Mercurial > hg > xemacs-beta
annotate src/symbols.c @ 5117:3742ea8250b5 ben-lisp-object ben-lisp-object-final-ws-year-2005
Checking in final CVS version of workspace 'ben-lisp-object'
| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Sat, 26 Dec 2009 00:20:27 -0600 |
| parents | b7f26b2f78bd |
| children | e0db3c197671 |
| rev | line source |
|---|---|
| 428 | 1 /* "intern" and friends -- moved here from lread.c and data.c |
| 2 Copyright (C) 1985-1989, 1992-1994 Free Software Foundation, Inc. | |
| 793 | 3 Copyright (C) 1995, 2000, 2001, 2002 Ben Wing. |
| 428 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
| 7 XEmacs is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2, or (at your option) any | |
| 10 later version. | |
| 11 | |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with XEmacs; see the file COPYING. If not, write to | |
| 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 Boston, MA 02111-1307, USA. */ | |
| 21 | |
| 22 /* Synched up with: FSF 19.30. */ | |
| 23 | |
| 24 /* This file has been Mule-ized. */ | |
| 25 | |
| 26 /* NOTE: | |
| 27 | |
| 28 The value cell of a symbol can contain a simple value or one of | |
| 29 various symbol-value-magic objects. Some of these objects can | |
| 30 chain into other kinds of objects. Here is a table of possibilities: | |
| 31 | |
| 32 1a) simple value | |
| 33 1b) Qunbound | |
| 34 1c) symbol-value-forward, excluding Qunbound | |
| 35 2) symbol-value-buffer-local -> 1a or 1b or 1c | |
| 36 3) symbol-value-lisp-magic -> 1a or 1b or 1c | |
| 37 4) symbol-value-lisp-magic -> symbol-value-buffer-local -> 1a or 1b or 1c | |
| 38 5) symbol-value-varalias | |
| 39 6) symbol-value-lisp-magic -> symbol-value-varalias | |
| 40 | |
| 41 The "chain" of a symbol-value-buffer-local is its current_value slot. | |
| 42 | |
| 43 The "chain" of a symbol-value-lisp-magic is its shadowed slot, which | |
| 44 applies for handler types without associated handlers. | |
| 45 | |
| 46 All other fields in all the structures (including the "shadowed" slot | |
| 47 in a symbol-value-varalias) can *only* contain a simple value or Qunbound. | |
| 48 | |
| 49 */ | |
| 50 | |
| 51 /* #### Ugh, though, this file does awful things with symbol-value-magic | |
| 52 objects. This ought to be cleaned up. */ | |
| 53 | |
| 54 #include <config.h> | |
| 55 #include "lisp.h" | |
| 56 | |
| 57 #include "buffer.h" /* for Vbuffer_defaults */ | |
| 872 | 58 #include "console-impl.h" |
| 428 | 59 #include "elhash.h" |
| 60 | |
| 61 Lisp_Object Qad_advice_info, Qad_activate; | |
| 62 | |
| 63 Lisp_Object Qget_value, Qset_value, Qbound_predicate, Qmake_unbound; | |
| 64 Lisp_Object Qlocal_predicate, Qmake_local; | |
| 65 | |
| 66 Lisp_Object Qboundp, Qglobally_boundp, Qmakunbound; | |
| 67 Lisp_Object Qsymbol_value, Qset, Qdefault_boundp, Qdefault_value; | |
| 68 Lisp_Object Qset_default, Qsetq_default; | |
| 69 Lisp_Object Qmake_variable_buffer_local, Qmake_local_variable; | |
| 70 Lisp_Object Qkill_local_variable, Qkill_console_local_variable; | |
| 71 Lisp_Object Qsymbol_value_in_buffer, Qsymbol_value_in_console; | |
| 72 Lisp_Object Qlocal_variable_p; | |
| 73 | |
| 74 Lisp_Object Qconst_integer, Qconst_boolean, Qconst_object; | |
| 75 Lisp_Object Qconst_specifier; | |
| 76 Lisp_Object Qdefault_buffer, Qcurrent_buffer, Qconst_current_buffer; | |
| 77 Lisp_Object Qdefault_console, Qselected_console, Qconst_selected_console; | |
| 78 | |
| 79 static Lisp_Object maybe_call_magic_handler (Lisp_Object sym, | |
| 80 Lisp_Object funsym, | |
| 81 int nargs, ...); | |
| 82 static Lisp_Object fetch_value_maybe_past_magic (Lisp_Object sym, | |
| 83 Lisp_Object follow_past_lisp_magic); | |
| 84 static Lisp_Object *value_slot_past_magic (Lisp_Object sym); | |
| 85 static Lisp_Object follow_varalias_pointers (Lisp_Object symbol, | |
| 86 Lisp_Object follow_past_lisp_magic); | |
| 87 | |
| 88 | |
| 89 static Lisp_Object | |
| 90 mark_symbol (Lisp_Object obj) | |
| 91 { | |
| 440 | 92 Lisp_Symbol *sym = XSYMBOL (obj); |
| 428 | 93 |
| 94 mark_object (sym->value); | |
| 95 mark_object (sym->function); | |
| 793 | 96 mark_object (sym->name); |
| 428 | 97 if (!symbol_next (sym)) |
| 98 return sym->plist; | |
| 99 else | |
| 100 { | |
| 101 mark_object (sym->plist); | |
| 102 /* Mark the rest of the symbols in the obarray hash-chain */ | |
| 103 sym = symbol_next (sym); | |
| 793 | 104 return wrap_symbol (sym); |
| 428 | 105 } |
| 106 } | |
| 107 | |
| 1204 | 108 static const struct memory_description symbol_description[] = { |
| 440 | 109 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, next) }, |
| 110 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, name) }, | |
| 111 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, value) }, | |
| 112 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, function) }, | |
| 113 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, plist) }, | |
| 428 | 114 { XD_END } |
| 115 }; | |
| 116 | |
| 442 | 117 /* Symbol plists are directly accessible, so we need to protect against |
| 118 invalid property list structure */ | |
| 119 | |
| 120 static Lisp_Object | |
| 121 symbol_getprop (Lisp_Object symbol, Lisp_Object property) | |
| 122 { | |
| 123 return external_plist_get (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME); | |
| 124 } | |
| 125 | |
| 126 static int | |
| 127 symbol_putprop (Lisp_Object symbol, Lisp_Object property, Lisp_Object value) | |
| 128 { | |
| 129 external_plist_put (&XSYMBOL (symbol)->plist, property, value, 0, ERROR_ME); | |
| 130 return 1; | |
| 131 } | |
| 132 | |
| 133 static int | |
| 134 symbol_remprop (Lisp_Object symbol, Lisp_Object property) | |
| 135 { | |
| 136 return external_remprop (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME); | |
| 137 } | |
| 138 | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
139 DEFINE_BASIC_LISP_OBJECT_WITH_PROPS ("symbol", symbol, |
| 934 | 140 mark_symbol, print_symbol, |
| 141 0, 0, 0, symbol_description, | |
| 142 symbol_getprop, | |
| 143 symbol_putprop, | |
| 144 symbol_remprop, | |
| 145 Fsymbol_plist, | |
| 146 Lisp_Symbol); | |
| 428 | 147 |
| 148 /**********************************************************************/ | |
| 149 /* Intern */ | |
| 150 /**********************************************************************/ | |
| 151 | |
| 152 /* #### using a vector here is way bogus. Use a hash table instead. */ | |
| 153 | |
| 154 Lisp_Object Vobarray; | |
| 155 | |
| 156 static Lisp_Object initial_obarray; | |
| 157 | |
| 158 /* oblookup stores the bucket number here, for the sake of Funintern. */ | |
| 159 | |
| 160 static int oblookup_last_bucket_number; | |
| 161 | |
| 162 static Lisp_Object | |
| 163 check_obarray (Lisp_Object obarray) | |
| 164 { | |
| 165 while (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0) | |
| 166 { | |
| 167 /* If Vobarray is now invalid, force it to be valid. */ | |
| 168 if (EQ (Vobarray, obarray)) Vobarray = initial_obarray; | |
| 169 | |
| 170 obarray = wrong_type_argument (Qvectorp, obarray); | |
| 171 } | |
| 172 return obarray; | |
| 173 } | |
| 174 | |
| 175 Lisp_Object | |
| 867 | 176 intern_int (const Ibyte *str) |
| 428 | 177 { |
| 771 | 178 Bytecount len = qxestrlen (str); |
| 428 | 179 Lisp_Object obarray = Vobarray; |
| 180 | |
| 181 if (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0) | |
| 182 obarray = check_obarray (obarray); | |
| 183 | |
| 184 { | |
| 771 | 185 Lisp_Object tem = oblookup (obarray, str, len); |
| 428 | 186 if (SYMBOLP (tem)) |
| 187 return tem; | |
| 188 } | |
| 189 | |
| 771 | 190 return Fintern (make_string (str, len), obarray); |
| 191 } | |
| 192 | |
| 193 Lisp_Object | |
| 867 | 194 intern (const CIbyte *str) |
| 771 | 195 { |
| 867 | 196 return intern_int ((Ibyte *) str); |
| 428 | 197 } |
| 198 | |
| 814 | 199 Lisp_Object |
| 867 | 200 intern_converting_underscores_to_dashes (const CIbyte *str) |
| 814 | 201 { |
| 202 Bytecount len = strlen (str); | |
| 867 | 203 CIbyte *tmp = alloca_extbytes (len + 1); |
| 814 | 204 Bytecount i; |
| 205 strcpy (tmp, str); | |
| 206 for (i = 0; i < len; i++) | |
| 207 if (tmp[i] == '_') | |
| 208 tmp[i] = '-'; | |
| 867 | 209 return intern_int ((Ibyte *) tmp); |
| 814 | 210 } |
| 211 | |
| 428 | 212 DEFUN ("intern", Fintern, 1, 2, 0, /* |
| 213 Return the canonical symbol whose name is STRING. | |
| 214 If there is none, one is created by this function and returned. | |
| 444 | 215 Optional second argument OBARRAY specifies the obarray to use; |
| 216 it defaults to the value of the variable `obarray'. | |
| 428 | 217 */ |
| 218 (string, obarray)) | |
| 219 { | |
| 220 Lisp_Object object, *ptr; | |
| 793 | 221 Lisp_Object symbol; |
| 428 | 222 Bytecount len; |
| 223 | |
| 224 if (NILP (obarray)) obarray = Vobarray; | |
| 225 obarray = check_obarray (obarray); | |
| 226 | |
| 227 CHECK_STRING (string); | |
| 228 | |
| 229 len = XSTRING_LENGTH (string); | |
| 230 object = oblookup (obarray, XSTRING_DATA (string), len); | |
| 231 if (!INTP (object)) | |
| 232 /* Found it */ | |
| 233 return object; | |
| 234 | |
| 235 ptr = &XVECTOR_DATA (obarray)[XINT (object)]; | |
| 236 | |
| 237 object = Fmake_symbol (string); | |
| 793 | 238 symbol = object; |
| 428 | 239 |
| 240 if (SYMBOLP (*ptr)) | |
| 793 | 241 XSYMBOL_NEXT (symbol) = XSYMBOL (*ptr); |
| 428 | 242 else |
| 793 | 243 XSYMBOL_NEXT (symbol) = 0; |
| 428 | 244 *ptr = object; |
| 245 | |
| 826 | 246 if (string_byte (XSYMBOL_NAME (symbol), 0) == ':' && EQ (obarray, Vobarray)) |
| 428 | 247 { |
| 248 /* The LISP way is to put keywords in their own package, but we | |
| 249 don't have packages, so we do something simpler. Someday, | |
| 250 maybe we'll have packages and then this will be reworked. | |
| 251 --Stig. */ | |
| 793 | 252 XSYMBOL_VALUE (symbol) = object; |
| 428 | 253 } |
| 254 | |
| 255 return object; | |
| 256 } | |
| 257 | |
| 258 DEFUN ("intern-soft", Fintern_soft, 1, 2, 0, /* | |
| 259 Return the canonical symbol named NAME, or nil if none exists. | |
| 260 NAME may be a string or a symbol. If it is a symbol, that exact | |
| 261 symbol is searched for. | |
| 444 | 262 Optional second argument OBARRAY specifies the obarray to use; |
| 263 it defaults to the value of the variable `obarray'. | |
| 428 | 264 */ |
| 265 (name, obarray)) | |
| 266 { | |
| 267 /* #### Bug! (intern-soft "nil") returns nil. Perhaps we should | |
| 268 add a DEFAULT-IF-NOT-FOUND arg, like in get. */ | |
| 269 Lisp_Object tem; | |
| 793 | 270 Lisp_Object string; |
| 428 | 271 |
| 272 if (NILP (obarray)) obarray = Vobarray; | |
| 273 obarray = check_obarray (obarray); | |
| 274 | |
| 275 if (!SYMBOLP (name)) | |
| 276 { | |
| 277 CHECK_STRING (name); | |
| 793 | 278 string = name; |
| 428 | 279 } |
| 280 else | |
| 281 string = symbol_name (XSYMBOL (name)); | |
| 282 | |
| 793 | 283 tem = oblookup (obarray, XSTRING_DATA (string), XSTRING_LENGTH (string)); |
| 428 | 284 if (INTP (tem) || (SYMBOLP (name) && !EQ (name, tem))) |
| 285 return Qnil; | |
| 286 else | |
| 287 return tem; | |
| 288 } | |
| 289 | |
| 290 DEFUN ("unintern", Funintern, 1, 2, 0, /* | |
| 291 Delete the symbol named NAME, if any, from OBARRAY. | |
| 292 The value is t if a symbol was found and deleted, nil otherwise. | |
| 293 NAME may be a string or a symbol. If it is a symbol, that symbol | |
| 294 is deleted, if it belongs to OBARRAY--no other symbol is deleted. | |
| 444 | 295 OBARRAY defaults to the value of the variable `obarray'. |
| 428 | 296 */ |
| 297 (name, obarray)) | |
| 298 { | |
| 299 Lisp_Object tem; | |
| 793 | 300 Lisp_Object string; |
| 428 | 301 int hash; |
| 302 | |
| 303 if (NILP (obarray)) obarray = Vobarray; | |
| 304 obarray = check_obarray (obarray); | |
| 305 | |
| 306 if (SYMBOLP (name)) | |
| 307 string = symbol_name (XSYMBOL (name)); | |
| 308 else | |
| 309 { | |
| 310 CHECK_STRING (name); | |
| 793 | 311 string = name; |
| 428 | 312 } |
| 313 | |
| 793 | 314 tem = oblookup (obarray, XSTRING_DATA (string), XSTRING_LENGTH (string)); |
| 428 | 315 if (INTP (tem)) |
| 316 return Qnil; | |
| 317 /* If arg was a symbol, don't delete anything but that symbol itself. */ | |
| 318 if (SYMBOLP (name) && !EQ (name, tem)) | |
| 319 return Qnil; | |
| 320 | |
| 321 hash = oblookup_last_bucket_number; | |
| 322 | |
| 323 if (EQ (XVECTOR_DATA (obarray)[hash], tem)) | |
| 324 { | |
| 325 if (XSYMBOL (tem)->next) | |
| 793 | 326 XVECTOR_DATA (obarray)[hash] = wrap_symbol (XSYMBOL (tem)->next); |
| 428 | 327 else |
| 328 XVECTOR_DATA (obarray)[hash] = Qzero; | |
| 329 } | |
| 330 else | |
| 331 { | |
| 332 Lisp_Object tail, following; | |
| 333 | |
| 334 for (tail = XVECTOR_DATA (obarray)[hash]; | |
| 335 XSYMBOL (tail)->next; | |
| 336 tail = following) | |
| 337 { | |
| 793 | 338 following = wrap_symbol (XSYMBOL (tail)->next); |
| 428 | 339 if (EQ (following, tem)) |
| 340 { | |
| 341 XSYMBOL (tail)->next = XSYMBOL (following)->next; | |
| 342 break; | |
| 343 } | |
| 344 } | |
| 345 } | |
| 346 return Qt; | |
| 347 } | |
| 348 | |
| 349 /* Return the symbol in OBARRAY whose names matches the string | |
| 350 of SIZE characters at PTR. If there is no such symbol in OBARRAY, | |
| 351 return the index into OBARRAY that the string hashes to. | |
| 352 | |
| 353 Also store the bucket number in oblookup_last_bucket_number. */ | |
| 354 | |
| 355 Lisp_Object | |
| 867 | 356 oblookup (Lisp_Object obarray, const Ibyte *ptr, Bytecount size) |
| 428 | 357 { |
| 490 | 358 unsigned int hash, obsize; |
| 440 | 359 Lisp_Symbol *tail; |
| 428 | 360 Lisp_Object bucket; |
| 361 | |
| 362 if (!VECTORP (obarray) || | |
| 363 (obsize = XVECTOR_LENGTH (obarray)) == 0) | |
| 364 { | |
| 365 obarray = check_obarray (obarray); | |
| 366 obsize = XVECTOR_LENGTH (obarray); | |
| 367 } | |
| 368 hash = hash_string (ptr, size) % obsize; | |
| 369 oblookup_last_bucket_number = hash; | |
| 370 bucket = XVECTOR_DATA (obarray)[hash]; | |
| 371 if (ZEROP (bucket)) | |
| 372 ; | |
| 373 else if (!SYMBOLP (bucket)) | |
| 563 | 374 signal_error (Qinvalid_state, "Bad data in guts of obarray", Qunbound); /* Like CADR error message */ |
| 428 | 375 else |
| 376 for (tail = XSYMBOL (bucket); ;) | |
| 377 { | |
| 793 | 378 if (XSTRING_LENGTH (tail->name) == size && |
| 379 !memcmp (XSTRING_DATA (tail->name), ptr, size)) | |
| 428 | 380 { |
| 793 | 381 return wrap_symbol (tail); |
| 428 | 382 } |
| 383 tail = symbol_next (tail); | |
| 384 if (!tail) | |
| 385 break; | |
| 386 } | |
| 387 return make_int (hash); | |
| 388 } | |
| 389 | |
| 490 | 390 /* An excellent string hashing function. |
| 391 Adapted from glib's g_str_hash(). | |
| 392 Investigation by Karl Nelson <kenelson@ece.ucdavis.edu>. | |
| 393 Do a web search for "g_str_hash X31_HASH" if you want to know more. */ | |
| 394 unsigned int | |
| 867 | 395 hash_string (const Ibyte *ptr, Bytecount len) |
| 428 | 396 { |
| 490 | 397 unsigned int hash; |
| 398 | |
| 399 for (hash = 0; len; len--, ptr++) | |
| 400 /* (31 * hash) will probably be optimized to ((hash << 5) - hash). */ | |
| 401 hash = 31 * hash + *ptr; | |
| 402 | |
| 403 return hash; | |
| 428 | 404 } |
| 405 | |
| 406 /* Map FN over OBARRAY. The mapping is stopped when FN returns a | |
| 407 non-zero value. */ | |
| 408 void | |
| 409 map_obarray (Lisp_Object obarray, | |
| 410 int (*fn) (Lisp_Object, void *), void *arg) | |
| 411 { | |
| 412 REGISTER int i; | |
| 413 | |
| 414 CHECK_VECTOR (obarray); | |
| 415 for (i = XVECTOR_LENGTH (obarray) - 1; i >= 0; i--) | |
| 416 { | |
| 417 Lisp_Object tail = XVECTOR_DATA (obarray)[i]; | |
| 418 if (SYMBOLP (tail)) | |
| 419 while (1) | |
| 420 { | |
| 440 | 421 Lisp_Symbol *next; |
| 428 | 422 if ((*fn) (tail, arg)) |
| 423 return; | |
| 424 next = symbol_next (XSYMBOL (tail)); | |
| 425 if (!next) | |
| 426 break; | |
| 793 | 427 tail = wrap_symbol (next); |
| 428 | 428 } |
| 429 } | |
| 430 } | |
| 431 | |
| 432 static int | |
| 433 mapatoms_1 (Lisp_Object sym, void *arg) | |
| 434 { | |
| 435 call1 (*(Lisp_Object *)arg, sym); | |
| 436 return 0; | |
| 437 } | |
| 438 | |
| 439 DEFUN ("mapatoms", Fmapatoms, 1, 2, 0, /* | |
| 440 Call FUNCTION on every symbol in OBARRAY. | |
| 441 OBARRAY defaults to the value of `obarray'. | |
| 442 */ | |
| 443 (function, obarray)) | |
| 444 { | |
| 442 | 445 struct gcpro gcpro1; |
| 446 | |
| 428 | 447 if (NILP (obarray)) |
| 448 obarray = Vobarray; | |
| 449 obarray = check_obarray (obarray); | |
| 450 | |
| 442 | 451 GCPRO1 (obarray); |
| 428 | 452 map_obarray (obarray, mapatoms_1, &function); |
| 442 | 453 UNGCPRO; |
| 428 | 454 return Qnil; |
| 455 } | |
| 456 | |
| 457 | |
| 458 /**********************************************************************/ | |
| 459 /* Apropos */ | |
| 460 /**********************************************************************/ | |
| 461 | |
| 462 struct appropos_mapper_closure | |
| 463 { | |
| 464 Lisp_Object regexp; | |
| 465 Lisp_Object predicate; | |
| 466 Lisp_Object accumulation; | |
| 467 }; | |
| 468 | |
| 469 static int | |
| 470 apropos_mapper (Lisp_Object symbol, void *arg) | |
| 471 { | |
| 472 struct appropos_mapper_closure *closure = | |
| 473 (struct appropos_mapper_closure *) arg; | |
| 474 Bytecount match = fast_lisp_string_match (closure->regexp, | |
| 475 Fsymbol_name (symbol)); | |
| 476 | |
| 477 if (match >= 0 && | |
| 478 (NILP (closure->predicate) || | |
| 479 !NILP (call1 (closure->predicate, symbol)))) | |
| 480 closure->accumulation = Fcons (symbol, closure->accumulation); | |
| 481 | |
| 482 return 0; | |
| 483 } | |
| 484 | |
| 485 DEFUN ("apropos-internal", Fapropos_internal, 1, 2, 0, /* | |
| 444 | 486 Return a list of all symbols whose names contain match for REGEXP. |
| 487 If optional 2nd arg PREDICATE is non-nil, only symbols for which | |
| 488 \(funcall PREDICATE SYMBOL) returns non-nil are returned. | |
| 428 | 489 */ |
| 490 (regexp, predicate)) | |
| 491 { | |
| 492 struct appropos_mapper_closure closure; | |
| 442 | 493 struct gcpro gcpro1; |
| 428 | 494 |
| 495 CHECK_STRING (regexp); | |
| 496 | |
| 497 closure.regexp = regexp; | |
| 498 closure.predicate = predicate; | |
| 499 closure.accumulation = Qnil; | |
| 442 | 500 GCPRO1 (closure.accumulation); |
| 428 | 501 map_obarray (Vobarray, apropos_mapper, &closure); |
| 502 closure.accumulation = Fsort (closure.accumulation, Qstring_lessp); | |
| 442 | 503 UNGCPRO; |
| 428 | 504 return closure.accumulation; |
| 505 } | |
| 506 | |
| 507 | |
| 508 /* Extract and set components of symbols */ | |
| 509 | |
| 510 static void set_up_buffer_local_cache (Lisp_Object sym, | |
| 511 struct symbol_value_buffer_local *bfwd, | |
| 512 struct buffer *buf, | |
| 513 Lisp_Object new_alist_el, | |
| 514 int set_it_p); | |
| 515 | |
| 516 DEFUN ("boundp", Fboundp, 1, 1, 0, /* | |
| 517 Return t if SYMBOL's value is not void. | |
| 518 */ | |
| 519 (symbol)) | |
| 520 { | |
| 521 CHECK_SYMBOL (symbol); | |
| 522 return UNBOUNDP (find_symbol_value (symbol)) ? Qnil : Qt; | |
| 523 } | |
| 524 | |
| 525 DEFUN ("globally-boundp", Fglobally_boundp, 1, 1, 0, /* | |
| 526 Return t if SYMBOL has a global (non-bound) value. | |
| 527 This is for the byte-compiler; you really shouldn't be using this. | |
| 528 */ | |
| 529 (symbol)) | |
| 530 { | |
| 531 CHECK_SYMBOL (symbol); | |
| 532 return UNBOUNDP (top_level_value (symbol)) ? Qnil : Qt; | |
| 533 } | |
| 534 | |
| 535 DEFUN ("fboundp", Ffboundp, 1, 1, 0, /* | |
| 536 Return t if SYMBOL's function definition is not void. | |
| 537 */ | |
| 538 (symbol)) | |
| 539 { | |
| 540 CHECK_SYMBOL (symbol); | |
| 541 return UNBOUNDP (XSYMBOL (symbol)->function) ? Qnil : Qt; | |
| 542 } | |
| 543 | |
| 544 /* Return non-zero if SYM's value or function (the current contents of | |
| 545 which should be passed in as VAL) is constant, i.e. unsettable. */ | |
| 546 | |
| 547 static int | |
| 548 symbol_is_constant (Lisp_Object sym, Lisp_Object val) | |
| 549 { | |
| 550 /* #### - I wonder if it would be better to just have a new magic value | |
| 551 type and make nil, t, and all keywords have that same magic | |
| 552 constant_symbol value. This test is awfully specific about what is | |
| 553 constant and what isn't. --Stig */ | |
| 554 if (EQ (sym, Qnil) || | |
| 555 EQ (sym, Qt)) | |
| 556 return 1; | |
| 557 | |
| 558 if (SYMBOL_VALUE_MAGIC_P (val)) | |
| 559 switch (XSYMBOL_VALUE_MAGIC_TYPE (val)) | |
| 560 { | |
| 561 case SYMVAL_CONST_OBJECT_FORWARD: | |
| 562 case SYMVAL_CONST_SPECIFIER_FORWARD: | |
| 563 case SYMVAL_CONST_FIXNUM_FORWARD: | |
| 564 case SYMVAL_CONST_BOOLEAN_FORWARD: | |
| 565 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: | |
| 566 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: | |
| 567 return 1; | |
| 568 default: break; /* Warning suppression */ | |
| 569 } | |
| 570 | |
| 571 /* We don't return true for keywords here because they are handled | |
| 572 specially by reject_constant_symbols(). */ | |
| 573 return 0; | |
| 574 } | |
| 575 | |
| 576 /* We are setting SYM's value slot (or function slot, if FUNCTION_P is | |
| 577 non-zero) to NEWVAL. Make sure this is allowed. | |
| 578 FOLLOW_PAST_LISP_MAGIC specifies whether we delve past | |
| 579 symbol-value-lisp-magic objects. */ | |
| 580 | |
| 581 void | |
| 582 reject_constant_symbols (Lisp_Object sym, Lisp_Object newval, int function_p, | |
| 583 Lisp_Object follow_past_lisp_magic) | |
| 584 { | |
| 585 Lisp_Object val = | |
| 586 (function_p ? XSYMBOL (sym)->function | |
| 587 : fetch_value_maybe_past_magic (sym, follow_past_lisp_magic)); | |
| 588 | |
| 589 if (SYMBOL_VALUE_MAGIC_P (val) && | |
| 590 XSYMBOL_VALUE_MAGIC_TYPE (val) == SYMVAL_CONST_SPECIFIER_FORWARD) | |
| 563 | 591 invalid_change ("Use `set-specifier' to change a specifier's value", |
| 592 sym); | |
| 428 | 593 |
| 996 | 594 if ( |
| 595 #ifdef HAVE_SHLIB | |
| 596 !(unloading_module && UNBOUNDP(newval)) && | |
| 597 #endif | |
| 598 (symbol_is_constant (sym, val) | |
| 599 || (SYMBOL_IS_KEYWORD (sym) && !EQ (newval, sym)))) | |
| 563 | 600 signal_error_1 (Qsetting_constant, |
| 601 UNBOUNDP (newval) ? list1 (sym) : list2 (sym, newval)); | |
| 428 | 602 } |
| 603 | |
| 604 /* Verify that it's ok to make SYM buffer-local. This rejects | |
| 605 constants and default-buffer-local variables. FOLLOW_PAST_LISP_MAGIC | |
| 606 specifies whether we delve into symbol-value-lisp-magic objects. | |
| 607 (Should be a symbol indicating what action is being taken; that way, | |
| 608 we don't delve if there's a handler for that action, but do otherwise.) */ | |
| 609 | |
| 610 static void | |
| 611 verify_ok_for_buffer_local (Lisp_Object sym, | |
| 612 Lisp_Object follow_past_lisp_magic) | |
| 613 { | |
| 614 Lisp_Object val = fetch_value_maybe_past_magic (sym, follow_past_lisp_magic); | |
| 615 | |
| 616 if (symbol_is_constant (sym, val)) | |
| 617 goto not_ok; | |
| 618 if (SYMBOL_VALUE_MAGIC_P (val)) | |
| 619 switch (XSYMBOL_VALUE_MAGIC_TYPE (val)) | |
| 620 { | |
| 621 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 622 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 623 /* #### It's theoretically possible for it to be reasonable | |
| 624 to have both console-local and buffer-local variables, | |
| 625 but I don't want to consider that right now. */ | |
| 626 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 627 goto not_ok; | |
| 628 default: break; /* Warning suppression */ | |
| 629 } | |
| 630 | |
| 631 return; | |
| 632 | |
| 633 not_ok: | |
| 563 | 634 invalid_change ("Symbol may not be buffer-local", sym); |
| 428 | 635 } |
| 636 | |
| 637 DEFUN ("makunbound", Fmakunbound, 1, 1, 0, /* | |
| 638 Make SYMBOL's value be void. | |
| 639 */ | |
| 640 (symbol)) | |
| 641 { | |
| 642 Fset (symbol, Qunbound); | |
| 643 return symbol; | |
| 644 } | |
| 645 | |
| 646 DEFUN ("fmakunbound", Ffmakunbound, 1, 1, 0, /* | |
| 647 Make SYMBOL's function definition be void. | |
| 648 */ | |
| 649 (symbol)) | |
| 650 { | |
| 651 CHECK_SYMBOL (symbol); | |
| 652 reject_constant_symbols (symbol, Qunbound, 1, Qt); | |
| 653 XSYMBOL (symbol)->function = Qunbound; | |
| 654 return symbol; | |
| 655 } | |
| 656 | |
| 657 DEFUN ("symbol-function", Fsymbol_function, 1, 1, 0, /* | |
| 658 Return SYMBOL's function definition. Error if that is void. | |
| 659 */ | |
| 660 (symbol)) | |
| 661 { | |
| 662 CHECK_SYMBOL (symbol); | |
| 663 if (UNBOUNDP (XSYMBOL (symbol)->function)) | |
| 664 signal_void_function_error (symbol); | |
| 665 return XSYMBOL (symbol)->function; | |
| 666 } | |
| 667 | |
| 668 DEFUN ("symbol-plist", Fsymbol_plist, 1, 1, 0, /* | |
| 669 Return SYMBOL's property list. | |
| 670 */ | |
| 671 (symbol)) | |
| 672 { | |
| 673 CHECK_SYMBOL (symbol); | |
| 674 return XSYMBOL (symbol)->plist; | |
| 675 } | |
| 676 | |
| 677 DEFUN ("symbol-name", Fsymbol_name, 1, 1, 0, /* | |
| 678 Return SYMBOL's name, a string. | |
| 679 */ | |
| 680 (symbol)) | |
| 681 { | |
| 682 CHECK_SYMBOL (symbol); | |
| 793 | 683 return XSYMBOL (symbol)->name; |
| 428 | 684 } |
| 685 | |
| 686 DEFUN ("fset", Ffset, 2, 2, 0, /* | |
| 687 Set SYMBOL's function definition to NEWDEF, and return NEWDEF. | |
| 688 */ | |
| 689 (symbol, newdef)) | |
| 690 { | |
| 691 /* This function can GC */ | |
| 692 CHECK_SYMBOL (symbol); | |
| 693 reject_constant_symbols (symbol, newdef, 1, Qt); | |
| 694 if (!NILP (Vautoload_queue) && !UNBOUNDP (XSYMBOL (symbol)->function)) | |
| 695 Vautoload_queue = Fcons (Fcons (symbol, XSYMBOL (symbol)->function), | |
| 696 Vautoload_queue); | |
| 697 XSYMBOL (symbol)->function = newdef; | |
| 698 /* Handle automatic advice activation */ | |
| 699 if (CONSP (XSYMBOL (symbol)->plist) && | |
| 700 !NILP (Fget (symbol, Qad_advice_info, Qnil))) | |
| 701 { | |
| 702 call2 (Qad_activate, symbol, Qnil); | |
| 703 newdef = XSYMBOL (symbol)->function; | |
| 704 } | |
| 705 return newdef; | |
| 706 } | |
| 707 | |
| 708 /* FSFmacs */ | |
| 709 DEFUN ("define-function", Fdefine_function, 2, 2, 0, /* | |
| 710 Set SYMBOL's function definition to NEWDEF, and return NEWDEF. | |
| 711 Associates the function with the current load file, if any. | |
| 712 */ | |
| 713 (symbol, newdef)) | |
| 714 { | |
| 715 /* This function can GC */ | |
| 716 Ffset (symbol, newdef); | |
| 717 LOADHIST_ATTACH (symbol); | |
| 718 return newdef; | |
| 719 } | |
| 720 | |
| 721 | |
| 722 DEFUN ("setplist", Fsetplist, 2, 2, 0, /* | |
| 723 Set SYMBOL's property list to NEWPLIST, and return NEWPLIST. | |
| 724 */ | |
| 725 (symbol, newplist)) | |
| 726 { | |
| 727 CHECK_SYMBOL (symbol); | |
| 728 | |
| 729 XSYMBOL (symbol)->plist = newplist; | |
| 730 return newplist; | |
| 731 } | |
| 732 | |
| 733 | |
| 734 /**********************************************************************/ | |
| 735 /* symbol-value */ | |
| 736 /**********************************************************************/ | |
| 737 | |
| 738 /* If the contents of the value cell of a symbol is one of the following | |
| 739 three types of objects, then the symbol is "magic" in that setting | |
| 740 and retrieving its value doesn't just set or retrieve the raw | |
| 741 contents of the value cell. None of these objects can escape to | |
| 742 the user level, so there is no loss of generality. | |
| 743 | |
| 744 If a symbol is "unbound", then the contents of its value cell is | |
| 745 Qunbound. Despite appearances, this is *not* a symbol, but is a | |
| 746 symbol-value-forward object. This is so that printing it results | |
| 747 in "INTERNAL OBJECT (XEmacs bug?)", in case it leaks to Lisp, somehow. | |
| 748 | |
| 749 Logically all of the following objects are "symbol-value-magic" | |
| 750 objects, and there are some games played w.r.t. this (#### this | |
| 751 should be cleaned up). SYMBOL_VALUE_MAGIC_P is true for all of | |
| 752 the object types. XSYMBOL_VALUE_MAGIC_TYPE returns the type of | |
| 753 symbol-value-magic object. There are more than three types | |
| 754 returned by this macro: in particular, symbol-value-forward | |
| 755 has eight subtypes, and symbol-value-buffer-local has two. See | |
| 756 symeval.h. | |
| 757 | |
| 758 1. symbol-value-forward | |
| 759 | |
| 760 symbol-value-forward is used for variables whose actual contents | |
| 761 are stored in a C variable of some sort, and for Qunbound. The | |
| 762 lcheader.next field (which is only used to chain together free | |
| 763 lcrecords) holds a pointer to the actual C variable. Included | |
| 764 in this type are "buffer-local" variables that are actually | |
| 765 stored in the buffer object itself; in this case, the "pointer" | |
| 766 is an offset into the struct buffer structure. | |
| 767 | |
| 768 The subtypes are as follows: | |
| 769 | |
| 770 SYMVAL_OBJECT_FORWARD: | |
| 771 (declare with DEFVAR_LISP) | |
| 772 The value of this variable is stored in a C variable of type | |
| 773 "Lisp_Object". Setting this variable sets the C variable. | |
| 774 Accessing this variable retrieves a value from the C variable. | |
| 775 These variables can be buffer-local -- in this case, the | |
| 776 raw symbol-value field gets converted into a | |
| 777 symbol-value-buffer-local, whose "current_value" slot contains | |
| 778 the symbol-value-forward. (See below.) | |
| 779 | |
| 780 SYMVAL_FIXNUM_FORWARD: | |
| 458 | 781 (declare with DEFVAR_INT) |
| 782 Similar to SYMVAL_OBJECT_FORWARD except that the C variable | |
| 783 is of type "Fixnum", a typedef for "EMACS_INT", and the corresponding | |
| 784 lisp variable is always the corresponding integer. | |
| 785 | |
| 428 | 786 SYMVAL_BOOLEAN_FORWARD: |
| 458 | 787 (declare with DEFVAR_BOOL) |
| 428 | 788 Similar to SYMVAL_OBJECT_FORWARD except that the C variable |
| 458 | 789 is of type "int" and is a boolean. |
| 428 | 790 |
| 791 SYMVAL_CONST_OBJECT_FORWARD: | |
| 792 SYMVAL_CONST_FIXNUM_FORWARD: | |
| 793 SYMVAL_CONST_BOOLEAN_FORWARD: | |
| 794 (declare with DEFVAR_CONST_LISP, DEFVAR_CONST_INT, or | |
| 795 DEFVAR_CONST_BOOL) | |
| 796 Similar to SYMVAL_OBJECT_FORWARD, SYMVAL_FIXNUM_FORWARD, or | |
| 797 SYMVAL_BOOLEAN_FORWARD, respectively, except that the value cannot | |
| 798 be changed. | |
| 799 | |
| 800 SYMVAL_CONST_SPECIFIER_FORWARD: | |
| 801 (declare with DEFVAR_SPECIFIER) | |
| 440 | 802 Exactly like SYMVAL_CONST_OBJECT_FORWARD except that the error |
| 803 message you get when attempting to set the value says to use | |
| 428 | 804 `set-specifier' instead. |
| 805 | |
| 806 SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 807 (declare with DEFVAR_BUFFER_LOCAL) | |
| 808 This is used for built-in buffer-local variables -- i.e. | |
| 809 Lisp variables whose value is stored in the "struct buffer". | |
| 810 Variables of this sort always forward into C "Lisp_Object" | |
| 811 fields (although there's no reason in principle that other | |
| 812 types for ints and booleans couldn't be added). Note that | |
| 813 some of these variables are automatically local in each | |
| 814 buffer, while some are only local when they become set | |
| 815 (similar to `make-variable-buffer-local'). In these latter | |
| 816 cases, of course, the default value shows through in all | |
| 817 buffers in which the variable doesn't have a local value. | |
| 818 This is implemented by making sure the "struct buffer" field | |
| 819 always contains the correct value (whether it's local or | |
| 820 a default) and maintaining a mask in the "struct buffer" | |
| 821 indicating which fields are local. When `set-default' is | |
| 822 called on a variable that's not always local to all buffers, | |
| 823 it loops through each buffer and sets the corresponding | |
| 824 field in each buffer without a local value for the field, | |
| 825 according to the mask. | |
| 826 | |
| 827 Calling `make-local-variable' on a variable of this sort | |
| 828 only has the effect of maybe changing the current buffer's mask. | |
| 829 Calling `make-variable-buffer-local' on a variable of this | |
| 830 sort has no effect at all. | |
| 831 | |
| 832 SYMVAL_CONST_CURRENT_BUFFER_FORWARD: | |
| 833 (declare with DEFVAR_CONST_BUFFER_LOCAL) | |
| 834 Same as SYMVAL_CURRENT_BUFFER_FORWARD except that the | |
| 835 value cannot be set. | |
| 836 | |
| 837 SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 838 (declare with DEFVAR_BUFFER_DEFAULTS) | |
| 839 This is used for the Lisp variables that contain the | |
| 840 default values of built-in buffer-local variables. Setting | |
| 841 or referencing one of these variables forwards into a slot | |
| 842 in the special struct buffer Vbuffer_defaults. | |
| 843 | |
| 844 SYMVAL_UNBOUND_MARKER: | |
| 845 This is used for only one object, Qunbound. | |
| 846 | |
| 847 SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 848 (declare with DEFVAR_CONSOLE_LOCAL) | |
| 849 This is used for built-in console-local variables -- i.e. | |
| 850 Lisp variables whose value is stored in the "struct console". | |
| 851 These work just like built-in buffer-local variables. | |
| 852 However, calling `make-local-variable' or | |
| 853 `make-variable-buffer-local' on one of these variables | |
| 854 is currently disallowed because that would entail having | |
| 855 both console-local and buffer-local variables, which is | |
| 856 trickier to implement. | |
| 857 | |
| 858 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: | |
| 859 (declare with DEFVAR_CONST_CONSOLE_LOCAL) | |
| 860 Same as SYMVAL_SELECTED_CONSOLE_FORWARD except that the | |
| 861 value cannot be set. | |
| 862 | |
| 863 SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 864 (declare with DEFVAR_CONSOLE_DEFAULTS) | |
| 865 This is used for the Lisp variables that contain the | |
| 866 default values of built-in console-local variables. Setting | |
| 867 or referencing one of these variables forwards into a slot | |
| 868 in the special struct console Vconsole_defaults. | |
| 869 | |
| 870 | |
| 871 2. symbol-value-buffer-local | |
| 872 | |
| 873 symbol-value-buffer-local is used for variables that have had | |
| 874 `make-local-variable' or `make-variable-buffer-local' applied | |
| 875 to them. This object contains an alist mapping buffers to | |
| 876 values. In addition, the object contains a "current value", | |
| 877 which is the value in some buffer. Whenever you access the | |
| 878 variable with `symbol-value' or set it with `set' or `setq', | |
| 879 things are switched around so that the "current value" | |
| 880 refers to the current buffer, if it wasn't already. This | |
| 881 way, repeated references to a variable in the same buffer | |
| 882 are almost as efficient as if the variable weren't buffer | |
| 883 local. Note that the alist may not be up-to-date w.r.t. | |
| 884 the buffer whose value is current, as the "current value" | |
| 885 cache is normally only flushed into the alist when the | |
| 886 buffer it refers to changes. | |
| 887 | |
| 888 Note also that it is possible for `make-local-variable' | |
| 889 or `make-variable-buffer-local' to be called on a variable | |
| 890 that forwards into a C variable (i.e. a variable whose | |
| 891 value cell is a symbol-value-forward). In this case, | |
| 892 the value cell becomes a symbol-value-buffer-local (as | |
| 893 always), and the symbol-value-forward moves into | |
| 894 the "current value" cell in this object. Also, in | |
| 895 this case the "current value" *always* refers to the | |
| 896 current buffer, so that the values of the C variable | |
| 897 always is the correct value for the current buffer. | |
| 898 set_buffer_internal() automatically updates the current-value | |
| 899 cells of all buffer-local variables that forward into C | |
| 900 variables. (There is a list of all buffer-local variables | |
| 901 that is maintained for this and other purposes.) | |
| 902 | |
| 903 Note that only certain types of `symbol-value-forward' objects | |
| 904 can find their way into the "current value" cell of a | |
| 905 `symbol-value-buffer-local' object: SYMVAL_OBJECT_FORWARD, | |
| 906 SYMVAL_FIXNUM_FORWARD, SYMVAL_BOOLEAN_FORWARD, and | |
| 907 SYMVAL_UNBOUND_MARKER. The SYMVAL_CONST_*_FORWARD cannot | |
| 908 be buffer-local because they are unsettable; | |
| 909 SYMVAL_DEFAULT_*_FORWARD cannot be buffer-local because that | |
| 910 makes no sense; making SYMVAL_CURRENT_BUFFER_FORWARD buffer-local | |
| 911 does not have much of an effect (it's already buffer-local); and | |
| 912 SYMVAL_SELECTED_CONSOLE_FORWARD cannot be buffer-local because | |
| 913 that's not currently implemented. | |
| 914 | |
| 915 | |
| 916 3. symbol-value-varalias | |
| 917 | |
| 918 A symbol-value-varalias object is used for variables that | |
| 919 are aliases for other variables. This object contains | |
| 920 the symbol that this variable is aliased to. | |
| 921 symbol-value-varalias objects cannot occur anywhere within | |
| 922 a symbol-value-buffer-local object, and most of the | |
| 923 low-level functions below do not accept them; you need | |
| 924 to call follow_varalias_pointers to get the actual | |
| 925 symbol to operate on. */ | |
| 926 | |
| 1204 | 927 static const struct memory_description symbol_value_buffer_local_description[] = { |
| 928 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, default_value) }, | |
| 929 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_value) }, | |
| 930 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_buffer) }, | |
| 931 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_alist_element) }, | |
| 932 { XD_END } | |
| 933 }; | |
| 934 | |
| 428 | 935 static Lisp_Object |
| 936 mark_symbol_value_buffer_local (Lisp_Object obj) | |
| 937 { | |
| 938 struct symbol_value_buffer_local *bfwd; | |
| 939 | |
| 800 | 940 #ifdef ERROR_CHECK_TYPES |
| 428 | 941 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_BUFFER_LOCAL || |
| 942 XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_SOME_BUFFER_LOCAL); | |
| 943 #endif | |
| 944 | |
| 945 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (obj); | |
| 946 mark_object (bfwd->default_value); | |
| 947 mark_object (bfwd->current_value); | |
| 948 mark_object (bfwd->current_buffer); | |
| 949 return bfwd->current_alist_element; | |
| 950 } | |
| 951 | |
| 1204 | 952 |
| 953 static const struct memory_description symbol_value_lisp_magic_description[] = { | |
| 954 { XD_LISP_OBJECT_ARRAY, offsetof (struct symbol_value_lisp_magic, handler), MAGIC_HANDLER_MAX }, | |
| 955 { XD_LISP_OBJECT_ARRAY, offsetof (struct symbol_value_lisp_magic, harg), MAGIC_HANDLER_MAX }, | |
| 956 { XD_LISP_OBJECT, offsetof (struct symbol_value_lisp_magic, shadowed) }, | |
| 957 { XD_END } | |
| 958 }; | |
| 959 | |
| 428 | 960 static Lisp_Object |
| 961 mark_symbol_value_lisp_magic (Lisp_Object obj) | |
| 962 { | |
| 963 struct symbol_value_lisp_magic *bfwd; | |
| 964 int i; | |
| 965 | |
| 966 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_LISP_MAGIC); | |
| 967 | |
| 968 bfwd = XSYMBOL_VALUE_LISP_MAGIC (obj); | |
| 969 for (i = 0; i < MAGIC_HANDLER_MAX; i++) | |
| 970 { | |
| 971 mark_object (bfwd->handler[i]); | |
| 972 mark_object (bfwd->harg[i]); | |
| 973 } | |
| 974 return bfwd->shadowed; | |
| 975 } | |
| 976 | |
| 1204 | 977 static const struct memory_description symbol_value_varalias_description[] = { |
| 978 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, aliasee) }, | |
| 979 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, shadowed) }, | |
| 980 { XD_END } | |
| 981 }; | |
| 982 | |
| 428 | 983 static Lisp_Object |
| 984 mark_symbol_value_varalias (Lisp_Object obj) | |
| 985 { | |
| 986 struct symbol_value_varalias *bfwd; | |
| 987 | |
| 988 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_VARALIAS); | |
| 989 | |
| 990 bfwd = XSYMBOL_VALUE_VARALIAS (obj); | |
| 991 mark_object (bfwd->shadowed); | |
| 992 return bfwd->aliasee; | |
| 993 } | |
| 994 | |
| 995 /* Should never, ever be called. (except by an external debugger) */ | |
| 996 void | |
| 2286 | 997 print_symbol_value_magic (Lisp_Object obj, Lisp_Object printcharfun, |
| 998 int UNUSED (escapeflag)) | |
| 428 | 999 { |
| 800 | 1000 write_fmt_string (printcharfun, |
| 1001 "#<INTERNAL OBJECT (XEmacs bug?) (%s type %d) 0x%lx>", | |
| 1002 XRECORD_LHEADER_IMPLEMENTATION (obj)->name, | |
| 1003 XSYMBOL_VALUE_MAGIC_TYPE (obj), | |
| 1004 (long) XPNTR (obj)); | |
| 428 | 1005 } |
| 1006 | |
| 1204 | 1007 static const struct memory_description symbol_value_forward_description[] = { |
| 428 | 1008 { XD_END } |
| 1009 }; | |
| 1010 | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
1011 DEFINE_LISP_OBJECT ("symbol-value-forward", |
| 934 | 1012 symbol_value_forward, |
| 1013 0, | |
| 1014 print_symbol_value_magic, 0, 0, 0, | |
| 1015 symbol_value_forward_description, | |
| 1016 struct symbol_value_forward); | |
| 1017 | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
1018 DEFINE_LISP_OBJECT ("symbol-value-buffer-local", |
| 934 | 1019 symbol_value_buffer_local, |
| 1020 mark_symbol_value_buffer_local, | |
| 1021 print_symbol_value_magic, 0, 0, 0, | |
| 1022 symbol_value_buffer_local_description, | |
| 1023 struct symbol_value_buffer_local); | |
| 1024 | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
1025 DEFINE_LISP_OBJECT ("symbol-value-lisp-magic", |
| 934 | 1026 symbol_value_lisp_magic, |
| 1027 mark_symbol_value_lisp_magic, | |
| 1028 print_symbol_value_magic, 0, 0, 0, | |
| 1029 symbol_value_lisp_magic_description, | |
| 1030 struct symbol_value_lisp_magic); | |
| 1031 | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
1032 DEFINE_LISP_OBJECT ("symbol-value-varalias", |
| 934 | 1033 symbol_value_varalias, |
| 1034 mark_symbol_value_varalias, | |
| 1035 print_symbol_value_magic, 0, 0, 0, | |
| 1036 symbol_value_varalias_description, | |
| 1037 struct symbol_value_varalias); | |
| 1038 | |
| 428 | 1039 |
| 1040 /* Getting and setting values of symbols */ | |
| 1041 | |
| 1042 /* Given the raw contents of a symbol value cell, return the Lisp value of | |
| 1043 the symbol. However, VALCONTENTS cannot be a symbol-value-buffer-local, | |
| 1044 symbol-value-lisp-magic, or symbol-value-varalias. | |
| 1045 | |
| 1046 BUFFER specifies a buffer, and is used for built-in buffer-local | |
| 1047 variables, which are of type SYMVAL_CURRENT_BUFFER_FORWARD. | |
| 1048 Note that such variables are never encapsulated in a | |
| 1049 symbol-value-buffer-local structure. | |
| 1050 | |
| 1051 CONSOLE specifies a console, and is used for built-in console-local | |
| 1052 variables, which are of type SYMVAL_SELECTED_CONSOLE_FORWARD. | |
| 1053 Note that such variables are (currently) never encapsulated in a | |
| 1054 symbol-value-buffer-local structure. | |
| 1055 */ | |
| 1056 | |
| 1057 static Lisp_Object | |
| 1058 do_symval_forwarding (Lisp_Object valcontents, struct buffer *buffer, | |
| 1059 struct console *console) | |
| 1060 { | |
| 442 | 1061 const struct symbol_value_forward *fwd; |
| 428 | 1062 |
| 1063 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1064 return valcontents; | |
| 1065 | |
| 1066 fwd = XSYMBOL_VALUE_FORWARD (valcontents); | |
| 1067 switch (fwd->magic.type) | |
| 1068 { | |
| 1069 case SYMVAL_FIXNUM_FORWARD: | |
| 1070 case SYMVAL_CONST_FIXNUM_FORWARD: | |
| 458 | 1071 return make_int (*((Fixnum *)symbol_value_forward_forward (fwd))); |
| 428 | 1072 |
| 1073 case SYMVAL_BOOLEAN_FORWARD: | |
| 1074 case SYMVAL_CONST_BOOLEAN_FORWARD: | |
| 1075 return *((int *)symbol_value_forward_forward (fwd)) ? Qt : Qnil; | |
| 1076 | |
| 1077 case SYMVAL_OBJECT_FORWARD: | |
| 1078 case SYMVAL_CONST_OBJECT_FORWARD: | |
| 1079 case SYMVAL_CONST_SPECIFIER_FORWARD: | |
| 1080 return *((Lisp_Object *)symbol_value_forward_forward (fwd)); | |
| 1081 | |
| 1082 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 1083 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults) | |
| 1084 + ((char *)symbol_value_forward_forward (fwd) | |
| 1085 - (char *)&buffer_local_flags)))); | |
| 1086 | |
| 1087 | |
| 1088 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1089 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: | |
| 1090 assert (buffer); | |
| 1091 return (*((Lisp_Object *)((char *)buffer | |
| 1092 + ((char *)symbol_value_forward_forward (fwd) | |
| 1093 - (char *)&buffer_local_flags)))); | |
| 1094 | |
| 1095 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 1096 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults) | |
| 1097 + ((char *)symbol_value_forward_forward (fwd) | |
| 1098 - (char *)&console_local_flags)))); | |
| 1099 | |
| 1100 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1101 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: | |
| 1102 assert (console); | |
| 1103 return (*((Lisp_Object *)((char *)console | |
| 1104 + ((char *)symbol_value_forward_forward (fwd) | |
| 1105 - (char *)&console_local_flags)))); | |
| 1106 | |
| 1107 case SYMVAL_UNBOUND_MARKER: | |
| 1108 return valcontents; | |
| 1109 | |
| 1110 default: | |
| 2500 | 1111 ABORT (); |
| 428 | 1112 } |
| 1113 return Qnil; /* suppress compiler warning */ | |
| 1114 } | |
| 1115 | |
| 1116 /* Set the value of default-buffer-local variable SYM to VALUE. */ | |
| 1117 | |
| 1118 static void | |
| 1119 set_default_buffer_slot_variable (Lisp_Object sym, | |
| 1120 Lisp_Object value) | |
| 1121 { | |
| 1122 /* Handle variables like case-fold-search that have special slots in | |
| 1123 the buffer. Make them work apparently like buffer_local variables. | |
| 1124 */ | |
| 1125 /* At this point, the value cell may not contain a symbol-value-varalias | |
| 1126 or symbol-value-buffer-local, and if there's a handler, we should | |
| 1127 have already called it. */ | |
| 1128 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt); | |
| 442 | 1129 const struct symbol_value_forward *fwd |
| 428 | 1130 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1131 int offset = ((char *) symbol_value_forward_forward (fwd) | |
| 1132 - (char *) &buffer_local_flags); | |
| 1133 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); | |
| 1134 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object, | |
| 1135 int flags) = symbol_value_forward_magicfun (fwd); | |
| 1136 | |
| 1137 *((Lisp_Object *) (offset + (char *) XBUFFER (Vbuffer_defaults))) | |
| 1138 = value; | |
| 1139 | |
| 1140 if (mask > 0) /* Not always per-buffer */ | |
| 1141 { | |
| 1142 /* Set value in each buffer which hasn't shadowed the default */ | |
| 1143 LIST_LOOP_2 (elt, Vbuffer_alist) | |
| 1144 { | |
| 1145 struct buffer *b = XBUFFER (XCDR (elt)); | |
| 1146 if (!(b->local_var_flags & mask)) | |
| 1147 { | |
| 1148 if (magicfun) | |
| 771 | 1149 magicfun (sym, &value, wrap_buffer (b), 0); |
| 428 | 1150 *((Lisp_Object *) (offset + (char *) b)) = value; |
| 1151 } | |
| 1152 } | |
| 1153 } | |
| 1154 } | |
| 1155 | |
| 1156 /* Set the value of default-console-local variable SYM to VALUE. */ | |
| 1157 | |
| 1158 static void | |
| 1159 set_default_console_slot_variable (Lisp_Object sym, | |
| 1160 Lisp_Object value) | |
| 1161 { | |
| 1162 /* Handle variables like case-fold-search that have special slots in | |
| 1163 the console. Make them work apparently like console_local variables. | |
| 1164 */ | |
| 1165 /* At this point, the value cell may not contain a symbol-value-varalias | |
| 1166 or symbol-value-buffer-local, and if there's a handler, we should | |
| 1167 have already called it. */ | |
| 1168 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt); | |
| 442 | 1169 const struct symbol_value_forward *fwd |
| 428 | 1170 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1171 int offset = ((char *) symbol_value_forward_forward (fwd) | |
| 1172 - (char *) &console_local_flags); | |
| 1173 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); | |
| 1174 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object, | |
| 1175 int flags) = symbol_value_forward_magicfun (fwd); | |
| 1176 | |
| 1177 *((Lisp_Object *) (offset + (char *) XCONSOLE (Vconsole_defaults))) | |
| 1178 = value; | |
| 1179 | |
| 1180 if (mask > 0) /* Not always per-console */ | |
| 1181 { | |
| 1182 /* Set value in each console which hasn't shadowed the default */ | |
| 1183 LIST_LOOP_2 (console, Vconsole_list) | |
| 1184 { | |
| 1185 struct console *d = XCONSOLE (console); | |
| 1186 if (!(d->local_var_flags & mask)) | |
| 1187 { | |
| 1188 if (magicfun) | |
| 1189 magicfun (sym, &value, console, 0); | |
| 1190 *((Lisp_Object *) (offset + (char *) d)) = value; | |
| 1191 } | |
| 1192 } | |
| 1193 } | |
| 1194 } | |
| 1195 | |
| 1196 /* Store NEWVAL into SYM. | |
| 1197 | |
| 1198 SYM's value slot may *not* be types (5) or (6) above, | |
| 1199 i.e. no symbol-value-varalias objects. (You should have | |
| 1200 forwarded past all of these.) | |
| 1201 | |
| 1202 SYM should not be an unsettable symbol or a symbol with | |
| 1203 a magic `set-value' handler (unless you want to explicitly | |
| 1204 ignore this handler). | |
| 1205 | |
| 1206 OVALUE is the current value of SYM, but forwarded past any | |
| 1207 symbol-value-buffer-local and symbol-value-lisp-magic objects. | |
| 1208 (i.e. if SYM is a symbol-value-buffer-local, OVALUE should be | |
| 1209 the contents of its current-value cell.) NEWVAL may only be | |
| 1210 a simple value or Qunbound. If SYM is a symbol-value-buffer-local, | |
| 1211 this function will only modify its current-value cell, which should | |
| 1212 already be set up to point to the current buffer. | |
| 1213 */ | |
| 1214 | |
| 1215 static void | |
| 1216 store_symval_forwarding (Lisp_Object sym, Lisp_Object ovalue, | |
| 1217 Lisp_Object newval) | |
| 1218 { | |
| 1219 if (!SYMBOL_VALUE_MAGIC_P (ovalue) || UNBOUNDP (ovalue)) | |
| 1220 { | |
| 1221 Lisp_Object *store_pointer = value_slot_past_magic (sym); | |
| 1222 | |
| 1223 if (SYMBOL_VALUE_BUFFER_LOCAL_P (*store_pointer)) | |
| 1224 store_pointer = | |
| 1225 &XSYMBOL_VALUE_BUFFER_LOCAL (*store_pointer)->current_value; | |
| 1226 | |
| 1227 assert (UNBOUNDP (*store_pointer) | |
| 1228 || !SYMBOL_VALUE_MAGIC_P (*store_pointer)); | |
| 1229 *store_pointer = newval; | |
| 1230 } | |
| 1231 else | |
| 1232 { | |
| 442 | 1233 const struct symbol_value_forward *fwd = XSYMBOL_VALUE_FORWARD (ovalue); |
| 428 | 1234 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, |
| 1235 Lisp_Object in_object, int flags) | |
| 1236 = symbol_value_forward_magicfun (fwd); | |
| 1237 | |
| 1238 switch (XSYMBOL_VALUE_MAGIC_TYPE (ovalue)) | |
| 1239 { | |
| 1240 case SYMVAL_FIXNUM_FORWARD: | |
| 1241 CHECK_INT (newval); | |
| 1242 if (magicfun) | |
| 1243 magicfun (sym, &newval, Qnil, 0); | |
| 458 | 1244 *((Fixnum *) symbol_value_forward_forward (fwd)) = XINT (newval); |
| 428 | 1245 return; |
| 1246 | |
| 1247 case SYMVAL_BOOLEAN_FORWARD: | |
| 1248 if (magicfun) | |
| 1249 magicfun (sym, &newval, Qnil, 0); | |
| 1250 *((int *) symbol_value_forward_forward (fwd)) | |
| 1251 = !NILP (newval); | |
| 1252 return; | |
| 1253 | |
| 1254 case SYMVAL_OBJECT_FORWARD: | |
| 1255 if (magicfun) | |
| 1256 magicfun (sym, &newval, Qnil, 0); | |
| 1257 *((Lisp_Object *) symbol_value_forward_forward (fwd)) = newval; | |
| 1258 return; | |
| 1259 | |
| 1260 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 1261 set_default_buffer_slot_variable (sym, newval); | |
| 1262 return; | |
| 1263 | |
| 1264 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1265 if (magicfun) | |
| 771 | 1266 magicfun (sym, &newval, wrap_buffer (current_buffer), 0); |
| 428 | 1267 *((Lisp_Object *) ((char *) current_buffer |
| 1268 + ((char *) symbol_value_forward_forward (fwd) | |
| 1269 - (char *) &buffer_local_flags))) | |
| 1270 = newval; | |
| 1271 return; | |
| 1272 | |
| 1273 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 1274 set_default_console_slot_variable (sym, newval); | |
| 1275 return; | |
| 1276 | |
| 1277 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1278 if (magicfun) | |
| 1279 magicfun (sym, &newval, Vselected_console, 0); | |
| 1280 *((Lisp_Object *) ((char *) XCONSOLE (Vselected_console) | |
| 1281 + ((char *) symbol_value_forward_forward (fwd) | |
| 1282 - (char *) &console_local_flags))) | |
| 1283 = newval; | |
| 1284 return; | |
| 1285 | |
| 1286 default: | |
| 2500 | 1287 ABORT (); |
| 428 | 1288 } |
| 1289 } | |
| 1290 } | |
| 1291 | |
| 1292 /* Given a per-buffer variable SYMBOL and its raw value-cell contents | |
| 1293 BFWD, locate and return a pointer to the element in BUFFER's | |
| 1294 local_var_alist for SYMBOL. The return value will be Qnil if | |
| 1295 BUFFER does not have its own value for SYMBOL (i.e. the default | |
| 1296 value is seen in that buffer). | |
| 1297 */ | |
| 1298 | |
| 1299 static Lisp_Object | |
| 1300 buffer_local_alist_element (struct buffer *buffer, Lisp_Object symbol, | |
| 1301 struct symbol_value_buffer_local *bfwd) | |
| 1302 { | |
| 1303 if (!NILP (bfwd->current_buffer) && | |
| 1304 XBUFFER (bfwd->current_buffer) == buffer) | |
| 1305 /* This is just an optimization of the below. */ | |
| 1306 return bfwd->current_alist_element; | |
| 1307 else | |
| 1308 return assq_no_quit (symbol, buffer->local_var_alist); | |
| 1309 } | |
| 1310 | |
| 1311 /* [Remember that the slot that mirrors CURRENT-VALUE in the | |
| 1312 symbol-value-buffer-local of a per-buffer variable -- i.e. the | |
| 1313 slot in CURRENT-BUFFER's local_var_alist, or the DEFAULT-VALUE | |
| 1314 slot -- may be out of date.] | |
| 1315 | |
| 1316 Write out any cached value in buffer-local variable SYMBOL's | |
| 1317 buffer-local structure, which is passed in as BFWD. | |
| 1318 */ | |
| 1319 | |
| 1320 static void | |
| 2286 | 1321 write_out_buffer_local_cache (Lisp_Object UNUSED (symbol), |
| 428 | 1322 struct symbol_value_buffer_local *bfwd) |
| 1323 { | |
| 1324 if (!NILP (bfwd->current_buffer)) | |
| 1325 { | |
| 1326 /* We pass 0 for BUFFER because only SYMVAL_CURRENT_BUFFER_FORWARD | |
| 1327 uses it, and that type cannot be inside a symbol-value-buffer-local */ | |
| 1328 Lisp_Object cval = do_symval_forwarding (bfwd->current_value, 0, 0); | |
| 1329 if (NILP (bfwd->current_alist_element)) | |
| 1330 /* current_value may be updated more recently than default_value */ | |
| 1331 bfwd->default_value = cval; | |
| 1332 else | |
| 1333 Fsetcdr (bfwd->current_alist_element, cval); | |
| 1334 } | |
| 1335 } | |
| 1336 | |
| 1337 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure. | |
| 1338 Set up BFWD's cache for validity in buffer BUF. This assumes that | |
| 1339 the cache is currently in a consistent state (this can include | |
| 1340 not having any value cached, if BFWD->CURRENT_BUFFER is nil). | |
| 1341 | |
| 1342 If the cache is already set up for BUF, this function does nothing | |
| 1343 at all. | |
| 1344 | |
| 1345 Otherwise, if SYM forwards out to a C variable, this also forwards | |
| 1346 SYM's value in BUF out to the variable. Therefore, you generally | |
| 1347 only want to call this when BUF is, or is about to become, the | |
| 1348 current buffer. | |
| 1349 | |
| 1350 (Otherwise, you can just retrieve the value without changing the | |
| 1351 cache, at the expense of slower retrieval.) | |
| 1352 */ | |
| 1353 | |
| 1354 static void | |
| 1355 set_up_buffer_local_cache (Lisp_Object sym, | |
| 1356 struct symbol_value_buffer_local *bfwd, | |
| 1357 struct buffer *buf, | |
| 1358 Lisp_Object new_alist_el, | |
| 1359 int set_it_p) | |
| 1360 { | |
| 1361 Lisp_Object new_val; | |
| 1362 | |
| 1363 if (!NILP (bfwd->current_buffer) | |
| 1364 && buf == XBUFFER (bfwd->current_buffer)) | |
| 1365 /* Cache is already set up. */ | |
| 1366 return; | |
| 1367 | |
| 1368 /* Flush out the old cache. */ | |
| 1369 write_out_buffer_local_cache (sym, bfwd); | |
| 1370 | |
| 1371 /* Retrieve the new alist element and new value. */ | |
| 1372 if (NILP (new_alist_el) | |
| 1373 && set_it_p) | |
| 1374 new_alist_el = buffer_local_alist_element (buf, sym, bfwd); | |
| 1375 | |
| 1376 if (NILP (new_alist_el)) | |
| 1377 new_val = bfwd->default_value; | |
| 1378 else | |
| 1379 new_val = Fcdr (new_alist_el); | |
| 1380 | |
| 1381 bfwd->current_alist_element = new_alist_el; | |
| 793 | 1382 bfwd->current_buffer = wrap_buffer (buf); |
| 428 | 1383 |
| 1384 /* Now store the value into the current-value slot. | |
| 1385 We don't simply write it there, because the current-value | |
| 1386 slot might be a forwarding pointer, in which case we need | |
| 1387 to instead write the value into the C variable. | |
| 1388 | |
| 1389 We might also want to call a magic function. | |
| 1390 | |
| 1391 So instead, we call this function. */ | |
| 1392 store_symval_forwarding (sym, bfwd->current_value, new_val); | |
| 1393 } | |
| 1394 | |
| 446 | 1395 |
| 1396 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure. | |
| 1397 Flush the cache. BFWD->CURRENT_BUFFER will be nil after this operation. | |
| 1398 */ | |
| 1399 | |
| 1400 static void | |
| 1401 flush_buffer_local_cache (Lisp_Object sym, | |
| 1402 struct symbol_value_buffer_local *bfwd) | |
| 1403 { | |
| 1404 if (NILP (bfwd->current_buffer)) | |
| 1405 /* Cache is already flushed. */ | |
| 1406 return; | |
| 1407 | |
| 1408 /* Flush out the old cache. */ | |
| 1409 write_out_buffer_local_cache (sym, bfwd); | |
| 1410 | |
| 1411 bfwd->current_alist_element = Qnil; | |
| 1412 bfwd->current_buffer = Qnil; | |
| 1413 | |
| 1414 /* Now store default the value into the current-value slot. | |
| 1415 We don't simply write it there, because the current-value | |
| 1416 slot might be a forwarding pointer, in which case we need | |
| 1417 to instead write the value into the C variable. | |
| 1418 | |
| 1419 We might also want to call a magic function. | |
| 1420 | |
| 1421 So instead, we call this function. */ | |
| 1422 store_symval_forwarding (sym, bfwd->current_value, bfwd->default_value); | |
| 1423 } | |
| 1424 | |
| 1425 /* Flush all the buffer-local variable caches. Whoever has a | |
| 1426 non-interned buffer-local variable will be spanked. Whoever has a | |
| 1427 magic variable that interns or uninterns symbols... I don't even | |
| 1428 want to think about it. | |
| 1429 */ | |
| 1430 | |
| 1431 void | |
| 1432 flush_all_buffer_local_cache (void) | |
| 1433 { | |
| 1434 Lisp_Object *syms = XVECTOR_DATA (Vobarray); | |
| 1435 long count = XVECTOR_LENGTH (Vobarray); | |
| 1436 long i; | |
| 1437 | |
| 1438 for (i=0; i<count; i++) | |
| 1439 { | |
| 1440 Lisp_Object sym = syms[i]; | |
| 1441 Lisp_Object value; | |
| 1442 | |
| 1443 if (!ZEROP (sym)) | |
| 1444 for(;;) | |
| 1445 { | |
| 1446 Lisp_Symbol *next; | |
| 1447 assert (SYMBOLP (sym)); | |
| 1448 value = fetch_value_maybe_past_magic (sym, Qt); | |
| 1449 if (SYMBOL_VALUE_BUFFER_LOCAL_P (value)) | |
| 1450 flush_buffer_local_cache (sym, XSYMBOL_VALUE_BUFFER_LOCAL (value)); | |
| 1451 | |
| 1452 next = symbol_next (XSYMBOL (sym)); | |
| 1453 if (!next) | |
| 1454 break; | |
| 793 | 1455 sym = wrap_symbol (next); |
| 446 | 1456 } |
| 1457 } | |
| 1458 } | |
| 1459 | |
| 428 | 1460 |
| 1461 void | |
| 1462 kill_buffer_local_variables (struct buffer *buf) | |
| 1463 { | |
| 1464 Lisp_Object prev = Qnil; | |
| 1465 Lisp_Object alist; | |
| 1466 | |
| 1467 /* Any which are supposed to be permanent, | |
| 1468 make local again, with the same values they had. */ | |
| 1469 | |
| 1470 for (alist = buf->local_var_alist; !NILP (alist); alist = XCDR (alist)) | |
| 1471 { | |
| 1472 Lisp_Object sym = XCAR (XCAR (alist)); | |
| 1473 struct symbol_value_buffer_local *bfwd; | |
| 1474 /* Variables with a symbol-value-varalias should not be here | |
| 1475 (we should have forwarded past them) and there must be a | |
| 1476 symbol-value-buffer-local. If there's a symbol-value-lisp-magic, | |
| 1477 just forward past it; if the variable has a handler, it was | |
| 1478 already called. */ | |
| 1479 Lisp_Object value = fetch_value_maybe_past_magic (sym, Qt); | |
| 1480 | |
| 1481 assert (SYMBOL_VALUE_BUFFER_LOCAL_P (value)); | |
| 1482 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (value); | |
| 1483 | |
| 1484 if (!NILP (Fget (sym, Qpermanent_local, Qnil))) | |
| 1485 /* prev points to the last alist element that is still | |
| 1486 staying around, so *only* update it now. This didn't | |
| 1487 used to be the case; this bug has been around since | |
| 1488 mly's rewrite two years ago! */ | |
| 1489 prev = alist; | |
| 1490 else | |
| 1491 { | |
| 1492 /* Really truly kill it. */ | |
| 1493 if (!NILP (prev)) | |
| 1494 XCDR (prev) = XCDR (alist); | |
| 1495 else | |
| 1496 buf->local_var_alist = XCDR (alist); | |
| 1497 | |
| 1498 /* We just effectively changed the value for this variable | |
| 1499 in BUF. So: */ | |
| 1500 | |
| 1501 /* (1) If the cache is caching BUF, invalidate the cache. */ | |
| 1502 if (!NILP (bfwd->current_buffer) && | |
| 1503 buf == XBUFFER (bfwd->current_buffer)) | |
| 1504 bfwd->current_buffer = Qnil; | |
| 1505 | |
| 1506 /* (2) If we changed the value in current_buffer and this | |
| 1507 variable forwards to a C variable, we need to change the | |
| 1508 value of the C variable. set_up_buffer_local_cache() | |
| 1509 will do this. It doesn't hurt to do it whenever | |
| 1510 BUF == current_buffer, so just go ahead and do that. */ | |
| 1511 if (buf == current_buffer) | |
| 1512 set_up_buffer_local_cache (sym, bfwd, buf, Qnil, 0); | |
| 1513 } | |
| 1514 } | |
| 1515 } | |
| 1516 | |
| 1517 static Lisp_Object | |
| 1518 find_symbol_value_1 (Lisp_Object sym, struct buffer *buf, | |
| 1519 struct console *con, int swap_it_in, | |
| 1520 Lisp_Object symcons, int set_it_p) | |
| 1521 { | |
| 1522 Lisp_Object valcontents; | |
| 1523 | |
| 1524 retry: | |
| 1525 valcontents = XSYMBOL (sym)->value; | |
| 1526 | |
| 1527 retry_2: | |
| 1528 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1529 return valcontents; | |
| 1530 | |
| 1531 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 1532 { | |
| 1533 case SYMVAL_LISP_MAGIC: | |
| 1534 /* #### kludge */ | |
| 1535 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 1536 /* semi-change-o */ | |
| 1537 goto retry_2; | |
| 1538 | |
| 1539 case SYMVAL_VARALIAS: | |
| 1540 sym = follow_varalias_pointers (sym, Qt /* #### kludge */); | |
| 1541 symcons = Qnil; | |
| 1542 /* presto change-o! */ | |
| 1543 goto retry; | |
| 1544 | |
| 1545 case SYMVAL_BUFFER_LOCAL: | |
| 1546 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 1547 { | |
| 1548 struct symbol_value_buffer_local *bfwd | |
| 1549 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 1550 | |
| 1551 if (swap_it_in) | |
| 1552 { | |
| 1553 set_up_buffer_local_cache (sym, bfwd, buf, symcons, set_it_p); | |
| 1554 valcontents = bfwd->current_value; | |
| 1555 } | |
| 1556 else | |
| 1557 { | |
| 1558 if (!NILP (bfwd->current_buffer) && | |
| 1559 buf == XBUFFER (bfwd->current_buffer)) | |
| 1560 valcontents = bfwd->current_value; | |
| 1561 else if (NILP (symcons)) | |
| 1562 { | |
| 1563 if (set_it_p) | |
| 1564 valcontents = assq_no_quit (sym, buf->local_var_alist); | |
| 1565 if (NILP (valcontents)) | |
| 1566 valcontents = bfwd->default_value; | |
| 1567 else | |
| 1568 valcontents = XCDR (valcontents); | |
| 1569 } | |
| 1570 else | |
| 1571 valcontents = XCDR (symcons); | |
| 1572 } | |
| 1573 break; | |
| 1574 } | |
| 1575 | |
| 1576 default: | |
| 1577 break; | |
| 1578 } | |
| 1579 return do_symval_forwarding (valcontents, buf, con); | |
| 1580 } | |
| 1581 | |
| 1582 | |
| 1583 /* Find the value of a symbol in BUFFER, returning Qunbound if it's not | |
| 1584 bound. Note that it must not be possible to QUIT within this | |
| 1585 function. */ | |
| 1586 | |
| 1587 Lisp_Object | |
| 1588 symbol_value_in_buffer (Lisp_Object sym, Lisp_Object buffer) | |
| 1589 { | |
| 1590 struct buffer *buf; | |
| 1591 | |
| 1592 CHECK_SYMBOL (sym); | |
| 1593 | |
| 1594 if (NILP (buffer)) | |
| 1595 buf = current_buffer; | |
| 1596 else | |
| 1597 { | |
| 1598 CHECK_BUFFER (buffer); | |
| 1599 buf = XBUFFER (buffer); | |
| 1600 } | |
| 1601 | |
| 1602 return find_symbol_value_1 (sym, buf, | |
| 1603 /* If it bombs out at startup due to a | |
| 1604 Lisp error, this may be nil. */ | |
| 1605 CONSOLEP (Vselected_console) | |
| 1606 ? XCONSOLE (Vselected_console) : 0, 0, Qnil, 1); | |
| 1607 } | |
| 1608 | |
| 1609 static Lisp_Object | |
| 1610 symbol_value_in_console (Lisp_Object sym, Lisp_Object console) | |
| 1611 { | |
| 1612 CHECK_SYMBOL (sym); | |
| 1613 | |
| 1614 if (NILP (console)) | |
| 1615 console = Vselected_console; | |
| 1616 else | |
| 1617 CHECK_CONSOLE (console); | |
| 1618 | |
| 1619 return find_symbol_value_1 (sym, current_buffer, XCONSOLE (console), 0, | |
| 1620 Qnil, 1); | |
| 1621 } | |
| 1622 | |
| 1623 /* Return the current value of SYM. The difference between this function | |
| 1624 and calling symbol_value_in_buffer with a BUFFER of Qnil is that | |
| 1625 this updates the CURRENT_VALUE slot of buffer-local variables to | |
| 1626 point to the current buffer, while symbol_value_in_buffer doesn't. */ | |
| 1627 | |
| 1628 Lisp_Object | |
| 1629 find_symbol_value (Lisp_Object sym) | |
| 1630 { | |
| 1631 /* WARNING: This function can be called when current_buffer is 0 | |
| 1632 and Vselected_console is Qnil, early in initialization. */ | |
| 1633 struct console *con; | |
| 1634 Lisp_Object valcontents; | |
| 1635 | |
| 1636 CHECK_SYMBOL (sym); | |
| 1637 | |
| 1638 valcontents = XSYMBOL (sym)->value; | |
| 1639 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1640 return valcontents; | |
| 1641 | |
| 1642 if (CONSOLEP (Vselected_console)) | |
| 1643 con = XCONSOLE (Vselected_console); | |
| 1644 else | |
| 1645 { | |
| 1646 /* This can also get called while we're preparing to shutdown. | |
| 1647 #### What should really happen in that case? Should we | |
| 1648 actually fix things so we can't get here in that case? */ | |
| 1649 #ifndef PDUMP | |
| 1650 assert (!initialized || preparing_for_armageddon); | |
| 1651 #endif | |
| 1652 con = 0; | |
| 1653 } | |
| 1654 | |
| 1655 return find_symbol_value_1 (sym, current_buffer, con, 1, Qnil, 1); | |
| 1656 } | |
| 1657 | |
| 1658 /* This is an optimized function for quick lookup of buffer local symbols | |
| 1659 by avoiding O(n) search. This will work when either: | |
| 1660 a) We have already found the symbol e.g. by traversing local_var_alist. | |
| 1661 or | |
| 1662 b) We know that the symbol will not be found in the current buffer's | |
| 1663 list of local variables. | |
| 1664 In the former case, find_it_p is 1 and symbol_cons is the element from | |
| 1665 local_var_alist. In the latter case, find_it_p is 0 and symbol_cons | |
| 1666 is the symbol. | |
| 1667 | |
| 1668 This function is called from set_buffer_internal which does both of these | |
| 1669 things. */ | |
| 1670 | |
| 1671 Lisp_Object | |
| 1672 find_symbol_value_quickly (Lisp_Object symbol_cons, int find_it_p) | |
| 1673 { | |
| 1674 /* WARNING: This function can be called when current_buffer is 0 | |
| 1675 and Vselected_console is Qnil, early in initialization. */ | |
| 1676 struct console *con; | |
| 1677 Lisp_Object sym = find_it_p ? XCAR (symbol_cons) : symbol_cons; | |
| 1678 | |
| 1679 CHECK_SYMBOL (sym); | |
| 1680 if (CONSOLEP (Vselected_console)) | |
| 1681 con = XCONSOLE (Vselected_console); | |
| 1682 else | |
| 1683 { | |
| 1684 /* This can also get called while we're preparing to shutdown. | |
| 1685 #### What should really happen in that case? Should we | |
| 1686 actually fix things so we can't get here in that case? */ | |
| 1687 #ifndef PDUMP | |
| 1688 assert (!initialized || preparing_for_armageddon); | |
| 1689 #endif | |
| 1690 con = 0; | |
| 1691 } | |
| 1692 | |
| 1693 return find_symbol_value_1 (sym, current_buffer, con, 1, | |
| 1694 find_it_p ? symbol_cons : Qnil, | |
| 1695 find_it_p); | |
| 1696 } | |
| 1697 | |
| 1698 DEFUN ("symbol-value", Fsymbol_value, 1, 1, 0, /* | |
| 1699 Return SYMBOL's value. Error if that is void. | |
| 1700 */ | |
| 1701 (symbol)) | |
| 1702 { | |
| 1703 Lisp_Object val = find_symbol_value (symbol); | |
| 1704 | |
| 1705 if (UNBOUNDP (val)) | |
| 1706 return Fsignal (Qvoid_variable, list1 (symbol)); | |
| 1707 else | |
| 1708 return val; | |
| 1709 } | |
| 1710 | |
| 1711 DEFUN ("set", Fset, 2, 2, 0, /* | |
| 1712 Set SYMBOL's value to NEWVAL, and return NEWVAL. | |
| 1713 */ | |
| 1714 (symbol, newval)) | |
| 1715 { | |
| 1716 REGISTER Lisp_Object valcontents; | |
| 440 | 1717 Lisp_Symbol *sym; |
| 428 | 1718 /* remember, we're called by Fmakunbound() as well */ |
| 1719 | |
| 1720 CHECK_SYMBOL (symbol); | |
| 1721 | |
| 1722 retry: | |
| 1723 sym = XSYMBOL (symbol); | |
| 1724 valcontents = sym->value; | |
| 1725 | |
| 1726 if (EQ (symbol, Qnil) || | |
| 1727 EQ (symbol, Qt) || | |
| 1728 SYMBOL_IS_KEYWORD (symbol)) | |
| 1729 reject_constant_symbols (symbol, newval, 0, | |
| 1730 UNBOUNDP (newval) ? Qmakunbound : Qset); | |
| 1731 | |
| 1732 if (!SYMBOL_VALUE_MAGIC_P (valcontents) || UNBOUNDP (valcontents)) | |
| 1733 { | |
| 1734 sym->value = newval; | |
| 1735 return newval; | |
| 1736 } | |
| 1737 | |
| 1738 reject_constant_symbols (symbol, newval, 0, | |
| 1739 UNBOUNDP (newval) ? Qmakunbound : Qset); | |
| 1740 | |
| 1741 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 1742 { | |
| 1743 case SYMVAL_LISP_MAGIC: | |
| 1744 { | |
| 1745 if (UNBOUNDP (newval)) | |
| 440 | 1746 { |
| 1747 maybe_call_magic_handler (symbol, Qmakunbound, 0); | |
| 1748 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = Qunbound; | |
| 1749 } | |
| 428 | 1750 else |
| 440 | 1751 { |
| 1752 maybe_call_magic_handler (symbol, Qset, 1, newval); | |
| 1753 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = newval; | |
| 1754 } | |
| 428 | 1755 } |
| 1756 | |
| 1757 case SYMVAL_VARALIAS: | |
| 1758 symbol = follow_varalias_pointers (symbol, | |
| 1759 UNBOUNDP (newval) | |
| 1760 ? Qmakunbound : Qset); | |
| 1761 /* presto change-o! */ | |
| 1762 goto retry; | |
| 1763 | |
| 1764 case SYMVAL_FIXNUM_FORWARD: | |
| 996 | 1765 case SYMVAL_CONST_FIXNUM_FORWARD: |
| 428 | 1766 case SYMVAL_BOOLEAN_FORWARD: |
| 996 | 1767 case SYMVAL_CONST_BOOLEAN_FORWARD: |
| 428 | 1768 case SYMVAL_DEFAULT_BUFFER_FORWARD: |
| 1769 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 1770 if (UNBOUNDP (newval)) | |
| 996 | 1771 { |
| 1772 #ifdef HAVE_SHLIB | |
| 1773 if (unloading_module) | |
| 1774 { | |
| 1775 sym->value = newval; | |
| 1776 return newval; | |
| 1777 } | |
| 1778 else | |
| 1779 #endif | |
| 1780 invalid_change ("Cannot makunbound", symbol); | |
| 1781 } | |
| 1782 break; | |
| 1783 | |
| 1784 case SYMVAL_OBJECT_FORWARD: | |
| 1785 case SYMVAL_CONST_OBJECT_FORWARD: | |
| 1786 if (UNBOUNDP (newval)) | |
| 1787 { | |
| 1788 #ifdef HAVE_SHLIB | |
| 1789 if (unloading_module) | |
| 1790 { | |
| 1111 | 1791 unstaticpro_nodump ((Lisp_Object *) |
| 1792 symbol_value_forward_forward | |
| 996 | 1793 (XSYMBOL_VALUE_FORWARD (valcontents))); |
| 1794 sym->value = newval; | |
| 1795 return newval; | |
| 1796 } | |
| 1797 else | |
| 1798 #endif | |
| 1799 invalid_change ("Cannot makunbound", symbol); | |
| 1800 } | |
| 428 | 1801 break; |
| 1802 | |
| 1803 /* case SYMVAL_UNBOUND_MARKER: break; */ | |
| 1804 | |
| 1805 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1806 { | |
| 442 | 1807 const struct symbol_value_forward *fwd |
| 428 | 1808 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1809 int mask = XINT (*((Lisp_Object *) | |
| 1810 symbol_value_forward_forward (fwd))); | |
| 1811 if (mask > 0) | |
| 1812 /* Setting this variable makes it buffer-local */ | |
| 1813 current_buffer->local_var_flags |= mask; | |
| 1814 break; | |
| 1815 } | |
| 1816 | |
| 1817 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1818 { | |
| 442 | 1819 const struct symbol_value_forward *fwd |
| 428 | 1820 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1821 int mask = XINT (*((Lisp_Object *) | |
| 1822 symbol_value_forward_forward (fwd))); | |
| 1823 if (mask > 0) | |
| 1824 /* Setting this variable makes it console-local */ | |
| 1825 XCONSOLE (Vselected_console)->local_var_flags |= mask; | |
| 1826 break; | |
| 1827 } | |
| 1828 | |
| 1829 case SYMVAL_BUFFER_LOCAL: | |
| 1830 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 1831 { | |
| 1832 /* If we want to examine or set the value and | |
| 1833 CURRENT-BUFFER is current, we just examine or set | |
| 1834 CURRENT-VALUE. If CURRENT-BUFFER is not current, we | |
| 1835 store the current CURRENT-VALUE value into | |
| 1836 CURRENT-ALIST- ELEMENT, then find the appropriate alist | |
| 1837 element for the buffer now current and set up | |
| 1838 CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE out | |
| 1839 of that element, and store into CURRENT-BUFFER. | |
| 1840 | |
| 1841 If we are setting the variable and the current buffer does | |
| 1842 not have an alist entry for this variable, an alist entry is | |
| 1843 created. | |
| 1844 | |
| 1845 Note that CURRENT-VALUE can be a forwarding pointer. | |
| 1846 Each time it is examined or set, forwarding must be | |
| 1847 done. */ | |
| 1848 struct symbol_value_buffer_local *bfwd | |
| 1849 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 1850 int some_buffer_local_p = | |
| 1851 (bfwd->magic.type == SYMVAL_SOME_BUFFER_LOCAL); | |
| 1852 /* What value are we caching right now? */ | |
| 1853 Lisp_Object aelt = bfwd->current_alist_element; | |
| 1854 | |
| 1855 if (!NILP (bfwd->current_buffer) && | |
| 1856 current_buffer == XBUFFER (bfwd->current_buffer) | |
| 1857 && ((some_buffer_local_p) | |
| 1858 ? 1 /* doesn't automatically become local */ | |
| 1859 : !NILP (aelt) /* already local */ | |
| 1860 )) | |
| 1861 { | |
| 1862 /* Cache is valid */ | |
| 1863 valcontents = bfwd->current_value; | |
| 1864 } | |
| 1865 else | |
| 1866 { | |
| 1867 /* If the current buffer is not the buffer whose binding is | |
| 1868 currently cached, or if it's a SYMVAL_BUFFER_LOCAL and | |
| 1869 we're looking at the default value, the cache is invalid; we | |
| 1870 need to write it out, and find the new CURRENT-ALIST-ELEMENT | |
| 1871 */ | |
| 1872 | |
| 1873 /* Write out the cached value for the old buffer; copy it | |
| 1874 back to its alist element. This works if the current | |
| 1875 buffer only sees the default value, too. */ | |
| 1876 write_out_buffer_local_cache (symbol, bfwd); | |
| 1877 | |
| 1878 /* Find the new value for CURRENT-ALIST-ELEMENT. */ | |
| 1879 aelt = buffer_local_alist_element (current_buffer, symbol, bfwd); | |
| 1880 if (NILP (aelt)) | |
| 1881 { | |
| 1882 /* This buffer is still seeing the default value. */ | |
| 1883 if (!some_buffer_local_p) | |
| 1884 { | |
| 1885 /* If it's a SYMVAL_BUFFER_LOCAL, give this buffer a | |
| 1886 new assoc for a local value and set | |
| 1887 CURRENT-ALIST-ELEMENT to point to that. */ | |
| 1888 aelt = | |
| 1889 do_symval_forwarding (bfwd->current_value, | |
| 1890 current_buffer, | |
| 1891 XCONSOLE (Vselected_console)); | |
| 1892 aelt = Fcons (symbol, aelt); | |
| 1893 current_buffer->local_var_alist | |
| 1894 = Fcons (aelt, current_buffer->local_var_alist); | |
| 1895 } | |
| 1896 else | |
| 1897 { | |
| 1898 /* If the variable is a SYMVAL_SOME_BUFFER_LOCAL, | |
| 1899 we're currently seeing the default value. */ | |
| 1900 ; | |
| 1901 } | |
| 1902 } | |
| 1903 /* Cache the new buffer's assoc in CURRENT-ALIST-ELEMENT. */ | |
| 1904 bfwd->current_alist_element = aelt; | |
| 1905 /* Set BUFFER, now that CURRENT-ALIST-ELEMENT is accurate. */ | |
| 793 | 1906 bfwd->current_buffer = wrap_buffer (current_buffer); |
| 428 | 1907 valcontents = bfwd->current_value; |
| 1908 } | |
| 1909 break; | |
| 1910 } | |
| 1911 default: | |
| 2500 | 1912 ABORT (); |
| 428 | 1913 } |
| 1914 store_symval_forwarding (symbol, valcontents, newval); | |
| 1915 | |
| 1916 return newval; | |
| 1917 } | |
| 1918 | |
| 1919 | |
| 1920 /* Access or set a buffer-local symbol's default value. */ | |
| 1921 | |
| 1922 /* Return the default value of SYM, but don't check for voidness. | |
| 1923 Return Qunbound if it is void. */ | |
| 1924 | |
| 1925 static Lisp_Object | |
| 1926 default_value (Lisp_Object sym) | |
| 1927 { | |
| 1928 Lisp_Object valcontents; | |
| 1929 | |
| 1930 CHECK_SYMBOL (sym); | |
| 1931 | |
| 1932 retry: | |
| 1933 valcontents = XSYMBOL (sym)->value; | |
| 1934 | |
| 1935 retry_2: | |
| 1936 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1937 return valcontents; | |
| 1938 | |
| 1939 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 1940 { | |
| 1941 case SYMVAL_LISP_MAGIC: | |
| 1942 /* #### kludge */ | |
| 1943 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 1944 /* semi-change-o */ | |
| 1945 goto retry_2; | |
| 1946 | |
| 1947 case SYMVAL_VARALIAS: | |
| 1948 sym = follow_varalias_pointers (sym, Qt /* #### kludge */); | |
| 1949 /* presto change-o! */ | |
| 1950 goto retry; | |
| 1951 | |
| 1952 case SYMVAL_UNBOUND_MARKER: | |
| 1953 return valcontents; | |
| 1954 | |
| 1955 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1956 { | |
| 442 | 1957 const struct symbol_value_forward *fwd |
| 428 | 1958 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1959 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults) | |
| 1960 + ((char *)symbol_value_forward_forward (fwd) | |
| 1961 - (char *)&buffer_local_flags)))); | |
| 1962 } | |
| 1963 | |
| 1964 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1965 { | |
| 442 | 1966 const struct symbol_value_forward *fwd |
| 428 | 1967 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1968 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults) | |
| 1969 + ((char *)symbol_value_forward_forward (fwd) | |
| 1970 - (char *)&console_local_flags)))); | |
| 1971 } | |
| 1972 | |
| 1973 case SYMVAL_BUFFER_LOCAL: | |
| 1974 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 1975 { | |
| 1976 struct symbol_value_buffer_local *bfwd = | |
| 1977 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 1978 | |
| 1979 /* Handle user-created local variables. */ | |
| 1980 /* If var is set up for a buffer that lacks a local value for it, | |
| 1981 the current value is nominally the default value. | |
| 1982 But the current value slot may be more up to date, since | |
| 1983 ordinary setq stores just that slot. So use that. */ | |
| 1984 if (NILP (bfwd->current_alist_element)) | |
| 1985 return do_symval_forwarding (bfwd->current_value, current_buffer, | |
| 1986 XCONSOLE (Vselected_console)); | |
| 1987 else | |
| 1988 return bfwd->default_value; | |
| 1989 } | |
| 1990 default: | |
| 1991 /* For other variables, get the current value. */ | |
| 1992 return do_symval_forwarding (valcontents, current_buffer, | |
| 1993 XCONSOLE (Vselected_console)); | |
| 1994 } | |
| 1995 | |
| 1204 | 1996 RETURN_NOT_REACHED (Qnil); /* suppress compiler warning */ |
| 428 | 1997 } |
| 1998 | |
| 1999 DEFUN ("default-boundp", Fdefault_boundp, 1, 1, 0, /* | |
| 2000 Return t if SYMBOL has a non-void default value. | |
| 2001 This is the value that is seen in buffers that do not have their own values | |
| 2002 for this variable. | |
| 2003 */ | |
| 2004 (symbol)) | |
| 2005 { | |
| 2006 return UNBOUNDP (default_value (symbol)) ? Qnil : Qt; | |
| 2007 } | |
| 2008 | |
| 2009 DEFUN ("default-value", Fdefault_value, 1, 1, 0, /* | |
| 2010 Return SYMBOL's default value. | |
| 2011 This is the value that is seen in buffers that do not have their own values | |
| 2012 for this variable. The default value is meaningful for variables with | |
| 2013 local bindings in certain buffers. | |
| 2014 */ | |
| 2015 (symbol)) | |
| 2016 { | |
| 2017 Lisp_Object value = default_value (symbol); | |
| 2018 | |
| 2019 return UNBOUNDP (value) ? Fsignal (Qvoid_variable, list1 (symbol)) : value; | |
| 2020 } | |
| 2021 | |
| 2022 DEFUN ("set-default", Fset_default, 2, 2, 0, /* | |
| 444 | 2023 Set SYMBOL's default value to VALUE. SYMBOL and VALUE are evaluated. |
| 428 | 2024 The default value is seen in buffers that do not have their own values |
| 2025 for this variable. | |
| 2026 */ | |
| 2027 (symbol, value)) | |
| 2028 { | |
| 2029 Lisp_Object valcontents; | |
| 2030 | |
| 2031 CHECK_SYMBOL (symbol); | |
| 2032 | |
| 2033 retry: | |
| 2034 valcontents = XSYMBOL (symbol)->value; | |
| 2035 | |
| 2036 retry_2: | |
| 2037 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2038 return Fset (symbol, value); | |
| 2039 | |
| 2040 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2041 { | |
| 2042 case SYMVAL_LISP_MAGIC: | |
| 2043 RETURN_IF_NOT_UNBOUND (maybe_call_magic_handler (symbol, Qset_default, 1, | |
| 2044 value)); | |
| 2045 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2046 /* semi-change-o */ | |
| 2047 goto retry_2; | |
| 2048 | |
| 2049 case SYMVAL_VARALIAS: | |
| 2050 symbol = follow_varalias_pointers (symbol, Qset_default); | |
| 2051 /* presto change-o! */ | |
| 2052 goto retry; | |
| 2053 | |
| 2054 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2055 set_default_buffer_slot_variable (symbol, value); | |
| 2056 return value; | |
| 2057 | |
| 2058 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 2059 set_default_console_slot_variable (symbol, value); | |
| 2060 return value; | |
| 2061 | |
| 2062 case SYMVAL_BUFFER_LOCAL: | |
| 2063 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2064 { | |
| 2065 /* Store new value into the DEFAULT-VALUE slot */ | |
| 2066 struct symbol_value_buffer_local *bfwd | |
| 2067 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2068 | |
| 2069 bfwd->default_value = value; | |
| 2070 /* If current-buffer doesn't shadow default_value, | |
| 2071 * we must set the CURRENT-VALUE slot too */ | |
| 2072 if (NILP (bfwd->current_alist_element)) | |
| 2073 store_symval_forwarding (symbol, bfwd->current_value, value); | |
| 2074 return value; | |
| 2075 } | |
| 2076 | |
| 2077 default: | |
| 2078 return Fset (symbol, value); | |
| 2079 } | |
| 2080 } | |
| 2081 | |
| 2082 DEFUN ("setq-default", Fsetq_default, 0, UNEVALLED, 0, /* | |
| 2083 Set the default value of variable SYMBOL to VALUE. | |
| 2084 SYMBOL, the variable name, is literal (not evaluated); | |
| 2085 VALUE is an expression and it is evaluated. | |
| 2086 The default value of a variable is seen in buffers | |
| 2087 that do not have their own values for the variable. | |
| 2088 | |
| 2089 More generally, you can use multiple variables and values, as in | |
| 2090 (setq-default SYMBOL VALUE SYMBOL VALUE...) | |
| 2091 This sets each SYMBOL's default value to the corresponding VALUE. | |
| 2092 The VALUE for the Nth SYMBOL can refer to the new default values | |
| 2093 of previous SYMBOLs. | |
| 2094 */ | |
| 2095 (args)) | |
| 2096 { | |
| 2097 /* This function can GC */ | |
| 2098 int nargs; | |
| 2421 | 2099 Lisp_Object retval = Qnil; |
| 428 | 2100 |
| 2101 GET_LIST_LENGTH (args, nargs); | |
| 2102 | |
| 2103 if (nargs & 1) /* Odd number of arguments? */ | |
| 2104 Fsignal (Qwrong_number_of_arguments, | |
| 2105 list2 (Qsetq_default, make_int (nargs))); | |
| 2106 | |
| 2421 | 2107 GC_PROPERTY_LIST_LOOP_3 (symbol, val, args) |
| 428 | 2108 { |
| 2109 val = Feval (val); | |
| 2110 Fset_default (symbol, val); | |
| 2421 | 2111 retval = val; |
| 428 | 2112 } |
| 2113 | |
| 2421 | 2114 END_GC_PROPERTY_LIST_LOOP (symbol); |
| 2115 return retval; | |
| 428 | 2116 } |
| 2117 | |
| 2118 /* Lisp functions for creating and removing buffer-local variables. */ | |
| 2119 | |
| 2120 DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, 1, 1, | |
| 2121 "vMake Variable Buffer Local: ", /* | |
| 2122 Make VARIABLE have a separate value for each buffer. | |
| 2123 At any time, the value for the current buffer is in effect. | |
| 2124 There is also a default value which is seen in any buffer which has not yet | |
| 2125 set its own value. | |
| 2126 Using `set' or `setq' to set the variable causes it to have a separate value | |
| 2127 for the current buffer if it was previously using the default value. | |
| 2128 The function `default-value' gets the default value and `set-default' | |
| 2129 sets it. | |
| 2130 */ | |
| 2131 (variable)) | |
| 2132 { | |
| 2133 Lisp_Object valcontents; | |
| 2134 | |
| 2135 CHECK_SYMBOL (variable); | |
| 2136 | |
| 2137 retry: | |
| 2138 verify_ok_for_buffer_local (variable, Qmake_variable_buffer_local); | |
| 2139 | |
| 2140 valcontents = XSYMBOL (variable)->value; | |
| 2141 | |
| 2142 retry_2: | |
| 2143 if (SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2144 { | |
| 2145 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2146 { | |
| 2147 case SYMVAL_LISP_MAGIC: | |
| 2148 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2149 (variable, Qmake_variable_buffer_local, 0))) | |
| 2150 return variable; | |
| 2151 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2152 /* semi-change-o */ | |
| 2153 goto retry_2; | |
| 2154 | |
| 2155 case SYMVAL_VARALIAS: | |
| 2156 variable = follow_varalias_pointers (variable, | |
| 2157 Qmake_variable_buffer_local); | |
| 2158 /* presto change-o! */ | |
| 2159 goto retry; | |
| 2160 | |
| 2161 case SYMVAL_FIXNUM_FORWARD: | |
| 2162 case SYMVAL_BOOLEAN_FORWARD: | |
| 2163 case SYMVAL_OBJECT_FORWARD: | |
| 2164 case SYMVAL_UNBOUND_MARKER: | |
| 2165 break; | |
| 2166 | |
| 2167 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2168 case SYMVAL_BUFFER_LOCAL: | |
| 2169 /* Already per-each-buffer */ | |
| 2170 return variable; | |
| 2171 | |
| 2172 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2173 /* Transmogrify */ | |
| 2174 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->magic.type = | |
| 2175 SYMVAL_BUFFER_LOCAL; | |
| 2176 return variable; | |
| 2177 | |
| 2178 default: | |
| 2500 | 2179 ABORT (); |
| 428 | 2180 } |
| 2181 } | |
| 2182 | |
| 2183 { | |
| 2184 struct symbol_value_buffer_local *bfwd | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
2185 = XSYMBOL_VALUE_BUFFER_LOCAL |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
2186 (ALLOC_LISP_OBJECT (symbol_value_buffer_local)); |
| 428 | 2187 Lisp_Object foo; |
| 2188 bfwd->magic.type = SYMVAL_BUFFER_LOCAL; | |
| 2189 | |
| 2190 bfwd->default_value = find_symbol_value (variable); | |
| 2191 bfwd->current_value = valcontents; | |
| 2192 bfwd->current_alist_element = Qnil; | |
| 2193 bfwd->current_buffer = Fcurrent_buffer (); | |
| 793 | 2194 foo = wrap_symbol_value_magic (bfwd); |
| 428 | 2195 *value_slot_past_magic (variable) = foo; |
| 2196 #if 1 /* #### Yuck! FSFmacs bug-compatibility*/ | |
| 2197 /* This sets the default-value of any make-variable-buffer-local to nil. | |
| 2198 That just sucks. User can just use setq-default to effect that, | |
| 2199 but there's no way to do makunbound-default to undo this lossage. */ | |
| 2200 if (UNBOUNDP (valcontents)) | |
| 2201 bfwd->default_value = Qnil; | |
| 2202 #endif | |
| 2203 #if 0 /* #### Yuck! */ | |
| 2204 /* This sets the value to nil in this buffer. | |
| 2205 User could use (setq variable nil) to do this. | |
| 2206 It isn't as egregious to do this automatically | |
| 2207 as it is to do so to the default-value, but it's | |
| 2208 still really dubious. */ | |
| 2209 if (UNBOUNDP (valcontents)) | |
| 2210 Fset (variable, Qnil); | |
| 2211 #endif | |
| 2212 return variable; | |
| 2213 } | |
| 2214 } | |
| 2215 | |
| 2216 DEFUN ("make-local-variable", Fmake_local_variable, 1, 1, | |
| 2217 "vMake Local Variable: ", /* | |
| 2218 Make VARIABLE have a separate value in the current buffer. | |
| 2219 Other buffers will continue to share a common default value. | |
| 2220 \(The buffer-local value of VARIABLE starts out as the same value | |
| 2221 VARIABLE previously had. If VARIABLE was void, it remains void.) | |
| 2222 See also `make-variable-buffer-local'. | |
| 2223 | |
| 2224 If the variable is already arranged to become local when set, | |
| 2225 this function causes a local value to exist for this buffer, | |
| 2226 just as setting the variable would do. | |
| 2227 | |
| 2228 Do not use `make-local-variable' to make a hook variable buffer-local. | |
| 2229 Use `make-local-hook' instead. | |
| 2230 */ | |
| 2231 (variable)) | |
| 2232 { | |
| 2233 Lisp_Object valcontents; | |
| 2234 struct symbol_value_buffer_local *bfwd; | |
| 2235 | |
| 2236 CHECK_SYMBOL (variable); | |
| 2237 | |
| 2238 retry: | |
| 2239 verify_ok_for_buffer_local (variable, Qmake_local_variable); | |
| 2240 | |
| 2241 valcontents = XSYMBOL (variable)->value; | |
| 2242 | |
| 2243 retry_2: | |
| 2244 if (SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2245 { | |
| 2246 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2247 { | |
| 2248 case SYMVAL_LISP_MAGIC: | |
| 2249 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2250 (variable, Qmake_local_variable, 0))) | |
| 2251 return variable; | |
| 2252 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2253 /* semi-change-o */ | |
| 2254 goto retry_2; | |
| 2255 | |
| 2256 case SYMVAL_VARALIAS: | |
| 2257 variable = follow_varalias_pointers (variable, Qmake_local_variable); | |
| 2258 /* presto change-o! */ | |
| 2259 goto retry; | |
| 2260 | |
| 2261 case SYMVAL_FIXNUM_FORWARD: | |
| 2262 case SYMVAL_BOOLEAN_FORWARD: | |
| 2263 case SYMVAL_OBJECT_FORWARD: | |
| 2264 case SYMVAL_UNBOUND_MARKER: | |
| 2265 break; | |
| 2266 | |
| 2267 case SYMVAL_BUFFER_LOCAL: | |
| 2268 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2269 { | |
| 2270 /* Make sure the symbol has a local value in this particular | |
| 2271 buffer, by setting it to the same value it already has. */ | |
| 2272 Fset (variable, find_symbol_value (variable)); | |
| 2273 return variable; | |
| 2274 } | |
| 2275 | |
| 2276 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2277 { | |
| 2278 if (!NILP (buffer_local_alist_element (current_buffer, | |
| 2279 variable, | |
| 2280 (XSYMBOL_VALUE_BUFFER_LOCAL | |
| 2281 (valcontents))))) | |
| 2282 goto already_local_to_current_buffer; | |
| 2283 else | |
| 2284 goto already_local_to_some_other_buffer; | |
| 2285 } | |
| 2286 | |
| 2287 default: | |
| 2500 | 2288 ABORT (); |
| 428 | 2289 } |
| 2290 } | |
| 2291 | |
| 2292 /* Make sure variable is set up to hold per-buffer values */ | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
2293 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
2294 (ALLOC_LISP_OBJECT (symbol_value_buffer_local)); |
| 428 | 2295 bfwd->magic.type = SYMVAL_SOME_BUFFER_LOCAL; |
| 2296 | |
| 2297 bfwd->current_buffer = Qnil; | |
| 2298 bfwd->current_alist_element = Qnil; | |
| 2299 bfwd->current_value = valcontents; | |
| 2300 /* passing 0 is OK because this should never be a | |
| 2301 SYMVAL_CURRENT_BUFFER_FORWARD or SYMVAL_SELECTED_CONSOLE_FORWARD | |
| 2302 variable. */ | |
| 2303 bfwd->default_value = do_symval_forwarding (valcontents, 0, 0); | |
| 2304 | |
| 2305 #if 0 | |
| 2306 if (UNBOUNDP (bfwd->default_value)) | |
| 2307 bfwd->default_value = Qnil; /* Yuck! */ | |
| 2308 #endif | |
| 2309 | |
| 793 | 2310 valcontents = wrap_symbol_value_magic (bfwd); |
| 428 | 2311 *value_slot_past_magic (variable) = valcontents; |
| 2312 | |
| 2313 already_local_to_some_other_buffer: | |
| 2314 | |
| 2315 /* Make sure this buffer has its own value of variable */ | |
| 2316 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2317 | |
| 2318 if (UNBOUNDP (bfwd->default_value)) | |
| 2319 { | |
| 2320 /* If default value is unbound, set local value to nil. */ | |
| 793 | 2321 bfwd->current_buffer = wrap_buffer (current_buffer); |
| 428 | 2322 bfwd->current_alist_element = Fcons (variable, Qnil); |
| 2323 current_buffer->local_var_alist = | |
| 2324 Fcons (bfwd->current_alist_element, current_buffer->local_var_alist); | |
| 2325 store_symval_forwarding (variable, bfwd->current_value, Qnil); | |
| 2326 return variable; | |
| 2327 } | |
| 2328 | |
| 2329 current_buffer->local_var_alist | |
| 2330 = Fcons (Fcons (variable, bfwd->default_value), | |
| 2331 current_buffer->local_var_alist); | |
| 2332 | |
| 2333 /* Make sure symbol does not think it is set up for this buffer; | |
| 2334 force it to look once again for this buffer's value */ | |
| 2335 if (!NILP (bfwd->current_buffer) && | |
| 2336 current_buffer == XBUFFER (bfwd->current_buffer)) | |
| 2337 bfwd->current_buffer = Qnil; | |
| 2338 | |
| 2339 already_local_to_current_buffer: | |
| 2340 | |
| 2341 /* If the symbol forwards into a C variable, then swap in the | |
| 2342 variable for this buffer immediately. If C code modifies the | |
| 2343 variable before we swap in, then that new value will clobber the | |
| 2344 default value the next time we swap. */ | |
| 2345 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2346 if (SYMBOL_VALUE_MAGIC_P (bfwd->current_value)) | |
| 2347 { | |
| 2348 switch (XSYMBOL_VALUE_MAGIC_TYPE (bfwd->current_value)) | |
| 2349 { | |
| 2350 case SYMVAL_FIXNUM_FORWARD: | |
| 2351 case SYMVAL_BOOLEAN_FORWARD: | |
| 2352 case SYMVAL_OBJECT_FORWARD: | |
| 2353 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 2354 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1); | |
| 2355 break; | |
| 2356 | |
| 2357 case SYMVAL_UNBOUND_MARKER: | |
| 2358 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2359 break; | |
| 2360 | |
| 2361 default: | |
| 2500 | 2362 ABORT (); |
| 428 | 2363 } |
| 2364 } | |
| 2365 | |
| 2366 return variable; | |
| 2367 } | |
| 2368 | |
| 2369 DEFUN ("kill-local-variable", Fkill_local_variable, 1, 1, | |
| 2370 "vKill Local Variable: ", /* | |
| 2371 Make VARIABLE no longer have a separate value in the current buffer. | |
| 2372 From now on the default value will apply in this buffer. | |
| 2373 */ | |
| 2374 (variable)) | |
| 2375 { | |
| 2376 Lisp_Object valcontents; | |
| 2377 | |
| 2378 CHECK_SYMBOL (variable); | |
| 2379 | |
| 2380 retry: | |
| 2381 valcontents = XSYMBOL (variable)->value; | |
| 2382 | |
| 2383 retry_2: | |
| 2384 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2385 return variable; | |
| 2386 | |
| 2387 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2388 { | |
| 2389 case SYMVAL_LISP_MAGIC: | |
| 2390 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2391 (variable, Qkill_local_variable, 0))) | |
| 2392 return variable; | |
| 2393 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2394 /* semi-change-o */ | |
| 2395 goto retry_2; | |
| 2396 | |
| 2397 case SYMVAL_VARALIAS: | |
| 2398 variable = follow_varalias_pointers (variable, Qkill_local_variable); | |
| 2399 /* presto change-o! */ | |
| 2400 goto retry; | |
| 2401 | |
| 2402 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2403 { | |
| 442 | 2404 const struct symbol_value_forward *fwd |
| 428 | 2405 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 2406 int offset = ((char *) symbol_value_forward_forward (fwd) | |
| 2407 - (char *) &buffer_local_flags); | |
| 2408 int mask = | |
| 2409 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); | |
| 2410 | |
| 2411 if (mask > 0) | |
| 2412 { | |
| 2413 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, | |
| 2414 Lisp_Object in_object, int flags) = | |
| 2415 symbol_value_forward_magicfun (fwd); | |
| 2416 Lisp_Object oldval = * (Lisp_Object *) | |
| 2417 (offset + (char *) XBUFFER (Vbuffer_defaults)); | |
| 2418 if (magicfun) | |
| 771 | 2419 (magicfun) (variable, &oldval, wrap_buffer (current_buffer), 0); |
| 428 | 2420 *(Lisp_Object *) (offset + (char *) current_buffer) |
| 2421 = oldval; | |
| 2422 current_buffer->local_var_flags &= ~mask; | |
| 2423 } | |
| 2424 return variable; | |
| 2425 } | |
| 2426 | |
| 2427 case SYMVAL_BUFFER_LOCAL: | |
| 2428 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2429 { | |
| 2430 /* Get rid of this buffer's alist element, if any */ | |
| 2431 struct symbol_value_buffer_local *bfwd | |
| 2432 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2433 Lisp_Object alist = current_buffer->local_var_alist; | |
| 2434 Lisp_Object alist_element | |
| 2435 = buffer_local_alist_element (current_buffer, variable, bfwd); | |
| 2436 | |
| 2437 if (!NILP (alist_element)) | |
| 2438 current_buffer->local_var_alist = Fdelq (alist_element, alist); | |
| 2439 | |
| 2440 /* Make sure symbol does not think it is set up for this buffer; | |
| 2441 force it to look once again for this buffer's value */ | |
| 2442 if (!NILP (bfwd->current_buffer) && | |
| 2443 current_buffer == XBUFFER (bfwd->current_buffer)) | |
| 2444 bfwd->current_buffer = Qnil; | |
| 2445 | |
| 2446 /* We just changed the value in the current_buffer. If this | |
| 2447 variable forwards to a C variable, we need to change the | |
| 2448 value of the C variable. set_up_buffer_local_cache() | |
| 2449 will do this. It doesn't hurt to do it always, | |
| 2450 so just go ahead and do that. */ | |
| 2451 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1); | |
| 2452 } | |
| 2453 return variable; | |
| 2454 | |
| 2455 default: | |
| 2456 return variable; | |
| 2457 } | |
| 1204 | 2458 RETURN_NOT_REACHED(Qnil); /* suppress compiler warning */ |
| 428 | 2459 } |
| 2460 | |
| 2461 | |
| 2462 DEFUN ("kill-console-local-variable", Fkill_console_local_variable, 1, 1, | |
| 2463 "vKill Console Local Variable: ", /* | |
| 2464 Make VARIABLE no longer have a separate value in the selected console. | |
| 2465 From now on the default value will apply in this console. | |
| 2466 */ | |
| 2467 (variable)) | |
| 2468 { | |
| 2469 Lisp_Object valcontents; | |
| 2470 | |
| 2471 CHECK_SYMBOL (variable); | |
| 2472 | |
| 2473 retry: | |
| 2474 valcontents = XSYMBOL (variable)->value; | |
| 2475 | |
| 2476 retry_2: | |
| 2477 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2478 return variable; | |
| 2479 | |
| 2480 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2481 { | |
| 2482 case SYMVAL_LISP_MAGIC: | |
| 2483 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2484 (variable, Qkill_console_local_variable, 0))) | |
| 2485 return variable; | |
| 2486 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2487 /* semi-change-o */ | |
| 2488 goto retry_2; | |
| 2489 | |
| 2490 case SYMVAL_VARALIAS: | |
| 2491 variable = follow_varalias_pointers (variable, | |
| 2492 Qkill_console_local_variable); | |
| 2493 /* presto change-o! */ | |
| 2494 goto retry; | |
| 2495 | |
| 2496 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 2497 { | |
| 442 | 2498 const struct symbol_value_forward *fwd |
| 428 | 2499 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 2500 int offset = ((char *) symbol_value_forward_forward (fwd) | |
| 2501 - (char *) &console_local_flags); | |
| 2502 int mask = | |
| 2503 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); | |
| 2504 | |
| 2505 if (mask > 0) | |
| 2506 { | |
| 2507 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, | |
| 2508 Lisp_Object in_object, int flags) = | |
| 2509 symbol_value_forward_magicfun (fwd); | |
| 2510 Lisp_Object oldval = * (Lisp_Object *) | |
| 2511 (offset + (char *) XCONSOLE (Vconsole_defaults)); | |
| 2512 if (magicfun) | |
| 2513 magicfun (variable, &oldval, Vselected_console, 0); | |
| 2514 *(Lisp_Object *) (offset + (char *) XCONSOLE (Vselected_console)) | |
| 2515 = oldval; | |
| 2516 XCONSOLE (Vselected_console)->local_var_flags &= ~mask; | |
| 2517 } | |
| 2518 return variable; | |
| 2519 } | |
| 2520 | |
| 2521 default: | |
| 2522 return variable; | |
| 2523 } | |
| 2524 } | |
| 2525 | |
| 2526 /* Used by specbind to determine what effects it might have. Returns: | |
| 2527 * 0 if symbol isn't buffer-local, and wouldn't be after it is set | |
| 2528 * <0 if symbol isn't presently buffer-local, but set would make it so | |
| 2529 * >0 if symbol is presently buffer-local | |
| 2530 */ | |
| 2531 int | |
| 2532 symbol_value_buffer_local_info (Lisp_Object symbol, struct buffer *buffer) | |
| 2533 { | |
| 2534 Lisp_Object valcontents; | |
| 2535 | |
| 2536 retry: | |
| 2537 valcontents = XSYMBOL (symbol)->value; | |
| 2538 | |
| 2539 retry_2: | |
| 2540 if (SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2541 { | |
| 2542 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2543 { | |
| 2544 case SYMVAL_LISP_MAGIC: | |
| 2545 /* #### kludge */ | |
| 2546 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2547 /* semi-change-o */ | |
| 2548 goto retry_2; | |
| 2549 | |
| 2550 case SYMVAL_VARALIAS: | |
| 2551 symbol = follow_varalias_pointers (symbol, Qt /* #### kludge */); | |
| 2552 /* presto change-o! */ | |
| 2553 goto retry; | |
| 2554 | |
| 2555 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2556 { | |
| 442 | 2557 const struct symbol_value_forward *fwd |
| 428 | 2558 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 2559 int mask = XINT (*((Lisp_Object *) | |
| 2560 symbol_value_forward_forward (fwd))); | |
| 2561 if ((mask <= 0) || (buffer && (buffer->local_var_flags & mask))) | |
| 2562 /* Already buffer-local */ | |
| 2563 return 1; | |
| 2564 else | |
| 2565 /* Would be buffer-local after set */ | |
| 2566 return -1; | |
| 2567 } | |
| 2568 case SYMVAL_BUFFER_LOCAL: | |
| 2569 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2570 { | |
| 2571 struct symbol_value_buffer_local *bfwd | |
| 2572 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2573 if (buffer | |
| 2574 && !NILP (buffer_local_alist_element (buffer, symbol, bfwd))) | |
| 2575 return 1; | |
| 2576 else | |
| 2577 /* Automatically becomes local when set */ | |
| 2578 return bfwd->magic.type == SYMVAL_BUFFER_LOCAL ? -1 : 0; | |
| 2579 } | |
| 2580 default: | |
| 2581 return 0; | |
| 2582 } | |
| 2583 } | |
| 2584 return 0; | |
| 2585 } | |
| 2586 | |
| 2587 | |
| 2588 DEFUN ("symbol-value-in-buffer", Fsymbol_value_in_buffer, 2, 3, 0, /* | |
| 2589 Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound. | |
| 2590 */ | |
| 2591 (symbol, buffer, unbound_value)) | |
| 2592 { | |
| 2593 Lisp_Object value; | |
| 2594 CHECK_SYMBOL (symbol); | |
| 2595 CHECK_BUFFER (buffer); | |
| 2596 value = symbol_value_in_buffer (symbol, buffer); | |
| 2597 return UNBOUNDP (value) ? unbound_value : value; | |
| 2598 } | |
| 2599 | |
| 2600 DEFUN ("symbol-value-in-console", Fsymbol_value_in_console, 2, 3, 0, /* | |
| 2601 Return the value of SYMBOL in CONSOLE, or UNBOUND-VALUE if it is unbound. | |
| 2602 */ | |
| 2603 (symbol, console, unbound_value)) | |
| 2604 { | |
| 2605 Lisp_Object value; | |
| 2606 CHECK_SYMBOL (symbol); | |
| 2607 CHECK_CONSOLE (console); | |
| 2608 value = symbol_value_in_console (symbol, console); | |
| 2609 return UNBOUNDP (value) ? unbound_value : value; | |
| 2610 } | |
| 2611 | |
| 2612 DEFUN ("built-in-variable-type", Fbuilt_in_variable_type, 1, 1, 0, /* | |
| 2613 If SYMBOL is a built-in variable, return info about this; else return nil. | |
| 2614 The returned info will be a symbol, one of | |
| 2615 | |
| 2616 `object' A simple built-in variable. | |
| 2617 `const-object' Same, but cannot be set. | |
| 2618 `integer' A built-in integer variable. | |
| 2619 `const-integer' Same, but cannot be set. | |
| 2620 `boolean' A built-in boolean variable. | |
| 2621 `const-boolean' Same, but cannot be set. | |
| 2622 `const-specifier' Always contains a specifier; e.g. `has-modeline-p'. | |
| 2623 `current-buffer' A built-in buffer-local variable. | |
| 2624 `const-current-buffer' Same, but cannot be set. | |
| 2625 `default-buffer' Forwards to the default value of a built-in | |
| 2626 buffer-local variable. | |
| 2627 `selected-console' A built-in console-local variable. | |
| 2628 `const-selected-console' Same, but cannot be set. | |
| 2629 `default-console' Forwards to the default value of a built-in | |
| 2630 console-local variable. | |
| 2631 */ | |
| 2632 (symbol)) | |
| 2633 { | |
| 2634 REGISTER Lisp_Object valcontents; | |
| 2635 | |
| 2636 CHECK_SYMBOL (symbol); | |
| 2637 | |
| 2638 retry: | |
| 2639 valcontents = XSYMBOL (symbol)->value; | |
| 2640 | |
| 2641 retry_2: | |
| 2642 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2643 return Qnil; | |
| 2644 | |
| 2645 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2646 { | |
| 2647 case SYMVAL_LISP_MAGIC: | |
| 2648 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2649 /* semi-change-o */ | |
| 2650 goto retry_2; | |
| 2651 | |
| 2652 case SYMVAL_VARALIAS: | |
| 2653 symbol = follow_varalias_pointers (symbol, Qt); | |
| 2654 /* presto change-o! */ | |
| 2655 goto retry; | |
| 2656 | |
| 2657 case SYMVAL_BUFFER_LOCAL: | |
| 2658 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2659 valcontents = | |
| 2660 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->current_value; | |
| 2661 /* semi-change-o */ | |
| 2662 goto retry_2; | |
| 2663 | |
| 2664 case SYMVAL_FIXNUM_FORWARD: return Qinteger; | |
| 2665 case SYMVAL_CONST_FIXNUM_FORWARD: return Qconst_integer; | |
| 2666 case SYMVAL_BOOLEAN_FORWARD: return Qboolean; | |
| 2667 case SYMVAL_CONST_BOOLEAN_FORWARD: return Qconst_boolean; | |
| 2668 case SYMVAL_OBJECT_FORWARD: return Qobject; | |
| 2669 case SYMVAL_CONST_OBJECT_FORWARD: return Qconst_object; | |
| 2670 case SYMVAL_CONST_SPECIFIER_FORWARD: return Qconst_specifier; | |
| 2671 case SYMVAL_DEFAULT_BUFFER_FORWARD: return Qdefault_buffer; | |
| 2672 case SYMVAL_CURRENT_BUFFER_FORWARD: return Qcurrent_buffer; | |
| 2673 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: return Qconst_current_buffer; | |
| 2674 case SYMVAL_DEFAULT_CONSOLE_FORWARD: return Qdefault_console; | |
| 2675 case SYMVAL_SELECTED_CONSOLE_FORWARD: return Qselected_console; | |
| 2676 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: return Qconst_selected_console; | |
| 2677 case SYMVAL_UNBOUND_MARKER: return Qnil; | |
| 2678 | |
| 2679 default: | |
| 2500 | 2680 ABORT (); return Qnil; |
| 428 | 2681 } |
| 2682 } | |
| 2683 | |
| 2684 | |
| 2685 DEFUN ("local-variable-p", Flocal_variable_p, 2, 3, 0, /* | |
| 2686 Return t if SYMBOL's value is local to BUFFER. | |
| 444 | 2687 If optional third arg AFTER-SET is non-nil, return t if SYMBOL would be |
| 428 | 2688 buffer-local after it is set, regardless of whether it is so presently. |
| 2689 A nil value for BUFFER is *not* the same as (current-buffer), but means | |
| 2690 "no buffer". Specifically: | |
| 2691 | |
| 2692 -- If BUFFER is nil and AFTER-SET is nil, a return value of t indicates that | |
| 2693 the variable is one of the special built-in variables that is always | |
| 2694 buffer-local. (This includes `buffer-file-name', `buffer-read-only', | |
| 2695 `buffer-undo-list', and others.) | |
| 2696 | |
| 2697 -- If BUFFER is nil and AFTER-SET is t, a return value of t indicates that | |
| 2698 the variable has had `make-variable-buffer-local' applied to it. | |
| 2699 */ | |
| 2700 (symbol, buffer, after_set)) | |
| 2701 { | |
| 2702 int local_info; | |
| 2703 | |
| 2704 CHECK_SYMBOL (symbol); | |
| 2705 if (!NILP (buffer)) | |
| 2706 { | |
| 2707 buffer = get_buffer (buffer, 1); | |
| 2708 local_info = symbol_value_buffer_local_info (symbol, XBUFFER (buffer)); | |
| 2709 } | |
| 2710 else | |
| 2711 { | |
| 2712 local_info = symbol_value_buffer_local_info (symbol, 0); | |
| 2713 } | |
| 2714 | |
| 2715 if (NILP (after_set)) | |
| 2716 return local_info > 0 ? Qt : Qnil; | |
| 2717 else | |
| 2718 return local_info != 0 ? Qt : Qnil; | |
| 2719 } | |
| 2720 | |
| 2721 | |
| 2722 /* | |
| 2723 I've gone ahead and partially implemented this because it's | |
| 2724 super-useful for dealing with the compatibility problems in supporting | |
| 2725 the old pointer-shape variables, and preventing people from `setq'ing | |
| 2726 the new variables. Any other way of handling this problem is way | |
| 2727 ugly, likely to be slow, and generally not something I want to waste | |
| 2728 my time worrying about. | |
| 2729 | |
| 2730 The interface and/or function name is sure to change before this | |
| 2731 gets into its final form. I currently like the way everything is | |
| 2732 set up and it has all the features I want it to have, except for | |
| 2733 one: I really want to be able to have multiple nested handlers, | |
| 2734 to implement an `advice'-like capability. This would allow, | |
| 2735 for example, a clean way of implementing `debug-if-set' or | |
| 2736 `debug-if-referenced' and such. | |
| 2737 | |
| 2738 NOTE NOTE NOTE NOTE NOTE NOTE NOTE: | |
| 2739 ************************************************************ | |
| 2740 **Only** the `set-value', `make-unbound', and `make-local' | |
| 2741 handler types are currently implemented. Implementing the | |
| 2742 get-value and bound-predicate handlers is somewhat tricky | |
| 2743 because there are lots of subfunctions (e.g. find_symbol_value()). | |
| 2744 find_symbol_value(), in fact, is called from outside of | |
| 2745 this module. You'd have to have it do this: | |
| 2746 | |
| 2747 -- check for a `bound-predicate' handler, call that if so; | |
| 2748 if it returns nil, return Qunbound | |
| 2749 -- check for a `get-value' handler and call it and return | |
| 2750 that value | |
| 2751 | |
| 2752 It gets even trickier when you have to deal with | |
| 2753 sub-subfunctions like find_symbol_value_1(), and esp. | |
| 2754 when you have to properly handle variable aliases, which | |
| 2755 can lead to lots of tricky situations. So I've just | |
| 2756 punted on this, since the interface isn't officially | |
| 2757 exported and we can get by with just a `set-value' | |
| 2758 handler. | |
| 2759 | |
| 2760 Actions in unimplemented handler types will correctly | |
| 2761 ignore any handlers, and will not fuck anything up or | |
| 2762 go awry. | |
| 2763 | |
| 2764 WARNING WARNING: If you do go and implement another | |
| 2765 type of handler, make *sure* to change | |
| 2766 would_be_magic_handled() so it knows about this, | |
| 2767 or dire things could result. | |
| 2768 ************************************************************ | |
| 2769 NOTE NOTE NOTE NOTE NOTE NOTE NOTE | |
| 2770 | |
| 2771 Real documentation is as follows. | |
| 2772 | |
| 2773 Set a magic handler for VARIABLE. | |
| 2774 This allows you to specify arbitrary behavior that results from | |
| 2775 accessing or setting a variable. For example, retrieving the | |
| 2776 variable's value might actually retrieve the first element off of | |
| 2777 a list stored in another variable, and setting the variable's value | |
| 2778 might add an element to the front of that list. (This is how the | |
| 2779 obsolete variable `unread-command-event' is implemented.) | |
| 2780 | |
| 2781 In general it is NOT good programming practice to use magic variables | |
| 2782 in a new package that you are designing. If you feel the need to | |
| 2783 do this, it's almost certainly a sign that you should be using a | |
| 2784 function instead of a variable. This facility is provided to allow | |
| 2785 a package to support obsolete variables and provide compatibility | |
| 2786 with similar packages with different variable names and semantics. | |
| 2787 By using magic handlers, you can cleanly provide obsoleteness and | |
| 2788 compatibility support and separate this support from the core | |
| 2789 routines in a package. | |
| 2790 | |
| 2791 VARIABLE should be a symbol naming the variable for which the | |
| 2792 magic behavior is provided. HANDLER-TYPE is a symbol specifying | |
| 2793 which behavior is being controlled, and HANDLER is the function | |
| 2794 that will be called to control this behavior. HARG is a | |
| 2795 value that will be passed to HANDLER but is otherwise | |
| 2796 uninterpreted. KEEP-EXISTING specifies what to do with existing | |
| 2797 handlers of the same type; nil means "erase them all", t means | |
| 2798 "keep them but insert at the beginning", the list (t) means | |
| 2799 "keep them but insert at the end", a function means "keep | |
| 2800 them but insert before the specified function", a list containing | |
| 2801 a function means "keep them but insert after the specified | |
| 2802 function". | |
| 2803 | |
| 2804 You can specify magic behavior for any type of variable at all, | |
| 2805 and for any handler types that are unspecified, the standard | |
| 2806 behavior applies. This allows you, for example, to use | |
| 2807 `defvaralias' in conjunction with this function. (For that | |
| 2808 matter, `defvaralias' could be implemented using this function.) | |
| 2809 | |
| 2810 The behaviors that can be specified in HANDLER-TYPE are | |
| 2811 | |
| 2812 get-value (SYM ARGS FUN HARG HANDLERS) | |
| 2813 This means that one of the functions `symbol-value', | |
| 2814 `default-value', `symbol-value-in-buffer', or | |
| 2815 `symbol-value-in-console' was called on SYM. | |
| 2816 | |
| 2817 set-value (SYM ARGS FUN HARG HANDLERS) | |
| 2818 This means that one of the functions `set' or `set-default' | |
| 2819 was called on SYM. | |
| 2820 | |
| 2821 bound-predicate (SYM ARGS FUN HARG HANDLERS) | |
| 2822 This means that one of the functions `boundp', `globally-boundp', | |
| 2823 or `default-boundp' was called on SYM. | |
| 2824 | |
| 2825 make-unbound (SYM ARGS FUN HARG HANDLERS) | |
| 2826 This means that the function `makunbound' was called on SYM. | |
| 2827 | |
| 2828 local-predicate (SYM ARGS FUN HARG HANDLERS) | |
| 2829 This means that the function `local-variable-p' was called | |
| 2830 on SYM. | |
| 2831 | |
| 2832 make-local (SYM ARGS FUN HARG HANDLERS) | |
| 2833 This means that one of the functions `make-local-variable', | |
| 2834 `make-variable-buffer-local', `kill-local-variable', | |
| 2835 or `kill-console-local-variable' was called on SYM. | |
| 2836 | |
| 2837 The meanings of the arguments are as follows: | |
| 2838 | |
| 2839 SYM is the symbol on which the function was called, and is always | |
| 2840 the first argument to the function. | |
| 2841 | |
| 2842 ARGS are the remaining arguments in the original call (i.e. all | |
| 2843 but the first). In the case of `set-value' in particular, | |
| 2844 the first element of ARGS is the value to which the variable | |
| 2845 is being set. In some cases, ARGS is sanitized from what was | |
| 2846 actually given. For example, whenever `nil' is passed to an | |
| 2847 argument and it means `current-buffer', the current buffer is | |
| 2848 substituted instead. | |
| 2849 | |
| 2850 FUN is a symbol indicating which function is being called. | |
| 2851 For many of the functions, you can determine the corresponding | |
| 2852 function of a different class using | |
| 2853 `symbol-function-corresponding-function'. | |
| 2854 | |
| 2855 HARG is the argument that was given in the call | |
| 2856 to `set-symbol-value-handler' for SYM and HANDLER-TYPE. | |
| 2857 | |
| 2858 HANDLERS is a structure containing the remaining handlers | |
| 2859 for the variable; to call one of them, use | |
| 2860 `chain-to-symbol-value-handler'. | |
| 2861 | |
| 2862 NOTE: You may *not* modify the list in ARGS, and if you want to | |
| 2863 keep it around after the handler function exits, you must make | |
| 2864 a copy using `copy-sequence'. (Same caveats for HANDLERS also.) | |
| 2865 */ | |
| 2866 | |
| 2867 static enum lisp_magic_handler | |
| 2868 decode_magic_handler_type (Lisp_Object symbol) | |
| 2869 { | |
| 2870 if (EQ (symbol, Qget_value)) return MAGIC_HANDLER_GET_VALUE; | |
| 2871 if (EQ (symbol, Qset_value)) return MAGIC_HANDLER_SET_VALUE; | |
| 2872 if (EQ (symbol, Qbound_predicate)) return MAGIC_HANDLER_BOUND_PREDICATE; | |
| 2873 if (EQ (symbol, Qmake_unbound)) return MAGIC_HANDLER_MAKE_UNBOUND; | |
| 2874 if (EQ (symbol, Qlocal_predicate)) return MAGIC_HANDLER_LOCAL_PREDICATE; | |
| 2875 if (EQ (symbol, Qmake_local)) return MAGIC_HANDLER_MAKE_LOCAL; | |
| 2876 | |
| 563 | 2877 invalid_constant ("Unrecognized symbol value handler type", symbol); |
| 1204 | 2878 RETURN_NOT_REACHED (MAGIC_HANDLER_MAX); |
| 428 | 2879 } |
| 2880 | |
| 2881 static enum lisp_magic_handler | |
| 2882 handler_type_from_function_symbol (Lisp_Object funsym, int abort_if_not_found) | |
| 2883 { | |
| 2884 if (EQ (funsym, Qsymbol_value) | |
| 2885 || EQ (funsym, Qdefault_value) | |
| 2886 || EQ (funsym, Qsymbol_value_in_buffer) | |
| 2887 || EQ (funsym, Qsymbol_value_in_console)) | |
| 2888 return MAGIC_HANDLER_GET_VALUE; | |
| 2889 | |
| 2890 if (EQ (funsym, Qset) | |
| 2891 || EQ (funsym, Qset_default)) | |
| 2892 return MAGIC_HANDLER_SET_VALUE; | |
| 2893 | |
| 2894 if (EQ (funsym, Qboundp) | |
| 2895 || EQ (funsym, Qglobally_boundp) | |
| 2896 || EQ (funsym, Qdefault_boundp)) | |
| 2897 return MAGIC_HANDLER_BOUND_PREDICATE; | |
| 2898 | |
| 2899 if (EQ (funsym, Qmakunbound)) | |
| 2900 return MAGIC_HANDLER_MAKE_UNBOUND; | |
| 2901 | |
| 2902 if (EQ (funsym, Qlocal_variable_p)) | |
| 2903 return MAGIC_HANDLER_LOCAL_PREDICATE; | |
| 2904 | |
| 2905 if (EQ (funsym, Qmake_variable_buffer_local) | |
| 2906 || EQ (funsym, Qmake_local_variable)) | |
| 2907 return MAGIC_HANDLER_MAKE_LOCAL; | |
| 2908 | |
| 2909 if (abort_if_not_found) | |
| 2500 | 2910 ABORT (); |
| 563 | 2911 invalid_argument ("Unrecognized symbol-value function", funsym); |
| 1204 | 2912 RETURN_NOT_REACHED (MAGIC_HANDLER_MAX); |
| 428 | 2913 } |
| 2914 | |
| 2915 static int | |
| 2916 would_be_magic_handled (Lisp_Object sym, Lisp_Object funsym) | |
| 2917 { | |
| 2918 /* does not take into account variable aliasing. */ | |
| 2919 Lisp_Object valcontents = XSYMBOL (sym)->value; | |
| 2920 enum lisp_magic_handler slot; | |
| 2921 | |
| 2922 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents)) | |
| 2923 return 0; | |
| 2924 slot = handler_type_from_function_symbol (funsym, 1); | |
| 2925 if (slot != MAGIC_HANDLER_SET_VALUE && slot != MAGIC_HANDLER_MAKE_UNBOUND | |
| 2926 && slot != MAGIC_HANDLER_MAKE_LOCAL) | |
| 2927 /* #### temporary kludge because we haven't implemented | |
| 2928 lisp-magic variables completely */ | |
| 2929 return 0; | |
| 2930 return !NILP (XSYMBOL_VALUE_LISP_MAGIC (valcontents)->handler[slot]); | |
| 2931 } | |
| 2932 | |
| 2933 static Lisp_Object | |
| 2934 fetch_value_maybe_past_magic (Lisp_Object sym, | |
| 2935 Lisp_Object follow_past_lisp_magic) | |
| 2936 { | |
| 2937 Lisp_Object value = XSYMBOL (sym)->value; | |
| 2938 if (SYMBOL_VALUE_LISP_MAGIC_P (value) | |
| 2939 && (EQ (follow_past_lisp_magic, Qt) | |
| 2940 || (!NILP (follow_past_lisp_magic) | |
| 2941 && !would_be_magic_handled (sym, follow_past_lisp_magic)))) | |
| 2942 value = XSYMBOL_VALUE_LISP_MAGIC (value)->shadowed; | |
| 2943 return value; | |
| 2944 } | |
| 2945 | |
| 2946 static Lisp_Object * | |
| 2947 value_slot_past_magic (Lisp_Object sym) | |
| 2948 { | |
| 2949 Lisp_Object *store_pointer = &XSYMBOL (sym)->value; | |
| 2950 | |
| 2951 if (SYMBOL_VALUE_LISP_MAGIC_P (*store_pointer)) | |
| 2952 store_pointer = &XSYMBOL_VALUE_LISP_MAGIC (sym)->shadowed; | |
| 2953 return store_pointer; | |
| 2954 } | |
| 2955 | |
| 2956 static Lisp_Object | |
| 2957 maybe_call_magic_handler (Lisp_Object sym, Lisp_Object funsym, int nargs, ...) | |
| 2958 { | |
| 2959 va_list vargs; | |
| 2960 Lisp_Object args[20]; /* should be enough ... */ | |
| 2961 int i; | |
| 2962 enum lisp_magic_handler htype; | |
| 2963 Lisp_Object legerdemain; | |
| 2964 struct symbol_value_lisp_magic *bfwd; | |
| 2965 | |
| 440 | 2966 assert (nargs >= 0 && nargs < countof (args)); |
| 428 | 2967 legerdemain = XSYMBOL (sym)->value; |
| 2968 assert (SYMBOL_VALUE_LISP_MAGIC_P (legerdemain)); | |
| 2969 bfwd = XSYMBOL_VALUE_LISP_MAGIC (legerdemain); | |
| 2970 | |
| 2971 va_start (vargs, nargs); | |
| 2972 for (i = 0; i < nargs; i++) | |
| 2973 args[i] = va_arg (vargs, Lisp_Object); | |
| 2974 va_end (vargs); | |
| 2975 | |
| 2976 htype = handler_type_from_function_symbol (funsym, 1); | |
| 2977 if (NILP (bfwd->handler[htype])) | |
| 2978 return Qunbound; | |
| 2979 /* #### should be reusing the arglist, not always consing anew. | |
| 2980 Repeated handler invocations should not cause repeated consing. | |
| 2981 Doesn't matter for now, because this is just a quick implementation | |
| 2982 for obsolescence support. */ | |
| 2983 return call5 (bfwd->handler[htype], sym, Flist (nargs, args), funsym, | |
| 2984 bfwd->harg[htype], Qnil); | |
| 2985 } | |
| 2986 | |
| 2987 DEFUN ("dontusethis-set-symbol-value-handler", Fdontusethis_set_symbol_value_handler, | |
| 2988 3, 5, 0, /* | |
| 2989 Don't you dare use this. | |
| 2990 If you do, suffer the wrath of Ben, who is likely to rename | |
| 2991 this function (or change the semantics of its arguments) without | |
| 2992 pity, thereby invalidating your code. | |
| 2993 */ | |
| 2286 | 2994 (variable, handler_type, handler, harg, |
| 2995 UNUSED (keep_existing))) | |
| 428 | 2996 { |
| 2997 Lisp_Object valcontents; | |
| 2998 struct symbol_value_lisp_magic *bfwd; | |
| 2999 enum lisp_magic_handler htype; | |
| 3000 int i; | |
| 3001 | |
| 3002 /* #### WARNING, only some handler types are implemented. See above. | |
| 3003 Actions of other types will ignore a handler if it's there. | |
| 3004 | |
| 3005 #### Also, `chain-to-symbol-value-handler' and | |
| 3006 `symbol-function-corresponding-function' are not implemented. */ | |
| 3007 CHECK_SYMBOL (variable); | |
| 3008 CHECK_SYMBOL (handler_type); | |
| 3009 htype = decode_magic_handler_type (handler_type); | |
| 3010 valcontents = XSYMBOL (variable)->value; | |
| 3011 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents)) | |
| 3012 { | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3013 bfwd = |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3014 XSYMBOL_VALUE_LISP_MAGIC |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3015 (ALLOC_LISP_OBJECT (symbol_value_lisp_magic)); |
| 428 | 3016 bfwd->magic.type = SYMVAL_LISP_MAGIC; |
| 3017 for (i = 0; i < MAGIC_HANDLER_MAX; i++) | |
| 3018 { | |
| 3019 bfwd->handler[i] = Qnil; | |
| 3020 bfwd->harg[i] = Qnil; | |
| 3021 } | |
| 3022 bfwd->shadowed = valcontents; | |
| 793 | 3023 XSYMBOL (variable)->value = wrap_symbol_value_magic (bfwd); |
| 428 | 3024 } |
| 3025 else | |
| 3026 bfwd = XSYMBOL_VALUE_LISP_MAGIC (valcontents); | |
| 3027 bfwd->handler[htype] = handler; | |
| 3028 bfwd->harg[htype] = harg; | |
| 3029 | |
| 3030 for (i = 0; i < MAGIC_HANDLER_MAX; i++) | |
| 3031 if (!NILP (bfwd->handler[i])) | |
| 3032 break; | |
| 3033 | |
| 3034 if (i == MAGIC_HANDLER_MAX) | |
| 3035 /* there are no remaining handlers, so remove the structure. */ | |
| 3036 XSYMBOL (variable)->value = bfwd->shadowed; | |
| 3037 | |
| 3038 return Qnil; | |
| 3039 } | |
| 3040 | |
| 3041 | |
| 3042 /* functions for working with variable aliases. */ | |
| 3043 | |
| 3044 /* Follow the chain of variable aliases for SYMBOL. Return the | |
| 3045 resulting symbol, whose value cell is guaranteed not to be a | |
| 3046 symbol-value-varalias. | |
| 3047 | |
| 3048 Also maybe follow past symbol-value-lisp-magic -> symbol-value-varalias. | |
| 3049 If FUNSYM is t, always follow in such a case. If FUNSYM is nil, | |
| 3050 never follow; stop right there. Otherwise FUNSYM should be a | |
| 3051 recognized symbol-value function symbol; this means, follow | |
| 3052 unless there is a special handler for the named function. | |
| 3053 | |
| 3054 OK, there is at least one reason why it's necessary for | |
| 3055 FOLLOW-PAST-LISP-MAGIC to be specified correctly: So that we | |
| 3056 can always be sure to catch cyclic variable aliasing. If we never | |
| 3057 follow past Lisp magic, then if the following is done: | |
| 3058 | |
| 3059 (defvaralias 'a 'b) | |
| 3060 add some magic behavior to a, but not a "get-value" handler | |
| 3061 (defvaralias 'b 'a) | |
| 3062 | |
| 3063 then an attempt to retrieve a's or b's value would cause infinite | |
| 3064 looping in `symbol-value'. | |
| 3065 | |
| 3066 We (of course) can't always follow past Lisp magic, because then | |
| 3067 we make any variable that is lisp-magic -> varalias behave as if | |
| 3068 the lisp-magic is not present at all. | |
| 3069 */ | |
| 3070 | |
| 3071 static Lisp_Object | |
| 3072 follow_varalias_pointers (Lisp_Object symbol, | |
| 3073 Lisp_Object follow_past_lisp_magic) | |
| 3074 { | |
| 3075 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16 | |
| 3076 Lisp_Object tortoise, hare, val; | |
| 3077 int count; | |
| 3078 | |
| 3079 /* quick out just in case */ | |
| 3080 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value)) | |
| 3081 return symbol; | |
| 3082 | |
| 3083 /* Compare implementation of indirect_function(). */ | |
| 3084 for (hare = tortoise = symbol, count = 0; | |
| 3085 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic), | |
| 3086 SYMBOL_VALUE_VARALIAS_P (val); | |
| 3087 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)), | |
| 3088 count++) | |
| 3089 { | |
| 3090 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue; | |
| 3091 | |
| 3092 if (count & 1) | |
| 3093 tortoise = symbol_value_varalias_aliasee | |
| 3094 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic | |
| 3095 (tortoise, follow_past_lisp_magic))); | |
| 3096 if (EQ (hare, tortoise)) | |
| 3097 return Fsignal (Qcyclic_variable_indirection, list1 (symbol)); | |
| 3098 } | |
| 3099 | |
| 3100 return hare; | |
| 3101 } | |
| 3102 | |
| 3103 DEFUN ("defvaralias", Fdefvaralias, 2, 2, 0, /* | |
| 3104 Define a variable as an alias for another variable. | |
| 3105 Thenceforth, any operations performed on VARIABLE will actually be | |
| 3106 performed on ALIAS. Both VARIABLE and ALIAS should be symbols. | |
| 3107 If ALIAS is nil, remove any aliases for VARIABLE. | |
| 3108 ALIAS can itself be aliased, and the chain of variable aliases | |
| 3109 will be followed appropriately. | |
| 3110 If VARIABLE already has a value, this value will be shadowed | |
| 3111 until the alias is removed, at which point it will be restored. | |
| 3112 Currently VARIABLE cannot be a built-in variable, a variable that | |
| 3113 has a buffer-local value in any buffer, or the symbols nil or t. | |
| 3114 \(ALIAS, however, can be any type of variable.) | |
| 3115 */ | |
| 3116 (variable, alias)) | |
| 3117 { | |
| 3118 struct symbol_value_varalias *bfwd; | |
| 3119 Lisp_Object valcontents; | |
| 3120 | |
| 3121 CHECK_SYMBOL (variable); | |
| 3122 reject_constant_symbols (variable, Qunbound, 0, Qt); | |
| 3123 | |
| 3124 valcontents = XSYMBOL (variable)->value; | |
| 3125 | |
| 3126 if (NILP (alias)) | |
| 3127 { | |
| 3128 if (SYMBOL_VALUE_VARALIAS_P (valcontents)) | |
| 3129 { | |
| 3130 XSYMBOL (variable)->value = | |
| 3131 symbol_value_varalias_shadowed | |
| 3132 (XSYMBOL_VALUE_VARALIAS (valcontents)); | |
| 3133 } | |
| 3134 return Qnil; | |
| 3135 } | |
| 3136 | |
| 3137 CHECK_SYMBOL (alias); | |
| 3138 if (SYMBOL_VALUE_VARALIAS_P (valcontents)) | |
| 3139 { | |
| 3140 /* transmogrify */ | |
| 3141 XSYMBOL_VALUE_VARALIAS (valcontents)->aliasee = alias; | |
| 3142 return Qnil; | |
| 3143 } | |
| 3144 | |
| 3145 if (SYMBOL_VALUE_MAGIC_P (valcontents) | |
| 3146 && !UNBOUNDP (valcontents)) | |
| 563 | 3147 invalid_change ("Variable is magic and cannot be aliased", variable); |
| 428 | 3148 reject_constant_symbols (variable, Qunbound, 0, Qt); |
| 3149 | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3150 bfwd = |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3151 XSYMBOL_VALUE_VARALIAS (ALLOC_LISP_OBJECT (symbol_value_varalias)); |
| 428 | 3152 bfwd->magic.type = SYMVAL_VARALIAS; |
| 3153 bfwd->aliasee = alias; | |
| 3154 bfwd->shadowed = valcontents; | |
| 3155 | |
| 793 | 3156 valcontents = wrap_symbol_value_magic (bfwd); |
| 428 | 3157 XSYMBOL (variable)->value = valcontents; |
| 3158 return Qnil; | |
| 3159 } | |
| 3160 | |
| 3161 DEFUN ("variable-alias", Fvariable_alias, 1, 2, 0, /* | |
| 3162 If VARIABLE is aliased to another variable, return that variable. | |
| 3163 VARIABLE should be a symbol. If VARIABLE is not aliased, return nil. | |
| 3164 Variable aliases are created with `defvaralias'. See also | |
| 3165 `indirect-variable'. | |
| 3166 */ | |
| 3167 (variable, follow_past_lisp_magic)) | |
| 3168 { | |
| 3169 Lisp_Object valcontents; | |
| 3170 | |
| 3171 CHECK_SYMBOL (variable); | |
| 3172 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt)) | |
| 3173 { | |
| 3174 CHECK_SYMBOL (follow_past_lisp_magic); | |
| 3175 handler_type_from_function_symbol (follow_past_lisp_magic, 0); | |
| 3176 } | |
| 3177 | |
| 3178 valcontents = fetch_value_maybe_past_magic (variable, | |
| 3179 follow_past_lisp_magic); | |
| 3180 | |
| 3181 if (SYMBOL_VALUE_VARALIAS_P (valcontents)) | |
| 3182 return symbol_value_varalias_aliasee | |
| 3183 (XSYMBOL_VALUE_VARALIAS (valcontents)); | |
| 3184 else | |
| 3185 return Qnil; | |
| 3186 } | |
| 3187 | |
| 3188 DEFUN ("indirect-variable", Findirect_variable, 1, 2, 0, /* | |
| 3189 Return the variable at the end of OBJECT's variable-alias chain. | |
| 3190 If OBJECT is a symbol, follow all variable aliases and return | |
| 3191 the final (non-aliased) symbol. Variable aliases are created with | |
| 3192 the function `defvaralias'. | |
| 3193 If OBJECT is not a symbol, just return it. | |
| 3194 Signal a cyclic-variable-indirection error if there is a loop in the | |
| 3195 variable chain of symbols. | |
| 3196 */ | |
| 3197 (object, follow_past_lisp_magic)) | |
| 3198 { | |
| 3199 if (!SYMBOLP (object)) | |
| 3200 return object; | |
| 3201 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt)) | |
| 3202 { | |
| 3203 CHECK_SYMBOL (follow_past_lisp_magic); | |
| 3204 handler_type_from_function_symbol (follow_past_lisp_magic, 0); | |
| 3205 } | |
| 3206 return follow_varalias_pointers (object, follow_past_lisp_magic); | |
| 3207 } | |
| 3208 | |
| 1674 | 3209 DEFUN ("variable-binding-locus", Fvariable_binding_locus, 1, 1, 0, /* |
| 3210 Return a value indicating where VARIABLE's current binding comes from. | |
| 3211 If the current binding is buffer-local, the value is the current buffer. | |
| 3212 If the current binding is global (the default), the value is nil. | |
| 3213 */ | |
| 3214 (variable)) | |
| 3215 { | |
| 3216 Lisp_Object valcontents; | |
| 3217 | |
| 3218 CHECK_SYMBOL (variable); | |
| 3219 variable = Findirect_variable (variable, Qnil); | |
| 3220 | |
| 3221 /* Make sure the current binding is actually swapped in. */ | |
| 3222 find_symbol_value (variable); | |
| 3223 | |
| 3224 valcontents = XSYMBOL (variable)->value; | |
| 3225 | |
| 3226 if (SYMBOL_VALUE_MAGIC_P (valcontents) | |
| 3227 && ((XSYMBOL_VALUE_MAGIC_TYPE (valcontents) == SYMVAL_BUFFER_LOCAL) | |
| 3228 || (XSYMBOL_VALUE_MAGIC_TYPE (valcontents) == SYMVAL_SOME_BUFFER_LOCAL)) | |
| 3229 && (!NILP (Flocal_variable_p (variable, Fcurrent_buffer (), Qnil)))) | |
| 3230 return Fcurrent_buffer (); | |
| 3231 else | |
| 3232 return Qnil; | |
| 3233 } | |
| 428 | 3234 |
| 3235 /************************************************************************/ | |
| 3236 /* initialization */ | |
| 3237 /************************************************************************/ | |
| 3238 | |
| 3239 /* A dumped XEmacs image has a lot more than 1511 symbols. Last | |
| 3240 estimate was that there were actually around 6300. So let's try | |
| 3241 making this bigger and see if we get better hashing behavior. */ | |
| 3242 #define OBARRAY_SIZE 16411 | |
| 3243 | |
| 3244 #ifndef Qzero | |
| 3245 Lisp_Object Qzero; | |
| 3246 #endif | |
| 3247 #ifndef Qnull_pointer | |
| 3248 Lisp_Object Qnull_pointer; | |
| 3249 #endif | |
| 3250 | |
| 2720 | 3251 #ifndef MC_ALLOC |
| 428 | 3252 /* some losing systems can't have static vars at function scope... */ |
| 442 | 3253 static const struct symbol_value_magic guts_of_unbound_marker = |
| 3254 { /* struct symbol_value_magic */ | |
| 3024 | 3255 { /* struct old_lcrecord_header */ |
| 442 | 3256 { /* struct lrecord_header */ |
| 3257 lrecord_type_symbol_value_forward, /* lrecord_type_index */ | |
| 3258 1, /* mark bit */ | |
| 3259 1, /* c_readonly bit */ | |
| 3260 1, /* lisp_readonly bit */ | |
| 3261 }, | |
| 3262 0, /* next */ | |
| 3263 0, /* uid */ | |
| 3264 0, /* free */ | |
| 3265 }, | |
| 3266 0, /* value */ | |
| 3267 SYMVAL_UNBOUND_MARKER | |
| 3268 }; | |
| 2720 | 3269 #endif /* not MC_ALLOC */ |
| 428 | 3270 |
| 3271 void | |
| 3272 init_symbols_once_early (void) | |
| 3273 { | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3274 INIT_LISP_OBJECT (symbol); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3275 INIT_LISP_OBJECT (symbol_value_forward); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3276 INIT_LISP_OBJECT (symbol_value_buffer_local); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3277 INIT_LISP_OBJECT (symbol_value_lisp_magic); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3278 INIT_LISP_OBJECT (symbol_value_varalias); |
| 442 | 3279 |
| 1204 | 3280 reinit_symbols_early (); |
| 428 | 3281 |
| 3282 /* Bootstrapping problem: Qnil isn't set when make_string_nocopy is | |
| 3283 called the first time. */ | |
| 867 | 3284 Qnil = Fmake_symbol (make_string_nocopy ((const Ibyte *) "nil", 3)); |
| 793 | 3285 XSTRING_PLIST (XSYMBOL (Qnil)->name) = Qnil; |
| 428 | 3286 XSYMBOL (Qnil)->value = Qnil; /* Nihil ex nihil */ |
| 3287 XSYMBOL (Qnil)->plist = Qnil; | |
| 3288 | |
| 3289 Vobarray = make_vector (OBARRAY_SIZE, Qzero); | |
| 3290 initial_obarray = Vobarray; | |
| 3291 staticpro (&initial_obarray); | |
| 3292 /* Intern nil in the obarray */ | |
| 3293 { | |
| 793 | 3294 unsigned int hash = hash_string (XSTRING_DATA (XSYMBOL (Qnil)->name), 3); |
| 428 | 3295 XVECTOR_DATA (Vobarray)[hash % OBARRAY_SIZE] = Qnil; |
| 3296 } | |
| 3297 | |
| 3298 { | |
| 3299 /* Required to get around a GCC syntax error on certain | |
| 3300 architectures */ | |
| 2720 | 3301 #ifdef MC_ALLOC |
| 3302 struct symbol_value_magic *tem = (struct symbol_value_magic *) | |
| 3303 mc_alloc (sizeof (struct symbol_value_magic)); | |
| 3304 MARK_LRECORD_AS_LISP_READONLY (tem); | |
| 3305 MARK_LRECORD_AS_NOT_FREE (tem); | |
| 3306 tem->header.type = lrecord_type_symbol_value_forward; | |
| 3307 mcpro (wrap_pointer_1 (tem)); | |
| 3308 tem->value = 0; | |
| 3309 tem->type = SYMVAL_UNBOUND_MARKER; | |
| 2994 | 3310 #ifdef ALLOC_TYPE_STATS |
| 2775 | 3311 inc_lrecord_stats (sizeof (struct symbol_value_magic), |
| 3312 (const struct lrecord_header *) tem); | |
| 2994 | 3313 #endif /* ALLOC_TYPE_STATS */ |
| 2720 | 3314 #else /* not MC_ALLOC */ |
| 442 | 3315 const struct symbol_value_magic *tem = &guts_of_unbound_marker; |
| 2720 | 3316 #endif /* not MC_ALLOC */ |
| 428 | 3317 |
| 793 | 3318 Qunbound = wrap_symbol_value_magic (tem); |
| 428 | 3319 } |
| 3320 | |
| 3321 XSYMBOL (Qnil)->function = Qunbound; | |
| 3322 | |
| 563 | 3323 DEFSYMBOL (Qt); |
| 444 | 3324 XSYMBOL (Qt)->value = Qt; /* Veritas aeterna */ |
| 428 | 3325 Vquit_flag = Qnil; |
| 3326 | |
| 1204 | 3327 dump_add_root_lisp_object (&Qnil); |
| 3328 dump_add_root_lisp_object (&Qunbound); | |
| 3329 dump_add_root_lisp_object (&Vquit_flag); | |
| 428 | 3330 } |
| 3331 | |
| 3332 void | |
| 1204 | 3333 reinit_symbols_early (void) |
| 440 | 3334 { |
| 3335 } | |
| 3336 | |
| 442 | 3337 static void |
| 3338 defsymbol_massage_name_1 (Lisp_Object *location, const char *name, int dump_p, | |
| 3339 int multiword_predicate_p) | |
| 3340 { | |
| 3341 char temp[500]; | |
| 3342 int len = strlen (name) - 1; | |
| 3343 int i; | |
| 3344 | |
| 3345 if (multiword_predicate_p) | |
| 647 | 3346 assert (len + 1 < (int) sizeof (temp)); |
| 442 | 3347 else |
| 647 | 3348 assert (len < (int) sizeof (temp)); |
| 442 | 3349 strcpy (temp, name + 1); /* Remove initial Q */ |
| 3350 if (multiword_predicate_p) | |
| 3351 { | |
| 3352 strcpy (temp + len - 1, "_p"); | |
| 3353 len++; | |
| 3354 } | |
| 3355 for (i = 0; i < len; i++) | |
| 3356 if (temp[i] == '_') | |
| 3357 temp[i] = '-'; | |
| 867 | 3358 *location = Fintern (make_string ((const Ibyte *) temp, len), Qnil); |
| 442 | 3359 if (dump_p) |
| 3360 staticpro (location); | |
| 3361 else | |
| 3362 staticpro_nodump (location); | |
| 3363 } | |
| 3364 | |
| 440 | 3365 void |
| 442 | 3366 defsymbol_massage_name_nodump (Lisp_Object *location, const char *name) |
| 3367 { | |
| 3368 defsymbol_massage_name_1 (location, name, 0, 0); | |
| 3369 } | |
| 3370 | |
| 3371 void | |
| 3372 defsymbol_massage_name (Lisp_Object *location, const char *name) | |
| 428 | 3373 { |
| 442 | 3374 defsymbol_massage_name_1 (location, name, 1, 0); |
| 3375 } | |
| 3376 | |
| 3377 void | |
| 3378 defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location, | |
| 3379 const char *name) | |
| 3380 { | |
| 3381 defsymbol_massage_name_1 (location, name, 0, 1); | |
| 3382 } | |
| 3383 | |
| 3384 void | |
| 3385 defsymbol_massage_multiword_predicate (Lisp_Object *location, const char *name) | |
| 3386 { | |
| 3387 defsymbol_massage_name_1 (location, name, 1, 1); | |
| 3388 } | |
| 3389 | |
| 3390 void | |
| 3391 defsymbol_nodump (Lisp_Object *location, const char *name) | |
| 3392 { | |
| 867 | 3393 *location = Fintern (make_string_nocopy ((const Ibyte *) name, |
| 428 | 3394 strlen (name)), |
| 3395 Qnil); | |
| 3396 staticpro_nodump (location); | |
| 3397 } | |
| 3398 | |
| 3399 void | |
| 442 | 3400 defsymbol (Lisp_Object *location, const char *name) |
| 428 | 3401 { |
| 867 | 3402 *location = Fintern (make_string_nocopy ((const Ibyte *) name, |
| 428 | 3403 strlen (name)), |
| 3404 Qnil); | |
| 3405 staticpro (location); | |
| 3406 } | |
| 3407 | |
| 3408 void | |
| 442 | 3409 defkeyword (Lisp_Object *location, const char *name) |
| 428 | 3410 { |
| 3411 defsymbol (location, name); | |
| 3412 Fset (*location, *location); | |
| 3413 } | |
| 3414 | |
| 442 | 3415 void |
| 3416 defkeyword_massage_name (Lisp_Object *location, const char *name) | |
| 3417 { | |
| 3418 char temp[500]; | |
| 3419 int len = strlen (name); | |
| 3420 | |
| 647 | 3421 assert (len < (int) sizeof (temp)); |
| 442 | 3422 strcpy (temp, name); |
| 3423 temp[1] = ':'; /* it's an underscore in the C variable */ | |
| 3424 | |
| 3425 defsymbol_massage_name (location, temp); | |
| 3426 Fset (*location, *location); | |
| 3427 } | |
| 3428 | |
| 428 | 3429 #ifdef DEBUG_XEMACS |
| 930 | 3430 /* Check that nobody spazzed writing a builtin (non-module) DEFUN. */ |
| 428 | 3431 static void |
| 3432 check_sane_subr (Lisp_Subr *subr, Lisp_Object sym) | |
| 3433 { | |
| 930 | 3434 if (!initialized) { |
| 3435 assert (subr->min_args >= 0); | |
| 3436 assert (subr->min_args <= SUBR_MAX_ARGS); | |
| 3437 | |
| 3438 if (subr->max_args != MANY && | |
| 3439 subr->max_args != UNEVALLED) | |
| 3440 { | |
| 3441 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ | |
| 3442 assert (subr->max_args <= SUBR_MAX_ARGS); | |
| 3443 assert (subr->min_args <= subr->max_args); | |
| 3444 } | |
| 3445 assert (UNBOUNDP (XSYMBOL (sym)->function)); | |
| 3446 } | |
| 428 | 3447 } |
| 3448 #else | |
| 3449 #define check_sane_subr(subr, sym) /* nothing */ | |
| 3450 #endif | |
| 3451 | |
| 3452 #ifdef HAVE_SHLIB | |
| 2963 | 3453 #ifndef MC_ALLOC |
| 428 | 3454 /* |
| 3455 * If we are not in a pure undumped Emacs, we need to make a duplicate of | |
| 3456 * the subr. This is because the only time this function will be called | |
| 3457 * in a running Emacs is when a dynamically loaded module is adding a | |
| 3458 * subr, and we need to make sure that the subr is in allocated, Lisp- | |
| 3459 * accessible memory. The address assigned to the static subr struct | |
| 3460 * in the shared object will be a trampoline address, so we need to create | |
| 3461 * a copy here to ensure that a real address is used. | |
| 3462 * | |
| 3463 * Once we have copied everything across, we re-use the original static | |
| 3464 * structure to store a pointer to the newly allocated one. This will be | |
| 3465 * used in emodules.c by emodules_doc_subr() to find a pointer to the | |
| 442 | 3466 * allocated object so that we can set its doc string properly. |
| 428 | 3467 * |
| 442 | 3468 * NOTE: We don't actually use the DOC pointer here any more, but we did |
| 428 | 3469 * in an earlier implementation of module support. There is no harm in |
| 3470 * setting it here in case we ever need it in future implementations. | |
| 3471 * subr->doc will point to the new subr structure that was allocated. | |
| 442 | 3472 * Code can then get this value from the static subr structure and use |
| 428 | 3473 * it if required. |
| 3474 * | |
| 442 | 3475 * FIXME: Should newsubr be staticpro()'ed? I don't think so but I need |
| 428 | 3476 * a guru to check. |
| 3477 */ | |
| 930 | 3478 #define check_module_subr(subr) \ |
| 3479 do { \ | |
| 3480 if (initialized) { \ | |
| 3481 Lisp_Subr *newsubr; \ | |
| 3482 Lisp_Object f; \ | |
| 3483 \ | |
| 3484 if (subr->min_args < 0) \ | |
| 3485 signal_ferror (Qdll_error, "%s min_args (%hd) too small", \ | |
| 3486 subr_name (subr), subr->min_args); \ | |
| 3487 if (subr->min_args > SUBR_MAX_ARGS) \ | |
| 3488 signal_ferror (Qdll_error, "%s min_args (%hd) too big (max = %d)", \ | |
| 3489 subr_name (subr), subr->min_args, SUBR_MAX_ARGS); \ | |
| 3490 \ | |
| 3491 if (subr->max_args != MANY && \ | |
| 3492 subr->max_args != UNEVALLED) \ | |
| 3493 { \ | |
| 3494 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ \ | |
| 3495 if (subr->max_args > SUBR_MAX_ARGS) \ | |
| 3496 signal_ferror (Qdll_error, "%s max_args (%hd) too big (max = %d)", \ | |
| 3497 subr_name (subr), subr->max_args, SUBR_MAX_ARGS); \ | |
| 3498 if (subr->min_args > subr->max_args) \ | |
| 3499 signal_ferror (Qdll_error, "%s min_args (%hd) > max_args (%hd)", \ | |
| 3500 subr_name (subr), subr->min_args, subr->max_args); \ | |
| 3501 } \ | |
| 3502 \ | |
| 3503 f = XSYMBOL (sym)->function; \ | |
| 3504 if (!UNBOUNDP (f) && (!CONSP (f) || !EQ (XCAR (f), Qautoload))) \ | |
| 3505 signal_ferror (Qdll_error, "Attempt to redefine %s", subr_name (subr)); \ | |
| 3506 \ | |
| 2367 | 3507 newsubr = xnew (Lisp_Subr); \ |
| 930 | 3508 memcpy (newsubr, subr, sizeof (Lisp_Subr)); \ |
| 3509 subr->doc = (const char *)newsubr; \ | |
| 3510 subr = newsubr; \ | |
| 3511 } \ | |
| 428 | 3512 } while (0) |
| 2963 | 3513 #else /* MC_ALLOC */ |
| 3514 /* | |
| 3515 * If we have the new allocator enabled, we do not need to make a | |
| 3516 * duplicate of the subr. The new allocator already does allocate all | |
| 3517 * subrs in Lisp-accessible memory rather than have it in the static | |
| 3518 * subr struct. | |
| 3519 * | |
| 3520 * NOTE: The DOC pointer is not set here as described above. | |
| 3521 */ | |
| 3522 #define check_module_subr(subr) \ | |
| 3523 do { \ | |
| 3524 if (initialized) { \ | |
| 3525 Lisp_Object f; \ | |
| 3526 \ | |
| 3527 if (subr->min_args < 0) \ | |
| 3528 signal_ferror (Qdll_error, "%s min_args (%hd) too small", \ | |
| 3529 subr_name (subr), subr->min_args); \ | |
| 3530 if (subr->min_args > SUBR_MAX_ARGS) \ | |
| 3531 signal_ferror (Qdll_error, "%s min_args (%hd) too big (max = %d)", \ | |
| 3532 subr_name (subr), subr->min_args, SUBR_MAX_ARGS); \ | |
| 3533 \ | |
| 3534 if (subr->max_args != MANY && \ | |
| 3535 subr->max_args != UNEVALLED) \ | |
| 3536 { \ | |
| 3537 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ \ | |
| 3538 if (subr->max_args > SUBR_MAX_ARGS) \ | |
| 3539 signal_ferror (Qdll_error, "%s max_args (%hd) too big (max = %d)", \ | |
| 3540 subr_name (subr), subr->max_args, SUBR_MAX_ARGS); \ | |
| 3541 if (subr->min_args > subr->max_args) \ | |
| 3542 signal_ferror (Qdll_error, "%s min_args (%hd) > max_args (%hd)", \ | |
| 3543 subr_name (subr), subr->min_args, subr->max_args); \ | |
| 3544 } \ | |
| 3545 \ | |
| 3546 f = XSYMBOL (sym)->function; \ | |
| 3547 if (!UNBOUNDP (f) && (!CONSP (f) || !EQ (XCAR (f), Qautoload))) \ | |
| 3548 signal_ferror (Qdll_error, "Attempt to redefine %s", subr_name (subr)); \ | |
| 3549 } \ | |
| 3550 } while (0) | |
| 3551 #endif /* MC_ALLOC */ | |
| 428 | 3552 #else /* ! HAVE_SHLIB */ |
| 930 | 3553 #define check_module_subr(subr) |
| 428 | 3554 #endif |
| 3555 | |
| 3556 void | |
| 3557 defsubr (Lisp_Subr *subr) | |
| 3558 { | |
| 3559 Lisp_Object sym = intern (subr_name (subr)); | |
| 3560 Lisp_Object fun; | |
| 3561 | |
| 3562 check_sane_subr (subr, sym); | |
| 930 | 3563 check_module_subr (subr); |
| 428 | 3564 |
| 793 | 3565 fun = wrap_subr (subr); |
| 428 | 3566 XSYMBOL (sym)->function = fun; |
| 996 | 3567 |
| 3568 #ifdef HAVE_SHLIB | |
| 3569 /* If it is declared in a module, update the load history */ | |
| 3570 if (initialized) | |
| 3571 LOADHIST_ATTACH (sym); | |
| 3572 #endif | |
| 428 | 3573 } |
| 3574 | |
| 3575 /* Define a lisp macro using a Lisp_Subr. */ | |
| 3576 void | |
| 3577 defsubr_macro (Lisp_Subr *subr) | |
| 3578 { | |
| 3579 Lisp_Object sym = intern (subr_name (subr)); | |
| 3580 Lisp_Object fun; | |
| 3581 | |
| 3582 check_sane_subr (subr, sym); | |
| 930 | 3583 check_module_subr (subr); |
| 428 | 3584 |
| 793 | 3585 fun = wrap_subr (subr); |
| 428 | 3586 XSYMBOL (sym)->function = Fcons (Qmacro, fun); |
| 996 | 3587 |
| 3588 #ifdef HAVE_SHLIB | |
| 3589 /* If it is declared in a module, update the load history */ | |
| 3590 if (initialized) | |
| 3591 LOADHIST_ATTACH (sym); | |
| 3592 #endif | |
| 428 | 3593 } |
| 3594 | |
| 442 | 3595 static void |
| 3596 deferror_1 (Lisp_Object *symbol, const char *name, const char *messuhhj, | |
| 3597 Lisp_Object inherits_from, int massage_p) | |
| 428 | 3598 { |
| 3599 Lisp_Object conds; | |
| 442 | 3600 if (massage_p) |
| 3601 defsymbol_massage_name (symbol, name); | |
| 3602 else | |
| 3603 defsymbol (symbol, name); | |
| 428 | 3604 |
| 3605 assert (SYMBOLP (inherits_from)); | |
| 3606 conds = Fget (inherits_from, Qerror_conditions, Qnil); | |
| 3607 Fput (*symbol, Qerror_conditions, Fcons (*symbol, conds)); | |
| 771 | 3608 /* NOT build_msg_string (). This function is called at load time |
| 428 | 3609 and the string needs to get translated at run time. (This happens |
| 3610 in the function (display-error) in cmdloop.el.) */ | |
| 771 | 3611 Fput (*symbol, Qerror_message, build_msg_string (messuhhj)); |
| 428 | 3612 } |
| 3613 | |
| 3614 void | |
| 442 | 3615 deferror (Lisp_Object *symbol, const char *name, const char *messuhhj, |
| 3616 Lisp_Object inherits_from) | |
| 3617 { | |
| 3618 deferror_1 (symbol, name, messuhhj, inherits_from, 0); | |
| 3619 } | |
| 3620 | |
| 3621 void | |
| 3622 deferror_massage_name (Lisp_Object *symbol, const char *name, | |
| 3623 const char *messuhhj, Lisp_Object inherits_from) | |
| 3624 { | |
| 3625 deferror_1 (symbol, name, messuhhj, inherits_from, 1); | |
| 3626 } | |
| 3627 | |
| 3628 void | |
| 3629 deferror_massage_name_and_message (Lisp_Object *symbol, const char *name, | |
| 3630 Lisp_Object inherits_from) | |
| 3631 { | |
| 3632 char temp[500]; | |
| 3633 int i; | |
| 3634 int len = strlen (name) - 1; | |
| 3635 | |
| 647 | 3636 assert (len < (int) sizeof (temp)); |
| 442 | 3637 strcpy (temp, name + 1); /* Remove initial Q */ |
| 3638 temp[0] = toupper (temp[0]); | |
| 3639 for (i = 0; i < len; i++) | |
| 3640 if (temp[i] == '_') | |
| 3641 temp[i] = ' '; | |
| 3642 | |
| 3643 deferror_1 (symbol, name, temp, inherits_from, 1); | |
| 3644 } | |
| 3645 | |
| 3646 void | |
| 428 | 3647 syms_of_symbols (void) |
| 3648 { | |
| 442 | 3649 DEFSYMBOL (Qvariable_documentation); |
| 3650 DEFSYMBOL (Qvariable_domain); /* I18N3 */ | |
| 3651 DEFSYMBOL (Qad_advice_info); | |
| 3652 DEFSYMBOL (Qad_activate); | |
| 3653 | |
| 3654 DEFSYMBOL (Qget_value); | |
| 3655 DEFSYMBOL (Qset_value); | |
| 3656 DEFSYMBOL (Qbound_predicate); | |
| 3657 DEFSYMBOL (Qmake_unbound); | |
| 3658 DEFSYMBOL (Qlocal_predicate); | |
| 3659 DEFSYMBOL (Qmake_local); | |
| 3660 | |
| 3661 DEFSYMBOL (Qboundp); | |
| 3662 DEFSYMBOL (Qglobally_boundp); | |
| 3663 DEFSYMBOL (Qmakunbound); | |
| 3664 DEFSYMBOL (Qsymbol_value); | |
| 3665 DEFSYMBOL (Qset); | |
| 3666 DEFSYMBOL (Qsetq_default); | |
| 3667 DEFSYMBOL (Qdefault_boundp); | |
| 3668 DEFSYMBOL (Qdefault_value); | |
| 3669 DEFSYMBOL (Qset_default); | |
| 3670 DEFSYMBOL (Qmake_variable_buffer_local); | |
| 3671 DEFSYMBOL (Qmake_local_variable); | |
| 3672 DEFSYMBOL (Qkill_local_variable); | |
| 3673 DEFSYMBOL (Qkill_console_local_variable); | |
| 3674 DEFSYMBOL (Qsymbol_value_in_buffer); | |
| 3675 DEFSYMBOL (Qsymbol_value_in_console); | |
| 3676 DEFSYMBOL (Qlocal_variable_p); | |
| 3677 DEFSYMBOL (Qconst_integer); | |
| 3678 DEFSYMBOL (Qconst_boolean); | |
| 3679 DEFSYMBOL (Qconst_object); | |
| 3680 DEFSYMBOL (Qconst_specifier); | |
| 3681 DEFSYMBOL (Qdefault_buffer); | |
| 3682 DEFSYMBOL (Qcurrent_buffer); | |
| 3683 DEFSYMBOL (Qconst_current_buffer); | |
| 3684 DEFSYMBOL (Qdefault_console); | |
| 3685 DEFSYMBOL (Qselected_console); | |
| 3686 DEFSYMBOL (Qconst_selected_console); | |
| 428 | 3687 |
| 3688 DEFSUBR (Fintern); | |
| 3689 DEFSUBR (Fintern_soft); | |
| 3690 DEFSUBR (Funintern); | |
| 3691 DEFSUBR (Fmapatoms); | |
| 3692 DEFSUBR (Fapropos_internal); | |
| 3693 | |
| 3694 DEFSUBR (Fsymbol_function); | |
| 3695 DEFSUBR (Fsymbol_plist); | |
| 3696 DEFSUBR (Fsymbol_name); | |
| 3697 DEFSUBR (Fmakunbound); | |
| 3698 DEFSUBR (Ffmakunbound); | |
| 3699 DEFSUBR (Fboundp); | |
| 3700 DEFSUBR (Fglobally_boundp); | |
| 3701 DEFSUBR (Ffboundp); | |
| 3702 DEFSUBR (Ffset); | |
| 3703 DEFSUBR (Fdefine_function); | |
| 3704 Ffset (intern ("defalias"), intern ("define-function")); | |
| 3705 DEFSUBR (Fsetplist); | |
| 3706 DEFSUBR (Fsymbol_value_in_buffer); | |
| 3707 DEFSUBR (Fsymbol_value_in_console); | |
| 3708 DEFSUBR (Fbuilt_in_variable_type); | |
| 3709 DEFSUBR (Fsymbol_value); | |
| 3710 DEFSUBR (Fset); | |
| 3711 DEFSUBR (Fdefault_boundp); | |
| 3712 DEFSUBR (Fdefault_value); | |
| 3713 DEFSUBR (Fset_default); | |
| 3714 DEFSUBR (Fsetq_default); | |
| 3715 DEFSUBR (Fmake_variable_buffer_local); | |
| 3716 DEFSUBR (Fmake_local_variable); | |
| 3717 DEFSUBR (Fkill_local_variable); | |
| 3718 DEFSUBR (Fkill_console_local_variable); | |
| 3719 DEFSUBR (Flocal_variable_p); | |
| 3720 DEFSUBR (Fdefvaralias); | |
| 3721 DEFSUBR (Fvariable_alias); | |
| 3722 DEFSUBR (Findirect_variable); | |
| 1674 | 3723 DEFSUBR (Fvariable_binding_locus); |
| 428 | 3724 DEFSUBR (Fdontusethis_set_symbol_value_handler); |
| 3725 } | |
| 3726 | |
| 3727 /* Create and initialize a Lisp variable whose value is forwarded to C data */ | |
| 3728 void | |
| 442 | 3729 defvar_magic (const char *symbol_name, const struct symbol_value_forward *magic) |
| 428 | 3730 { |
| 442 | 3731 Lisp_Object sym; |
| 428 | 3732 |
| 996 | 3733 #ifdef HAVE_SHLIB |
| 428 | 3734 /* |
| 3735 * As with defsubr(), this will only be called in a dumped Emacs when | |
| 3736 * we are adding variables from a dynamically loaded module. That means | |
| 3737 * we can't use purespace. Take that into account. | |
| 3738 */ | |
| 3739 if (initialized) | |
| 996 | 3740 { |
| 3741 sym = Fintern (build_string (symbol_name), Qnil); | |
| 3742 LOADHIST_ATTACH (sym); | |
| 3743 } | |
| 428 | 3744 else |
| 3745 #endif | |
| 867 | 3746 sym = Fintern (make_string_nocopy ((const Ibyte *) symbol_name, |
| 428 | 3747 strlen (symbol_name)), Qnil); |
| 3748 | |
| 793 | 3749 XSYMBOL (sym)->value = wrap_pointer_1 (magic); |
| 428 | 3750 } |
| 3751 | |
| 3752 void | |
| 3753 vars_of_symbols (void) | |
| 3754 { | |
| 3755 DEFVAR_LISP ("obarray", &Vobarray /* | |
| 3756 Symbol table for use by `intern' and `read'. | |
| 3757 It is a vector whose length ought to be prime for best results. | |
| 3758 The vector's contents don't make sense if examined from Lisp programs; | |
| 3759 to find all the symbols in an obarray, use `mapatoms'. | |
| 3760 */ ); | |
| 3761 /* obarray has been initialized long before */ | |
| 3762 } |