93 lines
2.9 KiB
Rust
93 lines
2.9 KiB
Rust
//! System caches.
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use crate::func::{CallableFunction, StraightHashMap};
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use crate::types::BloomFilterU64;
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use crate::{Identifier, StaticVec};
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use std::marker::PhantomData;
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#[cfg(feature = "no_std")]
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use std::prelude::v1::*;
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/// _(internals)_ An entry in a function resolution cache.
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/// Exported under the `internals` feature only.
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#[derive(Debug, Clone)]
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pub struct FnResolutionCacheEntry {
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/// Function.
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pub func: CallableFunction,
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/// Optional source.
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pub source: Option<Box<Identifier>>,
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}
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/// _(internals)_ A function resolution cache with a bloom filter.
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/// Exported under the `internals` feature only.
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///
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/// The bloom filter is used to rapidly check whether a function hash has never been encountered.
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/// It enables caching a hash only during the second encounter to avoid "one-hit wonders".
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#[derive(Debug, Clone, Default)]
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pub struct FnResolutionCache {
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/// Hash map containing cached functions.
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pub map: StraightHashMap<Option<FnResolutionCacheEntry>>,
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/// Bloom filter to avoid caching "one-hit wonders".
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pub filter: BloomFilterU64,
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}
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impl FnResolutionCache {
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/// Clear the [`FnResolutionCache`].
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#[inline(always)]
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pub fn clear(&mut self) {
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self.map.clear();
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self.filter.clear();
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}
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}
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/// _(internals)_ A type containing system-wide caches.
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/// Exported under the `internals` feature only.
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///
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/// The following caches are contained inside this type:
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/// * A stack of [function resolution caches][FnResolutionCache]
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#[derive(Debug, Clone)]
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pub struct Caches<'a> {
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/// Stack of [function resolution caches][FnResolutionCache].
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stack: StaticVec<FnResolutionCache>,
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/// Take care of the lifetime parameter.
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dummy: PhantomData<&'a ()>,
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}
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impl Caches<'_> {
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/// Create an empty [`Caches`].
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#[inline(always)]
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#[must_use]
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pub const fn new() -> Self {
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Self {
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stack: StaticVec::new_const(),
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dummy: PhantomData,
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}
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}
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/// Get the number of function resolution cache(s) in the stack.
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#[inline(always)]
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#[must_use]
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pub fn fn_resolution_caches_len(&self) -> usize {
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self.stack.len()
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}
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/// Get a mutable reference to the current function resolution cache.
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#[inline]
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#[must_use]
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pub fn fn_resolution_cache_mut(&mut self) -> &mut FnResolutionCache {
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if self.stack.is_empty() {
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// Push a new function resolution cache if the stack is empty
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self.push_fn_resolution_cache();
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}
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self.stack.last_mut().unwrap()
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}
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/// Push an empty function resolution cache onto the stack and make it current.
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#[allow(dead_code)]
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#[inline(always)]
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pub fn push_fn_resolution_cache(&mut self) {
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self.stack.push(Default::default());
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}
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/// Rewind the function resolution caches stack to a particular size.
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#[inline(always)]
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pub fn rewind_fn_resolution_caches(&mut self, len: usize) {
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self.stack.truncate(len);
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}
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}
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