[Isolates] Merge 6700:7030 from bleeding_edge to isolates.

src/array.js

 // Copyright 2010 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 143 matching lines @@
         if (IS_NUMBER(e)) elements[i] = %_NumberToString(e);
         else {
           if (!IS_STRING(e)) e = convert(e);
           elements[i] = e;
         }
       }
     }   
     var result = %_FastAsciiArrayJoin(elements, separator);
     if (!IS_UNDEFINED(result)) return result;   
 
-    var length2 = (length << 1) - 1;
-    var j = length2;
-    var i = length;
-    elements[--j] = elements[--i];
-    while (i > 0) {
-      elements[--j] = separator;
-      elements[--j] = elements[--i];
-    }
-    return %StringBuilderConcat(elements, length2, '');    
+    return %StringBuilderJoin(elements, length, separator);
   } finally {
     // Make sure to remove the last element of the visited array no
     // matter what happens.
     if (is_array) visited_arrays.length = visited_arrays.length - 1;
   }
 }
 
 
 function ConvertToString(x) {
   // Assumes x is a non-string. 
@@ skipping 236 matching lines @@
   var m = %_ArgumentsLength();
   for (var i = 0; i < m; i++) {
     this[i+n] = %_Arguments(i);
   }
   this.length = n + m;
   return this.length;
 }
 
 
 function ArrayConcat(arg1) {  // length == 1
-  // TODO: can we just use arguments?
   var arg_count = %_ArgumentsLength();
   var arrays = new $Array(1 + arg_count);
   arrays[0] = this;
   for (var i = 0; i < arg_count; i++) {
     arrays[i + 1] = %_Arguments(i);
   }
 
   return %ArrayConcat(arrays);
 }
 
@@ skipping 579 matching lines @@
     index = TO_INTEGER(index);
     // If index is negative, index from the end of the array.
     if (index < 0) {
       index = length + index;
       // If index is still negative, search the entire array.
       if (index < 0) index = 0;
     }
   }
   var min = index;
   var max = length;
-  if (UseSparseVariant(this, length, true)) {
+  if (UseSparseVariant(this, length, IS_ARRAY(this))) {
     var intervals = %GetArrayKeys(this, length);
     if (intervals.length == 2 && intervals[0] < 0) {
       // A single interval.
       var intervalMin = -(intervals[0] + 1);
       var intervalMax = intervalMin + intervals[1];
-      min = MAX(min, intervalMin);
+      if (min < intervalMin) min = intervalMin;
       max = intervalMax;  // Capped by length already.
       // Fall through to loop below.
     } else {
       if (intervals.length == 0) return -1;
       // Get all the keys in sorted order.
       var sortedKeys = GetSortedArrayKeys(this, intervals);
       var n = sortedKeys.length;
       var i = 0;
       while (i < n && sortedKeys[i] < index) i++;
       while (i < n) {
@@ skipping 29 matching lines @@
   } else {
     index = TO_INTEGER(index);
     // If index is negative, index from end of the array.
     if (index < 0) index += length;
     // If index is still negative, do not search the array.
     if (index < 0) return -1;
     else if (index >= length) index = length - 1;
   }
   var min = 0;
   var max = index;
-  if (UseSparseVariant(this, length, true)) {
+  if (UseSparseVariant(this, length, IS_ARRAY(this))) {
     var intervals = %GetArrayKeys(this, index + 1);
     if (intervals.length == 2 && intervals[0] < 0) {
       // A single interval.
       var intervalMin = -(intervals[0] + 1);
       var intervalMax = intervalMin + intervals[1];
-      min = MAX(min, intervalMin);
+      if (min < intervalMin) min = intervalMin;
       max = intervalMax;  // Capped by index already.
       // Fall through to loop below.
     } else {
       if (intervals.length == 0) return -1;
       // Get all the keys in sorted order.
       var sortedKeys = GetSortedArrayKeys(this, intervals);
       var i = sortedKeys.length - 1;
       while (i >= 0) {
         var key = sortedKeys[i];
         if (!IS_UNDEFINED(key) && this[key] === element) return key;
@@ skipping 129 matching lines @@
     "lastIndexOf", getFunction("lastIndexOf", ArrayLastIndexOf, 1),
     "reduce", getFunction("reduce", ArrayReduce, 1),
     "reduceRight", getFunction("reduceRight", ArrayReduceRight, 1)
   ));
 
   %FinishArrayPrototypeSetup($Array.prototype);
 }
 
 
 SetupArray();