CSC/ECE 517 Fall 2014/OSS M1450 vda

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Implement Window.sessionStorage

This wiki page contains details on the work done for the initial step of the task Implement Window.sessionStorage for the Mozilla research project Servo.

Introduction

Rust

Rust is a modern systems programming language focusing on safety and speed to build reliable and efficient systems <ref> http://doc.rust-lang.org/nightly/intro.html </ref>. It accomplishes the goals of memory safe without using garbage collection and it supports concurrency and parallelism in building platforms.

Rust’s lightweight task mechanism also promises to allow fine-grained isolation between browser components, such as tabs and extensions, without the need for expensive runtime protection schemes, like operating system process isolation. <ref> https://www.mozilla.org/en-US/research/projects/ </ref>

Servo

Mozilla Research team is currently working on an experimental project to develop a new Web browser engine "Servo", that is capable of supporting a variety of current and next generation of hardware like mobile devices, multi-core processors and high-performance GPUs. Servo builds on top of Rust to provide a secure and reliable foundation. It is currently developed on 64 bit devices.<ref> https://www.mozilla.org/en-US/research/projects/ </ref>

The main objectives of this experimentation project is improving the layout to graphics rendering - to optimize for power efficiency and maximize parallelism. <ref> https://www.mozilla.org/en-US/research/projects/ </ref>

Developer Environment Setup <ref>https://github.com/servo/servo/blob/master/README.md</ref>

Installing Required Packages for Servo

On OS X (homebrew): 

brew install automake pkg-config python glfw3 cmake
pip install virtualenv

On OS X (MacPorts): 

sudo port install python27 py27-virtualenv cmake

On Debian-based Linuxes: 

sudo apt-get install curl freeglut3-dev \
    libfreetype6-dev libgl1-mesa-dri libglib2.0-dev xorg-dev \
    msttcorefonts gperf g++ cmake python-virtualenv \
    libssl-dev libglfw-dev

On Fedora: 

sudo yum install curl freeglut-devel libtool gcc-c++ libXi-devel \
    freetype-devel mesa-libGL-devel glib2-devel libX11-devel libXrandr-devel gperf \
    fontconfig-devel cabextract ttmkfdir python python-virtualenv expat-devel \
    rpm-build openssl-devel glfw-devel cmake
pushd .
cd /tmp
wget http://corefonts.sourceforge.net/msttcorefonts-2.5-1.spec
rpmbuild -bb msttcorefonts-2.5-1.spec
sudo yum install $HOME/rpmbuild/RPMS/noarch/msttcorefonts-2.5-1.noarch.rpm
popd

On Arch Linux: 

sudo pacman -S base-devel git python2 python2-virtualenv mesa glfw ttf-font cmake

Building Servo

Clone the Servo repository hosted at https://github.com/servo/servo and switch to the servo directory. 

git clone https://github.com/servo/servo
cd servo

Normal Build 

./mach build

Building for Android target 

ANDROID_TOOLCHAIN=/path/to/toolchain ANDROID_NDK=/path/to/ndk PATH=$PATH:/path/to/toolchain/bin ./mach build --android
cd ports/android
ANDROID_SDK=/path/to/sdk make install

Note: Building the servo browser engine will take a considerable amount of time.

Launch Servo

Once the build is successful, launch Servo using this command. 

./mach run tests/html/about-mozilla.html

Project Description

Implementation

In order to create the Storage inteface and its stub implementation, we made the following changes:

  • Created a new file called Storage.webidl under the folder components/script/dom/webidls.
  • Added the method definitions in the above interface file.
  • Created another file called storage.rs under the specified folder components/script/dom.
  • Added constructor for Storage object and stub implementations of the methods defined in the above mentioned interface file.
  • Added our module entry in the file components/script/lib.rs so that our files are compiled as part of the Servo build.
  • Built the Servo once again and verified that the Servo browser was launching correctly.

Future Work <ref> https://github.com/servo/servo/wiki/Storage-student-project </ref>

  • Create the WindowSessionStorage interface making it return a Storage instance.
  • Create a Storage task which will be used to contain all stored data.
  • Define a message-passing interface for reading and writing stored data for a particular browser tab.
  • Use the Storage task in the implementation of Storage.
  • When the value of a stored data is changed, notify its respective browser tab.
  • Pass as many tests as possible.
  • Implement the WindowLocalStorage interface which behaves slightly different from the WindowSessionStorage interface.

Further Readings

Design and Architecture of Servo: http://github.com/servo/servo/wiki/Design/
Learning Rust by Examples: http://rustbyexample.com/
Javascript as Servo's Garbage Collector: http://blog.mozilla.org/research/2014/08/26/javascript-servos-only-garbage-collector/

References

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