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- /* classes: h_files */
-
- #ifndef STRUCTH
- #define STRUCTH
- /* Copyright (C) 1995, 1997 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"
-
-
-
- /* Number of words with negative index */
- #define scm_struct_n_extra_words 3
-
- /* These are how the initial words of a vtable are allocated. */
- #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_tag -1 /* A unique tag for this type.. */
- #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? */
-
-
- #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_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])
- /* 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 */
-
-
-
-
- extern SCM scm_make_struct_layout SCM_P ((SCM fields));
- extern SCM scm_struct_p SCM_P ((SCM x));
- extern SCM scm_struct_vtable_p SCM_P ((SCM x));
- extern SCM scm_make_struct SCM_P ((SCM vtable, SCM tail_array_size, SCM init));
- extern SCM scm_make_vtable_vtable SCM_P ((SCM extra_fields, SCM tail_array_size, SCM init));
- extern SCM scm_struct_ref SCM_P ((SCM handle, SCM pos));
- extern SCM scm_struct_set_x SCM_P ((SCM handle, SCM pos, SCM val));
- extern SCM scm_struct_vtable SCM_P ((SCM handle));
- extern SCM scm_struct_vtable_tag SCM_P ((SCM handle));
- extern void scm_print_struct SCM_P ((SCM exp, SCM port, scm_print_state *));
- extern void scm_init_struct SCM_P ((void));
-
- #endif /* STRUCTH */
-