<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>77271</bug_id>
          
          <creation_ts>2012-01-27 22:38:44 -0800</creation_ts>
          <short_desc>Cut the indirections when accessing CSS properties</short_desc>
          <delta_ts>2012-03-09 14:07:28 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>JavaScriptCore</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          <dependson>79014</dependson>
    
    <dependson>80461</dependson>
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Benjamin Poulain">benjamin</reporter>
          <assigned_to name="Benjamin Poulain">benjamin</assigned_to>
          <cc>ap</cc>
    
    <cc>koivisto</cc>
    
    <cc>simon.fraser</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>544613</commentid>
    <comment_count>0</comment_count>
    <who name="Benjamin Poulain">benjamin</who>
    <bug_when>2012-01-27 22:38:44 -0800</bug_when>
    <thetext>Getting a CSS value (e.g. element.style.position) seems to go through many indirections.

From JSCSSStyleDeclaration::getOwnPropertySlot()
-&gt;we check if the name is a valid CSS property
--&gt;we encode the name cssPropertyName()
--&gt;we get the property ID from the name: cssPropertyID()
-&gt;if there is and ID, the name is valid, we set the PropertySlot
--&gt;From JSCSSStyleDeclaration::nameGetter(), we do exactly the same thing:
--&gt;cssPropertyName() to get a valid name
--&gt;cssPropertyID() to get the ID
--&gt;get the property for real

This seems like a lot of indirection. We can at least cut some fat between cssPropertyName() -&gt; cssPropertyID() (some redundancy between those two)
Ideally, JSCSSStyleDeclaration::getOwnPropertySlot() should keep a reference to the CSS Property ID, and getting the actual value would be cheap.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>557478</commentid>
    <comment_count>1</comment_count>
    <who name="Antti Koivisto">koivisto</who>
    <bug_when>2012-02-15 12:55:26 -0800</bug_when>
    <thetext>Does this show up in profiles in some benchmark?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>557552</commentid>
    <comment_count>2</comment_count>
    <who name="Benjamin Poulain">benjamin</who>
    <bug_when>2012-02-15 14:28:22 -0800</bug_when>
    <thetext>(In reply to comment #1)
&gt; Does this show up in profiles in some benchmark?

This shows up in multiple tests of PeaceKeeper.

This is related to:
-https://bugs.webkit.org/show_bug.cgi?id=77158
-https://bugs.webkit.org/show_bug.cgi?id=74782
which gave us some points already.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>572345</commentid>
    <comment_count>3</comment_count>
      <attachid>130494</attachid>
    <who name="Benjamin Poulain">benjamin</who>
    <bug_when>2012-03-06 17:40:32 -0800</bug_when>
    <thetext>Created attachment 130494
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>572347</commentid>
    <comment_count>4</comment_count>
      <attachid>130494</attachid>
    <who name="Benjamin Poulain">benjamin</who>
    <bug_when>2012-03-06 17:40:54 -0800</bug_when>
    <thetext>Comment on attachment 130494
Patch

wrong bug</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>575206</commentid>
    <comment_count>5</comment_count>
    <who name="Benjamin Poulain">benjamin</who>
    <bug_when>2012-03-09 14:07:28 -0800</bug_when>
    <thetext>Closing this meta bug. What is described here is solved.

For the performance of setters, we will need work on the CSS Parser.</thetext>
  </long_desc>
      
          <attachment
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              ispatch="1"
              isprivate="0"
          >
            <attachid>130494</attachid>
            <date>2012-03-06 17:40:32 -0800</date>
            <delta_ts>2012-03-06 17:40:54 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-77271-20120306174031.patch</filename>
            <type>text/plain</type>
            <size>7682</size>
            <attacher name="Benjamin Poulain">benjamin</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>