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This RFE is one of a small group which had apparently been set aside incorrectly years ago and subsequently overlooked. We are sorry for the delay.
As for many types of suggested error check, the situation in the provided example is very clear, but it is not at all easy to come up with a general rule that can distinguish usefully enough between probable error cases and normal cases. For example, if the expression is of the form FIELD-STRUCT+STRUCTAREA this is probably a perfectly normal reference to a field FIELD within a structure mapped by structure STRUCT which has been stored in area STRUCTAREA, and references such as FIELD-L'FIELD and FIELD+L'FIELD might be valid references to the previous and next fields in some table.
In this case, it might be possible to issue a warning not because of any problem with the first operand but because the second operand length does not match the move length. However, Dr. John Ehrman (the original HLASM planner) said many years ago that when similar warnings were added to a student assembler, they were usually disabled because they gave too many false positives.
It seems possible that if HLASM could implement a very fine-grained set of warnings which can easily be customized, we might be able to allow users to check for many possible errors while disabling checks which were spuriously triggered by commonly used programming techniques. However, at present we feel that the limited benefits of the suggested checks in this case combined with the work needed to implement them means that we are not likely to address this requirement in the near future, so we are declining it at this point.
Jonathan Scott, HLASM
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - Enterprise Tooling
Product - High Level Assembler (HLASM)
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Enterprise Tooling
Product - High Level Assembler (HLASM)
This is a good idea and accept that we should look to see what can be added to HLASM to assist.
Sharuff
Sharuff Morsa IBM Hursley Labs