- Specialized IsClassOf for Number, Boolean, Arguments, and Function.

src/v8natives.js

 // Copyright 2006-2008 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 274 matching lines @@
 
 SetupObject();
 
 
 // ----------------------------------------------------------------------------
 // Boolean
 
 function BooleanToString() {
   // NOTE: Both Boolean objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
-  if (!IS_BOOLEAN(this) && %ClassOf(this) !== 'Boolean')
+  if (!IS_BOOLEAN(this) && !%IsBooleanClass(this))
     throw new $TypeError('Boolean.prototype.toString is not generic');
   return ToString(%_ValueOf(this));
 }
 
 
 function BooleanValueOf() {
   // NOTE: Both Boolean objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
-  if (!IS_BOOLEAN(this) && %ClassOf(this) !== 'Boolean')
+  if (!IS_BOOLEAN(this) && !%IsBooleanClass(this))
     throw new $TypeError('Boolean.prototype.valueOf is not generic');
   return %_ValueOf(this);
 }
 
 
 // ----------------------------------------------------------------------------
 
 
 function SetupBoolean() {
   InstallFunctions($Boolean.prototype, DONT_ENUM, $Array(
@@ skipping 18 matching lines @@
 });
 
 %FunctionSetPrototype($Number, new $Number(0));
 
 // ECMA-262 section 15.7.4.2.
 function NumberToString(radix) {
   // NOTE: Both Number objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
   var number = this;
   if (!IS_NUMBER(this)) {
-    if (%ClassOf(this) !== 'Number')
+    if (!%IsNumberClass(this))
       throw new $TypeError('Number.prototype.toString is not generic');
     // Get the value of this number in case it's an object.
     number = %_ValueOf(this);
   }
   // Fast case: Convert number in radix 10.
   if (IS_UNDEFINED(radix) || radix === 10) {
     return ToString(number);
   }
 
   // Convert the radix to an integer and check the range.
   radix = TO_INTEGER(radix);
   if (radix < 2 || radix > 36) {
     throw new $RangeError('toString() radix argument must be between 2 and 36');
   }
   // Convert the number to a string in the given radix.
   return %NumberToRadixString(number, radix);
 }
 
 
 // ECMA-262 section 15.7.4.3
 function NumberToLocaleString() {
   return this.toString();
 }
 
 
 // ECMA-262 section 15.7.4.4
 function NumberValueOf() {
   // NOTE: Both Number objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
-  if (!IS_NUMBER(this) && %ClassOf(this) !== 'Number')
+  if (!IS_NUMBER(this) && !%IsNumberClass(this))
     throw new $TypeError('Number.prototype.valueOf is not generic');
   return %_ValueOf(this);
 }
 
 
 // ECMA-262 section 15.7.4.5
 function NumberToFixed(fractionDigits) {
   var f = TO_INTEGER(fractionDigits);
   if (f < 0 || f > 20) {
     throw new $RangeError("toFixed() digits argument must be between 0 and 20");
@@ skipping 75 matching lines @@
 
 
 // ----------------------------------------------------------------------------
 // Function
 
 $Function.prototype.constructor = $Function;
 
 function FunctionSourceString(func) {
   // NOTE: Both Function objects and values can enter here as
   // 'func'. This is not as dictated by ECMA-262.
-  if (!IS_FUNCTION(func) && %ClassOf(func) != 'Function')
+  if (!IS_FUNCTION(func) && !%IsFunctionClass(func))
     throw new $TypeError('Function.prototype.toString is not generic');
 
   var source = %FunctionGetSourceCode(func);
   if (!IS_STRING(source)) {
     var name = %FunctionGetName(func);
     if (name) {
       // Mimic what KJS does.
       return 'function ' + name + '() { [native code] }';
     } else {
       return 'function () { [native code] }';
@@ skipping 46 matching lines @@
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();