debug macro

#define DEBUG
#ifdef DEBUG
#define DEBUG_CMD(cmd)                                                                             \
    do {                                                                                           \
        cmd;                                                                                       \
    } while (false)
#else
#define DEBUG_CMD(cmd)                                                                             \
    do {                                                                                           \
        ;                                                                                          \
    } while (false)
#endif
#define _DEBUG_CMD(cmd)                                                                            \
    do {                                                                                           \
        ;                                                                                          \
    } while (false)