From 8db908784e5592de1c844d4947bcf6e55c6fefe3 Mon Sep 17 00:00:00 2001
From: "verwaest@chromium.org"
 <verwaest@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Fri, 9 May 2014 16:37:04 +0000
Subject: [PATCH] Array Iterator prototype should not have a constructor.

BUG=v8:3293
LOG=Y
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/258793005

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21234 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/array-iterator.js                  | 15 ++++++++++---
 test/mjsunit/harmony/array-iterator.js | 41 +++++++++++++++++++++++++---------
 2 files changed, 43 insertions(+), 13 deletions(-)

diff --git a/src/array-iterator.js b/src/array-iterator.js
index 10116b1..37f098a 100644
--- a/src/array-iterator.js
+++ b/src/array-iterator.js
@@ -27,16 +27,20 @@
 
 'use strict';
 
+
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
+
 var arrayIteratorObjectSymbol = GLOBAL_PRIVATE("ArrayIterator#object");
 var arrayIteratorNextIndexSymbol = GLOBAL_PRIVATE("ArrayIterator#next");
 var arrayIterationKindSymbol = GLOBAL_PRIVATE("ArrayIterator#kind");
 
+
 function ArrayIterator() {}
 
+
 // 15.4.5.1 CreateArrayIterator Abstract Operation
 function CreateArrayIterator(array, kind) {
   var object = ToObject(array);
@@ -47,11 +51,13 @@ function CreateArrayIterator(array, kind) {
   return iterator;
 }
 
+
 // 15.19.4.3.4 CreateItrResultObject
 function CreateIteratorResultObject(value, done) {
   return {value: value, done: done};
 }
 
+
 // 15.4.5.2.2 ArrayIterator.prototype.next( )
 function ArrayIteratorNext() {
   var iterator = ToObject(this);
@@ -83,31 +89,35 @@ function ArrayIteratorNext() {
   return CreateIteratorResultObject(index, false);
 }
 
+
 function ArrayEntries() {
   return CreateArrayIterator(this, ITERATOR_KIND_ENTRIES);
 }
 
+
 function ArrayValues() {
   return CreateArrayIterator(this, ITERATOR_KIND_VALUES);
 }
 
+
 function ArrayKeys() {
   return CreateArrayIterator(this, ITERATOR_KIND_KEYS);
 }
 
+
 function SetUpArrayIterator() {
   %CheckIsBootstrapping();
 
+  %FunctionSetPrototype(ArrayIterator, new $Object());
   %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator');
-  %FunctionSetReadOnlyPrototype(ArrayIterator);
 
   InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array(
     'next', ArrayIteratorNext
   ));
 }
-
 SetUpArrayIterator();
 
+
 function ExtendArrayPrototype() {
   %CheckIsBootstrapping();
 
@@ -117,5 +127,4 @@ function ExtendArrayPrototype() {
     'keys', ArrayKeys
   ));
 }
-
 ExtendArrayPrototype();
diff --git a/test/mjsunit/harmony/array-iterator.js b/test/mjsunit/harmony/array-iterator.js
index 6a402e7..cbe3b14 100644
--- a/test/mjsunit/harmony/array-iterator.js
+++ b/test/mjsunit/harmony/array-iterator.js
@@ -27,6 +27,7 @@
 
 // Flags: --harmony-iteration --allow-natives-syntax
 
+
 function TestArrayPrototype() {
   assertTrue(Array.prototype.hasOwnProperty('entries'));
   assertTrue(Array.prototype.hasOwnProperty('values'));
@@ -38,10 +39,12 @@ function TestArrayPrototype() {
 }
 TestArrayPrototype();
 
+
 function assertIteratorResult(value, done, result) {
   assertEquals({value: value, done: done}, result);
 }
 
+
 function TestValues() {
   var array = ['a', 'b', 'c'];
   var iterator = array.values();
@@ -55,6 +58,7 @@ function TestValues() {
 }
 TestValues();
 
+
 function TestValuesMutate() {
   var array = ['a', 'b', 'c'];
   var iterator = array.values();
@@ -67,6 +71,7 @@ function TestValuesMutate() {
 }
 TestValuesMutate();
 
+
 function TestKeys() {
   var array = ['a', 'b', 'c'];
   var iterator = array.keys();
@@ -80,6 +85,7 @@ function TestKeys() {
 }
 TestKeys();
 
+
 function TestKeysMutate() {
   var array = ['a', 'b', 'c'];
   var iterator = array.keys();
@@ -92,6 +98,7 @@ function TestKeysMutate() {
 }
 TestKeysMutate();
 
+
 function TestEntries() {
   var array = ['a', 'b', 'c'];
   var iterator = array.entries();
@@ -105,6 +112,7 @@ function TestEntries() {
 }
 TestEntries();
 
+
 function TestEntriesMutate() {
   var array = ['a', 'b', 'c'];
   var iterator = array.entries();
@@ -117,29 +125,40 @@ function TestEntriesMutate() {
 }
 TestEntriesMutate();
 
+
+function TestArrayIteratorPrototype() {
+  var ArrayIteratorPrototype = [].values().__proto__;
+  assertFalse(ArrayIteratorPrototype.hasOwnProperty('constructor'));
+  assertEquals(ArrayIteratorPrototype.__proto__, Object.prototype);
+  assertArrayEquals(['next'],
+      Object.getOwnPropertyNames(ArrayIteratorPrototype));
+}
+TestArrayIteratorPrototype();
+
+
 function TestArrayIteratorPrototype() {
   var array = [];
   var iterator = array.values();
 
-  var ArrayIterator = iterator.constructor;
-  assertEquals(ArrayIterator.prototype, array.values().__proto__);
-  assertEquals(ArrayIterator.prototype, array.keys().__proto__);
-  assertEquals(ArrayIterator.prototype, array.entries().__proto__);
+  var ArrayIteratorPrototype = iterator.__proto__;
 
-  assertEquals(Object.prototype, ArrayIterator.prototype.__proto__);
+  assertEquals(ArrayIteratorPrototype, array.values().__proto__);
+  assertEquals(ArrayIteratorPrototype, array.keys().__proto__);
+  assertEquals(ArrayIteratorPrototype, array.entries().__proto__);
+
+  assertEquals(Object.prototype, ArrayIteratorPrototype.__proto__);
 
   assertEquals('Array Iterator', %_ClassOf(array.values()));
   assertEquals('Array Iterator', %_ClassOf(array.keys()));
   assertEquals('Array Iterator', %_ClassOf(array.entries()));
 
-  var prototypeDescriptor =
-      Object.getOwnPropertyDescriptor(ArrayIterator, 'prototype');
-  assertFalse(prototypeDescriptor.configurable);
-  assertFalse(prototypeDescriptor.enumerable);
-  assertFalse(prototypeDescriptor.writable);
+  assertFalse(ArrayIteratorPrototype.hasOwnProperty('constructor'));
+  assertArrayEquals(['next'],
+      Object.getOwnPropertyNames(ArrayIteratorPrototype));
 }
 TestArrayIteratorPrototype();
 
+
 function TestForArrayValues() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
@@ -157,6 +176,7 @@ function TestForArrayValues() {
 }
 TestForArrayValues();
 
+
 function TestForArrayKeys() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
@@ -173,6 +193,7 @@ function TestForArrayKeys() {
 }
 TestForArrayKeys();
 
+
 function TestForArrayEntries() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
-- 
2.7.4