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use parking_lot::Mutex;
use std::{
hash::Hash,
sync::Arc,
};
use rustc_hash::FxHashMap;
use crate::{
syntax_ptr::SyntaxPtr,
};
/// There are two principle ways to refer to things:
/// - by their locatinon (module in foo/bar/baz.rs at line 42)
/// - by their numeric id (module `ModuleId(42)`)
///
/// The first one is more powerful (you can actually find the thing in question
/// by id), but the second one is so much more compact.
///
/// `Loc2IdMap` allows us to have a cake an eat it as well: by maintaining a
/// bidirectional mapping between positional and numeric ids, we can use compact
/// representation wich still allows us to get the actual item
#[derive(Debug)]
pub(crate) struct Loc2IdMap<L, ID>
where
ID: NumericId,
L: Clone + Eq + Hash,
{
loc2id: FxHashMap<L, ID>,
id2loc: FxHashMap<ID, L>,
}
impl<L, ID> Default for Loc2IdMap<L, ID>
where
ID: NumericId,
L: Clone + Eq + Hash,
{
fn default() -> Self {
Loc2IdMap {
loc2id: FxHashMap::default(),
id2loc: FxHashMap::default(),
}
}
}
impl<L, ID> Loc2IdMap<L, ID>
where
ID: NumericId,
L: Clone + Eq + Hash,
{
pub fn loc2id(&mut self, loc: &L) -> ID {
match self.loc2id.get(loc) {
Some(id) => return id.clone(),
None => (),
}
let id = self.loc2id.len();
assert!(id < u32::max_value() as usize);
let id = ID::from_u32(id as u32);
self.loc2id.insert(loc.clone(), id.clone());
self.id2loc.insert(id.clone(), loc.clone());
id
}
pub fn id2loc(&self, id: ID) -> L {
self.id2loc[&id].clone()
}
}
pub(crate) trait NumericId: Clone + Eq + Hash {
fn from_u32(id: u32) -> Self;
fn to_u32(self) -> u32;
}
macro_rules! impl_numeric_id {
($id:ident) => {
impl NumericId for $id {
fn from_u32(id: u32) -> Self {
$id(id)
}
fn to_u32(self) -> u32 {
self.0
}
}
};
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct FnId(u32);
impl_numeric_id!(FnId);
pub(crate) trait IdDatabase: salsa::Database {
fn id_maps(&self) -> &IdMaps;
}
#[derive(Debug, Default, Clone)]
pub(crate) struct IdMaps {
inner: Arc<IdMapsInner>,
}
impl IdMaps {
pub(crate) fn fn_id(&self, ptr: SyntaxPtr) -> FnId {
self.inner.fns.lock().loc2id(&ptr)
}
pub(crate) fn fn_ptr(&self, fn_id: FnId) -> SyntaxPtr {
self.inner.fns.lock().id2loc(fn_id)
}
}
#[derive(Debug, Default)]
struct IdMapsInner {
fns: Mutex<Loc2IdMap<SyntaxPtr, FnId>>,
}
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