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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 */ | 29 */ |
30 | 30 |
31 #ifndef Visitor_h | 31 #ifndef Visitor_h |
32 #define Visitor_h | 32 #define Visitor_h |
33 | 33 |
34 #include "platform/PlatformExport.h" | 34 #include "platform/PlatformExport.h" |
| 35 #include "platform/heap/StackFrameDepth.h" |
35 #include "platform/heap/ThreadState.h" | 36 #include "platform/heap/ThreadState.h" |
36 #include "wtf/Assertions.h" | 37 #include "wtf/Assertions.h" |
37 #include "wtf/Deque.h" | 38 #include "wtf/Deque.h" |
38 #include "wtf/Forward.h" | 39 #include "wtf/Forward.h" |
39 #include "wtf/HashMap.h" | 40 #include "wtf/HashMap.h" |
40 #include "wtf/HashTraits.h" | 41 #include "wtf/HashTraits.h" |
41 #include "wtf/InstanceCounter.h" | 42 #include "wtf/InstanceCounter.h" |
42 #include "wtf/OwnPtr.h" | 43 #include "wtf/OwnPtr.h" |
43 #include "wtf/RefPtr.h" | 44 #include "wtf/RefPtr.h" |
44 #include "wtf/TypeTraits.h" | 45 #include "wtf/TypeTraits.h" |
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607 virtual bool ensureMarked(const void*) = 0; | 608 virtual bool ensureMarked(const void*) = 0; |
608 | 609 |
609 #if ENABLE(GC_PROFILE_MARKING) | 610 #if ENABLE(GC_PROFILE_MARKING) |
610 void setHostInfo(void* object, const String& name) | 611 void setHostInfo(void* object, const String& name) |
611 { | 612 { |
612 m_hostObject = object; | 613 m_hostObject = object; |
613 m_hostName = name; | 614 m_hostName = name; |
614 } | 615 } |
615 #endif | 616 #endif |
616 | 617 |
617 inline bool canTraceEagerly() const { return m_traceDepth < kMaxEagerTraceDe
pth; } | 618 inline bool canTraceEagerly() const |
618 inline void incrementTraceDepth() { m_traceDepth++; } | 619 { |
619 inline void decrementTraceDepth() { ASSERT(m_traceDepth > 0); m_traceDepth--
; } | 620 ASSERT(m_traceDepth); |
| 621 return m_traceDepth->isSafeToRecurse(); |
| 622 } |
| 623 |
| 624 inline void incrementTraceDepth() |
| 625 { |
| 626 ASSERT(m_traceDepth); |
| 627 m_traceDepth->increment(); |
| 628 } |
| 629 |
| 630 inline void decrementTraceDepth() |
| 631 { |
| 632 ASSERT(m_traceDepth); |
| 633 m_traceDepth->decrement(); |
| 634 } |
| 635 |
| 636 inline void configureEagerTraceLimit() |
| 637 { |
| 638 if (!m_traceDepth) |
| 639 m_traceDepth = new StackFrameDepth; |
| 640 m_traceDepth->configureLimit(); |
| 641 } |
620 | 642 |
621 inline bool isGlobalMarkingVisitor() const { return m_isGlobalMarkingVisitor
; } | 643 inline bool isGlobalMarkingVisitor() const { return m_isGlobalMarkingVisitor
; } |
622 | 644 |
623 protected: | 645 protected: |
624 explicit Visitor(VisitorType type) | 646 explicit Visitor(VisitorType type) |
625 : m_isGlobalMarkingVisitor(type == GlobalMarkingVisitorType) | 647 : m_isGlobalMarkingVisitor(type == GlobalMarkingVisitorType) |
626 { | 648 { } |
627 m_traceDepth = 0; | |
628 } | |
629 | 649 |
630 virtual void registerWeakCellWithCallback(void**, WeakPointerCallback) = 0; | 650 virtual void registerWeakCellWithCallback(void**, WeakPointerCallback) = 0; |
631 #if ENABLE(GC_PROFILE_MARKING) | 651 #if ENABLE(GC_PROFILE_MARKING) |
632 virtual void recordObjectGraphEdge(const void*) | 652 virtual void recordObjectGraphEdge(const void*) |
633 { | 653 { |
634 ASSERT_NOT_REACHED(); | 654 ASSERT_NOT_REACHED(); |
635 } | 655 } |
636 | 656 |
637 void* m_hostObject; | 657 void* m_hostObject; |
638 String m_hostName; | 658 String m_hostName; |
639 #endif | 659 #endif |
640 | 660 |
641 private: | 661 private: |
642 // The maximum depth of eager, unrolled trace() calls that is | 662 static StackFrameDepth* m_traceDepth; |
643 // considered safe and allowed. | |
644 const int kMaxEagerTraceDepth = 100; | |
645 | |
646 static int m_traceDepth; | |
647 bool m_isGlobalMarkingVisitor; | 663 bool m_isGlobalMarkingVisitor; |
648 }; | 664 }; |
649 | 665 |
650 // We trace vectors by using the trace trait on each element, which means you | 666 // We trace vectors by using the trace trait on each element, which means you |
651 // can have vectors of general objects (not just pointers to objects) that can | 667 // can have vectors of general objects (not just pointers to objects) that can |
652 // be traced. | 668 // be traced. |
653 template<typename T, size_t N> | 669 template<typename T, size_t N> |
654 struct OffHeapCollectionTraceTrait<WTF::Vector<T, N, WTF::DefaultAllocator> > { | 670 struct OffHeapCollectionTraceTrait<WTF::Vector<T, N, WTF::DefaultAllocator> > { |
655 typedef WTF::Vector<T, N, WTF::DefaultAllocator> Vector; | 671 typedef WTF::Vector<T, N, WTF::DefaultAllocator> Vector; |
656 | 672 |
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890 struct GCInfoTrait { | 906 struct GCInfoTrait { |
891 static size_t index() | 907 static size_t index() |
892 { | 908 { |
893 return GCInfoAtBase<typename GetGarbageCollectedBase<T>::type>::index(); | 909 return GCInfoAtBase<typename GetGarbageCollectedBase<T>::type>::index(); |
894 } | 910 } |
895 }; | 911 }; |
896 | 912 |
897 } | 913 } |
898 | 914 |
899 #endif | 915 #endif |
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