1 /* Copyright (C) 2008-2018 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
3
4 This file is part of the GNU Transactional Memory Library (libitm).
5
6 Libitm is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25 #include "libitm_i.h"
26
27 using namespace GTM;
28
29 int ITM_REGPARM
_ITM_versionCompatible(int version)30 _ITM_versionCompatible (int version)
31 {
32 return version == _ITM_VERSION_NO;
33 }
34
35
36 const char * ITM_REGPARM
_ITM_libraryVersion(void)37 _ITM_libraryVersion (void)
38 {
39 return "GNU libitm " _ITM_VERSION;
40 }
41
42
43 _ITM_howExecuting ITM_REGPARM
_ITM_inTransaction(void)44 _ITM_inTransaction (void)
45 {
46 #if defined(USE_HTM_FASTPATH)
47 // If we use the HTM fastpath, we cannot reliably detect whether we are
48 // in a transaction because this function can be called outside of
49 // a transaction and thus we can't deduce this by looking at just the serial
50 // lock. This function isn't used in practice currently, so the easiest
51 // way to handle it is to just abort.
52 if (gtm_thread::serial_lock.get_htm_fastpath() && htm_transaction_active())
53 htm_abort();
54 #endif
55 struct gtm_thread *tx = gtm_thr();
56 if (tx && (tx->nesting > 0))
57 {
58 if (tx->state & gtm_thread::STATE_IRREVOCABLE)
59 return inIrrevocableTransaction;
60 else
61 return inRetryableTransaction;
62 }
63 return outsideTransaction;
64 }
65
66
67 _ITM_transactionId_t ITM_REGPARM
_ITM_getTransactionId(void)68 _ITM_getTransactionId (void)
69 {
70 #if defined(USE_HTM_FASTPATH)
71 // See ITM_inTransaction.
72 if (gtm_thread::serial_lock.get_htm_fastpath() && htm_transaction_active())
73 htm_abort();
74 #endif
75 struct gtm_thread *tx = gtm_thr();
76 return (tx && (tx->nesting > 0)) ? tx->id : _ITM_noTransactionId;
77 }
78
79
80 void ITM_REGPARM ITM_NORETURN
_ITM_error(const _ITM_srcLocation * loc UNUSED,int errorCode UNUSED)81 _ITM_error (const _ITM_srcLocation * loc UNUSED, int errorCode UNUSED)
82 {
83 abort ();
84 }
85