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The Servo Browser Engine
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Martin Robinson 312cf0df08
script: Create a CrossProcessInstant to enable serializable monotonic time (#33282) 
Up until now, Servo was using a very old version of time to get a
cross-process monotonic timestamp (using `time::precise_time_ns()`).
This change replaces the usage of old time with a new serializable
monotonic time called `CrossProcessInstant` and uses it where `u64`
timestamps were stored before. The standard library doesn't provide this
functionality because it isn't something you can do reliably on all
platforms. The idea is that we do our best and then fall back
gracefully.

This is a big change, because Servo was using `u64` timestamps all over
the place some as raw values taken from `time::precise_time_ns()` and
some as relative offsets from the "navigation start," which is a concept
similar to DOM's `timeOrigin` (but not exactly the same). It's very
difficult to fix this situation without fixing it everywhere as the
`Instant` concept is supposed to be opaque. The good thing is that this
change clears up all ambiguity when passing times as a `time::Duration`
is unit agnostic and a `CrossProcessInstant` represents an absolute
moment in time.

The `time` version of `Duration` is used because it can both be negative
and is also serializable.

Good things:
 - No need too pass around `time` and `time_precise` any longer.
   `CrossProcessInstant` is also precise and monotonic.
 - The distinction between a time that is unset or at `0` (at some kind
   of timer epoch) is now gone.

There still a lot of work to do to clean up timing, but this is the
first step. In general, I've tried to preserve existing behavior, even
when not spec compliant, as much as possible. I plan to submit followup
PRs fixing some of the issues I've noticed.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
2024-09-05 18:50:09 +00:00
.cargo Make crown optional (#32494) 2024-06-24 11:46:43 +00:00
.github CI: use monitor API for self-hosted runners (#33315) 2024-09-04 17:11:32 +00:00
.vscode Format toml files (#30112) 2023-08-17 15:07:43 +00:00
components script: Create a CrossProcessInstant to enable serializable monotonic time (#33282) 2024-09-05 18:50:09 +00:00
docs Update in-tree docs to point to the new book (#32743) 2024-07-09 15:42:00 +00:00
etc Update Rust to 1.80.1 (#33008) 2024-08-12 11:40:46 +00:00
ports/servoshell build(deps): bump ohos-sys from 0.3.0 to 0.3.1 (#33329) 2024-09-05 17:28:57 +00:00
python bootstrap: Avoid needless sudo when pkgs are installed (#33281) 2024-09-02 06:56:38 +00:00
resources servoshell: Enable OpenXR by default and remove old WebVR prefs, adjust XrDiscovery initialization (#33245) 2024-08-29 05:06:57 +00:00
support Update layout of servoshell android app (#33294) 2024-09-04 11:30:52 +00:00
tests script: Create a CrossProcessInstant to enable serializable monotonic time (#33282) 2024-09-05 18:50:09 +00:00
third_party Update WebIDL.py (#32495) 2024-06-15 04:22:42 +00:00
.clang-format Run test-tidy on Windows 2019-11-21 09:56:39 +01:00
.flake8 Improve formatting of Python files (#30919) 2023-12-24 23:58:37 +00:00
.gitattributes mark test/wpt as vendored in .gitattributes (#32663) 2024-07-02 11:23:18 +00:00
.gitignore Add initial support for tracing and tracing-perfetto (#33188) 2024-09-04 08:24:29 +00:00
.mailmap Update Tetsuharu OHZEKI's entry in mailmap 2019-11-15 00:46:45 +09:00
Cargo.lock script: Create a CrossProcessInstant to enable serializable monotonic time (#33282) 2024-09-05 18:50:09 +00:00
Cargo.toml script: Create a CrossProcessInstant to enable serializable monotonic time (#33282) 2024-09-05 18:50:09 +00:00
CLOBBER Add clobber mechanism 2017-05-08 16:19:56 +02:00
CODE_OF_CONDUCT.md Clarify the Code of Conduct (closes servo/servo.org#164) (#32835) 2024-07-23 09:12:03 +00:00
CONTRIBUTING.md Update in-tree docs to point to the new book (#32743) 2024-07-09 15:42:00 +00:00
deny.toml Add cargo-deny to mach-tidy to check license compliance. (#32465) 2024-06-12 09:54:45 +00:00
Info.plist remove bhtml 2018-02-11 08:02:39 +01:00
LICENSE Update MPL license to https (part 1) 2018-11-19 14:46:43 +01:00
mach Make Android build optional on Nix (#31231) 2024-02-02 02:13:24 +00:00
mach.bat Make mach.bat request Python 3 2021-05-22 18:27:10 +09:00
PULL_REQUEST_TEMPLATE.md Minor pull request template cleanup 2018-12-08 13:11:37 -08:00
README.md Update mozjs (SpiderMonkey) to 128.0 (#32769) 2024-07-29 07:20:15 +00:00
rust-toolchain.toml CI: Add separate Lint&Tidy check and remove test-tidy from linux (#33150) 2024-08-23 08:58:12 +00:00
rustfmt.toml mach: Do not use unstable rust for rustfmt (#31441) 2024-02-28 13:53:04 +00:00
SECURITY.md Update new issue URL in SECURITY.md (#31698) 2024-03-15 15:03:49 +00:00
servo-tidy.toml Make tracing available on all platforms, with or without perfetto (#33301) 2024-09-04 12:56:29 +00:00
servobuild.example Add OpenHarmony support to mach and CI (#32507) 2024-06-17 11:27:23 +00:00
shell.nix Nix: allow nix-shell without explicit path to shell.nix (#32035) 2024-04-17 07:02:31 +00:00
taplo.toml Format toml files (#30112) 2023-08-17 15:07:43 +00:00

README.md

The Servo Parallel Browser Engine Project

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. Check out The Servo Book to get started, or go to servo.org for news and guides.

Getting started

For more detailed build instructions, see the Servo book under Setting up your environment, Building Servo, and Building for Android.

macOS

  • Download and install python, Xcode, and brew
  • Install rustup: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
  • Restart your shell to make sure cargo is available
  • Install the other dependencies: ./mach bootstrap
  • Build servoshell: ./mach build

Linux

  • Install curl and python:
    • Arch: sudo pacman -S --needed curl python python-pip
    • Debian, Ubuntu: sudo apt install curl python3-pip python3-venv
    • Fedora: sudo dnf install curl python3 python3-pip python3-devel
    • Gentoo: sudo emerge net-misc/curl dev-python/pip
  • Install rustup: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
  • Restart your shell to make sure cargo is available
  • Install the other dependencies: ./mach bootstrap
  • Build servoshell: ./mach build

Windows

  • Download and install python, choco, and rustup
    • Be sure to select Quick install via the Visual Studio Community installer
  • In the Visual Studio Installer, ensure the following components are installed:
    • Windows 10 SDK (10.0.19041.0) (Microsoft.VisualStudio.Component.Windows10SDK.19041)
    • MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest) (Microsoft.VisualStudio.Component.VC.Tools.x86.x64)
    • C++ ATL for latest v143 build tools (x86 & x64) (Microsoft.VisualStudio.Component.VC.ATL)
    • C++ MFC for latest v143 build tools (x86 & x64) (Microsoft.VisualStudio.Component.VC.ATLMFC)
  • Restart your shell to make sure cargo is available
  • Install the other dependencies: .\mach bootstrap
  • Build servoshell: .\mach build

Android

  • Ensure that the following environment variables are set:
    • ANDROID_SDK_ROOT
    • ANDROID_NDK_ROOT: $ANDROID_SDK_ROOT/ndk/26.2.11394342/ ANDROID_SDK_ROOT can be any directory (such as ~/android-sdk). All of the Android build dependencies will be installed there.
  • Install the latest version of the Android command-line tools to $ANDROID_SDK_ROOT/cmdline-tools/latest.
  • Run the following command to install the necessary components: 
    sudo $ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager --install
 "build-tools;33.0.2" \
 "emulator" \
 "ndk;26.2.11394342" \
 "platform-tools" \
 "platforms;android-33" \
 "system-images;android-33;google_apis;x86_64"
  • Follow the instructions above for the platform you are building on