libguile/tag.c

   1 /*      Copyright (C) 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 #include <stdio.h>
  43 #include "_scm.h"
  44 #include "chars.h"
  45 #include "struct.h"
  46
  47 #include "tag.h"
  48 \f
  49
  50 SCM_CONST_LONG (scm_utag_immediate_integer, "utag_immediate_integer", 0);
  51 SCM_CONST_LONG (scm_utag_immediate_char, "utag_immediate_char", 1);
  52 SCM_CONST_LONG (scm_utag_pair, "utag_pair", 2);
  53 SCM_CONST_LONG (scm_utag_closure, "utag_closure", 3);
  54 SCM_CONST_LONG (scm_utag_symbol, "utag_symbol", 4);
  55 SCM_CONST_LONG (scm_utag_vector, "utag_vector", 5);
  56 SCM_CONST_LONG (scm_utag_wvect, "utag_wvect", 6);
  57 SCM_CONST_LONG (scm_utag_bvect, "utag_bvect", 7);
  58 SCM_CONST_LONG (scm_utag_byvect, "utag_byvect", 8);
  59 SCM_CONST_LONG (scm_utag_svect, "utag_svect", 9);
  60 SCM_CONST_LONG (scm_utag_ivect, "utag_ivect", 10);
  61 SCM_CONST_LONG (scm_utag_uvect, "utag_uvect", 11);
  62 SCM_CONST_LONG (scm_utag_fvect, "utag_fvect", 12);
  63 SCM_CONST_LONG (scm_utag_dvect, "utag_dvect", 13);
  64 SCM_CONST_LONG (scm_utag_cvect, "utag_cvect", 14);
  65 SCM_CONST_LONG (scm_utag_string, "utag_string", 15);
  66 SCM_CONST_LONG (scm_utag_substring, "utag_substring", 17);
  67 SCM_CONST_LONG (scm_utag_asubr, "utag_asubr", 19);
  68 SCM_CONST_LONG (scm_utag_subr_0, "utag_subr_0", 20);
  69 SCM_CONST_LONG (scm_utag_subr_1, "utag_subr_1", 21);
  70 SCM_CONST_LONG (scm_utag_cxr, "utag_cxr", 22);
  71 SCM_CONST_LONG (scm_utag_subr_3, "utag_subr_3", 23);
  72 SCM_CONST_LONG (scm_utag_subr_2, "utag_subr_2", 24);
  73 SCM_CONST_LONG (scm_utag_rpsubr, "utag_rpsubr", 25);
  74 SCM_CONST_LONG (scm_utag_subr_1o, "utag_subr_1o", 26);
  75 SCM_CONST_LONG (scm_utag_subr_2o, "utag_subr_2o", 27);
  76 SCM_CONST_LONG (scm_utag_lsubr_2, "utag_lsubr_2", 28);
  77 SCM_CONST_LONG (scm_utag_lsubr, "utag_lsubr", 29);
  78 SCM_CONST_LONG (scm_utag_smob_base, "utag_smob_base", 252);
  79 SCM_CONST_LONG (scm_utag_port_base, "utag_port_base", 253);
  80 SCM_CONST_LONG (scm_utag_flag_base, "utag_flag_base", 254);
  81 SCM_CONST_LONG (scm_utag_struct_base, "utag_struct_base", 255);
  82
  83
  84 SCM_PROC (s_tag, "tag", 1, 0, 0, scm_tag);
  85
  86 SCM
  87 scm_tag (x)
  88      SCM x;
  89 {
  90   switch (SCM_ITAG3 (x))
  91     {
  92     case scm_tc3_int_1:
  93     case scm_tc3_int_2:
  94       return SCM_CDR (scm_utag_immediate_integer) ;
  95
  96     case scm_tc3_imm24:
  97       if (SCM_ICHRP (x))
  98         return SCM_CDR (scm_utag_immediate_char) ;
  99       else
 100         {
 101           int tag;
 102           tag = SCM_MAKINUM ((x >> 8) & 0xff);
 103           return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_flag_base) ) | (tag << 8));
 104         }
 105
 106     case scm_tc3_cons:
 107       switch (SCM_TYP7 (x))
 108         {
 109         case scm_tcs_cons_nimcar:
 110           return SCM_CDR (scm_utag_pair) ;
 111         case scm_tcs_closures:
 112           return SCM_CDR (scm_utag_closure) ;
 113         case scm_tcs_symbols:
 114           return SCM_CDR (scm_utag_symbol) ;
 115         case scm_tc7_vector:
 116           return SCM_CDR (scm_utag_vector) ;
 117         case scm_tc7_wvect:
 118           return SCM_CDR (scm_utag_wvect) ;
 119         case scm_tc7_bvect:
 120           return SCM_CDR (scm_utag_bvect) ;
 121         case scm_tc7_byvect:
 122           return SCM_CDR (scm_utag_byvect) ;
 123         case scm_tc7_svect:
 124           return SCM_CDR (scm_utag_svect) ;
 125         case scm_tc7_ivect:
 126           return SCM_CDR (scm_utag_ivect) ;
 127         case scm_tc7_uvect:
 128           return SCM_CDR (scm_utag_uvect) ;
 129         case scm_tc7_fvect:
 130           return SCM_CDR (scm_utag_fvect) ;
 131         case scm_tc7_dvect:
 132           return SCM_CDR (scm_utag_dvect) ;
 133         case scm_tc7_cvect:
 134           return SCM_CDR (scm_utag_cvect) ;
 135         case scm_tc7_string:
 136           return SCM_CDR (scm_utag_string) ;
 137         case scm_tc7_substring:
 138           return SCM_CDR (scm_utag_substring) ;
 139         case scm_tc7_asubr:
 140           return SCM_CDR (scm_utag_asubr) ;
 141         case scm_tc7_subr_0:
 142           return SCM_CDR (scm_utag_subr_0) ;
 143         case scm_tc7_subr_1:
 144           return SCM_CDR (scm_utag_subr_1) ;
 145         case scm_tc7_cxr:
 146           return SCM_CDR (scm_utag_cxr) ;
 147         case scm_tc7_subr_3:
 148           return SCM_CDR (scm_utag_subr_3) ;
 149         case scm_tc7_subr_2:
 150           return SCM_CDR (scm_utag_subr_2) ;
 151         case scm_tc7_rpsubr:
 152           return SCM_CDR (scm_utag_rpsubr) ;
 153         case scm_tc7_subr_1o:
 154           return SCM_CDR (scm_utag_subr_1o) ;
 155         case scm_tc7_subr_2o:
 156           return SCM_CDR (scm_utag_subr_2o) ;
 157         case scm_tc7_lsubr_2:
 158           return SCM_CDR (scm_utag_lsubr_2) ;
 159         case scm_tc7_lsubr:
 160           return SCM_CDR (scm_utag_lsubr) ;
 161
 162         case scm_tc7_port:
 163           {
 164             int tag;
 165             tag = (SCM_TYP16 (x) >> 8) & 0xff;
 166             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_port_base)) | (tag << 8));
 167           }
 168         case scm_tc7_smob:
 169           {
 170             int tag;
 171             tag = (SCM_TYP16 (x) >> 8) & 0xff;
 172             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_smob_base))
 173                                 | (tag << 8));
 174           }
 175         case scm_tcs_cons_gloc:
 176           /* must be a struct */
 177           {
 178             int tag = (int) SCM_STRUCT_VTABLE_DATA (x) >> 3;
 179             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_struct_base))
 180                                 | (tag << 8));
 181           }
 182
 183         default:
 184           if (SCM_CONSP (x))
 185             return SCM_CDR (scm_utag_pair);
 186           else
 187             return SCM_MAKINUM (-1);
 188         }
 189
 190     case scm_tc3_cons_gloc:
 191     case scm_tc3_tc7_1:
 192     case scm_tc3_tc7_2:
 193     case scm_tc3_closure:
 194       /* Never reached */
 195       break;
 196     }
 197   return SCM_MAKINUM (-1);
 198 }
 199
 200
 201 \f
 202
 203
 204 void
 205 scm_init_tag ()
 206 {
 207 #include "tag.x"
 208 }
 209