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97 lines
4.5 KiB
C
97 lines
4.5 KiB
C
/* classes: h_files */
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#ifndef STRUCTH
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#define STRUCTH
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/* Copyright (C) 1995, 1997 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/__scm.h"
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#include "libguile/print.h"
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/* Number of words with negative index */
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#define scm_struct_n_extra_words 3
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/* These are how the initial words of a vtable are allocated. */
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#define scm_struct_i_proc -7 /* Optional procedure slots */
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#define scm_struct_i_ptr -3 /* start of block (see alloc_struct) */
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#define scm_struct_i_n_words -2 /* How many words allocated to this struct? */
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#define scm_struct_i_tag -1 /* A unique tag for this type.. */
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#define scm_struct_i_flags -1 /* Upper 8 bits used as flags */
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#define scm_vtable_index_layout 0 /* A symbol describing the physical arrangement of this type. */
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#define scm_vtable_index_vcell 1 /* An opaque word, managed by the garbage collector. */
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#define scm_vtable_index_vtable 2 /* A pointer to the handle for this vtable. */
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#define scm_vtable_index_printer 3 /* A printer for this struct type. */
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#define scm_vtable_offset_user 4 /* Where do user fields start? */
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#define SCM_STRUCTF_ENTITY (1L << 30) /* Indicates presence of proc slots */
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#define SCM_STRUCTF_LIGHT (1L << 31) /* Light representation
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(no hidden words) */
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#define SCM_STRUCTP(X) (SCM_TYP3(X) == scm_tc3_cons_gloc)
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#define SCM_STRUCT_DATA(X) ((SCM*)(SCM_CDR(X)))
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#define SCM_STRUCT_VTABLE_DATA(X) ((SCM *)(SCM_CAR(X) - 1))
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#define SCM_STRUCT_LAYOUT(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_vtable_index_layout])
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#define SCM_STRUCT_VTABLE(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_vtable_index_vtable])
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#define SCM_STRUCT_PRINTER(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_vtable_index_printer])
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/* Efficiency is important in the following macro, since it's used in GC */
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#define SCM_LAYOUT_TAILP(X) (((X) & 32) == 0) /* R, W or O */
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extern SCM *scm_alloc_struct SCM_P ((int n_words, int n_extra, char *who));
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extern void scm_struct_init SCM_P ((SCM handle, int tail_elts, SCM inits));
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extern SCM scm_make_struct_layout SCM_P ((SCM fields));
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extern SCM scm_struct_p SCM_P ((SCM x));
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extern SCM scm_struct_vtable_p SCM_P ((SCM x));
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extern SCM scm_make_struct SCM_P ((SCM vtable, SCM tail_array_size, SCM init));
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extern SCM scm_make_vtable_vtable SCM_P ((SCM extra_fields, SCM tail_array_size, SCM init));
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extern SCM scm_struct_ref SCM_P ((SCM handle, SCM pos));
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extern SCM scm_struct_set_x SCM_P ((SCM handle, SCM pos, SCM val));
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extern SCM scm_struct_vtable SCM_P ((SCM handle));
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extern SCM scm_struct_vtable_tag SCM_P ((SCM handle));
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extern void scm_print_struct SCM_P ((SCM exp, SCM port, scm_print_state *));
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extern void scm_init_struct SCM_P ((void));
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#endif /* STRUCTH */
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