Add an analysis option to disable cache flushing.

pkg/analyzer_cli/lib/src/options.dart

 // Copyright (c) 2015, 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.
 
 library analyzer_cli.src.options;
 
 import 'dart:io';
 
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:args/args.dart';
@@ skipping 56 matching lines @@
 
   /// The path to the dart SDK.
   String dartSdkPath;
 
   /// The path to the dart SDK summary file.
   String dartSdkSummaryPath;
 
   /// A table mapping the names of defined variables to their values.
   final Map<String, String> definedVariables;
 
+  /// Whether to disable cache flushing.  This option can improve analysis
+  /// speed at the expense of memory usage.  It may also be useful for working
+  /// around bugs.
+  final bool disableCacheFlushing;
+
   /// Whether to report hints
   final bool disableHints;
 
   /// Whether to display version information
   final bool displayVersion;
 
   /// A flag indicating whether access to field formal parameters should be
   /// allowed in a constructor's initializer list.
   final bool enableInitializingFormalAccess;
 
@@ skipping 77 matching lines @@
         buildSummaryOnlyDiet = args['build-summary-only-diet'],
         buildSummaryExcludeInformative =
             args['build-summary-exclude-informative'],
         buildSummaryOutput = args['build-summary-output'],
         buildSummaryOutputSemantic = args['build-summary-output-semantic'],
         buildSuppressExitCode = args['build-suppress-exit-code'],
         dartSdkPath = args['dart-sdk'],
         dartSdkSummaryPath = args['dart-sdk-summary'],
         definedVariables = definedVariables,
         analysisOptionsFile = args['options'],
+        disableCacheFlushing = args['disable-cache-flushing'],
         disableHints = args['no-hints'],
         displayVersion = args['version'],
         enableInitializingFormalAccess = args['initializing-formal-access'],
         enableNullAwareOperators = args['enable-null-aware-operators'],
         enableStrictCallChecks = args['enable-strict-call-checks'],
         enableSuperMixins = args['supermixin'],
         enableTypeChecks = args['enable_type_checks'],
         hintsAreFatal = args['fatal-hints'],
         ignoreUnrecognizedFlags = args['ignore-unrecognized-flags'],
         lints = args['lints'],
@@ skipping 123 matching lines @@
       ..addFlag('version',
           help: 'Print the analyzer version.',
           defaultsTo: false,
           negatable: false)
       ..addFlag('lints',
           help: 'Show lint results.', defaultsTo: false, negatable: false)
       ..addFlag('no-hints',
           help: 'Do not show hint results.',
           defaultsTo: false,
           negatable: false)
+      ..addFlag('disable-cache-flushing', defaultsTo: false, hide: true)
       ..addFlag('ignore-unrecognized-flags',
           help: 'Ignore unrecognized command line flags.',
           defaultsTo: false,
           negatable: false)
       ..addFlag('fatal-hints',
           help: 'Treat hints as fatal.', defaultsTo: false, negatable: false)
       ..addFlag('fatal-warnings',
           help: 'Treat non-type warnings as fatal.',
           defaultsTo: false,
           negatable: false)
@@ skipping 367 matching lines @@
 
   int _getNextFlagIndex(args, i) {
     for (; i < args.length; ++i) {
       if (args[i].startsWith('--')) {
         return i;
       }
     }
     return i;
   }
 }