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#### Passing Parameters by Reference

If the parameter is passed by reference (e.g., Pascal `VAR` parameters), then the symbol descriptor is `v` if it is in the argument list, or `a` if it in a register. Other than the fact that these contain the address of the parameter rather than the parameter itself, they are identical to `p` and `R`, respectively. I believe `a` is an AIX invention; `v` is supported by all stabs-using systems as far as I know.