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// Copyright 2019 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_READ_ONLY_HEAP_H_
#define V8_HEAP_READ_ONLY_HEAP_H_
#include "src/base/macros.h"
#include "src/heap/heap.h"
#include "src/roots.h"
#include "src/snapshot/read-only-deserializer.h"
namespace v8 {
namespace internal {
class ReadOnlySpace;
// This class transparently manages read-only space, roots and cache creation
// and destruction. Eventually this will allow sharing these artifacts between
// isolates.
class ReadOnlyHeap {
public:
static ReadOnlyHeap* GetOrCreateReadOnlyHeap(Heap* heap);
// If necessary, deserialize read-only objects and set up read-only object
// cache.
void MaybeDeserialize(Isolate* isolate, ReadOnlyDeserializer* des);
// Frees ReadOnlySpace and itself when sharing is disabled. No-op otherwise.
// Read-only data should not be used within the current isolate after this is
// called.
void OnHeapTearDown();
std::vector<Object>* read_only_object_cache() {
return &read_only_object_cache_;
}
ReadOnlySpace* read_only_space() const { return read_only_space_; }
private:
ReadOnlySpace* read_only_space_ = nullptr;
std::vector<Object> read_only_object_cache_;
explicit ReadOnlyHeap(ReadOnlySpace* ro_space) : read_only_space_(ro_space) {}
DISALLOW_COPY_AND_ASSIGN(ReadOnlyHeap);
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_READ_ONLY_HEAP_H_
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