Idioms in Ovm

The need to express important non.Java behaviors confronts the Ovm virtual machine framework no less than any other VM-in-Java project such as JikesRVM[1].2 Any such project needs mechanisms for the purpose, but different choices in the VM design affect the shape those mechanisms can take. In exploring how a component that makes nontrivial use of such mechanisms-the JMTk memory management toolkit-can be made to interoperate with Dvm and JikesRVM, some Dvm mechanisms have been both contributed to and borrowed from JikesRVM, and some remain distinct. We describe mechanisms we find useful in Dvm because of its design differences from JikcsRVM. We have developed idioms that use familiar Java syntax at the source level, and familiar, recognizable design patterns, for problems such as VM configurability that involve ad hoc techniques in prior work, and we transform the idioms to code without the indirection and inefficiency that would otherwise weigh against the familiar patterns.