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Activation Records

• The format, or layout, of the noncode part of an executing subprogram is called an activation record (AR)

• An activation record instance (ARI) is a concrete example of an activation record (the collection of data for a particular subprogram activation)

• FORTRAN 77 subprograms can have no more than one activation record instance at any given time

• The code of all of the program units of a FORTRAN 77 program may reside together in memory, with the data for all units stored together elsewhere

• The alternative is to store all local subprogram data with the subprogram code