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Index > Compiler Internals > request: Please describe fields of [macro_status] variable

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Daemon



Joined: 08 Jul 2003
Posts: 15
Daemon
request to Privalov: please describe fields of [macro_status] variable and what happens with it when macro block found.

Greetz,
    Daemon.
Post 03 Jun 2004, 06:48
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7796
Location: Kraków, Poland
Tomasz Grysztar
The lower nibble (bits 0-3) contains the info related to the macroinstruction that is currently being declared, while the higher nibble (bits 4-7) contain the status of processing the macro.

The values of lower nibble can be:

  • 0 - no macro is being declared currently, default value;
  • 1 - the declaration of macro has started, but no { - macro contents opening character has been found yet;
  • 2 - the contents of macro declaration is being preprocessed;


The higher nibble consist of flags, currently only two are defined:

  • bit 4 (value 10h) - some macro is currently processed;
  • bit 5 (value 20h) - internal flag of macro preprocessor, used to determine whether we are in the place where some macro directive might be used


Note that both higher and lower nibble can have non-zero value at the same time, since macro can define some other macro.
Post 04 Jun 2004, 13:31
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