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8377e5e5 | 1 | /* Copyright (C) 2009, 2011, 2012 Free Software Foundation, Inc. |
0a35513e AH |
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 | /* Everything from libstdc++ is weak, to avoid requiring that library | |
30 | to be linked into plain C applications using libitm.so. */ | |
31 | ||
32 | #define WEAK __attribute__((weak)) | |
33 | ||
34 | extern "C" { | |
35 | ||
36 | extern void *__cxa_allocate_exception (size_t) WEAK; | |
37 | extern void __cxa_throw (void *, void *, void *) WEAK; | |
38 | extern void *__cxa_begin_catch (void *) WEAK; | |
f2f9a097 | 39 | extern void __cxa_end_catch (void) WEAK; |
0a35513e AH |
40 | extern void __cxa_tm_cleanup (void *, void *, unsigned int) WEAK; |
41 | ||
e948a1fb | 42 | #if !defined (HAVE_ELF_STYLE_WEAKREF) && !defined (__MACH__) |
d846e425 RO |
43 | void *__cxa_allocate_exception (size_t) { return NULL; } |
44 | void __cxa_throw (void *, void *, void *) { return; } | |
45 | void *__cxa_begin_catch (void *) { return NULL; } | |
f2f9a097 | 46 | void __cxa_end_catch (void) { return; } |
d846e425 | 47 | void __cxa_tm_cleanup (void *, void *, unsigned int) { return; } |
8377e5e5 | 48 | void _Unwind_DeleteException (_Unwind_Exception *) { return; } |
8cf36bb3 | 49 | #endif /* HAVE_ELF_STYLE_WEAKREF */ |
d846e425 | 50 | |
0a35513e AH |
51 | } |
52 | ||
53 | ||
54 | void * | |
55 | _ITM_cxa_allocate_exception (size_t size) | |
56 | { | |
57 | void *r = __cxa_allocate_exception (size); | |
58 | gtm_thr()->cxa_unthrown = r; | |
59 | return r; | |
60 | } | |
61 | ||
62 | void | |
63 | _ITM_cxa_throw (void *obj, void *tinfo, void *dest) | |
64 | { | |
65 | gtm_thr()->cxa_unthrown = NULL; | |
66 | __cxa_throw (obj, tinfo, dest); | |
67 | } | |
68 | ||
69 | void * | |
70 | _ITM_cxa_begin_catch (void *exc_ptr) | |
71 | { | |
72 | gtm_thr()->cxa_catch_count++; | |
73 | return __cxa_begin_catch (exc_ptr); | |
74 | } | |
75 | ||
76 | void | |
77 | _ITM_cxa_end_catch (void) | |
78 | { | |
79 | gtm_thr()->cxa_catch_count--; | |
80 | __cxa_end_catch (); | |
81 | } | |
82 | ||
83 | void | |
84 | GTM::gtm_thread::revert_cpp_exceptions (gtm_transaction_cp *cp) | |
85 | { | |
86 | if (cp) | |
87 | { | |
88 | // If rolling back a nested transaction, only clean up unthrown | |
89 | // exceptions since the last checkpoint. Always reset eh_in_flight | |
90 | // because it just contains the argument provided to | |
91 | // _ITM_commitTransactionEH | |
92 | void *unthrown = | |
93 | (cxa_unthrown != cp->cxa_unthrown ? cxa_unthrown : NULL); | |
94 | assert (cxa_catch_count >= cp->cxa_catch_count); | |
95 | uint32_t catch_count = cxa_catch_count - cp->cxa_catch_count; | |
96 | if (unthrown || catch_count) | |
97 | { | |
98 | __cxa_tm_cleanup (unthrown, this->eh_in_flight, catch_count); | |
99 | cxa_catch_count = cp->cxa_catch_count; | |
100 | cxa_unthrown = cp->cxa_unthrown; | |
101 | this->eh_in_flight = NULL; | |
102 | } | |
103 | } | |
104 | else | |
105 | { | |
106 | // Both cxa_catch_count and cxa_unthrown are maximal because EH regions | |
107 | // and transactions are properly nested. | |
108 | if (this->cxa_unthrown || this->cxa_catch_count) | |
109 | { | |
110 | __cxa_tm_cleanup (this->cxa_unthrown, this->eh_in_flight, | |
111 | this->cxa_catch_count); | |
112 | this->cxa_catch_count = 0; | |
113 | this->cxa_unthrown = NULL; | |
114 | this->eh_in_flight = NULL; | |
115 | } | |
116 | } | |
117 | } |