Implementing Jalapeno in Java

Jalapeno is a virtual machine for Java^TM servers written in Java. A running Java program involves four layers of functionality: the user code, the virtual-machine, the operating system, and the hardware. By drawing the Java / non-Java boundary below the virtual machine rather than above it, Jalapeno reduces the boundary-crossing overhead and opens up more opportunities for optimization. To get Jalapeno started, a boot image of a working Jalapeno virtual machine is concocted and written to a file. Later, this file can be loaded into memory and executed. Because the boot image consists entirely of Java objects, it can be concocted by a Java program that runs in anyJVM. This program uses reflection to convert the boot image into Jalapenoʹs object format. A special MAGIC class allows unsafe casts and direct access to the hardware. Methods of this class are recognized by Jalapenoʹs three compilers, which ignore their bytecodes and emit special-purpose machine code. User code will not be allowed to call MAGIC methods so Javaʹs integrity is preserved. A small non-Java program is used to start up a boot image and as an interface to the operating system. Javaʹs programming features - object orientation, type safety, automatic memory management - greatly facilitated development of Jalapeno. However, we also discovered some of the langaugeʹs limitations.