mirror of
https://git.savannah.gnu.org/git/guile.git
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1742 lines
51 KiB
C
1742 lines
51 KiB
C
/* Copyright (C) 1998,1999,2000,2001,2002,2003,2004,2008,2009,2010,2011,2012,2013,2014,2015
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* Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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/* This software is a derivative work of other copyrighted softwares; the
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* copyright notices of these softwares are placed in the file COPYRIGHTS
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*
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* This file is based upon stklos.c from the STk distribution by
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* Erick Gallesio <eg@unice.fr>.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include "libguile/_scm.h"
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#include "libguile/alist.h"
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#include "libguile/async.h"
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#include "libguile/chars.h"
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#include "libguile/debug.h"
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#include "libguile/dynl.h"
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#include "libguile/dynwind.h"
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#include "libguile/eval.h"
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#include "libguile/gsubr.h"
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#include "libguile/hashtab.h"
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#include "libguile/keywords.h"
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#include "libguile/macros.h"
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#include "libguile/modules.h"
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#include "libguile/ports.h"
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#include "libguile/procprop.h"
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#include "libguile/programs.h"
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#include "libguile/random.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/strings.h"
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#include "libguile/strports.h"
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#include "libguile/vectors.h"
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#include "libguile/vm.h"
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#include "libguile/validate.h"
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#include "libguile/goops.h"
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/* Port classes */
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#define SCM_IN_PCLASS_INDEX 0
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#define SCM_OUT_PCLASS_INDEX SCM_I_MAX_PORT_TYPE_COUNT
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#define SCM_INOUT_PCLASS_INDEX (2 * SCM_I_MAX_PORT_TYPE_COUNT)
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/* Objects have identity, so references to classes and instances are by
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value, not by reference. Redefinition of a class or modification of
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an instance causes in-place update; you can think of GOOPS as
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building in its own indirection, and for that reason referring to
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GOOPS values by variable reference is unnecessary.
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References to ordinary procedures is by reference (by variable),
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though, as in the rest of Guile. */
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static SCM var_make_standard_class = SCM_BOOL_F;
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static SCM var_slot_unbound = SCM_BOOL_F;
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static SCM var_slot_missing = SCM_BOOL_F;
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static SCM var_change_class = SCM_BOOL_F;
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static SCM var_make = SCM_BOOL_F;
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SCM_SYMBOL (sym_slot_unbound, "slot-unbound");
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SCM_SYMBOL (sym_slot_missing, "slot-missing");
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SCM_SYMBOL (sym_change_class, "change-class");
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SCM_VARIABLE (scm_var_make_extended_generic, "make-extended-generic");
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/* Class redefinition protocol:
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A class is represented by a heap header h1 which points to a
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malloc:ed memory block m1.
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When a new version of a class is created, a new header h2 and
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memory block m2 are allocated. The headers h1 and h2 then switch
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pointers so that h1 refers to m2 and h2 to m1. In this way, names
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bound to h1 will point to the new class at the same time as h2 will
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be a handle which the GC will use to free m1.
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The `redefined' slot of m1 will be set to point to h1. An old
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instance will have its class pointer (the CAR of the heap header)
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pointing to m1. The non-immediate `redefined'-slot in m1 indicates
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the class modification and the new class pointer can be found via
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h1.
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*/
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#define TEST_CHANGE_CLASS(obj, class) \
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{ \
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class = SCM_CLASS_OF (obj); \
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if (scm_is_true (SCM_OBJ_CLASS_REDEF (obj))) \
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{ \
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scm_change_object_class (obj, class, SCM_OBJ_CLASS_REDEF (obj));\
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class = SCM_CLASS_OF (obj); \
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} \
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}
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#define SCM_GOOPS_UNBOUND SCM_UNBOUND
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#define SCM_GOOPS_UNBOUNDP(x) (scm_is_eq (x, SCM_GOOPS_UNBOUND))
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static int goops_loaded_p = 0;
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static scm_t_rstate *goops_rstate;
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/* These variables are filled in by the object system when loaded. */
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static SCM class_boolean, class_char, class_pair;
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static SCM class_procedure, class_string, class_symbol;
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static SCM class_primitive_generic;
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static SCM class_vector, class_null;
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static SCM class_integer, class_real, class_complex, class_fraction;
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static SCM class_unknown;
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static SCM class_top, class_object, class_class;
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static SCM class_applicable;
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static SCM class_applicable_struct, class_applicable_struct_with_setter;
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static SCM class_generic, class_generic_with_setter;
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static SCM class_accessor;
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static SCM class_extended_generic, class_extended_generic_with_setter;
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static SCM class_extended_accessor;
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static SCM class_method;
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static SCM class_accessor_method;
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static SCM class_procedure_class;
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static SCM class_applicable_struct_class;
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static SCM class_applicable_struct_with_setter_class;
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static SCM class_number, class_list;
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static SCM class_keyword;
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static SCM class_port, class_input_output_port;
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static SCM class_input_port, class_output_port;
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static SCM class_foreign_slot;
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static SCM class_self, class_protected;
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static SCM class_hidden, class_opaque, class_read_only;
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static SCM class_protected_hidden, class_protected_opaque, class_protected_read_only;
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static SCM class_scm;
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static SCM class_int, class_float, class_double;
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static SCM class_foreign;
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static SCM class_hashtable;
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static SCM class_fluid;
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static SCM class_dynamic_state;
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static SCM class_frame;
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static SCM class_vm_cont;
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static SCM class_bytevector;
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static SCM class_uvec;
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static SCM class_array;
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static SCM class_bitvector;
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static SCM vtable_class_map = SCM_BOOL_F;
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/* Port classes. Allocate 3 times the maximum number of port types so that
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input ports, output ports, and in/out ports can be stored at different
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offsets. See `SCM_IN_PCLASS_INDEX' et al. */
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SCM scm_i_port_class[3 * SCM_I_MAX_PORT_TYPE_COUNT];
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/* SMOB classes. */
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SCM scm_i_smob_class[SCM_I_MAX_SMOB_TYPE_COUNT];
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static SCM scm_make_unbound (void);
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static SCM scm_unbound_p (SCM obj);
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static SCM scm_sys_bless_applicable_struct_vtables_x (SCM applicable,
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SCM setter);
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static SCM scm_sys_bless_pure_generic_vtable_x (SCM vtable);
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static SCM scm_sys_make_root_class (SCM name, SCM dslots,
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SCM getters_n_setters);
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static SCM scm_sys_init_layout_x (SCM class, SCM layout);
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static SCM scm_sys_goops_early_init (void);
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static SCM scm_sys_goops_loaded (void);
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/* This function is used for efficient type dispatch. */
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SCM_DEFINE (scm_class_of, "class-of", 1, 0, 0,
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(SCM x),
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"Return the class of @var{x}.")
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#define FUNC_NAME s_scm_class_of
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{
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switch (SCM_ITAG3 (x))
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{
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case scm_tc3_int_1:
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case scm_tc3_int_2:
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return class_integer;
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case scm_tc3_imm24:
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if (SCM_CHARP (x))
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return class_char;
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else if (scm_is_bool (x))
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return class_boolean;
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else if (scm_is_null (x))
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return class_null;
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else
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return class_unknown;
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case scm_tc3_cons:
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switch (SCM_TYP7 (x))
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{
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case scm_tcs_cons_nimcar:
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return class_pair;
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case scm_tc7_symbol:
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return class_symbol;
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case scm_tc7_vector:
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case scm_tc7_wvect:
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return class_vector;
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case scm_tc7_pointer:
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return class_foreign;
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case scm_tc7_hashtable:
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return class_hashtable;
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case scm_tc7_fluid:
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return class_fluid;
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case scm_tc7_dynamic_state:
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return class_dynamic_state;
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case scm_tc7_frame:
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return class_frame;
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case scm_tc7_keyword:
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return class_keyword;
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case scm_tc7_vm_cont:
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return class_vm_cont;
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case scm_tc7_bytevector:
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if (SCM_BYTEVECTOR_ELEMENT_TYPE (x) == SCM_ARRAY_ELEMENT_TYPE_VU8)
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return class_bytevector;
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else
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return class_uvec;
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case scm_tc7_array:
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return class_array;
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case scm_tc7_bitvector:
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return class_bitvector;
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case scm_tc7_string:
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return class_string;
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case scm_tc7_number:
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switch SCM_TYP16 (x) {
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case scm_tc16_big:
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return class_integer;
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case scm_tc16_real:
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return class_real;
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case scm_tc16_complex:
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return class_complex;
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case scm_tc16_fraction:
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return class_fraction;
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}
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case scm_tc7_program:
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if (SCM_PROGRAM_IS_PRIMITIVE_GENERIC (x)
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&& SCM_UNPACK (*SCM_SUBR_GENERIC (x)))
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return class_primitive_generic;
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else
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return class_procedure;
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case scm_tc7_smob:
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{
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scm_t_bits type = SCM_TYP16 (x);
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if (type != scm_tc16_port_with_ps)
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return scm_i_smob_class[SCM_TC2SMOBNUM (type)];
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x = SCM_PORT_WITH_PS_PORT (x);
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/* fall through to ports */
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}
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case scm_tc7_port:
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return scm_i_port_class[(SCM_WRTNG & SCM_CELL_WORD_0 (x)
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? (SCM_RDNG & SCM_CELL_WORD_0 (x)
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? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x)
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: SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x))
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: SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))];
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case scm_tcs_struct:
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if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID)
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return SCM_CLASS_OF (x);
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else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
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{
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/* Goops object */
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if (! scm_is_false (SCM_OBJ_CLASS_REDEF (x)))
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scm_change_object_class (x,
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SCM_CLASS_OF (x), /* old */
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SCM_OBJ_CLASS_REDEF (x)); /* new */
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return SCM_CLASS_OF (x);
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}
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else
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return scm_i_define_class_for_vtable (SCM_CLASS_OF (x));
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default:
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if (scm_is_pair (x))
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return class_pair;
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else
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return class_unknown;
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}
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case scm_tc3_struct:
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case scm_tc3_tc7_1:
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case scm_tc3_tc7_2:
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/* case scm_tc3_unused: */
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/* Never reached */
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break;
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}
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return class_unknown;
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}
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#undef FUNC_NAME
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/******************************************************************************
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*
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* initialize-object
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*
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******************************************************************************/
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/*fixme* Manufacture keywords in advance */
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SCM
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scm_i_get_keyword (SCM key, SCM l, long len, SCM default_value, const char *subr)
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{
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long i;
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for (i = 0; i != len; i += 2)
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{
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SCM obj = SCM_CAR (l);
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if (!scm_is_keyword (obj))
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scm_misc_error (subr, "bad keyword: ~S", scm_list_1 (obj));
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else if (scm_is_eq (obj, key))
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return SCM_CADR (l);
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else
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l = SCM_CDDR (l);
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}
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return default_value;
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}
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SCM_DEFINE (scm_get_keyword, "get-keyword", 3, 0, 0,
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(SCM key, SCM l, SCM default_value),
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"Determine an associated value for the keyword @var{key} from\n"
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"the list @var{l}. The list @var{l} has to consist of an even\n"
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||
"number of elements, where, starting with the first, every\n"
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"second element is a keyword, followed by its associated value.\n"
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"If @var{l} does not hold a value for @var{key}, the value\n"
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"@var{default_value} is returned.")
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#define FUNC_NAME s_scm_get_keyword
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{
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long len;
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SCM_ASSERT (scm_is_keyword (key), key, SCM_ARG1, FUNC_NAME);
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len = scm_ilength (l);
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if (len < 0 || len % 2 == 1)
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scm_misc_error (FUNC_NAME, "Bad keyword-value list: ~S", scm_list_1 (l));
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return scm_i_get_keyword (key, l, len, default_value, FUNC_NAME);
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}
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#undef FUNC_NAME
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||
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SCM_KEYWORD (k_init_keyword, "init-keyword");
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static SCM get_slot_value (SCM class, SCM obj, SCM slotdef);
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static SCM set_slot_value (SCM class, SCM obj, SCM slotdef, SCM value);
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||
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SCM_DEFINE (scm_sys_initialize_object, "%initialize-object", 2, 0, 0,
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(SCM obj, SCM initargs),
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||
"Initialize the object @var{obj} with the given arguments\n"
|
||
"@var{initargs}.")
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#define FUNC_NAME s_scm_sys_initialize_object
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||
{
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||
SCM tmp, get_n_set, slots;
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||
SCM class = SCM_CLASS_OF (obj);
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||
long n_initargs;
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||
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SCM_VALIDATE_INSTANCE (1, obj);
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n_initargs = scm_ilength (initargs);
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SCM_ASSERT ((n_initargs & 1) == 0, initargs, SCM_ARG2, FUNC_NAME);
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||
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get_n_set = SCM_SLOT (class, scm_si_getters_n_setters);
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||
slots = SCM_SLOT (class, scm_si_slots);
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||
|
||
/* See for each slot how it must be initialized */
|
||
for (;
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||
!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 */
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||
SCM_MISC_ERROR ("class contains bogus slot definition: ~S",
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||
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,
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||
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,
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||
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
|
||
|
||
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);
|
||
|
||
return SCM_UNSPECIFIED;
|
||
}
|
||
#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_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);
|
||
|
||
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
|
||
|
||
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);
|
||
}
|
||
|
||
/******************************************************************************
|
||
*
|
||
* 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, 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
|
||
|
||
|
||
|
||
/** 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
|
||
|
||
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)
|
||
*
|
||
******************************************************************************/
|
||
|
||
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;
|
||
}
|
||
|
||
return obj;
|
||
}
|
||
#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_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_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.
|
||
*
|
||
******************************************************************************/
|
||
|
||
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
|
||
{
|
||
return scm_apply_0 (scm_variable_ref (var_make), args);
|
||
}
|
||
#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 ? class_procedure_class : class_class;
|
||
|
||
return scm_make_standard_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
|
||
? class_applicable
|
||
: class_top),
|
||
applicablep);
|
||
}
|
||
|
||
void
|
||
scm_i_inherit_applicable (SCM c)
|
||
{
|
||
if (!SCM_SUBCLASSP (c, class_applicable))
|
||
{
|
||
SCM dsupers = SCM_SLOT (c, scm_si_direct_supers);
|
||
SCM cpl = SCM_SLOT (c, scm_si_cpl);
|
||
/* patch class_applicable into direct-supers */
|
||
SCM top = scm_c_memq (class_top, dsupers);
|
||
if (scm_is_false (top))
|
||
dsupers = scm_append (scm_list_2 (dsupers,
|
||
scm_list_1 (class_applicable)));
|
||
else
|
||
{
|
||
SCM_SETCAR (top, class_applicable);
|
||
SCM_SETCDR (top, scm_cons (class_top, SCM_CDR (top)));
|
||
}
|
||
SCM_SET_SLOT (c, scm_si_direct_supers, dsupers);
|
||
/* patch class_applicable into cpl */
|
||
top = scm_c_memq (class_top, cpl);
|
||
if (scm_is_false (top))
|
||
abort ();
|
||
else
|
||
{
|
||
SCM_SETCAR (top, class_applicable);
|
||
SCM_SETCDR (top, scm_cons (class_top, SCM_CDR (top)));
|
||
}
|
||
/* add class to direct-subclasses of class_applicable */
|
||
SCM_SET_SLOT (class_applicable,
|
||
scm_si_direct_subclasses,
|
||
scm_cons (c, SCM_SLOT (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_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 c, class = make_class_from_template ("<%s-port>",
|
||
type_name,
|
||
scm_list_1 (class_port),
|
||
0);
|
||
scm_i_port_class[SCM_IN_PCLASS_INDEX + ptobnum]
|
||
= make_class_from_template ("<%s-input-port>",
|
||
type_name,
|
||
scm_list_2 (class, class_input_port),
|
||
0);
|
||
scm_i_port_class[SCM_OUT_PCLASS_INDEX + ptobnum]
|
||
= make_class_from_template ("<%s-output-port>",
|
||
type_name,
|
||
scm_list_2 (class, class_output_port),
|
||
0);
|
||
scm_i_port_class[SCM_INOUT_PCLASS_INDEX + ptobnum]
|
||
= c
|
||
= make_class_from_template ("<%s-input-output-port>",
|
||
type_name,
|
||
scm_list_2 (class, 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 (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));
|
||
}
|
||
|
||
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);
|
||
}
|
||
|
||
/**********************************************************************
|
||
*
|
||
* C interface
|
||
*
|
||
**********************************************************************/
|
||
|
||
void
|
||
scm_load_goops ()
|
||
{
|
||
if (!goops_loaded_p)
|
||
scm_c_resolve_module ("oop goops");
|
||
}
|
||
|
||
|
||
SCM_KEYWORD (k_setter, "setter");
|
||
|
||
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;
|
||
}
|
||
|
||
#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_vtables_x, "%bless-applicable-struct-vtables!", 2, 0, 0,
|
||
(SCM applicable, SCM setter),
|
||
"")
|
||
#define FUNC_NAME s_scm_sys_bless_applicable_struct_vtables_x
|
||
{
|
||
SCM_VALIDATE_CLASS (1, applicable);
|
||
SCM_VALIDATE_CLASS (2, setter);
|
||
SCM_SET_VTABLE_FLAGS (applicable, SCM_VTABLE_FLAG_APPLICABLE_VTABLE);
|
||
SCM_SET_VTABLE_FLAGS (setter, SCM_VTABLE_FLAG_SETTER_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");
|
||
var_make = scm_c_lookup ("make");
|
||
|
||
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_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_slot_unbound =
|
||
scm_module_variable (scm_module_goops, sym_slot_unbound);
|
||
var_slot_missing =
|
||
scm_module_variable (scm_module_goops, sym_slot_missing);
|
||
var_change_class =
|
||
scm_module_variable (scm_module_goops, sym_change_class);
|
||
setup_extended_primitive_generics ();
|
||
|
||
#if (SCM_ENABLE_DEPRECATED == 1)
|
||
scm_init_deprecated_goops ();
|
||
#endif
|
||
|
||
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:
|
||
*/
|