Generate tear-off closures dynamically.

dart/sdk/lib/_internal/compiler/implementation/js_backend/backend.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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 793 matching lines @@
       } else if (cls == compiler.boundClosureClass) {
         // TODO(ngeoffray): Move the bound closure class in the
         // backend.
         enqueueClass(enqueuer, compiler.boundClosureClass, elements);
       } else if (Elements.isNativeOrExtendsNative(cls)) {
         enqueue(enqueuer, getNativeInterceptorMethod, elements);
         enqueueClass(enqueuer, jsInterceptorClass, compiler.globalDependencies);
         enqueueClass(enqueuer, jsPlainJavaScriptObjectClass, elements);
       }
     }
+    if (cls == compiler.closureClass) {
+      enqueue(enqueuer,
+              compiler.findHelper('closureFromTearOff'),
+              elements);
+    }
     ClassElement result = null;
     if (cls == compiler.stringClass || cls == jsStringClass) {
       addInterceptors(jsStringClass, enqueuer, elements);
     } else if (cls == compiler.listClass
                || cls == jsArrayClass
                || cls == jsFixedArrayClass
                || cls == jsExtendableArrayClass) {
       addInterceptors(jsArrayClass, enqueuer, elements);
       addInterceptors(jsMutableArrayClass, enqueuer, elements);
       addInterceptors(jsFixedArrayClass, enqueuer, elements);
@@ skipping 160 matching lines @@
   void registerTypeVariableExpression(TreeElements elements) {
     enqueueInResolution(getSetRuntimeTypeInfo(), elements);
     enqueueInResolution(getGetRuntimeTypeInfo(), elements);
     registerGetRuntimeTypeArgument(elements);
     enqueueClass(compiler.enqueuer.resolution, compiler.listClass, elements);
     enqueueInResolution(getRuntimeTypeToString(), elements);
     enqueueInResolution(getCreateRuntimeType(), elements);
   }
 
   void registerIsCheck(DartType type, Enqueuer world, TreeElements elements) {
+    enqueueInResolution(getThrowRuntimeError(), elements);
     type = type.unalias(compiler);
     enqueueClass(world, compiler.boolClass, elements);
     bool inCheckedMode = compiler.enableTypeAssertions;
     // [registerIsCheck] is also called for checked mode checks, so we
     // need to register checked mode helpers.
     if (inCheckedMode) {
       if (!world.isResolutionQueue) {
         // All helpers are added to resolution queue in enqueueHelpers. These
         // calls to enqueueInResolution serve as assertions that the helper was
         // in fact added.
@@ skipping 37 matching lines @@
       // We will neeed to add the "$is" and "$as" properties on the
       // JavaScript object prototype, so we make sure
       // [:defineProperty:] is compiled.
       enqueue(world,
               compiler.findHelper('defineProperty'),
               elements);
     }
   }
 
   void registerAsCheck(DartType type, Enqueuer world, TreeElements elements) {
+    enqueueInResolution(getThrowRuntimeError(), elements);
     type = type.unalias(compiler);
     if (!world.isResolutionQueue) {
       // All helpers are added to resolution queue in enqueueHelpers. These
       // calls to enqueueInResolution serve as assertions that the helper was in
       // fact added.
       // TODO(13155): Find a way to enqueue helpers lazily.
       CheckedModeHelper helper = getCheckedModeHelper(type, typeCast: true);
       enqueueInResolution(helper.getElement(compiler), elements);
       // We also need the native variant of the check (for DOM types).
       helper = getNativeCheckedModeHelper(type, typeCast: true);
@@ skipping 664 matching lines @@
   /**
    * Returns `true` if [element] can be accessed through reflection, that is,
    * is in the set of elements covered by a `MirrorsUsed` annotation.
    *
    * This property is used to tag emitted elements with a marker which is
    * checked by the runtime system to throw an exception if an element is
    * accessed (invoked, get, set) that is not accessible for the reflective
    * system.
    */
   bool isAccessibleByReflection(Element element) {
+    // TODO(ahe): This isn't sufficient: simply importing dart:mirrors
+    // causes hasInsufficientMirrorsUsed to become true.
     if (hasInsufficientMirrorsUsed) return true;
     return isNeededForReflection(element);
   }
 
   /**
    * Returns `true` if the emitter must emit the element even though there
    * is no direct use in the program, but because the reflective system may
    * need to access it.
    */
   bool isNeededForReflection(Element element) {
@@ skipping 210 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }