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<title>[170161] branches/ftlopt/Source/JavaScriptCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/170161">170161</a></dd>
<dt>Author</dt> <dd>fpizlo@apple.com</dd>
<dt>Date</dt> <dd>2014-06-19 14:51:27 -0700 (Thu, 19 Jun 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>[ftlopt] StructureSet::onlyStructure() should return nullptr if it's not a singleton (instead of asserting)
https://bugs.webkit.org/show_bug.cgi?id=134077
Reviewed by Sam Weinig.
This makes StructureSet and StructureAbstractValue more consistent and fixes a debug assert
in the abstract interpreter.
* bytecode/StructureSet.h:
(JSC::StructureSet::onlyStructure):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchesftloptSourceJavaScriptCoreChangeLog">branches/ftlopt/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchesftloptSourceJavaScriptCorebytecodeStructureSeth">branches/ftlopt/Source/JavaScriptCore/bytecode/StructureSet.h</a></li>
</ul>
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<h3>Diff</h3>
<a id="branchesftloptSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/ftlopt/Source/JavaScriptCore/ChangeLog (170160 => 170161)</h4>
<pre class="diff"><span>
<span class="info">--- branches/ftlopt/Source/JavaScriptCore/ChangeLog 2014-06-19 20:54:21 UTC (rev 170160)
+++ branches/ftlopt/Source/JavaScriptCore/ChangeLog 2014-06-19 21:51:27 UTC (rev 170161)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2014-06-19 Filip Pizlo <fpizlo@apple.com>
+
+ [ftlopt] StructureSet::onlyStructure() should return nullptr if it's not a singleton (instead of asserting)
+ https://bugs.webkit.org/show_bug.cgi?id=134077
+
+ Reviewed by Sam Weinig.
+
+ This makes StructureSet and StructureAbstractValue more consistent and fixes a debug assert
+ in the abstract interpreter.
+
+ * bytecode/StructureSet.h:
+ (JSC::StructureSet::onlyStructure):
+
</ins><span class="cx"> 2014-06-18 Filip Pizlo <fpizlo@apple.com>
</span><span class="cx">
</span><span class="cx"> DFG AI and constant folder should be able to precisely prune MultiGetByOffset/MultiPutByOffset even if the base structure abstract value is not a singleton
</span></span></pre></div>
<a id="branchesftloptSourceJavaScriptCorebytecodeStructureSeth"></a>
<div class="modfile"><h4>Modified: branches/ftlopt/Source/JavaScriptCore/bytecode/StructureSet.h (170160 => 170161)</h4>
<pre class="diff"><span>
<span class="info">--- branches/ftlopt/Source/JavaScriptCore/bytecode/StructureSet.h 2014-06-19 20:54:21 UTC (rev 170160)
+++ branches/ftlopt/Source/JavaScriptCore/bytecode/StructureSet.h 2014-06-19 21:51:27 UTC (rev 170161)
</span><span class="lines">@@ -73,12 +73,12 @@
</span><span class="cx">
</span><span class="cx"> Structure* onlyStructure() const
</span><span class="cx"> {
</span><del>- if (isThin()) {
- ASSERT(singleStructure());
</del><ins>+ if (isThin())
</ins><span class="cx"> return singleStructure();
</span><del>- }
- ASSERT(structureList()->m_length == 1);
- return structureList()->list()[0];
</del><ins>+ OutOfLineList* list = structureList();
+ if (list->m_length != 1)
+ return nullptr;
+ return list->list()[0];
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool isEmpty() const
</span></span></pre>
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