/*
 *  call-seq:
 *     obj.instance_variables    => array
 *  
 *  Returns an array of instance variable names for the receiver. Note
 *  that simply defining an accessor does not create the corresponding
 *  instance variable.
 *     
 *     class Fred
 *       attr_accessor :a1
 *       def initialize
 *         @iv = 3
 *       end
 *     end
 *     Fred.new.instance_variables   #=> ["@iv"]
 */

VALUE
rb_obj_instance_variables(obj)
    VALUE obj;
{
    VALUE ary;

    ary = rb_ary_new();
    switch (TYPE(obj)) {
      case T_OBJECT:
      case T_CLASS:
      case T_MODULE:
	if (ROBJECT(obj)->iv_tbl) {
	    st_foreach_safe(ROBJECT(obj)->iv_tbl, ivar_i, ary);
	}
	break;
      default:
	if (!generic_iv_tbl) break;
	if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
	    st_table *tbl;

	    if (st_lookup(generic_iv_tbl, obj, (st_data_t *)&tbl)) {
		st_foreach_safe(tbl, ivar_i, ary);
	    }
	}
	break;
    }
    return ary;
}