+/* This function is used for efficient type dispatch. */
+SCM_DEFINE (scm_class_of, "class-of", 1, 0, 0,
+ (SCM x),
+ "Return the class of @var{x}.")
+#define FUNC_NAME s_scm_class_of
+{
+ switch (SCM_ITAG3 (x))
+ {
+ case scm_tc3_int_1:
+ case scm_tc3_int_2:
+ return scm_class_integer;
+
+ case scm_tc3_imm24:
+ if (SCM_CHARP (x))
+ return scm_class_char;
+ else if (scm_is_bool (x))
+ return scm_class_boolean;
+ else if (scm_is_null (x))
+ return scm_class_null;
+ else
+ return scm_class_unknown;
+
+ case scm_tc3_cons:
+ switch (SCM_TYP7 (x))
+ {
+ case scm_tcs_cons_nimcar:
+ return scm_class_pair;
+ case scm_tcs_closures:
+ return scm_class_procedure;
+ case scm_tc7_symbol:
+ return scm_class_symbol;
+ case scm_tc7_vector:
+ case scm_tc7_wvect:
+ return scm_class_vector;
+ case scm_tc7_string:
+ return scm_class_string;
+ case scm_tc7_number:
+ switch SCM_TYP16 (x) {
+ case scm_tc16_big:
+ return scm_class_integer;
+ case scm_tc16_real:
+ return scm_class_real;
+ case scm_tc16_complex:
+ return scm_class_complex;
+ case scm_tc16_fraction:
+ return scm_class_fraction;
+ }
+ case scm_tc7_asubr:
+ case scm_tc7_subr_0:
+ case scm_tc7_subr_1:
+ case scm_tc7_dsubr:
+ case scm_tc7_cxr:
+ case scm_tc7_subr_3:
+ case scm_tc7_subr_2:
+ case scm_tc7_rpsubr:
+ case scm_tc7_subr_1o:
+ case scm_tc7_subr_2o:
+ case scm_tc7_lsubr_2:
+ case scm_tc7_lsubr:
+ if (SCM_SUBR_GENERIC (x) && *SCM_SUBR_GENERIC (x))
+ return scm_class_primitive_generic;
+ else
+ return scm_class_procedure;
+ case scm_tc7_cclo:
+ return scm_class_procedure;
+ case scm_tc7_pws:
+ return scm_class_procedure_with_setter;
+
+ case scm_tc7_smob:
+ {
+ scm_t_bits type = SCM_TYP16 (x);
+ if (type != scm_tc16_port_with_ps)
+ return scm_smob_class[SCM_TC2SMOBNUM (type)];
+ x = SCM_PORT_WITH_PS_PORT (x);
+ /* fall through to ports */
+ }
+ case scm_tc7_port:
+ return scm_port_class[(SCM_WRTNG & SCM_CELL_WORD_0 (x)
+ ? (SCM_RDNG & SCM_CELL_WORD_0 (x)
+ ? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x)
+ : SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x))
+ : SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))];
+ case scm_tcs_struct:
+ if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID)
+ return SCM_CLASS_OF (x);
+ else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
+ {
+ /* Goops object */
+ if (! scm_is_false (SCM_OBJ_CLASS_REDEF (x)))
+ scm_change_object_class (x,
+ SCM_CLASS_OF (x), /* old */
+ SCM_OBJ_CLASS_REDEF (x)); /* new */
+ return SCM_CLASS_OF (x);
+ }
+ else
+ {
+ /* ordinary struct */
+ SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x));
+ if (scm_is_true (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle))))
+ return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle));
+ else
+ {
+ SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle));
+ SCM class = scm_make_extended_class (scm_is_true (name)
+ ? scm_i_symbol_chars (name)
+ : 0,
+ SCM_I_OPERATORP (x));
+ SCM_SET_STRUCT_TABLE_CLASS (SCM_CDR (handle), class);
+ return class;
+ }
+ }
+ default:
+ if (scm_is_pair (x))
+ return scm_class_pair;
+ else
+ return scm_class_unknown;
+ }
+
+ case scm_tc3_struct:
+ case scm_tc3_tc7_1:
+ case scm_tc3_tc7_2:
+ case scm_tc3_closure:
+ /* Never reached */
+ break;
+ }
+ return scm_class_unknown;
+}
+#undef FUNC_NAME
+