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Dept of Computer & Information Sciences University of Delaware

Dept of Computer & Information Sciences University of Delaware. JikesRVM. Contents. Introduction to JikesRVM Optimizations IRs (Intermediate Representations) Modifying the JikesRVM Steps For Project1 Questions. Introduction to JikesRVM. This is not a Java source compiler.

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Dept of Computer & Information Sciences University of Delaware

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  1. Dept of Computer & Information Sciences University of Delaware JikesRVM

  2. Contents • Introduction to JikesRVM • Optimizations • IRs (Intermediate Representations) • Modifying the JikesRVM • Steps For Project1 • Questions

  3. Introduction to JikesRVM • This is not a Java source compiler. • JikesRVM is a Virtual Machine. • Converts from Byte code  Machine Code

  4. Introduction to JikesRVM • Functions of the RVM • Loads class files when needed • Converts the class files (OS independent bytecode) to machine code (OS and Architecture dependent) • Optimizes byte code in the process of the above conversion. • Tracks Compilation time and provides rudimentary profiling.

  5. Compiling Jikes • Download the gz file from source forge http://downloads.sourceforge.net/jikesrvm/jikesrvm-3.0.1.tar.gz?use_mirror=superb-westby using the command wget <web link> • Untar the file “tar –zxf jikesrvm-3.0.1.tar.bz2” • Inside the jikesrvm directory create a new .ant.properties file (http://www.cis.udel.edu/~skulkarn/ta_files/.ant.properties ) • Run command “java-config -s sun-jdk-1.6” • Inside this directory run “ant” and this would create the executable image of the rvm. • Binaries are stored in (jikesrvm-3.0.1/dist/FastAdaptiveGenMS_x86_64-linux) folder • Compile your source code with the javac command and run using the “rvm” binary present in the above folder. • You may want to add this directory to the PATH environment variable.

  6. Optimization • Levels of Optimization: O0 to O3. • List of optimizations (http://www.cis.udel.edu/~skulkarn/ta_files/OptLevels.tar.gz ) • Number of steps in an optimization level:

  7. Intermediate Representations

  8. Important source directories • Package responsible for choosing the optimizations is org.jikesrvm.compilers.opt.driver • OptimizationPlanner.java: is responsible for creating the list of optimizations that the code would go through. • CompilationPlan.java: Performs those optimizations in the order that was set in OptimizationPlanner. • Actuall implementations of the optimizations can be found under the root package org.jikesrvm.compilers.opt e.g. LocalCastOptimization.java is the implementation LocalCastOptimization.

  9. Modifying the JikesRVM • Adding of a new command line argument • Directory “jikesrvm-3.0.0/rvm/src-generated/options” • Change ValueOptions.opt.dat or BooleanOptions.opt.dat • Remember that the number of new lines also are important. So do not upset those. • You will have to clean the previous build by using “ant very-clean” command • Build again by “ant” command.

  10. Steps for Project1 • Based on the steps provided on the class website: • Step1: Writing a Java Code. • Step2: Screenshot of running the RVM. • Step3: use “time rvm <command line parameters>” to count the time taken. • Step4: Turn off optimizations and compare the resulting running time.

  11. Questions? Most of the files and this presentation is available at http://www.cis.udel.edu/~skulkarn/ta.html

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