guile/libguile/smob.h

/* classes: h_files */

#ifndef SCM_SMOB_H
#define SCM_SMOB_H

/* Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */



#include "libguile/__scm.h"
#include "libguile/print.h"


/* This is the internal representation of a smob type */

typedef struct scm_smob_descriptor
{
  char *name;
  size_t size;
  SCM (*mark) (SCM);
  size_t (*free) (SCM);
  int (*print) (SCM exp, SCM port, scm_print_state *pstate);
  SCM (*equalp) (SCM, SCM);
  SCM (*apply) ();
  SCM (*apply_0) (SCM);
  SCM (*apply_1) (SCM, SCM);
  SCM (*apply_2) (SCM, SCM, SCM);
  SCM (*apply_3) (SCM, SCM, SCM, SCM);
  int gsubr_type; /* Used in procprop.c */
} scm_smob_descriptor;



#define SCM_NEWSMOB(z, tc, data) \
do { \
  z = scm_cell ((tc), (scm_t_bits) (data)); \
} while (0)

#define SCM_RETURN_NEWSMOB(tc, data) \
  do { SCM __SCM_smob_answer; \
       SCM_NEWSMOB (__SCM_smob_answer, (tc), (data)); \
       return __SCM_smob_answer; \
  } while (0)

#define SCM_NEWSMOB2(z, tc, data1, data2) \
do { \
  z = scm_double_cell ((tc), (scm_t_bits)(data1), (scm_t_bits)(data2), 0); \
} while (0)

#define SCM_RETURN_NEWSMOB2(tc, data1, data2) \
  do { SCM __SCM_smob_answer; \
       SCM_NEWSMOB2 (__SCM_smob_answer, (tc), (data1), (data2)); \
       return __SCM_smob_answer; \
  } while (0)

#define SCM_NEWSMOB3(z, tc, data1, data2, data3) \
do { \
  z = scm_double_cell ((tc), (scm_t_bits)(data1), \
                       (scm_t_bits)(data2), (scm_t_bits)(data3)); \
} while (0)

#define SCM_RETURN_NEWSMOB3(tc, data1, data2, data3) \
  do { SCM __SCM_smob_answer; \
       SCM_NEWSMOB3 (__SCM_smob_answer, (tc), (data1), (data2), (data3)); \
       return __SCM_smob_answer; \
  } while (0)


#define SCM_SMOB_DATA(x)		(SCM_CELL_WORD_1 (x))
#define SCM_SET_SMOB_DATA(x, data)	(SCM_SET_CELL_WORD_1 ((x), (data)))
#define SCM_TC2SMOBNUM(x)		(0x0ff & ((x) >> 8))
#define SCM_SMOBNUM(x)			(SCM_TC2SMOBNUM (SCM_CELL_TYPE (x)))
/* SCM_SMOBNAME can be 0 if name is missing */
#define SCM_SMOBNAME(smobnum)		(scm_smobs[smobnum].name)
#define SCM_SMOB_PREDICATE(tag, obj)	SCM_TYP16_PREDICATE (tag, obj)
#define SCM_SMOB_DESCRIPTOR(x)		(scm_smobs[SCM_SMOBNUM (x)])
#define SCM_SMOB_APPLICABLE_P(x)	(SCM_SMOB_DESCRIPTOR (x).apply)
#define SCM_SMOB_APPLY_0(x)		(SCM_SMOB_DESCRIPTOR (x).apply_0 (x))
#define SCM_SMOB_APPLY_1(x, a1)		(SCM_SMOB_DESCRIPTOR (x).apply_1 (x, (a1)))
#define SCM_SMOB_APPLY_2(x, a1, a2)	(SCM_SMOB_DESCRIPTOR (x).apply_2 (x, (a1), (a2)))
#define SCM_SMOB_APPLY_3(x, a1, a2, rst)	(SCM_SMOB_DESCRIPTOR (x).apply_3 (x, (a1), (a2), (rst)))

SCM_API long scm_numsmob;
SCM_API scm_smob_descriptor scm_smobs[];



SCM_API SCM scm_mark0 (SCM ptr);
SCM_API SCM scm_markcdr (SCM ptr);
SCM_API size_t scm_free0 (SCM ptr);
SCM_API size_t scm_smob_free (SCM obj);
SCM_API int scm_smob_print (SCM exp, SCM port, scm_print_state *pstate);

/* The following set of functions is the standard way to create new
 * SMOB types.
 *
 * Create a type tag using `scm_make_smob_type', accept default values
 * for mark, free, print and/or equalp functions, or set your own
 * values using `scm_set_smob_xxx'.
 */

SCM_API scm_t_bits scm_make_smob_type (char *name, size_t size);

SCM_API void scm_set_smob_mark (scm_t_bits tc, SCM (*mark) (SCM));
SCM_API void scm_set_smob_free (scm_t_bits tc, size_t (*free) (SCM));
SCM_API void scm_set_smob_print (scm_t_bits tc,
				 int (*print) (SCM, SCM, scm_print_state*));
SCM_API void scm_set_smob_equalp (scm_t_bits tc, SCM (*equalp) (SCM, SCM));
SCM_API void scm_set_smob_apply (scm_t_bits tc,
				 SCM (*apply) (),
				 unsigned int req,
				 unsigned int opt,
				 unsigned int rst);

/* Function for creating smobs */

SCM_API SCM scm_make_smob (scm_t_bits tc);
SCM_API void scm_smob_prehistory (void);

#endif  /* SCM_SMOB_H */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/