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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef MarkingVisitorImpl_h | |
| 6 #define MarkingVisitorImpl_h | |
| 7 | |
| 8 #include "platform/heap/Heap.h" | |
| 9 #include "platform/heap/ThreadState.h" | |
| 10 #include "platform/heap/Visitor.h" | |
| 11 #include "wtf/Allocator.h" | |
| 12 | |
| 13 namespace blink { | |
| 14 | |
| 15 template <typename Derived> | |
| 16 class MarkingVisitorImpl { | |
| 17 USING_FAST_MALLOC(MarkingVisitorImpl); | |
| 18 | |
| 19 protected: | |
| 20 inline void markHeader(HeapObjectHeader* header, | |
| 21 const void* objectPointer, | |
| 22 TraceCallback callback) { | |
| 23 ASSERT(header); | |
| 24 ASSERT(objectPointer); | |
| 25 | |
| 26 // If you hit this ASSERT, it means that there is a dangling pointer | |
| 27 // from a live thread heap to a dead thread heap. We must eliminate | |
| 28 // the dangling pointer. | |
| 29 // Release builds don't have the ASSERT, but it is OK because | |
| 30 // release builds will crash in the following header->isMarked() | |
| 31 // because all the entries of the orphaned arenas are zapped. | |
| 32 ASSERT(!pageFromObject(objectPointer)->orphaned()); | |
| 33 | |
| 34 if (header->isMarked()) | |
| 35 return; | |
| 36 | |
| 37 ASSERT(ThreadState::current()->isInGC()); | |
| 38 DCHECK(toDerived()->getMarkingMode() != VisitorMarkingMode::WeakProcessing); | |
| 39 | |
| 40 // A GC should only mark the objects that belong in its heap. | |
| 41 DCHECK(&pageFromObject(objectPointer)->arena()->getThreadState()->heap() == | |
| 42 &toDerived()->heap()); | |
| 43 | |
| 44 header->mark(); | |
| 45 | |
| 46 if (callback) | |
| 47 toDerived()->heap().pushTraceCallback(const_cast<void*>(objectPointer), | |
| 48 callback); | |
| 49 } | |
| 50 | |
| 51 inline void mark(const void* objectPointer, TraceCallback callback) { | |
| 52 if (!objectPointer) | |
| 53 return; | |
| 54 HeapObjectHeader* header = HeapObjectHeader::fromPayload(objectPointer); | |
| 55 markHeader(header, header->payload(), callback); | |
| 56 } | |
| 57 | |
| 58 inline void registerDelayedMarkNoTracing(const void* objectPointer) { | |
| 59 DCHECK(toDerived()->getMarkingMode() != VisitorMarkingMode::WeakProcessing); | |
| 60 toDerived()->heap().pushPostMarkingCallback( | |
| 61 const_cast<void*>(objectPointer), &markNoTracingCallback); | |
| 62 } | |
| 63 | |
| 64 inline void registerWeakMembers(const void* closure, | |
| 65 const void* objectPointer, | |
| 66 WeakCallback callback) { | |
| 67 DCHECK(toDerived()->getMarkingMode() != VisitorMarkingMode::WeakProcessing); | |
| 68 // We don't want to run weak processings when taking a snapshot. | |
| 69 if (toDerived()->getMarkingMode() == VisitorMarkingMode::SnapshotMarking) | |
| 70 return; | |
| 71 toDerived()->heap().pushThreadLocalWeakCallback( | |
| 72 const_cast<void*>(closure), const_cast<void*>(objectPointer), callback); | |
| 73 } | |
| 74 | |
| 75 inline void registerWeakTable(const void* closure, | |
| 76 EphemeronCallback iterationCallback, | |
| 77 EphemeronCallback iterationDoneCallback) { | |
| 78 DCHECK(toDerived()->getMarkingMode() != VisitorMarkingMode::WeakProcessing); | |
| 79 toDerived()->heap().registerWeakTable( | |
| 80 const_cast<void*>(closure), iterationCallback, iterationDoneCallback); | |
| 81 } | |
| 82 | |
| 83 #if DCHECK_IS_ON() | |
| 84 inline bool weakTableRegistered(const void* closure) { | |
| 85 return toDerived()->heap().weakTableRegistered(closure); | |
| 86 } | |
| 87 #endif | |
| 88 | |
| 89 inline bool ensureMarked(const void* objectPointer) { | |
| 90 if (!objectPointer) | |
| 91 return false; | |
| 92 | |
| 93 HeapObjectHeader* header = HeapObjectHeader::fromPayload(objectPointer); | |
| 94 if (header->isMarked()) | |
| 95 return false; | |
| 96 #if DCHECK_IS_ON() | |
| 97 toDerived()->markNoTracing(objectPointer); | |
| 98 #else | |
| 99 // Inline what the above markNoTracing() call expands to, | |
| 100 // so as to make sure that we do get all the benefits (asserts excepted.) | |
| 101 header->mark(); | |
| 102 #endif | |
| 103 return true; | |
| 104 } | |
| 105 | |
| 106 inline void registerWeakCellWithCallback(void** cell, WeakCallback callback) { | |
| 107 DCHECK(toDerived()->getMarkingMode() != VisitorMarkingMode::WeakProcessing); | |
| 108 // We don't want to run weak processings when taking a snapshot. | |
| 109 if (toDerived()->getMarkingMode() == VisitorMarkingMode::SnapshotMarking) | |
| 110 return; | |
| 111 toDerived()->heap().pushGlobalWeakCallback(cell, callback); | |
| 112 } | |
| 113 | |
| 114 Derived* toDerived() { return static_cast<Derived*>(this); } | |
| 115 | |
| 116 private: | |
| 117 static void markNoTracingCallback(Visitor* visitor, void* object) { | |
| 118 visitor->markNoTracing(object); | |
| 119 } | |
| 120 }; | |
| 121 | |
| 122 } // namespace blink | |
| 123 | |
| 124 #endif | |
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Chromium Code Reviews
Issue 2652923002:
Devirtualize Visitor and remove inline visitor specialization. (Closed)
