adds array bounds checking

frog/frog_options.dart

 // 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.
 
 /** General options used by the compiler. */
 FrogOptions options;
 
 /** Extracts options from command-line arguments. */
 void parseOptions(String homedir, List<String> args, FileSystem files) {
   assert(options == null);
@@ skipping 21 matching lines @@
   bool enableAsserts = false;
   bool enableTypeChecks = false;
   bool warningsAsErrors = false;
   bool verifyImplements = false; // TODO(jimhug): Implement
   bool compileAll = false;
   bool forceDynamic = false;
   bool dietParse = false;
   bool compileOnly = false;
   bool inferTypes = false;
 
+  // Specifies non-compliant behavior where array bounds checks are
+  // not implemented in generated code.
+  bool disableBoundsChecks = false;
+
   // Message support
   bool throwOnErrors = false;
   bool throwOnWarnings = false;
   bool throwOnFatal = false;
   bool showInfo = false;
   bool showWarnings = true;
   bool useColors = true;
 
   // Not currently settable via command line.
   // Intended for use by compiler implementer during debugging.
@@ skipping 91 matching lines @@
           break;
 
         case '--no_colors':
           useColors = false;
           break;
 
         case '--Xinfer_types':
           inferTypes = true;
           break;
 
+        case '--checked':
+          enableTypeChecks = true;
+          enableAsserts = true;
+          break;
+
+        case '--unchecked':
+          disableBoundsChecks = true;
+          break;
+
         default:
           if (arg.endsWith('.dart')) {
             dartScript = arg;
             childArgs = args.getRange(i + 1, args.length - i - 1);
             break loop;
           } else if (arg.startsWith('--out=')) {
             outfile = arg.substring('--out='.length);
           } else if (arg.startsWith('--libdir=')) {
             libDir = arg.substring('--libdir='.length);
             passedLibDir = true;
@@ skipping 10 matching lines @@
       // Try locally
       var temp = 'frog/lib';
       if (files.fileExists(temp)) {
         libDir = temp;
       } else {
         libDir = 'lib';
       }
     }
   }
 }