- Added %IsArrayClass, %IsDateClass, and %IsStringClass....

src/runtime.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 34 matching lines @@
 const $Array = global.Array;
 const $String = global.String;
 const $Number = global.Number;
 const $Function = global.Function;
 const $Boolean = global.Boolean;
 const $NaN = 0/0;
 
 
 // ECMA-262, section 11.9.1, page 55.
 function EQUALS(y) {
+  if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y);
   var x = this;
 
   // NOTE: We use iteration instead of recursion, because it is
   // difficult to call EQUALS with the correct setting of 'this' in
   // an efficient way.
-
   while (true) {
-
     if (IS_NUMBER(x)) {
       if (y == null) return 1;  // not equal
       return %NumberEquals(x, %ToNumber(y));
-
     } else if (IS_STRING(x)) {
       if (IS_STRING(y)) return %StringEquals(x, y);
       if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y);
       if (IS_BOOLEAN(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y));
       if (y == null) return 1;  // not equal
       y = %ToPrimitive(y, NO_HINT);
-
     } else if (IS_BOOLEAN(x)) {
       if (IS_BOOLEAN(y)) {
         return %_ObjectEquals(x, y) ? 0 : 1;
       }
       if (y == null) return 1;  // not equal
       return %NumberEquals(%ToNumber(x), %ToNumber(y));
-
     } else if (x == null) {
       // NOTE: This checks for both null and undefined.
       return (y == null) ? 0 : 1;
-
     } else {
       if (IS_OBJECT(y)) {
         return %_ObjectEquals(x, y) ? 0 : 1;
       }
       if (IS_FUNCTION(y)) {
         return %_ObjectEquals(x, y) ? 0 : 1;
       }
       x = %ToPrimitive(x, NO_HINT);
-
     }
   }
 }
 
-
 // ECMA-262, section 11.9.4, page 56.
 function STRICT_EQUALS(x) {
   if (IS_NUMBER(this)) {
     if (!IS_NUMBER(x)) return 1;  // not equal
     return %NumberEquals(this, x);
   }
 
   if (IS_STRING(this)) {
     if (!IS_STRING(x)) return 1;  // not equal
     return %StringEquals(this, x);
   }
 
   if (IS_BOOLEAN(this)) {
     if (!IS_BOOLEAN(x)) return 1;  // not equal
     if (this) return x ? 0 : 1;
     else return x ? 1 : 0;
   }
 
   if (IS_UNDEFINED(this)) {  // both undefined and undetectable
     return IS_UNDEFINED(x) ? 0 : 1;
   }
 
   return %_ObjectEquals(this, x) ? 0 : 1;
 }
 
 
 // ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as
 // the result when either (or both) the operands are NaN.
 function COMPARE(x, ncr) {
-  // Improve performance for floating point compares
+  // Fast case for numbers and strings.
   if (IS_NUMBER(this) && IS_NUMBER(x)) {
     return %NumberCompare(this, x, ncr);
   }
+  if (IS_STRING(this) && IS_STRING(x)) {
+    return %StringCompare(this, x);
+  }
 
+  // Default implementation.
   var a = %ToPrimitive(this, NUMBER_HINT);
   var b = %ToPrimitive(x, NUMBER_HINT);
   if (IS_STRING(a) && IS_STRING(b)) {
     return %StringCompare(a, b);
   } else {
     return %NumberCompare(%ToNumber(a), %ToNumber(b), ncr);
   }
 }
 
 
 
 /* -----------------------------------
    - - -   A r i t h m e t i c   - - -
    -----------------------------------
 */
 
 // ECMA-262, section 11.6.1, page 50.
 function ADD(x) {
   // Fast case: Check for number operands and do the addition.
-  if (IS_NUMBER(this) && IS_NUMBER(x)) {
-    return %NumberAdd(this, x);
-  }
+  if (IS_NUMBER(this) && IS_NUMBER(x)) return %NumberAdd(this, x);
+  if (IS_STRING(this) && IS_STRING(x)) return %StringAdd(this, x);
 
+  // Default implementation.
   var a = %ToPrimitive(this, NO_HINT);
   var b = %ToPrimitive(x, NO_HINT);
   
   if (IS_STRING(a)) {
     return %StringAdd(a, %ToString(b));
   } else if (IS_STRING(b)) {
     return %StringAdd(%ToString(a), b);
   } else {
     return %NumberAdd(%ToNumber(a), %ToNumber(b));
   }
@@ skipping 224 matching lines @@
 
 
 /* -------------------------------------
    - - -   C o n v e r s i o n s   - - -
    -------------------------------------
 */
 
 // ECMA-262, section 9.1, page 30. Use null/undefined for no hint,
 // (1) for number hint, and (2) for string hint.
 function ToPrimitive(x, hint) {
+  // Fast case check.
+  if (IS_STRING(x)) return x;
+  if ((hint != NUMBER_HINT) && %IsStringClass(x)) return %_ValueOf(x);
+  // Normal behaior.
   if (!IS_OBJECT(x) && !IS_FUNCTION(x)) return x;
   if (x == null) return x;  // check for null, undefined
   if (hint == NO_HINT) hint = (IS_DATE(x)) ? STRING_HINT : NUMBER_HINT;
   return (hint == NUMBER_HINT) ? %DefaultNumber(x) : %DefaultString(x);
 }
 
 
 // ECMA-262, section 9.3, page 31.
 function ToNumber(x) {
   if (IS_NUMBER(x)) return x;
@@ skipping 105 matching lines @@
   throw %MakeTypeError('cannot_convert_to_primitive', []);
 }
 
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essiential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));