Adding blink gc memory dump infrastructure for thread specific dumps.

Source/platform/heap/Heap.h

 /*
  * 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 77 matching lines @@
 #else
 #define FILL_ZERO_IF_PRODUCTION(address, size) memset((address), 0, (size))
 #define FILL_ZERO_IF_NOT_PRODUCTION(address, size) do { } while (false)
 #endif
 
 class CallbackStack;
 class FreePagePool;
 class NormalPageHeap;
 class OrphanedPagePool;
 class PageMemory;
+class WebProcessMemoryDump;
 
 #if ENABLE(GC_PROFILING)
 class TracedValue;
 #endif
 
 // HeapObjectHeader is 4 byte (32 bit) that has the following layout:
 //
 // | gcInfoIndex (14 bit) | DOM mark bit (1 bit) | size (14 bit) | dead bit (1 bit) | freed bit (1 bit) | mark bit (1 bit) |
 //
 // - For non-large objects, 14 bit is enough for |size| because the blink
@@ skipping 571 matching lines @@
 //
 // BaseHeap is a parent class of NormalPageHeap and LargeObjectHeap.
 // NormalPageHeap represents a heap that contains NormalPages
 // and LargeObjectHeap represents a heap that contains LargeObjectPages.
 class PLATFORM_EXPORT BaseHeap {
 public:
     BaseHeap(ThreadState*, int);
     virtual ~BaseHeap();
     void cleanupPages();
 
+    void dumpMemory(const String& allocatorBaseName);
 #if ENABLE(ASSERT) || ENABLE(GC_PROFILING)
     BasePage* findPageFromAddress(Address);
 #endif
 #if ENABLE(GC_PROFILING)
     void snapshot(TracedValue*, ThreadState::SnapshotInfo*);
     virtual void snapshotFreeList(TracedValue&) { };
 
     void countMarkedObjects(ClassAgeCountsMap&) const;
     void countObjectsToSweep(ClassAgeCountsMap&) const;
     void incrementMarkedObjectsAge();
@@ skipping 289 matching lines @@
     static void increaseAllocatedSpace(size_t delta) { atomicAdd(&s_allocatedSpace, static_cast<long>(delta)); }
     static void decreaseAllocatedSpace(size_t delta) { atomicSubtract(&s_allocatedSpace, static_cast<long>(delta)); }
     static size_t allocatedSpace() { return acquireLoad(&s_allocatedSpace); }
     static size_t estimatedLiveObjectSize() { return acquireLoad(&s_estimatedLiveObjectSize); }
     static void setEstimatedLiveObjectSize(size_t size) { releaseStore(&s_estimatedLiveObjectSize, size); }
     static size_t externalObjectSizeAtLastGC() { return acquireLoad(&s_externalObjectSizeAtLastGC); }
 
     static double estimatedMarkingTime();
     static void reportMemoryUsageHistogram();
 
+    static WebProcessMemoryDump* getLastProcessMemoryDump();

[Primiano Tucci (use gerrit), 2015/05/22 15:50:21]

Hmm I think it would be cleaner if we keep the extra WPMD in the
BlinkGCMemoryDumpProvider, so this file stays cleaner.
In essence you should have
BlinkGCMemoryDumpProvider::getProcessMemoryDumpForLastGC() (no need to make it
static, BlinkGCMemoryDumpProvider is already singleton), and remove these two
lines here.

[ssid, 2015/05/22 17:17:10]

Done.

+    static void clearLastProcessMemoryDump();
+
 private:
     // A RegionTree is a simple binary search tree of PageMemoryRegions sorted
     // by base addresses.
     class RegionTree {
     public:
         explicit RegionTree(PageMemoryRegion* region) : m_region(region), m_left(nullptr), m_right(nullptr) { }
         ~RegionTree()
         {
             delete m_left;
             delete m_right;
@@ skipping 20 matching lines @@
     static bool s_lastGCWasConservative;
     static FreePagePool* s_freePagePool;
     static OrphanedPagePool* s_orphanedPagePool;
     static RegionTree* s_regionTree;
     static size_t s_allocatedSpace;
     static size_t s_allocatedObjectSize;
     static size_t s_markedObjectSize;
     static size_t s_estimatedLiveObjectSize;
     static size_t s_externalObjectSizeAtLastGC;
     static double s_estimatedMarkingTimePerByte;
+    static WebProcessMemoryDump* s_lastProcessMemoryDump;

[Primiano Tucci (use gerrit), 2015/05/22 15:50:21]

Same here, if you move the WPMD to the GCDumpprovider, this goes away

[ssid, 2015/05/22 17:17:10]

Done.

 
     friend class ThreadState;
 };
 
 template<typename T> class GarbageCollected {
     WTF_MAKE_NONCOPYABLE(GarbageCollected);
 
     // For now direct allocation of arrays on the heap is not allowed.
     void* operator new[](size_t size);
 
@@ skipping 225 matching lines @@
     size_t copySize = previousHeader->payloadSize();
     if (copySize > size)
         copySize = size;
     memcpy(address, previous, copySize);
     return address;
 }
 
 } // namespace blink
 
 #endif // Heap_h