-/* These variables are filled in by the object system when loaded. */
-SCM scm_class_boolean, scm_class_char, scm_class_pair;
-SCM scm_class_procedure, scm_class_string, scm_class_symbol;
-SCM scm_class_procedure_with_setter, scm_class_primitive_generic;
-SCM scm_class_vector, scm_class_null;
-SCM scm_class_integer, scm_class_real, scm_class_complex;
-SCM scm_class_unknown;
-
-SCM *scm_port_class = 0;
-SCM *scm_smob_class = 0;
-
-SCM scm_no_applicable_method;
-
-SCM (*scm_make_extended_class) (char *type_name);
-void (*scm_make_port_classes) (int ptobnum, char *type_name);
-void (*scm_change_object_class) (SCM, SCM, SCM);
-
-/* This function is used for efficient type dispatch. */
-SCM
-scm_class_of (SCM x)
-{
- switch (SCM_ITAG3 (x))
- {
- case scm_tc3_int_1:
- case scm_tc3_int_2:
- return scm_class_integer;
-
- case scm_tc3_imm24:
- if (SCM_CHARP (x))
- return scm_class_char;
- else
- {
- switch (SCM_ISYMNUM (x))
- {
- case SCM_ISYMNUM (SCM_BOOL_F):
- case SCM_ISYMNUM (SCM_BOOL_T):
- return scm_class_boolean;
- case SCM_ISYMNUM (SCM_EOL):
- return scm_class_null;
- default:
- return scm_class_unknown;
- }
- }
-
- case scm_tc3_cons:
- switch (SCM_TYP7 (x))
- {
- case scm_tcs_cons_nimcar:
- return scm_class_pair;
- case scm_tcs_closures:
- return scm_class_procedure;
- case scm_tcs_symbols:
- return scm_class_symbol;
- case scm_tc7_vector:
- case scm_tc7_wvect:
-#ifdef HAVE_ARRAYS
- case scm_tc7_bvect:
- case scm_tc7_byvect:
- case scm_tc7_svect:
- case scm_tc7_ivect:
- case scm_tc7_uvect:
- case scm_tc7_fvect:
- case scm_tc7_dvect:
- case scm_tc7_cvect:
-#endif
- return scm_class_vector;
- case scm_tc7_string:
- case scm_tc7_substring:
- return scm_class_string;
- case scm_tc7_asubr:
- case scm_tc7_subr_0:
- case scm_tc7_subr_1:
- case scm_tc7_cxr:
- case scm_tc7_subr_3:
- case scm_tc7_subr_2:
- case scm_tc7_rpsubr:
- case scm_tc7_subr_1o:
- case scm_tc7_subr_2o:
- case scm_tc7_lsubr_2:
- case scm_tc7_lsubr:
- if (SCM_SUBR_GENERIC (x) && *SCM_SUBR_GENERIC (x))
- return scm_class_primitive_generic;
- else
- return scm_class_procedure;
- case scm_tc7_cclo:
- return scm_class_procedure;
- case scm_tc7_pws:
- return scm_class_procedure_with_setter;
-
- case scm_tc7_smob:
- {
- long type = SCM_TYP16 (x);
- if (type != scm_tc16_port_with_ps)
- return scm_smob_class[SCM_TC2SMOBNUM (type)];
- x = SCM_PORT_WITH_PS_PORT (x);
- /* fall through to ports */
- }
- case scm_tc7_port:
- return scm_port_class[(SCM_WRTNG & SCM_CELL_WORD_0 (x)
- ? (SCM_RDNG & SCM_CELL_WORD_0 (x)
- ? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x)
- : SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x))
- : SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))];
- case scm_tcs_cons_gloc:
- /* must be a struct */
- if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID)
- return SCM_CLASS_OF (x);
- else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
- {
- /* Goops object */
- if (! SCM_FALSEP (SCM_OBJ_CLASS_REDEF (x)))
- scm_change_object_class (x,
- SCM_CLASS_OF (x), /* old */
- SCM_OBJ_CLASS_REDEF (x)); /* new */
- return SCM_CLASS_OF (x);
- }
- else
- {
- /* ordinary struct */
- SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x));
- if (SCM_NFALSEP (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle))))
- return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle));
- else
- {
- SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle));
- SCM class = scm_make_extended_class (SCM_NFALSEP (name)
- ? SCM_ROCHARS (name)
- : 0);
- SCM_SET_STRUCT_TABLE_CLASS (SCM_CDR (handle), class);
- return class;
- }
- }
- default:
- if (SCM_CONSP (x))
- return scm_class_pair;
- else
- return scm_class_unknown;
- }
-
- case scm_tc3_cons_gloc:
- case scm_tc3_tc7_1:
- case scm_tc3_tc7_2:
- case scm_tc3_closure:
- /* Never reached */
- break;
- }
- return scm_class_unknown;
-}
-
-/* (SCM_IM_DISPATCH ARGS N-SPECIALIZED