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Appendix B Expression Diagrams

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The following diagrams depict valid expressions for DAT/Debug:

expression :=

---+-->      simpexpr       ---+-->

   |                          |

   +<--    simpexpr relop      --+




simpexpr :=

[+-] --+-->      term          --+-->

       |                        |

       +<----     + -      -----+   add, subtract

       |                        |

       +<----     OR       -----+   logical OR




term :=

--+-->      factor         --+-->

  |                        |

  +<----      * /     -----+   multiply, divide

  |                        |

  +<-------  MOD    -------+   modulus

  |                        |

  +<-------  AND    -------+   logical AND




factor :=

--+-->    addrvalue    -----+-->

  |                        |

  +<----     <<       -----+   left shift bits

  +<----     >>       -----+   right shift bits

  |                        |

  +<-------- BAND ---------+   bit AND

  +<-------- BOR  ---------+   bit OR




addrvalue :=

--+-->       value       --->

  |

  +-->    value.value      --->  a.cooo2c40

                                pc, cmpc, pw


value :=

--+-->   numeric-literal      ---+-->    224

  |                         |

  +-->    string-literal       -->+       "AB", 'ab', `ab`

  |                         |

  +-->      variable         -->+       sdst

  |                         |

  +-->  [ indirect_addr  ]    -->+       contents of

  |                         |

  +-->    ( simpexpr  )     -->+       ( 25/3 + 1 )

  |                         |

  +-->   NOT expression      -->+       NOT (n < 6 )

  +-->  BNOT expression      -->+       BNOT $FF0F




numeric-literal :=

123 | %123 | #123 | $123  default, oct, dec, hex


string-literal :=

"ABCD"  |  'ABCD'  |  `abcd`


relop :=

<  <=  =  >  >=  <>


indirect-addr :=

CST    seg.offset

CSTX   seg.offset

DST    seg.offset

ABS    [offset]

DB     [offset]

S      [offset]

Q      [offset]

P      [offset]

REAL   offset



[VIRT] offset

[VIRT] sid.offset

[VIRT] nmlogaddr



CMLOG  cmlogaddr



SEC    ldev.offset

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