multi-language framework for executing dynamic languages

 Truffle is a language abstract syntax tree interpreter which
 allow it to implement languages on top of the Graal framework.
 .
 To implement a language using Truffle you write an AST for your
 language and add methods to interpret (perform the action of) each
 node.
 .
 Graal is an Oracle project aiming to implement a high performance
 Java dynamic compiler and interpreter.