callstack added

ml_profiler.h

@@ -3,10 +3,12 @@
 #include "ml.h"
 
 #include <unordered_map>
+#include <deque>
 #include <chrono>
 
 static const int method_name_print_len = 15;
 static const int print_top_methods = 15;
+static const int call_stack_max_methods = 10;
 
 class MlPerfMon {
 
@@ -24,10 +26,13 @@ public:
     void turnOn();
 
     void add_method_call(const std::string &method);
+    void end_method_call();
+    std::string callstack() const;
     void print_results();
 
 private:
     bool perfOn;
     std::unordered_map<std::string, long> calls_counter;
     std::chrono::time_point<std::chrono::high_resolution_clock> start_time;
+    std::deque<std::string> call_stack;
 };