1 files changed, 138 insertions, 0 deletions

diff --git a/crates/ra_ide_db/src/lib.rs b/crates/ra_ide_db/src/lib.rs
new file mode 100644
index 000000000..e922d1e5f
--- /dev/null
+++ b/crates/ra_ide_db/src/lib.rs
@@ -0,0 +1,138 @@
+//! This crate defines the core datastructure representing IDE state -- `RootDatabase`.
+//!
+//! It is mainly a `HirDatabase` for semantic analysis, plus a `SymbolsDatabase`, for fuzzy search.
+
+pub mod line_index;
+pub mod line_index_utils;
+pub mod feature_flags;
+pub mod symbol_index;
+pub mod change;
+mod wasm_shims;
+
+use std::sync::Arc;
+
+use ra_db::{
+    salsa::{self, Database, Durability},
+    Canceled, CheckCanceled, CrateId, FileId, FileLoader, FileLoaderDelegate, RelativePath,
+    SourceDatabase, SourceRootId,
+};
+use rustc_hash::FxHashMap;
+
+use crate::{feature_flags::FeatureFlags, line_index::LineIndex, symbol_index::SymbolsDatabase};
+
+#[salsa::database(
+    ra_db::SourceDatabaseStorage,
+    ra_db::SourceDatabaseExtStorage,
+    LineIndexDatabaseStorage,
+    symbol_index::SymbolsDatabaseStorage,
+    hir::db::InternDatabaseStorage,
+    hir::db::AstDatabaseStorage,
+    hir::db::DefDatabaseStorage,
+    hir::db::HirDatabaseStorage
+)]
+#[derive(Debug)]
+pub struct RootDatabase {
+    runtime: salsa::Runtime<RootDatabase>,
+    pub feature_flags: Arc<FeatureFlags>,
+    pub(crate) debug_data: Arc<DebugData>,
+    pub last_gc: crate::wasm_shims::Instant,
+    pub last_gc_check: crate::wasm_shims::Instant,
+}
+
+impl FileLoader for RootDatabase {
+    fn file_text(&self, file_id: FileId) -> Arc<String> {
+        FileLoaderDelegate(self).file_text(file_id)
+    }
+    fn resolve_relative_path(
+        &self,
+        anchor: FileId,
+        relative_path: &RelativePath,
+    ) -> Option<FileId> {
+        FileLoaderDelegate(self).resolve_relative_path(anchor, relative_path)
+    }
+    fn relevant_crates(&self, file_id: FileId) -> Arc<Vec<CrateId>> {
+        FileLoaderDelegate(self).relevant_crates(file_id)
+    }
+}
+
+impl salsa::Database for RootDatabase {
+    fn salsa_runtime(&self) -> &salsa::Runtime<RootDatabase> {
+        &self.runtime
+    }
+    fn salsa_runtime_mut(&mut self) -> &mut salsa::Runtime<Self> {
+        &mut self.runtime
+    }
+    fn on_propagated_panic(&self) -> ! {
+        Canceled::throw()
+    }
+    fn salsa_event(&self, event: impl Fn() -> salsa::Event<RootDatabase>) {
+        match event().kind {
+            salsa::EventKind::DidValidateMemoizedValue { .. }
+            | salsa::EventKind::WillExecute { .. } => {
+                self.check_canceled();
+            }
+            _ => (),
+        }
+    }
+}
+
+impl Default for RootDatabase {
+    fn default() -> RootDatabase {
+        RootDatabase::new(None, FeatureFlags::default())
+    }
+}
+
+impl RootDatabase {
+    pub fn new(lru_capacity: Option<usize>, feature_flags: FeatureFlags) -> RootDatabase {
+        let mut db = RootDatabase {
+            runtime: salsa::Runtime::default(),
+            last_gc: crate::wasm_shims::Instant::now(),
+            last_gc_check: crate::wasm_shims::Instant::now(),
+            feature_flags: Arc::new(feature_flags),
+            debug_data: Default::default(),
+        };
+        db.set_crate_graph_with_durability(Default::default(), Durability::HIGH);
+        db.set_local_roots_with_durability(Default::default(), Durability::HIGH);
+        db.set_library_roots_with_durability(Default::default(), Durability::HIGH);
+        let lru_capacity = lru_capacity.unwrap_or(ra_db::DEFAULT_LRU_CAP);
+        db.query_mut(ra_db::ParseQuery).set_lru_capacity(lru_capacity);
+        db.query_mut(hir::db::ParseMacroQuery).set_lru_capacity(lru_capacity);
+        db.query_mut(hir::db::MacroExpandQuery).set_lru_capacity(lru_capacity);
+        db
+    }
+}
+
+impl salsa::ParallelDatabase for RootDatabase {
+    fn snapshot(&self) -> salsa::Snapshot<RootDatabase> {
+        salsa::Snapshot::new(RootDatabase {
+            runtime: self.runtime.snapshot(self),
+            last_gc: self.last_gc,
+            last_gc_check: self.last_gc_check,
+            feature_flags: Arc::clone(&self.feature_flags),
+            debug_data: Arc::clone(&self.debug_data),
+        })
+    }
+}
+
+#[salsa::query_group(LineIndexDatabaseStorage)]
+pub trait LineIndexDatabase: ra_db::SourceDatabase + CheckCanceled {
+    fn line_index(&self, file_id: FileId) -> Arc<LineIndex>;
+}
+
+fn line_index(db: &impl LineIndexDatabase, file_id: FileId) -> Arc<LineIndex> {
+    let text = db.file_text(file_id);
+    Arc::new(LineIndex::new(&*text))
+}
+
+#[derive(Debug, Default, Clone)]
+pub(crate) struct DebugData {
+    pub(crate) root_paths: FxHashMap<SourceRootId, String>,
+    pub(crate) crate_names: FxHashMap<CrateId, String>,
+}
+
+impl DebugData {
+    pub(crate) fn merge(&mut self, other: DebugData) {
+        self.root_paths.extend(other.root_paths.into_iter());
+        self.crate_names.extend(other.crate_names.into_iter());
+    }
+}