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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/214519">214519</a></dd>
<dt>Author</dt> <dd>jmarcell@apple.com</dd>
<dt>Date</dt> <dd>2017-03-28 20:28:18 -0700 (Tue, 28 Mar 2017)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/212310">r212310</a>. rdar://problem/30922106</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari603branchSourceJavaScriptCoreChangeLog">branches/safari-603-branch/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoreheapHeapcpp">branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.cpp</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoreheapHeaph">branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.h</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoreruntimeOptionscpp">branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.cpp</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoreruntimeOptionsh">branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari603branchSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/ChangeLog (214518 => 214519)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/ChangeLog 2017-03-29 03:28:15 UTC (rev 214518)
+++ branches/safari-603-branch/Source/JavaScriptCore/ChangeLog 2017-03-29 03:28:18 UTC (rev 214519)
</span><span class="lines">@@ -1,5 +1,35 @@
</span><span class="cx"> 2017-03-28 Jason Marcell <jmarcell@apple.com>
</span><span class="cx">
</span><ins>+ Merge r212310. rdar://problem/30922106
+
+ 2017-02-14 Mark Lam <mark.lam@apple.com>
+
+ Add JSC_sweepSynchronously and fix JSC_useZombieMode options.
+ https://bugs.webkit.org/show_bug.cgi?id=168257
+ <rdar://problem/30451496>
+
+ Reviewed by Filip Pizlo.
+
+ JSC_useZombieMode now basically enables JSC_sweepSynchronously and
+ JSC_scribbleFreeCells, which together does the job of zombifying dead objects
+ immediately after a GC.
+
+ * heap/Heap.cpp:
+ (JSC::Heap::sweepSynchronously):
+ (JSC::Heap::collectAllGarbage):
+ (JSC::Heap::finalize):
+ (JSC::Heap::didFinishCollection):
+ (JSC::Zombify::visit): Deleted.
+ (JSC::Zombify::operator()): Deleted.
+ (JSC::Heap::zombifyDeadObjects): Deleted.
+ * heap/Heap.h:
+ (JSC::Heap::isZombified): Deleted.
+ * runtime/Options.cpp:
+ (JSC::recomputeDependentOptions):
+ * runtime/Options.h:
+
+2017-03-28 Jason Marcell <jmarcell@apple.com>
+
</ins><span class="cx"> Merge r213966. rdar://problem/31178551
</span><span class="cx">
</span><span class="cx"> 2017-03-14 Mark Lam <mark.lam@apple.com>
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoreheapHeapcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.cpp (214518 => 214519)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.cpp 2017-03-29 03:28:15 UTC (rev 214518)
+++ branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.cpp 2017-03-29 03:28:18 UTC (rev 214519)
</span><span class="lines">@@ -1019,6 +1019,21 @@
</span><span class="cx"> m_mutatorMarkStack->append(cell);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void Heap::sweepSynchronously()
+{
+ double before = 0;
+ if (Options::logGC()) {
+ dataLog("[Full sweep: ", capacity() / 1024, "kb ");
+ before = currentTimeMS();
+ }
+ m_objectSpace.sweep();
+ m_objectSpace.shrink();
+ if (Options::logGC()) {
+ double after = currentTimeMS();
+ dataLog("=> ", capacity() / 1024, "kb, ", after - before, "ms] ");
+ }
+}
+
</ins><span class="cx"> void Heap::collectAllGarbage()
</span><span class="cx"> {
</span><span class="cx"> if (!m_isSafeToCollect)
</span><span class="lines">@@ -1029,18 +1044,12 @@
</span><span class="cx"> DeferGCForAWhile deferGC(*this);
</span><span class="cx"> if (UNLIKELY(Options::useImmortalObjects()))
</span><span class="cx"> sweeper()->willFinishSweeping();
</span><del>- else {
- double before = 0;
- if (Options::logGC()) {
- dataLog("[Full sweep: ", capacity() / 1024, "kb ");
- before = currentTimeMS();
- }
- m_objectSpace.sweep();
- m_objectSpace.shrink();
- if (Options::logGC()) {
- double after = currentTimeMS();
- dataLog("=> ", capacity() / 1024, "kb, ", after - before, "ms]\n");
- }
</del><ins>+
+ bool alreadySweptInCollectSync = Options::sweepSynchronously();
+ if (!alreadySweptInCollectSync) {
+ sweepSynchronously();
+ if (Options::logGC())
+ dataLog("\n");
</ins><span class="cx"> }
</span><span class="cx"> m_objectSpace.assertNoUnswept();
</span><span class="cx">
</span><span class="lines">@@ -1579,6 +1588,9 @@
</span><span class="cx">
</span><span class="cx"> if (HasOwnPropertyCache* cache = vm()->hasOwnPropertyCache())
</span><span class="cx"> cache->clear();
</span><ins>+
+ if (Options::sweepSynchronously())
+ sweepSynchronously();
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> Heap::Ticket Heap::requestCollection(std::optional<CollectionScope> scope)
</span><span class="lines">@@ -1807,9 +1819,6 @@
</span><span class="cx"> if (Options::recordGCPauseTimes())
</span><span class="cx"> HeapStatistics::recordGCPauseTime(gcStartTime, gcEndTime);
</span><span class="cx">
</span><del>- if (Options::useZombieMode())
- zombifyDeadObjects();
-
</del><span class="cx"> if (Options::dumpObjectStatistics())
</span><span class="cx"> HeapStatistics::dumpObjectStatistics(this);
</span><span class="cx">
</span><span class="lines">@@ -1910,36 +1919,6 @@
</span><span class="cx"> collectAllGarbage();
</span><span class="cx"> }
</span><span class="cx">
</span><del>-class Zombify : public MarkedBlock::VoidFunctor {
-public:
- inline void visit(HeapCell* cell) const
- {
- void** current = reinterpret_cast_ptr<void**>(cell);
-
- // We want to maintain zapped-ness because that's how we know if we've called
- // the destructor.
- if (cell->isZapped())
- current++;
-
- void* limit = static_cast<void*>(reinterpret_cast<char*>(cell) + cell->cellSize());
- for (; current < limit; current++)
- *current = zombifiedBits;
- }
- IterationStatus operator()(HeapCell* cell, HeapCell::Kind) const
- {
- visit(cell);
- return IterationStatus::Continue;
- }
-};
-
-void Heap::zombifyDeadObjects()
-{
- // Sweep now because destructors will crash once we're zombified.
- m_objectSpace.sweep();
- HeapIterationScope iterationScope(*this);
- m_objectSpace.forEachDeadCell(iterationScope, Zombify());
-}
-
</del><span class="cx"> bool Heap::shouldDoFullCollection(std::optional<CollectionScope> scope) const
</span><span class="cx"> {
</span><span class="cx"> if (!Options::useGenerationalGC())
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoreheapHeaph"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.h (214518 => 214519)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.h 2017-03-29 03:28:15 UTC (rev 214518)
+++ branches/safari-603-branch/Source/JavaScriptCore/heap/Heap.h 2017-03-29 03:28:18 UTC (rev 214519)
</span><span class="lines">@@ -85,8 +85,6 @@
</span><span class="cx"> class Worklist;
</span><span class="cx"> }
</span><span class="cx">
</span><del>-static void* const zombifiedBits = reinterpret_cast<void*>(static_cast<uintptr_t>(0xdeadbeef));
-
</del><span class="cx"> typedef HashCountedSet<JSCell*> ProtectCountSet;
</span><span class="cx"> typedef HashCountedSet<const char*> TypeCountSet;
</span><span class="cx">
</span><span class="lines">@@ -167,6 +165,7 @@
</span><span class="cx">
</span><span class="cx"> JS_EXPORT_PRIVATE void collectAllGarbageIfNotDoneRecently();
</span><span class="cx"> JS_EXPORT_PRIVATE void collectAllGarbage();
</span><ins>+ JS_EXPORT_PRIVATE void sweepSynchronously();
</ins><span class="cx">
</span><span class="cx"> bool shouldCollectHeuristic();
</span><span class="cx">
</span><span class="lines">@@ -259,8 +258,6 @@
</span><span class="cx"> template<typename T> void releaseSoon(RetainPtr<T>&&);
</span><span class="cx"> #endif
</span><span class="cx">
</span><del>- static bool isZombified(JSCell* cell) { return *(void**)cell == zombifiedBits; }
-
</del><span class="cx"> JS_EXPORT_PRIVATE void registerWeakGCMap(void* weakGCMap, std::function<void()> pruningCallback);
</span><span class="cx"> JS_EXPORT_PRIVATE void unregisterWeakGCMap(void* weakGCMap);
</span><span class="cx">
</span><span class="lines">@@ -448,7 +445,6 @@
</span><span class="cx"> void updateAllocationLimits();
</span><span class="cx"> void didFinishCollection(double gcStartTime);
</span><span class="cx"> void resumeCompilerThreads();
</span><del>- void zombifyDeadObjects();
</del><span class="cx"> void gatherExtraHeapSnapshotData(HeapProfiler&);
</span><span class="cx"> void removeDeadHeapSnapshotNodes(HeapProfiler&);
</span><span class="cx"> void finalize();
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoreruntimeOptionscpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.cpp (214518 => 214519)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.cpp 2017-03-29 03:28:15 UTC (rev 214518)
+++ branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.cpp 2017-03-29 03:28:18 UTC (rev 214519)
</span><span class="lines">@@ -446,6 +446,12 @@
</span><span class="cx"> else
</span><span class="cx"> fastSetMaxSingleAllocationSize(std::numeric_limits<size_t>::max());
</span><span class="cx"> #endif
</span><ins>+
+ if (Options::useZombieMode()) {
+ Options::sweepSynchronously() = true;
+ Options::scribbleFreeCells() = true;
+ }
+
</ins><span class="cx"> if (Options::useSigillCrashAnalyzer())
</span><span class="cx"> enableSigillCrashAnalyzer();
</span><span class="cx"> }
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoreruntimeOptionsh"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h (214518 => 214519)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h 2017-03-29 03:28:15 UTC (rev 214518)
+++ branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h 2017-03-29 03:28:18 UTC (rev 214519)
</span><span class="lines">@@ -339,8 +339,9 @@
</span><span class="cx"> v(bool, forceWeakRandomSeed, false, Normal, nullptr) \
</span><span class="cx"> v(unsigned, forcedWeakRandomSeed, 0, Normal, nullptr) \
</span><span class="cx"> \
</span><del>- v(bool, useZombieMode, false, Normal, "debugging option to scribble over dead objects with 0xdeadbeef") \
</del><ins>+ v(bool, useZombieMode, false, Normal, "debugging option to scribble over dead objects with 0xbadbeef0") \
</ins><span class="cx"> v(bool, useImmortalObjects, false, Normal, "debugging option to keep all objects alive forever") \
</span><ins>+ v(bool, sweepSynchronously, false, Normal, "debugging option to sweep all dead objects synchronously at GC end before resuming mutator") \
</ins><span class="cx"> v(bool, dumpObjectStatistics, false, Normal, nullptr) \
</span><span class="cx"> v(unsigned, maxSingleAllocationSize, 0, Configurable, "debugging option to limit individual allocations to a max size (0 = limit not set, N = limit size in bytes)") \
</span><span class="cx"> \
</span></span></pre>
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