1 files changed, 58 insertions, 0 deletions
diff --git a/deps/v8/src/torque/ls/globals.h b/deps/v8/src/torque/ls/globals.h
new file mode 100644
index 0000000000..df6589c146
--- /dev/null
+++ b/deps/v8/src/torque/ls/globals.h
@@ -0,0 +1,58 @@
+// 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_TORQUE_LS_GLOBALS_H_
+#define V8_TORQUE_LS_GLOBALS_H_
+
+#include <fstream>
+#include "src/torque/contextual.h"
+
+namespace v8 {
+namespace internal {
+namespace torque {
+
+// When the language server is run by VS code, stdout can not be seen, as it is
+// used as the communication channel. For debugging purposes a simple
+// Log class is added, that allows writing diagnostics to a file configurable
+// via command line flag.
+class Logger : public ContextualClass<Logger> {
+ public:
+  Logger() : enabled_(false) {}
+  ~Logger() {
+    if (enabled_) logfile_.close();
+  }
+
+  static void Enable(std::string path) {
+    Get().enabled_ = true;
+    Get().logfile_.open(path);
+  }
+
+  template <class... Args>
+  static void Log(Args&&... args) {
+    if (Enabled()) {
+      USE((Stream() << std::forward<Args>(args))...);
+      Flush();
+    }
+  }
+
+ private:
+  static bool Enabled() { return Get().enabled_; }
+  static std::ofstream& Stream() {
+    CHECK(Get().enabled_);
+    return Get().logfile_;
+  }
+  static void Flush() { Get().logfile_.flush(); }
+
+ private:
+  bool enabled_;
+  std::ofstream logfile_;
+};
+
+DECLARE_CONTEXTUAL_VARIABLE(TorqueFileList, std::vector<std::string>);
+
+}  // namespace torque
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TORQUE_LS_GLOBALS_H_