Revert of Remove more dead code after Object.observe removal

src/js/v8natives.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
@@ skipping 124 matching lines @@
   return %HasInPrototypeChain(V, O);
 }
 
 
 // ES6 19.1.3.4
 function ObjectPropertyIsEnumerable(V) {
   var P = TO_NAME(V);
   return %PropertyIsEnumerable(TO_OBJECT(this), P);
 }
 
+
+// Extensions for providing property getters and setters.
+function ObjectDefineGetter(name, fun) {
+  var receiver = this;
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
+    receiver = %GlobalProxy(ObjectDefineGetter);
+  }
+  if (!IS_CALLABLE(fun)) {
+    throw MakeTypeError(kObjectGetterExpectingFunction);
+  }
+  var desc = {get: fun, enumerable: true, configurable: true};
+  %reflect_define_property(receiver, name, desc);
+}
+
+
+function ObjectLookupGetter(name) {
+  var receiver = this;
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
+    receiver = %GlobalProxy(ObjectLookupGetter);
+  }
+  return %LookupAccessor(TO_OBJECT(receiver), TO_NAME(name), GETTER);
+}
+
+
+function ObjectDefineSetter(name, fun) {
+  var receiver = this;
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
+    receiver = %GlobalProxy(ObjectDefineSetter);
+  }
+  if (!IS_CALLABLE(fun)) {
+    throw MakeTypeError(kObjectSetterExpectingFunction);
+  }
+  var desc = {set: fun, enumerable: true, configurable: true};
+  %reflect_define_property(receiver, name, desc);
+}
+
+
+function ObjectLookupSetter(name) {
+  var receiver = this;
+  if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
+    receiver = %GlobalProxy(ObjectLookupSetter);
+  }
+  return %LookupAccessor(TO_OBJECT(receiver), TO_NAME(name), SETTER);
+}
+
+
 // ES6 7.3.9
 function GetMethod(obj, p) {
   var func = obj[p];
   if (IS_NULL_OR_UNDEFINED(func)) return UNDEFINED;
   if (IS_CALLABLE(func)) return func;
   throw MakeTypeError(kCalledNonCallable, typeof func);
 }
 
+
 // ES6 section 19.1.2.18.
 function ObjectSetPrototypeOf(obj, proto) {
   CHECK_OBJECT_COERCIBLE(obj, "Object.setPrototypeOf");
 
   if (proto !== null && !IS_RECEIVER(proto)) {
     throw MakeTypeError(kProtoObjectOrNull, proto);
   }
 
   if (IS_RECEIVER(obj)) {
     %SetPrototype(obj, proto);
   }
 
   return obj;
 }
 
+
 // ES6 B.2.2.1.1
 function ObjectGetProto() {
   return %object_get_prototype_of(this);
 }
 
 
 // ES6 B.2.2.1.2
 function ObjectSetProto(proto) {
   CHECK_OBJECT_COERCIBLE(this, "Object.prototype.__proto__");
 
@@ skipping 22 matching lines @@
 %AddNamedProperty(GlobalObject.prototype, "constructor", GlobalObject,
                   DONT_ENUM);
 
 // Set up non-enumerable functions on the Object.prototype object.
 utils.InstallFunctions(GlobalObject.prototype, DONT_ENUM, [
   "toString", ObjectToString,
   "toLocaleString", ObjectToLocaleString,
   "valueOf", ObjectValueOf,
   "isPrototypeOf", ObjectIsPrototypeOf,
   "propertyIsEnumerable", ObjectPropertyIsEnumerable,
-  // __defineGetter__ is added in bootstrapper.cc.
-  // __lookupGetter__ is added in bootstrapper.cc.
-  // __defineSetter__ is added in bootstrapper.cc.
-  // __lookupSetter__ is added in bootstrapper.cc.
+  "__defineGetter__", ObjectDefineGetter,
+  "__lookupGetter__", ObjectLookupGetter,
+  "__defineSetter__", ObjectDefineSetter,
+  "__lookupSetter__", ObjectLookupSetter
 ]);
 utils.InstallGetterSetter(
     GlobalObject.prototype, "__proto__", ObjectGetProto, ObjectSetProto);
 
 // Set up non-enumerable functions in the Object object.
 utils.InstallFunctions(GlobalObject, DONT_ENUM, [
   "setPrototypeOf", ObjectSetPrototypeOf,
   // getOwnPropertySymbols is added in symbol.js.
   // Others are added in bootstrapper.cc.
 ]);
@@ skipping 231 matching lines @@
   to.NumberIsNaN = NumberIsNaN;
   to.NumberIsInteger = NumberIsInteger;
   to.ObjectHasOwnProperty = GlobalObject.prototype.hasOwnProperty;
 });
 
 %InstallToContext([
   "object_value_of", ObjectValueOf,
 ]);
 
 })