Description

The JGo Project aims to provide a complete compiler and runtime environment for the Go programming language to/on the Java Virtual Machine. The jgoc compiler is written in Scala and the runtime in Java.

Drone.io continuous integration service

Gitter Chat

Why the JVM?

The selection of the JVM was motivated by:

Compatibility & JVM debug/profiling

A lot of excellent libraries are written for the JVM. JGo hopes to make existing Go users more productive by enabling them to use these. Furthermore, many groups have large codebases written in Java, Scala, and other JVM languages. JGo is an attempt to bring these groups into the fold, group and expose them.

Status of the Project

JGo is a work in progress. Many features of the Go programming language are not yet fully supported.

Currently, these include:

• Structs; (nearing completion)
• Methods;
• Packages and multi-file compilation;
• Interfaces;
• Lambda expressions;
• Closures (sub-feature of lambda expressions);
• Concurrency;
• defer, panic, and recover; and Switch statements.

DOCS

JGO-DOCS

Contribute

Contributing to JGO

JGO welcomes contributions, feel free to play and pull requests :)

Issues

Feel free to submit issues and enhancement requests.

Contributing

Please refer to each project's style guidelines and guidelines for submitting patches and additions. In general, we follow the "fork-and-pull" Git workflow.

1. Fork the repo on GitHub
2. Raise a issue on our issue tracker
3. Commit changes to a branch in your fork using the issue, eg: git commit -m "#1"
4. Pull request with your changes
5. Thank you o/

NOTE: Be sure to merge the latest from "upstream" before making a pull request!

This project contains a Ubuntu 12.04 Sandbox, a vagrant Vagrant- based Puppet development environment used for running and testing JGo with the OpenJDK 8 modules.

OpenJDK

JGO Uses OpenJDK 8.

Requirements

To use this, you must have the following items installed and working:

• VirtualBox
• Vagrant 1.7+

Usage

Initial Startup

To bring up the Puppet Sandbox environment, issue the following command:

vagrant up

Puppet will install Git and OpenJDK 8.

vagrant ssh

Run SBT

When the shell command for vagrant is ready run sbt

$ cd /opt/jgo/
$ sbt
Getting org.scala-sbt sbt 0.13.8 ...
[info] Set current project to jgo (in build file:/opt/jgo/)

> run hello.go package.class
[info] Updating {file:/opt/jgo/}jgo...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.

Run SBT Command

When the command line for sbt shows type run hello.go package.class This will compile and execute the following go code into the JDK8:

func say(msg string) {
	print msg
}
func main(args [4]string) {
	msg := "hello, world"
	say(msg)
	
	for i := 0; i < 10; i++ {
		print i
	}
}

Output:

> run hello.go package.class
[info] Updating {file:/opt/jgo/}jgo...
(...)
[info] Compiling 132 Scala sources and 17 Java sources to /opt/jgo/target/scala-2.10/classes...
(...)
[info] Running jgo.tools.compiler.Main hello.go package.class
LoadVar <msg: string>
PrintString
Decl <msg: string>
PushStr "hello, world"
StoreVar <msg: string>
LoadVar <msg: string>
InvokeFunction Function(say, func(string))
Decl <i: int>
PushInt 0, I32
StoreVar <i: int>
goto:  [cond of for 5]
Lbl top of for 5
LoadVar <i: int>
PrintNumeric I32
Lbl continue 5
Incr <i: int>, 1, I32
Lbl cond of for 5
LoadVar <i: int>
PushInt 10, I32
if < I32:  [top of for 5]
Lbl break 5
Undecl <i: int>
Undecl <msg: string>

License

GNU 3

GNU General Public License, version 3.

Project migrated from https://code.google.com/p/jgo/ by Harrison Klaperman.