Snapshot DDC trained on itself

pkg/dev_compiler/lib/src/compiler/code_generator.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.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 15 matching lines @@
 import 'package:analyzer/src/summary/idl.dart' show UnlinkedUnit;
 import 'package:analyzer/src/summary/link.dart' as summary_link;
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/summary/summarize_ast.dart'
     show serializeAstUnlinked;
 import 'package:analyzer/src/summary/summarize_elements.dart'
     show PackageBundleAssembler;
 import 'package:analyzer/src/summary/summary_sdk.dart';
 import 'package:analyzer/src/task/strong/ast_properties.dart'
     show isDynamicInvoke, setIsDynamicInvoke, getImplicitAssignmentCast;
-import 'package:path/path.dart' show relative, separator;
+import 'package:path/path.dart' show isWithin, relative, separator;
 
 import '../closure/closure_annotator.dart' show ClosureAnnotator;
 import '../js_ast/js_ast.dart' as JS;
 import '../js_ast/js_ast.dart' show js;
 import 'ast_builder.dart' show AstBuilder;
 import 'compiler.dart' show BuildUnit, CompilerOptions, JSModuleFile;
 import 'element_helpers.dart';
 import 'extension_types.dart' show ExtensionTypeSet;
 import 'js_interop.dart';
 import 'js_metalet.dart' as JS;
@@ skipping 5978 matching lines @@
     return uri.path;
   }
   // TODO(vsm): This is not necessarily unique if '__' appears in a file name.
   var encodedSeparator = '__';
   String qualifiedPath;
   if (uri.scheme == 'package') {
     // Strip the package name.
     // TODO(vsm): This is not unique if an escaped '/'appears in a filename.
     // E.g., "foo/bar.dart" and "foo$47bar.dart" would collide.
     qualifiedPath = uri.pathSegments.skip(1).join(encodedSeparator);
-  } else if (uri.toFilePath().startsWith(libraryRoot)) {
+  } else if (isWithin(libraryRoot, uri.toFilePath())) {
     qualifiedPath = uri.path
         .substring(libraryRoot.length)
         .replaceAll(separator, encodedSeparator);
   } else {
     // We don't have a unique name.
     throw 'Invalid library root. $libraryRoot does not contain ${uri
         .toFilePath()}';
   }
   return pathToJSIdentifier(qualifiedPath);
 }
 
 /// Debugger friendly name for a Dart Library.
 String jsLibraryDebuggerName(String libraryRoot, LibraryElement library) {
   var uri = library.source.uri;
   // For package: and dart: uris show the entire
   if (uri.scheme == 'dart' || uri.scheme == 'package') return uri.toString();
 
   var filePath = uri.toFilePath();
-  if (!filePath.startsWith(libraryRoot)) {
+  if (!isWithin(libraryRoot, filePath)) {
     throw 'Invalid library root. $libraryRoot does not contain ${uri
         .toFilePath()}';
   }
   // Relative path to the library.
   return relative(filePath, from: libraryRoot);
 }
 
 String jsDebuggingLibraryName(String libraryRoot, LibraryElement library) {
   var uri = library.source.uri;
   if (uri.scheme == 'dart') {
@@ skipping 63 matching lines @@
   if (targetIdentifier.staticElement is! PrefixElement) return false;
   var prefix = targetIdentifier.staticElement as PrefixElement;
 
   // The library the prefix is referring to must come from a deferred import.
   var containingLibrary = resolutionMap
       .elementDeclaredByCompilationUnit(target.root as CompilationUnit)
       .library;
   var imports = containingLibrary.getImportsWithPrefix(prefix);
   return imports.length == 1 && imports[0].isDeferred;
 }