Make proxies work as prototypes.

Fix a couple of other proxy bugs along the way.
Refactor trap invocation in native code.

R=kmillikin@chromium.org
BUG=v8:1543
TEST=

Review URL: http://codereview.chromium.org/7799026

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9312 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ic.cc

@@ -1351,7 +1351,7 @@ static bool StoreICableLookup(LookupResult* lookup) {
 }
 
 
-static bool LookupForWrite(JSReceiver* receiver,
+static bool LookupForWrite(JSObject* receiver,
                            String* name,
                            LookupResult* lookup) {
   receiver->LocalLookup(name, lookup);
@@ -1359,13 +1359,11 @@ static bool LookupForWrite(JSReceiver* receiver,
     return false;
   }
 
-  if (lookup->type() == INTERCEPTOR) {
-    JSObject* object = JSObject::cast(receiver);
-    if (object->GetNamedInterceptor()->setter()->IsUndefined()) {
-      object->LocalLookupRealNamedProperty(name, lookup);
+  if (lookup->type() == INTERCEPTOR &&
+      receiver->GetNamedInterceptor()->setter()->IsUndefined()) {
+    receiver->LocalLookupRealNamedProperty(name, lookup);
     return StoreICableLookup(lookup);
   }
-  }
 
   return true;
 }
@@ -1376,28 +1374,28 @@ MaybeObject* StoreIC::Store(State state,
                             Handle<Object> object,
                             Handle<String> name,
                             Handle<Object> value) {
+  if (!object->IsJSObject()) {
+    // Handle proxies.
+    if (object->IsJSProxy()) {
+      return JSProxy::cast(*object)->
+          SetProperty(*name, *value, NONE, strict_mode);
+    }
+
     // If the object is undefined or null it's illegal to try to set any
     // properties on it; throw a TypeError in that case.
     if (object->IsUndefined() || object->IsNull()) {
       return TypeError("non_object_property_store", object, name);
     }
 
-  if (!object->IsJSReceiver()) {
     // The length property of string values is read-only. Throw in strict mode.
     if (strict_mode == kStrictMode && object->IsString() &&
         name->Equals(isolate()->heap()->length_symbol())) {
       return TypeError("strict_read_only_property", object, name);
     }
-    // Ignore stores where the receiver is not a JSObject.
+    // Ignore other stores where the receiver is not a JSObject.
     return *value;
   }
 
-  // Handle proxies.
-  if (object->IsJSProxy()) {
-    return JSReceiver::cast(*object)->
-        SetProperty(*name, *value, NONE, strict_mode);
-  }
-
   Handle<JSObject> receiver = Handle<JSObject>::cast(object);
 
   // Check if the given name is an array index.

src/objects.cc

@@ -132,27 +132,20 @@ Object* Object::ToBoolean() {
 
 void Object::Lookup(String* name, LookupResult* result) {
   Object* holder = NULL;
-  if (IsSmi()) {
-    Context* global_context = Isolate::Current()->context()->global_context();
-    holder = global_context->number_function()->instance_prototype();
+  if (IsJSReceiver()) {
+    holder = this;
   } else {
-    HeapObject* heap_object = HeapObject::cast(this);
-    if (heap_object->IsJSObject()) {
-      return JSObject::cast(this)->Lookup(name, result);
-    } else if (heap_object->IsJSProxy()) {
-      return result->HandlerResult();
-    }
     Context* global_context = Isolate::Current()->context()->global_context();
-    if (heap_object->IsString()) {
-      holder = global_context->string_function()->instance_prototype();
-    } else if (heap_object->IsHeapNumber()) {
+    if (IsNumber()) {
       holder = global_context->number_function()->instance_prototype();
-    } else if (heap_object->IsBoolean()) {
+    } else if (IsString()) {
+      holder = global_context->string_function()->instance_prototype();
+    } else if (IsBoolean()) {
       holder = global_context->boolean_function()->instance_prototype();
     }
   }
   ASSERT(holder != NULL);  // Cannot handle null or undefined.
-  JSObject::cast(holder)->Lookup(name, result);
+  JSReceiver::cast(holder)->Lookup(name, result);
 }
 
 
@@ -225,30 +218,17 @@ MaybeObject* Object::GetPropertyWithCallback(Object* receiver,
 }
 
 
-MaybeObject* Object::GetPropertyWithHandler(Object* receiver_raw,
-                                            String* name_raw,
-                                            Object* handler_raw) {
-  Isolate* isolate = name_raw->GetIsolate();
+MaybeObject* JSProxy::GetPropertyWithHandler(Object* receiver_raw,
+                                             String* name_raw) {
+  Isolate* isolate = GetIsolate();
   HandleScope scope(isolate);
   Handle<Object> receiver(receiver_raw);
   Handle<Object> name(name_raw);
-  Handle<Object> handler(handler_raw);
 
-  // Extract trap function.
-  Handle<String> trap_name = isolate->factory()->LookupAsciiSymbol("get");
-  Handle<Object> trap(v8::internal::GetProperty(handler, trap_name));
+  Handle<Object> args[] = { receiver, name };
+  Handle<Object> result = CallTrap(
+    "get", isolate->derived_get_trap(), ARRAY_SIZE(args), args);
   if (isolate->has_pending_exception()) return Failure::Exception();
-  if (trap->IsUndefined()) {
-    // Get the derived `get' property.
-    trap = isolate->derived_get_trap();
-  }
-
-  // Call trap function.
-  Object** args[] = { receiver.location(), name.location() };
-  bool has_exception;
-  Handle<Object> result =
-      Execution::Call(trap, handler, ARRAY_SIZE(args), args, &has_exception);
-  if (has_exception) return Failure::Exception();
 
   return *result;
 }
@@ -566,14 +546,13 @@ MaybeObject* Object::GetProperty(Object* receiver,
   }
   *attributes = result->GetAttributes();
   Object* value;
-  JSObject* holder = result->holder();
   switch (result->type()) {
     case NORMAL:
-      value = holder->GetNormalizedProperty(result);
+      value = result->holder()->GetNormalizedProperty(result);
       ASSERT(!value->IsTheHole() || result->IsReadOnly());
       return value->IsTheHole() ? heap->undefined_value() : value;
     case FIELD:
-      value = holder->FastPropertyAt(result->GetFieldIndex());
+      value = result->holder()->FastPropertyAt(result->GetFieldIndex());
       ASSERT(!value->IsTheHole() || result->IsReadOnly());
       return value->IsTheHole() ? heap->undefined_value() : value;
     case CONSTANT_FUNCTION:
@@ -582,14 +561,13 @@ MaybeObject* Object::GetProperty(Object* receiver,
       return GetPropertyWithCallback(receiver,
                                      result->GetCallbackObject(),
                                      name,
-                                     holder);
-    case HANDLER: {
-      JSProxy* proxy = JSProxy::cast(this);
-      return GetPropertyWithHandler(receiver, name, proxy->handler());
-    }
+                                     result->holder());
+    case HANDLER:
+      return result->proxy()->GetPropertyWithHandler(receiver, name);
     case INTERCEPTOR: {
       JSObject* recvr = JSObject::cast(receiver);
-      return holder->GetPropertyWithInterceptor(recvr, name, attributes);
+      return result->holder()->GetPropertyWithInterceptor(
+          recvr, name, attributes);
     }
     case MAP_TRANSITION:
     case ELEMENTS_TRANSITION:
@@ -1900,12 +1878,12 @@ MaybeObject* JSObject::SetPropertyWithCallback(Object* structure,
 }
 
 
-MaybeObject* JSObject::SetPropertyWithDefinedSetter(JSFunction* setter,
+MaybeObject* JSReceiver::SetPropertyWithDefinedSetter(JSFunction* setter,
                                                       Object* value) {
   Isolate* isolate = GetIsolate();
   Handle<Object> value_handle(value, isolate);
   Handle<JSFunction> fun(JSFunction::cast(setter), isolate);
-  Handle<JSObject> self(this, isolate);
+  Handle<JSReceiver> self(this, isolate);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   Debug* debug = isolate->debug();
   // Handle stepping into a setter if step into is active.
@@ -1928,6 +1906,9 @@ void JSObject::LookupCallbackSetterInPrototypes(String* name,
   for (Object* pt = GetPrototype();
        pt != heap->null_value();
        pt = pt->GetPrototype()) {
+    if (pt->IsJSProxy()) {
+      return result->HandlerResult(JSProxy::cast(pt));
+    }
     JSObject::cast(pt)->LocalLookupRealNamedProperty(name, result);
     if (result->IsProperty()) {
       if (result->type() == CALLBACKS && !result->IsReadOnly()) return;
@@ -2092,6 +2073,7 @@ void JSObject::LocalLookupRealNamedProperty(String* name,
     Object* proto = GetPrototype();
     if (proto->IsNull()) return result->NotFound();
     ASSERT(proto->IsJSGlobalObject());
+    // A GlobalProxy's prototype should always be a proper JSObject.
     return JSObject::cast(proto)->LocalLookupRealNamedProperty(name, result);
   }
 
@@ -2218,7 +2200,7 @@ MaybeObject* JSReceiver::SetProperty(LookupResult* result,
                                      PropertyAttributes attributes,
                                      StrictModeFlag strict_mode) {
   if (result->IsFound() && result->type() == HANDLER) {
-    return JSProxy::cast(this)->SetPropertyWithHandler(
+    return result->proxy()->SetPropertyWithHandler(
         key, value, attributes, strict_mode);
   } else {
     return JSObject::cast(this)->SetPropertyForResult(
@@ -2232,22 +2214,11 @@ bool JSProxy::HasPropertyWithHandler(String* name_raw) {
   HandleScope scope(isolate);
   Handle<Object> receiver(this);
   Handle<Object> name(name_raw);
-  Handle<Object> handler(this->handler());
 
-  // Extract trap function.
-  Handle<String> trap_name = isolate->factory()->LookupAsciiSymbol("has");
-  Handle<Object> trap(v8::internal::GetProperty(handler, trap_name));
+  Handle<Object> args[] = { name };
+  Handle<Object> result = CallTrap(
+    "has", isolate->derived_has_trap(), ARRAY_SIZE(args), args);
   if (isolate->has_pending_exception()) return Failure::Exception();
-  if (trap->IsUndefined()) {
-    trap = isolate->derived_has_trap();
-  }
-
-  // Call trap function.
-  Object** args[] = { name.location() };
-  bool has_exception;
-  Handle<Object> result =
-      Execution::Call(trap, handler, ARRAY_SIZE(args), args, &has_exception);
-  if (has_exception) return Failure::Exception();
 
   return result->ToBoolean()->IsTrue();
 }
@@ -2263,23 +2234,10 @@ MUST_USE_RESULT MaybeObject* JSProxy::SetPropertyWithHandler(
   Handle<Object> receiver(this);
   Handle<Object> name(name_raw);
   Handle<Object> value(value_raw);
-  Handle<Object> handler(this->handler());
 
-  // Extract trap function.
-  Handle<String> trap_name = isolate->factory()->LookupAsciiSymbol("set");
-  Handle<Object> trap(v8::internal::GetProperty(handler, trap_name));
+  Handle<Object> args[] = { receiver, name, value };
+  CallTrap("set", isolate->derived_set_trap(), ARRAY_SIZE(args), args);
   if (isolate->has_pending_exception()) return Failure::Exception();
-  if (trap->IsUndefined()) {
-    trap = isolate->derived_set_trap();
-  }
-
-  // Call trap function.
-  Object** args[] = {
-      receiver.location(), name.location(), value.location()
-  };
-  bool has_exception;
-  Execution::Call(trap, handler, ARRAY_SIZE(args), args, &has_exception);
-  if (has_exception) return Failure::Exception();
 
   return *value;
 }
@@ -2291,31 +2249,16 @@ MUST_USE_RESULT MaybeObject* JSProxy::DeletePropertyWithHandler(
   HandleScope scope(isolate);
   Handle<Object> receiver(this);
   Handle<Object> name(name_raw);
-  Handle<Object> handler(this->handler());
 
-  // Extract trap function.
-  Handle<String> trap_name = isolate->factory()->LookupAsciiSymbol("delete");
-  Handle<Object> trap(v8::internal::GetProperty(handler, trap_name));
+  Handle<Object> args[] = { name };
+  Handle<Object> result = CallTrap(
+    "delete", Handle<Object>(), ARRAY_SIZE(args), args);
   if (isolate->has_pending_exception()) return Failure::Exception();
-  if (trap->IsUndefined()) {
-    Handle<Object> args[] = { handler, trap_name };
-    Handle<Object> error = isolate->factory()->NewTypeError(
-        "handler_trap_missing", HandleVector(args, ARRAY_SIZE(args)));
-    isolate->Throw(*error);
-    return Failure::Exception();
-  }
-
-  // Call trap function.
-  Object** args[] = { name.location() };
-  bool has_exception;
-  Handle<Object> result =
-      Execution::Call(trap, handler, ARRAY_SIZE(args), args, &has_exception);
-  if (has_exception) return Failure::Exception();
 
   Object* bool_result = result->ToBoolean();
-  if (mode == STRICT_DELETION &&
-      bool_result == isolate->heap()->false_value()) {
-    Handle<Object> args[] = { handler, trap_name };
+  if (mode == STRICT_DELETION && bool_result == GetHeap()->false_value()) {
+    Handle<String> trap_name = isolate->factory()->LookupAsciiSymbol("delete");
+    Handle<Object> args[] = { Handle<Object>(handler()), trap_name };
     Handle<Object> error = isolate->factory()->NewTypeError(
         "handler_failed", HandleVector(args, ARRAY_SIZE(args)));
     isolate->Throw(*error);
@@ -2327,36 +2270,20 @@ MUST_USE_RESULT MaybeObject* JSProxy::DeletePropertyWithHandler(
 
 MUST_USE_RESULT PropertyAttributes JSProxy::GetPropertyAttributeWithHandler(
     JSReceiver* receiver_raw,
-    String* name_raw,
-    bool* has_exception) {
+    String* name_raw) {
   Isolate* isolate = GetIsolate();
   HandleScope scope(isolate);
   Handle<JSReceiver> receiver(receiver_raw);
   Handle<Object> name(name_raw);
-  Handle<Object> handler(this->handler());
 
-  // Extract trap function.
-  Handle<String> trap_name =
-      isolate->factory()->LookupAsciiSymbol("getPropertyDescriptor");
-  Handle<Object> trap(v8::internal::GetProperty(handler, trap_name));
+  Handle<Object> args[] = { name };
+  Handle<Object> result = CallTrap(
+    "getPropertyDescriptor", Handle<Object>(), ARRAY_SIZE(args), args);
   if (isolate->has_pending_exception()) return NONE;
-  if (trap->IsUndefined()) {
-    Handle<Object> args[] = { handler, trap_name };
-    Handle<Object> error = isolate->factory()->NewTypeError(
-        "handler_trap_missing", HandleVector(args, ARRAY_SIZE(args)));
-    isolate->Throw(*error);
-    *has_exception = true;
-    return NONE;
-  }
 
-  // Call trap function.
-  Object** args[] = { name.location() };
-  Handle<Object> result =
-      Execution::Call(trap, handler, ARRAY_SIZE(args), args, has_exception);
-  if (has_exception) return NONE;
+  if (result->IsUndefined()) return ABSENT;
 
   // TODO(rossberg): convert result to PropertyAttributes
-  USE(result);
   return NONE;
 }
 
@@ -2376,6 +2303,34 @@ void JSProxy::Fix() {
 }
 
 
+MUST_USE_RESULT Handle<Object> JSProxy::CallTrap(
+    const char* name,
+    Handle<Object> derived,
+    int argc,
+    Handle<Object> args[]) {
+  Isolate* isolate = GetIsolate();
+  Handle<Object> handler(this->handler());
+
+  Handle<String> trap_name = isolate->factory()->LookupAsciiSymbol(name);
+  Handle<Object> trap(v8::internal::GetProperty(handler, trap_name));
+  if (isolate->has_pending_exception()) return trap;
+
+  if (trap->IsUndefined()) {
+    if (*derived == NULL) {
+      Handle<Object> args[] = { handler, trap_name };
+      Handle<Object> error = isolate->factory()->NewTypeError(
+        "handler_trap_missing", HandleVector(args, ARRAY_SIZE(args)));
+      isolate->Throw(*error);
+      return Handle<Object>();
+    }
+    trap = Handle<Object>(derived);
+  }
+
+  Object*** argv = reinterpret_cast<Object***>(args);
+  bool threw = false;
+  return Execution::Call(trap, handler, argc, argv, &threw);
+}
+
 
 MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
                                             String* name,
@@ -2400,20 +2355,18 @@ MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
   }
 
   // Check access rights if needed.
-  if (IsAccessCheckNeeded()
-      && !heap->isolate()->MayNamedAccess(this, name, v8::ACCESS_SET)) {
-    return SetPropertyWithFailedAccessCheck(result,
-                                            name,
-                                            value,
-                                            true,
-                                            strict_mode);
+  if (IsAccessCheckNeeded()) {
+    if (!heap->isolate()->MayNamedAccess(this, name, v8::ACCESS_SET)) {
+      return SetPropertyWithFailedAccessCheck(
+          result, name, value, true, strict_mode);
+    }
   }
 
   if (IsJSGlobalProxy()) {
     Object* proto = GetPrototype();
     if (proto->IsNull()) return value;
     ASSERT(proto->IsJSGlobalObject());
-    return JSObject::cast(proto)->SetProperty(
+    return JSObject::cast(proto)->SetPropertyForResult(
         result, name, value, attributes, strict_mode);
   }
 
@@ -2422,26 +2375,81 @@ MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
     // accessor that wants to handle the property.
     LookupResult accessor_result;
     LookupCallbackSetterInPrototypes(name, &accessor_result);
-    if (accessor_result.IsProperty()) {
+    if (accessor_result.IsFound()) {
+      if (accessor_result.type() == CALLBACKS) {
         return SetPropertyWithCallback(accessor_result.GetCallbackObject(),
                                        name,
                                        value,
                                        accessor_result.holder(),
                                        strict_mode);
+      } else if (accessor_result.type() == HANDLER) {
+        // There is a proxy in the prototype chain. Invoke its
+        // getOwnPropertyDescriptor trap.
+        Isolate* isolate = heap->isolate();
+        Handle<JSObject> self(this);
+        Handle<String> hname(name);
+        Handle<Object> hvalue(value);
+        Handle<JSProxy> proxy(accessor_result.proxy());
+        Handle<Object> args[] = { hname };
+        Handle<Object> result = proxy->CallTrap(
+          "getOwnPropertyDescriptor", Handle<Object>(), ARRAY_SIZE(args), args);
+        if (isolate->has_pending_exception()) return Failure::Exception();
+
+        if (!result->IsUndefined()) {
+          // The proxy handler cares about this property.
+          // Check whether it is virtualized as an accessor.
+          Handle<String> getter_name =
+              isolate->factory()->LookupAsciiSymbol("get");
+          Handle<Object> getter(
+              v8::internal::GetProperty(result, getter_name));
+          if (isolate->has_pending_exception()) return Failure::Exception();
+          Handle<String> setter_name =
+              isolate->factory()->LookupAsciiSymbol("set");
+          Handle<Object> setter(
+              v8::internal::GetProperty(result, setter_name));
+          if (isolate->has_pending_exception()) return Failure::Exception();
+
+          if (!setter->IsUndefined()) {
+            // We have a setter -- invoke it.
+            if (setter->IsJSFunction()) {
+              return proxy->SetPropertyWithDefinedSetter(
+                  JSFunction::cast(*setter), *hvalue);
+            }
+            Handle<Object> args[] = { setter };
+            Handle<Object> error = isolate->factory()->NewTypeError(
+               "setter_must_be_callable", HandleVector(args, ARRAY_SIZE(args)));
+            return isolate->Throw(*error);
+          } else if (!getter->IsUndefined()) {
+            // We have a getter but no setter -- the property may not be
+            // written. In strict mode, throw an error.
+            if (strict_mode == kNonStrictMode) return *hvalue;
+            Handle<Object> args[] = { hname, proxy };
+            Handle<Object> error = isolate->factory()->NewTypeError(
+                "no_setter_in_callback", HandleVector(args, ARRAY_SIZE(args)));
+            return isolate->Throw(*error);
+          }
+          // The proxy does not define the property as an accessor.
+          // Consequently, it has no effect on setting the receiver.
+          return self->AddProperty(*hname, *hvalue, attributes, strict_mode);
         }
       }
+    }
+  }
+
+  // At this point, no GC should have happened, as this would invalidate
+  // 'result', which we cannot handlify!
+
   if (!result->IsFound()) {
     // Neither properties nor transitions found.
     return AddProperty(name, value, attributes, strict_mode);
   }
   if (result->IsReadOnly() && result->IsProperty()) {
     if (strict_mode == kStrictMode) {
-      HandleScope scope(heap->isolate());
-      Handle<String> key(name);
-      Handle<Object> holder(this);
-      Handle<Object> args[2] = { key, holder };
+      Handle<JSObject> self(this);
+      Handle<String> hname(name);
+      Handle<Object> args[] = { hname, self };
       return heap->isolate()->Throw(*heap->isolate()->factory()->NewTypeError(
-          "strict_read_only_property", HandleVector(args, 2)));
+          "strict_read_only_property", HandleVector(args, ARRAY_SIZE(args))));
     } else {
       return value;
     }
@@ -2702,10 +2710,8 @@ PropertyAttributes JSReceiver::GetPropertyAttribute(JSReceiver* receiver,
       case CALLBACKS:
         return result->GetAttributes();
       case HANDLER: {
-        // TODO(rossberg): propagate exceptions properly.
-        bool has_exception = false;
-        return JSProxy::cast(this)->GetPropertyAttributeWithHandler(
-            receiver, name, &has_exception);
+        return JSProxy::cast(result->proxy())->GetPropertyAttributeWithHandler(
+            receiver, name);
       }
       case INTERCEPTOR:
         return result->holder()->GetPropertyAttributeWithInterceptor(
@@ -3516,15 +3522,6 @@ AccessorDescriptor* Map::FindAccessor(String* name) {
 
 
 void JSReceiver::LocalLookup(String* name, LookupResult* result) {
-  if (IsJSProxy()) {
-    result->HandlerResult();
-  } else {
-    JSObject::cast(this)->LocalLookup(name, result);
-  }
-}
-
-
-void JSObject::LocalLookup(String* name, LookupResult* result) {
   ASSERT(name->IsString());
 
   Heap* heap = GetHeap();
@@ -3533,28 +3530,36 @@ void JSObject::LocalLookup(String* name, LookupResult* result) {
     Object* proto = GetPrototype();
     if (proto->IsNull()) return result->NotFound();
     ASSERT(proto->IsJSGlobalObject());
-    return JSObject::cast(proto)->LocalLookup(name, result);
+    return JSReceiver::cast(proto)->LocalLookup(name, result);
+  }
+
+  if (IsJSProxy()) {
+    result->HandlerResult(JSProxy::cast(this));
+    return;
   }
 
   // Do not use inline caching if the object is a non-global object
   // that requires access checks.
-  if (!IsJSGlobalProxy() && IsAccessCheckNeeded()) {
+  if (IsAccessCheckNeeded()) {
     result->DisallowCaching();
   }
 
+  JSObject* js_object = JSObject::cast(this);
+
   // Check __proto__ before interceptor.
   if (name->Equals(heap->Proto_symbol()) && !IsJSContextExtensionObject()) {
-    result->ConstantResult(this);
+    result->ConstantResult(js_object);
     return;
   }
 
   // Check for lookup interceptor except when bootstrapping.
-  if (HasNamedInterceptor() && !heap->isolate()->bootstrapper()->IsActive()) {
-    result->InterceptorResult(this);
+  if (js_object->HasNamedInterceptor() &&
+      !heap->isolate()->bootstrapper()->IsActive()) {
+    result->InterceptorResult(js_object);
     return;
   }
 
-  LocalLookupRealNamedProperty(name, result);
+  js_object->LocalLookupRealNamedProperty(name, result);
 }
 
 
@@ -3564,7 +3569,7 @@ void JSReceiver::Lookup(String* name, LookupResult* result) {
   for (Object* current = this;
        current != heap->null_value();
        current = JSObject::cast(current)->GetPrototype()) {
-    JSObject::cast(current)->LocalLookup(name, result);
+    JSReceiver::cast(current)->LocalLookup(name, result);
     if (result->IsProperty()) return;
   }
   result->NotFound();
@@ -6217,10 +6222,10 @@ void Map::CreateBackPointers() {
       // Verify target.
       Object* source_prototype = prototype();
       Object* target_prototype = target->prototype();
-      ASSERT(source_prototype->IsJSObject() ||
+      ASSERT(source_prototype->IsJSReceiver() ||
              source_prototype->IsMap() ||
              source_prototype->IsNull());
-      ASSERT(target_prototype->IsJSObject() ||
+      ASSERT(target_prototype->IsJSReceiver() ||
              target_prototype->IsNull());
       ASSERT(source_prototype->IsMap() ||
              source_prototype == target_prototype);
@@ -7754,7 +7759,7 @@ MaybeObject* JSReceiver::SetPrototype(Object* value,
   // It is sufficient to validate that the receiver is not in the new prototype
   // chain.
   for (Object* pt = value; pt != heap->null_value(); pt = pt->GetPrototype()) {
-    if (JSObject::cast(pt) == this) {
+    if (JSReceiver::cast(pt) == this) {
       // Cycle detected.
       HandleScope scope(heap->isolate());
       return heap->isolate()->Throw(
@@ -7769,8 +7774,8 @@ MaybeObject* JSReceiver::SetPrototype(Object* value,
     // hidden and set the new prototype on that object.
     Object* current_proto = real_receiver->GetPrototype();
     while (current_proto->IsJSObject() &&
-          JSObject::cast(current_proto)->map()->is_hidden_prototype()) {
-      real_receiver = JSObject::cast(current_proto);
+          JSReceiver::cast(current_proto)->map()->is_hidden_prototype()) {
+      real_receiver = JSReceiver::cast(current_proto);
       current_proto = current_proto->GetPrototype();
     }
   }

src/objects.h

@@ -907,9 +907,6 @@ class Object : public MaybeObject {
                                                        Object* structure,
                                                        String* name,
                                                        Object* holder);
-  MUST_USE_RESULT MaybeObject* GetPropertyWithHandler(Object* receiver,
-                                                      String* name,
-                                                      Object* handler);
   MUST_USE_RESULT MaybeObject* GetPropertyWithDefinedGetter(Object* receiver,
                                                             JSFunction* getter);
 
@@ -1448,6 +1445,8 @@ class JSReceiver: public HeapObject {
                                            Object* value,
                                            PropertyAttributes attributes,
                                            StrictModeFlag strict_mode);
+  MUST_USE_RESULT MaybeObject* SetPropertyWithDefinedSetter(JSFunction* setter,
+                                                            Object* value);
 
   MUST_USE_RESULT MaybeObject* DeleteProperty(String* name, DeleteMode mode);
 
@@ -1554,6 +1553,7 @@ class JSObject: public JSReceiver {
   // a dictionary, and it will stay a dictionary.
   MUST_USE_RESULT MaybeObject* PrepareSlowElementsForSort(uint32_t limit);
 
+  // Can cause GC.
   MUST_USE_RESULT MaybeObject* SetPropertyForResult(LookupResult* result,
                                            String* key,
                                            Object* value,
@@ -1571,8 +1571,6 @@ class JSObject: public JSReceiver {
       Object* value,
       JSObject* holder,
       StrictModeFlag strict_mode);
-  MUST_USE_RESULT MaybeObject* SetPropertyWithDefinedSetter(JSFunction* setter,
-                                                            Object* value);
   MUST_USE_RESULT MaybeObject* SetPropertyWithInterceptor(
       String* name,
       Object* value,
@@ -1801,10 +1799,6 @@ class JSObject: public JSReceiver {
   inline Object* GetInternalField(int index);
   inline void SetInternalField(int index, Object* value);
 
-  // Lookup a property.  If found, the result is valid and has
-  // detailed information.
-  void LocalLookup(String* name, LookupResult* result);
-
   // The following lookup functions skip interceptors.
   void LocalLookupRealNamedProperty(String* name, LookupResult* result);
   void LookupRealNamedProperty(String* name, LookupResult* result);
@@ -6708,6 +6702,10 @@ class JSProxy: public JSReceiver {
 
   bool HasPropertyWithHandler(String* name);
 
+  MUST_USE_RESULT MaybeObject* GetPropertyWithHandler(
+      Object* receiver,
+      String* name);
+
   MUST_USE_RESULT MaybeObject* SetPropertyWithHandler(
       String* name,
       Object* value,
@@ -6720,8 +6718,7 @@ class JSProxy: public JSReceiver {
 
   MUST_USE_RESULT PropertyAttributes GetPropertyAttributeWithHandler(
       JSReceiver* receiver,
-      String* name,
-      bool* has_exception);
+      String* name);
 
   // Turn this into an (empty) JSObject.
   void Fix();
@@ -6729,6 +6726,13 @@ class JSProxy: public JSReceiver {
   // Initializes the body after the handler slot.
   inline void InitializeBody(int object_size, Object* value);
 
+  // Invoke a trap by name. If the trap does not exist on this's handler,
+  // but derived_trap is non-NULL, invoke that instead.  May cause GC.
+  Handle<Object> CallTrap(const char* name,
+                          Handle<Object> derived_trap,
+                          int argc,
+                          Handle<Object> args[]);
+
   // Dispatched behavior.
 #ifdef OBJECT_PRINT
   inline void JSProxyPrint() {

src/property.h

@@ -202,9 +202,9 @@ class LookupResult BASE_EMBEDDED {
     number_ = entry;
   }
 
-  void HandlerResult() {
+  void HandlerResult(JSProxy* proxy) {
     lookup_type_ = HANDLER_TYPE;
-    holder_ = NULL;
+    holder_ = proxy;
     details_ = PropertyDetails(NONE, HANDLER);
     cacheable_ = false;
   }
@@ -221,7 +221,12 @@ class LookupResult BASE_EMBEDDED {
 
   JSObject* holder() {
     ASSERT(IsFound());
-    return holder_;
+    return JSObject::cast(holder_);
+  }
+
+  JSProxy* proxy() {
+    ASSERT(IsFound());
+    return JSProxy::cast(holder_);
   }
 
   PropertyType type() {
@@ -354,7 +359,7 @@ class LookupResult BASE_EMBEDDED {
     CONSTANT_TYPE
   } lookup_type_;
 
-  JSObject* holder_;
+  JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;

src/runtime.cc

@@ -4645,7 +4645,9 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_HasProperty) {
   if (args[0]->IsJSReceiver()) {
     JSReceiver* receiver = JSReceiver::cast(args[0]);
     CONVERT_CHECKED(String, key, args[1]);
-    if (receiver->HasProperty(key)) return isolate->heap()->true_value();
+    bool result = receiver->HasProperty(key);
+    if (isolate->has_pending_exception()) return Failure::Exception();
+    return isolate->heap()->ToBoolean(result);
   }
   return isolate->heap()->false_value();
 }

test/mjsunit/harmony/proxies.js

@@ -29,7 +29,8 @@
 
 
 // TODO(rossberg): for-in for proxies not implemented.
-// TODO(rossberg): inheritance from proxies not implemented.
+// TODO(rossberg): integer-index properties not implemented properly.
+
 
 // Helper.
 
@@ -39,7 +40,89 @@ function TestWithProxies(test, handler) {
 }
 
 
-// Getters.
+
+// Getting property descriptors (Object.getOwnPropertyDescriptor).
+
+var key
+
+function TestGetOwnProperty(handler) {
+  TestWithProxies(TestGetOwnProperty2, handler)
+}
+
+function TestGetOwnProperty2(handler, create) {
+  var p = create(handler)
+  assertEquals(42, Object.getOwnPropertyDescriptor(p, "a").value)
+  assertEquals("a", key)
+}
+
+TestGetOwnProperty({
+  getOwnPropertyDescriptor: function(k) {
+    key = k
+    return {value: 42, configurable: true}
+  }
+})
+
+TestGetOwnProperty({
+  getOwnPropertyDescriptor: function(k) {
+    return this.getOwnPropertyDescriptor2(k)
+  },
+  getOwnPropertyDescriptor2: function(k) {
+    key = k
+    return {value: 42, configurable: true}
+  }
+})
+
+TestGetOwnProperty({
+  getOwnPropertyDescriptor: function(k) {
+    key = k
+    return {get value() { return 42 }, get configurable() { return true }}
+  }
+})
+
+TestGetOwnProperty(Proxy.create({
+  get: function(pr, pk) {
+    return function(k) { key = k; return {value: 42, configurable: true} }
+  }
+}))
+
+
+function TestGetOwnPropertyThrow(handler) {
+  TestWithProxies(TestGetOwnPropertyThrow2, handler)
+}
+
+function TestGetOwnPropertyThrow2(handler, create) {
+  var p = create(handler)
+  assertThrows(function(){ Object.getOwnPropertyDescriptor(p, "a") }, "myexn")
+}
+
+TestGetOwnPropertyThrow({
+  getOwnPropertyDescriptor: function(k) { throw "myexn" }
+})
+
+TestGetOwnPropertyThrow({
+  getOwnPropertyDescriptor: function(k) {
+    return this.getPropertyDescriptor2(k)
+  },
+  getOwnPropertyDescriptor2: function(k) { throw "myexn" }
+})
+
+TestGetOwnPropertyThrow({
+  getOwnPropertyDescriptor: function(k) {
+    return {get value() { throw "myexn" }}
+  }
+})
+
+TestGetOwnPropertyThrow(Proxy.create({
+  get: function(pr, pk) {
+    return function(k) { throw "myexn" }
+  }
+}))
+
+
+
+// Getters (dot, brackets).
+
+var key
 
 function TestGet(handler) {
   TestWithProxies(TestGet2, handler)
@@ -48,48 +131,52 @@ function TestGet(handler) {
 function TestGet2(handler, create) {
   var p = create(handler)
   assertEquals(42, p.a)
+  assertEquals("a", key)
   assertEquals(42, p["b"])
+  assertEquals("b", key)
 
-  // TODO(rossberg): inheritance from proxies not yet implemented.
-  // var o = Object.create(p, {x: {value: 88}})
-  // assertEquals(42, o.a)
-  // assertEquals(42, o["b"])
-  // assertEquals(88, o.x)
-  // assertEquals(88, o["x"])
+  var o = Object.create(p, {x: {value: 88}})
+  assertEquals(42, o.a)
+  assertEquals("a", key)
+  assertEquals(42, o["b"])
+  assertEquals("b", key)
+  assertEquals(88, o.x)
+  assertEquals(88, o["x"])
 }
 
 TestGet({
-  get: function(r, k) { return 42 }
+  get: function(r, k) { key = k; return 42 }
 })
 
 TestGet({
   get: function(r, k) { return this.get2(r, k) },
-  get2: function(r, k) { return 42 }
+  get2: function(r, k) { key = k; return 42 }
 })
 
 TestGet({
-  getPropertyDescriptor: function(k) { return {value: 42} }
+  getPropertyDescriptor: function(k) { key = k; return {value: 42} }
 })
 
 TestGet({
   getPropertyDescriptor: function(k) { return this.getPropertyDescriptor2(k) },
-  getPropertyDescriptor2: function(k) { return {value: 42} }
+  getPropertyDescriptor2: function(k) { key = k; return {value: 42} }
 })
 
 TestGet({
   getPropertyDescriptor: function(k) {
+    key = k;
     return {get value() { return 42 }}
   }
 })
 
 TestGet({
   get: undefined,
-  getPropertyDescriptor: function(k) { return {value: 42} }
+  getPropertyDescriptor: function(k) { key = k; return {value: 42} }
 })
 
 TestGet(Proxy.create({
   get: function(pr, pk) {
-    return function(r, k) { return 42 }
+    return function(r, k) { key = k; return 42 }
   }
 }))
 
@@ -101,11 +188,27 @@ function TestGetCall(handler) {
 function TestGetCall2(handler, create) {
   var p = create(handler)
   assertEquals(55, p.f())
+  assertEquals(55, p["f"]())
   assertEquals(55, p.f("unused", "arguments"))
   assertEquals(55, p.f.call(p))
+  assertEquals(55, p["f"].call(p))
   assertEquals(55, p.withargs(45, 5))
   assertEquals(55, p.withargs.call(p, 11, 22))
   assertEquals("6655", "66" + p)  // calls p.toString
+
+  var o = Object.create(p, {g: {value: function(x) { return x + 88 }}})
+  assertEquals(55, o.f())
+  assertEquals(55, o["f"]())
+  assertEquals(55, o.f("unused", "arguments"))
+  assertEquals(55, o.f.call(o))
+  assertEquals(55, o.f.call(p))
+  assertEquals(55, o["f"].call(p))
+  assertEquals(55, o.withargs(45, 5))
+  assertEquals(55, o.withargs.call(p, 11, 22))
+  assertEquals(90, o.g(2))
+  assertEquals(91, o.g.call(o, 3))
+  assertEquals(92, o.g.call(p, 4))
+  assertEquals("6655", "66" + o)  // calls o.toString
 }
 
 TestGetCall({
@@ -170,6 +273,12 @@ function TestGetThrow2(handler, create) {
   var p = create(handler)
   assertThrows(function(){ p.a }, "myexn")
   assertThrows(function(){ p["b"] }, "myexn")
+
+  var o = Object.create(p, {x: {value: 88}})
+  assertThrows(function(){ o.a }, "myexn")
+  assertThrows(function(){ o["b"] }, "myexn")
+  assertEquals(88, o.x)
+  assertEquals(88, o["x"])
 }
 
 TestGetThrow({
@@ -302,7 +411,6 @@ TestSet(Proxy.create({
 }))
 
 
-
 function TestSetThrow(handler, create) {
   TestWithProxies(TestSetThrow2, handler)
 }
@@ -422,6 +530,77 @@ TestSetThrow(Proxy.create({
 }))
 
 
+var key
+var val
+
+function TestSetForDerived(handler, create) {
+  TestWithProxies(TestSetForDerived2, handler)
+}
+
+function TestSetForDerived2(handler, create) {
+  var p = create(handler)
+  var o = Object.create(p, {x: {value: 88, writable: true}})
+
+  key = ""
+  assertEquals(48, o.x = 48)
+  assertEquals("", key)  // trap not invoked
+  assertEquals(48, o.x)
+
+  assertEquals(49, o.y = 49)
+  assertEquals("y", key)
+  assertEquals(49, o.y)
+
+  assertEquals(44, o.p_writable = 44)
+  assertEquals("p_writable", key)
+  assertEquals(44, o.p_writable)
+
+  assertEquals(45, o.p_nonwritable = 45)
+  assertEquals("p_nonwritable", key)
+  assertEquals(45, o.p_nonwritable)
+
+  assertEquals(46, o.p_setter = 46)
+  assertEquals("p_setter", key)
+  assertEquals(46, val)  // written to parent
+  assertFalse(Object.prototype.hasOwnProperty.call(o, "p_setter"))
+
+  val = ""
+  assertEquals(47, o.p_nosetter = 47)
+  assertEquals("p_nosetter", key)
+  assertEquals("", val)  // not written at all
+  assertFalse(Object.prototype.hasOwnProperty.call(o, "p_nosetter"));
+
+  key = ""
+  assertThrows(function(){ "use strict"; o.p_nosetter = 50 }, TypeError)
+  assertEquals("p_nosetter", key)
+  assertEquals("", val)  // not written at all
+
+  assertThrows(function(){ o.p_throw = 51 }, "myexn")
+  assertEquals("p_throw", key)
+
+  assertThrows(function(){ o.p_setterthrow = 52 }, "myexn")
+  assertEquals("p_setterthrow", key)
+}
+
+TestSetForDerived({
+  getOwnPropertyDescriptor: function(k) {
+    key = k;
+    switch (k) {
+      case "p_writable": return {writable: true}
+      case "p_nonwritable": return {writable: false}
+      case "p_setter":return {set: function(x) { val = x }}
+      case "p_nosetter": return {get: function() { return 1 }}
+      case "p_throw": throw "myexn"
+      case "p_setterthrow": return {set: function(x) { throw "myexn" }}
+      default: return undefined
+    }
+  }
+})
+
+
+// TODO(rossberg): TestSetReject, returning false
+// TODO(rossberg): TestGetProperty, TestSetProperty
+
+
 
 // Property definition (Object.defineProperty and Object.defineProperties).
 
@@ -828,7 +1007,7 @@ TestIn({
 })
 
 TestIn({
-  get: undefined,
+  has: undefined,
   getPropertyDescriptor: function(k) {
     key = k; return k < "z" ? {value: 42} : void 0
   }
@@ -874,7 +1053,7 @@ TestInThrow({
 })
 
 TestInThrow({
-  get: undefined,
+  has: undefined,
   getPropertyDescriptor: function(k) { throw "myexn" }
 })
 
@@ -889,6 +1068,101 @@ TestInThrow(Proxy.create({
 }))
 
 
+/* TODO(rossberg): does not work yet, JSProxy::GetPropertyAttributeWithHandler
+ * is not fully implemented.*/
+function TestInForDerived(handler) {
+  TestWithProxies(TestInForDerived2, handler)
+}
+
+function TestInForDerived2(handler, create) {
+  var p = create(handler)
+  var o = Object.create(p)
+  assertTrue("a" in o)
+  assertEquals("a", key)
+// TODO(rossberg): integer indexes not correctly imlemeted yet
+//  assertTrue(99 in o)
+//  assertEquals("99", key)
+  assertFalse("z" in o)
+  assertEquals("z", key)
+
+  assertEquals(2, ("a" in o) ? 2 : 0)
+  assertEquals(0, !("a" in o) ? 2 : 0)
+  assertEquals(0, ("zzz" in o) ? 2 : 0)
+  assertEquals(2, !("zzz" in o) ? 2 : 0)
+
+  if ("b" in o) {
+  } else {
+    assertTrue(false)
+  }
+  assertEquals("b", key)
+
+  if ("zz" in o) {
+    assertTrue(false)
+  }
+  assertEquals("zz", key)
+
+  if (!("c" in o)) {
+    assertTrue(false)
+  }
+  assertEquals("c", key)
+
+  if (!("zzz" in o)) {
+  } else {
+    assertTrue(false)
+  }
+  assertEquals("zzz", key)
+}
+
+TestInForDerived({
+  getPropertyDescriptor: function(k) {
+    key = k; return k < "z" ? {value: 42} : void 0
+  }
+})
+
+TestInForDerived({
+  getPropertyDescriptor: function(k) { return this.getPropertyDescriptor2(k) },
+  getPropertyDescriptor2: function(k) {
+    key = k; return k < "z" ? {value: 42} : void 0
+  }
+})
+
+TestInForDerived({
+  getPropertyDescriptor: function(k) {
+    key = k; return k < "z" ? {get value() { return 42 }} : void 0
+  }
+})
+
+/* TODO(rossberg): this will work once we implement the newest proposal
+ * regarding default traps for getPropertyDescriptor.
+TestInForDerived({
+  getOwnPropertyDescriptor: function(k) {
+    key = k; return k < "z" ? {value: 42} : void 0
+  }
+})
+
+TestInForDerived({
+  getOwnPropertyDescriptor: function(k) {
+    return this.getOwnPropertyDescriptor2(k)
+  },
+  getOwnPropertyDescriptor2: function(k) {
+    key = k; return k < "z" ? {value: 42} : void 0
+  }
+})
+
+TestInForDerived({
+  getOwnPropertyDescriptor: function(k) {
+    key = k; return k < "z" ? {get value() { return 42 }} : void 0
+  }
+})
+*/
+
+TestInForDerived(Proxy.create({
+  get: function(pr, pk) {
+    return function(k) { key = k; return k < "z" ? {value: 42} : void 0 }
+  }
+}))
+
+
 
 // Own Properties (Object.prototype.hasOwnProperty).
 
@@ -1004,34 +1278,46 @@ TestHasOwnThrow(Proxy.create({
 // Instanceof (instanceof)
 
 function TestInstanceof() {
-  var o = {}
+  var o1 = {}
   var p1 = Proxy.create({})
-  var p2 = Proxy.create({}, o)
+  var p2 = Proxy.create({}, o1)
   var p3 = Proxy.create({}, p2)
+  var o2 = Object.create(p2)
 
   var f0 = function() {}
-  f0.prototype = o
+  f0.prototype = o1
   var f1 = function() {}
   f1.prototype = p1
   var f2 = function() {}
   f2.prototype = p2
-
-  assertTrue(o instanceof Object)
-  assertFalse(o instanceof f0)
-  assertFalse(o instanceof f1)
-  assertFalse(o instanceof f2)
+  var f3 = function() {}
+  f3.prototype = o2
+
+  assertTrue(o1 instanceof Object)
+  assertFalse(o1 instanceof f0)
+  assertFalse(o1 instanceof f1)
+  assertFalse(o1 instanceof f2)
+  assertFalse(o1 instanceof f3)
   assertFalse(p1 instanceof Object)
   assertFalse(p1 instanceof f0)
   assertFalse(p1 instanceof f1)
   assertFalse(p1 instanceof f2)
+  assertFalse(p1 instanceof f3)
   assertTrue(p2 instanceof Object)
   assertTrue(p2 instanceof f0)
   assertFalse(p2 instanceof f1)
   assertFalse(p2 instanceof f2)
+  assertFalse(p2 instanceof f3)
   assertTrue(p3 instanceof Object)
   assertTrue(p3 instanceof f0)
   assertFalse(p3 instanceof f1)
   assertTrue(p3 instanceof f2)
+  assertFalse(p3 instanceof f3)
+  assertTrue(o2 instanceof Object)
+  assertTrue(o2 instanceof f0)
+  assertFalse(o2 instanceof f1)
+  assertTrue(o2 instanceof f2)
+  assertFalse(o2 instanceof f3)
 
   var f = Proxy.createFunction({}, function() {})
   assertTrue(f instanceof Function)
@@ -1044,43 +1330,57 @@ TestInstanceof()
 // Prototype (Object.getPrototypeOf, Object.prototype.isPrototypeOf).
 
 function TestPrototype() {
-  var o = {}
+  var o1 = {}
   var p1 = Proxy.create({})
-  var p2 = Proxy.create({}, o)
+  var p2 = Proxy.create({}, o1)
   var p3 = Proxy.create({}, p2)
   var p4 = Proxy.create({}, 666)
+  var o2 = Object.create(p3)
 
-  assertSame(Object.getPrototypeOf(o), Object.prototype)
+  assertSame(Object.getPrototypeOf(o1), Object.prototype)
   assertSame(Object.getPrototypeOf(p1), null)
-  assertSame(Object.getPrototypeOf(p2), o)
+  assertSame(Object.getPrototypeOf(p2), o1)
   assertSame(Object.getPrototypeOf(p3), p2)
   assertSame(Object.getPrototypeOf(p4), null)
+  assertSame(Object.getPrototypeOf(o2), p3)
 
-  assertTrue(Object.prototype.isPrototypeOf(o))
+  assertTrue(Object.prototype.isPrototypeOf(o1))
   assertFalse(Object.prototype.isPrototypeOf(p1))
   assertTrue(Object.prototype.isPrototypeOf(p2))
   assertTrue(Object.prototype.isPrototypeOf(p3))
   assertFalse(Object.prototype.isPrototypeOf(p4))
-  assertTrue(Object.prototype.isPrototypeOf.call(Object.prototype, o))
+  assertTrue(Object.prototype.isPrototypeOf(o2))
+  assertTrue(Object.prototype.isPrototypeOf.call(Object.prototype, o1))
   assertFalse(Object.prototype.isPrototypeOf.call(Object.prototype, p1))
   assertTrue(Object.prototype.isPrototypeOf.call(Object.prototype, p2))
   assertTrue(Object.prototype.isPrototypeOf.call(Object.prototype, p3))
   assertFalse(Object.prototype.isPrototypeOf.call(Object.prototype, p4))
-  assertFalse(Object.prototype.isPrototypeOf.call(o, o))
-  assertFalse(Object.prototype.isPrototypeOf.call(o, p1))
-  assertTrue(Object.prototype.isPrototypeOf.call(o, p2))
-  assertTrue(Object.prototype.isPrototypeOf.call(o, p3))
-  assertFalse(Object.prototype.isPrototypeOf.call(o, p4))
+  assertTrue(Object.prototype.isPrototypeOf.call(Object.prototype, o2))
+  assertFalse(Object.prototype.isPrototypeOf.call(o1, o1))
+  assertFalse(Object.prototype.isPrototypeOf.call(o1, p1))
+  assertTrue(Object.prototype.isPrototypeOf.call(o1, p2))
+  assertTrue(Object.prototype.isPrototypeOf.call(o1, p3))
+  assertFalse(Object.prototype.isPrototypeOf.call(o1, p4))
+  assertTrue(Object.prototype.isPrototypeOf.call(o1, o2))
   assertFalse(Object.prototype.isPrototypeOf.call(p1, p1))
-  assertFalse(Object.prototype.isPrototypeOf.call(p1, o))
+  assertFalse(Object.prototype.isPrototypeOf.call(p1, o1))
   assertFalse(Object.prototype.isPrototypeOf.call(p1, p2))
   assertFalse(Object.prototype.isPrototypeOf.call(p1, p3))
   assertFalse(Object.prototype.isPrototypeOf.call(p1, p4))
+  assertFalse(Object.prototype.isPrototypeOf.call(p1, o2))
   assertFalse(Object.prototype.isPrototypeOf.call(p2, p1))
   assertFalse(Object.prototype.isPrototypeOf.call(p2, p2))
   assertTrue(Object.prototype.isPrototypeOf.call(p2, p3))
   assertFalse(Object.prototype.isPrototypeOf.call(p2, p4))
+  assertTrue(Object.prototype.isPrototypeOf.call(p2, o2))
   assertFalse(Object.prototype.isPrototypeOf.call(p3, p2))
+  assertTrue(Object.prototype.isPrototypeOf.call(p3, o2))
+  assertFalse(Object.prototype.isPrototypeOf.call(o2, o1))
+  assertFalse(Object.prototype.isPrototypeOf.call(o2, p1))
+  assertFalse(Object.prototype.isPrototypeOf.call(o2, p2))
+  assertFalse(Object.prototype.isPrototypeOf.call(o2, p3))
+  assertFalse(Object.prototype.isPrototypeOf.call(o2, p4))
+  assertFalse(Object.prototype.isPrototypeOf.call(o2, o2))
 
   var f = Proxy.createFunction({}, function() {})
   assertSame(Object.getPrototypeOf(f), Function.prototype)
@@ -1265,7 +1565,7 @@ TestKeysThrow([], {
 // Fixing (Object.freeze, Object.seal, Object.preventExtensions,
 //         Object.isFrozen, Object.isSealed, Object.isExtensible)
 
-// TODO(rossberg): use TestWithProxies to include funciton proxies
+// TODO(rossberg): use TestWithProxies to include function proxies
 function TestFix(names, handler) {
   var proto = {p: 77}
   var assertFixing = function(o, s, f, e) {
@@ -1312,6 +1612,14 @@ function TestFix(names, handler) {
                     Object.keys(p3).sort())
   assertEquals(proto, Object.getPrototypeOf(p3))
   assertEquals(77, p3.p)
+
+  var p = Proxy.create(handler, proto)
+  var o = Object.create(p)
+  assertFixing(p, false, false, true)
+  assertFixing(o, false, false, true)
+  Object.freeze(o)
+  assertFixing(p, false, false, true)
+  assertFixing(o, true, true, false)
 }
 
 TestFix([], {
@@ -1424,6 +1732,13 @@ function TestToString(handler) {
   assertEquals("my_proxy", Object.prototype.toLocaleString.call(f))
   assertEquals("toString", key)
   assertDoesNotThrow(function(){ Function.prototype.toString.call(f) })
+
+  var o = Object.create(p)
+  key = ""
+  assertEquals("[object Object]", Object.prototype.toString.call(o))
+  assertEquals("", key)
+  assertEquals("my_proxy", Object.prototype.toLocaleString.call(o))
+  assertEquals("toString", key)
 }
 
 TestToString({
@@ -1450,6 +1765,10 @@ function TestToStringThrow(handler) {
   var f = Proxy.createFunction(handler, function() {})
   assertEquals("[object Function]", Object.prototype.toString.call(f))
   assertThrows(function(){ Object.prototype.toLocaleString.call(f) }, "myexn")
+
+  var o = Object.create(p)
+  assertEquals("[object Object]", Object.prototype.toString.call(o))
+  assertThrows(function(){ Object.prototype.toLocaleString.call(o) }, "myexn")
 }
 
 TestToStringThrow({
@@ -1508,6 +1827,11 @@ function TestIsEnumerable2(handler, create) {
   assertEquals("2", key)
   assertFalse(Object.prototype.propertyIsEnumerable.call(p, "z"))
   assertEquals("z", key)
+
+  var o = Object.create(p)
+  key = ""
+  assertFalse(Object.prototype.propertyIsEnumerable.call(o, "a"))
+  assertEquals("", key)  // trap not invoked
 }
 
 TestIsEnumerable({