13 files changed, 57 insertions, 53 deletions

diff --git a/crates/ra_ide_api/src/call_info.rs b/crates/ra_ide_api/src/call_info.rs
index 0449c1902..3267fff96 100644
--- a/crates/ra_ide_api/src/call_info.rs
+++ b/crates/ra_ide_api/src/call_info.rs
@@ -1,4 +1,4 @@
-use ra_db::SyntaxDatabase;
+use ra_db::SourceDatabase;
 use ra_syntax::{
     AstNode, SyntaxNode, TextUnit, TextRange,
     SyntaxKind::FN_DEF,
@@ -10,7 +10,7 @@ use crate::{FilePosition, CallInfo, db::RootDatabase};
 
 /// Computes parameter information for the given call expression.
 pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<CallInfo> {
-    let file = db.source_file(position.file_id);
+    let file = db.parse(position.file_id);
     let syntax = file.syntax();
 
     // Find the calling expression and it's NameRef
@@ -22,7 +22,7 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
     let symbol = file_symbols
         .into_iter()
         .find(|it| it.ptr.kind() == FN_DEF)?;
-    let fn_file = db.source_file(symbol.file_id);
+    let fn_file = db.parse(symbol.file_id);
     let fn_def = symbol.ptr.to_node(&fn_file);
     let fn_def = ast::FnDef::cast(fn_def).unwrap();
     let mut call_info = CallInfo::new(fn_def)?;
diff --git a/crates/ra_ide_api/src/completion.rs b/crates/ra_ide_api/src/completion.rs
index 565d57c37..b1867de42 100644
--- a/crates/ra_ide_api/src/completion.rs
+++ b/crates/ra_ide_api/src/completion.rs
@@ -9,7 +9,7 @@ mod complete_path;
 mod complete_scope;
 mod complete_postfix;
 
-use ra_db::SyntaxDatabase;
+use ra_db::SourceDatabase;
 
 use crate::{
     db,
@@ -45,7 +45,7 @@ pub use crate::completion::completion_item::{CompletionItem, CompletionItemKind,
 /// identifier prefix/fuzzy match should be done higher in the stack, together
 /// with ordering of completions (currently this is done by the client).
 pub(crate) fn completions(db: &db::RootDatabase, position: FilePosition) -> Option<Completions> {
-    let original_file = db.source_file(position.file_id);
+    let original_file = db.parse(position.file_id);
     let ctx = CompletionContext::new(db, &original_file, position)?;
 
     let mut acc = Completions::default();
diff --git a/crates/ra_ide_api/src/db.rs b/crates/ra_ide_api/src/db.rs
index 30891aed4..3da93ec35 100644
--- a/crates/ra_ide_api/src/db.rs
+++ b/crates/ra_ide_api/src/db.rs
@@ -1,15 +1,14 @@
 use std::sync::Arc;
 
 use ra_db::{
-    BaseDatabase, FileId, Canceled,
-    salsa::{self, Database},
+    CheckCanceled, FileId, Canceled, SourceDatabase,
+    salsa,
 };
 
-use crate::{symbol_index, LineIndex};
+use crate::{LineIndex, symbol_index::{self, SymbolsDatabase}};
 
 #[salsa::database(
-    ra_db::FilesDatabaseStorage,
-    ra_db::SyntaxDatabaseStorage,
+    ra_db::SourceDatabaseStorage,
     LineIndexDatabaseStorage,
     symbol_index::SymbolsDatabaseStorage,
     hir::db::HirDatabaseStorage
@@ -35,12 +34,9 @@ impl Default for RootDatabase {
             runtime: salsa::Runtime::default(),
             interner: Default::default(),
         };
-        db.query_mut(ra_db::CrateGraphQuery)
-            .set((), Default::default());
-        db.query_mut(ra_db::LocalRootsQuery)
-            .set((), Default::default());
-        db.query_mut(ra_db::LibraryRootsQuery)
-            .set((), Default::default());
+        db.set_crate_graph(Default::default());
+        db.set_local_roots(Default::default());
+        db.set_library_roots(Default::default());
         db
     }
 }
@@ -54,7 +50,7 @@ impl salsa::ParallelDatabase for RootDatabase {
     }
 }
 
-impl BaseDatabase for RootDatabase {}
+impl CheckCanceled for RootDatabase {}
 
 impl AsRef<hir::HirInterner> for RootDatabase {
     fn as_ref(&self) -> &hir::HirInterner {
@@ -63,11 +59,11 @@ impl AsRef<hir::HirInterner> for RootDatabase {
 }
 
 #[salsa::query_group(LineIndexDatabaseStorage)]
-pub(crate) trait LineIndexDatabase: ra_db::FilesDatabase + BaseDatabase {
+pub(crate) trait LineIndexDatabase: ra_db::SourceDatabase + CheckCanceled {
     fn line_index(&self, file_id: FileId) -> Arc<LineIndex>;
 }
 
-fn line_index(db: &impl ra_db::FilesDatabase, file_id: FileId) -> Arc<LineIndex> {
+fn line_index(db: &impl ra_db::SourceDatabase, file_id: FileId) -> Arc<LineIndex> {
     let text = db.file_text(file_id);
     Arc::new(LineIndex::new(&*text))
 }
diff --git a/crates/ra_ide_api/src/extend_selection.rs b/crates/ra_ide_api/src/extend_selection.rs
index 718b4def5..cd2ebe471 100644
--- a/crates/ra_ide_api/src/extend_selection.rs
+++ b/crates/ra_ide_api/src/extend_selection.rs
@@ -1,4 +1,4 @@
-use ra_db::SyntaxDatabase;
+use ra_db::SourceDatabase;
 use ra_syntax::{
     SyntaxNode, AstNode, SourceFile,
     ast, algo::find_covering_node,
@@ -10,7 +10,7 @@ use crate::{
 };
 
 pub(crate) fn extend_selection(db: &RootDatabase, frange: FileRange) -> TextRange {
-    let source_file = db.source_file(frange.file_id);
+    let source_file = db.parse(frange.file_id);
     if let Some(range) = extend_selection_in_macro(db, &source_file, frange) {
         return range;
     }
diff --git a/crates/ra_ide_api/src/goto_definition.rs b/crates/ra_ide_api/src/goto_definition.rs
index dc0c50918..2a20c20ee 100644
--- a/crates/ra_ide_api/src/goto_definition.rs
+++ b/crates/ra_ide_api/src/goto_definition.rs
@@ -1,4 +1,4 @@
-use ra_db::{FileId, SyntaxDatabase};
+use ra_db::{FileId, SourceDatabase};
 use ra_syntax::{
     AstNode, ast,
     algo::find_node_at_offset,
@@ -11,7 +11,7 @@ pub(crate) fn goto_definition(
     db: &RootDatabase,
     position: FilePosition,
 ) -> Option<RangeInfo<Vec<NavigationTarget>>> {
-    let file = db.source_file(position.file_id);
+    let file = db.parse(position.file_id);
     let syntax = file.syntax();
     if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(syntax, position.offset) {
         let navs = reference_definition(db, position.file_id, name_ref).to_vec();
diff --git a/crates/ra_ide_api/src/hover.rs b/crates/ra_ide_api/src/hover.rs
index 4d4bfbc4d..ff9ae2d9c 100644
--- a/crates/ra_ide_api/src/hover.rs
+++ b/crates/ra_ide_api/src/hover.rs
@@ -1,4 +1,4 @@
-use ra_db::{SyntaxDatabase};
+use ra_db::SourceDatabase;
 use ra_syntax::{
     AstNode, SyntaxNode, TreeArc, ast,
     algo::{find_covering_node, find_node_at_offset, find_leaf_at_offset, visit::{visitor, Visitor}},
@@ -7,7 +7,7 @@ use ra_syntax::{
 use crate::{db::RootDatabase, RangeInfo, FilePosition, FileRange, NavigationTarget};
 
 pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeInfo<String>> {
-    let file = db.source_file(position.file_id);
+    let file = db.parse(position.file_id);
     let mut res = Vec::new();
 
     let mut range = None;
@@ -53,7 +53,7 @@ pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeIn
 }
 
 pub(crate) fn type_of(db: &RootDatabase, frange: FileRange) -> Option<String> {
-    let file = db.source_file(frange.file_id);
+    let file = db.parse(frange.file_id);
     let syntax = file.syntax();
     let leaf_node = find_covering_node(syntax, frange.range);
     // if we picked identifier, expand to pattern/expression
@@ -88,7 +88,7 @@ fn doc_text_for(db: &RootDatabase, nav: NavigationTarget) -> Option<String> {
 
 impl NavigationTarget {
     fn node(&self, db: &RootDatabase) -> Option<TreeArc<SyntaxNode>> {
-        let source_file = db.source_file(self.file_id());
+        let source_file = db.parse(self.file_id());
         let source_file = source_file.syntax();
         let node = source_file
             .descendants()
diff --git a/crates/ra_ide_api/src/imp.rs b/crates/ra_ide_api/src/imp.rs
index bd9e3f1e3..399433a01 100644
--- a/crates/ra_ide_api/src/imp.rs
+++ b/crates/ra_ide_api/src/imp.rs
@@ -4,7 +4,7 @@ use hir::{
     self, Problem, source_binder
 };
 use ra_db::{
-    FilesDatabase, SourceRoot, SourceRootId, SyntaxDatabase,
+    SourceDatabase, SourceRoot, SourceRootId,
     salsa::{Database, SweepStrategy},
 };
 use ra_ide_api_light::{self, assists, LocalEdit, Severity};
@@ -76,9 +76,9 @@ impl db::RootDatabase {
     /// syntax trees. However, if we actually do that, everything is recomputed
     /// for some reason. Needs investigation.
     pub(crate) fn collect_garbage(&mut self) {
-        self.query(ra_db::SourceFileQuery)
+        self.query(ra_db::ParseQuery)
             .sweep(SweepStrategy::default().discard_values());
-        self.query(hir::db::HirSourceFileQuery)
+        self.query(hir::db::HirParseQuery)
             .sweep(SweepStrategy::default().discard_values());
         self.query(hir::db::FileItemsQuery)
             .sweep(SweepStrategy::default().discard_values());
@@ -102,7 +102,7 @@ impl db::RootDatabase {
     }
 
     pub(crate) fn find_all_refs(&self, position: FilePosition) -> Vec<(FileId, TextRange)> {
-        let file = self.source_file(position.file_id);
+        let file = self.parse(position.file_id);
         // Find the binding associated with the offset
         let (binding, descr) = match find_binding(self, &file, position) {
             None => return Vec::new(),
@@ -150,7 +150,7 @@ impl db::RootDatabase {
     }
 
     pub(crate) fn diagnostics(&self, file_id: FileId) -> Vec<Diagnostic> {
-        let syntax = self.source_file(file_id);
+        let syntax = self.parse(file_id);
 
         let mut res = ra_ide_api_light::diagnostics(&syntax)
             .into_iter()
@@ -214,7 +214,7 @@ impl db::RootDatabase {
     }
 
     pub(crate) fn assists(&self, frange: FileRange) -> Vec<SourceChange> {
-        let file = self.source_file(frange.file_id);
+        let file = self.parse(frange.file_id);
         assists::assists(&file, frange.range)
             .into_iter()
             .map(|local_edit| SourceChange::from_local_edit(frange.file_id, local_edit))
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index ffd026b04..43c8bea71 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -34,7 +34,7 @@ use std::{fmt, sync::Arc};
 use ra_syntax::{SourceFile, TreeArc, TextRange, TextUnit};
 use ra_text_edit::TextEdit;
 use ra_db::{
-    SyntaxDatabase, FilesDatabase, BaseDatabase,
+    SourceDatabase, CheckCanceled,
     salsa::{self, ParallelDatabase},
 };
 use rayon::prelude::*;
@@ -313,7 +313,7 @@ impl Analysis {
 
     /// Gets the syntax tree of the file.
     pub fn parse(&self, file_id: FileId) -> TreeArc<SourceFile> {
-        self.db.source_file(file_id).clone()
+        self.db.parse(file_id).clone()
     }
 
     /// Gets the file's `LineIndex`: data structure to convert between absolute
@@ -330,21 +330,21 @@ impl Analysis {
     /// Returns position of the mathcing brace (all types of braces are
     /// supported).
     pub fn matching_brace(&self, position: FilePosition) -> Option<TextUnit> {
-        let file = self.db.source_file(position.file_id);
+        let file = self.db.parse(position.file_id);
         ra_ide_api_light::matching_brace(&file, position.offset)
     }
 
     /// Returns a syntax tree represented as `String`, for debug purposes.
     // FIXME: use a better name here.
     pub fn syntax_tree(&self, file_id: FileId) -> String {
-        let file = self.db.source_file(file_id);
+        let file = self.db.parse(file_id);
         ra_ide_api_light::syntax_tree(&file)
     }
 
     /// Returns an edit to remove all newlines in the range, cleaning up minor
     /// stuff like trailing commas.
     pub fn join_lines(&self, frange: FileRange) -> SourceChange {
-        let file = self.db.source_file(frange.file_id);
+        let file = self.db.parse(frange.file_id);
         SourceChange::from_local_edit(
             frange.file_id,
             ra_ide_api_light::join_lines(&file, frange.range),
@@ -354,7 +354,7 @@ impl Analysis {
     /// Returns an edit which should be applied when opening a new line, fixing
     /// up minor stuff like continuing the comment.
     pub fn on_enter(&self, position: FilePosition) -> Option<SourceChange> {
-        let file = self.db.source_file(position.file_id);
+        let file = self.db.parse(position.file_id);
         let edit = ra_ide_api_light::on_enter(&file, position.offset)?;
         Some(SourceChange::from_local_edit(position.file_id, edit))
     }
@@ -363,14 +363,14 @@ impl Analysis {
     /// this works when adding `let =`.
     // FIXME: use a snippet completion instead of this hack here.
     pub fn on_eq_typed(&self, position: FilePosition) -> Option<SourceChange> {
-        let file = self.db.source_file(position.file_id);
+        let file = self.db.parse(position.file_id);
         let edit = ra_ide_api_light::on_eq_typed(&file, position.offset)?;
         Some(SourceChange::from_local_edit(position.file_id, edit))
     }
 
     /// Returns an edit which should be applied when a dot ('.') is typed on a blank line, indenting the line appropriately.
     pub fn on_dot_typed(&self, position: FilePosition) -> Option<SourceChange> {
-        let file = self.db.source_file(position.file_id);
+        let file = self.db.parse(position.file_id);
         let edit = ra_ide_api_light::on_dot_typed(&file, position.offset)?;
         Some(SourceChange::from_local_edit(position.file_id, edit))
     }
@@ -378,13 +378,13 @@ impl Analysis {
     /// Returns a tree representation of symbols in the file. Useful to draw a
     /// file outline.
     pub fn file_structure(&self, file_id: FileId) -> Vec<StructureNode> {
-        let file = self.db.source_file(file_id);
+        let file = self.db.parse(file_id);
         ra_ide_api_light::file_structure(&file)
     }
 
     /// Returns the set of folding ranges.
     pub fn folding_ranges(&self, file_id: FileId) -> Vec<Fold> {
-        let file = self.db.source_file(file_id);
+        let file = self.db.parse(file_id);
         ra_ide_api_light::folding_ranges(&file)
     }
 
diff --git a/crates/ra_ide_api/src/rename.rs b/crates/ra_ide_api/src/rename.rs
index 5b767addd..db5ccf969 100644
--- a/crates/ra_ide_api/src/rename.rs
+++ b/crates/ra_ide_api/src/rename.rs
@@ -17,7 +17,7 @@ use crate::{
     SourceChange,
     SourceFileEdit,
 };
-use ra_db::{FilesDatabase, SyntaxDatabase};
+use ra_db::SourceDatabase;
 use relative_path::RelativePath;
 
 pub(crate) fn rename(
@@ -25,7 +25,7 @@ pub(crate) fn rename(
     position: FilePosition,
     new_name: &str,
 ) -> Option<SourceChange> {
-    let source_file = db.source_file(position.file_id);
+    let source_file = db.parse(position.file_id);
     let syntax = source_file.syntax();
 
     if let Some((ast_name, ast_module)) = find_name_and_module_at_offset(syntax, position) {
diff --git a/crates/ra_ide_api/src/runnables.rs b/crates/ra_ide_api/src/runnables.rs
index 0f9f8deb3..dc8c40ea6 100644
--- a/crates/ra_ide_api/src/runnables.rs
+++ b/crates/ra_ide_api/src/runnables.rs
@@ -3,7 +3,7 @@ use ra_syntax::{
     TextRange, SyntaxNode,
     ast::{self, AstNode, NameOwner, ModuleItemOwner},
 };
-use ra_db::SyntaxDatabase;
+use ra_db::SourceDatabase;
 
 use crate::{db::RootDatabase, FileId};
 
@@ -22,7 +22,7 @@ pub enum RunnableKind {
 }
 
 pub(crate) fn runnables(db: &RootDatabase, file_id: FileId) -> Vec<Runnable> {
-    let source_file = db.source_file(file_id);
+    let source_file = db.parse(file_id);
     source_file
         .syntax()
         .descendants()
diff --git a/crates/ra_ide_api/src/status.rs b/crates/ra_ide_api/src/status.rs
index 59159df98..e11eed223 100644
--- a/crates/ra_ide_api/src/status.rs
+++ b/crates/ra_ide_api/src/status.rs
@@ -6,7 +6,7 @@ use std::{
 
 use ra_syntax::{AstNode, TreeArc, SourceFile};
 use ra_db::{
-    SourceFileQuery, FileTextQuery, SourceRootId,
+    ParseQuery, FileTextQuery, SourceRootId,
     salsa::{Database, debug::{DebugQueryTable, TableEntry}},
 };
 
@@ -17,7 +17,7 @@ use crate::{
 
 pub(crate) fn status(db: &RootDatabase) -> String {
     let files_stats = db.query(FileTextQuery).entries::<FilesStats>();
-    let syntax_tree_stats = db.query(SourceFileQuery).entries::<SyntaxTreeStats>();
+    let syntax_tree_stats = db.query(ParseQuery).entries::<SyntaxTreeStats>();
     let symbols_stats = db
         .query(LibrarySymbolsQuery)
         .entries::<LibrarySymbolsStats>();
diff --git a/crates/ra_ide_api/src/symbol_index.rs b/crates/ra_ide_api/src/symbol_index.rs
index e073a349e..72c93f530 100644
--- a/crates/ra_ide_api/src/symbol_index.rs
+++ b/crates/ra_ide_api/src/symbol_index.rs
@@ -34,7 +34,7 @@ use ra_syntax::{
     ast::{self, NameOwner},
 };
 use ra_db::{
-    SourceRootId, FilesDatabase,
+    SourceRootId, SourceDatabase,
     salsa::{self, ParallelDatabase},
 };
 use rayon::prelude::*;
@@ -49,11 +49,19 @@ pub(crate) trait SymbolsDatabase: hir::db::HirDatabase {
     fn file_symbols(&self, file_id: FileId) -> Arc<SymbolIndex>;
     #[salsa::input]
     fn library_symbols(&self, id: SourceRootId) -> Arc<SymbolIndex>;
+    /// The set of "local" (that is, from the current workspace) roots.
+    /// Files in local roots are assumed to change frequently.
+    #[salsa::input]
+    fn local_roots(&self) -> Arc<Vec<SourceRootId>>;
+    /// The set of roots for crates.io libraries.
+    /// Files in libraries are assumed to never change.
+    #[salsa::input]
+    fn library_roots(&self) -> Arc<Vec<SourceRootId>>;
 }
 
 fn file_symbols(db: &impl SymbolsDatabase, file_id: FileId) -> Arc<SymbolIndex> {
     db.check_canceled();
-    let source_file = db.source_file(file_id);
+    let source_file = db.parse(file_id);
     let mut symbols = source_file
         .syntax()
         .descendants()
diff --git a/crates/ra_ide_api/src/syntax_highlighting.rs b/crates/ra_ide_api/src/syntax_highlighting.rs
index a4d3ad005..26bde495b 100644
--- a/crates/ra_ide_api/src/syntax_highlighting.rs
+++ b/crates/ra_ide_api/src/syntax_highlighting.rs
@@ -1,5 +1,5 @@
 use ra_syntax::{ast, AstNode,};
-use ra_db::SyntaxDatabase;
+use ra_db::SourceDatabase;
 
 use crate::{
     FileId, HighlightedRange,
@@ -7,7 +7,7 @@ use crate::{
 };
 
 pub(crate) fn highlight(db: &RootDatabase, file_id: FileId) -> Vec<HighlightedRange> {
-    let source_file = db.source_file(file_id);
+    let source_file = db.parse(file_id);
     let mut res = ra_ide_api_light::highlight(source_file.syntax());
     for macro_call in source_file
         .syntax()