--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/llvm-xray/llvm-xray.cpp	Wed Aug 14 19:46:37 2019 +0900
@@ -0,0 +1,48 @@
+//===- llvm-xray.cpp: XRay Tool Main Program ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the main entry point for the suite of XRay tools. All
+// additional functionality are implemented as subcommands.
+//
+//===----------------------------------------------------------------------===//
+//
+// Basic usage:
+//
+//   llvm-xray [options] <subcommand> [subcommand-specific options]
+//
+#include "xray-registry.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+using namespace llvm::xray;
+
+int main(int argc, char *argv[]) {
+  cl::ParseCommandLineOptions(argc, argv,
+                              "XRay Tools\n\n"
+                              "  This program consolidates multiple XRay trace "
+                              "processing tools for convenient access.\n");
+  for (auto *SC : cl::getRegisteredSubcommands()) {
+    if (*SC) {
+      // If no subcommand was provided, we need to explicitly check if this is
+      // the top-level subcommand.
+      if (SC == &*cl::TopLevelSubCommand) {
+        cl::PrintHelpMessage(false, true);
+        return 0;
+      }
+      if (auto C = dispatch(SC)) {
+        ExitOnError("llvm-xray: ")(C());
+        return 0;
+      }
+    }
+  }
+
+  // If all else fails, we still print the usage message.
+  cl::PrintHelpMessage(false, true);
+  return 0;
+}