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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/191660">191660</a></dd>
<dt>Author</dt> <dd>matthew_hanson@apple.com</dd>
<dt>Date</dt> <dd>2015-10-28 00:56:53 -0700 (Wed, 28 Oct 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/191395">r191395</a>. rdar://problem/22846455</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari601146branchSourceJavaScriptCoreChangeLog">branches/safari-601.1.46-branch/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchessafari601146branchSourceJavaScriptCoredfgDFGPlancpp">branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp</a></li>
<li><a href="#branchessafari601146branchSourceJavaScriptCoredfgDFGPutStackSinkingPhasecpp">branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPutStackSinkingPhase.cpp</a></li>
<li><a href="#branchessafari601146branchSourceJavaScriptCoreruntimeOptionsh">branches/safari-601.1.46-branch/Source/JavaScriptCore/runtime/Options.h</a></li>
<li><a href="#branchessafari601146branchToolsChangeLog">branches/safari-601.1.46-branch/Tools/ChangeLog</a></li>
<li><a href="#branchessafari601146branchToolsScriptsrunjscstresstests">branches/safari-601.1.46-branch/Tools/Scripts/run-jsc-stress-tests</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari601146branchSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-601.1.46-branch/Source/JavaScriptCore/ChangeLog (191659 => 191660)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-601.1.46-branch/Source/JavaScriptCore/ChangeLog 2015-10-28 07:56:48 UTC (rev 191659)
+++ branches/safari-601.1.46-branch/Source/JavaScriptCore/ChangeLog 2015-10-28 07:56:53 UTC (rev 191660)
</span><span class="lines">@@ -1,5 +1,24 @@
</span><span class="cx"> 2015-10-27 Matthew Hanson <matthew_hanson@apple.com>
</span><span class="cx">
</span><ins>+ Merge r191395. rdar://problem/22846455
+
+ 2015-10-21 Filip Pizlo <fpizlo@apple.com>
+
+ Failures in PutStackSinkingPhase should be less severe
+ https://bugs.webkit.org/show_bug.cgi?id=150400
+
+ Reviewed by Geoffrey Garen.
+
+ Make the PutStackSinkingPhase abort instead of asserting. To test that it's OK to not have
+ PutStackSinkingPhase run, this adds a test mode where we run without PutStackSinkingPhase.
+
+ * dfg/DFGPlan.cpp: Make it possible to not run PutStackSinkingPhase for tests.
+ (JSC::DFG::Plan::compileInThreadImpl):
+ * dfg/DFGPutStackSinkingPhase.cpp: PutStackSinkingPhase should abort instead of asserting, except when validation is enabled.
+ * runtime/Options.h: Add an option for disabling PutStackSinkingPhase.
+
+2015-10-27 Matthew Hanson <matthew_hanson@apple.com>
+
</ins><span class="cx"> Merge r187510. rdar://problem/22846455
</span><span class="cx">
</span><span class="cx"> 2015-07-28 Filip Pizlo <fpizlo@apple.com>
</span></span></pre></div>
<a id="branchessafari601146branchSourceJavaScriptCoredfgDFGPlancpp"></a>
<div class="modfile"><h4>Modified: branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp (191659 => 191660)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp 2015-10-28 07:56:48 UTC (rev 191659)
+++ branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp 2015-10-28 07:56:53 UTC (rev 191660)
</span><span class="lines">@@ -354,7 +354,8 @@
</span><span class="cx">
</span><span class="cx"> // Ideally, these would be run to fixpoint with the object allocation sinking phase.
</span><span class="cx"> performArgumentsElimination(dfg);
</span><del>- performPutStackSinking(dfg);
</del><ins>+ if (Options::usePutStackSinking())
+ performPutStackSinking(dfg);
</ins><span class="cx">
</span><span class="cx"> performConstantHoisting(dfg);
</span><span class="cx"> performGlobalCSE(dfg);
</span></span></pre></div>
<a id="branchessafari601146branchSourceJavaScriptCoredfgDFGPutStackSinkingPhasecpp"></a>
<div class="modfile"><h4>Modified: branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPutStackSinkingPhase.cpp (191659 => 191660)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPutStackSinkingPhase.cpp 2015-10-28 07:56:48 UTC (rev 191659)
+++ branches/safari-601.1.46-branch/Source/JavaScriptCore/dfg/DFGPutStackSinkingPhase.cpp 2015-10-28 07:56:53 UTC (rev 191660)
</span><span class="lines">@@ -231,10 +231,39 @@
</span><span class="cx"> dataLog("Deferred at ", node, ":", deferred, "\n");
</span><span class="cx">
</span><span class="cx"> if (node->op() == GetStack) {
</span><del>- DFG_ASSERT(
- m_graph, node,
- deferred.operand(node->stackAccessData()->local) != ConflictingFlush);
</del><ins>+ // Handle the case that the input doesn't match our requirements. This is
+ // really a bug, but it's a benign one if we simply don't run this phase.
+ // It usually arises because of patterns like:
+ //
+ // if (thing)
+ // PutStack()
+ // ...
+ // if (thing)
+ // GetStack()
+ //
+ // Or:
+ //
+ // if (never happens)
+ // GetStack()
+ //
+ // Because this phase runs early in SSA, it should be sensible to enforce
+ // that no such code pattern has arisen yet. So, when validation is
+ // enabled, we assert that we aren't seeing this. But with validation
+ // disabled we silently let this fly and we just abort this phase.
+ // FIXME: Get rid of all remaining cases of conflicting GetStacks.
+ // https://bugs.webkit.org/show_bug.cgi?id=150398
+
+ bool isConflicting =
+ deferred.operand(node->stackAccessData()->local) == ConflictingFlush;
</ins><span class="cx">
</span><ins>+ if (validationEnabled())
+ DFG_ASSERT(m_graph, node, !isConflicting);
+
+ if (isConflicting) {
+ // Oh noes! Abort!!
+ return false;
+ }
+
</ins><span class="cx"> // A GetStack doesn't affect anything, since we know which local we are reading
</span><span class="cx"> // from.
</span><span class="cx"> continue;
</span></span></pre></div>
<a id="branchessafari601146branchSourceJavaScriptCoreruntimeOptionsh"></a>
<div class="modfile"><h4>Modified: branches/safari-601.1.46-branch/Source/JavaScriptCore/runtime/Options.h (191659 => 191660)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-601.1.46-branch/Source/JavaScriptCore/runtime/Options.h 2015-10-28 07:56:48 UTC (rev 191659)
+++ branches/safari-601.1.46-branch/Source/JavaScriptCore/runtime/Options.h 2015-10-28 07:56:53 UTC (rev 191660)
</span><span class="lines">@@ -190,6 +190,7 @@
</span><span class="cx"> v(bool, optimizeNativeCalls, false, nullptr) \
</span><span class="cx"> v(bool, enableMovHintRemoval, true, nullptr) \
</span><span class="cx"> v(bool, enableObjectAllocationSinking, true, nullptr) \
</span><ins>+ v(bool, usePutStackSinking, true, nullptr) \
</ins><span class="cx"> \
</span><span class="cx"> v(bool, enableConcurrentJIT, true, "allows the DFG / FTL compilation in threads other than the executing JS thread") \
</span><span class="cx"> v(unsigned, numberOfDFGCompilerThreads, computeNumberOfWorkerThreads(2, 2) - 1, nullptr) \
</span></span></pre></div>
<a id="branchessafari601146branchToolsChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-601.1.46-branch/Tools/ChangeLog (191659 => 191660)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-601.1.46-branch/Tools/ChangeLog 2015-10-28 07:56:48 UTC (rev 191659)
+++ branches/safari-601.1.46-branch/Tools/ChangeLog 2015-10-28 07:56:53 UTC (rev 191660)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2015-10-27 Matthew Hanson <matthew_hanson@apple.com>
+
+ Merge r191395. rdar://problem/22846455
+
+ 2015-10-21 Filip Pizlo <fpizlo@apple.com>
+
+ Failures in PutStackSinkingPhase should be less severe
+ https://bugs.webkit.org/show_bug.cgi?id=150400
+
+ Reviewed by Geoffrey Garen.
+
+ Add a test mode for no PutStackSinkingPhase.
+
+ * Scripts/run-jsc-stress-tests:
+
</ins><span class="cx"> 2015-10-21 Matthew Hanson <matthew_hanson@apple.com>
</span><span class="cx">
</span><span class="cx"> Rollout r191395. rdar://problem/22846455
</span></span></pre></div>
<a id="branchessafari601146branchToolsScriptsrunjscstresstests"></a>
<div class="modfile"><h4>Modified: branches/safari-601.1.46-branch/Tools/Scripts/run-jsc-stress-tests (191659 => 191660)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-601.1.46-branch/Tools/Scripts/run-jsc-stress-tests 2015-10-28 07:56:48 UTC (rev 191659)
+++ branches/safari-601.1.46-branch/Tools/Scripts/run-jsc-stress-tests 2015-10-28 07:56:53 UTC (rev 191660)
</span><span class="lines">@@ -710,6 +710,10 @@
</span><span class="cx"> run("ftl-no-cjit-validate", "--validateGraph=true", *(FTL_OPTIONS + NO_CJIT_OPTIONS)) if $enableFTL
</span><span class="cx"> end
</span><span class="cx">
</span><ins>+def runFTLNoCJITNoPutStackValidate
+ run("ftl-no-cjit-no-put-stack-validate", "--validateGraph=true", "--usePutStackSinking=false", *(FTL_OPTIONS + NO_CJIT_OPTIONS)) if $enableFTL
+end
+
</ins><span class="cx"> def runFTLNoCJITNoInlineValidate
</span><span class="cx"> run("ftl-no-cjit-no-inline-validate", "--validateGraph=true", "--maximumInliningDepth=1", *(FTL_OPTIONS + NO_CJIT_OPTIONS)) if $enableFTL
</span><span class="cx"> end
</span><span class="lines">@@ -773,6 +777,7 @@
</span><span class="cx"> runDefaultFTL
</span><span class="cx"> runFTLNoCJITValidate
</span><span class="cx"> runFTLNoCJITNoInlineValidate
</span><ins>+ runFTLNoCJITNoPutStackValidate
</ins><span class="cx"> runFTLEager
</span><span class="cx"> runFTLEagerNoCJITValidate
</span><span class="cx"> runFTLNoCJITSmallPool
</span></span></pre>
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