detailed stracktrace only when option -d, second implemented in c++

ml_profiler.h

@@ -12,37 +12,40 @@
 static const int method_name_print_len = 15;
 static const int print_top_methods = 15;
 static const int call_stack_max_methods = 10;
+static const int call_stack_args_str_len = 64;
 
 class MlPerfMon {
 
 private:
-    MlPerfMon() : perfOn(false) {
+    MlPerfMon() : perfOn(false), debugStacktraceOn(false) {
         main_thread_id = std::this_thread::get_id();
     };
 
 public:
 
     // https://stackoverflow.com/questions/43523509/simple-singleton-example-in-c
-    static MlPerfMon& instance(){
+    static MlPerfMon& instance() {
         static MlPerfMon instance;
         return instance;
     }
 
     void turnOn();
+    void debugOn();
 
     void add_method_call(const MlValue &function, const std::vector<MlValue> &args);
     void end_method_call();
 
     std::string callstack() const;
 
-    size_t get_callstack_position();
+    size_t get_callstack_position() const;
     void restore_callstack_position(size_t to_position);
     void clear_callstack();
     
-    void print_results();
+    void print_results() const;
 
 private:
     bool perfOn;
+    bool debugStacktraceOn;
     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;