1 files changed, 45 insertions, 0 deletions
diff --git a/deps/v8/src/libplatform/tracing/perfetto-shared-memory.h b/deps/v8/src/libplatform/tracing/perfetto-shared-memory.h
new file mode 100644
index 0000000000..7a987cc7f0
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+++ b/deps/v8/src/libplatform/tracing/perfetto-shared-memory.h
@@ -0,0 +1,45 @@
+// 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_