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 216 matching lines @@
   ClassElement boolClass;
   ClassElement numClass;
   ClassElement intClass;
   ClassElement doubleClass;
   ClassElement stringClass;
   ClassElement functionClass;
   ClassElement nullClass;
   ClassElement listClass;
   ClassElement typeClass;
   ClassElement mapClass;
+  ClassElement deferLoadClass;
+  ClassElement onLibraryLoadedClass;
+
   ClassElement jsInvocationMirrorClass;
   /// Document class from dart:mirrors.
   ClassElement documentClass;
   Element assertMethod;
   Element identicalFunction;
   Element functionApplyMethod;
   Element invokeOnMethod;
   Element createInvocationMirrorElement;
 
   Element get currentElement => _currentElement;
@@ skipping 37 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);
   }
 
   ResolutionUniverse get resolverWorld => enqueuer.resolution.universe;
   CodegenUniverse get codegenWorld => enqueuer.codegen.universe;
 
@@ skipping 61 matching lines @@
       node = currentElement;
     }
     if (node is Node) {
       return spanFromNode(node, uri);
     } else if (node is Token) {
       return spanFromTokens(node, node, uri);
     } else if (node is HInstruction) {
       return spanFromHInstruction(node);
     } else if (node is Element) {
       return spanFromElement(node);
+    } else if (node is MetadataAnnotation) {
+      return spanFromTokens(node.beginToken, node.beginToken);
     } else {
       throw 'No error location.';
     }
   }
 
   void reportFatalError(String reason, Element element,
                         {Node node, Token token, HInstruction instruction}) {
     withCurrentElement(element, () {
       cancel(reason, node: node, token: token, instruction: instruction,
              element: element);
@@ skipping 32 matching lines @@
       withCurrentElement(dynamicClass, () {
         library.addToScope(dynamicClass, this);
       });
     }
   }
 
   LibraryElement scanBuiltinLibrary(String filename);
 
   void initializeSpecialClasses() {
     final List missingCoreClasses = [];
-    ClassElement lookupCoreClass(SourceString name) {
-      ClassElement result = coreLibrary.find(name);
+    ClassElement lookupCoreClass(String name) {
+      ClassElement result = coreLibrary.find(new SourceString(name));
       if (result == null) {
-        missingCoreClasses.add(name.slowToString());
+        missingCoreClasses.add(name);
       }
       return result;
     }
-    objectClass = lookupCoreClass(const SourceString('Object'));
-    boolClass = lookupCoreClass(const SourceString('bool'));
-    numClass = lookupCoreClass(const SourceString('num'));
-    intClass = lookupCoreClass(const SourceString('int'));
-    doubleClass = lookupCoreClass(const SourceString('double'));
-    stringClass = lookupCoreClass(const SourceString('String'));
-    functionClass = lookupCoreClass(const SourceString('Function'));
-    listClass = lookupCoreClass(const SourceString('List'));
-    typeClass = lookupCoreClass(const SourceString('Type'));
-    mapClass = lookupCoreClass(const SourceString('Map'));
+    objectClass = lookupCoreClass('Object');
+    boolClass = lookupCoreClass('bool');
+    numClass = lookupCoreClass('num');
+    intClass = lookupCoreClass('int');
+    doubleClass = lookupCoreClass('double');
+    stringClass = lookupCoreClass('String');
+    functionClass = lookupCoreClass('Function');
+    listClass = lookupCoreClass('List');
+    typeClass = lookupCoreClass('Type');
+    mapClass = lookupCoreClass('Map');
+    deferLoadClass = lookupCoreClass('DeferLoad');
+    onLibraryLoadedClass = lookupCoreClass('OnLibraryLoaded');
     if (!missingCoreClasses.isEmpty) {
       internalErrorOnElement(coreLibrary,
           'dart:core library does not contain required classes: '
           '$missingCoreClasses');
     }
 
     final List missingHelperClasses = [];
-    ClassElement lookupHelperClass(SourceString name) {
-      ClassElement result = jsHelperLibrary.find(name);
+    ClassElement lookupHelperClass(String name) {
+      ClassElement result = jsHelperLibrary.find(new SourceString(name));
       if (result == null) {
-        missingHelperClasses.add(name.slowToString());
+        missingHelperClasses.add(name);
       }
       return result;
     }
-    jsInvocationMirrorClass =
-        lookupHelperClass(const SourceString('JSInvocationMirror'));
-    closureClass = lookupHelperClass(const SourceString('Closure'));
-    dynamicClass = lookupHelperClass(const SourceString('Dynamic_'));
-    nullClass = lookupHelperClass(const SourceString('Null'));
+    jsInvocationMirrorClass = lookupHelperClass('JSInvocationMirror');
+    closureClass = lookupHelperClass('Closure');
+    dynamicClass = lookupHelperClass('Dynamic_');
+    nullClass = lookupHelperClass('Null');
     if (!missingHelperClasses.isEmpty) {
       internalErrorOnElement(jsHelperLibrary,
           'dart:_js_helper library does not contain required classes: '
           '$missingHelperClasses');
     }
 
     types = new Types(this, dynamicClass);
   }
 
   void scanBuiltinLibraries() {
@@ skipping 76 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 470 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');
   }
 }