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  2. RPG400-L
  3. March 2002

RE: API prototypes in /COPY member

>From: Jim Langston <jlangston@celsinc.com>
>Date: Tue, 5 Mar 2002 11:35:45 -0800
>
>Wow, Barbara, is that legal?
>
>I thought the RPG compilers were single passes.  So how would it know the
>size of Error in the middle of Error?

Jim, the RPG compilers only read the source once, but they create
a dictionary and an intermediate representation of the program*
that they then go through a couple more times (once for relational
diagnostics and once for code generation).

RPG allows forward referencing (almost?) everywhere.

* this _isn't_ the famous IRP that you can see when you CRTRPGPGM
  GENOPT(*LIST).  It's just a set of compiler-internal structures
  that the compiler builds for itself from the source.

Barbara Morris

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