Prototype re-compiling methods in dart2js

lib/compiler/implementation/world.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.
 
 class World {
   final Map<ClassElement, Set<ClassElement>> subtypes;
+  final Map<ClassElement, Set<SourceString>> setters;
 
-  World() : subtypes = new Map<ClassElement, Set<ClassElement>>();
+  World() : subtypes = new Map<ClassElement, Set<ClassElement>>(),
+            setters = new Map<ClassElement, Set<SourceString>>();
 
   void populate(Compiler compiler, Collection<LibraryElement> libraries) {
     void addSubtypes(ClassElement cls) {
       for (Type type in cls.allSupertypes) {
         Set<Element> subtypesOfCls = subtypes.putIfAbsent(
           type.element,
           () => new Set<ClassElement>());
         subtypesOfCls.add(cls);
       }
     }
@@ skipping 43 matching lines @@
     memberSet.elements.forEach((Element element) {
       if (element.isField()) {
         field = element;
         fieldCount++;
       } else {
         nonFieldCount++;
       }
     });
     return (fieldCount == 1 && nonFieldCount == 0) ? field : null;
   }
+
+  void setterUsed(Type type, SourceString member) {
+    Set<SourceString> setters =

[Mads Ager (google), 2012/06/07 07:56:21]

I find the name clash cofusing here. Call this settersForClass or something like
that? 

[Søren Gjesse, 2012/06/07 08:06:12]

Done.

+        setters.putIfAbsent(type.element, () => new Set<SourceString>());
+    setters.add(member);
+  }
+
+  bool isSetterUsed(Type type, SourceString member) {
+    Set<SourceString> setters = setters[type.element];

[Mads Ager (google), 2012/06/07 07:56:21]

Ditto.

[Søren Gjesse, 2012/06/07 08:06:12]

Done.

+    if (setters === null) return false;
+    return setters.contains(member);
+  }
 }
 
 /**
  * A [MemberSet] contains all the possible targets for a selector.
  */
 class MemberSet {
   final Set<Element> elements;
   final SourceString name;
 
   MemberSet(SourceString this.name) : elements = new Set<Element>();
 
   void add(Element element) {
     elements.add(element);
   }
 
   bool isEmpty() => elements.isEmpty();
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.add("MemberSet: {");
+    elements.every((Element element) => sb.add("${element.name}, "));
+    sb.add("}");
+    return sb.toString();
+  }
 }