TAL Programmer's Guide

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Accessing the Upper 32K-Word Area

Managing Addressing

B–4 096254 Tandem Computers Incorporated

Storing Addresses

in Structure Pointers

You can store an address in a structure pointer either by initializing the pointer at

declaration or by assigning an address to it after declaration.

Initializing Structure Pointers

You can declare an extended structure pointer named EXT_STRUCT_PTR, specify a

referral named MY_STRUCT and then initialize the pointer with the first byte address

of the upper 32K-word area of the current user data segment as follows:

INT .EXT ext_struct_ptr (my_struct) := %200000D;

!First byte address in upper

! 32K-word area

To associate an INT standard structure pointer with a template structure and initialize

the structure pointer with the first word address in the upper 32K-word area of the

current user data segment, specify:

STRUCT names (

); !Declare template structure

BEGIN

INT array[0:11];

END;

INT .struc_ptr (names) := %100000;

!Declare structure pointer;

! initialize it with first word

! address in upper 32K-word area

To associate an extended structure pointer with the structure pointer declared in the

preceding example and initialize the new structure pointer with the first byte address

in the upper 32K-word area of the current user data segment, specify:

STRING .EXT ex_strc_ptr (struc_ptr) := %200000D;

!Declare extended structure

! pointer; initialize it with

! first byte address in

! upper 32K-word area

Assigning Addresses to Structure Pointers

Once you have declared a structure pointer, you can use an assignment statement to

assign an address to the structure pointer.

You can associate an INT structure pointer with a template structure and then assign

the first word address in the upper 32K-word area of the current user data segment to

the structure pointer: