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maintainer changed: was lord, now jimb; first import

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Jim Blandy 1996-07-25 22:56:11 +00:00
commit 0f2d19dd46
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101
libguile/struct.h Normal file
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/* classes: h_files */
#ifndef STRUCTH
#define STRUCTH
/* Copyright (C) 1995 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, 675 Mass Ave, Cambridge, MA 02139, 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 "__scm.h"
/* These are how the initial words of a vtable are allocated. */
#define scm_struct_i_n_words -2 /* How many words allocated to this struct? */
#define scm_struct_i_tag -1 /* A unique tag for this type.. */
#define scm_struct_i_layout 0 /* A symbol describing the physical arrangement of this type. */
#define scm_struct_i_vcell 1 /* An opaque word, managed by the garbage collector. */
#define scm_struct_i_vtable 2 /* A pointer to the handle for this vtable. */
#define scm_struct_i_vtable_offset 3 /* Where do user fields start? */
#define SCM_STRUCTP(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_CAR(X) - 1))
#define SCM_STRUCT_LAYOUT(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_struct_i_layout])
#define SCM_STRUCT_VTABLE(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_struct_i_vtable])
#ifdef __STDC__
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 void scm_init_struct (void);
#else /* STDC */
extern SCM scm_make_struct_layout ();
extern SCM scm_struct_p ();
extern SCM scm_struct_vtable_p ();
extern SCM scm_make_struct ();
extern SCM scm_make_vtable_vtable ();
extern SCM scm_struct_ref ();
extern SCM scm_struct_set_x ();
extern SCM scm_struct_vtable ();
extern SCM scm_struct_vtable_tag ();
extern void scm_init_struct ();
#endif /* STDC */
#endif /* STRUCTH */