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14d1400fa7
required by the tagging system. * struct.c (alloc_struct): New function. (scm_make_struct, scm_make_vtable_vtable): Call it. * struct.h (scm_struct_n_extra_words): Bump to 3. (scm_struct_i_ptr): New "field". * gc.c (scm_gc_sweep): When we need to free the data, use the information stored by alloc_struct to find the beginning of the block allocated to the structure, so we can free it.
86 lines
3.8 KiB
C
86 lines
3.8 KiB
C
/* classes: h_files */
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#ifndef STRUCTH
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#define STRUCTH
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/* Copyright (C) 1995 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, 675 Mass Ave, Cambridge, MA 02139, 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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*/
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#include "libguile/__scm.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_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_layout 0 /* A symbol describing the physical arrangement of this type. */
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#define scm_struct_i_vcell 1 /* An opaque word, managed by the garbage collector. */
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#define scm_struct_i_vtable 2 /* A pointer to the handle for this vtable. */
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#define scm_struct_i_vtable_offset 3 /* Where do user fields start? */
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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_struct_i_layout])
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#define SCM_STRUCT_VTABLE(X) (SCM_STRUCT_VTABLE_DATA(X)[scm_struct_i_vtable])
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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_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_init_struct SCM_P ((void));
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#endif /* STRUCTH */
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