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/* Routines required for instrumenting a program.  */

/* Compile this one with gcc.  */

/* Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,

   2000, 2001, 2002, 2003, 2004, 2005  Free Software Foundation, Inc.

This file is part of GCC.

GCC 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 2, or (at your option) any later

version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file into combinations with other programs,

and to distribute those combinations without any restriction coming

from the use of this file.  (The General Public License restrictions

do apply in other respects; for example, they cover modification of

the file, and distribution when not linked into a combine

executable.)

GCC 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 GCC; see the file COPYING.  If not, write to the Free

Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.  */

#include "tconfig.h"

#include "tsystem.h"

#include "coretypes.h"

#include "tm.h"

#if defined(inhibit_libc)

#define IN_LIBGCOV (-1)

#else

#undef NULL /* Avoid errors if stdio.h and our stddef.h mismatch.  */

#include <stdio.h>

#define IN_LIBGCOV 1

#if defined(L_gcov)

#define GCOV_LINKAGE /* nothing */

#endif

#endif

#include "gcov-io.h"

#if defined(inhibit_libc)

/* If libc and its header files are not available, provide dummy functions.  */

#ifdef L_gcov

void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}

void __gcov_flush (void) {}

#endif

#ifdef L_gcov_merge_add

void __gcov_merge_add (gcov_type *counters  __attribute__ ((unused)),

                       unsigned n_counters __attribute__ ((unused))) {}

#endif

#ifdef L_gcov_merge_single

void __gcov_merge_single (gcov_type *counters  __attribute__ ((unused)),

                          unsigned n_counters __attribute__ ((unused))) {}

#endif

#ifdef L_gcov_merge_delta

void __gcov_merge_delta (gcov_type *counters  __attribute__ ((unused)),

                         unsigned n_counters __attribute__ ((unused))) {}

#endif

#else

#include <string.h>

#if GCOV_LOCKED

#include <fcntl.h>

#include <errno.h>

#include <sys/stat.h>

#endif

#ifdef L_gcov

#include "gcov-io.c"

/* Chain of per-object gcov structures.  */

static struct gcov_info *gcov_list;

/* A program checksum allows us to distinguish program data for an

   object file included in multiple programs.  */

static gcov_unsigned_t gcov_crc32;

/* Size of the longest file name. */

static size_t gcov_max_filename = 0;

#ifdef TARGET_POSIX_IO

/* Make sure path component of the given FILENAME exists, create

   missing directories. FILENAME must be writable.

   Returns zero on success, or -1 if an error occurred.  */

static int

create_file_directory (char *filename)

{

  char *s;

  for (s = filename + 1; *s != '\0'; s++)

    if (IS_DIR_SEPARATOR(*s))

      {

        char sep = *s;

        *s  = '\0';

        /* Try to make directory if it doesn't already exist.  */

        if (access (filename, F_OK) == -1

            && mkdir (filename, 0755) == -1

            /* The directory might have been made by another process.  */

            && errno != EEXIST)

          {

            fprintf (stderr, "profiling:%s:Cannot create directory\n",

                     filename);

            *s = sep;

            return -1;

          };

        *s = sep;

      };

  return 0;

}

#endif

/* Check if VERSION of the info block PTR matches libgcov one.

   Return 1 on success, or zero in case of versions mismatch.

   If FILENAME is not NULL, its value used for reporting purposes

   instead of value from the info block.  */

static int

gcov_version (struct gcov_info *ptr, gcov_unsigned_t version,

              const char *filename)

{

  if (version != GCOV_VERSION)

    {

      char v[4], e[4];

      GCOV_UNSIGNED2STRING (v, version);

      GCOV_UNSIGNED2STRING (e, GCOV_VERSION);

      fprintf (stderr,

               "profiling:%s:Version mismatch - expected %.4s got %.4s\n",

               filename? filename : ptr->filename, e, v);

      return 0;

    }

  return 1;

}

/* Dump the coverage counts. We merge with existing counts when

   possible, to avoid growing the .da files ad infinitum. We use this

   program's checksum to make sure we only accumulate whole program

   statistics to the correct summary. An object file might be embedded

   in two separate programs, and we must keep the two program

   summaries separate.  */

static void

gcov_exit (void)

{

  struct gcov_info *gi_ptr;

  struct gcov_summary this_program;

  struct gcov_summary all;

  struct gcov_ctr_summary *cs_ptr;

  const struct gcov_ctr_info *ci_ptr;

  unsigned t_ix;

  gcov_unsigned_t c_num;

  const char *gcov_prefix;

  int gcov_prefix_strip = 0;

  size_t prefix_length;

  char *gi_filename, *gi_filename_up;

  memset (&all, 0, sizeof (all));

  /* Find the totals for this execution.  */

  memset (&this_program, 0, sizeof (this_program));

  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)

    {

      ci_ptr = gi_ptr->counts;

      for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)

        {

          if (!((1 << t_ix) & gi_ptr->ctr_mask))

            continue;

          cs_ptr = &this_program.ctrs[t_ix];

          cs_ptr->num += ci_ptr->num;

          for (c_num = 0; c_num < ci_ptr->num; c_num++)

            {

              cs_ptr->sum_all += ci_ptr->values[c_num];

              if (cs_ptr->run_max < ci_ptr->values[c_num])

                cs_ptr->run_max = ci_ptr->values[c_num];

            }

          ci_ptr++;

        }

    }

  /* Get file name relocation prefix.  Non-absolute values are ignored. */

  gcov_prefix = getenv("GCOV_PREFIX");

  if (gcov_prefix && IS_ABSOLUTE_PATH (gcov_prefix))

    {

      /* Check if the level of dirs to strip off specified. */

      char *tmp = getenv("GCOV_PREFIX_STRIP");

      if (tmp)

        {

          gcov_prefix_strip = atoi (tmp);

          /* Do not consider negative values. */

          if (gcov_prefix_strip < 0)

            gcov_prefix_strip = 0;

        }

      prefix_length = strlen(gcov_prefix);

      /* Remove an unnecessary trailing '/' */

      if (IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))

        prefix_length--;

    }

  else

    prefix_length = 0;

  /* Allocate and initialize the filename scratch space.  */

  gi_filename = (char *) alloca (prefix_length + gcov_max_filename + 1);

  if (prefix_length)

    memcpy (gi_filename, gcov_prefix, prefix_length);

  gi_filename_up = gi_filename + prefix_length;

  /* Now merge each file.  */

  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)

    {

      struct gcov_summary this_object;

      struct gcov_summary object, program;

      gcov_type *values[GCOV_COUNTERS];

      const struct gcov_fn_info *fi_ptr;

      unsigned fi_stride;

      unsigned c_ix, f_ix, n_counts;

      struct gcov_ctr_summary *cs_obj, *cs_tobj, *cs_prg, *cs_tprg, *cs_all;

      int error = 0;

      gcov_unsigned_t tag, length;

      gcov_position_t summary_pos = 0;

      gcov_position_t eof_pos = 0;

      memset (&this_object, 0, sizeof (this_object));

      memset (&object, 0, sizeof (object));

      /* Build relocated filename, stripping off leading

         directories from the initial filename if requested. */

      if (gcov_prefix_strip > 0)

        {

          int level = 0;

          const char *fname = gi_ptr->filename;

          const char *s;

          /* Skip selected directory levels. */

          for (s = fname + 1; (*s != '\0') && (level < gcov_prefix_strip); s++)

            if (IS_DIR_SEPARATOR(*s))

              {

                fname = s;

                level++;

              };

          /* Update complete filename with stripped original. */

          strcpy (gi_filename_up, fname);

        }

      else

        strcpy (gi_filename_up, gi_ptr->filename);

      /* Totals for this object file.  */

      ci_ptr = gi_ptr->counts;

      for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)

        {

          if (!((1 << t_ix) & gi_ptr->ctr_mask))

            continue;

          cs_ptr = &this_object.ctrs[t_ix];

          cs_ptr->num += ci_ptr->num;

          for (c_num = 0; c_num < ci_ptr->num; c_num++)

            {

              cs_ptr->sum_all += ci_ptr->values[c_num];

              if (cs_ptr->run_max < ci_ptr->values[c_num])

                cs_ptr->run_max = ci_ptr->values[c_num];

            }

          ci_ptr++;

        }

      c_ix = 0;

      for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)

        if ((1 << t_ix) & gi_ptr->ctr_mask)

          {

            values[c_ix] = gi_ptr->counts[c_ix].values;

            c_ix++;

          }

      /* Calculate the function_info stride. This depends on the

         number of counter types being measured.  */

      fi_stride = sizeof (struct gcov_fn_info) + c_ix * sizeof (unsigned);

      if (__alignof__ (struct gcov_fn_info) > sizeof (unsigned))

        {

          fi_stride += __alignof__ (struct gcov_fn_info) - 1;

          fi_stride &= ~(__alignof__ (struct gcov_fn_info) - 1);

        }

      if (!gcov_open (gi_filename))

        {

#ifdef TARGET_POSIX_IO

          /* Open failed likely due to missed directory.

             Create directory and retry to open file. */

          if (create_file_directory (gi_filename))

            {

              fprintf (stderr, "profiling:%s:Skip\n", gi_filename);

              continue;

            }

#endif

          if (!gcov_open (gi_filename))

            {

              fprintf (stderr, "profiling:%s:Cannot open\n", gi_filename);

              continue;

            }

        }

      tag = gcov_read_unsigned ();

      if (tag)

        {

          /* Merge data from file.  */

          if (tag != GCOV_DATA_MAGIC)

            {

              fprintf (stderr, "profiling:%s:Not a gcov data file\n",

                       gi_filename);

              goto read_fatal;

            }

          length = gcov_read_unsigned ();

          if (!gcov_version (gi_ptr, length, gi_filename))

            goto read_fatal;

          length = gcov_read_unsigned ();

          if (length != gi_ptr->stamp)

            /* Read from a different compilation. Overwrite the file.  */

            goto rewrite;

          /* Merge execution counts for each function.  */

          for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)

            {

              fi_ptr = (const struct gcov_fn_info *)

                      ((const char *) gi_ptr->functions + f_ix * fi_stride);

              tag = gcov_read_unsigned ();

              length = gcov_read_unsigned ();

              /* Check function.  */

              if (tag != GCOV_TAG_FUNCTION

                  || length != GCOV_TAG_FUNCTION_LENGTH

                  || gcov_read_unsigned () != fi_ptr->ident

                  || gcov_read_unsigned () != fi_ptr->checksum)

                {

                read_mismatch:;

                  fprintf (stderr, "profiling:%s:Merge mismatch for %s\n",

                           gi_filename,

                           f_ix + 1 ? "function" : "summaries");

                  goto read_fatal;

                }

              c_ix = 0;

              for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)

                {

                  gcov_merge_fn merge;

                  if (!((1 << t_ix) & gi_ptr->ctr_mask))

                    continue;

                  n_counts = fi_ptr->n_ctrs[c_ix];

                  merge = gi_ptr->counts[c_ix].merge;

                  tag = gcov_read_unsigned ();

                  length = gcov_read_unsigned ();

                  if (tag != GCOV_TAG_FOR_COUNTER (t_ix)

                      || length != GCOV_TAG_COUNTER_LENGTH (n_counts))

                    goto read_mismatch;

                  (*merge) (values[c_ix], n_counts);

                  values[c_ix] += n_counts;

                  c_ix++;

                }

              if ((error = gcov_is_error ()))

                goto read_error;

            }

          f_ix = ~0u;

          /* Check program & object summary */

          while (1)

            {

              int is_program;

              eof_pos = gcov_position ();

              tag = gcov_read_unsigned ();

              if (!tag)

                break;

              length = gcov_read_unsigned ();

              is_program = tag == GCOV_TAG_PROGRAM_SUMMARY;

              if (length != GCOV_TAG_SUMMARY_LENGTH

                  || (!is_program && tag != GCOV_TAG_OBJECT_SUMMARY))

                goto read_mismatch;

              gcov_read_summary (is_program ? &program : &object);

              if ((error = gcov_is_error ()))

                goto read_error;

              if (is_program && program.checksum == gcov_crc32)

                {

                  summary_pos = eof_pos;

                  goto rewrite;

                }

            }

        }

      goto rewrite;

    read_error:;

      fprintf (stderr, error < 0 ? "profiling:%s:Overflow merging\n"

               : "profiling:%s:Error merging\n", gi_filename);

    read_fatal:;

      gcov_close ();

      continue;

    rewrite:;

      gcov_rewrite ();

      if (!summary_pos)

        memset (&program, 0, sizeof (program));

      /* Merge the summaries.  */

      f_ix = ~0u;

      for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)

        {

          cs_obj = &object.ctrs[t_ix];

          cs_tobj = &this_object.ctrs[t_ix];

          cs_prg = &program.ctrs[t_ix];

          cs_tprg = &this_program.ctrs[t_ix];

          cs_all = &all.ctrs[t_ix];

          if ((1 << t_ix) & gi_ptr->ctr_mask)

            {

              if (!cs_obj->runs++)

                cs_obj->num = cs_tobj->num;

              else if (cs_obj->num != cs_tobj->num)

                goto read_mismatch;

              cs_obj->sum_all += cs_tobj->sum_all;

              if (cs_obj->run_max < cs_tobj->run_max)

                cs_obj->run_max = cs_tobj->run_max;

              cs_obj->sum_max += cs_tobj->run_max;

              if (!cs_prg->runs++)

                cs_prg->num = cs_tprg->num;

              else if (cs_prg->num != cs_tprg->num)

                goto read_mismatch;

              cs_prg->sum_all += cs_tprg->sum_all;

              if (cs_prg->run_max < cs_tprg->run_max)

                cs_prg->run_max = cs_tprg->run_max;

              cs_prg->sum_max += cs_tprg->run_max;

            }

          else if (cs_obj->num || cs_prg->num)

            goto read_mismatch;

          if (!cs_all->runs && cs_prg->runs)

            memcpy (cs_all, cs_prg, sizeof (*cs_all));

          else if (!all.checksum

                   && (!GCOV_LOCKED || cs_all->runs == cs_prg->runs)

                   && memcmp (cs_all, cs_prg, sizeof (*cs_all)))

            {

              fprintf (stderr, "profiling:%s:Invocation mismatch - some data files may have been removed%s",

                       gi_filename, GCOV_LOCKED

                       ? "" : " or concurrent update without locking support");

              all.checksum = ~0u;

            }

        }

      c_ix = 0;

      for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)

        if ((1 << t_ix) & gi_ptr->ctr_mask)

          {

            values[c_ix] = gi_ptr->counts[c_ix].values;

            c_ix++;

          }

      program.checksum = gcov_crc32;

      /* Write out the data.  */

      gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION);

      gcov_write_unsigned (gi_ptr->stamp);

      /* Write execution counts for each function.  */

      for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)

        {

          fi_ptr = (const struct gcov_fn_info *)

                  ((const char *) gi_ptr->functions + f_ix * fi_stride);

          /* Announce function.  */

          gcov_write_tag_length (GCOV_TAG_FUNCTION, GCOV_TAG_FUNCTION_LENGTH);

          gcov_write_unsigned (fi_ptr->ident);

          gcov_write_unsigned (fi_ptr->checksum);

          c_ix = 0;

          for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)

            {

              gcov_type *c_ptr;

              if (!((1 << t_ix) & gi_ptr->ctr_mask))

                continue;

              n_counts = fi_ptr->n_ctrs[c_ix];

              gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix),

                                     GCOV_TAG_COUNTER_LENGTH (n_counts));

              c_ptr = values[c_ix];

              while (n_counts--)

                gcov_write_counter (*c_ptr++);

              values[c_ix] = c_ptr;

              c_ix++;

            }

        }

      /* Object file summary.  */

      gcov_write_summary (GCOV_TAG_OBJECT_SUMMARY, &object);

      /* Generate whole program statistics.  */

      if (eof_pos)

        gcov_seek (eof_pos);

      gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &program);

      if (!summary_pos)

        gcov_write_unsigned (0);

      if ((error = gcov_close ()))

          fprintf (stderr, error  < 0 ?

                   "profiling:%s:Overflow writing\n" :

                   "profiling:%s:Error writing\n",

                   gi_filename);

    }

}

/* Add a new object file onto the bb chain.  Invoked automatically

   when running an object file's global ctors.  */

void

__gcov_init (struct gcov_info *info)

{

  if (!info->version)

    return;

  if (gcov_version (info, info->version, 0))

    {

      const char *ptr = info->filename;

      gcov_unsigned_t crc32 = gcov_crc32;

      size_t filename_length =  strlen(info->filename);

      /* Refresh the longest file name information */

      if (filename_length > gcov_max_filename)

        gcov_max_filename = filename_length;

      do

        {

          unsigned ix;

          gcov_unsigned_t value = *ptr << 24;

          for (ix = 8; ix--; value <<= 1)

            {

              gcov_unsigned_t feedback;

              feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0;

              crc32 <<= 1;

              crc32 ^= feedback;

            }

        }

      while (*ptr++);

      gcov_crc32 = crc32;

      if (!gcov_list)

        atexit (gcov_exit);

      info->next = gcov_list;

      gcov_list = info;

    }

  info->version = 0;

}

/* Called before fork or exec - write out profile information gathered so

   far and reset it to zero.  This avoids duplication or loss of the

   profile information gathered so far.  */

void

__gcov_flush (void)

{

  const struct gcov_info *gi_ptr;

  gcov_exit ();

  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)

    {

      unsigned t_ix;

      const struct gcov_ctr_info *ci_ptr;

      for (t_ix = 0, ci_ptr = gi_ptr->counts; t_ix != GCOV_COUNTERS; t_ix++)

        if ((1 << t_ix) & gi_ptr->ctr_mask)

          {

            memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num);

            ci_ptr++;

          }

    }

}

#endif /* L_gcov */

#ifdef L_gcov_merge_add

/* The profile merging function that just adds the counters.  It is given

   an array COUNTERS of N_COUNTERS old counters and it reads the same number

   of counters from the gcov file.  */

void

__gcov_merge_add (gcov_type *counters, unsigned n_counters)

{

  for (; n_counters; counters++, n_counters--)

    *counters += gcov_read_counter ();

}

#endif /* L_gcov_merge_add */

#ifdef L_gcov_merge_single

/* The profile merging function for choosing the most common value.

   It is given an array COUNTERS of N_COUNTERS old counters and it

   reads the same number of counters from the gcov file.  The counters

   are split into 3-tuples where the members of the tuple have

   meanings:

   -- the stored candidate on the most common value of the measured entity

   -- counter

   -- total number of evaluations of the value  */

void

__gcov_merge_single (gcov_type *counters, unsigned n_counters)

{

  unsigned i, n_measures;

  gcov_type value, counter, all;

  gcc_assert (!(n_counters % 3));

  n_measures = n_counters / 3;

  for (i = 0; i < n_measures; i++, counters += 3)

    {

      value = gcov_read_counter ();

      counter = gcov_read_counter ();

      all = gcov_read_counter ();

      if (counters[0] == value)

        counters[1] += counter;

      else if (counter > counters[1])

        {

          counters[0] = value;

          counters[1] = counter - counters[1];

        }

      else

        counters[1] -= counter;

      counters[2] += all;

    }

}

#endif /* L_gcov_merge_single */

#ifdef L_gcov_merge_delta

/* The profile merging function for choosing the most common

   difference between two consecutive evaluations of the value.  It is

   given an array COUNTERS of N_COUNTERS old counters and it reads the

   same number of counters from the gcov file.  The counters are split

   into 4-tuples where the members of the tuple have meanings:

   -- the last value of the measured entity

   -- the stored candidate on the most common difference

   -- counter

   -- total number of evaluations of the value  */

void

__gcov_merge_delta (gcov_type *counters, unsigned n_counters)

{

  unsigned i, n_measures;

  gcov_type last, value, counter, all;

  gcc_assert (!(n_counters % 4));

  n_measures = n_counters / 4;