Add files

v8/include/cppgc/process-heap-statistics.h

@@ -0,0 +1,36 @@
+// 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 INCLUDE_CPPGC_PROCESS_HEAP_STATISTICS_H_
+#define INCLUDE_CPPGC_PROCESS_HEAP_STATISTICS_H_
+
+#include <atomic>
+#include <cstddef>
+
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+class ProcessHeapStatisticsUpdater;
+}  // namespace internal
+
+class V8_EXPORT ProcessHeapStatistics final {
+ public:
+  static size_t TotalAllocatedObjectSize() {
+    return total_allocated_object_size_.load(std::memory_order_relaxed);
+  }
+  static size_t TotalAllocatedSpace() {
+    return total_allocated_space_.load(std::memory_order_relaxed);
+  }
+
+ private:
+  static std::atomic_size_t total_allocated_space_;
+  static std::atomic_size_t total_allocated_object_size_;
+
+  friend class internal::ProcessHeapStatisticsUpdater;
+};
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_PROCESS_HEAP_STATISTICS_H_