diff --git a/CMakeLists.txt b/CMakeLists.txt
index b794d398..fa116816 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,7 +196,6 @@ target_sources(ccls PRIVATE
   src/platform_win.cc
   src/position.cc
   src/project.cc
-  src/query_utils.cc
   src/query.cc
   src/serializer.cc
   src/test.cc
diff --git a/src/message_handler.cc b/src/message_handler.cc
index 4c093f4a..19db4abe 100644
--- a/src/message_handler.cc
+++ b/src/message_handler.cc
@@ -6,7 +6,7 @@
 #include "log.hh"
 #include "pipeline.hh"
 #include "project.hh"
-#include "query_utils.hh"
+#include "query.hh"
 #include "serializers/json.hh"
 
 #include <algorithm>
diff --git a/src/messages/ccls_call.cc b/src/messages/ccls_call.cc
index 84341457..32078759 100644
--- a/src/messages/ccls_call.cc
+++ b/src/messages/ccls_call.cc
@@ -4,7 +4,7 @@
 #include "hierarchy.hh"
 #include "message_handler.hh"
 #include "pipeline.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <unordered_set>
 
diff --git a/src/messages/ccls_info.cc b/src/messages/ccls_info.cc
index 119acd57..e1a5f1f6 100644
--- a/src/messages/ccls_info.cc
+++ b/src/messages/ccls_info.cc
@@ -4,7 +4,7 @@
 #include "message_handler.hh"
 #include "pipeline.hh"
 #include "project.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 namespace ccls {
 MAKE_REFLECT_STRUCT(QueryFile::Def, path, args, language, skipped_ranges,
diff --git a/src/messages/ccls_inheritance.cc b/src/messages/ccls_inheritance.cc
index 35f9a640..b806fede 100644
--- a/src/messages/ccls_inheritance.cc
+++ b/src/messages/ccls_inheritance.cc
@@ -4,7 +4,7 @@
 #include "hierarchy.hh"
 #include "message_handler.hh"
 #include "pipeline.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <unordered_set>
 
diff --git a/src/messages/ccls_member.cc b/src/messages/ccls_member.cc
index f14e4b89..6fd80529 100644
--- a/src/messages/ccls_member.cc
+++ b/src/messages/ccls_member.cc
@@ -5,7 +5,7 @@
 #include "hierarchy.hh"
 #include "message_handler.hh"
 #include "pipeline.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <clang/AST/Type.h>
 #include <llvm/ADT/DenseSet.h>
diff --git a/src/messages/ccls_navigate.cc b/src/messages/ccls_navigate.cc
index 3c541328..dad671a5 100644
--- a/src/messages/ccls_navigate.cc
+++ b/src/messages/ccls_navigate.cc
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "message_handler.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 namespace ccls {
 namespace {
diff --git a/src/messages/ccls_vars.cc b/src/messages/ccls_vars.cc
index 52c41ebe..51537768 100644
--- a/src/messages/ccls_vars.cc
+++ b/src/messages/ccls_vars.cc
@@ -3,7 +3,7 @@
 
 #include "message_handler.hh"
 #include "pipeline.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 namespace ccls {
 namespace {
diff --git a/src/messages/textDocument_code.cc b/src/messages/textDocument_code.cc
index 3d455abf..17395b75 100644
--- a/src/messages/textDocument_code.cc
+++ b/src/messages/textDocument_code.cc
@@ -3,7 +3,7 @@
 
 #include "message_handler.hh"
 #include "pipeline.hh"
-#include "query_utils.hh"
+#include "query.hh"
 #include "serializers/json.hh"
 
 #include <llvm/Support/FormatVariadic.h>
diff --git a/src/messages/textDocument_definition.cc b/src/messages/textDocument_definition.cc
index b2913fdc..c1e3f806 100644
--- a/src/messages/textDocument_definition.cc
+++ b/src/messages/textDocument_definition.cc
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "message_handler.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <ctype.h>
 #include <limits.h>
diff --git a/src/messages/textDocument_document.cc b/src/messages/textDocument_document.cc
index 39cc69dd..eaddd7ca 100644
--- a/src/messages/textDocument_document.cc
+++ b/src/messages/textDocument_document.cc
@@ -3,7 +3,7 @@
 
 #include "message_handler.hh"
 #include "pipeline.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <algorithm>
 
diff --git a/src/messages/textDocument_foldingRange.cc b/src/messages/textDocument_foldingRange.cc
index a8a19596..da3f5247 100644
--- a/src/messages/textDocument_foldingRange.cc
+++ b/src/messages/textDocument_foldingRange.cc
@@ -4,7 +4,7 @@
 #include "message_handler.hh"
 #include "pipeline.hh"
 #include "project.hh"
-#include "query_utils.hh"
+#include "query.hh"
 #include "working_files.hh"
 
 namespace ccls {
diff --git a/src/messages/textDocument_hover.cc b/src/messages/textDocument_hover.cc
index d21ec458..f0a71f1c 100644
--- a/src/messages/textDocument_hover.cc
+++ b/src/messages/textDocument_hover.cc
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "message_handler.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 namespace ccls {
 namespace {
diff --git a/src/messages/textDocument_references.cc b/src/messages/textDocument_references.cc
index ed66379c..410554dd 100644
--- a/src/messages/textDocument_references.cc
+++ b/src/messages/textDocument_references.cc
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "message_handler.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <unordered_set>
 
diff --git a/src/messages/textDocument_rename.cc b/src/messages/textDocument_rename.cc
index 02f326c5..18abde67 100644
--- a/src/messages/textDocument_rename.cc
+++ b/src/messages/textDocument_rename.cc
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "message_handler.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 namespace ccls {
 namespace {
diff --git a/src/messages/workspace.cc b/src/messages/workspace.cc
index 4ac5b8bd..3f14ed89 100644
--- a/src/messages/workspace.cc
+++ b/src/messages/workspace.cc
@@ -7,7 +7,7 @@
 #include "message_handler.hh"
 #include "pipeline.hh"
 #include "project.hh"
-#include "query_utils.hh"
+#include "query.hh"
 
 #include <llvm/ADT/STLExtras.h>
 #include <llvm/ADT/StringRef.h>
diff --git a/src/pipeline.cc b/src/pipeline.cc
index 0aeaa8d6..805e8c2e 100644
--- a/src/pipeline.cc
+++ b/src/pipeline.cc
@@ -12,7 +12,7 @@
 #include "pipeline.hh"
 #include "platform.hh"
 #include "project.hh"
-#include "query_utils.hh"
+#include "query.hh"
 #include "serializers/json.hh"
 
 #include <rapidjson/document.h>
diff --git a/src/query.cc b/src/query.cc
index 248a61cc..d015229a 100644
--- a/src/query.cc
+++ b/src/query.cc
@@ -4,11 +4,13 @@
 #include "query.hh"
 
 #include "indexer.hh"
+#include "pipeline.hh"
 #include "serializer.hh"
 #include "serializers/json.hh"
 
-#include <cassert>
-#include <cstdint>
+#include <assert.h>
+#include <stdint.h>
+#include <limits.h>
 #include <functional>
 #include <optional>
 #include <string>
@@ -40,7 +42,7 @@ void RemoveRange(std::vector<T> &from, const std::vector<T> &to_remove) {
   }
 }
 
-QueryFile::DefUpdate BuildFileDefUpdate(const IndexFile &indexed) {
+QueryFile::DefUpdate BuildFileDefUpdate(IndexFile &&indexed) {
   QueryFile::Def def;
   def.path = std::move(indexed.path);
   def.args = std::move(indexed.args);
@@ -75,7 +77,6 @@ IndexUpdate IndexUpdate::CreateDelta(IndexFile *previous, IndexFile *current) {
   else
     previous = &empty;
   r.lid2path = std::move(current->lid2path);
-  r.files_def_update = BuildFileDefUpdate(std::move(*current));
 
   r.funcs_hint = int(current->usr2func.size() - previous->usr2func.size());
   for (auto &it : previous->usr2func) {
@@ -131,6 +132,7 @@ IndexUpdate IndexUpdate::CreateDelta(IndexFile *previous, IndexFile *current) {
     r.vars_uses[var.usr].second = std::move(var.uses);
   }
 
+  r.files_def_update = BuildFileDefUpdate(std::move(*current));
   return r;
 }
 
@@ -474,4 +476,316 @@ std::vector<uint8_t> DB::GetFileSet(const std::vector<std::string> &folders) {
     }
   return file_set;
 }
+
+namespace {
+// Computes roughly how long |range| is.
+int ComputeRangeSize(const Range &range) {
+  if (range.start.line != range.end.line)
+    return INT_MAX;
+  return range.end.column - range.start.column;
+}
+
+template <typename Q>
+std::vector<Use>
+GetDeclarations(llvm::DenseMap<Usr, int, DenseMapInfoForUsr> &entity_usr,
+                std::vector<Q> &entities, const std::vector<Usr> &usrs) {
+  std::vector<Use> ret;
+  ret.reserve(usrs.size());
+  for (Usr usr : usrs) {
+    Q &entity = entities[entity_usr[{usr}]];
+    bool has_def = false;
+    for (auto &def : entity.def)
+      if (def.spell) {
+        ret.push_back(*def.spell);
+        has_def = true;
+        break;
+      }
+    if (!has_def && entity.declarations.size())
+      ret.push_back(entity.declarations[0]);
+  }
+  return ret;
+}
+}
+
+Maybe<DeclRef> GetDefinitionSpell(DB *db, SymbolIdx sym) {
+  Maybe<DeclRef> ret;
+  EachEntityDef(db, sym, [&](const auto &def) { return !(ret = def.spell); });
+  return ret;
+}
+
+std::vector<Use> GetFuncDeclarations(DB *db, const std::vector<Usr> &usrs) {
+  return GetDeclarations(db->func_usr, db->funcs, usrs);
+}
+std::vector<Use> GetTypeDeclarations(DB *db, const std::vector<Usr> &usrs) {
+  return GetDeclarations(db->type_usr, db->types, usrs);
+}
+std::vector<Use> GetVarDeclarations(DB *db, const std::vector<Usr> &usrs,
+                                    unsigned kind) {
+  std::vector<Use> ret;
+  ret.reserve(usrs.size());
+  for (Usr usr : usrs) {
+    QueryVar &var = db->Var(usr);
+    bool has_def = false;
+    for (auto &def : var.def)
+      if (def.spell) {
+        has_def = true;
+        // See messages/ccls_vars.cc
+        if (def.kind == SymbolKind::Field) {
+          if (!(kind & 1))
+            break;
+        } else if (def.kind == SymbolKind::Variable) {
+          if (!(kind & 2))
+            break;
+        } else if (def.kind == SymbolKind::Parameter) {
+          if (!(kind & 4))
+            break;
+        }
+        ret.push_back(*def.spell);
+        break;
+      }
+    if (!has_def && var.declarations.size())
+      ret.push_back(var.declarations[0]);
+  }
+  return ret;
+}
+
+std::vector<DeclRef> &GetNonDefDeclarations(DB *db, SymbolIdx sym) {
+  static std::vector<DeclRef> empty;
+  switch (sym.kind) {
+  case Kind::Func:
+    return db->GetFunc(sym).declarations;
+  case Kind::Type:
+    return db->GetType(sym).declarations;
+  case Kind::Var:
+    return db->GetVar(sym).declarations;
+  default:
+    break;
+  }
+  return empty;
+}
+
+std::vector<Use> GetUsesForAllBases(DB *db, QueryFunc &root) {
+  std::vector<Use> ret;
+  std::vector<QueryFunc *> stack{&root};
+  std::unordered_set<Usr> seen;
+  seen.insert(root.usr);
+  while (!stack.empty()) {
+    QueryFunc &func = *stack.back();
+    stack.pop_back();
+    if (auto *def = func.AnyDef()) {
+      EachDefinedFunc(db, def->bases, [&](QueryFunc &func1) {
+        if (!seen.count(func1.usr)) {
+          seen.insert(func1.usr);
+          stack.push_back(&func1);
+          ret.insert(ret.end(), func1.uses.begin(), func1.uses.end());
+        }
+      });
+    }
+  }
+
+  return ret;
+}
+
+std::vector<Use> GetUsesForAllDerived(DB *db, QueryFunc &root) {
+  std::vector<Use> ret;
+  std::vector<QueryFunc *> stack{&root};
+  std::unordered_set<Usr> seen;
+  seen.insert(root.usr);
+  while (!stack.empty()) {
+    QueryFunc &func = *stack.back();
+    stack.pop_back();
+    EachDefinedFunc(db, func.derived, [&](QueryFunc &func1) {
+      if (!seen.count(func1.usr)) {
+        seen.insert(func1.usr);
+        stack.push_back(&func1);
+        ret.insert(ret.end(), func1.uses.begin(), func1.uses.end());
+      }
+    });
+  }
+
+  return ret;
+}
+
+std::optional<lsRange> GetLsRange(WorkingFile *wfile,
+                                  const Range &location) {
+  if (!wfile || wfile->index_lines.empty())
+    return lsRange{Position{location.start.line, location.start.column},
+                   Position{location.end.line, location.end.column}};
+
+  int start_column = location.start.column, end_column = location.end.column;
+  std::optional<int> start = wfile->GetBufferPosFromIndexPos(
+      location.start.line, &start_column, false);
+  std::optional<int> end = wfile->GetBufferPosFromIndexPos(
+      location.end.line, &end_column, true);
+  if (!start || !end)
+    return std::nullopt;
+
+  // If remapping end fails (end can never be < start), just guess that the
+  // final location didn't move. This only screws up the highlighted code
+  // region if we guess wrong, so not a big deal.
+  //
+  // Remapping fails often in C++ since there are a lot of "};" at the end of
+  // class/struct definitions.
+  if (*end < *start)
+    *end = *start + (location.end.line - location.start.line);
+  if (*start == *end && start_column > end_column)
+    end_column = start_column;
+
+  return lsRange{Position{*start, start_column}, Position{*end, end_column}};
+}
+
+DocumentUri GetLsDocumentUri(DB *db, int file_id, std::string *path) {
+  QueryFile &file = db->files[file_id];
+  if (file.def) {
+    *path = file.def->path;
+    return DocumentUri::FromPath(*path);
+  } else {
+    *path = "";
+    return DocumentUri::FromPath("");
+  }
+}
+
+DocumentUri GetLsDocumentUri(DB *db, int file_id) {
+  QueryFile &file = db->files[file_id];
+  if (file.def) {
+    return DocumentUri::FromPath(file.def->path);
+  } else {
+    return DocumentUri::FromPath("");
+  }
+}
+
+std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles, Use use) {
+  std::string path;
+  DocumentUri uri = GetLsDocumentUri(db, use.file_id, &path);
+  std::optional<lsRange> range =
+      GetLsRange(wfiles->GetFileByFilename(path), use.range);
+  if (!range)
+    return std::nullopt;
+  return Location{uri, *range};
+}
+
+std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles,
+                                      SymbolRef sym, int file_id) {
+  return GetLsLocation(db, wfiles, Use{{sym.range, sym.role}, file_id});
+}
+
+std::vector<Location> GetLsLocations(DB *db, WorkingFiles *wfiles,
+                                     const std::vector<Use> &uses) {
+  std::vector<Location> ret;
+  for (Use use : uses)
+    if (auto loc = GetLsLocation(db, wfiles, use))
+      ret.push_back(*loc);
+  std::sort(ret.begin(), ret.end());
+  ret.erase(std::unique(ret.begin(), ret.end()), ret.end());
+  if (ret.size() > g_config->xref.maxNum)
+    ret.resize(g_config->xref.maxNum);
+  return ret;
+}
+
+SymbolKind GetSymbolKind(DB *db, SymbolIdx sym) {
+  SymbolKind ret;
+  if (sym.kind == Kind::File)
+    ret = SymbolKind::File;
+  else {
+    ret = SymbolKind::Unknown;
+    WithEntity(db, sym, [&](const auto &entity) {
+      for (auto &def : entity.def) {
+        ret = def.kind;
+        break;
+      }
+    });
+  }
+  return ret;
+}
+
+std::optional<SymbolInformation> GetSymbolInfo(DB *db, SymbolIdx sym,
+                                               bool detailed) {
+  switch (sym.kind) {
+  case Kind::Invalid:
+    break;
+  case Kind::File: {
+    QueryFile &file = db->GetFile(sym);
+    if (!file.def)
+      break;
+
+    SymbolInformation info;
+    info.name = file.def->path;
+    info.kind = SymbolKind::File;
+    return info;
+  }
+  default: {
+    SymbolInformation info;
+    EachEntityDef(db, sym, [&](const auto &def) {
+      if (detailed)
+        info.name = def.detailed_name;
+      else
+        info.name = def.Name(true);
+      info.kind = def.kind;
+      return false;
+    });
+    return info;
+  }
+  }
+
+  return std::nullopt;
+}
+
+std::vector<SymbolRef> FindSymbolsAtLocation(WorkingFile *wfile,
+                                             QueryFile *file, Position &ls_pos,
+                                             bool smallest) {
+  std::vector<SymbolRef> symbols;
+  // If multiVersion > 0, index may not exist and thus index_lines is empty.
+  if (wfile && wfile->index_lines.size()) {
+    if (auto line = wfile->GetIndexPosFromBufferPos(
+            ls_pos.line, &ls_pos.character, false)) {
+      ls_pos.line = *line;
+    } else {
+      ls_pos.line = -1;
+      return {};
+    }
+  }
+
+  for (auto [sym, refcnt] : file->symbol2refcnt)
+    if (refcnt > 0 && sym.range.Contains(ls_pos.line, ls_pos.character))
+      symbols.push_back(sym);
+
+  // Order shorter ranges first, since they are more detailed/precise. This is
+  // important for macros which generate code so that we can resolving the
+  // macro argument takes priority over the entire macro body.
+  //
+  // Order Kind::Var before Kind::Type. Macro calls are treated as Var
+  // currently. If a macro expands to tokens led by a Kind::Type, the macro and
+  // the Type have the same range. We want to find the macro definition instead
+  // of the Type definition.
+  //
+  // Then order functions before other types, which makes goto definition work
+  // better on constructors.
+  std::sort(
+      symbols.begin(), symbols.end(),
+      [](const SymbolRef &a, const SymbolRef &b) {
+        int t = ComputeRangeSize(a.range) - ComputeRangeSize(b.range);
+        if (t)
+          return t < 0;
+        // MacroExpansion
+        if ((t = (a.role & Role::Dynamic) - (b.role & Role::Dynamic)))
+          return t > 0;
+        if ((t = (a.role & Role::Definition) - (b.role & Role::Definition)))
+          return t > 0;
+        // operator> orders Var/Func before Type.
+        t = static_cast<int>(a.kind) - static_cast<int>(b.kind);
+        if (t)
+          return t > 0;
+        return a.usr < b.usr;
+      });
+  if (symbols.size() && smallest) {
+    SymbolRef sym = symbols[0];
+    for (size_t i = 1; i < symbols.size(); i++)
+      if (!(sym.range == symbols[i].range && sym.kind == symbols[i].kind)) {
+        symbols.resize(i);
+        break;
+      }
+  }
+
+  return symbols;
+}
 } // namespace ccls
diff --git a/src/query.hh b/src/query.hh
index 3dbc1fe4..49e6558a 100644
--- a/src/query.hh
+++ b/src/query.hh
@@ -5,6 +5,7 @@
 
 #include "indexer.hh"
 #include "serializer.hh"
+#include "working_files.hh"
 
 #include <llvm/ADT/DenseMap.h>
 #include <llvm/ADT/SmallVector.h>
@@ -185,4 +186,87 @@ struct DB {
   QueryType &GetType(SymbolIdx ref) { return Type(ref.usr); }
   QueryVar &GetVar(SymbolIdx ref) { return Var(ref.usr); }
 };
+
+Maybe<DeclRef> GetDefinitionSpell(DB *db, SymbolIdx sym);
+
+// Get defining declaration (if exists) or an arbitrary declaration (otherwise)
+// for each id.
+std::vector<Use> GetFuncDeclarations(DB *, const std::vector<Usr> &);
+std::vector<Use> GetTypeDeclarations(DB *, const std::vector<Usr> &);
+std::vector<Use> GetVarDeclarations(DB *, const std::vector<Usr> &, unsigned);
+
+// Get non-defining declarations.
+std::vector<DeclRef> &GetNonDefDeclarations(DB *db, SymbolIdx sym);
+
+std::vector<Use> GetUsesForAllBases(DB *db, QueryFunc &root);
+std::vector<Use> GetUsesForAllDerived(DB *db, QueryFunc &root);
+std::optional<lsRange> GetLsRange(WorkingFile *working_file,
+                                  const Range &location);
+DocumentUri GetLsDocumentUri(DB *db, int file_id, std::string *path);
+DocumentUri GetLsDocumentUri(DB *db, int file_id);
+
+std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles, Use use);
+std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles,
+                                        SymbolRef sym, int file_id);
+std::vector<Location> GetLsLocations(DB *db, WorkingFiles *wfiles,
+                                           const std::vector<Use> &uses);
+// Returns a symbol. The symbol will *NOT* have a location assigned.
+std::optional<SymbolInformation> GetSymbolInfo(DB *db, SymbolIdx sym,
+                                                 bool detailed);
+
+std::vector<SymbolRef> FindSymbolsAtLocation(WorkingFile *working_file,
+                                             QueryFile *file,
+                                             Position &ls_pos,
+                                             bool smallest = false);
+
+template <typename Fn> void WithEntity(DB *db, SymbolIdx sym, Fn &&fn) {
+  switch (sym.kind) {
+  case Kind::Invalid:
+  case Kind::File:
+    break;
+  case Kind::Func:
+    fn(db->GetFunc(sym));
+    break;
+  case Kind::Type:
+    fn(db->GetType(sym));
+    break;
+  case Kind::Var:
+    fn(db->GetVar(sym));
+    break;
+  }
+}
+
+template <typename Fn> void EachEntityDef(DB *db, SymbolIdx sym, Fn &&fn) {
+  WithEntity(db, sym, [&](const auto &entity) {
+    for (auto &def : entity.def)
+      if (!fn(def))
+        break;
+  });
+}
+
+template <typename Fn>
+void EachOccurrence(DB *db, SymbolIdx sym, bool include_decl, Fn &&fn) {
+  WithEntity(db, sym, [&](const auto &entity) {
+    for (Use use : entity.uses)
+      fn(use);
+    if (include_decl) {
+      for (auto &def : entity.def)
+        if (def.spell)
+          fn(*def.spell);
+      for (Use use : entity.declarations)
+        fn(use);
+    }
+  });
+}
+
+SymbolKind GetSymbolKind(DB *db, SymbolIdx sym);
+
+template <typename Fn>
+void EachDefinedFunc(DB *db, const std::vector<Usr> &usrs, Fn &&fn) {
+  for (Usr usr : usrs) {
+    auto &obj = db->Func(usr);
+    if (!obj.def.empty())
+      fn(obj);
+  }
+}
 } // namespace ccls
diff --git a/src/query_utils.cc b/src/query_utils.cc
deleted file mode 100644
index 049e7809..00000000
--- a/src/query_utils.cc
+++ /dev/null
@@ -1,325 +0,0 @@
-// Copyright 2017-2018 ccls Authors
-// SPDX-License-Identifier: Apache-2.0
-
-#include "query_utils.hh"
-
-#include "pipeline.hh"
-
-#include <limits.h>
-#include <unordered_set>
-
-namespace ccls {
-namespace {
-
-// Computes roughly how long |range| is.
-int ComputeRangeSize(const Range &range) {
-  if (range.start.line != range.end.line)
-    return INT_MAX;
-  return range.end.column - range.start.column;
-}
-
-template <typename Q>
-std::vector<Use>
-GetDeclarations(llvm::DenseMap<Usr, int, DenseMapInfoForUsr> &entity_usr,
-                std::vector<Q> &entities, const std::vector<Usr> &usrs) {
-  std::vector<Use> ret;
-  ret.reserve(usrs.size());
-  for (Usr usr : usrs) {
-    Q &entity = entities[entity_usr[{usr}]];
-    bool has_def = false;
-    for (auto &def : entity.def)
-      if (def.spell) {
-        ret.push_back(*def.spell);
-        has_def = true;
-        break;
-      }
-    if (!has_def && entity.declarations.size())
-      ret.push_back(entity.declarations[0]);
-  }
-  return ret;
-}
-
-} // namespace
-
-Maybe<DeclRef> GetDefinitionSpell(DB *db, SymbolIdx sym) {
-  Maybe<DeclRef> ret;
-  EachEntityDef(db, sym, [&](const auto &def) { return !(ret = def.spell); });
-  return ret;
-}
-
-std::vector<Use> GetFuncDeclarations(DB *db, const std::vector<Usr> &usrs) {
-  return GetDeclarations(db->func_usr, db->funcs, usrs);
-}
-std::vector<Use> GetTypeDeclarations(DB *db, const std::vector<Usr> &usrs) {
-  return GetDeclarations(db->type_usr, db->types, usrs);
-}
-std::vector<Use> GetVarDeclarations(DB *db, const std::vector<Usr> &usrs,
-                                    unsigned kind) {
-  std::vector<Use> ret;
-  ret.reserve(usrs.size());
-  for (Usr usr : usrs) {
-    QueryVar &var = db->Var(usr);
-    bool has_def = false;
-    for (auto &def : var.def)
-      if (def.spell) {
-        has_def = true;
-        // See messages/ccls_vars.cc
-        if (def.kind == SymbolKind::Field) {
-          if (!(kind & 1))
-            break;
-        } else if (def.kind == SymbolKind::Variable) {
-          if (!(kind & 2))
-            break;
-        } else if (def.kind == SymbolKind::Parameter) {
-          if (!(kind & 4))
-            break;
-        }
-        ret.push_back(*def.spell);
-        break;
-      }
-    if (!has_def && var.declarations.size())
-      ret.push_back(var.declarations[0]);
-  }
-  return ret;
-}
-
-std::vector<DeclRef> &GetNonDefDeclarations(DB *db, SymbolIdx sym) {
-  static std::vector<DeclRef> empty;
-  switch (sym.kind) {
-  case Kind::Func:
-    return db->GetFunc(sym).declarations;
-  case Kind::Type:
-    return db->GetType(sym).declarations;
-  case Kind::Var:
-    return db->GetVar(sym).declarations;
-  default:
-    break;
-  }
-  return empty;
-}
-
-std::vector<Use> GetUsesForAllBases(DB *db, QueryFunc &root) {
-  std::vector<Use> ret;
-  std::vector<QueryFunc *> stack{&root};
-  std::unordered_set<Usr> seen;
-  seen.insert(root.usr);
-  while (!stack.empty()) {
-    QueryFunc &func = *stack.back();
-    stack.pop_back();
-    if (auto *def = func.AnyDef()) {
-      EachDefinedFunc(db, def->bases, [&](QueryFunc &func1) {
-        if (!seen.count(func1.usr)) {
-          seen.insert(func1.usr);
-          stack.push_back(&func1);
-          ret.insert(ret.end(), func1.uses.begin(), func1.uses.end());
-        }
-      });
-    }
-  }
-
-  return ret;
-}
-
-std::vector<Use> GetUsesForAllDerived(DB *db, QueryFunc &root) {
-  std::vector<Use> ret;
-  std::vector<QueryFunc *> stack{&root};
-  std::unordered_set<Usr> seen;
-  seen.insert(root.usr);
-  while (!stack.empty()) {
-    QueryFunc &func = *stack.back();
-    stack.pop_back();
-    EachDefinedFunc(db, func.derived, [&](QueryFunc &func1) {
-      if (!seen.count(func1.usr)) {
-        seen.insert(func1.usr);
-        stack.push_back(&func1);
-        ret.insert(ret.end(), func1.uses.begin(), func1.uses.end());
-      }
-    });
-  }
-
-  return ret;
-}
-
-std::optional<lsRange> GetLsRange(WorkingFile *wfile,
-                                  const Range &location) {
-  if (!wfile || wfile->index_lines.empty())
-    return lsRange{Position{location.start.line, location.start.column},
-                   Position{location.end.line, location.end.column}};
-
-  int start_column = location.start.column, end_column = location.end.column;
-  std::optional<int> start = wfile->GetBufferPosFromIndexPos(
-      location.start.line, &start_column, false);
-  std::optional<int> end = wfile->GetBufferPosFromIndexPos(
-      location.end.line, &end_column, true);
-  if (!start || !end)
-    return std::nullopt;
-
-  // If remapping end fails (end can never be < start), just guess that the
-  // final location didn't move. This only screws up the highlighted code
-  // region if we guess wrong, so not a big deal.
-  //
-  // Remapping fails often in C++ since there are a lot of "};" at the end of
-  // class/struct definitions.
-  if (*end < *start)
-    *end = *start + (location.end.line - location.start.line);
-  if (*start == *end && start_column > end_column)
-    end_column = start_column;
-
-  return lsRange{Position{*start, start_column}, Position{*end, end_column}};
-}
-
-DocumentUri GetLsDocumentUri(DB *db, int file_id, std::string *path) {
-  QueryFile &file = db->files[file_id];
-  if (file.def) {
-    *path = file.def->path;
-    return DocumentUri::FromPath(*path);
-  } else {
-    *path = "";
-    return DocumentUri::FromPath("");
-  }
-}
-
-DocumentUri GetLsDocumentUri(DB *db, int file_id) {
-  QueryFile &file = db->files[file_id];
-  if (file.def) {
-    return DocumentUri::FromPath(file.def->path);
-  } else {
-    return DocumentUri::FromPath("");
-  }
-}
-
-std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles, Use use) {
-  std::string path;
-  DocumentUri uri = GetLsDocumentUri(db, use.file_id, &path);
-  std::optional<lsRange> range =
-      GetLsRange(wfiles->GetFileByFilename(path), use.range);
-  if (!range)
-    return std::nullopt;
-  return Location{uri, *range};
-}
-
-std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles,
-                                      SymbolRef sym, int file_id) {
-  return GetLsLocation(db, wfiles, Use{{sym.range, sym.role}, file_id});
-}
-
-std::vector<Location> GetLsLocations(DB *db, WorkingFiles *wfiles,
-                                     const std::vector<Use> &uses) {
-  std::vector<Location> ret;
-  for (Use use : uses)
-    if (auto loc = GetLsLocation(db, wfiles, use))
-      ret.push_back(*loc);
-  std::sort(ret.begin(), ret.end());
-  ret.erase(std::unique(ret.begin(), ret.end()), ret.end());
-  if (ret.size() > g_config->xref.maxNum)
-    ret.resize(g_config->xref.maxNum);
-  return ret;
-}
-
-SymbolKind GetSymbolKind(DB *db, SymbolIdx sym) {
-  SymbolKind ret;
-  if (sym.kind == Kind::File)
-    ret = SymbolKind::File;
-  else {
-    ret = SymbolKind::Unknown;
-    WithEntity(db, sym, [&](const auto &entity) {
-      for (auto &def : entity.def) {
-        ret = def.kind;
-        break;
-      }
-    });
-  }
-  return ret;
-}
-
-std::optional<SymbolInformation> GetSymbolInfo(DB *db, SymbolIdx sym,
-                                               bool detailed) {
-  switch (sym.kind) {
-  case Kind::Invalid:
-    break;
-  case Kind::File: {
-    QueryFile &file = db->GetFile(sym);
-    if (!file.def)
-      break;
-
-    SymbolInformation info;
-    info.name = file.def->path;
-    info.kind = SymbolKind::File;
-    return info;
-  }
-  default: {
-    SymbolInformation info;
-    EachEntityDef(db, sym, [&](const auto &def) {
-      if (detailed)
-        info.name = def.detailed_name;
-      else
-        info.name = def.Name(true);
-      info.kind = def.kind;
-      return false;
-    });
-    return info;
-  }
-  }
-
-  return std::nullopt;
-}
-
-std::vector<SymbolRef> FindSymbolsAtLocation(WorkingFile *wfile,
-                                             QueryFile *file, Position &ls_pos,
-                                             bool smallest) {
-  std::vector<SymbolRef> symbols;
-  // If multiVersion > 0, index may not exist and thus index_lines is empty.
-  if (wfile && wfile->index_lines.size()) {
-    if (auto line = wfile->GetIndexPosFromBufferPos(
-            ls_pos.line, &ls_pos.character, false)) {
-      ls_pos.line = *line;
-    } else {
-      ls_pos.line = -1;
-      return {};
-    }
-  }
-
-  for (auto [sym, refcnt] : file->symbol2refcnt)
-    if (refcnt > 0 && sym.range.Contains(ls_pos.line, ls_pos.character))
-      symbols.push_back(sym);
-
-  // Order shorter ranges first, since they are more detailed/precise. This is
-  // important for macros which generate code so that we can resolving the
-  // macro argument takes priority over the entire macro body.
-  //
-  // Order Kind::Var before Kind::Type. Macro calls are treated as Var
-  // currently. If a macro expands to tokens led by a Kind::Type, the macro and
-  // the Type have the same range. We want to find the macro definition instead
-  // of the Type definition.
-  //
-  // Then order functions before other types, which makes goto definition work
-  // better on constructors.
-  std::sort(
-      symbols.begin(), symbols.end(),
-      [](const SymbolRef &a, const SymbolRef &b) {
-        int t = ComputeRangeSize(a.range) - ComputeRangeSize(b.range);
-        if (t)
-          return t < 0;
-        // MacroExpansion
-        if ((t = (a.role & Role::Dynamic) - (b.role & Role::Dynamic)))
-          return t > 0;
-        if ((t = (a.role & Role::Definition) - (b.role & Role::Definition)))
-          return t > 0;
-        // operator> orders Var/Func before Type.
-        t = static_cast<int>(a.kind) - static_cast<int>(b.kind);
-        if (t)
-          return t > 0;
-        return a.usr < b.usr;
-      });
-  if (symbols.size() && smallest) {
-    SymbolRef sym = symbols[0];
-    for (size_t i = 1; i < symbols.size(); i++)
-      if (!(sym.range == symbols[i].range && sym.kind == symbols[i].kind)) {
-        symbols.resize(i);
-        break;
-      }
-  }
-
-  return symbols;
-}
-} // namespace ccls
diff --git a/src/query_utils.hh b/src/query_utils.hh
deleted file mode 100644
index 9803350f..00000000
--- a/src/query_utils.hh
+++ /dev/null
@@ -1,94 +0,0 @@
-// Copyright 2017-2018 ccls Authors
-// SPDX-License-Identifier: Apache-2.0
-
-#pragma once
-
-#include "query.hh"
-#include "working_files.hh"
-
-#include <optional>
-
-namespace ccls {
-Maybe<DeclRef> GetDefinitionSpell(DB *db, SymbolIdx sym);
-
-// Get defining declaration (if exists) or an arbitrary declaration (otherwise)
-// for each id.
-std::vector<Use> GetFuncDeclarations(DB *, const std::vector<Usr> &);
-std::vector<Use> GetTypeDeclarations(DB *, const std::vector<Usr> &);
-std::vector<Use> GetVarDeclarations(DB *, const std::vector<Usr> &, unsigned);
-
-// Get non-defining declarations.
-std::vector<DeclRef> &GetNonDefDeclarations(DB *db, SymbolIdx sym);
-
-std::vector<Use> GetUsesForAllBases(DB *db, QueryFunc &root);
-std::vector<Use> GetUsesForAllDerived(DB *db, QueryFunc &root);
-std::optional<lsRange> GetLsRange(WorkingFile *working_file,
-                                  const Range &location);
-DocumentUri GetLsDocumentUri(DB *db, int file_id, std::string *path);
-DocumentUri GetLsDocumentUri(DB *db, int file_id);
-
-std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles, Use use);
-std::optional<Location> GetLsLocation(DB *db, WorkingFiles *wfiles,
-                                        SymbolRef sym, int file_id);
-std::vector<Location> GetLsLocations(DB *db, WorkingFiles *wfiles,
-                                           const std::vector<Use> &uses);
-// Returns a symbol. The symbol will *NOT* have a location assigned.
-std::optional<SymbolInformation> GetSymbolInfo(DB *db, SymbolIdx sym,
-                                                 bool detailed);
-
-std::vector<SymbolRef> FindSymbolsAtLocation(WorkingFile *working_file,
-                                             QueryFile *file,
-                                             Position &ls_pos,
-                                             bool smallest = false);
-
-template <typename Fn> void WithEntity(DB *db, SymbolIdx sym, Fn &&fn) {
-  switch (sym.kind) {
-  case Kind::Invalid:
-  case Kind::File:
-    break;
-  case Kind::Func:
-    fn(db->GetFunc(sym));
-    break;
-  case Kind::Type:
-    fn(db->GetType(sym));
-    break;
-  case Kind::Var:
-    fn(db->GetVar(sym));
-    break;
-  }
-}
-
-template <typename Fn> void EachEntityDef(DB *db, SymbolIdx sym, Fn &&fn) {
-  WithEntity(db, sym, [&](const auto &entity) {
-    for (auto &def : entity.def)
-      if (!fn(def))
-        break;
-  });
-}
-
-template <typename Fn>
-void EachOccurrence(DB *db, SymbolIdx sym, bool include_decl, Fn &&fn) {
-  WithEntity(db, sym, [&](const auto &entity) {
-    for (Use use : entity.uses)
-      fn(use);
-    if (include_decl) {
-      for (auto &def : entity.def)
-        if (def.spell)
-          fn(*def.spell);
-      for (Use use : entity.declarations)
-        fn(use);
-    }
-  });
-}
-
-SymbolKind GetSymbolKind(DB *db, SymbolIdx sym);
-
-template <typename Fn>
-void EachDefinedFunc(DB *db, const std::vector<Usr> &usrs, Fn &&fn) {
-  for (Usr usr : usrs) {
-    auto &obj = db->Func(usr);
-    if (!obj.def.empty())
-      fn(obj);
-  }
-}
-} // namespace ccls