--- /dev/null
+/* Copyright (C) 1998,1999,2000,2001,2002,2003,2004,2008
+ * 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 2.1 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
+ */
+\f
+
+/* This software is a derivative work of other copyrighted softwares; the
+ * copyright notices of these softwares are placed in the file COPYRIGHTS
+ *
+ * This file is based upon stklos.c from the STk distribution by
+ * Erick Gallesio <eg@unice.fr>.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <assert.h>
+
+#include "libguile/_scm.h"
+#include "libguile/alist.h"
+#include "libguile/async.h"
+#include "libguile/chars.h"
+#include "libguile/debug.h"
+#include "libguile/dynl.h"
+#include "libguile/dynwind.h"
+#include "libguile/eval.h"
+#include "libguile/hashtab.h"
+#include "libguile/keywords.h"
+#include "libguile/macros.h"
+#include "libguile/modules.h"
+#include "libguile/objects.h"
+#include "libguile/ports.h"
+#include "libguile/procprop.h"
+#include "libguile/random.h"
+#include "libguile/root.h"
+#include "libguile/smob.h"
+#include "libguile/strings.h"
+#include "libguile/strports.h"
+#include "libguile/vectors.h"
+#include "libguile/weaks.h"
+
+#include "libguile/validate.h"
+#include "libguile/goops.h"
+
+#define SPEC_OF(x) SCM_SLOT (x, scm_si_specializers)
+
+#define DEFVAR(v, val) \
+{ scm_eval (scm_list_3 (scm_sym_define_public, (v), (val)), \
+ scm_module_goops); }
+/* Temporary hack until we get the new module system */
+/*fixme* Should optimize by keeping track of the variable object itself */
+#define GETVAR(v) (SCM_VARIABLE_REF (scm_call_2 (scm_goops_lookup_closure, \
+ (v), SCM_BOOL_F)))
+
+/* Fixme: Should use already interned symbols */
+
+#define CALL_GF1(name, a) (scm_call_1 (GETVAR (scm_from_locale_symbol (name)), \
+ a))
+#define CALL_GF2(name, a, b) (scm_call_2 (GETVAR (scm_from_locale_symbol (name)), \
+ a, b))
+#define CALL_GF3(name, a, b, c) (scm_call_3 (GETVAR (scm_from_locale_symbol (name)), \
+ a, b, c))
+#define CALL_GF4(name, a, b, c, d) (scm_call_4 (GETVAR (scm_from_locale_symbol (name)), \
+ a, b, c, d))
+
+/* Class redefinition protocol:
+
+ A class is represented by a heap header h1 which points to a
+ malloc:ed memory block m1.
+
+ When a new version of a class is created, a new header h2 and
+ memory block m2 are allocated. The headers h1 and h2 then switch
+ pointers so that h1 refers to m2 and h2 to m1. In this way, names
+ bound to h1 will point to the new class at the same time as h2 will
+ be a handle which the GC will use to free m1.
+
+ The `redefined' slot of m1 will be set to point to h1. An old
+ instance will have its class pointer (the CAR of the heap header)
+ pointing to m1. The non-immediate `redefined'-slot in m1 indicates
+ the class modification and the new class pointer can be found via
+ h1.
+*/
+
+/* The following definition is located in libguile/objects.h:
+#define SCM_OBJ_CLASS_REDEF(x) (SCM_STRUCT_VTABLE_DATA(x)[scm_si_redefined])
+*/
+
+#define TEST_CHANGE_CLASS(obj, class) \
+ { \
+ class = SCM_CLASS_OF (obj); \
+ if (scm_is_true (SCM_OBJ_CLASS_REDEF (obj))) \
+ { \
+ scm_change_object_class (obj, class, SCM_OBJ_CLASS_REDEF (obj));\
+ class = SCM_CLASS_OF (obj); \
+ } \
+ }
+
+#define NXT_MTHD_METHODS(m) (SCM_VELTS (m)[1])
+#define NXT_MTHD_ARGS(m) (SCM_VELTS (m)[2])
+
+#define SCM_GOOPS_UNBOUND SCM_UNBOUND
+#define SCM_GOOPS_UNBOUNDP(x) ((x) == SCM_GOOPS_UNBOUND)
+
+static int goops_loaded_p = 0;
+static scm_t_rstate *goops_rstate;
+
+static SCM scm_goops_lookup_closure;
+
+/* 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_class_fraction;
+SCM scm_class_unknown;
+SCM scm_class_top, scm_class_object, scm_class_class;
+SCM scm_class_applicable;
+SCM scm_class_entity, scm_class_entity_with_setter;
+SCM scm_class_generic, scm_class_generic_with_setter;
+SCM scm_class_accessor;
+SCM scm_class_extended_generic, scm_class_extended_generic_with_setter;
+SCM scm_class_extended_accessor;
+SCM scm_class_method;
+SCM scm_class_simple_method, scm_class_accessor_method;
+SCM scm_class_procedure_class;
+SCM scm_class_operator_class, scm_class_operator_with_setter_class;
+SCM scm_class_entity_class;
+SCM scm_class_number, scm_class_list;
+SCM scm_class_keyword;
+SCM scm_class_port, scm_class_input_output_port;
+SCM scm_class_input_port, scm_class_output_port;
+SCM scm_class_foreign_class, scm_class_foreign_object;
+SCM scm_class_foreign_slot;
+SCM scm_class_self, scm_class_protected;
+SCM scm_class_opaque, scm_class_read_only;
+SCM scm_class_protected_opaque, scm_class_protected_read_only;
+SCM scm_class_scm;
+SCM scm_class_int, scm_class_float, scm_class_double;
+
+SCM *scm_port_class = 0;
+SCM *scm_smob_class = 0;
+
+SCM scm_no_applicable_method;
+
+SCM_SYMBOL (scm_sym_define_public, "define-public");
+
+static SCM scm_make_unbound (void);
+static SCM scm_unbound_p (SCM obj);
+static SCM scm_assert_bound (SCM value, SCM obj);
+static SCM scm_at_assert_bound_ref (SCM obj, SCM index);
+static SCM scm_sys_goops_loaded (void);
+
+/* This function is used for efficient type dispatch. */
+SCM_DEFINE (scm_class_of, "class-of", 1, 0, 0,
+ (SCM x),
+ "Return the class of @var{x}.")
+#define FUNC_NAME s_scm_class_of
+{
+ 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 if (scm_is_bool (x))
+ return scm_class_boolean;
+ else if (scm_is_null (x))
+ return scm_class_null;
+ else
+ 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_tc7_symbol:
+ return scm_class_symbol;
+ case scm_tc7_vector:
+ case scm_tc7_wvect:
+ return scm_class_vector;
+ case scm_tc7_string:
+ return scm_class_string;
+ case scm_tc7_number:
+ switch SCM_TYP16 (x) {
+ case scm_tc16_big:
+ return scm_class_integer;
+ case scm_tc16_real:
+ return scm_class_real;
+ case scm_tc16_complex:
+ return scm_class_complex;
+ case scm_tc16_fraction:
+ return scm_class_fraction;
+ }
+ case scm_tc7_asubr:
+ case scm_tc7_subr_0:
+ case scm_tc7_subr_1:
+ case scm_tc7_dsubr:
+ 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:
+ {
+ scm_t_bits 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_CELL_WORD_0 (x)
+ ? (SCM_RDNG & SCM_CELL_WORD_0 (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_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_is_false (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_is_true (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_is_true (name)
+ ? scm_i_symbol_chars (name)
+ : 0,
+ SCM_I_OPERATORP (x));
+ SCM_SET_STRUCT_TABLE_CLASS (SCM_CDR (handle), class);
+ return class;
+ }
+ }
+ default:
+ if (scm_is_pair (x))
+ return scm_class_pair;
+ else
+ return scm_class_unknown;
+ }
+
+ case scm_tc3_struct:
+ case scm_tc3_tc7_1:
+ case scm_tc3_tc7_2:
+ case scm_tc3_closure:
+ /* Never reached */
+ break;
+ }
+ return scm_class_unknown;
+}
+#undef FUNC_NAME
+
+/******************************************************************************
+ *
+ * Compute-cpl
+ *
+ * This version doesn't fully handle multiple-inheritance. It serves
+ * only for booting classes and will be overloaded in Scheme
+ *
+ ******************************************************************************/
+
+static SCM
+map (SCM (*proc) (SCM), SCM ls)
+{
+ if (scm_is_null (ls))
+ return ls;
+ else
+ {
+ SCM res = scm_cons (proc (SCM_CAR (ls)), SCM_EOL);
+ SCM h = res;
+ ls = SCM_CDR (ls);
+ while (!scm_is_null (ls))
+ {
+ SCM_SETCDR (h, scm_cons (proc (SCM_CAR (ls)), SCM_EOL));
+ h = SCM_CDR (h);
+ ls = SCM_CDR (ls);
+ }
+ return res;
+ }
+}
+
+static SCM
+filter_cpl (SCM ls)
+{
+ SCM res = SCM_EOL;
+ while (!scm_is_null (ls))
+ {
+ SCM el = SCM_CAR (ls);
+ if (scm_is_false (scm_c_memq (el, res)))
+ res = scm_cons (el, res);
+ ls = SCM_CDR (ls);
+ }
+ return res;
+}
+
+static SCM
+compute_cpl (SCM class)
+{
+ if (goops_loaded_p)
+ return CALL_GF1 ("compute-cpl", class);
+ else
+ {
+ SCM supers = SCM_SLOT (class, scm_si_direct_supers);
+ SCM ls = scm_append (scm_acons (class, supers,
+ map (compute_cpl, supers)));
+ return scm_reverse_x (filter_cpl (ls), SCM_EOL);
+ }
+}
+
+/******************************************************************************
+ *
+ * compute-slots
+ *
+ ******************************************************************************/
+
+static SCM
+remove_duplicate_slots (SCM l, SCM res, SCM slots_already_seen)
+{
+ SCM tmp;
+
+ if (scm_is_null (l))
+ return res;
+
+ tmp = SCM_CAAR (l);
+ if (!scm_is_symbol (tmp))
+ scm_misc_error ("%compute-slots", "bad slot name ~S", scm_list_1 (tmp));
+
+ if (scm_is_false (scm_c_memq (tmp, slots_already_seen))) {
+ res = scm_cons (SCM_CAR (l), res);
+ slots_already_seen = scm_cons (tmp, slots_already_seen);
+ }
+
+ return remove_duplicate_slots (SCM_CDR (l), res, slots_already_seen);
+}
+
+static SCM
+build_slots_list (SCM dslots, SCM cpl)
+{
+ register SCM res = dslots;
+
+ for (cpl = SCM_CDR (cpl); !scm_is_null (cpl); cpl = SCM_CDR (cpl))
+ res = scm_append (scm_list_2 (SCM_SLOT (SCM_CAR (cpl),
+ scm_si_direct_slots),
+ res));
+
+ /* res contains a list of slots. Remove slots which appears more than once */
+ return remove_duplicate_slots (scm_reverse (res), SCM_EOL, SCM_EOL);
+}
+
+static SCM
+maplist (SCM ls)
+{
+ SCM orig = ls;
+ while (!scm_is_null (ls))
+ {
+ if (!scm_is_pair (SCM_CAR (ls)))
+ SCM_SETCAR (ls, scm_cons (SCM_CAR (ls), SCM_EOL));
+ ls = SCM_CDR (ls);
+ }
+ return orig;
+}
+
+
+SCM_DEFINE (scm_sys_compute_slots, "%compute-slots", 1, 0, 0,
+ (SCM class),
+ "Return a list consisting of the names of all slots belonging to\n"
+ "class @var{class}, i. e. the slots of @var{class} and of all of\n"
+ "its superclasses.")
+#define FUNC_NAME s_scm_sys_compute_slots
+{
+ SCM_VALIDATE_CLASS (1, class);
+ return build_slots_list (SCM_SLOT (class, scm_si_direct_slots),
+ SCM_SLOT (class, scm_si_cpl));
+}
+#undef FUNC_NAME
+
+
+/******************************************************************************
+ *
+ * compute-getters-n-setters
+ *
+ * This version doesn't handle slot options. It serves only for booting
+ * classes and will be overloaded in Scheme.
+ *
+ ******************************************************************************/
+
+SCM_KEYWORD (k_init_value, "init-value");
+SCM_KEYWORD (k_init_thunk, "init-thunk");
+
+static SCM
+compute_getters_n_setters (SCM slots)
+{
+ SCM res = SCM_EOL;
+ SCM *cdrloc = &res;
+ long i = 0;
+
+ for ( ; !scm_is_null (slots); slots = SCM_CDR (slots))
+ {
+ SCM init = SCM_BOOL_F;
+ SCM options = SCM_CDAR (slots);
+ if (!scm_is_null (options))
+ {
+ init = scm_get_keyword (k_init_value, options, 0);
+ if (init)
+ {
+ init = scm_i_eval_x (scm_list_3 (scm_sym_lambda,
+ SCM_EOL,
+ scm_list_2 (scm_sym_quote,
+ init)),
+ SCM_EOL);
+ }
+ else
+ init = scm_get_keyword (k_init_thunk, options, SCM_BOOL_F);
+ }
+ *cdrloc = scm_cons (scm_cons (SCM_CAAR (slots),
+ scm_cons (init,
+ scm_from_int (i++))),
+ SCM_EOL);
+ cdrloc = SCM_CDRLOC (*cdrloc);
+ }
+ return res;
+}
+
+/******************************************************************************
+ *
+ * initialize-object
+ *
+ ******************************************************************************/
+
+/*fixme* Manufacture keywords in advance */
+SCM
+scm_i_get_keyword (SCM key, SCM l, long len, SCM default_value, const char *subr)
+{
+ long i;
+
+ for (i = 0; i != len; i += 2)
+ {
+ SCM obj = SCM_CAR (l);
+
+ if (!scm_is_keyword (obj))
+ scm_misc_error (subr, "bad keyword: ~S", scm_list_1 (obj));
+ else if (scm_is_eq (obj, key))
+ return SCM_CADR (l);
+ else
+ l = SCM_CDDR (l);
+ }
+
+ return default_value;
+}
+
+
+SCM_DEFINE (scm_get_keyword, "get-keyword", 3, 0, 0,
+ (SCM key, SCM l, SCM default_value),
+ "Determine an associated value for the keyword @var{key} from\n"
+ "the list @var{l}. The list @var{l} has to consist of an even\n"
+ "number of elements, where, starting with the first, every\n"
+ "second element is a keyword, followed by its associated value.\n"
+ "If @var{l} does not hold a value for @var{key}, the value\n"
+ "@var{default_value} is returned.")
+#define FUNC_NAME s_scm_get_keyword
+{
+ long len;
+
+ SCM_ASSERT (scm_is_keyword (key), key, SCM_ARG1, FUNC_NAME);
+ len = scm_ilength (l);
+ if (len < 0 || len % 2 == 1)
+ scm_misc_error (FUNC_NAME, "Bad keyword-value list: ~S", scm_list_1 (l));
+
+ return scm_i_get_keyword (key, l, len, default_value, FUNC_NAME);
+}
+#undef FUNC_NAME
+
+
+SCM_KEYWORD (k_init_keyword, "init-keyword");
+
+static SCM get_slot_value (SCM class, SCM obj, SCM slotdef);
+static SCM set_slot_value (SCM class, SCM obj, SCM slotdef, SCM value);
+
+SCM_DEFINE (scm_sys_initialize_object, "%initialize-object", 2, 0, 0,
+ (SCM obj, SCM initargs),
+ "Initialize the object @var{obj} with the given arguments\n"
+ "@var{initargs}.")
+#define FUNC_NAME s_scm_sys_initialize_object
+{
+ SCM tmp, get_n_set, slots;
+ SCM class = SCM_CLASS_OF (obj);
+ long n_initargs;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ n_initargs = scm_ilength (initargs);
+ SCM_ASSERT ((n_initargs & 1) == 0, initargs, SCM_ARG2, FUNC_NAME);
+
+ get_n_set = SCM_SLOT (class, scm_si_getters_n_setters);
+ slots = SCM_SLOT (class, scm_si_slots);
+
+ /* See for each slot how it must be initialized */
+ for (;
+ !scm_is_null (slots);
+ get_n_set = SCM_CDR (get_n_set), slots = SCM_CDR (slots))
+ {
+ SCM slot_name = SCM_CAR (slots);
+ SCM slot_value = 0;
+
+ if (!scm_is_null (SCM_CDR (slot_name)))
+ {
+ /* This slot admits (perhaps) to be initialized at creation time */
+ long n = scm_ilength (SCM_CDR (slot_name));
+ if (n & 1) /* odd or -1 */
+ SCM_MISC_ERROR ("class contains bogus slot definition: ~S",
+ scm_list_1 (slot_name));
+ tmp = scm_i_get_keyword (k_init_keyword,
+ SCM_CDR (slot_name),
+ n,
+ 0,
+ FUNC_NAME);
+ slot_name = SCM_CAR (slot_name);
+ if (tmp)
+ {
+ /* an initarg was provided for this slot */
+ if (!scm_is_keyword (tmp))
+ SCM_MISC_ERROR ("initarg must be a keyword. It was ~S",
+ scm_list_1 (tmp));
+ slot_value = scm_i_get_keyword (tmp,
+ initargs,
+ n_initargs,
+ 0,
+ FUNC_NAME);
+ }
+ }
+
+ if (slot_value)
+ /* set slot to provided value */
+ set_slot_value (class, obj, SCM_CAR (get_n_set), slot_value);
+ else
+ {
+ /* set slot to its :init-form if it exists */
+ tmp = SCM_CADAR (get_n_set);
+ if (scm_is_true (tmp))
+ {
+ slot_value = get_slot_value (class, obj, SCM_CAR (get_n_set));
+ if (SCM_GOOPS_UNBOUNDP (slot_value))
+ {
+ SCM env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, SCM_ENV (tmp));
+ set_slot_value (class,
+ obj,
+ SCM_CAR (get_n_set),
+ scm_eval_body (SCM_CLOSURE_BODY (tmp), env));
+ }
+ }
+ }
+ }
+
+ return obj;
+}
+#undef FUNC_NAME
+
+/* NOTE: The following macros are interdependent with code
+ * in goops.scm:compute-getters-n-setters
+ */
+#define SCM_GNS_INSTANCE_ALLOCATED_P(gns) \
+ (SCM_I_INUMP (SCM_CDDR (gns)) \
+ || (scm_is_pair (SCM_CDDR (gns)) \
+ && scm_is_pair (SCM_CDDDR (gns)) \
+ && scm_is_pair (SCM_CDDDDR (gns))))
+#define SCM_GNS_INDEX(gns) \
+ (SCM_I_INUMP (SCM_CDDR (gns)) \
+ ? SCM_I_INUM (SCM_CDDR (gns)) \
+ : scm_to_long (SCM_CAR (SCM_CDDDDR (gns))))
+#define SCM_GNS_SIZE(gns) \
+ (SCM_I_INUMP (SCM_CDDR (gns)) \
+ ? 1 \
+ : scm_to_long (SCM_CADR (SCM_CDDDDR (gns))))
+
+SCM_KEYWORD (k_class, "class");
+SCM_KEYWORD (k_allocation, "allocation");
+SCM_KEYWORD (k_instance, "instance");
+
+SCM_DEFINE (scm_sys_prep_layout_x, "%prep-layout!", 1, 0, 0,
+ (SCM class),
+ "")
+#define FUNC_NAME s_scm_sys_prep_layout_x
+{
+ SCM slots, getters_n_setters, nfields;
+ unsigned long int n, i;
+ char *s;
+ SCM layout;
+
+ SCM_VALIDATE_INSTANCE (1, class);
+ slots = SCM_SLOT (class, scm_si_slots);
+ getters_n_setters = SCM_SLOT (class, scm_si_getters_n_setters);
+ nfields = SCM_SLOT (class, scm_si_nfields);
+ if (!SCM_I_INUMP (nfields) || SCM_I_INUM (nfields) < 0)
+ SCM_MISC_ERROR ("bad value in nfields slot: ~S",
+ scm_list_1 (nfields));
+ n = 2 * SCM_I_INUM (nfields);
+ if (n < sizeof (SCM_CLASS_CLASS_LAYOUT) - 1
+ && SCM_SUBCLASSP (class, scm_class_class))
+ SCM_MISC_ERROR ("class object doesn't have enough fields: ~S",
+ scm_list_1 (nfields));
+
+ layout = scm_i_make_string (n, &s);
+ i = 0;
+ while (scm_is_pair (getters_n_setters))
+ {
+ if (SCM_GNS_INSTANCE_ALLOCATED_P (SCM_CAR (getters_n_setters)))
+ {
+ SCM type;
+ int len, index, size;
+ char p, a;
+
+ if (i >= n || !scm_is_pair (slots))
+ goto inconsistent;
+
+ /* extract slot type */
+ len = scm_ilength (SCM_CDAR (slots));
+ type = scm_i_get_keyword (k_class, SCM_CDAR (slots),
+ len, SCM_BOOL_F, FUNC_NAME);
+ /* determine slot GC protection and access mode */
+ if (scm_is_false (type))
+ {
+ p = 'p';
+ a = 'w';
+ }
+ else
+ {
+ if (!SCM_CLASSP (type))
+ SCM_MISC_ERROR ("bad slot class", SCM_EOL);
+ else if (SCM_SUBCLASSP (type, scm_class_foreign_slot))
+ {
+ if (SCM_SUBCLASSP (type, scm_class_self))
+ p = 's';
+ else if (SCM_SUBCLASSP (type, scm_class_protected))
+ p = 'p';
+ else
+ p = 'u';
+
+ if (SCM_SUBCLASSP (type, scm_class_opaque))
+ a = 'o';
+ else if (SCM_SUBCLASSP (type, scm_class_read_only))
+ a = 'r';
+ else
+ a = 'w';
+ }
+ else
+ {
+ p = 'p';
+ a = 'w';
+ }
+ }
+
+ index = SCM_GNS_INDEX (SCM_CAR (getters_n_setters));
+ if (index != (i >> 1))
+ goto inconsistent;
+ size = SCM_GNS_SIZE (SCM_CAR (getters_n_setters));
+ while (size)
+ {
+ s[i++] = p;
+ s[i++] = a;
+ --size;
+ }
+ }
+ slots = SCM_CDR (slots);
+ getters_n_setters = SCM_CDR (getters_n_setters);
+ }
+ if (!scm_is_null (slots))
+ {
+ inconsistent:
+ SCM_MISC_ERROR ("inconsistent getters-n-setters", SCM_EOL);
+ }
+ SCM_SET_SLOT (class, scm_si_layout, scm_string_to_symbol (layout));
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+static void prep_hashsets (SCM);
+
+SCM_DEFINE (scm_sys_inherit_magic_x, "%inherit-magic!", 2, 0, 0,
+ (SCM class, SCM dsupers),
+ "")
+#define FUNC_NAME s_scm_sys_inherit_magic_x
+{
+ SCM ls = dsupers;
+ long flags = 0;
+ SCM_VALIDATE_INSTANCE (1, class);
+ while (!scm_is_null (ls))
+ {
+ SCM_ASSERT (scm_is_pair (ls)
+ && SCM_INSTANCEP (SCM_CAR (ls)),
+ dsupers,
+ SCM_ARG2,
+ FUNC_NAME);
+ flags |= SCM_CLASS_FLAGS (SCM_CAR (ls));
+ ls = SCM_CDR (ls);
+ }
+ flags &= SCM_CLASSF_INHERIT;
+ if (flags & SCM_CLASSF_ENTITY)
+ SCM_SET_CLASS_DESTRUCTOR (class, scm_struct_free_entity);
+ else
+ {
+ long n = SCM_I_INUM (SCM_SLOT (class, scm_si_nfields));
+#if 0
+ /*
+ * We could avoid calling scm_gc_malloc in the allocation code
+ * (in which case the following two lines are needed). Instead
+ * we make 0-slot instances non-light, so that the light case
+ * can be handled without special cases.
+ */
+ if (n == 0)
+ SCM_SET_CLASS_DESTRUCTOR (class, scm_struct_free_0);
+#endif
+ if (n > 0 && !(flags & SCM_CLASSF_METACLASS))
+ {
+ /* NOTE: The following depends on scm_struct_i_size. */
+ flags |= SCM_STRUCTF_LIGHT + n * sizeof (SCM); /* use light representation */
+ SCM_SET_CLASS_DESTRUCTOR (class, scm_struct_free_light);
+ }
+ }
+ SCM_SET_CLASS_FLAGS (class, flags);
+
+ prep_hashsets (class);
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+static void
+prep_hashsets (SCM class)
+{
+ unsigned int i;
+
+ for (i = 0; i < 7; ++i)
+ SCM_SET_HASHSET (class, i, scm_c_uniform32 (goops_rstate));
+}
+
+/******************************************************************************/
+
+SCM
+scm_basic_basic_make_class (SCM class, SCM name, SCM dsupers, SCM dslots)
+{
+ SCM z, cpl, slots, nfields, g_n_s;
+
+ /* Allocate one instance */
+ z = scm_make_struct (class, SCM_INUM0, SCM_EOL);
+
+ /* Initialize its slots */
+ SCM_SET_SLOT (z, scm_si_direct_supers, dsupers);
+ cpl = compute_cpl (z);
+ slots = build_slots_list (maplist (dslots), cpl);
+ nfields = scm_from_int (scm_ilength (slots));
+ g_n_s = compute_getters_n_setters (slots);
+
+ SCM_SET_SLOT (z, scm_si_name, name);
+ SCM_SET_SLOT (z, scm_si_direct_slots, dslots);
+ SCM_SET_SLOT (z, scm_si_direct_subclasses, SCM_EOL);
+ SCM_SET_SLOT (z, scm_si_direct_methods, SCM_EOL);
+ SCM_SET_SLOT (z, scm_si_cpl, cpl);
+ SCM_SET_SLOT (z, scm_si_slots, slots);
+ SCM_SET_SLOT (z, scm_si_nfields, nfields);
+ SCM_SET_SLOT (z, scm_si_getters_n_setters, g_n_s);
+ SCM_SET_SLOT (z, scm_si_redefined, SCM_BOOL_F);
+ SCM_SET_SLOT (z, scm_si_environment,
+ scm_top_level_env (SCM_TOP_LEVEL_LOOKUP_CLOSURE));
+
+ /* Add this class in the direct-subclasses slot of dsupers */
+ {
+ SCM tmp;
+ for (tmp = dsupers; !scm_is_null (tmp); tmp = SCM_CDR (tmp))
+ SCM_SET_SLOT (SCM_CAR (tmp), scm_si_direct_subclasses,
+ scm_cons (z, SCM_SLOT (SCM_CAR (tmp),
+ scm_si_direct_subclasses)));
+ }
+
+ /* Support for the underlying structs: */
+ SCM_SET_CLASS_FLAGS (z, (class == scm_class_entity_class
+ ? (SCM_CLASSF_GOOPS_OR_VALID
+ | SCM_CLASSF_OPERATOR
+ | SCM_CLASSF_ENTITY)
+ : class == scm_class_operator_class
+ ? SCM_CLASSF_GOOPS_OR_VALID | SCM_CLASSF_OPERATOR
+ : SCM_CLASSF_GOOPS_OR_VALID));
+ return z;
+}
+
+SCM
+scm_basic_make_class (SCM class, SCM name, SCM dsupers, SCM dslots)
+{
+ SCM z = scm_basic_basic_make_class (class, name, dsupers, dslots);
+ scm_sys_inherit_magic_x (z, dsupers);
+ scm_sys_prep_layout_x (z);
+ return z;
+}
+
+/******************************************************************************/
+
+SCM_SYMBOL (sym_layout, "layout");
+SCM_SYMBOL (sym_vcell, "vcell");
+SCM_SYMBOL (sym_vtable, "vtable");
+SCM_SYMBOL (sym_print, "print");
+SCM_SYMBOL (sym_procedure, "procedure");
+SCM_SYMBOL (sym_setter, "setter");
+SCM_SYMBOL (sym_redefined, "redefined");
+SCM_SYMBOL (sym_h0, "h0");
+SCM_SYMBOL (sym_h1, "h1");
+SCM_SYMBOL (sym_h2, "h2");
+SCM_SYMBOL (sym_h3, "h3");
+SCM_SYMBOL (sym_h4, "h4");
+SCM_SYMBOL (sym_h5, "h5");
+SCM_SYMBOL (sym_h6, "h6");
+SCM_SYMBOL (sym_h7, "h7");
+SCM_SYMBOL (sym_name, "name");
+SCM_SYMBOL (sym_direct_supers, "direct-supers");
+SCM_SYMBOL (sym_direct_slots, "direct-slots");
+SCM_SYMBOL (sym_direct_subclasses, "direct-subclasses");
+SCM_SYMBOL (sym_direct_methods, "direct-methods");
+SCM_SYMBOL (sym_cpl, "cpl");
+SCM_SYMBOL (sym_default_slot_definition_class, "default-slot-definition-class");
+SCM_SYMBOL (sym_slots, "slots");
+SCM_SYMBOL (sym_getters_n_setters, "getters-n-setters");
+SCM_SYMBOL (sym_keyword_access, "keyword-access");
+SCM_SYMBOL (sym_nfields, "nfields");
+SCM_SYMBOL (sym_environment, "environment");
+
+
+static SCM
+build_class_class_slots ()
+{
+ return scm_list_n (
+ scm_list_3 (sym_layout, k_class, scm_class_protected_read_only),
+ scm_list_3 (sym_vtable, k_class, scm_class_self),
+ scm_list_1 (sym_print),
+ scm_list_3 (sym_procedure, k_class, scm_class_protected_opaque),
+ scm_list_3 (sym_setter, k_class, scm_class_protected_opaque),
+ scm_list_1 (sym_redefined),
+ scm_list_3 (sym_h0, k_class, scm_class_int),
+ scm_list_3 (sym_h1, k_class, scm_class_int),
+ scm_list_3 (sym_h2, k_class, scm_class_int),
+ scm_list_3 (sym_h3, k_class, scm_class_int),
+ scm_list_3 (sym_h4, k_class, scm_class_int),
+ scm_list_3 (sym_h5, k_class, scm_class_int),
+ scm_list_3 (sym_h6, k_class, scm_class_int),
+ scm_list_3 (sym_h7, k_class, scm_class_int),
+ scm_list_1 (sym_name),
+ scm_list_1 (sym_direct_supers),
+ scm_list_1 (sym_direct_slots),
+ scm_list_1 (sym_direct_subclasses),
+ scm_list_1 (sym_direct_methods),
+ scm_list_1 (sym_cpl),
+ scm_list_1 (sym_default_slot_definition_class),
+ scm_list_1 (sym_slots),
+ scm_list_1 (sym_getters_n_setters),
+ scm_list_1 (sym_keyword_access),
+ scm_list_1 (sym_nfields),
+ scm_list_1 (sym_environment),
+ SCM_UNDEFINED);
+}
+
+static void
+create_basic_classes (void)
+{
+ /* SCM slots_of_class = build_class_class_slots (); */
+
+ /**** <scm_class_class> ****/
+ SCM cs = scm_from_locale_string (SCM_CLASS_CLASS_LAYOUT
+ + 2 * scm_vtable_offset_user);
+ SCM name = scm_from_locale_symbol ("<class>");
+ scm_class_class = scm_permanent_object (scm_make_vtable_vtable (cs,
+ SCM_INUM0,
+ SCM_EOL));
+ SCM_SET_CLASS_FLAGS (scm_class_class, (SCM_CLASSF_GOOPS_OR_VALID
+ | SCM_CLASSF_METACLASS));
+
+ SCM_SET_SLOT (scm_class_class, scm_si_name, name);
+ SCM_SET_SLOT (scm_class_class, scm_si_direct_supers, SCM_EOL); /* will be changed */
+ /* SCM_SET_SLOT (scm_class_class, scm_si_direct_slots, slots_of_class); */
+ SCM_SET_SLOT (scm_class_class, scm_si_direct_subclasses, SCM_EOL);
+ SCM_SET_SLOT (scm_class_class, scm_si_direct_methods, SCM_EOL);
+ SCM_SET_SLOT (scm_class_class, scm_si_cpl, SCM_EOL); /* will be changed */
+ /* SCM_SET_SLOT (scm_class_class, scm_si_slots, slots_of_class); */
+ SCM_SET_SLOT (scm_class_class, scm_si_nfields, scm_from_int (SCM_N_CLASS_SLOTS));
+ /* SCM_SET_SLOT (scm_class_class, scm_si_getters_n_setters,
+ compute_getters_n_setters (slots_of_class)); */
+ SCM_SET_SLOT (scm_class_class, scm_si_redefined, SCM_BOOL_F);
+ SCM_SET_SLOT (scm_class_class, scm_si_environment,
+ scm_top_level_env (SCM_TOP_LEVEL_LOOKUP_CLOSURE));
+
+ prep_hashsets (scm_class_class);
+
+ DEFVAR(name, scm_class_class);
+
+ /**** <scm_class_top> ****/
+ name = scm_from_locale_symbol ("<top>");
+ scm_class_top = scm_permanent_object (scm_basic_make_class (scm_class_class,
+ name,
+ SCM_EOL,
+ SCM_EOL));
+
+ DEFVAR(name, scm_class_top);
+
+ /**** <scm_class_object> ****/
+ name = scm_from_locale_symbol ("<object>");
+ scm_class_object = scm_permanent_object (scm_basic_make_class (scm_class_class,
+ name,
+ scm_list_1 (scm_class_top),
+ SCM_EOL));
+
+ DEFVAR (name, scm_class_object);
+
+ /* <top> <object> and <class> were partially initialized. Correct them here */
+ SCM_SET_SLOT (scm_class_object, scm_si_direct_subclasses, scm_list_1 (scm_class_class));
+
+ SCM_SET_SLOT (scm_class_class, scm_si_direct_supers, scm_list_1 (scm_class_object));
+ SCM_SET_SLOT (scm_class_class, scm_si_cpl, scm_list_3 (scm_class_class, scm_class_object, scm_class_top));
+}
+
+/******************************************************************************/
+
+SCM_DEFINE (scm_instance_p, "instance?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is an instance.")
+#define FUNC_NAME s_scm_instance_p
+{
+ return scm_from_bool (SCM_INSTANCEP (obj));
+}
+#undef FUNC_NAME
+
+
+/******************************************************************************
+ *
+ * Meta object accessors
+ *
+ ******************************************************************************/
+SCM_DEFINE (scm_class_name, "class-name", 1, 0, 0,
+ (SCM obj),
+ "Return the class name of @var{obj}.")
+#define FUNC_NAME s_scm_class_name
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref (obj, sym_name);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_direct_supers, "class-direct-supers", 1, 0, 0,
+ (SCM obj),
+ "Return the direct superclasses of the class @var{obj}.")
+#define FUNC_NAME s_scm_class_direct_supers
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref (obj, sym_direct_supers);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_direct_slots, "class-direct-slots", 1, 0, 0,
+ (SCM obj),
+ "Return the direct slots of the class @var{obj}.")
+#define FUNC_NAME s_scm_class_direct_slots
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref (obj, sym_direct_slots);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_direct_subclasses, "class-direct-subclasses", 1, 0, 0,
+ (SCM obj),
+ "Return the direct subclasses of the class @var{obj}.")
+#define FUNC_NAME s_scm_class_direct_subclasses
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref(obj, sym_direct_subclasses);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_direct_methods, "class-direct-methods", 1, 0, 0,
+ (SCM obj),
+ "Return the direct methods of the class @var{obj}")
+#define FUNC_NAME s_scm_class_direct_methods
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref (obj, sym_direct_methods);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_precedence_list, "class-precedence-list", 1, 0, 0,
+ (SCM obj),
+ "Return the class precedence list of the class @var{obj}.")
+#define FUNC_NAME s_scm_class_precedence_list
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref (obj, sym_cpl);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_slots, "class-slots", 1, 0, 0,
+ (SCM obj),
+ "Return the slot list of the class @var{obj}.")
+#define FUNC_NAME s_scm_class_slots
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref (obj, sym_slots);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_class_environment, "class-environment", 1, 0, 0,
+ (SCM obj),
+ "Return the environment of the class @var{obj}.")
+#define FUNC_NAME s_scm_class_environment
+{
+ SCM_VALIDATE_CLASS (1, obj);
+ return scm_slot_ref(obj, sym_environment);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_generic_function_name, "generic-function-name", 1, 0, 0,
+ (SCM obj),
+ "Return the name of the generic function @var{obj}.")
+#define FUNC_NAME s_scm_generic_function_name
+{
+ SCM_VALIDATE_GENERIC (1, obj);
+ return scm_procedure_property (obj, scm_sym_name);
+}
+#undef FUNC_NAME
+
+SCM_SYMBOL (sym_methods, "methods");
+SCM_SYMBOL (sym_extended_by, "extended-by");
+SCM_SYMBOL (sym_extends, "extends");
+
+static
+SCM fold_downward_gf_methods (SCM method_lists, SCM gf)
+{
+ SCM gfs = scm_slot_ref (gf, sym_extended_by);
+ method_lists = scm_cons (scm_slot_ref (gf, sym_methods), method_lists);
+ while (!scm_is_null (gfs))
+ {
+ method_lists = fold_downward_gf_methods (method_lists, SCM_CAR (gfs));
+ gfs = SCM_CDR (gfs);
+ }
+ return method_lists;
+}
+
+static
+SCM fold_upward_gf_methods (SCM method_lists, SCM gf)
+{
+ if (SCM_IS_A_P (gf, scm_class_extended_generic))
+ {
+ SCM gfs = scm_slot_ref (gf, sym_extends);
+ while (!scm_is_null (gfs))
+ {
+ SCM methods = scm_slot_ref (SCM_CAR (gfs), sym_methods);
+ method_lists = fold_upward_gf_methods (scm_cons (methods,
+ method_lists),
+ SCM_CAR (gfs));
+ gfs = SCM_CDR (gfs);
+ }
+ }
+ return method_lists;
+}
+
+SCM_DEFINE (scm_generic_function_methods, "generic-function-methods", 1, 0, 0,
+ (SCM obj),
+ "Return the methods of the generic function @var{obj}.")
+#define FUNC_NAME s_scm_generic_function_methods
+{
+ SCM methods;
+ SCM_VALIDATE_GENERIC (1, obj);
+ methods = fold_upward_gf_methods (SCM_EOL, obj);
+ methods = fold_downward_gf_methods (methods, obj);
+ return scm_append (methods);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_method_generic_function, "method-generic-function", 1, 0, 0,
+ (SCM obj),
+ "Return the generic function for the method @var{obj}.")
+#define FUNC_NAME s_scm_method_generic_function
+{
+ SCM_VALIDATE_METHOD (1, obj);
+ return scm_slot_ref (obj, scm_from_locale_symbol ("generic-function"));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_method_specializers, "method-specializers", 1, 0, 0,
+ (SCM obj),
+ "Return specializers of the method @var{obj}.")
+#define FUNC_NAME s_scm_method_specializers
+{
+ SCM_VALIDATE_METHOD (1, obj);
+ return scm_slot_ref (obj, scm_from_locale_symbol ("specializers"));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_method_procedure, "method-procedure", 1, 0, 0,
+ (SCM obj),
+ "Return the procedure of the method @var{obj}.")
+#define FUNC_NAME s_scm_method_procedure
+{
+ SCM_VALIDATE_METHOD (1, obj);
+ return scm_slot_ref (obj, sym_procedure);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_accessor_method_slot_definition, "accessor-method-slot-definition", 1, 0, 0,
+ (SCM obj),
+ "Return the slot definition of the accessor @var{obj}.")
+#define FUNC_NAME s_scm_accessor_method_slot_definition
+{
+ SCM_VALIDATE_ACCESSOR (1, obj);
+ return scm_slot_ref (obj, scm_from_locale_symbol ("slot-definition"));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_tag_body, "%tag-body", 1, 0, 0,
+ (SCM body),
+ "Internal GOOPS magic---don't use this function!")
+#define FUNC_NAME s_scm_sys_tag_body
+{
+ return scm_cons (SCM_IM_LAMBDA, body);
+}
+#undef FUNC_NAME
+
+/******************************************************************************
+ *
+ * S l o t a c c e s s
+ *
+ ******************************************************************************/
+
+SCM_DEFINE (scm_make_unbound, "make-unbound", 0, 0, 0,
+ (),
+ "Return the unbound value.")
+#define FUNC_NAME s_scm_make_unbound
+{
+ return SCM_GOOPS_UNBOUND;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_unbound_p, "unbound?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is unbound.")
+#define FUNC_NAME s_scm_unbound_p
+{
+ return SCM_GOOPS_UNBOUNDP (obj) ? SCM_BOOL_T : SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_assert_bound, "assert-bound", 2, 0, 0,
+ (SCM value, SCM obj),
+ "Return @var{value} if it is bound, and invoke the\n"
+ "@var{slot-unbound} method of @var{obj} if it is not.")
+#define FUNC_NAME s_scm_assert_bound
+{
+ if (SCM_GOOPS_UNBOUNDP (value))
+ return CALL_GF1 ("slot-unbound", obj);
+ return value;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_at_assert_bound_ref, "@assert-bound-ref", 2, 0, 0,
+ (SCM obj, SCM index),
+ "Like @code{assert-bound}, but use @var{index} for accessing\n"
+ "the value from @var{obj}.")
+#define FUNC_NAME s_scm_at_assert_bound_ref
+{
+ SCM value = SCM_SLOT (obj, scm_to_int (index));
+ if (SCM_GOOPS_UNBOUNDP (value))
+ return CALL_GF1 ("slot-unbound", obj);
+ return value;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_fast_slot_ref, "%fast-slot-ref", 2, 0, 0,
+ (SCM obj, SCM index),
+ "Return the slot value with index @var{index} from @var{obj}.")
+#define FUNC_NAME s_scm_sys_fast_slot_ref
+{
+ unsigned long int i;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ i = scm_to_unsigned_integer (index, 0,
+ SCM_I_INUM (SCM_SLOT (SCM_CLASS_OF (obj),
+ scm_si_nfields))
+ - 1);
+ return SCM_SLOT (obj, i);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_fast_slot_set_x, "%fast-slot-set!", 3, 0, 0,
+ (SCM obj, SCM index, SCM value),
+ "Set the slot with index @var{index} in @var{obj} to\n"
+ "@var{value}.")
+#define FUNC_NAME s_scm_sys_fast_slot_set_x
+{
+ unsigned long int i;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ i = scm_to_unsigned_integer (index, 0,
+ SCM_I_INUM (SCM_SLOT (SCM_CLASS_OF (obj),
+ scm_si_nfields))
+ - 1);
+
+ SCM_SET_SLOT (obj, i, value);
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+
+SCM_SYNTAX (s_atslot_ref, "@slot-ref", scm_i_makbimacro, scm_m_atslot_ref);
+SCM_SYNTAX (s_atslot_set_x, "@slot-set!", scm_i_makbimacro, scm_m_atslot_set_x);
+
+
+/** Utilities **/
+
+/* In the future, this function will return the effective slot
+ * definition associated with SLOT_NAME. Now it just returns some of
+ * the information which will be stored in the effective slot
+ * definition.
+ */
+
+static SCM
+slot_definition_using_name (SCM class, SCM slot_name)
+{
+ register SCM slots = SCM_SLOT (class, scm_si_getters_n_setters);
+ for (; !scm_is_null (slots); slots = SCM_CDR (slots))
+ if (SCM_CAAR (slots) == slot_name)
+ return SCM_CAR (slots);
+ return SCM_BOOL_F;
+}
+
+static SCM
+get_slot_value (SCM class SCM_UNUSED, SCM obj, SCM slotdef)
+#define FUNC_NAME "%get-slot-value"
+{
+ SCM access = SCM_CDDR (slotdef);
+ /* Two cases here:
+ * - access is an integer (the offset of this slot in the slots vector)
+ * - otherwise (car access) is the getter function to apply
+ *
+ * Instances have never more than SCM_MOST_POSITIVE_FIXNUM slots, so
+ * we can just assume fixnums here.
+ */
+ if (SCM_I_INUMP (access))
+ /* Don't poke at the slots directly, because scm_struct_ref handles the
+ access bits for us. */
+ return scm_struct_ref (obj, access);
+ else
+ {
+ /* We must evaluate (apply (car access) (list obj))
+ * where (car access) is known to be a closure of arity 1 */
+ register SCM code, env;
+
+ code = SCM_CAR (access);
+ if (!SCM_CLOSUREP (code))
+ return SCM_SUBRF (code) (obj);
+ env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (code),
+ scm_list_1 (obj),
+ SCM_ENV (code));
+ /* Evaluate the closure body */
+ return scm_eval_body (SCM_CLOSURE_BODY (code), env);
+ }
+}
+#undef FUNC_NAME
+
+static SCM
+get_slot_value_using_name (SCM class, SCM obj, SCM slot_name)
+{
+ SCM slotdef = slot_definition_using_name (class, slot_name);
+ if (scm_is_true (slotdef))
+ return get_slot_value (class, obj, slotdef);
+ else
+ return CALL_GF3 ("slot-missing", class, obj, slot_name);
+}
+
+static SCM
+set_slot_value (SCM class SCM_UNUSED, SCM obj, SCM slotdef, SCM value)
+#define FUNC_NAME "%set-slot-value"
+{
+ SCM access = SCM_CDDR (slotdef);
+ /* Two cases here:
+ * - access is an integer (the offset of this slot in the slots vector)
+ * - otherwise (cadr access) is the setter function to apply
+ *
+ * Instances have never more than SCM_MOST_POSITIVE_FIXNUM slots, so
+ * we can just assume fixnums here.
+ */
+ if (SCM_I_INUMP (access))
+ /* obey permissions bits via going through struct-set! */
+ scm_struct_set_x (obj, access, value);
+ else
+ {
+ /* We must evaluate (apply (cadr l) (list obj value))
+ * where (cadr l) is known to be a closure of arity 2 */
+ register SCM code, env;
+
+ code = SCM_CADR (access);
+ if (!SCM_CLOSUREP (code))
+ SCM_SUBRF (code) (obj, value);
+ else
+ {
+ env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (code),
+ scm_list_2 (obj, value),
+ SCM_ENV (code));
+ /* Evaluate the closure body */
+ scm_eval_body (SCM_CLOSURE_BODY (code), env);
+ }
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+static SCM
+set_slot_value_using_name (SCM class, SCM obj, SCM slot_name, SCM value)
+{
+ SCM slotdef = slot_definition_using_name (class, slot_name);
+ if (scm_is_true (slotdef))
+ return set_slot_value (class, obj, slotdef, value);
+ else
+ return CALL_GF4 ("slot-missing", class, obj, slot_name, value);
+}
+
+static SCM
+test_slot_existence (SCM class SCM_UNUSED, SCM obj, SCM slot_name)
+{
+ register SCM l;
+
+ for (l = SCM_ACCESSORS_OF (obj); !scm_is_null (l); l = SCM_CDR (l))
+ if (scm_is_eq (SCM_CAAR (l), slot_name))
+ return SCM_BOOL_T;
+
+ return SCM_BOOL_F;
+}
+
+ /* ======================================== */
+
+SCM_DEFINE (scm_slot_ref_using_class, "slot-ref-using-class", 3, 0, 0,
+ (SCM class, SCM obj, SCM slot_name),
+ "")
+#define FUNC_NAME s_scm_slot_ref_using_class
+{
+ SCM res;
+
+ SCM_VALIDATE_CLASS (1, class);
+ SCM_VALIDATE_INSTANCE (2, obj);
+ SCM_VALIDATE_SYMBOL (3, slot_name);
+
+ res = get_slot_value_using_name (class, obj, slot_name);
+ if (SCM_GOOPS_UNBOUNDP (res))
+ return CALL_GF3 ("slot-unbound", class, obj, slot_name);
+ return res;
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_slot_set_using_class_x, "slot-set-using-class!", 4, 0, 0,
+ (SCM class, SCM obj, SCM slot_name, SCM value),
+ "")
+#define FUNC_NAME s_scm_slot_set_using_class_x
+{
+ SCM_VALIDATE_CLASS (1, class);
+ SCM_VALIDATE_INSTANCE (2, obj);
+ SCM_VALIDATE_SYMBOL (3, slot_name);
+
+ return set_slot_value_using_name (class, obj, slot_name, value);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_slot_bound_using_class_p, "slot-bound-using-class?", 3, 0, 0,
+ (SCM class, SCM obj, SCM slot_name),
+ "")
+#define FUNC_NAME s_scm_slot_bound_using_class_p
+{
+ SCM_VALIDATE_CLASS (1, class);
+ SCM_VALIDATE_INSTANCE (2, obj);
+ SCM_VALIDATE_SYMBOL (3, slot_name);
+
+ return (SCM_GOOPS_UNBOUNDP (get_slot_value_using_name (class, obj, slot_name))
+ ? SCM_BOOL_F
+ : SCM_BOOL_T);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_slot_exists_using_class_p, "slot-exists-using-class?", 3, 0, 0,
+ (SCM class, SCM obj, SCM slot_name),
+ "")
+#define FUNC_NAME s_scm_slot_exists_using_class_p
+{
+ SCM_VALIDATE_CLASS (1, class);
+ SCM_VALIDATE_INSTANCE (2, obj);
+ SCM_VALIDATE_SYMBOL (3, slot_name);
+ return test_slot_existence (class, obj, slot_name);
+}
+#undef FUNC_NAME
+
+
+ /* ======================================== */
+
+SCM_DEFINE (scm_slot_ref, "slot-ref", 2, 0, 0,
+ (SCM obj, SCM slot_name),
+ "Return the value from @var{obj}'s slot with the name\n"
+ "@var{slot_name}.")
+#define FUNC_NAME s_scm_slot_ref
+{
+ SCM res, class;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ TEST_CHANGE_CLASS (obj, class);
+
+ res = get_slot_value_using_name (class, obj, slot_name);
+ if (SCM_GOOPS_UNBOUNDP (res))
+ return CALL_GF3 ("slot-unbound", class, obj, slot_name);
+ return res;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_slot_set_x, "slot-set!", 3, 0, 0,
+ (SCM obj, SCM slot_name, SCM value),
+ "Set the slot named @var{slot_name} of @var{obj} to @var{value}.")
+#define FUNC_NAME s_scm_slot_set_x
+{
+ SCM class;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ TEST_CHANGE_CLASS(obj, class);
+
+ return set_slot_value_using_name (class, obj, slot_name, value);
+}
+#undef FUNC_NAME
+
+const char *scm_s_slot_set_x = s_scm_slot_set_x;
+
+SCM_DEFINE (scm_slot_bound_p, "slot-bound?", 2, 0, 0,
+ (SCM obj, SCM slot_name),
+ "Return @code{#t} if the slot named @var{slot_name} of @var{obj}\n"
+ "is bound.")
+#define FUNC_NAME s_scm_slot_bound_p
+{
+ SCM class;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ TEST_CHANGE_CLASS(obj, class);
+
+ return (SCM_GOOPS_UNBOUNDP (get_slot_value_using_name (class,
+ obj,
+ slot_name))
+ ? SCM_BOOL_F
+ : SCM_BOOL_T);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_slot_exists_p, "slot-exists?", 2, 0, 0,
+ (SCM obj, SCM slot_name),
+ "Return @code{#t} if @var{obj} has a slot named @var{slot_name}.")
+#define FUNC_NAME s_scm_slot_exists_p
+{
+ SCM class;
+
+ SCM_VALIDATE_INSTANCE (1, obj);
+ SCM_VALIDATE_SYMBOL (2, slot_name);
+ TEST_CHANGE_CLASS (obj, class);
+
+ return test_slot_existence (class, obj, slot_name);
+}
+#undef FUNC_NAME
+
+
+/******************************************************************************
+ *
+ * %allocate-instance (the low level instance allocation primitive)
+ *
+ ******************************************************************************/
+
+static void clear_method_cache (SCM);
+
+static SCM
+wrap_init (SCM class, SCM *m, long n)
+{
+ long i;
+ scm_t_bits slayout = SCM_STRUCT_DATA (class)[scm_vtable_index_layout];
+ const char *layout = scm_i_symbol_chars (SCM_PACK (slayout));
+
+ /* Set all SCM-holding slots to unbound */
+ for (i = 0; i < n; i++)
+ if (layout[i*2] == 'p')
+ m[i] = SCM_GOOPS_UNBOUND;
+ else
+ m[i] = 0;
+
+ return scm_double_cell ((((scm_t_bits) SCM_STRUCT_DATA (class))
+ | scm_tc3_struct),
+ (scm_t_bits) m, 0, 0);
+}
+
+SCM_DEFINE (scm_sys_allocate_instance, "%allocate-instance", 2, 0, 0,
+ (SCM class, SCM initargs),
+ "Create a new instance of class @var{class} and initialize it\n"
+ "from the arguments @var{initargs}.")
+#define FUNC_NAME s_scm_sys_allocate_instance
+{
+ SCM *m;
+ long n;
+
+ SCM_VALIDATE_CLASS (1, class);
+
+ /* Most instances */
+ if (SCM_CLASS_FLAGS (class) & SCM_STRUCTF_LIGHT)
+ {
+ n = SCM_I_INUM (SCM_SLOT (class, scm_si_nfields));
+ m = (SCM *) scm_gc_malloc (n * sizeof (SCM), "struct");
+ return wrap_init (class, m, n);
+ }
+
+ /* Foreign objects */
+ if (SCM_CLASS_FLAGS (class) & SCM_CLASSF_FOREIGN)
+ return scm_make_foreign_object (class, initargs);
+
+ n = SCM_I_INUM (SCM_SLOT (class, scm_si_nfields));
+
+ /* Entities */
+ if (SCM_CLASS_FLAGS (class) & SCM_CLASSF_ENTITY)
+ {
+ m = (SCM *) scm_alloc_struct (n, scm_struct_entity_n_extra_words,
+ "entity struct");
+ m[scm_struct_i_setter] = SCM_BOOL_F;
+ m[scm_struct_i_procedure] = SCM_BOOL_F;
+ /* Generic functions */
+ if (SCM_CLASS_FLAGS (class) & SCM_CLASSF_PURE_GENERIC)
+ {
+ SCM gf = wrap_init (class, m, n);
+ clear_method_cache (gf);
+ return gf;
+ }
+ else
+ return wrap_init (class, m, n);
+ }
+
+ /* Class objects */
+ if (SCM_CLASS_FLAGS (class) & SCM_CLASSF_METACLASS)
+ {
+ long i;
+
+ /* allocate class object */
+ SCM z = scm_make_struct (class, SCM_INUM0, SCM_EOL);
+
+ SCM_SET_SLOT (z, scm_si_print, SCM_GOOPS_UNBOUND);
+ for (i = scm_si_goops_fields; i < n; i++)
+ SCM_SET_SLOT (z, i, SCM_GOOPS_UNBOUND);
+
+ if (SCM_SUBCLASSP (class, scm_class_entity_class))
+ SCM_SET_CLASS_FLAGS (z, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
+ else if (SCM_SUBCLASSP (class, scm_class_operator_class))
+ SCM_SET_CLASS_FLAGS (z, SCM_CLASSF_OPERATOR);
+
+ return z;
+ }
+
+ /* Non-light instances */
+ {
+ m = (SCM *) scm_alloc_struct (n, scm_struct_n_extra_words, "heavy struct");
+ return wrap_init (class, m, n);
+ }
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_set_object_setter_x, "%set-object-setter!", 2, 0, 0,
+ (SCM obj, SCM setter),
+ "")
+#define FUNC_NAME s_scm_sys_set_object_setter_x
+{
+ SCM_ASSERT (SCM_STRUCTP (obj)
+ && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
+ || SCM_I_ENTITYP (obj)),
+ obj,
+ SCM_ARG1,
+ FUNC_NAME);
+ if (SCM_I_ENTITYP (obj))
+ SCM_SET_ENTITY_SETTER (obj, setter);
+ else
+ SCM_OPERATOR_CLASS (obj)->setter = setter;
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+/******************************************************************************
+ *
+ * %modify-instance (used by change-class to modify in place)
+ *
+ ******************************************************************************/
+
+SCM_DEFINE (scm_sys_modify_instance, "%modify-instance", 2, 0, 0,
+ (SCM old, SCM new),
+ "")
+#define FUNC_NAME s_scm_sys_modify_instance
+{
+ SCM_VALIDATE_INSTANCE (1, old);
+ SCM_VALIDATE_INSTANCE (2, new);
+
+ /* Exchange the data contained in old and new. We exchange rather than
+ * scratch the old value with new to be correct with GC.
+ * See "Class redefinition protocol above".
+ */
+ SCM_CRITICAL_SECTION_START;
+ {
+ SCM car = SCM_CAR (old);
+ SCM cdr = SCM_CDR (old);
+ SCM_SETCAR (old, SCM_CAR (new));
+ SCM_SETCDR (old, SCM_CDR (new));
+ SCM_SETCAR (new, car);
+ SCM_SETCDR (new, cdr);
+ }
+ SCM_CRITICAL_SECTION_END;
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_modify_class, "%modify-class", 2, 0, 0,
+ (SCM old, SCM new),
+ "")
+#define FUNC_NAME s_scm_sys_modify_class
+{
+ SCM_VALIDATE_CLASS (1, old);
+ SCM_VALIDATE_CLASS (2, new);
+
+ SCM_CRITICAL_SECTION_START;
+ {
+ SCM car = SCM_CAR (old);
+ SCM cdr = SCM_CDR (old);
+ SCM_SETCAR (old, SCM_CAR (new));
+ SCM_SETCDR (old, SCM_CDR (new));
+ SCM_STRUCT_DATA (old)[scm_vtable_index_vtable] = SCM_UNPACK (old);
+ SCM_SETCAR (new, car);
+ SCM_SETCDR (new, cdr);
+ SCM_STRUCT_DATA (new)[scm_vtable_index_vtable] = SCM_UNPACK (new);
+ }
+ SCM_CRITICAL_SECTION_END;
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_invalidate_class, "%invalidate-class", 1, 0, 0,
+ (SCM class),
+ "")
+#define FUNC_NAME s_scm_sys_invalidate_class
+{
+ SCM_VALIDATE_CLASS (1, class);
+ SCM_CLEAR_CLASS_FLAGS (class, SCM_CLASSF_GOOPS_VALID);
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+/* When instances change class, they finally get a new body, but
+ * before that, they go through purgatory in hell. Odd as it may
+ * seem, this data structure saves us from eternal suffering in
+ * infinite recursions.
+ */
+
+static scm_t_bits **hell;
+static long n_hell = 1; /* one place for the evil one himself */
+static long hell_size = 4;
+static SCM hell_mutex;
+
+static long
+burnin (SCM o)
+{
+ long i;
+ for (i = 1; i < n_hell; ++i)
+ if (SCM_STRUCT_DATA (o) == hell[i])
+ return i;
+ return 0;
+}
+
+static void
+go_to_hell (void *o)
+{
+ SCM obj = SCM_PACK ((scm_t_bits) o);
+ scm_lock_mutex (hell_mutex);
+ if (n_hell >= hell_size)
+ {
+ hell_size *= 2;
+ hell = scm_realloc (hell, hell_size * sizeof(*hell));
+ }
+ hell[n_hell++] = SCM_STRUCT_DATA (obj);
+ scm_unlock_mutex (hell_mutex);
+}
+
+static void
+go_to_heaven (void *o)
+{
+ scm_lock_mutex (hell_mutex);
+ hell[burnin (SCM_PACK ((scm_t_bits) o))] = hell[--n_hell];
+ scm_unlock_mutex (hell_mutex);
+}
+
+
+SCM_SYMBOL (scm_sym_change_class, "change-class");
+
+static SCM
+purgatory (void *args)
+{
+ return scm_apply_0 (GETVAR (scm_sym_change_class),
+ SCM_PACK ((scm_t_bits) args));
+}
+
+/* This function calls the generic function change-class for all
+ * instances which aren't currently undergoing class change.
+ */
+
+void
+scm_change_object_class (SCM obj, SCM old_class SCM_UNUSED, SCM new_class)
+{
+ if (!burnin (obj))
+ scm_internal_dynamic_wind (go_to_hell, purgatory, go_to_heaven,
+ (void *) SCM_UNPACK (scm_list_2 (obj, new_class)),
+ (void *) SCM_UNPACK (obj));
+}
+
+/******************************************************************************
+ *
+ * GGGG FFFFF
+ * G F
+ * G GG FFF
+ * G G F
+ * GGG E N E R I C F U N C T I O N S
+ *
+ * This implementation provides
+ * - generic functions (with class specializers)
+ * - multi-methods
+ * - next-method
+ * - a hard-coded MOP for standard gf, which can be overloaded for non-std gf
+ *
+ ******************************************************************************/
+
+SCM_KEYWORD (k_name, "name");
+
+SCM_SYMBOL (sym_no_method, "no-method");
+
+static SCM list_of_no_method;
+
+SCM_GLOBAL_SYMBOL (scm_sym_args, "args");
+
+
+SCM
+scm_make_method_cache (SCM gf)
+{
+ return scm_list_5 (SCM_IM_DISPATCH,
+ scm_sym_args,
+ scm_from_int (1),
+ scm_c_make_vector (SCM_INITIAL_MCACHE_SIZE,
+ list_of_no_method),
+ gf);
+}
+
+static void
+clear_method_cache (SCM gf)
+{
+ SCM cache = scm_make_method_cache (gf);
+ SCM_SET_ENTITY_PROCEDURE (gf, cache);
+ SCM_SET_SLOT (gf, scm_si_used_by, SCM_BOOL_F);
+}
+
+SCM_DEFINE (scm_sys_invalidate_method_cache_x, "%invalidate-method-cache!", 1, 0, 0,
+ (SCM gf),
+ "")
+#define FUNC_NAME s_scm_sys_invalidate_method_cache_x
+{
+ SCM used_by;
+ SCM_ASSERT (SCM_PUREGENERICP (gf), gf, SCM_ARG1, FUNC_NAME);
+ used_by = SCM_SLOT (gf, scm_si_used_by);
+ if (scm_is_true (used_by))
+ {
+ SCM methods = SCM_SLOT (gf, scm_si_methods);
+ for (; scm_is_pair (used_by); used_by = SCM_CDR (used_by))
+ scm_sys_invalidate_method_cache_x (SCM_CAR (used_by));
+ clear_method_cache (gf);
+ for (; scm_is_pair (methods); methods = SCM_CDR (methods))
+ SCM_SET_SLOT (SCM_CAR (methods), scm_si_code_table, SCM_EOL);
+ }
+ {
+ SCM n = SCM_SLOT (gf, scm_si_n_specialized);
+ /* The sign of n is a flag indicating rest args. */
+ SCM_SET_MCACHE_N_SPECIALIZED (SCM_ENTITY_PROCEDURE (gf), n);
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_generic_capability_p, "generic-capability?", 1, 0, 0,
+ (SCM proc),
+ "")
+#define FUNC_NAME s_scm_generic_capability_p
+{
+ SCM_ASSERT (scm_is_true (scm_procedure_p (proc)),
+ proc, SCM_ARG1, FUNC_NAME);
+ return (scm_subr_p (proc) && SCM_SUBR_GENERIC (proc)
+ ? SCM_BOOL_T
+ : SCM_BOOL_F);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_enable_primitive_generic_x, "enable-primitive-generic!", 0, 0, 1,
+ (SCM subrs),
+ "")
+#define FUNC_NAME s_scm_enable_primitive_generic_x
+{
+ SCM_VALIDATE_REST_ARGUMENT (subrs);
+ while (!scm_is_null (subrs))
+ {
+ SCM subr = SCM_CAR (subrs);
+ SCM_ASSERT (scm_subr_p (subr) && SCM_SUBR_GENERIC (subr),
+ subr, SCM_ARGn, FUNC_NAME);
+ *SCM_SUBR_GENERIC (subr)
+ = scm_make (scm_list_3 (scm_class_generic,
+ k_name,
+ SCM_SNAME (subr)));
+ subrs = SCM_CDR (subrs);
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_primitive_generic_generic, "primitive-generic-generic", 1, 0, 0,
+ (SCM subr),
+ "")
+#define FUNC_NAME s_scm_primitive_generic_generic
+{
+ if (scm_subr_p (subr) && SCM_SUBR_GENERIC (subr))
+ {
+ if (!*SCM_SUBR_GENERIC (subr))
+ scm_enable_primitive_generic_x (scm_list_1 (subr));
+ return *SCM_SUBR_GENERIC (subr);
+ }
+ SCM_WRONG_TYPE_ARG (SCM_ARG1, subr);
+}
+#undef FUNC_NAME
+
+typedef struct t_extension {
+ struct t_extension *next;
+ SCM extended;
+ SCM extension;
+} t_extension;
+
+static t_extension *extensions = 0;
+
+SCM_VARIABLE (scm_var_make_extended_generic, "make-extended-generic");
+
+void
+scm_c_extend_primitive_generic (SCM extended, SCM extension)
+{
+ if (goops_loaded_p)
+ {
+ SCM gf, gext;
+ if (!*SCM_SUBR_GENERIC (extended))
+ scm_enable_primitive_generic_x (scm_list_1 (extended));
+ gf = *SCM_SUBR_GENERIC (extended);
+ gext = scm_call_2 (SCM_VARIABLE_REF (scm_var_make_extended_generic),
+ gf,
+ SCM_SNAME (extension));
+ *SCM_SUBR_GENERIC (extension) = gext;
+ }
+ else
+ {
+ t_extension *e = scm_malloc (sizeof (t_extension));
+ t_extension **loc = &extensions;
+ /* Make sure that extensions are placed before their own
+ * extensions in the extensions list. O(N^2) algorithm, but
+ * extensions of primitive generics are rare.
+ */
+ while (*loc && extension != (*loc)->extended)
+ loc = &(*loc)->next;
+ e->next = *loc;
+ e->extended = extended;
+ e->extension = extension;
+ *loc = e;
+ }
+}
+
+static void
+setup_extended_primitive_generics ()
+{
+ while (extensions)
+ {
+ t_extension *e = extensions;
+ scm_c_extend_primitive_generic (e->extended, e->extension);
+ extensions = e->next;
+ free (e);
+ }
+}
+
+/******************************************************************************
+ *
+ * Protocol for calling a generic fumction
+ * This protocol is roughly equivalent to (parameter are a little bit different
+ * for efficiency reasons):
+ *
+ * + apply-generic (gf args)
+ * + compute-applicable-methods (gf args ...)
+ * + sort-applicable-methods (methods args)
+ * + apply-methods (gf methods args)
+ *
+ * apply-methods calls make-next-method to build the "continuation" of a a
+ * method. Applying a next-method will call apply-next-method which in
+ * turn will call apply again to call effectively the following method.
+ *
+ ******************************************************************************/
+
+static int
+applicablep (SCM actual, SCM formal)
+{
+ /* We already know that the cpl is well formed. */
+ return scm_is_true (scm_c_memq (formal, SCM_SLOT (actual, scm_si_cpl)));
+}
+
+static int
+more_specificp (SCM m1, SCM m2, SCM const *targs)
+{
+ register SCM s1, s2;
+ register long i;
+ /*
+ * Note:
+ * m1 and m2 can have != length (i.e. one can be one element longer than the
+ * other when we have a dotted parameter list). For instance, with the call
+ * (M 1)
+ * with
+ * (define-method M (a . l) ....)
+ * (define-method M (a) ....)
+ *
+ * we consider that the second method is more specific.
+ *
+ * BTW, targs is an array of types. We don't need it's size since
+ * we already know that m1 and m2 are applicable (no risk to go past
+ * the end of this array).
+ *
+ */
+ for (i=0, s1=SPEC_OF(m1), s2=SPEC_OF(m2); ; i++, s1=SCM_CDR(s1), s2=SCM_CDR(s2)) {
+ if (scm_is_null(s1)) return 1;
+ if (scm_is_null(s2)) return 0;
+ if (SCM_CAR(s1) != SCM_CAR(s2)) {
+ register SCM l, cs1 = SCM_CAR(s1), cs2 = SCM_CAR(s2);
+
+ for (l = SCM_SLOT (targs[i], scm_si_cpl); ; l = SCM_CDR(l)) {
+ if (cs1 == SCM_CAR(l))
+ return 1;
+ if (cs2 == SCM_CAR(l))
+ return 0;
+ }
+ return 0;/* should not occur! */
+ }
+ }
+ return 0; /* should not occur! */
+}
+
+#define BUFFSIZE 32 /* big enough for most uses */
+
+static SCM
+scm_i_vector2list (SCM l, long len)
+{
+ long j;
+ SCM z = scm_c_make_vector (len, SCM_UNDEFINED);
+
+ for (j = 0; j < len; j++, l = SCM_CDR (l)) {
+ SCM_SIMPLE_VECTOR_SET (z, j, SCM_CAR (l));
+ }
+ return z;
+}
+
+static SCM
+sort_applicable_methods (SCM method_list, long size, SCM const *targs)
+{
+ long i, j, incr;
+ SCM *v, vector = SCM_EOL;
+ SCM buffer[BUFFSIZE];
+ SCM save = method_list;
+ scm_t_array_handle handle;
+
+ /* For reasonably sized method_lists we can try to avoid all the
+ * consing and reorder the list in place...
+ * This idea is due to David McClain <Dave_McClain@msn.com>
+ */
+ if (size <= BUFFSIZE)
+ {
+ for (i = 0; i < size; i++)
+ {
+ buffer[i] = SCM_CAR (method_list);
+ method_list = SCM_CDR (method_list);
+ }
+ v = buffer;
+ }
+ else
+ {
+ /* Too many elements in method_list to keep everything locally */
+ vector = scm_i_vector2list (save, size);
+ v = scm_vector_writable_elements (vector, &handle, NULL, NULL);
+ }
+
+ /* Use a simple shell sort since it is generally faster than qsort on
+ * small vectors (which is probably mostly the case when we have to
+ * sort a list of applicable methods).
+ */
+ for (incr = size / 2; incr; incr /= 2)
+ {
+ for (i = incr; i < size; i++)
+ {
+ for (j = i - incr; j >= 0; j -= incr)
+ {
+ if (more_specificp (v[j], v[j+incr], targs))
+ break;
+ else
+ {
+ SCM tmp = v[j + incr];
+ v[j + incr] = v[j];
+ v[j] = tmp;
+ }
+ }
+ }
+ }
+
+ if (size <= BUFFSIZE)
+ {
+ /* We did it in locally, so restore the original list (reordered) in-place */
+ for (i = 0, method_list = save; i < size; i++, v++)
+ {
+ SCM_SETCAR (method_list, *v);
+ method_list = SCM_CDR (method_list);
+ }
+ return save;
+ }
+
+ /* If we are here, that's that we did it the hard way... */
+ scm_array_handle_release (&handle);
+ return scm_vector_to_list (vector);
+}
+
+SCM
+scm_compute_applicable_methods (SCM gf, SCM args, long len, int find_method_p)
+{
+ register long i;
+ long count = 0;
+ SCM l, fl, applicable = SCM_EOL;
+ SCM save = args;
+ SCM buffer[BUFFSIZE];
+ SCM const *types;
+ SCM *p;
+ SCM tmp = SCM_EOL;
+ scm_t_array_handle handle;
+
+ /* Build the list of arguments types */
+ if (len >= BUFFSIZE)
+ {
+ tmp = scm_c_make_vector (len, SCM_UNDEFINED);
+ types = p = scm_vector_writable_elements (tmp, &handle, NULL, NULL);
+
+ /*
+ note that we don't have to work to reset the generation
+ count. TMP is a new vector anyway, and it is found
+ conservatively.
+ */
+ }
+ else
+ types = p = buffer;
+
+ for ( ; !scm_is_null (args); args = SCM_CDR (args))
+ *p++ = scm_class_of (SCM_CAR (args));
+
+ /* Build a list of all applicable methods */
+ for (l = scm_generic_function_methods (gf); !scm_is_null (l); l = SCM_CDR (l))
+ {
+ fl = SPEC_OF (SCM_CAR (l));
+ /* Only accept accessors which match exactly in first arg. */
+ if (SCM_ACCESSORP (SCM_CAR (l))
+ && (scm_is_null (fl) || types[0] != SCM_CAR (fl)))
+ continue;
+ for (i = 0; ; i++, fl = SCM_CDR (fl))
+ {
+ if (SCM_INSTANCEP (fl)
+ /* We have a dotted argument list */
+ || (i >= len && scm_is_null (fl)))
+ { /* both list exhausted */
+ applicable = scm_cons (SCM_CAR (l), applicable);
+ count += 1;
+ break;
+ }
+ if (i >= len
+ || scm_is_null (fl)
+ || !applicablep (types[i], SCM_CAR (fl)))
+ break;
+ }
+ }
+
+ if (len >= BUFFSIZE)
+ scm_array_handle_release (&handle);
+
+ if (count == 0)
+ {
+ if (find_method_p)
+ return SCM_BOOL_F;
+ CALL_GF2 ("no-applicable-method", gf, save);
+ /* if we are here, it's because no-applicable-method hasn't signaled an error */
+ return SCM_BOOL_F;
+ }
+
+ return (count == 1
+ ? applicable
+ : sort_applicable_methods (applicable, count, types));
+}
+
+#if 0
+SCM_PROC (s_sys_compute_applicable_methods, "%compute-applicable-methods", 2, 0, 0, scm_sys_compute_applicable_methods);
+#endif
+
+static const char s_sys_compute_applicable_methods[] = "%compute-applicable-methods";
+
+SCM
+scm_sys_compute_applicable_methods (SCM gf, SCM args)
+#define FUNC_NAME s_sys_compute_applicable_methods
+{
+ long n;
+ SCM_VALIDATE_GENERIC (1, gf);
+ n = scm_ilength (args);
+ SCM_ASSERT (n >= 0, args, SCM_ARG2, FUNC_NAME);
+ return scm_compute_applicable_methods (gf, args, n, 1);
+}
+#undef FUNC_NAME
+
+SCM_SYMBOL (sym_compute_applicable_methods, "compute-applicable-methods");
+SCM_VARIABLE_INIT (var_compute_applicable_methods, "compute-applicable-methods", scm_c_define_gsubr (s_sys_compute_applicable_methods, 2, 0, 0, scm_sys_compute_applicable_methods));
+
+static void
+lock_cache_mutex (void *m)
+{
+ SCM mutex = SCM_PACK ((scm_t_bits) m);
+ scm_lock_mutex (mutex);
+}
+
+static void
+unlock_cache_mutex (void *m)
+{
+ SCM mutex = SCM_PACK ((scm_t_bits) m);
+ scm_unlock_mutex (mutex);
+}
+
+static SCM
+call_memoize_method (void *a)
+{
+ SCM args = SCM_PACK ((scm_t_bits) a);
+ SCM gf = SCM_CAR (args);
+ SCM x = SCM_CADR (args);
+ /* First check if another thread has inserted a method between
+ * the cache miss and locking the mutex.
+ */
+ SCM cmethod = scm_mcache_lookup_cmethod (x, SCM_CDDR (args));
+ if (scm_is_true (cmethod))
+ return cmethod;
+ /*fixme* Use scm_apply */
+ return CALL_GF3 ("memoize-method!", gf, SCM_CDDR (args), x);
+}
+
+SCM
+scm_memoize_method (SCM x, SCM args)
+{
+ SCM gf = SCM_CAR (scm_last_pair (x));
+ return scm_internal_dynamic_wind (
+ lock_cache_mutex,
+ call_memoize_method,
+ unlock_cache_mutex,
+ (void *) SCM_UNPACK (scm_cons2 (gf, x, args)),
+ (void *) SCM_UNPACK (SCM_SLOT (gf, scm_si_cache_mutex)));
+}
+
+/******************************************************************************
+ *
+ * A simple make (which will be redefined later in Scheme)
+ * This version handles only creation of gf, methods and classes (no instances)
+ *
+ * Since this code will disappear when Goops will be fully booted,
+ * no precaution is taken to be efficient.
+ *
+ ******************************************************************************/
+
+SCM_KEYWORD (k_setter, "setter");
+SCM_KEYWORD (k_specializers, "specializers");
+SCM_KEYWORD (k_procedure, "procedure");
+SCM_KEYWORD (k_dsupers, "dsupers");
+SCM_KEYWORD (k_slots, "slots");
+SCM_KEYWORD (k_gf, "generic-function");
+
+SCM_DEFINE (scm_make, "make", 0, 0, 1,
+ (SCM args),
+ "Make a new object. @var{args} must contain the class and\n"
+ "all necessary initialization information.")
+#define FUNC_NAME s_scm_make
+{
+ SCM class, z;
+ long len = scm_ilength (args);
+
+ if (len <= 0 || (len & 1) == 0)
+ SCM_WRONG_NUM_ARGS ();
+
+ class = SCM_CAR(args);
+ args = SCM_CDR(args);
+
+ if (class == scm_class_generic || class == scm_class_accessor)
+ {
+ z = scm_make_struct (class, SCM_INUM0,
+ scm_list_5 (SCM_EOL,
+ SCM_INUM0,
+ SCM_BOOL_F,
+ scm_make_mutex (),
+ SCM_EOL));
+ scm_set_procedure_property_x (z, scm_sym_name,
+ scm_get_keyword (k_name,
+ args,
+ SCM_BOOL_F));
+ clear_method_cache (z);
+ if (class == scm_class_accessor)
+ {
+ SCM setter = scm_get_keyword (k_setter, args, SCM_BOOL_F);
+ if (scm_is_true (setter))
+ scm_sys_set_object_setter_x (z, setter);
+ }
+ }
+ else
+ {
+ z = scm_sys_allocate_instance (class, args);
+
+ if (class == scm_class_method
+ || class == scm_class_simple_method
+ || class == scm_class_accessor_method)
+ {
+ SCM_SET_SLOT (z, scm_si_generic_function,
+ scm_i_get_keyword (k_gf,
+ args,
+ len - 1,
+ SCM_BOOL_F,
+ FUNC_NAME));
+ SCM_SET_SLOT (z, scm_si_specializers,
+ scm_i_get_keyword (k_specializers,
+ args,
+ len - 1,
+ SCM_EOL,
+ FUNC_NAME));
+ SCM_SET_SLOT (z, scm_si_procedure,
+ scm_i_get_keyword (k_procedure,
+ args,
+ len - 1,
+ SCM_EOL,
+ FUNC_NAME));
+ SCM_SET_SLOT (z, scm_si_code_table, SCM_EOL);
+ }
+ else
+ {
+ /* In all the others case, make a new class .... No instance here */
+ SCM_SET_SLOT (z, scm_si_name,
+ scm_i_get_keyword (k_name,
+ args,
+ len - 1,
+ scm_from_locale_symbol ("???"),
+ FUNC_NAME));
+ SCM_SET_SLOT (z, scm_si_direct_supers,
+ scm_i_get_keyword (k_dsupers,
+ args,
+ len - 1,
+ SCM_EOL,
+ FUNC_NAME));
+ SCM_SET_SLOT (z, scm_si_direct_slots,
+ scm_i_get_keyword (k_slots,
+ args,
+ len - 1,
+ SCM_EOL,
+ FUNC_NAME));
+ }
+ }
+ return z;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_find_method, "find-method", 0, 0, 1,
+ (SCM l),
+ "")
+#define FUNC_NAME s_scm_find_method
+{
+ SCM gf;
+ long len = scm_ilength (l);
+
+ if (len == 0)
+ SCM_WRONG_NUM_ARGS ();
+
+ gf = SCM_CAR(l); l = SCM_CDR(l);
+ SCM_VALIDATE_GENERIC (1, gf);
+ if (scm_is_null (SCM_SLOT (gf, scm_si_methods)))
+ SCM_MISC_ERROR ("no methods for generic ~S", scm_list_1 (gf));
+
+ return scm_compute_applicable_methods (gf, l, len - 1, 1);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_sys_method_more_specific_p, "%method-more-specific?", 3, 0, 0,
+ (SCM m1, SCM m2, SCM targs),
+ "Return true if method @var{m1} is more specific than @var{m2} "
+ "given the argument types (classes) listed in @var{targs}.")
+#define FUNC_NAME s_scm_sys_method_more_specific_p
+{
+ SCM l, v, result;
+ SCM *v_elts;
+ long i, len, m1_specs, m2_specs;
+ scm_t_array_handle handle;
+
+ SCM_VALIDATE_METHOD (1, m1);
+ SCM_VALIDATE_METHOD (2, m2);
+
+ len = scm_ilength (targs);
+ m1_specs = scm_ilength (SPEC_OF (m1));
+ m2_specs = scm_ilength (SPEC_OF (m2));
+ SCM_ASSERT ((len >= m1_specs) || (len >= m2_specs),
+ targs, SCM_ARG3, FUNC_NAME);
+
+ /* Verify that all the arguments of TARGS are classes and place them
+ in a vector. */
+
+ v = scm_c_make_vector (len, SCM_EOL);
+ v_elts = scm_vector_writable_elements (v, &handle, NULL, NULL);
+
+ for (i = 0, l = targs;
+ i < len && scm_is_pair (l);
+ i++, l = SCM_CDR (l))
+ {
+ SCM_ASSERT (SCM_CLASSP (SCM_CAR (l)), targs, SCM_ARG3, FUNC_NAME);
+ v_elts[i] = SCM_CAR (l);
+ }
+ result = more_specificp (m1, m2, v_elts) ? SCM_BOOL_T: SCM_BOOL_F;
+
+ scm_array_handle_release (&handle);
+
+ return result;
+}
+#undef FUNC_NAME
+
+
+
+/******************************************************************************
+ *
+ * Initializations
+ *
+ ******************************************************************************/
+
+static void
+fix_cpl (SCM c, SCM before, SCM after)
+{
+ SCM cpl = SCM_SLOT (c, scm_si_cpl);
+ SCM ls = scm_c_memq (after, cpl);
+ SCM tail = scm_delq1_x (before, SCM_CDR (ls));
+ if (scm_is_false (ls))
+ /* if this condition occurs, fix_cpl should not be applied this way */
+ abort ();
+ SCM_SETCAR (ls, before);
+ SCM_SETCDR (ls, scm_cons (after, tail));
+ {
+ SCM dslots = SCM_SLOT (c, scm_si_direct_slots);
+ SCM slots = build_slots_list (maplist (dslots), cpl);
+ SCM g_n_s = compute_getters_n_setters (slots);
+ SCM_SET_SLOT (c, scm_si_slots, slots);
+ SCM_SET_SLOT (c, scm_si_getters_n_setters, g_n_s);
+ }
+}
+
+
+static void
+make_stdcls (SCM *var, char *name, SCM meta, SCM super, SCM slots)
+{
+ SCM tmp = scm_from_locale_symbol (name);
+
+ *var = scm_permanent_object (scm_basic_make_class (meta,
+ tmp,
+ scm_is_pair (super)
+ ? super
+ : scm_list_1 (super),
+ slots));
+ DEFVAR(tmp, *var);
+}
+
+
+SCM_KEYWORD (k_slot_definition, "slot-definition");
+
+static void
+create_standard_classes (void)
+{
+ SCM slots;
+ SCM method_slots = scm_list_4 (scm_from_locale_symbol ("generic-function"),
+ scm_from_locale_symbol ("specializers"),
+ sym_procedure,
+ scm_from_locale_symbol ("code-table"));
+ SCM amethod_slots = scm_list_1 (scm_list_3 (scm_from_locale_symbol ("slot-definition"),
+ k_init_keyword,
+ k_slot_definition));
+ SCM mutex_slot = scm_list_1 (scm_from_locale_symbol ("make-mutex"));
+ SCM mutex_closure = scm_i_eval_x (scm_list_3 (scm_sym_lambda,
+ SCM_EOL,
+ mutex_slot),
+ SCM_EOL);
+ SCM gf_slots = scm_list_5 (scm_from_locale_symbol ("methods"),
+ scm_list_3 (scm_from_locale_symbol ("n-specialized"),
+ k_init_value,
+ SCM_INUM0),
+ scm_list_3 (scm_from_locale_symbol ("used-by"),
+ k_init_value,
+ SCM_BOOL_F),
+ scm_list_3 (scm_from_locale_symbol ("cache-mutex"),
+ k_init_thunk,
+ mutex_closure),
+ scm_list_3 (scm_from_locale_symbol ("extended-by"),
+ k_init_value,
+ SCM_EOL));
+ SCM egf_slots = scm_list_1 (scm_list_3 (scm_from_locale_symbol ("extends"),
+ k_init_value,
+ SCM_EOL));
+ /* Foreign class slot classes */
+ make_stdcls (&scm_class_foreign_slot, "<foreign-slot>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_protected, "<protected-slot>",
+ scm_class_class, scm_class_foreign_slot, SCM_EOL);
+ make_stdcls (&scm_class_opaque, "<opaque-slot>",
+ scm_class_class, scm_class_foreign_slot, SCM_EOL);
+ make_stdcls (&scm_class_read_only, "<read-only-slot>",
+ scm_class_class, scm_class_foreign_slot, SCM_EOL);
+ make_stdcls (&scm_class_self, "<self-slot>",
+ scm_class_class,
+ scm_class_read_only,
+ SCM_EOL);
+ make_stdcls (&scm_class_protected_opaque, "<protected-opaque-slot>",
+ scm_class_class,
+ scm_list_2 (scm_class_protected, scm_class_opaque),
+ SCM_EOL);
+ make_stdcls (&scm_class_protected_read_only, "<protected-read-only-slot>",
+ scm_class_class,
+ scm_list_2 (scm_class_protected, scm_class_read_only),
+ SCM_EOL);
+ make_stdcls (&scm_class_scm, "<scm-slot>",
+ scm_class_class, scm_class_protected, SCM_EOL);
+ make_stdcls (&scm_class_int, "<int-slot>",
+ scm_class_class, scm_class_foreign_slot, SCM_EOL);
+ make_stdcls (&scm_class_float, "<float-slot>",
+ scm_class_class, scm_class_foreign_slot, SCM_EOL);
+ make_stdcls (&scm_class_double, "<double-slot>",
+ scm_class_class, scm_class_foreign_slot, SCM_EOL);
+
+ /* Continue initialization of class <class> */
+
+ slots = build_class_class_slots ();
+ SCM_SET_SLOT (scm_class_class, scm_si_direct_slots, slots);
+ SCM_SET_SLOT (scm_class_class, scm_si_slots, slots);
+ SCM_SET_SLOT (scm_class_class, scm_si_getters_n_setters,
+ compute_getters_n_setters (slots));
+
+ make_stdcls (&scm_class_foreign_class, "<foreign-class>",
+ scm_class_class, scm_class_class,
+ scm_list_2 (scm_list_3 (scm_from_locale_symbol ("constructor"),
+ k_class,
+ scm_class_opaque),
+ scm_list_3 (scm_from_locale_symbol ("destructor"),
+ k_class,
+ scm_class_opaque)));
+ make_stdcls (&scm_class_foreign_object, "<foreign-object>",
+ scm_class_foreign_class, scm_class_object, SCM_EOL);
+ SCM_SET_CLASS_FLAGS (scm_class_foreign_object, SCM_CLASSF_FOREIGN);
+
+ /* scm_class_generic functions classes */
+ make_stdcls (&scm_class_procedure_class, "<procedure-class>",
+ scm_class_class, scm_class_class, SCM_EOL);
+ make_stdcls (&scm_class_entity_class, "<entity-class>",
+ scm_class_class, scm_class_procedure_class, SCM_EOL);
+ make_stdcls (&scm_class_operator_class, "<operator-class>",
+ scm_class_class, scm_class_procedure_class, SCM_EOL);
+ make_stdcls (&scm_class_operator_with_setter_class,
+ "<operator-with-setter-class>",
+ scm_class_class, scm_class_operator_class, SCM_EOL);
+ make_stdcls (&scm_class_method, "<method>",
+ scm_class_class, scm_class_object, method_slots);
+ make_stdcls (&scm_class_simple_method, "<simple-method>",
+ scm_class_class, scm_class_method, SCM_EOL);
+ SCM_SET_CLASS_FLAGS (scm_class_simple_method, SCM_CLASSF_SIMPLE_METHOD);
+ make_stdcls (&scm_class_accessor_method, "<accessor-method>",
+ scm_class_class, scm_class_simple_method, amethod_slots);
+ SCM_SET_CLASS_FLAGS (scm_class_accessor_method, SCM_CLASSF_ACCESSOR_METHOD);
+ make_stdcls (&scm_class_applicable, "<applicable>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_entity, "<entity>",
+ scm_class_entity_class,
+ scm_list_2 (scm_class_object, scm_class_applicable),
+ SCM_EOL);
+ make_stdcls (&scm_class_entity_with_setter, "<entity-with-setter>",
+ scm_class_entity_class, scm_class_entity, SCM_EOL);
+ make_stdcls (&scm_class_generic, "<generic>",
+ scm_class_entity_class, scm_class_entity, gf_slots);
+ SCM_SET_CLASS_FLAGS (scm_class_generic, SCM_CLASSF_PURE_GENERIC);
+ make_stdcls (&scm_class_extended_generic, "<extended-generic>",
+ scm_class_entity_class, scm_class_generic, egf_slots);
+ SCM_SET_CLASS_FLAGS (scm_class_extended_generic, SCM_CLASSF_PURE_GENERIC);
+ make_stdcls (&scm_class_generic_with_setter, "<generic-with-setter>",
+ scm_class_entity_class,
+ scm_list_2 (scm_class_generic, scm_class_entity_with_setter),
+ SCM_EOL);
+ SCM_SET_CLASS_FLAGS (scm_class_generic_with_setter, SCM_CLASSF_PURE_GENERIC);
+ make_stdcls (&scm_class_accessor, "<accessor>",
+ scm_class_entity_class, scm_class_generic_with_setter, SCM_EOL);
+ SCM_SET_CLASS_FLAGS (scm_class_accessor, SCM_CLASSF_PURE_GENERIC);
+ make_stdcls (&scm_class_extended_generic_with_setter,
+ "<extended-generic-with-setter>",
+ scm_class_entity_class,
+ scm_list_2 (scm_class_generic_with_setter,
+ scm_class_extended_generic),
+ SCM_EOL);
+ SCM_SET_CLASS_FLAGS (scm_class_extended_generic_with_setter,
+ SCM_CLASSF_PURE_GENERIC);
+ make_stdcls (&scm_class_extended_accessor, "<extended-accessor>",
+ scm_class_entity_class,
+ scm_list_2 (scm_class_accessor,
+ scm_class_extended_generic_with_setter),
+ SCM_EOL);
+ fix_cpl (scm_class_extended_accessor,
+ scm_class_extended_generic, scm_class_generic);
+ SCM_SET_CLASS_FLAGS (scm_class_extended_accessor, SCM_CLASSF_PURE_GENERIC);
+
+ /* Primitive types classes */
+ make_stdcls (&scm_class_boolean, "<boolean>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_char, "<char>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_list, "<list>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_pair, "<pair>",
+ scm_class_class, scm_class_list, SCM_EOL);
+ make_stdcls (&scm_class_null, "<null>",
+ scm_class_class, scm_class_list, SCM_EOL);
+ make_stdcls (&scm_class_string, "<string>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_symbol, "<symbol>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_vector, "<vector>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_number, "<number>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_complex, "<complex>",
+ scm_class_class, scm_class_number, SCM_EOL);
+ make_stdcls (&scm_class_real, "<real>",
+ scm_class_class, scm_class_complex, SCM_EOL);
+ make_stdcls (&scm_class_integer, "<integer>",
+ scm_class_class, scm_class_real, SCM_EOL);
+ make_stdcls (&scm_class_fraction, "<fraction>",
+ scm_class_class, scm_class_real, SCM_EOL);
+ make_stdcls (&scm_class_keyword, "<keyword>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_unknown, "<unknown>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_procedure, "<procedure>",
+ scm_class_procedure_class, scm_class_applicable, SCM_EOL);
+ make_stdcls (&scm_class_procedure_with_setter, "<procedure-with-setter>",
+ scm_class_procedure_class, scm_class_procedure, SCM_EOL);
+ make_stdcls (&scm_class_primitive_generic, "<primitive-generic>",
+ scm_class_procedure_class, scm_class_procedure, SCM_EOL);
+ make_stdcls (&scm_class_port, "<port>",
+ scm_class_class, scm_class_top, SCM_EOL);
+ make_stdcls (&scm_class_input_port, "<input-port>",
+ scm_class_class, scm_class_port, SCM_EOL);
+ make_stdcls (&scm_class_output_port, "<output-port>",
+ scm_class_class, scm_class_port, SCM_EOL);
+ make_stdcls (&scm_class_input_output_port, "<input-output-port>",
+ scm_class_class,
+ scm_list_2 (scm_class_input_port, scm_class_output_port),
+ SCM_EOL);
+}
+
+/**********************************************************************
+ *
+ * Smob classes
+ *
+ **********************************************************************/
+
+static SCM
+make_class_from_template (char const *template, char const *type_name, SCM supers, int applicablep)
+{
+ SCM class, name;
+ if (type_name)
+ {
+ char buffer[100];
+ sprintf (buffer, template, type_name);
+ name = scm_from_locale_symbol (buffer);
+ }
+ else
+ name = SCM_GOOPS_UNBOUND;
+
+ class = scm_permanent_object (scm_basic_make_class (applicablep
+ ? scm_class_procedure_class
+ : scm_class_class,
+ name,
+ supers,
+ SCM_EOL));
+
+ /* Only define name if doesn't already exist. */
+ if (!SCM_GOOPS_UNBOUNDP (name)
+ && scm_is_false (scm_call_2 (scm_goops_lookup_closure, name, SCM_BOOL_F)))
+ DEFVAR (name, class);
+ return class;
+}
+
+SCM
+scm_make_extended_class (char const *type_name, int applicablep)
+{
+ return make_class_from_template ("<%s>",
+ type_name,
+ scm_list_1 (applicablep
+ ? scm_class_applicable
+ : scm_class_top),
+ applicablep);
+}
+
+void
+scm_i_inherit_applicable (SCM c)
+{
+ if (!SCM_SUBCLASSP (c, scm_class_applicable))
+ {
+ SCM dsupers = SCM_SLOT (c, scm_si_direct_supers);
+ SCM cpl = SCM_SLOT (c, scm_si_cpl);
+ /* patch scm_class_applicable into direct-supers */
+ SCM top = scm_c_memq (scm_class_top, dsupers);
+ if (scm_is_false (top))
+ dsupers = scm_append (scm_list_2 (dsupers,
+ scm_list_1 (scm_class_applicable)));
+ else
+ {
+ SCM_SETCAR (top, scm_class_applicable);
+ SCM_SETCDR (top, scm_cons (scm_class_top, SCM_CDR (top)));
+ }
+ SCM_SET_SLOT (c, scm_si_direct_supers, dsupers);
+ /* patch scm_class_applicable into cpl */
+ top = scm_c_memq (scm_class_top, cpl);
+ if (scm_is_false (top))
+ abort ();
+ else
+ {
+ SCM_SETCAR (top, scm_class_applicable);
+ SCM_SETCDR (top, scm_cons (scm_class_top, SCM_CDR (top)));
+ }
+ /* add class to direct-subclasses of scm_class_applicable */
+ SCM_SET_SLOT (scm_class_applicable,
+ scm_si_direct_subclasses,
+ scm_cons (c, SCM_SLOT (scm_class_applicable,
+ scm_si_direct_subclasses)));
+ }
+}
+
+static void
+create_smob_classes (void)
+{
+ long i;
+
+ scm_smob_class = (SCM *) scm_malloc (255 * sizeof (SCM));
+ for (i = 0; i < 255; ++i)
+ scm_smob_class[i] = 0;
+
+ scm_smob_class[SCM_TC2SMOBNUM (scm_tc16_keyword)] = scm_class_keyword;
+
+ for (i = 0; i < scm_numsmob; ++i)
+ if (!scm_smob_class[i])
+ scm_smob_class[i] = scm_make_extended_class (SCM_SMOBNAME (i),
+ scm_smobs[i].apply != 0);
+}
+
+void
+scm_make_port_classes (long ptobnum, char *type_name)
+{
+ SCM c, class = make_class_from_template ("<%s-port>",
+ type_name,
+ scm_list_1 (scm_class_port),
+ 0);
+ scm_port_class[SCM_IN_PCLASS_INDEX + ptobnum]
+ = make_class_from_template ("<%s-input-port>",
+ type_name,
+ scm_list_2 (class, scm_class_input_port),
+ 0);
+ scm_port_class[SCM_OUT_PCLASS_INDEX + ptobnum]
+ = make_class_from_template ("<%s-output-port>",
+ type_name,
+ scm_list_2 (class, scm_class_output_port),
+ 0);
+ scm_port_class[SCM_INOUT_PCLASS_INDEX + ptobnum]
+ = c
+ = make_class_from_template ("<%s-input-output-port>",
+ type_name,
+ scm_list_2 (class, scm_class_input_output_port),
+ 0);
+ /* Patch cpl (since this tree is too complex for the C level compute-cpl) */
+ SCM_SET_SLOT (c, scm_si_cpl,
+ scm_cons2 (c, class, SCM_SLOT (scm_class_input_output_port, scm_si_cpl)));
+}
+
+static void
+create_port_classes (void)
+{
+ long i;
+
+ scm_port_class = (SCM *) scm_malloc (3 * 256 * sizeof (SCM));
+ for (i = 0; i < 3 * 256; ++i)
+ scm_port_class[i] = 0;
+
+ for (i = 0; i < scm_numptob; ++i)
+ scm_make_port_classes (i, SCM_PTOBNAME (i));
+}
+
+static SCM
+make_struct_class (void *closure SCM_UNUSED,
+ SCM vtable, SCM data, SCM prev SCM_UNUSED)
+{
+ if (scm_is_true (SCM_STRUCT_TABLE_NAME (data)))
+ SCM_SET_STRUCT_TABLE_CLASS (data,
+ scm_make_extended_class
+ (scm_i_symbol_chars (SCM_STRUCT_TABLE_NAME (data)),
+ SCM_CLASS_FLAGS (vtable) & SCM_CLASSF_OPERATOR));
+ return SCM_UNSPECIFIED;
+}
+
+static void
+create_struct_classes (void)
+{
+ scm_internal_hash_fold (make_struct_class, 0, SCM_BOOL_F, scm_struct_table);
+}
+
+/**********************************************************************
+ *
+ * C interface
+ *
+ **********************************************************************/
+
+void
+scm_load_goops ()
+{
+ if (!goops_loaded_p)
+ scm_c_resolve_module ("oop goops");
+}
+
+
+SCM
+scm_make_foreign_object (SCM class, SCM initargs)
+#define FUNC_NAME s_scm_make
+{
+ void * (*constructor) (SCM)
+ = (void * (*) (SCM)) SCM_SLOT (class, scm_si_constructor);
+ if (constructor == 0)
+ SCM_MISC_ERROR ("Can't make instances of class ~S", scm_list_1 (class));
+ return scm_wrap_object (class, constructor (initargs));
+}
+#undef FUNC_NAME
+
+
+static size_t
+scm_free_foreign_object (SCM *class, SCM *data)
+{
+ size_t (*destructor) (void *)
+ = (size_t (*) (void *)) class[scm_si_destructor];
+ return destructor (data);
+}
+
+SCM
+scm_make_class (SCM meta, char *s_name, SCM supers, size_t size,
+ void * (*constructor) (SCM initargs),
+ size_t (*destructor) (void *))
+{
+ SCM name, class;
+ name = scm_from_locale_symbol (s_name);
+ if (scm_is_null (supers))
+ supers = scm_list_1 (scm_class_foreign_object);
+ class = scm_basic_basic_make_class (meta, name, supers, SCM_EOL);
+ scm_sys_inherit_magic_x (class, supers);
+
+ if (destructor != 0)
+ {
+ SCM_SET_SLOT (class, scm_si_destructor, (SCM) destructor);
+ SCM_SET_CLASS_DESTRUCTOR (class, scm_free_foreign_object);
+ }
+ else if (size > 0)
+ {
+ SCM_SET_CLASS_DESTRUCTOR (class, scm_struct_free_light);
+ SCM_SET_CLASS_INSTANCE_SIZE (class, size);
+ }
+
+ SCM_SET_SLOT (class, scm_si_layout, scm_from_locale_symbol (""));
+ SCM_SET_SLOT (class, scm_si_constructor, (SCM) constructor);
+
+ return class;
+}
+
+SCM_SYMBOL (sym_o, "o");
+SCM_SYMBOL (sym_x, "x");
+
+SCM_KEYWORD (k_accessor, "accessor");
+SCM_KEYWORD (k_getter, "getter");
+
+static SCM
+default_setter (SCM obj SCM_UNUSED, SCM c SCM_UNUSED)
+{
+ scm_misc_error ("slot-set!", "read-only slot", SCM_EOL);
+ return 0;
+}
+
+void
+scm_add_slot (SCM class, char *slot_name, SCM slot_class,
+ SCM (*getter) (SCM obj),
+ SCM (*setter) (SCM obj, SCM x),
+ char *accessor_name)
+{
+ {
+ SCM get = scm_c_make_subr ("goops:get", scm_tc7_subr_1, getter);
+ SCM set = scm_c_make_subr ("goops:set", scm_tc7_subr_2,
+ setter ? setter : default_setter);
+
+ /* Dirk:FIXME:: The following two expressions make use of the fact that
+ * the memoizer will accept a subr-object in the place of a function.
+ * This is not guaranteed to stay this way. */
+ SCM getm = scm_i_eval_x (scm_list_3 (scm_sym_lambda,
+ scm_list_1 (sym_o),
+ scm_list_2 (get, sym_o)),
+ SCM_EOL);
+ SCM setm = scm_i_eval_x (scm_list_3 (scm_sym_lambda,
+ scm_list_2 (sym_o, sym_x),
+ scm_list_3 (set, sym_o, sym_x)),
+ SCM_EOL);
+
+ {
+ SCM name = scm_from_locale_symbol (slot_name);
+ SCM aname = scm_from_locale_symbol (accessor_name);
+ SCM gf = scm_ensure_accessor (aname);
+ SCM slot = scm_list_5 (name,
+ k_class,
+ slot_class,
+ setter ? k_accessor : k_getter,
+ gf);
+ scm_add_method (gf, scm_make (scm_list_5 (scm_class_accessor_method,
+ k_specializers,
+ scm_list_1 (class),
+ k_procedure,
+ getm)));
+ scm_add_method (scm_setter (gf),
+ scm_make (scm_list_5 (scm_class_accessor_method,
+ k_specializers,
+ scm_list_2 (class, scm_class_top),
+ k_procedure,
+ setm)));
+ DEFVAR (aname, gf);
+
+ SCM_SET_SLOT (class, scm_si_slots,
+ scm_append_x (scm_list_2 (SCM_SLOT (class, scm_si_slots),
+ scm_list_1 (slot))));
+ {
+ SCM n = SCM_SLOT (class, scm_si_nfields);
+ SCM gns = scm_list_n (name, SCM_BOOL_F, get, set, n, scm_from_int (1),
+ SCM_UNDEFINED);
+ SCM_SET_SLOT (class, scm_si_getters_n_setters,
+ scm_append_x (scm_list_2 (SCM_SLOT (class, scm_si_getters_n_setters),
+ scm_list_1 (gns))));
+ SCM_SET_SLOT (class, scm_si_nfields, scm_sum (n, scm_from_int (1)));
+ }
+ }
+ }
+}
+
+SCM
+scm_wrap_object (SCM class, void *data)
+{
+ return scm_double_cell (SCM_UNPACK (SCM_CDR (class)) | scm_tc3_struct,
+ (scm_t_bits) data,
+ 0, 0);
+}
+
+SCM scm_components;
+
+SCM
+scm_wrap_component (SCM class, SCM container, void *data)
+{
+ SCM obj = scm_wrap_object (class, data);
+ SCM handle = scm_hash_fn_create_handle_x (scm_components,
+ obj,
+ SCM_BOOL_F,
+ scm_struct_ihashq,
+ scm_sloppy_assq,
+ 0);
+ SCM_SETCDR (handle, container);
+ return obj;
+}
+
+SCM
+scm_ensure_accessor (SCM name)
+{
+ SCM gf = scm_call_2 (SCM_TOP_LEVEL_LOOKUP_CLOSURE, name, SCM_BOOL_F);
+ if (!SCM_IS_A_P (gf, scm_class_accessor))
+ {
+ gf = scm_make (scm_list_3 (scm_class_generic, k_name, name));
+ gf = scm_make (scm_list_5 (scm_class_accessor,
+ k_name, name, k_setter, gf));
+ }
+ return gf;
+}
+
+SCM_SYMBOL (sym_internal_add_method_x, "internal-add-method!");
+
+void
+scm_add_method (SCM gf, SCM m)
+{
+ scm_eval (scm_list_3 (sym_internal_add_method_x, gf, m), scm_module_goops);
+}
+
+#ifdef GUILE_DEBUG
+/*
+ * Debugging utilities
+ */
+
+SCM_DEFINE (scm_pure_generic_p, "pure-generic?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is a pure generic.")
+#define FUNC_NAME s_scm_pure_generic_p
+{
+ return scm_from_bool (SCM_PUREGENERICP (obj));
+}
+#undef FUNC_NAME
+
+#endif /* GUILE_DEBUG */
+
+/*
+ * Initialization
+ */
+
+SCM_DEFINE (scm_sys_goops_loaded, "%goops-loaded", 0, 0, 0,
+ (),
+ "Announce that GOOPS is loaded and perform initialization\n"
+ "on the C level which depends on the loaded GOOPS modules.")
+#define FUNC_NAME s_scm_sys_goops_loaded
+{
+ goops_loaded_p = 1;
+ var_compute_applicable_methods =
+ scm_sym2var (sym_compute_applicable_methods, scm_goops_lookup_closure,
+ SCM_BOOL_F);
+ setup_extended_primitive_generics ();
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM scm_module_goops;
+
+SCM
+scm_init_goops_builtins (void)
+{
+ scm_module_goops = scm_current_module ();
+ scm_goops_lookup_closure = scm_module_lookup_closure (scm_module_goops);
+
+ /* Not really necessary right now, but who knows...
+ */
+ scm_permanent_object (scm_module_goops);
+ scm_permanent_object (scm_goops_lookup_closure);
+
+ scm_components = scm_permanent_object (scm_make_weak_key_hash_table
+ (scm_from_int (37)));
+
+ goops_rstate = scm_c_make_rstate ("GOOPS", 5);
+
+#include "libguile/goops.x"
+
+ list_of_no_method = scm_permanent_object (scm_list_1 (sym_no_method));
+
+ hell = scm_calloc (hell_size * sizeof (*hell));
+ hell_mutex = scm_permanent_object (scm_make_mutex ());
+
+ create_basic_classes ();
+ create_standard_classes ();
+ create_smob_classes ();
+ create_struct_classes ();
+ create_port_classes ();
+
+ {
+ SCM name = scm_from_locale_symbol ("no-applicable-method");
+ scm_no_applicable_method
+ = scm_permanent_object (scm_make (scm_list_3 (scm_class_generic,
+ k_name,
+ name)));
+ DEFVAR (name, scm_no_applicable_method);
+ }
+
+ return SCM_UNSPECIFIED;
+}
+
+void
+scm_init_goops ()
+{
+ scm_c_define_gsubr ("%init-goops-builtins", 0, 0, 0,
+ scm_init_goops_builtins);
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
projects / lilypond.git / blobdiff