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https://github.com/shudo/shujit

Java Just-in-Time Compiler for x86 processors
https://github.com/shudo/shujit

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Java Just-in-Time Compiler for x86 processors

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README 

        
shuJIT - a JIT compiler for x86

	http://www.shudo.net/jit/

	Kazuyuki Shudo 



* What this is



ShuJIT is a Java Just-in-Time compiler for Sun Microsystems' Classic VM

(i.e. JDK, Java 2 SDK, JRE) and Intel x86 processors.

It supports FreeBSD, Linux and NetBSD.



* Platforms



Working on the following platforms is confirmed.



- FreeBSD

  - JDK 1.3.1 patchlevel 8, GCC 2.95.4 and FreeBSD 4.9-STABLE

  - JDK 1.1.8 (ELF, V1999-11-9), GCC 2.95.4 and FreeBSD 4.9-STABLE



- Linux

  - Blackdown JDK 1.3.1_02b, GCC 3.3.2 20031022, glibc 2.3.2

    and Linux 2.6.0-test9

  - JDK 1.1.8v3, GCC 3.3.2 20031022, glibc 2.3.2 and Linux 2.6.0-test9

  - JDK 1.1.7v1a, egcs 1.1.2, libc 5.4.38 and Linux 2.0.35



* Installation



With Java 2, you have to place the libshujit.so in

jdk1.X.X/jre/lib/i386/ or make a symbolic link in the path.



With JDK 1.1.X, copy the libshujit.so to a path in LD_LIBRARY_PATH

variable or the path on which libjava.so exists

(ex. /usr/local/jdk1.1.8/lib/i686/green_threads/).



* Run Java programs with shuJIT



Type instead of usual java command

  % java -Djava.compiler=shujit ...



or set JAVA_COMPILER variable to `shujit'.

  If you use C shell compatible shells, type

    % setenv JAVA_COMPILER shujit

  If you use bourne shell compatible shells, type

    % export JAVA_COMPILER=shujit



* Compilation



You need the following tools to compile shuJIT.



- JDK 1.3.X, 1.2.X or 1.1.X Classic VM

  ShuJIT works with Sun's Classic VM which these JDKs contain.

  Other JVMs, i.e. IBM JDK and HotSpot VMs, are not supported.

- GCC 3.X, 2.9X or egcs

  You can examine the version number of your GCC with -v option.

    % gcc -v

  GCC 2.7.X cannot compile shuJIT correctly.

- objdump (in GNU binutils)

  Most Linux distributions and ELF FreeBSD systems have this.

- Ruby

  A script which generate some tables is written in Ruby.

  See http://www.ruby-lang.org/

- GNU make



  1. Run configure script.

       % ./configure

     If you want to use SSE2 instructions of Pentium 4 processor, type

       % ./configure --enable-sse2

  2. Type `make'. You will get libshujit.so

       % make

     Or, on FreeBSD systems

       % gmake

     Type `make debug' to obtain libshujit_g.so, which is for debugging.



* Bugs and Problems



Any comments and bug reports are welcome. Please feel easy to write to me.



* Copying



This software is a free software which is copyrighted by Kazuyuki

Shudo. You may redistribute and modify it under the terms of GNU

Lesser General Public License; either version 2.1 of the License, or

any later version. See LGPL.txt for more details.



* Thanks



Thanks all folks around me and especially the following people:



Takuzo O'hara                 (compilation on FreeBSD)

Hideaki Takahashi                  (bug report and debug)

Keishiro Tanaka                   (test on FreeBSD)

Ryo Neyama                                (test on Linux)

Toshitaka Miura                 (preparation of FreeBSD)

Jun'ya Kato            (preparation of FreeBSD)

Fuyuhiko Maruyama            (discussion and code)

Toshihiko Shimokawa      (preparetion of FreeBSD)

Keizo Maeda                                    (porting)

and my deceased wife Mari.



Kazuyuki Shudo/首藤一幸   私をたばねないで あらせいとうの花のように

  shudo at computer.org   http://www.shudo.net/