Re: *PSSR subroutine and the call stack -- MIDRANGE-L

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John Hall <jhall@hillmgt.com> wrote:

>>From this experience, I surmise that subroutine returns are implemented as
>> branches to a program counter address which is set at the time the
>> subroutine is first invoked. RPG doesn't complain about recursion either.
>> It just doesn't work.
>> Pete Hall
>
>From everything written here I think the "RETURN" or branch statement is
>probably resolved at compile time.
>So that the exsr was implemented strictly as a pair of goto statements
>and is used for readability only.

John,

If that were true you'd only be able to execute a subroutine from one place,
which is patently not correct.

Dave Kahn, ABB Steward Ltd.


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