/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WorkletPrincipal.h"

#include "jsapi.h"

#include "mozilla/Assertions.h"

namespace mozilla {

namespace dom {

namespace WorkletPrincipal {

struct WorkletPrincipal final : public JSPrincipals

{

  bool write(JSContext* aCx, JSStructuredCloneWriter* aWriter) override

  {

    MOZ_CRASH("WorkletPrincipal::write not implemented");

    return false;

  }

};

JSPrincipals*

GetWorkletPrincipal()

{

  static WorkletPrincipal sPrincipal;

  /*

   * To make sure the the principals refcount is initialized to one, atomically

   * increment it on every pass though this function. If we discover this wasn't

   * the first time, decrement it again. This avoids the need for

   * synchronization.

   */

  int32_t prevRefcount = sPrincipal.refcount++;

  if (prevRefcount > 0) {

    --sPrincipal.refcount;

  } else {

#ifdef DEBUG

    sPrincipal.debugToken = kJSPrincipalsDebugToken;

#endif

  }

  return &sPrincipal;

}

} // namespace WorkletPrincipal

} // namespace dom

} // namespace mozilla