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   z = scm_cell ((tc), (scm_t_bits) (data)); \
  76 } while (0)
  77
  78 #define SCM_RETURN_NEWSMOB(tc, data) \
  79   do { SCM __SCM_smob_answer; \
  80        SCM_NEWSMOB (__SCM_smob_answer, (tc), (data)); \
  81        return __SCM_smob_answer; \
  82   } while (0)
  83
  84 #define SCM_NEWSMOB2(z, tc, data1, data2) \
  85 do { \
  86   z = scm_double_cell ((tc), (scm_t_bits)(data1), (scm_t_bits)(data2), 0); \
  87 } while (0)
  88
  89 #define SCM_RETURN_NEWSMOB2(tc, data1, data2) \
  90   do { SCM __SCM_smob_answer; \
  91        SCM_NEWSMOB2 (__SCM_smob_answer, (tc), (data1), (data2)); \
  92        return __SCM_smob_answer; \
  93   } while (0)
  94
  95 #define SCM_NEWSMOB3(z, tc, data1, data2, data3) \
  96 do { \
  97   z = scm_double_cell ((tc), (scm_t_bits)(data1), \
  98                        (scm_t_bits)(data2), (scm_t_bits)(data3)); \
  99 } while (0)
 100
 101 #define SCM_RETURN_NEWSMOB3(tc, data1, data2, data3) \
 102   do { SCM __SCM_smob_answer; \
 103        SCM_NEWSMOB3 (__SCM_smob_answer, (tc), (data1), (data2), (data3)); \
 104        return __SCM_smob_answer; \
 105   } while (0)
 106
 107
 108 #define SCM_SMOB_DATA(x)                (SCM_CELL_WORD_1 (x))
 109 #define SCM_SET_SMOB_DATA(x, data)      (SCM_SET_CELL_WORD_1 ((x), (data)))
 110 #define SCM_TC2SMOBNUM(x)               (0x0ff & ((x) >> 8))
 111 #define SCM_SMOBNUM(x)                  (SCM_TC2SMOBNUM (SCM_CELL_TYPE (x)))
 112 /* SCM_SMOBNAME can be 0 if name is missing */
 113 #define SCM_SMOBNAME(smobnum)           (scm_smobs[smobnum].name)
 114 #define SCM_SMOB_PREDICATE(tag, obj)    SCM_TYP16_PREDICATE (tag, obj)
 115 #define SCM_SMOB_DESCRIPTOR(x)          (scm_smobs[SCM_SMOBNUM (x)])
 116 #define SCM_SMOB_APPLICABLE_P(x)        (SCM_SMOB_DESCRIPTOR (x).apply)
 117 #define SCM_SMOB_APPLY_0(x)             (SCM_SMOB_DESCRIPTOR (x).apply_0 (x))
 118 #define SCM_SMOB_APPLY_1(x,a1)          (SCM_SMOB_DESCRIPTOR (x).apply_1 (x, (a1)))
 119 #define SCM_SMOB_APPLY_2(x,a1,a2)       (SCM_SMOB_DESCRIPTOR (x).apply_2 (x, (a1), (a2)))
 120 #define SCM_SMOB_APPLY_3(x,a1,a2,rst)   (SCM_SMOB_DESCRIPTOR (x).apply_3 (x, (a1), (a2), (rst)))
 121
 122 SCM_API long scm_numsmob;
 123 SCM_API scm_smob_descriptor scm_smobs[];
 124
 125 \f
 126
 127 SCM_API SCM scm_mark0 (SCM ptr);
 128 SCM_API SCM scm_markcdr (SCM ptr);
 129 SCM_API size_t scm_free0 (SCM ptr);
 130 SCM_API size_t scm_smob_free (SCM obj);
 131 SCM_API int scm_smob_print (SCM exp, SCM port, scm_print_state *pstate);
 132
 133 /* The following set of functions is the standard way to create new
 134  * SMOB types.
 135  *
 136  * Create a type tag using `scm_make_smob_type', accept default values
 137  * for mark, free, print and/or equalp functions, or set your own
 138  * values using `scm_set_smob_xxx'.
 139  */
 140
 141 SCM_API scm_t_bits scm_make_smob_type (char *name, size_t size);
 142
 143 SCM_API void scm_set_smob_mark (scm_t_bits tc, SCM (*mark) (SCM));
 144 SCM_API void scm_set_smob_free (scm_t_bits tc, size_t (*free) (SCM));
 145 SCM_API void scm_set_smob_print (scm_t_bits tc,
 146                                  int (*print) (SCM, SCM, scm_print_state*));
 147 SCM_API void scm_set_smob_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM));
 148 SCM_API void scm_set_smob_apply (scm_t_bits tc,
 149                                  SCM (*apply) (),
 150                                  unsigned int req,
 151                                  unsigned int opt,
 152                                  unsigned int rst);
 153
 154 /* Function for creating smobs */
 155
 156 SCM_API SCM scm_make_smob (scm_t_bits tc);
 157 SCM_API void scm_smob_prehistory (void);
 158
 159 #endif  /* SCM_SMOB_H */
 160
 161 /*
 162   Local Variables:
 163   c-file-style: "gnu"
 164   End:
 165 */