Adding blink gc memory dump infrastructure for thread specific dumps.

Source/platform/heap/ThreadState.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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ThreadState_h
 #define ThreadState_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/AddressSanitizer.h"
 #include "platform/heap/ThreadingTraits.h"
+#include "public/platform/WebMemoryDumpProvider.h"
 #include "public/platform/WebThread.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/ThreadSpecific.h"
 #include "wtf/Threading.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/text/WTFString.h"
 
@@ skipping 110 matching lines @@
 const size_t numberOfGenerationsToTrack = 8;
 const size_t maxHeapObjectAge = numberOfGenerationsToTrack - 1;
 
 struct AgeCounts {
     int ages[numberOfGenerationsToTrack];
     AgeCounts() { std::fill(ages, ages + numberOfGenerationsToTrack, 0); }
 };
 typedef HashMap<String, AgeCounts> ClassAgeCountsMap;
 #endif
 
-class PLATFORM_EXPORT ThreadState {
+class PLATFORM_EXPORT ThreadState : public WebMemoryDumpProvider {
     WTF_MAKE_NONCOPYABLE(ThreadState);
 public:
     // When garbage collecting we need to know whether or not there
     // can be pointers to Blink GC managed objects on the stack for
     // each thread. When threads reach a safe point they record
     // whether or not they have pointers on the stack.
     enum StackState {
         NoHeapPointersOnStack,
         HeapPointersOnStack
     };
@@ skipping 272 matching lines @@
     // Visit local thread stack and trace all pointers conservatively.
     void visitStack(Visitor*);
 
     // Visit the asan fake stack frame corresponding to a slot on the
     // real machine stack if there is one.
     void visitAsanFakeStackForPointer(Visitor*, Address);
 
     // Visit all persistents allocated on this thread.
     void visitPersistents(Visitor*);
 
+    void dumpMemoryIfNecessary();

[petrcermak, 2015/05/21 13:15:57]

Maybe add one or two one-line comments explaining what the new methods do?

[ssid, 2015/05/21 16:55:28]

Done.

+    void dumpMemory();
+
 #if ENABLE(GC_PROFILING)
     const GCInfo* findGCInfo(Address);
     static const GCInfo* findGCInfoFromAllThreads(Address);
 
     struct SnapshotInfo {
         ThreadState* state;
 
         size_t freeSize;
         size_t pageCount;
 
@@ skipping 132 matching lines @@
         return m_heaps[heapIndex];
     }
     BaseHeap* expandedVectorBackingHeap(size_t gcInfoIndex);
     static bool isVectorHeapIndex(int heapIndex)
     {
         return Vector1HeapIndex <= heapIndex && heapIndex <= Vector4HeapIndex;
     }
     void allocationPointAdjusted(int heapIndex);
     void promptlyFreed(size_t gcInfoIndex);
 
+    // WebMemoryDumpProvider implementation.
+    bool onMemoryDump(WebProcessMemoryDump*) override;
+
 private:
     ThreadState();
     ~ThreadState();
 
     void enterSafePoint(StackState, void*);
     NO_SANITIZE_ADDRESS void copyStackUntilSafePointScope();
     void clearSafePointScopeMarker()
     {
         m_safePointStackCopy.clear();
         m_safePointScopeMarker = nullptr;
@@ skipping 77 matching lines @@
 
     v8::Isolate* m_isolate;
     void (*m_traceDOMWrappers)(v8::Isolate*, Visitor*);
 
 #if defined(ADDRESS_SANITIZER)
     void* m_asanFakeStack;
 #endif
 
     Vector<PageMemoryRegion*> m_allocatedRegionsSinceLastGC;
 
+    OwnPtr<WebProcessMemoryDump> m_lastProcessMemoryDump;
+
 #if ENABLE(GC_PROFILING)
     double m_nextFreeListSnapshotTime;
 #endif
     // Ideally we want to allocate an array of size |gcInfoTableMax| but it will
     // waste memory. Thus we limit the array size to 2^8 and share one entry
     // with multiple types of vectors. This won't be an issue in practice,
     // since there will be less than 2^8 types of objects in common cases.
     static const int likelyToBePromptlyFreedArraySize = (1 << 8);
     static const int likelyToBePromptlyFreedArrayMask = likelyToBePromptlyFreedArraySize - 1;
     OwnPtr<int[]> m_likelyToBePromptlyFreed;
@@ skipping 12 matching lines @@
 };
 
 template<> class ThreadStateFor<AnyThread> {
 public:
     static ThreadState* state() { return ThreadState::current(); }
 };
 
 } // namespace blink
 
 #endif // ThreadState_h