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Status Not under consideration
Workspace PL/I Compilers
Created by Guest
Created on Oct 30, 2018

RELATED IDEAS

BY NAME, Mis-Matched Level Numbers

A compiler warning should be issued when there is a level number mis-match on an assignment statement using BY NAME. Currently there is no compile-time notification that there is a problem. We only find out at runtime and only if data conditions exist that would cause problems during unit or system testing. Otherwise, we may not have a runtime problem until sometime in the future when data conditions are right. If we make a mistake like the example below, we can't prevent this code from making it to production.

DCL
1 STRUCT1 UNALIGNED,
2 FIELD1 CHAR(1) INIT('A'),
2 FIELD2 CHAR(1) INIT('B'),
2 SUB_FIELDS_FIELD2,
3 SUB_FIELD1 CHAR(1) INIT('0'),
...
2 FIELD26 CHAR(1) INIT('Z ');

DCL
1 STRUCT2 UNALIGNED,
2 FIELD1 CHAR(1) INIT(' '),
2 FIELD2 CHAR(1) INIT(' '),
2 SUB_FIELD1 CHAR(1) INIT(' ');

STRUCT2 = STRUCT1, BY NAME;

RESULTS:
STRUCT2.FIELD1 = 'A'
STRUCT2.FIELD2 = 'B'
STRUCT2.SUB_FIELD1 = ' '

STRUCT2.SUB_FIELD1 being blank is not the intended result.

Can we get a warning message:
IBMxxxxI W xxx.0 Structure level mismatch in assignment statement.

Idea priority Medium
  • Guest
    Reply
    |     Dec 8, 2020

    his requirement has been re-assessed.  It is not likely that this will be implemented in the next 12-24 months and so it is being declined at this point. The requirement will be kept in the RFE system and might be reassessed in the future. You also have an opportunity to resubmit in twelve months time if you wish it to be reconsidered then.

  • Guest
    Reply
    |     Nov 19, 2018

    We all make mistakes, and it's easy enough to issue a message when it sees this and for users to change its severity as they wish

  • Guest
    Reply
    |     Nov 13, 2018

    What I am saying is, if two field names match between the two structures involved in a BY NAME assignment, but the level numbers of the fields are different, I would like to see a warning/informational message letting me know there is a problem with the level number and the field will not be assigned.

  • Guest
    Reply
    |     Nov 13, 2018

    Just to make sure I am reading this right: what you would like is: if the compiler finds no match for a target element in a BY NAME assignment, then it checks if there would be a match if children of the source were examined? is this correct?

  • Guest
    Reply
    |     Nov 7, 2018

    Generally speaking, compilers assist the programmer in his work, when applicable.

  • Guest
    Reply
    |     Nov 7, 2018

    Generally speaking, compilers assist the programmer in his work, when applicable.

  • Guest
    Reply
    |     Oct 31, 2018

    If you cannot properly declare matching structures that are going to be used in "BY NAME" assignments, you should use the "RULES(NOBYNAME)" compiler option, yet another option to flag sloppy coding is not a solution.

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