CSS JIT: compile the :empty pseudo class

• Component: New Bugs
• Status: RESOLVED FIXED

[Benjamin Poulain]

CSS JIT: compile the :empty pseudo class

[Benjamin Poulain]

Created attachment 236629 [details]
Patch

[WebKit Commit Bot]

Attachment 236629 [details] did not pass style-queue:


ERROR: Source/WebCore/cssjit/SelectorCompiler.cpp:2527:  This { should be at the end of the previous line  [whitespace/braces] [4]
ERROR: Source/WebCore/cssjit/SelectorCompiler.cpp:2542:  This { should be at the end of the previous line  [whitespace/braces] [4]
Total errors found: 2 in 16 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Andreas Kling]

Comment on attachment 236629 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=236629&action=review

r=me

> Source/WebCore/cssjit/SelectorCompiler.cpp:2465
> +static void jumpIfElementIsNotEmpty(Assembler& assembler, RegisterAllocator &registerAllocator, Assembler::JumpList& notEmptyCases, Assembler::RegisterID element)

RegisterAllocator& (& placement)

> Source/WebCore/cssjit/SelectorCompiler.cpp:2515
> +    if (m_selectorContext == SelectorContext::QuerySelector) {
> +        jumpIfElementIsNotEmpty(m_assembler, m_registerAllocator, failureCases, elementAddressRegister);
> +        return;
> +    }

The querySelector path is so nice and tidy.
Is the affected-by-empty bit optimization really necessary?

[Benjamin Poulain]

(In reply to comment #3)
> > Source/WebCore/cssjit/SelectorCompiler.cpp:2515
> > +    if (m_selectorContext == SelectorContext::QuerySelector) {
> > +        jumpIfElementIsNotEmpty(m_assembler, m_registerAllocator, failureCases, elementAddressRegister);
> > +        return;
> > +    }
> 
> The querySelector path is so nice and tidy.
> Is the affected-by-empty bit optimization really necessary?

Today the flag avoid some style recalc when updating the tree.

I suspect that flag is the cause of the bug, I will look into it in the follow up.

[Benjamin Poulain]

Committed r172619: <http://trac.webkit.org/changeset/172619>