TAL Reference Manual

Standard Functions

TAL Reference Manual—526371-001

14-43

Example of $USERCODE Function

In this example, $USERCODE returns the content of a word located at a label in the

current user code segment:

PROC p; !Declare procedure

BEGIN

INT a, b, c; !Declare variables

!Some code here

u_code_location: !Label a location

a := a + b;

!More code here

c := $USERCODE (@u_code_location); !Get content of word

END; ! located at label

$XADR Function

The $XADR function converts a standard address to an extended address.

variable

is the identifier of a simple variable, pointer, array element, structure, or structure

data item. For any other variable, the compiler issues a warning.

Usage Considerations

$XADR returns an extended address from the standard address of variable. (If variable

is a pointer, $XADR returns the extended address of the data to which the pointer

points, not the address of the pointer itself.) If

variable already has an extended

address, $XADR returns the extended address; in this case, $XADR behaves like the

@ operator.

If a structure spans the 32K-word boundary of the user data segment, $XADR cannot

return an extended address from the standard address of a byte-addressed structure

item.

You cannot use $XADR at the global level because $XADR uses compiler-generated

code to compute the extended address.

$XADR (

)

variable

VST1446.vsd