1// -*- C++ -*- Exception handling routines for throwing.
2// Copyright (C) 2001, 2003 Free Software Foundation, Inc.
3//
4// This file is part of GCC.
5//
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 2, or (at your option)
9// any later version.
10//
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.
15//
16// You should have received a copy of the GNU General Public License
17// along with GCC; see the file COPYING.  If not, write to
18// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19// Boston, MA 02110-1301, 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#include <bits/c++config.h>
31#include "unwind-cxx.h"
32
33using namespace __cxxabiv1;
34
35
36static void
37__gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
38{
39  __cxa_exception *header = __get_exception_header_from_ue (exc);
40
41  // If we haven't been caught by a foreign handler, then this is
42  // some sort of unwind error.  In that case just die immediately.
43  // _Unwind_DeleteException in the HP-UX IA64 libunwind library
44  //  returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
45  // like the GCC _Unwind_DeleteException function does.
46  if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
47    __terminate (header->terminateHandler);
48
49  if (header->exceptionDestructor)
50    header->exceptionDestructor (header + 1);
51
52  __cxa_free_exception (header + 1);
53}
54
55
56extern "C" void
57__cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
58			 void (*dest) (void *))
59{
60  __cxa_exception *header = __get_exception_header_from_obj (obj);
61  header->exceptionType = tinfo;
62  header->exceptionDestructor = dest;
63  header->unexpectedHandler = __unexpected_handler;
64  header->terminateHandler = __terminate_handler;
65  __GXX_INIT_EXCEPTION_CLASS(header->unwindHeader.exception_class);
66  header->unwindHeader.exception_cleanup = __gxx_exception_cleanup;
67
68#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
69  _Unwind_SjLj_RaiseException (&header->unwindHeader);
70#else
71  _Unwind_RaiseException (&header->unwindHeader);
72#endif
73
74  // Some sort of unwinding error.  Note that terminate is a handler.
75  __cxa_begin_catch (&header->unwindHeader);
76  std::terminate ();
77}
78
79extern "C" void
80__cxxabiv1::__cxa_rethrow ()
81{
82  __cxa_eh_globals *globals = __cxa_get_globals ();
83  __cxa_exception *header = globals->caughtExceptions;
84
85  globals->uncaughtExceptions += 1;
86
87  // Watch for luser rethrowing with no active exception.
88  if (header)
89    {
90      // Tell __cxa_end_catch this is a rethrow.
91      if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
92	globals->caughtExceptions = 0;
93      else
94	header->handlerCount = -header->handlerCount;
95
96#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
97      _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
98#else
99#if defined(_LIBUNWIND_STD_ABI)
100      _Unwind_RaiseException (&header->unwindHeader);
101#else
102      _Unwind_Resume_or_Rethrow (&header->unwindHeader);
103#endif
104#endif
105
106      // Some sort of unwinding error.  Note that terminate is a handler.
107      __cxa_begin_catch (&header->unwindHeader);
108    }
109  std::terminate ();
110}
111