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Status Not under consideration
Workspace COBOL Compilers
Created by Guest
Created on Apr 23, 2020

RELATED IDEAS

False INITCHECK messages for MOVEs of overlapping storage

The compiler should not produce INITCHECK warnings when the piece of a source field of an overlapping MOVE is initialized.

In the example use case, the overlapping move results in WORK-REST being set to LOW-VALUES from the filler at the beginning of WORK-TABLE.

The compiler is falsely reporting that the target of the overlapping MOVE (i.e. WORK-REST) "may be used at this statement before it is set".

Notes:
1. The COBOL manual states of overlapping moves that “the result of the execution of such a statement is unpredictable”
2. It is more developer friendly and likely more efficient to initialize the field with MOVE LOW-VALUES TO WORK-REST. It will use a series of XC instructions and only burn one register versus using two registers for the series of overlapping MVCs.

Idea priority Low
  • Guest
    Reply
    |     May 1, 2020

    Hi,

    The compiler is not reporting the receiver. It is reporting the sender.

    If we find that a group is initialized, we report the first uninitialized item in that group, rather than the group itself. If a testcase had a group with many children, and nearly all were initialized, we wouldn't want the group being reported, causing users to have to figure out, on their own, which individual items were uninitialized.

    INITCHECK shouldn't have the additional task of figuring out exact copy semantics for an overlapping move.
    To avoid that, users can write code by not having a four-byte FILLER as a part of WORK-TABLE, and instead MOVE LOW-VALUES to WORK-TABLE to get the same result.

    Also, some clients would want to have a report when there's an overlapping move.

    Due to the above, we are rejecting this RFE.

    Thanks.

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