Implement Object.keys for proxies.

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 831dd14ef84b233764946a02aef650ac86a8ea04..df918298d0216d59cb2a1c59cab26f06085bb7ac 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -308,6 +308,13 @@ function ObjectLookupSetter(name) {
 function ObjectKeys(obj) {
   if (!IS_SPEC_OBJECT(obj))
     throw MakeTypeError("obj_ctor_property_non_object", ["keys"]);
+  if (%IsJSProxy(obj)) {
+    var handler = %GetHandler(obj);
+    var keys = handler.keys;
+    if (IS_UNDEFINED(keys)) keys = DerivedKeysTrap;
+    var names = %_CallFunction(handler, keys);
+    return ToStringArray(names);
+  }
   return %LocalKeys(obj);
 }
 
@@ -585,7 +592,7 @@ function GetProperty(obj, p) {
       throw MakeTypeError("handler_trap_missing",
                           [handler, "getPropertyDescriptor"]);
     }
-    var descriptor = getProperty.call(handler, p);
+    var descriptor = %_CallFunction(handler, p, getProperty);
     if (IS_UNDEFINED(descriptor)) return descriptor;
     var desc = ToCompletePropertyDescriptor(descriptor);
     if (!desc.configurable) {
@@ -608,7 +615,7 @@ function HasProperty(obj, p) {
     var handler = %GetHandler(obj);
     var has = handler.has;
     if (IS_UNDEFINED(has)) has = DerivedHasTrap;
-    return ToBoolean(has.call(handler, obj, p));
+    return ToBoolean(%_CallFunction(handler, obj, p, has));
   }
   var desc = GetProperty(obj, p);
   return IS_UNDEFINED(desc) ? false : true;
@@ -636,7 +643,7 @@ function DefineProxyProperty(obj, p, attributes, should_throw) {
   if (IS_UNDEFINED(defineProperty)) {
     throw MakeTypeError("handler_trap_missing", [handler, "defineProperty"]);
   }
-  var result = defineProperty.call(handler, p, attributes);
+  var result = %_CallFunction(handler, p, attributes, defineProperty);
   if (!ToBoolean(result)) {
     if (should_throw) {
       throw MakeTypeError("handler_failed", [handler, "defineProperty"]);
@@ -868,7 +875,7 @@ function ObjectGetOwnPropertyNames(obj) {
       throw MakeTypeError("handler_trap_missing",
                           [handler, "getOwnPropertyNames"]);
     }
-    var names = getOwnPropertyNames.call(handler);
+    var names = %_CallFunction(handler, getOwnPropertyNames);
     return ToStringArray(names, "getOwnPropertyNames");
   }