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<title>[184120] trunk/Source/JavaScriptCore</title>
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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/184120">184120</a></dd>
<dt>Author</dt> <dd>akling@apple.com</dd>
<dt>Date</dt> <dd>2015-05-11 14:13:53 -0700 (Mon, 11 May 2015)</dd>
</dl>

<h3>Log Message</h3>
<pre>PropertyNameArray should use a Vector when there are few entries.
&lt;https://webkit.org/b/144874&gt;

Reviewed by Geoffrey Garen.

Bring back an optimization that was lost in the for-in refactoring.
PropertyNameArray now holds a Vector&lt;AtomicStringImpl*&gt; until there are
enough (20) entries to justify converting to a HashSet for contains().

Also inlined the code while we're here, since it has so few clients and
the call overhead adds up.

~5% progression on Kraken/json-stringify-tinderbox.

* runtime/PropertyNameArray.cpp: Removed.
* runtime/PropertyNameArray.h:
(JSC::PropertyNameArray::canAddKnownUniqueForStructure):
(JSC::PropertyNameArray::add):
(JSC::PropertyNameArray::addKnownUnique):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreCMakeListstxt">trunk/Source/JavaScriptCore/CMakeLists.txt</a></li>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreJavaScriptCorevcxprojJavaScriptCorevcxproj">trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj</a></li>
<li><a href="#trunkSourceJavaScriptCoreJavaScriptCorevcxprojJavaScriptCorevcxprojfilters">trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters</a></li>
<li><a href="#trunkSourceJavaScriptCoreJavaScriptCorexcodeprojprojectpbxproj">trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimePropertyNameArrayh">trunk/Source/JavaScriptCore/runtime/PropertyNameArray.h</a></li>
</ul>

<h3>Removed Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreruntimePropertyNameArraycpp">trunk/Source/JavaScriptCore/runtime/PropertyNameArray.cpp</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreCMakeListstxt"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/CMakeLists.txt (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/CMakeLists.txt        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/CMakeLists.txt        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -539,7 +539,6 @@
</span><span class="cx">     runtime/Operations.cpp
</span><span class="cx">     runtime/Options.cpp
</span><span class="cx">     runtime/PropertyDescriptor.cpp
</span><del>-    runtime/PropertyNameArray.cpp
</del><span class="cx">     runtime/PropertySlot.cpp
</span><span class="cx">     runtime/PropertyTable.cpp
</span><span class="cx">     runtime/PrototypeMap.cpp
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/ChangeLog        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -1,3 +1,25 @@
</span><ins>+2015-05-11  Andreas Kling  &lt;akling@apple.com&gt;
+
+        PropertyNameArray should use a Vector when there are few entries.
+        &lt;https://webkit.org/b/144874&gt;
+
+        Reviewed by Geoffrey Garen.
+
+        Bring back an optimization that was lost in the for-in refactoring.
+        PropertyNameArray now holds a Vector&lt;AtomicStringImpl*&gt; until there are
+        enough (20) entries to justify converting to a HashSet for contains().
+
+        Also inlined the code while we're here, since it has so few clients and
+        the call overhead adds up.
+
+        ~5% progression on Kraken/json-stringify-tinderbox.
+
+        * runtime/PropertyNameArray.cpp: Removed.
+        * runtime/PropertyNameArray.h:
+        (JSC::PropertyNameArray::canAddKnownUniqueForStructure):
+        (JSC::PropertyNameArray::add):
+        (JSC::PropertyNameArray::addKnownUnique):
+
</ins><span class="cx"> 2015-05-11  Matt Baker  &lt;mattbaker@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Web Inspector: REGRESSION (r175203): No profile information is shown in Inspector
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreJavaScriptCorevcxprojJavaScriptCorevcxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -799,7 +799,6 @@
</span><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\Operations.cpp&quot; /&gt;
</span><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\Options.cpp&quot; /&gt;
</span><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\PropertyDescriptor.cpp&quot; /&gt;
</span><del>-    &lt;ClCompile Include=&quot;..\runtime\PropertyNameArray.cpp&quot; /&gt;
</del><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\PropertySlot.cpp&quot; /&gt;
</span><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\PropertyTable.cpp&quot; /&gt;
</span><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\PrototypeMap.cpp&quot; /&gt;
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreJavaScriptCorevcxprojJavaScriptCorevcxprojfilters"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -780,9 +780,6 @@
</span><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\PropertyDescriptor.cpp&quot;&gt;
</span><span class="cx">       &lt;Filter&gt;runtime&lt;/Filter&gt;
</span><span class="cx">     &lt;/ClCompile&gt;
</span><del>-    &lt;ClCompile Include=&quot;..\runtime\PropertyNameArray.cpp&quot;&gt;
-      &lt;Filter&gt;runtime&lt;/Filter&gt;
-    &lt;/ClCompile&gt;
</del><span class="cx">     &lt;ClCompile Include=&quot;..\runtime\PropertySlot.cpp&quot;&gt;
</span><span class="cx">       &lt;Filter&gt;runtime&lt;/Filter&gt;
</span><span class="cx">     &lt;/ClCompile&gt;
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreJavaScriptCorexcodeprojprojectpbxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -819,7 +819,6 @@
</span><span class="cx">                 14469DE4107EC7E700650446 /* NumberPrototype.cpp in Sources */ = {isa = PBXBuildFile; fileRef = BC2680C40E16D4E900A06E92 /* NumberPrototype.cpp */; };
</span><span class="cx">                 14469DE5107EC7E700650446 /* ObjectConstructor.cpp in Sources */ = {isa = PBXBuildFile; fileRef = BC2680C60E16D4E900A06E92 /* ObjectConstructor.cpp */; };
</span><span class="cx">                 14469DE6107EC7E700650446 /* ObjectPrototype.cpp in Sources */ = {isa = PBXBuildFile; fileRef = BC2680C80E16D4E900A06E92 /* ObjectPrototype.cpp */; };
</span><del>-                14469DE7107EC7E700650446 /* PropertyNameArray.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 65400C0F0A69BAF200509887 /* PropertyNameArray.cpp */; };
</del><span class="cx">                 14469DE8107EC7E700650446 /* PropertySlot.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 65621E6B089E859700760F35 /* PropertySlot.cpp */; };
</span><span class="cx">                 14469DEB107EC7E700650446 /* StringConstructor.cpp in Sources */ = {isa = PBXBuildFile; fileRef = BC18C3C00E16EE3300B34460 /* StringConstructor.cpp */; };
</span><span class="cx">                 14469DEC107EC7E700650446 /* StringObject.cpp in Sources */ = {isa = PBXBuildFile; fileRef = BC18C3C20E16EE3300B34460 /* StringObject.cpp */; };
</span><span class="lines">@@ -2678,7 +2677,6 @@
</span><span class="cx">                 652A3A221651C69700A80AFE /* A64DOpcode.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = A64DOpcode.cpp; path = disassembler/ARM64/A64DOpcode.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 652A3A231651C69700A80AFE /* A64DOpcode.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = A64DOpcode.h; path = disassembler/ARM64/A64DOpcode.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 65303D631447B9E100D3F904 /* ParserTokens.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ParserTokens.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><del>-                65400C0F0A69BAF200509887 /* PropertyNameArray.cpp */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.cpp.cpp; path = PropertyNameArray.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
</del><span class="cx">                 65400C100A69BAF200509887 /* PropertyNameArray.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = PropertyNameArray.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 6546F51F1A32A59C006F07D5 /* NullGetterFunction.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; lineEnding = 0; path = NullGetterFunction.cpp; sourceTree = &quot;&lt;group&gt;&quot;; xcLanguageSpecificationIdentifier = xcode.lang.cpp; };
</span><span class="cx">                 6546F5201A32A59C006F07D5 /* NullGetterFunction.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NullGetterFunction.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="lines">@@ -4637,7 +4635,6 @@
</span><span class="cx">                                 A7FB604B103F5EAB0017A286 /* PropertyDescriptor.h */,
</span><span class="cx">                                 BC95437C0EBA70FD0072B6D3 /* PropertyMapHashTable.h */,
</span><span class="cx">                                 86158AB2155C8B3F00B45C9C /* PropertyName.h */,
</span><del>-                                65400C0F0A69BAF200509887 /* PropertyNameArray.cpp */,
</del><span class="cx">                                 65400C100A69BAF200509887 /* PropertyNameArray.h */,
</span><span class="cx">                                 0FF7168A15A3B231008F5DAA /* PropertyOffset.h */,
</span><span class="cx">                                 65621E6B089E859700760F35 /* PropertySlot.cpp */,
</span><span class="lines">@@ -7486,7 +7483,6 @@
</span><span class="cx">                                 0FB1058D1675483700F8AB6E /* ProfilerOSRExitSite.cpp in Sources */,
</span><span class="cx">                                 0F13912B16771C3A009CCB07 /* ProfilerProfiledBytecodes.cpp in Sources */,
</span><span class="cx">                                 A7FB60A4103F7DC20017A286 /* PropertyDescriptor.cpp in Sources */,
</span><del>-                                14469DE7107EC7E700650446 /* PropertyNameArray.cpp in Sources */,
</del><span class="cx">                                 14469DE8107EC7E700650446 /* PropertySlot.cpp in Sources */,
</span><span class="cx">                                 ADE39FFF16DD144B0003CD4A /* PropertyTable.cpp in Sources */,
</span><span class="cx">                                 65FB5117184EEE7000C12B70 /* ProtoCallFrame.cpp in Sources */,
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimePropertyNameArraycpp"></a>
<div class="delfile"><h4>Deleted: trunk/Source/JavaScriptCore/runtime/PropertyNameArray.cpp (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/PropertyNameArray.cpp        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/runtime/PropertyNameArray.cpp        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -1,42 +0,0 @@
</span><del>-/*
- *  Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Library General Public
- *  License as published by the Free Software Foundation; either
- *  version 2 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Library General Public License for more details.
- *
- *  You should have received a copy of the GNU Library General Public License
- *  along with this library; see the file COPYING.LIB.  If not, write to
- *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- *  Boston, MA 02110-1301, USA.
- *
- */
-
-#include &quot;config.h&quot;
-#include &quot;PropertyNameArray.h&quot;
-
-#include &quot;JSCInlines.h&quot;
-#include &quot;JSObject.h&quot;
-#include &quot;JSPropertyNameEnumerator.h&quot;
-#include &quot;Structure.h&quot;
-#include &quot;StructureChain.h&quot;
-
-namespace JSC {
-
-void PropertyNameArray::add(AtomicStringImpl* identifier)
-{
-    ASSERT(identifier);
-
-    if (!m_set.add(identifier).isNewEntry)
-        return;
-
-    addKnownUnique(identifier);
-}
-
-} // namespace JSC
</del></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimePropertyNameArrayh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/PropertyNameArray.h (184119 => 184120)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/PropertyNameArray.h        2015-05-11 20:42:39 UTC (rev 184119)
+++ trunk/Source/JavaScriptCore/runtime/PropertyNameArray.h        2015-05-11 21:13:53 UTC (rev 184120)
</span><span class="lines">@@ -70,13 +70,9 @@
</span><span class="cx">         add(Identifier::from(m_vm, index));
</span><span class="cx">     }
</span><span class="cx"> 
</span><del>-    void add(const Identifier&amp; identifier) { add(identifier.impl()); }
-    JS_EXPORT_PRIVATE void add(AtomicStringImpl*);
-    void addKnownUnique(AtomicStringImpl* identifier)
-    {
-        m_set.add(identifier);
-        m_data-&gt;propertyNameVector().append(Identifier::fromUid(m_vm, identifier));
-    }
</del><ins>+    void add(const Identifier&amp;);
+    void add(AtomicStringImpl*);
+    void addKnownUnique(AtomicStringImpl*);
</ins><span class="cx"> 
</span><span class="cx">     Identifier&amp; operator[](unsigned i) { return m_data-&gt;propertyNameVector()[i]; }
</span><span class="cx">     const Identifier&amp; operator[](unsigned i) const { return m_data-&gt;propertyNameVector()[i]; }
</span><span class="lines">@@ -86,7 +82,7 @@
</span><span class="cx">     PassRefPtr&lt;PropertyNameArrayData&gt; releaseData() { return m_data.release(); }
</span><span class="cx"> 
</span><span class="cx">     // FIXME: Remove these functions.
</span><del>-    bool canAddKnownUniqueForStructure() const { return m_set.isEmpty(); }
</del><ins>+    bool canAddKnownUniqueForStructure() const { return m_data-&gt;propertyNameVector().isEmpty(); }
</ins><span class="cx">     typedef PropertyNameArrayData::PropertyNameVector::const_iterator const_iterator;
</span><span class="cx">     size_t size() const { return m_data-&gt;propertyNameVector().size(); }
</span><span class="cx">     const_iterator begin() const { return m_data-&gt;propertyNameVector().begin(); }
</span><span class="lines">@@ -98,6 +94,37 @@
</span><span class="cx">     VM* m_vm;
</span><span class="cx"> };
</span><span class="cx"> 
</span><ins>+ALWAYS_INLINE void PropertyNameArray::add(const Identifier&amp; identifier)
+{
+    add(identifier.impl());
+}
+
+ALWAYS_INLINE void PropertyNameArray::addKnownUnique(AtomicStringImpl* identifier)
+{
+    m_data-&gt;propertyNameVector().append(Identifier::fromUid(m_vm, identifier));
+}
+
+ALWAYS_INLINE void PropertyNameArray::add(AtomicStringImpl* identifier)
+{
+    static const unsigned setThreshold = 20;
+
+    ASSERT(identifier);
+
+    if (size() &lt; setThreshold) {
+        if (m_data-&gt;propertyNameVector().contains(identifier))
+            return;
+    } else {
+        if (m_set.isEmpty()) {
+            for (Identifier&amp; name : m_data-&gt;propertyNameVector())
+                m_set.add(name.impl());
+        }
+        if (!m_set.add(identifier).isNewEntry)
+            return;
+    }
+
+    addKnownUnique(identifier);
+}
+
</ins><span class="cx"> } // namespace JSC
</span><span class="cx"> 
</span><span class="cx"> #endif // PropertyNameArray_h
</span></span></pre>
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