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

src/math.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 113 matching lines @@
     if (!IS_NUMBER(arg1)) arg1 = NonNumberToNumber(arg1);
     if (!IS_NUMBER(arg2)) arg2 = NonNumberToNumber(arg2);
     if (arg2 > arg1) return arg2;
     if (arg1 > arg2) return arg1;
     if (arg1 == arg2) {
       // Make sure -0 is considered less than +0.  -0 is never a Smi, +0 can be
       // a Smi or a heap number.
       return (arg1 == 0 && !%_IsSmi(arg1) && 1 / arg1 < 0) ? arg2 : arg1;
     }
     // All comparisons failed, one of the arguments must be NaN.
-    return 0/0;  // Compiler constant-folds this to NaN.
+    return NAN;
   }
-  var r = -1/0;  // Compiler constant-folds this to -Infinity.
+  var r = -INFINITY;
   for (var i = 0; i < length; i++) {
     var n = %_Arguments(i);
     if (!IS_NUMBER(n)) n = NonNumberToNumber(n);
     // Make sure +0 is considered greater than -0.  -0 is never a Smi, +0 can be
     // a Smi or heap number.
     if (NUMBER_IS_NAN(n) || n > r ||
         (r == 0 && n == 0 && !%_IsSmi(r) && 1 / r < 0)) {
       r = n;
     }
   }
   return r;
 }
 
 // ECMA 262 - 15.8.2.12
 function MathMin(arg1, arg2) {  // length == 2
   var length = %_ArgumentsLength();
   if (length == 2) {
     if (!IS_NUMBER(arg1)) arg1 = NonNumberToNumber(arg1);
     if (!IS_NUMBER(arg2)) arg2 = NonNumberToNumber(arg2);
     if (arg2 > arg1) return arg1;
     if (arg1 > arg2) return arg2;
     if (arg1 == arg2) {
       // Make sure -0 is considered less than +0.  -0 is never a Smi, +0 can be
       // a Smi or a heap number.
       return (arg1 == 0 && !%_IsSmi(arg1) && 1 / arg1 < 0) ? arg1 : arg2;
     }
     // All comparisons failed, one of the arguments must be NaN.
-    return 0/0;  // Compiler constant-folds this to NaN.
+    return NAN;
   }
-  var r = 1/0;  // Compiler constant-folds this to Infinity.
+  var r = INFINITY;
   for (var i = 0; i < length; i++) {
     var n = %_Arguments(i);
     if (!IS_NUMBER(n)) n = NonNumberToNumber(n);
     // Make sure -0 is considered less than +0.  -0 is never a Smi, +0 can be a
     // Smi or a heap number.
     if (NUMBER_IS_NAN(n) || n < r ||
         (r == 0 && n == 0 && !%_IsSmi(n) && 1 / n < 0)) {
       r = n;
     }
   }
@@ skipping 112 matching lines @@
     "tan", MathTan,
     "atan2", MathAtan2,
     "pow", MathPow,
     "max", MathMax,
     "min", MathMin,
     "imul", MathImul
   ));
 }
 
 SetUpMath();