|
||||
})
|
||||
}
|
||||
}
|
||||
self.map[home].displacement = if largest > Displacement::MAX as usize {
|
||||
Displacement::MAX
|
||||
} else {
|
||||
largest as Displacement
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
pub fn new() -> Map<E> {
|
||||
Map {
|
||||
map: Vec::new(),
|
||||
map_count: 0,
|
||||
map_bounds: (0..0).into(),
|
||||
pub fn get<K>(&mut self, index: K) -> Option<&E>
|
||||
where
|
||||
E: Equivalent<K>,
|
||||
K: Hashes,
|
||||
{
|
||||
if self.map.len() == 0 {
|
||||
return None;
|
||||
}
|
||||
let location = index.hashed() as usize % self.map.len();
|
||||
let home = &self.map[location];
|
||||
if home.entry.matches(&index) {
|
||||
Some(&home.entry)
|
||||
} else {
|
||||
for i in 1..home.displacement as usize {
|
||||
let neighbour = &self.map[(location + i) % self.map.len()];
|
||||
if neighbour.entry.matches(&index) {
|
||||
return Some(&neighbour.entry);
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
pub fn new() -> DisplacementSet<E> {
|
||||
DisplacementSet {
|
||||
map: Vec::new(),
|
||||
map_count: 0,
|
||||
map_bounds: (0..0).into(),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub struct TableEntry
|
||||
#[derive(Clone)]
|
||||
pub struct MapEntry<K: Hashes + PartialEq, V>(pub Option<(K, V)>);
|
||||
|
||||
pub type Table<K,T> = Map<>
|
||||
impl<K: PartialEq + Hashes, V> Equivalent<K> for MapEntry<K, V> {
|
||||
fn matches(&self, other: &K) -> bool {
|
||||
&self.0.as_ref().unwrap().0 == other
|
||||
}
|
||||
}
|
||||
|
||||
impl<K: Hashes + PartialEq, V> Hashes for MapEntry<K, V> {
|
||||
fn hashed(&self) -> Hashed {
|
||||
self.0.as_ref().unwrap().0.hashed()
|
||||
}
|
||||
}
|
||||
|
||||
impl<K: Hashes + PartialEq, V> PartialEq for MapEntry<K, V> {
|
||||
fn eq(&self, other: &Self) -> bool {
|
||||
self.0.as_ref().unwrap().0 == other.0.as_ref().unwrap().0
|
||||
}
|
||||
}
|
||||
|
||||
impl<K: Hashes + PartialEq, V> TableEntry for MapEntry<K, V> {
|
||||
const VACANT: Self = MapEntry(None);
|
||||
fn is_vacant(&self) -> bool {
|
||||
self.0.is_none()
|
||||
}
|
||||
}
|
||||
|
||||
pub struct Map<K: Hashes + PartialEq, V>(pub DisplacementSet<MapEntry<K, V>>);
|
||||
|
||||
impl<K: Hashes + PartialEq, V> Map<K, V> {
|
||||
pub fn resize(&mut self, len: usize) {
|
||||
self.0.resize(len)
|
||||
}
|
||||
pub fn set(&mut self, index: K, value: V) {
|
||||
self.0.set(MapEntry(Some((index, value))));
|
||||
}
|
||||
pub fn remove(&mut self, index: K) {
|
||||
self.0.remove(index);
|
||||
}
|
||||
pub fn get(&mut self, index: K) -> Option<&V> {
|
||||
if let Some(ref entry) = self.0.get(index) {
|
||||
Some(&entry.0.as_ref().unwrap().1)
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
pub fn new() -> Map<K, V> {
|
||||
Map(DisplacementSet::new())
|
||||
}
|
||||
}
|
||||
|
||||
impl<K: Debug + Hashes + PartialEq, V: Debug> Debug for Map<K, V> {
|
||||
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
||||
f.write_fmt(format_args!("Map")) // todo: debug and print the entire thing?
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(PartialEq)]
|
||||
pub struct SetEntry<E: Hashes + PartialEq>(Option<E>);
|
||||
|
||||
pub struct Set<E: Hashes + PartialEq>(DisplacementSet<SetEntry<E>>);
|
||||
|
||||
impl<E: Hashes + PartialEq> Hashes for SetEntry<E> {
|
||||
fn hashed(&self) -> Hashed {
|
||||
todo!()
|
||||
}
|
||||
}
|
||||
|
||||
impl<E: Hashes + PartialEq> TableEntry for SetEntry<E> {
|
||||
const VACANT: Self = SetEntry(None);
|
||||
fn is_vacant(&self) -> bool {
|
||||
self.0.is_none()
|
||||
}
|
||||
}
|
||||
|
||||
impl<E: Hashes + PartialEq> Equivalent<E> for SetEntry<E> {
|
||||
fn matches(&self, other: &E) -> bool {
|
||||
self.0.as_ref().unwrap() == other
|
||||
}
|
||||
}
|
||||
|
||||
impl<K, E: Hashes + PartialEq + Equivalent<K>> Equivalent<K> for SetEntry<E> {
|
||||
fn matches(&self, other: &K) -> bool {
|
||||
self.0.unwrap().matches(other)
|
||||
}
|
||||
}
|
||||
|
||||
impl<E: Hashes + PartialEq> Set<E> {
|
||||
pub fn resize(&mut self, len: usize) {
|
||||
self.0.resize(len)
|
||||
}
|
||||
pub fn set(&mut self, element: E) {
|
||||
self.0.set(SetEntry(Some(element)));
|
||||
}
|
||||
pub fn remove(&mut self, element: E) {
|
||||
self.0.remove(element);
|
||||
}
|
||||
pub fn get<K>(&mut self, element: K) -> Option<&E>
|
||||
where
|
||||
E: Equivalent<K>,
|
||||
K: Hashes,
|
||||
{
|
||||
if let Some(ref entry) = self.0.get(element) {
|
||||
Some(&entry.0.as_ref().unwrap())
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
pub fn new() -> Set<E> {
|
||||
Set(DisplacementSet::new())
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue