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/* classes: h_files */
#ifndef STRUCTH
#define STRUCTH
/* Copyright (C) 1995, 1997, 1999, 2000 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. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
#include "libguile/__scm.h"
#include "libguile/print.h"
/* Number of words with negative index */
#define scm_struct_n_extra_words 4
#define scm_struct_entity_n_extra_words 6
/* These are how the initial words of a vtable are allocated. */
#define scm_struct_i_setter -6 /* Setter */
#define scm_struct_i_procedure -5 /* Optional procedure slot */
#define scm_struct_i_free -4 /* Destructor */
#define scm_struct_i_ptr -3 /* Start of block (see alloc_struct) */
#define scm_struct_i_n_words -2 /* How many words allocated to this struct? */
#define scm_struct_i_size -1 /* Instance size */
#define scm_struct_i_flags -1 /* Upper 12 bits used as flags */
#define scm_vtable_index_layout 0 /* A symbol describing the physical arrangement of this type. */
#define scm_vtable_index_vcell 1 /* An opaque word, managed by the garbage collector. */
#define scm_vtable_index_vtable 2 /* A pointer to the handle for this vtable. */
#define scm_vtable_index_printer 3 /* A printer for this struct type. */
#define scm_vtable_offset_user 4 /* Where do user fields start? */
typedef scm_sizet (*scm_struct_free_t) (SCM *vtable, SCM *data);
#define SCM_STRUCTF_MASK (0xFFF << 20)
#define SCM_STRUCTF_ENTITY (1L << 30) /* Indicates presence of proc slots */
#define SCM_STRUCTF_LIGHT (1L << 31) /* Light representation
(no hidden words) */
#define SCM_STRUCTP(X) (SCM_NIMP(X) && (SCM_TYP3(X) == scm_tc3_cons_gloc))
#define SCM_STRUCT_DATA(X) ((SCM*)(SCM_CDR(X)))
#define SCM_STRUCT_VTABLE_DATA(X) ((SCM *)(SCM_UNPACK (SCM_CAR(X)) - 1))
#define SCM_STRUCT_LAYOUT(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_vtable_index_layout])
#define SCM_STRUCT_VTABLE(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_vtable_index_vtable])
#define SCM_STRUCT_PRINTER(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_vtable_index_printer])
#define SCM_SET_VTABLE_DESTRUCTOR(X, D) (SCM_STRUCT_DATA(X)[scm_struct_i_free] = (SCM) D)
/* Efficiency is important in the following macro, since it's used in GC */
#define SCM_LAYOUT_TAILP(X) (((X) & 32) == 0) /* R, W or O */
#define SCM_STRUCT_TABLE_NAME(X) SCM_CAR (X)
#define SCM_SET_STRUCT_TABLE_NAME(X, NAME) SCM_SETCAR (X, NAME)
#define SCM_STRUCT_TABLE_CLASS(X) SCM_CDR (X)
#define SCM_SET_STRUCT_TABLE_CLASS(X, CLASS) SCM_SETCDR (X, CLASS)
extern SCM scm_struct_table;
extern SCM *scm_alloc_struct (int n_words,
int n_extra,
char *who);
extern scm_sizet scm_struct_free_0 (SCM *vtable, SCM *data);
extern scm_sizet scm_struct_free_light (SCM *vtable, SCM *data);
extern scm_sizet scm_struct_free_standard (SCM *vtable, SCM *data);
extern scm_sizet scm_struct_free_entity (SCM *vtable, SCM *data);
extern void scm_struct_init (SCM handle, int tail_elts, SCM inits);
extern SCM scm_make_struct_layout (SCM fields);
extern SCM scm_struct_p (SCM x);
extern SCM scm_struct_vtable_p (SCM x);
extern SCM scm_make_struct (SCM vtable, SCM tail_array_size, SCM init);
extern SCM scm_make_vtable_vtable (SCM extra_fields, SCM tail_array_size, SCM init);
extern SCM scm_struct_ref (SCM handle, SCM pos);
extern SCM scm_struct_set_x (SCM handle, SCM pos, SCM val);
extern SCM scm_struct_vtable (SCM handle);
extern SCM scm_struct_vtable_tag (SCM handle);
extern unsigned int scm_struct_ihashq (SCM obj, unsigned int n);
extern SCM scm_struct_create_handle (SCM obj);
extern SCM scm_struct_vtable_name (SCM vtable);
extern SCM scm_set_struct_vtable_name_x (SCM vtable, SCM name);
extern void scm_print_struct (SCM exp, SCM port, scm_print_state *);
extern void scm_init_struct (void);
#endif /* STRUCTH */
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