1 // -*- C++ -*- Exception handling routines for Transactional Memory.
2 // Copyright (C) 2009 Free Software Foundation, Inc.
4 // This file is part of GCC.
6 // GCC is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 3, or (at your option)
11 // GCC is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
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.
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/>.
26 #include "unwind-cxx.h"
28 using namespace __cxxabiv1
;
30 // Free one C++ exception.
33 free_any_cxa_exception (_Unwind_Exception
*eo
)
35 __cxa_refcounted_exception
*h
36 = __get_refcounted_exception_header_from_ue (eo
);
38 if (__is_dependent_exception (eo
->exception_class
))
40 __cxa_dependent_exception
*dep
41 = __get_dependent_exception_from_ue (eo
);
43 h
= __get_refcounted_exception_header_from_obj (dep
->primaryException
);
45 __cxa_free_dependent_exception (dep
);
48 if (__sync_sub_and_fetch (&h
->referenceCount
, 1) == 0)
49 __cxa_free_exception (h
+ 1);
52 // Cleanup exception handling state while rolling back state for
53 // a software transactional memory transaction.
55 // UNTHROWN_OBJ is non-null if we've called __cxa_allocate_exception
56 // but not yet called __cxa_throw for it.
58 // CLEANUP_EXC is non-null if we're currently processing a cleanup
59 // along an exception path, but we've not caught the exception yet.
61 // CAUGHT_COUNT is the nesting depth of __cxa_begin_catch within
62 // the transaction; undo as if calling __cxa_end_catch that many times.
65 __cxxabiv1::__cxa_tm_cleanup (void *unthrown_obj
,
67 unsigned int caught_count
) throw()
69 __cxa_eh_globals
*globals
= __cxa_get_globals_fast ();
71 // Handle a C++ exception not yet thrown.
74 globals
->uncaughtExceptions
-= 1;
75 __cxa_free_exception (unthrown_obj
);
78 // Handle an exception not yet caught ie. processing a cleanup
79 // in between the throw and the catch.
83 = reinterpret_cast <_Unwind_Exception
*>(cleanup_exc
);
84 if (__is_gxx_exception_class (eo
->exception_class
))
85 free_any_cxa_exception (eo
);
87 _Unwind_DeleteException (eo
);
90 // Do __cxa_end_catch caught_count times, but don't bother running
91 // the destructors for the objects involved. All of that is being
92 // undone by the transaction restart.
95 __cxa_exception
*h
= globals
->caughtExceptions
;
97 // Rethrown foreign exceptions are removed from the stack immediately.
98 // We would have freed this exception via THIS_EXC above.
104 __cxa_exception
*next
;
105 _Unwind_Exception
*eo
= &h
->unwindHeader
;
107 if (__is_gxx_exception_class (eo
->exception_class
))
109 next
= h
->nextException
;
110 free_any_cxa_exception (eo
);
114 _Unwind_DeleteException (eo
);
120 while (--caught_count
);
122 globals
->caughtExceptions
= h
;