libguile/procs.c

   1 /*      Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 #include "objects.h"
  47
  48 #include "procs.h"
  49 \f
  50
  51
  52 /* {Procedures}
  53  */
  54
  55 scm_subr_entry *scm_subr_table;
  56
  57 /* libguile contained approx. 700 primitive procedures 990824. */
  58
  59 int scm_subr_table_size = 0;
  60 int scm_subr_table_room = 750;
  61
  62 SCM
  63 scm_make_subr_opt (name, type, fcn, set)
  64      const char *name;
  65      int type;
  66      SCM (*fcn) ();
  67      int set;
  68 {
  69   SCM symcell;
  70   register SCM z;
  71   int entry;
  72
  73   if (scm_subr_table_size == scm_subr_table_room)
  74     {
  75       scm_sizet new_size = scm_port_table_room * 3 / 2;
  76       void *new_table = scm_must_realloc ((char *) scm_subr_table,
  77                                           scm_subr_table_room,
  78                                           new_size,
  79                                           "scm_make_subr_opt");
  80       scm_subr_table = new_table;
  81       scm_subr_table_room = new_size;
  82     }
  83
  84   SCM_NEWCELL (z);
  85   symcell = set ? scm_sysintern0 (name) : scm_intern0 (name);
  86
  87   entry = scm_subr_table_size;
  88   scm_subr_table[entry].handle = z;
  89   scm_subr_table[entry].name = SCM_CAR (symcell);
  90   scm_subr_table[entry].generic = 0;
  91   scm_subr_table[entry].properties = SCM_EOL;
  92   scm_subr_table[entry].documentation = SCM_BOOL_F;
  93
  94   SCM_SUBRF (z) = fcn;
  95   SCM_SETCAR (z, (entry << 8) + type);
  96   scm_subr_table_size++;
  97
  98   if (set)
  99     SCM_SETCDR (symcell, z);
 100
 101   return z;
 102 }
 103
 104 /* This function isn't currently used since subrs are never freed. */
 105 /* *fixme* Need mutex here. */
 106 void
 107 scm_free_subr_entry (SCM subr)
 108 {
 109   int entry = SCM_SUBRNUM (subr);
 110   /* Move last entry in table to the free position */
 111   scm_subr_table[entry] = scm_subr_table[scm_subr_table_size - 1];
 112   SCM_SET_SUBRNUM (scm_subr_table[entry].handle, entry);
 113   scm_subr_table_size--;
 114 }
 115
 116 SCM
 117 scm_make_subr (name, type, fcn)
 118      const char *name;
 119      int type;
 120      SCM (*fcn) ();
 121 {
 122   return scm_make_subr_opt (name, type, fcn, 1);
 123 }
 124
 125 SCM
 126 scm_make_subr_with_generic (const char *name, int type, SCM (*fcn) (), SCM *gf)
 127 {
 128   SCM subr = scm_make_subr_opt (name, type, fcn, 1);
 129   scm_subr_table[scm_subr_table_size - 1].generic = gf;
 130   return subr;
 131 }
 132
 133 void
 134 scm_mark_subr_table ()
 135 {
 136   int i;
 137   for (i = 0; i < scm_subr_table_size; ++i)
 138     {
 139       SCM_SETGC8MARK (scm_subr_table[i].name);
 140       if (scm_subr_table[i].generic && *scm_subr_table[i].generic)
 141         scm_gc_mark (*scm_subr_table[i].generic);
 142       if (SCM_NIMP (scm_subr_table[i].properties))
 143         scm_gc_mark (scm_subr_table[i].properties);
 144       if (SCM_NIMP (scm_subr_table[i].documentation))
 145         scm_gc_mark (scm_subr_table[i].documentation);
 146     }
 147 }
 148
 149
 150 #ifdef CCLO
 151 SCM
 152 scm_makcclo (proc, len)
 153      SCM proc;
 154      long len;
 155 {
 156   SCM s;
 157   SCM_NEWCELL (s);
 158   SCM_DEFER_INTS;
 159   SCM_SETCHARS (s, scm_must_malloc (len * sizeof (SCM), "compiled-closure"));
 160   SCM_SETLENGTH (s, len, scm_tc7_cclo);
 161   while (--len)
 162     SCM_VELTS (s)[len] = SCM_UNSPECIFIED;
 163   SCM_CCLO_SUBR (s) = proc;
 164   SCM_ALLOW_INTS;
 165   return s;
 166 }
 167
 168 /* Undocumented debugging procedure */
 169 #ifdef GUILE_DEBUG
 170 SCM_PROC (s_make_cclo, "make-cclo", 2, 0, 0, scm_make_cclo);
 171
 172 SCM
 173 scm_make_cclo (proc, len)
 174      SCM proc;
 175      SCM len;
 176 {
 177   return scm_makcclo (proc, SCM_INUM (len));
 178 }
 179 #endif
 180 #endif
 181
 182
 183
 184 SCM_PROC(s_procedure_p, "procedure?", 1, 0, 0, scm_procedure_p);
 185
 186 SCM
 187 scm_procedure_p (obj)
 188      SCM obj;
 189 {
 190   if (SCM_NIMP (obj))
 191     switch (SCM_TYP7 (obj))
 192       {
 193       case scm_tcs_cons_gloc:
 194         if (!SCM_I_OPERATORP (obj))
 195           break;
 196       case scm_tcs_closures:
 197       case scm_tc7_contin:
 198       case scm_tcs_subrs:
 199 #ifdef CCLO
 200       case scm_tc7_cclo:
 201 #endif
 202       case scm_tc7_pws:
 203         return SCM_BOOL_T;
 204       default:
 205         return SCM_BOOL_F;
 206       }
 207   return SCM_BOOL_F;
 208 }
 209
 210 SCM_PROC(s_closure_p, "closure?", 1, 0, 0, scm_closure_p);
 211
 212 SCM
 213 scm_closure_p (obj)
 214      SCM obj;
 215 {
 216   return SCM_NIMP (obj) && SCM_CLOSUREP (obj) ? SCM_BOOL_T : SCM_BOOL_F;
 217 }
 218
 219 SCM_PROC(s_thunk_p, "thunk?", 1, 0, 0, scm_thunk_p);
 220
 221 #ifdef __STDC__
 222 SCM
 223 scm_thunk_p (SCM obj)
 224 #else
 225 SCM
 226 scm_thunk_p (obj)
 227      SCM obj;
 228 #endif
 229 {
 230   if (SCM_NIMP (obj))
 231     {
 232     again:
 233       switch (SCM_TYP7 (obj))
 234         {
 235         case scm_tcs_closures:
 236           if (SCM_NULLP (SCM_CAR (SCM_CODE (obj))))
 237             return SCM_BOOL_T;
 238         case scm_tc7_subr_0:
 239         case scm_tc7_subr_1o:
 240         case scm_tc7_lsubr:
 241         case scm_tc7_rpsubr:
 242         case scm_tc7_asubr:
 243 #ifdef CCLO
 244         case scm_tc7_cclo:
 245 #endif
 246           return SCM_BOOL_T;
 247         case scm_tc7_pws:
 248           obj = SCM_PROCEDURE (obj);
 249           goto again;
 250         default:
 251           ;
 252         }
 253     }
 254   return SCM_BOOL_F;
 255 }
 256
 257 /* Only used internally. */
 258 int
 259 scm_subr_p (SCM obj)
 260 {
 261   if (SCM_NIMP (obj))
 262     switch (SCM_TYP7 (obj))
 263       {
 264       case scm_tcs_subrs:
 265         return 1;
 266       default:
 267         ;
 268       }
 269   return 0;
 270 }
 271
 272 SCM_PROC(s_procedure_documentation, "procedure-documentation", 1, 0, 0, scm_procedure_documentation);
 273
 274 SCM
 275 scm_procedure_documentation (proc)
 276      SCM proc;
 277 {
 278   SCM code;
 279   SCM_ASSERT (SCM_BOOL_T == scm_procedure_p (proc) && SCM_NIMP (proc) && SCM_TYP7 (proc) != scm_tc7_contin,
 280           proc, SCM_ARG1, s_procedure_documentation);
 281   switch (SCM_TYP7 (proc))
 282     {
 283     case scm_tcs_closures:
 284       code = SCM_CDR (SCM_CODE (proc));
 285       if (SCM_IMP (SCM_CDR (code)))
 286         return SCM_BOOL_F;
 287       code = SCM_CAR (code);
 288       if (SCM_IMP (code))
 289         return SCM_BOOL_F;
 290       if (SCM_STRINGP (code))
 291         return code;
 292     default:
 293       return SCM_BOOL_F;
 294 /*
 295   case scm_tcs_subrs:
 296 #ifdef CCLO
 297   case scm_tc7_cclo:
 298 #endif
 299 */
 300     }
 301 }
 302
 303
 304 /* Procedure-with-setter
 305  */
 306
 307 SCM_PROC (s_procedure_with_setter_p, "procedure-with-setter?", 1, 0, 0, scm_procedure_with_setter_p);
 308
 309 SCM
 310 scm_procedure_with_setter_p (SCM obj)
 311 {
 312   return (SCM_NIMP (obj) && SCM_PROCEDURE_WITH_SETTER_P (obj)
 313           ? SCM_BOOL_T
 314           : SCM_BOOL_F);
 315 }
 316
 317 SCM_PROC (s_make_procedure_with_setter, "make-procedure-with-setter", 2, 0, 0, scm_make_procedure_with_setter);
 318
 319 SCM
 320 scm_make_procedure_with_setter (SCM procedure, SCM setter)
 321 {
 322   SCM z;
 323   SCM_ASSERT (SCM_NFALSEP (scm_procedure_p (procedure)),
 324               procedure, SCM_ARG1, s_make_procedure_with_setter);
 325   SCM_ASSERT (SCM_NFALSEP (scm_procedure_p (setter)),
 326               setter, SCM_ARG2, s_make_procedure_with_setter);
 327   SCM_NEWCELL (z);
 328   SCM_ENTER_A_SECTION;
 329   SCM_SETCDR (z, scm_cons (procedure, setter));
 330   SCM_SETCAR (z, scm_tc7_pws);
 331   SCM_EXIT_A_SECTION;
 332   return z;
 333 }
 334
 335 SCM_PROC (s_procedure, "procedure", 1, 0, 0, scm_procedure);
 336
 337 SCM
 338 scm_procedure (SCM proc)
 339 {
 340   SCM_ASSERT (SCM_NIMP (proc), proc, SCM_ARG1, s_procedure);
 341   if (SCM_PROCEDURE_WITH_SETTER_P (proc))
 342     return SCM_PROCEDURE (proc);
 343   else if (SCM_STRUCTP (proc))
 344     {
 345       SCM_ASSERT (SCM_I_OPERATORP (proc), proc, SCM_ARG1, s_procedure);
 346       return proc;
 347     }
 348   scm_wrong_type_arg (s_procedure, SCM_ARG1, proc);
 349   return 0; /* not reached */
 350 }
 351
 352 SCM_GPROC (s_setter, "setter", 1, 0, 0, scm_setter, g_setter);
 353
 354 SCM
 355 scm_setter (SCM proc)
 356 {
 357   SCM_GASSERT1 (SCM_NIMP (proc), g_setter, proc, SCM_ARG1, s_setter);
 358   if (SCM_PROCEDURE_WITH_SETTER_P (proc))
 359     return SCM_SETTER (proc);
 360   else if (SCM_STRUCTP (proc))
 361     {
 362       SCM_GASSERT1 (SCM_I_OPERATORP (proc),
 363                     g_setter, proc, SCM_ARG1, s_setter);
 364       return (SCM_I_ENTITYP (proc)
 365               ? SCM_ENTITY_SETTER (proc)
 366               : SCM_OPERATOR_SETTER (proc));
 367     }
 368   SCM_WTA_DISPATCH_1 (g_setter, proc, SCM_ARG1, s_setter);
 369   return 0;
 370 }
 371
 372
 373 void
 374 scm_init_iprocs(subra, type)
 375      const scm_iproc *subra;
 376      int type;
 377 {
 378   for(;subra->scm_string; subra++)
 379     scm_make_subr(subra->scm_string,
 380                   type,
 381                   subra->cproc);
 382 }
 383
 384
 385 void
 386 scm_init_subr_table ()
 387 {
 388   scm_subr_table
 389     = ((scm_subr_entry *)
 390        scm_must_malloc (sizeof (scm_subr_entry) * scm_subr_table_room,
 391                         "scm_subr_table"));
 392 }
 393
 394 void
 395 scm_init_procs ()
 396 {
 397 #include "procs.x"
 398 }