Implement is-checks for static functions.

sdk/lib/_internal/compiler/implementation/js_backend/emitter.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 js_backend;
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
@@ skipping 1226 matching lines @@
 
   void emitFinishClassesInvocationIfNecessary(CodeBuffer buffer) {
     if (needsDefineClass) {
       buffer.add("$finishClassesName($classesCollector)$N");
       // Reset the map.
       buffer.add("$classesCollector$_=$_{}$N");
     }
   }
 
   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)) {
     generatedCode.forEach((Element element, CodeBuffer functionBuffer) {
       if (!element.isInstanceMember() && !element.isField()) {
         emitStaticFunctionWithNamer(
             buffer, element, functionBuffer,functionNamer);
       }
     });
   }
@@ skipping 755 matching lines @@
 """;
 const String HOOKS_API_USAGE = """
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;