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/* profiler.c -- profiling utility

   Copyright (C) 2001 Marko Mlinar, markom@opencores.org

   Copyright (C) 2008 Embecosm Limited

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.

   This program is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by the Free

   Software Foundation; either version 3 of the License, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

   more details.

   You should have received a copy of the GNU General Public License along

   with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

/* Command line utility, that displays profiling information, generated

   by or1ksim. (use profile command interactively, when running or1ksim, or

   separate psim command).  */

#define PROF_DEBUG 0

/* Autoconf and/or portability configuration */

#include "config.h"

#include "port.h"

/* Package includes */

#include "profiler.h"

#include "sim-config.h"

#include "argtable2.h"

/*! Maximum stack frames that can be profiled */

#define MAX_STACK  262144

/*! Data structure representing information about a stack frame */

struct stack_struct

{

  unsigned int  addr;      /*!< Function address */

  unsigned int  cycles;    /*!< Cycles of func start; subfuncs added later */

  unsigned int  raddr;     /*!< Return address */

  char          name[33];  /*!< Name of the function */

};

/*! Global: data about functions */

struct func_struct  prof_func[MAX_FUNCS];

/*! Global: total number of functions */

int  prof_nfuncs = 0;

/*! Global: current cycles */

int  prof_cycles = 0;

/*! Representation of the stack */

static struct stack_struct  stack[MAX_STACK];

/*! Current depth */

static int  nstack = 0;

/*! Max depth */

static int  maxstack = 0;

/*! Number of total calls */

static int  ntotcalls = 0;

/*! Number of covered calls */

static int  nfunccalls = 0;

/*! Whether we are in cumulative mode */

static int  cumulative = 0;

/*! Whether we should not report warnings */

static int  quiet = 0;

/*! File to read from */

static FILE *fprof = 0;

/*---------------------------------------------------------------------------*/

/*! Acquire data from profiler file

  @param[in] fprofname   Data file to analyse

  @return  0 on success, return code otherwise                               */

/*---------------------------------------------------------------------------*/

int

prof_acquire (const char *fprofname)

{

  int line = 0;

  int reopened = 0;

  if (runtime.sim.fprof)

    {

      fprof = runtime.sim.fprof;

      reopened = 1;

      if (PROF_DEBUG) printf("reopened=1\n");

      rewind (fprof);

    }

  else

    fprof = fopen (fprofname, "rt");

  if (!fprof)

    {

      fprintf (stderr, "Cannot open profile file: %s\n", fprofname);

      return 1;

    }

  int ctr =0;

  while (1)

    {

      if (PROF_DEBUG) printf("%d ",ctr++);

      char dir = fgetc (fprof);

      line++;

      if (dir == '+')

        {

          if (fscanf

              (fprof, "%08X %08X %08X %s\n", &stack[nstack].cycles,

               &stack[nstack].raddr, &stack[nstack].addr,

               &stack[nstack].name[0]) != 4)

            fprintf (stderr, "Error reading line #%i\n", line);

          else

            {

              prof_cycles = stack[nstack].cycles;

              nstack++;

              if (PROF_DEBUG) printf("+ 0x%.8x nstack %d\n",stack[nstack-1].raddr, nstack);

              if (nstack > maxstack)

                maxstack = nstack;

            }

          ntotcalls++;

        }

      else if (dir == '-')

        {

          struct stack_struct s;

          if (fscanf (fprof, "%08X %08X\n", &s.cycles, &s.raddr) != 2)

            fprintf (stderr, "Error reading line #%i\n", line);

          else

            {

              int i;

              prof_cycles = s.cycles;

              if (PROF_DEBUG) printf("- 0x%.8x nstack %d\n",s.raddr ,nstack);

              for (i = nstack - 1; i >= 0; i--)

                if (stack[i].raddr == s.raddr)

                  break;

              if (i >= 0)

                {

                  /* pop everything above current from stack,

                     if more than one, something went wrong */

                  while (nstack > i)

                    {

                      int j;

                      long time;

                      nstack--;

                      time = s.cycles - stack[nstack].cycles;

                      if (!quiet && time < 0)

                        {

                          fprintf (stderr,

                                   "WARNING: Negative time at %s (return addr = %08X).\n",

                                   stack[i].name, stack[i].raddr);

                          time = 0;

                        }

                      /* Whether in normal mode, we must substract called function from execution time.  */

                      if (!cumulative)

                        for (j = 0; j < nstack; j++)

                          stack[j].cycles += time;

                      if (!quiet && i != nstack)

                        fprintf (stderr,

                                 "WARNING: Missaligned return call for %s (%08X) (found %s @ %08X), closing.\n",

                                 stack[nstack].name, stack[nstack].raddr,

                                 stack[i].name, stack[i].raddr);

                      for (j = 0; j < prof_nfuncs; j++)

                        if (stack[nstack].addr == prof_func[j].addr)

                          {     /* function exists, append. */

                            prof_func[j].cum_cycles += time;

                            prof_func[j].calls++;

                            nfunccalls++;

                            break;

                          }

                      if (j >= prof_nfuncs)

                        {       /* function does not yet exist, create new. */

                          prof_func[prof_nfuncs].cum_cycles = time;

                          prof_func[prof_nfuncs].calls = 1;

                          nfunccalls++;

                          prof_func[prof_nfuncs].addr = stack[nstack].addr;

                          strcpy (prof_func[prof_nfuncs].name,

                                  stack[nstack].name);

                          prof_nfuncs++;

                        }

                    }

                }

              else if (!quiet)

                fprintf (stderr,

                         "WARNING: Cannot find return call for (%08X), ignoring.\n",

                         s.raddr);

            }

        }

      else

        break;

    }

  /* If we have reopened the file, we need to add end of "[outside functions]" */

  if (reopened)

    {

      prof_cycles = runtime.sim.cycles;

      /* pop everything above current from stack,

         if more than one, something went wrong */

      while (nstack > 0)

        {

          int j;

          long time;

          nstack--;

          time = runtime.sim.cycles - stack[nstack].cycles;

          /* Whether in normal mode, we must substract called function from execution time.  */

          if (!cumulative)

            for (j = 0; j < nstack; j++)

              stack[j].cycles += time;

          for (j = 0; j < prof_nfuncs; j++)

            if (stack[nstack].addr == prof_func[j].addr)

              {                 /* function exists, append. */

                prof_func[j].cum_cycles += time;

                prof_func[j].calls++;

                nfunccalls++;

                break;

              }

          if (j >= prof_nfuncs)

            {                   /* function does not yet exist, create new. */

              prof_func[prof_nfuncs].cum_cycles = time;

              prof_func[prof_nfuncs].calls = 1;

              nfunccalls++;

              prof_func[prof_nfuncs].addr = stack[nstack].addr;

              strcpy (prof_func[prof_nfuncs].name, stack[nstack].name);

              prof_nfuncs++;

            }

        }

    }

  else

    fclose (fprof);

  return 0;

}

/* Print out profiling data */

static void

prof_print ()

{

  int i, j;

  if (cumulative)

    PRINTF ("CUMULATIVE TIMES\n");

  PRINTF

    ("---------------------------------------------------------------------------\n");

  PRINTF

    ("|function name            |addr    |# calls |avg cycles  |total cyles     |\n");

  PRINTF

    ("|-------------------------+--------+--------+------------+----------------|\n");

  for (j = 0; j < prof_nfuncs; j++)

    {

      int bestcyc = 0, besti = 0;

      for (i = 0; i < prof_nfuncs; i++)

        if (prof_func[i].cum_cycles > bestcyc)

          {

            bestcyc = prof_func[i].cum_cycles;

            besti = i;

          }

      i = besti;

      PRINTF ("| %-24s|%08X|%8li|%12.1f|%11li,%3.0f%%|\n",

              prof_func[i].name, prof_func[i].addr, prof_func[i].calls,

              ((double) prof_func[i].cum_cycles / prof_func[i].calls),

              prof_func[i].cum_cycles,

              (100. * prof_func[i].cum_cycles / prof_cycles));

      prof_func[i].cum_cycles = -1;

    }

  PRINTF

    ("---------------------------------------------------------------------------\n");

  PRINTF ("Total %i functions, %i cycles.\n", prof_nfuncs, prof_cycles);

  PRINTF ("Total function calls %i/%i (max depth %i).\n", nfunccalls,

          ntotcalls, maxstack);

}

/* Set options */

void

prof_set (int _quiet, int _cumulative)

{

  quiet = _quiet;

  cumulative = _cumulative;

}

/*---------------------------------------------------------------------------*/

/*! Parse the arguments for the profiling utility

    Updated by Jeremy Bennett to use argtable2. Also has an option just to

    print help, for use with the CLI.

    @param[in] argc       Number of command args

    @param[in] argv       Vector of the command args

    @param[in] just_help  If 1 (true), ignore argc & argv and just print out

                          the help message without parsing args

    @return  0 on success, 1 on failure                                      */

/*---------------------------------------------------------------------------*/

int

main_profiler (int argc, char *argv[], int just_help)

{

  struct arg_lit *vercop;

  struct arg_lit *help;

  struct arg_lit *cum_arg;

  struct arg_lit *quiet_arg;

  struct arg_file *gen_file;

  struct arg_end *end;

  void *argtab[6];

  int nerrors;

  /* Specify each argument, with fallback values */

  vercop = arg_lit0 ("v", "version", "version and copyright notice");

  help = arg_lit0 ("h", "help", "print this help message");

  cum_arg = arg_lit0 ("c", "cumulative",

                      "cumulative sum of cycles in functions");

  quiet_arg = arg_lit0 ("q", "quiet", "suppress messages");

  gen_file = arg_file0 ("g", "generate", "<file>",

                        "data file to analyse (default " "sim.profile)");

  gen_file->filename[0] = "sim.profile";

  end = arg_end (20);

  /* Set up the argument table */

  argtab[0] = vercop;

  argtab[1] = help;

  argtab[2] = cum_arg;

  argtab[3] = quiet_arg;

  argtab[4] = gen_file;

  argtab[5] = end;

  /* If we are just asked for a help message, then we don't parse the

     args. This is used to implement the help function from the CLI. */

  if (just_help)

    {

      printf ("profile");

      arg_print_syntax (stdout, argtab, "\n");

      arg_print_glossary (stdout, argtab, "  %-25s %s\n");

      arg_freetable (argtab, sizeof (argtab) / sizeof (argtab[0]));

      return 0;

    }

  /* Parse */

  nerrors = arg_parse (argc, argv, argtab);

  /* Special case here is if help or version is specified, we ignore any other

     errors and just print the help or version information and then give up. */

  if (vercop->count > 0)

    {

      PRINTF ("OpenRISC 1000 Profiling Utility, version %s\n",

              PACKAGE_VERSION);

      arg_freetable (argtab, sizeof (argtab) / sizeof (argtab[0]));

      return 0;

    }

  if (help->count > 0)

    {

      printf ("Usage: %s ", argv[0]);

      arg_print_syntax (stdout, argtab, "\n");

      arg_print_glossary (stdout, argtab, "  %-25s %s\n");

      arg_freetable (argtab, sizeof (argtab) / sizeof (argtab[0]));

      return 0;

    }

  /* Deal with any errors */

  if (0 != nerrors)

    {

      arg_print_errors (stderr, end, "profile");

      fprintf (stderr, "Usage: %s ", argv[0]);

      arg_print_syntaxv (stderr, argtab, "\n");

      arg_freetable (argtab, sizeof (argtab) / sizeof (argtab[0]));

      return 1;

    }

  /* Cumulative result wanted? */

  cumulative = cum_arg->count;

  /* Suppress messages? */

  quiet = quiet_arg->count;

  /* Get the profile from the file */

  prof_acquire (gen_file->filename[0]);

  /* Now we have all data acquired. Print out. */

  prof_print ();

  arg_freetable (argtab, sizeof (argtab) / sizeof (argtab[0]));

  return 0;

}                               /* main_profiler() */