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STABS

4.7.3 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.