X-Git-Url: https://git.hcoop.net/bpt/guile.git/blobdiff_plain/d8c40b9f49836a0d8c28b49ff5346033c50e113d..fbb857a472eb4e69c1cba05e86646b7004f32df6:/libguile/objects.c diff --git a/libguile/objects.c b/libguile/objects.c dissimilarity index 60% index 03330eb4f..f686c3a00 100644 --- a/libguile/objects.c +++ b/libguile/objects.c @@ -1,500 +1,371 @@ -/* Copyright (C) 1995, 1996, 1999, 2000 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. */ - -/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, - gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ - - - -/* This file and objects.h contains those minimal pieces of the Guile - * Object Oriented Programming System which need to be included in - * libguile. See the comments in objects.h. - */ - -#include "_scm.h" - -#include "struct.h" -#include "procprop.h" -#include "chars.h" -#include "keywords.h" -#include "smob.h" -#include "eval.h" -#include "alist.h" -#include "ports.h" -#include "strings.h" -#include "vectors.h" - -#include "validate.h" -#include "objects.h" - - -SCM scm_metaclass_standard; -SCM scm_metaclass_operator; - -/* These variables are filled in by the object system when loaded. */ -SCM scm_class_boolean, scm_class_char, scm_class_pair; -SCM scm_class_procedure, scm_class_string, scm_class_symbol; -SCM scm_class_procedure_with_setter, scm_class_primitive_generic; -SCM scm_class_vector, scm_class_null; -SCM scm_class_integer, scm_class_real, scm_class_complex; -SCM scm_class_unknown; - -SCM *scm_port_class = 0; -SCM *scm_smob_class = 0; - -SCM scm_no_applicable_method; - -SCM (*scm_make_extended_class) (char *type_name); -void (*scm_make_port_classes) (int ptobnum, char *type_name); -void (*scm_change_object_class) (SCM, SCM, SCM); - -/* This function is used for efficient type dispatch. */ -SCM -scm_class_of (SCM x) -{ - switch (SCM_ITAG3 (x)) - { - case scm_tc3_int_1: - case scm_tc3_int_2: - return scm_class_integer; - - case scm_tc3_imm24: - if (SCM_CHARP (x)) - return scm_class_char; - else - { - switch (SCM_ISYMNUM (x)) - { - case SCM_ISYMNUM (SCM_BOOL_F): - case SCM_ISYMNUM (SCM_BOOL_T): - return scm_class_boolean; - case SCM_ISYMNUM (SCM_EOL): - return scm_class_null; - default: - return scm_class_unknown; - } - } - - case scm_tc3_cons: - switch (SCM_TYP7 (x)) - { - case scm_tcs_cons_nimcar: - return scm_class_pair; - case scm_tcs_closures: - return scm_class_procedure; - case scm_tcs_symbols: - return scm_class_symbol; - case scm_tc7_vector: - case scm_tc7_wvect: -#ifdef HAVE_ARRAYS - case scm_tc7_bvect: - case scm_tc7_byvect: - case scm_tc7_svect: - case scm_tc7_ivect: - case scm_tc7_uvect: - case scm_tc7_fvect: - case scm_tc7_dvect: - case scm_tc7_cvect: -#endif - return scm_class_vector; - case scm_tc7_string: - case scm_tc7_substring: - return scm_class_string; - case scm_tc7_asubr: - case scm_tc7_subr_0: - case scm_tc7_subr_1: - case scm_tc7_cxr: - case scm_tc7_subr_3: - case scm_tc7_subr_2: - case scm_tc7_rpsubr: - case scm_tc7_subr_1o: - case scm_tc7_subr_2o: - case scm_tc7_lsubr_2: - case scm_tc7_lsubr: - if (SCM_SUBR_GENERIC (x) && *SCM_SUBR_GENERIC (x)) - return scm_class_primitive_generic; - else - return scm_class_procedure; - case scm_tc7_cclo: - return scm_class_procedure; - case scm_tc7_pws: - return scm_class_procedure_with_setter; - - case scm_tc7_smob: - { - long type = SCM_TYP16 (x); - if (type != scm_tc16_port_with_ps) - return scm_smob_class[SCM_TC2SMOBNUM (type)]; - x = SCM_PORT_WITH_PS_PORT (x); - /* fall through to ports */ - } - case scm_tc7_port: - return scm_port_class[(SCM_WRTNG & SCM_UNPACK_CAR (x) - ? (SCM_RDNG & SCM_UNPACK_CAR (x) - ? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x) - : SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x)) - : SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))]; - case scm_tcs_cons_gloc: - /* must be a struct */ - if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID) - return SCM_CLASS_OF (x); - else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS) - { - /* Goops object */ - if (! SCM_FALSEP (SCM_OBJ_CLASS_REDEF (x))) - scm_change_object_class (x, - SCM_CLASS_OF (x), /* old */ - SCM_OBJ_CLASS_REDEF (x)); /* new */ - return SCM_CLASS_OF (x); - } - else - { - /* ordinary struct */ - SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x)); - if (SCM_NFALSEP (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle)))) - return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle)); - else - { - SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle)); - SCM class = scm_make_extended_class (SCM_NFALSEP (name) - ? SCM_ROCHARS (name) - : 0); - SCM_SET_STRUCT_TABLE_CLASS (SCM_CDR (handle), class); - return class; - } - } - default: - if (SCM_CONSP (x)) - return scm_class_pair; - else - return scm_class_unknown; - } - - case scm_tc3_cons_gloc: - case scm_tc3_tc7_1: - case scm_tc3_tc7_2: - case scm_tc3_closure: - /* Never reached */ - break; - } - return scm_class_unknown; -} - -/* (SCM_IM_DISPATCH ARGS N-SPECIALIZED - * #((TYPE1 ... ENV FORMALS FORM ...) ...) - * GF) - * - * (SCM_IM_HASH_DISPATCH ARGS N-SPECIALIZED HASHSET MASK - * #((TYPE1 ... ENV FORMALS FORM ...) ...) - * GF) - * - * ARGS is either a list of expressions, in which case they - * are interpreted as the arguments of an application, or - * a non-pair, which is interpreted as a single expression - * yielding all arguments. - * - * SCM_IM_DISPATCH expressions in generic functions always - * have ARGS = the symbol `args' or the iloc #@0-0. - * - * Need FORMALS in order to support varying arity. This - * also avoids the need for renaming of bindings. - * - * We should probably not complicate this mechanism by - * introducing "optimizations" for getters and setters or - * primitive methods. Getters and setter will normally be - * compiled into @slot-[ref|set!] or a procedure call. - * They rely on the dispatch performed before executing - * the code which contains them. - * - * We might want to use a more efficient representation of - * this form in the future, perhaps after we have introduced - * low-level support for syntax-case macros. - */ - -SCM -scm_mcache_lookup_cmethod (SCM cache, SCM args) -{ - int i, n, end, mask; - SCM ls, methods, z = SCM_CDDR (cache); - n = SCM_INUM (SCM_CAR (z)); /* maximum number of specializers */ - methods = SCM_CADR (z); - - if (SCM_NIMP (methods)) - { - /* Prepare for linear search */ - mask = -1; - i = 0; - end = SCM_LENGTH (methods); - } - else - { - /* Compute a hash value */ - int hashset = SCM_INUM (methods); - int j = n; - mask = SCM_INUM (SCM_CAR (z = SCM_CDDR (z))); - methods = SCM_CADR (z); - i = 0; - ls = args; - if (SCM_NIMP (ls)) - do - { - i += SCM_STRUCT_DATA (scm_class_of (SCM_CAR (ls))) - [scm_si_hashsets + hashset]; - ls = SCM_CDR (ls); - } - while (--j && SCM_NIMP (ls)); - i &= mask; - end = i; - } - - /* Search for match */ - do - { - int j = n; - z = SCM_VELTS (methods)[i]; - ls = args; /* list of arguments */ - if (SCM_NIMP (ls)) - do - { - /* More arguments than specifiers => CLASS != ENV */ - if (! SCM_EQ_P (scm_class_of (SCM_CAR (ls)), SCM_CAR (z))) - goto next_method; - ls = SCM_CDR (ls); - z = SCM_CDR (z); - } - while (--j && SCM_NIMP (ls)); - /* Fewer arguments than specifiers => CAR != ENV */ - if (!(SCM_IMP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z)))) - goto next_method; - return z; - next_method: - i = (i + 1) & mask; - } while (i != end); - return SCM_BOOL_F; -} - -SCM -scm_mcache_compute_cmethod (SCM cache, SCM args) -{ - SCM cmethod = scm_mcache_lookup_cmethod (cache, args); - if (SCM_IMP (cmethod)) - /* No match - memoize */ - return scm_memoize_method (cache, args); - return cmethod; -} - -SCM -scm_apply_generic (SCM gf, SCM args) -{ - SCM cmethod = scm_mcache_compute_cmethod (SCM_ENTITY_PROCEDURE (gf), args); - return scm_eval_body (SCM_CDR (SCM_CMETHOD_CODE (cmethod)), - SCM_EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (cmethod)), - args, - SCM_CMETHOD_ENV (cmethod))); -} - -SCM -scm_call_generic_0 (SCM gf) -{ - return scm_apply_generic (gf, SCM_EOL); -} - -SCM -scm_call_generic_1 (SCM gf, SCM a1) -{ - return scm_apply_generic (gf, SCM_LIST1 (a1)); -} - -SCM -scm_call_generic_2 (SCM gf, SCM a1, SCM a2) -{ - return scm_apply_generic (gf, SCM_LIST2 (a1, a2)); -} - -SCM -scm_call_generic_3 (SCM gf, SCM a1, SCM a2, SCM a3) -{ - return scm_apply_generic (gf, SCM_LIST3 (a1, a2, a3)); -} - -SCM_DEFINE (scm_entity_p, "entity?", 1, 0, 0, - (SCM obj), -"") -#define FUNC_NAME s_scm_entity_p -{ - return SCM_BOOL(SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj)); -} -#undef FUNC_NAME - -SCM_DEFINE (scm_operator_p, "operator?", 1, 0, 0, - (SCM obj), -"") -#define FUNC_NAME s_scm_operator_p -{ - return SCM_BOOL(SCM_STRUCTP (obj) - && SCM_I_OPERATORP (obj) - && !SCM_I_ENTITYP (obj)); -} -#undef FUNC_NAME - -SCM_DEFINE (scm_set_object_procedure_x, "set-object-procedure!", 2, 0, 0, - (SCM obj, SCM proc), -"") -#define FUNC_NAME s_scm_set_object_procedure_x -{ - SCM_ASSERT (SCM_STRUCTP (obj) - && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR) - || (SCM_I_ENTITYP (obj) - && !(SCM_OBJ_CLASS_FLAGS (obj) - & SCM_CLASSF_PURE_GENERIC))), - obj, - SCM_ARG1, - FUNC_NAME); - SCM_VALIDATE_PROC (2,proc); - if (SCM_I_ENTITYP (obj)) - SCM_SET_ENTITY_PROCEDURE (obj, proc); - else - SCM_OPERATOR_CLASS (obj)->procedure = proc; - return SCM_UNSPECIFIED; -} -#undef FUNC_NAME - -#ifdef GUILE_DEBUG -SCM_DEFINE (scm_object_procedure, "object-procedure", 1, 0, 0, - (SCM obj), -"") -#define FUNC_NAME s_scm_object_procedure -{ - SCM_ASSERT (SCM_STRUCTP (obj) - && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR) - || SCM_I_ENTITYP (obj)), - obj, SCM_ARG1, FUNC_NAME); - return (SCM_I_ENTITYP (obj) - ? SCM_ENTITY_PROCEDURE (obj) - : SCM_OPERATOR_CLASS (obj)->procedure); -} -#undef FUNC_NAME -#endif /* GUILE_DEBUG */ - -/* The following procedures are not a part of Goops but a minimal - * object system built upon structs. They are here for those who - * want to implement their own object system. - */ - -SCM -scm_i_make_class_object (SCM meta, - SCM layout_string, - unsigned long flags) -{ - SCM c; - SCM layout = scm_make_struct_layout (layout_string); - c = scm_make_struct (meta, - SCM_INUM0, - SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL)); - SCM_SET_CLASS_FLAGS (c, flags); - return c; -} - -SCM_DEFINE (scm_make_class_object, "make-class-object", 2, 0, 0, - (SCM metaclass, SCM 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), -"") -#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_makfromstr (SCM_CHARS (pl), (scm_sizet) SCM_LENGTH (pl), 0); - return scm_i_make_class_object (SCM_STRUCT_VTABLE (class), - scm_string_append (SCM_LIST2 (pl, layout)), - SCM_CLASS_FLAGS (class)); -} -#undef FUNC_NAME - -void -scm_init_objects () -{ - SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT); - SCM ml = scm_make_struct_layout (ms); - SCM mt = scm_make_vtable_vtable (ml, SCM_INUM0, - SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL)); - - SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT); - SCM ol = scm_make_struct_layout (os); - SCM ot = scm_make_vtable_vtable (ol, SCM_INUM0, - SCM_LIST3 (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_LIST4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL)); - - scm_sysintern ("", mt); - scm_metaclass_standard = mt; - scm_sysintern ("", 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_sysintern ("", et); - -#include "objects.x" -} - -/* - Local Variables: - c-file-style: "gnu" - End: -*/ +/* Copyright (C) 1995,1996,1999,2000,2001, 2003, 2004, 2006, 2008 Free Software Foundation, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 3 of + * the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + + + + +/* This file and objects.h contains those minimal pieces of the Guile + * Object Oriented Programming System which need to be included in + * libguile. See the comments in objects.h. + */ + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include "libguile/_scm.h" + +#include "libguile/struct.h" +#include "libguile/procprop.h" +#include "libguile/chars.h" +#include "libguile/keywords.h" +#include "libguile/smob.h" +#include "libguile/eval.h" +#include "libguile/alist.h" +#include "libguile/ports.h" +#include "libguile/strings.h" +#include "libguile/vectors.h" +#include "libguile/programs.h" +#include "libguile/vm.h" + +#include "libguile/validate.h" +#include "libguile/objects.h" +#include "libguile/goops.h" + + + +SCM scm_metaclass_standard; +SCM scm_metaclass_operator; + +/* The cache argument for scm_mcache_lookup_cmethod has one of two possible + * formats: + * + * Format #1: + * (SCM_IM_DISPATCH ARGS N-SPECIALIZED + * #((TYPE1 ... ENV FORMALS FORM ...) ...) + * GF) + * + * Format #2: + * (SCM_IM_HASH_DISPATCH ARGS N-SPECIALIZED HASHSET MASK + * #((TYPE1 ... ENV FORMALS FORM ...) ...) + * GF) + * + * ARGS is either a list of expressions, in which case they + * are interpreted as the arguments of an application, or + * a non-pair, which is interpreted as a single expression + * yielding all arguments. + * + * SCM_IM_DISPATCH expressions in generic functions always + * have ARGS = the symbol `args' or the iloc #@0-0. + * + * Need FORMALS in order to support varying arity. This + * also avoids the need for renaming of bindings. + * + * We should probably not complicate this mechanism by + * introducing "optimizations" for getters and setters or + * primitive methods. Getters and setter will normally be + * compiled into @slot-[ref|set!] or a procedure call. + * They rely on the dispatch performed before executing + * the code which contains them. + * + * We might want to use a more efficient representation of + * this form in the future, perhaps after we have introduced + * low-level support for syntax-case macros. + */ + +SCM +scm_mcache_lookup_cmethod (SCM cache, SCM args) +{ + unsigned long i, mask, n, end; + SCM ls, methods, z = SCM_CDDR (cache); + n = scm_to_ulong (SCM_CAR (z)); /* maximum number of specializers */ + methods = SCM_CADR (z); + + if (scm_is_simple_vector (methods)) + { + /* cache format #1: prepare for linear search */ + mask = -1; + i = 0; + end = SCM_SIMPLE_VECTOR_LENGTH (methods); + } + else + { + /* cache format #2: compute a hash value */ + unsigned long hashset = scm_to_ulong (methods); + long j = n; + z = SCM_CDDR (z); + mask = scm_to_ulong (SCM_CAR (z)); + methods = SCM_CADR (z); + i = 0; + ls = args; + if (!scm_is_null (ls)) + do + { + i += SCM_STRUCT_DATA (scm_class_of (SCM_CAR (ls))) + [scm_si_hashsets + hashset]; + ls = SCM_CDR (ls); + } + while (j-- && !scm_is_null (ls)); + i &= mask; + end = i; + } + + /* Search for match */ + do + { + long j = n; + z = SCM_SIMPLE_VECTOR_REF (methods, i); + ls = args; /* list of arguments */ + if (!scm_is_null (ls)) + do + { + /* More arguments than specifiers => CLASS != ENV */ + if (! scm_is_eq (scm_class_of (SCM_CAR (ls)), SCM_CAR (z))) + goto next_method; + ls = SCM_CDR (ls); + z = SCM_CDR (z); + } + while (j-- && !scm_is_null (ls)); + /* Fewer arguments than specifiers => CAR != CLASS or `no-method' */ + if (!scm_is_pair (z) + || (!SCM_CLASSP (SCM_CAR (z)) && !scm_is_symbol (SCM_CAR (z)))) + return z; + next_method: + i = (i + 1) & mask; + } while (i != end); + return SCM_BOOL_F; +} + +SCM +scm_mcache_compute_cmethod (SCM cache, SCM args) +{ + SCM cmethod = scm_mcache_lookup_cmethod (cache, args); + if (scm_is_false (cmethod)) + /* No match - memoize */ + return scm_memoize_method (cache, args); + return cmethod; +} + +SCM +scm_apply_generic (SCM gf, SCM args) +{ + SCM cmethod = scm_mcache_compute_cmethod (SCM_ENTITY_PROCEDURE (gf), args); + if (SCM_PROGRAM_P (cmethod)) + return scm_vm_apply (scm_the_vm (), cmethod, args); + else if (scm_is_pair (cmethod)) + return scm_eval_body (SCM_CDR (SCM_CMETHOD_CODE (cmethod)), + SCM_EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (cmethod)), + args, + SCM_CMETHOD_ENV (cmethod))); + else + return scm_apply (cmethod, args, SCM_EOL); +} + +SCM +scm_call_generic_0 (SCM gf) +{ + return scm_apply_generic (gf, SCM_EOL); +} + +SCM +scm_call_generic_1 (SCM gf, SCM a1) +{ + return scm_apply_generic (gf, scm_list_1 (a1)); +} + +SCM +scm_call_generic_2 (SCM gf, SCM a1, SCM a2) +{ + return scm_apply_generic (gf, scm_list_2 (a1, a2)); +} + +SCM +scm_call_generic_3 (SCM gf, SCM a1, SCM a2, SCM a3) +{ + return scm_apply_generic (gf, scm_list_3 (a1, a2, a3)); +} + +SCM_DEFINE (scm_entity_p, "entity?", 1, 0, 0, + (SCM obj), + "Return @code{#t} if @var{obj} is an entity.") +#define FUNC_NAME s_scm_entity_p +{ + return scm_from_bool(SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_operator_p, "operator?", 1, 0, 0, + (SCM obj), + "Return @code{#t} if @var{obj} is an operator.") +#define FUNC_NAME s_scm_operator_p +{ + return scm_from_bool(SCM_STRUCTP (obj) + && SCM_I_OPERATORP (obj) + && !SCM_I_ENTITYP (obj)); +} +#undef FUNC_NAME + +/* XXX - What code requires the object procedure to be only of certain + types? */ + +SCM_DEFINE (scm_valid_object_procedure_p, "valid-object-procedure?", 1, 0, 0, + (SCM proc), + "Return @code{#t} iff @var{proc} is a procedure that can be used " + "with @code{set-object-procedure}. It is always valid to use " + "a closure constructed by @code{lambda}.") +#define FUNC_NAME s_scm_valid_object_procedure_p +{ + if (SCM_IMP (proc)) + return SCM_BOOL_F; + switch (SCM_TYP7 (proc)) + { + default: + return SCM_BOOL_F; + case scm_tcs_closures: + case scm_tc7_subr_1: + case scm_tc7_subr_2: + case scm_tc7_subr_3: + case scm_tc7_lsubr_2: + return SCM_BOOL_T; + } +} +#undef FUNC_NAME + +SCM_DEFINE (scm_set_object_procedure_x, "set-object-procedure!", 2, 0, 0, + (SCM obj, SCM proc), + "Set the object procedure of @var{obj} to @var{proc}.\n" + "@var{obj} must be either an entity or an operator.") +#define FUNC_NAME s_scm_set_object_procedure_x +{ + SCM_ASSERT (SCM_STRUCTP (obj) + && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR) + || (SCM_I_ENTITYP (obj) + && !(SCM_OBJ_CLASS_FLAGS (obj) + & SCM_CLASSF_PURE_GENERIC))), + obj, + SCM_ARG1, + FUNC_NAME); + SCM_ASSERT (scm_valid_object_procedure_p (proc), proc, SCM_ARG2, FUNC_NAME); + if (SCM_I_ENTITYP (obj)) + SCM_SET_ENTITY_PROCEDURE (obj, proc); + else + SCM_OPERATOR_CLASS (obj)->procedure = proc; + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +#ifdef GUILE_DEBUG +SCM_DEFINE (scm_object_procedure, "object-procedure", 1, 0, 0, + (SCM obj), + "Return the object procedure of @var{obj}. @var{obj} must be\n" + "an entity or an operator.") +#define FUNC_NAME s_scm_object_procedure +{ + SCM_ASSERT (SCM_STRUCTP (obj) + && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR) + || SCM_I_ENTITYP (obj)), + obj, SCM_ARG1, FUNC_NAME); + return (SCM_I_ENTITYP (obj) + ? SCM_ENTITY_PROCEDURE (obj) + : SCM_OPERATOR_CLASS (obj)->procedure); +} +#undef FUNC_NAME +#endif /* GUILE_DEBUG */ + +/* The following procedures are not a part of Goops but a minimal + * object system built upon structs. They are here for those who + * want to implement their own object system. + */ + +SCM +scm_i_make_class_object (SCM meta, + SCM layout_string, + unsigned long flags) +{ + SCM c; + SCM layout = scm_make_struct_layout (layout_string); + c = scm_make_struct (meta, + SCM_INUM0, + scm_list_4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL)); + SCM_SET_CLASS_FLAGS (c, flags); + return c; +} + +SCM_DEFINE (scm_make_class_object, "make-class-object", 2, 0, 0, + (SCM metaclass, SCM layout), + "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_is_eq (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]); + pl = scm_symbol_to_string (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_from_locale_string (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_from_locale_string (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_from_locale_string (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 ("", mt); + scm_metaclass_standard = mt; + scm_c_define ("", ot); + scm_metaclass_operator = ot; + SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY); + scm_c_define ("", et); + +#include "libguile/objects.x" +} + +/* + Local Variables: + c-file-style: "gnu" + End: +*/