10 files changed, 426 insertions, 439 deletions

diff --git a/crates/ra_ide_api/src/call_info.rs b/crates/ra_ide_api/src/call_info.rs
index 2eb388e0e..a59ab7853 100644
--- a/crates/ra_ide_api/src/call_info.rs
+++ b/crates/ra_ide_api/src/call_info.rs
@@ -20,7 +20,7 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
     let name_ref = calling_node.name_ref()?;
 
     // Resolve the function's NameRef (NOTE: this isn't entirely accurate).
-    let file_symbols = db.index_resolve(name_ref);
+    let file_symbols = crate::symbol_index::index_resolve(db, name_ref);
     let symbol = file_symbols
         .into_iter()
         .find(|it| it.ptr.kind() == FN_DEF)?;
diff --git a/crates/ra_ide_api/src/change.rs b/crates/ra_ide_api/src/change.rs
new file mode 100644
index 000000000..992955740
--- /dev/null
+++ b/crates/ra_ide_api/src/change.rs
@@ -0,0 +1,255 @@
+use std::{
+    fmt, time,
+    sync::Arc,
+};
+
+use rustc_hash::FxHashMap;
+use ra_db::{
+    SourceRootId, FileId, CrateGraph, SourceDatabase, SourceRoot,
+    salsa::{Database, SweepStrategy},
+};
+use ra_syntax::SourceFile;
+use relative_path::RelativePathBuf;
+use rayon::prelude::*;
+
+use crate::{
+    db::RootDatabase,
+    symbol_index::{SymbolIndex, SymbolsDatabase},
+    status::syntax_tree_stats,
+};
+
+#[derive(Default)]
+pub struct AnalysisChange {
+    new_roots: Vec<(SourceRootId, bool)>,
+    roots_changed: FxHashMap<SourceRootId, RootChange>,
+    files_changed: Vec<(FileId, Arc<String>)>,
+    libraries_added: Vec<LibraryData>,
+    crate_graph: Option<CrateGraph>,
+}
+
+impl fmt::Debug for AnalysisChange {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let mut d = fmt.debug_struct("AnalysisChange");
+        if !self.new_roots.is_empty() {
+            d.field("new_roots", &self.new_roots);
+        }
+        if !self.roots_changed.is_empty() {
+            d.field("roots_changed", &self.roots_changed);
+        }
+        if !self.files_changed.is_empty() {
+            d.field("files_changed", &self.files_changed.len());
+        }
+        if !self.libraries_added.is_empty() {
+            d.field("libraries_added", &self.libraries_added.len());
+        }
+        if !self.crate_graph.is_some() {
+            d.field("crate_graph", &self.crate_graph);
+        }
+        d.finish()
+    }
+}
+
+impl AnalysisChange {
+    pub fn new() -> AnalysisChange {
+        AnalysisChange::default()
+    }
+
+    pub fn add_root(&mut self, root_id: SourceRootId, is_local: bool) {
+        self.new_roots.push((root_id, is_local));
+    }
+
+    pub fn add_file(
+        &mut self,
+        root_id: SourceRootId,
+        file_id: FileId,
+        path: RelativePathBuf,
+        text: Arc<String>,
+    ) {
+        let file = AddFile {
+            file_id,
+            path,
+            text,
+        };
+        self.roots_changed
+            .entry(root_id)
+            .or_default()
+            .added
+            .push(file);
+    }
+
+    pub fn change_file(&mut self, file_id: FileId, new_text: Arc<String>) {
+        self.files_changed.push((file_id, new_text))
+    }
+
+    pub fn remove_file(&mut self, root_id: SourceRootId, file_id: FileId, path: RelativePathBuf) {
+        let file = RemoveFile { file_id, path };
+        self.roots_changed
+            .entry(root_id)
+            .or_default()
+            .removed
+            .push(file);
+    }
+
+    pub fn add_library(&mut self, data: LibraryData) {
+        self.libraries_added.push(data)
+    }
+
+    pub fn set_crate_graph(&mut self, graph: CrateGraph) {
+        self.crate_graph = Some(graph);
+    }
+}
+
+#[derive(Debug)]
+struct AddFile {
+    file_id: FileId,
+    path: RelativePathBuf,
+    text: Arc<String>,
+}
+
+#[derive(Debug)]
+struct RemoveFile {
+    file_id: FileId,
+    path: RelativePathBuf,
+}
+
+#[derive(Default)]
+struct RootChange {
+    added: Vec<AddFile>,
+    removed: Vec<RemoveFile>,
+}
+
+impl fmt::Debug for RootChange {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt.debug_struct("AnalysisChange")
+            .field("added", &self.added.len())
+            .field("removed", &self.removed.len())
+            .finish()
+    }
+}
+
+pub struct LibraryData {
+    root_id: SourceRootId,
+    root_change: RootChange,
+    symbol_index: SymbolIndex,
+}
+
+impl fmt::Debug for LibraryData {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("LibraryData")
+            .field("root_id", &self.root_id)
+            .field("root_change", &self.root_change)
+            .field("n_symbols", &self.symbol_index.len())
+            .finish()
+    }
+}
+
+impl LibraryData {
+    pub fn prepare(
+        root_id: SourceRootId,
+        files: Vec<(FileId, RelativePathBuf, Arc<String>)>,
+    ) -> LibraryData {
+        let symbol_index = SymbolIndex::for_files(files.par_iter().map(|(file_id, _, text)| {
+            let file = SourceFile::parse(text);
+            (*file_id, file)
+        }));
+        let mut root_change = RootChange::default();
+        root_change.added = files
+            .into_iter()
+            .map(|(file_id, path, text)| AddFile {
+                file_id,
+                path,
+                text,
+            })
+            .collect();
+        LibraryData {
+            root_id,
+            root_change,
+            symbol_index,
+        }
+    }
+}
+
+const GC_COOLDOWN: time::Duration = time::Duration::from_millis(100);
+
+impl RootDatabase {
+    pub(crate) fn apply_change(&mut self, change: AnalysisChange) {
+        log::info!("apply_change {:?}", change);
+        if !change.new_roots.is_empty() {
+            let mut local_roots = Vec::clone(&self.local_roots());
+            for (root_id, is_local) in change.new_roots {
+                self.set_source_root(root_id, Default::default());
+                if is_local {
+                    local_roots.push(root_id);
+                }
+            }
+            self.set_local_roots(Arc::new(local_roots));
+        }
+
+        for (root_id, root_change) in change.roots_changed {
+            self.apply_root_change(root_id, root_change);
+        }
+        for (file_id, text) in change.files_changed {
+            self.set_file_text(file_id, text)
+        }
+        if !change.libraries_added.is_empty() {
+            let mut libraries = Vec::clone(&self.library_roots());
+            for library in change.libraries_added {
+                libraries.push(library.root_id);
+                self.set_source_root(library.root_id, Default::default());
+                self.set_constant_library_symbols(library.root_id, Arc::new(library.symbol_index));
+                self.apply_root_change(library.root_id, library.root_change);
+            }
+            self.set_library_roots(Arc::new(libraries));
+        }
+        if let Some(crate_graph) = change.crate_graph {
+            self.set_crate_graph(Arc::new(crate_graph))
+        }
+    }
+
+    fn apply_root_change(&mut self, root_id: SourceRootId, root_change: RootChange) {
+        let mut source_root = SourceRoot::clone(&self.source_root(root_id));
+        for add_file in root_change.added {
+            self.set_file_text(add_file.file_id, add_file.text);
+            self.set_file_relative_path(add_file.file_id, add_file.path.clone());
+            self.set_file_source_root(add_file.file_id, root_id);
+            source_root.files.insert(add_file.path, add_file.file_id);
+        }
+        for remove_file in root_change.removed {
+            self.set_file_text(remove_file.file_id, Default::default());
+            source_root.files.remove(&remove_file.path);
+        }
+        self.set_source_root(root_id, Arc::new(source_root));
+    }
+
+    pub(crate) fn maybe_collect_garbage(&mut self) {
+        if self.last_gc_check.elapsed() > GC_COOLDOWN {
+            self.last_gc_check = time::Instant::now();
+            let retained_trees = syntax_tree_stats(self).retained;
+            if retained_trees > 100 {
+                log::info!(
+                    "automatic garbadge collection, {} retained trees",
+                    retained_trees
+                );
+                self.collect_garbage();
+            }
+        }
+    }
+
+    pub(crate) fn collect_garbage(&mut self) {
+        self.last_gc = time::Instant::now();
+
+        let sweep = SweepStrategy::default()
+            .discard_values()
+            .sweep_all_revisions();
+
+        self.query(ra_db::ParseQuery).sweep(sweep);
+
+        self.query(hir::db::HirParseQuery).sweep(sweep);
+        self.query(hir::db::FileItemsQuery).sweep(sweep);
+        self.query(hir::db::FileItemQuery).sweep(sweep);
+
+        self.query(hir::db::LowerModuleQuery).sweep(sweep);
+        self.query(hir::db::LowerModuleSourceMapQuery).sweep(sweep);
+        self.query(hir::db::BodySyntaxMappingQuery).sweep(sweep);
+    }
+}
diff --git a/crates/ra_ide_api/src/diagnostics.rs b/crates/ra_ide_api/src/diagnostics.rs
new file mode 100644
index 000000000..a499ac7c6
--- /dev/null
+++ b/crates/ra_ide_api/src/diagnostics.rs
@@ -0,0 +1,69 @@
+use hir::{Problem, source_binder};
+use ra_ide_api_light::Severity;
+use ra_db::SourceDatabase;
+
+use crate::{Diagnostic, FileId, FileSystemEdit, SourceChange, db::RootDatabase};
+
+pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic> {
+    let syntax = db.parse(file_id);
+
+    let mut res = ra_ide_api_light::diagnostics(&syntax)
+        .into_iter()
+        .map(|d| Diagnostic {
+            range: d.range,
+            message: d.msg,
+            severity: d.severity,
+            fix: d.fix.map(|fix| SourceChange::from_local_edit(file_id, fix)),
+        })
+        .collect::<Vec<_>>();
+    if let Some(m) = source_binder::module_from_file_id(db, file_id) {
+        for (name_node, problem) in m.problems(db) {
+            let source_root = db.file_source_root(file_id);
+            let diag = match problem {
+                Problem::UnresolvedModule { candidate } => {
+                    let create_file = FileSystemEdit::CreateFile {
+                        source_root,
+                        path: candidate.clone(),
+                    };
+                    let fix = SourceChange {
+                        label: "create module".to_string(),
+                        source_file_edits: Vec::new(),
+                        file_system_edits: vec![create_file],
+                        cursor_position: None,
+                    };
+                    Diagnostic {
+                        range: name_node.range(),
+                        message: "unresolved module".to_string(),
+                        severity: Severity::Error,
+                        fix: Some(fix),
+                    }
+                }
+                Problem::NotDirOwner { move_to, candidate } => {
+                    let move_file = FileSystemEdit::MoveFile {
+                        src: file_id,
+                        dst_source_root: source_root,
+                        dst_path: move_to.clone(),
+                    };
+                    let create_file = FileSystemEdit::CreateFile {
+                        source_root,
+                        path: move_to.join(candidate),
+                    };
+                    let fix = SourceChange {
+                        label: "move file and create module".to_string(),
+                        source_file_edits: Vec::new(),
+                        file_system_edits: vec![move_file, create_file],
+                        cursor_position: None,
+                    };
+                    Diagnostic {
+                        range: name_node.range(),
+                        message: "can't declare module at this location".to_string(),
+                        severity: Severity::Error,
+                        fix: Some(fix),
+                    }
+                }
+            };
+            res.push(diag)
+        }
+    };
+    res
+}
diff --git a/crates/ra_ide_api/src/goto_definition.rs b/crates/ra_ide_api/src/goto_definition.rs
index 681f36623..69f2d2bf6 100644
--- a/crates/ra_ide_api/src/goto_definition.rs
+++ b/crates/ra_ide_api/src/goto_definition.rs
@@ -118,8 +118,7 @@ pub(crate) fn reference_definition(
         }
     }
     // If that fails try the index based approach.
-    let navs = db
-        .index_resolve(name_ref)
+    let navs = crate::symbol_index::index_resolve(db, name_ref)
         .into_iter()
         .map(NavigationTarget::from_symbol)
         .collect();
diff --git a/crates/ra_ide_api/src/imp.rs b/crates/ra_ide_api/src/imp.rs
deleted file mode 100644
index b139efabf..000000000
--- a/crates/ra_ide_api/src/imp.rs
+++ /dev/null
@@ -1,263 +0,0 @@
-use std::{
-    sync::Arc,
-    time,
-};
-
-use hir::{
-    self, Problem, source_binder
-};
-use ra_db::{
-    SourceDatabase, SourceRoot, SourceRootId,
-    salsa::{Database, SweepStrategy},
-};
-use ra_ide_api_light::{self, LocalEdit, Severity};
-use ra_syntax::{
-    algo::find_node_at_offset, ast::{self, NameOwner}, AstNode,
-    SourceFile,
-    TextRange,
-};
-
-use crate::{
-    AnalysisChange,
-    CrateId, db, Diagnostic, FileId, FilePosition, FileSystemEdit,
-    Query, RootChange, SourceChange, SourceFileEdit,
-    symbol_index::{FileSymbol, SymbolsDatabase},
-    status::syntax_tree_stats
-};
-
-const GC_COOLDOWN: time::Duration = time::Duration::from_millis(100);
-
-impl db::RootDatabase {
-    pub(crate) fn apply_change(&mut self, change: AnalysisChange) {
-        log::info!("apply_change {:?}", change);
-        if !change.new_roots.is_empty() {
-            let mut local_roots = Vec::clone(&self.local_roots());
-            for (root_id, is_local) in change.new_roots {
-                self.set_source_root(root_id, Default::default());
-                if is_local {
-                    local_roots.push(root_id);
-                }
-            }
-            self.set_local_roots(Arc::new(local_roots));
-        }
-
-        for (root_id, root_change) in change.roots_changed {
-            self.apply_root_change(root_id, root_change);
-        }
-        for (file_id, text) in change.files_changed {
-            self.set_file_text(file_id, text)
-        }
-        if !change.libraries_added.is_empty() {
-            let mut libraries = Vec::clone(&self.library_roots());
-            for library in change.libraries_added {
-                libraries.push(library.root_id);
-                self.set_source_root(library.root_id, Default::default());
-                self.set_constant_library_symbols(library.root_id, Arc::new(library.symbol_index));
-                self.apply_root_change(library.root_id, library.root_change);
-            }
-            self.set_library_roots(Arc::new(libraries));
-        }
-        if let Some(crate_graph) = change.crate_graph {
-            self.set_crate_graph(Arc::new(crate_graph))
-        }
-    }
-
-    fn apply_root_change(&mut self, root_id: SourceRootId, root_change: RootChange) {
-        let mut source_root = SourceRoot::clone(&self.source_root(root_id));
-        for add_file in root_change.added {
-            self.set_file_text(add_file.file_id, add_file.text);
-            self.set_file_relative_path(add_file.file_id, add_file.path.clone());
-            self.set_file_source_root(add_file.file_id, root_id);
-            source_root.files.insert(add_file.path, add_file.file_id);
-        }
-        for remove_file in root_change.removed {
-            self.set_file_text(remove_file.file_id, Default::default());
-            source_root.files.remove(&remove_file.path);
-        }
-        self.set_source_root(root_id, Arc::new(source_root));
-    }
-
-    pub(crate) fn maybe_collect_garbage(&mut self) {
-        if self.last_gc_check.elapsed() > GC_COOLDOWN {
-            self.last_gc_check = time::Instant::now();
-            let retained_trees = syntax_tree_stats(self).retained;
-            if retained_trees > 100 {
-                log::info!(
-                    "automatic garbadge collection, {} retained trees",
-                    retained_trees
-                );
-                self.collect_garbage();
-            }
-        }
-    }
-
-    pub(crate) fn collect_garbage(&mut self) {
-        self.last_gc = time::Instant::now();
-
-        let sweep = SweepStrategy::default()
-            .discard_values()
-            .sweep_all_revisions();
-
-        self.query(ra_db::ParseQuery).sweep(sweep);
-
-        self.query(hir::db::HirParseQuery).sweep(sweep);
-        self.query(hir::db::FileItemsQuery).sweep(sweep);
-        self.query(hir::db::FileItemQuery).sweep(sweep);
-
-        self.query(hir::db::LowerModuleQuery).sweep(sweep);
-        self.query(hir::db::LowerModuleSourceMapQuery).sweep(sweep);
-        self.query(hir::db::BodySyntaxMappingQuery).sweep(sweep);
-    }
-}
-
-impl db::RootDatabase {
-    /// Returns `Vec` for the same reason as `parent_module`
-    pub(crate) fn crate_for(&self, file_id: FileId) -> Vec<CrateId> {
-        let module = match source_binder::module_from_file_id(self, file_id) {
-            Some(it) => it,
-            None => return Vec::new(),
-        };
-        let krate = match module.krate(self) {
-            Some(it) => it,
-            None => return Vec::new(),
-        };
-        vec![krate.crate_id()]
-    }
-
-    pub(crate) fn find_all_refs(&self, position: FilePosition) -> Vec<(FileId, TextRange)> {
-        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(),
-            Some(it) => it,
-        };
-
-        let mut ret = binding
-            .name()
-            .into_iter()
-            .map(|name| (position.file_id, name.syntax().range()))
-            .collect::<Vec<_>>();
-        ret.extend(
-            descr
-                .scopes(self)
-                .find_all_refs(binding)
-                .into_iter()
-                .map(|ref_desc| (position.file_id, ref_desc.range)),
-        );
-
-        return ret;
-
-        fn find_binding<'a>(
-            db: &db::RootDatabase,
-            source_file: &'a SourceFile,
-            position: FilePosition,
-        ) -> Option<(&'a ast::BindPat, hir::Function)> {
-            let syntax = source_file.syntax();
-            if let Some(binding) = find_node_at_offset::<ast::BindPat>(syntax, position.offset) {
-                let descr = source_binder::function_from_child_node(
-                    db,
-                    position.file_id,
-                    binding.syntax(),
-                )?;
-                return Some((binding, descr));
-            };
-            let name_ref = find_node_at_offset::<ast::NameRef>(syntax, position.offset)?;
-            let descr =
-                source_binder::function_from_child_node(db, position.file_id, name_ref.syntax())?;
-            let scope = descr.scopes(db);
-            let resolved = scope.resolve_local_name(name_ref)?;
-            let resolved = resolved.ptr().to_node(source_file);
-            let binding = find_node_at_offset::<ast::BindPat>(syntax, resolved.range().end())?;
-            Some((binding, descr))
-        }
-    }
-
-    pub(crate) fn diagnostics(&self, file_id: FileId) -> Vec<Diagnostic> {
-        let syntax = self.parse(file_id);
-
-        let mut res = ra_ide_api_light::diagnostics(&syntax)
-            .into_iter()
-            .map(|d| Diagnostic {
-                range: d.range,
-                message: d.msg,
-                severity: d.severity,
-                fix: d.fix.map(|fix| SourceChange::from_local_edit(file_id, fix)),
-            })
-            .collect::<Vec<_>>();
-        if let Some(m) = source_binder::module_from_file_id(self, file_id) {
-            for (name_node, problem) in m.problems(self) {
-                let source_root = self.file_source_root(file_id);
-                let diag = match problem {
-                    Problem::UnresolvedModule { candidate } => {
-                        let create_file = FileSystemEdit::CreateFile {
-                            source_root,
-                            path: candidate.clone(),
-                        };
-                        let fix = SourceChange {
-                            label: "create module".to_string(),
-                            source_file_edits: Vec::new(),
-                            file_system_edits: vec![create_file],
-                            cursor_position: None,
-                        };
-                        Diagnostic {
-                            range: name_node.range(),
-                            message: "unresolved module".to_string(),
-                            severity: Severity::Error,
-                            fix: Some(fix),
-                        }
-                    }
-                    Problem::NotDirOwner { move_to, candidate } => {
-                        let move_file = FileSystemEdit::MoveFile {
-                            src: file_id,
-                            dst_source_root: source_root,
-                            dst_path: move_to.clone(),
-                        };
-                        let create_file = FileSystemEdit::CreateFile {
-                            source_root,
-                            path: move_to.join(candidate),
-                        };
-                        let fix = SourceChange {
-                            label: "move file and create module".to_string(),
-                            source_file_edits: Vec::new(),
-                            file_system_edits: vec![move_file, create_file],
-                            cursor_position: None,
-                        };
-                        Diagnostic {
-                            range: name_node.range(),
-                            message: "can't declare module at this location".to_string(),
-                            severity: Severity::Error,
-                            fix: Some(fix),
-                        }
-                    }
-                };
-                res.push(diag)
-            }
-        };
-        res
-    }
-
-    pub(crate) fn index_resolve(&self, name_ref: &ast::NameRef) -> Vec<FileSymbol> {
-        let name = name_ref.text();
-        let mut query = Query::new(name.to_string());
-        query.exact();
-        query.limit(4);
-        crate::symbol_index::world_symbols(self, query)
-    }
-}
-
-impl SourceChange {
-    pub(crate) fn from_local_edit(file_id: FileId, edit: LocalEdit) -> SourceChange {
-        let file_edit = SourceFileEdit {
-            file_id,
-            edit: edit.edit,
-        };
-        SourceChange {
-            label: edit.label,
-            source_file_edits: vec![file_edit],
-            file_system_edits: vec![],
-            cursor_position: edit
-                .cursor_position
-                .map(|offset| FilePosition { offset, file_id }),
-        }
-    }
-}
diff --git a/crates/ra_ide_api/src/impls.rs b/crates/ra_ide_api/src/impls.rs
index 91fa41f1f..4fb054139 100644
--- a/crates/ra_ide_api/src/impls.rs
+++ b/crates/ra_ide_api/src/impls.rs
@@ -1,4 +1,4 @@
-use ra_db::{SourceDatabase};
+use ra_db::SourceDatabase;
 use ra_syntax::{
     AstNode, ast,
     algo::find_node_at_offset,
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index 68d59aae1..1f43b7623 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -14,10 +14,10 @@
 #![recursion_limit = "128"]
 
 mod db;
-mod imp;
 pub mod mock_analysis;
 mod symbol_index;
 mod navigation_target;
+mod change;
 
 mod status;
 mod completion;
@@ -28,14 +28,15 @@ mod hover;
 mod call_info;
 mod syntax_highlighting;
 mod parent_module;
-mod rename;
+mod references;
 mod impls;
 mod assists;
+mod diagnostics;
 
 #[cfg(test)]
 mod marks;
 
-use std::{fmt, sync::Arc};
+use std::sync::Arc;
 
 use ra_syntax::{SourceFile, TreeArc, TextRange, TextUnit};
 use ra_text_edit::TextEdit;
@@ -43,22 +44,21 @@ use ra_db::{
     SourceDatabase, CheckCanceled,
     salsa::{self, ParallelDatabase},
 };
-use rayon::prelude::*;
 use relative_path::RelativePathBuf;
-use rustc_hash::FxHashMap;
 
 use crate::{
-    symbol_index::{FileSymbol, SymbolIndex},
+    symbol_index::FileSymbol,
     db::LineIndexDatabase,
 };
 
 pub use crate::{
+    change::{AnalysisChange, LibraryData},
     completion::{CompletionItem, CompletionItemKind, InsertTextFormat},
     runnables::{Runnable, RunnableKind},
     navigation_target::NavigationTarget,
 };
 pub use ra_ide_api_light::{
-    Fold, FoldKind, HighlightedRange, Severity, StructureNode,
+    Fold, FoldKind, HighlightedRange, Severity, StructureNode, LocalEdit,
     LineIndex, LineCol, translate_offset_with_edit,
 };
 pub use ra_db::{
@@ -74,115 +74,6 @@ static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
 pub type Cancelable<T> = Result<T, Canceled>;
 
-#[derive(Default)]
-pub struct AnalysisChange {
-    new_roots: Vec<(SourceRootId, bool)>,
-    roots_changed: FxHashMap<SourceRootId, RootChange>,
-    files_changed: Vec<(FileId, Arc<String>)>,
-    libraries_added: Vec<LibraryData>,
-    crate_graph: Option<CrateGraph>,
-}
-
-#[derive(Default)]
-struct RootChange {
-    added: Vec<AddFile>,
-    removed: Vec<RemoveFile>,
-}
-
-#[derive(Debug)]
-struct AddFile {
-    file_id: FileId,
-    path: RelativePathBuf,
-    text: Arc<String>,
-}
-
-#[derive(Debug)]
-struct RemoveFile {
-    file_id: FileId,
-    path: RelativePathBuf,
-}
-
-impl fmt::Debug for AnalysisChange {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        let mut d = fmt.debug_struct("AnalysisChange");
-        if !self.new_roots.is_empty() {
-            d.field("new_roots", &self.new_roots);
-        }
-        if !self.roots_changed.is_empty() {
-            d.field("roots_changed", &self.roots_changed);
-        }
-        if !self.files_changed.is_empty() {
-            d.field("files_changed", &self.files_changed.len());
-        }
-        if !self.libraries_added.is_empty() {
-            d.field("libraries_added", &self.libraries_added.len());
-        }
-        if self.crate_graph.is_none() {
-            d.field("crate_graph", &self.crate_graph);
-        }
-        d.finish()
-    }
-}
-
-impl fmt::Debug for RootChange {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        fmt.debug_struct("AnalysisChange")
-            .field("added", &self.added.len())
-            .field("removed", &self.removed.len())
-            .finish()
-    }
-}
-
-impl AnalysisChange {
-    pub fn new() -> AnalysisChange {
-        AnalysisChange::default()
-    }
-
-    pub fn add_root(&mut self, root_id: SourceRootId, is_local: bool) {
-        self.new_roots.push((root_id, is_local));
-    }
-
-    pub fn add_file(
-        &mut self,
-        root_id: SourceRootId,
-        file_id: FileId,
-        path: RelativePathBuf,
-        text: Arc<String>,
-    ) {
-        let file = AddFile {
-            file_id,
-            path,
-            text,
-        };
-        self.roots_changed
-            .entry(root_id)
-            .or_default()
-            .added
-            .push(file);
-    }
-
-    pub fn change_file(&mut self, file_id: FileId, new_text: Arc<String>) {
-        self.files_changed.push((file_id, new_text))
-    }
-
-    pub fn remove_file(&mut self, root_id: SourceRootId, file_id: FileId, path: RelativePathBuf) {
-        let file = RemoveFile { file_id, path };
-        self.roots_changed
-            .entry(root_id)
-            .or_default()
-            .removed
-            .push(file);
-    }
-
-    pub fn add_library(&mut self, data: LibraryData) {
-        self.libraries_added.push(data)
-    }
-
-    pub fn set_crate_graph(&mut self, graph: CrateGraph) {
-        self.crate_graph = Some(graph);
-    }
-}
-
 #[derive(Debug)]
 pub struct SourceChange {
     pub label: String,
@@ -431,7 +322,7 @@ impl Analysis {
 
     /// Finds all usages of the reference at point.
     pub fn find_all_refs(&self, position: FilePosition) -> Cancelable<Vec<(FileId, TextRange)>> {
-        self.with_db(|db| db.find_all_refs(position))
+        self.with_db(|db| references::find_all_refs(db, position))
     }
 
     /// Returns a short text descrbing element at position.
@@ -451,7 +342,7 @@ impl Analysis {
 
     /// Returns crates this file belongs too.
     pub fn crate_for(&self, file_id: FileId) -> Cancelable<Vec<CrateId>> {
-        self.with_db(|db| db.crate_for(file_id))
+        self.with_db(|db| parent_module::crate_for(db, file_id))
     }
 
     /// Returns the root file of the given crate.
@@ -482,7 +373,7 @@ impl Analysis {
 
     /// Computes the set of diagnostics for the given file.
     pub fn diagnostics(&self, file_id: FileId) -> Cancelable<Vec<Diagnostic>> {
-        self.with_db(|db| db.diagnostics(file_id))
+        self.with_db(|db| diagnostics::diagnostics(db, file_id))
     }
 
     /// Computes the type of the expression at the given position.
@@ -497,7 +388,7 @@ impl Analysis {
         position: FilePosition,
         new_name: &str,
     ) -> Cancelable<Option<SourceChange>> {
-        self.with_db(|db| rename::rename(db, position, new_name))
+        self.with_db(|db| references::rename(db, position, new_name))
     }
 
     fn with_db<F: FnOnce(&db::RootDatabase) -> T + std::panic::UnwindSafe, T>(
@@ -508,44 +399,19 @@ impl Analysis {
     }
 }
 
-pub struct LibraryData {
-    root_id: SourceRootId,
-    root_change: RootChange,
-    symbol_index: SymbolIndex,
-}
-
-impl fmt::Debug for LibraryData {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_struct("LibraryData")
-            .field("root_id", &self.root_id)
-            .field("root_change", &self.root_change)
-            .field("n_symbols", &self.symbol_index.len())
-            .finish()
-    }
-}
-
-impl LibraryData {
-    pub fn prepare(
-        root_id: SourceRootId,
-        files: Vec<(FileId, RelativePathBuf, Arc<String>)>,
-    ) -> LibraryData {
-        let symbol_index = SymbolIndex::for_files(files.par_iter().map(|(file_id, _, text)| {
-            let file = SourceFile::parse(text);
-            (*file_id, file)
-        }));
-        let mut root_change = RootChange::default();
-        root_change.added = files
-            .into_iter()
-            .map(|(file_id, path, text)| AddFile {
-                file_id,
-                path,
-                text,
-            })
-            .collect();
-        LibraryData {
-            root_id,
-            root_change,
-            symbol_index,
+impl SourceChange {
+    pub(crate) fn from_local_edit(file_id: FileId, edit: LocalEdit) -> SourceChange {
+        let file_edit = SourceFileEdit {
+            file_id,
+            edit: edit.edit,
+        };
+        SourceChange {
+            label: edit.label,
+            source_file_edits: vec![file_edit],
+            file_system_edits: vec![],
+            cursor_position: edit
+                .cursor_position
+                .map(|offset| FilePosition { offset, file_id }),
         }
     }
 }
diff --git a/crates/ra_ide_api/src/parent_module.rs b/crates/ra_ide_api/src/parent_module.rs
index e94297fe3..603c3db6a 100644
--- a/crates/ra_ide_api/src/parent_module.rs
+++ b/crates/ra_ide_api/src/parent_module.rs
@@ -1,4 +1,4 @@
-use ra_db::FilePosition;
+use ra_db::{FilePosition, FileId, CrateId};
 
 use crate::{NavigationTarget, db::RootDatabase};
 
@@ -13,6 +13,19 @@ pub(crate) fn parent_module(db: &RootDatabase, position: FilePosition) -> Vec<Na
     vec![nav]
 }
 
+/// Returns `Vec` for the same reason as `parent_module`
+pub(crate) fn crate_for(db: &RootDatabase, file_id: FileId) -> Vec<CrateId> {
+    let module = match hir::source_binder::module_from_file_id(db, file_id) {
+        Some(it) => it,
+        None => return Vec::new(),
+    };
+    let krate = match module.krate(db) {
+        Some(it) => it,
+        None => return Vec::new(),
+    };
+    vec![krate.crate_id()]
+}
+
 #[cfg(test)]
 mod tests {
     use crate::mock_analysis::analysis_and_position;
diff --git a/crates/ra_ide_api/src/rename.rs b/crates/ra_ide_api/src/references.rs
index 1c9491a0a..b129f3134 100644
--- a/crates/ra_ide_api/src/rename.rs
+++ b/crates/ra_ide_api/src/references.rs
@@ -1,13 +1,10 @@
-use relative_path::RelativePathBuf;
-
-use hir::{
-    self, ModuleSource, source_binder::module_from_declaration,
-};
+use relative_path::{RelativePath, RelativePathBuf};
+use hir::{ModuleSource, source_binder};
+use ra_db::{FileId, SourceDatabase};
 use ra_syntax::{
+    AstNode, SyntaxNode, TextRange, SourceFile,
+    ast::{self, NameOwner},
     algo::find_node_at_offset,
-    ast,
-    AstNode,
-    SyntaxNode
 };
 
 use crate::{
@@ -17,8 +14,51 @@ use crate::{
     SourceChange,
     SourceFileEdit,
 };
-use ra_db::SourceDatabase;
-use relative_path::RelativePath;
+
+pub(crate) fn find_all_refs(db: &RootDatabase, position: FilePosition) -> Vec<(FileId, TextRange)> {
+    let file = db.parse(position.file_id);
+    // Find the binding associated with the offset
+    let (binding, descr) = match find_binding(db, &file, position) {
+        None => return Vec::new(),
+        Some(it) => it,
+    };
+
+    let mut ret = binding
+        .name()
+        .into_iter()
+        .map(|name| (position.file_id, name.syntax().range()))
+        .collect::<Vec<_>>();
+    ret.extend(
+        descr
+            .scopes(db)
+            .find_all_refs(binding)
+            .into_iter()
+            .map(|ref_desc| (position.file_id, ref_desc.range)),
+    );
+
+    return ret;
+
+    fn find_binding<'a>(
+        db: &RootDatabase,
+        source_file: &'a SourceFile,
+        position: FilePosition,
+    ) -> Option<(&'a ast::BindPat, hir::Function)> {
+        let syntax = source_file.syntax();
+        if let Some(binding) = find_node_at_offset::<ast::BindPat>(syntax, position.offset) {
+            let descr =
+                source_binder::function_from_child_node(db, position.file_id, binding.syntax())?;
+            return Some((binding, descr));
+        };
+        let name_ref = find_node_at_offset::<ast::NameRef>(syntax, position.offset)?;
+        let descr =
+            source_binder::function_from_child_node(db, position.file_id, name_ref.syntax())?;
+        let scope = descr.scopes(db);
+        let resolved = scope.resolve_local_name(name_ref)?;
+        let resolved = resolved.ptr().to_node(source_file);
+        let binding = find_node_at_offset::<ast::BindPat>(syntax, resolved.range().end())?;
+        Some((binding, descr))
+    }
+}
 
 pub(crate) fn rename(
     db: &RootDatabase,
@@ -57,7 +97,8 @@ fn rename_mod(
 ) -> Option<SourceChange> {
     let mut source_file_edits = Vec::new();
     let mut file_system_edits = Vec::new();
-    if let Some(module) = module_from_declaration(db, position.file_id, &ast_module) {
+    if let Some(module) = source_binder::module_from_declaration(db, position.file_id, &ast_module)
+    {
         let (file_id, module_source) = module.definition_source(db);
         match module_source {
             ModuleSource::SourceFile(..) => {
@@ -108,8 +149,7 @@ fn rename_reference(
     position: FilePosition,
     new_name: &str,
 ) -> Option<SourceChange> {
-    let edit = db
-        .find_all_refs(position)
+    let edit = find_all_refs(db, position)
         .iter()
         .map(|(file_id, text_range)| SourceFileEdit {
             file_id: *file_id,
diff --git a/crates/ra_ide_api/src/symbol_index.rs b/crates/ra_ide_api/src/symbol_index.rs
index 9f939c650..3d0b2369e 100644
--- a/crates/ra_ide_api/src/symbol_index.rs
+++ b/crates/ra_ide_api/src/symbol_index.rs
@@ -109,6 +109,14 @@ pub(crate) fn world_symbols(db: &RootDatabase, query: Query) -> Vec<FileSymbol>
     query.search(&buf)
 }
 
+pub(crate) fn index_resolve(db: &RootDatabase, name_ref: &ast::NameRef) -> Vec<FileSymbol> {
+    let name = name_ref.text();
+    let mut query = Query::new(name.to_string());
+    query.exact();
+    query.limit(4);
+    crate::symbol_index::world_symbols(db, query)
+}
+
 #[derive(Default, Debug)]
 pub(crate) struct SymbolIndex {
     symbols: Vec<FileSymbol>,