A tiny JVM (Java Virtual Machine) program written in TypeScript.
This virtual machine specification complaints Java Virtual Machine Specification (Java SE 8 Edition).

This project is for research purpose, and we are aiming at understanding the structure of JVM and proposing a new way to develop web frontends. For these reason, we will not accept any PRs targeting codes in this repository. As a result of this project, this VM will support all features of JVM defined at the specification.

1. Open index.html on Browser.
2. Select a *.class file.
3. Open "Developer Tool" and open "Console" tab.

const buffer: ArrayBuffer = new ArrayBuffer();  // Binary data of the class file;
const jvm = new JVM(buffer);
jvm.load();  // Load class file and invoke main method.

• Some of primitive/reference types
  • int/long/float/double values, variables
    • addition/subtraction/multiply/division/shl/shr
    • String type
  • String
    • sum of String (by StringBuilder)
• Print "Hello, World!"
  • System.out.println("Hello, World!");
• Fizz Buzz problem
  • If statement
  • For statement

• Java Virtual Machine Specification (Java 8 Edition)
• PHPでJVMを実装してHello Worldを出力するまで (How to implement JVM in PHP and print "Hello, World".)
• バイトコード (ByteCode)
• JVM Stacks and Stack Frames
• Hotspot JVMのFrameについて (About Frame on Hotspot JVM)
• Use cases of jvm dup instruction (StackOverFlow)
• Java仮想マシン (Wikipedia)
• コンピュータシステムの理論と実装 / 訳: 齋藤 康毅 (The Elements of Computing Systems / Noam Nisan, Shimon Schocken)