Rational Developer for System z
PL/I for Windows, Version 7.6, Programming Guide

SNAP

When you use the SNAP option, the compiler generates extra instructions in the prolog and epilog code for every block. These instructions ensure that the run-time traceback messages (produced by PLIDUMP and the SNAP option on an ON statement) include all procedures that were active when the traceback was requested.

A trade-off of using the SNAP option and creating these additional instructions is that it can have a negative impact on the performance of your application. This is especially true for procedures that are called frequently.


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