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1 /* Copyright (C) 2008-2020 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU Transactional Memory Library (libitm).
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5
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6 Libitm is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "libitm_i.h"
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26
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27 using namespace GTM;
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28
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29 int ITM_REGPARM
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30 _ITM_versionCompatible (int version)
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31 {
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32 return version == _ITM_VERSION_NO;
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33 }
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34
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35
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36 const char * ITM_REGPARM
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37 _ITM_libraryVersion (void)
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38 {
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39 return "GNU libitm " _ITM_VERSION;
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40 }
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41
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42
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43 _ITM_howExecuting ITM_REGPARM
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44 _ITM_inTransaction (void)
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45 {
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46 #if defined(USE_HTM_FASTPATH)
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47 // If we use the HTM fastpath, we cannot reliably detect whether we are
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48 // in a transaction because this function can be called outside of
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49 // a transaction and thus we can't deduce this by looking at just the serial
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50 // lock. This function isn't used in practice currently, so the easiest
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51 // way to handle it is to just abort.
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52 if (gtm_thread::serial_lock.get_htm_fastpath() && htm_transaction_active())
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53 htm_abort();
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54 #endif
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55 struct gtm_thread *tx = gtm_thr();
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56 if (tx && (tx->nesting > 0))
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57 {
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58 if (tx->state & gtm_thread::STATE_IRREVOCABLE)
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59 return inIrrevocableTransaction;
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60 else
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61 return inRetryableTransaction;
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62 }
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63 return outsideTransaction;
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64 }
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65
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66
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67 _ITM_transactionId_t ITM_REGPARM
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68 _ITM_getTransactionId (void)
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69 {
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70 #if defined(USE_HTM_FASTPATH)
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71 // See ITM_inTransaction.
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72 if (gtm_thread::serial_lock.get_htm_fastpath() && htm_transaction_active())
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73 htm_abort();
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74 #endif
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75 struct gtm_thread *tx = gtm_thr();
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76 return (tx && (tx->nesting > 0)) ? tx->id : _ITM_noTransactionId;
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77 }
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78
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79
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80 void ITM_REGPARM ITM_NORETURN
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81 _ITM_error (const _ITM_srcLocation * loc UNUSED, int errorCode UNUSED)
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82 {
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83 abort ();
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84 }
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