Increase Dart based command line analyzer cache size to 512.

pkg/analyzer/lib/src/analyzer_impl.dart

 // Copyright (c) 2013, 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_impl;
 
 import 'dart:io';
 
 import 'package:path/path.dart' as pathos;
 
 import 'generated/java_io.dart';
 import 'generated/engine.dart';
 import 'generated/error.dart';
 import 'generated/source_io.dart';
 import 'generated/sdk.dart';
 import 'generated/sdk_io.dart';
 import 'generated/ast.dart';
 import 'generated/element.dart';
 import '../options.dart';
 
+/**
+ * The maximum number of sources for which AST structures should be kept in the cache.
+ */
+const int _MAX_CACHE_SIZE = 512;
 
 DartSdk sdk;
 
 /// Analyzes single library [File].
 class AnalyzerImpl {
   final CommandLineOptions options;
 
   ContentCache contentCache = new ContentCache();
   SourceFactory sourceFactory;
   AnalysisContext context;
@@ skipping 69 matching lines @@
       if (packageDirectory != null) {
         resolvers.add(new PackageUriResolver([packageDirectory]));
       }
     }
     sourceFactory = new SourceFactory(resolvers);
     context = AnalysisEngine.instance.createAnalysisContext();
     context.sourceFactory = sourceFactory;
 
     // set options for context
     AnalysisOptionsImpl contextOptions = new AnalysisOptionsImpl();
-    contextOptions.cacheSize = 256;
+    contextOptions.cacheSize = _MAX_CACHE_SIZE;
     contextOptions.hint = !options.disableHints;
     context.analysisOptions = contextOptions;
   }
 
   /// Fills [sources].
   void prepareSources(LibraryElement library) {
     var units = new Set<CompilationUnitElement>();
     var libraries = new Set<LibraryElement>();
     addLibrarySources(library, libraries, units);
   }
@@ skipping 79 matching lines @@
         var internalPath = pathos.join(libraryDirectory, '_internal') + pathos.separator;
         if (!filePath.startsWith(internalPath)) {
           return UriKind.DART_URI;
         }
       }
     }
     // some generic file
     return UriKind.FILE_URI;
   }
 }