Builtin function EQULAS partially rewritten in C++. Control branches that cal...

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 r = %FastEquals(this, y);
+  if (r <= 1) return r;
   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
+    if (r == EQUALS_SECOND_ARG_TO_DEFAULT_VALUE) {
+      x = %ToNumber(x);
+      y = %ToNumber(%DefaultNumber(y));
+      return %NumberEquals(x, y);
+    } else if (r == EQUALS_SECOND_ARG_TO_PRIMITIVE) {
       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 {
-      // x is not a number, boolean, null or undefined.
-      if (y == null) return 1;  // not equal
-      if (IS_OBJECT(y)) {
-        return %_ObjectEquals(x, y) ? 0 : 1;
-      }
-      if (IS_FUNCTION(y)) {
-        return %_ObjectEquals(x, y) ? 0 : 1;
-      }
+      // retry
+    } else if (r == EQUALS_FIRST_ARG_TO_PRIMITIVE) {
+      x = %ToPrimitive(x, NO_HINT);
+      // retry
+    }
 
-      x = %ToPrimitive(x, NO_HINT);
-    }
+    var r = %FastEquals(x, y);
+    if (r <= 1) return r;
   }
 }
 
 // ECMA-262, section 11.9.4, page 56.
 function STRICT_EQUALS(x) {
   if (IS_STRING(this)) {
     if (!IS_STRING(x)) return 1;  // not equal
     return %StringEquals(this, x);
   }
 
@@ skipping 537 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));