1 |
17 |
jlechner |
// -*- 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, 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 |
|
|
// 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 |
|
|
|
45 |
|
|
namespace __cxxabiv1
|
46 |
|
|
{
|
47 |
|
|
|
48 |
|
|
// A C++ exception object consists of a header, which is a wrapper around
|
49 |
|
|
// an unwind object header with additional C++ specific information,
|
50 |
|
|
// followed by the exception object itself.
|
51 |
|
|
|
52 |
|
|
struct __cxa_exception
|
53 |
|
|
{
|
54 |
|
|
// Manage the exception object itself.
|
55 |
|
|
std::type_info *exceptionType;
|
56 |
|
|
void (*exceptionDestructor)(void *);
|
57 |
|
|
|
58 |
|
|
// The C++ standard has entertaining rules wrt calling set_terminate
|
59 |
|
|
// and set_unexpected in the middle of the exception cleanup process.
|
60 |
|
|
std::unexpected_handler unexpectedHandler;
|
61 |
|
|
std::terminate_handler terminateHandler;
|
62 |
|
|
|
63 |
|
|
// The caught exception stack threads through here.
|
64 |
|
|
__cxa_exception *nextException;
|
65 |
|
|
|
66 |
|
|
// How many nested handlers have caught this exception. A negated
|
67 |
|
|
// value is a signal that this object has been rethrown.
|
68 |
|
|
int handlerCount;
|
69 |
|
|
|
70 |
|
|
#ifdef __ARM_EABI_UNWINDER__
|
71 |
|
|
// Stack of exceptions in cleanups.
|
72 |
|
|
__cxa_exception* nextPropagatingException;
|
73 |
|
|
|
74 |
|
|
// The nuber of active cleanup handlers for this exception.
|
75 |
|
|
int propagationCount;
|
76 |
|
|
#else
|
77 |
|
|
// Cache parsed handler data from the personality routine Phase 1
|
78 |
|
|
// for Phase 2 and __cxa_call_unexpected.
|
79 |
|
|
int handlerSwitchValue;
|
80 |
|
|
const unsigned char *actionRecord;
|
81 |
|
|
const unsigned char *languageSpecificData;
|
82 |
|
|
_Unwind_Ptr catchTemp;
|
83 |
|
|
void *adjustedPtr;
|
84 |
|
|
#endif
|
85 |
|
|
|
86 |
|
|
// The generic exception header. Must be last.
|
87 |
|
|
_Unwind_Exception unwindHeader;
|
88 |
|
|
};
|
89 |
|
|
|
90 |
|
|
// Each thread in a C++ program has access to a __cxa_eh_globals object.
|
91 |
|
|
struct __cxa_eh_globals
|
92 |
|
|
{
|
93 |
|
|
__cxa_exception *caughtExceptions;
|
94 |
|
|
unsigned int uncaughtExceptions;
|
95 |
|
|
#ifdef __ARM_EABI_UNWINDER__
|
96 |
|
|
__cxa_exception* propagatingExceptions;
|
97 |
|
|
#endif
|
98 |
|
|
};
|
99 |
|
|
|
100 |
|
|
|
101 |
|
|
// The __cxa_eh_globals for the current thread can be obtained by using
|
102 |
|
|
// either of the following functions. The "fast" version assumes at least
|
103 |
|
|
// one prior call of __cxa_get_globals has been made from the current
|
104 |
|
|
// thread, so no initialization is necessary.
|
105 |
|
|
extern "C" __cxa_eh_globals *__cxa_get_globals () throw();
|
106 |
|
|
extern "C" __cxa_eh_globals *__cxa_get_globals_fast () throw();
|
107 |
|
|
|
108 |
|
|
// Allocate memory for the exception plus the thown object.
|
109 |
|
|
extern "C" void *__cxa_allocate_exception(std::size_t thrown_size) throw();
|
110 |
|
|
|
111 |
|
|
// Free the space allocated for the exception.
|
112 |
|
|
extern "C" void __cxa_free_exception(void *thrown_exception) throw();
|
113 |
|
|
|
114 |
|
|
// Throw the exception.
|
115 |
|
|
extern "C" void __cxa_throw (void *thrown_exception,
|
116 |
|
|
std::type_info *tinfo,
|
117 |
|
|
void (*dest) (void *))
|
118 |
|
|
__attribute__((noreturn));
|
119 |
|
|
|
120 |
|
|
// Used to implement exception handlers.
|
121 |
|
|
extern "C" void *__cxa_get_exception_ptr (void *) throw();
|
122 |
|
|
extern "C" void *__cxa_begin_catch (void *) throw();
|
123 |
|
|
extern "C" void __cxa_end_catch ();
|
124 |
|
|
extern "C" void __cxa_rethrow () __attribute__((noreturn));
|
125 |
|
|
|
126 |
|
|
// These facilitate code generation for recurring situations.
|
127 |
|
|
extern "C" void __cxa_bad_cast ();
|
128 |
|
|
extern "C" void __cxa_bad_typeid ();
|
129 |
|
|
|
130 |
|
|
// @@@ These are not directly specified by the IA-64 C++ ABI.
|
131 |
|
|
|
132 |
|
|
// Handles re-checking the exception specification if unexpectedHandler
|
133 |
|
|
// throws, and if bad_exception needs to be thrown. Called from the
|
134 |
|
|
// compiler.
|
135 |
|
|
extern "C" void __cxa_call_unexpected (void *) __attribute__((noreturn));
|
136 |
|
|
extern "C" void __cxa_call_terminate (void*) __attribute__((noreturn));
|
137 |
|
|
|
138 |
|
|
#ifdef __ARM_EABI_UNWINDER__
|
139 |
|
|
// Arm EABI specified routines.
|
140 |
|
|
typedef enum {
|
141 |
|
|
ctm_failed = 0,
|
142 |
|
|
ctm_succeeded = 1,
|
143 |
|
|
ctm_succeeded_with_ptr_to_base = 2
|
144 |
|
|
} __cxa_type_match_result;
|
145 |
|
|
extern "C" bool __cxa_type_match(_Unwind_Exception*, const std::type_info*,
|
146 |
|
|
bool, void**);
|
147 |
|
|
extern "C" void __cxa_begin_cleanup (_Unwind_Exception*);
|
148 |
|
|
extern "C" void __cxa_end_cleanup (void);
|
149 |
|
|
#endif
|
150 |
|
|
|
151 |
|
|
// Invokes given handler, dying appropriately if the user handler was
|
152 |
|
|
// so inconsiderate as to return.
|
153 |
|
|
extern void __terminate(std::terminate_handler) __attribute__((noreturn));
|
154 |
|
|
extern void __unexpected(std::unexpected_handler) __attribute__((noreturn));
|
155 |
|
|
|
156 |
|
|
// The current installed user handlers.
|
157 |
|
|
extern std::terminate_handler __terminate_handler;
|
158 |
|
|
extern std::unexpected_handler __unexpected_handler;
|
159 |
|
|
|
160 |
|
|
// These are explicitly GNU C++ specific.
|
161 |
|
|
|
162 |
|
|
// Acquire the C++ exception header from the C++ object.
|
163 |
|
|
static inline __cxa_exception *
|
164 |
|
|
__get_exception_header_from_obj (void *ptr)
|
165 |
|
|
{
|
166 |
|
|
return reinterpret_cast<__cxa_exception *>(ptr) - 1;
|
167 |
|
|
}
|
168 |
|
|
|
169 |
|
|
// Acquire the C++ exception header from the generic exception header.
|
170 |
|
|
static inline __cxa_exception *
|
171 |
|
|
__get_exception_header_from_ue (_Unwind_Exception *exc)
|
172 |
|
|
{
|
173 |
|
|
return reinterpret_cast<__cxa_exception *>(exc + 1) - 1;
|
174 |
|
|
}
|
175 |
|
|
|
176 |
|
|
#ifdef __ARM_EABI_UNWINDER__
|
177 |
|
|
static inline bool
|
178 |
|
|
__is_gxx_exception_class(_Unwind_Exception_Class c)
|
179 |
|
|
{
|
180 |
|
|
// TODO: Take advantage of the fact that c will always be word aligned.
|
181 |
|
|
return c[0] == 'G'
|
182 |
|
|
&& c[1] == 'N'
|
183 |
|
|
&& c[2] == 'U'
|
184 |
|
|
&& c[3] == 'C'
|
185 |
|
|
&& c[4] == 'C'
|
186 |
|
|
&& c[5] == '+'
|
187 |
|
|
&& c[6] == '+'
|
188 |
|
|
&& c[7] == '\0';
|
189 |
|
|
}
|
190 |
|
|
|
191 |
|
|
static inline void
|
192 |
|
|
__GXX_INIT_EXCEPTION_CLASS(_Unwind_Exception_Class c)
|
193 |
|
|
{
|
194 |
|
|
c[0] = 'G';
|
195 |
|
|
c[1] = 'N';
|
196 |
|
|
c[2] = 'U';
|
197 |
|
|
c[3] = 'C';
|
198 |
|
|
c[4] = 'C';
|
199 |
|
|
c[5] = '+';
|
200 |
|
|
c[6] = '+';
|
201 |
|
|
c[7] = '\0';
|
202 |
|
|
}
|
203 |
|
|
|
204 |
|
|
static inline void*
|
205 |
|
|
__gxx_caught_object(_Unwind_Exception* eo)
|
206 |
|
|
{
|
207 |
|
|
return (void*)eo->barrier_cache.bitpattern[0];
|
208 |
|
|
}
|
209 |
|
|
#else // !__ARM_EABI_UNWINDER__
|
210 |
|
|
// This is the exception class we report -- "GNUCC++\0".
|
211 |
|
|
const _Unwind_Exception_Class __gxx_exception_class
|
212 |
|
|
= ((((((((_Unwind_Exception_Class) 'G'
|
213 |
|
|
<< 8 | (_Unwind_Exception_Class) 'N')
|
214 |
|
|
<< 8 | (_Unwind_Exception_Class) 'U')
|
215 |
|
|
<< 8 | (_Unwind_Exception_Class) 'C')
|
216 |
|
|
<< 8 | (_Unwind_Exception_Class) 'C')
|
217 |
|
|
<< 8 | (_Unwind_Exception_Class) '+')
|
218 |
|
|
<< 8 | (_Unwind_Exception_Class) '+')
|
219 |
|
|
<< 8 | (_Unwind_Exception_Class) '\0');
|
220 |
|
|
|
221 |
|
|
static inline bool
|
222 |
|
|
__is_gxx_exception_class(_Unwind_Exception_Class c)
|
223 |
|
|
{
|
224 |
|
|
return c == __gxx_exception_class;
|
225 |
|
|
}
|
226 |
|
|
|
227 |
|
|
#define __GXX_INIT_EXCEPTION_CLASS(c) c = __gxx_exception_class
|
228 |
|
|
|
229 |
|
|
// GNU C++ personality routine, Version 0.
|
230 |
|
|
extern "C" _Unwind_Reason_Code __gxx_personality_v0
|
231 |
|
|
(int, _Unwind_Action, _Unwind_Exception_Class,
|
232 |
|
|
struct _Unwind_Exception *, struct _Unwind_Context *);
|
233 |
|
|
|
234 |
|
|
// GNU C++ sjlj personality routine, Version 0.
|
235 |
|
|
extern "C" _Unwind_Reason_Code __gxx_personality_sj0
|
236 |
|
|
(int, _Unwind_Action, _Unwind_Exception_Class,
|
237 |
|
|
struct _Unwind_Exception *, struct _Unwind_Context *);
|
238 |
|
|
|
239 |
|
|
static inline void*
|
240 |
|
|
__gxx_caught_object(_Unwind_Exception* eo)
|
241 |
|
|
{
|
242 |
|
|
__cxa_exception* header = __get_exception_header_from_ue (eo);
|
243 |
|
|
return header->adjustedPtr;
|
244 |
|
|
}
|
245 |
|
|
#endif // !__ARM_EABI_UNWINDER__
|
246 |
|
|
|
247 |
|
|
} /* namespace __cxxabiv1 */
|
248 |
|
|
|
249 |
|
|
#pragma GCC visibility pop
|
250 |
|
|
|
251 |
|
|
#endif // _UNWIND_CXX_H
|