testing

third_party/WebKit/Source/core/fetch/MemoryCache.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 36 matching lines @@
 static const float cTargetPrunePercentage = .95f; // Percentage of capacity toward which we prune, to avoid immediately pruning again.
 
 MemoryCache* memoryCache()
 {
     ASSERT(WTF::isMainThread());
     if (!gMemoryCache)
         gMemoryCache = new Persistent<MemoryCache>(MemoryCache::create());
     return gMemoryCache->get();
 }
 
+void shutdownCache()
+{
+    *gMemoryCache = nullptr;

[haraken, 2015/10/14 00:49:01]

I now realized that this approach won't work... (I should have noticed it
eariler, sorry :-)

One renderer process can be shared among multiple tabs. This means that
gMemoryCache is per-process, not per-tab. Also WebKit::shutdown() can be called
multiple times. If we clear the gMemoryCache in WebKit::shutdown(), it can crash
tabs running on the same renderer process.

+    delete gMemoryCache;
+}
+
 MemoryCache* replaceMemoryCacheForTesting(MemoryCache* cache)
 {
 #if ENABLE(OILPAN)
     // Move m_liveResources content to keep Resource objects alive.
     for (const auto& resource : memoryCache()->m_liveResources)
         cache->m_liveResources.add(resource);
     memoryCache()->m_liveResources.clear();
 #endif
     memoryCache();
     MemoryCache* oldCache = gMemoryCache->release();
@@ skipping 767 matching lines @@
                 printf("(%.1fK, %.1fK, %uA, %dR, %d, %d); ", currentResource->decodedSize() / 1024.0f, (currentResource->encodedSize() + currentResource->overheadSize()) / 1024.0f, current->m_accessCount, currentResource->hasClients(), currentResource->isPurgeable(), currentResource->wasPurged());
 
             current = current->m_previousInAllResourcesList;
         }
     }
 }
 
 #endif // MEMORY_CACHE_STATS
 
 } // namespace blink