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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 <set>
#include <stack>
#include "src/base/atomic-utils.h"
#include "src/objects/heap-object.h"
#include "src/utils/allocation.h"
#include "src/utils/utils.h"
namespace v8 {
namespace internal {
// 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::set<HeapObject, Object::Comparer>;
// 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 V8_EXPORT_PRIVATE InvalidatedSlotsFilter {
public:
static InvalidatedSlotsFilter OldToOld(MemoryChunk* chunk);
static InvalidatedSlotsFilter OldToNew(MemoryChunk* chunk);
explicit InvalidatedSlotsFilter(MemoryChunk* chunk,
InvalidatedSlots* invalidated_slots);
inline bool IsValid(Address slot);
private:
InvalidatedSlots::const_iterator iterator_;
InvalidatedSlots::const_iterator iterator_end_;
Address sentinel_;
Address invalidated_start_;
Address next_invalidated_start_;
int invalidated_size_;
InvalidatedSlots empty_;
#ifdef DEBUG
Address last_slot_;
#endif
private:
inline void NextInvalidatedObject();
};
class V8_EXPORT_PRIVATE InvalidatedSlotsCleanup {
public:
static InvalidatedSlotsCleanup OldToNew(MemoryChunk* chunk);
static InvalidatedSlotsCleanup NoCleanup(MemoryChunk* chunk);
explicit InvalidatedSlotsCleanup(MemoryChunk* chunk,
InvalidatedSlots* invalidated_slots);
inline void Free(Address free_start, Address free_end);
private:
InvalidatedSlots::iterator iterator_;
InvalidatedSlots::iterator iterator_end_;
InvalidatedSlots* invalidated_slots_;
InvalidatedSlots empty_;
Address sentinel_;
Address invalidated_start_;
inline void NextInvalidatedObject();
#ifdef DEBUG
Address last_free_;
#endif
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_INVALIDATED_SLOTS_H_
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