Interpose an Expando cache on reflectClass().

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
===================================================================
--- runtime/lib/mirrors_impl.dart	(revision 25169)
+++ runtime/lib/mirrors_impl.dart	(working copy)
@@ -1120,7 +1120,14 @@
   static ClassMirror makeLocalClassMirror(Type key)
       native "Mirrors_makeLocalClassMirror";
 
+  static Expando<ClassMirror> classMirrorCache = new Expando();

[Ivan Posva, 2013/07/18 20:41:46]

If you don't mind, can you please give this Expando a name? Will make it easier
to identify.

[rmacnak, 2013/07/18 20:49:29]

Done.

   static ClassMirror reflectClass(Type key) {
-    return makeLocalClassMirror(key);
+    var classMirror = classMirrorCache[key];
+    if (classMirror != null) {

[Ivan Posva, 2013/07/18 20:41:46]

How about avoiding duplicate returns:

if (classMirror == null) {
  classMirror = makeLocalClassMirror(key);
  classMirrorCache[key] = classMirror;
}
return classMirror;

[rmacnak, 2013/07/18 20:49:29]

Done.

+      return classMirror;
+    }
+    classMirror = makeLocalClassMirror(key);
+    classMirrorCache[key] = classMirror;
+    return classMirror;
   }
 }