-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice. */
-\f
-
-/* This file and objects.h contains those minimal pieces of the Guile
- * Object Oriented Programming System which need to be included in
- * libguile. See the comments in objects.h.
- */
-
-#include "_scm.h"
-
-#include "struct.h"
-#include "procprop.h"
-#include "chars.h"
-#include "keywords.h"
-#include "smob.h"
-
-#include "objects.h"
-\f
-
-SCM scm_metaclass_standard;
-SCM scm_metaclass_operator;
-
-/* These variables are filled in by the object system when loaded. */
-SCM scm_class_boolean, scm_class_char, scm_class_pair;
-SCM scm_class_procedure, scm_class_string, scm_class_symbol;
-SCM scm_class_procedure_with_setter;
-SCM scm_class_vector, scm_class_null;
-SCM scm_class_integer, scm_class_real, scm_class_complex;
-SCM scm_class_unknown;
-
-SCM *scm_port_class = 0;
-SCM *scm_smob_class = 0;
-
-SCM scm_apply_generic_env;
-
-SCM (*scm_make_extended_class) (char *type_name);
-void (*scm_make_port_classes) (int ptobnum, char *type_name);
-void (*scm_change_object_class) (SCM, SCM, SCM);
-
-/* This function is used for efficient type dispatch. */
-SCM
-scm_class_of (SCM x)
-{
- switch (SCM_ITAG3 (x))
- {
- case scm_tc3_int_1:
- case scm_tc3_int_2:
- return scm_class_integer;
-
- case scm_tc3_imm24:
- if (SCM_ICHRP (x))
- return scm_class_char;
- else
- {
- switch (SCM_ISYMNUM (x))
- {
- case SCM_ISYMNUM (SCM_BOOL_F):
- case SCM_ISYMNUM (SCM_BOOL_T):
- return scm_class_boolean;
- case SCM_ISYMNUM (SCM_EOL):
- return scm_class_null;
- default:
- return scm_class_unknown;
- }
- }
-
- case scm_tc3_cons:
- switch (SCM_TYP7 (x))
- {
- case scm_tcs_cons_nimcar:
- return scm_class_pair;
- case scm_tcs_closures:
- return scm_class_procedure;
- case scm_tcs_symbols:
- return scm_class_symbol;
- case scm_tc7_vector:
- case scm_tc7_wvect:
- case scm_tc7_bvect:
- case scm_tc7_byvect:
- case scm_tc7_svect:
- case scm_tc7_ivect:
- case scm_tc7_uvect:
- case scm_tc7_fvect:
- case scm_tc7_dvect:
- case scm_tc7_cvect:
- return scm_class_vector;
- case scm_tc7_string:
- case scm_tc7_substring:
- return scm_class_string;
- case scm_tc7_asubr:
- case scm_tc7_subr_0:
- case scm_tc7_subr_1:
- case scm_tc7_cxr:
- case scm_tc7_subr_3:
- case scm_tc7_subr_2:
- case scm_tc7_rpsubr:
- case scm_tc7_subr_1o:
- case scm_tc7_subr_2o:
- case scm_tc7_lsubr_2:
- case scm_tc7_lsubr:
- case scm_tc7_cclo:
- return scm_class_procedure;
- case scm_tc7_pws:
- return scm_class_procedure_with_setter;
-
- case scm_tc7_port:
- return scm_port_class[(SCM_WRTNG & SCM_CAR (x)
- ? (SCM_RDNG & SCM_CAR (x)
- ? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x)
- : SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x))
- : SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))];
- case scm_tc7_smob:
- {
- SCM type = SCM_TYP16 (x);
- if (type == scm_tc16_flo)
- {
- if (SCM_CAR (x) & SCM_IMAG_PART)
- return scm_class_complex;
- else
- return scm_class_real;
- }
- else
- return scm_smob_class[SCM_TC2SMOBNUM (type)];
- }
- case scm_tcs_cons_gloc:
- /* must be a struct */
- if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID)
- return SCM_CLASS_OF (x);
- else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
- {
- /* Goops object */
- if (SCM_OBJ_CLASS_REDEF (x) != SCM_BOOL_F)
- scm_change_object_class (x,
- SCM_CLASS_OF (x), /* old */
- SCM_OBJ_CLASS_REDEF (x)); /* new */
- return SCM_CLASS_OF (x);
- }
- else
- {
- /* ordinary struct */
- SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x));
- if (SCM_NFALSEP (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle))))
- return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle));
- else
- {
- SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle));
- SCM class = scm_make_extended_class (SCM_NFALSEP (name)
- ? SCM_ROCHARS (name)
- : 0);
- SCM_SET_STRUCT_TABLE_CLASS (handle, class);
- return class;
- }
- }
- default:
- if (SCM_CONSP (x))
- return scm_class_pair;
- else
- return scm_class_unknown;
- }
-
- case scm_tc3_cons_gloc:
- case scm_tc3_tc7_1:
- case scm_tc3_tc7_2:
- case scm_tc3_closure:
- /* Never reached */
- break;
- }
- return scm_class_unknown;
-}
-
-SCM_PROC (s_entity_p, "entity?", 1, 0, 0, scm_entity_p);
-
-SCM
-scm_entity_p (SCM obj)
-{
- return (SCM_NIMP (obj) && SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj)
- ? SCM_BOOL_T
- : SCM_BOOL_F);
-}
-
-SCM_PROC (s_operator_p, "operator?", 1, 0, 0, scm_operator_p);
-
-SCM
-scm_operator_p (SCM obj)
-{
- return (SCM_NIMP (obj)
- && SCM_STRUCTP (obj)
- && SCM_I_OPERATORP (obj)
- && !SCM_I_ENTITYP (obj)
- ? SCM_BOOL_T
- : SCM_BOOL_F);
-}
-
-SCM_PROC (s_set_object_procedure_x, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x);
-
-SCM_SYMBOL (scm_sym_atdispatch, "@dispatch");
-
-SCM
-scm_set_object_procedure_x (SCM obj, SCM procs)
-{
- SCM proc[4], *pp, p, setp, arity;
- int i, a, r, c = 0;
- SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj)
- && (SCM_I_ENTITYP (obj)
- || (SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)),
- obj,
- SCM_ARG1,
- s_set_object_procedure_x);
- for (i = 0; i < 4; ++i)
- proc[i] = SCM_BOOL_F;
- i = 0;
- if (SCM_OBJ_CLASS_FLAGS (obj) & SCM_CLASSF_PURE_GENERIC)
- c = 1;
- while (SCM_NIMP (procs))
- {
- if (i == 4)
- scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x));
- p = SCM_CAR (procs);
- setp = 0;
- SCM_ASSERT (SCM_NIMP (p), p, SCM_ARG2 + i, s_set_object_procedure_x);
- if (c != 0)
- {
- if ((SCM_CAR (p) == scm_sym_atdispatch
- || SCM_CAR (p) == SCM_IM_DISPATCH)
- && c < 4)
- {
- proc[c++] = setp = p;
- goto next;
- }
- else
- SCM_ASSERT (SCM_TYP7 (p) == scm_tc7_subr_1
- || (SCM_CLOSUREP (p)
- && (SCM_INUM (SCM_CAR (scm_procedure_property
- (p, scm_sym_arity)))
- == 1)),
- p, SCM_ARG2 + i, s_set_object_procedure_x);
- }
- if (SCM_CLOSUREP (p))
- {
- arity = scm_procedure_property (p, scm_sym_arity);
- a = SCM_INUM (SCM_CAR (arity));
- /* Closures have zero optional args */
- r = SCM_NFALSEP (SCM_CADDR (arity));
- if (a == 1 || (a <= 1 && r))
- {
- if (SCM_NFALSEP (proc[0]))
- goto ambiguous;
- proc[0] = setp = p;
- }
- if (a == 2 || (a <= 2 && r))
- {
- if (SCM_NFALSEP (proc[1]))
- goto ambiguous;
- proc[1] = setp = p;
- }
- if (a == 3 || (a <= 3 && r))
- {
- if (SCM_NFALSEP (proc[2]))
- goto ambiguous;
- proc[2] = setp = p;
- }
- if (a <= 4 && r)
- {
- if (SCM_NFALSEP (proc[3]))
- goto ambiguous;
- proc[3] = setp = p;
- }
- }
- else if (SCM_TYP7 (p) == scm_tc7_subr_1)
- {
- if (SCM_NFALSEP (proc[0]))
- goto ambiguous;
- proc[0] = setp = p;
- }
- else if (SCM_TYP7 (p) == scm_tc7_subr_2)
- {
- if (SCM_NFALSEP (proc[1]))
- goto ambiguous;
- proc[1] = setp = p;
- }
- else if (SCM_TYP7 (p) == scm_tc7_subr_3)
- {
- if (SCM_NFALSEP (proc[2]))
- goto ambiguous;
- proc[2] = setp = p;
- }
- else if (SCM_TYP7 (p) == scm_tc7_lsubr_2)
- {
- if (SCM_NFALSEP (proc[3]))
- {
- ambiguous:
- SCM_ASSERT (0, p, "Ambiguous procedure arities",
- s_set_object_procedure_x);
- }
- proc[3] = setp = p;
- }
- SCM_ASSERT (setp, p, SCM_ARG2 + i, s_set_object_procedure_x);
- next:
- ++i;
- procs = SCM_CDR (procs);
- }
- /* Fill the rest of the method cache slots
- if a cache has been supplied earlier. */
- if (c != 0)
- for (; c < 4; ++c)
- proc[c] = proc[c - 1];
-
- pp = (SCM_I_ENTITYP (obj)
- ? &SCM_ENTITY_PROC_0 (obj)
- : &SCM_OPERATOR_CLASS (obj)->proc0);
- for (i = 0; i < 4; ++i)
- *pp++ = proc[i];
-
- return SCM_UNSPECIFIED;
-}
-
-#ifdef GUILE_DEBUG
-SCM_PROC (s_object_procedures, "object-procedures", 1, 0, 0, scm_object_procedures);
-
-SCM
-scm_object_procedures (SCM obj)
-{
- SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj) && SCM_I_OPERATORP (obj),
- obj, SCM_ARG1, s_object_procedures);
- return (SCM_I_ENTITYP (obj)
- ? SCM_LIST4 (SCM_ENTITY_PROC_0 (obj),
- SCM_ENTITY_PROC_1 (obj),
- SCM_ENTITY_PROC_2 (obj),
- SCM_ENTITY_PROC_3 (obj))
- : SCM_LIST4 (SCM_OPERATOR_PROC_0 (obj),
- SCM_OPERATOR_PROC_1 (obj),
- SCM_OPERATOR_PROC_2 (obj),
- SCM_OPERATOR_PROC_3 (obj)));
-}
-#endif /* GUILE_DEBUG */
-
-/* The following procedures are not a part of Goops but a minimal
- * object system built upon structs. They are here for those who
- * want to implement their own object system.
- */
-
-SCM
-scm_i_make_class_object (SCM meta,
- SCM layout_string,
- unsigned long flags)
-{
- SCM c;
- SCM layout = scm_make_struct_layout (layout_string);
- c = scm_make_struct (meta,
- SCM_INUM0,
- SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
- SCM_SET_CLASS_FLAGS (c, flags);
- return c;
-}
-
-SCM_PROC (s_make_class_object, "make-class-object", 2, 0, 0, scm_make_class_object);
-
-SCM
-scm_make_class_object (SCM metaclass, SCM layout)
-{
- unsigned long flags = 0;
- SCM_ASSERT (SCM_NIMP (metaclass) && SCM_STRUCTP (metaclass),
- metaclass, SCM_ARG1, s_make_class_object);
- SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout),
- layout, SCM_ARG2, s_make_class_object);
- if (metaclass == scm_metaclass_operator)
- flags = SCM_CLASSF_OPERATOR;
- return scm_i_make_class_object (metaclass, layout, flags);
-}
-
-SCM_PROC (s_make_subclass_object, "make-subclass-object", 2, 0, 0, scm_make_subclass_object);
-
-SCM
-scm_make_subclass_object (SCM class, SCM layout)
-{
- SCM pl;
- SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class),
- class,
- SCM_ARG1,
- s_make_subclass_object);
- SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout),
- layout,
- SCM_ARG2,
- s_make_subclass_object);
- pl = SCM_STRUCT_DATA (class)[scm_vtable_index_layout];
- /* Convert symbol->string */
- pl = scm_makfromstr (SCM_CHARS (pl), (scm_sizet) SCM_LENGTH (pl), 0);
- return scm_i_make_class_object (SCM_STRUCT_VTABLE (class),
- scm_string_append (SCM_LIST2 (pl, layout)),
- SCM_CLASS_FLAGS (class));
-}
-
-void
-scm_init_objects ()
-{
- SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT);
- SCM ml = scm_make_struct_layout (ms);
- SCM mt = scm_make_vtable_vtable (ml, SCM_INUM0,
- SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
-
- SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT);
- SCM ol = scm_make_struct_layout (os);
- SCM ot = scm_make_vtable_vtable (ol, SCM_INUM0,
- SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
-
- SCM es = scm_makfrom0str (SCM_ENTITY_LAYOUT);
- SCM el = scm_make_struct_layout (es);
- SCM et = scm_make_struct (mt, SCM_INUM0,
- SCM_LIST4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
-
- scm_sysintern ("<class>", mt);
- scm_metaclass_standard = mt;
- scm_sysintern ("<operator-class>", ot);
- scm_metaclass_operator = ot;
- SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
- SCM_SET_CLASS_DESTRUCTOR (et, scm_struct_free_entity);
- scm_sysintern ("<entity>", et);
-
-#include "objects.x"
-}
+/* Copyright (C) 1995,1996,1999,2000,2001, 2003, 2004, 2006, 2008 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 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 file and objects.h contains those minimal pieces of the Guile
+ * Object Oriented Programming System which need to be included in
+ * libguile. See the comments in objects.h.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+
+#include "libguile/struct.h"
+#include "libguile/procprop.h"
+#include "libguile/chars.h"
+#include "libguile/keywords.h"
+#include "libguile/smob.h"
+#include "libguile/eval.h"
+#include "libguile/alist.h"
+#include "libguile/ports.h"
+#include "libguile/strings.h"
+#include "libguile/vectors.h"
+
+#include "libguile/validate.h"
+#include "libguile/objects.h"
+#include "libguile/goops.h"
+
+\f
+
+SCM scm_metaclass_standard;
+SCM scm_metaclass_operator;
+
+/* The cache argument for scm_mcache_lookup_cmethod has one of two possible
+ * formats:
+ *
+ * Format #1:
+ * (SCM_IM_DISPATCH ARGS N-SPECIALIZED
+ * #((TYPE1 ... ENV FORMALS FORM ...) ...)
+ * GF)
+ *
+ * Format #2:
+ * (SCM_IM_HASH_DISPATCH ARGS N-SPECIALIZED HASHSET MASK
+ * #((TYPE1 ... ENV FORMALS FORM ...) ...)
+ * GF)
+ *
+ * ARGS is either a list of expressions, in which case they
+ * are interpreted as the arguments of an application, or
+ * a non-pair, which is interpreted as a single expression
+ * yielding all arguments.
+ *
+ * SCM_IM_DISPATCH expressions in generic functions always
+ * have ARGS = the symbol `args' or the iloc #@0-0.
+ *
+ * Need FORMALS in order to support varying arity. This
+ * also avoids the need for renaming of bindings.
+ *
+ * We should probably not complicate this mechanism by
+ * introducing "optimizations" for getters and setters or
+ * primitive methods. Getters and setter will normally be
+ * compiled into @slot-[ref|set!] or a procedure call.
+ * They rely on the dispatch performed before executing
+ * the code which contains them.
+ *
+ * We might want to use a more efficient representation of
+ * this form in the future, perhaps after we have introduced
+ * low-level support for syntax-case macros.
+ */
+
+SCM
+scm_mcache_lookup_cmethod (SCM cache, SCM args)
+{
+ unsigned long i, mask, n, end;
+ SCM ls, methods, z = SCM_CDDR (cache);
+ n = scm_to_ulong (SCM_CAR (z)); /* maximum number of specializers */
+ methods = SCM_CADR (z);
+
+ if (scm_is_simple_vector (methods))
+ {
+ /* cache format #1: prepare for linear search */
+ mask = -1;
+ i = 0;
+ end = SCM_SIMPLE_VECTOR_LENGTH (methods);
+ }
+ else
+ {
+ /* cache format #2: compute a hash value */
+ unsigned long hashset = scm_to_ulong (methods);
+ long j = n;
+ z = SCM_CDDR (z);
+ mask = scm_to_ulong (SCM_CAR (z));
+ methods = SCM_CADR (z);
+ i = 0;
+ ls = args;
+ if (!scm_is_null (ls))
+ do
+ {
+ i += SCM_STRUCT_DATA (scm_class_of (SCM_CAR (ls)))
+ [scm_si_hashsets + hashset];
+ ls = SCM_CDR (ls);
+ }
+ while (j-- && !scm_is_null (ls));
+ i &= mask;
+ end = i;
+ }
+
+ /* Search for match */
+ do
+ {
+ long j = n;
+ z = SCM_SIMPLE_VECTOR_REF (methods, i);
+ ls = args; /* list of arguments */
+ if (!scm_is_null (ls))
+ do
+ {
+ /* More arguments than specifiers => CLASS != ENV */
+ if (! scm_is_eq (scm_class_of (SCM_CAR (ls)), SCM_CAR (z)))
+ goto next_method;
+ ls = SCM_CDR (ls);
+ z = SCM_CDR (z);
+ }
+ while (j-- && !scm_is_null (ls));
+ /* Fewer arguments than specifiers => CAR != ENV */
+ if (scm_is_null (SCM_CAR (z)) || scm_is_pair (SCM_CAR (z)))
+ return z;
+ next_method:
+ i = (i + 1) & mask;
+ } while (i != end);
+ return SCM_BOOL_F;
+}
+
+SCM
+scm_mcache_compute_cmethod (SCM cache, SCM args)
+{
+ SCM cmethod = scm_mcache_lookup_cmethod (cache, args);
+ if (scm_is_false (cmethod))
+ /* No match - memoize */
+ return scm_memoize_method (cache, args);
+ return cmethod;
+}
+
+SCM
+scm_apply_generic (SCM gf, SCM args)
+{
+ SCM cmethod = scm_mcache_compute_cmethod (SCM_ENTITY_PROCEDURE (gf), args);
+ return scm_eval_body (SCM_CDR (SCM_CMETHOD_CODE (cmethod)),
+ SCM_EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (cmethod)),
+ args,
+ SCM_CMETHOD_ENV (cmethod)));
+}
+
+SCM
+scm_call_generic_0 (SCM gf)
+{
+ return scm_apply_generic (gf, SCM_EOL);
+}
+
+SCM
+scm_call_generic_1 (SCM gf, SCM a1)
+{
+ return scm_apply_generic (gf, scm_list_1 (a1));
+}
+
+SCM
+scm_call_generic_2 (SCM gf, SCM a1, SCM a2)
+{
+ return scm_apply_generic (gf, scm_list_2 (a1, a2));
+}
+
+SCM
+scm_call_generic_3 (SCM gf, SCM a1, SCM a2, SCM a3)
+{
+ return scm_apply_generic (gf, scm_list_3 (a1, a2, a3));
+}
+
+SCM_DEFINE (scm_entity_p, "entity?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is an entity.")
+#define FUNC_NAME s_scm_entity_p
+{
+ return scm_from_bool(SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_operator_p, "operator?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is an operator.")
+#define FUNC_NAME s_scm_operator_p
+{
+ return scm_from_bool(SCM_STRUCTP (obj)
+ && SCM_I_OPERATORP (obj)
+ && !SCM_I_ENTITYP (obj));
+}
+#undef FUNC_NAME
+
+/* XXX - What code requires the object procedure to be only of certain
+ types? */
+
+SCM_DEFINE (scm_valid_object_procedure_p, "valid-object-procedure?", 1, 0, 0,
+ (SCM proc),
+ "Return @code{#t} iff @var{proc} is a procedure that can be used "
+ "with @code{set-object-procedure}. It is always valid to use "
+ "a closure constructed by @code{lambda}.")
+#define FUNC_NAME s_scm_valid_object_procedure_p
+{
+ if (SCM_IMP (proc))
+ return SCM_BOOL_F;
+ switch (SCM_TYP7 (proc))
+ {
+ default:
+ return SCM_BOOL_F;
+ case scm_tcs_closures:
+ case scm_tc7_subr_1:
+ case scm_tc7_subr_2:
+ case scm_tc7_subr_3:
+ case scm_tc7_lsubr_2:
+ return SCM_BOOL_T;
+ }
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_object_procedure_x, "set-object-procedure!", 2, 0, 0,
+ (SCM obj, SCM proc),
+ "Set the object procedure of @var{obj} to @var{proc}.\n"
+ "@var{obj} must be either an entity or an operator.")
+#define FUNC_NAME s_scm_set_object_procedure_x
+{
+ SCM_ASSERT (SCM_STRUCTP (obj)
+ && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
+ || (SCM_I_ENTITYP (obj)
+ && !(SCM_OBJ_CLASS_FLAGS (obj)
+ & SCM_CLASSF_PURE_GENERIC))),
+ obj,
+ SCM_ARG1,
+ FUNC_NAME);
+ SCM_ASSERT (scm_valid_object_procedure_p (proc), proc, SCM_ARG2, FUNC_NAME);
+ if (SCM_I_ENTITYP (obj))
+ SCM_SET_ENTITY_PROCEDURE (obj, proc);
+ else
+ SCM_OPERATOR_CLASS (obj)->procedure = proc;
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+#ifdef GUILE_DEBUG
+SCM_DEFINE (scm_object_procedure, "object-procedure", 1, 0, 0,
+ (SCM obj),
+ "Return the object procedure of @var{obj}. @var{obj} must be\n"
+ "an entity or an operator.")
+#define FUNC_NAME s_scm_object_procedure
+{
+ SCM_ASSERT (SCM_STRUCTP (obj)
+ && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
+ || SCM_I_ENTITYP (obj)),
+ obj, SCM_ARG1, FUNC_NAME);
+ return (SCM_I_ENTITYP (obj)
+ ? SCM_ENTITY_PROCEDURE (obj)
+ : SCM_OPERATOR_CLASS (obj)->procedure);
+}
+#undef FUNC_NAME
+#endif /* GUILE_DEBUG */
+
+/* The following procedures are not a part of Goops but a minimal
+ * object system built upon structs. They are here for those who
+ * want to implement their own object system.
+ */
+
+SCM
+scm_i_make_class_object (SCM meta,
+ SCM layout_string,
+ unsigned long flags)
+{
+ SCM c;
+ SCM layout = scm_make_struct_layout (layout_string);
+ c = scm_make_struct (meta,
+ SCM_INUM0,
+ scm_list_4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
+ SCM_SET_CLASS_FLAGS (c, flags);
+ return c;
+}
+
+SCM_DEFINE (scm_make_class_object, "make-class-object", 2, 0, 0,
+ (SCM metaclass, SCM layout),
+ "Create a new class object of class @var{metaclass}, with the\n"
+ "slot layout specified by @var{layout}.")
+#define FUNC_NAME s_scm_make_class_object
+{
+ unsigned long flags = 0;
+ SCM_VALIDATE_STRUCT (1, metaclass);
+ SCM_VALIDATE_STRING (2, layout);
+ if (scm_is_eq (metaclass, scm_metaclass_operator))
+ flags = SCM_CLASSF_OPERATOR;
+ return scm_i_make_class_object (metaclass, layout, flags);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_make_subclass_object, "make-subclass-object", 2, 0, 0,
+ (SCM class, SCM layout),
+ "Create a subclass object of @var{class}, with the slot layout\n"
+ "specified by @var{layout}.")
+#define FUNC_NAME s_scm_make_subclass_object
+{
+ SCM pl;
+ SCM_VALIDATE_STRUCT (1, class);
+ SCM_VALIDATE_STRING (2, layout);
+ pl = SCM_PACK (SCM_STRUCT_DATA (class) [scm_vtable_index_layout]);
+ pl = scm_symbol_to_string (pl);
+ return scm_i_make_class_object (SCM_STRUCT_VTABLE (class),
+ scm_string_append (scm_list_2 (pl, layout)),
+ SCM_CLASS_FLAGS (class));
+}
+#undef FUNC_NAME
+
+void
+scm_init_objects ()
+{
+ SCM ms = scm_from_locale_string (SCM_METACLASS_STANDARD_LAYOUT);
+ SCM mt = scm_make_vtable_vtable (ms, SCM_INUM0,
+ scm_list_3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
+
+ SCM os = scm_from_locale_string (SCM_METACLASS_OPERATOR_LAYOUT);
+ SCM ot = scm_make_vtable_vtable (os, SCM_INUM0,
+ scm_list_3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
+
+ SCM es = scm_from_locale_string (SCM_ENTITY_LAYOUT);
+ SCM el = scm_make_struct_layout (es);
+ SCM et = scm_make_struct (mt, SCM_INUM0,
+ scm_list_4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
+
+ scm_c_define ("<class>", mt);
+ scm_metaclass_standard = mt;
+ scm_c_define ("<operator-class>", ot);
+ scm_metaclass_operator = ot;
+ SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
+ scm_c_define ("<entity>", et);
+
+#include "libguile/objects.x"
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff