Design, Implementation, and Evaluation of Optimizations in a Just-in-Time Compiler

The Java language incurs a runtime overhead for exception checks and object accesses without an interior pointer in order to ensure safety. It also requires type inclusion test, dynamic class loading, and dynamic method calls in order to ensure flexibility. A “JustIn-Time” (JIT) compiler generates native code from Java byte code at runtime. It must improve the runtime performance without compromising the safety and flexibility of the Java language. We designed and implemented effective optimizations for the JIT compiler, such as exception check elimination, common subexpression elimination, simple type inclusion test, method inlining, and resolution of dynamic method call. We evaluate the performance benefits of these optimizations based on various statistics collected using SPECjvm98 and two JavaSoft applications with byte code sizes ranging from 20000 to 280000 bytes. Each optimization contributes to an improvement in the performance of the programs.

• Type: Conference
• Year: 1999
• Where: JAVA
• Authors: Kazuaki Ishizaki, Motohiro Kawahito, Toshiaki Yasue, Mikio Takeuchi, Takeshi Ogasawara, Toshio Suganuma, Tamiya Onodera, Hideaki Komatsu, Toshio Nakatani
• Keywords: Dynamic Method Call, Exception Check, JAVA 1999, Programming Languages, Type Inclusion Test