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Package Description
The debug package contains a debugger API that can be used to install breakpoints, step through and control the execution of Truffle guest language applications.
The instrumentation API provides a way to introspect and inject behavior into interpreters written using the Truffle framework.
This package provides inter-operability between different Truffle languages.
Helper methods to simplify co-operation of Java and Truffle objects.
Domain specific language for using the Truffle dynamic object storage model to create classic class hierarchies.
A profile is a Truffle utility class that uses the Truffle compiler directives to guard for and/or forward runtime information to the compiler.
Represents a source file.
The execution engine for all Truffle-implemented languages.
To Review 
Package Description
Do you want to implement your own Truffle based language? In such case start here.
Representation of a stack frame.
Abstract syntax tree nodes are the basic building block for your TruffleLanguage.
Dynamic object storage model.
Various utility classes that aim to make the development of TruffleLanguage guest languages easier.
Test Compatibility Kit 
Package Description
Include implementation of TruffleTCK in your test suite to verify your language implementation is compliant.
Provide an implementation of the LanguageProvider to test language inter-operability.
Other Packages 
Package Description
The metadata package provides scope APIs related to declared guest language variables.
The Graal-SDK collections package contains memory efficient data structures.
The Graal-SDK options package contains reusable collection classes for options.
The Graal-SDK polyglot API allows to embed Graal languages in Java applications.
The Graal SDK proxy interfaces allow to mimic guest language objects, arrays, executables, primitives and native objects in Graal languages.
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