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use std::{
sync::Arc,
any::Any,
hash::{Hash, Hasher},
collections::hash_map::{DefaultHasher, HashMap},
iter,
};
use salsa;
use {FileId, imp::FileResolverImp};
use super::{State, Query, QueryCtx};
pub(super) type Data = Arc<Any + Send + Sync + 'static>;
#[derive(Debug)]
pub(super) struct Db {
names: Arc<HashMap<salsa::QueryTypeId, &'static str>>,
pub(super) imp: salsa::Db<State, Data>,
}
impl Db {
pub(super) fn new(mut reg: QueryRegistry) -> Db {
let config = reg.config.take().unwrap();
Db {
names: Arc::new(reg.names),
imp: salsa::Db::new(config, State::default())
}
}
pub(crate) fn with_changes(&self, new_state: State, changed_files: &[FileId], resolver_changed: bool) -> Db {
let names = self.names.clone();
let mut invalidations = salsa::Invalidations::new();
invalidations.invalidate(FILE_TEXT, changed_files.iter().map(hash).map(salsa::InputFingerprint));
if resolver_changed {
invalidations.invalidate(FILE_SET, iter::once(salsa::InputFingerprint(hash(&()))));
} else {
invalidations.invalidate(FILE_SET, iter::empty());
}
let imp = self.imp.with_ground_data(
new_state,
invalidations,
);
Db { names, imp }
}
pub(super) fn extract_trace(&self, ctx: &salsa::QueryCtx<State, Data>) -> Vec<&'static str> {
ctx.trace().into_iter().map(|it| self.names[&it]).collect()
}
}
pub(crate) trait EvalQuery {
type Params;
type Output;
fn query_type(&self) -> salsa::QueryTypeId;
fn f(&self) -> salsa::QueryFn<State, Data>;
fn get(&self, &QueryCtx, Self::Params) -> Arc<Self::Output>;
}
impl<T, R> EvalQuery for Query<T, R>
where
T: Hash + Send + Sync + 'static,
R: Hash + Send + Sync + 'static,
{
type Params = T;
type Output = R;
fn query_type(&self) -> salsa::QueryTypeId {
salsa::QueryTypeId(self.0)
}
fn f(&self) -> salsa::QueryFn<State, Data> {
let f = self.1;
Box::new(move |ctx, data| {
let ctx = QueryCtx { imp: ctx };
let data: &T = data.downcast_ref().unwrap();
let res = f(ctx, data);
let h = hash(&res);
(Arc::new(res), salsa::OutputFingerprint(h))
})
}
fn get(&self, ctx: &QueryCtx, params: Self::Params) -> Arc<Self::Output> {
let query_id = salsa::QueryId(
self.query_type(),
salsa::InputFingerprint(hash(¶ms)),
);
let res = ctx.imp.get(query_id, Arc::new(params));
res.downcast().unwrap()
}
}
pub(super) struct QueryRegistry {
config: Option<salsa::QueryConfig<State, Data>>,
names: HashMap<salsa::QueryTypeId, &'static str>,
}
impl QueryRegistry {
pub(super) fn new() -> QueryRegistry {
let mut config = salsa::QueryConfig::<State, Data>::new();
config = config.with_ground_query(
FILE_TEXT, Box::new(|state, params| {
let file_id: &FileId = params.downcast_ref().unwrap();
let res = state.file_map[file_id].clone();
let fingerprint = salsa::OutputFingerprint(hash(&res));
(res, fingerprint)
})
);
config = config.with_ground_query(
FILE_SET, Box::new(|state, _params| {
let file_ids: Vec<FileId> = state.file_map.keys().cloned().collect();
let hash = hash(&file_ids);
let file_resolver = state.file_resolver.clone();
let res = (file_ids, file_resolver);
let fingerprint = salsa::OutputFingerprint(hash);
(Arc::new(res), fingerprint)
})
);
let mut names = HashMap::new();
names.insert(FILE_TEXT, "FILE_TEXT");
names.insert(FILE_SET, "FILE_SET");
QueryRegistry { config: Some(config), names }
}
pub(super) fn add<Q: EvalQuery>(&mut self, q: Q, name: &'static str) {
let id = q.query_type();
let prev = self.names.insert(id, name);
assert!(prev.is_none(), "duplicate query: {:?}", id);
let config = self.config.take().unwrap();
let config = config.with_query(id, q.f());
self.config= Some(config);
}
}
fn hash<T: Hash>(x: &T) -> u64 {
let mut hasher = DefaultHasher::new();
x.hash(&mut hasher);
hasher.finish()
}
const FILE_TEXT: salsa::QueryTypeId = salsa::QueryTypeId(0);
pub(super) fn file_text(ctx: QueryCtx, file_id: FileId) -> Arc<String> {
let query_id = salsa::QueryId(
FILE_TEXT,
salsa::InputFingerprint(hash(&file_id)),
);
let res = ctx.imp.get(query_id, Arc::new(file_id));
res.downcast().unwrap()
}
const FILE_SET: salsa::QueryTypeId = salsa::QueryTypeId(1);
pub(super) fn file_set(ctx: QueryCtx) -> Arc<(Vec<FileId>, FileResolverImp)> {
let query_id = salsa::QueryId(
FILE_SET,
salsa::InputFingerprint(hash(&())),
);
let res = ctx.imp.get(query_id, Arc::new(()));
res.downcast().unwrap()
}
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