Replacing sections

An entire section can be replaced with a new section. Sections can be replaced either automatically or with a REPLACE control statement. Automatic replacement acts upon all input modules; the REPLACE statement acts only upon the module that follows it.

Note:

Any CSECT identification records (IDR) associated with a particular section are also replaced.
For assembler language programmers only: When some but not all sections of a separately assembled module are to be replaced, the binder causes A-type address constants that refer to a deleted symbol to be incorrectly resolved unless the entry name is at the same displacement from the origin in both the old and the new section. If all sections of a separately assembled module are replaced, no restrictions apply.