OpenJIT—A Reflective Java JIT Compiler

The so-called ‘Open Compilers’ is a technique to incorporate various self-descriptive modules for language customization and optimization based on computational reflection. We apply the open compiler technique to a Java Just-In-Time compiler to develop the OpenJIT compiler, which allows class-specific customization and optimization, fostering research of new compilation techniques such as application-specific customization and dynamic optimizations. Benchmarks with the current prototype, which is almost entirely written in Java, have seen comparable benchmark results compared to traditional C-based JIT compilers.