Hardware detection of undefined references

Authors:
G. W. Gerrity
Affiliations:
University of New South Wales, Duntroon, Australia
Venue:
ACM SIGARCH Computer Architecture News
Year:
1980

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Abstract

The construction of reliable programs could benefit substantially from improved hardware support. The automatic detection of one particularly common programming error, namely, the failure to define the value of a data element before referencing it, is quite simple and can be implemented in most microprogrammed machines. A method of introducing machine-detectable null elements for this purpose is described. This leads naturally to a re-appraisal of the basic operations CLEAR and ASSIGN.