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Diffstat (limited to 'gcc-4.8.3/libitm/local.cc')
-rw-r--r-- | gcc-4.8.3/libitm/local.cc | 101 |
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) |