libguile/smob.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_SMOB_H
   4 #define SCM_SMOB_H
   5
   6 /* Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this software; see the file COPYING.  If not, write to
  20  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  21  * Boston, MA 02111-1307 USA
  22  *
  23  * As a special exception, the Free Software Foundation gives permission
  24  * for additional uses of the text contained in its release of GUILE.
  25  *
  26  * The exception is that, if you link the GUILE library with other files
  27  * to produce an executable, this does not by itself cause the
  28  * resulting executable to be covered by the GNU General Public License.
  29  * Your use of that executable is in no way restricted on account of
  30  * linking the GUILE library code into it.
  31  *
  32  * This exception does not however invalidate any other reasons why
  33  * the executable file might be covered by the GNU General Public License.
  34  *
  35  * This exception applies only to the code released by the
  36  * Free Software Foundation under the name GUILE.  If you copy
  37  * code from other Free Software Foundation releases into a copy of
  38  * GUILE, as the General Public License permits, the exception does
  39  * not apply to the code that you add in this way.  To avoid misleading
  40  * anyone as to the status of such modified files, you must delete
  41  * this exception notice from them.
  42  *
  43  * If you write modifications of your own for GUILE, it is your choice
  44  * whether to permit this exception to apply to your modifications.
  45  * If you do not wish that, delete this exception notice.  */
  46
  47 \f
  48
  49 #include "libguile/__scm.h"
  50 #include "libguile/print.h"
  51
  52 \f
  53 /* This is the internal representation of a smob type */
  54
  55 typedef struct scm_smob_descriptor
  56 {
  57   char *name;
  58   size_t size;
  59   SCM (*mark) (SCM);
  60   size_t (*free) (SCM);
  61   int (*print) (SCM exp, SCM port, scm_print_state *pstate);
  62   SCM (*equalp) (SCM, SCM);
  63   SCM (*apply) ();
  64   SCM (*apply_0) (SCM);
  65   SCM (*apply_1) (SCM, SCM);
  66   SCM (*apply_2) (SCM, SCM, SCM);
  67   SCM (*apply_3) (SCM, SCM, SCM, SCM);
  68   int gsubr_type; /* Used in procprop.c */
  69 } scm_smob_descriptor;
  70
  71 \f
  72
  73 #define SCM_NEWSMOB(z, tc, data) \
  74 do { \
  75   SCM_NEWCELL (z); \
  76   SCM_SET_CELL_WORD_1 ((z), (data)); \
  77   SCM_SET_CELL_TYPE ((z), (tc)); \
  78 } while (0)
  79
  80 #define SCM_RETURN_NEWSMOB(tc, data) \
  81   do { SCM __SCM_smob_answer; \
  82        SCM_NEWSMOB (__SCM_smob_answer, (tc), (data)); \
  83        return __SCM_smob_answer; \
  84   } while (0)
  85
  86 #define SCM_NEWSMOB2(z, tc, data1, data2) \
  87 do { \
  88   SCM_NEWCELL2 (z); \
  89   SCM_SET_CELL_WORD_1 ((z), (data1)); \
  90   SCM_SET_CELL_WORD_2 ((z), (data2)); \
  91   SCM_SET_CELL_TYPE ((z), (tc)); \
  92 } while (0)
  93
  94 #define SCM_RETURN_NEWSMOB2(tc, data1, data2) \
  95   do { SCM __SCM_smob_answer; \
  96        SCM_NEWSMOB2 (__SCM_smob_answer, (tc), (data1), (data2)); \
  97        return __SCM_smob_answer; \
  98   } while (0)
  99
 100 #define SCM_NEWSMOB3(z, tc, data1, data2, data3) \
 101 do { \
 102   SCM_NEWCELL2 (z); \
 103   SCM_SET_CELL_WORD_1 ((z), (data1)); \
 104   SCM_SET_CELL_WORD_2 ((z), (data2)); \
 105   SCM_SET_CELL_WORD_3 ((z), (data3)); \
 106   SCM_SET_CELL_TYPE ((z), (tc)); \
 107 } while (0)
 108
 109 #define SCM_RETURN_NEWSMOB3(tc, data1, data2, data3) \
 110   do { SCM __SCM_smob_answer; \
 111        SCM_NEWSMOB3 (__SCM_smob_answer, (tc), (data1), (data2), (data3)); \
 112        return __SCM_smob_answer; \
 113   } while (0)
 114
 115
 116 #define SCM_SMOB_DATA(x)                (SCM_CELL_WORD_1 (x))
 117 #define SCM_SET_SMOB_DATA(x, data)      (SCM_SET_CELL_WORD_1 ((x), (data)))
 118 #define SCM_TC2SMOBNUM(x)               (0x0ff & ((x) >> 8))
 119 #define SCM_SMOBNUM(x)                  (SCM_TC2SMOBNUM (SCM_CELL_TYPE (x)))
 120 /* SCM_SMOBNAME can be 0 if name is missing */
 121 #define SCM_SMOBNAME(smobnum)           (scm_smobs[smobnum].name)
 122 #define SCM_SMOB_PREDICATE(tag, obj)    SCM_TYP16_PREDICATE (tag, obj)
 123 #define SCM_SMOB_DESCRIPTOR(x)          (scm_smobs[SCM_SMOBNUM (x)])
 124 #define SCM_SMOB_APPLICABLE_P(x)        (SCM_SMOB_DESCRIPTOR (x).apply)
 125 #define SCM_SMOB_APPLY_0(x)             (SCM_SMOB_DESCRIPTOR (x).apply_0 (x))
 126 #define SCM_SMOB_APPLY_1(x,a1)          (SCM_SMOB_DESCRIPTOR (x).apply_1 (x, (a1)))
 127 #define SCM_SMOB_APPLY_2(x,a1,a2)       (SCM_SMOB_DESCRIPTOR (x).apply_2 (x, (a1), (a2)))
 128 #define SCM_SMOB_APPLY_3(x,a1,a2,rst)   (SCM_SMOB_DESCRIPTOR (x).apply_3 (x, (a1), (a2), (rst)))
 129
 130 extern long scm_numsmob;
 131 extern scm_smob_descriptor scm_smobs[];
 132
 133 \f
 134
 135 extern SCM scm_mark0 (SCM ptr);
 136 extern SCM scm_markcdr (SCM ptr);
 137 extern size_t scm_free0 (SCM ptr);
 138 extern size_t scm_smob_free (SCM obj);
 139 extern int scm_smob_print (SCM exp, SCM port, scm_print_state *pstate);
 140
 141 /* The following set of functions is the standard way to create new
 142  * SMOB types.
 143  *
 144  * Create a type tag using `scm_make_smob_type', accept default values
 145  * for mark, free, print and/or equalp functions, or set your own
 146  * values using `scm_set_smob_xxx'.
 147  */
 148
 149 extern scm_t_bits scm_make_smob_type (char *name, size_t size);
 150
 151 extern void scm_set_smob_mark (scm_t_bits tc, SCM (*mark) (SCM));
 152 extern void scm_set_smob_free (scm_t_bits tc, size_t (*free) (SCM));
 153 extern void scm_set_smob_print (scm_t_bits tc,
 154                                 int (*print) (SCM, SCM, scm_print_state*));
 155 extern void scm_set_smob_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM));
 156 extern void scm_set_smob_apply (scm_t_bits tc,
 157                                 SCM (*apply) (),
 158                                 unsigned int req,
 159                                 unsigned int opt,
 160                                 unsigned int rst);
 161
 162 /* Function for creating smobs */
 163
 164 extern SCM scm_make_smob (scm_t_bits tc);
 165 extern void scm_smob_prehistory (void);
 166
 167 #endif  /* SCM_SMOB_H */
 168
 169 /*
 170   Local Variables:
 171   c-file-style: "gnu"
 172   End:
 173 */