Add API for access checks on observed objects

src/runtime.cc

 // Copyright 2012 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 13523 matching lines @@
   Handle<Object> key = args.at<Object>(1);
   if (key->IsJSGlobalProxy()) {
     key = handle(key->GetPrototype(), isolate);
     if (key->IsNull()) return *table;
   }
   Handle<Object> value = args.at<Object>(2);
   return *PutIntoObjectHashTable(table, key, value);
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_ObjectObserveAllowed) {
+  ASSERT(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSReceiver, receiver, 0);
+  // Proxies aren't currently allowed to have access checks enabled
+  if (receiver->IsJSProxy()) return isolate->heap()->true_value();
+  JSObject* object = JSObject::cast(receiver);
+  if (object->IsJSGlobalProxy()) {
+    Object* proto = object->GetPrototype();
+    if (proto->IsNull()) return isolate->heap()->false_value();
+    ASSERT(proto->IsJSGlobalObject());
+    object = JSObject::cast(proto);
+  }
+  if (!object->IsAccessCheckNeeded()) return isolate->heap()->true_value();
+  return isolate->heap()->ToBoolean(isolate->MayObserveAccess(object));
+}
+
+
 // ----------------------------------------------------------------------------
 // Implementation of Runtime
 
 #define F(name, number_of_args, result_size)                             \
   { Runtime::k##name, Runtime::RUNTIME, #name,   \
     FUNCTION_ADDR(Runtime_##name), number_of_args, result_size },
 
 
 #define I(name, number_of_args, result_size)                             \
   { Runtime::kInline##name, Runtime::INLINE,     \
@@ skipping 66 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal