Implement proposed CallHierarchy feature

See: https://github.com/microsoft/vscode-languageserver-node/blob/master/protocol/src/protocol.callHierarchy.proposed.ts

11 files changed, 502 insertions, 15 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 159b65d01..c570e0c3c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1032,6 +1032,7 @@ dependencies = [
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "format-buf 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fst 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "indexmap 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "insta 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "join_to_string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/crates/ra_ide/Cargo.toml b/crates/ra_ide/Cargo.toml
index e3439ae31..2c9f9dce0 100644
--- a/crates/ra_ide/Cargo.toml
+++ b/crates/ra_ide/Cargo.toml
@@ -13,6 +13,7 @@ wasm = []
 [dependencies]
 either = "1.5"
 format-buf = "1.0.0"
+indexmap = "1.3.0"
 itertools = "0.8.0"
 join_to_string = "0.1.3"
 log = "0.4.5"
diff --git a/crates/ra_ide/src/call_hierarchy.rs b/crates/ra_ide/src/call_hierarchy.rs
new file mode 100644
index 000000000..75658c20b
--- /dev/null
+++ b/crates/ra_ide/src/call_hierarchy.rs
@@ -0,0 +1,337 @@
+//! Entry point for call-hierarchy
+
+use indexmap::IndexMap;
+
+use hir::db::AstDatabase;
+use ra_syntax::{
+    ast::{self, DocCommentsOwner},
+    match_ast, AstNode, TextRange,
+};
+
+use crate::{
+    call_info::FnCallNode,
+    db::RootDatabase,
+    display::{ShortLabel, ToNav},
+    expand::descend_into_macros,
+    goto_definition, references, FilePosition, NavigationTarget, RangeInfo,
+};
+
+#[derive(Default)]
+struct CallLocations {
+    funcs: IndexMap<NavigationTarget, Vec<TextRange>>,
+}
+
+impl CallLocations {
+    pub fn add(&mut self, target: &NavigationTarget, range: TextRange) {
+        self.funcs.entry(target.clone()).or_default().push(range);
+    }
+
+    pub fn into_items(self) -> Vec<CallItem> {
+        self.funcs.into_iter().map(|(target, ranges)| CallItem { target, ranges }).collect()
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct CallItem {
+    pub target: NavigationTarget,
+    pub ranges: Vec<TextRange>,
+}
+
+impl CallItem {
+    #[cfg(test)]
+    pub(crate) fn assert_match(&self, expected: &str) {
+        let actual = self.debug_render();
+        test_utils::assert_eq_text!(expected.trim(), actual.trim(),);
+    }
+
+    #[cfg(test)]
+    pub(crate) fn debug_render(&self) -> String {
+        format!("{} : {:?}", self.target.debug_render(), self.ranges)
+    }
+}
+
+pub(crate) fn call_hierarchy(
+    db: &RootDatabase,
+    position: FilePosition,
+) -> Option<RangeInfo<Vec<NavigationTarget>>> {
+    goto_definition::goto_definition(db, position)
+}
+
+pub(crate) fn incoming_calls(db: &RootDatabase, position: FilePosition) -> Option<Vec<CallItem>> {
+    // 1. Find all refs
+    // 2. Loop through refs and determine unique fndef. This will become our `from: CallHierarchyItem,` in the reply.
+    // 3. Add ranges relative to the start of the fndef.
+    let refs = references::find_all_refs(db, position, None)?;
+
+    let mut calls = CallLocations::default();
+
+    for reference in refs.info.references() {
+        let file_id = reference.file_range.file_id;
+        let file = db.parse_or_expand(file_id.into())?;
+        let token = file.token_at_offset(reference.file_range.range.start()).next()?;
+        let token = descend_into_macros(db, file_id, token);
+        let syntax = token.value.parent();
+
+        // This target is the containing function
+        if let Some(nav) = syntax.ancestors().find_map(|node| {
+            match_ast! {
+                match node {
+                    ast::FnDef(it) => {
+                        Some(NavigationTarget::from_named(
+                            db,
+                            token.with_value(&it),
+                            it.doc_comment_text(),
+                            it.short_label(),
+                        ))
+                    },
+                    _ => { None },
+                }
+            }
+        }) {
+            let relative_range = reference.file_range.range;
+            calls.add(&nav, relative_range);
+        }
+    }
+
+    Some(calls.into_items())
+}
+
+pub(crate) fn outgoing_calls(db: &RootDatabase, position: FilePosition) -> Option<Vec<CallItem>> {
+    let file_id = position.file_id;
+    let file = db.parse_or_expand(file_id.into())?;
+    let token = file.token_at_offset(position.offset).next()?;
+    let token = descend_into_macros(db, file_id, token);
+    let syntax = token.value.parent();
+
+    let mut calls = CallLocations::default();
+
+    syntax
+        .descendants()
+        .filter_map(|node| FnCallNode::with_node_exact(&node))
+        .filter_map(|call_node| {
+            let name_ref = call_node.name_ref()?;
+            let name_ref = token.with_value(name_ref.syntax());
+
+            let analyzer = hir::SourceAnalyzer::new(db, name_ref, None);
+
+            if let Some(func_target) = match &call_node {
+                FnCallNode::CallExpr(expr) => {
+                    //FIXME: Type::as_callable is broken
+                    let callable_def = analyzer.type_of(db, &expr.expr()?)?.as_callable()?;
+                    match callable_def {
+                        hir::CallableDef::FunctionId(it) => {
+                            let fn_def: hir::Function = it.into();
+                            let nav = fn_def.to_nav(db);
+                            Some(nav)
+                        }
+                        _ => None,
+                    }
+                }
+                FnCallNode::MethodCallExpr(expr) => {
+                    let function = analyzer.resolve_method_call(&expr)?;
+                    Some(function.to_nav(db))
+                }
+                FnCallNode::MacroCallExpr(expr) => {
+                    let macro_def = analyzer.resolve_macro_call(db, name_ref.with_value(&expr))?;
+                    Some(macro_def.to_nav(db))
+                }
+            } {
+                Some((func_target.clone(), name_ref.value.text_range()))
+            } else {
+                None
+            }
+        })
+        .for_each(|(nav, range)| calls.add(&nav, range));
+
+    Some(calls.into_items())
+}
+
+#[cfg(test)]
+mod tests {
+    use ra_db::FilePosition;
+
+    use crate::mock_analysis::analysis_and_position;
+
+    fn check_hierarchy(
+        fixture: &str,
+        expected: &str,
+        expected_incoming: &[&str],
+        expected_outgoing: &[&str],
+    ) {
+        let (analysis, pos) = analysis_and_position(fixture);
+
+        let mut navs = analysis.call_hierarchy(pos).unwrap().unwrap().info;
+        assert_eq!(navs.len(), 1);
+        let nav = navs.pop().unwrap();
+        nav.assert_match(expected);
+
+        let item_pos = FilePosition { file_id: nav.file_id(), offset: nav.range().start() };
+        let incoming_calls = analysis.incoming_calls(item_pos).unwrap().unwrap();
+        assert_eq!(incoming_calls.len(), expected_incoming.len());
+
+        for call in 0..incoming_calls.len() {
+            incoming_calls[call].assert_match(expected_incoming[call]);
+        }
+
+        let outgoing_calls = analysis.outgoing_calls(item_pos).unwrap().unwrap();
+        assert_eq!(outgoing_calls.len(), expected_outgoing.len());
+
+        for call in 0..outgoing_calls.len() {
+            outgoing_calls[call].assert_match(expected_outgoing[call]);
+        }
+    }
+
+    #[test]
+    fn test_call_hierarchy_on_ref() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            fn callee() {}
+            fn caller() {
+                call<|>ee();
+            }
+            "#,
+            "callee FN_DEF FileId(1) [0; 14) [3; 9)",
+            &["caller FN_DEF FileId(1) [15; 44) [18; 24) : [[33; 39)]"],
+            &[],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_on_def() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            fn call<|>ee() {}
+            fn caller() {
+                callee();
+            }
+            "#,
+            "callee FN_DEF FileId(1) [0; 14) [3; 9)",
+            &["caller FN_DEF FileId(1) [15; 44) [18; 24) : [[33; 39)]"],
+            &[],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_in_same_fn() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            fn callee() {}
+            fn caller() {
+                call<|>ee();
+                callee();
+            }
+            "#,
+            "callee FN_DEF FileId(1) [0; 14) [3; 9)",
+            &["caller FN_DEF FileId(1) [15; 58) [18; 24) : [[33; 39), [47; 53)]"],
+            &[],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_in_different_fn() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            fn callee() {}
+            fn caller1() {
+                call<|>ee();
+            }
+
+            fn caller2() {
+                callee();
+            }
+            "#,
+            "callee FN_DEF FileId(1) [0; 14) [3; 9)",
+            &[
+                "caller1 FN_DEF FileId(1) [15; 45) [18; 25) : [[34; 40)]",
+                "caller2 FN_DEF FileId(1) [46; 76) [49; 56) : [[65; 71)]",
+            ],
+            &[],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_in_different_files() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            mod foo;
+            use foo::callee;
+
+            fn caller() {
+                call<|>ee();
+            }
+
+            //- /foo/mod.rs
+            pub fn callee() {}
+            "#,
+            "callee FN_DEF FileId(2) [0; 18) [7; 13)",
+            &["caller FN_DEF FileId(1) [26; 55) [29; 35) : [[44; 50)]"],
+            &[],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_outgoing() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            fn callee() {}
+            fn call<|>er() {
+                callee();
+                callee();
+            }
+            "#,
+            "caller FN_DEF FileId(1) [15; 58) [18; 24)",
+            &[],
+            &["callee FN_DEF FileId(1) [0; 14) [3; 9) : [[33; 39), [47; 53)]"],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_outgoing_in_different_files() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            mod foo;
+            use foo::callee;
+
+            fn call<|>er() {
+                callee();
+            }
+
+            //- /foo/mod.rs
+            pub fn callee() {}
+            "#,
+            "caller FN_DEF FileId(1) [26; 55) [29; 35)",
+            &[],
+            &["callee FN_DEF FileId(2) [0; 18) [7; 13) : [[44; 50)]"],
+        );
+    }
+
+    #[test]
+    fn test_call_hierarchy_incoming_outgoing() {
+        check_hierarchy(
+            r#"
+            //- /lib.rs
+            fn caller1() {
+                call<|>er2();
+            }
+
+            fn caller2() {
+                caller3();
+            }
+
+            fn caller3() {
+
+            }
+            "#,
+            "caller2 FN_DEF FileId(1) [32; 63) [35; 42)",
+            &["caller1 FN_DEF FileId(1) [0; 31) [3; 10) : [[19; 26)]"],
+            &["caller3 FN_DEF FileId(1) [64; 80) [67; 74) : [[51; 58)]"],
+        );
+    }
+}
diff --git a/crates/ra_ide/src/call_info.rs b/crates/ra_ide/src/call_info.rs
index 2c2b6fa48..a7023529b 100644
--- a/crates/ra_ide/src/call_info.rs
+++ b/crates/ra_ide/src/call_info.rs
@@ -88,7 +88,7 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
 }
 
 #[derive(Debug)]
-enum FnCallNode {
+pub(crate) enum FnCallNode {
     CallExpr(ast::CallExpr),
     MethodCallExpr(ast::MethodCallExpr),
     MacroCallExpr(ast::MacroCall),
@@ -108,7 +108,18 @@ impl FnCallNode {
         })
     }
 
-    fn name_ref(&self) -> Option<ast::NameRef> {
+    pub(crate) fn with_node_exact(node: &SyntaxNode) -> Option<FnCallNode> {
+        match_ast! {
+            match node {
+                ast::CallExpr(it) => { Some(FnCallNode::CallExpr(it)) },
+                ast::MethodCallExpr(it) => { Some(FnCallNode::MethodCallExpr(it)) },
+                ast::MacroCall(it) => { Some(FnCallNode::MacroCallExpr(it)) },
+                _ => { None },
+            }
+        }
+    }
+
+    pub(crate) fn name_ref(&self) -> Option<ast::NameRef> {
         match self {
             FnCallNode::CallExpr(call_expr) => Some(match call_expr.expr()? {
                 ast::Expr::PathExpr(path_expr) => path_expr.path()?.segment()?.name_ref()?,
diff --git a/crates/ra_ide/src/display/navigation_target.rs b/crates/ra_ide/src/display/navigation_target.rs
index b9ae67828..f2e45fa31 100644
--- a/crates/ra_ide/src/display/navigation_target.rs
+++ b/crates/ra_ide/src/display/navigation_target.rs
@@ -19,7 +19,7 @@ use super::short_label::ShortLabel;
 ///
 /// Typically, a `NavigationTarget` corresponds to some element in the source
 /// code, like a function or a struct, but this is not strictly required.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct NavigationTarget {
     file_id: FileId,
     name: SmolStr,
diff --git a/crates/ra_ide/src/lib.rs b/crates/ra_ide/src/lib.rs
index 779a81b2c..06497617b 100644
--- a/crates/ra_ide/src/lib.rs
+++ b/crates/ra_ide/src/lib.rs
@@ -24,6 +24,7 @@ mod goto_definition;
 mod goto_type_definition;
 mod extend_selection;
 mod hover;
+mod call_hierarchy;
 mod call_info;
 mod syntax_highlighting;
 mod parent_module;
@@ -62,6 +63,7 @@ use crate::{db::LineIndexDatabase, display::ToNav, symbol_index::FileSymbol};
 
 pub use crate::{
     assists::{Assist, AssistId},
+    call_hierarchy::CallItem,
     change::{AnalysisChange, LibraryData},
     completion::{CompletionItem, CompletionItemKind, InsertTextFormat},
     diagnostics::Severity,
@@ -412,6 +414,24 @@ impl Analysis {
         self.with_db(|db| call_info::call_info(db, position))
     }
 
+    /// Computes call hierarchy candidates for the given file position.
+    pub fn call_hierarchy(
+        &self,
+        position: FilePosition,
+    ) -> Cancelable<Option<RangeInfo<Vec<NavigationTarget>>>> {
+        self.with_db(|db| call_hierarchy::call_hierarchy(db, position))
+    }
+
+    /// Computes incoming calls for the given file position.
+    pub fn incoming_calls(&self, position: FilePosition) -> Cancelable<Option<Vec<CallItem>>> {
+        self.with_db(|db| call_hierarchy::incoming_calls(db, position))
+    }
+
+    /// Computes incoming calls for the given file position.
+    pub fn outgoing_calls(&self, position: FilePosition) -> Cancelable<Option<Vec<CallItem>>> {
+        self.with_db(|db| call_hierarchy::outgoing_calls(db, position))
+    }
+
     /// Returns a `mod name;` declaration which created the current module.
     pub fn parent_module(&self, position: FilePosition) -> Cancelable<Vec<NavigationTarget>> {
         self.with_db(|db| parent_module::parent_module(db, position))
diff --git a/crates/ra_lsp_server/src/caps.rs b/crates/ra_lsp_server/src/caps.rs
index db502c200..c4711076c 100644
--- a/crates/ra_lsp_server/src/caps.rs
+++ b/crates/ra_lsp_server/src/caps.rs
@@ -1,8 +1,8 @@
 //! Advertizes the capabilities of the LSP Server.
 
 use lsp_types::{
-    CodeActionProviderCapability, CodeLensOptions, CompletionOptions,
-    DocumentOnTypeFormattingOptions, FoldingRangeProviderCapability,
+    CallHierarchyServerCapability, CodeActionProviderCapability, CodeLensOptions,
+    CompletionOptions, DocumentOnTypeFormattingOptions, FoldingRangeProviderCapability,
     ImplementationProviderCapability, RenameOptions, RenameProviderCapability, SaveOptions,
     SelectionRangeProviderCapability, ServerCapabilities, SignatureHelpOptions,
     TextDocumentSyncCapability, TextDocumentSyncKind, TextDocumentSyncOptions,
@@ -56,7 +56,7 @@ pub fn server_capabilities() -> ServerCapabilities {
         color_provider: None,
         execute_command_provider: None,
         workspace: None,
-        call_hierarchy_provider: None,
+        call_hierarchy_provider: Some(CallHierarchyServerCapability::Simple(true)),
         experimental: Default::default(),
     }
 }
diff --git a/crates/ra_lsp_server/src/conv.rs b/crates/ra_lsp_server/src/conv.rs
index e93d4ea33..c260b51c4 100644
--- a/crates/ra_lsp_server/src/conv.rs
+++ b/crates/ra_lsp_server/src/conv.rs
@@ -490,6 +490,24 @@ impl TryConvWith<&WorldSnapshot> for (FileId, RangeInfo<Vec<NavigationTarget>>)
     }
 }
 
+pub fn to_call_hierarchy_item(
+    file_id: FileId,
+    range: TextRange,
+    world: &WorldSnapshot,
+    line_index: &LineIndex,
+    nav: NavigationTarget,
+) -> Result<lsp_types::CallHierarchyItem> {
+    Ok(lsp_types::CallHierarchyItem {
+        name: nav.name().to_string(),
+        kind: nav.kind().conv(),
+        tags: None,
+        detail: nav.description().map(|it| it.to_string()),
+        uri: file_id.try_conv_with(&world)?,
+        range: nav.range().conv_with(&line_index),
+        selection_range: range.conv_with(&line_index),
+    })
+}
+
 pub fn to_location(
     file_id: FileId,
     range: TextRange,
diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index 4336583fe..047c86a3b 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -499,6 +499,9 @@ fn on_request(
         .on::<req::Formatting>(handlers::handle_formatting)?
         .on::<req::DocumentHighlightRequest>(handlers::handle_document_highlight)?
         .on::<req::InlayHints>(handlers::handle_inlay_hints)?
+        .on::<req::CallHierarchyPrepare>(handlers::handle_call_hierarchy_prepare)?
+        .on::<req::CallHierarchyIncomingCalls>(handlers::handle_call_hierarchy_incoming)?
+        .on::<req::CallHierarchyOutgoingCalls>(handlers::handle_call_hierarchy_outgoing)?
         .finish();
     Ok(())
 }
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index c8f52eb0e..a5b6f48af 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -5,13 +5,16 @@ use std::{fmt::Write as _, io::Write as _};
 
 use lsp_server::ErrorCode;
 use lsp_types::{
+    CallHierarchyIncomingCall, CallHierarchyIncomingCallsParams, CallHierarchyItem,
+    CallHierarchyOutgoingCall, CallHierarchyOutgoingCallsParams, CallHierarchyPrepareParams,
     CodeAction, CodeActionResponse, CodeLens, Command, CompletionItem, Diagnostic,
     DocumentFormattingParams, DocumentHighlight, DocumentSymbol, FoldingRange, FoldingRangeParams,
     Hover, HoverContents, Location, MarkupContent, MarkupKind, Position, PrepareRenameResponse,
     Range, RenameParams, SymbolInformation, TextDocumentIdentifier, TextEdit, WorkspaceEdit,
 };
 use ra_ide::{
-    AssistId, FileId, FilePosition, FileRange, Query, Runnable, RunnableKind, SearchScope,
+    AssistId, FileId, FilePosition, FileRange, Query, RangeInfo, Runnable, RunnableKind,
+    SearchScope,
 };
 use ra_prof::profile;
 use ra_syntax::{AstNode, SyntaxKind, TextRange, TextUnit};
@@ -21,7 +24,10 @@ use serde_json::to_value;
 
 use crate::{
     cargo_target_spec::{runnable_args, CargoTargetSpec},
-    conv::{to_location, Conv, ConvWith, FoldConvCtx, MapConvWith, TryConvWith, TryConvWithToVec},
+    conv::{
+        to_call_hierarchy_item, to_location, Conv, ConvWith, FoldConvCtx, MapConvWith, TryConvWith,
+        TryConvWithToVec,
+    },
     req::{self, Decoration, InlayHint, InlayHintsParams, InlayKind},
     world::WorldSnapshot,
     LspError, Result,
@@ -936,3 +942,91 @@ pub fn handle_inlay_hints(
         })
         .collect())
 }
+
+pub fn handle_call_hierarchy_prepare(
+    world: WorldSnapshot,
+    params: CallHierarchyPrepareParams,
+) -> Result<Option<Vec<CallHierarchyItem>>> {
+    let _p = profile("handle_call_hierarchy_prepare");
+    let position = params.text_document_position_params.try_conv_with(&world)?;
+    let file_id = position.file_id;
+
+    let nav_info = match world.analysis().call_hierarchy(position)? {
+        None => return Ok(None),
+        Some(it) => it,
+    };
+
+    let line_index = world.analysis().file_line_index(file_id)?;
+    let RangeInfo { range, info: navs } = nav_info;
+    let res = navs
+        .into_iter()
+        .filter(|it| it.kind() == SyntaxKind::FN_DEF)
+        .filter_map(|it| to_call_hierarchy_item(file_id, range, &world, &line_index, it).ok())
+        .collect();
+
+    Ok(Some(res))
+}
+
+pub fn handle_call_hierarchy_incoming(
+    world: WorldSnapshot,
+    params: CallHierarchyIncomingCallsParams,
+) -> Result<Option<Vec<CallHierarchyIncomingCall>>> {
+    let _p = profile("handle_call_hierarchy_incoming");
+    let item = params.item;
+
+    let doc = TextDocumentIdentifier::new(item.uri);
+    let frange: FileRange = (&doc, item.range).try_conv_with(&world)?;
+    let fpos = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
+
+    let call_items = match world.analysis().incoming_calls(fpos)? {
+        None => return Ok(None),
+        Some(it) => it,
+    };
+
+    let mut res = vec![];
+
+    for call_item in call_items.into_iter() {
+        let file_id = call_item.target.file_id();
+        let line_index = world.analysis().file_line_index(file_id)?;
+        let range = call_item.target.range();
+        let item = to_call_hierarchy_item(file_id, range, &world, &line_index, call_item.target)?;
+        res.push(CallHierarchyIncomingCall {
+            from: item,
+            from_ranges: call_item.ranges.iter().map(|it| it.conv_with(&line_index)).collect(),
+        });
+    }
+
+    Ok(Some(res))
+}
+
+pub fn handle_call_hierarchy_outgoing(
+    world: WorldSnapshot,
+    params: CallHierarchyOutgoingCallsParams,
+) -> Result<Option<Vec<CallHierarchyOutgoingCall>>> {
+    let _p = profile("handle_call_hierarchy_outgoing");
+    let item = params.item;
+
+    let doc = TextDocumentIdentifier::new(item.uri);
+    let frange: FileRange = (&doc, item.range).try_conv_with(&world)?;
+    let fpos = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
+
+    let call_items = match world.analysis().outgoing_calls(fpos)? {
+        None => return Ok(None),
+        Some(it) => it,
+    };
+
+    let mut res = vec![];
+
+    for call_item in call_items.into_iter() {
+        let file_id = call_item.target.file_id();
+        let line_index = world.analysis().file_line_index(file_id)?;
+        let range = call_item.target.range();
+        let item = to_call_hierarchy_item(file_id, range, &world, &line_index, call_item.target)?;
+        res.push(CallHierarchyOutgoingCall {
+            to: item,
+            from_ranges: call_item.ranges.iter().map(|it| it.conv_with(&line_index)).collect(),
+        });
+    }
+
+    Ok(Some(res))
+}
diff --git a/crates/ra_lsp_server/src/req.rs b/crates/ra_lsp_server/src/req.rs
index 40edaf677..8098ff31d 100644
--- a/crates/ra_lsp_server/src/req.rs
+++ b/crates/ra_lsp_server/src/req.rs
@@ -6,13 +6,15 @@ use serde::{Deserialize, Serialize};
 
 pub use lsp_types::{
     notification::*, request::*, ApplyWorkspaceEditParams, CodeActionParams, CodeLens,
-    CodeLensParams, CompletionParams, CompletionResponse, DidChangeConfigurationParams,
-    DidChangeWatchedFilesParams, DidChangeWatchedFilesRegistrationOptions,
-    DocumentOnTypeFormattingParams, DocumentSymbolParams, DocumentSymbolResponse,
-    FileSystemWatcher, Hover, InitializeResult, MessageType, ProgressParams, ProgressParamsValue,
-    ProgressToken, PublishDiagnosticsParams, ReferenceParams, Registration, RegistrationParams,
-    SelectionRange, SelectionRangeParams, ShowMessageParams, SignatureHelp, TextDocumentEdit,
-    TextDocumentPositionParams, TextEdit, WorkspaceEdit, WorkspaceSymbolParams,
+    CodeLensParams, CompletionParams, CompletionResponse, DiagnosticTag,
+    DidChangeConfigurationParams, DidChangeWatchedFilesParams,
+    DidChangeWatchedFilesRegistrationOptions, DocumentOnTypeFormattingParams, DocumentSymbolParams,
+    DocumentSymbolResponse, FileSystemWatcher, Hover, InitializeResult, MessageType,
+    PartialResultParams, ProgressParams, ProgressParamsValue, ProgressToken,
+    PublishDiagnosticsParams, ReferenceParams, Registration, RegistrationParams, SelectionRange,
+    SelectionRangeParams, ServerCapabilities, ShowMessageParams, SignatureHelp, SymbolKind,
+    TextDocumentEdit, TextDocumentPositionParams, TextEdit, WorkDoneProgressParams, WorkspaceEdit,
+    WorkspaceSymbolParams,
 };
 
 pub enum AnalyzerStatus {}