Tamarin

Tamarin-Tracing (прежнее название QVM) - экспериментальная версия виртуальной машины Tamarin для JavaScript (изначально написаная в Adobe для ActionScript 3 внутри Flash/Flex, переданная в Mozilla в качестве нового JS).

• Tamarin-Tracing: Mozilla’s New VM for ECMAScript 4
• Parts of QVM "tamarin-tracing" are *written in the Forth programming language* because you are create really efficient VMs in 50K of memory runable on just about any device available today.
• This branch modifies tamarin to use a trace-based optimizer rather than a conventional just-in-time compiler. Trace optimization is a technique which holds promise for optimizing *untyped* javascript code, and doing so with a small memory footprint.
• QVM has an additional "low-level bytecode" that it uses internally. Each Tamarin bytecode is equivalent to one or more low-level bytecodes. That's where Forth comes in.
• http://www.mozilla.org/projects/tamarin/
• http://hg.mozilla.org/tamarin-tracing/
• Обсуждение нв fforum'e
• http://www.bluishcoder.co.nz/2008/02/quick-introduction-to-tamarin-tracing.html