On 8 September 2016 at 00:55, Itschak Mugzach <[email protected]> wrote:
> I am interested in ibm's Rexx compiler eye-catcher. Can you point me to the 
> document that the information you mentioned described there?

As I said, it's in the TSO/E Customization book. The edition I have
here is SA32-0976-02 z/OS V2R2 TSO/E Customization. It's in Chapter 43
"Routines and interfaces to support a REXX compiler".

But I don't think the exact format of the eyecatcher is documented
there or anywhere else. The Customization book is about customizing
TSO/E rather than the REXX compiler. This book is agnostic about the
compiler; you can in theory write or buy one from anywhere, and it
might have a different eyecatcher from IBM's, or none at all. For that
matter, there is nothing I can see to require that the CEXEC file must
begin with executable code. When TSO/E runs a CEXEC, it doesn't branch
to the start of the CEXEC, but rather it calls the routine whose name
is in columns 13-20. That routine invokes the CEXEC code, but that
code could be in Java bytecodes or any other scheme, as far as I can
tell.

Tony H.

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