1 files changed, 50 insertions, 0 deletions
diff --git a/chromium/v8/src/logging/tracing-flags.h b/chromium/v8/src/logging/tracing-flags.h
new file mode 100644
index 00000000000..b23ed03a20a
--- /dev/null
+++ b/chromium/v8/src/logging/tracing-flags.h
@@ -0,0 +1,50 @@
+// 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_LOGGING_TRACING_FLAGS_H_
+#define V8_LOGGING_TRACING_FLAGS_H_
+
+#include <atomic>
+
+#include "src/base/macros.h"
+
+namespace v8 {
+namespace internal {
+
+// This struct contains a set of flags that can be modified from multiple
+// threads at runtime unlike the normal FLAG_-like flags which are not modified
+// after V8 instance is initialized.
+
+struct TracingFlags {
+  static V8_EXPORT_PRIVATE std::atomic_uint runtime_stats;
+  static V8_EXPORT_PRIVATE std::atomic_uint gc;
+  static V8_EXPORT_PRIVATE std::atomic_uint gc_stats;
+  static V8_EXPORT_PRIVATE std::atomic_uint ic_stats;
+  static V8_EXPORT_PRIVATE std::atomic_uint zone_stats;
+
+  static bool is_runtime_stats_enabled() {
+    return runtime_stats.load(std::memory_order_relaxed) != 0;
+  }
+
+  static bool is_gc_enabled() {
+    return gc.load(std::memory_order_relaxed) != 0;
+  }
+
+  static bool is_gc_stats_enabled() {
+    return gc_stats.load(std::memory_order_relaxed) != 0;
+  }
+
+  static bool is_ic_stats_enabled() {
+    return ic_stats.load(std::memory_order_relaxed) != 0;
+  }
+
+  static bool is_zone_stats_enabled() {
+    return zone_stats.load(std::memory_order_relaxed) != 0;
+  }
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_LOGGING_TRACING_FLAGS_H_