libguile/smob.h

   1 /* classes: h_files */
   2
   3 #ifndef SMOBH
   4 #define SMOBH
   5 /*      Copyright (C) 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; 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  * As a special exception, the Free Software Foundation gives permission
  23  * for additional uses of the text contained in its release of GUILE.
  24  *
  25  * The exception is that, if you link the GUILE library with other files
  26  * to produce an executable, this does not by itself cause the
  27  * resulting executable to be covered by the GNU General Public License.
  28  * Your use of that executable is in no way restricted on account of
  29  * linking the GUILE library code into it.
  30  *
  31  * This exception does not however invalidate any other reasons why
  32  * the executable file might be covered by the GNU General Public License.
  33  *
  34  * This exception applies only to the code released by the
  35  * Free Software Foundation under the name GUILE.  If you copy
  36  * code from other Free Software Foundation releases into a copy of
  37  * GUILE, as the General Public License permits, the exception does
  38  * not apply to the code that you add in this way.  To avoid misleading
  39  * anyone as to the status of such modified files, you must delete
  40  * this exception notice from them.
  41  *
  42  * If you write modifications of your own for GUILE, it is your choice
  43  * whether to permit this exception to apply to your modifications.
  44  * If you do not wish that, delete this exception notice.  */
  45 \f
  46 #include "libguile/__scm.h"
  47 #include "libguile/print.h"
  48
  49 \f
  50 /* This is the internal representation of a smob type */
  51
  52 typedef struct scm_smob_descriptor
  53 {
  54   char *name;
  55   scm_sizet size;
  56   SCM (*mark) (SCM);
  57   scm_sizet (*free) (SCM);
  58   int (*print) (SCM exp, SCM port, scm_print_state *pstate);
  59   SCM (*equalp) (SCM, SCM);
  60   int gsubr_type;
  61   SCM (*apply) ();
  62   SCM (*apply_0) (SCM);
  63   SCM (*apply_1) (SCM, SCM);
  64   SCM (*apply_2) (SCM, SCM, SCM);
  65   SCM (*apply_3) (SCM, SCM, SCM, SCM);
  66 } scm_smob_descriptor;
  67
  68 \f
  69
  70 #define SCM_NEWSMOB(z, tc, data) \
  71 do { \
  72   SCM_NEWCELL (z); \
  73   SCM_SET_CELL_WORD_1 ((z), (data)); \
  74   SCM_SET_CELL_TYPE ((z), (tc)); \
  75 } while (0)
  76
  77 #define SCM_RETURN_NEWSMOB(tc, data) \
  78   do { SCM __SCM_smob_answer; \
  79        SCM_NEWSMOB (__SCM_smob_answer, (tc), (data)); \
  80        return __SCM_smob_answer; \
  81   } while (0)
  82
  83 #define SCM_NEWSMOB2(z, tc, data1, data2) \
  84 do { \
  85   SCM_NEWCELL2 (z); \
  86   SCM_SET_CELL_WORD_1 ((z), (data1)); \
  87   SCM_SET_CELL_WORD_2 ((z), (data2)); \
  88   SCM_SET_CELL_TYPE ((z), (tc)); \
  89 } while (0)
  90
  91 #define SCM_RETURN_NEWSMOB2(tc, data1, data2) \
  92   do { SCM __SCM_smob_answer; \
  93        SCM_NEWSMOB2 (__SCM_smob_answer, (tc), (data1), (data2)); \
  94        return __SCM_smob_answer; \
  95   } while (0)
  96
  97 #define SCM_NEWSMOB3(z, tc, data1, data2, data3) \
  98 do { \
  99   SCM_NEWCELL2 (z); \
 100   SCM_SET_CELL_WORD_1 ((z), (data1)); \
 101   SCM_SET_CELL_WORD_2 ((z), (data2)); \
 102   SCM_SET_CELL_WORD_3 ((z), (data3)); \
 103   SCM_SET_CELL_TYPE ((z), (tc)); \
 104 } while (0)
 105
 106 #define SCM_RETURN_NEWSMOB3(tc, data1, data2, data3) \
 107   do { SCM __SCM_smob_answer; \
 108        SCM_NEWSMOB3 (__SCM_smob_answer, (tc), (data1), (data2), (data3)); \
 109        return __SCM_smob_answer; \
 110   } while (0)
 111
 112
 113 #define SCM_SMOB_DATA(x)                (SCM_CELL_WORD_1 (x))
 114 #define SCM_SET_SMOB_DATA(x, data)      (SCM_SET_CELL_WORD_1 ((x), (data)))
 115 #define SCM_TC2SMOBNUM(x)               (0x0ff & ((x) >> 8))
 116 #define SCM_SMOBNUM(x)                  (SCM_TC2SMOBNUM (SCM_CELL_TYPE (x)))
 117 /* SCM_SMOBNAME can be 0 if name is missing */
 118 #define SCM_SMOBNAME(smobnum)           (scm_smobs[smobnum].name)
 119 #define SCM_SMOB_PREDICATE(tag, obj)    (SCM_NIMP (obj) \
 120                                          && SCM_TYP16 (obj) == (tag))
 121 #define SCM_SMOB_DESCRIPTOR(x)          (scm_smobs[SCM_SMOBNUM (x)])
 122
 123 extern int scm_numsmob;
 124 extern scm_smob_descriptor *scm_smobs;
 125
 126 \f
 127
 128 extern SCM scm_mark0 (SCM ptr);
 129 extern SCM scm_markcdr (SCM ptr);
 130 extern scm_sizet scm_free0 (SCM ptr);
 131 extern scm_sizet scm_smob_free (SCM obj);
 132 extern int scm_smob_print (SCM exp, SCM port, scm_print_state *pstate);
 133
 134 extern SCM scm_smob_apply_0 (SCM smob);
 135 extern SCM scm_smob_apply_1 (SCM smob, SCM a1);
 136 extern SCM scm_smob_apply_2 (SCM smob, SCM a1, SCM a2);
 137 extern SCM scm_smob_apply_3 (SCM smob, SCM a1, SCM a2, SCM rest);
 138
 139 /* The following set of functions is the standard way to create new
 140  * SMOB types.
 141  *
 142  * Create a type tag using `scm_make_smob_type', accept default values
 143  * for mark, free, print and/or equalp functions, or set your own
 144  * values using `scm_set_smob_xxx'.
 145  */
 146
 147 extern long scm_make_smob_type (char *name, scm_sizet size);
 148
 149 extern void scm_set_smob_mark (long tc, SCM (*mark) (SCM));
 150 extern void scm_set_smob_free (long tc, scm_sizet (*free) (SCM));
 151 extern void scm_set_smob_print (long tc, int (*print) (SCM,
 152                                                        SCM,
 153                                                        scm_print_state*));
 154 extern void scm_set_smob_equalp (long tc, SCM (*equalp) (SCM, SCM));
 155 extern void scm_set_smob_apply (long tc, SCM (*apply) (), int req, int opt, int rst);
 156
 157
 158 /* Functions for registering multiple handler functions simultaneously.
 159  *
 160  * (There is a discussion among the developers whether or not these
 161  *  should be deprecated in the future.)
 162  */
 163
 164 extern long scm_make_smob_type_mfpe (char *name, scm_sizet size,
 165                                     SCM (*mark) (SCM),
 166                                     scm_sizet (*free) (SCM),
 167                                     int (*print) (SCM, SCM, scm_print_state*),
 168                                     SCM (*equalp) (SCM, SCM));
 169
 170 extern void scm_set_smob_mfpe (long tc,
 171                                SCM (*mark) (SCM),
 172                                scm_sizet (*free) (SCM),
 173                                int (*print) (SCM, SCM, scm_print_state*),
 174                                SCM (*equalp) (SCM, SCM));
 175
 176 /* Function for creating smobs */
 177
 178 extern SCM scm_make_smob (long tc);
 179 extern void scm_smob_prehistory (void);
 180
 181 \f
 182
 183 #endif  /* SMOBH */
 184
 185 /*
 186   Local Variables:
 187   c-file-style: "gnu"
 188   End:
 189 */