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webkit / WebKit / eb351cad9c346192ed795cab480c248ba81ce409
commiteb351cad9c346192ed795cab480c248ba81ce409[log] [tgz]
authorutatane.tea@gmail.com <utatane.tea@gmail.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc>Fri May 25 04:29:13 2018 +0000
committerutatane.tea@gmail.com <utatane.tea@gmail.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc>Fri May 25 04:29:13 2018 +0000
tree917807a295eb2b5710d05592d42245d16cedcd9a
parentec0d2684b668ebcf7235803c033cbb31761fb6f7 [diff]
[Baseline] Remove a hack for DCE removal of NewFunction
https://bugs.webkit.org/show_bug.cgi?id=185945

Reviewed by Saam Barati.

This `undefined` check in baseline is originally introduced in r177871. The problem was,
when NewFunction is removed in DFG DCE, its referencing scope DFG node  is also removed.
While op_new_func_xxx want to have scope for function creation, DFG OSR exit cannot
retrieve this into the stack since the scope is not referenced from anywhere.

In r177871, we fixed this by accepting `undefined` scope in the baseline op_new_func_xxx
implementation. But rather than that, just emitting `Phantom` for this scope is clean
and consistent to the other DFG nodes like GetClosureVar.

This patch emits Phantom instead, and removes unnecessary `undefined` check in baseline.
While we emit Phantom, it is not testable since NewFunction is guarded by MovHint which
is not removed in DFG. And in FTL, NewFunction will be converted to PhantomNewFunction
if it is not referenced. And scope node is kept by PutHint. But emitting Phantom is nice
since it conservatively guards the scope, and it does not introduce any additional overhead
compared to the current status.

* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* jit/JITOpcodes.cpp:
(JSC::JIT::emitNewFuncExprCommon):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@232182 268f45cc-cd09-0410-ab3c-d52691b4dbfc
3 files changed
tree: 917807a295eb2b5710d05592d42245d16cedcd9a
  1. Examples/
  2. JSTests/
  3. LayoutTests/
  4. ManualTests/
  5. PerformanceTests/
  6. Source/
  7. Tools/
  8. WebDriverTests/
  9. WebKit.xcworkspace/
  10. WebKitLibraries/
  11. Websites/
  12. .clang-format
  13. .dir-locals.el
  14. .gitattributes
  15. .gitignore
  16. ChangeLog
  17. ChangeLog-2012-05-22
  18. ChangeLog-2018-01-01
  19. CMakeLists.txt
  20. Makefile
  21. Makefile.shared
  22. ReadMe.md
ReadMe.md

WebKit

WebKit is a cross-platform web browser engine. On iOS and macOS, it powers Safari, Mail, iBooks, and many other applications.

Feature Status

Visit WebKit Feature Status page to see which Web API has been implemented, in development, or under consideration.

Trying the Latest

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.

Reporting Bugs

  1. Search WebKit Bugzilla to see if there is an existing report for the bug you've encountered.
  2. Create a Bugzilla account to to report bugs (and to comment on them) if you haven't done so already.
  3. File a bug in accordance with our guidelines.

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.

Getting the Code

On Windows, follow the instructions on our website.

Cloning the Git SVN Repository

Run the following command to clone WebKit's Git SVN repository:

git clone git://git.webkit.org/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.

Tools/Scripts/webkit-patch setup-git-clone

For information about this, and other aspects of using Git with WebKit, read the wiki page.

Checking out the Subversion Repository

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

Building WebKit

Building macOS Port

Install Xcode and its command line tools if you haven't done so already:

  1. Install Xcode Get Xcode from https://developer.apple.com/downloads. To build WebKit for OS X, Xcode 5.1.1 or later is required. To build WebKit for iOS Simulator, Xcode 7 or later is required.
  2. Install the Xcode Command Line Tools In Terminal, run the command: xcode-select --install

Run the following command to build a debug build with debugging symbols and assertions:

Tools/Scripts/build-webkit --debug

For performance testing, and other purposes, use --release instead.

Using Xcode

You can open WebKit.xcworkspace to build and debug WebKit within WebKit.

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.

Building iOS Port

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:

sudo Tools/Scripts/configure-xcode-for-ios-development

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 JavaScriptCore.

Run the following command to build a debug build with debugging symbols and assertions for iOS:

Tools/Scripts/build-webkit --debug --ios-simulator.

Building the GTK+ Port

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.

Building the WPE Port

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

Building Windows Port

For building WebKit on Windows, see the wiki page.

Running WebKit

With Safari and Other macOS Applications

Run 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>

iOS Simulator

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.

Linux Ports

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.

Contribute

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.