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Programming language: Rust
License: Mozilla Public License 2.0
Latest version: v0.22.0

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README

The Servo Parallel Browser Engine Project

Linux Build Status Changelog #228

Servo is a prototype web browser engine written in the Rust language. It is currently developed on 64-bit macOS, 64-bit Linux, 64-bit Windows, and Android.

Servo welcomes contribution from everyone. See [CONTRIBUTING.md](CONTRIBUTING.md) and [HACKING_QUICKSTART.md](docs/HACKING_QUICKSTART.md) for help getting started.

Visit the Servo Project page for news and guides.

Setting up your environment

Rustup.rs

Building servo requires rustup, version 1.8.0 or more recent. If you have an older version, run rustup self update.

To install on Windows, download and run rustup-init.exe then follow the onscreen instructions.

To install on other systems, run:

curl https://sh.rustup.rs -sSf | sh

This will also download the current stable version of Rust, which Servo won’t use. To skip that step, run instead:

curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none

See also Other installation methods

Other dependencies

Please select your operating system:

macOS

Xcode version 10.2 or above is recommended.

On macOS(Intel based or ARM based) (Homebrew)

NOTE: run these steps after you've cloned the project locally.

cd servo 
brew bundle install --file=etc/taskcluster/macos/Brewfile
brew bundle install --file=etc/taskcluster/macos/Brewfile-build
pip install virtualenv

On Debian-based distros

sudo apt install python3-virtualenv python3-pip
./mach bootstrap

If ./mach bootstrap doesn't work, file a bug, and, run the commands below:

sudo apt install git curl autoconf libx11-dev libfreetype6-dev libgl1-mesa-dri \
    libglib2.0-dev xorg-dev gperf g++ build-essential cmake libssl-dev \
    liblzma-dev libxmu6 libxmu-dev \
    libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev \
    libgles2-mesa-dev libegl1-mesa-dev libdbus-1-dev libharfbuzz-dev ccache \
    clang libunwind-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
    libgstreamer-plugins-bad1.0-dev autoconf2.13 llvm-dev

Additionally, you'll need a local copy of GStreamer with a version later than 16.2. You can place it in support/linux/gstreamer/gst, or run ./mach bootstrap-gstreamer to set it up. On Ubuntu 20.04LTS, you can use the system GStreamer if you install the necessary packages:

sudo apt install gstreamer1.0-nice gstreamer1.0-plugins-bad

If you are using Ubuntu 16.04 or Linux Mint 18, run export HARFBUZZ_SYS_NO_PKG_CONFIG=1 before building to avoid an error with harfbuzz.

If you get an undefined symbol error on gst_player_get_config try removing gir1.2-gst-plugins-bad-1.0 and all old versions of clang, see #22016.

On Fedora

sudo dnf install python3 python3-virtualenv python3-pip python3-devel
python3 ./mach bootstrap

If python3 ./mach bootstrap doesn't work, file a bug, and, run the commands below:

sudo dnf install curl libtool gcc-c++ libXi-devel libunwind-devel \
    freetype-devel mesa-libGL-devel mesa-libEGL-devel glib2-devel libX11-devel \
    libXrandr-devel gperf fontconfig-devel cabextract ttmkfdir  expat-devel \
    rpm-build openssl-devel cmake libX11-devel libXcursor-devel \
    libXmu-devel dbus-devel ncurses-devel harfbuzz-devel \
    ccache clang clang-libs python3-devel gstreamer1-devel \
    gstreamer1-plugins-base-devel gstreamer1-plugins-bad-free-devel autoconf213

On CentOS

sudo yum install python-virtualenv python-pip
./mach bootstrap

If ./mach bootstrap doesn't work, file a bug, and, run the commands below:

sudo yum install curl libtool gcc-c++ libXi-devel freetype-devel \
    mesa-libGL-devel mesa-libEGL-devel glib2-devel libX11-devel libXrandr-devel \
    gperf fontconfig-devel cabextract ttmkfdir python expat-devel rpm-build \
    openssl-devel cmake3 libXcursor-devel libXmu-devel \
    dbus-devel ncurses-devel python34 harfbuzz-devel \
    ccache clang clang-libs llvm-toolset-7

Build inside llvm-toolset and devtoolset:

scl enable devtoolset-7 llvm-toolset-7 bash

with the following environmental variables set:

export CMAKE=cmake3
export LIBCLANG_PATH=/opt/rh/llvm-toolset-7/root/usr/lib64

On openSUSE

sudo zypper install libX11-devel libexpat-devel Mesa-libEGL-devel Mesa-libGL-devel cabextract cmake \
    dbus-1-devel fontconfig-devel freetype-devel gcc-c++ git glib2-devel gperf \
    harfbuzz-devel libXcursor-devel libXi-devel libXmu-devel libXrandr-devel libopenssl-devel \
    python3-pip python3-virtualenv rpm-build ccache llvm-clang libclang autoconf213 gstreamer-devel \
    gstreamer-plugins-base-devel gstreamer-plugins-bad-devel

On Arch Linux

sudo pacman -S --needed base-devel git python python-virtualenv python-pip mesa cmake libxmu \
    pkg-config ttf-fira-sans harfbuzz ccache llvm clang autoconf2.13 gstreamer gstreamer-vaapi \
    gst-plugins-base gst-plugins-good gst-plugins-bad

On Gentoo Linux

sudo emerge net-misc/curl \
    media-libs/freetype media-libs/mesa dev-util/gperf \
    dev-python/virtualenv dev-python/pip dev-libs/openssl \
    media-libs/harfbuzz dev-util/ccache sys-libs/libunwind \
    x11-libs/libXmu x11-base/xorg-server sys-devel/clang \
    media-libs/gstreamer media-libs/gst-plugins-bad media-libs/gst-plugins-base

With the following environment variable set:

export LIBCLANG_PATH=$(llvm-config --prefix)/lib64

On nixOS Linux

nix-shell etc/shell.nix

You will need to run this in every shell before running mach.

On Windows (MSVC)

  1. Install Python 3.9 for Windows (https://www.python.org/downloads/release/python-392/). The Windows x86-64 MSI installer is fine. This is required in order to build the JavaScript engine, SpiderMonkey.

You will also need to set the PYTHON3 environment variable, e.g., to 'C:\Python39\python.exe' by doing:

setx PYTHON3 "C:\Python39\python.exe" /m

The /m will set it system-wide for all future command windows.

  1. Install virtualenv.

In a normal Windows Shell (cmd), do:

pip install virtualenv

If this does not work, you may need to reboot for the changed PATH settings (by the python installer) to take effect.

  1. Install the most recent GStreamer MSVC packages. You need to download the two .msi files for your platform from the GStreamer website and install them. The currently recommended version is 1.16.0. i.e.:

Note that the MinGW binaries will not work, so make sure that you install the MSVC ones.

Note that you should ensure that all components are installed from gstreamer, as we require many of the optional libraries that are not installed by default.

  1. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default settings for the installer are fine).

  2. Install Visual Studio Build Tools 2019 (https://visualstudio.microsoft.com/de/downloads/#build-tools-for-visual-studio-2019). It is easiest to install via Chocolatey with:

    choco install -y visualstudio2019buildtools --package-parameters="--add Microsoft.VisualStudio.Component.Roslyn.Compiler --add Microsoft.Component.MSBuild --add Microsoft.VisualStudio.Component.CoreBuildTools --add Microsoft.VisualStudio.Workload.MSBuildTools --add Microsoft.VisualStudio.Component.Windows10SDK --add Microsoft.VisualStudio.Component.VC.CoreBuildTools --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 --add Microsoft.VisualStudio.Component.VC.Redist.14.Latest --add Microsoft.VisualStudio.Component.VC.ATL --add Microsoft.VisualStudio.Component.VC.ATLMFC --add Microsoft.VisualStudio.Component.TextTemplating --add Microsoft.VisualStudio.Component.VC.CoreIde --add Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Core --add Microsoft.VisualStudio.Workload.VCTools"
    

    If you really need to use the Visual Studio Installer (UI), choose "Desktop development with C++" and add the optional "MSVC", "C++-ATL" and "C++-MFC" (latest).

The Visual Studio 2019 Build Tools MUST be installed to the default location or mach.bat will not find them.

[Optional] Install LLVM for faster link times

You may experience much faster builds on Windows by following these steps. (Related Rust issue: https://github.com/rust-lang/rust/issues/37543)

  1. Download the latest version of LLVM (https://releases.llvm.org/).
  2. Run the installer and choose to add LLVM to the system PATH.
  3. Add the following to your Cargo config (Found at %USERPROFILE%\.cargo\config). You may need to change the triple to match your environment.
[target.x86_64-pc-windows-msvc]
linker = "lld-link.exe"
Troubleshooting a Windows environment

If you have troubles with x64 type prompt as mach.bat set by default:

  1. You may need to choose and launch the type manually, such as x86_x64 Cross Tools Command Prompt for VS 2019 in the Windows menu.)
  2. cd to/the/path/servo
  3. python mach build -d

If you got the error Cannot run mach in a path on a case-sensitive file system on Windows:

  1. Open Command Prompt or PowerShell as administrator.
  2. Disable case-sensitive for servo path, fsutil.exe file SetCaseSensitiveInfo X:\path\to\servo disable

If you got the error DLL fileapi-ms-win-crt-runtime-l1-1-0.dllnot found! then set the WindowsSdkDir environment variable to an appropriate Windows Kit directory containing Redist\ucrt\DLLs\x64\api-ms-win-crt-runtime-l1-1-0.dll, for example C:\Program Files (x86)\Windows Kits\10.

If you get the error thread 'main' panicked at 'Unable to find libclang: "couldn\'t find any valid shared libraries matching: [\'clang.dll\', \'libclang.dll\'], set theLIBCLANG_PATHenvironment variable to a path where one of these files can be found (invalid: ... invalid DLL (64-bit))])"' then rustup may have installed the 32-bit default target rather than the 64-bit one. You can find the configuration with rustup show, and set the default with rustup set default-host x86_64-pc-windows-msvc.

Cross-compilation for Android

Run ./mach bootstrap-android --build to get Android-specific tools. See wiki for details.

Cloning the Repo

Your CARGO_HOME needs to point to (or be in) the same drive as your Servo repository (See #28530).

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

Building

Servo is built with Cargo, the Rust package manager. We also use Mozilla's Mach tools to orchestrate the build and other tasks. You can call Mach like this:

On Unix systems:

./mach [command] [arguments]

On Windows Commandline:

mach.bat [command] [arguments]

The examples below will use Unix, but the same applies to Windows.

The Rust compiler

Servo's build system uses rustup.rs to automatically download a Rust compiler. This is a specific version of Rust Nightly determined by the rust-toolchain file.

Normal build

To build Servo in development mode. This is useful for development, but the resulting binary is very slow:

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

Release build

For benchmarking, performance testing, or real-world use. Add the --release flag to create an optimized build:

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

Note: mach build will build both servo and libsimpleservo. To make compilation a bit faster, it's possible to only compile the servo binary: ./mach build --dev -p servo.

Checking for build errors, without building

If you’re making changes to one crate that cause build errors in another crate, consider this instead of a full build:

./mach check

It will run cargo check, which runs the analysis phase of the compiler (and so shows build errors if any) but skips the code generation phase. This can be a lot faster than a full build, though of course it doesn’t produce a binary you can run.

Building for Android target

For ARM (armv7-linux-androideabi, most phones):

./mach build --release --android
./mach package --release --android

For x86 (typically for the emulator):

./mach build --release --target i686-linux-android
./mach package --release --target i686-linux-android

Running

Run Servo with the command:

./servo [url] [arguments] # if you run with nightly build
./mach run [url] [arguments] # if you run with mach

# For example
./mach run https://www.google.com

Commandline Arguments

  • -p INTERVAL turns on the profiler and dumps info to the console every INTERVAL seconds
  • -s SIZE sets the tile size for painting; defaults to 512
  • -z disables all graphical output; useful for running JS / layout tests
  • -Z help displays useful output to debug servo

Keyboard Shortcuts

  • Ctrl+L opens URL prompt (Cmd+L on Mac)
  • Ctrl+R reloads current page (Cmd+R on Mac)
  • Ctrl+- zooms out (Cmd+- on Mac)
  • Ctrl+= zooms in (Cmd+= on Mac)
  • Alt+left arrow goes backwards in the history (Cmd+left arrow on Mac)
  • Alt+right arrow goes forwards in the history (Cmd+right arrow on Mac)
  • Esc or Ctrl+Q exits Servo (Cmd+Q on Mac)

Runtime dependencies

Linux

  • GStreamer >=1.16
  • gst-plugins-bad >=1.16

Developing

There are lots of mach commands you can use. You can list them with ./mach --help.

The generated documentation can be found on https://doc.servo.org/servo/index.html