[builtins] Migrate Object.getOwnPropertyDescriptor to C++.

The implementation of Object.getOwnPropertyDescriptor always called into
C++ anyway, so there's no need to have this JavaScript wrapper around at
all.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1606783002

Cr-Commit-Position: refs/heads/master@{#33379}

src/bootstrapper.cc

@@ -1098,6 +1098,8 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     Handle<JSFunction> object_freeze = SimpleInstallFunction(
         object_function, "freeze", Builtins::kObjectFreeze, 1, false);
     native_context()->set_object_freeze(*object_freeze);
+    SimpleInstallFunction(object_function, "getOwnPropertyDescriptor",
+                          Builtins::kObjectGetOwnPropertyDescriptor, 2, false);
     SimpleInstallFunction(object_function, "getOwnPropertySymbols",
                           Builtins::kObjectGetOwnPropertySymbols, 1, false);
     Handle<JSFunction> object_is_extensible =

src/builtins.cc

@@ -1566,6 +1566,30 @@ BUILTIN(ObjectFreeze) {
 }
 
 
+// ES6 section 19.1.2.6 Object.getOwnPropertyDescriptor ( O, P )
+BUILTIN(ObjectGetOwnPropertyDescriptor) {
+  HandleScope scope(isolate);
+  // 1. Let obj be ? ToObject(O).
+  Handle<Object> object = args.atOrUndefined(isolate, 1);
+  Handle<JSReceiver> receiver;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
+                                     Object::ToObject(isolate, object));
+  // 2. Let key be ? ToPropertyKey(P).
+  Handle<Object> property = args.atOrUndefined(isolate, 2);
+  Handle<Name> key;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
+                                     Object::ToName(isolate, property));
+  // 3. Let desc be ? obj.[[GetOwnProperty]](key).
+  PropertyDescriptor desc;
+  Maybe<bool> found =
+      JSReceiver::GetOwnPropertyDescriptor(isolate, receiver, key, &desc);
+  MAYBE_RETURN(found, isolate->heap()->exception());
+  // 4. Return FromPropertyDescriptor(desc).
+  if (!found.FromJust()) return isolate->heap()->undefined_value();
+  return *desc.ToObject(isolate);
+}
+
+
 // ES6 section 19.1.2.8 Object.getOwnPropertySymbols ( O )
 BUILTIN(ObjectGetOwnPropertySymbols) {
   HandleScope scope(isolate);

src/builtins.h

@@ -110,6 +110,7 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   V(ObjectAssign, kNone)                                       \
   V(ObjectCreate, kNone)                                       \
   V(ObjectFreeze, kNone)                                       \
+  V(ObjectGetOwnPropertyDescriptor, kNone)                     \
   V(ObjectGetOwnPropertySymbols, kNone)                        \
   V(ObjectIsExtensible, kNone)                                 \
   V(ObjectIsFrozen, kNone)                                     \

src/js/v8natives.js

@@ -772,12 +772,6 @@ function ObjectSetPrototypeOf(obj, proto) {
 }
 
 
-// ES6 section 19.1.2.6
-function ObjectGetOwnPropertyDescriptor(obj, p) {
-  return %GetOwnProperty(obj, p);
-}
-
-
 // ES5 section 15.2.3.4.
 function ObjectGetOwnPropertyNames(obj) {
   obj = TO_OBJECT(obj);
@@ -889,7 +883,6 @@ utils.InstallFunctions(GlobalObject, DONT_ENUM, [
   "defineProperties", ObjectDefineProperties,
   "getPrototypeOf", ObjectGetPrototypeOf,
   "setPrototypeOf", ObjectSetPrototypeOf,
-  "getOwnPropertyDescriptor", ObjectGetOwnPropertyDescriptor,
   "getOwnPropertyNames", ObjectGetOwnPropertyNames,
   // getOwnPropertySymbols is added in symbol.js.
   "is", SameValue,  // ECMA-262, Edition 6, section 19.1.2.10

src/runtime/runtime-object.cc

@@ -266,31 +266,6 @@ RUNTIME_FUNCTION(Runtime_GetOwnProperty_Legacy) {
 }
 
 
-// ES6 19.1.2.6
-RUNTIME_FUNCTION(Runtime_GetOwnProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, raw_name, 1);
-  // 1. Let obj be ? ToObject(O).
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, object,
-                                     Object::ToObject(isolate, object));
-  // 2. Let key be ? ToPropertyKey(P).
-  Handle<Name> key;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
-                                     Object::ToName(isolate, raw_name));
-
-  // 3. Let desc be ? obj.[[GetOwnProperty]](key).
-  PropertyDescriptor desc;
-  Maybe<bool> found = JSReceiver::GetOwnPropertyDescriptor(
-      isolate, Handle<JSReceiver>::cast(object), key, &desc);
-  MAYBE_RETURN(found, isolate->heap()->exception());
-  // 4. Return FromPropertyDescriptor(desc).
-  if (!found.FromJust()) return isolate->heap()->undefined_value();
-  return *desc.ToObject(isolate);
-}
-
-
 RUNTIME_FUNCTION(Runtime_OptimizeObjectForAddingMultipleProperties) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);

src/runtime/runtime.h

@@ -414,7 +414,6 @@ namespace internal {
   F(GetPrototype, 1, 1)                              \
   F(InternalSetPrototype, 2, 1)                      \
   F(SetPrototype, 2, 1)                              \
-  F(GetOwnProperty, 2, 1)                            \
   F(GetOwnProperty_Legacy, 2, 1)                     \
   F(OptimizeObjectForAddingMultipleProperties, 2, 1) \
   F(GetProperty, 2, 1)                               \