[tracing] Adding class-wise memory statistics to blink gc memory dumps

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/heap/ThreadState.h"
 
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/TraceEvent.h"
+#include "platform/heap/BlinkGCMemoryDumpProvider.h"
 #include "platform/heap/CallbackStack.h"
 #include "platform/heap/Handle.h"
 #include "platform/heap/Heap.h"
 #include "platform/heap/MarkingVisitor.h"
 #include "platform/heap/SafePoint.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebMemoryAllocatorDump.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/Partitions.h"
 #include "wtf/ThreadingPrimitives.h"
 #if ENABLE(GC_PROFILING)
 #include "platform/TracedValue.h"
 #include "wtf/text/StringHash.h"
 #endif
 
@@ skipping 321 matching lines @@
 
 void ThreadState::visitPersistents(Visitor* visitor)
 {
     m_persistents->tracePersistentNodes(visitor);
     if (m_traceDOMWrappers) {
         TRACE_EVENT0("blink_gc", "V8GCController::traceDOMWrappers");
         m_traceDOMWrappers(m_isolate, visitor);
     }
 }
 
+size_t ThreadState::GCSnapshotInfo::getClassTag(const GCInfo* gcInfo)
+{
+    ClassTagMap::AddResult result = classTags.add(gcInfo, classTags.size());
+    if (result.isNewEntry) {
+        liveCount.append(0);
+        deadCount.append(0);
+        liveSize.append(0);
+        deadSize.append(0);
+    }
+    return result.storedValue->value;
+}
+
 #if ENABLE(GC_PROFILING)
 const GCInfo* ThreadState::findGCInfo(Address address)
 {
     if (BasePage* page = findPageFromAddress(address))
         return page->findGCInfo(address);
     return nullptr;
 }
 
 size_t ThreadState::SnapshotInfo::getClassTag(const GCInfo* gcInfo)
 {
@@ skipping 978 matching lines @@
 
 void ThreadState::promptlyFreed(size_t gcInfoIndex)
 {
     size_t entryIndex = gcInfoIndex & likelyToBePromptlyFreedArrayMask;
     // See the comment in vectorBackingHeap() for why this is +3.
     m_likelyToBePromptlyFreed[entryIndex] += 3;
 }
 
 void ThreadState::takeSnapshot(SnapshotType type)
 {
+    GCSnapshotInfo info;
     ASSERT(isInGC());
 
     int numberOfHeapsReported = 0;
 #define SNAPSHOT_HEAP(HeapType)                                                                                \
     {                                                                                                          \
         numberOfHeapsReported++;                                                                               \
         String allocatorBaseName;                                                                              \
         allocatorBaseName = String::format("blink_gc/thread_%lu/heaps/" #HeapType, (unsigned long)(m_thread)); \
         switch (type) {                                                                                        \
         case SnapshotType::HeapSnapshot:                                                                       \
-            m_heaps[HeapType##HeapIndex]->takeSnapshot(allocatorBaseName);                                     \
+            m_heaps[HeapType##HeapIndex]->takeSnapshot(allocatorBaseName, info);                               \
             break;                                                                                             \
         case SnapshotType::FreelistSnapshot:                                                                   \
             m_heaps[HeapType##HeapIndex]->takeFreelistSnapshot(allocatorBaseName);                             \
             break;                                                                                             \
         default:                                                                                               \
             ASSERT_NOT_REACHED();                                                                              \
         }                                                                                                      \
     }
 
     SNAPSHOT_HEAP(NormalPage1);
     SNAPSHOT_HEAP(NormalPage2);
     SNAPSHOT_HEAP(NormalPage3);
     SNAPSHOT_HEAP(NormalPage4);
     SNAPSHOT_HEAP(EagerSweep);
     SNAPSHOT_HEAP(Vector1);
     SNAPSHOT_HEAP(Vector2);
     SNAPSHOT_HEAP(Vector3);
     SNAPSHOT_HEAP(Vector4);
     SNAPSHOT_HEAP(InlineVector);
     SNAPSHOT_HEAP(HashTable);
     SNAPSHOT_HEAP(LargeObject);
     FOR_EACH_TYPED_HEAP(SNAPSHOT_HEAP);
 
     ASSERT(numberOfHeapsReported == NumberOfHeaps);
 
 #undef SNAPSHOT_HEAP
+
+    Vector<String> classNameVector(info.classTags.size());
+    for (GCSnapshotInfo::ClassTagMap::iterator it = info.classTags.begin(); it != info.classTags.end(); ++it)
+        classNameVector[it->value] = it->key->m_className;
+
+    for (size_t i = 0; i < classNameVector.size(); ++i) {
+        String dumpName = String::format("blink_gc/thread_%lu/classes/", (unsigned long)(m_thread)) + classNameVector[i];
+        WebMemoryAllocatorDump* classDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(dumpName);
+        classDump->AddScalar("live_count", "objects", info.liveCount[i]);
+        classDump->AddScalar("dead_count", "objects", info.deadCount[i]);
+        classDump->AddScalar("live_size", "bytes", info.liveSize[i]);
+        classDump->AddScalar("dead_size", "bytes", info.deadSize[i]);
+    }
 }
 
 #if ENABLE(GC_PROFILING)
 const GCInfo* ThreadState::findGCInfoFromAllThreads(Address address)
 {
     bool needLockForIteration = !ThreadState::current()->isInGC();
     if (needLockForIteration)
         threadAttachMutex().lock();
 
     for (ThreadState* state : attachedThreads()) {
@@ skipping 79 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink