ov-dld-fcn.cc

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/*

Copyright (C) 1996-2017 John W. Eaton

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include "oct-shlib.h"

#include <defaults.h>
#include "dynamic-ld.h"
#include "error.h"
#include "ovl.h"
#include "ov-dld-fcn.h"
#include "ov.h"


DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_dld_function,
                                     "dynamically-linked function",
                                     "dynamically-linked function");

octave_dld_function::octave_dld_function
  (octave_builtin::fcn ff, const octave::dynamic_library& shl,
   const std::string& nm, const std::string& ds)
  : octave_builtin (ff, nm, ds), sh_lib (shl)
{
  mark_fcn_file_up_to_date (time_parsed ());

  std::string file_name = fcn_file_name ();

  system_fcn_file
    = (! file_name.empty ()
       && Voct_file_dir == file_name.substr (0, Voct_file_dir.length ()));
}

octave_dld_function::~octave_dld_function (void)
{
  octave_dynamic_loader::remove_oct (my_name, sh_lib);
}

std::string
octave_dld_function::fcn_file_name (void) const
{
  return sh_lib.file_name ();
}

octave::sys::time
octave_dld_function::time_parsed (void) const
{
  return sh_lib.time_loaded ();
}

// Note: this wrapper around the octave_dld_function constructor is
//       necessary to work around a MSVC limitation handling in
//       virtual destructors that prevents unloading a dynamic module
//       before *all* objects (of class using a virtual dtor) have
//       been fully deleted; indeed, MSVC attaches auto-generated code
//       (scalar deleting destructor) to objects created in a dynamic
//       module, and this code will be executed in the dynamic module
//       context at object deletion; unloading the dynamic module
//       before objects have been deleted will make the "delete" code
//       of objects to point to an invalid code segment.

octave_dld_function*
octave_dld_function::create (octave_builtin::fcn ff,
                             const octave::dynamic_library& shl,
                             const std::string& nm, const std::string& ds)
{
  return new octave_dld_function (ff, shl, nm, ds);
}