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 for macro preprocessor
From The Free On-line Dictionary of Computing (30 December 2018) :

  macro preprocessor
      A program that transforms input data in some way
     before it is read by the main program.  In the case of a
     compiler, the input is source code.  The main advantage of
     using a preprocessor is that it is possible to change the
     specification of the input data without changing the main
     program.  The separation can also help to make the system's
     overall behaviour easier to understand.  The disadvantage is
     that performance may be reduced by the extra input and output
     performed between the two programs.
     For example, the C preprocessor, cpp, handles textual
     macro substitution (it acts as a "macro preprocessor"),
     conditional compilation and inclusion of other files.
     A preprocessor may be used to transform a program into a
     simpler language, e.g. to transform C++ into C.

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