Adjust help message.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 945 matching lines @@
 "--observe[=<port>[/<bind-address>]]\n"
 "  The observe flag is a convenience flag used to run a program with a\n"
 "  set of options which are often useful for debugging under Observatory.\n"
 "  These options are currently:\n"
 "      --enable-vm-service[=<port>[/<bind-address>]]\n"
 "      --pause-isolates-on-exit\n"
 "      --pause-isolates-on-unhandled-exceptions\n"
 "      --warn-on-pause-with-no-debugger\n"
 "  This set is subject to change.\n"
 "  Please see these options (--help --verbose) for further documentation.\n"
+"--snapshot-kind=<snapsot_kind>\n"
+"--snapshot=<file_name>\n"
+"  These snapshot options are used to generate a snapshot of the loaded\n"
+"  Dart script:\n"
+"    <snapshot-kind> controls the kind of snapshot, it could be\n"
+"                    script(default), app-aot or app-jit\n"
+"    <file_name> specifies the file into which the snapshot is written\n"
 "--version\n"
 "  Print the VM version.\n");
   } else {
     Log::PrintErr(
 "Supported options:\n"
 "--checked or -c\n"
 "  Insert runtime type checks and enable assertions (checked mode).\n"
 "--help or -h\n"
 "  Display this message (add -v or --verbose for information about\n"
 "  all VM options).\n"
 "--package-root=<path> or -p<path>\n"
 "  Where to find packages, that is, \"package:...\" imports.\n"
 "--packages=<path>\n"
 "  Where to find a package spec file.\n"
 "--observe[=<port>[/<bind-address>]]\n"
 "  The observe flag is a convenience flag used to run a program with a\n"
 "  set of options which are often useful for debugging under Observatory.\n"
 "  These options are currently:\n"
 "      --enable-vm-service[=<port>[/<bind-address>]]\n"
 "      --pause-isolates-on-exit\n"
 "      --pause-isolates-on-unhandled-exceptions\n"
 "      --warn-on-pause-with-no-debugger\n"
 "  This set is subject to change.\n"
 "  Please see these options for further documentation.\n"
+"--snapshot-kind=<snapsot_kind>\n"
+"--snapshot=<file_name>\n"
+"  These snapshot options are used to generate a snapshot of the loaded\n"
+"  Dart script:\n"
+"    <snapshot-kind> controls the kind of snapshot, it could be\n"
+"                    script(default), app-aot or app-jit\n"
+"    <file_name> specifies the file into which the snapshot is written\n"
 "--version\n"
 "  Print the VM version.\n"
 "\n"
-"--snapshot=<file_name>\n"
-"  loads Dart script and generates a snapshot in the specified file\n"
-"\n"
 "--trace-loading\n"
 "  enables tracing of library and script loading\n"
 "\n"
 "--enable-vm-service[=<port>[/<bind-address>]]\n"
 "  enables the VM service and listens on specified port for connections\n"
 "  (default port number is 8181, default bind address is 127.0.0.1).\n"
 #if !defined(TARGET_OS_MACOS)
 "\n"
 "--root-certs-file=<path>\n"
 "  The path to a file containing the trusted root certificates to use for\n"
@@ skipping 948 matching lines @@
   Platform::Exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }