mirror of
https://git.savannah.gnu.org/git/guile.git
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34d19ef643
* *.c: add space after commas everywhere. * *.c: use SCM_VECTOR_SET everywhere, where a vector is written. Document cases where SCM_WRITABLE_VELTS() is used. * vectors.h (SCM_VELTS): prepare for write barrier, and let SCM_VELTS() return a const pointer (SCM_VECTOR_SET): add macro. * autogen.sh (mscripts): find and check version number of autoconf. Complain if 2.53 is not found.
528 lines
15 KiB
C
528 lines
15 KiB
C
/* Copyright (C) 1995,1996,1999,2000,2001 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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/* This file and objects.h contains those minimal pieces of the Guile
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* Object Oriented Programming System which need to be included in
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* libguile. See the comments in objects.h.
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*/
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#include "libguile/_scm.h"
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#include "libguile/struct.h"
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#include "libguile/procprop.h"
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#include "libguile/chars.h"
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#include "libguile/keywords.h"
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#include "libguile/smob.h"
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#include "libguile/eval.h"
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#include "libguile/alist.h"
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#include "libguile/ports.h"
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#include "libguile/strings.h"
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#include "libguile/vectors.h"
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#include "libguile/validate.h"
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#include "libguile/objects.h"
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SCM scm_metaclass_standard;
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SCM scm_metaclass_operator;
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/* These variables are filled in by the object system when loaded. */
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SCM scm_class_boolean, scm_class_char, scm_class_pair;
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SCM scm_class_procedure, scm_class_string, scm_class_symbol;
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SCM scm_class_procedure_with_setter, scm_class_primitive_generic;
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SCM scm_class_vector, scm_class_null;
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SCM scm_class_integer, scm_class_real, scm_class_complex;
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SCM scm_class_unknown;
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SCM *scm_port_class = 0;
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SCM *scm_smob_class = 0;
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SCM scm_no_applicable_method;
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/* This function is used for efficient type dispatch. */
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SCM_DEFINE (scm_class_of, "class-of", 1, 0, 0,
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(SCM x),
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"Return the class of @var{x}.")
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#define FUNC_NAME s_scm_class_of
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{
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switch (SCM_ITAG3 (x))
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{
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case scm_tc3_int_1:
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case scm_tc3_int_2:
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return scm_class_integer;
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case scm_tc3_imm24:
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if (SCM_CHARP (x))
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return scm_class_char;
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else
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{
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switch (SCM_ISYMNUM (x))
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{
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case SCM_ISYMNUM (SCM_BOOL_F):
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case SCM_ISYMNUM (SCM_BOOL_T):
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return scm_class_boolean;
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case SCM_ISYMNUM (SCM_EOL):
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return scm_class_null;
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default:
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return scm_class_unknown;
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}
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}
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case scm_tc3_cons:
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switch (SCM_TYP7 (x))
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{
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case scm_tcs_cons_nimcar:
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return scm_class_pair;
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case scm_tcs_closures:
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return scm_class_procedure;
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case scm_tc7_symbol:
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return scm_class_symbol;
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case scm_tc7_vector:
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case scm_tc7_wvect:
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#ifdef HAVE_ARRAYS
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case scm_tc7_bvect:
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case scm_tc7_byvect:
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case scm_tc7_svect:
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case scm_tc7_ivect:
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case scm_tc7_uvect:
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case scm_tc7_fvect:
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case scm_tc7_dvect:
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case scm_tc7_cvect:
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#endif
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return scm_class_vector;
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case scm_tc7_string:
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return scm_class_string;
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case scm_tc7_asubr:
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case scm_tc7_subr_0:
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case scm_tc7_subr_1:
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case scm_tc7_cxr:
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case scm_tc7_subr_3:
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case scm_tc7_subr_2:
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case scm_tc7_rpsubr:
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case scm_tc7_subr_1o:
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case scm_tc7_subr_2o:
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case scm_tc7_lsubr_2:
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case scm_tc7_lsubr:
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if (SCM_SUBR_GENERIC (x) && *SCM_SUBR_GENERIC (x))
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return scm_class_primitive_generic;
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else
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return scm_class_procedure;
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case scm_tc7_cclo:
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return scm_class_procedure;
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case scm_tc7_pws:
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return scm_class_procedure_with_setter;
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case scm_tc7_smob:
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{
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scm_t_bits type = SCM_TYP16 (x);
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if (type != scm_tc16_port_with_ps)
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return scm_smob_class[SCM_TC2SMOBNUM (type)];
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x = SCM_PORT_WITH_PS_PORT (x);
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/* fall through to ports */
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}
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case scm_tc7_port:
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return scm_port_class[(SCM_WRTNG & SCM_CELL_WORD_0 (x)
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? (SCM_RDNG & SCM_CELL_WORD_0 (x)
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? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x)
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: SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x))
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: SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))];
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case scm_tcs_struct:
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if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID)
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return SCM_CLASS_OF (x);
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else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
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{
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/* Goops object */
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if (! SCM_FALSEP (SCM_OBJ_CLASS_REDEF (x)))
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scm_change_object_class (x,
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SCM_CLASS_OF (x), /* old */
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SCM_OBJ_CLASS_REDEF (x)); /* new */
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return SCM_CLASS_OF (x);
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}
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else
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{
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/* ordinary struct */
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SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x));
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if (!SCM_FALSEP (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle))))
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return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle));
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else
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{
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SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle));
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SCM class = scm_make_extended_class (!SCM_FALSEP (name)
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? SCM_SYMBOL_CHARS (name)
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: 0);
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SCM_SET_STRUCT_TABLE_CLASS (SCM_CDR (handle), class);
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return class;
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}
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}
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default:
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if (SCM_CONSP (x))
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return scm_class_pair;
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else
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return scm_class_unknown;
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}
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case scm_tc3_struct:
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case scm_tc3_tc7_1:
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case scm_tc3_tc7_2:
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case scm_tc3_closure:
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/* Never reached */
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break;
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}
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return scm_class_unknown;
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}
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#undef FUNC_NAME
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/* The cache argument for scm_mcache_lookup_cmethod has one of two possible
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* formats:
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*
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* Format #1:
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* (SCM_IM_DISPATCH ARGS N-SPECIALIZED
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* #((TYPE1 ... ENV FORMALS FORM ...) ...)
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* GF)
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*
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* Format #2:
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* (SCM_IM_HASH_DISPATCH ARGS N-SPECIALIZED HASHSET MASK
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* #((TYPE1 ... ENV FORMALS FORM ...) ...)
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* GF)
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*
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* ARGS is either a list of expressions, in which case they
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* are interpreted as the arguments of an application, or
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* a non-pair, which is interpreted as a single expression
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* yielding all arguments.
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*
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* SCM_IM_DISPATCH expressions in generic functions always
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* have ARGS = the symbol `args' or the iloc #@0-0.
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*
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* Need FORMALS in order to support varying arity. This
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* also avoids the need for renaming of bindings.
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*
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* We should probably not complicate this mechanism by
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* introducing "optimizations" for getters and setters or
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* primitive methods. Getters and setter will normally be
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* compiled into @slot-[ref|set!] or a procedure call.
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* They rely on the dispatch performed before executing
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* the code which contains them.
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*
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* We might want to use a more efficient representation of
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* this form in the future, perhaps after we have introduced
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* low-level support for syntax-case macros.
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*/
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SCM
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scm_mcache_lookup_cmethod (SCM cache, SCM args)
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{
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long i, n, end, mask;
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SCM ls, methods, z = SCM_CDDR (cache);
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n = SCM_INUM (SCM_CAR (z)); /* maximum number of specializers */
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methods = SCM_CADR (z);
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if (SCM_INUMP (methods))
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{
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/* cache format #2: compute a hash value */
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long hashset = SCM_INUM (methods);
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long j = n;
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z = SCM_CDDR (z);
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mask = SCM_INUM (SCM_CAR (z));
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methods = SCM_CADR (z);
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i = 0;
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ls = args;
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if (!SCM_NULLP (ls))
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do
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{
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i += SCM_STRUCT_DATA (scm_class_of (SCM_CAR (ls)))
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[scm_si_hashsets + hashset];
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ls = SCM_CDR (ls);
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}
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while (j-- && !SCM_NULLP (ls));
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i &= mask;
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end = i;
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}
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else /* SCM_VECTORP (methods) */
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{
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/* cache format #1: prepare for linear search */
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mask = -1;
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i = 0;
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end = SCM_VECTOR_LENGTH (methods);
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}
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/* Search for match */
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do
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{
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long j = n;
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z = SCM_VELTS (methods)[i];
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ls = args; /* list of arguments */
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if (!SCM_NULLP (ls))
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do
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{
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/* More arguments than specifiers => CLASS != ENV */
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if (! SCM_EQ_P (scm_class_of (SCM_CAR (ls)), SCM_CAR (z)))
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goto next_method;
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ls = SCM_CDR (ls);
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z = SCM_CDR (z);
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}
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while (j-- && !SCM_NULLP (ls));
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/* Fewer arguments than specifiers => CAR != ENV */
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if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z)))
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return z;
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next_method:
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i = (i + 1) & mask;
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} while (i != end);
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return SCM_BOOL_F;
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}
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SCM
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scm_mcache_compute_cmethod (SCM cache, SCM args)
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{
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SCM cmethod = scm_mcache_lookup_cmethod (cache, args);
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if (SCM_FALSEP (cmethod))
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/* No match - memoize */
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return scm_memoize_method (cache, args);
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return cmethod;
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}
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SCM
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scm_apply_generic (SCM gf, SCM args)
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{
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SCM cmethod = scm_mcache_compute_cmethod (SCM_ENTITY_PROCEDURE (gf), args);
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return scm_eval_body (SCM_CDR (SCM_CMETHOD_CODE (cmethod)),
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SCM_EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (cmethod)),
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args,
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SCM_CMETHOD_ENV (cmethod)));
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}
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SCM
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scm_call_generic_0 (SCM gf)
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{
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return scm_apply_generic (gf, SCM_EOL);
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}
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SCM
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scm_call_generic_1 (SCM gf, SCM a1)
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{
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return scm_apply_generic (gf, scm_list_1 (a1));
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}
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SCM
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scm_call_generic_2 (SCM gf, SCM a1, SCM a2)
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{
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return scm_apply_generic (gf, scm_list_2 (a1, a2));
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}
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SCM
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scm_call_generic_3 (SCM gf, SCM a1, SCM a2, SCM a3)
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{
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return scm_apply_generic (gf, scm_list_3 (a1, a2, a3));
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}
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SCM_DEFINE (scm_entity_p, "entity?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if @var{obj} is an entity.")
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#define FUNC_NAME s_scm_entity_p
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{
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return SCM_BOOL(SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_operator_p, "operator?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if @var{obj} is an operator.")
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#define FUNC_NAME s_scm_operator_p
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{
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return SCM_BOOL(SCM_STRUCTP (obj)
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&& SCM_I_OPERATORP (obj)
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&& !SCM_I_ENTITYP (obj));
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}
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#undef FUNC_NAME
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/* XXX - What code requires the object procedure to be only of certain
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types? */
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SCM_DEFINE (scm_valid_object_procedure_p, "valid-object-procedure?", 1, 0, 0,
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(SCM proc),
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"Return @code{#t} iff @var{proc} is a procedure that can be used "
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"with @code{set-object-procedure}. It is always valid to use "
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"a closure constructed by @code{lambda}.")
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#define FUNC_NAME s_scm_valid_object_procedure_p
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{
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if (SCM_IMP (proc))
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return SCM_BOOL_F;
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switch (SCM_TYP7 (proc))
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{
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default:
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return SCM_BOOL_F;
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case scm_tcs_closures:
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case scm_tc7_subr_1:
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case scm_tc7_subr_2:
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case scm_tc7_subr_3:
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case scm_tc7_lsubr_2:
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return SCM_BOOL_T;
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}
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_set_object_procedure_x, "set-object-procedure!", 2, 0, 0,
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(SCM obj, SCM proc),
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"Set the object procedure of @var{obj} to @var{proc}.\n"
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"@var{obj} must be either an entity or an operator.")
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#define FUNC_NAME s_scm_set_object_procedure_x
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{
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SCM_ASSERT (SCM_STRUCTP (obj)
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&& ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
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|| (SCM_I_ENTITYP (obj)
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&& !(SCM_OBJ_CLASS_FLAGS (obj)
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& SCM_CLASSF_PURE_GENERIC))),
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obj,
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SCM_ARG1,
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FUNC_NAME);
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SCM_ASSERT (scm_valid_object_procedure_p (proc), proc, SCM_ARG2, FUNC_NAME);
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if (SCM_I_ENTITYP (obj))
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SCM_SET_ENTITY_PROCEDURE (obj, proc);
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else
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SCM_OPERATOR_CLASS (obj)->procedure = proc;
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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#ifdef GUILE_DEBUG
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SCM_DEFINE (scm_object_procedure, "object-procedure", 1, 0, 0,
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(SCM obj),
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"Return the object procedure of @var{obj}. @var{obj} must be\n"
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"an entity or an operator.")
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#define FUNC_NAME s_scm_object_procedure
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{
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SCM_ASSERT (SCM_STRUCTP (obj)
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&& ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
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|| SCM_I_ENTITYP (obj)),
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obj, SCM_ARG1, FUNC_NAME);
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return (SCM_I_ENTITYP (obj)
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? SCM_ENTITY_PROCEDURE (obj)
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: SCM_OPERATOR_CLASS (obj)->procedure);
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}
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#undef FUNC_NAME
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#endif /* GUILE_DEBUG */
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/* The following procedures are not a part of Goops but a minimal
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* object system built upon structs. They are here for those who
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* want to implement their own object system.
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*/
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SCM
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scm_i_make_class_object (SCM meta,
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SCM layout_string,
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unsigned long flags)
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{
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SCM c;
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SCM layout = scm_make_struct_layout (layout_string);
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c = scm_make_struct (meta,
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SCM_INUM0,
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scm_list_4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
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SCM_SET_CLASS_FLAGS (c, flags);
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return c;
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}
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SCM_DEFINE (scm_make_class_object, "make-class-object", 2, 0, 0,
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(SCM metaclass, SCM layout),
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"Create a new class object of class @var{metaclass}, with the\n"
|
||
"slot layout specified by @var{layout}.")
|
||
#define FUNC_NAME s_scm_make_class_object
|
||
{
|
||
unsigned long flags = 0;
|
||
SCM_VALIDATE_STRUCT (1, metaclass);
|
||
SCM_VALIDATE_STRING (2, layout);
|
||
if (SCM_EQ_P (metaclass, scm_metaclass_operator))
|
||
flags = SCM_CLASSF_OPERATOR;
|
||
return scm_i_make_class_object (metaclass, layout, flags);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_make_subclass_object, "make-subclass-object", 2, 0, 0,
|
||
(SCM class, SCM layout),
|
||
"Create a subclass object of @var{class}, with the slot layout\n"
|
||
"specified by @var{layout}.")
|
||
#define FUNC_NAME s_scm_make_subclass_object
|
||
{
|
||
SCM pl;
|
||
SCM_VALIDATE_STRUCT (1, class);
|
||
SCM_VALIDATE_STRING (2, layout);
|
||
pl = SCM_PACK (SCM_STRUCT_DATA (class) [scm_vtable_index_layout]);
|
||
/* Convert symbol->string */
|
||
pl = scm_mem2string (SCM_SYMBOL_CHARS (pl), SCM_SYMBOL_LENGTH (pl));
|
||
return scm_i_make_class_object (SCM_STRUCT_VTABLE (class),
|
||
scm_string_append (scm_list_2 (pl, layout)),
|
||
SCM_CLASS_FLAGS (class));
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
void
|
||
scm_init_objects ()
|
||
{
|
||
SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT);
|
||
SCM mt = scm_make_vtable_vtable (ms, SCM_INUM0,
|
||
scm_list_3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
|
||
|
||
SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT);
|
||
SCM ot = scm_make_vtable_vtable (os, SCM_INUM0,
|
||
scm_list_3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
|
||
|
||
SCM es = scm_makfrom0str (SCM_ENTITY_LAYOUT);
|
||
SCM el = scm_make_struct_layout (es);
|
||
SCM et = scm_make_struct (mt, SCM_INUM0,
|
||
scm_list_4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
|
||
|
||
scm_c_define ("<class>", mt);
|
||
scm_metaclass_standard = mt;
|
||
scm_c_define ("<operator-class>", ot);
|
||
scm_metaclass_operator = ot;
|
||
SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
|
||
SCM_SET_CLASS_DESTRUCTOR (et, scm_struct_free_entity);
|
||
scm_c_define ("<entity>", et);
|
||
|
||
#include "libguile/objects.x"
|
||
}
|
||
|
||
/*
|
||
Local Variables:
|
||
c-file-style: "gnu"
|
||
End:
|
||
*/
|