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(stabs.info)Subranges

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Subrange Types
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   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 (Note: Arrays).

   Instead of an integer, either bound can be one of the following:

`A OFFSET'
     The bound is passed by reference on the stack at offset OFFSET
     from the argument list.  Note: Parameters, for more information
     on such offsets.

`T OFFSET'
     The bound is passed by value on the stack at offset OFFSET from
     the argument list.

`a REGISTER-NUMBER'
     The bound is passed by reference in register number
     REGISTER-NUMBER.

`t REGISTER-NUMBER'
     The bound is passed by value in register number REGISTER-NUMBER.

`J'
     There is no bound.

   Subranges are also used for builtin types; see Note: Traditional
Builtin Types.