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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/170769">170769</a></dd>
<dt>Author</dt> <dd>fpizlo@apple.com</dd>
<dt>Date</dt> <dd>2014-07-03 14:04:07 -0700 (Thu, 03 Jul 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>SSA DCE should process blocks in forward order
https://bugs.webkit.org/show_bug.cgi?id=134611
Reviewed by Andreas Kling.
* dfg/DFGDCEPhase.cpp:
(JSC::DFG::DCEPhase::run):
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::LowerDFGToLLVM::addExitArgumentForNode):
* tests/stress/dead-value-with-mov-hint-in-another-block.js: Added.
(foo):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGDCEPhasecpp">trunk/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreftlFTLLowerDFGToLLVMcpp">trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoretestsstressdeadvaluewithmovhintinanotherblockjs">trunk/Source/JavaScriptCore/tests/stress/dead-value-with-mov-hint-in-another-block.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (170768 => 170769)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2014-07-03 21:04:06 UTC (rev 170768)
+++ trunk/Source/JavaScriptCore/ChangeLog 2014-07-03 21:04:07 UTC (rev 170769)
</span><span class="lines">@@ -1,5 +1,19 @@
</span><span class="cx"> 2014-07-03 Filip Pizlo <fpizlo@apple.com>
</span><span class="cx">
</span><ins>+ SSA DCE should process blocks in forward order
+ https://bugs.webkit.org/show_bug.cgi?id=134611
+
+ Reviewed by Andreas Kling.
+
+ * dfg/DFGDCEPhase.cpp:
+ (JSC::DFG::DCEPhase::run):
+ * ftl/FTLLowerDFGToLLVM.cpp:
+ (JSC::FTL::LowerDFGToLLVM::addExitArgumentForNode):
+ * tests/stress/dead-value-with-mov-hint-in-another-block.js: Added.
+ (foo):
+
+2014-07-03 Filip Pizlo <fpizlo@apple.com>
+
</ins><span class="cx"> JSActivation::symbolTablePut() should invalidate variable watchpoints
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=134602
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGDCEPhasecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp (170768 => 170769)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp 2014-07-03 21:04:06 UTC (rev 170768)
+++ trunk/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp 2014-07-03 21:04:07 UTC (rev 170769)
</span><span class="lines">@@ -106,11 +106,9 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> if (m_graph.m_form == SSA) {
</span><del>- // Need to process the graph in reverse DFS order, so that we get to the uses
- // of a node before we get to the node itself.
</del><span class="cx"> Vector<BasicBlock*> depthFirst;
</span><span class="cx"> m_graph.getBlocksInDepthFirstOrder(depthFirst);
</span><del>- for (unsigned i = depthFirst.size(); i--;)
</del><ins>+ for (unsigned i = 0; i < depthFirst.size(); ++i)
</ins><span class="cx"> fixupBlock(depthFirst[i]);
</span><span class="cx"> } else {
</span><span class="cx"> RELEASE_ASSERT(m_graph.m_form == ThreadedCPS);
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreftlFTLLowerDFGToLLVMcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp (170768 => 170769)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp 2014-07-03 21:04:06 UTC (rev 170768)
+++ trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp 2014-07-03 21:04:07 UTC (rev 170769)
</span><span class="lines">@@ -5874,7 +5874,9 @@
</span><span class="cx"> return;
</span><span class="cx"> }
</span><span class="cx">
</span><del>- dataLog("Cannot find value for node: ", node, "\n");
</del><ins>+ startCrashing();
+ dataLog("Cannot find value for node: ", node, " while compiling exit at ", exit.m_codeOrigin, " in node ", m_node, "\n");
+ m_graph.dump();
</ins><span class="cx"> RELEASE_ASSERT_NOT_REACHED();
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoretestsstressdeadvaluewithmovhintinanotherblockjs"></a>
<div class="addfile"><h4>Added: trunk/Source/JavaScriptCore/tests/stress/dead-value-with-mov-hint-in-another-block.js (0 => 170769)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/tests/stress/dead-value-with-mov-hint-in-another-block.js (rev 0)
+++ trunk/Source/JavaScriptCore/tests/stress/dead-value-with-mov-hint-in-another-block.js 2014-07-03 21:04:07 UTC (rev 170769)
</span><span class="lines">@@ -0,0 +1,17 @@
</span><ins>+function foo(a, b, p, o) {
+ var x = a + b;
+ if (p) {
+ var y = x;
+ var result = o.f.f;
+ var z = y + 1;
+ return result;
+ }
+}
+
+noInline(foo);
+
+for (var i = 0; i < 100000; ++i) {
+ var result = foo(1, 2, true, {f:{f:42}});
+ if (result != 42)
+ throw "Error: bad result: " + result;
+}
</ins></span></pre>
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