IBM AS/400 manual Optimization Considerations, Using RPG-Specific Handlers, keyword, ILE

The following then occurs:

1. Since there are no error indicators coded in PRC2, PRC2 cannot hand function check, and so it is unhandled.

2.Since it is a function check, an inquiry message is issued describ nating condition.

3. Depending		on the response to the inquiry message, PRC2 may be ter
and	the	exception percolated to PRC1 (response is 'C') or processing
tinue	in	PRC2 (response is 'G').

Optimization Considerations

While running a *FULL optimized program, the optimizer may keep frequent values in machine registers and restore them to storage only at prede during normal program processing. Exception handling may break this normal essing and consequently program variables contained in registers may not returned to their assigned storage locations.

Specifically, variables	may	not	contain their current values if an exce
and you recover from	it	using	one of:

¹ *PSSR error subroutine

¹ INFSR error subroutine

¹User-defined exception handler

¹

The

Go

('G')

option

from

an

inquiry

message.

¹

The

Retry

('R')

option

from

an

inquiry

message.

ILE

RPG

automatically

defines indicators

such that

they contain

their c

even with

full

optimization.

To ensure that the content of fields or d

contain

their

correct

(current) values, specify the NOOPT keyword on th

priate

Definition

specification.

For

more

information

on

the

NOOPT

keyword,ILE

RPGsee for

AS/400 Reference.

For

more

information

on

optimization,

see

“Changing

the

Optimization

Level”

page

87.

Using RPG-Specific Handlers

ILE RPG provides three ways for you to enable HLL-specific handlers a recover from the exception:

1. error indicators or 'E' operation code extender

2.INFSR error subroutine

3.*PSSR error subroutine.

You can obtain more information about the error which occurred by								co
appropriate data			structures and querying the relevant				data structure
If	you	are using	the 'E'	extender instead	of	error	indicators, the
and	file	error information		can be obtained	by	using	the %STATUS and	%ERR

built-in-functions.

226 ILE RPG for AS/400 Programmer's Guide