TinyJVM

A Java virtual machine implemented in python

How to run

pip install -r requirements.txt

python ./ your_class_path/your_class.class

or

python ./ -jar your_jar_path/your_jar.jar

help:

python ./ -h

help

usage: [-h] [-v] [-cp [CLASSPATH [CLASSPATH ...]]] [-jh JAVAHOME] [-jar JAR] [main_class]

positional arguments:

• main_class java class to execute

optional arguments:

• -h, --help show this help message and exit

• -v, -version print product version and exit

• -cp [CLASSPATH [CLASSPATH ...]], -classpath [CLASSPATH [CLASSPATH ...]] <class search path of directories and zip/jar files>, default: [current directory]

• -jh JAVAHOME, -javahome JAVAHOME java home path, default: $JAVA_HOME

• -jar JAR jar to execute

turn on/off debug output

modify debug.py:

DEBUG = True

Feature

• class loader(.class/.jar)
• instructions: 190+/202
• interpreter
• array
• verify
• native method
• exceptions
• multithreading
• gc

Reference

• The Java® Virtual Machine Specification

• jvmgo-book