Use preallocated stack reference to store adjacentBacktrackingStart

• Component: CSS
• Status: RESOLVED FIXED

[Yusuke Suzuki]

Instead of using push / pop, allocate stack reference in prologue and store adjacentBacktrackingStart to it.

[Yusuke Suzuki]

Created attachment 228614 [details]
Patch

[Benjamin Poulain]

Comment on attachment 228614 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=228614&action=review

Everything looks correct to me.  CQ- because of two nitpicks.

> Source/WebCore/cssjit/SelectorCompiler.cpp:210
> +    bool m_needsAdjacentBacktrackingStart : 1;

You should not use a bit field here.

I would put the field just after m_selectorFragments since it is related to a global state of code generation.

> Source/WebCore/cssjit/StackAllocator.h:63
> +    StackReference push()

The name push() is a bit misleading. I think allocate() or allocateUninitialized() would be better.

[Yusuke Suzuki]

Created attachment 228665 [details]
Patch

[Yusuke Suzuki]

Comment on attachment 228614 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=228614&action=review

Thank you for your review!
I've fixed and attached revised patch.

>> Source/WebCore/cssjit/SelectorCompiler.cpp:210
>> +    bool m_needsAdjacentBacktrackingStart : 1;
> 
> You should not use a bit field here.
> 
> I would put the field just after m_selectorFragments since it is related to a global state of code generation.

Thank you! You're right.
I've removed a bit field. And moved m_needsAdjacentBacktrackingStart to just after m_selectorFragments.

>> Source/WebCore/cssjit/StackAllocator.h:63
>> +    StackReference push()
> 
> The name push() is a bit misleading. I think allocate() or allocateUninitialized() would be better.

Right. I've renamed it to allocateUninitialized.

[Benjamin Poulain]

Comment on attachment 228665 [details]
Patch

Everything looks good to me.

[WebKit Commit Bot]

Comment on attachment 228665 [details]
Patch

Clearing flags on attachment: 228665

Committed r166834: <http://trac.webkit.org/changeset/166834>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Yusuke Suzuki]

Thank you!