Have a great goal is a very important thing, such as Moon Landing. What is the meaning of this plan? That's the process of achieving this goal, the produce of industry and technology.

Sun is a great company, in the era of C++, they created JVM & HotSpot.

Now, we have Rust, a better tool, let’s remake JVM!

Pay tribute to medical workers at the front! Thank you for your contribution to the fight against the epidemic.

Roadmap

• Pass test cases in JDK
• Pass TCK
• GC (crate)
• JIT / interp (crate)
• class verification (crate)
• After GC built, ready for optimize System.arraycopy (the key of performance)
• WebAssembly, make the JVM work in Browser
• java options (-version, -server...)

In summary, the roadmap is built on a 3-step progress.

• Pass TCK
• Refactor & Rewrite
• Divide into several crates, build a collection of modular and reusable vm technologies

Well, it's a long term plan, Sun spent 30 years to improve VM, Oracle continue doing it.

The journey of a thousand miles begins with one first step. Even the sage was once an ordinary human being.

Just Do It.

Running

# setup JDK
# setup rust toolchain
# clone this project

# compile sample by javac
cd jvm/sample
javac HelloWorld.java
cd ..

# modify r.sh JAVA_HOME according to your env
# exec sample
cd jvm
bash r.sh