libguile/tag.c

   1 /*      Copyright (C) 1996 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, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42 #include <stdio.h>
  43 #include "_scm.h"
  44
  45 \f
  46
  47 SCM_CONST_LONG (scm_utag_immediate_integer, "utag_immediate_integer", 0);
  48 SCM_CONST_LONG (scm_utag_immediate_char, "utag_immediate_char", 1);
  49 SCM_CONST_LONG (scm_utag_pair, "utag_pair", 2);
  50 SCM_CONST_LONG (scm_utag_closure, "utag_closure", 3);
  51 SCM_CONST_LONG (scm_utag_symbol, "utag_symbol", 4);
  52 SCM_CONST_LONG (scm_utag_vector, "utag_vector", 5);
  53 SCM_CONST_LONG (scm_utag_wvect, "utag_wvect", 6);
  54 SCM_CONST_LONG (scm_utag_bvect, "utag_bvect", 7);
  55 SCM_CONST_LONG (scm_utag_byvect, "utag_byvect", 8);
  56 SCM_CONST_LONG (scm_utag_svect, "utag_svect", 9);
  57 SCM_CONST_LONG (scm_utag_ivect, "utag_ivect", 10);
  58 SCM_CONST_LONG (scm_utag_uvect, "utag_uvect", 11);
  59 SCM_CONST_LONG (scm_utag_fvect, "utag_fvect", 12);
  60 SCM_CONST_LONG (scm_utag_dvect, "utag_dvect", 13);
  61 SCM_CONST_LONG (scm_utag_cvect, "utag_cvect", 14);
  62 SCM_CONST_LONG (scm_utag_string, "utag_string", 15);
  63 SCM_CONST_LONG (scm_utag_mb_string, "utag_mb_string", 16);
  64 SCM_CONST_LONG (scm_utag_substring, "utag_substring", 17);
  65 SCM_CONST_LONG (scm_utag_mb_substring, "utag_mb_substring", 18);
  66 SCM_CONST_LONG (scm_utag_asubr, "utag_asubr", 19);
  67 SCM_CONST_LONG (scm_utag_subr_0, "utag_subr_0", 20);
  68 SCM_CONST_LONG (scm_utag_subr_1, "utag_subr_1", 21);
  69 SCM_CONST_LONG (scm_utag_cxr, "utag_cxr", 22);
  70 SCM_CONST_LONG (scm_utag_subr_3, "utag_subr_3", 23);
  71 SCM_CONST_LONG (scm_utag_subr_2, "utag_subr_2", 24);
  72 SCM_CONST_LONG (scm_utag_rpsubr, "utag_rpsubr", 25);
  73 SCM_CONST_LONG (scm_utag_subr_1o, "utag_subr_1o", 26);
  74 SCM_CONST_LONG (scm_utag_subr_2o, "utag_subr_2o", 27);
  75 SCM_CONST_LONG (scm_utag_lsubr_2, "utag_lsubr_2", 28);
  76 SCM_CONST_LONG (scm_utag_lsubr, "utag_lsubr", 29);
  77 SCM_CONST_LONG (scm_utag_smob_base, "utag_smob_base", 252);
  78 SCM_CONST_LONG (scm_utag_port_base, "utag_port_base", 253);
  79 SCM_CONST_LONG (scm_utag_flag_base, "utag_flag_base", 254);
  80 SCM_CONST_LONG (scm_utag_struct_base, "utag_struct_base", 255);
  81
  82
  83 SCM_PROC (s_tag, "tag", 1, 0, 0, scm_tag);
  84 #ifdef __STDC__
  85 SCM
  86 scm_tag (SCM x)
  87 #else
  88 SCM
  89 scm_tag (x)
  90      SCM x;
  91 #endif
  92 {
  93   switch (SCM_ITAG3 (x))
  94     {
  95     case scm_tc3_int_1:
  96     case scm_tc3_int_2:
  97       return SCM_CDR (scm_utag_immediate_integer) ;
  98
  99     case scm_tc3_imm24:
 100       if (SCM_ICHRP (x))
 101         return SCM_CDR (scm_utag_immediate_char) ;
 102       else
 103         {
 104           int tag;
 105           tag = SCM_MAKINUM ((x >> 8) & 0xff);
 106           return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_flag_base) ) | (tag << 8));
 107         }
 108
 109     case scm_tc3_cons:
 110       switch (SCM_TYP7 (x))
 111         {
 112         case scm_tcs_cons_nimcar:
 113           return SCM_CDR (scm_utag_pair) ;
 114         case scm_tcs_closures:
 115           return SCM_CDR (scm_utag_closure) ;
 116         case scm_tcs_symbols:
 117           return SCM_CDR (scm_utag_symbol) ;
 118         case scm_tc7_vector:
 119           return SCM_CDR (scm_utag_vector) ;
 120         case scm_tc7_wvect:
 121           return SCM_CDR (scm_utag_wvect) ;
 122         case scm_tc7_bvect:
 123           return SCM_CDR (scm_utag_bvect) ;
 124         case scm_tc7_byvect:
 125           return SCM_CDR (scm_utag_byvect) ;
 126         case scm_tc7_svect:
 127           return SCM_CDR (scm_utag_svect) ;
 128         case scm_tc7_ivect:
 129           return SCM_CDR (scm_utag_ivect) ;
 130         case scm_tc7_uvect:
 131           return SCM_CDR (scm_utag_uvect) ;
 132         case scm_tc7_fvect:
 133           return SCM_CDR (scm_utag_fvect) ;
 134         case scm_tc7_dvect:
 135           return SCM_CDR (scm_utag_dvect) ;
 136         case scm_tc7_cvect:
 137           return SCM_CDR (scm_utag_cvect) ;
 138         case scm_tc7_string:
 139           return SCM_CDR (scm_utag_string) ;
 140         case scm_tc7_mb_string:
 141           return SCM_CDR (scm_utag_mb_string) ;
 142         case scm_tc7_substring:
 143           return SCM_CDR (scm_utag_substring) ;
 144         case scm_tc7_mb_substring:
 145           return SCM_CDR (scm_utag_mb_substring) ;
 146         case scm_tc7_asubr:
 147           return SCM_CDR (scm_utag_asubr) ;
 148         case scm_tc7_subr_0:
 149           return SCM_CDR (scm_utag_subr_0) ;
 150         case scm_tc7_subr_1:
 151           return SCM_CDR (scm_utag_subr_1) ;
 152         case scm_tc7_cxr:
 153           return SCM_CDR (scm_utag_cxr) ;
 154         case scm_tc7_subr_3:
 155           return SCM_CDR (scm_utag_subr_3) ;
 156         case scm_tc7_subr_2:
 157           return SCM_CDR (scm_utag_subr_2) ;
 158         case scm_tc7_rpsubr:
 159           return SCM_CDR (scm_utag_rpsubr) ;
 160         case scm_tc7_subr_1o:
 161           return SCM_CDR (scm_utag_subr_1o) ;
 162         case scm_tc7_subr_2o:
 163           return SCM_CDR (scm_utag_subr_2o) ;
 164         case scm_tc7_lsubr_2:
 165           return SCM_CDR (scm_utag_lsubr_2) ;
 166         case scm_tc7_lsubr:
 167           return SCM_CDR (scm_utag_lsubr) ;
 168
 169         case scm_tc7_port:
 170           {
 171             int tag;
 172             tag = (SCM_TYP16 (x) >> 8) & 0xff;
 173             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_port_base)) | (tag << 8));
 174           }
 175         case scm_tc7_smob:
 176           {
 177             int tag;
 178             tag = (SCM_TYP16 (x) >> 8) & 0xff;
 179             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_smob_base)) | (tag << 8));
 180           }
 181         case scm_tcs_cons_gloc:
 182           /* must be a struct */
 183           {
 184             int tag;
 185             tag = SCM_STRUCT_VTABLE_DATA (x)[scm_struct_i_tag];
 186             return SCM_MAKINUM (SCM_INUM (SCM_CDR (scm_utag_struct_base)) | (tag << 8));
 187           }
 188           return SCM_CDR (scm_utag_struct_base) ;
 189
 190         default:
 191           if (SCM_CONSP (x))
 192             return SCM_CDR (scm_utag_pair);
 193           else
 194             return SCM_MAKINUM (-1);
 195         }
 196
 197     case scm_tc3_cons_gloc:
 198     case scm_tc3_tc7_1:
 199     case scm_tc3_tc7_2:
 200     case scm_tc3_closure:
 201       /* Never reached */
 202       break;
 203     }
 204   return SCM_MAKINUM (-1);
 205 }
 206
 207
 208 \f
 209
 210 #ifdef __STDC__
 211 void
 212 scm_init_tag (void)
 213 #else
 214 void
 215 scm_init_tag ()
 216 #endif
 217 {
 218 #include "tag.x"
 219 }
 220