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ad1965993e
(scm_struct_i_free): New hidden struct slot. Holds destructor for instances to this vtable. (scm_struct_free_0): New destructor: Doesn't deallocate data. (scm_struct_free_light): New destructor: Deallocates a light struct (i.e. a struct without hidden slots). (scm_struct_free_standard): New destructor: Deallocates standard structs. (scm_struct_free_entity): New destructor: Deallocates entity structs. (SCM_SET_VTABLE_DESTRUCTOR): New macro. Changes to hidden slots: (scm_struct_i_size): scm_struct_i_flags now shares space with scm_struct_i_size which holds the size of light structs. (scm_struct_i_n_words): This slot has changed meaning. Previously it included hidden slots. Now it indicates visible slots. (scm_alloc_struct): Clear flags. (SCM_STRUCTF_MASK): 4 new flag positions added => 12 bits. (struct_num, scm_struct_i_tag): Removed. (scm_struct_vtable_tag): Base tag on the pointer to mallocated memory. (scm_struct_ihashq): Base hash value on pointer to struct handle.
119 lines
5.6 KiB
C
119 lines
5.6 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 4
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#define scm_struct_entity_n_extra_words 9
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/* These are how the initial words of a vtable are allocated. */
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#define scm_struct_i_setter -9 /* Setter */
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#define scm_struct_i_proc -8 /* Optional procedure slots */
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#define scm_struct_i_free -4 /* Destructor */
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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_size -1 /* Instance size */
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#define scm_struct_i_flags -1 /* Upper 12 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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typedef size_t (*scm_struct_free_t) (SCM *vtable, SCM *data);
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#define SCM_STRUCTF_MASK (0xFFF << 20)
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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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#define SCM_SET_VTABLE_DESTRUCTOR(X, D) (SCM_STRUCT_DATA(X)[scm_struct_i_free] = (SCM) D)
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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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#define SCM_STRUCT_TABLE_NAME(X) SCM_CAR (X)
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#define SCM_SET_STRUCT_TABLE_NAME(X, NAME) SCM_SETCAR (X, NAME)
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#define SCM_STRUCT_TABLE_CLASS(X) SCM_CDR (X)
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#define SCM_SET_STRUCT_TABLE_CLASS(X, CLASS) SCM_SETCDR (X, CLASS)
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extern SCM scm_struct_table;
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extern SCM *scm_alloc_struct (int n_words,
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int n_extra,
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char *who);
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extern size_t scm_struct_free_0 (SCM *vtable, SCM *data);
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extern size_t scm_struct_free_light (SCM *vtable, SCM *data);
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extern size_t scm_struct_free_standard (SCM *vtable, SCM *data);
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extern size_t scm_struct_free_entity (SCM *vtable, SCM *data);
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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 unsigned int scm_struct_ihashq SCM_P ((SCM obj, unsigned int n));
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extern SCM scm_struct_create_handle SCM_P ((SCM obj));
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extern SCM scm_struct_vtable_name SCM_P ((SCM vtable));
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extern SCM scm_set_struct_vtable_name_x SCM_P ((SCM vtable, SCM name));
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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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