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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_LIBPLATFORM_TRACING_PERFETTO_SHARED_MEMORY_H_
#define V8_LIBPLATFORM_TRACING_PERFETTO_SHARED_MEMORY_H_
#include "perfetto/tracing/core/shared_memory.h"
#include "third_party/perfetto/include/perfetto/base/paged_memory.h"
namespace v8 {
namespace platform {
namespace tracing {
// Perfetto requires a shared memory implementation for multi-process embedders
// but V8 is single process. We implement it here using PagedMemory from
// perfetto.
class PerfettoSharedMemory : public ::perfetto::SharedMemory {
public:
explicit PerfettoSharedMemory(size_t size);
// The PagedMemory destructor will free the underlying memory when this object
// is destroyed.
void* start() const override { return paged_memory_.Get(); }
size_t size() const override { return size_; }
private:
size_t size_;
::perfetto::base::PagedMemory paged_memory_;
};
class PerfettoSharedMemoryFactory : public ::perfetto::SharedMemory::Factory {
public:
~PerfettoSharedMemoryFactory() override = default;
std::unique_ptr<::perfetto::SharedMemory> CreateSharedMemory(
size_t size) override;
};
} // namespace tracing
} // namespace platform
} // namespace v8
#endif // V8_LIBPLATFORM_TRACING_PERFETTO_SHARED_MEMORY_H_
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