Deferred (aka lazy) loading of static functions.

dart/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 289 matching lines @@
   TreeValidatorTask validator;
   ResolverTask resolver;
   closureMapping.ClosureTask closureToClassMapper;
   TypeCheckerTask checker;
   ti.TypesTask typesTask;
   Backend backend;
   ConstantHandler constantHandler;
   ConstantHandler metadataHandler;
   EnqueueTask enqueuer;
   CompilerTask fileReadingTask;
+  DeferredLoadTask deferredLoadTask;
 
   static const SourceString MAIN = const SourceString('main');
   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 =
@@ skipping 58 matching lines @@
       libraryLoader = new LibraryLoaderTask(this),
       scanner = new ScannerTask(this),
       dietParser = new DietParserTask(this),
       parser = new ParserTask(this),
       patchParser = new PatchParserTask(this),
       resolver = new ResolverTask(this),
       closureToClassMapper = new closureMapping.ClosureTask(this, closureNamer),
       checker = new TypeCheckerTask(this),
       typesTask = new ti.TypesTask(this),
       constantHandler = new ConstantHandler(this, backend.constantSystem),
+      deferredLoadTask = new DeferredLoadTask(this),
       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;
 
@@ skipping 248 matching lines @@
           reportFatalError('main is not a function', main);
         }
         FunctionElement mainMethod = main;
         FunctionSignature parameters = mainMethod.computeSignature(this);
         parameters.forEachParameter((Element parameter) {
           reportFatalError('main cannot have parameters', parameter);
         });
       }
     }
 
+    deferredLoadTask.registerMainApp(mainApp);
+
     log('Resolving...');
     phase = PHASE_RESOLVING;
     if (analyzeAll) {
       libraries.forEach((_, lib) => fullyEnqueueLibrary(lib));
     }
     backend.enqueueHelpers(enqueuer.resolution);
     processQueue(enqueuer.resolution, main);
     enqueuer.resolution.logSummary(log);
 
     if (compilationFailed) return;
@@ skipping 369 matching lines @@
 
 class CompilerTask {
   final Compiler compiler;
   final Stopwatch watch;
 
   CompilerTask(this.compiler) : watch = new Stopwatch();
 
   String get name => 'Unknown task';
   int get timing => watch.elapsedMilliseconds;
 
-  measure(Function action) {
+  measure(action()) {
     CompilerTask previous = compiler.measuredTask;
     if (identical(this, previous)) return action();
     compiler.measuredTask = this;
     if (previous != null) previous.watch.stop();
     watch.start();
     try {
       return action();
     } finally {
       watch.stop();
       if (previous != null) previous.watch.start();
       compiler.measuredTask = previous;
     }
   }
+
+  measureElement(Element element, action()) {
+    compiler.withCurrentElement(element, () => measure(action));
+  }
 }
 
 class CompilerCancelledException implements Exception {
   final String reason;
   CompilerCancelledException(this.reason);
 
   String toString() {
     String banner = 'compiler cancelled';
     return (reason != null) ? '$banner: $reason' : '$banner';
   }
@@ skipping 71 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');
   }
 }