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// Copyright 2017 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_INVALIDATED_SLOTS_H_
#define V8_HEAP_INVALIDATED_SLOTS_H_
#include <map>
#include <stack>
#include "src/allocation.h"
#include "src/base/atomic-utils.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
class HeapObject;
// This data structure stores objects that went through object layout change
// that potentially invalidates slots recorded concurrently. The second part
// of each element is the size of the corresponding object before the layout
// change.
using InvalidatedSlots = std::map<HeapObject*, int>;
// This class provides IsValid predicate that takes into account the set
// of invalidated objects in the given memory chunk.
// The sequence of queried slot must be non-decreasing. This allows fast
// implementation with complexity O(m*log(m) + n), where
// m is the number of invalidated objects in the memory chunk.
// n is the number of IsValid queries.
class InvalidatedSlotsFilter {
public:
explicit InvalidatedSlotsFilter(MemoryChunk* chunk);
inline bool IsValid(Address slot);
private:
InvalidatedSlots::const_iterator iterator_;
InvalidatedSlots::const_iterator iterator_end_;
Address sentinel_;
Address invalidated_start_;
Address invalidated_end_;
HeapObject* invalidated_object_;
int invalidated_object_size_;
InvalidatedSlots empty_;
#ifdef DEBUG
Address last_slot_;
#endif
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_INVALIDATED_SLOTS_H_
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