eh_globals.cc   [plain text]

// -*- C++ -*- Manage the thread-local exception globals.
// Copyright (C) 2001, 2004 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC 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 2, or (at your option)
// any later version.
//
// GCC 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 GCC; see the file COPYING.  If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.

// 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.


#include <exception>
#include <cstdlib>
#include "unwind-cxx.h"
#include "bits/c++config.h"
#include "bits/gthr.h"

using namespace __cxxabiv1;


// Single-threaded fallback buffer.
static __cxa_eh_globals globals_static;

#if __GTHREADS
/* APPLE LOCAL begin radar 3373515 */
static int use_thread_key = -1;

static void
get_globals_init_once ()
{
  use_thread_key = 1;
}
/* APPLE LOCAL end radar 3373515 */
#endif

extern "C" __cxa_eh_globals *
__cxxabiv1::__cxa_get_globals_fast () throw()
{
#if __GTHREADS
  if (use_thread_key)
    /* APPLE LOCAL begin radar 3373515 */
    return (__cxa_eh_globals *) _keymgr_get_per_thread_data (KEYMGR_EH_GLOBALS_KEY);
    /* APPLE LOCAL end radar 3373515 */
  else
    return &globals_static;
#else
  return &globals_static;
#endif
}

extern "C" __cxa_eh_globals *
__cxxabiv1::__cxa_get_globals () throw()
{
#if __GTHREADS
  __cxa_eh_globals *g;

  if (use_thread_key == 0)
    return &globals_static;

  if (use_thread_key < 0)
    {
      get_globals_init_once ();

      // Make sure use_thread_key got initialized.
      if (use_thread_key == 0)
	return &globals_static;
    }

  /* APPLE LOCAL begin radar 3373515 */
  g = (__cxa_eh_globals *) _keymgr_get_per_thread_data (KEYMGR_EH_GLOBALS_KEY);
  /* APPLE LOCAL end radar 3373515 */
  if (! g)
    {
      if ((g = (__cxa_eh_globals *)
	   std::malloc (sizeof (__cxa_eh_globals))) == 0
	  /* APPLE LOCAL begin radar 3373515 */
	  || KEYMGR_SET_PER_THREAD_DATA (KEYMGR_EH_GLOBALS_KEY, (void *) g) != 0)
	  /* APPLE LOCAL end radar 3373515 */
        std::terminate ();
      g->caughtExceptions = 0;
      g->uncaughtExceptions = 0;
    }

  return g;
#else
  return &globals_static;
#endif
}