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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=4 sw=2 et 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/. */

#ifndef mozilla_jsipc_JavaScriptChild_h_
#define mozilla_jsipc_JavaScriptChild_h_

#include "JavaScriptBase.h"
#include "mozilla/jsipc/PJavaScriptChild.h"

namespace mozilla {
namespace jsipc {

class JavaScriptChild : public JavaScriptBase<PJavaScriptChild> {
 public:
  JavaScriptChild() : strongReferenceObjIdMinimum_(0) {}
  virtual ~JavaScriptChild();

  bool init();
  void trace(JSTracer* trc);
  void updateWeakPointers();

  void drop(JSObject* obj);

  bool allowMessage(JSContext* cx) override { return true; }

 protected:
  virtual bool isParent() override { return false; }
  virtual JSObject* scopeForTargetObjects() override;

  mozilla::ipc::IPCResult RecvDropTemporaryStrongReferences(
      const uint64_t& upToObjId) override;

 private:
  bool fail(JSContext* cx, ReturnStatus* rs);
  bool ok(ReturnStatus* rs);

  // JavaScriptChild will keep strong references to JS objects that are
  // referenced by the parent only if their ID is >=
  // strongReferenceObjIdMinimum_.
  uint64_t strongReferenceObjIdMinimum_;
};

}  // namespace jsipc
}  // namespace mozilla

#endif