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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libitm/] [local.cc] - Rev 741
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/* Copyright (C) 2008, 2009, 2011, 2012 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)
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