The `r' type descriptor defines a type as a subrange of another type. It is followed by type information for the type of which it is a subrange, a semicolon, an integral lower bound, a semicolon, an integral upper bound, and a semicolon. The AIX documentation does not specify the trailing semicolon, in an effort to specify array indexes more cleanly, but a subrange which is not an array index has always included a trailing semicolon (see section Array Types).
Instead of an integer, either bound can be one of the following:
A offset
T offset
a register-number
t register-number
J
Subranges are also used for builtin types; see section Traditional Builtin Types.
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