diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3985e129..6b447d76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -181,7 +181,6 @@ target_sources(ccls PRIVATE third_party/siphash.cc)
 target_sources(ccls PRIVATE
   src/clang_complete.cc
   src/clang_tu.cc
-  src/clang_utils.cc
   src/config.cc
   src/filesystem.cc
   src/fuzzy_match.cc
diff --git a/src/clang_complete.cc b/src/clang_complete.cc
index 41b855bc..dd825fd2 100644
--- a/src/clang_complete.cc
+++ b/src/clang_complete.cc
@@ -3,13 +3,12 @@
 
 #include "clang_complete.hh"
 
-#include "clang_utils.h"
+#include "clang_tu.hh"
 #include "filesystem.hh"
 #include "log.hh"
 #include "match.h"
 #include "platform.h"
 
-#include <clang/Frontend/CompilerInstance.h>
 #include <clang/Lex/PreprocessorOptions.h>
 #include <clang/Sema/CodeCompleteConsumer.h>
 #include <clang/Sema/Sema.h>
@@ -96,7 +95,7 @@ public:
     auto it = FID2concerned.try_emplace(FID.getHashValue());
     if (it.second) {
       const FileEntry *FE = SM.getFileEntryForID(FID);
-      it.first->second = FE && FileName(*FE) == path;
+      it.first->second = FE && PathFromFileEntry(*FE) == path;
     }
     return it.first->second;
   }
diff --git a/src/clang_complete.hh b/src/clang_complete.hh
index 677bc204..eb749169 100644
--- a/src/clang_complete.hh
+++ b/src/clang_complete.hh
@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "clang_tu.h"
+#include "clang_tu.hh"
 #include "lru_cache.h"
 #include "lsp_completion.h"
 #include "lsp_diagnostic.h"
diff --git a/src/clang_tu.cc b/src/clang_tu.cc
index 2986544e..ef717981 100644
--- a/src/clang_tu.cc
+++ b/src/clang_tu.cc
@@ -1,16 +1,32 @@
 // Copyright 2017-2018 ccls Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#include "clang_tu.h"
+#include "clang_tu.hh"
 
-#include "clang_utils.h"
 #include "config.h"
+#include "platform.h"
 
+#include <clang/AST/Type.h>
 #include <clang/Lex/Lexer.h>
+#include <llvm/Support/Path.h>
+
+#include <mutex>
+
 using namespace clang;
 
-#include <assert.h>
-#include <mutex>
+std::string PathFromFileEntry(const FileEntry &file) {
+  StringRef Name = file.tryGetRealPathName();
+  if (Name.empty())
+    Name = file.getName();
+  std::string ret = NormalizePath(Name);
+  // Resolve /usr/include/c++/7.3.0 symlink.
+  if (!StartsWith(ret, g_config->projectRoot)) {
+    SmallString<256> dest;
+    llvm::sys::fs::real_path(ret, dest);
+    ret = llvm::sys::path::convert_to_slash(dest.str());
+  }
+  return ret;
+}
 
 Range FromCharSourceRange(const SourceManager &SM, const LangOptions &LangOpts,
                           CharSourceRange R,
@@ -69,3 +85,149 @@ BuildCompilerInvocation(std::vector<const char *> args,
   }
   return CI;
 }
+
+// clang::BuiltinType::getName without PrintingPolicy
+const char *ClangBuiltinTypeName(int kind) {
+  switch (BuiltinType::Kind(kind)) {
+  case BuiltinType::Void:
+    return "void";
+  case BuiltinType::Bool:
+    return "bool";
+  case BuiltinType::Char_S:
+  case BuiltinType::Char_U:
+    return "char";
+  case BuiltinType::SChar:
+    return "signed char";
+  case BuiltinType::Short:
+    return "short";
+  case BuiltinType::Int:
+    return "int";
+  case BuiltinType::Long:
+    return "long";
+  case BuiltinType::LongLong:
+    return "long long";
+  case BuiltinType::Int128:
+    return "__int128";
+  case BuiltinType::UChar:
+    return "unsigned char";
+  case BuiltinType::UShort:
+    return "unsigned short";
+  case BuiltinType::UInt:
+    return "unsigned int";
+  case BuiltinType::ULong:
+    return "unsigned long";
+  case BuiltinType::ULongLong:
+    return "unsigned long long";
+  case BuiltinType::UInt128:
+    return "unsigned __int128";
+  case BuiltinType::Half:
+    return "__fp16";
+  case BuiltinType::Float:
+    return "float";
+  case BuiltinType::Double:
+    return "double";
+  case BuiltinType::LongDouble:
+    return "long double";
+#if LLVM_VERSION_MAJOR >= 7
+  case BuiltinType::ShortAccum:
+    return "short _Accum";
+  case BuiltinType::Accum:
+    return "_Accum";
+  case BuiltinType::LongAccum:
+    return "long _Accum";
+  case BuiltinType::UShortAccum:
+    return "unsigned short _Accum";
+  case BuiltinType::UAccum:
+    return "unsigned _Accum";
+  case BuiltinType::ULongAccum:
+    return "unsigned long _Accum";
+  case BuiltinType::BuiltinType::ShortFract:
+    return "short _Fract";
+  case BuiltinType::BuiltinType::Fract:
+    return "_Fract";
+  case BuiltinType::BuiltinType::LongFract:
+    return "long _Fract";
+  case BuiltinType::BuiltinType::UShortFract:
+    return "unsigned short _Fract";
+  case BuiltinType::BuiltinType::UFract:
+    return "unsigned _Fract";
+  case BuiltinType::BuiltinType::ULongFract:
+    return "unsigned long _Fract";
+  case BuiltinType::BuiltinType::SatShortAccum:
+    return "_Sat short _Accum";
+  case BuiltinType::BuiltinType::SatAccum:
+    return "_Sat _Accum";
+  case BuiltinType::BuiltinType::SatLongAccum:
+    return "_Sat long _Accum";
+  case BuiltinType::BuiltinType::SatUShortAccum:
+    return "_Sat unsigned short _Accum";
+  case BuiltinType::BuiltinType::SatUAccum:
+    return "_Sat unsigned _Accum";
+  case BuiltinType::BuiltinType::SatULongAccum:
+    return "_Sat unsigned long _Accum";
+  case BuiltinType::BuiltinType::SatShortFract:
+    return "_Sat short _Fract";
+  case BuiltinType::BuiltinType::SatFract:
+    return "_Sat _Fract";
+  case BuiltinType::BuiltinType::SatLongFract:
+    return "_Sat long _Fract";
+  case BuiltinType::BuiltinType::SatUShortFract:
+    return "_Sat unsigned short _Fract";
+  case BuiltinType::BuiltinType::SatUFract:
+    return "_Sat unsigned _Fract";
+  case BuiltinType::BuiltinType::SatULongFract:
+    return "_Sat unsigned long _Fract";
+#endif
+  case BuiltinType::Float16:
+    return "_Float16";
+  case BuiltinType::Float128:
+    return "__float128";
+  case BuiltinType::WChar_S:
+  case BuiltinType::WChar_U:
+    return "wchar_t";
+#if LLVM_VERSION_MAJOR >= 7
+  case BuiltinType::Char8:
+    return "char8_t";
+#endif
+  case BuiltinType::Char16:
+    return "char16_t";
+  case BuiltinType::Char32:
+    return "char32_t";
+  case BuiltinType::NullPtr:
+    return "nullptr_t";
+  case BuiltinType::Overload:
+    return "<overloaded function type>";
+  case BuiltinType::BoundMember:
+    return "<bound member function type>";
+  case BuiltinType::PseudoObject:
+    return "<pseudo-object type>";
+  case BuiltinType::Dependent:
+    return "<dependent type>";
+  case BuiltinType::UnknownAny:
+    return "<unknown type>";
+  case BuiltinType::ARCUnbridgedCast:
+    return "<ARC unbridged cast type>";
+  case BuiltinType::BuiltinFn:
+    return "<builtin fn type>";
+  case BuiltinType::ObjCId:
+    return "id";
+  case BuiltinType::ObjCClass:
+    return "Class";
+  case BuiltinType::ObjCSel:
+    return "SEL";
+  case BuiltinType::OCLSampler:
+    return "sampler_t";
+  case BuiltinType::OCLEvent:
+    return "event_t";
+  case BuiltinType::OCLClkEvent:
+    return "clk_event_t";
+  case BuiltinType::OCLQueue:
+    return "queue_t";
+  case BuiltinType::OCLReserveID:
+    return "reserve_id_t";
+  case BuiltinType::OMPArraySection:
+    return "<OpenMP array section type>";
+  default:
+    return "";
+  }
+}
diff --git a/src/clang_tu.h b/src/clang_tu.hh
similarity index 88%
rename from src/clang_tu.h
rename to src/clang_tu.hh
index 8e104e18..c790aa69 100644
--- a/src/clang_tu.h
+++ b/src/clang_tu.hh
@@ -2,13 +2,15 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #pragma once
+
 #include "position.h"
 
 #include <clang/Basic/LangOptions.h>
+#include <clang/Basic/FileManager.h>
 #include <clang/Basic/SourceManager.h>
 #include <clang/Frontend/CompilerInstance.h>
 
-#include <stdlib.h>
+std::string PathFromFileEntry(const clang::FileEntry &file);
 
 Range FromCharSourceRange(const clang::SourceManager &SM,
                           const clang::LangOptions &LangOpts,
@@ -26,3 +28,5 @@ Range FromTokenRange(const clang::SourceManager &SM,
 std::unique_ptr<clang::CompilerInvocation>
 BuildCompilerInvocation(std::vector<const char *> args,
                         llvm::IntrusiveRefCntPtr<clang::vfs::FileSystem> VFS);
+
+const char *ClangBuiltinTypeName(int);
diff --git a/src/clang_utils.cc b/src/clang_utils.cc
deleted file mode 100644
index 1026a6f3..00000000
--- a/src/clang_utils.cc
+++ /dev/null
@@ -1,175 +0,0 @@
-// Copyright 2017-2018 ccls Authors
-// SPDX-License-Identifier: Apache-2.0
-
-#include "clang_utils.h"
-
-#include "config.h"
-#include "filesystem.hh"
-#include "platform.h"
-#include "utils.h"
-
-#include <clang/AST/Type.h>
-#include <llvm/Config/llvm-config.h>
-using namespace clang;
-using namespace llvm;
-
-std::string FileName(const FileEntry &file) {
-  StringRef Name = file.tryGetRealPathName();
-  if (Name.empty())
-    Name = file.getName();
-  std::string ret = NormalizePath(Name);
-  // Resolve /usr/include/c++/7.3.0 symlink.
-  if (!StartsWith(ret, g_config->projectRoot)) {
-    SmallString<256> dest;
-    sys::fs::real_path(ret, dest);
-    ret = sys::path::convert_to_slash(dest.str());
-  }
-  return ret;
-}
-
-// clang::BuiltinType::getName without PrintingPolicy
-const char *ClangBuiltinTypeName(int kind) {
-  switch (BuiltinType::Kind(kind)) {
-  case BuiltinType::Void:
-    return "void";
-  case BuiltinType::Bool:
-    return "bool";
-  case BuiltinType::Char_S:
-    return "char";
-  case BuiltinType::Char_U:
-    return "char";
-  case BuiltinType::SChar:
-    return "signed char";
-  case BuiltinType::Short:
-    return "short";
-  case BuiltinType::Int:
-    return "int";
-  case BuiltinType::Long:
-    return "long";
-  case BuiltinType::LongLong:
-    return "long long";
-  case BuiltinType::Int128:
-    return "__int128";
-  case BuiltinType::UChar:
-    return "unsigned char";
-  case BuiltinType::UShort:
-    return "unsigned short";
-  case BuiltinType::UInt:
-    return "unsigned int";
-  case BuiltinType::ULong:
-    return "unsigned long";
-  case BuiltinType::ULongLong:
-    return "unsigned long long";
-  case BuiltinType::UInt128:
-    return "unsigned __int128";
-  case BuiltinType::Half:
-    return "__fp16";
-  case BuiltinType::Float:
-    return "float";
-  case BuiltinType::Double:
-    return "double";
-  case BuiltinType::LongDouble:
-    return "long double";
-#if LLVM_VERSION_MAJOR >= 7
-  case BuiltinType::ShortAccum:
-    return "short _Accum";
-  case BuiltinType::Accum:
-    return "_Accum";
-  case BuiltinType::LongAccum:
-    return "long _Accum";
-  case BuiltinType::UShortAccum:
-    return "unsigned short _Accum";
-  case BuiltinType::UAccum:
-    return "unsigned _Accum";
-  case BuiltinType::ULongAccum:
-    return "unsigned long _Accum";
-  case BuiltinType::BuiltinType::ShortFract:
-    return "short _Fract";
-  case BuiltinType::BuiltinType::Fract:
-    return "_Fract";
-  case BuiltinType::BuiltinType::LongFract:
-    return "long _Fract";
-  case BuiltinType::BuiltinType::UShortFract:
-    return "unsigned short _Fract";
-  case BuiltinType::BuiltinType::UFract:
-    return "unsigned _Fract";
-  case BuiltinType::BuiltinType::ULongFract:
-    return "unsigned long _Fract";
-  case BuiltinType::BuiltinType::SatShortAccum:
-    return "_Sat short _Accum";
-  case BuiltinType::BuiltinType::SatAccum:
-    return "_Sat _Accum";
-  case BuiltinType::BuiltinType::SatLongAccum:
-    return "_Sat long _Accum";
-  case BuiltinType::BuiltinType::SatUShortAccum:
-    return "_Sat unsigned short _Accum";
-  case BuiltinType::BuiltinType::SatUAccum:
-    return "_Sat unsigned _Accum";
-  case BuiltinType::BuiltinType::SatULongAccum:
-    return "_Sat unsigned long _Accum";
-  case BuiltinType::BuiltinType::SatShortFract:
-    return "_Sat short _Fract";
-  case BuiltinType::BuiltinType::SatFract:
-    return "_Sat _Fract";
-  case BuiltinType::BuiltinType::SatLongFract:
-    return "_Sat long _Fract";
-  case BuiltinType::BuiltinType::SatUShortFract:
-    return "_Sat unsigned short _Fract";
-  case BuiltinType::BuiltinType::SatUFract:
-    return "_Sat unsigned _Fract";
-  case BuiltinType::BuiltinType::SatULongFract:
-    return "_Sat unsigned long _Fract";
-#endif
-  case BuiltinType::Float16:
-    return "_Float16";
-  case BuiltinType::Float128:
-    return "__float128";
-  case BuiltinType::WChar_S:
-  case BuiltinType::WChar_U:
-    return "wchar_t";
-#if LLVM_VERSION_MAJOR >= 7
-  case BuiltinType::Char8:
-    return "char8_t";
-#endif
-  case BuiltinType::Char16:
-    return "char16_t";
-  case BuiltinType::Char32:
-    return "char32_t";
-  case BuiltinType::NullPtr:
-    return "nullptr_t";
-  case BuiltinType::Overload:
-    return "<overloaded function type>";
-  case BuiltinType::BoundMember:
-    return "<bound member function type>";
-  case BuiltinType::PseudoObject:
-    return "<pseudo-object type>";
-  case BuiltinType::Dependent:
-    return "<dependent type>";
-  case BuiltinType::UnknownAny:
-    return "<unknown type>";
-  case BuiltinType::ARCUnbridgedCast:
-    return "<ARC unbridged cast type>";
-  case BuiltinType::BuiltinFn:
-    return "<builtin fn type>";
-  case BuiltinType::ObjCId:
-    return "id";
-  case BuiltinType::ObjCClass:
-    return "Class";
-  case BuiltinType::ObjCSel:
-    return "SEL";
-  case BuiltinType::OCLSampler:
-    return "sampler_t";
-  case BuiltinType::OCLEvent:
-    return "event_t";
-  case BuiltinType::OCLClkEvent:
-    return "clk_event_t";
-  case BuiltinType::OCLQueue:
-    return "queue_t";
-  case BuiltinType::OCLReserveID:
-    return "reserve_id_t";
-  case BuiltinType::OMPArraySection:
-    return "<OpenMP array section type>";
-  default:
-    return "";
-  }
-}
diff --git a/src/clang_utils.h b/src/clang_utils.h
deleted file mode 100644
index 9c43bd51..00000000
--- a/src/clang_utils.h
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2017-2018 ccls Authors
-// SPDX-License-Identifier: Apache-2.0
-
-#pragma once
-
-#include <clang/Basic/FileManager.h>
-
-#include <string>
-
-// Returns the absolute path to |file|.
-std::string FileName(const clang::FileEntry &file);
-
-const char *ClangBuiltinTypeName(int);
diff --git a/src/indexer.cc b/src/indexer.cc
index 84303b9b..bd37a012 100644
--- a/src/indexer.cc
+++ b/src/indexer.cc
@@ -4,7 +4,7 @@
 #include "indexer.h"
 
 #include "clang_complete.hh"
-#include "clang_tu.h"
+#include "clang_tu.hh"
 #include "log.hh"
 #include "match.h"
 #include "pipeline.hh"
@@ -61,7 +61,7 @@ struct IndexParam {
     // generating an index for it):
     auto [it, inserted] = UID2File.try_emplace(File.getUniqueID());
     if (inserted) {
-      std::string path = FileName(File);
+      std::string path = PathFromFileEntry(File);
       it->second.path = path;
       it->second.mtime = File.getModificationTime();
       if (!it->second.mtime)
@@ -85,7 +85,7 @@ struct IndexParam {
   bool UseMultiVersion(const FileEntry &FE) {
     auto it = UID2multi.try_emplace(FE.getUniqueID());
     if (it.second)
-      it.first->second = multiVersionMatcher->IsMatch(FileName(FE));
+      it.first->second = multiVersionMatcher->IsMatch(PathFromFileEntry(FE));
     return it.first->second;
   }
 };
@@ -1084,9 +1084,9 @@ public:
     if (!FE)
       return;
     if (IndexFile *db = param.ConsumeFile(*FE)) {
-      std::string file_name = FileName(*File);
-      if (file_name.size())
-        db->includes.push_back({spell.start.line, Intern(file_name)});
+      std::string path = PathFromFileEntry(*File);
+      if (path.size())
+        db->includes.push_back({spell.start.line, Intern(path)});
     }
   }
   void MacroDefined(const Token &Tok, const MacroDirective *MD) override {
diff --git a/src/indexer.h b/src/indexer.h
index 6d274166..dc9ccb76 100644
--- a/src/indexer.h
+++ b/src/indexer.h
@@ -3,7 +3,6 @@
 
 #pragma once
 
-#include "clang_utils.h"
 #include "language.h"
 #include "lsp.h"
 #include "lsp_diagnostic.h"
@@ -13,6 +12,7 @@
 #include "symbol.h"
 #include "utils.h"
 
+#include <clang/Basic/FileManager.h>
 #include <clang/Basic/Specifiers.h>
 #include <llvm/ADT/CachedHashString.h>
 #include <llvm/ADT/DenseMap.h>
diff --git a/src/messages/ccls_member.cc b/src/messages/ccls_member.cc
index 2c13b19d..3ea02645 100644
--- a/src/messages/ccls_member.cc
+++ b/src/messages/ccls_member.cc
@@ -1,6 +1,7 @@
 // Copyright 2017-2018 ccls Authors
 // SPDX-License-Identifier: Apache-2.0
 
+#include "clang_tu.hh"
 #include "hierarchy.hh"
 #include "message_handler.h"
 #include "pipeline.hh"
diff --git a/src/project.cc b/src/project.cc
index 2c0fcf6e..47709b39 100644
--- a/src/project.cc
+++ b/src/project.cc
@@ -3,7 +3,6 @@
 
 #include "project.h"
 
-#include "clang_utils.h"
 #include "filesystem.hh"
 #include "language.h"
 #include "log.hh"