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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/165090">165090</a></dd>
<dt>Author</dt> <dd>akling@apple.com</dd>
<dt>Date</dt> <dd>2014-03-04 18:35:18 -0800 (Tue, 04 Mar 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Streamline JSValue::get().
<https://webkit.org/b/129720>
Fetch each Structure and VM only once when walking the prototype chain
in JSObject::getPropertySlot(), then pass it along to the functions
we call from there, so they don't have to re-fetch it.
Reviewed by Geoff Garen.
* runtime/JSObject.h:
(JSC::JSObject::inlineGetOwnPropertySlot):
(JSC::JSObject::fastGetOwnPropertySlot):
(JSC::JSObject::getPropertySlot):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeJSObjecth">trunk/Source/JavaScriptCore/runtime/JSObject.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (165089 => 165090)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2014-03-05 02:14:35 UTC (rev 165089)
+++ trunk/Source/JavaScriptCore/ChangeLog 2014-03-05 02:35:18 UTC (rev 165090)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2014-03-04 Andreas Kling <akling@apple.com>
+
+ Streamline JSValue::get().
+ <https://webkit.org/b/129720>
+
+ Fetch each Structure and VM only once when walking the prototype chain
+ in JSObject::getPropertySlot(), then pass it along to the functions
+ we call from there, so they don't have to re-fetch it.
+
+ Reviewed by Geoff Garen.
+
+ * runtime/JSObject.h:
+ (JSC::JSObject::inlineGetOwnPropertySlot):
+ (JSC::JSObject::fastGetOwnPropertySlot):
+ (JSC::JSObject::getPropertySlot):
+
</ins><span class="cx"> 2014-03-01 Filip Pizlo <fpizlo@apple.com>
</span><span class="cx">
</span><span class="cx"> DFG and FTL should specialize for and support CompareStrictEq over Misc (i.e. boolean, undefined, or null)
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeJSObjecth"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/JSObject.h (165089 => 165090)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/JSObject.h 2014-03-05 02:14:35 UTC (rev 165089)
+++ trunk/Source/JavaScriptCore/runtime/JSObject.h 2014-03-05 02:35:18 UTC (rev 165090)
</span><span class="lines">@@ -120,7 +120,7 @@
</span><span class="cx"> JSValue get(ExecState*, PropertyName) const;
</span><span class="cx"> JSValue get(ExecState*, unsigned propertyName) const;
</span><span class="cx">
</span><del>- bool fastGetOwnPropertySlot(ExecState*, PropertyName, PropertySlot&);
</del><ins>+ bool fastGetOwnPropertySlot(ExecState*, VM&, Structure&, PropertyName, PropertySlot&);
</ins><span class="cx"> bool getPropertySlot(ExecState*, PropertyName, PropertySlot&);
</span><span class="cx"> bool getPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
</span><span class="cx">
</span><span class="lines">@@ -949,7 +949,7 @@
</span><span class="cx"> template<PutMode>
</span><span class="cx"> bool putDirectInternal(VM&, PropertyName, JSValue, unsigned attr, PutPropertySlot&, JSCell*);
</span><span class="cx">
</span><del>- bool inlineGetOwnPropertySlot(ExecState*, PropertyName, PropertySlot&);
</del><ins>+ bool inlineGetOwnPropertySlot(ExecState*, VM&, Structure&, PropertyName, PropertySlot&);
</ins><span class="cx"> JS_EXPORT_PRIVATE void fillGetterPropertySlot(PropertySlot&, JSValue, unsigned, PropertyOffset);
</span><span class="cx">
</span><span class="cx"> const HashEntry* findPropertyHashEntry(VM&, PropertyName) const;
</span><span class="lines">@@ -1204,16 +1204,14 @@
</span><span class="cx"> return structure()->storedPrototype();
</span><span class="cx"> }
</span><span class="cx">
</span><del>-ALWAYS_INLINE bool JSObject::inlineGetOwnPropertySlot(ExecState* exec, PropertyName propertyName, PropertySlot& slot)
</del><ins>+ALWAYS_INLINE bool JSObject::inlineGetOwnPropertySlot(ExecState* exec, VM& vm, Structure& structure, PropertyName propertyName, PropertySlot& slot)
</ins><span class="cx"> {
</span><span class="cx"> unsigned attributes;
</span><span class="cx"> JSCell* specific;
</span><del>- VM& vm = exec->vm();
- Structure* structure = this->structure(vm);
- PropertyOffset offset = structure->get(vm, propertyName, attributes, specific);
</del><ins>+ PropertyOffset offset = structure.get(vm, propertyName, attributes, specific);
</ins><span class="cx"> if (LIKELY(isValidOffset(offset))) {
</span><span class="cx"> JSValue value = getDirect(offset);
</span><del>- if (structure->hasGetterSetterProperties() && value.isGetterSetter())
</del><ins>+ if (structure.hasGetterSetterProperties() && value.isGetterSetter())
</ins><span class="cx"> fillGetterPropertySlot(slot, value, attributes, offset);
</span><span class="cx"> else
</span><span class="cx"> slot.setValue(this, attributes, value, offset);
</span><span class="lines">@@ -1228,26 +1226,29 @@
</span><span class="cx"> // base class call to this.
</span><span class="cx"> ALWAYS_INLINE bool JSObject::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
</span><span class="cx"> {
</span><del>- return object->inlineGetOwnPropertySlot(exec, propertyName, slot);
</del><ins>+ VM& vm = exec->vm();
+ Structure& structure = *object->structure(vm);
+ return object->inlineGetOwnPropertySlot(exec, vm, structure, propertyName, slot);
</ins><span class="cx"> }
</span><span class="cx">
</span><del>-ALWAYS_INLINE bool JSObject::fastGetOwnPropertySlot(ExecState* exec, PropertyName propertyName, PropertySlot& slot)
</del><ins>+ALWAYS_INLINE bool JSObject::fastGetOwnPropertySlot(ExecState* exec, VM& vm, Structure& structure, PropertyName propertyName, PropertySlot& slot)
</ins><span class="cx"> {
</span><del>- VM& vm = exec->vm();
- if (!structure(vm)->typeInfo().overridesGetOwnPropertySlot())
- return asObject(this)->inlineGetOwnPropertySlot(exec, propertyName, slot);
- return methodTable(vm)->getOwnPropertySlot(this, exec, propertyName, slot);
</del><ins>+ if (!structure.typeInfo().overridesGetOwnPropertySlot())
+ return asObject(this)->inlineGetOwnPropertySlot(exec, vm, structure, propertyName, slot);
+ return structure.classInfo()->methodTable.getOwnPropertySlot(this, exec, propertyName, slot);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> // It may seem crazy to inline a function this large but it makes a big difference
</span><span class="cx"> // since this is function very hot in variable lookup
</span><span class="cx"> ALWAYS_INLINE bool JSObject::getPropertySlot(ExecState* exec, PropertyName propertyName, PropertySlot& slot)
</span><span class="cx"> {
</span><ins>+ VM& vm = exec->vm();
</ins><span class="cx"> JSObject* object = this;
</span><span class="cx"> while (true) {
</span><del>- if (object->fastGetOwnPropertySlot(exec, propertyName, slot))
</del><ins>+ Structure& structure = *object->structure(vm);
+ if (object->fastGetOwnPropertySlot(exec, vm, structure, propertyName, slot))
</ins><span class="cx"> return true;
</span><del>- JSValue prototype = object->prototype();
</del><ins>+ JSValue prototype = structure.storedPrototype();
</ins><span class="cx"> if (!prototype.isObject())
</span><span class="cx"> return false;
</span><span class="cx"> object = asObject(prototype);
</span></span></pre>
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