Cosmetic: Add macros for NaN, undefined and Infinity to native js code.

src/array.js

 // Copyright 2012 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 659 matching lines @@
 function ArraySlice(start, end) {
   if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
     throw MakeTypeError("called_on_null_or_undefined",
                         ["Array.prototype.slice"]);
   }
 
   var len = TO_UINT32(this.length);
   var start_i = TO_INTEGER(start);
   var end_i = len;
 
-  if (end !== void 0) end_i = TO_INTEGER(end);
+  if (!IS_UNDEFINED(end)) end_i = TO_INTEGER(end);
 
   if (start_i < 0) {
     start_i += len;
     if (start_i < 0) start_i = 0;
   } else {
     if (start_i > len) start_i = len;
   }
 
   if (end_i < 0) {
     end_i += len;
@@ skipping 318 matching lines @@
   // where a prototype of obj has an element. I.e., shadow all prototype
   // elements in that range.
   var ShadowPrototypeElements = function(obj, from, to) {
     for (var proto = %GetPrototype(obj); proto; proto = %GetPrototype(proto)) {
       var indices = %GetArrayKeys(proto, to);
       if (IS_NUMBER(indices)) {
         // It's an interval.
         var proto_length = indices;
         for (var i = from; i < proto_length; i++) {
           if (proto.hasOwnProperty(i)) {
-            obj[i] = void 0;
+            obj[i] = UNDEFINED;
           }
         }
       } else {
         for (var i = 0; i < indices.length; i++) {
           var index = indices[i];
           if (!IS_UNDEFINED(index) && from <= index &&
               proto.hasOwnProperty(index)) {
-            obj[index] = void 0;
+            obj[index] = UNDEFINED;
           }
         }
       }
     }
   };
 
   var SafeRemoveArrayHoles = function SafeRemoveArrayHoles(obj) {
     // Copy defined elements from the end to fill in all holes and undefineds
     // in the beginning of the array.  Write undefineds and holes at the end
     // after loop is finished.
@@ skipping 16 matching lines @@
       while (first_undefined < last_defined &&
              IS_UNDEFINED(obj[last_defined])) {
         if (!obj.hasOwnProperty(last_defined)) {
           num_holes++;
         }
         last_defined--;
       }
       if (first_undefined < last_defined) {
         // Fill in hole or undefined.
         obj[first_undefined] = obj[last_defined];
-        obj[last_defined] = void 0;
+        obj[last_defined] = UNDEFINED;
       }
     }
     // If there were any undefineds in the entire array, first_undefined
     // points to one past the last defined element.  Make this true if
     // there were no undefineds, as well, so that first_undefined == number
     // of defined elements.
     if (!IS_UNDEFINED(obj[first_undefined])) first_undefined++;
     // Fill in the undefineds and the holes.  There may be a hole where
     // an undefined should be and vice versa.
     var i;
     for (i = first_undefined; i < length - num_holes; i++) {
-      obj[i] = void 0;
+      obj[i] = UNDEFINED;
     }
     for (i = length - num_holes; i < length; i++) {
       // For compatability with Webkit, do not expose elements in the prototype.
       if (i in %GetPrototype(obj)) {
-        obj[i] = void 0;
+        obj[i] = UNDEFINED;
       } else {
         delete obj[i];
       }
     }
 
     // Return the number of defined elements.
     return first_undefined;
   };
 
   var length = TO_UINT32(this.length);
@@ skipping 560 matching lines @@
   ));
 
   SetUpLockedPrototype(InternalPackedArray, $Array(), $Array(
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush)
   ));
 }
 
 SetUpArray();