error_helper

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// vi:set ft=cpp: -*- Mode: C++ -*-
/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>,
 *               Torsten Frenzel <frenzel@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
#pragma once
 
#include <l4/sys/types.h>
#include <l4/cxx/exceptions>
#include <l4/cxx/type_traits>
#include <l4/sys/err.h>
 
namespace L4Re {
 
#ifdef __EXCEPTIONS
 
[[noreturn]] inline void throw_error(long err, char const *extra = "")
{
  switch (err)
    {
    case -L4_ENOENT: throw (L4::Element_not_found(extra));
    case -L4_ENOMEM: throw (L4::Out_of_memory(extra));
    case -L4_EEXIST: throw (L4::Element_already_exists(extra));
    case -L4_ERANGE: throw (L4::Bounds_error(extra));
    default: throw (L4::Runtime_error(err, extra));
    }
}
 
inline
long chksys(long err, char const *extra = "", long ret = 0)
{
  if (L4_UNLIKELY(err < 0))
    throw_error(ret ? ret : err, extra);
 
  return err;
}
 
inline
long chksys(l4_msgtag_t const &t, char const *extra = "",
            l4_utcb_t *utcb = l4_utcb(), long ret = 0)
{
  if (L4_UNLIKELY(t.has_error()))
    throw_error(ret ? ret : l4_error_u(t, utcb), extra);
  else if (L4_UNLIKELY(t.label() < 0))
    throw_error(ret ? ret: t.label(), extra);
 
  return t.label();
}
 
inline
long chksys(l4_msgtag_t const &t, l4_utcb_t *utcb, char const *extra = "")
{ return chksys(t, extra, utcb); }
 
#if 0
inline
long chksys(long ret, long err, char const *extra = "")
{
  if (L4_UNLIKELY(ret < 0))
    throw_error(err, extra);
 
  return ret;
}
#endif
 
template<typename T>
inline
#if __cplusplus >= 201103L
T chkcap(T &&cap, char const *extra = "", long err = -L4_ENOMEM)
#else
T chkcap(T cap, char const *extra = "", long err = -L4_ENOMEM)
#endif
{
  if (L4_UNLIKELY(!cap.is_valid()))
    throw_error(err ? err : cap.cap(), extra);
 
#if __cplusplus >= 201103L
  return cxx::forward<T>(cap);
#else
  return cap;
#endif
}
 
inline
l4_msgtag_t
chkipc(l4_msgtag_t tag, char const *extra = "",
       l4_utcb_t *utcb = l4_utcb())
{
  if (L4_UNLIKELY(tag.has_error()))
    chksys(l4_error_u(tag, utcb), extra);
 
  return tag;
}
#endif
 
}