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/* GNU Objective C Runtime 'fast enumeration' implementation

   Copyright (C) 2010 Free Software Foundation, Inc.

   Contributed by Nicola Pero <nicola.pero@meta-innovation.com>

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 3, 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

/* This file implements objc_enumeration_mutation() and

   objc_set_enumeration_mutation_handler(), the two functions required

   to handle mutations during a fast enumeration.  */

#include "objc-private/common.h"

#include "objc-private/error.h"     /* For _objc_abort() */

#include "objc/runtime.h"           /* For objc_enumerationMutation() and objc_set_enumeration_mutation_handler() */

/* The enumeration mutation handler currently in use.  */

static void (*__objc_enumeration_mutation_handler)(id) = NULL;

void

objc_setEnumerationMutationHandler (void (*handler)(id))

{

  __objc_enumeration_mutation_handler = handler;

}

void

objc_enumerationMutation (id collection)

{

  if (__objc_enumeration_mutation_handler != NULL)

    (*__objc_enumeration_mutation_handler) (collection);

  /* We always abort if we get here; there is no point in going on as

     the next iteration in the fast enumeration would probably go

     deeply wrong.  */

  _objc_abort ("Collection %p mutated during fast enumeration", collection);

}