ObjectSpace._dump_all

static VALUE
objspace_dump_all(VALUE os, VALUE output, VALUE full, VALUE since)
{
    struct dump_config dc = {0,};
    dump_output(&dc, output, full, since);

    if (!dc.partial_dump || dc.since == 0) {
        /* dump roots */
        rb_objspace_reachable_objects_from_root(root_obj_i, &dc);
        if (dc.roots) dump_append(&dc, "]}\n");
    }

    /* dump all objects */
    rb_objspace_each_objects(heap_i, &dc);

    return dump_result(&dc);
}