Mercurial > octave-nkf
annotate src/unwind-prot.cc @ 7961:a5d1e27ee1f4 ss-3-1-51
3.1.51 snapshot
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 22 Jul 2008 11:40:48 -0400 |
| parents | 40c428ea3408 |
| children | eb63fbe60fab |
| rev | line source |
|---|---|
| 1 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2004, |
| 4 2005, 2006, 2007 John W. Eaton | |
| 1 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 1 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 1 | 21 |
| 22 */ | |
| 23 | |
| 240 | 24 #ifdef HAVE_CONFIG_H |
| 1192 | 25 #include <config.h> |
| 1 | 26 #endif |
| 27 | |
| 1343 | 28 #include <cstddef> |
| 7048 | 29 #include <cstring> |
| 1 | 30 |
| 453 | 31 #include "CMatrix.h" |
| 1 | 32 |
| 1352 | 33 #include "error.h" |
| 1 | 34 #include "unwind-prot.h" |
| 35 #include "utils.h" | |
| 36 | |
| 4214 | 37 std::stack<unwind_elem> unwind_protect::elt_list; |
| 1 | 38 |
| 2985 | 39 class |
| 40 saved_variable | |
| 1 | 41 { |
| 2985 | 42 public: |
| 1755 | 43 |
| 2985 | 44 enum var_type |
| 45 { | |
| 46 boolean, | |
| 47 integer, | |
|
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48 size_type, |
| 2985 | 49 string_type, |
| 50 generic_ptr, | |
| 51 generic | |
| 52 }; | |
| 1 | 53 |
| 54 saved_variable (void); | |
| 2985 | 55 |
| 56 saved_variable (bool *p, bool v); | |
| 57 | |
| 1 | 58 saved_variable (int *p, int v); |
| 2985 | 59 |
|
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60 saved_variable (size_t *p, size_t v); |
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61 |
| 3523 | 62 saved_variable (std::string *p, const std::string& v); |
| 2985 | 63 |
| 1 | 64 saved_variable (void **p, void *v); |
| 2985 | 65 |
| 1 | 66 ~saved_variable (void); |
| 67 | |
| 68 void restore_value (void); | |
| 69 | |
| 2985 | 70 static void restore (void *s); |
| 71 | |
| 72 private: | |
| 73 | |
| 1 | 74 union |
| 75 { | |
| 2985 | 76 bool *ptr_to_bool; |
| 1 | 77 int *ptr_to_int; |
|
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78 size_t *ptr_to_size_t; |
| 1 | 79 void *gen_ptr; |
| 80 void **ptr_to_gen_ptr; | |
| 81 }; | |
| 82 | |
| 83 union | |
| 84 { | |
| 2985 | 85 bool bool_value; |
| 1 | 86 int int_value; |
|
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87 size_t size_t_value; |
| 5760 | 88 std::string *str_value; |
| 1 | 89 void *gen_ptr_value; |
| 90 }; | |
| 91 | |
| 92 var_type type_tag; | |
| 2985 | 93 |
| 1 | 94 size_t size; |
| 95 }; | |
| 96 | |
| 97 saved_variable::saved_variable (void) | |
| 98 { | |
| 529 | 99 gen_ptr = 0; |
| 100 gen_ptr_value = 0; | |
| 1 | 101 type_tag = generic; |
| 102 size = 0; | |
| 103 } | |
| 104 | |
| 2985 | 105 saved_variable::saved_variable (bool *p, bool v) |
| 106 { | |
| 3018 | 107 type_tag = boolean; |
| 2985 | 108 ptr_to_bool = p; |
| 109 bool_value = v; | |
| 110 size = sizeof (bool); // Is this necessary? | |
| 111 } | |
| 112 | |
| 1 | 113 saved_variable::saved_variable (int *p, int v) |
| 114 { | |
| 115 type_tag = integer; | |
| 116 ptr_to_int = p; | |
| 117 int_value = v; | |
| 1755 | 118 size = sizeof (int); // Is this necessary? |
| 119 } | |
| 120 | |
|
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121 saved_variable::saved_variable (size_t *p, size_t v) |
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122 { |
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parents:
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123 type_tag = size_type; |
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parents:
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124 ptr_to_size_t = p; |
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parents:
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125 size_t_value = v; |
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parents:
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126 size = sizeof (size_t); // Is this necessary? |
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parents:
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127 } |
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parents:
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128 |
| 3523 | 129 saved_variable::saved_variable (std::string *p, const std::string& v) |
| 1755 | 130 { |
| 131 type_tag = string_type; | |
| 132 gen_ptr = p; | |
| 3523 | 133 str_value = new std::string (v); |
| 3549 | 134 size = sizeof (std::string); // Is this necessary? |
| 1 | 135 } |
| 136 | |
| 137 saved_variable::saved_variable (void **p, void *v) | |
| 138 { | |
| 139 type_tag = generic_ptr; | |
| 140 ptr_to_gen_ptr = p; | |
| 141 gen_ptr_value = v; | |
| 142 size = sizeof (void *); | |
| 143 } | |
| 144 | |
| 145 saved_variable::~saved_variable (void) | |
| 146 { | |
| 1755 | 147 switch (type_tag) |
| 148 { | |
| 149 case string_type: | |
| 150 delete str_value; | |
| 151 break; | |
| 152 | |
| 153 case generic: | |
| 5775 | 154 // FIXME |
| 3263 | 155 // delete [] gen_ptr_value; |
| 1755 | 156 break; |
| 157 | |
| 158 default: | |
| 159 break; | |
| 160 } | |
| 1 | 161 } |
| 162 | |
| 163 void | |
| 164 saved_variable::restore_value (void) | |
| 165 { | |
| 166 switch (type_tag) | |
| 167 { | |
| 2985 | 168 case boolean: |
| 169 *ptr_to_bool = bool_value; | |
| 170 break; | |
| 171 | |
| 1 | 172 case integer: |
| 173 *ptr_to_int = int_value; | |
| 174 break; | |
| 777 | 175 |
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40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7048
diff
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176 case size_type: |
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40c428ea3408
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parents:
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diff
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177 *ptr_to_size_t = size_t_value; |
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40c428ea3408
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parents:
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178 break; |
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40c428ea3408
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parents:
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179 |
| 1755 | 180 case string_type: |
| 3523 | 181 (static_cast<std::string *> (gen_ptr)) -> assign (*str_value); |
| 1755 | 182 break; |
| 183 | |
| 1 | 184 case generic_ptr: |
| 185 *ptr_to_gen_ptr = gen_ptr_value; | |
| 186 break; | |
| 777 | 187 |
| 1 | 188 case generic: |
| 189 memcpy (gen_ptr, gen_ptr_value, size); | |
| 190 break; | |
| 777 | 191 |
| 1 | 192 default: |
| 193 panic_impossible (); | |
| 777 | 194 break; |
| 1 | 195 } |
| 196 } | |
| 197 | |
| 2985 | 198 void |
| 199 saved_variable::restore (void *s) | |
| 1 | 200 { |
| 2800 | 201 saved_variable *sv = static_cast<saved_variable *> (s); |
| 1 | 202 sv->restore_value (); |
| 203 delete sv; | |
| 204 } | |
| 205 | |
| 206 void | |
| 2985 | 207 unwind_protect::add (unwind_elem::cleanup_func fptr, void *ptr) |
| 208 { | |
| 209 unwind_elem el (fptr, ptr); | |
| 4214 | 210 elt_list.push (el); |
| 2985 | 211 } |
| 212 | |
| 213 void | |
| 214 unwind_protect::run (void) | |
| 215 { | |
| 4214 | 216 unwind_elem el = elt_list.top (); |
| 217 | |
| 218 elt_list.pop (); | |
| 2985 | 219 |
| 220 unwind_elem::cleanup_func f = el.fptr (); | |
| 221 | |
| 222 if (f) | |
| 223 f (el.ptr ()); | |
| 224 } | |
| 225 | |
| 226 void | |
| 227 unwind_protect::discard (void) | |
| 1 | 228 { |
| 4214 | 229 elt_list.pop (); |
| 2985 | 230 } |
| 231 | |
| 232 void | |
| 3523 | 233 unwind_protect::begin_frame (const std::string& tag) |
| 2985 | 234 { |
| 235 unwind_elem elem (tag); | |
| 4214 | 236 elt_list.push (elem); |
| 2985 | 237 } |
| 238 | |
| 239 void | |
| 3523 | 240 unwind_protect::run_frame (const std::string& tag) |
| 2985 | 241 { |
| 4214 | 242 while (! elt_list.empty ()) |
| 2985 | 243 { |
| 4214 | 244 unwind_elem el = elt_list.top (); |
| 245 | |
| 246 elt_list.pop (); | |
| 2985 | 247 |
| 248 unwind_elem::cleanup_func f = el.fptr (); | |
| 249 | |
| 250 if (f) | |
| 251 f (el.ptr ()); | |
| 252 | |
| 253 if (tag == el.tag ()) | |
| 254 break; | |
| 255 } | |
| 1 | 256 } |
| 257 | |
| 258 void | |
| 3523 | 259 unwind_protect::discard_frame (const std::string& tag) |
| 1755 | 260 { |
| 4214 | 261 while (! elt_list.empty ()) |
| 2985 | 262 { |
| 4214 | 263 unwind_elem el = elt_list.top (); |
| 264 | |
| 265 elt_list.pop (); | |
| 2985 | 266 |
| 267 if (tag == el.tag ()) | |
| 268 break; | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 void | |
| 273 unwind_protect::run_all (void) | |
| 274 { | |
| 4214 | 275 while (! elt_list.empty ()) |
| 2985 | 276 { |
| 4214 | 277 unwind_elem el = elt_list.top (); |
| 278 | |
| 279 elt_list.pop (); | |
| 2985 | 280 |
| 281 unwind_elem::cleanup_func f = el.fptr (); | |
| 282 | |
| 283 if (f) | |
| 284 f (el.ptr ()); | |
| 285 } | |
| 1755 | 286 } |
| 287 | |
| 288 void | |
| 2985 | 289 unwind_protect::discard_all (void) |
| 290 { | |
| 4214 | 291 while (! elt_list.empty ()) |
| 292 elt_list.pop (); | |
| 2985 | 293 } |
| 294 | |
| 295 void | |
| 296 unwind_protect::save_bool (bool *ptr, bool value) | |
| 297 { | |
| 298 saved_variable *s = new saved_variable (ptr, value); | |
| 299 add (saved_variable::restore, s); | |
| 300 } | |
| 301 | |
| 302 void | |
| 303 unwind_protect::save_int (int *ptr, int value) | |
| 1 | 304 { |
| 305 saved_variable *s = new saved_variable (ptr, value); | |
| 2985 | 306 add (saved_variable::restore, s); |
| 307 } | |
| 308 | |
| 309 void | |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7048
diff
changeset
|
310 unwind_protect::save_size_t (size_t *ptr, size_t value) |
|
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7048
diff
changeset
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311 { |
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40c428ea3408
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parents:
7048
diff
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312 saved_variable *s = new saved_variable (ptr, value); |
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40c428ea3408
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parents:
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313 add (saved_variable::restore, s); |
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40c428ea3408
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parents:
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314 } |
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parents:
7048
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315 |
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parents:
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316 void |
| 3523 | 317 unwind_protect::save_str (std::string *ptr, const std::string& value) |
| 2985 | 318 { |
| 319 saved_variable *s = new saved_variable (ptr, value); | |
| 320 add (saved_variable::restore, s); | |
| 321 } | |
| 322 | |
| 323 void | |
| 324 unwind_protect::save_ptr (void **ptr, void *value) | |
| 325 { | |
| 326 saved_variable *s = new saved_variable (ptr, value); | |
| 327 add (saved_variable::restore, s); | |
| 1 | 328 } |
| 329 | |
| 330 /* | |
| 331 ;;; Local Variables: *** | |
| 332 ;;; mode: C++ *** | |
| 333 ;;; End: *** | |
| 334 */ |