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/* basic_blocks.c  -  Basic-block level related code: reading/writing

   of basic-block info to/from gmon.out; computing and formatting of

   basic-block related statistics.

   Copyright 1999, 2000, 2001, 2002, 2004, 2005, 2007

   Free Software Foundation, Inc.

   This file is part of GNU Binutils.

   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, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#include "gprof.h"

#include "libiberty.h"

#include "basic_blocks.h"

#include "corefile.h"

#include "gmon_io.h"

#include "gmon_out.h"

#include "search_list.h"

#include "source.h"

#include "symtab.h"

#include "sym_ids.h"

static int cmp_bb (const PTR, const PTR);

static int cmp_ncalls (const PTR, const PTR);

static void fskip_string (FILE *);

static void annotate_with_count (char *, unsigned int, int, PTR);

/* Default option values:  */

bfd_boolean bb_annotate_all_lines = FALSE;

unsigned long bb_min_calls = 1;

int bb_table_length = 10;

/* Variables used to compute annotated source listing stats:  */

static long num_executable_lines;

static long num_lines_executed;

/* Helper for sorting.  Compares two symbols and returns result

   such that sorting will be increasing according to filename, line

   number, and address (in that order).  */

static int

cmp_bb (const PTR lp, const PTR rp)

{

  int r;

  const Sym *left = *(const Sym **) lp;

  const Sym *right = *(const Sym **) rp;

  if (left->file && right->file)

    {

      r = strcmp (left->file->name, right->file->name);

      if (r)

        return r;

      if (left->line_num != right->line_num)

        return left->line_num - right->line_num;

    }

  if (left->addr < right->addr)

    return -1;

  else if (left->addr > right->addr)

    return 1;

  else

    return 0;

}

/* Helper for sorting.  Order basic blocks in decreasing number of

   calls, ties are broken in increasing order of line numbers.  */

static int

cmp_ncalls (const PTR lp, const PTR rp)

{

  const Sym *left = *(const Sym **) lp;

  const Sym *right = *(const Sym **) rp;

  if (!left)

    return 1;

  else if (!right)

    return -1;

  if (left->ncalls < right->ncalls)

    return 1;

  else if (left->ncalls > right->ncalls)

    return -1;

  return left->line_num - right->line_num;

}

/* Skip over variable length string.  */

static void

fskip_string (FILE *fp)

{

  int ch;

  while ((ch = fgetc (fp)) != EOF)

    {

      if (ch == '\0')

        break;

    }

}

/* Read a basic-block record from file IFP.  FILENAME is the name

   of file IFP and is provided for formatting error-messages only.  */

void

bb_read_rec (FILE *ifp, const char *filename)

{

  unsigned int nblocks, b;

  bfd_vma addr, ncalls;

  Sym *sym;

  if (gmon_io_read_32 (ifp, &nblocks))

    {

      fprintf (stderr, _("%s: %s: unexpected end of file\n"),

               whoami, filename);

      done (1);

    }

  nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);

  if (gmon_file_version == 0)

    fskip_string (ifp);

  for (b = 0; b < nblocks; ++b)

    {

      if (gmon_file_version == 0)

        {

          int line_num;

          /* Version 0 had lots of extra stuff that we don't

             care about anymore.  */

          if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)

              || (fread (&addr, sizeof (addr), 1, ifp) != 1)

              || (fskip_string (ifp), FALSE)

              || (fskip_string (ifp), FALSE)

              || (fread (&line_num, sizeof (line_num), 1, ifp) != 1))

            {

              perror (filename);

              done (1);

            }

        }

      else if (gmon_io_read_vma (ifp, &addr)

               || gmon_io_read_vma (ifp, &ncalls))

        {

          perror (filename);

          done (1);

        }

      /* Basic-block execution counts are meaningful only if we're

         profiling at the line-by-line level:  */

      if (line_granularity)

        {

          sym = sym_lookup (&symtab, addr);

          if (sym)

            {

              int i;

              DBG (BBDEBUG,

                   printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%lu\n",

                           (unsigned long) addr, (unsigned long) sym->addr,

                           sym->name, sym->line_num, (unsigned long) ncalls));

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

                {

                  if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)

                    {

                      sym->bb_addr[i] = addr;

                      sym->bb_calls[i] += ncalls;

                      break;

                    }

                }

            }

        }

      else

        {

          static bfd_boolean user_warned = FALSE;

          if (!user_warned)

            {

              user_warned = TRUE;

              fprintf (stderr,

  _("%s: warning: ignoring basic-block exec counts (use -l or --line)\n"),

                       whoami);

            }

        }

    }

  return;

}

/* Write all basic-blocks with non-zero counts to file OFP.  FILENAME

   is the name of OFP and is provided for producing error-messages

   only.  */

void

bb_write_blocks (FILE *ofp, const char *filename)

{

  unsigned int nblocks = 0;

  Sym *sym;

  int i;

  /* Count how many non-zero blocks with have:  */

  for (sym = symtab.base; sym < symtab.limit; ++sym)

    {

      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)

        ;

      nblocks += i;

    }

  /* Write header:  */

  if (gmon_io_write_8 (ofp, GMON_TAG_BB_COUNT)

      || gmon_io_write_32 (ofp, nblocks))

    {

      perror (filename);

      done (1);

    }

  /* Write counts:  */

  for (sym = symtab.base; sym < symtab.limit; ++sym)

    {

      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)

        {

          if (gmon_io_write_vma (ofp, sym->bb_addr[i])

              || gmon_io_write_vma (ofp, (bfd_vma) sym->bb_calls[i]))

            {

              perror (filename);

              done (1);

            }

        }

    }

}

/* Output basic-block statistics in a format that is easily parseable.

   Current the format is:

        <filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>  */

void

print_exec_counts ()

{

  Sym **sorted_bbs, *sym;

  unsigned int i, j, len;

  if (first_output)

    first_output = FALSE;

  else

    printf ("\f\n");

  /* Sort basic-blocks according to function name and line number:  */

  sorted_bbs = (Sym **) xmalloc (symtab.len * sizeof (sorted_bbs[0]));

  len = 0;

  for (sym = symtab.base; sym < symtab.limit; ++sym)

    {

      /* Accept symbol if it's in the INCL_EXEC table

         or there is no INCL_EXEC table

         and it does not appear in the EXCL_EXEC table.  */

      if (sym_lookup (&syms[INCL_EXEC], sym->addr)

          || (syms[INCL_EXEC].len == 0

              && !sym_lookup (&syms[EXCL_EXEC], sym->addr)))

        {

          sorted_bbs[len++] = sym;

        }

    }

  qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);

  /* Output basic-blocks:  */

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

    {

      sym = sorted_bbs [i];

      if (sym->ncalls > 0 || ! ignore_zeros)

        {

          /* FIXME: This only works if bfd_vma is unsigned long.  */

          printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),

                  sym->file ? sym->file->name : _("<unknown>"), sym->line_num,

                  sym->name, (unsigned long) sym->addr, sym->ncalls);

        }

      for (j = 0; j < NBBS && sym->bb_addr[j]; j ++)

        {

          if (sym->bb_calls[j] > 0 || ! ignore_zeros)

            {

              /* FIXME: This only works if bfd_vma is unsigned long.  */

              printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),

                      sym->file ? sym->file->name : _("<unknown>"), sym->line_num,

                      sym->name, (unsigned long) sym->bb_addr[j],

                      sym->bb_calls[j]);

            }

        }

    }

  free (sorted_bbs);

}

/* Helper for bb_annotated_source: format annotation containing

   number of line executions.  Depends on being called on each

   line of a file in sequential order.

   Global variable bb_annotate_all_lines enables execution count

   compression (counts are supressed if identical to the last one)

   and prints counts on all executed lines.  Otherwise, print

   all basic-block execution counts exactly once on the line

   that starts the basic-block.  */

static void

annotate_with_count (char *buf, unsigned int width, int line_num, PTR arg)

{

  Source_File *sf = (Source_File *) arg;

  Sym *b;

  unsigned int i;

  static unsigned long last_count;

  unsigned long last_print = (unsigned long) -1;

  b = NULL;

  if (line_num <= sf->num_lines)

    b = (Sym *) sf->line[line_num - 1];

  if (!b)

    {

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

        buf[i] = ' ';

      buf[width] = '\0';

    }

  else

    {

      char tmpbuf[NBBS * 30];

      char *p;

      unsigned long ncalls;

      int ncalls_set;

      unsigned int len;

      ++num_executable_lines;

      p = tmpbuf;

      *p = '\0';

      ncalls = 0;

      ncalls_set = 0;

      /* If this is a function entry point, label the line no matter what.

         Otherwise, we're in the middle of a function, so check to see

         if the first basic-block address is larger than the starting

         address of the line.  If so, then this line begins with a

         a portion of the previous basic-block, so print that prior

         execution count (if bb_annotate_all_lines is set).  */

      if (b->is_func)

        {

          sprintf (p, "%lu", b->ncalls);

          p += strlen (p);

          last_count = b->ncalls;

          last_print = last_count;

          ncalls = b->ncalls;

          ncalls_set = 1;

        }

      else if (bb_annotate_all_lines

               && b->bb_addr[0] && b->bb_addr[0] > b->addr)

        {

          sprintf (p, "%lu", last_count);

          p += strlen (p);

          last_print = last_count;

          ncalls = last_count;

          ncalls_set = 1;

        }

      /* Loop through all of this line's basic-blocks.  For each one,

         update last_count, then compress sequential identical counts

         (if bb_annotate_all_lines) and print the execution count.  */

      for (i = 0; i < NBBS && b->bb_addr[i]; i++)

        {

          last_count = b->bb_calls[i];

          if (! ncalls_set)

            {

              ncalls = 0;

              ncalls_set = 1;

            }

          ncalls += last_count;

          if (bb_annotate_all_lines && last_count == last_print)

            continue;

          if (p > tmpbuf)

            *p++ = ',';

          sprintf (p, "%lu", last_count);

          p += strlen (p);

          last_print = last_count;

        }

      /* We're done.  If nothing has been printed on this line,

         print the last execution count (bb_annotate_all_lines),

         which could be from either a previous line (if there were

         no BBs on this line), or from this line (if all our BB

         counts were compressed out because they were identical).  */

      if (bb_annotate_all_lines && p == tmpbuf)

        {

          sprintf (p, "%lu", last_count);

          p += strlen (p);

          ncalls = last_count;

          ncalls_set = 1;

        }

      if (! ncalls_set)

        {

          unsigned int c;

          for (c = 0; c < width; c++)

            buf[c] = ' ';

          buf[width] = '\0';

          return;

        }

      ++num_lines_executed;

      if (ncalls < bb_min_calls)

        {

          strcpy (tmpbuf, "#####");

          p = tmpbuf + 5;

        }

      strcpy (p, " -> ");

      p += 4;

      len = p - tmpbuf;

      if (len >= width)

        {

          strncpy (buf, tmpbuf, width);

          buf[width] = '\0';

        }

      else

        {

          unsigned int c;

          strcpy (buf + width - len, tmpbuf);

          for (c = 0; c < width - len; ++c)

            buf[c] = ' ';

        }

    }

}

/* Annotate the files named in SOURCE_FILES with basic-block statistics

   (execution counts).  After each source files, a few statistics

   regarding that source file are printed.  */

void

print_annotated_source ()

{

  Sym *sym, *line_stats, *new_line;

  Source_File *sf;

  int i, table_len;

  FILE *ofp;

  /* Find maximum line number for each source file that user is

     interested in:  */

  for (sym = symtab.base; sym < symtab.limit; ++sym)

    {

      /* Accept symbol if it's file is known, its line number is

         bigger than anything we have seen for that file so far and

         if it's in the INCL_ANNO table or there is no INCL_ANNO

         table and it does not appear in the EXCL_ANNO table.  */

      if (sym->file && sym->line_num > sym->file->num_lines

          && (sym_lookup (&syms[INCL_ANNO], sym->addr)

              || (syms[INCL_ANNO].len == 0

                  && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))

        {

          sym->file->num_lines = sym->line_num;

        }

    }

  /* Allocate line descriptors:  */

  for (sf = first_src_file; sf; sf = sf->next)

    {

      if (sf->num_lines > 0)

        {

          sf->line = (void **) xmalloc (sf->num_lines * sizeof (sf->line[0]));

          memset (sf->line, 0, sf->num_lines * sizeof (sf->line[0]));

        }

    }

  /* Count executions per line:  */

  for (sym = symtab.base; sym < symtab.limit; ++sym)

    {

      if (sym->file && sym->file->num_lines

          && (sym_lookup (&syms[INCL_ANNO], sym->addr)

              || (syms[INCL_ANNO].len == 0

                  && !sym_lookup (&syms[EXCL_ANNO], sym->addr))))

        {

          sym->file->ncalls += sym->ncalls;

          line_stats = (Sym *) sym->file->line[sym->line_num - 1];

          if (!line_stats)

            {

              /* Common case has at most one basic-block per source line:  */

              sym->file->line[sym->line_num - 1] = sym;

            }

          else if (!line_stats->addr)

            {

              /* sym is the 3rd .. nth basic block for this line:  */

              line_stats->ncalls += sym->ncalls;

            }

          else

            {

              /* sym is the second basic block for this line.  */

              new_line = (Sym *) xmalloc (sizeof (*new_line));

              *new_line = *line_stats;

              new_line->addr = 0;

              new_line->ncalls += sym->ncalls;

              sym->file->line[sym->line_num - 1] = new_line;

            }

        }

    }

  /* Plod over source files, annotating them:  */

  for (sf = first_src_file; sf; sf = sf->next)

    {

      if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0))

        continue;

      num_executable_lines = num_lines_executed = 0;

      ofp = annotate_source (sf, 16, annotate_with_count, sf);

      if (!ofp)

        continue;

      if (bb_table_length > 0)

        {

          fprintf (ofp, _("\n\nTop %d Lines:\n\n     Line      Count\n\n"),

                   bb_table_length);

          /* Abuse line arrays---it's not needed anymore:  */

          qsort (sf->line, sf->num_lines, sizeof (sf->line[0]), cmp_ncalls);

          table_len = bb_table_length;

          if (table_len > sf->num_lines)

            table_len = sf->num_lines;

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

            {

              sym = (Sym *) sf->line[i];

              if (!sym || sym->ncalls == 0)

                  break;

              fprintf (ofp, "%9d %10lu\n", sym->line_num, sym->ncalls);

            }

        }

      free (sf->line);

      sf->line = 0;

      fprintf (ofp, _("\nExecution Summary:\n\n"));

      fprintf (ofp, _("%9ld   Executable lines in this file\n"),

               num_executable_lines);

      fprintf (ofp, _("%9ld   Lines executed\n"), num_lines_executed);

      fprintf (ofp, _("%9.2f   Percent of the file executed\n"),

               num_executable_lines

               ? 100.0 * num_lines_executed / (double) num_executable_lines

               : 100.0);

      fprintf (ofp, _("\n%9lu   Total number of line executions\n"),

               sf->ncalls);

      fprintf (ofp, _("%9.2f   Average executions per line\n"),

               num_executable_lines

               ? (double) sf->ncalls / (double) num_executable_lines

               : 0.0);

      if (ofp != stdout)

        fclose (ofp);

    }

}