eh_throw.cc revision 97403 
1// -*- C++ -*- Exception handling routines for throwing.
2// Copyright (C) 2001 Free Software Foundation, Inc.
3//
4// This file is part of GNU CC.
5//
6// GNU CC 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 2, or (at your option)
9// any later version.
10//
11// GNU CC 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.
15//
16// You should have received a copy of the GNU General Public License
17// along with GNU CC; see the file COPYING.  If not, write to
18// the Free Software Foundation, 59 Temple Place - Suite 330,
19// Boston, MA 02111-1307, USA.
20
21// As a special exception, you may use this file as part of a free software
22// library without restriction.  Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License.  This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30
31#include <bits/c++config.h>
32#include "unwind-cxx.h"
33
34
35using namespace __cxxabiv1;
36
37
38static void
39__gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
40{
41  __cxa_exception *header = __get_exception_header_from_ue (exc);
42
43  // If we haven't been caught by a foreign handler, then this is
44  // some sort of unwind error.  In that case just die immediately.
45  if (code != _URC_FOREIGN_EXCEPTION_CAUGHT)
46    __terminate (header->terminateHandler);
47
48  if (header->exceptionDestructor)
49    header->exceptionDestructor (header + 1);
50
51  __cxa_free_exception (header + 1);
52}
53
54
55extern "C" void
56__cxa_throw (void *obj, std::type_info *tinfo, void (*dest) (void *))
57{
58  __cxa_exception *header = __get_exception_header_from_obj (obj);
59  header->exceptionType = tinfo;
60  header->exceptionDestructor = dest;
61  header->unexpectedHandler = __unexpected_handler;
62  header->terminateHandler = __terminate_handler;
63  header->unwindHeader.exception_class = __gxx_exception_class;
64  header->unwindHeader.exception_cleanup = __gxx_exception_cleanup;
65
66  __cxa_eh_globals *globals = __cxa_get_globals ();
67  globals->uncaughtExceptions += 1;
68
69#ifdef _GLIBCPP_SJLJ_EXCEPTIONS
70  _Unwind_SjLj_RaiseException (&header->unwindHeader);
71#else
72  _Unwind_RaiseException (&header->unwindHeader);
73#endif
74
75  // Some sort of unwinding error.  Note that terminate is a handler.
76  __cxa_begin_catch (&header->unwindHeader);
77  std::terminate ();
78}
79
80extern "C" void
81__cxa_rethrow ()
82{
83  __cxa_eh_globals *globals = __cxa_get_globals ();
84  __cxa_exception *header = globals->caughtExceptions;
85
86  // Watch for luser rethrowing with no active exception.
87  if (header)
88    {
89      // Tell __cxa_end_catch this is a rethrow.
90      header->handlerCount = -header->handlerCount;
91
92#ifdef _GLIBCPP_SJLJ_EXCEPTIONS
93      _Unwind_SjLj_RaiseException (&header->unwindHeader);
94#else
95      _Unwind_RaiseException (&header->unwindHeader);
96#endif
97
98      // Some sort of unwinding error.  Note that terminate is a handler.
99      __cxa_begin_catch (&header->unwindHeader);
100    }
101  std::terminate ();
102}
103