text: /* Copyright (C) 2005-2019 Shugo Maeda <shugo@ruby-lang.org> and Charlie Savage <cfis@savagexi.com>
     Please see the LICENSE file for copyright and distribution information */
  
  #ifndef __RP_STACK__
  #define __RP_STACK__
  
  #include "ruby_prof.h"
  #include "rp_call_tree.h"
  
     /* Temporary object that maintains profiling information
        for active methods.  They are created and destroyed
        as the program moves up and down its stack. */
  typedef struct prof_frame_t
  {
      /* Caching prof_method_t values significantly
         increases performance. */
      prof_call_tree_t* call_tree;
  
      VALUE source_file;
      unsigned int source_line;
  
      double start_time;
      double switch_time;  /* Time at switch to different thread */
      double wait_time;
      double child_time;
      double pause_time; // Time pause() was initiated
      double dead_time; // Time to ignore (i.e. total amount of time between pause/resume blocks)
  } prof_frame_t;
  
  #define prof_frame_is_paused(f) (f->pause_time >= 0)
  #define prof_frame_is_unpaused(f) (f->pause_time < 0)
  
  void prof_frame_pause(prof_frame_t*, double current_measurement);
  void prof_frame_unpause(prof_frame_t*, double current_measurement);
  
  /* Current stack of active methods.*/
  typedef struct prof_stack_t
  {
      prof_frame_t* start;
      prof_frame_t* end;
      prof_frame_t* ptr;
  } prof_stack_t;
  
  prof_stack_t* prof_stack_create(void);
  void prof_stack_free(prof_stack_t* stack);
  
  prof_frame_t* prof_frame_current(prof_stack_t* stack);
  prof_frame_t* prof_frame_push(prof_stack_t* stack, prof_call_tree_t* call_tree, double measurement, bool paused);
  prof_frame_t* prof_frame_unshift(prof_stack_t* stack, prof_call_tree_t* parent_call_tree, prof_call_tree_t* call_tree, double measurement);
  prof_frame_t* prof_frame_pop(prof_stack_t* stack, double measurement);
  prof_method_t* prof_find_method(prof_stack_t* stack, VALUE source_file, int source_line);
  
  #endif //__RP_STACK__
  