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| <a href="http://llvm.org/">LLVM Home</a> | |
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| <label>VMKit Info</label> | |
| <a href="index.html">About</a> | |
| <a href="get_started.html">Get Started</a> | |
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| <label>Quick Links</label> | |
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| <a href="http://llvm.org/devmtg/">August 1, 2008 - LLVM/Clang Developer Meeting</a> | |
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| <!--*********************************************************************--> | |
| <h1>VMKit: JVM and .Net runtimes for LLVM</h1> | |
| <!--*********************************************************************--> | |
| <p>The VMKit project is an implementation of a JVM and CLI virtual machine | |
| (.Net is an implementation of the CLI). It translates Java bytecode and | |
| MSIL in the LLVM IR and uses the LLVM framework for optimizations and just | |
| in time compilation. You can <a href="get_started.html">get and build</a> the | |
| source today.</p> | |
| <!--=====================================================================--> | |
| <h2 id="goals">Features and Goals</h2> | |
| <!--=====================================================================--> | |
| <p>Some of the goals for the project include the following:</p> | |
| <p><b>End-User Features</b>:</p> | |
| <ul> | |
| <li>Virtual machine interoperability</li> | |
| <li>Experiment virtual machine technologies with a small code base</li> | |
| <li>Very fast on CPU-intensive applications</li> | |
| </ul> | |
| <p><b>Utility and Applications</a></b>:</p> | |
| <ul> | |
| <li>Infrastructure for virtual machine development</li> | |
| <li>Use the LLVM 'BSD' License</li> | |
| </ul> | |
| <p><b>Internal Design and Implementation</b>:</p> | |
| <ul> | |
| <li>Real-world, production quality virtual machines (the JVM runs Tomcat)</li> | |
| <li>A simple and hackable code base</li> | |
| <li>Execute virtual machines in the same environment</li> | |
| </ul> | |
| <!--=====================================================================--> | |
| <h2>Why?</h2> | |
| <!--=====================================================================--> | |
| <p>The development of VMKit was started out of a need to factorize virtual | |
| machine development. The JVM and CLI virtual machine have many | |
| similarities, but are too high-level to be the basis of a "universal" | |
| virtual machine. The LLVM IR on the opposite is low-level enough to be | |
| able to execute these VMs. VMKit is a proof of concept implementation | |
| towards that direction.</p> | |
| <p>An introduction to VMKit can be found in the following video lectures: | |
| <ul> | |
| <li><a href="http://llvm.org/devmtg/2008-08/Geoffray_VMKitProject_Lo.3gp"> | |
| Presentation of VMKit at the 2008 LLVM Developer's Meeting</a> | |
| </li> | |
| </ul> | |
| </p> | |
| <p>A port of VMKit to use the Boehm GC can be found in the following paper: | |
| <ul> | |
| <li><a href="ladyvm.html">LadyVM as a port of VMKit to Boehm's GC</a> | |
| </li> | |
| </ul> | |
| <p>For an example of what kind of experimental technologies we can | |
| implement in a timely fashion with VMKit:</p> | |
| <ul> | |
| <li><a href="osgi.html">Isolation in OSGi with VMKit</a> | |
| </li> | |
| </ul> | |
| <!--=====================================================================--> | |
| <h2>Current Status</h2> | |
| <!--=====================================================================--> | |
| <p>VMKit is still in its early development stages. If you are looking to | |
| experiment virtual machine technologies, VMKit is probably a great solution | |
| for you. If you want to use it as a drop in JVM or .Net, it is not yet | |
| ready.</p> | |
| <p>VMKit currently has a decent implementation of the JVM. It executes | |
| Apache projects (e.g. OSGi Felix and Tomcat) and the SPECJVM98 benchmark. | |
| The CLI implementation is still in its early stages, but can execute | |
| simple applications.</p> | |
| <p>The JVM has been tested on Linux/x64, Linux/x86, Linux/ppc32, MacOSX/x64, | |
| MacOSX/x86, MacOSX/ppc32. The JVM may work on ppc64. Support for | |
| Windows has not been investigated | |
| </p> | |
| <!--=====================================================================--> | |
| <h2>Get it and get involved!</h2> | |
| <!--=====================================================================--> | |
| <p>Start by <a href="get_started.html">getting the code, building it, and | |
| playing with it</a>. This will show you the sorts of things we can do | |
| today.</p> | |
| <p>Once you've done that, please consider <a href="get_involved.html">getting | |
| involved in the VMKit community</a>. Currently, VMKit is tightly | |
| integrated into the llvm community. You can sign up for the llvm mailing | |
| list to ask and learn about how the project works.</p> | |
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