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
  42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44
  45 \f
  46 #include <stdio.h>
  47 #include "_scm.h"
  48 #include "chars.h"
  49 #include "struct.h"
  50
  51 #include "tag.h"
  52 \f
  53
  54 SCM_CONST_LONG (scm_utag_immediate_integer, "utag_immediate_integer", 0);
  55 SCM_CONST_LONG (scm_utag_immediate_char, "utag_immediate_char", 1);
  56 SCM_CONST_LONG (scm_utag_pair, "utag_pair", 2);
  57 SCM_CONST_LONG (scm_utag_closure, "utag_closure", 3);
  58 SCM_CONST_LONG (scm_utag_symbol, "utag_symbol", 4);
  59 SCM_CONST_LONG (scm_utag_vector, "utag_vector", 5);
  60 SCM_CONST_LONG (scm_utag_wvect, "utag_wvect", 6);
  61
  62 #ifdef HAVE_ARRAYS
  63 SCM_CONST_LONG (scm_utag_bvect, "utag_bvect", 7);
  64 SCM_CONST_LONG (scm_utag_byvect, "utag_byvect", 8);
  65 SCM_CONST_LONG (scm_utag_svect, "utag_svect", 9);
  66 SCM_CONST_LONG (scm_utag_ivect, "utag_ivect", 10);
  67 SCM_CONST_LONG (scm_utag_uvect, "utag_uvect", 11);
  68 SCM_CONST_LONG (scm_utag_fvect, "utag_fvect", 12);
  69 SCM_CONST_LONG (scm_utag_dvect, "utag_dvect", 13);
  70 SCM_CONST_LONG (scm_utag_cvect, "utag_cvect", 14);
  71 #endif
  72
  73 SCM_CONST_LONG (scm_utag_string, "utag_string", 15);
  74 SCM_CONST_LONG (scm_utag_substring, "utag_substring", 17);
  75 SCM_CONST_LONG (scm_utag_asubr, "utag_asubr", 19);
  76 SCM_CONST_LONG (scm_utag_subr_0, "utag_subr_0", 20);
  77 SCM_CONST_LONG (scm_utag_subr_1, "utag_subr_1", 21);
  78 SCM_CONST_LONG (scm_utag_cxr, "utag_cxr", 22);
  79 SCM_CONST_LONG (scm_utag_subr_3, "utag_subr_3", 23);
  80 SCM_CONST_LONG (scm_utag_subr_2, "utag_subr_2", 24);
  81 SCM_CONST_LONG (scm_utag_rpsubr, "utag_rpsubr", 25);
  82 SCM_CONST_LONG (scm_utag_subr_1o, "utag_subr_1o", 26);
  83 SCM_CONST_LONG (scm_utag_subr_2o, "utag_subr_2o", 27);
  84 SCM_CONST_LONG (scm_utag_lsubr_2, "utag_lsubr_2", 28);
  85 SCM_CONST_LONG (scm_utag_lsubr, "utag_lsubr", 29);
  86 SCM_CONST_LONG (scm_utag_smob_base, "utag_smob_base", 252);
  87 SCM_CONST_LONG (scm_utag_port_base, "utag_port_base", 253);
  88 SCM_CONST_LONG (scm_utag_flag_base, "utag_flag_base", 254);
  89 SCM_CONST_LONG (scm_utag_struct_base, "utag_struct_base", 255);
  90
  91
  92 GUILE_PROC (scm_tag, "tag", 1, 0, 0,
  93             (SCM x),
  94 "")
  95 #define FUNC_NAME s_scm_tag
  96 {
  97   switch (SCM_ITAG3 (x))
  98     {
  99     case scm_tc3_int_1:
 100     case scm_tc3_int_2:
 101       return SCM_CDR (scm_utag_immediate_integer) ;
 102
 103     case scm_tc3_imm24:
 104       if (SCM_ICHRP (x))
 105         return SCM_CDR (scm_utag_immediate_char) ;
 106       else
 107         {
 108           int tag;
 109           tag = SCM_MAKINUM ((x >> 8) & 0xff);
 110           return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_flag_base) ) | (tag << 8));
 111         }
 112
 113     case scm_tc3_cons:
 114       switch (SCM_TYP7 (x))
 115         {
 116         case scm_tcs_cons_nimcar:
 117           return SCM_CDR (scm_utag_pair) ;
 118         case scm_tcs_closures:
 119           return SCM_CDR (scm_utag_closure) ;
 120         case scm_tcs_symbols:
 121           return SCM_CDR (scm_utag_symbol) ;
 122         case scm_tc7_vector:
 123           return SCM_CDR (scm_utag_vector) ;
 124         case scm_tc7_wvect:
 125           return SCM_CDR (scm_utag_wvect) ;
 126
 127 #ifdef HAVE_ARRAYS
 128         case scm_tc7_bvect:
 129           return SCM_CDR (scm_utag_bvect) ;
 130         case scm_tc7_byvect:
 131           return SCM_CDR (scm_utag_byvect) ;
 132         case scm_tc7_svect:
 133           return SCM_CDR (scm_utag_svect) ;
 134         case scm_tc7_ivect:
 135           return SCM_CDR (scm_utag_ivect) ;
 136         case scm_tc7_uvect:
 137           return SCM_CDR (scm_utag_uvect) ;
 138         case scm_tc7_fvect:
 139           return SCM_CDR (scm_utag_fvect) ;
 140         case scm_tc7_dvect:
 141           return SCM_CDR (scm_utag_dvect) ;
 142         case scm_tc7_cvect:
 143           return SCM_CDR (scm_utag_cvect) ;
 144 #endif
 145
 146         case scm_tc7_string:
 147           return SCM_CDR (scm_utag_string) ;
 148         case scm_tc7_substring:
 149           return SCM_CDR (scm_utag_substring) ;
 150         case scm_tc7_asubr:
 151           return SCM_CDR (scm_utag_asubr) ;
 152         case scm_tc7_subr_0:
 153           return SCM_CDR (scm_utag_subr_0) ;
 154         case scm_tc7_subr_1:
 155           return SCM_CDR (scm_utag_subr_1) ;
 156         case scm_tc7_cxr:
 157           return SCM_CDR (scm_utag_cxr) ;
 158         case scm_tc7_subr_3:
 159           return SCM_CDR (scm_utag_subr_3) ;
 160         case scm_tc7_subr_2:
 161           return SCM_CDR (scm_utag_subr_2) ;
 162         case scm_tc7_rpsubr:
 163           return SCM_CDR (scm_utag_rpsubr) ;
 164         case scm_tc7_subr_1o:
 165           return SCM_CDR (scm_utag_subr_1o) ;
 166         case scm_tc7_subr_2o:
 167           return SCM_CDR (scm_utag_subr_2o) ;
 168         case scm_tc7_lsubr_2:
 169           return SCM_CDR (scm_utag_lsubr_2) ;
 170         case scm_tc7_lsubr:
 171           return SCM_CDR (scm_utag_lsubr) ;
 172
 173         case scm_tc7_port:
 174           {
 175             int tag;
 176             tag = (SCM_TYP16 (x) >> 8) & 0xff;
 177             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_port_base)) | (tag << 8));
 178           }
 179         case scm_tc7_smob:
 180           {
 181             int tag;
 182             tag = (SCM_TYP16 (x) >> 8) & 0xff;
 183             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_smob_base))
 184                                 | (tag << 8));
 185           }
 186         case scm_tcs_cons_gloc:
 187           /* must be a struct */
 188           {
 189             int tag = (int) SCM_STRUCT_VTABLE_DATA (x) >> 3;
 190             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_struct_base))
 191                                 | (tag << 8));
 192           }
 193
 194         default:
 195           if (SCM_CONSP (x))
 196             return SCM_CDR (scm_utag_pair);
 197           else
 198             return SCM_MAKINUM (-1);
 199         }
 200
 201     case scm_tc3_cons_gloc:
 202     case scm_tc3_tc7_1:
 203     case scm_tc3_tc7_2:
 204     case scm_tc3_closure:
 205       /* Never reached */
 206       break;
 207     }
 208   return SCM_MAKINUM (-1);
 209 }
 210 #undef FUNC_NAME
 211
 212
 213 \f
 214
 215
 216 void
 217 scm_init_tag ()
 218 {
 219 #include "tag.x"
 220 }
 221