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  1. Proceedings of the 1999 ACM SIGPLAN-SIGSOFT workshop on Program analysis for software tools and engineering (PASTE '99)
  2. Identifying procedural structure in Cobol programs
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Identifying procedural structure in Cobol programs

Content Provider ACM Digital Library
Author Ramalingam, G. Field, John
Abstract The principal control-flow abstraction mechanism in the Cobol language is the perform statement. Normally, perform statements are used in a straightforward manner to define parameterless procedures (where global variables are used to pass data into and out of procedure bodies). However, unlike most procedural constructs, distinct performed procedures can share code in arbitrarily complicated ways. In addition, performs can also be used in such a way as to cause transfers of control that do not correspond to normal call/return semantics.In this paper, we show how a Cobol program can be efficiently transformed into a semantically-equivalent procedurally well-structured representation, in which conventional procedures (i.e., with the usual call and return semantics and without code sharing) and procedure call statements replace performed code and perform statements. This transformation process properly accounts for the non-procedural control flow that can result from ill-behaved perform statements.The program representation derived from our analysis can be used directly in program understanding applications, program restructuring tools, and inter-language translators. In addition, it can be used as the starting point for a variety of context-sensitive program analyses, e.g., program slicing.
Starting Page 1
Ending Page 10
Page Count 10
File Format PDF
ISBN 1581131372
DOI 10.1145/316158.316163
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 1999-09-06
Publisher Place New York
Access Restriction Subscribed
Content Type Text
Resource Type Article
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