102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/* Copyright (C) 2008-2022 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libitm_i.h"
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namespace GTM HIDDEN {
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// This function needs to be noinline because we need to prevent that it gets
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// inlined into another function that calls further functions. This could
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// break our assumption that we only call memcpy and thus only need to
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// additionally protect the memcpy stack (see the hack in mask_stack_bottom()).
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// Even if that isn't an issue because those other calls don't happen during
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// copying, we still need mask_stack_bottom() to be called "close" to the
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// memcpy in terms of stack frames, so just ensure that for now using the
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// noinline.
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void __attribute__((noinline))
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gtm_undolog::rollback (gtm_thread* tx, size_t until_size)
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{
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size_t i, n = undolog.size();
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void *top = mask_stack_top(tx);
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void *bot = mask_stack_bottom(tx);
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if (n > 0)
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{
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for (i = n; i-- > until_size; )
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{
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void *ptr = (void *) undolog[i--];
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size_t len = undolog[i];
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size_t words = (len + sizeof(gtm_word) - 1) / sizeof(gtm_word);
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i -= words;
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// Filter out any updates that overlap the libitm stack. We don't
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// bother filtering out just the overlapping bytes because we don't
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// merge writes and thus any overlapping write is either bogus or
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// would restore data on stack frames that are not in use anymore.
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// FIXME The memcpy can/will end up as another call but we
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// calculated BOT based on the current function. Can we inline or
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// reimplement this without too much trouble due to unaligned calls
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// and still have good performance, so that we can remove the hack
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// in mask_stack_bottom()?
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if (likely(ptr > top || (uint8_t*)ptr + len <= bot))
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__builtin_memcpy (ptr, &undolog[i], len);
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}
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undolog.set_size(until_size);
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}
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}
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void ITM_REGPARM
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GTM_LB (const void *ptr, size_t len)
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{
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gtm_thread *tx = gtm_thr();
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tx->undolog.log(ptr, len);
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}
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} // namespace GTM
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using namespace GTM;
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/* ??? Use configure to determine if aliases are supported. Or convince
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the compiler to not just tail call this, but actually generate the
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same_body_alias itself. */
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void ITM_REGPARM
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_ITM_LB (const void *ptr, size_t len)
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{
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GTM_LB (ptr, len);
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}
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#define ITM_LOG_DEF(T) \
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void ITM_REGPARM _ITM_L##T (const _ITM_TYPE_##T *ptr) \
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{ GTM_LB (ptr, sizeof (*ptr)); }
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ITM_LOG_DEF(U1)
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ITM_LOG_DEF(U2)
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ITM_LOG_DEF(U4)
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ITM_LOG_DEF(U8)
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ITM_LOG_DEF(F)
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ITM_LOG_DEF(D)
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ITM_LOG_DEF(E)
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ITM_LOG_DEF(CF)
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ITM_LOG_DEF(CD)
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ITM_LOG_DEF(CE)
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