llvm/tools/llvm-xray/llvm-xray.cpp

   1 //===- llvm-xray.cpp: XRay Tool Main Program ------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the main entry point for the suite of XRay tools. All
  10 // additional functionality are implemented as subcommands.
  11 //
  12 //===----------------------------------------------------------------------===//
  13 //
  14 // Basic usage:
  15 //
  16 //   llvm-xray [options] <subcommand> [subcommand-specific options]
  17 //
  18 #include "xray-registry.h"
  19 #include "llvm/Support/CommandLine.h"
  20 #include "llvm/Support/raw_ostream.h"
  21
  22 using namespace llvm;
  23 using namespace llvm::xray;
  24
  25 int main(int argc, char *argv[]) {
  26   cl::ParseCommandLineOptions(argc, argv,
  27                               "XRay Tools\n\n"
  28                               "  This program consolidates multiple XRay trace "
  29                               "processing tools for convenient access.\n");
  30   for (auto *SC : cl::getRegisteredSubcommands()) {
  31     if (*SC) {
  32       // If no subcommand was provided, we need to explicitly check if this is
  33       // the top-level subcommand.
  34       if (SC == &cl::SubCommand::getTopLevel()) {
  35         cl::PrintHelpMessage(false, true);
  36         return 0;
  37       }
  38       if (auto C = dispatch(SC)) {
  39         ExitOnError("llvm-xray: ")(C());
  40         return 0;
  41       }
  42     }
  43   }
  44
  45   // If all else fails, we still print the usage message.
  46   cl::PrintHelpMessage(false, true);
  47   return 0;
  48 }