This is a build of WebKit with some extra patches used by bun
The changes to WebKit are as follows:
bmalloc::api::availableMemory() accounts for cgroups 1 & 2 memory limitsJSC::ErrorInstance has a captureStackTrace function which lets you update the internally-stored Vector<StackTrace>JSC::JSGlobalObject has a double overridenDateNow field which lets you override the timestamp used for Date.now() and new Date()JSC::VM has a onComputeErrorInfo callback which lets the embedder customize how Error.prototype.stack strings are formatted (Bun uses this to make them match V8's behavior, for Node.js compatibility)OptionsList::showPrivateScriptsInStackTraces() enables ImplementationVisibilty::Private functions showing up in stack tracesJSString iterator that exposes the pointer of each nested JSRopeString's underlying buffer to a callback without flattening/allocating an entirely new string. This is useful for native code piping strings from JavaScript to elsewhere, or manually allocating strings outside of WTF::String. console.log or server-side rendering (when not using streams) are examples.ExternalStringImpl now supports static strings. This is somewhat of a hack; the better solution for this case is a script that generates all the static strings at compile time using NeverDestroyed<StaticStringImpl>, however need to figure out a way to do that well from Zig.OptionsList::useV8DateParser enables v8's date parser.ReferenceError message was changed to match V8 (ReferenceError: Can't find variable: <variable> -> ReferenceError: <variable> is undefined).Still need to figure out how to get the remote inspector to work.
NOTE: If you make a change to this repo make sure to update the commit hash in cmake/tools/SetupWebKit.cmake in Bun.
WebKit is a cross-platform web browser engine. On iOS and macOS, it powers Safari, Mail, Apple Books, and many other applications. For more information about WebKit, see the WebKit project website.
On macOS, download Safari Technology Preview to test the latest version of WebKit. On Linux, download Epiphany Technology Preview. On Windows, you'll have to build it yourself.
Once your bug is filed, you will receive email when it is updated at each stage in the bug life cycle. After the bug is considered fixed, you may be asked to download the latest nightly and confirm that the fix works for you.
Run the following command to clone WebKit's Git repository:
git clone https://github.com/WebKit/WebKit.git WebKit
You can enable git fsmonitor to make many git commands faster (such as git status) with git config core.fsmonitor true
Install Xcode and its command line tools if you haven't done so already:
xcode-select --installRun the following command to build a macOS debug build with debugging symbols and assertions:
Tools/Scripts/build-webkit --debug
For performance testing, and other purposes, use --release instead. If you also need debug symbols (dSYMs), run:
Tools/Scripts/build-webkit --release DEBUG_INFORMATION_FORMAT=dwarf-with-dsym
To build for an embedded platform like iOS, tvOS, or watchOS, pass a platform argument to build-webkit.
For example, to build a debug build with debugging symbols and assertions for embedded simulators:
Tools/Scripts/build-webkit --debug --<platform>-simulator
or embedded devices:
Tools/Scripts/build-webkit --debug --<platform>-device
where platform is ios, tvos or watchos.
You can open WebKit.xcworkspace to build and debug WebKit within Xcode. Select the "Everything up to WebKit + Tools" scheme to build the entire project.
If you don't use a custom build location in Xcode preferences, you have to update the workspace settings to use WebKitBuild directory. In menu bar, choose File > Workspace Settings, then click the Advanced button, select "Custom", "Relative to Workspace", and enter WebKitBuild for both Products and Intermediates.
For production builds:
cmake -DPORT=GTK -DCMAKE_BUILD_TYPE=RelWithDebInfo -GNinja
ninja
sudo ninja install
For development builds:
Tools/gtk/install-dependencies
Tools/Scripts/update-webkitgtk-libs
Tools/Scripts/build-webkit --gtk --debug
For more information on building WebKitGTK, see the wiki page.
For production builds:
cmake -DPORT=WPE -DCMAKE_BUILD_TYPE=RelWithDebInfo -GNinja
ninja
sudo ninja install
For development builds:
Tools/wpe/install-dependencies
Tools/Scripts/update-webkitwpe-libs
Tools/Scripts/build-webkit --wpe --debug
For building WebKit on Windows, see the WebKit on Windows page.
With Safari and Other macOS ApplicationsRun the following command to launch Safari with your local build of WebKit:
Tools/Scripts/run-safari --debug
The run-safari script sets the DYLD_FRAMEWORK_PATH environment variable to point to your build products, and then launches /Applications/Safari.app. DYLD_FRAMEWORK_PATH tells the system loader to prefer your build products over the frameworks installed in /System/Library/Frameworks.
To run other applications with your local build of WebKit, run the following command:
Tools/Scripts/run-webkit-app <application-path>
Run the following command to launch iOS simulator with your local build of WebKit:
run-safari --debug --ios-simulator
In both cases, if you have built release builds instead, use --release instead of --debug.
To run other applications, for example MobileMiniBrowser, with your local build of WebKit, run the following command:
Tools/Scripts/run-webkit-app --debug --iphone-simulator <application-path>
Open WebKit.xcworkspace, select intended scheme such as MobileMiniBrowser and an iOS simulator as target, click run.
If you have a development build, you can use the run-minibrowser script, e.g.:
run-minibrowser --debug --wpe
Pass one of --gtk, --jsc-only, or --wpe to indicate the port to use.
Congratulations! You’re up and running. Now you can begin coding in WebKit and contribute your fixes and new features to the project. For details on submitting your code to the project, read Contributing Code.
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