[d8 Workers] Throw when calling Worker constructor without new

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
@@ skipping 681 matching lines @@
 
 #ifndef V8_SHARED
 void Shell::WorkerNew(const v8::FunctionCallbackInfo<v8::Value>& args) {
   Isolate* isolate = args.GetIsolate();
   HandleScope handle_scope(isolate);
   if (args.Length() < 1 || !args[0]->IsString()) {
     Throw(args.GetIsolate(), "1st argument must be string");
     return;
   }
 
+  if (!args.IsConstructCall()) {
+    Throw(args.GetIsolate(), "Worker must be constructed with new");
+    return;
+  }
+
   {
     base::LockGuard<base::Mutex> lock_guard(workers_mutex_.Pointer());
     // Initialize the internal field to NULL; if we return early without
     // creating a new Worker (because the main thread is terminating) we can
     // early-out from the instance calls.
     args.Holder()->SetAlignedPointerInInternalField(0, NULL);
 
     if (!allow_new_workers_) return;
 
     Worker* worker = new Worker;
@@ skipping 1752 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif