Added Object.defineProperty + needed internal functionality:...

src/runtime.js

Index: src/runtime.js
===================================================================
--- src/runtime.js	(revision 3785)
+++ src/runtime.js	(working copy)
@@ -506,6 +506,16 @@
 }
 
 
+// ECMA-262, section 9.2, page 30
+function ToBoolean(x) {
+  if (IS_BOOLEAN(x)) return x;
+  if (IS_STRING(x)) return x.length != 0;
+  if (x == null) return false;
+  if (IS_NUMBER(x)) return !((x == 0) || NUMBER_IS_NAN(x));
+  return true;
+}
+
+
 // ECMA-262, section 9.3, page 31.
 function ToNumber(x) {
   if (IS_NUMBER(x)) return x;
@@ -526,16 +536,6 @@
 }
 
 
-// ... where did this come from?
-function ToBoolean(x) {
-  if (IS_BOOLEAN(x)) return x;
-  if (IS_STRING(x)) return x.length != 0;
-  if (x == null) return false;
-  if (IS_NUMBER(x)) return !((x == 0) || NUMBER_IS_NAN(x));
-  return true;
-}
-
-
 // ECMA-262, section 9.9, page 36.
 function ToObject(x) {
   if (IS_STRING(x)) return new $String(x);
@@ -569,7 +569,26 @@
 }
 
 
+// ES5, section 9.12
+function SameValue(x, y) {
+  if (typeof x != typeof y) return false;
+  if (IS_NULL_OR_UNDEFINED(x)) return true;
+  if (IS_NUMBER(x)) {
+    if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true;
+    // x is +0 and y is -0 or vice versa
+    if (x === 0 && y === 0 && !%_IsSmi(x) && !%_IsSmi(y) && 
+        ((1 / x < 0 && 1 / y > 0) || (1 / x > 0 && 1 / y < 0))) {
+      return false;
+    }
+    return x == y;    
+  }
+  if (IS_STRING(x)) return %StringEquals(x, y);
+  if (IS_BOOLEAN(x))return %NumberEquals(%ToNumber(x),%ToNumber(y));
 
+  return %_ObjectEquals(x, y);
+}
+
+
 /* ---------------------------------
    - - -   U t i l i t i e s   - - -
    ---------------------------------