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Jato: a simple JIT-only virtual machine for Java
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What is it? Jato is a Java virtual machine implementation with a Just-in-time (JIT) compiler. It can currently run some simple Java programs on Linux/i386. How can I try it out? - Download development tree: $ git clone git://git.kernel.org/pub/scm/java/jato/jato.git - Make sure you have necessary dependencies installed to compile the program. For Ubuntu: $ sudo apt-get install ecj classpath libffi-dev binutils-dev libzip-dev libglib2.0-dev valgrind For Fedora: $ su $ yum install eclipse-ecj ; exit and $ wget ftp://ftp.gnu.org/gnu/classpath/classpath-0.97.2.tar.gz $ tar xzvf classpath-0.97.2.tar.gz $ cd classpath-0.97.2 $ ./configure ; make $ su $ make install ; exit For OpenSolaris 10: $ su $ pkg install SUNWgnome-common-devel SUNWgcc SUNWGlib SUNWgmake SUNWbison ; exit For Archlinux: $ pacman -S eclipse-ecj classpath libzip libffi - Compile Jato and run the unit tests: $ cd <JATO_ROOT> ; make Running Jato Command line options: -Xtrace:invoke Trace method invocations. -Xtrace:invoke-verbose Trace method invocations (verbose mode). -Xtrace:jit Trace all compilation phases for each method. -Xtrace:asm Trace the emitted machine code for each method. -Xtrace:classloader Trace class loading and initialization. -Xtrace:trampoline Trace executed trampolines. Development If you use git for development, please remember to add your committer name and email to .git/config file. You can do that by running the following commands: $ git config user.name "Pekka Enberg" $ git config user.email penberg@cs.helsinki.fi How to run the regression test suite? Installation prerequisites: - Eclipse Compiler for Java (ECJ) - GNU classpath installed in '/usr/local/classpath/' To run the test suite, execute the following commands: $ make check How do I launch a simple application? To run a simple Java application, you can download Christian Schneider's Java tetris at: http://www.liquidreality.de/display/liquid/Java+Tris and launch it with the following command: $ jato -jar tetris.jar To launch the application under gdb, use the following command: $ gdb --args ./jato [...] Debugging deadlocks You can debug deadlocks easily with GDB: $ gdb --args ./jato [...] (gdb) handle SIGSEGV nostop (gdb) r <Ctrl-C when the program deadlocks> (gdb) thread apply all backtrace Copyright and License Copyright (C) 2005-2009 Pekka Enberg Jato is available under the GNU General Public License (GPL) version 2 with the following clarification and special exception: Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. Acknowledgements I would like to thank the following people and organizations for supporting Jato development: Reaktor Innovations Oy for sponsoring initial Jato development back in 2005. Kernel.org for providing git hosting for Jato. Google for including Jato in Summer of Code 2008 and 2009. Thank you!
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