ES6: Implement Object.setPrototypeOf

This reverts commit bdc89ae76c15f3ef2626f8849744500248aec3ba.

This is a revert of the revert with test/webkit updated as needed.

Original CL Description:

http://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.setprototypeof

This just exposes the internal %SetPrototype and adds all the required
type checks as specified.

BUG=v8:2675
LOG=Y
R=dslomov@chromium.org, rossberg@chromium.org

Review URL: https://codereview.chromium.org/144193005

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18739 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/macros.py

@@ -139,6 +139,10 @@ macro IS_SPEC_OBJECT(arg)   = (%_IsSpecObject(arg));
 # we cannot handle those anyway.
 macro IS_SPEC_FUNCTION(arg) = (%_ClassOf(arg) === 'Function');
 
+# Macro for ES6 CheckObjectCoercible
+# Will throw a TypeError of the form "[functionName] called on null or undefined".
+macro CHECK_OBJECT_COERCIBLE(arg, functionName) = if (IS_NULL_OR_UNDEFINED(arg) && !IS_UNDETECTABLE(arg)) throw MakeTypeError('called_on_null_or_undefined', [functionName]);
+
 # Indices in bound function info retrieved by %BoundFunctionGetBindings(...).
 const kBoundFunctionIndex = 0;
 const kBoundThisIndex = 1;

src/messages.js

@@ -78,7 +78,7 @@ var kMessages = {
   getter_must_be_callable:       ["Getter must be a function: ", "%0"],
   setter_must_be_callable:       ["Setter must be a function: ", "%0"],
   value_and_accessor:            ["Invalid property.  A property cannot both have accessors and be writable or have a value, ", "%0"],
-  proto_object_or_null:          ["Object prototype may only be an Object or null"],
+  proto_object_or_null:          ["Object prototype may only be an Object or null: ", "%0"],
   property_desc_object:          ["Property description must be an object: ", "%0"],
   redefine_disallowed:           ["Cannot redefine property: ", "%0"],
   define_disallowed:             ["Cannot define property:", "%0", ", object is not extensible."],

src/string.js

@@ -61,10 +61,8 @@ function StringValueOf() {
 
 // ECMA-262, section 15.5.4.4
 function StringCharAt(pos) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.charAt"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.charAt");
+
   var result = %_StringCharAt(this, pos);
   if (%_IsSmi(result)) {
     result = %_StringCharAt(TO_STRING_INLINE(this), TO_INTEGER(pos));
@@ -75,10 +73,8 @@ function StringCharAt(pos) {
 
 // ECMA-262 section 15.5.4.5
 function StringCharCodeAt(pos) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.charCodeAt"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.charCodeAt");
+
   var result = %_StringCharCodeAt(this, pos);
   if (!%_IsSmi(result)) {
     result = %_StringCharCodeAt(TO_STRING_INLINE(this), TO_INTEGER(pos));
@@ -89,10 +85,8 @@ function StringCharCodeAt(pos) {
 
 // ECMA-262, section 15.5.4.6
 function StringConcat() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.concat"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.concat");
+
   var len = %_ArgumentsLength();
   var this_as_string = TO_STRING_INLINE(this);
   if (len === 1) {
@@ -113,10 +107,8 @@ function StringConcat() {
 
 // ECMA-262 section 15.5.4.7
 function StringIndexOf(pattern /* position */) {  // length == 1
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.indexOf"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.indexOf");
+
   var subject = TO_STRING_INLINE(this);
   pattern = TO_STRING_INLINE(pattern);
   var index = 0;
@@ -132,10 +124,8 @@ function StringIndexOf(pattern /* position */) {  // length == 1
 
 // ECMA-262 section 15.5.4.8
 function StringLastIndexOf(pat /* position */) {  // length == 1
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.lastIndexOf"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.lastIndexOf");
+
   var sub = TO_STRING_INLINE(this);
   var subLength = sub.length;
   var pat = TO_STRING_INLINE(pat);
@@ -165,10 +155,8 @@ function StringLastIndexOf(pat /* position */) {  // length == 1
 // This function is implementation specific.  For now, we do not
 // do anything locale specific.
 function StringLocaleCompare(other) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.localeCompare"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.localeCompare");
+
   return %StringLocaleCompare(TO_STRING_INLINE(this),
                               TO_STRING_INLINE(other));
 }
@@ -176,10 +164,8 @@ function StringLocaleCompare(other) {
 
 // ECMA-262 section 15.5.4.10
 function StringMatch(regexp) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.match"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.match");
+
   var subject = TO_STRING_INLINE(this);
   if (IS_REGEXP(regexp)) {
     // Emulate RegExp.prototype.exec's side effect in step 5, even though
@@ -210,10 +196,8 @@ var reusableMatchInfo = [2, "", "", -1, -1];
 
 // ECMA-262, section 15.5.4.11
 function StringReplace(search, replace) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.replace"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.replace");
+
   var subject = TO_STRING_INLINE(this);
 
   // Decision tree for dispatch
@@ -543,10 +527,8 @@ function StringReplaceNonGlobalRegExpWithFunction(subject, regexp, replace) {
 
 // ECMA-262 section 15.5.4.12
 function StringSearch(re) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.search"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.search");
+
   var regexp;
   if (IS_STRING(re)) {
     regexp = %_GetFromCache(STRING_TO_REGEXP_CACHE_ID, re);
@@ -565,10 +547,8 @@ function StringSearch(re) {
 
 // ECMA-262 section 15.5.4.13
 function StringSlice(start, end) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.slice"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.slice");
+
   var s = TO_STRING_INLINE(this);
   var s_len = s.length;
   var start_i = TO_INTEGER(start);
@@ -609,10 +589,8 @@ function StringSlice(start, end) {
 
 // ECMA-262 section 15.5.4.14
 function StringSplit(separator, limit) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.split"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.split");
+
   var subject = TO_STRING_INLINE(this);
   limit = (IS_UNDEFINED(limit)) ? 0xffffffff : TO_UINT32(limit);
 
@@ -709,10 +687,8 @@ function StringSplitOnRegExp(subject, separator, limit, length) {
 
 // ECMA-262 section 15.5.4.15
 function StringSubstring(start, end) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.subString"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.subString");
+
   var s = TO_STRING_INLINE(this);
   var s_len = s.length;
 
@@ -744,10 +720,8 @@ function StringSubstring(start, end) {
 
 // This is not a part of ECMA-262.
 function StringSubstr(start, n) {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.substr"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.substr");
+
   var s = TO_STRING_INLINE(this);
   var len;
 
@@ -786,65 +760,51 @@ function StringSubstr(start, n) {
 
 // ECMA-262, 15.5.4.16
 function StringToLowerCase() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.toLowerCase"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.toLowerCase");
+
   return %StringToLowerCase(TO_STRING_INLINE(this));
 }
 
 
 // ECMA-262, 15.5.4.17
 function StringToLocaleLowerCase() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.toLocaleLowerCase"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.toLocaleLowerCase");
+
   return %StringToLowerCase(TO_STRING_INLINE(this));
 }
 
 
 // ECMA-262, 15.5.4.18
 function StringToUpperCase() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.toUpperCase"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.toUpperCase");
+
   return %StringToUpperCase(TO_STRING_INLINE(this));
 }
 
 
 // ECMA-262, 15.5.4.19
 function StringToLocaleUpperCase() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.toLocaleUpperCase"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.toLocaleUpperCase");
+
   return %StringToUpperCase(TO_STRING_INLINE(this));
 }
 
 // ES5, 15.5.4.20
 function StringTrim() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.trim"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.trim");
+
   return %StringTrim(TO_STRING_INLINE(this), true, true);
 }
 
 function StringTrimLeft() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.trimLeft"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.trimLeft");
+
   return %StringTrim(TO_STRING_INLINE(this), true, false);
 }
 
 function StringTrimRight() {
-  if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
-    throw MakeTypeError("called_on_null_or_undefined",
-                        ["String.prototype.trimRight"]);
-  }
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.trimRight");
+
   return %StringTrim(TO_STRING_INLINE(this), false, true);
 }
 

src/v8natives.js

@@ -1015,6 +1015,21 @@ function ObjectGetPrototypeOf(obj) {
   return %GetPrototype(obj);
 }
 
+// ES6 section 19.1.2.19.
+function ObjectSetPrototypeOf(obj, proto) {
+  CHECK_OBJECT_COERCIBLE(obj, "Object.setPrototypeOf");
+
+  if (proto !== null && !IS_SPEC_OBJECT(proto)) {
+    throw MakeTypeError("proto_object_or_null", [proto]);
+  }
+
+  if (IS_SPEC_OBJECT(obj)) {
+    %SetPrototype(obj, proto);
+  }
+
+  return obj;
+}
+
 
 // ES5 section 15.2.3.3
 function ObjectGetOwnPropertyDescriptor(obj, p) {
@@ -1443,6 +1458,7 @@ function SetUpObject() {
     "defineProperties", ObjectDefineProperties,
     "freeze", ObjectFreeze,
     "getPrototypeOf", ObjectGetPrototypeOf,
+    "setPrototypeOf", ObjectSetPrototypeOf,
     "getOwnPropertyDescriptor", ObjectGetOwnPropertyDescriptor,
     "getOwnPropertyNames", ObjectGetOwnPropertyNames,
     // getOwnPropertySymbols is added in symbol.js.

test/mjsunit/set-prototype-of.js

+// Copyright 2014 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --harmony-symbols
+
+
+function getObjects() {
+  function func() {}
+  return [
+    func,
+    new func(),
+    {x: 5},
+    /regexp/,
+    ['array'],
+    // new Error(),
+    new Date(),
+    new Number(1),
+    new Boolean(true),
+    new String('str'),
+    Object(Symbol())
+  ];
+}
+
+
+var coercibleValues = [
+  1,
+  true,
+  'string',
+  Symbol()
+];
+
+
+var nonCoercibleValues = [
+  undefined,
+  null
+];
+
+
+var valuesWithoutNull = coercibleValues.concat(undefined);
+
+
+function TestSetPrototypeOfCoercibleValues() {
+  for (var i = 0; i < coercibleValues.length; i++) {
+    var value = coercibleValues[i];
+    assertThrows(function() {
+      Object.getPrototypeOf(value);
+    }, TypeError);
+
+    assertEquals(Object.setPrototypeOf(value, {}), value);
+
+    assertThrows(function() {
+      Object.getPrototypeOf(value);
+    }, TypeError);
+  }
+}
+TestSetPrototypeOfCoercibleValues();
+
+
+function TestSetPrototypeOfNonCoercibleValues() {
+  for (var i = 0; i < nonCoercibleValues.length; i++) {
+    var value = nonCoercibleValues[i];
+    assertThrows(function() {
+      Object.setPrototypeOf(value, {});
+    }, TypeError);
+  }
+}
+TestSetPrototypeOfNonCoercibleValues();
+
+
+function TestSetPrototypeToNonObject(proto) {
+  var objects = getObjects();
+  for (var i = 0; i < objects.length; i++) {
+    var object = objects[i];
+    for (var j = 0; j < valuesWithoutNull.length; j++) {
+      var proto = valuesWithoutNull[j];
+      assertThrows(function() {
+        Object.setPrototypeOf(object, proto);
+      }, TypeError);
+    }
+  }
+}
+TestSetPrototypeToNonObject();
+
+
+function TestSetPrototypeOf(object, proto) {
+  assertEquals(Object.setPrototypeOf(object, proto), object);
+  assertEquals(Object.getPrototypeOf(object), proto);
+}
+
+
+function TestSetPrototypeOfForObjects() {
+  var objects1 = getObjects();
+  var objects2 = getObjects();
+  for (var i = 0; i < objects1.length; i++) {
+    for (var j = 0; j < objects2.length; j++) {
+      TestSetPrototypeOf(objects1[i], objects2[j]);
+    }
+  }
+}
+TestSetPrototypeOfForObjects();
+
+
+function TestSetPrototypeToNull() {
+  var objects = getObjects();
+  for (var i = 0; i < objects.length; i++) {
+    TestSetPrototypeOf(objects[i], null);
+  }
+}
+TestSetPrototypeToNull();
+
+
+function TestSetPrototypeOfNonExtensibleObject() {
+  var objects = getObjects();
+  var proto = {};
+  for (var i = 0; i < objects.length; i++) {
+    var object = objects[i];
+    Object.preventExtensions(object);
+    assertThrows(function() {
+      Object.setPrototypeOf(object, proto);
+    }, TypeError);
+  }
+}
+TestSetPrototypeOfNonExtensibleObject();
+
+
+function TestLookup() {
+  var object = {};
+  assertFalse('x' in object);
+  assertFalse('y' in object);
+
+  var oldProto = {
+    x: 'old x',
+    y: 'old y'
+  };
+  Object.setPrototypeOf(object, oldProto);
+  assertEquals(object.x, 'old x');
+  assertEquals(object.y, 'old y');
+
+  var newProto = {
+    x: 'new x'
+  };
+  Object.setPrototypeOf(object, newProto);
+  assertEquals(object.x, 'new x');
+  assertFalse('y' in object);
+}
+TestLookup();

test/webkit/Object-create-expected.txt

@@ -26,8 +26,8 @@ Test to ensure correct behaviour of Object.defineProperties
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS Object.create() threw exception TypeError: Object prototype may only be an Object or null.
-PASS Object.create('a string') threw exception TypeError: Object prototype may only be an Object or null.
+PASS Object.create() threw exception TypeError: Object prototype may only be an Object or null: undefined.
+PASS Object.create('a string') threw exception TypeError: Object prototype may only be an Object or null: a string.
 PASS Object.create({}, 'a string') threw exception TypeError: Property description must be an object: a.
 PASS Object.create(null, 'a string') threw exception TypeError: Property description must be an object: a.
 PASS JSON.stringify(Object.create(null,{property:{value:'foo', enumerable:true}, property2:{value:'foo', enumerable:true}})) is '{"property":"foo","property2":"foo"}'

test/webkit/fast/js/Object-getOwnPropertyNames-expected.txt

@@ -63,7 +63,7 @@ FAIL getSortedOwnPropertyNames(decodeURI) should be length,name. Was arguments,c
 FAIL getSortedOwnPropertyNames(decodeURIComponent) should be length,name. Was arguments,caller,length,name.
 FAIL getSortedOwnPropertyNames(encodeURI) should be length,name. Was arguments,caller,length,name.
 FAIL getSortedOwnPropertyNames(encodeURIComponent) should be length,name. Was arguments,caller,length,name.
-FAIL getSortedOwnPropertyNames(Object) should be create,defineProperties,defineProperty,freeze,getOwnPropertyDescriptor,getOwnPropertyNames,getPrototypeOf,isExtensible,isFrozen,isSealed,keys,length,name,preventExtensions,prototype,seal. Was arguments,caller,create,defineProperties,defineProperty,freeze,getOwnPropertyDescriptor,getOwnPropertyNames,getPrototypeOf,is,isExtensible,isFrozen,isSealed,keys,length,name,preventExtensions,prototype,seal.
+FAIL getSortedOwnPropertyNames(Object) should be create,defineProperties,defineProperty,freeze,getOwnPropertyDescriptor,getOwnPropertyNames,getPrototypeOf,isExtensible,isFrozen,isSealed,keys,length,name,preventExtensions,prototype,seal,setPrototypeOf. Was arguments,caller,create,defineProperties,defineProperty,freeze,getOwnPropertyDescriptor,getOwnPropertyNames,getPrototypeOf,is,isExtensible,isFrozen,isSealed,keys,length,name,preventExtensions,prototype,seal,setPrototypeOf.
 PASS getSortedOwnPropertyNames(Object.prototype) is ['__defineGetter__', '__defineSetter__', '__lookupGetter__', '__lookupSetter__', '__proto__', 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'toLocaleString', 'toString', 'valueOf']
 FAIL getSortedOwnPropertyNames(Function) should be length,name,prototype. Was arguments,caller,length,name,prototype.
 FAIL getSortedOwnPropertyNames(Function.prototype) should be apply,bind,call,constructor,length,name,toString. Was apply,arguments,bind,call,caller,constructor,length,name,toString.

test/webkit/fast/js/Object-getOwnPropertyNames.js

@@ -71,7 +71,7 @@ var expectedPropertyNamesSet = {
     "encodeURI": "['length', 'name']",
     "encodeURIComponent": "['length', 'name']",
 // Built-in ECMA objects
-    "Object": "['create', 'defineProperties', 'defineProperty', 'freeze', 'getOwnPropertyDescriptor', 'getOwnPropertyNames', 'getPrototypeOf', 'isExtensible', 'isFrozen', 'isSealed', 'keys', 'length', 'name', 'preventExtensions', 'prototype', 'seal']",
+    "Object": "['create', 'defineProperties', 'defineProperty', 'freeze', 'getOwnPropertyDescriptor', 'getOwnPropertyNames', 'getPrototypeOf', 'isExtensible', 'isFrozen', 'isSealed', 'keys', 'length', 'name', 'preventExtensions', 'prototype', 'seal', 'setPrototypeOf']",
     "Object.prototype": "['__defineGetter__', '__defineSetter__', '__lookupGetter__', '__lookupSetter__', '__proto__', 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'toLocaleString', 'toString', 'valueOf']",
     "Function": "['length', 'name', 'prototype']",
     "Function.prototype": "['apply', 'bind', 'call', 'constructor', 'length', 'name', 'toString']",