1 files changed, 19 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/function-trace.cc b/third_party/nix/src/libexpr/function-trace.cc
new file mode 100644
index 000000000000..b1b856965c2a
--- /dev/null
+++ b/third_party/nix/src/libexpr/function-trace.cc
@@ -0,0 +1,19 @@
+#include "libexpr/function-trace.hh"
+
+#include <glog/logging.h>
+
+namespace nix {
+
+FunctionCallTrace::FunctionCallTrace(const Pos& pos) : pos(pos) {
+  auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
+  auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
+  LOG(INFO) << "function-trace entered " << pos << " at " << ns.count();
+}
+
+FunctionCallTrace::~FunctionCallTrace() {
+  auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
+  auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
+  LOG(INFO) << "function-trace exited " << pos << " at " << ns.count();
+}
+
+}  // namespace nix