8. Hacking OpenJDK | OpenJDK Cookbook

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OpenJDK Cookbook

By : Kobylyanskiy, Mironchenko

4 (2)

OpenJDK Cookbook

4 (2)

By: Kobylyanskiy, Mironchenko

Overview of this book

If you are an experienced Java developer using Java 7 platform and want to get your grips on OpenJDK for Java development, this is the book for you. JDK users who wish to migrate to OpenJDK will find this book very useful.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Sections

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with OpenJDK

1. Getting Started with OpenJDK

Introduction

Distinguishing OpenJDK from Oracle JDK

Installing OpenJDK on Windows

Configuring OpenJDK on Windows

Installing OpenJDK on Linux

Configuring OpenJDK on Linux

Navigating through OpenJDK groups and projects

2. Building OpenJDK 6

2. Building OpenJDK 6

Introduction

Preparing CA certificates

Building OpenJDK 6 on Ubuntu Linux 12.04 LTS

Setting up the minimum build environment for the most compatible Linux builds

Installing Cygwin for Windows builds

Building 32-bit FreeType libraries for OpenJDK 6 on Windows

Building 64-bit FreeType libraries for OpenJDK 6 on Windows

Building 32-bit OpenJDK 6 on Windows 7 SP1

Building 64-bit OpenJDK 6 on Windows 7 x64 SP1

3. Building OpenJDK 7

3. Building OpenJDK 7

Introduction

Building OpenJDK 7 on Ubuntu Linux 12.04 LTS

Building OpenJDK 7 on Mac OS X

Building 32-bit FreeType libraries for OpenJDK 7 on Windows

Building 64-bit FreeType libraries for OpenJDK 7 on Windows

Building 32-bit OpenJDK 7 on Windows 7 SP1

Building 64-bit OpenJDK 7 on Windows 7 x64 SP1

Preparing a standalone toolchain for 32- and 64-bit Windows' builds

4. Building OpenJDK 8

4. Building OpenJDK 8

Introduction

Working with GNU Autoconf

Building OpenJDK 8 Ubuntu Linux 12.04 LTS

Using ccache to speed up the OpenJDK 8 build process

Building OpenJDK 8 on Mac OS X

Building OpenJDK 8 on Windows 7 SP1

5. Building IcedTea

5. Building IcedTea

Introduction

Building IcedTea 6

Building IcedTea 7

Building OpenJDK 7 with IcedTea patches

Building IcedTea 7 with the NSS security provider

Building IcedTea 6 with the SystemTap support

6. Building IcedTea with Other VM Implementations

6. Building IcedTea with Other VM Implementations

Introduction

Configuring cross-compilation between ARM and x86

Building IcedTea for ARM with integrated CACAO VM

Porting JamVM to use OpenJDK

Configuring Zero-assembler with the Shark compiler to use OpenJDK

Building for MIPS and other architectures using OpenEmbedded recipes

7. Working with WebStart and the Browser Plugin

7. Working with WebStart and the Browser Plugin

Introduction

Building the IcedTea browser plugin on Linux

Using the IcedTea Java WebStart implementation on Linux

Preparing the IcedTea Java WebStart implementation for Mac OS X

Preparing the IcedTea Java WebStart implementation for Windows

8. Hacking OpenJDK

8. Hacking OpenJDK

Introduction

Setting up the development environment with NetBeans

Working with Mercurial forest

Understanding OpenJDK 6 and 7 incremental builds

Debugging Java code using NetBeans

Debugging C++ code using NetBeans

Using NetBeans to compile HotSpot

Using HotSpot dev parameters

Adding new intrinsic to HotSpot

Building VisualVM from the source code

Creating a plugin for VisualVM

Getting benefits from the AdoptOpenJDK project

9. Testing OpenJDK

9. Testing OpenJDK

Introduction

Running tests using the downloaded or the built version of jtreg

Building jtreg from the source

Running the standard set of OpenJDK tests

Writing your own test for jtreg

Using jtreg in GUI mode

Writing TestNG tests for jtreg

Compiling JT Harness from the source code

Building and running jcstress

Writing tests for jcstress

Creating a benchmark project using JMH

Downloading the source and compiling JHM

10. Contributing to OpenJDK

10. Contributing to OpenJDK

Introduction

Becoming a contributor

Generating a patch with webrev

Backporting OpenJDK v9 patches to OpenJDK v8

Understanding OpenJDK groups

Understanding OpenJDK projects

Suggesting new JSRs

Suggesting new JEPs

11. Troubleshooting

11. Troubleshooting

Introduction

Navigating through the process workflow

Submitting a defect to the OpenJDK bug systems

Creating a patch using NetBeans

Creating a code review

12. Working with Future Technologies

12. Working with Future Technologies

Introduction

Building OpenJDK 9 on Mac OS X using Clang

Building OpenJDK 9 on Windows using MSYS

Running and testing the early access preview of OpenJDK 9

Using Jigsaw

Building OpenJDK 9 with Graal

Building OpenJDK 9 with Sumatra

13. Build Automation

13. Build Automation

Introduction

Installing VirtualBox

Preparing SSH keys

Preparing VirtualBox machines with Linux

Preparing VirtualBox machines with Mac OS X

Preparing VirtualBox machines with Windows

Automating builds

Building cross-platform installers

Index

Index

Understanding OpenJDK 6 and 7 incremental builds

The process of OpenJDK compilation is very time consuming. It is very boring, especially when one is developing a small part of the whole project, which needs full recompilation for testing purposes. To do it in a simple way and to compile only the necessary parts, there are incremental builds.

Getting ready

We need to download the OpenJDK (6 or 7) source code. You may need libmotif installed. Windows users may need to install Cygwin.

How to do it...

We will see how OpenJDK is built incrementally, avoiding adding any nasty bugs.

First, let's build OpenJDK for the first time:
```
make all
```
This will take some time, so have a cup of tea.
Then, we will build it for the second time:
```
make all
```
You can see from the input that nothing was actually built.
Then, let's insignificantly change some source file (for example, cardTableModRefBS.cpp).
Let's make OpenJDK again, but this time we will grep the output:
```
make all | grep -i .cpp
```
We see that, in the output, only...

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