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JWebAssembly

Build Status License

JWebAssembly is a Java to WebAssembly Compiler. It uses Java class files as input.

Status of the project

Finished Components

  • Java byte code parser
  • test framework
  • Public API of the Compiler

Partially Finished

  • Binary format file writer (121 of 201 byte code instructions)
  • Text format file writer (121 of 201 byte code instructions)

Open Features

  • Exception handling - required the next version of WebAssembly
  • Multiple threads - required the next version of WebAssembly
  • Memory Management - required the next version of WebAssembly
  • Gradle plugin to easy integrate it in the build process
  • Eclipse build command to see compiler errors in in the IDE.

Required Java Version

JWebAssembly requires Java SE 8 or higher. It is tested with Java SE 8 on travis-ci.org.

Usage

Exporting functions

To export a Java function to make it accessible from JavaScript you need add the annotation org.webassembly.annotation.Export

import org.webassembly.annotation.Export;

@Export
public static int add( int a, int b ) {
    return a + b;
}

Java Limits

In version 1 of WebAssembly you can only compile:

  • static methods
  • use the data types int, long float and double

Alternatives