1 files changed, 51 insertions, 0 deletions
diff --git a/libobjc/objc-foreach.c b/libobjc/objc-foreach.c
new file mode 100644
index 000000000..911206118
--- /dev/null
+++ b/libobjc/objc-foreach.c
@@ -0,0 +1,51 @@
+/* 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);
+}