LSP: implement call hierarchy

Fixes: QTCREATORBUG-11660
Change-Id: I006872ba598a807f1f9f16d134fe9ce4fe5dd09d
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

14 files changed, 494 insertions, 2 deletions

diff --git a/src/libs/languageserverprotocol/CMakeLists.txt b/src/libs/languageserverprotocol/CMakeLists.txt
index d4c2d635d2..a3031413a4 100644
--- a/src/libs/languageserverprotocol/CMakeLists.txt
+++ b/src/libs/languageserverprotocol/CMakeLists.txt
@@ -2,6 +2,7 @@ add_qtc_library(LanguageServerProtocol
   DEPENDS Utils
   SOURCES
     basemessage.cpp basemessage.h
+    callhierarchy.cpp callhierarchy.h
     client.cpp client.h
     clientcapabilities.cpp clientcapabilities.h
     completion.cpp completion.h
diff --git a/src/libs/languageserverprotocol/callhierarchy.cpp b/src/libs/languageserverprotocol/callhierarchy.cpp
new file mode 100644
index 0000000000..fc61faf664
--- /dev/null
+++ b/src/libs/languageserverprotocol/callhierarchy.cpp
@@ -0,0 +1,28 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include "callhierarchy.h"
+
+namespace LanguageServerProtocol {
+
+bool CallHierarchyItem::isValid() const
+{
+    return contains(nameKey) && contains(symbolKindKey) && contains(rangeKey) && contains(uriKey)
+           && contains(selectionRangeKey);
+}
+
+PrepareCallHierarchyRequest::PrepareCallHierarchyRequest(const TextDocumentPositionParams &params)
+    : Request(methodName, params)
+{}
+
+CallHierarchyIncomingCallsRequest::CallHierarchyIncomingCallsRequest(
+    const CallHierarchyCallsParams &params)
+    : Request(methodName, params)
+{}
+
+CallHierarchyOutgoingCallsRequest::CallHierarchyOutgoingCallsRequest(
+    const CallHierarchyCallsParams &params)
+    : Request(methodName, params)
+{}
+
+} // namespace LanguageServerProtocol
diff --git a/src/libs/languageserverprotocol/callhierarchy.h b/src/libs/languageserverprotocol/callhierarchy.h
new file mode 100644
index 0000000000..a284611a12
--- /dev/null
+++ b/src/libs/languageserverprotocol/callhierarchy.h
@@ -0,0 +1,108 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "jsonrpcmessages.h"
+
+namespace LanguageServerProtocol {
+
+class LANGUAGESERVERPROTOCOL_EXPORT CallHierarchyItem : public JsonObject
+{
+public:
+    using JsonObject::JsonObject;
+
+    QString name() const { return typedValue<QString>(nameKey); }
+    void setName(const QString &name) { insert(nameKey, name); }
+
+    SymbolKind symbolKind() const { return SymbolKind(typedValue<int>(symbolKindKey)); }
+    void setSymbolKind(const SymbolKind &symbolKind) { insert(symbolKindKey, int(symbolKind)); }
+
+    Range range() const { return typedValue<Range>(rangeKey); }
+    void setRange(const Range &range) { insert(rangeKey, range); }
+
+    DocumentUri uri() const { return DocumentUri::fromProtocol(typedValue<QString>(uriKey)); }
+    void setUri(const DocumentUri &uri) { insert(uriKey, uri); }
+
+    Range selectionRange() const { return typedValue<Range>(selectionRangeKey); }
+    void setSelectionRange(Range selectionRange) { insert(selectionRangeKey, selectionRange); }
+
+    std::optional<QString> detail() const { return optionalValue<QString>(detailKey); }
+    void setDetail(const QString &detail) { insert(detailKey, detail); }
+    void clearDetail() { remove(detailKey); }
+
+    std::optional<QList<DocumentSymbol>> children() const
+    { return optionalArray<DocumentSymbol>(childrenKey); }
+    void setChildren(const QList<DocumentSymbol> &children) { insertArray(childrenKey, children); }
+    void clearChildren() { remove(childrenKey); }
+
+    bool isValid() const override;
+};
+
+class LANGUAGESERVERPROTOCOL_EXPORT PrepareCallHierarchyRequest : public Request<
+        LanguageClientArray<CallHierarchyItem>, std::nullptr_t, TextDocumentPositionParams>
+{
+public:
+    explicit PrepareCallHierarchyRequest(const TextDocumentPositionParams &params);
+    using Request::Request;
+    constexpr static const char methodName[] = "textDocument/prepareCallHierarchy";
+};
+
+class LANGUAGESERVERPROTOCOL_EXPORT CallHierarchyCallsParams : public JsonObject
+{
+public:
+    using JsonObject::JsonObject;
+
+    CallHierarchyItem item() const { return typedValue<CallHierarchyItem>(itemKey); }
+    void setItem(const CallHierarchyItem &item) { insert(itemKey, item); }
+
+    bool isValid() const override { return contains(itemKey); }
+};
+
+class LANGUAGESERVERPROTOCOL_EXPORT CallHierarchyIncomingCall : public JsonObject
+{
+public:
+    using JsonObject::JsonObject;
+
+    CallHierarchyItem from() const { return typedValue<CallHierarchyItem>(fromKey); }
+    void setFrom(const CallHierarchyItem &from) { insert(fromKey, from); }
+
+    QList<Range> fromRanges() const { return array<Range>(fromRangesKey); }
+    void setFromRanges(const QList<Range> &fromRanges) { insertArray(fromRangesKey, fromRanges); }
+
+    bool isValid() const override { return contains(fromRangesKey) && contains(fromRangesKey); }
+};
+
+class LANGUAGESERVERPROTOCOL_EXPORT CallHierarchyIncomingCallsRequest : public Request<
+        LanguageClientArray<CallHierarchyIncomingCall>, std::nullptr_t, CallHierarchyCallsParams>
+{
+public:
+    explicit CallHierarchyIncomingCallsRequest(const CallHierarchyCallsParams &params);
+    using Request::Request;
+    constexpr static const char methodName[] = "callHierarchy/incomingCalls";
+};
+
+class LANGUAGESERVERPROTOCOL_EXPORT CallHierarchyOutgoingCall : public JsonObject
+{
+public:
+    using JsonObject::JsonObject;
+
+    CallHierarchyItem to() const { return typedValue<CallHierarchyItem>(toKey); }
+    void setTo(const CallHierarchyItem &to) { insert(toKey, to); }
+
+    QList<Range> fromRanges() const { return array<Range>(fromRangesKey); }
+    void setFromRanges(const QList<Range> &fromRanges) { insertArray(fromRangesKey, fromRanges); }
+
+    bool isValid() const override { return contains(fromRangesKey) && contains(fromRangesKey); }
+};
+
+class LANGUAGESERVERPROTOCOL_EXPORT CallHierarchyOutgoingCallsRequest : public Request<
+        LanguageClientArray<CallHierarchyOutgoingCall>, std::nullptr_t, CallHierarchyCallsParams>
+{
+public:
+    explicit CallHierarchyOutgoingCallsRequest(const CallHierarchyCallsParams &params);
+    using Request::Request;
+    constexpr static const char methodName[] = "callHierarchy/outgoingCalls";
+};
+
+} // namespace LanguageServerProtocol
diff --git a/src/libs/languageserverprotocol/clientcapabilities.h b/src/libs/languageserverprotocol/clientcapabilities.h
index a9df171b49..92f78ae056 100644
--- a/src/libs/languageserverprotocol/clientcapabilities.h
+++ b/src/libs/languageserverprotocol/clientcapabilities.h
@@ -504,6 +504,12 @@ public:
     std::optional<SemanticTokensClientCapabilities> semanticTokens() const;
     void setSemanticTokens(const SemanticTokensClientCapabilities &semanticTokens);
     void clearSemanticTokens() { remove(semanticTokensKey); }
+
+    std::optional<DynamicRegistrationCapabilities> callHierarchy() const
+    { return optionalValue<DynamicRegistrationCapabilities>(callHierarchyKey); }
+    void setCallHierarchy(const DynamicRegistrationCapabilities &callHierarchy)
+    { insert(callHierarchyKey, callHierarchy); }
+    void clearCallHierarchy() { remove(callHierarchyKey); }
 };
 
 class LANGUAGESERVERPROTOCOL_EXPORT SemanticTokensWorkspaceClientCapabilities : public JsonObject
diff --git a/src/libs/languageserverprotocol/jsonkeys.h b/src/libs/languageserverprotocol/jsonkeys.h
index 2dbbecb1ef..302c57bc20 100644
--- a/src/libs/languageserverprotocol/jsonkeys.h
+++ b/src/libs/languageserverprotocol/jsonkeys.h
@@ -16,6 +16,8 @@ constexpr char16_t appliedKey[] = u"applied";
 constexpr char16_t applyEditKey[] = u"applyEdit";
 constexpr char16_t argumentsKey[] = u"arguments";
 constexpr char16_t blueKey[] = u"blue";
+constexpr char16_t callHierarchyKey[] = u"callHierarchy";
+constexpr char16_t callHierarchyProviderKey[] = u"callHierarchyProvider";
 constexpr char16_t cancellableKey[] = u"cancellable";
 constexpr char16_t capabilitiesKey[] = u"capabilities";
 constexpr char16_t chKey[] = u"ch";
@@ -88,6 +90,8 @@ constexpr char16_t filterTextKey[] = u"filterText";
 constexpr char16_t firstTriggerCharacterKey[] = u"firstTriggerCharacter";
 constexpr char16_t formatsKey[] = u"formats";
 constexpr char16_t formattingKey[] = u"formatting";
+constexpr char16_t fromKey[] = u"from";
+constexpr char16_t fromRangesKey[] = u"fromRanges";
 constexpr char16_t fullKey[] = u"full";
 constexpr char16_t greenKey[] = u"green";
 constexpr char16_t hierarchicalDocumentSymbolSupportKey[] = u"hierarchicalDocumentSymbolSupport";
@@ -104,6 +108,7 @@ constexpr char16_t insertSpaceKey[] = u"insertSpace";
 constexpr char16_t insertTextFormatKey[] = u"insertTextFormat";
 constexpr char16_t insertTextKey[] = u"insertText";
 constexpr char16_t isIncompleteKey[] = u"isIncomplete";
+constexpr char16_t itemKey[] = u"item";
 constexpr char16_t itemsKey[] = u"items";
 constexpr char16_t jsonRpcVersionKey[] = u"jsonrpc";
 constexpr char16_t kindKey[] = u"kind";
@@ -190,6 +195,7 @@ constexpr char16_t textEditKey[] = u"textEdit";
 constexpr char16_t textKey[] = u"text";
 constexpr char16_t titleKey[] = u"title";
 constexpr char16_t tokenKey[] = u"token";
+constexpr char16_t toKey[] = u"to";
 constexpr char16_t tokenModifiersKey[] = u"tokenModifiers";
 constexpr char16_t tokenTypesKey[] = u"tokenTypes";
 constexpr char16_t traceKey[] = u"trace";
diff --git a/src/libs/languageserverprotocol/languageserverprotocol.qbs b/src/libs/languageserverprotocol/languageserverprotocol.qbs
index cf243929ce..163b2d6d4e 100644
--- a/src/libs/languageserverprotocol/languageserverprotocol.qbs
+++ b/src/libs/languageserverprotocol/languageserverprotocol.qbs
@@ -10,6 +10,8 @@ Project {
         files: [
             "basemessage.cpp",
             "basemessage.h",
+            "callhierarchy.cpp",
+            "callhierarchy.h",
             "client.cpp",
             "client.h",
             "clientcapabilities.cpp",
diff --git a/src/libs/languageserverprotocol/servercapabilities.cpp b/src/libs/languageserverprotocol/servercapabilities.cpp
index d87403781d..1c0d322e6e 100644
--- a/src/libs/languageserverprotocol/servercapabilities.cpp
+++ b/src/libs/languageserverprotocol/servercapabilities.cpp
@@ -156,6 +156,28 @@ void ServerCapabilities::setSemanticTokensProvider(
     insert(semanticTokensProviderKey, semanticTokensProvider);
 }
 
+std::optional<std::variant<bool, WorkDoneProgressOptions> >
+ServerCapabilities::callHierarchyProvider() const
+{
+    const QJsonValue &provider = value(callHierarchyProviderKey);
+    if (provider.isBool())
+        return provider.toBool();
+    else if (provider.isObject())
+        return WorkDoneProgressOptions(provider.toObject());
+    return std::nullopt;
+}
+
+void ServerCapabilities::setCallHierarchyProvider(
+    const std::variant<bool, WorkDoneProgressOptions> &callHierarchyProvider)
+{
+    QJsonValue val;
+    if (std::holds_alternative<bool>(callHierarchyProvider))
+        val = std::get<bool>(callHierarchyProvider);
+    else if (std::holds_alternative<WorkDoneProgressOptions>(callHierarchyProvider))
+        val = QJsonObject(std::get<WorkDoneProgressOptions>(callHierarchyProvider));
+    insert(callHierarchyProviderKey, val);
+}
+
 std::optional<std::variant<bool, WorkDoneProgressOptions>>
 ServerCapabilities::workspaceSymbolProvider() const
 {
diff --git a/src/libs/languageserverprotocol/servercapabilities.h b/src/libs/languageserverprotocol/servercapabilities.h
index a25c542578..bacddda19e 100644
--- a/src/libs/languageserverprotocol/servercapabilities.h
+++ b/src/libs/languageserverprotocol/servercapabilities.h
@@ -328,6 +328,10 @@ public:
     void setSemanticTokensProvider(const SemanticTokensOptions &semanticTokensProvider);
     void clearSemanticTokensProvider() { remove(semanticTokensProviderKey); }
 
+    std::optional<std::variant<bool, WorkDoneProgressOptions>> callHierarchyProvider() const;
+    void setCallHierarchyProvider(const std::variant<bool, WorkDoneProgressOptions> &callHierarchyProvider);
+    void clearCallHierarchyProvider() { remove(callHierarchyProviderKey); }
+
     // The server provides workspace symbol support.
     std::optional<std::variant<bool, WorkDoneProgressOptions>> workspaceSymbolProvider() const;
     void setWorkspaceSymbolProvider(std::variant<bool, WorkDoneProgressOptions> workspaceSymbolProvider);
diff --git a/src/plugins/languageclient/CMakeLists.txt b/src/plugins/languageclient/CMakeLists.txt
index 42dde24dba..8e1748a04a 100644
--- a/src/plugins/languageclient/CMakeLists.txt
+++ b/src/plugins/languageclient/CMakeLists.txt
@@ -2,6 +2,7 @@ add_qtc_plugin(LanguageClient
   PUBLIC_DEPENDS LanguageServerProtocol Qt::Core app_version
   PLUGIN_DEPENDS ProjectExplorer Core TextEditor
   SOURCES
+    callhierarchy.cpp callhierarchy.h
     client.cpp client.h
     diagnosticmanager.cpp diagnosticmanager.h
     documentsymbolcache.cpp documentsymbolcache.h
diff --git a/src/plugins/languageclient/callhierarchy.cpp b/src/plugins/languageclient/callhierarchy.cpp
new file mode 100644
index 0000000000..098a1a4b64
--- /dev/null
+++ b/src/plugins/languageclient/callhierarchy.cpp
@@ -0,0 +1,291 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include "callhierarchy.h"
+
+#include "languageclientmanager.h"
+#include "languageclienttr.h"
+
+#include <QToolButton>
+#include <coreplugin/editormanager/editormanager.h>
+#include <languageserverprotocol/callhierarchy.h>
+#include <texteditor/texteditor.h>
+#include <utils/delegates.h>
+#include <utils/navigationtreeview.h>
+#include <utils/treemodel.h>
+#include <utils/utilsicons.h>
+
+using namespace Utils;
+using namespace TextEditor;
+using namespace LanguageServerProtocol;
+
+namespace LanguageClient {
+
+const char CALL_HIERARCHY_FACTORY_ID[] = "LanguageClient.CallHierarchy";
+
+namespace {
+enum Direction { Incoming, Outgoing };
+
+enum {
+    AnnotationRole = Qt::UserRole + 1,
+    LinkRole
+};
+}
+
+class CallHierarchyItem : public TreeItem
+{
+public:
+    CallHierarchyItem(const LanguageServerProtocol::CallHierarchyItem &item,
+                      const Direction direction,
+                      Client *client)
+        : m_item(item)
+        , m_direction(direction)
+        , m_client(client)
+    {
+    }
+
+    QVariant data(int column, int role) const override
+    {
+        switch (role) {
+        case Qt::DecorationRole:
+            return symbolIcon(int(m_item.symbolKind()));
+        case Qt::DisplayRole:
+            return m_item.name();
+        case LinkRole: {
+            if (!m_client)
+                return QVariant();
+            const Position start = m_item.selectionRange().start();
+            return QVariant::fromValue(
+                Link(m_client->serverUriToHostPath(m_item.uri()), start.line(), start.character()));
+        }
+        case AnnotationRole:
+            if (const std::optional<QString> detail = m_item.detail())
+                return *detail;
+            return {};
+        default:
+            return TreeItem::data(column, role);
+        }
+    }
+    bool canFetchMore() const override
+    {
+        return m_client && !m_fetchedChildren;
+    }
+
+    void fetchMore() override
+    {
+        m_fetchedChildren = true;
+        if (!m_client)
+            return;
+
+        CallHierarchyCallsParams params;
+        params.setItem(m_item);
+
+        if (m_direction == Incoming) {
+            CallHierarchyIncomingCallsRequest request(params);
+            request.setResponseCallback(
+                        [this](const CallHierarchyIncomingCallsRequest::Response &response) {
+                const std::optional<LanguageClientArray<CallHierarchyIncomingCall>> result
+                        = response.result();
+                if (result && !result->isNull()) {
+                    for (const CallHierarchyIncomingCall &item : result->toList()) {
+                        if (item.isValid())
+                            appendChild(new CallHierarchyItem(item.from(), m_direction, m_client));
+                    }
+                }
+                if (!hasChildren())
+                    update();
+            });
+            m_client->sendMessage(request);
+        } else {
+            CallHierarchyOutgoingCallsRequest request(params);
+            request.setResponseCallback(
+                        [this](const CallHierarchyOutgoingCallsRequest::Response &response) {
+                const std::optional<LanguageClientArray<CallHierarchyOutgoingCall>> result
+                        = response.result();
+                if (result && !result->isNull()) {
+                    for (const CallHierarchyOutgoingCall &item : result->toList()) {
+                        if (item.isValid())
+                            appendChild(new CallHierarchyItem(item.to(), m_direction, m_client));
+                    }
+                }
+                if (!hasChildren())
+                    update();
+                });
+            m_client->sendMessage(request);
+        }
+    }
+
+protected:
+    const LanguageServerProtocol::CallHierarchyItem m_item;
+    const Direction m_direction;
+    bool m_fetchedChildren = false;
+    QPointer<Client> m_client;
+};
+
+class CallHierarchyDirectionItem : public CallHierarchyItem
+{
+public:
+    CallHierarchyDirectionItem(const LanguageServerProtocol::CallHierarchyItem &item,
+                               const Direction direction,
+                               Client *client)
+        : CallHierarchyItem(item, direction, client)
+    {}
+
+    QVariant data(int column, int role) const override
+    {
+        if (role == Qt::DisplayRole)
+            return m_direction == Incoming ? Tr::tr("Incoming") : Tr::tr("Outgoing");
+        return CallHierarchyItem::data(column, role);
+    }
+};
+
+
+class CallHierarchyRootItem : public TreeItem
+{
+public:
+    CallHierarchyRootItem(const LanguageServerProtocol::CallHierarchyItem &item, Client *client)
+        : m_item(item)
+    {
+        appendChild(new CallHierarchyDirectionItem(m_item, Incoming, client));
+        appendChild(new CallHierarchyDirectionItem(m_item, Outgoing, client));
+    }
+
+    QVariant data(int column, int role) const override
+    {
+        switch (role) {
+        case Qt::DecorationRole:
+            return symbolIcon(int(m_item.symbolKind()));
+        case Qt::DisplayRole:
+            return m_item.name();
+        default:
+            return TreeItem::data(column, role);
+        }
+    }
+
+private:
+    const LanguageServerProtocol::CallHierarchyItem m_item;
+};
+
+class CallHierarchy : public QWidget
+{
+public:
+    CallHierarchy() : m_view(new NavigationTreeView(this))
+    {
+        m_delegate.setDelimiter(" ");
+        m_delegate.setAnnotationRole(AnnotationRole);
+
+        m_view->setModel(&m_model);
+        m_view->setActivationMode(SingleClickActivation);
+        m_view->setItemDelegate(&m_delegate);
+
+        setLayout(new QVBoxLayout);
+        layout()->addWidget(m_view);
+        layout()->setContentsMargins(0, 0, 0, 0);
+        layout()->setSpacing(0);
+
+        connect(m_view, &NavigationTreeView::activated, this, &CallHierarchy::onItemActivated);
+    }
+
+    void onItemActivated(const QModelIndex &index)
+    {
+        const auto link = index.data(LinkRole).value<Utils::Link>();
+        if (link.hasValidTarget())
+            Core::EditorManager::openEditorAt(link);
+    }
+
+    void updateHierarchyAtCursorPosition();
+    void handlePrepareResponse(Client *client,
+                               const PrepareCallHierarchyRequest::Response &response);
+
+    AnnotatedItemDelegate m_delegate;
+    NavigationTreeView *m_view;
+    TreeModel<TreeItem, CallHierarchyRootItem, CallHierarchyDirectionItem, CallHierarchyItem> m_model;
+};
+
+void CallHierarchy::updateHierarchyAtCursorPosition()
+{
+    m_model.clear();
+
+    BaseTextEditor *editor = BaseTextEditor::currentTextEditor();
+    if (!editor)
+        return;
+    Client *client = LanguageClientManager::clientForFilePath(editor->document()->filePath());
+    if (!client)
+        return;
+
+    const QString methodName = PrepareCallHierarchyRequest::methodName;
+    std::optional<bool> registered = client->dynamicCapabilities().isRegistered(methodName);
+    bool supported = registered.value_or(false);
+    const Core::IDocument *document = editor->document();
+    if (registered) {
+        if (supported) {
+            const QJsonValue &options = client->dynamicCapabilities().option(methodName);
+            const TextDocumentRegistrationOptions docOptions(options);
+            supported = docOptions.filterApplies(document->filePath(),
+                                                 Utils::mimeTypeForName(document->mimeType()));
+        }
+    } else {
+        supported = client->capabilities().callHierarchyProvider().has_value();
+    }
+
+    if (!supported)
+        return;
+
+    TextDocumentPositionParams params;
+    params.setTextDocument(TextDocumentIdentifier(client->hostPathToServerUri(document->filePath())));
+    params.setPosition(Position(editor->editorWidget()->textCursor()));
+
+    PrepareCallHierarchyRequest request(params);
+    request.setResponseCallback([this, client = QPointer<Client>(client)](
+                                    const PrepareCallHierarchyRequest::Response &response) {
+        handlePrepareResponse(client, response);
+    });
+
+    client->sendMessage(request);
+}
+
+void CallHierarchy::handlePrepareResponse(Client *client,
+                                          const PrepareCallHierarchyRequest::Response &response)
+{
+    if (!client)
+        return;
+    const std::optional<PrepareCallHierarchyRequest::Response::Error> error = response.error();
+    if (error)
+        client->log(*error);
+
+    const std::optional<LanguageClientArray<LanguageServerProtocol::CallHierarchyItem>>
+        result = response.result();
+    if (result && !result->isNull()) {
+        for (const LanguageServerProtocol::CallHierarchyItem &item : result->toList()) {
+            auto newItem = new CallHierarchyRootItem(item, client);
+            m_model.rootItem()->appendChild(newItem);
+            m_view->expand(newItem->index());
+            newItem->forChildrenAtLevel(1, [&](const TreeItem *child) {
+                m_view->expand(child->index());
+            });
+        }
+    }
+}
+
+CallHierarchyFactory::CallHierarchyFactory()
+{
+    setDisplayName(tr("Call Hierarchy"));
+    setPriority(650);
+    setId(CALL_HIERARCHY_FACTORY_ID);
+}
+
+Core::NavigationView CallHierarchyFactory::createWidget()
+{
+    auto h = new CallHierarchy;
+    h->updateHierarchyAtCursorPosition();
+
+    Icons::RELOAD_TOOLBAR.icon();
+    auto button = new QToolButton;
+    button->setIcon(Icons::RELOAD_TOOLBAR.icon());
+    connect(button, &QToolButton::clicked, [h](){
+        h->updateHierarchyAtCursorPosition();
+    });
+    return {h,{button}};
+}
+
+} // namespace LanguageClient
diff --git a/src/plugins/languageclient/callhierarchy.h b/src/plugins/languageclient/callhierarchy.h
new file mode 100644
index 0000000000..f707c4fbcb
--- /dev/null
+++ b/src/plugins/languageclient/callhierarchy.h
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include <coreplugin/inavigationwidgetfactory.h>
+
+#pragma once
+
+namespace LanguageClient {
+
+class CallHierarchyFactory : public Core::INavigationWidgetFactory
+{
+    Q_OBJECT
+
+public:
+    CallHierarchyFactory();
+
+    Core::NavigationView createWidget()  override;
+};
+
+} // namespace LanguageClient
diff --git a/src/plugins/languageclient/client.cpp b/src/plugins/languageclient/client.cpp
index 466fbd1d43..dc391575e8 100644
--- a/src/plugins/languageclient/client.cpp
+++ b/src/plugins/languageclient/client.cpp
@@ -482,6 +482,7 @@ static ClientCapabilities generateClientCapabilities()
     tokens.setTokenModifiers({"declaration", "definition"});
     tokens.setFormats({"relative"});
     documentCapabilities.setSemanticTokens(tokens);
+    documentCapabilities.setCallHierarchy(allowDynamicRegistration);
     capabilities.setTextDocument(documentCapabilities);
 
     WindowClientClientCapabilities window;
diff --git a/src/plugins/languageclient/languageclient.qbs b/src/plugins/languageclient/languageclient.qbs
index 3e28480e6d..9a48caf9e3 100644
--- a/src/plugins/languageclient/languageclient.qbs
+++ b/src/plugins/languageclient/languageclient.qbs
@@ -20,6 +20,8 @@ QtcPlugin {
     Depends { name: "app_version_header" }
 
     files: [
+        "callhierarchy.cpp",
+        "callhierarchy.h",
         "client.cpp",
         "client.h",
         "diagnosticmanager.cpp",
diff --git a/src/plugins/languageclient/languageclientplugin.h b/src/plugins/languageclient/languageclientplugin.h
index 59179e88ee..5bdbfc0a0a 100644
--- a/src/plugins/languageclient/languageclientplugin.h
+++ b/src/plugins/languageclient/languageclientplugin.h
@@ -3,9 +3,8 @@
 
 #pragma once
 
-#include "languageclientmanager.h"
 #include "languageclientoutline.h"
-#include "languageclientsettings.h"
+#include "callhierarchy.h"
 
 #include <extensionsystem/iplugin.h>
 
@@ -29,6 +28,7 @@ private:
 
 private:
     LanguageClientOutlineWidgetFactory m_outlineFactory;
+    CallHierarchyFactory m_callHierarchyFactory;
 
 #ifdef WITH_TESTS
 private slots: