|email@example.com <firstname.lastname@example.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc>||Sat May 23 04:03:20 2020 +0000|
|email@example.com <firstname.lastname@example.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc>||Sat May 23 04:03:20 2020 +0000|
Nullptr deref in WebCore::RenderTreeBuilder::Block::attachIgnoringContinuation when parent and beforeChild are siblings https://bugs.webkit.org/show_bug.cgi?id=212116 <rdar://problem/62993844> Reviewed by Simon Fraser. Source/WebCore: This patch fixes the case when a nested fragmented context has a spanner and we try to form a continuation while this nested fragmented context is being destroyed. 1. The continuation is triggered by a style change that turns a previously out-of-flow block container into an inflow box (and the parent inline level container can't have the box as a direct child anymore). 2. An unrelated style change nukes the nested fragmented context. We need to "re-assign" the spanner to the parent fragment. These 2 changes are split into 2 phases; first we take care of the tree mutation triggered by the continuation (updateRendererStyle), while we do the fragmented context cleanup (updateAfterDescendants) in a separate step. This 2 phase setup confuses the "where to put this spanner" logic. This patch addresses the issue by keeping the spanner inside the about-to-be-destroyed fragmented context while forming the continuation (phase #1) and let the second phase (updateAfterDescendants) deal with the spanner moving. Test: fast/multicol/nested-multicol-with-spanner-and-continuation.html * rendering/updating/RenderTreeBuilderMultiColumn.cpp: (WebCore::isValidColumnSpanner): LayoutTests: * fast/multicol/nested-multicol-with-spanner-and-continuation-expected.txt: Added. * fast/multicol/nested-multicol-with-spanner-and-continuation.html: Added. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@262093 268f45cc-cd09-0410-ab3c-d52691b4dbfc
WebKit is a cross-platform web browser engine. On iOS and macOS, it powers Safari, Mail, iBooks, and many other applications.
Visit WebKit Feature Status page to see which Web API has been implemented, in development, or under consideration.
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On Windows, follow the instructions on our website.
Run the following command to clone WebKit's Git SVN repository:
git clone git://git.webkit.org/WebKit.git WebKit
git clone https://git.webkit.org/git/WebKit.git WebKit
If you want to be able to commit changes to the repository, or just want to check out branches that aren’t contained in WebKit.git, you will need track WebKit's Subversion repository. You can run the following command to configure this and other options of the new Git clone for WebKit development.
For information about this, and other aspects of using Git with WebKit, read the wiki page.
If you don‘t want to use Git, run the following command to check out WebKit’s Subversion repository:
svn checkout https://svn.webkit.org/repository/webkit/trunk WebKit
Install Xcode and its command line tools if you haven't done so already:
Run the following command to build a debug build with debugging symbols and assertions:
For performance testing, and other purposes, use
You can open
WebKit.xcworkspace to build and debug WebKit within Xcode.
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.
The first time after you install a new Xcode, you will need to run the following command to enable Xcode to build command line tools for iOS Simulator:
Without this step, you will see the error message: “
target specifies product type ‘com.apple.product-type.tool’, but there’s no such product type for the ‘iphonesimulator’ platform.” when building target
JSCLLIntOffsetsExtractor of project
Run the following command to build a debug build with debugging symbols and assertions for iOS:
Tools/Scripts/build-webkit --debug --ios-simulator
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 wiki page.
Run the following command to launch Safari with your local build of WebKit:
run-safari script sets the
DYLD_FRAMEWORK_PATH environment variable to point to your build products, and then launches
DYLD_FRAMEWORK_PATH tells the system loader to prefer your build products over the frameworks installed in
To run other applications with your local build of WebKit, run the following command:
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
If you have a development build, you can use the run-minibrowser script, e.g.:
run-minibrowser --debug --wpe
Pass one of
--wpe to indicate the port to use.
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