std::tuple<const char *, device_t *, device_t *> machine_config::prepare_replace(const char *tag)
{
// make sure we have the old device's actual owner
std::pair<const char *, device_t *> const owner(resolve_owner(tag));
assert(owner.second);
// remove references to the old device
device_t *const old_device(owner.second->subdevice(owner.first));
if (old_device)
remove_references(*old_device);
else
osd_printf_warning("Warning: attempting to replace non-existent device '%s'\n", tag);
return std::make_tuple(owner.first, owner.second, old_device);
}
device_t *machine_config::device_remove(device_t *owner, const char *tag)
{
// find the original device by relative tag (must exist)
assert(owner != nullptr);
device_t *device = owner->subdevice(tag);
if (device == nullptr)
{
osd_printf_warning("Warning: attempting to remove non-existent device '%s'\n", tag);
return nullptr;
}
// make sure we have the old device's actual owner
owner = device->owner();
assert(owner != nullptr);
// remove references to the old device
remove_references(*device);
// let the device's owner do the work
owner->subdevices().m_list.remove(*device);
return nullptr;
}
device_t *machine_config::device_replace(device_t *owner, const char *tag, device_type type, UINT32 clock)
{
// find the original device by relative tag (must exist)
assert(owner != nullptr);
device_t *old_device = owner->subdevice(tag);
if (old_device == nullptr)
{
osd_printf_warning("Warning: attempting to replace non-existent device '%s'\n", tag);
return device_add(owner, tag, type, clock);
}
// make sure we have the old device's actual owner
owner = old_device->owner();
assert(owner != nullptr);
// remove references to the old device
remove_references(*old_device);
// allocate the new device
device_t *new_device = (*type)(*this, tag, owner, clock);
// substitute it for the old one in the owner's list
return &config_new_device(owner->subdevices().m_list.replace_and_remove(*new_device, *old_device));
}
