MCI-java: a modified java virtual machine approach to multiple code inheritance

Authors:
Maria Cutumisu;Calvin Chan;Paul Lu;Duane Szafron
Affiliations:
Department of Computing Science, University of Alberta;Department of Computing Science, University of Alberta;Department of Computing Science, University of Alberta;Department of Computing Science, University of Alberta
Venue:
VM'04 Proceedings of the 3rd conference on Virtual Machine Research And Technology Symposium - Volume 3
Year:
2004

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Abstract

Java has multiple inheritance of interfaces, but only single inheritance of code via classes. This situation results in duplicated code in Java library classes and application code. We describe a generalization to the Java language syntax and the Java Virtual Machine (JVM) to support multiple inheritance of code, called MCI-Java. Our approach places multiply-inherited code in a new language construct called an implementation, which lies between an interface and a class in the inheritance hierarchy. MCI-Java does not support multiply-inherited data, which can cause modeling and performance problems. The MCI-Java extension is implemented by making minimal changes to the Java syntax, small changes to a compiler (IBM Jikes), and modest localized changes to a JVM (SUN JDK 1.2.2). The JVM changes result in no measurable performance overhead in real applications.