-/* Copyright (C) 1998,1999,2000,2001,2002,2003,2004,2008,2009,2010,2011,2012,2013,2014,2015
- * 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
- */
-\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 "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/gsubr.h"
-#include "libguile/hashtab.h"
-#include "libguile/keywords.h"
-#include "libguile/macros.h"
-#include "libguile/modules.h"
-#include "libguile/ports.h"
-#include "libguile/procprop.h"
-#include "libguile/programs.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/vm.h"
-
-#include "libguile/validate.h"
-#include "libguile/goops.h"
-
-/* Port classes */
-#define SCM_IN_PCLASS_INDEX 0
-#define SCM_OUT_PCLASS_INDEX SCM_I_MAX_PORT_TYPE_COUNT
-#define SCM_INOUT_PCLASS_INDEX (2 * SCM_I_MAX_PORT_TYPE_COUNT)
-
-/* Objects have identity, so references to classes and instances are by
- value, not by reference. Redefinition of a class or modification of
- an instance causes in-place update; you can think of GOOPS as
- building in its own indirection, and for that reason referring to
- GOOPS values by variable reference is unnecessary.
-
- References to ordinary procedures is by reference (by variable),
- though, as in the rest of Guile. */
-
-static SCM var_make_standard_class = SCM_BOOL_F;
-static SCM var_slot_unbound = SCM_BOOL_F;
-static SCM var_slot_missing = SCM_BOOL_F;
-static SCM var_no_applicable_method = SCM_BOOL_F;
-static SCM var_change_class = SCM_BOOL_F;
-
-SCM_SYMBOL (sym_slot_unbound, "slot-unbound");
-SCM_SYMBOL (sym_slot_missing, "slot-missing");
-SCM_SYMBOL (sym_no_applicable_method, "no-applicable-method");
-SCM_SYMBOL (sym_memoize_method_x, "memoize-method!");
-SCM_SYMBOL (sym_change_class, "change-class");
-
-SCM_VARIABLE (scm_var_make_extended_generic, "make-extended-generic");
-
-
-/* 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.
-*/
-
-#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 SCM_GOOPS_UNBOUND SCM_UNBOUND
-#define SCM_GOOPS_UNBOUNDP(x) (scm_is_eq (x, SCM_GOOPS_UNBOUND))
-
-static int goops_loaded_p = 0;
-static scm_t_rstate *goops_rstate;
-
-/* 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_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_applicable_struct, scm_class_applicable_struct_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_accessor_method;
-SCM scm_class_procedure_class;
-SCM scm_class_applicable_struct_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_slot;
-SCM scm_class_self, scm_class_protected;
-SCM scm_class_hidden, scm_class_opaque, scm_class_read_only;
-SCM scm_class_protected_hidden, scm_class_protected_opaque, scm_class_protected_read_only;
-SCM scm_class_scm;
-SCM scm_class_int, scm_class_float, scm_class_double;
-
-static SCM class_foreign;
-static SCM class_hashtable;
-static SCM class_fluid;
-static SCM class_dynamic_state;
-static SCM class_frame;
-static SCM class_vm_cont;
-static SCM class_bytevector;
-static SCM class_uvec;
-static SCM class_array;
-static SCM class_bitvector;
-
-static SCM vtable_class_map = SCM_BOOL_F;
-
-/* Port classes. Allocate 3 times the maximum number of port types so that
- input ports, output ports, and in/out ports can be stored at different
- offsets. See `SCM_IN_PCLASS_INDEX' et al. */
-SCM scm_port_class[3 * SCM_I_MAX_PORT_TYPE_COUNT];
-
-/* SMOB classes. */
-SCM scm_smob_class[SCM_I_MAX_SMOB_TYPE_COUNT];
-
-SCM scm_no_applicable_method;
-
-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_bless_applicable_struct_vtable_x (SCM vtable);
-static SCM scm_sys_bless_pure_generic_vtable_x (SCM vtable);
-static SCM scm_sys_make_root_class (SCM name, SCM dslots,
- SCM getters_n_setters);
-static SCM scm_sys_init_layout_x (SCM class, SCM layout);
-static SCM scm_sys_goops_early_init (void);
-static SCM scm_sys_goops_loaded (void);
-static SCM scm_make_extended_class_from_symbol (SCM type_name_sym,
- int applicablep);
-
-
-SCM
-scm_i_define_class_for_vtable (SCM vtable)
-{
- SCM class;
-
- scm_i_pthread_mutex_lock (&scm_i_misc_mutex);
- if (scm_is_false (vtable_class_map))
- vtable_class_map = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY);
- scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
-
- if (scm_is_false (scm_struct_vtable_p (vtable)))
- abort ();
-
- class = scm_weak_table_refq (vtable_class_map, vtable, SCM_BOOL_F);
-
- if (scm_is_false (class))
- {
- if (SCM_UNPACK (scm_class_class))
- {
- SCM name = SCM_VTABLE_NAME (vtable);
- if (!scm_is_symbol (name))
- name = scm_string_to_symbol (scm_nullstr);
-
- class = scm_make_extended_class_from_symbol
- (name, SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_APPLICABLE));
- }
- else
- /* `create_struct_classes' will fill this in later. */
- class = SCM_BOOL_F;
-
- /* Don't worry about races. This only happens when creating a
- vtable, which happens by definition in one thread. */
- scm_weak_table_putq_x (vtable_class_map, vtable, class);
- }
-
- return class;
-}
-
-/* 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_tc7_symbol:
- return scm_class_symbol;
- case scm_tc7_vector:
- case scm_tc7_wvect:
- return scm_class_vector;
- case scm_tc7_pointer:
- return class_foreign;
- case scm_tc7_hashtable:
- return class_hashtable;
- case scm_tc7_fluid:
- return class_fluid;
- case scm_tc7_dynamic_state:
- return class_dynamic_state;
- case scm_tc7_frame:
- return class_frame;
- case scm_tc7_keyword:
- return scm_class_keyword;
- case scm_tc7_vm_cont:
- return class_vm_cont;
- case scm_tc7_bytevector:
- if (SCM_BYTEVECTOR_ELEMENT_TYPE (x) == SCM_ARRAY_ELEMENT_TYPE_VU8)
- return class_bytevector;
- else
- return class_uvec;
- case scm_tc7_array:
- return class_array;
- case scm_tc7_bitvector:
- return class_bitvector;
- 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_program:
- if (SCM_PROGRAM_IS_PRIMITIVE_GENERIC (x)
- && SCM_UNPACK (*SCM_SUBR_GENERIC (x)))
- return scm_class_primitive_generic;
- else
- return scm_class_procedure;
-
- 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
- return scm_i_define_class_for_vtable (SCM_CLASS_OF (x));
- 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_unused: */
- /* Never reached */
- break;
- }
- return scm_class_unknown;
-}
-#undef FUNC_NAME
-
-/******************************************************************************
- *
- * 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 = SCM_GOOPS_UNBOUND;
-
- 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,
- SCM_PACK (0),
- FUNC_NAME);
- slot_name = SCM_CAR (slot_name);
- if (SCM_UNPACK (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,
- SCM_GOOPS_UNBOUND,
- FUNC_NAME);
- }
- }
-
- if (!SCM_GOOPS_UNBOUNDP (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))
- set_slot_value (class,
- obj,
- SCM_CAR (get_n_set),
- scm_call_0 (tmp));
- }
- }
-
- return obj;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_sys_init_layout_x, "%init-layout!", 2, 0, 0,
- (SCM class, SCM layout),
- "")
-#define FUNC_NAME s_scm_sys_init_layout_x
-{
- SCM_VALIDATE_INSTANCE (1, class);
- SCM_ASSERT (!scm_is_symbol (SCM_VTABLE_LAYOUT (class)), class, 1, FUNC_NAME);
- SCM_VALIDATE_STRING (2, layout);
-
- SCM_SET_VTABLE_LAYOUT (class, scm_make_struct_layout (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_VALIDATE_INSTANCE (1, class);
- scm_i_struct_inherit_vtable_magic (SCM_CLASS_OF (class), class);
- SCM_SET_CLASS_FLAGS (class, SCM_CLASSF_GOOPS_OR_VALID);
-
- prep_hashsets (class);
-
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-static void
-prep_hashsets (SCM class)
-{
- unsigned int i;
-
- for (i = 0; i < 8; ++i)
- SCM_SET_HASHSET (class, i, scm_c_uniform32 (goops_rstate));
-}
-
-/******************************************************************************/
-
-SCM
-scm_basic_make_class (SCM class, SCM name, SCM dsupers, SCM dslots)
-{
- return scm_call_4 (scm_variable_ref (var_make_standard_class),
- class, name, dsupers, dslots);
-}
-
-/******************************************************************************/
-
-SCM_DEFINE (scm_sys_make_root_class, "%make-root-class", 3, 0, 0,
- (SCM name, SCM dslots, SCM getters_n_setters),
- "")
-#define FUNC_NAME s_scm_sys_make_root_class
-{
- SCM cs, z;
-
- cs = scm_from_locale_string (SCM_CLASS_CLASS_LAYOUT);
- z = scm_i_make_vtable_vtable (cs);
- SCM_SET_CLASS_FLAGS (z, (SCM_CLASSF_GOOPS_OR_VALID
- | SCM_CLASSF_METACLASS));
-
- SCM_SET_SLOT (z, scm_vtable_index_name, name);
- SCM_SET_SLOT (z, scm_si_direct_supers, SCM_EOL); /* will be changed */
- SCM_SET_SLOT (z, scm_si_direct_slots, dslots); /* will be changed */
- 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, SCM_EOL); /* will be changed */
- SCM_SET_SLOT (z, scm_si_slots, dslots); /* will be changed */
- SCM_SET_SLOT (z, scm_si_nfields, scm_from_int (SCM_N_CLASS_SLOTS));
- SCM_SET_SLOT (z, scm_si_getters_n_setters, getters_n_setters); /* will be changed */
- SCM_SET_SLOT (z, scm_si_redefined, SCM_BOOL_F);
-
- prep_hashsets (z);
-
- return z;
-}
-#undef FUNC_NAME
-
-/******************************************************************************/
-
-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_SYMBOL (sym_procedure, "procedure");
-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_slots, "slots");
-
-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, scm_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_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_latin1_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_latin1_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
-
-/******************************************************************************
- *
- * 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 scm_call_1 (SCM_VARIABLE_REF (var_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 scm_call_1 (SCM_VARIABLE_REF (var_slot_unbound), obj);
- return value;
-}
-#undef FUNC_NAME
-
-
-\f
-/** 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_is_eq (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
- return scm_call_1 (SCM_CAR (access), obj);
-}
-#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 scm_call_3 (SCM_VARIABLE_REF (var_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
- /* ((cadr l) obj value) */
- scm_call_2 (SCM_CADR (access), obj, value);
- 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 scm_call_4 (SCM_VARIABLE_REF (var_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 scm_call_3 (SCM_VARIABLE_REF (var_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 scm_call_3 (SCM_VARIABLE_REF (var_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);
-
-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 obj;
- scm_t_signed_bits n, i;
- SCM layout;
-
- SCM_VALIDATE_CLASS (1, class);
-
- /* FIXME: duplicates some of scm_make_struct. */
-
- n = SCM_I_INUM (SCM_SLOT (class, scm_si_nfields));
- obj = scm_i_alloc_struct (SCM_STRUCT_DATA (class), n);
-
- layout = SCM_VTABLE_LAYOUT (class);
-
- /* Set all SCM-holding slots to unbound */
- for (i = 0; i < n; i++)
- {
- scm_t_wchar c = scm_i_symbol_ref (layout, i*2);
- if (c == 'p')
- SCM_STRUCT_DATA (obj)[i] = SCM_UNPACK (SCM_GOOPS_UNBOUND);
- else if (c == 's')
- SCM_STRUCT_DATA (obj)[i] = SCM_UNPACK (obj);
- else
- SCM_STRUCT_DATA (obj)[i] = 0;
- }
-
- if (SCM_CLASS_FLAGS (class) & SCM_CLASSF_PURE_GENERIC)
- clear_method_cache (obj);
-
- return obj;
-}
-#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_OBJ_CLASS_FLAGS (obj) & SCM_CLASSF_PURE_GENERIC),
- obj,
- SCM_ARG1,
- FUNC_NAME);
- SCM_SET_GENERIC_SETTER (obj, 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_t_bits word0, word1;
- word0 = SCM_CELL_WORD_0 (old);
- word1 = SCM_CELL_WORD_1 (old);
- SCM_SET_CELL_WORD_0 (old, SCM_CELL_WORD_0 (new));
- SCM_SET_CELL_WORD_1 (old, SCM_CELL_WORD_1 (new));
- SCM_SET_CELL_WORD_0 (new, word0);
- SCM_SET_CELL_WORD_1 (new, word1);
- }
- 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_t_bits word0, word1;
- word0 = SCM_CELL_WORD_0 (old);
- word1 = SCM_CELL_WORD_1 (old);
- SCM_SET_CELL_WORD_0 (old, SCM_CELL_WORD_0 (new));
- SCM_SET_CELL_WORD_1 (old, SCM_CELL_WORD_1 (new));
- SCM_STRUCT_DATA (old)[scm_vtable_index_self] = SCM_UNPACK (old);
- SCM_SET_CELL_WORD_0 (new, word0);
- SCM_SET_CELL_WORD_1 (new, word1);
- SCM_STRUCT_DATA (new)[scm_vtable_index_self] = 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*)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 obj = *(SCM*)o;
- scm_lock_mutex (hell_mutex);
- hell[burnin (obj)] = hell[--n_hell];
- scm_unlock_mutex (hell_mutex);
-}
-
-
-SCM_SYMBOL (scm_sym_change_class, "change-class");
-
-static SCM
-purgatory (SCM obj, SCM new_class)
-{
- return scm_call_2 (SCM_VARIABLE_REF (var_change_class), obj, new_class);
-}
-
-/* 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_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
- scm_dynwind_rewind_handler (go_to_hell, &obj, SCM_F_WIND_EXPLICITLY);
- scm_dynwind_unwind_handler (go_to_heaven, &obj, SCM_F_WIND_EXPLICITLY);
- purgatory (obj, new_class);
- scm_dynwind_end ();
- }
-}
-
-/******************************************************************************
- *
- * 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_GLOBAL_SYMBOL (scm_sym_args, "args");
-
-SCM_SYMBOL (sym_delayed_compile, "delayed-compile");
-
-static SCM delayed_compile_var;
-
-static void
-init_delayed_compile_var (void)
-{
- delayed_compile_var
- = scm_c_private_lookup ("oop goops dispatch", "delayed-compile");
-}
-
-static SCM
-make_dispatch_procedure (SCM gf)
-{
- static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT;
- scm_i_pthread_once (&once, init_delayed_compile_var);
-
- return scm_call_1 (scm_variable_ref (delayed_compile_var), gf);
-}
-
-static void
-clear_method_cache (SCM gf)
-{
- SCM_SET_GENERIC_DISPATCH_PROCEDURE (gf, make_dispatch_procedure (gf));
- SCM_CLEAR_GENERIC_EFFECTIVE_METHODS (gf);
-}
-
-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_ASSERT (SCM_PUREGENERICP (gf), gf, SCM_ARG1, FUNC_NAME);
- clear_method_cache (gf);
- 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_PRIMITIVE_GENERIC_P (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_PRIMITIVE_GENERIC_P (subr), subr, SCM_ARGn, FUNC_NAME);
- SCM_SET_SUBR_GENERIC (subr,
- scm_make (scm_list_3 (scm_class_generic,
- k_name,
- SCM_SUBR_NAME (subr))));
- subrs = SCM_CDR (subrs);
- }
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_set_primitive_generic_x, "set-primitive-generic!", 2, 0, 0,
- (SCM subr, SCM generic),
- "")
-#define FUNC_NAME s_scm_set_primitive_generic_x
-{
- SCM_ASSERT (SCM_PRIMITIVE_GENERIC_P (subr), subr, SCM_ARG1, FUNC_NAME);
- SCM_ASSERT (SCM_PUREGENERICP (generic), generic, SCM_ARG2, FUNC_NAME);
- SCM_SET_SUBR_GENERIC (subr, generic);
- 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_PRIMITIVE_GENERIC_P (subr))
- {
- if (!SCM_UNPACK (*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;
-
-
-/* Hint for `scm_gc_malloc ()' et al. when allocating `t_extension'
- objects. */
-static const char extension_gc_hint[] = "GOOPS extension";
-
-static t_extension *extensions = 0;
-
-void
-scm_c_extend_primitive_generic (SCM extended, SCM extension)
-{
- if (goops_loaded_p)
- {
- SCM gf, gext;
- if (!SCM_UNPACK (*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_SUBR_NAME (extension));
- SCM_SET_SUBR_GENERIC (extension, gext);
- }
- else
- {
- t_extension *e = scm_gc_malloc (sizeof (t_extension),
- extension_gc_hint);
- 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 && !scm_is_eq (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;
- }
-}
-
-/* Dirk:FIXME:: In all of these scm_wta_dispatch_* routines it is
- * assumed that 'gf' is zero if uninitialized. It would be cleaner if
- * some valid SCM value like SCM_BOOL_F or SCM_UNDEFINED were chosen.
- */
-
-SCM
-scm_wta_dispatch_0 (SCM gf, const char *subr)
-{
- if (!SCM_UNPACK (gf))
- scm_error_num_args_subr (subr);
-
- return scm_call_0 (gf);
-}
-
-SCM
-scm_wta_dispatch_1 (SCM gf, SCM a1, int pos, const char *subr)
-{
- if (!SCM_UNPACK (gf))
- scm_wrong_type_arg (subr, pos, a1);
-
- return scm_call_1 (gf, a1);
-}
-
-SCM
-scm_wta_dispatch_2 (SCM gf, SCM a1, SCM a2, int pos, const char *subr)
-{
- if (!SCM_UNPACK (gf))
- scm_wrong_type_arg (subr, pos, (pos == SCM_ARG1) ? a1 : a2);
-
- return scm_call_2 (gf, a1, a2);
-}
-
-SCM
-scm_wta_dispatch_n (SCM gf, SCM args, int pos, const char *subr)
-{
- if (!SCM_UNPACK (gf))
- scm_wrong_type_arg (subr, pos, scm_list_ref (args, scm_from_int (pos)));
-
- return scm_apply_0 (gf, args);
-}
-
-/******************************************************************************
- *
- * 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.
- *
- ******************************************************************************/
-
-/******************************************************************************
- *
- * 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_formals, "formals");
-SCM_KEYWORD (k_body, "body");
-SCM_KEYWORD (k_make_procedure, "make-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 (scm_is_eq (class, scm_class_generic)
- || scm_is_eq (class, scm_class_accessor))
- {
- z = scm_make_struct (class, SCM_INUM0,
- scm_list_4 (SCM_BOOL_F,
- SCM_EOL,
- SCM_INUM0,
- 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 (scm_is_eq (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 (scm_is_eq (class, scm_class_method)
- || scm_is_eq (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_BOOL_F,
- FUNC_NAME));
- SCM_SET_SLOT (z, scm_si_formals,
- scm_i_get_keyword (k_formals,
- args,
- len - 1,
- SCM_EOL,
- FUNC_NAME));
- SCM_SET_SLOT (z, scm_si_body,
- scm_i_get_keyword (k_body,
- args,
- len - 1,
- SCM_EOL,
- FUNC_NAME));
- SCM_SET_SLOT (z, scm_si_make_procedure,
- scm_i_get_keyword (k_make_procedure,
- args,
- len - 1,
- SCM_BOOL_F,
- FUNC_NAME));
- }
- else
- {
- /* In all the others case, make a new class .... No instance here */
- SCM_SET_SLOT (z, scm_vtable_index_name,
- scm_i_get_keyword (k_name,
- args,
- len - 1,
- scm_from_latin1_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
-
-
-/**********************************************************************
- *
- * Smob classes
- *
- **********************************************************************/
-
-static SCM
-make_class_from_template (char const *template, char const *type_name, SCM supers, int applicablep)
-{
- SCM meta, name;
-
- if (type_name)
- {
- char buffer[100];
- sprintf (buffer, template, type_name);
- name = scm_from_utf8_symbol (buffer);
- }
- else
- name = SCM_GOOPS_UNBOUND;
-
- meta = applicablep ? scm_class_procedure_class : scm_class_class;
-
- return scm_basic_make_class (meta, name, supers, SCM_EOL);
-}
-
-static SCM
-make_class_from_symbol (SCM type_name_sym, SCM supers, int applicablep)
-{
- SCM meta, name;
-
- if (scm_is_true (type_name_sym))
- {
- name = scm_string_append (scm_list_3 (scm_from_locale_string ("<"),
- scm_symbol_to_string (type_name_sym),
- scm_from_locale_string (">")));
- name = scm_string_to_symbol (name);
- }
- else
- name = SCM_GOOPS_UNBOUND;
-
- meta = applicablep ? scm_class_procedure_class : scm_class_class;
-
- return scm_basic_make_class (meta, name, supers, SCM_EOL);
-}
-
-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);
-}
-
-static SCM
-scm_make_extended_class_from_symbol (SCM type_name_sym, int applicablep)
-{
- return make_class_from_symbol (type_name_sym,
- 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;
-
- for (i = 0; i < SCM_I_MAX_SMOB_TYPE_COUNT; ++i)
- scm_smob_class[i] = SCM_BOOL_F;
-
- for (i = 0; i < scm_numsmob; ++i)
- if (scm_is_false (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;
-
- for (i = scm_c_num_port_types () - 1; i >= 0; 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_false (data))
- scm_i_define_class_for_vtable (vtable);
- return SCM_UNSPECIFIED;
-}
-
-static void
-create_struct_classes (void)
-{
- /* FIXME: take the vtable_class_map while initializing goops? */
- scm_internal_hash_fold (make_struct_class, 0, SCM_BOOL_F,
- vtable_class_map);
-}
-
-/**********************************************************************
- *
- * C interface
- *
- **********************************************************************/
-
-void
-scm_load_goops ()
-{
- if (!goops_loaded_p)
- scm_c_resolve_module ("oop goops");
-}
-
-
-SCM
-scm_ensure_accessor (SCM name)
-{
- SCM var, gf;
-
- var = scm_module_variable (scm_current_module (), name);
- if (SCM_VARIABLEP (var) && !SCM_UNBNDP (SCM_VARIABLE_REF (var)))
- gf = SCM_VARIABLE_REF (var);
- else
- gf = 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;
-}
-
-#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_bless_applicable_struct_vtable_x, "%bless-applicable-struct-vtable!", 1, 0, 0,
- (SCM vtable),
- "")
-#define FUNC_NAME s_scm_sys_bless_applicable_struct_vtable_x
-{
- SCM_VALIDATE_CLASS (1, vtable);
- SCM_SET_VTABLE_FLAGS (vtable, SCM_VTABLE_FLAG_APPLICABLE_VTABLE);
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_sys_bless_pure_generic_vtable_x, "%bless-pure-generic-vtable!", 1, 0, 0,
- (SCM vtable),
- "")
-#define FUNC_NAME s_scm_sys_bless_pure_generic_vtable_x
-{
- SCM_VALIDATE_CLASS (1, vtable);
- SCM_SET_CLASS_FLAGS (vtable, SCM_CLASSF_PURE_GENERIC);
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_sys_goops_early_init, "%goops-early-init", 0, 0, 0,
- (),
- "")
-#define FUNC_NAME s_scm_sys_goops_early_init
-{
- var_make_standard_class = scm_c_lookup ("make-standard-class");
-
- scm_class_class = scm_variable_ref (scm_c_lookup ("<class>"));
- scm_class_top = scm_variable_ref (scm_c_lookup ("<top>"));
- scm_class_object = scm_variable_ref (scm_c_lookup ("<object>"));
-
- scm_class_foreign_slot = scm_variable_ref (scm_c_lookup ("<foreign-slot>"));
- scm_class_protected = scm_variable_ref (scm_c_lookup ("<protected-slot>"));
- scm_class_hidden = scm_variable_ref (scm_c_lookup ("<hidden-slot>"));
- scm_class_opaque = scm_variable_ref (scm_c_lookup ("<opaque-slot>"));
- scm_class_read_only = scm_variable_ref (scm_c_lookup ("<read-only-slot>"));
- scm_class_self = scm_variable_ref (scm_c_lookup ("<self-slot>"));
- scm_class_protected_opaque = scm_variable_ref (scm_c_lookup ("<protected-opaque-slot>"));
- scm_class_protected_hidden = scm_variable_ref (scm_c_lookup ("<protected-hidden-slot>"));
- scm_class_protected_read_only = scm_variable_ref (scm_c_lookup ("<protected-read-only-slot>"));
- scm_class_scm = scm_variable_ref (scm_c_lookup ("<scm-slot>"));
- scm_class_int = scm_variable_ref (scm_c_lookup ("<int-slot>"));
- scm_class_float = scm_variable_ref (scm_c_lookup ("<float-slot>"));
- scm_class_double = scm_variable_ref (scm_c_lookup ("<double-slot>"));
-
- /* scm_class_generic functions classes */
- scm_class_procedure_class = scm_variable_ref (scm_c_lookup ("<procedure-class>"));
- scm_class_applicable_struct_class = scm_variable_ref (scm_c_lookup ("<applicable-struct-class>"));
-
- scm_class_method = scm_variable_ref (scm_c_lookup ("<method>"));
- scm_class_accessor_method = scm_variable_ref (scm_c_lookup ("<accessor-method>"));
- scm_class_applicable = scm_variable_ref (scm_c_lookup ("<applicable>"));
- scm_class_applicable_struct = scm_variable_ref (scm_c_lookup ("<applicable-struct>"));
- scm_class_generic = scm_variable_ref (scm_c_lookup ("<generic>"));
- scm_class_extended_generic = scm_variable_ref (scm_c_lookup ("<extended-generic>"));
- scm_class_generic_with_setter = scm_variable_ref (scm_c_lookup ("<generic-with-setter>"));
- scm_class_accessor = scm_variable_ref (scm_c_lookup ("<accessor>"));
- scm_class_extended_generic_with_setter = scm_variable_ref (scm_c_lookup ("<extended-generic-with-setter>"));
- scm_class_extended_accessor = scm_variable_ref (scm_c_lookup ("<extended-accessor>"));
-
- /* Primitive types classes */
- scm_class_boolean = scm_variable_ref (scm_c_lookup ("<boolean>"));
- scm_class_char = scm_variable_ref (scm_c_lookup ("<char>"));
- scm_class_list = scm_variable_ref (scm_c_lookup ("<list>"));
- scm_class_pair = scm_variable_ref (scm_c_lookup ("<pair>"));
- scm_class_null = scm_variable_ref (scm_c_lookup ("<null>"));
- scm_class_string = scm_variable_ref (scm_c_lookup ("<string>"));
- scm_class_symbol = scm_variable_ref (scm_c_lookup ("<symbol>"));
- scm_class_vector = scm_variable_ref (scm_c_lookup ("<vector>"));
- class_foreign = scm_variable_ref (scm_c_lookup ("<foreign>"));
- class_hashtable = scm_variable_ref (scm_c_lookup ("<hashtable>"));
- class_fluid = scm_variable_ref (scm_c_lookup ("<fluid>"));
- class_dynamic_state = scm_variable_ref (scm_c_lookup ("<dynamic-state>"));
- class_frame = scm_variable_ref (scm_c_lookup ("<frame>"));
- class_vm_cont = scm_variable_ref (scm_c_lookup ("<vm-continuation>"));
- class_bytevector = scm_variable_ref (scm_c_lookup ("<bytevector>"));
- class_uvec = scm_variable_ref (scm_c_lookup ("<uvec>"));
- class_array = scm_variable_ref (scm_c_lookup ("<array>"));
- class_bitvector = scm_variable_ref (scm_c_lookup ("<bitvector>"));
- scm_class_number = scm_variable_ref (scm_c_lookup ("<number>"));
- scm_class_complex = scm_variable_ref (scm_c_lookup ("<complex>"));
- scm_class_real = scm_variable_ref (scm_c_lookup ("<real>"));
- scm_class_integer = scm_variable_ref (scm_c_lookup ("<integer>"));
- scm_class_fraction = scm_variable_ref (scm_c_lookup ("<fraction>"));
- scm_class_keyword = scm_variable_ref (scm_c_lookup ("<keyword>"));
- scm_class_unknown = scm_variable_ref (scm_c_lookup ("<unknown>"));
- scm_class_procedure = scm_variable_ref (scm_c_lookup ("<procedure>"));
- scm_class_primitive_generic = scm_variable_ref (scm_c_lookup ("<primitive-generic>"));
- scm_class_port = scm_variable_ref (scm_c_lookup ("<port>"));
- scm_class_input_port = scm_variable_ref (scm_c_lookup ("<input-port>"));
- scm_class_output_port = scm_variable_ref (scm_c_lookup ("<output-port>"));
- scm_class_input_output_port = scm_variable_ref (scm_c_lookup ("<input-output-port>"));
-
- create_smob_classes ();
- create_struct_classes ();
- create_port_classes ();
-
- {
- SCM name = scm_from_latin1_symbol ("no-applicable-method");
- scm_no_applicable_method =
- scm_make (scm_list_3 (scm_class_generic, k_name, name));
- scm_module_define (scm_module_goops, name, scm_no_applicable_method);
- }
-
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-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_slot_unbound =
- scm_module_variable (scm_module_goops, sym_slot_unbound);
- var_slot_missing =
- scm_module_variable (scm_module_goops, sym_slot_missing);
- var_no_applicable_method =
- scm_module_variable (scm_module_goops, sym_no_applicable_method);
- var_change_class =
- scm_module_variable (scm_module_goops, sym_change_class);
- setup_extended_primitive_generics ();
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-SCM scm_module_goops;
-
-static void
-scm_init_goops_builtins (void *unused)
-{
- scm_module_goops = scm_current_module ();
-
- goops_rstate = scm_c_make_rstate ("GOOPS", 5);
-
- hell = scm_calloc (hell_size * sizeof (*hell));
- hell_mutex = scm_make_mutex ();
-
-#include "libguile/goops.x"
-}
-
-void
-scm_init_goops ()
-{
- scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
- "scm_init_goops_builtins", scm_init_goops_builtins,
- NULL);
-}
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* Copyright (C) 1998,1999,2000,2001,2002,2003,2004,2008,2009,2010,2011,2012,2013,2014,2015
+ * 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
+ */
+\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 "libguile/_scm.h"
+#include "libguile/async.h"
+#include "libguile/chars.h"
+#include "libguile/dynwind.h"
+#include "libguile/eval.h"
+#include "libguile/gsubr.h"
+#include "libguile/hashtab.h"
+#include "libguile/keywords.h"
+#include "libguile/macros.h"
+#include "libguile/modules.h"
+#include "libguile/ports.h"
+#include "libguile/procprop.h"
+#include "libguile/programs.h"
+#include "libguile/smob.h"
+#include "libguile/strings.h"
+#include "libguile/strports.h"
+#include "libguile/vectors.h"
+
+#include "libguile/validate.h"
+#include "libguile/goops.h"
+
+/* Port classes */
+#define SCM_IN_PCLASS_INDEX 0
+#define SCM_OUT_PCLASS_INDEX SCM_I_MAX_PORT_TYPE_COUNT
+#define SCM_INOUT_PCLASS_INDEX (2 * SCM_I_MAX_PORT_TYPE_COUNT)
+
+/* Objects have identity, so references to classes and instances are by
+ value, not by reference. Redefinition of a class or modification of
+ an instance causes in-place update; you can think of GOOPS as
+ building in its own indirection, and for that reason referring to
+ GOOPS values by variable reference is unnecessary.
+
+ References to ordinary procedures is by reference (by variable),
+ though, as in the rest of Guile. */
+
+SCM_KEYWORD (k_name, "name");
+SCM_KEYWORD (k_setter, "setter");
+SCM_SYMBOL (sym_redefined, "redefined");
+SCM_GLOBAL_SYMBOL (scm_sym_args, "args");
+
+static int goops_loaded_p = 0;
+
+static SCM var_make_standard_class = SCM_BOOL_F;
+static SCM var_change_class = SCM_BOOL_F;
+static SCM var_make = SCM_BOOL_F;
+static SCM var_inherit_applicable = SCM_BOOL_F;
+static SCM var_class_name = SCM_BOOL_F;
+static SCM var_class_direct_supers = SCM_BOOL_F;
+static SCM var_class_direct_slots = SCM_BOOL_F;
+static SCM var_class_direct_subclasses = SCM_BOOL_F;
+static SCM var_class_direct_methods = SCM_BOOL_F;
+static SCM var_class_precedence_list = SCM_BOOL_F;
+static SCM var_class_slots = SCM_BOOL_F;
+
+static SCM var_generic_function_methods = SCM_BOOL_F;
+static SCM var_method_generic_function = SCM_BOOL_F;
+static SCM var_method_specializers = SCM_BOOL_F;
+static SCM var_method_procedure = SCM_BOOL_F;
+
+static SCM var_slot_ref = SCM_BOOL_F;
+static SCM var_slot_set_x = SCM_BOOL_F;
+static SCM var_slot_bound_p = SCM_BOOL_F;
+static SCM var_slot_exists_p = SCM_BOOL_F;
+
+/* These variables are filled in by the object system when loaded. */
+static SCM class_boolean, class_char, class_pair;
+static SCM class_procedure, class_string, class_symbol;
+static SCM class_primitive_generic;
+static SCM class_vector, class_null;
+static SCM class_integer, class_real, class_complex, class_fraction;
+static SCM class_unknown;
+static SCM class_top, class_object, class_class;
+static SCM class_applicable;
+static SCM class_applicable_struct, class_applicable_struct_with_setter;
+static SCM class_generic, class_generic_with_setter;
+static SCM class_accessor;
+static SCM class_extended_generic, class_extended_generic_with_setter;
+static SCM class_extended_accessor;
+static SCM class_method;
+static SCM class_accessor_method;
+static SCM class_procedure_class;
+static SCM class_applicable_struct_class;
+static SCM class_applicable_struct_with_setter_class;
+static SCM class_number, class_list;
+static SCM class_keyword;
+static SCM class_port, class_input_output_port;
+static SCM class_input_port, class_output_port;
+static SCM class_foreign_slot;
+static SCM class_self, class_protected;
+static SCM class_hidden, class_opaque, class_read_only;
+static SCM class_protected_hidden, class_protected_opaque, class_protected_read_only;
+static SCM class_scm;
+static SCM class_int, class_float, class_double;
+
+static SCM class_foreign;
+static SCM class_hashtable;
+static SCM class_fluid;
+static SCM class_dynamic_state;
+static SCM class_frame;
+static SCM class_keyword;
+static SCM class_vm_cont;
+static SCM class_bytevector;
+static SCM class_uvec;
+static SCM class_array;
+static SCM class_bitvector;
+
+static SCM vtable_class_map = SCM_BOOL_F;
+
+/* Port classes. Allocate 3 times the maximum number of port types so that
+ input ports, output ports, and in/out ports can be stored at different
+ offsets. See `SCM_IN_PCLASS_INDEX' et al. */
+SCM scm_i_port_class[3 * SCM_I_MAX_PORT_TYPE_COUNT];
+
+/* SMOB classes. */
+SCM scm_i_smob_class[SCM_I_MAX_SMOB_TYPE_COUNT];
+
+SCM scm_module_goops;
+
+static SCM scm_sys_make_vtable_vtable (SCM layout);
+static SCM scm_sys_init_layout_x (SCM class, SCM layout);
+static SCM scm_sys_clear_fields_x (SCM obj, SCM unbound);
+static SCM scm_sys_goops_early_init (void);
+static SCM scm_sys_goops_loaded (void);
+
+
+\f
+
+SCM_DEFINE (scm_sys_make_vtable_vtable, "%make-vtable-vtable", 1, 0, 0,
+ (SCM layout),
+ "")
+#define FUNC_NAME s_scm_sys_make_vtable_vtable
+{
+ return scm_i_make_vtable_vtable (layout);
+}
+#undef FUNC_NAME
+
+SCM
+scm_make_standard_class (SCM meta, SCM name, SCM dsupers, SCM dslots)
+{
+ return scm_call_4 (scm_variable_ref (var_make_standard_class),
+ meta, name, dsupers, dslots);
+}
+
+SCM_DEFINE (scm_sys_init_layout_x, "%init-layout!", 2, 0, 0,
+ (SCM class, SCM layout),
+ "")
+#define FUNC_NAME s_scm_sys_init_layout_x
+{
+ SCM_VALIDATE_INSTANCE (1, class);
+ SCM_ASSERT (!scm_is_symbol (SCM_VTABLE_LAYOUT (class)), class, 1, FUNC_NAME);
+ SCM_VALIDATE_STRING (2, layout);
+
+ SCM_SET_VTABLE_LAYOUT (class, scm_make_struct_layout (layout));
+ scm_i_struct_inherit_vtable_magic (SCM_CLASS_OF (class), class);
+ SCM_SET_CLASS_FLAGS (class, SCM_CLASSF_GOOPS_OR_VALID);
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+
+\f
+
+/* 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 class_integer;
+
+ case scm_tc3_imm24:
+ if (SCM_CHARP (x))
+ return class_char;
+ else if (scm_is_bool (x))
+ return class_boolean;
+ else if (scm_is_null (x))
+ return class_null;
+ else
+ return class_unknown;
+
+ case scm_tc3_cons:
+ switch (SCM_TYP7 (x))
+ {
+ case scm_tcs_cons_nimcar:
+ return class_pair;
+ case scm_tc7_symbol:
+ return class_symbol;
+ case scm_tc7_vector:
+ case scm_tc7_wvect:
+ return class_vector;
+ case scm_tc7_pointer:
+ return class_foreign;
+ case scm_tc7_hashtable:
+ return class_hashtable;
+ case scm_tc7_fluid:
+ return class_fluid;
+ case scm_tc7_dynamic_state:
+ return class_dynamic_state;
+ case scm_tc7_frame:
+ return class_frame;
+ case scm_tc7_keyword:
+ return class_keyword;
+ case scm_tc7_vm_cont:
+ return class_vm_cont;
+ case scm_tc7_bytevector:
+ if (SCM_BYTEVECTOR_ELEMENT_TYPE (x) == SCM_ARRAY_ELEMENT_TYPE_VU8)
+ return class_bytevector;
+ else
+ return class_uvec;
+ case scm_tc7_array:
+ return class_array;
+ case scm_tc7_bitvector:
+ return class_bitvector;
+ case scm_tc7_string:
+ return class_string;
+ case scm_tc7_number:
+ switch SCM_TYP16 (x) {
+ case scm_tc16_big:
+ return class_integer;
+ case scm_tc16_real:
+ return class_real;
+ case scm_tc16_complex:
+ return class_complex;
+ case scm_tc16_fraction:
+ return class_fraction;
+ }
+ case scm_tc7_program:
+ if (SCM_PROGRAM_IS_PRIMITIVE_GENERIC (x)
+ && SCM_UNPACK (*SCM_SUBR_GENERIC (x)))
+ return class_primitive_generic;
+ else
+ return class_procedure;
+
+ case scm_tc7_smob:
+ {
+ scm_t_bits type = SCM_TYP16 (x);
+ if (type != scm_tc16_port_with_ps)
+ return scm_i_smob_class[SCM_TC2SMOBNUM (type)];
+ x = SCM_PORT_WITH_PS_PORT (x);
+ /* fall through to ports */
+ }
+ case scm_tc7_port:
+ return scm_i_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)
+ /* A GOOPS object with a valid class. */
+ return SCM_CLASS_OF (x);
+ else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
+ /* A GOOPS object whose class might have been redefined. */
+ {
+ SCM class = SCM_CLASS_OF (x);
+ SCM new_class = scm_slot_ref (class, sym_redefined);
+ if (!scm_is_false (new_class))
+ scm_change_object_class (x, class, new_class);
+ /* Re-load class from instance. */
+ return SCM_CLASS_OF (x);
+ }
+ else
+ return scm_i_define_class_for_vtable (SCM_CLASS_OF (x));
+ default:
+ if (scm_is_pair (x))
+ return class_pair;
+ else
+ return class_unknown;
+ }
+
+ case scm_tc3_struct:
+ case scm_tc3_tc7_1:
+ case scm_tc3_tc7_2:
+ /* case scm_tc3_unused: */
+ /* Never reached */
+ break;
+ }
+ return class_unknown;
+}
+#undef FUNC_NAME
+
+
+\f
+
+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
+
+int
+scm_is_generic (SCM x)
+{
+ return SCM_INSTANCEP (x) && SCM_SUBCLASSP (SCM_CLASS_OF (x), class_generic);
+}
+
+int
+scm_is_method (SCM x)
+{
+ return SCM_INSTANCEP (x) && SCM_SUBCLASSP (SCM_CLASS_OF (x), class_method);
+}
+
+
+\f
+
+SCM
+scm_class_name (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_name), obj);
+}
+
+SCM
+scm_class_direct_supers (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_direct_supers), obj);
+}
+
+SCM
+scm_class_direct_slots (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_direct_slots), obj);
+}
+
+SCM
+scm_class_direct_subclasses (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_direct_subclasses), obj);
+}
+
+SCM
+scm_class_direct_methods (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_direct_methods), obj);
+}
+
+SCM
+scm_class_precedence_list (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_precedence_list), obj);
+}
+
+SCM
+scm_class_slots (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_class_slots), obj);
+}
+
+
+\f
+
+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
+scm_generic_function_methods (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_generic_function_methods), obj);
+}
+
+SCM
+scm_method_generic_function (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_method_generic_function), obj);
+}
+
+SCM
+scm_method_specializers (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_method_specializers), obj);
+}
+
+SCM
+scm_method_procedure (SCM obj)
+{
+ return scm_call_1 (scm_variable_ref (var_method_procedure), obj);
+}
+
+
+\f
+
+SCM
+scm_slot_ref (SCM obj, SCM slot_name)
+{
+ return scm_call_2 (scm_variable_ref (var_slot_ref), obj, slot_name);
+}
+
+SCM
+scm_slot_set_x (SCM obj, SCM slot_name, SCM value)
+{
+ return scm_call_3 (scm_variable_ref (var_slot_set_x), obj, slot_name, value);
+}
+
+SCM
+scm_slot_bound_p (SCM obj, SCM slot_name)
+{
+ return scm_call_2 (scm_variable_ref (var_slot_bound_p), obj, slot_name);
+}
+
+SCM
+scm_slot_exists_p (SCM obj, SCM slot_name)
+{
+ return scm_call_2 (scm_variable_ref (var_slot_exists_p), obj, slot_name);
+}
+
+
+\f
+
+SCM_DEFINE (scm_sys_clear_fields_x, "%clear-fields!", 2, 0, 0,
+ (SCM obj, SCM unbound),
+ "")
+#define FUNC_NAME s_scm_sys_clear_fields_x
+{
+ scm_t_signed_bits n, i;
+ SCM vtable, layout;
+
+ SCM_VALIDATE_STRUCT (1, obj);
+ vtable = SCM_STRUCT_VTABLE (obj);
+
+ n = SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size);
+ layout = SCM_VTABLE_LAYOUT (vtable);
+
+ /* Set all SCM-holding slots to the GOOPS unbound value. */
+ for (i = 0; i < n; i++)
+ if (scm_i_symbol_ref (layout, i*2) == 'p')
+ SCM_STRUCT_SLOT_SET (obj, i, unbound);
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+
+\f
+
+SCM_DEFINE (scm_sys_modify_instance, "%modify-instance", 2, 0, 0,
+ (SCM old, SCM new),
+ "Used by change-class to modify objects in place.")
+#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_t_bits word0, word1;
+ word0 = SCM_CELL_WORD_0 (old);
+ word1 = SCM_CELL_WORD_1 (old);
+ SCM_SET_CELL_WORD_0 (old, SCM_CELL_WORD_0 (new));
+ SCM_SET_CELL_WORD_1 (old, SCM_CELL_WORD_1 (new));
+ SCM_SET_CELL_WORD_0 (new, word0);
+ SCM_SET_CELL_WORD_1 (new, word1);
+ }
+ 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_t_bits word0, word1;
+ word0 = SCM_CELL_WORD_0 (old);
+ word1 = SCM_CELL_WORD_1 (old);
+ SCM_SET_CELL_WORD_0 (old, SCM_CELL_WORD_0 (new));
+ SCM_SET_CELL_WORD_1 (old, SCM_CELL_WORD_1 (new));
+ SCM_STRUCT_DATA (old)[scm_vtable_index_self] = SCM_UNPACK (old);
+ SCM_SET_CELL_WORD_0 (new, word0);
+ SCM_SET_CELL_WORD_1 (new, word1);
+ SCM_STRUCT_DATA (new)[scm_vtable_index_self] = SCM_UNPACK (new);
+ }
+ SCM_CRITICAL_SECTION_END;
+ 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*)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 obj = *(SCM*)o;
+ scm_lock_mutex (hell_mutex);
+ hell[burnin (obj)] = hell[--n_hell];
+ scm_unlock_mutex (hell_mutex);
+}
+
+
+static SCM
+purgatory (SCM obj, SCM new_class)
+{
+ return scm_call_2 (SCM_VARIABLE_REF (var_change_class), obj, new_class);
+}
+
+/* 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_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
+ scm_dynwind_rewind_handler (go_to_hell, &obj, SCM_F_WIND_EXPLICITLY);
+ scm_dynwind_unwind_handler (go_to_heaven, &obj, SCM_F_WIND_EXPLICITLY);
+ purgatory (obj, new_class);
+ scm_dynwind_end ();
+ }
+}
+
+
+\f
+
+/* Primitive generics: primitives that can dispatch to generics if their
+ arguments fail to apply. */
+
+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_PRIMITIVE_GENERIC_P (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_PRIMITIVE_GENERIC_P (subr), subr, SCM_ARGn, FUNC_NAME);
+ SCM_SET_SUBR_GENERIC (subr,
+ scm_make (scm_list_3 (class_generic,
+ k_name,
+ SCM_SUBR_NAME (subr))));
+ subrs = SCM_CDR (subrs);
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_primitive_generic_x, "set-primitive-generic!", 2, 0, 0,
+ (SCM subr, SCM generic),
+ "")
+#define FUNC_NAME s_scm_set_primitive_generic_x
+{
+ SCM_ASSERT (SCM_PRIMITIVE_GENERIC_P (subr), subr, SCM_ARG1, FUNC_NAME);
+ SCM_ASSERT (SCM_GENERICP (generic), generic, SCM_ARG2, FUNC_NAME);
+ SCM_SET_SUBR_GENERIC (subr, generic);
+ 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_PRIMITIVE_GENERIC_P (subr))
+ {
+ if (!SCM_UNPACK (*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
+
+SCM
+scm_wta_dispatch_0 (SCM gf, const char *subr)
+{
+ if (!SCM_UNPACK (gf))
+ scm_error_num_args_subr (subr);
+
+ return scm_call_0 (gf);
+}
+
+SCM
+scm_wta_dispatch_1 (SCM gf, SCM a1, int pos, const char *subr)
+{
+ if (!SCM_UNPACK (gf))
+ scm_wrong_type_arg (subr, pos, a1);
+
+ return scm_call_1 (gf, a1);
+}
+
+SCM
+scm_wta_dispatch_2 (SCM gf, SCM a1, SCM a2, int pos, const char *subr)
+{
+ if (!SCM_UNPACK (gf))
+ scm_wrong_type_arg (subr, pos, (pos == SCM_ARG1) ? a1 : a2);
+
+ return scm_call_2 (gf, a1, a2);
+}
+
+SCM
+scm_wta_dispatch_n (SCM gf, SCM args, int pos, const char *subr)
+{
+ if (!SCM_UNPACK (gf))
+ scm_wrong_type_arg (subr, pos, scm_list_ref (args, scm_from_int (pos)));
+
+ return scm_apply_0 (gf, args);
+}
+
+
+\f
+
+SCM
+scm_make (SCM args)
+{
+ return scm_apply_0 (scm_variable_ref (var_make), args);
+}
+
+
+\f
+
+/* SMOB, struct, and port classes. */
+
+static SCM
+make_class_name (const char *prefix, const char *type_name, const char *suffix)
+{
+ if (!type_name)
+ type_name = "";
+ return scm_string_to_symbol (scm_string_append
+ (scm_list_3 (scm_from_utf8_string (prefix),
+ scm_from_utf8_string (type_name),
+ scm_from_utf8_string (suffix))));
+}
+
+SCM
+scm_make_extended_class (char const *type_name, int applicablep)
+{
+ SCM name, meta, supers;
+
+ name = make_class_name ("<", type_name, ">");
+ meta = class_class;
+
+ if (applicablep)
+ supers = scm_list_1 (class_applicable);
+ else
+ supers = scm_list_1 (class_top);
+
+ return scm_make_standard_class (meta, name, supers, SCM_EOL);
+}
+
+void
+scm_i_inherit_applicable (SCM c)
+{
+ scm_call_1 (scm_variable_ref (var_inherit_applicable), c);
+}
+
+static void
+create_smob_classes (void)
+{
+ long i;
+
+ for (i = 0; i < SCM_I_MAX_SMOB_TYPE_COUNT; ++i)
+ scm_i_smob_class[i] = SCM_BOOL_F;
+
+ for (i = 0; i < scm_numsmob; ++i)
+ if (scm_is_false (scm_i_smob_class[i]))
+ scm_i_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 name, meta, super, supers;
+
+ meta = class_class;
+
+ name = make_class_name ("<", type_name, "-port>");
+ supers = scm_list_1 (class_port);
+ super = scm_make_standard_class (meta, name, supers, SCM_EOL);
+
+ name = make_class_name ("<", type_name, "-input-port>");
+ supers = scm_list_2 (super, class_input_port);
+ scm_i_port_class[SCM_IN_PCLASS_INDEX + ptobnum]
+ = scm_make_standard_class (meta, name, supers, SCM_EOL);
+
+ name = make_class_name ("<", type_name, "-output-port>");
+ supers = scm_list_2 (super, class_output_port);
+ scm_i_port_class[SCM_OUT_PCLASS_INDEX + ptobnum]
+ = scm_make_standard_class (meta, name, supers, SCM_EOL);
+
+ name = make_class_name ("<", type_name, "-input-output-port>");
+ supers = scm_list_2 (super, class_input_output_port);
+ scm_i_port_class[SCM_INOUT_PCLASS_INDEX + ptobnum]
+ = scm_make_standard_class (meta, name, supers, SCM_EOL);
+}
+
+static void
+create_port_classes (void)
+{
+ long i;
+
+ for (i = scm_c_num_port_types () - 1; i >= 0; i--)
+ scm_make_port_classes (i, SCM_PTOBNAME (i));
+}
+
+SCM
+scm_i_define_class_for_vtable (SCM vtable)
+{
+ SCM class;
+
+ scm_i_pthread_mutex_lock (&scm_i_misc_mutex);
+ if (scm_is_false (vtable_class_map))
+ vtable_class_map = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY);
+ scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
+
+ if (scm_is_false (scm_struct_vtable_p (vtable)))
+ abort ();
+
+ class = scm_weak_table_refq (vtable_class_map, vtable, SCM_BOOL_F);
+
+ if (scm_is_false (class))
+ {
+ if (SCM_UNPACK (class_class))
+ {
+ SCM name, meta, supers;
+
+ name = SCM_VTABLE_NAME (vtable);
+ if (scm_is_symbol (name))
+ name = scm_string_to_symbol
+ (scm_string_append
+ (scm_list_3 (scm_from_latin1_string ("<"),
+ scm_symbol_to_string (name),
+ scm_from_latin1_string (">"))));
+ else
+ name = scm_from_latin1_symbol ("<>");
+
+ if (SCM_STRUCT_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SETTER))
+ {
+ meta = class_applicable_struct_with_setter_class;
+ supers = scm_list_1 (class_applicable_struct_with_setter);
+ }
+ else if (SCM_STRUCT_VTABLE_FLAG_IS_SET (vtable,
+ SCM_VTABLE_FLAG_APPLICABLE))
+ {
+ meta = class_applicable_struct_class;
+ supers = scm_list_1 (class_applicable_struct);
+ }
+ else
+ {
+ meta = class_class;
+ supers = scm_list_1 (class_top);
+ }
+
+ return scm_make_standard_class (meta, name, supers, SCM_EOL);
+ }
+ else
+ /* `create_struct_classes' will fill this in later. */
+ class = SCM_BOOL_F;
+
+ /* Don't worry about races. This only happens when creating a
+ vtable, which happens by definition in one thread. */
+ scm_weak_table_putq_x (vtable_class_map, vtable, class);
+ }
+
+ return class;
+}
+
+static SCM
+make_struct_class (void *closure SCM_UNUSED,
+ SCM vtable, SCM data, SCM prev SCM_UNUSED)
+{
+ if (scm_is_false (data))
+ scm_i_define_class_for_vtable (vtable);
+ return SCM_UNSPECIFIED;
+}
+
+static void
+create_struct_classes (void)
+{
+ /* FIXME: take the vtable_class_map while initializing goops? */
+ scm_internal_hash_fold (make_struct_class, 0, SCM_BOOL_F,
+ vtable_class_map);
+}
+
+
+\f
+
+void
+scm_load_goops ()
+{
+ if (!goops_loaded_p)
+ scm_c_resolve_module ("oop goops");
+}
+
+SCM
+scm_ensure_accessor (SCM name)
+{
+ SCM var, gf;
+
+ var = scm_module_variable (scm_current_module (), name);
+ if (SCM_VARIABLEP (var) && !SCM_UNBNDP (SCM_VARIABLE_REF (var)))
+ gf = SCM_VARIABLE_REF (var);
+ else
+ gf = SCM_BOOL_F;
+
+ if (!SCM_IS_A_P (gf, class_accessor))
+ {
+ gf = scm_make (scm_list_3 (class_generic, k_name, name));
+ gf = scm_make (scm_list_5 (class_accessor,
+ k_name, name, k_setter, gf));
+ }
+
+ return gf;
+}
+
+
+\f
+
+SCM_DEFINE (scm_sys_goops_early_init, "%goops-early-init", 0, 0, 0,
+ (),
+ "")
+#define FUNC_NAME s_scm_sys_goops_early_init
+{
+ var_make_standard_class = scm_c_lookup ("make-standard-class");
+ var_make = scm_c_lookup ("make");
+ var_inherit_applicable = scm_c_lookup ("inherit-applicable!");
+
+ /* For SCM_SUBCLASSP. */
+ var_class_precedence_list = scm_c_lookup ("class-precedence-list");
+
+ var_slot_ref = scm_c_lookup ("slot-ref");
+ var_slot_set_x = scm_c_lookup ("slot-set!");
+ var_slot_bound_p = scm_c_lookup ("slot-bound?");
+ var_slot_exists_p = scm_c_lookup ("slot-exists?");
+
+ class_class = scm_variable_ref (scm_c_lookup ("<class>"));
+ class_top = scm_variable_ref (scm_c_lookup ("<top>"));
+ class_object = scm_variable_ref (scm_c_lookup ("<object>"));
+
+ class_foreign_slot = scm_variable_ref (scm_c_lookup ("<foreign-slot>"));
+ class_protected = scm_variable_ref (scm_c_lookup ("<protected-slot>"));
+ class_hidden = scm_variable_ref (scm_c_lookup ("<hidden-slot>"));
+ class_opaque = scm_variable_ref (scm_c_lookup ("<opaque-slot>"));
+ class_read_only = scm_variable_ref (scm_c_lookup ("<read-only-slot>"));
+ class_self = scm_variable_ref (scm_c_lookup ("<self-slot>"));
+ class_protected_opaque = scm_variable_ref (scm_c_lookup ("<protected-opaque-slot>"));
+ class_protected_hidden = scm_variable_ref (scm_c_lookup ("<protected-hidden-slot>"));
+ class_protected_read_only = scm_variable_ref (scm_c_lookup ("<protected-read-only-slot>"));
+ class_scm = scm_variable_ref (scm_c_lookup ("<scm-slot>"));
+ class_int = scm_variable_ref (scm_c_lookup ("<int-slot>"));
+ class_float = scm_variable_ref (scm_c_lookup ("<float-slot>"));
+ class_double = scm_variable_ref (scm_c_lookup ("<double-slot>"));
+
+ /* Applicables */
+ class_procedure_class = scm_variable_ref (scm_c_lookup ("<procedure-class>"));
+ class_applicable_struct_class = scm_variable_ref (scm_c_lookup ("<applicable-struct-class>"));
+ class_applicable_struct_with_setter_class =
+ scm_variable_ref (scm_c_lookup ("<applicable-struct-with-setter-class>"));
+
+ class_method = scm_variable_ref (scm_c_lookup ("<method>"));
+ class_accessor_method = scm_variable_ref (scm_c_lookup ("<accessor-method>"));
+ class_applicable = scm_variable_ref (scm_c_lookup ("<applicable>"));
+ class_applicable_struct = scm_variable_ref (scm_c_lookup ("<applicable-struct>"));
+ class_applicable_struct_with_setter = scm_variable_ref (scm_c_lookup ("<applicable-struct-with-setter>"));
+ class_generic = scm_variable_ref (scm_c_lookup ("<generic>"));
+ class_extended_generic = scm_variable_ref (scm_c_lookup ("<extended-generic>"));
+ class_generic_with_setter = scm_variable_ref (scm_c_lookup ("<generic-with-setter>"));
+ class_accessor = scm_variable_ref (scm_c_lookup ("<accessor>"));
+ class_extended_generic_with_setter = scm_variable_ref (scm_c_lookup ("<extended-generic-with-setter>"));
+ class_extended_accessor = scm_variable_ref (scm_c_lookup ("<extended-accessor>"));
+
+ /* Primitive types classes */
+ class_boolean = scm_variable_ref (scm_c_lookup ("<boolean>"));
+ class_char = scm_variable_ref (scm_c_lookup ("<char>"));
+ class_list = scm_variable_ref (scm_c_lookup ("<list>"));
+ class_pair = scm_variable_ref (scm_c_lookup ("<pair>"));
+ class_null = scm_variable_ref (scm_c_lookup ("<null>"));
+ class_string = scm_variable_ref (scm_c_lookup ("<string>"));
+ class_symbol = scm_variable_ref (scm_c_lookup ("<symbol>"));
+ class_vector = scm_variable_ref (scm_c_lookup ("<vector>"));
+ class_foreign = scm_variable_ref (scm_c_lookup ("<foreign>"));
+ class_hashtable = scm_variable_ref (scm_c_lookup ("<hashtable>"));
+ class_fluid = scm_variable_ref (scm_c_lookup ("<fluid>"));
+ class_dynamic_state = scm_variable_ref (scm_c_lookup ("<dynamic-state>"));
+ class_frame = scm_variable_ref (scm_c_lookup ("<frame>"));
+ class_keyword = scm_variable_ref (scm_c_lookup ("<keyword>"));
+ class_vm_cont = scm_variable_ref (scm_c_lookup ("<vm-continuation>"));
+ class_bytevector = scm_variable_ref (scm_c_lookup ("<bytevector>"));
+ class_uvec = scm_variable_ref (scm_c_lookup ("<uvec>"));
+ class_array = scm_variable_ref (scm_c_lookup ("<array>"));
+ class_bitvector = scm_variable_ref (scm_c_lookup ("<bitvector>"));
+ class_number = scm_variable_ref (scm_c_lookup ("<number>"));
+ class_complex = scm_variable_ref (scm_c_lookup ("<complex>"));
+ class_real = scm_variable_ref (scm_c_lookup ("<real>"));
+ class_integer = scm_variable_ref (scm_c_lookup ("<integer>"));
+ class_fraction = scm_variable_ref (scm_c_lookup ("<fraction>"));
+ class_keyword = scm_variable_ref (scm_c_lookup ("<keyword>"));
+ class_unknown = scm_variable_ref (scm_c_lookup ("<unknown>"));
+ class_procedure = scm_variable_ref (scm_c_lookup ("<procedure>"));
+ class_primitive_generic = scm_variable_ref (scm_c_lookup ("<primitive-generic>"));
+ class_port = scm_variable_ref (scm_c_lookup ("<port>"));
+ class_input_port = scm_variable_ref (scm_c_lookup ("<input-port>"));
+ class_output_port = scm_variable_ref (scm_c_lookup ("<output-port>"));
+ class_input_output_port = scm_variable_ref (scm_c_lookup ("<input-output-port>"));
+
+ create_smob_classes ();
+ create_struct_classes ();
+ create_port_classes ();
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+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_class_name = scm_c_lookup ("class-name");
+ var_class_direct_supers = scm_c_lookup ("class-direct-supers");
+ var_class_direct_slots = scm_c_lookup ("class-direct-slots");
+ var_class_direct_subclasses = scm_c_lookup ("class-direct-subclasses");
+ var_class_direct_methods = scm_c_lookup ("class-direct-methods");
+ var_class_slots = scm_c_lookup ("class-slots");
+
+ var_generic_function_methods = scm_c_lookup ("generic-function-methods");
+ var_method_generic_function = scm_c_lookup ("method-generic-function");
+ var_method_specializers = scm_c_lookup ("method-specializers");
+ var_method_procedure = scm_c_lookup ("method-procedure");
+
+ var_change_class = scm_c_lookup ("change-class");
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+ scm_init_deprecated_goops ();
+#endif
+
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+static void
+scm_init_goops_builtins (void *unused)
+{
+ scm_module_goops = scm_current_module ();
+
+ hell = scm_calloc (hell_size * sizeof (*hell));
+ hell_mutex = scm_make_mutex ();
+
+#include "libguile/goops.x"
+
+ scm_c_define ("vtable-flag-vtable",
+ scm_from_int (SCM_VTABLE_FLAG_VTABLE));
+ scm_c_define ("vtable-flag-applicable-vtable",
+ scm_from_int (SCM_VTABLE_FLAG_APPLICABLE_VTABLE));
+ scm_c_define ("vtable-flag-setter-vtable",
+ scm_from_int (SCM_VTABLE_FLAG_SETTER_VTABLE));
+ scm_c_define ("vtable-flag-validated",
+ scm_from_int (SCM_VTABLE_FLAG_VALIDATED));
+ scm_c_define ("vtable-flag-goops-class",
+ scm_from_int (SCM_VTABLE_FLAG_GOOPS_CLASS));
+ scm_c_define ("vtable-flag-goops-valid",
+ scm_from_int (SCM_VTABLE_FLAG_GOOPS_VALID));
+ scm_c_define ("vtable-flag-goops-slot",
+ scm_from_int (SCM_VTABLE_FLAG_GOOPS_SLOT));
+ scm_c_define ("vtable-flag-goops-static",
+ scm_from_int (SCM_VTABLE_FLAG_GOOPS_STATIC));
+}
+
+void
+scm_init_goops ()
+{
+ scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
+ "scm_init_goops_builtins", scm_init_goops_builtins,
+ NULL);
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff