HLASM Language Reference

Assembler Language Coding Conventions
column of the next line, the SI and SO are considered redundant and are
removed from the statement before statement analysis.
An extended continuation-indicator provides a flexible end column on a
line-by-line basis to support any alignment of double-byte data in a source
statement. The end column of continued lines may be shifted to the left by
extending the continuation-indicator.
To guard against accidental continuation caused by double-byte data ending in
the continuation-indicator column, neither SO nor SI is regarded as a
continuation-indicator. If either is used, the following warning message is
issued:
ASMA21W SO or SI in continuation column - no continuation
assumed
The examples below show the use of these features. Refer to “Double-Byte
Character Set Notation” on page xvi for the notation used in the examples.
Source Input Considerations
Extended continuation-indicators may be used in any source statement,
including macro statements and statements included by the COPY instruction.
| This feature is intended for source lines containing double-byte data, however it
| becomes available to all lines when the DBCS option is set.
On a line with a non-space continuation-indicator, the end column is the first
column to the left of the continuation-indicator which has a value different from
the continuation-indicator.
When converting existing programs for assembly with the DBCS option, ensure
that continuation-indicators are different from the adjacent data in the end
column.
The extended continuation-indicators must not be extended into the continue
column, otherwise the extended continuation-indicators are treated as data, and
the assembler issues the following error message:
ASMA25E Extended continuation column must not extend into continue
column
For SI and SO to be removed at continuation points, the SI must be in the end
column, and the SO must be in the continue column of the next line.
Examples:
Name Operation Operand Continuation
│
▼
DBCS1 DC C'XXXXXXXXXXXXXXXXXXXX
'
DBCS2 DC C'abcdefghijklmnopqrstuvwxyz123456789XXXX
'
DBCS3 DC C'abcdefghijklmnopqrstuvXX
'
DBCS1: The DBCS1 constant contains 11 double-byte characters bracketed by SO
and SI. The SI and SO at the continuation point are not assembled into the
operand. The assembled value of DBCS1 is:
Chapter 2. Coding and Structure 17