Merge branch 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly
[dragonfly.git] / contrib / gcc-3.4 / libstdc++-v3 / libsupc++ / eh_throw.cc
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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, 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 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
46 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
47 // like the GCC _Unwind_DeleteException function does.
48 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
49 __terminate (header->terminateHandler);
50
51 if (header->exceptionDestructor)
52 header->exceptionDestructor (header + 1);
53
54 __cxa_free_exception (header + 1);
55}
56
57
58extern "C" void
59__cxa_throw (void *obj, std::type_info *tinfo, void (*dest) (void *))
60{
61 __cxa_exception *header = __get_exception_header_from_obj (obj);
62 header->exceptionType = tinfo;
63 header->exceptionDestructor = dest;
64 header->unexpectedHandler = __unexpected_handler;
65 header->terminateHandler = __terminate_handler;
66 header->unwindHeader.exception_class = __gxx_exception_class;
67 header->unwindHeader.exception_cleanup = __gxx_exception_cleanup;
68
69 __cxa_eh_globals *globals = __cxa_get_globals ();
70 globals->uncaughtExceptions += 1;
71
72#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
73 _Unwind_SjLj_RaiseException (&header->unwindHeader);
74#else
75 _Unwind_RaiseException (&header->unwindHeader);
76#endif
77
78 // Some sort of unwinding error. Note that terminate is a handler.
79 __cxa_begin_catch (&header->unwindHeader);
80 std::terminate ();
81}
82
83extern "C" void
84__cxa_rethrow ()
85{
86 __cxa_eh_globals *globals = __cxa_get_globals ();
87 __cxa_exception *header = globals->caughtExceptions;
88
89 // Watch for luser rethrowing with no active exception.
90 if (header)
91 {
92 // Tell __cxa_end_catch this is a rethrow.
93 if (header->unwindHeader.exception_class != __gxx_exception_class)
94 globals->caughtExceptions = 0;
95 else
96 header->handlerCount = -header->handlerCount;
97
98#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
99 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
100#else
101#ifdef _LIBUNWIND_STD_ABI
102 _Unwind_RaiseException (&header->unwindHeader);
103#else
104 _Unwind_Resume_or_Rethrow (&header->unwindHeader);
105#endif
106#endif
107
108 // Some sort of unwinding error. Note that terminate is a handler.
109 __cxa_begin_catch (&header->unwindHeader);
110 }
111 std::terminate ();
112}