pTAL Conversion Guide

Structures
pTAL Conversion Guide—527302-002
11-14
Template Structure Syntax
field-alignment
FIELDALIGN
specifies how you want the compiler to align the base of the structure and
fields in the structure. The offsets of fields in a structure are aligned relative to
the base of the structure.
If a definition substructure does not specify a FIELDALIGN clause, the
contained substructure’s field alignment is the field alignment of its
encompassing structure or substructure.
If you do not specify a FIELDALIGN clause on a structure declaration, pTAL
uses the current value of the FIELDALIGN compiler directive. The default value
of the FIELDALIGN directive is AUTO.
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, except
STRING fields, must begin at an even-byte address.
SHARED8
specifies that the offset of each field in the structure from the base of the
structure must 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 AUTO attribute is not necessarily the same as the AUTO attribute in the
native mode HP C compiler.)
FIELDALIGN
( SHARED2
SHARED8
AUTO
PLATFORM
)
VST992.vsd