Implement "one-shot" interceptors.

sdk/lib/_internal/compiler/implementation/js_backend/namer.dart

 // Copyright (c) 2011, 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;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 10 matching lines @@
   final String CURRENT_ISOLATE = r'$';
 
   /**
    * Map from top-level or static elements to their unique identifiers provided
    * by [getName].
    *
    * Invariant: Keys must be declaration elements.
    */
   final Compiler compiler;
   final Map<Element, String> globals;
+  final Map<Selector, String> oneShotInterceptorNames;

[kasperl, 2013/01/24 09:03:51]

If you used a SelectorMap in the emitter, it might make sense to store the names
there? Not quite sure. It feels a little bit weird that we need to mappings for
the one shot interceptors.

[ngeoffray, 2013/01/24 10:41:30]

As discussed, let's keep it here for now to make it consistent of how codegen
and emitter use the namer, and think about removing state in the namer.

   final Map<String, LibraryElement> shortPrivateNameOwners;
   final Set<String> usedGlobalNames;
   final Set<String> usedInstanceNames;
   final Map<String, String> globalNameMap;
   final Map<String, String> instanceNameMap;
   final Map<String, int> popularNameCounters;
 
   /**
    * A cache of names used for bailout methods. We make sure two
    * bailout methods cannot have the same name because if the two
    * bailout methods are in a class and a subclass, we would
    * call the wrong bailout method at runtime. To make it
    * simple, we don't keep track of inheritance and always avoid
    * similar names.
    */
   final Set<String> usedBailoutInstanceNames;
   final Map<Element, String> bailoutNames;
 
   final Map<Constant, String> constantNames;
 
   Namer(this.compiler)
       : globals = new Map<Element, String>(),
+        oneShotInterceptorNames = new Map<Selector, String>(),
         shortPrivateNameOwners = new Map<String, LibraryElement>(),
         bailoutNames = new Map<Element, String>(),
         usedBailoutInstanceNames = new Set<String>(),
         usedGlobalNames = new Set<String>(),
         usedInstanceNames = new Set<String>(),
         instanceNameMap = new Map<String, String>(),
         globalNameMap = new Map<String, String>(),
         constantNames = new Map<Constant, String>(),
         popularNameCounters = new Map<String, int>();
 
@@ skipping 275 matching lines @@
         name = element.name.slowToString();
       }
     } else if (element.isLibrary()) {
       name = LIBRARY_PREFIX;
     } else {
       name = element.name.slowToString();
     }
     return name;
   }
 
-  String getSpecializedName(Element element, Collection<ClassElement> classes) {
+  String getInterceptorName(Element element, Collection<ClassElement> classes) {
+    if (classes.contains(compiler.objectClass)) {
+      // If the object class is in the set of intercepted classes, we
+      // need to go through the generic getInterceptorMethod.
+      return getName(element);
+    }
     // This gets the minified name, but it doesn't really make much difference.
     // The important thing is that it is a unique name.
     StringBuffer buffer = new StringBuffer('${getName(element)}\$');
     for (ClassElement cls in classes) {
       buffer.add(getName(cls));
     }
     return getMappedGlobalName(buffer.toString());
   }
 
   String getBailoutName(Element element) {
@@ skipping 110 matching lines @@
     return 'is\$${getName(element)}';
   }
 
   String safeName(String name) {
     if (jsReserved.contains(name) || name.startsWith('\$')) {
       name = "\$$name";
       assert(!jsReserved.contains(name));
     }
     return name;
   }
+
+  String oneShotInterceptorName(Selector selector) {
+    // TODO(ngeoffray): What to do about typed selectors? We could
+    // filter them out, or keep them and hope the generated one shot
+    // interceptor takes advantage of the type.
+    String cached = oneShotInterceptorNames[selector];
+    if (cached != null) return cached;
+    SourceString name = Elements.operatorNameToIdentifier(selector.name);
+    String result = getFreshName(name.slowToString(), usedGlobalNames);
+    oneShotInterceptorNames[selector] = result;
+    return result;
+  }
 }