Mercurial > hg > CbC > CbC_gcc
comparison gcc/unwind-sjlj.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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1 /* SJLJ exception handling and frame unwind runtime interface routines. | |
2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, | |
3 2009 Free Software Foundation, Inc. | |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by | |
9 the Free Software Foundation; either version 3, or (at your option) | |
10 any later version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 License for more details. | |
16 | |
17 Under Section 7 of GPL version 3, you are granted additional | |
18 permissions described in the GCC Runtime Library Exception, version | |
19 3.1, as published by the Free Software Foundation. | |
20 | |
21 You should have received a copy of the GNU General Public License and | |
22 a copy of the GCC Runtime Library Exception along with this program; | |
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 <http://www.gnu.org/licenses/>. */ | |
25 | |
26 #include "tconfig.h" | |
27 #include "tsystem.h" | |
28 #include "coretypes.h" | |
29 #include "tm.h" | |
30 #include "unwind.h" | |
31 #include "gthr.h" | |
32 | |
33 #ifdef __USING_SJLJ_EXCEPTIONS__ | |
34 | |
35 #ifdef DONT_USE_BUILTIN_SETJMP | |
36 #ifndef inhibit_libc | |
37 #include <setjmp.h> | |
38 #else | |
39 typedef void *jmp_buf[JMP_BUF_SIZE]; | |
40 extern void longjmp(jmp_buf, int) __attribute__((noreturn)); | |
41 #endif | |
42 #else | |
43 #define longjmp __builtin_longjmp | |
44 #endif | |
45 | |
46 /* The setjmp side is dealt with in the except.c file. */ | |
47 #undef setjmp | |
48 #define setjmp setjmp_should_not_be_used_in_this_file | |
49 | |
50 | |
51 /* This structure is allocated on the stack of the target function. | |
52 This must match the definition created in except.c:init_eh. */ | |
53 struct SjLj_Function_Context | |
54 { | |
55 /* This is the chain through all registered contexts. It is | |
56 filled in by _Unwind_SjLj_Register. */ | |
57 struct SjLj_Function_Context *prev; | |
58 | |
59 /* This is assigned in by the target function before every call | |
60 to the index of the call site in the lsda. It is assigned by | |
61 the personality routine to the landing pad index. */ | |
62 int call_site; | |
63 | |
64 /* This is how data is returned from the personality routine to | |
65 the target function's handler. */ | |
66 _Unwind_Word data[4]; | |
67 | |
68 /* These are filled in once by the target function before any | |
69 exceptions are expected to be handled. */ | |
70 _Unwind_Personality_Fn personality; | |
71 void *lsda; | |
72 | |
73 #ifdef DONT_USE_BUILTIN_SETJMP | |
74 /* We don't know what sort of alignment requirements the system | |
75 jmp_buf has. We over estimated in except.c, and now we have | |
76 to match that here just in case the system *didn't* have more | |
77 restrictive requirements. */ | |
78 jmp_buf jbuf __attribute__((aligned)); | |
79 #else | |
80 void *jbuf[]; | |
81 #endif | |
82 }; | |
83 | |
84 struct _Unwind_Context | |
85 { | |
86 struct SjLj_Function_Context *fc; | |
87 }; | |
88 | |
89 typedef struct | |
90 { | |
91 _Unwind_Personality_Fn personality; | |
92 } _Unwind_FrameState; | |
93 | |
94 | |
95 /* Manage the chain of registered function contexts. */ | |
96 | |
97 /* Single threaded fallback chain. */ | |
98 static struct SjLj_Function_Context *fc_static; | |
99 | |
100 #if __GTHREADS | |
101 static __gthread_key_t fc_key; | |
102 static int use_fc_key = -1; | |
103 | |
104 static void | |
105 fc_key_init (void) | |
106 { | |
107 use_fc_key = __gthread_key_create (&fc_key, 0) == 0; | |
108 } | |
109 | |
110 static void | |
111 fc_key_init_once (void) | |
112 { | |
113 static __gthread_once_t once = __GTHREAD_ONCE_INIT; | |
114 if (__gthread_once (&once, fc_key_init) != 0 || use_fc_key < 0) | |
115 use_fc_key = 0; | |
116 } | |
117 #endif | |
118 | |
119 void | |
120 _Unwind_SjLj_Register (struct SjLj_Function_Context *fc) | |
121 { | |
122 #if __GTHREADS | |
123 if (use_fc_key < 0) | |
124 fc_key_init_once (); | |
125 | |
126 if (use_fc_key) | |
127 { | |
128 fc->prev = __gthread_getspecific (fc_key); | |
129 __gthread_setspecific (fc_key, fc); | |
130 } | |
131 else | |
132 #endif | |
133 { | |
134 fc->prev = fc_static; | |
135 fc_static = fc; | |
136 } | |
137 } | |
138 | |
139 static inline struct SjLj_Function_Context * | |
140 _Unwind_SjLj_GetContext (void) | |
141 { | |
142 #if __GTHREADS | |
143 if (use_fc_key < 0) | |
144 fc_key_init_once (); | |
145 | |
146 if (use_fc_key) | |
147 return __gthread_getspecific (fc_key); | |
148 #endif | |
149 return fc_static; | |
150 } | |
151 | |
152 static inline void | |
153 _Unwind_SjLj_SetContext (struct SjLj_Function_Context *fc) | |
154 { | |
155 #if __GTHREADS | |
156 if (use_fc_key < 0) | |
157 fc_key_init_once (); | |
158 | |
159 if (use_fc_key) | |
160 __gthread_setspecific (fc_key, fc); | |
161 else | |
162 #endif | |
163 fc_static = fc; | |
164 } | |
165 | |
166 void | |
167 _Unwind_SjLj_Unregister (struct SjLj_Function_Context *fc) | |
168 { | |
169 _Unwind_SjLj_SetContext (fc->prev); | |
170 } | |
171 | |
172 | |
173 /* Get/set the return data value at INDEX in CONTEXT. */ | |
174 | |
175 _Unwind_Word | |
176 _Unwind_GetGR (struct _Unwind_Context *context, int index) | |
177 { | |
178 return context->fc->data[index]; | |
179 } | |
180 | |
181 /* Get the value of the CFA as saved in CONTEXT. */ | |
182 | |
183 _Unwind_Word | |
184 _Unwind_GetCFA (struct _Unwind_Context *context __attribute__((unused))) | |
185 { | |
186 /* ??? Ideally __builtin_setjmp places the CFA in the jmpbuf. */ | |
187 | |
188 #ifndef DONT_USE_BUILTIN_SETJMP | |
189 /* This is a crude imitation of the CFA: the saved stack pointer. | |
190 This is roughly the CFA of the frame before CONTEXT. When using the | |
191 DWARF-2 unwinder _Unwind_GetCFA returns the CFA of the frame described | |
192 by CONTEXT instead; but for DWARF-2 the cleanups associated with | |
193 CONTEXT have already been run, and for SJLJ they have not yet been. */ | |
194 if (context->fc != NULL) | |
195 return (_Unwind_Word) context->fc->jbuf[2]; | |
196 #endif | |
197 | |
198 /* Otherwise we're out of luck for now. */ | |
199 return (_Unwind_Word) 0; | |
200 } | |
201 | |
202 void | |
203 _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val) | |
204 { | |
205 context->fc->data[index] = val; | |
206 } | |
207 | |
208 /* Get the call-site index as saved in CONTEXT. */ | |
209 | |
210 _Unwind_Ptr | |
211 _Unwind_GetIP (struct _Unwind_Context *context) | |
212 { | |
213 return context->fc->call_site + 1; | |
214 } | |
215 | |
216 _Unwind_Ptr | |
217 _Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn) | |
218 { | |
219 *ip_before_insn = 0; | |
220 if (context->fc != NULL) | |
221 return context->fc->call_site + 1; | |
222 else | |
223 return 0; | |
224 } | |
225 | |
226 /* Set the return landing pad index in CONTEXT. */ | |
227 | |
228 void | |
229 _Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val) | |
230 { | |
231 context->fc->call_site = val - 1; | |
232 } | |
233 | |
234 void * | |
235 _Unwind_GetLanguageSpecificData (struct _Unwind_Context *context) | |
236 { | |
237 return context->fc->lsda; | |
238 } | |
239 | |
240 _Unwind_Ptr | |
241 _Unwind_GetRegionStart (struct _Unwind_Context *context __attribute__((unused)) ) | |
242 { | |
243 return 0; | |
244 } | |
245 | |
246 void * | |
247 _Unwind_FindEnclosingFunction (void *pc __attribute__((unused))) | |
248 { | |
249 return NULL; | |
250 } | |
251 | |
252 #ifndef __ia64__ | |
253 _Unwind_Ptr | |
254 _Unwind_GetDataRelBase (struct _Unwind_Context *context __attribute__((unused)) ) | |
255 { | |
256 return 0; | |
257 } | |
258 | |
259 _Unwind_Ptr | |
260 _Unwind_GetTextRelBase (struct _Unwind_Context *context __attribute__((unused)) ) | |
261 { | |
262 return 0; | |
263 } | |
264 #endif | |
265 | |
266 static inline _Unwind_Reason_Code | |
267 uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
268 { | |
269 if (context->fc == NULL) | |
270 { | |
271 fs->personality = NULL; | |
272 return _URC_END_OF_STACK; | |
273 } | |
274 else | |
275 { | |
276 fs->personality = context->fc->personality; | |
277 return _URC_NO_REASON; | |
278 } | |
279 } | |
280 | |
281 static inline void | |
282 uw_update_context (struct _Unwind_Context *context, | |
283 _Unwind_FrameState *fs __attribute__((unused)) ) | |
284 { | |
285 context->fc = context->fc->prev; | |
286 } | |
287 | |
288 static void | |
289 uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs) | |
290 { | |
291 _Unwind_SjLj_Unregister (context->fc); | |
292 uw_update_context (context, fs); | |
293 } | |
294 | |
295 static inline void | |
296 uw_init_context (struct _Unwind_Context *context) | |
297 { | |
298 context->fc = _Unwind_SjLj_GetContext (); | |
299 } | |
300 | |
301 static void __attribute__((noreturn)) | |
302 uw_install_context (struct _Unwind_Context *current __attribute__((unused)), | |
303 struct _Unwind_Context *target) | |
304 { | |
305 _Unwind_SjLj_SetContext (target->fc); | |
306 longjmp (target->fc->jbuf, 1); | |
307 } | |
308 | |
309 static inline _Unwind_Ptr | |
310 uw_identify_context (struct _Unwind_Context *context) | |
311 { | |
312 return (_Unwind_Ptr) context->fc; | |
313 } | |
314 | |
315 | |
316 /* Play games with unwind symbols so that we can have call frame | |
317 and sjlj symbols in the same shared library. Not that you can | |
318 use them simultaneously... */ | |
319 #define _Unwind_RaiseException _Unwind_SjLj_RaiseException | |
320 #define _Unwind_ForcedUnwind _Unwind_SjLj_ForcedUnwind | |
321 #define _Unwind_Resume _Unwind_SjLj_Resume | |
322 #define _Unwind_Resume_or_Rethrow _Unwind_SjLj_Resume_or_Rethrow | |
323 | |
324 #include "unwind.inc" | |
325 | |
326 #endif /* USING_SJLJ_EXCEPTIONS */ |