Compile only functions that have changed.

dart/site/try/poi/poi.dart

 // Copyright (c) 2014, 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 trydart.poi;
 
 import 'dart:async' show
     Completer,
     Future;
 
@@ skipping 42 matching lines @@
     DartType;
 
 import 'package:compiler/implementation/scanner/scannerlib.dart' show
     EOF_TOKEN,
     IDENTIFIER_TOKEN,
     KEYWORD_TOKEN,
     PartialClassElement,
     PartialElement,
     Token;
 
+import 'package:compiler/implementation/js/js.dart' show
+    prettyPrint;
+
 /// Enabled by the option --enable-dart-mind.  Controls if this program should
 /// be querying Dart Mind.
 bool isDartMindEnabled = false;
 
 /// Iterator over lines from standard input (or the argument array).
 Iterator<String> stdin;
 
 /// Enabled by the option --simulate-mutation. When true, this program will
 /// only prompt for one file name, and subsequent runs will read
 /// FILENAME.N.dart, where N starts at 1, and is increased on each iteration.
@@ skipping 344 matching lines @@
     poiTask = new PoiTask(cachedCompiler);
     cachedCompiler.tasks.add(poiTask);
   }
 
   if (!isFullCompile) {
     printFormattedTime(
         'Analyzing changes and updating elements took', sw.elapsedMicroseconds);
   }
   sw.reset();
 
-  Future<bool> compilation = cachedCompiler.run(updater.uri);
+  Future<bool> compilation;
+
+  if (updater.hasPendingUpdates) {
+    List<Element> updatedElements = updater.applyUpdates();
+    compilation = new Future(() {
+      cachedCompiler.progress.reset();
+      for (Element element in updatedElements) {
+        cachedCompiler.enqueuer.resolution.addToWorkList(element);
+      }
+      cachedCompiler.processQueue(cachedCompiler.enqueuer.resolution, null);
+
+      cachedCompiler.phase = Compiler.PHASE_DONE_RESOLVING;
+
+      for (Element element in updatedElements) {
+        cachedCompiler.enqueuer.codegen.addToWorkList(element);
+      }
+      cachedCompiler.processQueue(cachedCompiler.enqueuer.codegen, null);
+
+      for (Element element in updatedElements) {
+        var node = cachedCompiler.enqueuer.codegen.generatedCode[element];
+        print(prettyPrint(node, cachedCompiler).getText());
+      }
+
+      return !cachedCompiler.compilationFailed;
+    });
+  } else {
+    compilation = cachedCompiler.run(updater.uri);
+  }
 
   return compilation.then((success) {
     printVerbose('Compiler queue processed in ${sw.elapsedMicroseconds}us');
     if (isVerbose) {
       for (final task in cachedCompiler.tasks) {
         int time = task.timingMicroseconds;
         if (time != 0) {
           printFormattedTime('${task.name} took', time);
         }
       }
@@ skipping 319 matching lines @@
 
 modelx.ImportScope importScope(modelx.LibraryElementX element) {
   return element.importScope;
 }
 
 class PoiTask extends CompilerTask {
   PoiTask(Compiler compiler) : super(compiler);
 
   String get name => 'POI';
 }