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// Copyright 2020 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_HANDLES_PERSISTENT_HANDLES_H_
#define V8_HANDLES_PERSISTENT_HANDLES_H_
#include <vector>
#include "include/v8-internal.h"
#include "src/api/api.h"
#include "src/base/macros.h"
#include "src/objects/visitors.h"
namespace v8 {
namespace internal {
class Heap;
// PersistentHandles serves as a container for handles that can be passed back
// and forth between threads. Allocation and deallocation of this class is
// thread-safe and the isolate tracks all PersistentHandles containers.
class PersistentHandles {
public:
V8_EXPORT_PRIVATE explicit PersistentHandles(
Isolate* isolate, size_t block_size = kHandleBlockSize);
V8_EXPORT_PRIVATE ~PersistentHandles();
PersistentHandles(const PersistentHandles&) = delete;
PersistentHandles& operator=(const PersistentHandles&) = delete;
void Iterate(RootVisitor* visitor);
V8_EXPORT_PRIVATE Handle<Object> NewHandle(Address value);
private:
void AddBlock();
Address* GetHandle(Address value);
#ifdef DEBUG
void Attach(LocalHeap* local_heap);
void Detach();
LocalHeap* owner_ = nullptr;
#else
void Attach(LocalHeap*) {}
void Detach() {}
#endif
Isolate* isolate_;
std::vector<Address*> blocks_;
size_t block_size_;
Address* block_next_;
Address* block_limit_;
PersistentHandles* prev_;
PersistentHandles* next_;
friend class PersistentHandlesList;
friend class LocalHeap;
};
class PersistentHandlesList {
public:
explicit PersistentHandlesList(Isolate* isolate)
: isolate_(isolate), persistent_handles_head_(nullptr) {}
// Iteration is only safe during a safepoint
void Iterate(RootVisitor* visitor);
private:
void Add(PersistentHandles* persistent_handles);
void Remove(PersistentHandles* persistent_handles);
Isolate* isolate_;
base::Mutex persistent_handles_mutex_;
PersistentHandles* persistent_handles_head_ = nullptr;
friend class PersistentHandles;
};
} // namespace internal
} // namespace v8
#endif // V8_HANDLES_PERSISTENT_HANDLES_H_
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