pTAL Reference Manual (G06.24+, H06.09+, J06.03+)

If you specify a FIELDALIGN (NODEFAULT) compiler directive, you must specify a
FIELDALIGN clause on every definition structure and template structure.
SHARED2
specifies that the base of the structure and each field in the structure must begin at an even
byte address except STRING fields.
SHARED8
specifies that the offset of each field in the structure from the base of the structure must be
begin at an address that is an integral multiple of the width of the field.
AUTO
specifies that the structure and the fields of the structure be aligned according to the optimal
alignment for the architecture on which the program will run (this is not the same behavior
as the AUTO attribute has in the native mode HP C compiler).
PLATFORM
specifies that the structure and the fields of the structure must begin at addresses that are
consistent across all languages on the same architecture.
previous-identifier
is the identifier of a simple variable, array, substructure, or pointer previously declared in the
same structure. No index is allowed with this identifier.
structure-layout
is the same BEGIN-END block as for structures. It can contain declarations for simple variables,
arrays, substructures, filler bits, filler bytes, redefinitions, simple pointers, and structure pointers.
The size of one substructure occurrence is the size of the layout, either in odd or even bytes.
The total layout for one occurrence of the encompassing structure must not exceed 32,767
bytes.
If the previous item is a substructure and you omit the bounds or if either bound is 0, the new
substructure and the previous substructure occupy the same space and have the same offset from
the beginning of the structure.
156 Structures