pTAL Conversion Guide

Contents

pTAL Conversion Guide—527302-002

11. Structures

Pictorial Overview of pTAL Structure Alignment 11-1

Overview of Field Alignment 11-7

Field and Base Alignment 11-9

Base Alignment 11-9

Structure Declarations 11-9

Definition Structure Syntax 11-10

Template Structure Syntax 11-13

Referral Structure Syntax 11-15

NODEFAULT Alignment 11-15

Structure Fields 11-15

VOLATILE Attribute 11-15

REFALIGNED Clause 11-16

Field Alignment 11-16

FIELDALIGN Clause 11-16

FIELDALIGN Compiler Directive 11-17

Using Field Alignment 11-17

Arrays in Structures 11-24

Arrays of Structures and Substructures 11-24

Optimizing Structure Layouts 11-25

Considerations 11-27

Structure Alignment 11-28

Substructure Alignment 11-29

Reference Alignment With Structure Pointers 11-30

Default Reference Alignment 11-30

REFALIGNED(2) 11-31

REFALIGNED(8) 11-32

Alignment Considerations for Structures and Substructures 11-34

pTAL Code Generation for Structure References 11-35

12. Equivalenced Variables

Terminology 12-1

Declaring Equivalenced Nonstructures 12-4

Declaring Equivalenced Structures 12-6