Reland "Add --version option to dart2js and add version information (if available) to generated cod…

sdk/lib/_internal/compiler/implementation/compiler.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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 394 matching lines @@
   static const SourceString CALL_OPERATOR_NAME = const SourceString('call');
   static const SourceString NO_SUCH_METHOD = const SourceString('noSuchMethod');
   static const int NO_SUCH_METHOD_ARG_COUNT = 1;
   static const SourceString CREATE_INVOCATION_MIRROR =
       const SourceString('createInvocationMirror');
   static const SourceString INVOKE_ON = const SourceString('_invokeOn');
   static const SourceString RUNTIME_TYPE = const SourceString('runtimeType');
   static const SourceString START_ROOT_ISOLATE =
       const SourceString('startRootIsolate');
 
+  static const String UNDETERMINED_BUILD_ID =
+      "build number could not be determined";
+
   final Selector iteratorSelector =
       new Selector.getter(const SourceString('iterator'), null);
   final Selector currentSelector =
       new Selector.getter(const SourceString('current'), null);
   final Selector moveNextSelector =
       new Selector.call(const SourceString('moveNext'), null, 0);
   final Selector noSuchMethodSelector = new Selector.call(
       Compiler.NO_SUCH_METHOD, null, Compiler.NO_SUCH_METHOD_ARG_COUNT);
   final Selector symbolValidatedConstructorSelector = new Selector.call(
       const SourceString('validated'), null, 1);
@@ skipping 27 matching lines @@
             bool generateSourceMap: true,
             bool disallowUnsafeEval: false,
             this.analyzeAll: false,
             bool analyzeOnly: false,
             bool analyzeSignaturesOnly: false,
             this.rejectDeprecatedFeatures: false,
             this.checkDeprecationInSdk: false,
             this.preserveComments: false,
             this.verbose: false,
             this.sourceMapUri: null,
-            this.buildId: "build number could not be determined",
+            this.buildId: UNDETERMINED_BUILD_ID,
             outputProvider,
             List<String> strips: const []})
       : this.analyzeOnly = analyzeOnly || analyzeSignaturesOnly,
         this.analyzeSignaturesOnly = analyzeSignaturesOnly,
-        this.outputProvider =
-            (outputProvider == null) ? NullSink.outputProvider : outputProvider
-
-  {
+        this.outputProvider = (outputProvider == null)
+            ? NullSink.outputProvider
+            : outputProvider {
     world = new World(this);
 
     closureMapping.ClosureNamer closureNamer;
     if (emitJavaScript) {
       js_backend.JavaScriptBackend jsBackend =
           new js_backend.JavaScriptBackend(this, generateSourceMap,
                                            disallowUnsafeEval);
       closureNamer = jsBackend.namer;
       backend = jsBackend;
     } else {
@@ skipping 20 matching lines @@
       enqueuer = new EnqueueTask(this)];
 
     tasks.addAll(backend.tasks);
     metadataHandler = new ConstantHandler(
         this, backend.constantSystem, isMetadata: true);
   }
 
   Universe get resolverWorld => enqueuer.resolution.universe;
   Universe get codegenWorld => enqueuer.codegen.universe;
 
+  bool get hasBuildId => buildId != UNDETERMINED_BUILD_ID;
+
   int getNextFreeClassId() => nextFreeClassId++;
 
   void ensure(bool condition) {
     if (!condition) cancel('failed assertion in leg');
   }
 
   void unimplemented(String methodName,
                      {Node node, Token token, HInstruction instruction,
                       Element element}) {
     internalError("$methodName not implemented",
@@ skipping 811 matching lines @@
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }