Start new design for interceptors and implement String.charCodeAt with it.

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 117 matching lines @@
   ClassElement nullClass;
   ClassElement listClass;
   ClassElement typeClass;
   ClassElement mapClass;
   ClassElement jsInvocationMirrorClass;
   Element assertMethod;
   Element identicalFunction;
   Element functionApplyMethod;
   Element invokeOnMethod;
 
+  ClassElement jsStringClass;

[ahe, 2012/11/09 13:45:29]

Backend specific?

[ngeoffray, 2012/11/13 11:45:16]

Done.

+  ClassElement objectInterceptorClass;

[ahe, 2012/11/09 13:45:29]

Ditto.

[ngeoffray, 2012/11/13 11:45:16]

Done.

+  Element getInterceptorMethod;

[ahe, 2012/11/09 13:45:29]

Ditto.

[ngeoffray, 2012/11/13 11:45:16]

Done.

+
+  bool isForeignClass(Element element) {

[ahe, 2012/11/09 13:45:29]

Ditto.

[ngeoffray, 2012/11/13 11:45:16]

Done.

+    return element == jsStringClass;
+  }
+
   Element get currentElement => _currentElement;
   withCurrentElement(Element element, f()) {
     Element old = currentElement;
     _currentElement = element;
     try {
       return f();
     } on SpannableAssertionFailure catch (ex) {
       if (!hasCrashed) {
         SourceSpan span = spanFromSpannable(ex.node);
         reportDiagnostic(span, ex.message, api.Diagnostic.ERROR);
@@ skipping 288 matching lines @@
     identicalFunction = coreLibrary.find(const SourceString('identical'));
 
     initializeSpecialClasses();
 
     functionClass.ensureResolved(this);
     functionApplyMethod =
         functionClass.lookupLocalMember(const SourceString('apply'));
     jsInvocationMirrorClass.ensureResolved(this);
     invokeOnMethod = jsInvocationMirrorClass.lookupLocalMember(
         const SourceString('invokeOn'));
+
+    jsStringClass = interceptorsLibrary.find(const SourceString('JSString'));
+    objectInterceptorClass =
+        interceptorsLibrary.find(const SourceString('ObjectInterceptor'));
+    getInterceptorMethod =
+        interceptorsLibrary.find(const SourceString('getInterceptor'));
   }
 
   void loadCoreImplLibrary() {
     Uri coreImplUri = new Uri.fromComponents(scheme: 'dart', path: 'coreimpl');
     coreImplLibrary = libraryLoader.loadLibrary(coreImplUri, null, coreImplUri);
   }
 
   void importHelperLibrary(LibraryElement library) {
     if (jsHelperLibrary != null) {
       libraryLoader.importLibrary(library, jsHelperLibrary, null);
@@ skipping 453 matching lines @@
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (condition is Function){
     condition = condition();
   }
   if (spannable == null || !condition) {
     throw new SpannableAssertionFailure(spannable, message);
   }
   return true;
 }