Merged r18754 into 3.22 branch.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1920 matching lines @@
   templ->PrototypeTemplate()->SetAccessor(name, getter, setter);
 }
 
 void AddInterceptor(Handle<FunctionTemplate> templ,
                     v8::NamedPropertyGetterCallback getter,
                     v8::NamedPropertySetterCallback setter) {
   templ->InstanceTemplate()->SetNamedPropertyHandler(getter, setter);
 }
 
 
+THREADED_TEST(EmptyInterceptorBreakTransitions) {
+  v8::HandleScope scope(CcTest::isolate());
+  Handle<FunctionTemplate> templ = FunctionTemplate::New();
+  AddInterceptor(templ, EmptyInterceptorGetter, EmptyInterceptorSetter);
+  LocalContext env;
+  env->Global()->Set(v8_str("Constructor"), templ->GetFunction());
+  CompileRun("var o1 = new Constructor;"
+             "o1.a = 1;"  // Ensure a and x share the descriptor array.
+             "Object.defineProperty(o1, 'x', {value: 10});");
+  CompileRun("var o2 = new Constructor;"
+             "o2.a = 1;"
+             "Object.defineProperty(o2, 'x', {value: 10});");
+}
+
+
 THREADED_TEST(EmptyInterceptorDoesNotShadowAccessors) {
   v8::HandleScope scope(CcTest::isolate());
   Handle<FunctionTemplate> parent = FunctionTemplate::New();
   Handle<FunctionTemplate> child = FunctionTemplate::New();
   child->Inherit(parent);
   AddAccessor(parent, v8_str("age"),
               SimpleAccessorGetter, SimpleAccessorSetter);
   AddInterceptor(child, EmptyInterceptorGetter, EmptyInterceptorSetter);
   LocalContext env;
   env->Global()->Set(v8_str("Child"), child->GetFunction());
@@ skipping 18760 matching lines @@
   }
   for (int i = 0; i < runs; i++) {
     Local<String> expected;
     if (i != 0) {
       CHECK_EQ(v8_str("escape value"), values[i]);
     } else {
       CHECK(values[i].IsEmpty());
     }
   }
 }