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SchokoVM

Run tests

A java bytecode interpreter that was implemented by two students for the course on Abstract Machines at the TU Wien.

The name was inspired by cacao jvm.

Slides of our presentation: presentation.pdf

Working:

  • Load class and jar files.
  • All instructions except invokedynamic.
  • Objects/arrays.
  • Exceptions.
  • Native method calls.

Partially:

  • OpenJDK 11 Class Library (System.out.println works).
  • Some functions are still missing to use libjvm with java -XXaltjvm=.
  • Primitive garbage collection.

Not implemented:

  • Invokedynamic (String concatenation).
  • Multi-threading / synchronized.
  • Custom class loaders.
  • Bytecode verification.

Build and test

The repository contains run configurations for the CLion IDE.

Command line instructions:

mkdir build
cd build
cmake ..
make -j
ctest -j 12

Ctest uses the script compare.sh to compare SchokoVM to the system JDK.

Dependencies

  • Linux or macOS

  • OpenJDK 11:

    If CMake finds the wrong version, you can set the JAVA_HOME environment variable.

  • libzip, libdl, libffi

OpenJDK 11 sources

You can optionally download the source code for OpenJDK 11 with this script: cd jdk && ./download.sh. This is not necessary to compile the project.

Notes

Some bullet points about the jvm specification can be found in JvmSpecNotes.md.