Implement is-checks for static functions.

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

Index: sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index 1d66cb51ee67accab7f1975e5b3c9ce5f2ca86a4..8c1777f9dd1fa86fdda0a2c650d0c76fe69d9c1b 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -1244,14 +1244,25 @@ $lazyInitializerLogic
   }
 
   void emitStaticFunctionWithNamer(CodeBuffer buffer,
-                                   Element element,
+                                   FunctionElement element,
                                    CodeBuffer functionBuffer,
                                    String functionNamer(Element element)) {
     String functionName = functionNamer(element);
     buffer.add('$isolateProperties.$functionName$_=$_');
     buffer.add(functionBuffer);
     buffer.add('$N$n');
+    for (TypedefElement typedef in checkedTypedefs) {

[ngeoffray, 2012/12/13 12:38:57]

This will add is checks to all static functions. You only need them for static
functions that are closurized. So this code should be in
Emitter::emitStaticFunctionGetters.

[karlklose, 2012/12/13 13:08:46]

Done.

+      FunctionType typedefType =
+          typedef.computeType(compiler).unalias(compiler);
+      if (compiler.types.isSubtype(element.computeType(compiler),
+                                   typedefType)) {
+        String typedefName = namer.getName(typedef);
+        buffer.add('$isolateProperties.$functionName'
+                   '.is\$$typedefName$_=${_}true$N');
+      }
+    }
   }
+
   void emitStaticFunctionsWithNamer(CodeBuffer buffer,
                                     Map<Element, CodeBuffer> generatedCode,
                                     String functionNamer(Element element)) {