[key-accumulator] Starting to reimplement the key-accumulator

test/mjsunit/for-in.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
@@ skipping 102 matching lines @@
 
   assertEquals(5, y.foo, "y.foo");
   assertEquals("undefined", typeof y.bar, "y.bar");
   assertEquals(7, y.zip, "y.zip");
   assertEquals(9, y.glep, "y.glep");
   assertEquals(11, y[10], "y[10]");
   assertEquals("undefined", typeof y[2], "y[2]");
   assertEquals("undefined", typeof y[0], "y[0]");
 }
 
-(function() {
+(function testLargeElementKeys() {
+  // Key out of SMI range but well within safe double representaion.
+  var large_key = 2147483650;
+  var o = [];
+  // Trigger dictionary elements with HeapNumber keys.
+  o[large_key] = 0;
+  o[large_key+1] = 1;
+  o[large_key+2] = 2;
+  o[large_key+3] = 3;
+  var keys = [];
+  for (var k in o) {
+    keys.push(k);
+  }
+  assertEquals(["2147483650", "2147483651", "2147483652", "2147483653"], keys);
+})();
+
+(function testLargeElementKeysWithProto() {
   var large_key = 2147483650;
   var o = {__proto__: {}};
   o[large_key] = 1;
   o.__proto__[large_key] = 1;
   var keys = [];
   for (var k in o) {
     keys.push(k);
   }
   assertEquals(["2147483650"], keys);
 })();
+
+(function testNonEnumerableArgumentsIndex() {
+  Object.defineProperty(arguments, 0, {enumerable:false});
+  for (var k in arguments) {
+    assertUnreachable();
+  }
+})();
+
+(function testNonEnumerableSloppyArgumentsIndex(a) {
+  Object.defineProperty(arguments, 0, {enumerable:false});
+  for (var k in arguments) {
+    assertUnreachable();
+  }
+})(true);