libgcov-util.c 37.6 KB
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/* Utility functions for reading gcda files into in-memory
   gcov_info structures and offline profile processing. */
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/* Copyright (C) 2014-2017 Free Software Foundation, Inc.
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   Contributed by Rong Xu <xur@google.com>.

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 3, or (at your option) any later
version.

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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */


#define IN_GCOV_TOOL 1

#include "libgcov.h"
#include "intl.h"
#include "diagnostic.h"
#include "version.h"
#include "demangle.h"

/* Borrowed from basic-block.h.  */
#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))

extern gcov_position_t gcov_position();
extern int gcov_is_error();

/* Verbose mode for debug.  */
static int verbose;

/* Set verbose flag.  */
void gcov_set_verbose (void)
{
  verbose = 1;
}

/* The following part is to read Gcda and reconstruct GCOV_INFO.  */

#include "obstack.h"
#include <unistd.h>
#ifdef HAVE_FTW_H
#include <ftw.h>
#endif

static void tag_function (unsigned, unsigned);
static void tag_blocks (unsigned, unsigned);
static void tag_arcs (unsigned, unsigned);
static void tag_lines (unsigned, unsigned);
static void tag_counters (unsigned, unsigned);
static void tag_summary (unsigned, unsigned);

/* The gcov_info for the first module.  */
static struct gcov_info *curr_gcov_info;
/* The gcov_info being processed.  */
static struct gcov_info *gcov_info_head;
/* This variable contains all the functions in current module.  */
static struct obstack fn_info;
/* The function being processed.  */
static struct gcov_fn_info *curr_fn_info;
/* The number of functions seen so far.  */
static unsigned num_fn_info;
/* This variable contains all the counters for current module.  */
static int k_ctrs_mask[GCOV_COUNTERS];
/* The kind of counters that have been seen.  */
static struct gcov_ctr_info k_ctrs[GCOV_COUNTERS];
/* Number of kind of counters that have been seen.  */
static int k_ctrs_types;

/* Merge functions for counters.  */
#define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) __gcov_merge ## FN_TYPE,
static gcov_merge_fn ctr_merge_functions[GCOV_COUNTERS] = {
#include "gcov-counter.def"
};
#undef DEF_GCOV_COUNTER

/* Set the ctrs field in gcov_fn_info object FN_INFO.  */

static void
set_fn_ctrs (struct gcov_fn_info *fn_info)
{
  int j = 0, i;

  for (i = 0; i < GCOV_COUNTERS; i++)
    {
      if (k_ctrs_mask[i] == 0)
        continue;
      fn_info->ctrs[j].num = k_ctrs[i].num;
      fn_info->ctrs[j].values = k_ctrs[i].values;
      j++;
    }
  if (k_ctrs_types == 0)
    k_ctrs_types = j;
  else
    gcc_assert (j == k_ctrs_types);
}

/* For each tag in gcda file, we have an entry here.
   TAG is the tag value; NAME is the tag name; and
   PROC is the handler function.  */

typedef struct tag_format
{
    unsigned tag;
    char const *name;
    void (*proc) (unsigned, unsigned);
} tag_format_t;

/* Handler table for various Tags.  */

static const tag_format_t tag_table[] =
{
  {0, "NOP", NULL},
  {0, "UNKNOWN", NULL},
  {0, "COUNTERS", tag_counters},
  {GCOV_TAG_FUNCTION, "FUNCTION", tag_function},
  {GCOV_TAG_BLOCKS, "BLOCKS", tag_blocks},
  {GCOV_TAG_ARCS, "ARCS", tag_arcs},
  {GCOV_TAG_LINES, "LINES", tag_lines},
  {GCOV_TAG_OBJECT_SUMMARY, "OBJECT_SUMMARY", tag_summary},
  {GCOV_TAG_PROGRAM_SUMMARY, "PROGRAM_SUMMARY", tag_summary},
  {0, NULL, NULL}
};

/* Handler for reading function tag.  */

static void
tag_function (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
  int i;

  /* write out previous fn_info.  */
  if (num_fn_info)
    {
      set_fn_ctrs (curr_fn_info);
      obstack_ptr_grow (&fn_info, curr_fn_info);
    }

  /* Here we over allocate a bit, using GCOV_COUNTERS instead of the actual active
     counter types.  */
  curr_fn_info = (struct gcov_fn_info *) xcalloc (sizeof (struct gcov_fn_info)
                   + GCOV_COUNTERS * sizeof (struct gcov_ctr_info), 1);

  for (i = 0; i < GCOV_COUNTERS; i++)
     k_ctrs[i].num = 0;
  k_ctrs_types = 0;

  curr_fn_info->key = curr_gcov_info;
  curr_fn_info->ident = gcov_read_unsigned ();
  curr_fn_info->lineno_checksum = gcov_read_unsigned ();
  curr_fn_info->cfg_checksum = gcov_read_unsigned ();
  num_fn_info++;

  if (verbose)
    fnotice (stdout, "tag one function id=%d\n", curr_fn_info->ident);
}

/* Handler for reading block tag.  */

static void
tag_blocks (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
  /* TBD: gcov-tool currently does not handle gcno files. Assert here.  */
  gcc_unreachable ();
}

/* Handler for reading flow arc tag.  */

static void
tag_arcs (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
  /* TBD: gcov-tool currently does not handle gcno files. Assert here.  */
  gcc_unreachable ();
}

/* Handler for reading line tag.  */

static void
tag_lines (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
  /* TBD: gcov-tool currently does not handle gcno files. Assert here.  */
  gcc_unreachable ();
}

/* Handler for reading counters array tag with value as TAG and length of LENGTH.  */

static void
tag_counters (unsigned tag, unsigned length)
{
  unsigned n_counts = GCOV_TAG_COUNTER_NUM (length);
  gcov_type *values;
  unsigned ix;
  unsigned tag_ix;

  tag_ix = GCOV_COUNTER_FOR_TAG (tag);
  gcc_assert (tag_ix < GCOV_COUNTERS);
  k_ctrs_mask [tag_ix] = 1;
  gcc_assert (k_ctrs[tag_ix].num == 0);
  k_ctrs[tag_ix].num = n_counts;

  k_ctrs[tag_ix].values = values = (gcov_type *) xmalloc (n_counts * sizeof (gcov_type));
  gcc_assert (values);

  for (ix = 0; ix != n_counts; ix++)
    values[ix] = gcov_read_counter ();
}

/* Handler for reading summary tag.  */

static void
tag_summary (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED)
{
  struct gcov_summary summary;

  gcov_read_summary (&summary);
}

/* This function is called at the end of reading a gcda file.
   It flushes the contents in curr_fn_info to gcov_info object OBJ_INFO.  */

static void
read_gcda_finalize (struct gcov_info *obj_info)
{
  int i;

  set_fn_ctrs (curr_fn_info);
  obstack_ptr_grow (&fn_info, curr_fn_info);

  /* We set the following fields: merge, n_functions, and functions.  */
  obj_info->n_functions = num_fn_info;
  obj_info->functions = (const struct gcov_fn_info**) obstack_finish (&fn_info);

  /* wrap all the counter array.  */
  for (i=0; i< GCOV_COUNTERS; i++)
    {
      if (k_ctrs_mask[i])
        obj_info->merge[i] = ctr_merge_functions[i];
    }
}

/* Read the content of a gcda file FILENAME, and return a gcov_info data structure.
   Program level summary CURRENT_SUMMARY will also be updated.  */

static struct gcov_info *
read_gcda_file (const char *filename)
{
  unsigned tags[4];
  unsigned depth = 0;
  unsigned magic, version;
  struct gcov_info *obj_info;
  int i;

  for (i=0; i< GCOV_COUNTERS; i++)
    k_ctrs_mask[i] = 0;
  k_ctrs_types = 0;

  if (!gcov_open (filename))
    {
      fnotice (stderr, "%s:cannot open\n", filename);
      return NULL;
    }

  /* Read magic.  */
  magic = gcov_read_unsigned ();
  if (magic != GCOV_DATA_MAGIC)
    {
      fnotice (stderr, "%s:not a gcov data file\n", filename);
      gcov_close ();
      return NULL;
    }

  /* Read version.  */
  version = gcov_read_unsigned ();
  if (version != GCOV_VERSION)
    {
      fnotice (stderr, "%s:incorrect gcov version %d vs %d \n", filename, version, GCOV_VERSION);
      gcov_close ();
      return NULL;
    }

  /* Instantiate a gcov_info object.  */
  curr_gcov_info = obj_info = (struct gcov_info *) xcalloc (sizeof (struct gcov_info) +
             sizeof (struct gcov_ctr_info) * GCOV_COUNTERS, 1);

  obj_info->version = version;
  obstack_init (&fn_info);
  num_fn_info = 0;
  curr_fn_info = 0;
  {
    size_t len = strlen (filename) + 1;
    char *str_dup = (char*) xmalloc (len);

    memcpy (str_dup, filename, len);
    obj_info->filename = str_dup;
  }

  /* Read stamp.  */
  obj_info->stamp = gcov_read_unsigned ();

  while (1)
    {
      gcov_position_t base;
      unsigned tag, length;
      tag_format_t const *format;
      unsigned tag_depth;
      int error;
      unsigned mask;

      tag = gcov_read_unsigned ();
      if (!tag)
        break;
      length = gcov_read_unsigned ();
      base = gcov_position ();
      mask = GCOV_TAG_MASK (tag) >> 1;
      for (tag_depth = 4; mask; mask >>= 8)
        {
          if (((mask & 0xff) != 0xff))
            {
              warning (0, "%s:tag `%x' is invalid\n", filename, tag);
              break;
            }
          tag_depth--;
        }
      for (format = tag_table; format->name; format++)
        if (format->tag == tag)
          goto found;
      format = &tag_table[GCOV_TAG_IS_COUNTER (tag) ? 2 : 1];
    found:;
      if (tag)
        {
          if (depth && depth < tag_depth)
            {
              if (!GCOV_TAG_IS_SUBTAG (tags[depth - 1], tag))
                warning (0, "%s:tag `%x' is incorrectly nested\n",
                         filename, tag);
            }
          depth = tag_depth;
          tags[depth - 1] = tag;
        }

      if (format->proc)
        {
          unsigned long actual_length;

          (*format->proc) (tag, length);

          actual_length = gcov_position () - base;
          if (actual_length > length)
            warning (0, "%s:record size mismatch %lu bytes overread\n",
                     filename, actual_length - length);
          else if (length > actual_length)
            warning (0, "%s:record size mismatch %lu bytes unread\n",
                     filename, length - actual_length);
       }

      gcov_sync (base, length);
      if ((error = gcov_is_error ()))
        {
          warning (0, error < 0 ? "%s:counter overflow at %lu\n" :
                                  "%s:read error at %lu\n", filename,
                   (long unsigned) gcov_position ());
          break;
        }
    }

  read_gcda_finalize (obj_info);
  gcov_close ();

  return obj_info;
}

#ifdef HAVE_FTW_H
/* This will be called by ftw(). It opens and read a gcda file FILENAME.
   Return a non-zero value to stop the tree walk.  */

static int
ftw_read_file (const char *filename,
               const struct stat *status ATTRIBUTE_UNUSED,
               int type)
{
  int filename_len;
  int suffix_len;
  struct gcov_info *obj_info;

  /* Only read regular files.  */
  if (type != FTW_F)
    return 0;

  filename_len = strlen (filename);
  suffix_len = strlen (GCOV_DATA_SUFFIX);

  if (filename_len <= suffix_len)
    return 0;

  if (strcmp(filename + filename_len - suffix_len, GCOV_DATA_SUFFIX))
    return 0;

  if (verbose)
    fnotice (stderr, "reading file: %s\n", filename);

  obj_info = read_gcda_file (filename);
  if (!obj_info)
    return 0;

  obj_info->next = gcov_info_head;
  gcov_info_head = obj_info;

  return 0;
}
#endif

/* Initializer for reading a profile dir.  */

static inline void
read_profile_dir_init (void)
{
  gcov_info_head = 0;
}

/* Driver for read a profile directory and convert into gcov_info list in memory.
   Return NULL on error,
   Return the head of gcov_info list on success.  */

struct gcov_info *
gcov_read_profile_dir (const char* dir_name, int recompute_summary ATTRIBUTE_UNUSED)
{
  char *pwd;
  int ret;

  read_profile_dir_init ();

  if (access (dir_name, R_OK) != 0)
    {
      fnotice (stderr, "cannot access directory %s\n", dir_name);
      return NULL;
    }
  pwd = getcwd (NULL, 0);
  gcc_assert (pwd);
  ret = chdir (dir_name);
  if (ret !=0)
    {
      fnotice (stderr, "%s is not a directory\n", dir_name);
      return NULL;
    }
#ifdef HAVE_FTW_H
  ftw (".", ftw_read_file, 50);
#endif
  ret = chdir (pwd);
  free (pwd);


  return gcov_info_head;;
}

/* This part of the code is to merge profile counters. These
   variables are set in merge_wrapper and to be used by
   global function gcov_read_counter_mem() and gcov_get_merge_weight.  */

/* We save the counter value address to this variable.  */
static gcov_type *gcov_value_buf;

/* The number of counter values to be read by current merging.  */
static gcov_unsigned_t gcov_value_buf_size;

/* The index of counter values being read.  */
static gcov_unsigned_t gcov_value_buf_pos;

/* The weight of current merging.  */
static unsigned gcov_merge_weight;

/* Read a counter value from gcov_value_buf array.  */

gcov_type
gcov_read_counter_mem (void)
{
  gcov_type ret;
  gcc_assert (gcov_value_buf_pos < gcov_value_buf_size);
  ret = *(gcov_value_buf + gcov_value_buf_pos);
  ++gcov_value_buf_pos;
  return ret;
}

/* Return the recorded merge weight.  */

unsigned
gcov_get_merge_weight (void)
{
  return gcov_merge_weight;
}

/* A wrapper function for merge functions. It sets up the
   value buffer and weights and then calls the merge function.  */

static void
merge_wrapper (gcov_merge_fn f, gcov_type *v1, gcov_unsigned_t n,
               gcov_type *v2, unsigned w)
{
  gcov_value_buf = v2;
  gcov_value_buf_pos = 0;
  gcov_value_buf_size = n;
  gcov_merge_weight = w;
  (*f) (v1, n);
}

/* Offline tool to manipulate profile data.
   This tool targets on matched profiles. But it has some tolerance on
   unmatched profiles.
   When merging p1 to p2 (p2 is the dst),
   * m.gcda in p1 but not in p2: append m.gcda to p2 with specified weight;
     emit warning
   * m.gcda in p2 but not in p1: keep m.gcda in p2 and multiply by
     specified weight; emit warning.
   * m.gcda in both p1 and p2:
   ** p1->m.gcda->f checksum matches p2->m.gcda->f: simple merge.
   ** p1->m.gcda->f checksum does not matches p2->m.gcda->f: keep
      p2->m.gcda->f and
      drop p1->m.gcda->f. A warning is emitted.  */

/* Add INFO2's counter to INFO1, multiplying by weight W.  */

static int
gcov_merge (struct gcov_info *info1, struct gcov_info *info2, int w)
{
  unsigned f_ix;
  unsigned n_functions = info1->n_functions;
  int has_mismatch = 0;

  gcc_assert (info2->n_functions == n_functions);
  for (f_ix = 0; f_ix < n_functions; f_ix++)
    {
      unsigned t_ix;
      const struct gcov_fn_info *gfi_ptr1 = info1->functions[f_ix];
      const struct gcov_fn_info *gfi_ptr2 = info2->functions[f_ix];
      const struct gcov_ctr_info *ci_ptr1, *ci_ptr2;

      if (!gfi_ptr1 || gfi_ptr1->key != info1)
        continue;
      if (!gfi_ptr2 || gfi_ptr2->key != info2)
        continue;

      if (gfi_ptr1->cfg_checksum != gfi_ptr2->cfg_checksum)
        {
          fnotice (stderr, "in %s, cfg_checksum mismatch, skipping\n",
                  info1->filename);
          has_mismatch = 1;
          continue;
        }
      ci_ptr1 = gfi_ptr1->ctrs;
      ci_ptr2 = gfi_ptr2->ctrs;
      for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
        {
          gcov_merge_fn merge1 = info1->merge[t_ix];
          gcov_merge_fn merge2 = info2->merge[t_ix];

          gcc_assert (merge1 == merge2);
          if (!merge1)
            continue;
          gcc_assert (ci_ptr1->num == ci_ptr2->num);
          merge_wrapper (merge1, ci_ptr1->values, ci_ptr1->num, ci_ptr2->values, w);
          ci_ptr1++;
          ci_ptr2++;
        }
    }

  return has_mismatch;
}

/* Find and return the match gcov_info object for INFO from ARRAY.
   SIZE is the length of ARRAY.
   Return NULL if there is no match.  */

static struct gcov_info *
find_match_gcov_info (struct gcov_info **array, int size,
		      struct gcov_info *info)
{
  struct gcov_info *gi_ptr;
  struct gcov_info *ret = NULL;
  int i;

  for (i = 0; i < size; i++)
    {
      gi_ptr = array[i];
      if (gi_ptr == 0)
        continue;
      if (!strcmp (gi_ptr->filename, info->filename))
        {
          ret = gi_ptr;
          array[i] = 0;
          break;
        }
    }

  if (ret && ret->n_functions != info->n_functions)
    {
      fnotice (stderr, "mismatched profiles in %s (%d functions"
                       " vs %d functions)\n",
                       ret->filename,
                       ret->n_functions,
                       info->n_functions);
      ret = NULL;
    }
  return ret;
}

/* Merge the list of gcov_info objects from SRC_PROFILE to TGT_PROFILE.
   Return 0 on success: without mismatch.
   Reutrn 1 on error.  */

int
gcov_profile_merge (struct gcov_info *tgt_profile, struct gcov_info *src_profile,
                    int w1, int w2)
{
  struct gcov_info *gi_ptr;
  struct gcov_info **tgt_infos;
  struct gcov_info *tgt_tail;
  struct gcov_info **in_src_not_tgt;
  unsigned tgt_cnt = 0, src_cnt = 0;
  unsigned unmatch_info_cnt = 0;
  unsigned int i;

  for (gi_ptr = tgt_profile; gi_ptr; gi_ptr = gi_ptr->next)
    tgt_cnt++;
  for (gi_ptr = src_profile; gi_ptr; gi_ptr = gi_ptr->next)
    src_cnt++;
  tgt_infos = (struct gcov_info **) xmalloc (sizeof (struct gcov_info *)
                 * tgt_cnt);
  gcc_assert (tgt_infos);
  in_src_not_tgt = (struct gcov_info **) xmalloc (sizeof (struct gcov_info *)
                     * src_cnt);
  gcc_assert (in_src_not_tgt);

  for (gi_ptr = tgt_profile, i = 0; gi_ptr; gi_ptr = gi_ptr->next, i++)
    tgt_infos[i] = gi_ptr;

  tgt_tail = tgt_infos[tgt_cnt - 1];

  /* First pass on tgt_profile, we multiply w1 to all counters.  */
  if (w1 > 1)
    {
       for (i = 0; i < tgt_cnt; i++)
         gcov_merge (tgt_infos[i], tgt_infos[i], w1-1);
    }

  /* Second pass, add src_profile to the tgt_profile.  */
  for (gi_ptr = src_profile; gi_ptr; gi_ptr = gi_ptr->next)
    {
      struct gcov_info *gi_ptr1;

      gi_ptr1 = find_match_gcov_info (tgt_infos, tgt_cnt, gi_ptr);
      if (gi_ptr1 == NULL)
        {
          in_src_not_tgt[unmatch_info_cnt++] = gi_ptr;
          continue;
        }
      gcov_merge (gi_ptr1, gi_ptr, w2);
    }

  /* For modules in src but not in tgt. We adjust the counter and append.  */
  for (i = 0; i < unmatch_info_cnt; i++)
    {
      gi_ptr = in_src_not_tgt[i];
      gcov_merge (gi_ptr, gi_ptr, w2 - 1);
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      gi_ptr->next = NULL;
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      tgt_tail->next = gi_ptr;
      tgt_tail = gi_ptr;
    }

  return 0;
}

typedef gcov_type (*counter_op_fn) (gcov_type, void*, void*);

/* Performing FN upon arc counters.  */

static void
__gcov_add_counter_op (gcov_type *counters, unsigned n_counters,
                       counter_op_fn fn, void *data1, void *data2)
{
  for (; n_counters; counters++, n_counters--)
    {
      gcov_type val = *counters;
      *counters = fn(val, data1, data2);
    }
}

/* Performing FN upon ior counters.  */

static void
__gcov_ior_counter_op (gcov_type *counters ATTRIBUTE_UNUSED,
                       unsigned n_counters ATTRIBUTE_UNUSED,
                       counter_op_fn fn ATTRIBUTE_UNUSED,
                       void *data1 ATTRIBUTE_UNUSED,
                       void *data2 ATTRIBUTE_UNUSED)
{
  /* Do nothing.  */
}

/* Performing FN upon time-profile counters.  */

static void
__gcov_time_profile_counter_op (gcov_type *counters ATTRIBUTE_UNUSED,
                                unsigned n_counters ATTRIBUTE_UNUSED,
                                counter_op_fn fn ATTRIBUTE_UNUSED,
                                void *data1 ATTRIBUTE_UNUSED,
                                void *data2 ATTRIBUTE_UNUSED)
{
  /* Do nothing.  */
}

/* Performing FN upon single counters.  */

static void
__gcov_single_counter_op (gcov_type *counters, unsigned n_counters,
                          counter_op_fn fn, void *data1, void *data2)
{
  unsigned i, n_measures;

  gcc_assert (!(n_counters % 3));
  n_measures = n_counters / 3;
  for (i = 0; i < n_measures; i++, counters += 3)
    {
      counters[1] = fn (counters[1], data1, data2);
      counters[2] = fn (counters[2], data1, data2);
    }
}

/* Performing FN upon indirect-call profile counters.  */

static void
__gcov_icall_topn_counter_op (gcov_type *counters, unsigned n_counters,
                              counter_op_fn fn, void *data1, void *data2)
{
  unsigned i;

  gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS));
  for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS)
    {
      unsigned j;
      gcov_type *value_array = &counters[i + 1];

      for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2)
        value_array[j + 1] = fn (value_array[j + 1], data1, data2);
    }
}

/* Scaling the counter value V by multiplying *(float*) DATA1.  */

static gcov_type
fp_scale (gcov_type v, void *data1, void *data2 ATTRIBUTE_UNUSED)
{
  float f = *(float *) data1;
  return (gcov_type) (v * f);
}

/* Scaling the counter value V by multiplying DATA2/DATA1.  */

static gcov_type
int_scale (gcov_type v, void *data1, void *data2)
{
  int n = *(int *) data1;
  int d = *(int *) data2;
  return (gcov_type) ( RDIV (v,d) * n);
}

/* Type of function used to process counters.  */
typedef void (*gcov_counter_fn) (gcov_type *, gcov_unsigned_t,
                          counter_op_fn, void *, void *);

/* Function array to process profile counters.  */
#define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) \
  __gcov ## FN_TYPE ## _counter_op,
static gcov_counter_fn ctr_functions[GCOV_COUNTERS] = {
#include "gcov-counter.def"
};
#undef DEF_GCOV_COUNTER

/* Driver for scaling profile counters.  */

int
gcov_profile_scale (struct gcov_info *profile, float scale_factor, int n, int d)
{
  struct gcov_info *gi_ptr;
  unsigned f_ix;

  if (verbose)
    fnotice (stdout, "scale_factor is %f or %d/%d\n", scale_factor, n, d);

  /* Scaling the counters.  */
  for (gi_ptr = profile; gi_ptr; gi_ptr = gi_ptr->next)
    for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)
      {
        unsigned t_ix;
        const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
        const struct gcov_ctr_info *ci_ptr;

        if (!gfi_ptr || gfi_ptr->key != gi_ptr)
          continue;

        ci_ptr = gfi_ptr->ctrs;
        for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
          {
            gcov_merge_fn merge = gi_ptr->merge[t_ix];

            if (!merge)
              continue;
            if (d == 0)
              (*ctr_functions[t_ix]) (ci_ptr->values, ci_ptr->num,
                                      fp_scale, &scale_factor, NULL);
            else
              (*ctr_functions[t_ix]) (ci_ptr->values, ci_ptr->num,
                                      int_scale, &n, &d);
            ci_ptr++;
          }
      }

  return 0;
}

/* Driver to normalize profile counters.  */

int
gcov_profile_normalize (struct gcov_info *profile, gcov_type max_val)
{
  struct gcov_info *gi_ptr;
  gcov_type curr_max_val = 0;
  unsigned f_ix;
  unsigned int i;
  float scale_factor;

  /* Find the largest count value.  */
  for (gi_ptr = profile; gi_ptr; gi_ptr = gi_ptr->next)
    for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++)
      {
        unsigned t_ix;
        const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
        const struct gcov_ctr_info *ci_ptr;

        if (!gfi_ptr || gfi_ptr->key != gi_ptr)
          continue;

        ci_ptr = gfi_ptr->ctrs;
        for (t_ix = 0; t_ix < 1; t_ix++)
          {
            for (i = 0; i < ci_ptr->num; i++)
              if (ci_ptr->values[i] > curr_max_val)
                curr_max_val = ci_ptr->values[i];
            ci_ptr++;
          }
      }

  scale_factor = (float)max_val / curr_max_val;
  if (verbose)
866
    fnotice (stdout, "max_val is %" PRId64 "\n", curr_max_val);
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360

  return gcov_profile_scale (profile, scale_factor, 0, 0);
}

/* The following variables are defined in gcc/gcov-tool.c.  */
extern int overlap_func_level;
extern int overlap_obj_level;
extern int overlap_hot_only;
extern int overlap_use_fullname;
extern double overlap_hot_threshold;

/* Compute the overlap score of two values. The score is defined as:
    min (V1/SUM_1, V2/SUM_2)  */

static double
calculate_2_entries (const unsigned long v1, const unsigned long v2,
                     const double sum_1, const double sum_2)
{
  double val1 = (sum_1 == 0.0 ? 0.0 : v1/sum_1);
  double val2 = (sum_2 == 0.0 ? 0.0 : v2/sum_2);

  if (val2 < val1)
    val1 = val2;

  return val1;
}

/*  Compute the overlap score between GCOV_INFO1 and GCOV_INFO2.
    SUM_1 is the sum_all for profile1 where GCOV_INFO1 belongs.
    SUM_2 is the sum_all for profile2 where GCOV_INFO2 belongs.
    This function also updates cumulative score CUM_1_RESULT and
    CUM_2_RESULT.  */

static double
compute_one_gcov (const struct gcov_info *gcov_info1,
                  const struct gcov_info *gcov_info2,
                  const double sum_1, const double sum_2,
                  double *cum_1_result, double *cum_2_result)
{
  unsigned f_ix;
  double ret = 0;
  double cum_1 = 0, cum_2 = 0;
  const struct gcov_info *gcov_info = 0;
  double *cum_p;
  double sum;

  gcc_assert (gcov_info1 || gcov_info2);
  if (!gcov_info1)
    {
      gcov_info = gcov_info2;
      cum_p = cum_2_result;
      sum = sum_2;
      *cum_1_result = 0;
    } else
  if (!gcov_info2)
    {
      gcov_info = gcov_info1;
      cum_p = cum_1_result;
      sum = sum_1;
      *cum_2_result = 0;
    }

  if (gcov_info)
  {
    for (f_ix = 0; f_ix < gcov_info->n_functions; f_ix++)
      {
        unsigned t_ix;
        const struct gcov_fn_info *gfi_ptr = gcov_info->functions[f_ix];
        if (!gfi_ptr || gfi_ptr->key != gcov_info)
          continue;
        const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
        for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)
          {
            unsigned c_num;

            if (!gcov_info->merge[t_ix])
              continue;

            for (c_num = 0; c_num < ci_ptr->num; c_num++)
              {
                cum_1 += ci_ptr->values[c_num] / sum;
              }
            ci_ptr++;
          }
      }
    *cum_p = cum_1;
    return 0.0;
  }

  for (f_ix = 0; f_ix < gcov_info1->n_functions; f_ix++)
    {
      unsigned t_ix;
      double func_cum_1 = 0.0;
      double func_cum_2 = 0.0;
      double func_val = 0.0;
      int nonzero = 0;
      int hot = 0;
      const struct gcov_fn_info *gfi_ptr1 = gcov_info1->functions[f_ix];
      const struct gcov_fn_info *gfi_ptr2 = gcov_info2->functions[f_ix];

      if (!gfi_ptr1 || gfi_ptr1->key != gcov_info1)
        continue;
      if (!gfi_ptr2 || gfi_ptr2->key != gcov_info2)
        continue;

      const struct gcov_ctr_info *ci_ptr1 = gfi_ptr1->ctrs;
      const struct gcov_ctr_info *ci_ptr2 = gfi_ptr2->ctrs;
      for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)
        {
          unsigned c_num;

          if (!gcov_info1->merge[t_ix])
            continue;

          for (c_num = 0; c_num < ci_ptr1->num; c_num++)
            {
              if (ci_ptr1->values[c_num] | ci_ptr2->values[c_num])
                {
                  func_val += calculate_2_entries (ci_ptr1->values[c_num],
                                          ci_ptr2->values[c_num],
                                          sum_1, sum_2);

                  func_cum_1 += ci_ptr1->values[c_num] / sum_1;
                  func_cum_2 += ci_ptr2->values[c_num] / sum_2;
                  nonzero = 1;
                  if (ci_ptr1->values[c_num] / sum_1 >= overlap_hot_threshold ||
                      ci_ptr2->values[c_num] / sum_2 >= overlap_hot_threshold)
                    hot = 1;
                }
            }
          ci_ptr1++;
          ci_ptr2++;
        }
      ret += func_val;
      cum_1 += func_cum_1;
      cum_2 += func_cum_2;
      if (overlap_func_level && nonzero && (!overlap_hot_only || hot))
        {
          printf("   \tfunc_id=%10d \toverlap =%6.5f%% (%5.5f%% %5.5f%%)\n",
                 gfi_ptr1->ident, func_val*100, func_cum_1*100, func_cum_2*100);
        }
    }
  *cum_1_result = cum_1;
  *cum_2_result = cum_2;
  return ret;
}

/* Test if all counter values in this GCOV_INFO are cold.
   "Cold" is defined as the counter value being less than
   or equal to THRESHOLD.  */

static bool
gcov_info_count_all_cold (const struct gcov_info *gcov_info,
                          gcov_type threshold)
{
  unsigned f_ix;

  for (f_ix = 0; f_ix < gcov_info->n_functions; f_ix++)
    {
      unsigned t_ix;
      const struct gcov_fn_info *gfi_ptr = gcov_info->functions[f_ix];

      if (!gfi_ptr || gfi_ptr->key != gcov_info)
        continue;
      const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
      for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)
        {
          unsigned c_num;

          if (!gcov_info->merge[t_ix])
            continue;

          for (c_num = 0; c_num < ci_ptr->num; c_num++)
            {
              if (ci_ptr->values[c_num] > threshold)
                return false;
            }
          ci_ptr++;
        }
    }

  return true;
}

/* Test if all counter values in this GCOV_INFO are 0.  */

static bool
gcov_info_count_all_zero (const struct gcov_info *gcov_info)
{
  return gcov_info_count_all_cold (gcov_info, 0);
}

/* A pair of matched GCOV_INFO.
   The flag is a bitvector:
     b0: obj1's all counts are 0;
     b1: obj1's all counts are cold (but no 0);
     b2: obj1 is hot;
     b3: no obj1 to match obj2;
     b4: obj2's all counts are 0;
     b5: obj2's all counts are cold (but no 0);
     b6: obj2 is hot;
     b7: no obj2 to match obj1;
 */
struct overlap_t {
   const struct gcov_info *obj1;
   const struct gcov_info *obj2;
   char flag;
};

#define FLAG_BOTH_ZERO(flag) ((flag & 0x1) && (flag & 0x10))
#define FLAG_BOTH_COLD(flag) ((flag & 0x2) && (flag & 0x20))
#define FLAG_ONE_HOT(flag) ((flag & 0x4) || (flag & 0x40))

/* Cumlative overlap dscore for profile1 and profile2.  */
static double overlap_sum_1, overlap_sum_2;

/* sum_all for profile1 and profile2.  */
static gcov_type p1_sum_all, p2_sum_all;

/* run_max for profile1 and profile2.  */
static gcov_type p1_run_max, p2_run_max;

/* The number of gcda files in the profiles.  */
static unsigned gcda_files[2];

/* The number of unique gcda files in the profiles
   (not existing in the other profile).  */
static unsigned unique_gcda_files[2];

/* The number of gcda files that all counter values are 0.  */
static unsigned zero_gcda_files[2];

/* The number of gcda files that all counter values are cold (but not 0).  */
static unsigned cold_gcda_files[2];

/* The number of gcda files that includes hot counter values.  */
static unsigned hot_gcda_files[2];

/* The number of gcda files with hot count value in either profiles.  */
static unsigned both_hot_cnt;

/* The number of gcda files with all counts cold (but not 0) in
   both profiles. */
static unsigned both_cold_cnt;

/* The number of gcda files with all counts 0 in both profiles.  */
static unsigned both_zero_cnt;

/* Extract the basename of the filename NAME.  */

static char *
extract_file_basename (const char *name)
{
  char *str;
  int len = 0;
  char *path = xstrdup (name);
  char sep_str[2];

  sep_str[0] = DIR_SEPARATOR;
  sep_str[1] = 0;
  str = strstr(path, sep_str);
  do{
      len = strlen(str) + 1;
      path = &path[strlen(path) - len + 2];
      str = strstr(path, sep_str);
  } while(str);

  return path;
}

/* Utility function to get the filename.  */

static const char *
get_file_basename (const char *name)
{
  if (overlap_use_fullname)
    return name;
  return extract_file_basename (name);
}

/* A utility function to set the flag for the gcda files.  */

static void
set_flag (struct overlap_t *e)
{
  char flag = 0;

  if (!e->obj1)
    {
      unique_gcda_files[1]++;
      flag = 0x8;
    }
  else
    {
      gcda_files[0]++;
      if (gcov_info_count_all_zero (e->obj1))
        {
          zero_gcda_files[0]++;
          flag = 0x1;
        }
      else
      if (gcov_info_count_all_cold (e->obj1, overlap_sum_1
			      * overlap_hot_threshold))
        {
          cold_gcda_files[0]++;
          flag = 0x2;
        }
      else
        {
          hot_gcda_files[0]++;
          flag = 0x4;
        }
    }

  if (!e->obj2)
    {
      unique_gcda_files[0]++;
      flag |= (0x8 << 4);
    }
  else
    {
      gcda_files[1]++;
      if (gcov_info_count_all_zero (e->obj2))
        {
          zero_gcda_files[1]++;
          flag |= (0x1 << 4);
        }
      else
      if (gcov_info_count_all_cold (e->obj2, overlap_sum_2
			      * overlap_hot_threshold))
        {
          cold_gcda_files[1]++;
          flag |= (0x2 << 4);
        }
      else
        {
          hot_gcda_files[1]++;
          flag |= (0x4 << 4);
        }
    }

  gcc_assert (flag);
  e->flag = flag;
}

/* Test if INFO1 and INFO2 are from the matched source file.
   Return 1 if they match; return 0 otherwise.  */

static int
matched_gcov_info (const struct gcov_info *info1, const struct gcov_info *info2)
{
  /* For FDO, we have to match the name. This can be expensive.
     Maybe we should use hash here.  */
  if (strcmp (info1->filename, info2->filename))
    return 0;

  if (info1->n_functions != info2->n_functions)
    {
      fnotice (stderr, "mismatched profiles in %s (%d functions"
                       " vs %d functions)\n",
                       info1->filename,
                       info1->n_functions,
                       info2->n_functions);
      return 0;
    }
  return 1;
}

/* Defined in libgcov-driver.c.  */
extern gcov_unsigned_t compute_summary (struct gcov_info *,
                 struct gcov_summary *, size_t *);

/* Compute the overlap score of two profiles with the head of GCOV_LIST1 and
   GCOV_LIST1. Return a number ranging from [0.0, 1.0], with 0.0 meaning no
   match and 1.0 meaning a perfect match.  */

static double
calculate_overlap (struct gcov_info *gcov_list1,
                   struct gcov_info *gcov_list2)
{
  struct gcov_summary this_prg;
  unsigned list1_cnt = 0, list2_cnt= 0, all_cnt;
  unsigned int i, j;
  size_t max_length;
  const struct gcov_info *gi_ptr;
  struct overlap_t *all_infos;

  compute_summary (gcov_list1, &this_prg, &max_length);
  overlap_sum_1 = (double) (this_prg.ctrs[0].sum_all);
  p1_sum_all = this_prg.ctrs[0].sum_all;
  p1_run_max = this_prg.ctrs[0].run_max;
  compute_summary (gcov_list2, &this_prg, &max_length);
  overlap_sum_2 = (double) (this_prg.ctrs[0].sum_all);
  p2_sum_all = this_prg.ctrs[0].sum_all;
  p2_run_max = this_prg.ctrs[0].run_max;

  for (gi_ptr = gcov_list1; gi_ptr; gi_ptr = gi_ptr->next)
    list1_cnt++;
  for (gi_ptr = gcov_list2; gi_ptr; gi_ptr = gi_ptr->next)
    list2_cnt++;
  all_cnt = list1_cnt + list2_cnt;
  all_infos = (struct overlap_t *) xmalloc (sizeof (struct overlap_t)
               * all_cnt * 2);
  gcc_assert (all_infos);

  i = 0;
  for (gi_ptr = gcov_list1; gi_ptr; gi_ptr = gi_ptr->next, i++)
    {
      all_infos[i].obj1 = gi_ptr;
      all_infos[i].obj2 = 0;
    }

  for (gi_ptr = gcov_list2; gi_ptr; gi_ptr = gi_ptr->next, i++)
    {
      all_infos[i].obj1 = 0;
      all_infos[i].obj2 = gi_ptr;
    }

  for (i = list1_cnt; i < all_cnt; i++)
    {
      if (all_infos[i].obj2 == 0)
        continue;
      for (j = 0; j < list1_cnt; j++)
        {
          if (all_infos[j].obj2 != 0)
            continue;
          if (matched_gcov_info (all_infos[i].obj2, all_infos[j].obj1))
            {
              all_infos[j].obj2 = all_infos[i].obj2;
              all_infos[i].obj2 = 0;
              break;
            }
        }
    }

  for (i = 0; i < all_cnt; i++)
    if (all_infos[i].obj1 || all_infos[i].obj2)
      {
        set_flag (all_infos + i);
        if (FLAG_ONE_HOT (all_infos[i].flag))
            both_hot_cnt++;
        if (FLAG_BOTH_COLD(all_infos[i].flag))
            both_cold_cnt++;
        if (FLAG_BOTH_ZERO(all_infos[i].flag))
            both_zero_cnt++;
      }

  double prg_val = 0;
  double sum_val = 0;
  double sum_cum_1 = 0;
  double sum_cum_2 = 0;

  for (i = 0; i < all_cnt; i++)
    {
      double val;
      double cum_1, cum_2;
      const char *filename;

      if (all_infos[i].obj1 == 0 && all_infos[i].obj2 == 0)
        continue;
      if (FLAG_BOTH_ZERO (all_infos[i].flag))
          continue;

      if (all_infos[i].obj1)
        filename = get_file_basename (all_infos[i].obj1->filename);
      else
        filename = get_file_basename (all_infos[i].obj2->filename);

      if (overlap_func_level)
        printf("\n   processing %36s:\n", filename);

      val = compute_one_gcov (all_infos[i].obj1, all_infos[i].obj2,
          overlap_sum_1, overlap_sum_2, &cum_1, &cum_2);

      if (overlap_obj_level && (!overlap_hot_only || FLAG_ONE_HOT (all_infos[i].flag)))
        {
          printf("   obj=%36s  overlap = %6.2f%% (%5.2f%% %5.2f%%)\n",
                  filename, val*100, cum_1*100, cum_2*100);
          sum_val += val;
          sum_cum_1 += cum_1;
          sum_cum_2 += cum_2;
        }

      prg_val += val;

    }

  if (overlap_obj_level)
    printf("   SUM:%36s  overlap = %6.2f%% (%5.2f%% %5.2f%%)\n",
           "", sum_val*100, sum_cum_1*100, sum_cum_2*100);

  printf ("  Statistics:\n"
          "                    profile1_#     profile2_#       overlap_#\n");
  printf ("    gcda files:  %12u\t%12u\t%12u\n", gcda_files[0], gcda_files[1],
1361
	  gcda_files[0]-unique_gcda_files[0]);
1362
  printf ("  unique files:  %12u\t%12u\n", unique_gcda_files[0],
1363
	  unique_gcda_files[1]);
1364
  printf ("     hot files:  %12u\t%12u\t%12u\n", hot_gcda_files[0],
1365
	  hot_gcda_files[1], both_hot_cnt);
1366
  printf ("    cold files:  %12u\t%12u\t%12u\n", cold_gcda_files[0],
1367
	  cold_gcda_files[1], both_cold_cnt);
1368
  printf ("    zero files:  %12u\t%12u\t%12u\n", zero_gcda_files[0],
1369 1370 1371 1372 1373
	  zero_gcda_files[1], both_zero_cnt);
  printf ("       sum_all:  %12" PRId64 "\t%12" PRId64 "\n",
	  p1_sum_all, p2_sum_all);
  printf ("       run_max:  %12" PRId64 "\t%12" PRId64 "\n",
	  p1_run_max, p2_run_max);
1374 1375 1376 1377

  return prg_val;
}

1378 1379
/* Compute the overlap score of two lists of gcov_info objects PROFILE1 and
   PROFILE2.
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   Return 0 on success: without mismatch. Reutrn 1 on error.  */

int
gcov_profile_overlap (struct gcov_info *profile1, struct gcov_info *profile2)
{
  double result;

  result = calculate_overlap (profile1, profile2);

  if (result > 0)
    {
      printf("\nProgram level overlap result is %3.2f%%\n\n", result*100);
      return 0;
    }
  return 1;
}