Type of Document Master's Thesis Author Kothapalli, Malini Author's Email Address email@example.com URN etd-12062003-115402 Title Automated Conversion of Structured Fortran 77 code Into Object-Oriented C++ Code Degree Master of Science Department Computer Science Advisory Committee
Advisor Name Title Bohn, Jan Helge Committee Chair Arthur, James D. Committee Co-Chair Edwards, Stephen H. Committee Member Keywords
- automated conversion
- legacy code
Date of Defense 2003-05-08 Availability unrestricted AbstractThe maintenance of legacy software systems that were developed using a procedural
design approach is becoming increasingly expensive. The procedural approach is often
ill suited for complex systems that need to integrate with other codes. Furthermore, these
legacy systems are usually written in FORTRAN, for which there is increasingly less
personnel available compared to, say, C++. While it would be desirable to convert these
legacy systems into object-oriented codes described in C++, such a conversion process is
nontrivial. Currently, the structural design must be manually examined, interpreted, and
converted into an object-oriented design described in an object-oriented language.
Therefore, the conversion process is likely to introduce numerous new inconsistencies
and errors, which degrades the software's quality and increases its costs.
The preferred solution would be to automate this conversion process. Automation
would promote consistency by eliminating the manual variations in interpretation and
implementation. It would therefore maximize the likelihood that the converted code does
not introduce new errors relative to the original code.
The work presented here automates the conversion process from procedural
design described in the FORTRAN77 language into object-oriented design described in
the C++ language. It demonstrates the extraction of object-oriented elements using
FORTRAN common block structures and FORTRAN subroutine and function-calling
hierarchies. The result is a consistent, first-cut converted design, which enhances cohesion within classes and reduces coupling between classes. This result is described in
the contemporary, broadly used computer language C++, which integrates with adjacent
modules that might still remain procedural and described in FORTRAN.
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