yet another db api

crates/libanalysis/src/db/mod.rs

@@ -1,195 +1,99 @@
-mod queries;
+mod imp;
 
 use std::{
-    hash::{Hash},
     sync::Arc,
-    fmt::Debug,
-    any::Any,
-    iter,
 };
 use im;
 use salsa;
-use {
-    FileId,
-    imp::{FileResolverImp},
-};
+use {FileId, imp::FileResolverImp};
 
-
-#[derive(Clone, Default)]
+#[derive(Debug, Default, Clone)]
 pub(crate) struct State {
-    pub(crate) resolver: FileResolverImp,
-    pub(crate) file_map: im::HashMap<FileId, Arc<str>>,
-}
-
-type Data = Arc<Any + Send + Sync + 'static>;
-
-pub(crate) struct QueryCtx<'a> {
-    inner: &'a salsa::QueryCtx<State, Data>
+    pub(crate) file_map: im::HashMap<FileId, Arc<String>>,
+    pub(crate) file_resolver: FileResolverImp
 }
 
+#[derive(Debug)]
 pub(crate) struct Db {
-    inner: salsa::Db<State, Data>
+    imp: imp::Db,
 }
 
-struct GroundQuery<T, R> {
-    id: u16,
-    f: fn(&State, &T) -> R,
-    h: fn(&R) -> u64,
+#[derive(Clone, Copy)]
+pub(crate) struct QueryCtx<'a> {
+    imp: &'a salsa::QueryCtx<State, imp::Data>,
 }
 
-pub(crate) struct Query<T, R> {
-    pub(crate) id: u16,
-    pub(crate) f: fn(QueryCtx, &T) -> R,
+pub(crate) struct Query<T, R>(pub(crate) u16, pub(crate) fn(QueryCtx, &T) -> R);
+
+pub(crate) struct QueryRegistry {
+    imp: imp::QueryRegistry,
 }
 
 impl Db {
     pub(crate) fn new() -> Db {
-        let state = Default::default();
-        Db { inner: salsa::Db::new(query_config(), state) }
+        let reg = QueryRegistry::new();
+        Db { imp: imp::Db::new(reg.imp) }
     }
     pub(crate) fn state(&self) -> &State {
-        self.inner.ground_data()
+        self.imp.imp.ground_data()
     }
-    pub(crate) fn with_state(
-        &self,
-        new_state: State,
-        updated_files: &[FileId],
-        file_set_changed: bool,
-    ) -> Db {
-        let mut inv = salsa::Invalidations::new();
-        if file_set_changed {
-            inv.invalidate(
-                salsa::QueryTypeId(queries::FILE_SET.id),
-                iter::once(salsa::InputFingerprint(hash(&()))),
-            );
-        } else {
-            inv.invalidate(
-                salsa::QueryTypeId(queries::FILE_SET.id),
-                iter::empty(),
-            );
-        }
-        inv.invalidate(
-            salsa::QueryTypeId(queries::FILE_TEXT.id),
-            updated_files.iter().map(hash).map(salsa::InputFingerprint),
-        );
-        Db { inner: self.inner.with_ground_data(new_state, inv) }
+    pub(crate) fn with_changes(&self, new_state: State, changed_files: &[FileId], resolver_changed: bool) -> Db {
+        Db { imp: self.imp.with_changes(new_state, changed_files, resolver_changed) }
     }
-    pub(crate) fn get<T, R>(&self, q: Query<T, R>, params: T) -> (Arc<R>, Vec<u16>)
-    where
-        T: Hash + Send + Sync + 'static,
-        R: Send + Sync + 'static,
-    {
-        let query_id = salsa::QueryId(
-            salsa::QueryTypeId(q.id),
-            salsa::InputFingerprint(hash(&params)),
-        );
-        let params = Arc::new(params);
-        let (res, events) = self.inner.get(query_id, params);
-        let res = res.downcast().unwrap();
-        let events = events.into_iter().map(|it| it.0).collect();
-        (res, events)
+    pub(crate) fn make_query<F: FnOnce(QueryCtx) -> R, R>(&self, f: F) -> R {
+        let ctx = QueryCtx { imp: &self.imp.imp.query_ctx() };
+        f(ctx)
+    }
+    pub(crate) fn trace_query<F: FnOnce(QueryCtx) -> R, R>(&self, f: F) -> (R, Vec<&'static str>) {
+        let ctx = QueryCtx { imp: &self.imp.imp.query_ctx() };
+        let res = f(ctx);
+        let trace = self.imp.extract_trace(ctx.imp);
+        (res, trace)
     }
-
 }
 
 impl<'a> QueryCtx<'a> {
-    fn get_g<T, R>(&self, q: GroundQuery<T, R>, params: T) -> Arc<R>
-    where
-        T: Hash + Send + Sync + 'static,
-        R: Send + Sync + 'static,
-     {
-        let query_id = salsa::QueryId(
-            salsa::QueryTypeId(q.id),
-            salsa::InputFingerprint(hash(&params)),
-        );
-        let res = self.inner.get(query_id, Arc::new(params));
-        res.downcast().unwrap()
-    }
-    pub(crate) fn get<T, R>(&self, q: Query<T, R>, params: T) -> Arc<R>
-    where
-        T: Hash + Send + Sync + 'static,
-        R: Send + Sync + 'static,
-     {
-        let query_id = salsa::QueryId(
-            salsa::QueryTypeId(q.id),
-            salsa::InputFingerprint(hash(&params)),
-        );
-        let res = self.inner.get(query_id, Arc::new(params));
-        res.downcast().unwrap()
+    pub(crate) fn get<Q: imp::EvalQuery>(&self, q: Q, params: Q::Params) -> Arc<Q::Output> {
+        q.get(self, params)
     }
 }
 
-fn query_config() -> salsa::QueryConfig<State, Data> {
-    let mut res = salsa::QueryConfig::new();
-    let queries: Vec<BoxedGroundQuery> = vec![
-        queries::FILE_TEXT.into(),
-        queries::FILE_SET.into(),
-    ];
-    for q in queries {
-        res = res.with_ground_query(q.query_type, q.f)
-    }
-    let mut queries: Vec<BoxedQuery> = vec![
-        queries::FILE_SYNTAX.into(),
-    ];
-    ::module_map_db::queries(&mut queries);
-    for q in queries {
-        res = res.with_query(q.query_type, q.f);
-    }
-    res
+pub(crate) fn file_text(ctx: QueryCtx, file_id: FileId) -> Arc<String> {
+    imp::file_text(ctx, file_id)
 }
 
-struct BoxedGroundQuery {
-    query_type: salsa::QueryTypeId,
-    f: Box<Fn(&State, &Data) -> (Data, salsa::OutputFingerprint) + Send + Sync + 'static>,
+pub(crate) fn file_set(ctx: QueryCtx) -> Arc<(Vec<FileId>, FileResolverImp)> {
+    imp::file_set(ctx)
+}
+pub(crate) use self::queries::file_syntax;
+
+mod queries {
+    use libsyntax2::File;
+    use {FileId};
+    use super::{Query, QueryCtx, QueryRegistry, file_text};
+
+    pub(crate) fn register_queries(reg: &mut QueryRegistry) {
+        reg.add(FILE_SYNTAX, "FILE_SYNTAX")
+    }
+
+    pub(crate) fn file_syntax(ctx: QueryCtx, file_id: FileId) -> File {
+        (&*ctx.get(FILE_SYNTAX, file_id)).clone()
+    }
+
+    pub(super) const FILE_SYNTAX: Query<FileId, File> = Query(16, |ctx, file_id: &FileId| {
+        let text = file_text(ctx, *file_id);
+        File::parse(&*text)
+    });
 }
 
-impl<T, R> From<GroundQuery<T, R>> for BoxedGroundQuery
-where
-    T: Send + Sync + 'static,
-    R: Send + Sync + 'static,
-{
-    fn from(q: GroundQuery<T, R>) -> BoxedGroundQuery
-    {
-        BoxedGroundQuery {
-            query_type: salsa::QueryTypeId(q.id),
-            f: Box::new(move |state, data| {
-                let data: &T = data.downcast_ref().unwrap();
-                let res = (q.f)(state, data);
-                let h = (q.h)(&res);
-                (Arc::new(res), salsa::OutputFingerprint(h))
-            })
-        }
+impl QueryRegistry {
+    fn new() -> QueryRegistry {
+        let mut reg = QueryRegistry { imp: imp::QueryRegistry::new() };
+        queries::register_queries(&mut reg);
+        ::module_map_db::register_queries(&mut reg);
+        reg
+    }
+    pub(crate) fn add<Q: imp::EvalQuery>(&mut self, q: Q, name: &'static str) {
+        self.imp.add(q, name)
     }
 }
-
-pub(crate) struct BoxedQuery {
-    query_type: salsa::QueryTypeId,
-    f: Box<Fn(&salsa::QueryCtx<State, Data>, &Data) -> (Data, salsa::OutputFingerprint) + Send + Sync + 'static>,
-}
-
-impl<T, R> From<Query<T, R>> for BoxedQuery
-where
-    T: Hash + Send + Sync + 'static,
-    R: Hash + Send + Sync + 'static,
-{
-    fn from(q: Query<T, R>) -> BoxedQuery
-    {
-        BoxedQuery {
-            query_type: salsa::QueryTypeId(q.id),
-            f: Box::new(move |ctx, data| {
-                let ctx = QueryCtx { inner: ctx };
-                let data: &T = data.downcast_ref().unwrap();
-                let res = (q.f)(ctx, data);
-                let h = hash(&res);
-                (Arc::new(res), salsa::OutputFingerprint(h))
-            })
-        }
-    }
-}
-
-fn hash<T: ::std::hash::Hash>(x: &T) -> u64 {
-    use std::hash::Hasher;
-    let mut hasher = ::std::collections::hash_map::DefaultHasher::new();
-    ::std::hash::Hash::hash(x, &mut hasher);
-    hasher.finish()
-}