Mercurial > hg > xemacs-beta
annotate src/symbols.c @ 5255:b5611afbcc76
Support process plists, for greater GNU compatibility.
src/ChangeLog addition:
2010-09-02 Aidan Kehoe <kehoea@parhasard.net>
* process.c (process_getprop, process_putprop, process_remprop)
(process_plist, process_setplist, reinit_process_early):
Add functions to modify a process's property list.
* process-slots.h (MARKED_SLOT): Add a plist slot.
* fns.c (Fobject_setplist): New function, analogous to #'setplist,
but more general.
Update the documentation in the other plist functions to reflect
that processes now have property lists.
* emacs.c (main_1): Call reinit_process_early(), now processes have
plist methods that need to be initialised.
* symbols.c (reinit_symbol_objects_early): Fsetplist is the named
setplist method for symbols.
lisp/ChangeLog addition:
2010-09-02 Aidan Kehoe <kehoea@parhasard.net>
* obsolete.el (process-get):
Make #'process-get, #'process-put, #'process-plist,
#'set-process-plist available as aliases to the more general
functions #'get, #'put, #'object-plist, #'object-setplist, for GNU
compatibility.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Thu, 02 Sep 2010 12:23:11 +0100 |
| parents | 18c0b5909d16 |
| children | d804e621add0 |
| 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. | |
|
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3 Copyright (C) 1995, 2000, 2001, 2002, 2010 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 | |
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57 #include "bytecode.h" /* for COMPILED_FUNCTION_ANNOTATION_HACK, |
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58 defined in bytecode.h and used here. */ |
| 428 | 59 #include "buffer.h" /* for Vbuffer_defaults */ |
| 872 | 60 #include "console-impl.h" |
| 428 | 61 #include "elhash.h" |
| 62 | |
| 63 Lisp_Object Qad_advice_info, Qad_activate; | |
| 64 | |
| 65 Lisp_Object Qget_value, Qset_value, Qbound_predicate, Qmake_unbound; | |
| 66 Lisp_Object Qlocal_predicate, Qmake_local; | |
| 67 | |
| 68 Lisp_Object Qboundp, Qglobally_boundp, Qmakunbound; | |
| 69 Lisp_Object Qsymbol_value, Qset, Qdefault_boundp, Qdefault_value; | |
| 70 Lisp_Object Qset_default, Qsetq_default; | |
| 71 Lisp_Object Qmake_variable_buffer_local, Qmake_local_variable; | |
| 72 Lisp_Object Qkill_local_variable, Qkill_console_local_variable; | |
| 73 Lisp_Object Qsymbol_value_in_buffer, Qsymbol_value_in_console; | |
| 74 Lisp_Object Qlocal_variable_p; | |
| 75 | |
| 76 Lisp_Object Qconst_integer, Qconst_boolean, Qconst_object; | |
| 77 Lisp_Object Qconst_specifier; | |
| 78 Lisp_Object Qdefault_buffer, Qcurrent_buffer, Qconst_current_buffer; | |
| 79 Lisp_Object Qdefault_console, Qselected_console, Qconst_selected_console; | |
| 80 | |
| 81 static Lisp_Object maybe_call_magic_handler (Lisp_Object sym, | |
| 82 Lisp_Object funsym, | |
| 83 int nargs, ...); | |
| 84 static Lisp_Object fetch_value_maybe_past_magic (Lisp_Object sym, | |
| 85 Lisp_Object follow_past_lisp_magic); | |
| 86 static Lisp_Object *value_slot_past_magic (Lisp_Object sym); | |
| 87 static Lisp_Object follow_varalias_pointers (Lisp_Object symbol, | |
| 88 Lisp_Object follow_past_lisp_magic); | |
|
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89 static Lisp_Object map_varalias_chain (Lisp_Object symbol, |
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90 Lisp_Object follow_past_lisp_magic, |
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91 Lisp_Object (*fn) (Lisp_Object arg)); |
| 428 | 92 |
| 93 | |
| 94 static Lisp_Object | |
| 95 mark_symbol (Lisp_Object obj) | |
| 96 { | |
| 440 | 97 Lisp_Symbol *sym = XSYMBOL (obj); |
| 428 | 98 |
| 99 mark_object (sym->value); | |
| 100 mark_object (sym->function); | |
| 793 | 101 mark_object (sym->name); |
| 428 | 102 if (!symbol_next (sym)) |
| 103 return sym->plist; | |
| 104 else | |
| 105 { | |
| 106 mark_object (sym->plist); | |
| 107 /* Mark the rest of the symbols in the obarray hash-chain */ | |
| 108 sym = symbol_next (sym); | |
| 793 | 109 return wrap_symbol (sym); |
| 428 | 110 } |
| 111 } | |
| 112 | |
| 1204 | 113 static const struct memory_description symbol_description[] = { |
| 440 | 114 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, next) }, |
| 115 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, name) }, | |
| 116 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, value) }, | |
| 117 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, function) }, | |
| 118 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, plist) }, | |
| 428 | 119 { XD_END } |
| 120 }; | |
| 121 | |
| 442 | 122 /* Symbol plists are directly accessible, so we need to protect against |
| 123 invalid property list structure */ | |
| 124 | |
| 125 static Lisp_Object | |
| 126 symbol_getprop (Lisp_Object symbol, Lisp_Object property) | |
| 127 { | |
| 128 return external_plist_get (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME); | |
| 129 } | |
| 130 | |
| 131 static int | |
| 132 symbol_putprop (Lisp_Object symbol, Lisp_Object property, Lisp_Object value) | |
| 133 { | |
| 134 external_plist_put (&XSYMBOL (symbol)->plist, property, value, 0, ERROR_ME); | |
| 135 return 1; | |
| 136 } | |
| 137 | |
| 138 static int | |
| 139 symbol_remprop (Lisp_Object symbol, Lisp_Object property) | |
| 140 { | |
| 141 return external_remprop (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME); | |
| 142 } | |
| 143 | |
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144 DEFINE_DUMPABLE_FROB_BLOCK_LISP_OBJECT ("symbol", symbol, |
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145 mark_symbol, print_symbol, |
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146 0, 0, 0, symbol_description, |
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147 Lisp_Symbol); |
| 428 | 148 |
| 149 /**********************************************************************/ | |
| 150 /* Intern */ | |
| 151 /**********************************************************************/ | |
| 152 | |
| 153 /* #### using a vector here is way bogus. Use a hash table instead. */ | |
| 154 | |
| 155 Lisp_Object Vobarray; | |
| 156 | |
| 157 static Lisp_Object initial_obarray; | |
| 158 | |
| 159 /* oblookup stores the bucket number here, for the sake of Funintern. */ | |
| 160 | |
| 161 static int oblookup_last_bucket_number; | |
| 162 | |
| 163 static Lisp_Object | |
| 164 check_obarray (Lisp_Object obarray) | |
| 165 { | |
| 166 while (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0) | |
| 167 { | |
| 168 /* If Vobarray is now invalid, force it to be valid. */ | |
| 169 if (EQ (Vobarray, obarray)) Vobarray = initial_obarray; | |
| 170 | |
| 171 obarray = wrong_type_argument (Qvectorp, obarray); | |
| 172 } | |
| 173 return obarray; | |
| 174 } | |
| 175 | |
| 176 Lisp_Object | |
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177 intern_istring (const Ibyte *str) |
| 428 | 178 { |
| 771 | 179 Bytecount len = qxestrlen (str); |
| 428 | 180 Lisp_Object obarray = Vobarray; |
| 181 | |
| 182 if (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0) | |
| 183 obarray = check_obarray (obarray); | |
| 184 | |
| 185 { | |
| 771 | 186 Lisp_Object tem = oblookup (obarray, str, len); |
| 428 | 187 if (SYMBOLP (tem)) |
| 188 return tem; | |
| 189 } | |
| 190 | |
| 771 | 191 return Fintern (make_string (str, len), obarray); |
| 192 } | |
| 193 | |
| 194 Lisp_Object | |
| 867 | 195 intern (const CIbyte *str) |
| 771 | 196 { |
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197 return intern_istring ((Ibyte *) str); |
| 428 | 198 } |
| 199 | |
| 814 | 200 Lisp_Object |
| 867 | 201 intern_converting_underscores_to_dashes (const CIbyte *str) |
| 814 | 202 { |
| 203 Bytecount len = strlen (str); | |
| 867 | 204 CIbyte *tmp = alloca_extbytes (len + 1); |
| 814 | 205 Bytecount i; |
| 206 strcpy (tmp, str); | |
| 207 for (i = 0; i < len; i++) | |
| 208 if (tmp[i] == '_') | |
| 209 tmp[i] = '-'; | |
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210 return intern_istring ((Ibyte *) tmp); |
| 814 | 211 } |
| 212 | |
| 428 | 213 DEFUN ("intern", Fintern, 1, 2, 0, /* |
| 214 Return the canonical symbol whose name is STRING. | |
| 215 If there is none, one is created by this function and returned. | |
| 444 | 216 Optional second argument OBARRAY specifies the obarray to use; |
| 217 it defaults to the value of the variable `obarray'. | |
| 428 | 218 */ |
| 219 (string, obarray)) | |
| 220 { | |
| 221 Lisp_Object object, *ptr; | |
| 793 | 222 Lisp_Object symbol; |
| 428 | 223 Bytecount len; |
| 224 | |
| 225 if (NILP (obarray)) obarray = Vobarray; | |
| 226 obarray = check_obarray (obarray); | |
| 227 | |
| 228 CHECK_STRING (string); | |
| 229 | |
| 230 len = XSTRING_LENGTH (string); | |
| 231 object = oblookup (obarray, XSTRING_DATA (string), len); | |
| 232 if (!INTP (object)) | |
| 233 /* Found it */ | |
| 234 return object; | |
| 235 | |
| 236 ptr = &XVECTOR_DATA (obarray)[XINT (object)]; | |
| 237 | |
| 238 object = Fmake_symbol (string); | |
| 793 | 239 symbol = object; |
| 428 | 240 |
| 241 if (SYMBOLP (*ptr)) | |
| 793 | 242 XSYMBOL_NEXT (symbol) = XSYMBOL (*ptr); |
| 428 | 243 else |
| 793 | 244 XSYMBOL_NEXT (symbol) = 0; |
| 428 | 245 *ptr = object; |
| 246 | |
| 826 | 247 if (string_byte (XSYMBOL_NAME (symbol), 0) == ':' && EQ (obarray, Vobarray)) |
| 428 | 248 { |
| 249 /* The LISP way is to put keywords in their own package, but we | |
| 250 don't have packages, so we do something simpler. Someday, | |
| 251 maybe we'll have packages and then this will be reworked. | |
| 252 --Stig. */ | |
| 793 | 253 XSYMBOL_VALUE (symbol) = object; |
| 428 | 254 } |
| 255 | |
| 256 return object; | |
| 257 } | |
| 258 | |
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259 DEFUN ("intern-soft", Fintern_soft, 1, 3, 0, /* |
| 428 | 260 Return the canonical symbol named NAME, or nil if none exists. |
| 261 NAME may be a string or a symbol. If it is a symbol, that exact | |
| 262 symbol is searched for. | |
| 444 | 263 Optional second argument OBARRAY specifies the obarray to use; |
| 264 it defaults to the value of the variable `obarray'. | |
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265 Optional third argument DEFAULT says what Lisp object to return if there is |
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266 no canonical symbol named NAME, and defaults to nil. |
| 428 | 267 */ |
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268 (name, obarray, default_)) |
| 428 | 269 { |
| 270 Lisp_Object tem; | |
| 793 | 271 Lisp_Object string; |
| 428 | 272 |
| 273 if (NILP (obarray)) obarray = Vobarray; | |
| 274 obarray = check_obarray (obarray); | |
| 275 | |
| 276 if (!SYMBOLP (name)) | |
| 277 { | |
| 278 CHECK_STRING (name); | |
| 793 | 279 string = name; |
| 428 | 280 } |
| 281 else | |
| 282 string = symbol_name (XSYMBOL (name)); | |
| 283 | |
| 793 | 284 tem = oblookup (obarray, XSTRING_DATA (string), XSTRING_LENGTH (string)); |
| 428 | 285 if (INTP (tem) || (SYMBOLP (name) && !EQ (name, tem))) |
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286 return default_; |
| 428 | 287 else |
| 288 return tem; | |
| 289 } | |
| 290 | |
| 291 DEFUN ("unintern", Funintern, 1, 2, 0, /* | |
| 292 Delete the symbol named NAME, if any, from OBARRAY. | |
| 293 The value is t if a symbol was found and deleted, nil otherwise. | |
| 294 NAME may be a string or a symbol. If it is a symbol, that symbol | |
| 295 is deleted, if it belongs to OBARRAY--no other symbol is deleted. | |
| 444 | 296 OBARRAY defaults to the value of the variable `obarray'. |
| 428 | 297 */ |
| 298 (name, obarray)) | |
| 299 { | |
| 300 Lisp_Object tem; | |
| 793 | 301 Lisp_Object string; |
| 428 | 302 int hash; |
| 303 | |
| 304 if (NILP (obarray)) obarray = Vobarray; | |
| 305 obarray = check_obarray (obarray); | |
| 306 | |
| 307 if (SYMBOLP (name)) | |
| 308 string = symbol_name (XSYMBOL (name)); | |
| 309 else | |
| 310 { | |
| 311 CHECK_STRING (name); | |
| 793 | 312 string = name; |
| 428 | 313 } |
| 314 | |
| 793 | 315 tem = oblookup (obarray, XSTRING_DATA (string), XSTRING_LENGTH (string)); |
| 428 | 316 if (INTP (tem)) |
| 317 return Qnil; | |
| 318 /* If arg was a symbol, don't delete anything but that symbol itself. */ | |
| 319 if (SYMBOLP (name) && !EQ (name, tem)) | |
| 320 return Qnil; | |
| 321 | |
| 322 hash = oblookup_last_bucket_number; | |
| 323 | |
| 324 if (EQ (XVECTOR_DATA (obarray)[hash], tem)) | |
| 325 { | |
| 326 if (XSYMBOL (tem)->next) | |
| 793 | 327 XVECTOR_DATA (obarray)[hash] = wrap_symbol (XSYMBOL (tem)->next); |
| 428 | 328 else |
| 329 XVECTOR_DATA (obarray)[hash] = Qzero; | |
| 330 } | |
| 331 else | |
| 332 { | |
| 333 Lisp_Object tail, following; | |
| 334 | |
| 335 for (tail = XVECTOR_DATA (obarray)[hash]; | |
| 336 XSYMBOL (tail)->next; | |
| 337 tail = following) | |
| 338 { | |
| 793 | 339 following = wrap_symbol (XSYMBOL (tail)->next); |
| 428 | 340 if (EQ (following, tem)) |
| 341 { | |
| 342 XSYMBOL (tail)->next = XSYMBOL (following)->next; | |
| 343 break; | |
| 344 } | |
| 345 } | |
| 346 } | |
| 347 return Qt; | |
| 348 } | |
| 349 | |
| 350 /* Return the symbol in OBARRAY whose names matches the string | |
| 351 of SIZE characters at PTR. If there is no such symbol in OBARRAY, | |
| 352 return the index into OBARRAY that the string hashes to. | |
| 353 | |
| 354 Also store the bucket number in oblookup_last_bucket_number. */ | |
| 355 | |
| 356 Lisp_Object | |
| 867 | 357 oblookup (Lisp_Object obarray, const Ibyte *ptr, Bytecount size) |
| 428 | 358 { |
| 490 | 359 unsigned int hash, obsize; |
| 440 | 360 Lisp_Symbol *tail; |
| 428 | 361 Lisp_Object bucket; |
| 362 | |
| 363 if (!VECTORP (obarray) || | |
| 364 (obsize = XVECTOR_LENGTH (obarray)) == 0) | |
| 365 { | |
| 366 obarray = check_obarray (obarray); | |
| 367 obsize = XVECTOR_LENGTH (obarray); | |
| 368 } | |
| 369 hash = hash_string (ptr, size) % obsize; | |
| 370 oblookup_last_bucket_number = hash; | |
| 371 bucket = XVECTOR_DATA (obarray)[hash]; | |
| 372 if (ZEROP (bucket)) | |
| 373 ; | |
| 374 else if (!SYMBOLP (bucket)) | |
| 563 | 375 signal_error (Qinvalid_state, "Bad data in guts of obarray", Qunbound); /* Like CADR error message */ |
| 428 | 376 else |
| 377 for (tail = XSYMBOL (bucket); ;) | |
| 378 { | |
| 793 | 379 if (XSTRING_LENGTH (tail->name) == size && |
| 380 !memcmp (XSTRING_DATA (tail->name), ptr, size)) | |
| 428 | 381 { |
| 793 | 382 return wrap_symbol (tail); |
| 428 | 383 } |
| 384 tail = symbol_next (tail); | |
| 385 if (!tail) | |
| 386 break; | |
| 387 } | |
| 388 return make_int (hash); | |
| 389 } | |
| 390 | |
| 490 | 391 /* An excellent string hashing function. |
| 392 Adapted from glib's g_str_hash(). | |
| 393 Investigation by Karl Nelson <kenelson@ece.ucdavis.edu>. | |
| 394 Do a web search for "g_str_hash X31_HASH" if you want to know more. */ | |
| 395 unsigned int | |
| 867 | 396 hash_string (const Ibyte *ptr, Bytecount len) |
| 428 | 397 { |
| 490 | 398 unsigned int hash; |
| 399 | |
| 400 for (hash = 0; len; len--, ptr++) | |
| 401 /* (31 * hash) will probably be optimized to ((hash << 5) - hash). */ | |
| 402 hash = 31 * hash + *ptr; | |
| 403 | |
| 404 return hash; | |
| 428 | 405 } |
| 406 | |
| 407 /* Map FN over OBARRAY. The mapping is stopped when FN returns a | |
| 408 non-zero value. */ | |
| 409 void | |
| 410 map_obarray (Lisp_Object obarray, | |
| 411 int (*fn) (Lisp_Object, void *), void *arg) | |
| 412 { | |
| 413 REGISTER int i; | |
| 414 | |
| 415 CHECK_VECTOR (obarray); | |
| 416 for (i = XVECTOR_LENGTH (obarray) - 1; i >= 0; i--) | |
| 417 { | |
| 418 Lisp_Object tail = XVECTOR_DATA (obarray)[i]; | |
| 419 if (SYMBOLP (tail)) | |
| 420 while (1) | |
| 421 { | |
| 440 | 422 Lisp_Symbol *next; |
| 428 | 423 if ((*fn) (tail, arg)) |
| 424 return; | |
| 425 next = symbol_next (XSYMBOL (tail)); | |
| 426 if (!next) | |
| 427 break; | |
| 793 | 428 tail = wrap_symbol (next); |
| 428 | 429 } |
| 430 } | |
| 431 } | |
| 432 | |
| 433 static int | |
| 434 mapatoms_1 (Lisp_Object sym, void *arg) | |
| 435 { | |
| 436 call1 (*(Lisp_Object *)arg, sym); | |
| 437 return 0; | |
| 438 } | |
| 439 | |
| 440 DEFUN ("mapatoms", Fmapatoms, 1, 2, 0, /* | |
| 441 Call FUNCTION on every symbol in OBARRAY. | |
| 442 OBARRAY defaults to the value of `obarray'. | |
| 443 */ | |
| 444 (function, obarray)) | |
| 445 { | |
| 442 | 446 struct gcpro gcpro1; |
| 447 | |
| 428 | 448 if (NILP (obarray)) |
| 449 obarray = Vobarray; | |
| 450 obarray = check_obarray (obarray); | |
| 451 | |
| 442 | 452 GCPRO1 (obarray); |
| 428 | 453 map_obarray (obarray, mapatoms_1, &function); |
| 442 | 454 UNGCPRO; |
| 428 | 455 return Qnil; |
| 456 } | |
| 457 | |
| 458 | |
| 459 /**********************************************************************/ | |
| 460 /* Apropos */ | |
| 461 /**********************************************************************/ | |
| 462 | |
| 463 struct appropos_mapper_closure | |
| 464 { | |
| 465 Lisp_Object regexp; | |
| 466 Lisp_Object predicate; | |
| 467 Lisp_Object accumulation; | |
| 468 }; | |
| 469 | |
| 470 static int | |
| 471 apropos_mapper (Lisp_Object symbol, void *arg) | |
| 472 { | |
| 473 struct appropos_mapper_closure *closure = | |
| 474 (struct appropos_mapper_closure *) arg; | |
| 475 Bytecount match = fast_lisp_string_match (closure->regexp, | |
| 476 Fsymbol_name (symbol)); | |
| 477 | |
| 478 if (match >= 0 && | |
| 479 (NILP (closure->predicate) || | |
| 480 !NILP (call1 (closure->predicate, symbol)))) | |
| 481 closure->accumulation = Fcons (symbol, closure->accumulation); | |
| 482 | |
| 483 return 0; | |
| 484 } | |
| 485 | |
| 486 DEFUN ("apropos-internal", Fapropos_internal, 1, 2, 0, /* | |
| 444 | 487 Return a list of all symbols whose names contain match for REGEXP. |
| 488 If optional 2nd arg PREDICATE is non-nil, only symbols for which | |
| 489 \(funcall PREDICATE SYMBOL) returns non-nil are returned. | |
| 428 | 490 */ |
| 491 (regexp, predicate)) | |
| 492 { | |
| 493 struct appropos_mapper_closure closure; | |
| 442 | 494 struct gcpro gcpro1; |
| 428 | 495 |
| 496 CHECK_STRING (regexp); | |
| 497 | |
| 498 closure.regexp = regexp; | |
| 499 closure.predicate = predicate; | |
| 500 closure.accumulation = Qnil; | |
| 442 | 501 GCPRO1 (closure.accumulation); |
| 428 | 502 map_obarray (Vobarray, apropos_mapper, &closure); |
|
5182
2e528066e2fc
Move #'sort*, #'fill, #'merge to C from cl-seq.el.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5157
diff
changeset
|
503 closure.accumulation = list_sort (closure.accumulation, NULL, Qstring_lessp, |
|
2e528066e2fc
Move #'sort*, #'fill, #'merge to C from cl-seq.el.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5157
diff
changeset
|
504 Qidentity); |
| 442 | 505 UNGCPRO; |
| 428 | 506 return closure.accumulation; |
| 507 } | |
| 508 | |
| 509 | |
| 510 /* Extract and set components of symbols */ | |
| 511 | |
| 512 static void set_up_buffer_local_cache (Lisp_Object sym, | |
| 513 struct symbol_value_buffer_local *bfwd, | |
| 514 struct buffer *buf, | |
| 515 Lisp_Object new_alist_el, | |
| 516 int set_it_p); | |
| 517 | |
| 518 DEFUN ("boundp", Fboundp, 1, 1, 0, /* | |
| 519 Return t if SYMBOL's value is not void. | |
| 520 */ | |
| 521 (symbol)) | |
| 522 { | |
| 523 CHECK_SYMBOL (symbol); | |
| 524 return UNBOUNDP (find_symbol_value (symbol)) ? Qnil : Qt; | |
| 525 } | |
| 526 | |
| 527 DEFUN ("globally-boundp", Fglobally_boundp, 1, 1, 0, /* | |
| 528 Return t if SYMBOL has a global (non-bound) value. | |
| 529 This is for the byte-compiler; you really shouldn't be using this. | |
| 530 */ | |
| 531 (symbol)) | |
| 532 { | |
| 533 CHECK_SYMBOL (symbol); | |
| 534 return UNBOUNDP (top_level_value (symbol)) ? Qnil : Qt; | |
| 535 } | |
| 536 | |
| 537 DEFUN ("fboundp", Ffboundp, 1, 1, 0, /* | |
| 538 Return t if SYMBOL's function definition is not void. | |
| 539 */ | |
| 540 (symbol)) | |
| 541 { | |
| 542 CHECK_SYMBOL (symbol); | |
| 543 return UNBOUNDP (XSYMBOL (symbol)->function) ? Qnil : Qt; | |
| 544 } | |
| 545 | |
| 546 /* Return non-zero if SYM's value or function (the current contents of | |
| 547 which should be passed in as VAL) is constant, i.e. unsettable. */ | |
| 548 | |
| 549 static int | |
| 550 symbol_is_constant (Lisp_Object sym, Lisp_Object val) | |
| 551 { | |
| 552 /* #### - I wonder if it would be better to just have a new magic value | |
| 553 type and make nil, t, and all keywords have that same magic | |
| 554 constant_symbol value. This test is awfully specific about what is | |
| 555 constant and what isn't. --Stig */ | |
| 556 if (EQ (sym, Qnil) || | |
| 557 EQ (sym, Qt)) | |
| 558 return 1; | |
| 559 | |
| 560 if (SYMBOL_VALUE_MAGIC_P (val)) | |
| 561 switch (XSYMBOL_VALUE_MAGIC_TYPE (val)) | |
| 562 { | |
| 563 case SYMVAL_CONST_OBJECT_FORWARD: | |
| 564 case SYMVAL_CONST_SPECIFIER_FORWARD: | |
| 565 case SYMVAL_CONST_FIXNUM_FORWARD: | |
| 566 case SYMVAL_CONST_BOOLEAN_FORWARD: | |
| 567 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: | |
| 568 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: | |
| 569 return 1; | |
| 570 default: break; /* Warning suppression */ | |
| 571 } | |
| 572 | |
| 573 /* We don't return true for keywords here because they are handled | |
| 574 specially by reject_constant_symbols(). */ | |
| 575 return 0; | |
| 576 } | |
| 577 | |
| 578 /* We are setting SYM's value slot (or function slot, if FUNCTION_P is | |
| 579 non-zero) to NEWVAL. Make sure this is allowed. | |
| 580 FOLLOW_PAST_LISP_MAGIC specifies whether we delve past | |
| 581 symbol-value-lisp-magic objects. */ | |
| 582 | |
| 583 void | |
| 584 reject_constant_symbols (Lisp_Object sym, Lisp_Object newval, int function_p, | |
| 585 Lisp_Object follow_past_lisp_magic) | |
| 586 { | |
| 587 Lisp_Object val = | |
| 588 (function_p ? XSYMBOL (sym)->function | |
| 589 : fetch_value_maybe_past_magic (sym, follow_past_lisp_magic)); | |
| 590 | |
| 591 if (SYMBOL_VALUE_MAGIC_P (val) && | |
| 592 XSYMBOL_VALUE_MAGIC_TYPE (val) == SYMVAL_CONST_SPECIFIER_FORWARD) | |
| 563 | 593 invalid_change ("Use `set-specifier' to change a specifier's value", |
| 594 sym); | |
| 428 | 595 |
| 996 | 596 if ( |
| 597 #ifdef HAVE_SHLIB | |
| 598 !(unloading_module && UNBOUNDP(newval)) && | |
| 599 #endif | |
| 600 (symbol_is_constant (sym, val) | |
|
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5182
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|
601 #ifdef NEED_TO_HANDLE_21_4_CODE |
|
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|
602 || (SYMBOL_IS_KEYWORD (sym) && !EQ (newval, sym)) |
|
8b50bee3c88c
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diff
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|
603 #endif |
|
8b50bee3c88c
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4677
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|
604 )) |
| 563 | 605 signal_error_1 (Qsetting_constant, |
| 606 UNBOUNDP (newval) ? list1 (sym) : list2 (sym, newval)); | |
| 428 | 607 } |
| 608 | |
| 609 /* Verify that it's ok to make SYM buffer-local. This rejects | |
| 610 constants and default-buffer-local variables. FOLLOW_PAST_LISP_MAGIC | |
| 611 specifies whether we delve into symbol-value-lisp-magic objects. | |
| 612 (Should be a symbol indicating what action is being taken; that way, | |
| 613 we don't delve if there's a handler for that action, but do otherwise.) */ | |
| 614 | |
| 615 static void | |
| 616 verify_ok_for_buffer_local (Lisp_Object sym, | |
| 617 Lisp_Object follow_past_lisp_magic) | |
| 618 { | |
| 619 Lisp_Object val = fetch_value_maybe_past_magic (sym, follow_past_lisp_magic); | |
| 620 | |
| 621 if (symbol_is_constant (sym, val)) | |
| 622 goto not_ok; | |
| 623 if (SYMBOL_VALUE_MAGIC_P (val)) | |
| 624 switch (XSYMBOL_VALUE_MAGIC_TYPE (val)) | |
| 625 { | |
| 626 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 627 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 628 /* #### It's theoretically possible for it to be reasonable | |
| 629 to have both console-local and buffer-local variables, | |
| 630 but I don't want to consider that right now. */ | |
| 631 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 632 goto not_ok; | |
| 633 default: break; /* Warning suppression */ | |
| 634 } | |
| 635 | |
| 636 return; | |
| 637 | |
| 638 not_ok: | |
| 563 | 639 invalid_change ("Symbol may not be buffer-local", sym); |
| 428 | 640 } |
| 641 | |
| 642 DEFUN ("makunbound", Fmakunbound, 1, 1, 0, /* | |
| 643 Make SYMBOL's value be void. | |
| 644 */ | |
| 645 (symbol)) | |
| 646 { | |
| 647 Fset (symbol, Qunbound); | |
| 648 return symbol; | |
| 649 } | |
| 650 | |
| 651 DEFUN ("fmakunbound", Ffmakunbound, 1, 1, 0, /* | |
| 652 Make SYMBOL's function definition be void. | |
| 653 */ | |
| 654 (symbol)) | |
| 655 { | |
| 656 CHECK_SYMBOL (symbol); | |
| 657 reject_constant_symbols (symbol, Qunbound, 1, Qt); | |
| 658 XSYMBOL (symbol)->function = Qunbound; | |
| 659 return symbol; | |
| 660 } | |
| 661 | |
| 662 DEFUN ("symbol-function", Fsymbol_function, 1, 1, 0, /* | |
| 663 Return SYMBOL's function definition. Error if that is void. | |
| 664 */ | |
| 665 (symbol)) | |
| 666 { | |
| 667 CHECK_SYMBOL (symbol); | |
| 668 if (UNBOUNDP (XSYMBOL (symbol)->function)) | |
| 669 signal_void_function_error (symbol); | |
| 670 return XSYMBOL (symbol)->function; | |
| 671 } | |
| 672 | |
| 673 DEFUN ("symbol-plist", Fsymbol_plist, 1, 1, 0, /* | |
| 674 Return SYMBOL's property list. | |
| 675 */ | |
| 676 (symbol)) | |
| 677 { | |
| 678 CHECK_SYMBOL (symbol); | |
| 679 return XSYMBOL (symbol)->plist; | |
| 680 } | |
| 681 | |
| 682 DEFUN ("symbol-name", Fsymbol_name, 1, 1, 0, /* | |
| 683 Return SYMBOL's name, a string. | |
| 684 */ | |
| 685 (symbol)) | |
| 686 { | |
| 687 CHECK_SYMBOL (symbol); | |
| 793 | 688 return XSYMBOL (symbol)->name; |
| 428 | 689 } |
| 690 | |
| 691 DEFUN ("fset", Ffset, 2, 2, 0, /* | |
| 692 Set SYMBOL's function definition to NEWDEF, and return NEWDEF. | |
| 693 */ | |
| 694 (symbol, newdef)) | |
| 695 { | |
| 696 /* This function can GC */ | |
| 697 CHECK_SYMBOL (symbol); | |
| 698 reject_constant_symbols (symbol, newdef, 1, Qt); | |
| 699 if (!NILP (Vautoload_queue) && !UNBOUNDP (XSYMBOL (symbol)->function)) | |
| 700 Vautoload_queue = Fcons (Fcons (symbol, XSYMBOL (symbol)->function), | |
| 701 Vautoload_queue); | |
| 702 XSYMBOL (symbol)->function = newdef; | |
| 703 /* Handle automatic advice activation */ | |
| 704 if (CONSP (XSYMBOL (symbol)->plist) && | |
| 705 !NILP (Fget (symbol, Qad_advice_info, Qnil))) | |
| 706 { | |
| 707 call2 (Qad_activate, symbol, Qnil); | |
| 708 newdef = XSYMBOL (symbol)->function; | |
| 709 } | |
| 710 return newdef; | |
| 711 } | |
| 712 | |
| 713 /* FSFmacs */ | |
| 714 DEFUN ("define-function", Fdefine_function, 2, 2, 0, /* | |
| 715 Set SYMBOL's function definition to NEWDEF, and return NEWDEF. | |
| 716 Associates the function with the current load file, if any. | |
|
4921
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Ben Wing <ben@xemacs.org>
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4905
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|
717 If NEWDEF is a compiled-function object, stores the function name in |
|
17362f371cc2
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|
718 the `annotated' slot of the compiled-function (retrievable using |
|
17362f371cc2
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|
719 `compiled-function-annotation'). |
| 428 | 720 */ |
| 721 (symbol, newdef)) | |
| 722 { | |
| 723 /* This function can GC */ | |
| 724 Ffset (symbol, newdef); | |
|
4535
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Distinguish vars and functions in #'symbol-file, #'describe-{function,variable}
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|
725 LOADHIST_ATTACH (Fcons (Qdefun, symbol)); |
|
4921
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|
726 #ifdef COMPILED_FUNCTION_ANNOTATION_HACK |
|
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|
727 if (COMPILED_FUNCTIONP (newdef)) |
|
17362f371cc2
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|
728 XCOMPILED_FUNCTION (newdef)->annotated = symbol; |
|
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|
729 #endif /* COMPILED_FUNCTION_ANNOTATION_HACK */ |
| 428 | 730 return newdef; |
| 731 } | |
| 732 | |
| 3368 | 733 DEFUN ("subr-name", Fsubr_name, 1, 1, 0, /* |
| 734 Return name of function SUBR. | |
| 735 SUBR must be a built-in function. | |
| 736 */ | |
| 737 (subr)) | |
| 738 { | |
|
4952
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
739 const Ascbyte *name; |
| 3497 | 740 CHECK_SUBR (subr); |
| 741 | |
| 3368 | 742 name = XSUBR (subr)->name; |
| 3379 | 743 return make_string ((const Ibyte *)name, strlen (name)); |
| 3368 | 744 } |
| 428 | 745 |
|
4905
755ae5b97edb
Change "special form" to "special operator" in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4793
diff
changeset
|
746 DEFUN ("special-operator-p", Fspecial_operator_p, 1, 1, 0, /* |
|
755ae5b97edb
Change "special form" to "special operator" in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4793
diff
changeset
|
747 Return whether SUBR is a special operator. |
|
755ae5b97edb
Change "special form" to "special operator" in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4793
diff
changeset
|
748 |
|
755ae5b97edb
Change "special form" to "special operator" in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4793
diff
changeset
|
749 A special operator is a built-in function (a subr, that is a function |
|
4337
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4336
diff
changeset
|
750 implemented in C, not Lisp) which does not necessarily evaluate all its |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4336
diff
changeset
|
751 arguments. Much of the basic XEmacs Lisp syntax is implemented by means of |
|
4905
755ae5b97edb
Change "special form" to "special operator" in our sources.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4793
diff
changeset
|
752 special operators; examples are `let', `condition-case', `setq', and so |
|
4337
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
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4336
diff
changeset
|
753 on. |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
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diff
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|
754 |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4336
diff
changeset
|
755 If you intend to write a Lisp function that does not necessarily evaluate |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
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diff
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|
756 all its arguments, the portable (across emacs variants, and across Lisp |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4336
diff
changeset
|
757 implementations) way to go about it is to write a macro instead. See |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4336
diff
changeset
|
758 `defmacro' and `backquote'. |
|
4336
cdc2f70d4319
Provide #'special-form-p, for the use of advice.el, perhaps other files.
Aidan Kehoe <kehoea@parhasard.net>
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diff
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|
759 */ |
|
cdc2f70d4319
Provide #'special-form-p, for the use of advice.el, perhaps other files.
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|
760 (subr)) |
|
cdc2f70d4319
Provide #'special-form-p, for the use of advice.el, perhaps other files.
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parents:
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changeset
|
761 { |
|
4337
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|
762 subr = indirect_function (subr, 0); |
|
c32e4dca0296
#'special-form-p; don't error (thank you Jerry James); flesh out docstring.
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|
763 return (SUBRP (subr) && XSUBR (subr)->max_args == UNEVALLED) ? Qt : Qnil; |
|
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Provide #'special-form-p, for the use of advice.el, perhaps other files.
Aidan Kehoe <kehoea@parhasard.net>
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changeset
|
764 } |
|
cdc2f70d4319
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|
765 |
| 428 | 766 DEFUN ("setplist", Fsetplist, 2, 2, 0, /* |
| 767 Set SYMBOL's property list to NEWPLIST, and return NEWPLIST. | |
| 768 */ | |
| 769 (symbol, newplist)) | |
| 770 { | |
| 771 CHECK_SYMBOL (symbol); | |
| 772 | |
| 773 XSYMBOL (symbol)->plist = newplist; | |
| 774 return newplist; | |
| 775 } | |
| 776 | |
| 777 | |
| 778 /**********************************************************************/ | |
| 779 /* symbol-value */ | |
| 780 /**********************************************************************/ | |
| 781 | |
|
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782 /* |
|
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783 NOTE NOTE NOTE: |
|
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|
784 --------------- |
|
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|
785 |
|
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|
786 There are various different uses of "magic" with regard to symbols, |
|
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|
787 and they need to be distinguished: |
|
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|
788 |
|
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|
789 1. `symbol-value-magic' class of objects (struct symbol_value_magic): |
|
9113c5044de8
(for main branch) add long comment about types of magic symbols
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|
790 A set of Lisp object types used as the value of a variable with any |
|
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(for main branch) add long comment about types of magic symbols
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diff
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|
791 behavior other than just a plain repository of a value. This |
|
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792 includes buffer-local variables, console-local variables, read-only |
|
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|
793 variables, variable aliases, variables that are linked to a C |
|
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|
794 variable, etc. The more specific types are: |
|
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|
795 |
|
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changeset
|
796 -- `symbol-value-forward': Variables that forward to a C variable. |
|
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(for main branch) add long comment about types of magic symbols
Ben Wing <ben@xemacs.org>
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changeset
|
797 NOTE:This includes built-in buffer-local and console-local |
|
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(for main branch) add long comment about types of magic symbols
Ben Wing <ben@xemacs.org>
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changeset
|
798 variables, since they forward to an element in a buffer or |
|
9113c5044de8
(for main branch) add long comment about types of magic symbols
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changeset
|
799 console structure. |
|
9113c5044de8
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Ben Wing <ben@xemacs.org>
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4793
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changeset
|
800 |
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801 -- `symbol-value-buffer-local': Variables on which |
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802 `make-local-variable' or `make-variable-buffer-local' have |
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803 been called. |
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804 |
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805 -- `symbol-value-lisp-magic': See below. |
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806 |
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807 -- `symbol-value-varalias': Variable aliases. |
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808 |
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809 2. `symbol-value-lisp-magic': Variables on which |
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810 `dontusethis-set-symbol-value-handler' have been called. These |
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811 variables are extra-magic in that operations that would normally |
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812 change their value instead get forwarded out to Lisp handlers, |
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813 which can do anything they want. (NOTE: Handlers for getting a |
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814 variable's value aren't implemented yet.) |
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815 |
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816 3. "magicfun" handlers on C-forwarding variables, declared with any |
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817 of the following: |
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818 |
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819 -- DEFVAR_LISP_MAGIC |
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820 -- DEFVAR_INT_MAGIC |
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821 -- DEFVAR_BOOL_MAGIC, |
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822 -- DEFVAR_BUFFER_LOCAL_MAGIC |
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823 -- DEFVAR_BUFFER_DEFAULTS_MAGIC |
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824 -- DEFVAR_CONSOLE_LOCAL_MAGIC |
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825 -- DEFVAR_CONSOLE_DEFAULTS_MAGIC |
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826 |
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827 Here, the "magic function" is a handler that is notified whenever the |
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828 value of a variable is changed, so that some other updating can take |
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829 place (e.g. setting redisplay-related dirty bits, updating a cache, |
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830 etc.). |
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831 |
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832 Note that DEFVAR_LISP_MAGIC does *NOT* have anything to do with |
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833 `symbol-value-lisp-magic'. The former refers to variables that can |
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834 hold an arbitrary Lisp object and forward to a C variable declared |
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835 `Lisp_Object foo', and have a "magicfun" as just described; the |
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836 latter are variables that have Lisp-level handlers that function |
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837 in *PLACE* of normal variable-setting mechanisms, and are established |
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838 with `dontusethis-set-symbol-value-handler', as described above. |
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839 */ |
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840 |
| 428 | 841 /* If the contents of the value cell of a symbol is one of the following |
| 842 three types of objects, then the symbol is "magic" in that setting | |
| 843 and retrieving its value doesn't just set or retrieve the raw | |
| 844 contents of the value cell. None of these objects can escape to | |
| 845 the user level, so there is no loss of generality. | |
| 846 | |
| 847 If a symbol is "unbound", then the contents of its value cell is | |
| 848 Qunbound. Despite appearances, this is *not* a symbol, but is a | |
| 849 symbol-value-forward object. This is so that printing it results | |
| 850 in "INTERNAL OBJECT (XEmacs bug?)", in case it leaks to Lisp, somehow. | |
| 851 | |
| 852 Logically all of the following objects are "symbol-value-magic" | |
| 853 objects, and there are some games played w.r.t. this (#### this | |
| 854 should be cleaned up). SYMBOL_VALUE_MAGIC_P is true for all of | |
| 855 the object types. XSYMBOL_VALUE_MAGIC_TYPE returns the type of | |
| 856 symbol-value-magic object. There are more than three types | |
| 857 returned by this macro: in particular, symbol-value-forward | |
| 858 has eight subtypes, and symbol-value-buffer-local has two. See | |
| 859 symeval.h. | |
| 860 | |
| 861 1. symbol-value-forward | |
| 862 | |
| 863 symbol-value-forward is used for variables whose actual contents | |
| 864 are stored in a C variable of some sort, and for Qunbound. The | |
| 865 lcheader.next field (which is only used to chain together free | |
| 866 lcrecords) holds a pointer to the actual C variable. Included | |
| 867 in this type are "buffer-local" variables that are actually | |
| 868 stored in the buffer object itself; in this case, the "pointer" | |
| 869 is an offset into the struct buffer structure. | |
| 870 | |
| 871 The subtypes are as follows: | |
| 872 | |
| 873 SYMVAL_OBJECT_FORWARD: | |
| 874 (declare with DEFVAR_LISP) | |
| 875 The value of this variable is stored in a C variable of type | |
| 876 "Lisp_Object". Setting this variable sets the C variable. | |
| 877 Accessing this variable retrieves a value from the C variable. | |
| 878 These variables can be buffer-local -- in this case, the | |
| 879 raw symbol-value field gets converted into a | |
| 880 symbol-value-buffer-local, whose "current_value" slot contains | |
| 881 the symbol-value-forward. (See below.) | |
| 882 | |
| 883 SYMVAL_FIXNUM_FORWARD: | |
| 458 | 884 (declare with DEFVAR_INT) |
| 885 Similar to SYMVAL_OBJECT_FORWARD except that the C variable | |
| 886 is of type "Fixnum", a typedef for "EMACS_INT", and the corresponding | |
| 887 lisp variable is always the corresponding integer. | |
| 888 | |
| 428 | 889 SYMVAL_BOOLEAN_FORWARD: |
| 458 | 890 (declare with DEFVAR_BOOL) |
| 428 | 891 Similar to SYMVAL_OBJECT_FORWARD except that the C variable |
| 458 | 892 is of type "int" and is a boolean. |
| 428 | 893 |
| 894 SYMVAL_CONST_OBJECT_FORWARD: | |
| 895 SYMVAL_CONST_FIXNUM_FORWARD: | |
| 896 SYMVAL_CONST_BOOLEAN_FORWARD: | |
| 897 (declare with DEFVAR_CONST_LISP, DEFVAR_CONST_INT, or | |
| 898 DEFVAR_CONST_BOOL) | |
| 899 Similar to SYMVAL_OBJECT_FORWARD, SYMVAL_FIXNUM_FORWARD, or | |
| 900 SYMVAL_BOOLEAN_FORWARD, respectively, except that the value cannot | |
| 901 be changed. | |
| 902 | |
| 903 SYMVAL_CONST_SPECIFIER_FORWARD: | |
| 904 (declare with DEFVAR_SPECIFIER) | |
| 440 | 905 Exactly like SYMVAL_CONST_OBJECT_FORWARD except that the error |
| 906 message you get when attempting to set the value says to use | |
| 428 | 907 `set-specifier' instead. |
| 908 | |
| 909 SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 910 (declare with DEFVAR_BUFFER_LOCAL) | |
| 911 This is used for built-in buffer-local variables -- i.e. | |
| 912 Lisp variables whose value is stored in the "struct buffer". | |
| 913 Variables of this sort always forward into C "Lisp_Object" | |
| 914 fields (although there's no reason in principle that other | |
| 915 types for ints and booleans couldn't be added). Note that | |
| 916 some of these variables are automatically local in each | |
| 917 buffer, while some are only local when they become set | |
| 918 (similar to `make-variable-buffer-local'). In these latter | |
| 919 cases, of course, the default value shows through in all | |
| 920 buffers in which the variable doesn't have a local value. | |
| 921 This is implemented by making sure the "struct buffer" field | |
| 922 always contains the correct value (whether it's local or | |
| 923 a default) and maintaining a mask in the "struct buffer" | |
| 924 indicating which fields are local. When `set-default' is | |
| 925 called on a variable that's not always local to all buffers, | |
| 926 it loops through each buffer and sets the corresponding | |
| 927 field in each buffer without a local value for the field, | |
| 928 according to the mask. | |
| 929 | |
| 930 Calling `make-local-variable' on a variable of this sort | |
| 931 only has the effect of maybe changing the current buffer's mask. | |
| 932 Calling `make-variable-buffer-local' on a variable of this | |
| 933 sort has no effect at all. | |
| 934 | |
| 935 SYMVAL_CONST_CURRENT_BUFFER_FORWARD: | |
| 936 (declare with DEFVAR_CONST_BUFFER_LOCAL) | |
| 937 Same as SYMVAL_CURRENT_BUFFER_FORWARD except that the | |
| 938 value cannot be set. | |
| 939 | |
| 940 SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 941 (declare with DEFVAR_BUFFER_DEFAULTS) | |
| 942 This is used for the Lisp variables that contain the | |
| 943 default values of built-in buffer-local variables. Setting | |
| 944 or referencing one of these variables forwards into a slot | |
| 945 in the special struct buffer Vbuffer_defaults. | |
| 946 | |
| 947 SYMVAL_UNBOUND_MARKER: | |
| 948 This is used for only one object, Qunbound. | |
| 949 | |
| 950 SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 951 (declare with DEFVAR_CONSOLE_LOCAL) | |
| 952 This is used for built-in console-local variables -- i.e. | |
| 953 Lisp variables whose value is stored in the "struct console". | |
| 954 These work just like built-in buffer-local variables. | |
| 955 However, calling `make-local-variable' or | |
| 956 `make-variable-buffer-local' on one of these variables | |
| 957 is currently disallowed because that would entail having | |
| 958 both console-local and buffer-local variables, which is | |
| 959 trickier to implement. | |
| 960 | |
| 961 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: | |
| 962 (declare with DEFVAR_CONST_CONSOLE_LOCAL) | |
| 963 Same as SYMVAL_SELECTED_CONSOLE_FORWARD except that the | |
| 964 value cannot be set. | |
| 965 | |
| 966 SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 967 (declare with DEFVAR_CONSOLE_DEFAULTS) | |
| 968 This is used for the Lisp variables that contain the | |
| 969 default values of built-in console-local variables. Setting | |
| 970 or referencing one of these variables forwards into a slot | |
| 971 in the special struct console Vconsole_defaults. | |
| 972 | |
| 973 | |
| 974 2. symbol-value-buffer-local | |
| 975 | |
| 976 symbol-value-buffer-local is used for variables that have had | |
| 977 `make-local-variable' or `make-variable-buffer-local' applied | |
| 978 to them. This object contains an alist mapping buffers to | |
| 979 values. In addition, the object contains a "current value", | |
| 980 which is the value in some buffer. Whenever you access the | |
| 981 variable with `symbol-value' or set it with `set' or `setq', | |
| 982 things are switched around so that the "current value" | |
| 983 refers to the current buffer, if it wasn't already. This | |
| 984 way, repeated references to a variable in the same buffer | |
| 985 are almost as efficient as if the variable weren't buffer | |
| 986 local. Note that the alist may not be up-to-date w.r.t. | |
| 987 the buffer whose value is current, as the "current value" | |
| 988 cache is normally only flushed into the alist when the | |
| 989 buffer it refers to changes. | |
| 990 | |
| 991 Note also that it is possible for `make-local-variable' | |
| 992 or `make-variable-buffer-local' to be called on a variable | |
| 993 that forwards into a C variable (i.e. a variable whose | |
| 994 value cell is a symbol-value-forward). In this case, | |
| 995 the value cell becomes a symbol-value-buffer-local (as | |
| 996 always), and the symbol-value-forward moves into | |
| 997 the "current value" cell in this object. Also, in | |
| 998 this case the "current value" *always* refers to the | |
| 999 current buffer, so that the values of the C variable | |
| 1000 always is the correct value for the current buffer. | |
| 1001 set_buffer_internal() automatically updates the current-value | |
| 1002 cells of all buffer-local variables that forward into C | |
| 1003 variables. (There is a list of all buffer-local variables | |
| 1004 that is maintained for this and other purposes.) | |
| 1005 | |
| 1006 Note that only certain types of `symbol-value-forward' objects | |
| 1007 can find their way into the "current value" cell of a | |
| 1008 `symbol-value-buffer-local' object: SYMVAL_OBJECT_FORWARD, | |
| 1009 SYMVAL_FIXNUM_FORWARD, SYMVAL_BOOLEAN_FORWARD, and | |
| 1010 SYMVAL_UNBOUND_MARKER. The SYMVAL_CONST_*_FORWARD cannot | |
| 1011 be buffer-local because they are unsettable; | |
| 1012 SYMVAL_DEFAULT_*_FORWARD cannot be buffer-local because that | |
| 1013 makes no sense; making SYMVAL_CURRENT_BUFFER_FORWARD buffer-local | |
| 1014 does not have much of an effect (it's already buffer-local); and | |
| 1015 SYMVAL_SELECTED_CONSOLE_FORWARD cannot be buffer-local because | |
| 1016 that's not currently implemented. | |
| 1017 | |
| 1018 | |
| 1019 3. symbol-value-varalias | |
| 1020 | |
| 1021 A symbol-value-varalias object is used for variables that | |
| 1022 are aliases for other variables. This object contains | |
| 1023 the symbol that this variable is aliased to. | |
| 1024 symbol-value-varalias objects cannot occur anywhere within | |
| 1025 a symbol-value-buffer-local object, and most of the | |
| 1026 low-level functions below do not accept them; you need | |
| 1027 to call follow_varalias_pointers to get the actual | |
| 1028 symbol to operate on. */ | |
| 1029 | |
| 1204 | 1030 static const struct memory_description symbol_value_buffer_local_description[] = { |
| 1031 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, default_value) }, | |
| 1032 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_value) }, | |
| 1033 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_buffer) }, | |
| 1034 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_alist_element) }, | |
| 1035 { XD_END } | |
| 1036 }; | |
| 1037 | |
| 428 | 1038 static Lisp_Object |
| 1039 mark_symbol_value_buffer_local (Lisp_Object obj) | |
| 1040 { | |
| 1041 struct symbol_value_buffer_local *bfwd; | |
| 1042 | |
| 800 | 1043 #ifdef ERROR_CHECK_TYPES |
| 428 | 1044 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_BUFFER_LOCAL || |
| 1045 XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_SOME_BUFFER_LOCAL); | |
| 1046 #endif | |
| 1047 | |
| 1048 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (obj); | |
| 1049 mark_object (bfwd->default_value); | |
| 1050 mark_object (bfwd->current_value); | |
| 1051 mark_object (bfwd->current_buffer); | |
| 1052 return bfwd->current_alist_element; | |
| 1053 } | |
| 1054 | |
| 1204 | 1055 |
| 1056 static const struct memory_description symbol_value_lisp_magic_description[] = { | |
| 1057 { XD_LISP_OBJECT_ARRAY, offsetof (struct symbol_value_lisp_magic, handler), MAGIC_HANDLER_MAX }, | |
| 1058 { XD_LISP_OBJECT_ARRAY, offsetof (struct symbol_value_lisp_magic, harg), MAGIC_HANDLER_MAX }, | |
| 1059 { XD_LISP_OBJECT, offsetof (struct symbol_value_lisp_magic, shadowed) }, | |
| 1060 { XD_END } | |
| 1061 }; | |
| 1062 | |
| 428 | 1063 static Lisp_Object |
| 1064 mark_symbol_value_lisp_magic (Lisp_Object obj) | |
| 1065 { | |
| 1066 struct symbol_value_lisp_magic *bfwd; | |
| 1067 int i; | |
| 1068 | |
| 1069 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_LISP_MAGIC); | |
| 1070 | |
| 1071 bfwd = XSYMBOL_VALUE_LISP_MAGIC (obj); | |
| 1072 for (i = 0; i < MAGIC_HANDLER_MAX; i++) | |
| 1073 { | |
| 1074 mark_object (bfwd->handler[i]); | |
| 1075 mark_object (bfwd->harg[i]); | |
| 1076 } | |
| 1077 return bfwd->shadowed; | |
| 1078 } | |
| 1079 | |
| 1204 | 1080 static const struct memory_description symbol_value_varalias_description[] = { |
| 1081 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, aliasee) }, | |
| 1082 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, shadowed) }, | |
| 1083 { XD_END } | |
| 1084 }; | |
| 1085 | |
| 428 | 1086 static Lisp_Object |
| 1087 mark_symbol_value_varalias (Lisp_Object obj) | |
| 1088 { | |
| 1089 struct symbol_value_varalias *bfwd; | |
| 1090 | |
| 1091 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_VARALIAS); | |
| 1092 | |
| 1093 bfwd = XSYMBOL_VALUE_VARALIAS (obj); | |
| 1094 mark_object (bfwd->shadowed); | |
| 1095 return bfwd->aliasee; | |
| 1096 } | |
| 1097 | |
| 1098 /* Should never, ever be called. (except by an external debugger) */ | |
| 1099 void | |
| 2286 | 1100 print_symbol_value_magic (Lisp_Object obj, Lisp_Object printcharfun, |
| 1101 int UNUSED (escapeflag)) | |
| 428 | 1102 { |
| 800 | 1103 write_fmt_string (printcharfun, |
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1104 "#<INTERNAL OBJECT (XEmacs bug?) (%s type %d) 0x%x>", |
| 800 | 1105 XRECORD_LHEADER_IMPLEMENTATION (obj)->name, |
| 1106 XSYMBOL_VALUE_MAGIC_TYPE (obj), | |
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1107 LISP_OBJECT_UID (obj)); |
| 428 | 1108 } |
| 1109 | |
| 1204 | 1110 static const struct memory_description symbol_value_forward_description[] = { |
| 428 | 1111 { XD_END } |
| 1112 }; | |
| 1113 | |
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1114 DEFINE_DUMPABLE_LISP_OBJECT ("symbol-value-forward", |
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1115 symbol_value_forward, |
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1116 0, |
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1117 print_symbol_value_magic, 0, 0, 0, |
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1118 symbol_value_forward_description, |
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1119 struct symbol_value_forward); |
| 934 | 1120 |
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1121 DEFINE_DUMPABLE_LISP_OBJECT ("symbol-value-buffer-local", |
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1122 symbol_value_buffer_local, |
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1123 mark_symbol_value_buffer_local, |
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1124 print_symbol_value_magic, 0, 0, 0, |
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1125 symbol_value_buffer_local_description, |
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1126 struct symbol_value_buffer_local); |
| 934 | 1127 |
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1128 DEFINE_DUMPABLE_LISP_OBJECT ("symbol-value-lisp-magic", |
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1129 symbol_value_lisp_magic, |
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1130 mark_symbol_value_lisp_magic, |
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1131 print_symbol_value_magic, 0, 0, 0, |
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1132 symbol_value_lisp_magic_description, |
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1133 struct symbol_value_lisp_magic); |
| 934 | 1134 |
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1135 DEFINE_DUMPABLE_LISP_OBJECT ("symbol-value-varalias", |
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1136 symbol_value_varalias, |
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1137 mark_symbol_value_varalias, |
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1138 print_symbol_value_magic, 0, 0, 0, |
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1139 symbol_value_varalias_description, |
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1140 struct symbol_value_varalias); |
| 934 | 1141 |
| 428 | 1142 |
| 1143 /* Getting and setting values of symbols */ | |
| 1144 | |
| 1145 /* Given the raw contents of a symbol value cell, return the Lisp value of | |
| 1146 the symbol. However, VALCONTENTS cannot be a symbol-value-buffer-local, | |
| 1147 symbol-value-lisp-magic, or symbol-value-varalias. | |
| 1148 | |
| 1149 BUFFER specifies a buffer, and is used for built-in buffer-local | |
| 1150 variables, which are of type SYMVAL_CURRENT_BUFFER_FORWARD. | |
| 1151 Note that such variables are never encapsulated in a | |
| 1152 symbol-value-buffer-local structure. | |
| 1153 | |
| 1154 CONSOLE specifies a console, and is used for built-in console-local | |
| 1155 variables, which are of type SYMVAL_SELECTED_CONSOLE_FORWARD. | |
| 1156 Note that such variables are (currently) never encapsulated in a | |
| 1157 symbol-value-buffer-local structure. | |
| 1158 */ | |
| 1159 | |
| 1160 static Lisp_Object | |
| 1161 do_symval_forwarding (Lisp_Object valcontents, struct buffer *buffer, | |
| 1162 struct console *console) | |
| 1163 { | |
| 442 | 1164 const struct symbol_value_forward *fwd; |
| 428 | 1165 |
| 1166 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1167 return valcontents; | |
| 1168 | |
| 1169 fwd = XSYMBOL_VALUE_FORWARD (valcontents); | |
| 1170 switch (fwd->magic.type) | |
| 1171 { | |
| 1172 case SYMVAL_FIXNUM_FORWARD: | |
| 1173 case SYMVAL_CONST_FIXNUM_FORWARD: | |
| 458 | 1174 return make_int (*((Fixnum *)symbol_value_forward_forward (fwd))); |
| 428 | 1175 |
| 1176 case SYMVAL_BOOLEAN_FORWARD: | |
| 1177 case SYMVAL_CONST_BOOLEAN_FORWARD: | |
| 1178 return *((int *)symbol_value_forward_forward (fwd)) ? Qt : Qnil; | |
| 1179 | |
| 1180 case SYMVAL_OBJECT_FORWARD: | |
| 1181 case SYMVAL_CONST_OBJECT_FORWARD: | |
| 1182 case SYMVAL_CONST_SPECIFIER_FORWARD: | |
| 1183 return *((Lisp_Object *)symbol_value_forward_forward (fwd)); | |
| 1184 | |
| 1185 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
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1186 return (*((Lisp_Object *)((Rawbyte *) XBUFFER (Vbuffer_defaults) |
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1187 + ((Rawbyte *)symbol_value_forward_forward (fwd) |
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1188 - (Rawbyte *)&buffer_local_flags)))); |
| 428 | 1189 |
| 1190 | |
| 1191 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1192 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: | |
| 1193 assert (buffer); | |
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1194 return (*((Lisp_Object *)((Rawbyte *)buffer |
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1195 + ((Rawbyte *)symbol_value_forward_forward (fwd) |
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1196 - (Rawbyte *)&buffer_local_flags)))); |
| 428 | 1197 |
| 1198 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
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1199 return (*((Lisp_Object *)((Rawbyte *) XCONSOLE (Vconsole_defaults) |
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1200 + ((Rawbyte *)symbol_value_forward_forward (fwd) |
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1201 - (Rawbyte *)&console_local_flags)))); |
| 428 | 1202 |
| 1203 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1204 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: | |
| 1205 assert (console); | |
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1206 return (*((Lisp_Object *)((Rawbyte *)console |
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1207 + ((Rawbyte *)symbol_value_forward_forward (fwd) |
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1208 - (Rawbyte *)&console_local_flags)))); |
| 428 | 1209 |
| 1210 case SYMVAL_UNBOUND_MARKER: | |
| 1211 return valcontents; | |
| 1212 | |
| 1213 default: | |
| 2500 | 1214 ABORT (); |
| 428 | 1215 } |
| 1216 return Qnil; /* suppress compiler warning */ | |
| 1217 } | |
| 1218 | |
| 1219 /* Set the value of default-buffer-local variable SYM to VALUE. */ | |
| 1220 | |
| 1221 static void | |
| 1222 set_default_buffer_slot_variable (Lisp_Object sym, | |
| 1223 Lisp_Object value) | |
| 1224 { | |
| 1225 /* Handle variables like case-fold-search that have special slots in | |
| 1226 the buffer. Make them work apparently like buffer_local variables. | |
| 1227 */ | |
| 1228 /* At this point, the value cell may not contain a symbol-value-varalias | |
| 1229 or symbol-value-buffer-local, and if there's a handler, we should | |
| 1230 have already called it. */ | |
| 1231 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt); | |
| 442 | 1232 const struct symbol_value_forward *fwd |
| 428 | 1233 = XSYMBOL_VALUE_FORWARD (valcontents); |
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1234 int offset = ((Rawbyte *) symbol_value_forward_forward (fwd) |
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1235 - (Rawbyte *) &buffer_local_flags); |
| 428 | 1236 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); |
| 1237 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object, | |
| 1238 int flags) = symbol_value_forward_magicfun (fwd); | |
| 1239 | |
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1240 *((Lisp_Object *) (offset + (Rawbyte *) XBUFFER (Vbuffer_defaults))) |
| 428 | 1241 = value; |
| 1242 | |
| 1243 if (mask > 0) /* Not always per-buffer */ | |
| 1244 { | |
| 1245 /* Set value in each buffer which hasn't shadowed the default */ | |
| 1246 LIST_LOOP_2 (elt, Vbuffer_alist) | |
| 1247 { | |
| 1248 struct buffer *b = XBUFFER (XCDR (elt)); | |
| 1249 if (!(b->local_var_flags & mask)) | |
| 1250 { | |
| 1251 if (magicfun) | |
| 771 | 1252 magicfun (sym, &value, wrap_buffer (b), 0); |
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1253 *((Lisp_Object *) (offset + (Rawbyte *) b)) = value; |
| 428 | 1254 } |
| 1255 } | |
| 1256 } | |
| 1257 } | |
| 1258 | |
| 1259 /* Set the value of default-console-local variable SYM to VALUE. */ | |
| 1260 | |
| 1261 static void | |
| 1262 set_default_console_slot_variable (Lisp_Object sym, | |
| 1263 Lisp_Object value) | |
| 1264 { | |
| 1265 /* Handle variables like case-fold-search that have special slots in | |
| 1266 the console. Make them work apparently like console_local variables. | |
| 1267 */ | |
| 1268 /* At this point, the value cell may not contain a symbol-value-varalias | |
| 1269 or symbol-value-buffer-local, and if there's a handler, we should | |
| 1270 have already called it. */ | |
| 1271 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt); | |
| 442 | 1272 const struct symbol_value_forward *fwd |
| 428 | 1273 = XSYMBOL_VALUE_FORWARD (valcontents); |
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1274 int offset = ((Rawbyte *) symbol_value_forward_forward (fwd) |
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1275 - (Rawbyte *) &console_local_flags); |
| 428 | 1276 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); |
| 1277 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object, | |
| 1278 int flags) = symbol_value_forward_magicfun (fwd); | |
| 1279 | |
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1280 *((Lisp_Object *) (offset + (Rawbyte *) XCONSOLE (Vconsole_defaults))) |
| 428 | 1281 = value; |
| 1282 | |
| 1283 if (mask > 0) /* Not always per-console */ | |
| 1284 { | |
| 1285 /* Set value in each console which hasn't shadowed the default */ | |
| 1286 LIST_LOOP_2 (console, Vconsole_list) | |
| 1287 { | |
| 1288 struct console *d = XCONSOLE (console); | |
| 1289 if (!(d->local_var_flags & mask)) | |
| 1290 { | |
| 1291 if (magicfun) | |
| 1292 magicfun (sym, &value, console, 0); | |
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1293 *((Lisp_Object *) (offset + (Rawbyte *) d)) = value; |
| 428 | 1294 } |
| 1295 } | |
| 1296 } | |
| 1297 } | |
| 1298 | |
| 1299 /* Store NEWVAL into SYM. | |
| 1300 | |
| 1301 SYM's value slot may *not* be types (5) or (6) above, | |
| 1302 i.e. no symbol-value-varalias objects. (You should have | |
| 1303 forwarded past all of these.) | |
| 1304 | |
| 1305 SYM should not be an unsettable symbol or a symbol with | |
| 1306 a magic `set-value' handler (unless you want to explicitly | |
| 1307 ignore this handler). | |
| 1308 | |
| 1309 OVALUE is the current value of SYM, but forwarded past any | |
| 1310 symbol-value-buffer-local and symbol-value-lisp-magic objects. | |
| 1311 (i.e. if SYM is a symbol-value-buffer-local, OVALUE should be | |
| 1312 the contents of its current-value cell.) NEWVAL may only be | |
| 1313 a simple value or Qunbound. If SYM is a symbol-value-buffer-local, | |
| 1314 this function will only modify its current-value cell, which should | |
| 1315 already be set up to point to the current buffer. | |
| 1316 */ | |
| 1317 | |
| 1318 static void | |
| 1319 store_symval_forwarding (Lisp_Object sym, Lisp_Object ovalue, | |
| 1320 Lisp_Object newval) | |
| 1321 { | |
| 1322 if (!SYMBOL_VALUE_MAGIC_P (ovalue) || UNBOUNDP (ovalue)) | |
| 1323 { | |
| 1324 Lisp_Object *store_pointer = value_slot_past_magic (sym); | |
| 1325 | |
| 1326 if (SYMBOL_VALUE_BUFFER_LOCAL_P (*store_pointer)) | |
| 1327 store_pointer = | |
| 1328 &XSYMBOL_VALUE_BUFFER_LOCAL (*store_pointer)->current_value; | |
| 1329 | |
| 1330 assert (UNBOUNDP (*store_pointer) | |
| 1331 || !SYMBOL_VALUE_MAGIC_P (*store_pointer)); | |
| 1332 *store_pointer = newval; | |
| 1333 } | |
| 1334 else | |
| 1335 { | |
| 442 | 1336 const struct symbol_value_forward *fwd = XSYMBOL_VALUE_FORWARD (ovalue); |
| 428 | 1337 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, |
| 1338 Lisp_Object in_object, int flags) | |
| 1339 = symbol_value_forward_magicfun (fwd); | |
| 1340 | |
| 1341 switch (XSYMBOL_VALUE_MAGIC_TYPE (ovalue)) | |
| 1342 { | |
| 1343 case SYMVAL_FIXNUM_FORWARD: | |
| 1344 CHECK_INT (newval); | |
| 1345 if (magicfun) | |
| 1346 magicfun (sym, &newval, Qnil, 0); | |
| 458 | 1347 *((Fixnum *) symbol_value_forward_forward (fwd)) = XINT (newval); |
| 428 | 1348 return; |
| 1349 | |
| 1350 case SYMVAL_BOOLEAN_FORWARD: | |
| 1351 if (magicfun) | |
| 1352 magicfun (sym, &newval, Qnil, 0); | |
| 1353 *((int *) symbol_value_forward_forward (fwd)) | |
| 1354 = !NILP (newval); | |
| 1355 return; | |
| 1356 | |
| 1357 case SYMVAL_OBJECT_FORWARD: | |
| 1358 if (magicfun) | |
| 1359 magicfun (sym, &newval, Qnil, 0); | |
| 1360 *((Lisp_Object *) symbol_value_forward_forward (fwd)) = newval; | |
| 1361 return; | |
| 1362 | |
| 1363 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 1364 set_default_buffer_slot_variable (sym, newval); | |
| 1365 return; | |
| 1366 | |
| 1367 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1368 if (magicfun) | |
| 771 | 1369 magicfun (sym, &newval, wrap_buffer (current_buffer), 0); |
|
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1370 *((Lisp_Object *) ((Rawbyte *) current_buffer |
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1371 + ((Rawbyte *) symbol_value_forward_forward (fwd) |
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1372 - (Rawbyte *) &buffer_local_flags))) |
| 428 | 1373 = newval; |
| 1374 return; | |
| 1375 | |
| 1376 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 1377 set_default_console_slot_variable (sym, newval); | |
| 1378 return; | |
| 1379 | |
| 1380 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1381 if (magicfun) | |
| 1382 magicfun (sym, &newval, Vselected_console, 0); | |
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1383 *((Lisp_Object *) ((Rawbyte *) XCONSOLE (Vselected_console) |
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1384 + ((Rawbyte *) symbol_value_forward_forward (fwd) |
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1385 - (Rawbyte *) &console_local_flags))) |
| 428 | 1386 = newval; |
| 1387 return; | |
| 1388 | |
| 1389 default: | |
| 2500 | 1390 ABORT (); |
| 428 | 1391 } |
| 1392 } | |
| 1393 } | |
| 1394 | |
| 1395 /* Given a per-buffer variable SYMBOL and its raw value-cell contents | |
| 1396 BFWD, locate and return a pointer to the element in BUFFER's | |
| 1397 local_var_alist for SYMBOL. The return value will be Qnil if | |
| 1398 BUFFER does not have its own value for SYMBOL (i.e. the default | |
| 1399 value is seen in that buffer). | |
| 1400 */ | |
| 1401 | |
| 1402 static Lisp_Object | |
| 1403 buffer_local_alist_element (struct buffer *buffer, Lisp_Object symbol, | |
| 1404 struct symbol_value_buffer_local *bfwd) | |
| 1405 { | |
| 1406 if (!NILP (bfwd->current_buffer) && | |
| 1407 XBUFFER (bfwd->current_buffer) == buffer) | |
| 1408 /* This is just an optimization of the below. */ | |
| 1409 return bfwd->current_alist_element; | |
| 1410 else | |
| 1411 return assq_no_quit (symbol, buffer->local_var_alist); | |
| 1412 } | |
| 1413 | |
| 1414 /* [Remember that the slot that mirrors CURRENT-VALUE in the | |
| 1415 symbol-value-buffer-local of a per-buffer variable -- i.e. the | |
| 1416 slot in CURRENT-BUFFER's local_var_alist, or the DEFAULT-VALUE | |
| 1417 slot -- may be out of date.] | |
| 1418 | |
| 1419 Write out any cached value in buffer-local variable SYMBOL's | |
| 1420 buffer-local structure, which is passed in as BFWD. | |
| 1421 */ | |
| 1422 | |
| 1423 static void | |
| 2286 | 1424 write_out_buffer_local_cache (Lisp_Object UNUSED (symbol), |
| 428 | 1425 struct symbol_value_buffer_local *bfwd) |
| 1426 { | |
| 1427 if (!NILP (bfwd->current_buffer)) | |
| 1428 { | |
| 1429 /* We pass 0 for BUFFER because only SYMVAL_CURRENT_BUFFER_FORWARD | |
| 1430 uses it, and that type cannot be inside a symbol-value-buffer-local */ | |
| 1431 Lisp_Object cval = do_symval_forwarding (bfwd->current_value, 0, 0); | |
| 1432 if (NILP (bfwd->current_alist_element)) | |
| 1433 /* current_value may be updated more recently than default_value */ | |
| 1434 bfwd->default_value = cval; | |
| 1435 else | |
| 1436 Fsetcdr (bfwd->current_alist_element, cval); | |
| 1437 } | |
| 1438 } | |
| 1439 | |
| 1440 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure. | |
| 1441 Set up BFWD's cache for validity in buffer BUF. This assumes that | |
| 1442 the cache is currently in a consistent state (this can include | |
| 1443 not having any value cached, if BFWD->CURRENT_BUFFER is nil). | |
| 1444 | |
| 1445 If the cache is already set up for BUF, this function does nothing | |
| 1446 at all. | |
| 1447 | |
| 1448 Otherwise, if SYM forwards out to a C variable, this also forwards | |
| 1449 SYM's value in BUF out to the variable. Therefore, you generally | |
| 1450 only want to call this when BUF is, or is about to become, the | |
| 1451 current buffer. | |
| 1452 | |
| 1453 (Otherwise, you can just retrieve the value without changing the | |
| 1454 cache, at the expense of slower retrieval.) | |
| 1455 */ | |
| 1456 | |
| 1457 static void | |
| 1458 set_up_buffer_local_cache (Lisp_Object sym, | |
| 1459 struct symbol_value_buffer_local *bfwd, | |
| 1460 struct buffer *buf, | |
| 1461 Lisp_Object new_alist_el, | |
| 1462 int set_it_p) | |
| 1463 { | |
| 1464 Lisp_Object new_val; | |
| 1465 | |
| 1466 if (!NILP (bfwd->current_buffer) | |
| 1467 && buf == XBUFFER (bfwd->current_buffer)) | |
| 1468 /* Cache is already set up. */ | |
| 1469 return; | |
| 1470 | |
| 1471 /* Flush out the old cache. */ | |
| 1472 write_out_buffer_local_cache (sym, bfwd); | |
| 1473 | |
| 1474 /* Retrieve the new alist element and new value. */ | |
| 1475 if (NILP (new_alist_el) | |
| 1476 && set_it_p) | |
| 1477 new_alist_el = buffer_local_alist_element (buf, sym, bfwd); | |
| 1478 | |
| 1479 if (NILP (new_alist_el)) | |
| 1480 new_val = bfwd->default_value; | |
| 1481 else | |
| 1482 new_val = Fcdr (new_alist_el); | |
| 1483 | |
| 1484 bfwd->current_alist_element = new_alist_el; | |
| 793 | 1485 bfwd->current_buffer = wrap_buffer (buf); |
| 428 | 1486 |
| 1487 /* Now store the value into the current-value slot. | |
| 1488 We don't simply write it there, because the current-value | |
| 1489 slot might be a forwarding pointer, in which case we need | |
| 1490 to instead write the value into the C variable. | |
| 1491 | |
| 1492 We might also want to call a magic function. | |
| 1493 | |
| 1494 So instead, we call this function. */ | |
| 1495 store_symval_forwarding (sym, bfwd->current_value, new_val); | |
| 1496 } | |
| 1497 | |
| 446 | 1498 |
| 1499 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure. | |
| 1500 Flush the cache. BFWD->CURRENT_BUFFER will be nil after this operation. | |
| 1501 */ | |
| 1502 | |
| 1503 static void | |
| 1504 flush_buffer_local_cache (Lisp_Object sym, | |
| 1505 struct symbol_value_buffer_local *bfwd) | |
| 1506 { | |
| 1507 if (NILP (bfwd->current_buffer)) | |
| 1508 /* Cache is already flushed. */ | |
| 1509 return; | |
| 1510 | |
| 1511 /* Flush out the old cache. */ | |
| 1512 write_out_buffer_local_cache (sym, bfwd); | |
| 1513 | |
| 1514 bfwd->current_alist_element = Qnil; | |
| 1515 bfwd->current_buffer = Qnil; | |
| 1516 | |
| 1517 /* Now store default the value into the current-value slot. | |
| 1518 We don't simply write it there, because the current-value | |
| 1519 slot might be a forwarding pointer, in which case we need | |
| 1520 to instead write the value into the C variable. | |
| 1521 | |
| 1522 We might also want to call a magic function. | |
| 1523 | |
| 1524 So instead, we call this function. */ | |
| 1525 store_symval_forwarding (sym, bfwd->current_value, bfwd->default_value); | |
| 1526 } | |
| 1527 | |
| 1528 /* Flush all the buffer-local variable caches. Whoever has a | |
| 1529 non-interned buffer-local variable will be spanked. Whoever has a | |
| 1530 magic variable that interns or uninterns symbols... I don't even | |
| 1531 want to think about it. | |
| 1532 */ | |
| 1533 | |
| 1534 void | |
| 1535 flush_all_buffer_local_cache (void) | |
| 1536 { | |
| 1537 Lisp_Object *syms = XVECTOR_DATA (Vobarray); | |
| 1538 long count = XVECTOR_LENGTH (Vobarray); | |
| 1539 long i; | |
| 1540 | |
| 1541 for (i=0; i<count; i++) | |
| 1542 { | |
| 1543 Lisp_Object sym = syms[i]; | |
| 1544 Lisp_Object value; | |
| 1545 | |
| 1546 if (!ZEROP (sym)) | |
| 1547 for(;;) | |
| 1548 { | |
| 1549 Lisp_Symbol *next; | |
| 1550 assert (SYMBOLP (sym)); | |
| 1551 value = fetch_value_maybe_past_magic (sym, Qt); | |
| 1552 if (SYMBOL_VALUE_BUFFER_LOCAL_P (value)) | |
| 1553 flush_buffer_local_cache (sym, XSYMBOL_VALUE_BUFFER_LOCAL (value)); | |
| 1554 | |
| 1555 next = symbol_next (XSYMBOL (sym)); | |
| 1556 if (!next) | |
| 1557 break; | |
| 793 | 1558 sym = wrap_symbol (next); |
| 446 | 1559 } |
| 1560 } | |
| 1561 } | |
| 1562 | |
| 428 | 1563 |
| 1564 void | |
| 1565 kill_buffer_local_variables (struct buffer *buf) | |
| 1566 { | |
| 1567 Lisp_Object prev = Qnil; | |
| 1568 Lisp_Object alist; | |
| 1569 | |
| 1570 /* Any which are supposed to be permanent, | |
| 1571 make local again, with the same values they had. */ | |
| 1572 | |
| 1573 for (alist = buf->local_var_alist; !NILP (alist); alist = XCDR (alist)) | |
| 1574 { | |
| 1575 Lisp_Object sym = XCAR (XCAR (alist)); | |
| 1576 struct symbol_value_buffer_local *bfwd; | |
| 1577 /* Variables with a symbol-value-varalias should not be here | |
| 1578 (we should have forwarded past them) and there must be a | |
| 1579 symbol-value-buffer-local. If there's a symbol-value-lisp-magic, | |
| 1580 just forward past it; if the variable has a handler, it was | |
| 1581 already called. */ | |
| 1582 Lisp_Object value = fetch_value_maybe_past_magic (sym, Qt); | |
| 1583 | |
| 1584 assert (SYMBOL_VALUE_BUFFER_LOCAL_P (value)); | |
| 1585 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (value); | |
| 1586 | |
| 1587 if (!NILP (Fget (sym, Qpermanent_local, Qnil))) | |
| 1588 /* prev points to the last alist element that is still | |
| 1589 staying around, so *only* update it now. This didn't | |
| 1590 used to be the case; this bug has been around since | |
| 1591 mly's rewrite two years ago! */ | |
| 1592 prev = alist; | |
| 1593 else | |
| 1594 { | |
| 1595 /* Really truly kill it. */ | |
| 1596 if (!NILP (prev)) | |
| 1597 XCDR (prev) = XCDR (alist); | |
| 1598 else | |
| 1599 buf->local_var_alist = XCDR (alist); | |
| 1600 | |
| 1601 /* We just effectively changed the value for this variable | |
| 1602 in BUF. So: */ | |
| 1603 | |
| 1604 /* (1) If the cache is caching BUF, invalidate the cache. */ | |
| 1605 if (!NILP (bfwd->current_buffer) && | |
| 1606 buf == XBUFFER (bfwd->current_buffer)) | |
| 1607 bfwd->current_buffer = Qnil; | |
| 1608 | |
| 1609 /* (2) If we changed the value in current_buffer and this | |
| 1610 variable forwards to a C variable, we need to change the | |
| 1611 value of the C variable. set_up_buffer_local_cache() | |
| 1612 will do this. It doesn't hurt to do it whenever | |
| 1613 BUF == current_buffer, so just go ahead and do that. */ | |
| 1614 if (buf == current_buffer) | |
| 1615 set_up_buffer_local_cache (sym, bfwd, buf, Qnil, 0); | |
| 1616 } | |
| 1617 } | |
| 1618 } | |
| 1619 | |
| 1620 static Lisp_Object | |
| 1621 find_symbol_value_1 (Lisp_Object sym, struct buffer *buf, | |
| 1622 struct console *con, int swap_it_in, | |
| 1623 Lisp_Object symcons, int set_it_p) | |
| 1624 { | |
| 1625 Lisp_Object valcontents; | |
| 1626 | |
| 1627 retry: | |
| 1628 valcontents = XSYMBOL (sym)->value; | |
| 1629 | |
| 1630 retry_2: | |
| 1631 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1632 return valcontents; | |
| 1633 | |
| 1634 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 1635 { | |
| 1636 case SYMVAL_LISP_MAGIC: | |
| 1637 /* #### kludge */ | |
| 1638 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 1639 /* semi-change-o */ | |
| 1640 goto retry_2; | |
| 1641 | |
| 1642 case SYMVAL_VARALIAS: | |
| 1643 sym = follow_varalias_pointers (sym, Qt /* #### kludge */); | |
| 1644 symcons = Qnil; | |
| 1645 /* presto change-o! */ | |
| 1646 goto retry; | |
| 1647 | |
| 1648 case SYMVAL_BUFFER_LOCAL: | |
| 1649 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 1650 { | |
| 1651 struct symbol_value_buffer_local *bfwd | |
| 1652 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 1653 | |
| 1654 if (swap_it_in) | |
| 1655 { | |
| 1656 set_up_buffer_local_cache (sym, bfwd, buf, symcons, set_it_p); | |
| 1657 valcontents = bfwd->current_value; | |
| 1658 } | |
| 1659 else | |
| 1660 { | |
| 1661 if (!NILP (bfwd->current_buffer) && | |
| 1662 buf == XBUFFER (bfwd->current_buffer)) | |
| 1663 valcontents = bfwd->current_value; | |
| 1664 else if (NILP (symcons)) | |
| 1665 { | |
| 1666 if (set_it_p) | |
| 1667 valcontents = assq_no_quit (sym, buf->local_var_alist); | |
| 1668 if (NILP (valcontents)) | |
| 1669 valcontents = bfwd->default_value; | |
| 1670 else | |
| 1671 valcontents = XCDR (valcontents); | |
| 1672 } | |
| 1673 else | |
| 1674 valcontents = XCDR (symcons); | |
| 1675 } | |
| 1676 break; | |
| 1677 } | |
| 1678 | |
| 1679 default: | |
| 1680 break; | |
| 1681 } | |
| 1682 return do_symval_forwarding (valcontents, buf, con); | |
| 1683 } | |
| 1684 | |
| 1685 | |
| 1686 /* Find the value of a symbol in BUFFER, returning Qunbound if it's not | |
| 1687 bound. Note that it must not be possible to QUIT within this | |
| 1688 function. */ | |
| 1689 | |
| 1690 Lisp_Object | |
| 1691 symbol_value_in_buffer (Lisp_Object sym, Lisp_Object buffer) | |
| 1692 { | |
| 1693 struct buffer *buf; | |
| 1694 | |
| 1695 CHECK_SYMBOL (sym); | |
| 1696 | |
| 1697 if (NILP (buffer)) | |
| 1698 buf = current_buffer; | |
| 1699 else | |
| 1700 { | |
| 1701 CHECK_BUFFER (buffer); | |
| 1702 buf = XBUFFER (buffer); | |
| 1703 } | |
| 1704 | |
| 1705 return find_symbol_value_1 (sym, buf, | |
| 1706 /* If it bombs out at startup due to a | |
| 1707 Lisp error, this may be nil. */ | |
| 1708 CONSOLEP (Vselected_console) | |
| 1709 ? XCONSOLE (Vselected_console) : 0, 0, Qnil, 1); | |
| 1710 } | |
| 1711 | |
| 1712 static Lisp_Object | |
| 1713 symbol_value_in_console (Lisp_Object sym, Lisp_Object console) | |
| 1714 { | |
| 1715 CHECK_SYMBOL (sym); | |
| 1716 | |
| 1717 if (NILP (console)) | |
| 1718 console = Vselected_console; | |
| 1719 else | |
| 1720 CHECK_CONSOLE (console); | |
| 1721 | |
| 1722 return find_symbol_value_1 (sym, current_buffer, XCONSOLE (console), 0, | |
| 1723 Qnil, 1); | |
| 1724 } | |
| 1725 | |
| 1726 /* Return the current value of SYM. The difference between this function | |
| 1727 and calling symbol_value_in_buffer with a BUFFER of Qnil is that | |
| 1728 this updates the CURRENT_VALUE slot of buffer-local variables to | |
| 1729 point to the current buffer, while symbol_value_in_buffer doesn't. */ | |
| 1730 | |
| 1731 Lisp_Object | |
| 1732 find_symbol_value (Lisp_Object sym) | |
| 1733 { | |
| 1734 /* WARNING: This function can be called when current_buffer is 0 | |
| 1735 and Vselected_console is Qnil, early in initialization. */ | |
| 1736 struct console *con; | |
| 1737 Lisp_Object valcontents; | |
| 1738 | |
| 1739 CHECK_SYMBOL (sym); | |
| 1740 | |
| 1741 valcontents = XSYMBOL (sym)->value; | |
| 1742 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 1743 return valcontents; | |
| 1744 | |
| 1745 if (CONSOLEP (Vselected_console)) | |
| 1746 con = XCONSOLE (Vselected_console); | |
| 1747 else | |
| 1748 { | |
| 1749 /* This can also get called while we're preparing to shutdown. | |
| 1750 #### What should really happen in that case? Should we | |
| 1751 actually fix things so we can't get here in that case? */ | |
| 1752 #ifndef PDUMP | |
| 1753 assert (!initialized || preparing_for_armageddon); | |
| 1754 #endif | |
| 1755 con = 0; | |
| 1756 } | |
| 1757 | |
| 1758 return find_symbol_value_1 (sym, current_buffer, con, 1, Qnil, 1); | |
| 1759 } | |
| 1760 | |
| 1761 /* This is an optimized function for quick lookup of buffer local symbols | |
| 1762 by avoiding O(n) search. This will work when either: | |
| 1763 a) We have already found the symbol e.g. by traversing local_var_alist. | |
| 1764 or | |
| 1765 b) We know that the symbol will not be found in the current buffer's | |
| 1766 list of local variables. | |
| 1767 In the former case, find_it_p is 1 and symbol_cons is the element from | |
| 1768 local_var_alist. In the latter case, find_it_p is 0 and symbol_cons | |
| 1769 is the symbol. | |
| 1770 | |
| 1771 This function is called from set_buffer_internal which does both of these | |
| 1772 things. */ | |
| 1773 | |
| 1774 Lisp_Object | |
| 1775 find_symbol_value_quickly (Lisp_Object symbol_cons, int find_it_p) | |
| 1776 { | |
| 1777 /* WARNING: This function can be called when current_buffer is 0 | |
| 1778 and Vselected_console is Qnil, early in initialization. */ | |
| 1779 struct console *con; | |
| 1780 Lisp_Object sym = find_it_p ? XCAR (symbol_cons) : symbol_cons; | |
| 1781 | |
| 1782 CHECK_SYMBOL (sym); | |
| 1783 if (CONSOLEP (Vselected_console)) | |
| 1784 con = XCONSOLE (Vselected_console); | |
| 1785 else | |
| 1786 { | |
| 1787 /* This can also get called while we're preparing to shutdown. | |
| 1788 #### What should really happen in that case? Should we | |
| 1789 actually fix things so we can't get here in that case? */ | |
| 1790 #ifndef PDUMP | |
| 1791 assert (!initialized || preparing_for_armageddon); | |
| 1792 #endif | |
| 1793 con = 0; | |
| 1794 } | |
| 1795 | |
| 1796 return find_symbol_value_1 (sym, current_buffer, con, 1, | |
| 1797 find_it_p ? symbol_cons : Qnil, | |
| 1798 find_it_p); | |
| 1799 } | |
| 1800 | |
| 1801 DEFUN ("symbol-value", Fsymbol_value, 1, 1, 0, /* | |
| 1802 Return SYMBOL's value. Error if that is void. | |
| 1803 */ | |
| 1804 (symbol)) | |
| 1805 { | |
| 1806 Lisp_Object val = find_symbol_value (symbol); | |
| 1807 | |
| 1808 if (UNBOUNDP (val)) | |
| 1809 return Fsignal (Qvoid_variable, list1 (symbol)); | |
| 1810 else | |
| 1811 return val; | |
| 1812 } | |
| 1813 | |
| 1814 DEFUN ("set", Fset, 2, 2, 0, /* | |
| 1815 Set SYMBOL's value to NEWVAL, and return NEWVAL. | |
| 1816 */ | |
| 1817 (symbol, newval)) | |
| 1818 { | |
| 1819 REGISTER Lisp_Object valcontents; | |
| 440 | 1820 Lisp_Symbol *sym; |
| 428 | 1821 /* remember, we're called by Fmakunbound() as well */ |
| 1822 | |
| 1823 CHECK_SYMBOL (symbol); | |
| 1824 | |
| 1825 retry: | |
| 1826 sym = XSYMBOL (symbol); | |
| 1827 valcontents = sym->value; | |
| 1828 | |
| 1829 if (EQ (symbol, Qnil) || | |
| 1830 EQ (symbol, Qt) || | |
| 1831 SYMBOL_IS_KEYWORD (symbol)) | |
| 1832 reject_constant_symbols (symbol, newval, 0, | |
| 1833 UNBOUNDP (newval) ? Qmakunbound : Qset); | |
| 1834 | |
| 1835 if (!SYMBOL_VALUE_MAGIC_P (valcontents) || UNBOUNDP (valcontents)) | |
| 1836 { | |
| 1837 sym->value = newval; | |
| 1838 return newval; | |
| 1839 } | |
| 1840 | |
| 1841 reject_constant_symbols (symbol, newval, 0, | |
| 1842 UNBOUNDP (newval) ? Qmakunbound : Qset); | |
| 1843 | |
| 1844 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 1845 { | |
| 1846 case SYMVAL_LISP_MAGIC: | |
| 1847 { | |
| 1848 if (UNBOUNDP (newval)) | |
| 440 | 1849 { |
| 1850 maybe_call_magic_handler (symbol, Qmakunbound, 0); | |
| 1851 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = Qunbound; | |
| 1852 } | |
| 428 | 1853 else |
| 440 | 1854 { |
| 1855 maybe_call_magic_handler (symbol, Qset, 1, newval); | |
| 1856 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = newval; | |
| 1857 } | |
| 428 | 1858 } |
| 1859 | |
| 1860 case SYMVAL_VARALIAS: | |
| 1861 symbol = follow_varalias_pointers (symbol, | |
| 1862 UNBOUNDP (newval) | |
| 1863 ? Qmakunbound : Qset); | |
| 1864 /* presto change-o! */ | |
| 1865 goto retry; | |
| 1866 | |
| 1867 case SYMVAL_FIXNUM_FORWARD: | |
| 996 | 1868 case SYMVAL_CONST_FIXNUM_FORWARD: |
| 428 | 1869 case SYMVAL_BOOLEAN_FORWARD: |
| 996 | 1870 case SYMVAL_CONST_BOOLEAN_FORWARD: |
| 428 | 1871 case SYMVAL_DEFAULT_BUFFER_FORWARD: |
| 1872 case SYMVAL_DEFAULT_CONSOLE_FORWARD: | |
| 1873 if (UNBOUNDP (newval)) | |
| 996 | 1874 { |
| 1875 #ifdef HAVE_SHLIB | |
| 1876 if (unloading_module) | |
| 1877 { | |
| 1878 sym->value = newval; | |
| 1879 return newval; | |
| 1880 } | |
| 1881 else | |
| 1882 #endif | |
| 1883 invalid_change ("Cannot makunbound", symbol); | |
| 1884 } | |
| 1885 break; | |
| 1886 | |
| 1887 case SYMVAL_OBJECT_FORWARD: | |
| 1888 case SYMVAL_CONST_OBJECT_FORWARD: | |
| 1889 if (UNBOUNDP (newval)) | |
| 1890 { | |
| 1891 #ifdef HAVE_SHLIB | |
| 1892 if (unloading_module) | |
| 1893 { | |
| 1111 | 1894 unstaticpro_nodump ((Lisp_Object *) |
| 1895 symbol_value_forward_forward | |
| 996 | 1896 (XSYMBOL_VALUE_FORWARD (valcontents))); |
| 1897 sym->value = newval; | |
| 1898 return newval; | |
| 1899 } | |
| 1900 else | |
| 1901 #endif | |
| 1902 invalid_change ("Cannot makunbound", symbol); | |
| 1903 } | |
| 428 | 1904 break; |
| 1905 | |
| 1906 /* case SYMVAL_UNBOUND_MARKER: break; */ | |
| 1907 | |
| 1908 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 1909 { | |
| 442 | 1910 const struct symbol_value_forward *fwd |
| 428 | 1911 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1912 int mask = XINT (*((Lisp_Object *) | |
| 1913 symbol_value_forward_forward (fwd))); | |
| 1914 if (mask > 0) | |
| 1915 /* Setting this variable makes it buffer-local */ | |
| 1916 current_buffer->local_var_flags |= mask; | |
| 1917 break; | |
| 1918 } | |
| 1919 | |
| 1920 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 1921 { | |
| 442 | 1922 const struct symbol_value_forward *fwd |
| 428 | 1923 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 1924 int mask = XINT (*((Lisp_Object *) | |
| 1925 symbol_value_forward_forward (fwd))); | |
| 1926 if (mask > 0) | |
| 1927 /* Setting this variable makes it console-local */ | |
| 1928 XCONSOLE (Vselected_console)->local_var_flags |= mask; | |
| 1929 break; | |
| 1930 } | |
| 1931 | |
| 1932 case SYMVAL_BUFFER_LOCAL: | |
| 1933 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 1934 { | |
| 1935 /* If we want to examine or set the value and | |
| 1936 CURRENT-BUFFER is current, we just examine or set | |
| 1937 CURRENT-VALUE. If CURRENT-BUFFER is not current, we | |
| 1938 store the current CURRENT-VALUE value into | |
| 1939 CURRENT-ALIST- ELEMENT, then find the appropriate alist | |
| 1940 element for the buffer now current and set up | |
| 1941 CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE out | |
| 1942 of that element, and store into CURRENT-BUFFER. | |
| 1943 | |
| 1944 If we are setting the variable and the current buffer does | |
| 1945 not have an alist entry for this variable, an alist entry is | |
| 1946 created. | |
| 1947 | |
| 1948 Note that CURRENT-VALUE can be a forwarding pointer. | |
| 1949 Each time it is examined or set, forwarding must be | |
| 1950 done. */ | |
| 1951 struct symbol_value_buffer_local *bfwd | |
| 1952 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 1953 int some_buffer_local_p = | |
| 1954 (bfwd->magic.type == SYMVAL_SOME_BUFFER_LOCAL); | |
| 1955 /* What value are we caching right now? */ | |
| 1956 Lisp_Object aelt = bfwd->current_alist_element; | |
| 1957 | |
| 1958 if (!NILP (bfwd->current_buffer) && | |
| 1959 current_buffer == XBUFFER (bfwd->current_buffer) | |
| 1960 && ((some_buffer_local_p) | |
| 1961 ? 1 /* doesn't automatically become local */ | |
| 1962 : !NILP (aelt) /* already local */ | |
| 1963 )) | |
| 1964 { | |
| 1965 /* Cache is valid */ | |
| 1966 valcontents = bfwd->current_value; | |
| 1967 } | |
| 1968 else | |
| 1969 { | |
| 1970 /* If the current buffer is not the buffer whose binding is | |
| 1971 currently cached, or if it's a SYMVAL_BUFFER_LOCAL and | |
| 1972 we're looking at the default value, the cache is invalid; we | |
| 1973 need to write it out, and find the new CURRENT-ALIST-ELEMENT | |
| 1974 */ | |
| 1975 | |
| 1976 /* Write out the cached value for the old buffer; copy it | |
| 1977 back to its alist element. This works if the current | |
| 1978 buffer only sees the default value, too. */ | |
| 1979 write_out_buffer_local_cache (symbol, bfwd); | |
| 1980 | |
| 1981 /* Find the new value for CURRENT-ALIST-ELEMENT. */ | |
| 1982 aelt = buffer_local_alist_element (current_buffer, symbol, bfwd); | |
| 1983 if (NILP (aelt)) | |
| 1984 { | |
| 1985 /* This buffer is still seeing the default value. */ | |
| 1986 if (!some_buffer_local_p) | |
| 1987 { | |
| 1988 /* If it's a SYMVAL_BUFFER_LOCAL, give this buffer a | |
| 1989 new assoc for a local value and set | |
| 1990 CURRENT-ALIST-ELEMENT to point to that. */ | |
| 1991 aelt = | |
| 1992 do_symval_forwarding (bfwd->current_value, | |
| 1993 current_buffer, | |
| 1994 XCONSOLE (Vselected_console)); | |
| 1995 aelt = Fcons (symbol, aelt); | |
| 1996 current_buffer->local_var_alist | |
| 1997 = Fcons (aelt, current_buffer->local_var_alist); | |
| 1998 } | |
| 1999 else | |
| 2000 { | |
| 2001 /* If the variable is a SYMVAL_SOME_BUFFER_LOCAL, | |
| 2002 we're currently seeing the default value. */ | |
| 2003 ; | |
| 2004 } | |
| 2005 } | |
| 2006 /* Cache the new buffer's assoc in CURRENT-ALIST-ELEMENT. */ | |
| 2007 bfwd->current_alist_element = aelt; | |
| 2008 /* Set BUFFER, now that CURRENT-ALIST-ELEMENT is accurate. */ | |
| 793 | 2009 bfwd->current_buffer = wrap_buffer (current_buffer); |
| 428 | 2010 valcontents = bfwd->current_value; |
| 2011 } | |
| 2012 break; | |
| 2013 } | |
| 2014 default: | |
| 2500 | 2015 ABORT (); |
| 428 | 2016 } |
| 2017 store_symval_forwarding (symbol, valcontents, newval); | |
| 2018 | |
| 2019 return newval; | |
| 2020 } | |
| 2021 | |
| 2022 | |
| 2023 /* Access or set a buffer-local symbol's default value. */ | |
| 2024 | |
| 2025 /* Return the default value of SYM, but don't check for voidness. | |
| 2026 Return Qunbound if it is void. */ | |
| 2027 | |
| 2028 static Lisp_Object | |
| 2029 default_value (Lisp_Object sym) | |
| 2030 { | |
| 2031 Lisp_Object valcontents; | |
| 2032 | |
| 2033 CHECK_SYMBOL (sym); | |
| 2034 | |
| 2035 retry: | |
| 2036 valcontents = XSYMBOL (sym)->value; | |
| 2037 | |
| 2038 retry_2: | |
| 2039 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2040 return valcontents; | |
| 2041 | |
| 2042 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2043 { | |
| 2044 case SYMVAL_LISP_MAGIC: | |
| 2045 /* #### kludge */ | |
| 2046 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2047 /* semi-change-o */ | |
| 2048 goto retry_2; | |
| 2049 | |
| 2050 case SYMVAL_VARALIAS: | |
| 2051 sym = follow_varalias_pointers (sym, Qt /* #### kludge */); | |
| 2052 /* presto change-o! */ | |
| 2053 goto retry; | |
| 2054 | |
| 2055 case SYMVAL_UNBOUND_MARKER: | |
| 2056 return valcontents; | |
| 2057 | |
| 2058 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2059 { | |
| 442 | 2060 const struct symbol_value_forward *fwd |
| 428 | 2061 = XSYMBOL_VALUE_FORWARD (valcontents); |
|
4952
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Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2062 return (*((Lisp_Object *)((Rawbyte *) XBUFFER (Vbuffer_defaults) |
|
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4940
diff
changeset
|
2063 + ((Rawbyte *)symbol_value_forward_forward (fwd) |
|
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4940
diff
changeset
|
2064 - (Rawbyte *)&buffer_local_flags)))); |
| 428 | 2065 } |
| 2066 | |
| 2067 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 2068 { | |
| 442 | 2069 const struct symbol_value_forward *fwd |
| 428 | 2070 = XSYMBOL_VALUE_FORWARD (valcontents); |
|
4952
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Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2071 return (*((Lisp_Object *)((Rawbyte *) XCONSOLE (Vconsole_defaults) |
|
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4940
diff
changeset
|
2072 + ((Rawbyte *)symbol_value_forward_forward (fwd) |
|
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4940
diff
changeset
|
2073 - (Rawbyte *)&console_local_flags)))); |
| 428 | 2074 } |
| 2075 | |
| 2076 case SYMVAL_BUFFER_LOCAL: | |
| 2077 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2078 { | |
| 2079 struct symbol_value_buffer_local *bfwd = | |
| 2080 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2081 | |
| 2082 /* Handle user-created local variables. */ | |
| 2083 /* If var is set up for a buffer that lacks a local value for it, | |
| 2084 the current value is nominally the default value. | |
| 2085 But the current value slot may be more up to date, since | |
| 2086 ordinary setq stores just that slot. So use that. */ | |
| 2087 if (NILP (bfwd->current_alist_element)) | |
| 2088 return do_symval_forwarding (bfwd->current_value, current_buffer, | |
| 2089 XCONSOLE (Vselected_console)); | |
| 2090 else | |
| 2091 return bfwd->default_value; | |
| 2092 } | |
| 2093 default: | |
| 2094 /* For other variables, get the current value. */ | |
| 2095 return do_symval_forwarding (valcontents, current_buffer, | |
| 2096 XCONSOLE (Vselected_console)); | |
| 2097 } | |
| 2098 | |
| 1204 | 2099 RETURN_NOT_REACHED (Qnil); /* suppress compiler warning */ |
| 428 | 2100 } |
| 2101 | |
| 2102 DEFUN ("default-boundp", Fdefault_boundp, 1, 1, 0, /* | |
| 2103 Return t if SYMBOL has a non-void default value. | |
| 2104 This is the value that is seen in buffers that do not have their own values | |
| 2105 for this variable. | |
| 2106 */ | |
| 2107 (symbol)) | |
| 2108 { | |
| 2109 return UNBOUNDP (default_value (symbol)) ? Qnil : Qt; | |
| 2110 } | |
| 2111 | |
| 2112 DEFUN ("default-value", Fdefault_value, 1, 1, 0, /* | |
| 2113 Return SYMBOL's default value. | |
| 2114 This is the value that is seen in buffers that do not have their own values | |
| 2115 for this variable. The default value is meaningful for variables with | |
| 2116 local bindings in certain buffers. | |
| 2117 */ | |
| 2118 (symbol)) | |
| 2119 { | |
| 2120 Lisp_Object value = default_value (symbol); | |
| 2121 | |
| 2122 return UNBOUNDP (value) ? Fsignal (Qvoid_variable, list1 (symbol)) : value; | |
| 2123 } | |
| 2124 | |
| 2125 DEFUN ("set-default", Fset_default, 2, 2, 0, /* | |
| 444 | 2126 Set SYMBOL's default value to VALUE. SYMBOL and VALUE are evaluated. |
| 428 | 2127 The default value is seen in buffers that do not have their own values |
| 2128 for this variable. | |
| 2129 */ | |
| 2130 (symbol, value)) | |
| 2131 { | |
| 2132 Lisp_Object valcontents; | |
| 2133 | |
| 2134 CHECK_SYMBOL (symbol); | |
| 2135 | |
| 2136 retry: | |
| 2137 valcontents = XSYMBOL (symbol)->value; | |
| 2138 | |
| 2139 retry_2: | |
| 2140 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2141 return Fset (symbol, value); | |
| 2142 | |
| 2143 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2144 { | |
| 2145 case SYMVAL_LISP_MAGIC: | |
| 2146 RETURN_IF_NOT_UNBOUND (maybe_call_magic_handler (symbol, Qset_default, 1, | |
| 2147 value)); | |
| 2148 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2149 /* semi-change-o */ | |
| 2150 goto retry_2; | |
| 2151 | |
| 2152 case SYMVAL_VARALIAS: | |
| 2153 symbol = follow_varalias_pointers (symbol, Qset_default); | |
| 2154 /* presto change-o! */ | |
| 2155 goto retry; | |
| 2156 | |
| 2157 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2158 set_default_buffer_slot_variable (symbol, value); | |
| 2159 return value; | |
| 2160 | |
| 2161 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 2162 set_default_console_slot_variable (symbol, value); | |
| 2163 return value; | |
| 2164 | |
| 2165 case SYMVAL_BUFFER_LOCAL: | |
| 2166 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2167 { | |
| 2168 /* Store new value into the DEFAULT-VALUE slot */ | |
| 2169 struct symbol_value_buffer_local *bfwd | |
| 2170 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2171 | |
| 2172 bfwd->default_value = value; | |
| 2173 /* If current-buffer doesn't shadow default_value, | |
| 2174 * we must set the CURRENT-VALUE slot too */ | |
| 2175 if (NILP (bfwd->current_alist_element)) | |
| 2176 store_symval_forwarding (symbol, bfwd->current_value, value); | |
| 2177 return value; | |
| 2178 } | |
| 2179 | |
| 2180 default: | |
| 2181 return Fset (symbol, value); | |
| 2182 } | |
| 2183 } | |
| 2184 | |
| 2185 DEFUN ("setq-default", Fsetq_default, 0, UNEVALLED, 0, /* | |
| 2186 Set the default value of variable SYMBOL to VALUE. | |
| 2187 SYMBOL, the variable name, is literal (not evaluated); | |
| 2188 VALUE is an expression and it is evaluated. | |
| 2189 The default value of a variable is seen in buffers | |
| 2190 that do not have their own values for the variable. | |
| 2191 | |
| 2192 More generally, you can use multiple variables and values, as in | |
| 2193 (setq-default SYMBOL VALUE SYMBOL VALUE...) | |
| 2194 This sets each SYMBOL's default value to the corresponding VALUE. | |
| 2195 The VALUE for the Nth SYMBOL can refer to the new default values | |
| 2196 of previous SYMBOLs. | |
| 2197 */ | |
| 2198 (args)) | |
| 2199 { | |
| 2200 /* This function can GC */ | |
| 2201 int nargs; | |
| 2421 | 2202 Lisp_Object retval = Qnil; |
| 428 | 2203 |
| 2204 GET_LIST_LENGTH (args, nargs); | |
| 2205 | |
| 2206 if (nargs & 1) /* Odd number of arguments? */ | |
| 2207 Fsignal (Qwrong_number_of_arguments, | |
| 2208 list2 (Qsetq_default, make_int (nargs))); | |
| 2209 | |
| 2421 | 2210 GC_PROPERTY_LIST_LOOP_3 (symbol, val, args) |
| 428 | 2211 { |
|
4677
8f1ee2d15784
Support full Common Lisp multiple values in C.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4642
diff
changeset
|
2212 val = IGNORE_MULTIPLE_VALUES (Feval (val)); |
| 428 | 2213 Fset_default (symbol, val); |
| 2421 | 2214 retval = val; |
| 428 | 2215 } |
| 2216 | |
| 2421 | 2217 END_GC_PROPERTY_LIST_LOOP (symbol); |
| 2218 return retval; | |
| 428 | 2219 } |
| 2220 | |
| 2221 /* Lisp functions for creating and removing buffer-local variables. */ | |
| 2222 | |
| 2223 DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, 1, 1, | |
| 2224 "vMake Variable Buffer Local: ", /* | |
| 2225 Make VARIABLE have a separate value for each buffer. | |
| 2226 At any time, the value for the current buffer is in effect. | |
| 2227 There is also a default value which is seen in any buffer which has not yet | |
| 2228 set its own value. | |
| 2229 Using `set' or `setq' to set the variable causes it to have a separate value | |
| 2230 for the current buffer if it was previously using the default value. | |
| 2231 The function `default-value' gets the default value and `set-default' | |
| 2232 sets it. | |
| 2233 */ | |
| 2234 (variable)) | |
| 2235 { | |
| 2236 Lisp_Object valcontents; | |
| 2237 | |
| 2238 CHECK_SYMBOL (variable); | |
| 2239 | |
| 2240 retry: | |
| 2241 verify_ok_for_buffer_local (variable, Qmake_variable_buffer_local); | |
| 2242 | |
| 2243 valcontents = XSYMBOL (variable)->value; | |
| 2244 | |
| 2245 retry_2: | |
| 2246 if (SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2247 { | |
| 2248 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2249 { | |
| 2250 case SYMVAL_LISP_MAGIC: | |
| 2251 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2252 (variable, Qmake_variable_buffer_local, 0))) | |
| 2253 return variable; | |
| 2254 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2255 /* semi-change-o */ | |
| 2256 goto retry_2; | |
| 2257 | |
| 2258 case SYMVAL_VARALIAS: | |
| 2259 variable = follow_varalias_pointers (variable, | |
| 2260 Qmake_variable_buffer_local); | |
| 2261 /* presto change-o! */ | |
| 2262 goto retry; | |
| 2263 | |
| 2264 case SYMVAL_FIXNUM_FORWARD: | |
| 2265 case SYMVAL_BOOLEAN_FORWARD: | |
| 2266 case SYMVAL_OBJECT_FORWARD: | |
| 2267 case SYMVAL_UNBOUND_MARKER: | |
| 2268 break; | |
| 2269 | |
| 2270 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2271 case SYMVAL_BUFFER_LOCAL: | |
| 2272 /* Already per-each-buffer */ | |
| 2273 return variable; | |
| 2274 | |
| 2275 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2276 /* Transmogrify */ | |
| 2277 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->magic.type = | |
| 2278 SYMVAL_BUFFER_LOCAL; | |
| 2279 return variable; | |
| 2280 | |
| 2281 default: | |
| 2500 | 2282 ABORT (); |
| 428 | 2283 } |
| 2284 } | |
| 2285 | |
| 2286 { | |
| 2287 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
|
2288 = XSYMBOL_VALUE_BUFFER_LOCAL |
|
5127
a9c41067dd88
more cleanups, terminology clarification, lots of doc work
Ben Wing <ben@xemacs.org>
parents:
5125
diff
changeset
|
2289 (ALLOC_NORMAL_LISP_OBJECT (symbol_value_buffer_local)); |
| 428 | 2290 Lisp_Object foo; |
| 2291 bfwd->magic.type = SYMVAL_BUFFER_LOCAL; | |
| 2292 | |
| 2293 bfwd->default_value = find_symbol_value (variable); | |
| 2294 bfwd->current_value = valcontents; | |
| 2295 bfwd->current_alist_element = Qnil; | |
| 2296 bfwd->current_buffer = Fcurrent_buffer (); | |
| 793 | 2297 foo = wrap_symbol_value_magic (bfwd); |
| 428 | 2298 *value_slot_past_magic (variable) = foo; |
| 2299 #if 1 /* #### Yuck! FSFmacs bug-compatibility*/ | |
| 2300 /* This sets the default-value of any make-variable-buffer-local to nil. | |
| 2301 That just sucks. User can just use setq-default to effect that, | |
| 2302 but there's no way to do makunbound-default to undo this lossage. */ | |
| 2303 if (UNBOUNDP (valcontents)) | |
| 2304 bfwd->default_value = Qnil; | |
| 2305 #endif | |
| 2306 #if 0 /* #### Yuck! */ | |
| 2307 /* This sets the value to nil in this buffer. | |
| 2308 User could use (setq variable nil) to do this. | |
| 2309 It isn't as egregious to do this automatically | |
| 2310 as it is to do so to the default-value, but it's | |
| 2311 still really dubious. */ | |
| 2312 if (UNBOUNDP (valcontents)) | |
| 2313 Fset (variable, Qnil); | |
| 2314 #endif | |
| 2315 return variable; | |
| 2316 } | |
| 2317 } | |
| 2318 | |
| 2319 DEFUN ("make-local-variable", Fmake_local_variable, 1, 1, | |
| 2320 "vMake Local Variable: ", /* | |
| 2321 Make VARIABLE have a separate value in the current buffer. | |
| 2322 Other buffers will continue to share a common default value. | |
| 2323 \(The buffer-local value of VARIABLE starts out as the same value | |
| 2324 VARIABLE previously had. If VARIABLE was void, it remains void.) | |
| 2325 See also `make-variable-buffer-local'. | |
| 2326 | |
| 2327 If the variable is already arranged to become local when set, | |
| 2328 this function causes a local value to exist for this buffer, | |
| 2329 just as setting the variable would do. | |
| 2330 | |
| 2331 Do not use `make-local-variable' to make a hook variable buffer-local. | |
| 2332 Use `make-local-hook' instead. | |
| 2333 */ | |
| 2334 (variable)) | |
| 2335 { | |
| 2336 Lisp_Object valcontents; | |
| 2337 struct symbol_value_buffer_local *bfwd; | |
| 2338 | |
| 2339 CHECK_SYMBOL (variable); | |
| 2340 | |
| 2341 retry: | |
| 2342 verify_ok_for_buffer_local (variable, Qmake_local_variable); | |
| 2343 | |
| 2344 valcontents = XSYMBOL (variable)->value; | |
| 2345 | |
| 2346 retry_2: | |
| 2347 if (SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2348 { | |
| 2349 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2350 { | |
| 2351 case SYMVAL_LISP_MAGIC: | |
| 2352 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2353 (variable, Qmake_local_variable, 0))) | |
| 2354 return variable; | |
| 2355 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2356 /* semi-change-o */ | |
| 2357 goto retry_2; | |
| 2358 | |
| 2359 case SYMVAL_VARALIAS: | |
| 2360 variable = follow_varalias_pointers (variable, Qmake_local_variable); | |
| 2361 /* presto change-o! */ | |
| 2362 goto retry; | |
| 2363 | |
| 2364 case SYMVAL_FIXNUM_FORWARD: | |
| 2365 case SYMVAL_BOOLEAN_FORWARD: | |
| 2366 case SYMVAL_OBJECT_FORWARD: | |
| 2367 case SYMVAL_UNBOUND_MARKER: | |
| 2368 break; | |
| 2369 | |
| 2370 case SYMVAL_BUFFER_LOCAL: | |
| 2371 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2372 { | |
| 2373 /* Make sure the symbol has a local value in this particular | |
| 2374 buffer, by setting it to the same value it already has. */ | |
| 2375 Fset (variable, find_symbol_value (variable)); | |
| 2376 return variable; | |
| 2377 } | |
| 2378 | |
| 2379 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2380 { | |
| 2381 if (!NILP (buffer_local_alist_element (current_buffer, | |
| 2382 variable, | |
| 2383 (XSYMBOL_VALUE_BUFFER_LOCAL | |
| 2384 (valcontents))))) | |
| 2385 goto already_local_to_current_buffer; | |
| 2386 else | |
| 2387 goto already_local_to_some_other_buffer; | |
| 2388 } | |
| 2389 | |
| 2390 default: | |
| 2500 | 2391 ABORT (); |
| 428 | 2392 } |
| 2393 } | |
| 2394 | |
| 2395 /* 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
|
2396 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL |
|
5127
a9c41067dd88
more cleanups, terminology clarification, lots of doc work
Ben Wing <ben@xemacs.org>
parents:
5125
diff
changeset
|
2397 (ALLOC_NORMAL_LISP_OBJECT (symbol_value_buffer_local)); |
| 428 | 2398 bfwd->magic.type = SYMVAL_SOME_BUFFER_LOCAL; |
| 2399 | |
| 2400 bfwd->current_buffer = Qnil; | |
| 2401 bfwd->current_alist_element = Qnil; | |
| 2402 bfwd->current_value = valcontents; | |
| 2403 /* passing 0 is OK because this should never be a | |
| 2404 SYMVAL_CURRENT_BUFFER_FORWARD or SYMVAL_SELECTED_CONSOLE_FORWARD | |
| 2405 variable. */ | |
| 2406 bfwd->default_value = do_symval_forwarding (valcontents, 0, 0); | |
| 2407 | |
| 2408 #if 0 | |
| 2409 if (UNBOUNDP (bfwd->default_value)) | |
| 2410 bfwd->default_value = Qnil; /* Yuck! */ | |
| 2411 #endif | |
| 2412 | |
| 793 | 2413 valcontents = wrap_symbol_value_magic (bfwd); |
| 428 | 2414 *value_slot_past_magic (variable) = valcontents; |
| 2415 | |
| 2416 already_local_to_some_other_buffer: | |
| 2417 | |
| 2418 /* Make sure this buffer has its own value of variable */ | |
| 2419 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2420 | |
| 2421 if (UNBOUNDP (bfwd->default_value)) | |
| 2422 { | |
| 2423 /* If default value is unbound, set local value to nil. */ | |
| 793 | 2424 bfwd->current_buffer = wrap_buffer (current_buffer); |
| 428 | 2425 bfwd->current_alist_element = Fcons (variable, Qnil); |
| 2426 current_buffer->local_var_alist = | |
| 2427 Fcons (bfwd->current_alist_element, current_buffer->local_var_alist); | |
| 2428 store_symval_forwarding (variable, bfwd->current_value, Qnil); | |
| 2429 return variable; | |
| 2430 } | |
| 2431 | |
| 2432 current_buffer->local_var_alist | |
| 2433 = Fcons (Fcons (variable, bfwd->default_value), | |
| 2434 current_buffer->local_var_alist); | |
| 2435 | |
| 2436 /* Make sure symbol does not think it is set up for this buffer; | |
| 2437 force it to look once again for this buffer's value */ | |
| 2438 if (!NILP (bfwd->current_buffer) && | |
| 2439 current_buffer == XBUFFER (bfwd->current_buffer)) | |
| 2440 bfwd->current_buffer = Qnil; | |
| 2441 | |
| 2442 already_local_to_current_buffer: | |
| 2443 | |
| 2444 /* If the symbol forwards into a C variable, then swap in the | |
| 2445 variable for this buffer immediately. If C code modifies the | |
| 2446 variable before we swap in, then that new value will clobber the | |
| 2447 default value the next time we swap. */ | |
| 2448 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2449 if (SYMBOL_VALUE_MAGIC_P (bfwd->current_value)) | |
| 2450 { | |
| 2451 switch (XSYMBOL_VALUE_MAGIC_TYPE (bfwd->current_value)) | |
| 2452 { | |
| 2453 case SYMVAL_FIXNUM_FORWARD: | |
| 2454 case SYMVAL_BOOLEAN_FORWARD: | |
| 2455 case SYMVAL_OBJECT_FORWARD: | |
| 2456 case SYMVAL_DEFAULT_BUFFER_FORWARD: | |
| 2457 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1); | |
| 2458 break; | |
| 2459 | |
| 2460 case SYMVAL_UNBOUND_MARKER: | |
| 2461 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2462 break; | |
| 2463 | |
| 2464 default: | |
| 2500 | 2465 ABORT (); |
| 428 | 2466 } |
| 2467 } | |
| 2468 | |
| 2469 return variable; | |
| 2470 } | |
| 2471 | |
| 2472 DEFUN ("kill-local-variable", Fkill_local_variable, 1, 1, | |
| 2473 "vKill Local Variable: ", /* | |
| 2474 Make VARIABLE no longer have a separate value in the current buffer. | |
| 2475 From now on the default value will apply in this buffer. | |
| 2476 */ | |
| 2477 (variable)) | |
| 2478 { | |
| 2479 Lisp_Object valcontents; | |
| 2480 | |
| 2481 CHECK_SYMBOL (variable); | |
| 2482 | |
| 2483 retry: | |
| 2484 valcontents = XSYMBOL (variable)->value; | |
| 2485 | |
| 2486 retry_2: | |
| 2487 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2488 return variable; | |
| 2489 | |
| 2490 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2491 { | |
| 2492 case SYMVAL_LISP_MAGIC: | |
| 2493 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2494 (variable, Qkill_local_variable, 0))) | |
| 2495 return variable; | |
| 2496 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2497 /* semi-change-o */ | |
| 2498 goto retry_2; | |
| 2499 | |
| 2500 case SYMVAL_VARALIAS: | |
| 2501 variable = follow_varalias_pointers (variable, Qkill_local_variable); | |
| 2502 /* presto change-o! */ | |
| 2503 goto retry; | |
| 2504 | |
| 2505 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2506 { | |
| 442 | 2507 const struct symbol_value_forward *fwd |
| 428 | 2508 = XSYMBOL_VALUE_FORWARD (valcontents); |
|
4952
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4940
diff
changeset
|
2509 int offset = ((Rawbyte *) symbol_value_forward_forward (fwd) |
|
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4940
diff
changeset
|
2510 - (Rawbyte *) &buffer_local_flags); |
| 428 | 2511 int mask = |
| 2512 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); | |
| 2513 | |
| 2514 if (mask > 0) | |
| 2515 { | |
| 2516 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, | |
| 2517 Lisp_Object in_object, int flags) = | |
| 2518 symbol_value_forward_magicfun (fwd); | |
| 2519 Lisp_Object oldval = * (Lisp_Object *) | |
|
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Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2520 (offset + (Rawbyte *) XBUFFER (Vbuffer_defaults)); |
| 428 | 2521 if (magicfun) |
| 771 | 2522 (magicfun) (variable, &oldval, wrap_buffer (current_buffer), 0); |
|
4952
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Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2523 *(Lisp_Object *) (offset + (Rawbyte *) current_buffer) |
| 428 | 2524 = oldval; |
| 2525 current_buffer->local_var_flags &= ~mask; | |
| 2526 } | |
| 2527 return variable; | |
| 2528 } | |
| 2529 | |
| 2530 case SYMVAL_BUFFER_LOCAL: | |
| 2531 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2532 { | |
| 2533 /* Get rid of this buffer's alist element, if any */ | |
| 2534 struct symbol_value_buffer_local *bfwd | |
| 2535 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2536 Lisp_Object alist = current_buffer->local_var_alist; | |
| 2537 Lisp_Object alist_element | |
| 2538 = buffer_local_alist_element (current_buffer, variable, bfwd); | |
| 2539 | |
| 2540 if (!NILP (alist_element)) | |
| 2541 current_buffer->local_var_alist = Fdelq (alist_element, alist); | |
| 2542 | |
| 2543 /* Make sure symbol does not think it is set up for this buffer; | |
| 2544 force it to look once again for this buffer's value */ | |
| 2545 if (!NILP (bfwd->current_buffer) && | |
| 2546 current_buffer == XBUFFER (bfwd->current_buffer)) | |
| 2547 bfwd->current_buffer = Qnil; | |
| 2548 | |
| 2549 /* We just changed the value in the current_buffer. If this | |
| 2550 variable forwards to a C variable, we need to change the | |
| 2551 value of the C variable. set_up_buffer_local_cache() | |
| 2552 will do this. It doesn't hurt to do it always, | |
| 2553 so just go ahead and do that. */ | |
| 2554 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1); | |
| 2555 } | |
| 2556 return variable; | |
| 2557 | |
| 2558 default: | |
| 2559 return variable; | |
| 2560 } | |
| 1204 | 2561 RETURN_NOT_REACHED(Qnil); /* suppress compiler warning */ |
| 428 | 2562 } |
| 2563 | |
| 2564 | |
| 2565 DEFUN ("kill-console-local-variable", Fkill_console_local_variable, 1, 1, | |
| 2566 "vKill Console Local Variable: ", /* | |
| 2567 Make VARIABLE no longer have a separate value in the selected console. | |
| 2568 From now on the default value will apply in this console. | |
| 2569 */ | |
| 2570 (variable)) | |
| 2571 { | |
| 2572 Lisp_Object valcontents; | |
| 2573 | |
| 2574 CHECK_SYMBOL (variable); | |
| 2575 | |
| 2576 retry: | |
| 2577 valcontents = XSYMBOL (variable)->value; | |
| 2578 | |
| 2579 retry_2: | |
| 2580 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2581 return variable; | |
| 2582 | |
| 2583 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2584 { | |
| 2585 case SYMVAL_LISP_MAGIC: | |
| 2586 if (!UNBOUNDP (maybe_call_magic_handler | |
| 2587 (variable, Qkill_console_local_variable, 0))) | |
| 2588 return variable; | |
| 2589 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2590 /* semi-change-o */ | |
| 2591 goto retry_2; | |
| 2592 | |
| 2593 case SYMVAL_VARALIAS: | |
| 2594 variable = follow_varalias_pointers (variable, | |
| 2595 Qkill_console_local_variable); | |
| 2596 /* presto change-o! */ | |
| 2597 goto retry; | |
| 2598 | |
| 2599 case SYMVAL_SELECTED_CONSOLE_FORWARD: | |
| 2600 { | |
| 442 | 2601 const struct symbol_value_forward *fwd |
| 428 | 2602 = XSYMBOL_VALUE_FORWARD (valcontents); |
|
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Ben Wing <ben@xemacs.org>
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diff
changeset
|
2603 int offset = ((Rawbyte *) symbol_value_forward_forward (fwd) |
|
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2604 - (Rawbyte *) &console_local_flags); |
| 428 | 2605 int mask = |
| 2606 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd))); | |
| 2607 | |
| 2608 if (mask > 0) | |
| 2609 { | |
| 2610 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, | |
| 2611 Lisp_Object in_object, int flags) = | |
| 2612 symbol_value_forward_magicfun (fwd); | |
| 2613 Lisp_Object oldval = * (Lisp_Object *) | |
|
4952
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Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2614 (offset + (Rawbyte *) XCONSOLE (Vconsole_defaults)); |
| 428 | 2615 if (magicfun) |
| 2616 magicfun (variable, &oldval, Vselected_console, 0); | |
|
4952
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Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
2617 *(Lisp_Object *) (offset + (Rawbyte *) XCONSOLE (Vselected_console)) |
| 428 | 2618 = oldval; |
| 2619 XCONSOLE (Vselected_console)->local_var_flags &= ~mask; | |
| 2620 } | |
| 2621 return variable; | |
| 2622 } | |
| 2623 | |
| 2624 default: | |
| 2625 return variable; | |
| 2626 } | |
| 2627 } | |
| 2628 | |
| 2629 /* Used by specbind to determine what effects it might have. Returns: | |
| 2630 * 0 if symbol isn't buffer-local, and wouldn't be after it is set | |
| 2631 * <0 if symbol isn't presently buffer-local, but set would make it so | |
| 2632 * >0 if symbol is presently buffer-local | |
| 2633 */ | |
| 2634 int | |
| 2635 symbol_value_buffer_local_info (Lisp_Object symbol, struct buffer *buffer) | |
| 2636 { | |
| 2637 Lisp_Object valcontents; | |
| 2638 | |
| 2639 retry: | |
| 2640 valcontents = XSYMBOL (symbol)->value; | |
| 2641 | |
| 2642 retry_2: | |
| 2643 if (SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2644 { | |
| 2645 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2646 { | |
| 2647 case SYMVAL_LISP_MAGIC: | |
| 2648 /* #### kludge */ | |
| 2649 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2650 /* semi-change-o */ | |
| 2651 goto retry_2; | |
| 2652 | |
| 2653 case SYMVAL_VARALIAS: | |
| 2654 symbol = follow_varalias_pointers (symbol, Qt /* #### kludge */); | |
| 2655 /* presto change-o! */ | |
| 2656 goto retry; | |
| 2657 | |
| 2658 case SYMVAL_CURRENT_BUFFER_FORWARD: | |
| 2659 { | |
| 442 | 2660 const struct symbol_value_forward *fwd |
| 428 | 2661 = XSYMBOL_VALUE_FORWARD (valcontents); |
| 2662 int mask = XINT (*((Lisp_Object *) | |
| 2663 symbol_value_forward_forward (fwd))); | |
| 2664 if ((mask <= 0) || (buffer && (buffer->local_var_flags & mask))) | |
| 2665 /* Already buffer-local */ | |
| 2666 return 1; | |
| 2667 else | |
| 2668 /* Would be buffer-local after set */ | |
| 2669 return -1; | |
| 2670 } | |
| 2671 case SYMVAL_BUFFER_LOCAL: | |
| 2672 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2673 { | |
| 2674 struct symbol_value_buffer_local *bfwd | |
| 2675 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents); | |
| 2676 if (buffer | |
| 2677 && !NILP (buffer_local_alist_element (buffer, symbol, bfwd))) | |
| 2678 return 1; | |
| 2679 else | |
| 2680 /* Automatically becomes local when set */ | |
| 2681 return bfwd->magic.type == SYMVAL_BUFFER_LOCAL ? -1 : 0; | |
| 2682 } | |
| 2683 default: | |
| 2684 return 0; | |
| 2685 } | |
| 2686 } | |
| 2687 return 0; | |
| 2688 } | |
| 2689 | |
| 2690 | |
| 2691 DEFUN ("symbol-value-in-buffer", Fsymbol_value_in_buffer, 2, 3, 0, /* | |
| 2692 Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound. | |
| 2693 */ | |
| 2694 (symbol, buffer, unbound_value)) | |
| 2695 { | |
| 2696 Lisp_Object value; | |
| 2697 CHECK_SYMBOL (symbol); | |
| 2698 CHECK_BUFFER (buffer); | |
| 2699 value = symbol_value_in_buffer (symbol, buffer); | |
| 2700 return UNBOUNDP (value) ? unbound_value : value; | |
| 2701 } | |
| 2702 | |
| 2703 DEFUN ("symbol-value-in-console", Fsymbol_value_in_console, 2, 3, 0, /* | |
| 2704 Return the value of SYMBOL in CONSOLE, or UNBOUND-VALUE if it is unbound. | |
| 2705 */ | |
| 2706 (symbol, console, unbound_value)) | |
| 2707 { | |
| 2708 Lisp_Object value; | |
| 2709 CHECK_SYMBOL (symbol); | |
| 2710 CHECK_CONSOLE (console); | |
| 2711 value = symbol_value_in_console (symbol, console); | |
| 2712 return UNBOUNDP (value) ? unbound_value : value; | |
| 2713 } | |
| 2714 | |
| 2715 DEFUN ("built-in-variable-type", Fbuilt_in_variable_type, 1, 1, 0, /* | |
| 2716 If SYMBOL is a built-in variable, return info about this; else return nil. | |
| 2717 The returned info will be a symbol, one of | |
| 2718 | |
| 2719 `object' A simple built-in variable. | |
| 2720 `const-object' Same, but cannot be set. | |
| 2721 `integer' A built-in integer variable. | |
| 2722 `const-integer' Same, but cannot be set. | |
| 2723 `boolean' A built-in boolean variable. | |
| 2724 `const-boolean' Same, but cannot be set. | |
| 2725 `const-specifier' Always contains a specifier; e.g. `has-modeline-p'. | |
| 2726 `current-buffer' A built-in buffer-local variable. | |
| 2727 `const-current-buffer' Same, but cannot be set. | |
| 2728 `default-buffer' Forwards to the default value of a built-in | |
| 2729 buffer-local variable. | |
| 2730 `selected-console' A built-in console-local variable. | |
| 2731 `const-selected-console' Same, but cannot be set. | |
| 2732 `default-console' Forwards to the default value of a built-in | |
| 2733 console-local variable. | |
| 2734 */ | |
| 2735 (symbol)) | |
| 2736 { | |
| 2737 REGISTER Lisp_Object valcontents; | |
| 2738 | |
| 2739 CHECK_SYMBOL (symbol); | |
| 2740 | |
| 2741 retry: | |
| 2742 valcontents = XSYMBOL (symbol)->value; | |
| 2743 | |
| 2744 retry_2: | |
| 2745 if (!SYMBOL_VALUE_MAGIC_P (valcontents)) | |
| 2746 return Qnil; | |
| 2747 | |
| 2748 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents)) | |
| 2749 { | |
| 2750 case SYMVAL_LISP_MAGIC: | |
| 2751 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed; | |
| 2752 /* semi-change-o */ | |
| 2753 goto retry_2; | |
| 2754 | |
| 2755 case SYMVAL_VARALIAS: | |
| 2756 symbol = follow_varalias_pointers (symbol, Qt); | |
| 2757 /* presto change-o! */ | |
| 2758 goto retry; | |
| 2759 | |
| 2760 case SYMVAL_BUFFER_LOCAL: | |
| 2761 case SYMVAL_SOME_BUFFER_LOCAL: | |
| 2762 valcontents = | |
| 2763 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->current_value; | |
| 2764 /* semi-change-o */ | |
| 2765 goto retry_2; | |
| 2766 | |
| 2767 case SYMVAL_FIXNUM_FORWARD: return Qinteger; | |
| 2768 case SYMVAL_CONST_FIXNUM_FORWARD: return Qconst_integer; | |
| 2769 case SYMVAL_BOOLEAN_FORWARD: return Qboolean; | |
| 2770 case SYMVAL_CONST_BOOLEAN_FORWARD: return Qconst_boolean; | |
| 2771 case SYMVAL_OBJECT_FORWARD: return Qobject; | |
| 2772 case SYMVAL_CONST_OBJECT_FORWARD: return Qconst_object; | |
| 2773 case SYMVAL_CONST_SPECIFIER_FORWARD: return Qconst_specifier; | |
| 2774 case SYMVAL_DEFAULT_BUFFER_FORWARD: return Qdefault_buffer; | |
| 2775 case SYMVAL_CURRENT_BUFFER_FORWARD: return Qcurrent_buffer; | |
| 2776 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: return Qconst_current_buffer; | |
| 2777 case SYMVAL_DEFAULT_CONSOLE_FORWARD: return Qdefault_console; | |
| 2778 case SYMVAL_SELECTED_CONSOLE_FORWARD: return Qselected_console; | |
| 2779 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: return Qconst_selected_console; | |
| 2780 case SYMVAL_UNBOUND_MARKER: return Qnil; | |
| 2781 | |
| 2782 default: | |
| 2500 | 2783 ABORT (); return Qnil; |
| 428 | 2784 } |
| 2785 } | |
| 2786 | |
| 2787 | |
| 2788 DEFUN ("local-variable-p", Flocal_variable_p, 2, 3, 0, /* | |
| 2789 Return t if SYMBOL's value is local to BUFFER. | |
| 444 | 2790 If optional third arg AFTER-SET is non-nil, return t if SYMBOL would be |
| 428 | 2791 buffer-local after it is set, regardless of whether it is so presently. |
| 2792 A nil value for BUFFER is *not* the same as (current-buffer), but means | |
| 2793 "no buffer". Specifically: | |
| 2794 | |
| 2795 -- If BUFFER is nil and AFTER-SET is nil, a return value of t indicates that | |
| 2796 the variable is one of the special built-in variables that is always | |
| 2797 buffer-local. (This includes `buffer-file-name', `buffer-read-only', | |
| 2798 `buffer-undo-list', and others.) | |
| 2799 | |
| 2800 -- If BUFFER is nil and AFTER-SET is t, a return value of t indicates that | |
| 2801 the variable has had `make-variable-buffer-local' applied to it. | |
| 2802 */ | |
| 2803 (symbol, buffer, after_set)) | |
| 2804 { | |
| 2805 int local_info; | |
| 2806 | |
| 2807 CHECK_SYMBOL (symbol); | |
| 2808 if (!NILP (buffer)) | |
| 2809 { | |
| 2810 buffer = get_buffer (buffer, 1); | |
| 2811 local_info = symbol_value_buffer_local_info (symbol, XBUFFER (buffer)); | |
| 2812 } | |
| 2813 else | |
| 2814 { | |
| 2815 local_info = symbol_value_buffer_local_info (symbol, 0); | |
| 2816 } | |
| 2817 | |
| 2818 if (NILP (after_set)) | |
| 2819 return local_info > 0 ? Qt : Qnil; | |
| 2820 else | |
| 2821 return local_info != 0 ? Qt : Qnil; | |
| 2822 } | |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2823 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2824 DEFUN ("custom-variable-p", Fcustom_variable_p, 1, 1, 0, /* |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2825 Return non-nil if SYMBOL names a custom variable. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2826 Does not follow the variable alias chain. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2827 */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2828 (symbol)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2829 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2830 return (!(NILP (Fget(symbol, intern ("standard-value"), Qnil))) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2831 || !(NILP (Fget(symbol, intern ("custom-autoload"), Qnil)))) ? |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2832 Qt: Qnil; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2833 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2834 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2835 static Lisp_Object |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2836 user_variable_alias_check_fun (Lisp_Object symbol) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2837 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2838 Lisp_Object documentation = Fget (symbol, Qvariable_documentation, Qnil); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2839 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2840 if ((INTP (documentation) && XINT (documentation) < 0) || |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2841 (STRINGP (documentation) && |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2842 (string_byte (documentation, 0) == '*')) || |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2843 /* If (STRING . INTEGER), a negative integer means a user variable. */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
2844 (CONSP (documentation) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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diff
changeset
|
2845 && STRINGP (XCAR (documentation)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2846 && INTP (XCDR (documentation)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
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diff
changeset
|
2847 && XINT (XCDR (documentation)) < 0) || |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2848 !NILP (Fcustom_variable_p (symbol))) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
2849 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2850 return make_int(1); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2851 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2852 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2853 return Qzero; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2854 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2855 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2856 DEFUN ("user-variable-p", Fuser_variable_p, 1, 1, 0, /* |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2857 Return t if SYMBOL names a variable intended to be set and modified by users. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2858 \(The alternative is a variable used internally in a Lisp program.) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2859 A symbol names a user variable if |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
2860 \(1) the first character of its documentation is `*', or |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2861 \(2) it is customizable (`custom-variable-p' gives t), or |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2862 \(3) it names a variable alias that eventually resolves to another user variable. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2863 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2864 The GNU Emacs implementation of `user-variable-p' returns nil if there is a |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2865 loop in the chain of symbols. Since this is indistinguishable from the case |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2866 where a symbol names a non-user variable, XEmacs signals a |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2867 `cyclic-variable-indirection' error instead; use `condition-case' to catch |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2868 this error if you really want to avoid this. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2869 */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2870 (symbol)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2871 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2872 Lisp_Object mapped; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2873 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2874 if (!SYMBOLP (symbol)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2875 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2876 return Qnil; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2877 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2878 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2879 /* Called for its side-effects, we want it to signal if there's a loop. */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2880 follow_varalias_pointers (symbol, Qt); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2881 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2882 /* Look through the various aliases. */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2883 mapped = map_varalias_chain (symbol, Qt, user_variable_alias_check_fun); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2884 if (EQ (Qzero, mapped)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2885 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2886 return Qnil; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2887 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2888 |
|
4503
af95657e0bfd
Use EQ() and !EQ() in symbols.c, thank you Robert Delius Royar.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4502
diff
changeset
|
2889 assert (EQ (make_int (1), mapped)); |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2890 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2891 return Qt; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2892 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2893 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
2894 |
| 428 | 2895 |
| 2896 | |
| 2897 /* | |
| 2898 I've gone ahead and partially implemented this because it's | |
| 2899 super-useful for dealing with the compatibility problems in supporting | |
| 2900 the old pointer-shape variables, and preventing people from `setq'ing | |
| 2901 the new variables. Any other way of handling this problem is way | |
| 2902 ugly, likely to be slow, and generally not something I want to waste | |
| 2903 my time worrying about. | |
| 2904 | |
| 2905 The interface and/or function name is sure to change before this | |
| 2906 gets into its final form. I currently like the way everything is | |
| 2907 set up and it has all the features I want it to have, except for | |
| 2908 one: I really want to be able to have multiple nested handlers, | |
| 2909 to implement an `advice'-like capability. This would allow, | |
| 2910 for example, a clean way of implementing `debug-if-set' or | |
| 2911 `debug-if-referenced' and such. | |
| 2912 | |
| 2913 NOTE NOTE NOTE NOTE NOTE NOTE NOTE: | |
| 2914 ************************************************************ | |
| 2915 **Only** the `set-value', `make-unbound', and `make-local' | |
| 2916 handler types are currently implemented. Implementing the | |
| 2917 get-value and bound-predicate handlers is somewhat tricky | |
| 2918 because there are lots of subfunctions (e.g. find_symbol_value()). | |
| 2919 find_symbol_value(), in fact, is called from outside of | |
| 2920 this module. You'd have to have it do this: | |
| 2921 | |
| 2922 -- check for a `bound-predicate' handler, call that if so; | |
| 2923 if it returns nil, return Qunbound | |
| 2924 -- check for a `get-value' handler and call it and return | |
| 2925 that value | |
| 2926 | |
| 2927 It gets even trickier when you have to deal with | |
| 2928 sub-subfunctions like find_symbol_value_1(), and esp. | |
| 2929 when you have to properly handle variable aliases, which | |
| 2930 can lead to lots of tricky situations. So I've just | |
| 2931 punted on this, since the interface isn't officially | |
| 2932 exported and we can get by with just a `set-value' | |
| 2933 handler. | |
| 2934 | |
| 2935 Actions in unimplemented handler types will correctly | |
| 2936 ignore any handlers, and will not fuck anything up or | |
| 2937 go awry. | |
| 2938 | |
| 2939 WARNING WARNING: If you do go and implement another | |
| 2940 type of handler, make *sure* to change | |
| 2941 would_be_magic_handled() so it knows about this, | |
| 2942 or dire things could result. | |
| 2943 ************************************************************ | |
| 2944 NOTE NOTE NOTE NOTE NOTE NOTE NOTE | |
| 2945 | |
| 2946 Real documentation is as follows. | |
| 2947 | |
| 2948 Set a magic handler for VARIABLE. | |
| 2949 This allows you to specify arbitrary behavior that results from | |
| 2950 accessing or setting a variable. For example, retrieving the | |
| 2951 variable's value might actually retrieve the first element off of | |
| 2952 a list stored in another variable, and setting the variable's value | |
| 2953 might add an element to the front of that list. (This is how the | |
| 2954 obsolete variable `unread-command-event' is implemented.) | |
| 2955 | |
| 2956 In general it is NOT good programming practice to use magic variables | |
| 2957 in a new package that you are designing. If you feel the need to | |
| 2958 do this, it's almost certainly a sign that you should be using a | |
| 2959 function instead of a variable. This facility is provided to allow | |
| 2960 a package to support obsolete variables and provide compatibility | |
| 2961 with similar packages with different variable names and semantics. | |
| 2962 By using magic handlers, you can cleanly provide obsoleteness and | |
| 2963 compatibility support and separate this support from the core | |
| 2964 routines in a package. | |
| 2965 | |
| 2966 VARIABLE should be a symbol naming the variable for which the | |
| 2967 magic behavior is provided. HANDLER-TYPE is a symbol specifying | |
| 2968 which behavior is being controlled, and HANDLER is the function | |
| 2969 that will be called to control this behavior. HARG is a | |
| 2970 value that will be passed to HANDLER but is otherwise | |
| 2971 uninterpreted. KEEP-EXISTING specifies what to do with existing | |
| 2972 handlers of the same type; nil means "erase them all", t means | |
| 2973 "keep them but insert at the beginning", the list (t) means | |
| 2974 "keep them but insert at the end", a function means "keep | |
| 2975 them but insert before the specified function", a list containing | |
| 2976 a function means "keep them but insert after the specified | |
| 2977 function". | |
| 2978 | |
| 2979 You can specify magic behavior for any type of variable at all, | |
| 2980 and for any handler types that are unspecified, the standard | |
| 2981 behavior applies. This allows you, for example, to use | |
| 2982 `defvaralias' in conjunction with this function. (For that | |
| 2983 matter, `defvaralias' could be implemented using this function.) | |
| 2984 | |
| 2985 The behaviors that can be specified in HANDLER-TYPE are | |
| 2986 | |
| 2987 get-value (SYM ARGS FUN HARG HANDLERS) | |
| 2988 This means that one of the functions `symbol-value', | |
| 2989 `default-value', `symbol-value-in-buffer', or | |
| 2990 `symbol-value-in-console' was called on SYM. | |
| 2991 | |
| 2992 set-value (SYM ARGS FUN HARG HANDLERS) | |
| 2993 This means that one of the functions `set' or `set-default' | |
| 2994 was called on SYM. | |
| 2995 | |
| 2996 bound-predicate (SYM ARGS FUN HARG HANDLERS) | |
| 2997 This means that one of the functions `boundp', `globally-boundp', | |
| 2998 or `default-boundp' was called on SYM. | |
| 2999 | |
| 3000 make-unbound (SYM ARGS FUN HARG HANDLERS) | |
| 3001 This means that the function `makunbound' was called on SYM. | |
| 3002 | |
| 3003 local-predicate (SYM ARGS FUN HARG HANDLERS) | |
| 3004 This means that the function `local-variable-p' was called | |
| 3005 on SYM. | |
| 3006 | |
| 3007 make-local (SYM ARGS FUN HARG HANDLERS) | |
| 3008 This means that one of the functions `make-local-variable', | |
| 3009 `make-variable-buffer-local', `kill-local-variable', | |
| 3010 or `kill-console-local-variable' was called on SYM. | |
| 3011 | |
| 3012 The meanings of the arguments are as follows: | |
| 3013 | |
| 3014 SYM is the symbol on which the function was called, and is always | |
| 3015 the first argument to the function. | |
| 3016 | |
| 3017 ARGS are the remaining arguments in the original call (i.e. all | |
| 3018 but the first). In the case of `set-value' in particular, | |
| 3019 the first element of ARGS is the value to which the variable | |
| 3020 is being set. In some cases, ARGS is sanitized from what was | |
| 3021 actually given. For example, whenever `nil' is passed to an | |
| 3022 argument and it means `current-buffer', the current buffer is | |
| 3023 substituted instead. | |
| 3024 | |
| 3025 FUN is a symbol indicating which function is being called. | |
| 3026 For many of the functions, you can determine the corresponding | |
| 3027 function of a different class using | |
| 3028 `symbol-function-corresponding-function'. | |
| 3029 | |
| 3030 HARG is the argument that was given in the call | |
| 3031 to `set-symbol-value-handler' for SYM and HANDLER-TYPE. | |
| 3032 | |
| 3033 HANDLERS is a structure containing the remaining handlers | |
| 3034 for the variable; to call one of them, use | |
| 3035 `chain-to-symbol-value-handler'. | |
| 3036 | |
| 3037 NOTE: You may *not* modify the list in ARGS, and if you want to | |
| 3038 keep it around after the handler function exits, you must make | |
| 3039 a copy using `copy-sequence'. (Same caveats for HANDLERS also.) | |
| 3040 */ | |
| 3041 | |
| 3042 static enum lisp_magic_handler | |
| 3043 decode_magic_handler_type (Lisp_Object symbol) | |
| 3044 { | |
| 3045 if (EQ (symbol, Qget_value)) return MAGIC_HANDLER_GET_VALUE; | |
| 3046 if (EQ (symbol, Qset_value)) return MAGIC_HANDLER_SET_VALUE; | |
| 3047 if (EQ (symbol, Qbound_predicate)) return MAGIC_HANDLER_BOUND_PREDICATE; | |
| 3048 if (EQ (symbol, Qmake_unbound)) return MAGIC_HANDLER_MAKE_UNBOUND; | |
| 3049 if (EQ (symbol, Qlocal_predicate)) return MAGIC_HANDLER_LOCAL_PREDICATE; | |
| 3050 if (EQ (symbol, Qmake_local)) return MAGIC_HANDLER_MAKE_LOCAL; | |
| 3051 | |
| 563 | 3052 invalid_constant ("Unrecognized symbol value handler type", symbol); |
| 1204 | 3053 RETURN_NOT_REACHED (MAGIC_HANDLER_MAX); |
| 428 | 3054 } |
| 3055 | |
| 3056 static enum lisp_magic_handler | |
| 3057 handler_type_from_function_symbol (Lisp_Object funsym, int abort_if_not_found) | |
| 3058 { | |
| 3059 if (EQ (funsym, Qsymbol_value) | |
| 3060 || EQ (funsym, Qdefault_value) | |
| 3061 || EQ (funsym, Qsymbol_value_in_buffer) | |
| 3062 || EQ (funsym, Qsymbol_value_in_console)) | |
| 3063 return MAGIC_HANDLER_GET_VALUE; | |
| 3064 | |
| 3065 if (EQ (funsym, Qset) | |
| 3066 || EQ (funsym, Qset_default)) | |
| 3067 return MAGIC_HANDLER_SET_VALUE; | |
| 3068 | |
| 3069 if (EQ (funsym, Qboundp) | |
| 3070 || EQ (funsym, Qglobally_boundp) | |
| 3071 || EQ (funsym, Qdefault_boundp)) | |
| 3072 return MAGIC_HANDLER_BOUND_PREDICATE; | |
| 3073 | |
| 3074 if (EQ (funsym, Qmakunbound)) | |
| 3075 return MAGIC_HANDLER_MAKE_UNBOUND; | |
| 3076 | |
| 3077 if (EQ (funsym, Qlocal_variable_p)) | |
| 3078 return MAGIC_HANDLER_LOCAL_PREDICATE; | |
| 3079 | |
| 3080 if (EQ (funsym, Qmake_variable_buffer_local) | |
| 3081 || EQ (funsym, Qmake_local_variable)) | |
| 3082 return MAGIC_HANDLER_MAKE_LOCAL; | |
| 3083 | |
| 3084 if (abort_if_not_found) | |
| 2500 | 3085 ABORT (); |
| 563 | 3086 invalid_argument ("Unrecognized symbol-value function", funsym); |
| 1204 | 3087 RETURN_NOT_REACHED (MAGIC_HANDLER_MAX); |
| 428 | 3088 } |
| 3089 | |
| 3090 static int | |
| 3091 would_be_magic_handled (Lisp_Object sym, Lisp_Object funsym) | |
| 3092 { | |
| 3093 /* does not take into account variable aliasing. */ | |
| 3094 Lisp_Object valcontents = XSYMBOL (sym)->value; | |
| 3095 enum lisp_magic_handler slot; | |
| 3096 | |
| 3097 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents)) | |
| 3098 return 0; | |
| 3099 slot = handler_type_from_function_symbol (funsym, 1); | |
| 3100 if (slot != MAGIC_HANDLER_SET_VALUE && slot != MAGIC_HANDLER_MAKE_UNBOUND | |
| 3101 && slot != MAGIC_HANDLER_MAKE_LOCAL) | |
| 3102 /* #### temporary kludge because we haven't implemented | |
| 3103 lisp-magic variables completely */ | |
| 3104 return 0; | |
| 3105 return !NILP (XSYMBOL_VALUE_LISP_MAGIC (valcontents)->handler[slot]); | |
| 3106 } | |
| 3107 | |
| 3108 static Lisp_Object | |
| 3109 fetch_value_maybe_past_magic (Lisp_Object sym, | |
| 3110 Lisp_Object follow_past_lisp_magic) | |
| 3111 { | |
| 3112 Lisp_Object value = XSYMBOL (sym)->value; | |
| 3113 if (SYMBOL_VALUE_LISP_MAGIC_P (value) | |
| 3114 && (EQ (follow_past_lisp_magic, Qt) | |
| 3115 || (!NILP (follow_past_lisp_magic) | |
| 3116 && !would_be_magic_handled (sym, follow_past_lisp_magic)))) | |
| 3117 value = XSYMBOL_VALUE_LISP_MAGIC (value)->shadowed; | |
| 3118 return value; | |
| 3119 } | |
| 3120 | |
| 3121 static Lisp_Object * | |
| 3122 value_slot_past_magic (Lisp_Object sym) | |
| 3123 { | |
| 3124 Lisp_Object *store_pointer = &XSYMBOL (sym)->value; | |
| 3125 | |
| 3126 if (SYMBOL_VALUE_LISP_MAGIC_P (*store_pointer)) | |
| 3127 store_pointer = &XSYMBOL_VALUE_LISP_MAGIC (sym)->shadowed; | |
| 3128 return store_pointer; | |
| 3129 } | |
| 3130 | |
| 3131 static Lisp_Object | |
| 3132 maybe_call_magic_handler (Lisp_Object sym, Lisp_Object funsym, int nargs, ...) | |
| 3133 { | |
| 3134 va_list vargs; | |
| 3135 Lisp_Object args[20]; /* should be enough ... */ | |
| 3136 int i; | |
| 3137 enum lisp_magic_handler htype; | |
| 3138 Lisp_Object legerdemain; | |
| 3139 struct symbol_value_lisp_magic *bfwd; | |
| 3140 | |
| 440 | 3141 assert (nargs >= 0 && nargs < countof (args)); |
| 428 | 3142 legerdemain = XSYMBOL (sym)->value; |
| 3143 assert (SYMBOL_VALUE_LISP_MAGIC_P (legerdemain)); | |
| 3144 bfwd = XSYMBOL_VALUE_LISP_MAGIC (legerdemain); | |
| 3145 | |
| 3146 va_start (vargs, nargs); | |
| 3147 for (i = 0; i < nargs; i++) | |
| 3148 args[i] = va_arg (vargs, Lisp_Object); | |
| 3149 va_end (vargs); | |
| 3150 | |
| 3151 htype = handler_type_from_function_symbol (funsym, 1); | |
| 3152 if (NILP (bfwd->handler[htype])) | |
| 3153 return Qunbound; | |
| 3154 /* #### should be reusing the arglist, not always consing anew. | |
| 3155 Repeated handler invocations should not cause repeated consing. | |
| 3156 Doesn't matter for now, because this is just a quick implementation | |
| 3157 for obsolescence support. */ | |
| 3158 return call5 (bfwd->handler[htype], sym, Flist (nargs, args), funsym, | |
| 3159 bfwd->harg[htype], Qnil); | |
| 3160 } | |
| 3161 | |
| 3162 DEFUN ("dontusethis-set-symbol-value-handler", Fdontusethis_set_symbol_value_handler, | |
| 3163 3, 5, 0, /* | |
| 3164 Don't you dare use this. | |
| 3165 If you do, suffer the wrath of Ben, who is likely to rename | |
| 3166 this function (or change the semantics of its arguments) without | |
| 3167 pity, thereby invalidating your code. | |
| 3168 */ | |
| 2286 | 3169 (variable, handler_type, handler, harg, |
|
4642
48b45a606961
Support #'function-arglist with built-in special forms.
Aidan Kehoe <kehoea@parhasard.net>
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4535
diff
changeset
|
3170 UNUSED (keep_existing ))) |
| 428 | 3171 { |
| 3172 Lisp_Object valcontents; | |
| 3173 struct symbol_value_lisp_magic *bfwd; | |
| 3174 enum lisp_magic_handler htype; | |
| 3175 int i; | |
| 3176 | |
| 3177 /* #### WARNING, only some handler types are implemented. See above. | |
| 3178 Actions of other types will ignore a handler if it's there. | |
| 3179 | |
| 3180 #### Also, `chain-to-symbol-value-handler' and | |
| 3181 `symbol-function-corresponding-function' are not implemented. */ | |
| 3182 CHECK_SYMBOL (variable); | |
| 3183 CHECK_SYMBOL (handler_type); | |
| 3184 htype = decode_magic_handler_type (handler_type); | |
| 3185 valcontents = XSYMBOL (variable)->value; | |
| 3186 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents)) | |
| 3187 { | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3188 bfwd = |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3189 XSYMBOL_VALUE_LISP_MAGIC |
|
5127
a9c41067dd88
more cleanups, terminology clarification, lots of doc work
Ben Wing <ben@xemacs.org>
parents:
5125
diff
changeset
|
3190 (ALLOC_NORMAL_LISP_OBJECT (symbol_value_lisp_magic)); |
| 428 | 3191 bfwd->magic.type = SYMVAL_LISP_MAGIC; |
| 3192 for (i = 0; i < MAGIC_HANDLER_MAX; i++) | |
| 3193 { | |
| 3194 bfwd->handler[i] = Qnil; | |
| 3195 bfwd->harg[i] = Qnil; | |
| 3196 } | |
| 3197 bfwd->shadowed = valcontents; | |
| 793 | 3198 XSYMBOL (variable)->value = wrap_symbol_value_magic (bfwd); |
| 428 | 3199 } |
| 3200 else | |
| 3201 bfwd = XSYMBOL_VALUE_LISP_MAGIC (valcontents); | |
| 3202 bfwd->handler[htype] = handler; | |
| 3203 bfwd->harg[htype] = harg; | |
| 3204 | |
| 3205 for (i = 0; i < MAGIC_HANDLER_MAX; i++) | |
| 3206 if (!NILP (bfwd->handler[i])) | |
| 3207 break; | |
| 3208 | |
| 3209 if (i == MAGIC_HANDLER_MAX) | |
| 3210 /* there are no remaining handlers, so remove the structure. */ | |
| 3211 XSYMBOL (variable)->value = bfwd->shadowed; | |
| 3212 | |
| 3213 return Qnil; | |
| 3214 } | |
| 3215 | |
| 3216 | |
| 3217 /* functions for working with variable aliases. */ | |
| 3218 | |
| 3219 /* Follow the chain of variable aliases for SYMBOL. Return the | |
| 3220 resulting symbol, whose value cell is guaranteed not to be a | |
| 3221 symbol-value-varalias. | |
| 3222 | |
| 3223 Also maybe follow past symbol-value-lisp-magic -> symbol-value-varalias. | |
| 3224 If FUNSYM is t, always follow in such a case. If FUNSYM is nil, | |
| 3225 never follow; stop right there. Otherwise FUNSYM should be a | |
| 3226 recognized symbol-value function symbol; this means, follow | |
| 3227 unless there is a special handler for the named function. | |
| 3228 | |
| 3229 OK, there is at least one reason why it's necessary for | |
| 3230 FOLLOW-PAST-LISP-MAGIC to be specified correctly: So that we | |
| 3231 can always be sure to catch cyclic variable aliasing. If we never | |
| 3232 follow past Lisp magic, then if the following is done: | |
| 3233 | |
| 3234 (defvaralias 'a 'b) | |
| 3235 add some magic behavior to a, but not a "get-value" handler | |
| 3236 (defvaralias 'b 'a) | |
| 3237 | |
| 3238 then an attempt to retrieve a's or b's value would cause infinite | |
| 3239 looping in `symbol-value'. | |
| 3240 | |
| 3241 We (of course) can't always follow past Lisp magic, because then | |
| 3242 we make any variable that is lisp-magic -> varalias behave as if | |
| 3243 the lisp-magic is not present at all. | |
| 3244 */ | |
| 3245 | |
| 3246 static Lisp_Object | |
| 3247 follow_varalias_pointers (Lisp_Object symbol, | |
| 3248 Lisp_Object follow_past_lisp_magic) | |
| 3249 { | |
| 3250 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16 | |
| 3251 Lisp_Object tortoise, hare, val; | |
| 3252 int count; | |
| 3253 | |
| 3254 /* quick out just in case */ | |
| 3255 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value)) | |
| 3256 return symbol; | |
| 3257 | |
| 3258 /* Compare implementation of indirect_function(). */ | |
| 3259 for (hare = tortoise = symbol, count = 0; | |
| 3260 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic), | |
| 3261 SYMBOL_VALUE_VARALIAS_P (val); | |
| 3262 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)), | |
| 3263 count++) | |
| 3264 { | |
| 3265 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue; | |
| 3266 | |
| 3267 if (count & 1) | |
| 3268 tortoise = symbol_value_varalias_aliasee | |
| 3269 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic | |
| 3270 (tortoise, follow_past_lisp_magic))); | |
| 3271 if (EQ (hare, tortoise)) | |
| 3272 return Fsignal (Qcyclic_variable_indirection, list1 (symbol)); | |
| 3273 } | |
| 3274 | |
| 3275 return hare; | |
| 3276 } | |
| 3277 | |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3278 /* Map FN over the chain of variable aliases for SYMBOL. If FN returns |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3279 something other than Qzero for some link in the chain, return that |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3280 immediately. Otherwise return Qzero (which is not a symbol). |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3281 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3282 FN may be called twice on the same symbol if the varalias chain is |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3283 cyclic. Prevent this by calling follow_varalias_pointers first for its |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3284 side-effects. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3285 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3286 Signals a cyclic-variable-indirection error if a cyclic structure is |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3287 detected. */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3288 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3289 static Lisp_Object |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3290 map_varalias_chain (Lisp_Object symbol, |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3291 Lisp_Object follow_past_lisp_magic, |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3292 Lisp_Object (*fn) (Lisp_Object arg)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3293 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3294 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3295 Lisp_Object tortoise, hare, val, res; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3296 int count; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3297 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3298 assert (fn); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3299 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3300 /* quick out just in case */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3301 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3302 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3303 return (fn)(symbol); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3304 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3305 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3306 /* Compare implementation of indirect_function(). */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3307 for (hare = tortoise = symbol, count = 0; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3308 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic), |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3309 SYMBOL_VALUE_VARALIAS_P (val); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3310 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)), |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3311 count++) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3312 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3313 res = (fn) (hare); |
|
4503
af95657e0bfd
Use EQ() and !EQ() in symbols.c, thank you Robert Delius Royar.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4502
diff
changeset
|
3314 if (!EQ (Qzero, res)) |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3315 { |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3316 return res; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3317 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3318 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3319 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue; |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3320 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3321 if (count & 1) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3322 tortoise = symbol_value_varalias_aliasee |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3323 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3324 (tortoise, follow_past_lisp_magic))); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3325 if (EQ (hare, tortoise)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3326 return Fsignal (Qcyclic_variable_indirection, list1 (symbol)); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3327 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3328 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3329 return (fn) (hare); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3330 } |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3331 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3332 /* |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3333 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3334 OED entry, 2nd edition, IPA transliterated using Kirshenbaum: |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3335 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3336 alias ('eIlI@s, '&lI@s), adv. and n. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3337 [...] |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3338 B. n. (with pl. aliases.) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3339 1. Another name, an assumed name. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3340 1605 Camden Rem. (1614) 147 An Alias or double name cannot preiudice the honest. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3341 1831 Edin. Rev. LIII. 364 He has been assuming various aliases. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3342 1861 Macaulay Hist. Eng. V. 92 The monk who was sometimes called Harrison |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3343 and sometimes went by the alias of Johnson. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3344 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3345 The alias is the fake name. Let's try to follow that usage in our |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3346 documentation. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3347 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3348 */ |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3349 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3350 DEFUN ("defvaralias", Fdefvaralias, 2, 3, 0, /* |
| 428 | 3351 Define a variable as an alias for another variable. |
| 3352 Thenceforth, any operations performed on VARIABLE will actually be | |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3353 performed on ALIASED. Both VARIABLE and ALIASED should be symbols. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3354 If ALIASED is nil and VARIABLE is an existing alias, remove that alias. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3355 ALIASED can itself be an alias, and the chain of variable aliases |
| 428 | 3356 will be followed appropriately. |
| 3357 If VARIABLE already has a value, this value will be shadowed | |
| 3358 until the alias is removed, at which point it will be restored. | |
| 3359 Currently VARIABLE cannot be a built-in variable, a variable that | |
| 3360 has a buffer-local value in any buffer, or the symbols nil or t. | |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3361 \(ALIASED, however, can be any type of variable.) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3362 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3363 Optional argument DOCSTRING is documentation for VARIABLE in its use as an |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3364 alias for ALIASED. The XEmacs help code ignores this documentation, using |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3365 the documentation of ALIASED instead, and the docstring, if specified, is |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
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4355
diff
changeset
|
3366 not shadowed in the same way that the value is. Only use it if you know |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
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4355
diff
changeset
|
3367 what you're doing. |
| 428 | 3368 */ |
|
4502
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diff
changeset
|
3369 (variable, aliased, docstring)) |
| 428 | 3370 { |
| 3371 struct symbol_value_varalias *bfwd; | |
| 3372 Lisp_Object valcontents; | |
| 3373 | |
| 3374 CHECK_SYMBOL (variable); | |
| 3375 reject_constant_symbols (variable, Qunbound, 0, Qt); | |
| 3376 | |
| 3377 valcontents = XSYMBOL (variable)->value; | |
| 3378 | |
|
4502
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Handle varalias chains, custom variables in #'user-variable-p.
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diff
changeset
|
3379 if (NILP (aliased)) |
| 428 | 3380 { |
| 3381 if (SYMBOL_VALUE_VARALIAS_P (valcontents)) | |
| 3382 { | |
| 3383 XSYMBOL (variable)->value = | |
| 3384 symbol_value_varalias_shadowed | |
| 3385 (XSYMBOL_VALUE_VARALIAS (valcontents)); | |
| 3386 } | |
| 3387 return Qnil; | |
| 3388 } | |
| 3389 | |
|
4502
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
3390 CHECK_SYMBOL (aliased); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
3391 |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
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4355
diff
changeset
|
3392 if (!NILP (docstring)) |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
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parents:
4355
diff
changeset
|
3393 Fput (variable, Qvariable_documentation, docstring); |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4355
diff
changeset
|
3394 |
| 428 | 3395 if (SYMBOL_VALUE_VARALIAS_P (valcontents)) |
| 3396 { | |
| 3397 /* transmogrify */ | |
|
4502
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Handle varalias chains, custom variables in #'user-variable-p.
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diff
changeset
|
3398 XSYMBOL_VALUE_VARALIAS (valcontents)->aliasee = aliased; |
| 428 | 3399 return Qnil; |
| 3400 } | |
| 3401 | |
| 3402 if (SYMBOL_VALUE_MAGIC_P (valcontents) | |
| 3403 && !UNBOUNDP (valcontents)) | |
| 563 | 3404 invalid_change ("Variable is magic and cannot be aliased", variable); |
| 428 | 3405 reject_constant_symbols (variable, Qunbound, 0, Qt); |
| 3406 | |
|
5117
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Checking in final CVS version of workspace 'ben-lisp-object'
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3024
diff
changeset
|
3407 bfwd = |
|
5127
a9c41067dd88
more cleanups, terminology clarification, lots of doc work
Ben Wing <ben@xemacs.org>
parents:
5125
diff
changeset
|
3408 XSYMBOL_VALUE_VARALIAS (ALLOC_NORMAL_LISP_OBJECT (symbol_value_varalias)); |
| 428 | 3409 bfwd->magic.type = SYMVAL_VARALIAS; |
|
4502
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Handle varalias chains, custom variables in #'user-variable-p.
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4355
diff
changeset
|
3410 bfwd->aliasee = aliased; |
| 428 | 3411 bfwd->shadowed = valcontents; |
| 3412 | |
| 793 | 3413 valcontents = wrap_symbol_value_magic (bfwd); |
| 428 | 3414 XSYMBOL (variable)->value = valcontents; |
| 3415 return Qnil; | |
| 3416 } | |
| 3417 | |
| 3418 DEFUN ("variable-alias", Fvariable_alias, 1, 2, 0, /* | |
|
4502
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Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
3419 If VARIABLE is an alias of another variable, return that variable. |
|
8748a3f7ceb4
Handle varalias chains, custom variables in #'user-variable-p.
Aidan Kehoe <kehoea@parhasard.net>
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4355
diff
changeset
|
3420 VARIABLE should be a symbol. If VARIABLE is not an alias, return nil. |
| 428 | 3421 Variable aliases are created with `defvaralias'. See also |
| 3422 `indirect-variable'. | |
| 3423 */ | |
| 3424 (variable, follow_past_lisp_magic)) | |
| 3425 { | |
| 3426 Lisp_Object valcontents; | |
| 3427 | |
| 3428 CHECK_SYMBOL (variable); | |
| 3429 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt)) | |
| 3430 { | |
| 3431 CHECK_SYMBOL (follow_past_lisp_magic); | |
| 3432 handler_type_from_function_symbol (follow_past_lisp_magic, 0); | |
| 3433 } | |
| 3434 | |
| 3435 valcontents = fetch_value_maybe_past_magic (variable, | |
| 3436 follow_past_lisp_magic); | |
| 3437 | |
| 3438 if (SYMBOL_VALUE_VARALIAS_P (valcontents)) | |
| 3439 return symbol_value_varalias_aliasee | |
| 3440 (XSYMBOL_VALUE_VARALIAS (valcontents)); | |
| 3441 else | |
| 3442 return Qnil; | |
| 3443 } | |
| 3444 | |
| 3445 DEFUN ("indirect-variable", Findirect_variable, 1, 2, 0, /* | |
| 3446 Return the variable at the end of OBJECT's variable-alias chain. | |
| 3447 If OBJECT is a symbol, follow all variable aliases and return | |
| 3448 the final (non-aliased) symbol. Variable aliases are created with | |
| 3449 the function `defvaralias'. | |
| 3450 If OBJECT is not a symbol, just return it. | |
| 3451 Signal a cyclic-variable-indirection error if there is a loop in the | |
| 3452 variable chain of symbols. | |
| 3453 */ | |
| 3454 (object, follow_past_lisp_magic)) | |
| 3455 { | |
| 3456 if (!SYMBOLP (object)) | |
| 3457 return object; | |
| 3458 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt)) | |
| 3459 { | |
| 3460 CHECK_SYMBOL (follow_past_lisp_magic); | |
| 3461 handler_type_from_function_symbol (follow_past_lisp_magic, 0); | |
| 3462 } | |
| 3463 return follow_varalias_pointers (object, follow_past_lisp_magic); | |
| 3464 } | |
| 3465 | |
| 1674 | 3466 DEFUN ("variable-binding-locus", Fvariable_binding_locus, 1, 1, 0, /* |
| 3467 Return a value indicating where VARIABLE's current binding comes from. | |
| 3468 If the current binding is buffer-local, the value is the current buffer. | |
| 3469 If the current binding is global (the default), the value is nil. | |
| 3470 */ | |
| 3471 (variable)) | |
| 3472 { | |
| 3473 Lisp_Object valcontents; | |
| 3474 | |
| 3475 CHECK_SYMBOL (variable); | |
| 3476 variable = Findirect_variable (variable, Qnil); | |
| 3477 | |
| 3478 /* Make sure the current binding is actually swapped in. */ | |
| 3479 find_symbol_value (variable); | |
| 3480 | |
| 3481 valcontents = XSYMBOL (variable)->value; | |
| 3482 | |
| 3483 if (SYMBOL_VALUE_MAGIC_P (valcontents) | |
| 3484 && ((XSYMBOL_VALUE_MAGIC_TYPE (valcontents) == SYMVAL_BUFFER_LOCAL) | |
| 3485 || (XSYMBOL_VALUE_MAGIC_TYPE (valcontents) == SYMVAL_SOME_BUFFER_LOCAL)) | |
| 3486 && (!NILP (Flocal_variable_p (variable, Fcurrent_buffer (), Qnil)))) | |
| 3487 return Fcurrent_buffer (); | |
| 3488 else | |
| 3489 return Qnil; | |
| 3490 } | |
| 428 | 3491 |
| 3492 /************************************************************************/ | |
| 3493 /* initialization */ | |
| 3494 /************************************************************************/ | |
| 3495 | |
| 3496 /* A dumped XEmacs image has a lot more than 1511 symbols. Last | |
| 3497 estimate was that there were actually around 6300. So let's try | |
| 3498 making this bigger and see if we get better hashing behavior. */ | |
| 3499 #define OBARRAY_SIZE 16411 | |
| 3500 | |
| 3501 #ifndef Qzero | |
| 3502 Lisp_Object Qzero; | |
| 3503 #endif | |
| 3504 #ifndef Qnull_pointer | |
| 3505 Lisp_Object Qnull_pointer; | |
| 3506 #endif | |
| 3507 | |
| 3263 | 3508 #ifndef NEW_GC |
| 428 | 3509 /* some losing systems can't have static vars at function scope... */ |
| 442 | 3510 static const struct symbol_value_magic guts_of_unbound_marker = |
| 3511 { /* struct symbol_value_magic */ | |
| 3024 | 3512 { /* struct old_lcrecord_header */ |
| 442 | 3513 { /* struct lrecord_header */ |
| 3514 lrecord_type_symbol_value_forward, /* lrecord_type_index */ | |
| 3515 1, /* mark bit */ | |
| 3516 1, /* c_readonly bit */ | |
| 3517 1, /* lisp_readonly bit */ | |
| 3518 }, | |
| 3519 0, /* next */ | |
| 3520 }, | |
| 3521 0, /* value */ | |
| 3522 SYMVAL_UNBOUND_MARKER | |
| 3523 }; | |
| 3263 | 3524 #endif /* not NEW_GC */ |
| 428 | 3525 |
|
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|
3526 static void |
|
1fae11d56ad2
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Ben Wing <ben@xemacs.org>
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5146
diff
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|
3527 reinit_symbol_objects_early (void) |
|
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redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
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|
3528 { |
|
1fae11d56ad2
redo memory-usage mechanism, add way of dynamically initializing Lisp objects
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diff
changeset
|
3529 OBJECT_HAS_METHOD (symbol, getprop); |
|
1fae11d56ad2
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5146
diff
changeset
|
3530 OBJECT_HAS_METHOD (symbol, putprop); |
|
1fae11d56ad2
redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
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|
3531 OBJECT_HAS_METHOD (symbol, remprop); |
|
1fae11d56ad2
redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
parents:
5146
diff
changeset
|
3532 OBJECT_HAS_NAMED_METHOD (symbol, plist, Fsymbol_plist); |
|
5255
b5611afbcc76
Support process plists, for greater GNU compatibility.
Aidan Kehoe <kehoea@parhasard.net>
parents:
5222
diff
changeset
|
3533 OBJECT_HAS_NAMED_METHOD (symbol, setplist, Fsetplist); |
|
5157
1fae11d56ad2
redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
parents:
5146
diff
changeset
|
3534 } |
|
1fae11d56ad2
redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
parents:
5146
diff
changeset
|
3535 |
| 428 | 3536 void |
| 3537 init_symbols_once_early (void) | |
| 3538 { | |
|
5117
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3539 INIT_LISP_OBJECT (symbol); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
3024
diff
changeset
|
3540 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
|
3541 INIT_LISP_OBJECT (symbol_value_buffer_local); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
Ben Wing <ben@xemacs.org>
parents:
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diff
changeset
|
3542 INIT_LISP_OBJECT (symbol_value_lisp_magic); |
|
3742ea8250b5
Checking in final CVS version of workspace 'ben-lisp-object'
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parents:
3024
diff
changeset
|
3543 INIT_LISP_OBJECT (symbol_value_varalias); |
| 442 | 3544 |
|
5157
1fae11d56ad2
redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
parents:
5146
diff
changeset
|
3545 reinit_symbol_objects_early (); |
| 428 | 3546 |
| 3547 /* Bootstrapping problem: Qnil isn't set when make_string_nocopy is | |
| 3548 called the first time. */ | |
| 867 | 3549 Qnil = Fmake_symbol (make_string_nocopy ((const Ibyte *) "nil", 3)); |
| 793 | 3550 XSTRING_PLIST (XSYMBOL (Qnil)->name) = Qnil; |
|
5157
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redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
parents:
5146
diff
changeset
|
3551 XSYMBOL (Qnil)->value = Qnil; /* Nihil ex nihilo */ |
| 428 | 3552 XSYMBOL (Qnil)->plist = Qnil; |
| 3553 | |
| 3554 Vobarray = make_vector (OBARRAY_SIZE, Qzero); | |
| 3555 initial_obarray = Vobarray; | |
| 3556 staticpro (&initial_obarray); | |
| 3557 /* Intern nil in the obarray */ | |
| 3558 { | |
| 793 | 3559 unsigned int hash = hash_string (XSTRING_DATA (XSYMBOL (Qnil)->name), 3); |
| 428 | 3560 XVECTOR_DATA (Vobarray)[hash % OBARRAY_SIZE] = Qnil; |
| 3561 } | |
| 3562 | |
| 3563 { | |
| 3564 /* Required to get around a GCC syntax error on certain | |
| 3565 architectures */ | |
| 3263 | 3566 #ifdef NEW_GC |
| 2720 | 3567 struct symbol_value_magic *tem = (struct symbol_value_magic *) |
| 3568 mc_alloc (sizeof (struct symbol_value_magic)); | |
| 3569 MARK_LRECORD_AS_LISP_READONLY (tem); | |
| 3570 MARK_LRECORD_AS_NOT_FREE (tem); | |
| 3571 tem->header.type = lrecord_type_symbol_value_forward; | |
| 3572 mcpro (wrap_pointer_1 (tem)); | |
| 3573 tem->value = 0; | |
| 3574 tem->type = SYMVAL_UNBOUND_MARKER; | |
| 2994 | 3575 #ifdef ALLOC_TYPE_STATS |
| 2775 | 3576 inc_lrecord_stats (sizeof (struct symbol_value_magic), |
| 3577 (const struct lrecord_header *) tem); | |
| 2994 | 3578 #endif /* ALLOC_TYPE_STATS */ |
| 3263 | 3579 #else /* not NEW_GC */ |
| 442 | 3580 const struct symbol_value_magic *tem = &guts_of_unbound_marker; |
| 3263 | 3581 #endif /* not NEW_GC */ |
| 428 | 3582 |
| 793 | 3583 Qunbound = wrap_symbol_value_magic (tem); |
| 428 | 3584 } |
| 3585 | |
| 3586 XSYMBOL (Qnil)->function = Qunbound; | |
| 3587 | |
| 563 | 3588 DEFSYMBOL (Qt); |
| 444 | 3589 XSYMBOL (Qt)->value = Qt; /* Veritas aeterna */ |
| 428 | 3590 Vquit_flag = Qnil; |
| 3591 | |
| 1204 | 3592 dump_add_root_lisp_object (&Qnil); |
| 3593 dump_add_root_lisp_object (&Qunbound); | |
| 3594 dump_add_root_lisp_object (&Vquit_flag); | |
| 428 | 3595 } |
| 3596 | |
| 3597 void | |
| 1204 | 3598 reinit_symbols_early (void) |
| 440 | 3599 { |
|
5157
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redo memory-usage mechanism, add way of dynamically initializing Lisp objects
Ben Wing <ben@xemacs.org>
parents:
5146
diff
changeset
|
3600 reinit_symbol_objects_early (); |
| 440 | 3601 } |
| 3602 | |
| 442 | 3603 static void |
|
4979
4234fd5a7b17
fix bug #668 (compile error, not --with-debug)
Ben Wing <ben@xemacs.org>
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4971
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|
3604 defsymbol_massage_name_1 (Lisp_Object *location, const Ascbyte *name, |
|
4234fd5a7b17
fix bug #668 (compile error, not --with-debug)
Ben Wing <ben@xemacs.org>
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4971
diff
changeset
|
3605 int dump_p, int multiword_predicate_p) |
| 442 | 3606 { |
| 3607 char temp[500]; | |
| 3608 int len = strlen (name) - 1; | |
| 3609 int i; | |
| 3610 | |
| 3611 if (multiword_predicate_p) | |
| 647 | 3612 assert (len + 1 < (int) sizeof (temp)); |
| 442 | 3613 else |
| 647 | 3614 assert (len < (int) sizeof (temp)); |
| 442 | 3615 strcpy (temp, name + 1); /* Remove initial Q */ |
| 3616 if (multiword_predicate_p) | |
| 3617 { | |
| 3618 strcpy (temp + len - 1, "_p"); | |
| 3619 len++; | |
| 3620 } | |
| 3621 for (i = 0; i < len; i++) | |
| 3622 if (temp[i] == '_') | |
| 3623 temp[i] = '-'; | |
| 867 | 3624 *location = Fintern (make_string ((const Ibyte *) temp, len), Qnil); |
| 442 | 3625 if (dump_p) |
|
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bcdf496e49d0
put back patch to get more informative staticpro debugging
Ben Wing <ben@xemacs.org>
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4969
diff
changeset
|
3626 staticpro_1 (location, name); |
| 442 | 3627 else |
|
4971
bcdf496e49d0
put back patch to get more informative staticpro debugging
Ben Wing <ben@xemacs.org>
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4969
diff
changeset
|
3628 staticpro_nodump_1 (location, name); |
| 442 | 3629 } |
| 3630 | |
| 440 | 3631 void |
|
4952
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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4940
diff
changeset
|
3632 defsymbol_massage_name_nodump (Lisp_Object *location, const Ascbyte *name) |
| 442 | 3633 { |
| 3634 defsymbol_massage_name_1 (location, name, 0, 0); | |
| 3635 } | |
| 3636 | |
| 3637 void | |
|
4952
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Mule-izing, various fixes related to char * arguments
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4940
diff
changeset
|
3638 defsymbol_massage_name (Lisp_Object *location, const Ascbyte *name) |
| 428 | 3639 { |
| 442 | 3640 defsymbol_massage_name_1 (location, name, 1, 0); |
| 3641 } | |
| 3642 | |
| 3643 void | |
| 3644 defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location, | |
|
4952
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Mule-izing, various fixes related to char * arguments
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diff
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|
3645 const Ascbyte *name) |
| 442 | 3646 { |
| 3647 defsymbol_massage_name_1 (location, name, 0, 1); | |
| 3648 } | |
| 3649 | |
| 3650 void | |
|
4979
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fix bug #668 (compile error, not --with-debug)
Ben Wing <ben@xemacs.org>
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|
3651 defsymbol_massage_multiword_predicate (Lisp_Object *location, |
|
4234fd5a7b17
fix bug #668 (compile error, not --with-debug)
Ben Wing <ben@xemacs.org>
parents:
4971
diff
changeset
|
3652 const Ascbyte *name) |
| 442 | 3653 { |
| 3654 defsymbol_massage_name_1 (location, name, 1, 1); | |
| 3655 } | |
| 3656 | |
| 3657 void | |
|
4952
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Mule-izing, various fixes related to char * arguments
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|
3658 defsymbol_nodump (Lisp_Object *location, const Ascbyte *name) |
| 442 | 3659 { |
| 867 | 3660 *location = Fintern (make_string_nocopy ((const Ibyte *) name, |
| 428 | 3661 strlen (name)), |
| 3662 Qnil); | |
|
4971
bcdf496e49d0
put back patch to get more informative staticpro debugging
Ben Wing <ben@xemacs.org>
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4969
diff
changeset
|
3663 staticpro_nodump_1 (location, name); |
| 428 | 3664 } |
| 3665 | |
| 3666 void | |
|
4952
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Mule-izing, various fixes related to char * arguments
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diff
changeset
|
3667 defsymbol (Lisp_Object *location, const Ascbyte *name) |
| 428 | 3668 { |
| 867 | 3669 *location = Fintern (make_string_nocopy ((const Ibyte *) name, |
| 428 | 3670 strlen (name)), |
| 3671 Qnil); | |
|
4971
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put back patch to get more informative staticpro debugging
Ben Wing <ben@xemacs.org>
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diff
changeset
|
3672 staticpro_1 (location, name); |
| 428 | 3673 } |
| 3674 | |
| 3675 void | |
|
4952
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Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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changeset
|
3676 defkeyword (Lisp_Object *location, const Ascbyte *name) |
| 428 | 3677 { |
| 3678 defsymbol (location, name); | |
| 3679 Fset (*location, *location); | |
| 3680 } | |
| 3681 | |
| 442 | 3682 void |
|
4952
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Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
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|
3683 defkeyword_massage_name (Lisp_Object *location, const Ascbyte *name) |
| 442 | 3684 { |
| 3685 char temp[500]; | |
| 3686 int len = strlen (name); | |
| 3687 | |
| 647 | 3688 assert (len < (int) sizeof (temp)); |
| 442 | 3689 strcpy (temp, name); |
| 3690 temp[1] = ':'; /* it's an underscore in the C variable */ | |
| 3691 | |
| 3692 defsymbol_massage_name (location, temp); | |
| 3693 Fset (*location, *location); | |
| 3694 } | |
| 3695 | |
| 428 | 3696 #ifdef DEBUG_XEMACS |
| 930 | 3697 /* Check that nobody spazzed writing a builtin (non-module) DEFUN. */ |
| 428 | 3698 static void |
| 3699 check_sane_subr (Lisp_Subr *subr, Lisp_Object sym) | |
| 3700 { | |
| 930 | 3701 if (!initialized) { |
| 3702 assert (subr->min_args >= 0); | |
| 3703 assert (subr->min_args <= SUBR_MAX_ARGS); | |
| 3704 | |
| 3705 if (subr->max_args != MANY && | |
| 3706 subr->max_args != UNEVALLED) | |
| 3707 { | |
| 3708 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ | |
| 3709 assert (subr->max_args <= SUBR_MAX_ARGS); | |
| 3710 assert (subr->min_args <= subr->max_args); | |
| 3711 } | |
| 3712 assert (UNBOUNDP (XSYMBOL (sym)->function)); | |
| 3713 } | |
| 428 | 3714 } |
| 3715 #else | |
| 3716 #define check_sane_subr(subr, sym) /* nothing */ | |
| 3717 #endif | |
| 3718 | |
| 3719 #ifdef HAVE_SHLIB | |
| 3263 | 3720 #ifndef NEW_GC |
| 428 | 3721 /* |
| 3722 * If we are not in a pure undumped Emacs, we need to make a duplicate of | |
| 3723 * the subr. This is because the only time this function will be called | |
| 3724 * in a running Emacs is when a dynamically loaded module is adding a | |
| 3725 * subr, and we need to make sure that the subr is in allocated, Lisp- | |
| 3726 * accessible memory. The address assigned to the static subr struct | |
| 3727 * in the shared object will be a trampoline address, so we need to create | |
| 3728 * a copy here to ensure that a real address is used. | |
| 3729 * | |
| 3730 * Once we have copied everything across, we re-use the original static | |
| 3731 * structure to store a pointer to the newly allocated one. This will be | |
| 3732 * used in emodules.c by emodules_doc_subr() to find a pointer to the | |
| 442 | 3733 * allocated object so that we can set its doc string properly. |
| 428 | 3734 * |
| 442 | 3735 * NOTE: We don't actually use the DOC pointer here any more, but we did |
| 428 | 3736 * in an earlier implementation of module support. There is no harm in |
| 3737 * setting it here in case we ever need it in future implementations. | |
| 3738 * subr->doc will point to the new subr structure that was allocated. | |
| 442 | 3739 * Code can then get this value from the static subr structure and use |
| 428 | 3740 * it if required. |
| 3741 * | |
| 442 | 3742 * FIXME: Should newsubr be staticpro()'ed? I don't think so but I need |
| 428 | 3743 * a guru to check. |
| 3744 */ | |
| 930 | 3745 #define check_module_subr(subr) \ |
| 3746 do { \ | |
| 3747 if (initialized) { \ | |
| 3748 Lisp_Subr *newsubr; \ | |
| 3749 Lisp_Object f; \ | |
| 3750 \ | |
| 3751 if (subr->min_args < 0) \ | |
| 3752 signal_ferror (Qdll_error, "%s min_args (%hd) too small", \ | |
| 3753 subr_name (subr), subr->min_args); \ | |
| 3754 if (subr->min_args > SUBR_MAX_ARGS) \ | |
| 3755 signal_ferror (Qdll_error, "%s min_args (%hd) too big (max = %d)", \ | |
| 3756 subr_name (subr), subr->min_args, SUBR_MAX_ARGS); \ | |
| 3757 \ | |
| 3758 if (subr->max_args != MANY && \ | |
| 3759 subr->max_args != UNEVALLED) \ | |
| 3760 { \ | |
| 3761 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ \ | |
| 3762 if (subr->max_args > SUBR_MAX_ARGS) \ | |
| 3763 signal_ferror (Qdll_error, "%s max_args (%hd) too big (max = %d)", \ | |
| 3764 subr_name (subr), subr->max_args, SUBR_MAX_ARGS); \ | |
| 3765 if (subr->min_args > subr->max_args) \ | |
| 3766 signal_ferror (Qdll_error, "%s min_args (%hd) > max_args (%hd)", \ | |
| 3767 subr_name (subr), subr->min_args, subr->max_args); \ | |
| 3768 } \ | |
| 3769 \ | |
| 3770 f = XSYMBOL (sym)->function; \ | |
| 3771 if (!UNBOUNDP (f) && (!CONSP (f) || !EQ (XCAR (f), Qautoload))) \ | |
| 3772 signal_ferror (Qdll_error, "Attempt to redefine %s", subr_name (subr)); \ | |
| 3773 \ | |
| 2367 | 3774 newsubr = xnew (Lisp_Subr); \ |
| 930 | 3775 memcpy (newsubr, subr, sizeof (Lisp_Subr)); \ |
|
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diff
changeset
|
3776 subr->doc = (const CIbyte *)newsubr; \ |
| 930 | 3777 subr = newsubr; \ |
| 3778 } \ | |
| 428 | 3779 } while (0) |
| 3263 | 3780 #else /* NEW_GC */ |
| 2963 | 3781 /* |
| 3782 * If we have the new allocator enabled, we do not need to make a | |
| 3783 * duplicate of the subr. The new allocator already does allocate all | |
| 3784 * subrs in Lisp-accessible memory rather than have it in the static | |
| 3785 * subr struct. | |
| 3786 * | |
| 3787 * NOTE: The DOC pointer is not set here as described above. | |
| 3788 */ | |
| 3789 #define check_module_subr(subr) \ | |
| 3790 do { \ | |
| 3791 if (initialized) { \ | |
| 3792 Lisp_Object f; \ | |
| 3793 \ | |
| 3794 if (subr->min_args < 0) \ | |
| 3795 signal_ferror (Qdll_error, "%s min_args (%hd) too small", \ | |
| 3796 subr_name (subr), subr->min_args); \ | |
| 3797 if (subr->min_args > SUBR_MAX_ARGS) \ | |
| 3798 signal_ferror (Qdll_error, "%s min_args (%hd) too big (max = %d)", \ | |
| 3799 subr_name (subr), subr->min_args, SUBR_MAX_ARGS); \ | |
| 3800 \ | |
| 3801 if (subr->max_args != MANY && \ | |
| 3802 subr->max_args != UNEVALLED) \ | |
| 3803 { \ | |
| 3804 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ \ | |
| 3805 if (subr->max_args > SUBR_MAX_ARGS) \ | |
| 3806 signal_ferror (Qdll_error, "%s max_args (%hd) too big (max = %d)", \ | |
| 3807 subr_name (subr), subr->max_args, SUBR_MAX_ARGS); \ | |
| 3808 if (subr->min_args > subr->max_args) \ | |
| 3809 signal_ferror (Qdll_error, "%s min_args (%hd) > max_args (%hd)", \ | |
| 3810 subr_name (subr), subr->min_args, subr->max_args); \ | |
| 3811 } \ | |
| 3812 \ | |
| 3813 f = XSYMBOL (sym)->function; \ | |
| 3814 if (!UNBOUNDP (f) && (!CONSP (f) || !EQ (XCAR (f), Qautoload))) \ | |
| 3815 signal_ferror (Qdll_error, "Attempt to redefine %s", subr_name (subr)); \ | |
| 3816 } \ | |
| 3817 } while (0) | |
| 3263 | 3818 #endif /* NEW_GC */ |
| 428 | 3819 #else /* ! HAVE_SHLIB */ |
| 930 | 3820 #define check_module_subr(subr) |
| 428 | 3821 #endif |
| 3822 | |
| 3823 void | |
| 3824 defsubr (Lisp_Subr *subr) | |
| 3825 { | |
| 3826 Lisp_Object sym = intern (subr_name (subr)); | |
| 3827 Lisp_Object fun; | |
| 3828 | |
| 3829 check_sane_subr (subr, sym); | |
| 930 | 3830 check_module_subr (subr); |
| 428 | 3831 |
| 793 | 3832 fun = wrap_subr (subr); |
| 428 | 3833 XSYMBOL (sym)->function = fun; |
| 996 | 3834 |
| 3835 #ifdef HAVE_SHLIB | |
| 3836 /* If it is declared in a module, update the load history */ | |
| 3837 if (initialized) | |
| 3838 LOADHIST_ATTACH (sym); | |
| 3839 #endif | |
| 428 | 3840 } |
| 3841 | |
| 3842 /* Define a lisp macro using a Lisp_Subr. */ | |
| 3843 void | |
| 3844 defsubr_macro (Lisp_Subr *subr) | |
| 3845 { | |
| 3846 Lisp_Object sym = intern (subr_name (subr)); | |
| 3847 Lisp_Object fun; | |
| 3848 | |
| 3849 check_sane_subr (subr, sym); | |
| 930 | 3850 check_module_subr (subr); |
| 428 | 3851 |
| 793 | 3852 fun = wrap_subr (subr); |
| 428 | 3853 XSYMBOL (sym)->function = Fcons (Qmacro, fun); |
| 996 | 3854 |
| 3855 #ifdef HAVE_SHLIB | |
| 3856 /* If it is declared in a module, update the load history */ | |
| 3857 if (initialized) | |
| 3858 LOADHIST_ATTACH (sym); | |
| 3859 #endif | |
| 428 | 3860 } |
| 3861 | |
| 442 | 3862 static void |
|
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|
3863 deferror_1 (Lisp_Object *symbol, const Ascbyte *name, const Ascbyte *messuhhj, |
| 442 | 3864 Lisp_Object inherits_from, int massage_p) |
| 428 | 3865 { |
| 3866 Lisp_Object conds; | |
| 442 | 3867 if (massage_p) |
| 3868 defsymbol_massage_name (symbol, name); | |
| 3869 else | |
| 3870 defsymbol (symbol, name); | |
| 428 | 3871 |
| 3872 assert (SYMBOLP (inherits_from)); | |
| 3873 conds = Fget (inherits_from, Qerror_conditions, Qnil); | |
| 3874 Fput (*symbol, Qerror_conditions, Fcons (*symbol, conds)); | |
| 771 | 3875 /* NOT build_msg_string (). This function is called at load time |
| 428 | 3876 and the string needs to get translated at run time. (This happens |
| 3877 in the function (display-error) in cmdloop.el.) */ | |
|
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changeset
|
3878 Fput (*symbol, Qerror_message, build_defer_string (messuhhj)); |
| 428 | 3879 } |
| 3880 | |
| 3881 void | |
|
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changeset
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3882 deferror (Lisp_Object *symbol, const Ascbyte *name, const Ascbyte *messuhhj, |
| 442 | 3883 Lisp_Object inherits_from) |
| 3884 { | |
| 3885 deferror_1 (symbol, name, messuhhj, inherits_from, 0); | |
| 3886 } | |
| 3887 | |
| 3888 void | |
|
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|
3889 deferror_massage_name (Lisp_Object *symbol, const Ascbyte *name, |
|
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diff
changeset
|
3890 const Ascbyte *messuhhj, Lisp_Object inherits_from) |
| 442 | 3891 { |
| 3892 deferror_1 (symbol, name, messuhhj, inherits_from, 1); | |
| 3893 } | |
| 3894 | |
| 3895 void | |
|
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|
3896 deferror_massage_name_and_message (Lisp_Object *symbol, const Ascbyte *name, |
| 442 | 3897 Lisp_Object inherits_from) |
| 3898 { | |
| 3899 char temp[500]; | |
| 3900 int i; | |
| 3901 int len = strlen (name) - 1; | |
| 3902 | |
| 647 | 3903 assert (len < (int) sizeof (temp)); |
| 442 | 3904 strcpy (temp, name + 1); /* Remove initial Q */ |
| 3905 temp[0] = toupper (temp[0]); | |
| 3906 for (i = 0; i < len; i++) | |
| 3907 if (temp[i] == '_') | |
| 3908 temp[i] = ' '; | |
| 3909 | |
| 3910 deferror_1 (symbol, name, temp, inherits_from, 1); | |
| 3911 } | |
| 3912 | |
| 3913 void | |
| 428 | 3914 syms_of_symbols (void) |
| 3915 { | |
| 442 | 3916 DEFSYMBOL (Qvariable_documentation); |
| 3917 DEFSYMBOL (Qvariable_domain); /* I18N3 */ | |
| 3918 DEFSYMBOL (Qad_advice_info); | |
| 3919 DEFSYMBOL (Qad_activate); | |
| 3920 | |
| 3921 DEFSYMBOL (Qget_value); | |
| 3922 DEFSYMBOL (Qset_value); | |
| 3923 DEFSYMBOL (Qbound_predicate); | |
| 3924 DEFSYMBOL (Qmake_unbound); | |
| 3925 DEFSYMBOL (Qlocal_predicate); | |
| 3926 DEFSYMBOL (Qmake_local); | |
| 3927 | |
| 3928 DEFSYMBOL (Qboundp); | |
| 3929 DEFSYMBOL (Qglobally_boundp); | |
| 3930 DEFSYMBOL (Qmakunbound); | |
| 3931 DEFSYMBOL (Qsymbol_value); | |
| 3932 DEFSYMBOL (Qset); | |
| 3933 DEFSYMBOL (Qsetq_default); | |
| 3934 DEFSYMBOL (Qdefault_boundp); | |
| 3935 DEFSYMBOL (Qdefault_value); | |
| 3936 DEFSYMBOL (Qset_default); | |
| 3937 DEFSYMBOL (Qmake_variable_buffer_local); | |
| 3938 DEFSYMBOL (Qmake_local_variable); | |
| 3939 DEFSYMBOL (Qkill_local_variable); | |
| 3940 DEFSYMBOL (Qkill_console_local_variable); | |
| 3941 DEFSYMBOL (Qsymbol_value_in_buffer); | |
| 3942 DEFSYMBOL (Qsymbol_value_in_console); | |
| 3943 DEFSYMBOL (Qlocal_variable_p); | |
| 3944 DEFSYMBOL (Qconst_integer); | |
| 3945 DEFSYMBOL (Qconst_boolean); | |
| 3946 DEFSYMBOL (Qconst_object); | |
| 3947 DEFSYMBOL (Qconst_specifier); | |
| 3948 DEFSYMBOL (Qdefault_buffer); | |
| 3949 DEFSYMBOL (Qcurrent_buffer); | |
| 3950 DEFSYMBOL (Qconst_current_buffer); | |
| 3951 DEFSYMBOL (Qdefault_console); | |
| 3952 DEFSYMBOL (Qselected_console); | |
| 3953 DEFSYMBOL (Qconst_selected_console); | |
| 428 | 3954 |
| 3955 DEFSUBR (Fintern); | |
| 3956 DEFSUBR (Fintern_soft); | |
| 3957 DEFSUBR (Funintern); | |
| 3958 DEFSUBR (Fmapatoms); | |
| 3959 DEFSUBR (Fapropos_internal); | |
| 3960 | |
| 3961 DEFSUBR (Fsymbol_function); | |
| 3962 DEFSUBR (Fsymbol_plist); | |
| 3963 DEFSUBR (Fsymbol_name); | |
| 3964 DEFSUBR (Fmakunbound); | |
| 3965 DEFSUBR (Ffmakunbound); | |
| 3966 DEFSUBR (Fboundp); | |
| 3967 DEFSUBR (Fglobally_boundp); | |
| 3968 DEFSUBR (Ffboundp); | |
| 3969 DEFSUBR (Ffset); | |
| 3970 DEFSUBR (Fdefine_function); | |
| 3971 Ffset (intern ("defalias"), intern ("define-function")); | |
| 3368 | 3972 DEFSUBR (Fsubr_name); |
|
4905
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diff
changeset
|
3973 DEFSUBR (Fspecial_operator_p); |
| 428 | 3974 DEFSUBR (Fsetplist); |
| 3975 DEFSUBR (Fsymbol_value_in_buffer); | |
| 3976 DEFSUBR (Fsymbol_value_in_console); | |
| 3977 DEFSUBR (Fbuilt_in_variable_type); | |
| 3978 DEFSUBR (Fsymbol_value); | |
| 3979 DEFSUBR (Fset); | |
| 3980 DEFSUBR (Fdefault_boundp); | |
| 3981 DEFSUBR (Fdefault_value); | |
| 3982 DEFSUBR (Fset_default); | |
| 3983 DEFSUBR (Fsetq_default); | |
| 3984 DEFSUBR (Fmake_variable_buffer_local); | |
| 3985 DEFSUBR (Fmake_local_variable); | |
| 3986 DEFSUBR (Fkill_local_variable); | |
| 3987 DEFSUBR (Fkill_console_local_variable); | |
| 3988 DEFSUBR (Flocal_variable_p); | |
|
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diff
changeset
|
3989 DEFSUBR (Fcustom_variable_p); |
|
8748a3f7ceb4
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diff
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|
3990 DEFSUBR (Fuser_variable_p); |
| 428 | 3991 DEFSUBR (Fdefvaralias); |
| 3992 DEFSUBR (Fvariable_alias); | |
| 3993 DEFSUBR (Findirect_variable); | |
| 1674 | 3994 DEFSUBR (Fvariable_binding_locus); |
| 428 | 3995 DEFSUBR (Fdontusethis_set_symbol_value_handler); |
| 3996 } | |
| 3997 | |
| 3998 /* Create and initialize a Lisp variable whose value is forwarded to C data */ | |
| 3999 void | |
|
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|
4000 defvar_magic (const Ascbyte *symbol_name, |
|
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diff
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|
4001 const struct symbol_value_forward *magic) |
| 428 | 4002 { |
| 442 | 4003 Lisp_Object sym; |
| 428 | 4004 |
| 996 | 4005 #ifdef HAVE_SHLIB |
| 428 | 4006 /* |
| 4007 * As with defsubr(), this will only be called in a dumped Emacs when | |
| 4008 * we are adding variables from a dynamically loaded module. That means | |
| 4009 * we can't use purespace. Take that into account. | |
| 4010 */ | |
| 4011 if (initialized) | |
| 996 | 4012 { |
|
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changeset
|
4013 sym = Fintern (build_ascstring (symbol_name), Qnil); |
| 996 | 4014 LOADHIST_ATTACH (sym); |
| 4015 } | |
| 428 | 4016 else |
| 4017 #endif | |
| 867 | 4018 sym = Fintern (make_string_nocopy ((const Ibyte *) symbol_name, |
| 428 | 4019 strlen (symbol_name)), Qnil); |
| 4020 | |
| 793 | 4021 XSYMBOL (sym)->value = wrap_pointer_1 (magic); |
| 428 | 4022 } |
| 4023 | |
| 4024 void | |
| 4025 vars_of_symbols (void) | |
| 4026 { | |
| 4027 DEFVAR_LISP ("obarray", &Vobarray /* | |
| 4028 Symbol table for use by `intern' and `read'. | |
| 4029 It is a vector whose length ought to be prime for best results. | |
| 4030 The vector's contents don't make sense if examined from Lisp programs; | |
| 4031 to find all the symbols in an obarray, use `mapatoms'. | |
| 4032 */ ); | |
| 4033 /* obarray has been initialized long before */ | |
| 4034 } |