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On 11-Jan-08, at 11:29 AM, midrange-l-request@xxxxxxxxxxxx wrote:

Yet during the CISC to RISC conversion a few companies made quite a bit of money decompiling code with
observability removed.

That could be done with OPM code in part because the generated code patterns were fairly consistent, and almost everything was embedded in the generated code. For example the entire logic for each I/O operation is generated which is very different from the "ILE way".

The same folks who wrote those tools expended a lot of time and energy trying to do the same thing with ILE code and to the best of my knowledge failed fairly miserably.

In part this is probably because the ILE compilers are a rare case of IBM eating its own cooking and the generated code makes heavy use of procedures in service programs to do its work. There is also the fact that the optimizer (even when no optimization is requested) makes changes to the code and, as Mark noted, New MI (or MI prime) is not documented outside of IBM.

Jon Paris

www.Partner400.com
www.SystemiDeveloper.com



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