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Source at commit 1247 created 8 years 2 months ago.
By meklort, Update makefiles... initial work for fat modules
1// -*- C++ -*- Exception handling and frame unwind runtime interface routines.
2// Copyright (C) 2001 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// This is derived from the C++ ABI for IA-64. Where we diverge
31// for cross-architecture compatibility are noted with "@@@".
32
33#ifndef _UNWIND_CXX_H
34#define _UNWIND_CXX_H 1
35
36// Level 2: C++ ABI
37
38#include <typeinfo>
39#include <exception>
40#include <cstddef>
41#include <unwind.h>
42
43#pragma GCC visibility push(default)
44
45namespace __cxxabiv1
46{
47
48#ifdef __UCLIBCXX_EXCEPTION_SUPPORT__
49
50// A C++ exception object consists of a header, which is a wrapper around
51// an unwind object header with additional C++ specific information,
52// followed by the exception object itself.
53
54struct __cxa_exception
55{
56 // Manage the exception object itself.
57 std::type_info *exceptionType;
58 void (*exceptionDestructor)(void *);
59
60 // The C++ standard has entertaining rules wrt calling set_terminate
61 // and set_unexpected in the middle of the exception cleanup process.
62 std::unexpected_handler unexpectedHandler;
63 std::terminate_handler terminateHandler;
64
65 // The caught exception stack threads through here.
66 __cxa_exception *nextException;
67
68 // How many nested handlers have caught this exception. A negated
69 // value is a signal that this object has been rethrown.
70 int handlerCount;
71
72 // Cache parsed handler data from the personality routine Phase 1
73 // for Phase 2 and __cxa_call_unexpected.
74 int handlerSwitchValue;
75 const unsigned char *actionRecord;
76 const unsigned char *languageSpecificData;
77 _Unwind_Ptr catchTemp;
78 void *adjustedPtr;
79
80 // The generic exception header. Must be last.
81 _Unwind_Exception unwindHeader;
82};
83
84// Each thread in a C++ program has access to a __cxa_eh_globals object.
85struct __cxa_eh_globals
86{
87 __cxa_exception *caughtExceptions;
88 unsigned int uncaughtExceptions;
89};
90
91
92// The __cxa_eh_globals for the current thread can be obtained by using
93// either of the following functions. The "fast" version assumes at least
94// one prior call of __cxa_get_globals has been made from the current
95// thread, so no initialization is necessary.
96extern "C" __cxa_eh_globals *__cxa_get_globals () throw();
97extern "C" __cxa_eh_globals *__cxa_get_globals_fast () throw();
98#endif
99
100#ifdef __UCLIBCXX_EXCEPTION_SUPPORT__
101// Allocate memory for the exception plus the thown object.
102extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw();
103
104// Free the space allocated for the exception.
105extern "C" void __cxa_free_exception(void *thrown_exception) throw();
106
107// Throw the exception.
108extern "C" void __cxa_throw (void *thrown_exception,
109 std::type_info *tinfo,
110 void (*dest) (void *))
111 __attribute__((noreturn));
112
113// Used to implement exception handlers.
114extern "C" void *__cxa_begin_catch (void *) throw();
115extern "C" void __cxa_end_catch ();
116extern "C" void __cxa_rethrow () __attribute__((noreturn));
117#endif
118
119// These facilitate code generation for recurring situations.
120extern "C" void __cxa_bad_cast ();
121extern "C" void __cxa_bad_typeid ();
122
123// @@@ These are not directly specified by the IA-64 C++ ABI.
124
125// Handles re-checking the exception specification if unexpectedHandler
126// throws, and if bad_exception needs to be thrown. Called from the
127// compiler.
128extern "C" void __cxa_call_unexpected (void *) __attribute__((noreturn));
129
130// Invokes given handler, dying appropriately if the user handler was
131// so inconsiderate as to return.
132extern void __terminate(std::terminate_handler) __attribute__((noreturn));
133extern void __unexpected(std::unexpected_handler) __attribute__((noreturn));
134
135// The current installed user handlers.
136extern std::terminate_handler __terminate_handler;
137extern std::unexpected_handler __unexpected_handler;
138
139#ifdef __UCLIBCXX_EXCEPTION_SUPPORT__
140// Acquire the C++ exception header from the C++ object.
141static inline __cxa_exception *
142__get_exception_header_from_obj (void *ptr)
143{
144 return reinterpret_cast<__cxa_exception *>(ptr) - 1;
145}
146
147// Acquire the C++ exception header from the generic exception header.
148static inline __cxa_exception *
149__get_exception_header_from_ue (_Unwind_Exception *exc)
150{
151 return reinterpret_cast<__cxa_exception *>(exc + 1) - 1;
152}
153#endif
154} /* namespace __cxxabiv1 */
155
156#pragma GCC visibility pop
157
158#endif // _UNWIND_CXX_H
159

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