Re: instruction pointers. calling a module.

["Steve Richter" <srichter@xxxxxxxxxxxxx>]

>
>Steve, can you explain to me how "external module functionality" differs
>from late-bound program calls?
>
>- Bob Donovan
>


Bob,

My module call would be the calli equivalent of spcptr access to a usrspc.
Once the InsPtr has been resolved to the module entry point, execution speed
would be the same as CALLI to an internal entry point.

System integrity would not be compomised because an InsPtr could only be set
to the entry point of the module. Modules could only be called from pgms, so
all the usrprf security of the job and pgm would apply to the module.

How is this diff from CALLB.  I dont know how ile modules are implemented
and branched to so I cant say.

But the ile callb does update the call stack, does have built in scoping and
has multiple entry points into the external module, so there is probably
more overhead involved in calling an ile module than my proposed mi module.

My modules would be one function, one module. An optional associated space
would provide room for the function desc and debug info like the function
source code.

Argument passing, call stack updating, would be the responsibilty of the
caller. I think the machine should be non partisan, or at least have a non
partisan mode, when it comes to how a function call stack should be
structured.

The module/function name should be as long as possible. Use the 30 char max
min object name?  Best would be the support of an AKA name on the RSLVSP
cmd. An unlimited lgth name that corresponds to the short system name would
be stored by the machine and could be spcfd when RSLVSP to the machine
object.

etc, etc.

Steve Richter

>
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