Adding blink gc memory dump infrastructure for thread specific 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 860 matching lines @@
         bool disabledByDefaultGCTracingEnabled;
         TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("blink_gc"), &disabledByDefaultGCTracingEnabled);
 
         snapshot();
         if (disabledByDefaultGCTracingEnabled)
             collectAndReportMarkSweepStats();
         incrementMarkedObjectsAge();
     }
 #endif
 
+    if (gcType == TakeSnapshot)
+        takeSnapshot();
+
     for (int i = 0; i < NumberOfHeaps; i++)
         m_heaps[i]->prepareForSweep();
 
     if (gcType == GCWithSweep) {
         setGCState(EagerSweepScheduled);
     } else if (gcType == GCWithoutSweep) {
         setGCState(LazySweepScheduled);
     } else {
-        takeSnapshot();
         // This unmarks all marked objects and marks all unmarked objects dead.
         makeConsistentForSweeping(gcType);
         // Force setting NoGCScheduled to circumvent checkThread()
         // in setGCState().
         m_gcState = NoGCScheduled;
     }
 }
 
 void ThreadState::preSweep()
 {
@@ skipping 373 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()
 {
     ASSERT(isInGC());
-    // TODO(ssid): Implement this.
+
+#define SNAPSHOT_HEAP(HeapType)                                                                   \
+    {                                                                                             \
+        String allocatorBaseName;                                                                 \
+        if (isMainThread()) {                                                                     \
+            allocatorBaseName = String("blink_gc/thread_main/heaps/" #HeapType);                  \
+        }                                                                                         \
+        else {                                                                                    \
+            allocatorBaseName = String::format("blink_gc/thread_%ld/heaps/" #HeapType, m_thread); \
+        }                                                                                         \
+        m_heaps[HeapType##HeapIndex]->takeSnapshot(allocatorBaseName);                            \
+    }
+
+    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);
+
+#undef SNAPSHOT_HEAP
 }
 
 #if ENABLE(GC_PROFILING)
 const GCInfo* ThreadState::findGCInfoFromAllThreads(Address address)
 {
     bool needLockForIteration = !ThreadState::current()->isInGC();
     if (needLockForIteration)
         threadAttachMutex().lock();
 
     for (ThreadState* state : attachedThreads()) {
@@ skipping 72 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