1 files changed, 101 insertions, 0 deletions
diff --git a/gcc-4.8.3/libitm/local.cc b/gcc-4.8.3/libitm/local.cc
new file mode 100644
index 000000000..d462b71c6
--- /dev/null
+++ b/gcc-4.8.3/libitm/local.cc
@@ -0,0 +1,101 @@
+/* Copyright (C) 2008-2013 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Transactional Memory Library (libitm).
+
+   Libitm 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.
+
+   Libitm 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/>.  */
+
+#include "libitm_i.h"
+
+namespace GTM HIDDEN {
+
+// This function needs to be noinline because we need to prevent that it gets
+// inlined into another function that calls further functions. This could
+// break our assumption that we only call memcpy and thus only need to
+// additionally protect the memcpy stack (see the hack in mask_stack_bottom()).
+// Even if that isn't an issue because those other calls don't happen during
+// copying, we still need mask_stack_bottom() to be called "close" to the
+// memcpy in terms of stack frames, so just ensure that for now using the
+// noinline.
+void __attribute__((noinline))
+gtm_undolog::rollback (gtm_thread* tx, size_t until_size)
+{
+  size_t i, n = undolog.size();
+  void *top = mask_stack_top(tx);
+  void *bot = mask_stack_bottom(tx);
+
+  if (n > 0)
+    {
+      for (i = n; i-- > until_size; )
+	{
+          void *ptr = (void *) undolog[i--];
+          size_t len = undolog[i];
+          size_t words = (len + sizeof(gtm_word) - 1) / sizeof(gtm_word);
+          i -= words;
+          // Filter out any updates that overlap the libitm stack.  We don't
+          // bother filtering out just the overlapping bytes because we don't
+          // merge writes and thus any overlapping write is either bogus or
+          // would restore data on stack frames that are not in use anymore.
+          // FIXME The memcpy can/will end up as another call but we
+          // calculated BOT based on the current function.  Can we inline or
+          // reimplement this without too much trouble due to unaligned calls
+          // and still have good performance, so that we can remove the hack
+          // in mask_stack_bottom()?
+          if (likely(ptr > top || (uint8_t*)ptr + len <= bot))
+            __builtin_memcpy (ptr, &undolog[i], len);
+	}
+      undolog.set_size(until_size);
+    }
+}
+
+void ITM_REGPARM
+GTM_LB (const void *ptr, size_t len)
+{
+  gtm_thread *tx = gtm_thr();
+  tx->undolog.log(ptr, len);
+}
+
+} // namespace GTM
+
+using namespace GTM;
+
+/* ??? Use configure to determine if aliases are supported.  Or convince
+   the compiler to not just tail call this, but actually generate the
+   same_body_alias itself.  */
+void ITM_REGPARM
+_ITM_LB (const void *ptr, size_t len)
+{
+  GTM_LB (ptr, len);
+}
+
+#define ITM_LOG_DEF(T) \
+void ITM_REGPARM _ITM_L##T (const _ITM_TYPE_##T *ptr) \
+{ GTM_LB (ptr, sizeof (*ptr)); }
+
+ITM_LOG_DEF(U1)
+ITM_LOG_DEF(U2)
+ITM_LOG_DEF(U4)
+ITM_LOG_DEF(U8)
+ITM_LOG_DEF(F)
+ITM_LOG_DEF(D)
+ITM_LOG_DEF(E)
+ITM_LOG_DEF(CF)
+ITM_LOG_DEF(CD)
+ITM_LOG_DEF(CE)