Prevent modification of cached normalized maps....

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
===================================================================
--- test/cctest/test-api.cc	(revision 5515)
+++ test/cctest/test-api.cc	(working copy)
@@ -2937,6 +2937,49 @@
 }
 
 
+THREADED_TEST(NamedInterceptorDictionaryICMultipleContext) {
+  v8::HandleScope scope;
+
+  v8::Persistent<Context> context1 = Context::New();
+
+  context1->Enter();
+  Local<ObjectTemplate> templ = ObjectTemplate::New();
+  templ->SetNamedPropertyHandler(XPropertyGetter);
+  // Create an object with a named interceptor.
+  v8::Local<v8::Object> object = templ->NewInstance();
+  context1->Global()->Set(v8_str("interceptor_obj"), object);
+
+  // Force the object into the slow case.
+  CompileRun("interceptor_obj.y = 0;"
+             "delete interceptor_obj.y;");
+  context1->Exit();
+
+  {
+    // Introduce the object into a different context.
+    // Repeat named loads to exercise ICs.
+    LocalContext context2;
+    context2->Global()->Set(v8_str("interceptor_obj"), object);
+    Local<Value> result =
+      CompileRun("function get_x(o) { return o.x; }"
+                 "interceptor_obj.x = 42;"
+                 "for (var i=0; i != 10; i++) {"
+                 "  get_x(interceptor_obj);"
+                 "}"
+                 "get_x(interceptor_obj)");
+    // Check that the interceptor was actually invoked.
+    CHECK_EQ(result, v8_str("x"));
+  }
+
+  // Return to the original context and force some object to the slow case
+  // to cause the NormalizedMapCache to verify. 
+  context1->Enter();
+  CompileRun("var obj = { x : 0 }; delete obj.x;");
+  context1->Exit();
+
+  context1.Dispose();
+}
+
+
 static v8::Handle<Value> SetXOnPrototypeGetter(Local<String> property,
                                                const AccessorInfo& info) {
   // Set x on the prototype object and do not handle the get request.