Change the enumeration order for unsigned integer keys to always be...

test/mjsunit/enumeration-order.js

 // Copyright 2008 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.
 
 function check_enumeration_order(obj)  {
-  var value = 0; 
+  var value = 0;
   for (var name in obj) assertTrue(value < obj[name]);
   value = obj[name];
 }
 
 function make_object(size)  {
   var a = new Object();
-  
+
   for (var i = 0; i < size; i++) a["a_" + i] = i + 1;
   check_enumeration_order(a);
-  
+
   for (var i = 0; i < size; i +=3) delete a["a_" + i];
   check_enumeration_order(a);
 }
 
 // Validate the enumeration order for object up to 100 named properties.
 for (var j = 1; j< 100; j++) make_object(j);
 
 
 function make_literal_object(size)  {
   var code = "{ ";
   for (var i = 0; i < size-1; i++) code += " a_" + i + " : " + (i + 1) + ", ";
   code += "a_" + (size - 1) + " : " + size;
   code += " }";
   eval("var a = " + code);
-  check_enumeration_order(a);  
+  check_enumeration_order(a);
 }
 
 // Validate the enumeration order for object literals up to 100 named properties.

[Kasper Lund, 2009/04/16 11:22:04]

Long line. Not your fault.

 for (var j = 1; j< 100; j++) make_literal_object(j);
 
+// We enumerate indexed properties in numerical order followed by
+// named properties in insertion order, followed by indexed properties
+// of the prototype object in numerical order, followed by named
+// properties of the prototype object in insertion order, and so on.
+//
+// This enumeration order is not required by the specification, so
+// this just documents our choice.
+var proto2 = {};
+proto2[140000] = 0;
+proto2.a = 0;
+proto2[2] = 0;
+proto2[3] = 0;  // also on the 'proto1' object
+proto2.b = 0;
+proto2[4294967295] = 0;
+proto2.c = 0;
+proto2[4294967296] = 0;
+
+var proto1 = {};
+proto1[5] = 0;
+proto1.d = 0;
+proto1[3] = 0;
+proto1.e = 0;
+proto1.f = 0;  // also on the 'o' object
+
+var o = {};
+o[-23] = 0;
+o[300000000000] = 0;
+o[23] = 0;
+o.f = 0;
+o.g = 0;
+o[-4] = 0;
+o[42] = 0;
+
+o.__proto__ = proto1;
+proto1.__proto__ = proto2;
+
+var expected = ['23', '42',  // indexed from 'o'
+                '-23', '300000000000', 'f', 'g', '-4',  // named from 'o'
+                '3', '5',  // indexed from 'proto1'
+                'd', 'e',  // named from 'proto1'
+                '2', '140000', '4294967295',  // indexed from 'proto2'
+                'a', 'b', 'c', '4294967296'];  // named from 'proto2'
+var actual = [];
+for (var p in o) actual.push(p);
+assertArrayEquals(expected, actual);
+
+
+
+