Introduces the new syntax for deferred loading

sdk/lib/_internal/compiler/implementation/ssa/builder.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 ssa;
 
 /**
  * A special element for the extra parameter taken by intercepted
  * methods. We need to implement [TypedElement.type] because our
  * optimizers may look at its declared type.
@@ skipping 2950 matching lines @@
               element.declaration,
               TypeMaskFactory.inferredTypeForElement(element, compiler));
           push(instruction);
         }
       }
     } else if (Elements.isInstanceSend(send, elements)) {
       HInstruction receiver = generateInstanceSendReceiver(send);
       generateInstanceGetterWithCompiledReceiver(
           send, elements.getSelector(send), receiver);
     } else if (Elements.isStaticOrTopLevelFunction(element)) {
-      // TODO(5346): Try to avoid the need for calling [declaration] before
-      // creating an [HStatic].
-      push(new HStatic(element.declaration, backend.nonNullType));
-      // TODO(ahe): This should be registered in codegen.
+      if (element.isDeferredLoaderGetter()) {

[floitsch, 2014/03/19 21:04:51]

Can't you handle this one like all the other foreigns?

element.isForeign should be true and then it should be handled in the
visitForeignSend.

[sigurdm, 2014/03/20 12:26:33]

Other foreigns are only handled as calls (not in a getter context).

I created visitForeignGetter that is called from generateGetter.

+        FunctionElement deferredLoader = element;
+        Element loadFunction = compiler.loadLibraryFunction;
+        PrefixElement prefixElement = deferredLoader.enclosingElement;
+        String loadId =
+            compiler.deferredLoadTask.importDeferName[prefixElement.import];
+        var inputs = [graph.addConstantString(
+            new ast.DartString.literal(loadId), compiler)];
+        push(new HInvokeStatic(loadFunction, inputs, backend.nonNullType,
+                               targetCanThrow: false));
+      } else {
+        // TODO(5346): Try to avoid the need for calling [declaration] before
+        // creating an [HStatic].
+        push(new HStatic(element.declaration, backend.nonNullType));
+        // TODO(ahe): This should be registered in codegen.
+      }
       compiler.enqueuer.codegen.registerGetOfStaticFunction(
           element.declaration);
     } else if (Elements.isErroneousElement(element)) {
       // An erroneous element indicates an unresolved static getter.
       generateThrowNoSuchMethod(send,
                                 getTargetName(element, 'get'),
                                 argumentNodes: const Link<ast.Node>());
     } else {
       stack.add(localsHandler.readLocal(element));
     }
@@ skipping 3131 matching lines @@
     DartType unaliased = type.unalias(builder.compiler);
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     ClassElement cls = builder.compiler.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls)));
   }
 }