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// Copyright 2018 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_HEAP_HEAP_WRITE_BARRIER_H_ #define V8_HEAP_HEAP_WRITE_BARRIER_H_ #include "include/v8-internal.h" #include "src/base/optional.h" #include "src/common/globals.h" #include "src/objects/heap-object.h" namespace v8 { namespace internal { class ArrayBufferExtension; class InstructionStream; class DescriptorArray; class EphemeronHashTable; class FixedArray; class Heap; class JSArrayBuffer; class Map; class MarkCompactCollector; class MarkingBarrier; class RelocInfo; // Note: In general it is preferred to use the macros defined in // object-macros.h. // Combined write barriers. void WriteBarrierForCode(Tagged<InstructionStream> host, RelocInfo* rinfo, Tagged<Object> value, WriteBarrierMode mode = UPDATE_WRITE_BARRIER); void WriteBarrierForCode(Tagged<InstructionStream> host, RelocInfo* rinfo, Tagged<HeapObject> value, WriteBarrierMode mode = UPDATE_WRITE_BARRIER); void CombinedWriteBarrier(Tagged<HeapObject> object, ObjectSlot slot, Tagged<Object> value, WriteBarrierMode mode); void CombinedWriteBarrier(Tagged<HeapObject> object, MaybeObjectSlot slot, MaybeObject value, WriteBarrierMode mode); void CombinedEphemeronWriteBarrier(Tagged<EphemeronHashTable> object, ObjectSlot slot, Tagged<Object> value, WriteBarrierMode mode); void IndirectPointerWriteBarrier(Tagged<HeapObject> host, IndirectPointerSlot slot, Tagged<HeapObject> value, WriteBarrierMode mode); // Generational write barrier. void GenerationalBarrierForCode(Tagged<InstructionStream> host, RelocInfo* rinfo, Tagged<HeapObject> object); inline bool IsReadOnlyHeapObject(Tagged<HeapObject> object); class V8_EXPORT_PRIVATE WriteBarrier { public: static inline void Marking(Tagged<HeapObject> host, ObjectSlot, Tagged<Object> value); static inline void Marking(Tagged<HeapObject> host, HeapObjectSlot, Tagged<HeapObject> value); static inline void Marking(Tagged<HeapObject> host, MaybeObjectSlot, MaybeObject value); static inline void Marking(Tagged<InstructionStream> host, RelocInfo*, Tagged<HeapObject> value); static inline void Marking(Tagged<JSArrayBuffer> host, ArrayBufferExtension*); static inline void Marking(Tagged<DescriptorArray>, int number_of_own_descriptors); static inline void Marking(Tagged<HeapObject> host, IndirectPointerSlot slot); static inline void Shared(Tagged<InstructionStream> host, RelocInfo*, Tagged<HeapObject> value); // It is invoked from generated code and has to take raw addresses. static int MarkingFromCode(Address raw_host, Address raw_slot); static int IndirectPointerMarkingFromCode(Address raw_host, Address raw_slot, Address raw_tag); static int SharedMarkingFromCode(Address raw_host, Address raw_slot); static int SharedFromCode(Address raw_host, Address raw_slot); // Invoked from global handles where no host object is available. static inline void MarkingFromGlobalHandle(Tagged<Object> value); static inline void CombinedBarrierFromInternalFields(Tagged<JSObject> host, void* value); static inline void CombinedBarrierFromInternalFields(Tagged<JSObject> host, size_t argc, void** values); static MarkingBarrier* SetForThread(MarkingBarrier*); static MarkingBarrier* CurrentMarkingBarrier( Tagged<HeapObject> verification_candidate); #ifdef ENABLE_SLOW_DCHECKS template <typename T> static inline bool IsRequired(Tagged<HeapObject> host, T value); static bool IsImmortalImmovableHeapObject(Tagged<HeapObject> object); #endif static void MarkingSlow(Tagged<HeapObject> host, HeapObjectSlot, Tagged<HeapObject> value); private: static inline bool IsMarking(Tagged<HeapObject> object); static void MarkingSlow(Tagged<InstructionStream> host, RelocInfo*, Tagged<HeapObject> value); static void MarkingSlow(Tagged<JSArrayBuffer> host, ArrayBufferExtension*); static void MarkingSlow(Tagged<DescriptorArray>, int number_of_own_descriptors); static void MarkingSlow(Tagged<HeapObject> host, IndirectPointerSlot slot); static void MarkingSlowFromGlobalHandle(Tagged<HeapObject> value); static void MarkingSlowFromInternalFields(Heap* heap, Tagged<JSObject> host); static inline void GenerationalBarrierFromInternalFields( Tagged<JSObject> host, void* value); static inline void GenerationalBarrierFromInternalFields( Tagged<JSObject> host, size_t argc, void** values); static void SharedSlow(Tagged<InstructionStream> host, RelocInfo*, Tagged<HeapObject> value); friend class Heap; }; } // namespace internal } // namespace v8 #endif // V8_HEAP_HEAP_WRITE_BARRIER_H_