Implement sealing, freezing, and related functions for proxies.

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 53a03173b3830731db7fb0ad02aa5ac7108fefdc..9843635866323d5c5495edf0ffbdb9d12400f01e 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -663,7 +663,8 @@ function DefineProxyProperty(obj, p, attributes, should_throw) {
   var result = %_CallFunction(handler, p, attributes, defineProperty);
   if (!ToBoolean(result)) {
     if (should_throw) {
-      throw MakeTypeError("handler_failed", [handler, "defineProperty"]);
+      throw MakeTypeError("handler_returned_false",
+                          [handler, "defineProperty"]);
     } else {
       return false;
     }
@@ -1020,11 +1021,30 @@ function ObjectDefineProperties(obj, properties) {
 }
 
 
+// Harmony proxies.
+function ProxyFix(obj) {
+  var handler = %GetHandler(obj);
+  var fix = handler.fix;
+  if (IS_UNDEFINED(fix)) {
+    throw MakeTypeError("handler_trap_missing", [handler, "fix"]);
+  }
+  var props = %_CallFunction(handler, fix);
+  if (IS_UNDEFINED(props)) {
+    throw MakeTypeError("handler_returned_undefined", [handler, "fix"]);
+  }
+  %Fix(obj);
+  ObjectDefineProperties(obj, props);
+}
+
+
 // ES5 section 15.2.3.8.
 function ObjectSeal(obj) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["seal"]);
   }
+  if (%IsJSProxy(obj)) {
+    ProxyFix(obj);
+  }
   var names = ObjectGetOwnPropertyNames(obj);
   for (var i = 0; i < names.length; i++) {
     var name = names[i];
@@ -1034,7 +1054,8 @@ function ObjectSeal(obj) {
       DefineOwnProperty(obj, name, desc, true);
     }
   }
-  return ObjectPreventExtension(obj);
+  %PreventExtensions(obj);
+  return obj;
 }
 
 
@@ -1043,6 +1064,9 @@ function ObjectFreeze(obj) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["freeze"]);
   }
+  if (%IsJSProxy(obj)) {
+    ProxyFix(obj);
+  }
   var names = ObjectGetOwnPropertyNames(obj);
   for (var i = 0; i < names.length; i++) {
     var name = names[i];
@@ -1053,7 +1077,8 @@ function ObjectFreeze(obj) {
       DefineOwnProperty(obj, name, desc, true);
     }
   }
-  return ObjectPreventExtension(obj);
+  %PreventExtensions(obj);
+  return obj;
 }
 
 
@@ -1062,6 +1087,9 @@ function ObjectPreventExtension(obj) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["preventExtension"]);
   }
+  if (%IsJSProxy(obj)) {
+    ProxyFix(obj);
+  }
   %PreventExtensions(obj);
   return obj;
 }
@@ -1072,6 +1100,9 @@ function ObjectIsSealed(obj) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["isSealed"]);
   }
+  if (%IsJSProxy(obj)) {
+    return false;
+  }
   var names = ObjectGetOwnPropertyNames(obj);
   for (var i = 0; i < names.length; i++) {
     var name = names[i];
@@ -1090,6 +1121,9 @@ function ObjectIsFrozen(obj) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["isFrozen"]);
   }
+  if (%IsJSProxy(obj)) {
+    return false;
+  }
   var names = ObjectGetOwnPropertyNames(obj);
   for (var i = 0; i < names.length; i++) {
     var name = names[i];
@@ -1109,6 +1143,9 @@ function ObjectIsExtensible(obj) {
   if (!IS_SPEC_OBJECT(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["isExtensible"]);
   }
+  if (%IsJSProxy(obj)) {
+    return true;
+  }
   return %IsExtensible(obj);
 }