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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/245710">245710</a></dd>
<dt>Author</dt> <dd>tzagallo@apple.com</dd>
<dt>Date</dt> <dd>2019-05-23 13:43:49 -0700 (Thu, 23 May 2019)</dd>
</dl>
<h3>Log Message</h3>
<pre>DFG::OSREntry should not perform arity check
https://bugs.webkit.org/show_bug.cgi?id=198189
Reviewed by Saam Barati.
JSTests:
* microbenchmarks/loop-osr-with-arity-mismatch.js: Added.
(foo):
Source/JavaScriptCore:
The check prevents OSR entering from hot loops inside functions that were called
with too few arguments.
* dfg/DFGOSREntry.cpp:
(JSC::DFG::prepareOSREntry):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkJSTestsChangeLog">trunk/JSTests/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGOSREntrycpp">trunk/Source/JavaScriptCore/dfg/DFGOSREntry.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkJSTestsmicrobenchmarkslooposrwitharitymismatchjs">trunk/JSTests/microbenchmarks/loop-osr-with-arity-mismatch.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkJSTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/JSTests/ChangeLog (245709 => 245710)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/JSTests/ChangeLog 2019-05-23 20:23:01 UTC (rev 245709)
+++ trunk/JSTests/ChangeLog 2019-05-23 20:43:49 UTC (rev 245710)
</span><span class="lines">@@ -1,3 +1,13 @@
</span><ins>+2019-05-23 Tadeu Zagallo <tzagallo@apple.com>
+
+ DFG::OSREntry should not perform arity check
+ https://bugs.webkit.org/show_bug.cgi?id=198189
+
+ Reviewed by Saam Barati.
+
+ * microbenchmarks/loop-osr-with-arity-mismatch.js: Added.
+ (foo):
+
</ins><span class="cx"> 2019-05-23 Stephan Szabo <stephan.szabo@sony.com>
</span><span class="cx">
</span><span class="cx"> [PlayStation] Skip additional tests on PlayStation
</span></span></pre></div>
<a id="trunkJSTestsmicrobenchmarkslooposrwitharitymismatchjs"></a>
<div class="addfile"><h4>Added: trunk/JSTests/microbenchmarks/loop-osr-with-arity-mismatch.js (0 => 245710)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/JSTests/microbenchmarks/loop-osr-with-arity-mismatch.js (rev 0)
+++ trunk/JSTests/microbenchmarks/loop-osr-with-arity-mismatch.js 2019-05-23 20:43:49 UTC (rev 245710)
</span><span class="lines">@@ -0,0 +1,6 @@
</span><ins>+function foo(x, y) {
+ for (var i = 0; i < 1e7; i++) {
+ x[y] += i;
+ }
+}
+foo({})
</ins></span></pre></div>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (245709 => 245710)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2019-05-23 20:23:01 UTC (rev 245709)
+++ trunk/Source/JavaScriptCore/ChangeLog 2019-05-23 20:43:49 UTC (rev 245710)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2019-05-23 Tadeu Zagallo <tzagallo@apple.com>
+
+ DFG::OSREntry should not perform arity check
+ https://bugs.webkit.org/show_bug.cgi?id=198189
+
+ Reviewed by Saam Barati.
+
+ The check prevents OSR entering from hot loops inside functions that were called
+ with too few arguments.
+
+ * dfg/DFGOSREntry.cpp:
+ (JSC::DFG::prepareOSREntry):
+
</ins><span class="cx"> 2019-05-23 Ross Kirsling <ross.kirsling@sony.com>
</span><span class="cx">
</span><span class="cx"> Lexer<T>::parseDecimal ought to ASSERT isASCIIDigit
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGOSREntrycpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGOSREntry.cpp (245709 => 245710)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGOSREntry.cpp 2019-05-23 20:23:01 UTC (rev 245709)
+++ trunk/Source/JavaScriptCore/dfg/DFGOSREntry.cpp 2019-05-23 20:43:49 UTC (rev 245710)
</span><span class="lines">@@ -177,15 +177,6 @@
</span><span class="cx"> // OSR at this time.
</span><span class="cx">
</span><span class="cx"> for (size_t argument = 0; argument < entry->m_expectedValues.numberOfArguments(); ++argument) {
</span><del>- if (argument >= exec->argumentCountIncludingThis()) {
- if (Options::verboseOSR()) {
- dataLogF(" OSR failed because argument %zu was not passed, expected ", argument);
- entry->m_expectedValues.argument(argument).dump(WTF::dataFile());
- dataLogF(".\n");
- }
- return nullptr;
- }
-
</del><span class="cx"> JSValue value;
</span><span class="cx"> if (!argument)
</span><span class="cx"> value = exec->thisValue();
</span></span></pre>
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