Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 870 insertions, 0 deletions

diff --git a/gcc-4.9/libgcc/libgcov-driver.c b/gcc-4.9/libgcc/libgcov-driver.c
new file mode 100644
index 000000000..f8abdb1e8
--- /dev/null
+++ b/gcc-4.9/libgcc/libgcov-driver.c
@@ -0,0 +1,870 @@
+/* Routines required for instrumenting a program.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1989-2014 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 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/>.  */
+
+#include "libgcov.h"
+
+#if defined(inhibit_libc)
+/* If libc and its header files are not available, provide dummy functions.  */
+
+#if defined(L_gcov)
+void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}
+#endif
+
+#else /* inhibit_libc */
+
+#include <string.h>
+#if GCOV_LOCKED
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/stat.h>
+#endif
+
+#ifdef L_gcov
+#include "gcov-io.c"
+
+/* The following functions can be called from outside of this file.  */
+extern void gcov_clear (void) ATTRIBUTE_HIDDEN;
+extern void gcov_exit (void) ATTRIBUTE_HIDDEN;
+extern void set_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
+extern void reset_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
+extern int get_gcov_dump_complete (void) ATTRIBUTE_HIDDEN;
+extern void set_gcov_list (struct gcov_info *) ATTRIBUTE_HIDDEN;
+
+struct gcov_fn_buffer
+{
+  struct gcov_fn_buffer *next;
+  unsigned fn_ix;
+  struct gcov_fn_info info;
+  /* note gcov_fn_info ends in a trailing array.  */
+};
+
+struct gcov_summary_buffer
+{
+  struct gcov_summary_buffer *next;
+  struct gcov_summary summary;
+};
+
+/* Chain of per-object gcov structures.  */
+static struct gcov_info *gcov_list;
+
+/* Set the head of gcov_list.  */
+void
+set_gcov_list (struct gcov_info *head)
+{
+  gcov_list = head;
+}
+
+/* Size of the longest file name. */
+static size_t gcov_max_filename = 0;
+
+/* Flag when the profile has already been dumped via __gcov_dump().  */
+static int gcov_dump_complete;
+
+/* A global function that get the vaule of gcov_dump_complete.  */
+
+int
+get_gcov_dump_complete (void)
+{
+  return gcov_dump_complete;
+}
+
+/* A global functino that set the vaule of gcov_dump_complete. Will
+   be used in __gcov_dump() in libgcov-interface.c.  */
+
+void
+set_gcov_dump_complete (void)
+{
+  gcov_dump_complete = 1;
+}
+
+/* A global functino that set the vaule of gcov_dump_complete. Will
+   be used in __gcov_reset() in libgcov-interface.c.  */
+
+void
+reset_gcov_dump_complete (void)
+{
+  gcov_dump_complete = 0;
+}
+
+/* A utility function for outputing errors.  */
+static int gcov_error (const char *, ...);
+
+static struct gcov_fn_buffer *
+free_fn_data (const struct gcov_info *gi_ptr, struct gcov_fn_buffer *buffer,
+              unsigned limit)
+{
+  struct gcov_fn_buffer *next;
+  unsigned ix, n_ctr = 0;
+
+  if (!buffer)
+    return 0;
+  next = buffer->next;
+
+  for (ix = 0; ix != limit; ix++)
+    if (gi_ptr->merge[ix])
+      free (buffer->info.ctrs[n_ctr++].values);
+  free (buffer);
+  return next;
+}
+
+static struct gcov_fn_buffer **
+buffer_fn_data (const char *filename, const struct gcov_info *gi_ptr,
+                struct gcov_fn_buffer **end_ptr, unsigned fn_ix)
+{
+  unsigned n_ctrs = 0, ix = 0;
+  struct gcov_fn_buffer *fn_buffer;
+  unsigned len;
+
+  for (ix = GCOV_COUNTERS; ix--;)
+    if (gi_ptr->merge[ix])
+      n_ctrs++;
+
+  len = sizeof (*fn_buffer) + sizeof (fn_buffer->info.ctrs[0]) * n_ctrs;
+  fn_buffer = (struct gcov_fn_buffer *) xmalloc (len);
+
+  if (!fn_buffer)
+    goto fail;
+
+  fn_buffer->next = 0;
+  fn_buffer->fn_ix = fn_ix;
+  fn_buffer->info.ident = gcov_read_unsigned ();
+  fn_buffer->info.lineno_checksum = gcov_read_unsigned ();
+  fn_buffer->info.cfg_checksum = gcov_read_unsigned ();
+
+  for (n_ctrs = ix = 0; ix != GCOV_COUNTERS; ix++)
+    {
+      gcov_unsigned_t length;
+      gcov_type *values;
+
+      if (!gi_ptr->merge[ix])
+        continue;
+
+      if (gcov_read_unsigned () != GCOV_TAG_FOR_COUNTER (ix))
+        {
+          len = 0;
+          goto fail;
+        }
+
+      length = GCOV_TAG_COUNTER_NUM (gcov_read_unsigned ());
+      len = length * sizeof (gcov_type);
+      values = (gcov_type *) xmalloc (len);
+      if (!values)
+        goto fail;
+
+      fn_buffer->info.ctrs[n_ctrs].num = length;
+      fn_buffer->info.ctrs[n_ctrs].values = values;
+
+      while (length--)
+        *values++ = gcov_read_counter ();
+      n_ctrs++;
+    }
+
+  *end_ptr = fn_buffer;
+  return &fn_buffer->next;
+
+fail:
+  gcov_error ("profiling:%s:Function %u %s %u \n", filename, fn_ix,
+              len ? "cannot allocate" : "counter mismatch", len ? len : ix);
+
+  return (struct gcov_fn_buffer **)free_fn_data (gi_ptr, fn_buffer, ix);
+}
+
+/* Add an unsigned value to the current crc */
+
+static gcov_unsigned_t
+crc32_unsigned (gcov_unsigned_t crc32, gcov_unsigned_t value)
+{
+  unsigned ix;
+
+  for (ix = 32; ix--; value <<= 1)
+    {
+      unsigned feedback;
+
+      feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0;
+      crc32 <<= 1;
+      crc32 ^= feedback;
+    }
+
+  return crc32;
+}
+
+/* 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);
+
+      gcov_error ("profiling:%s:Version mismatch - expected %.4s got %.4s\n",
+                  filename? filename : ptr->filename, e, v);
+      return 0;
+    }
+  return 1;
+}
+
+/* Insert counter VALUE into HISTOGRAM.  */
+
+static void
+gcov_histogram_insert(gcov_bucket_type *histogram, gcov_type value)
+{
+  unsigned i;
+
+  i = gcov_histo_index(value);
+  histogram[i].num_counters++;
+  histogram[i].cum_value += value;
+  if (value < histogram[i].min_value)
+    histogram[i].min_value = value;
+}
+
+/* Computes a histogram of the arc counters to place in the summary SUM.  */
+
+static void
+gcov_compute_histogram (struct gcov_summary *sum)
+{
+  struct gcov_info *gi_ptr;
+  const struct gcov_fn_info *gfi_ptr;
+  const struct gcov_ctr_info *ci_ptr;
+  struct gcov_ctr_summary *cs_ptr;
+  unsigned t_ix, f_ix, ctr_info_ix, ix;
+  int h_ix;
+
+  /* This currently only applies to arc counters.  */
+  t_ix = GCOV_COUNTER_ARCS;
+
+  /* First check if there are any counts recorded for this counter.  */
+  cs_ptr = &(sum->ctrs[t_ix]);
+  if (!cs_ptr->num)
+    return;
+
+  for (h_ix = 0; h_ix < GCOV_HISTOGRAM_SIZE; h_ix++)
+    {
+      cs_ptr->histogram[h_ix].num_counters = 0;
+      cs_ptr->histogram[h_ix].min_value = cs_ptr->run_max;
+      cs_ptr->histogram[h_ix].cum_value = 0;
+    }
+
+  /* Walk through all the per-object structures and record each of
+     the count values in histogram.  */
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    {
+      if (!gi_ptr->merge[t_ix])
+        continue;
+
+      /* Find the appropriate index into the gcov_ctr_info array
+         for the counter we are currently working on based on the
+         existence of the merge function pointer for this object.  */
+      for (ix = 0, ctr_info_ix = 0; ix < t_ix; ix++)
+        {
+          if (gi_ptr->merge[ix])
+            ctr_info_ix++;
+        }
+      for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++)
+        {
+          gfi_ptr = gi_ptr->functions[f_ix];
+
+          if (!gfi_ptr || gfi_ptr->key != gi_ptr)
+            continue;
+
+          ci_ptr = &gfi_ptr->ctrs[ctr_info_ix];
+          for (ix = 0; ix < ci_ptr->num; ix++)
+            gcov_histogram_insert (cs_ptr->histogram, ci_ptr->values[ix]);
+        }
+    }
+}
+
+/* gcda filename.  */
+static char *gi_filename;
+/* buffer for the fn_data from another program.  */
+static struct gcov_fn_buffer *fn_buffer;
+/* buffer for summary from other programs to be written out. */
+static struct gcov_summary_buffer *sum_buffer;
+/* If application calls fork or exec multiple times, we end up storing
+   profile repeadely.  We should not account this as multiple runs or
+   functions executed once may mistakely become cold.  */
+static int run_accounted = 0;
+
+/* This funtions computes the program level summary and the histo-gram.
+   It computes and returns CRC32 and stored summary in THIS_PRG.  */
+
+static gcov_unsigned_t
+gcov_exit_compute_summary (struct gcov_summary *this_prg)
+{
+  struct gcov_info *gi_ptr;
+  const struct gcov_fn_info *gfi_ptr;
+  struct gcov_ctr_summary *cs_ptr;
+  const struct gcov_ctr_info *ci_ptr;
+  int f_ix;
+  unsigned t_ix;
+  gcov_unsigned_t c_num;
+  gcov_unsigned_t crc32 = 0;
+
+  /* Find the totals for this execution.  */
+  memset (this_prg, 0, sizeof (*this_prg));
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    {
+      crc32 = crc32_unsigned (crc32, gi_ptr->stamp);
+      crc32 = crc32_unsigned (crc32, gi_ptr->n_functions);
+
+      for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
+        {
+          gfi_ptr = gi_ptr->functions[f_ix];
+
+          if (gfi_ptr && gfi_ptr->key != gi_ptr)
+            gfi_ptr = 0;
+
+          crc32 = crc32_unsigned (crc32, gfi_ptr ? gfi_ptr->cfg_checksum : 0);
+          crc32 = crc32_unsigned (crc32,
+                                  gfi_ptr ? gfi_ptr->lineno_checksum : 0);
+          if (!gfi_ptr)
+            continue;
+
+          ci_ptr = gfi_ptr->ctrs;
+          for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
+            {
+              if (!gi_ptr->merge[t_ix])
+                continue;
+
+              cs_ptr = &(this_prg->ctrs[t_ix]);
+              cs_ptr->num += ci_ptr->num;
+              crc32 = crc32_unsigned (crc32, 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++;
+            }
+        }
+    }
+  gcov_compute_histogram (this_prg);
+  return crc32;
+}
+
+/* A struct that bundles all the related information about the
+   gcda filename.  */
+struct gcov_filename_aux{
+  char *gi_filename_up;
+  int gcov_prefix_strip;
+  size_t prefix_length;
+};
+
+/* Including system dependent components. */
+#include "libgcov-driver-system.c"
+
+/* This function merges counters in GI_PTR to an existing gcda file.
+   Return 0 on success.
+   Return -1 on error. In this case, caller will goto read_fatal.  */
+
+static int
+gcov_exit_merge_gcda (struct gcov_info *gi_ptr,
+                      struct gcov_summary *prg_p,
+                      struct gcov_summary *this_prg,
+                      gcov_position_t *summary_pos_p,
+                      gcov_position_t *eof_pos_p,
+		      gcov_unsigned_t crc32)
+{
+  gcov_unsigned_t tag, length;
+  unsigned t_ix;
+  int f_ix;
+  int error = 0;
+  struct gcov_fn_buffer **fn_tail = &fn_buffer;
+  struct gcov_summary_buffer **sum_tail = &sum_buffer;
+
+  length = gcov_read_unsigned ();
+  if (!gcov_version (gi_ptr, length, gi_filename))
+    return -1;
+
+  length = gcov_read_unsigned ();
+  if (length != gi_ptr->stamp)
+    /* Read from a different compilation. Overwrite the file.  */
+    return 0;
+
+  /* Look for program summary.  */
+  for (f_ix = 0;;)
+    {
+      struct gcov_summary tmp;
+
+      *eof_pos_p = gcov_position ();
+      tag = gcov_read_unsigned ();
+      if (tag != GCOV_TAG_PROGRAM_SUMMARY)
+        break;
+
+      f_ix--;
+      length = gcov_read_unsigned ();
+      gcov_read_summary (&tmp);
+      if ((error = gcov_is_error ()))
+        goto read_error;
+      if (*summary_pos_p)
+        {
+          /* Save all summaries after the one that will be
+             merged into below. These will need to be rewritten
+             as histogram merging may change the number of non-zero
+             histogram entries that will be emitted, and thus the
+             size of the merged summary.  */
+          (*sum_tail) = (struct gcov_summary_buffer *)
+              xmalloc (sizeof(struct gcov_summary_buffer));
+          (*sum_tail)->summary = tmp;
+          (*sum_tail)->next = 0;
+          sum_tail = &((*sum_tail)->next);
+          goto next_summary;
+        }
+      if (tmp.checksum != crc32)
+        goto next_summary;
+
+      for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++)
+        if (tmp.ctrs[t_ix].num != this_prg->ctrs[t_ix].num)
+          goto next_summary;
+      *prg_p = tmp;
+      *summary_pos_p = *eof_pos_p;
+
+    next_summary:;
+    }
+
+  /* Merge execution counts for each function.  */
+  for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions;
+       f_ix++, tag = gcov_read_unsigned ())
+    {
+      const struct gcov_ctr_info *ci_ptr;
+      const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
+
+      if (tag != GCOV_TAG_FUNCTION)
+        goto read_mismatch;
+
+      length = gcov_read_unsigned ();
+      if (!length)
+        /* This function did not appear in the other program.
+           We have nothing to merge.  */
+        continue;
+
+      if (length != GCOV_TAG_FUNCTION_LENGTH)
+        goto read_mismatch;
+
+      if (!gfi_ptr || gfi_ptr->key != gi_ptr)
+        {
+          /* This function appears in the other program.  We
+             need to buffer the information in order to write
+             it back out -- we'll be inserting data before
+             this point, so cannot simply keep the data in the
+             file.  */
+          fn_tail = buffer_fn_data (gi_filename,
+                                    gi_ptr, fn_tail, f_ix);
+          if (!fn_tail)
+            goto read_mismatch;
+          continue;
+        }
+
+      length = gcov_read_unsigned ();
+      if (length != gfi_ptr->ident)
+        goto read_mismatch;
+
+      length = gcov_read_unsigned ();
+      if (length != gfi_ptr->lineno_checksum)
+        goto read_mismatch;
+
+      length = gcov_read_unsigned ();
+      if (length != gfi_ptr->cfg_checksum)
+        goto read_mismatch;
+
+      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;
+
+          tag = gcov_read_unsigned ();
+          length = gcov_read_unsigned ();
+          if (tag != GCOV_TAG_FOR_COUNTER (t_ix)
+              || length != GCOV_TAG_COUNTER_LENGTH (ci_ptr->num))
+            goto read_mismatch;
+          (*merge) (ci_ptr->values, ci_ptr->num);
+          ci_ptr++;
+        }
+      if ((error = gcov_is_error ()))
+        goto read_error;
+    }
+
+  if (tag)
+    {
+    read_mismatch:;
+      gcov_error ("profiling:%s:Merge mismatch for %s %u\n",
+                  gi_filename, f_ix >= 0 ? "function" : "summary",
+                  f_ix < 0 ? -1 - f_ix : f_ix);
+      return -1;
+    }
+  return 0;
+
+read_error:
+  gcov_error ("profiling:%s:%s merging\n", gi_filename,
+              error < 0 ? "Overflow": "Error");
+  return -1;
+}
+
+/* Write counters in GI_PTR and the summary in PRG to a gcda file. In
+   the case of appending to an existing file, SUMMARY_POS will be non-zero.
+   We will write the file starting from SUMMAY_POS.  */
+
+static void
+gcov_exit_write_gcda (const struct gcov_info *gi_ptr,
+                      const struct gcov_summary *prg_p,
+                      const gcov_position_t eof_pos,
+                      const gcov_position_t summary_pos)
+{
+  unsigned f_ix;
+  struct gcov_summary_buffer *next_sum_buffer;
+
+  /* Write out the data.  */
+  if (!eof_pos)
+    {
+      gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION);
+      gcov_write_unsigned (gi_ptr->stamp);
+    }
+
+  if (summary_pos)
+    gcov_seek (summary_pos);
+
+  /* Generate whole program statistics.  */
+  gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, prg_p);
+
+  /* Rewrite all the summaries that were after the summary we merged
+     into. This is necessary as the merged summary may have a different
+     size due to the number of non-zero histogram entries changing after
+     merging.  */
+
+  while (sum_buffer)
+    {
+      gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &sum_buffer->summary);
+      next_sum_buffer = sum_buffer->next;
+      free (sum_buffer);
+      sum_buffer = next_sum_buffer;
+    }
+
+  /* Write execution counts for each function.  */
+  for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++)
+    {
+      unsigned buffered = 0;
+      const struct gcov_fn_info *gfi_ptr;
+      const struct gcov_ctr_info *ci_ptr;
+      gcov_unsigned_t length;
+      unsigned t_ix;
+
+      if (fn_buffer && fn_buffer->fn_ix == f_ix)
+        {
+          /* Buffered data from another program.  */
+          buffered = 1;
+          gfi_ptr = &fn_buffer->info;
+          length = GCOV_TAG_FUNCTION_LENGTH;
+        }
+      else
+        {
+          gfi_ptr = gi_ptr->functions[f_ix];
+          if (gfi_ptr && gfi_ptr->key == gi_ptr)
+            length = GCOV_TAG_FUNCTION_LENGTH;
+          else
+                length = 0;
+        }
+
+      gcov_write_tag_length (GCOV_TAG_FUNCTION, length);
+      if (!length)
+        continue;
+
+      gcov_write_unsigned (gfi_ptr->ident);
+      gcov_write_unsigned (gfi_ptr->lineno_checksum);
+      gcov_write_unsigned (gfi_ptr->cfg_checksum);
+
+      ci_ptr = gfi_ptr->ctrs;
+      for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
+        {
+          gcov_unsigned_t n_counts;
+          gcov_type *c_ptr;
+
+          if (!gi_ptr->merge[t_ix])
+            continue;
+
+          n_counts = ci_ptr->num;
+          gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix),
+                                 GCOV_TAG_COUNTER_LENGTH (n_counts));
+          c_ptr = ci_ptr->values;
+          while (n_counts--)
+            gcov_write_counter (*c_ptr++);
+          ci_ptr++;
+        }
+      if (buffered)
+        fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
+    }
+
+  gcov_write_unsigned (0);
+}
+
+/* Helper function for merging summary.
+   Return -1 on error. Return 0 on success.  */
+
+static int
+gcov_exit_merge_summary (const struct gcov_info *gi_ptr, struct gcov_summary *prg,
+                         struct gcov_summary *this_prg, gcov_unsigned_t crc32,
+			 struct gcov_summary *all_prg __attribute__ ((unused)))
+{
+  struct gcov_ctr_summary *cs_prg, *cs_tprg;
+  unsigned t_ix;
+#if !GCOV_LOCKED 
+  /* summary for all instances of program.  */ 
+  struct gcov_ctr_summary *cs_all;
+#endif 
+
+  /* Merge the summaries.  */
+  for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++)
+    {
+      cs_prg = &(prg->ctrs[t_ix]);
+      cs_tprg = &(this_prg->ctrs[t_ix]);
+
+      if (gi_ptr->merge[t_ix])
+        {
+	  int first = !cs_prg->runs;
+
+	  if (!run_accounted)
+	    cs_prg->runs++;
+          if (first)
+            cs_prg->num = cs_tprg->num;
+          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;
+          if (first)
+            memcpy (cs_prg->histogram, cs_tprg->histogram,
+                   sizeof (gcov_bucket_type) * GCOV_HISTOGRAM_SIZE);
+          else
+            gcov_histogram_merge (cs_prg->histogram, cs_tprg->histogram);
+        }
+      else if (cs_prg->runs)
+        {
+          gcov_error ("profiling:%s:Merge mismatch for summary.\n",
+                      gi_filename);
+          return -1;
+        }
+#if !GCOV_LOCKED
+      cs_all = &all_prg->ctrs[t_ix];
+      if (!cs_all->runs && cs_prg->runs)
+        {
+          cs_all->num = cs_prg->num;
+          cs_all->runs = cs_prg->runs;
+          cs_all->sum_all = cs_prg->sum_all;
+          cs_all->run_max = cs_prg->run_max;
+          cs_all->sum_max = cs_prg->sum_max;
+        }
+      else if (!all_prg->checksum
+               /* Don't compare the histograms, which may have slight
+                  variations depending on the order they were updated
+                  due to the truncating integer divides used in the
+                  merge.  */
+               && (cs_all->num != cs_prg->num
+                   || cs_all->runs != cs_prg->runs
+                   || cs_all->sum_all != cs_prg->sum_all
+                   || cs_all->run_max != cs_prg->run_max
+                   || cs_all->sum_max != cs_prg->sum_max))
+             {
+               gcov_error ("profiling:%s:Data file mismatch - some "
+                           "data files may have been concurrently "
+                           "updated without locking support\n", gi_filename);
+               all_prg->checksum = ~0u;
+             }
+#endif
+    }
+  
+  prg->checksum = crc32;
+
+  return 0;
+}
+
+/* Dump the coverage counts for one gcov_info object. 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_dump_gcov (struct gcov_info *gi_ptr, struct gcov_filename_aux *gf,
+		     gcov_unsigned_t crc32, struct gcov_summary *all_prg,
+                     struct gcov_summary *this_prg)
+{
+  struct gcov_summary prg; /* summary for this object over all program.  */
+  int error;
+  gcov_unsigned_t tag;
+  gcov_position_t summary_pos = 0;
+  gcov_position_t eof_pos = 0;
+
+  fn_buffer = 0;
+  sum_buffer = 0;
+
+  error = gcov_exit_open_gcda_file (gi_ptr, gf);
+  if (error == -1)
+    return;
+
+  tag = gcov_read_unsigned ();
+  if (tag)
+    {
+      /* Merge data from file.  */
+      if (tag != GCOV_DATA_MAGIC)
+        {
+          gcov_error ("profiling:%s:Not a gcov data file\n", gi_filename);
+          goto read_fatal;
+        }
+      error = gcov_exit_merge_gcda (gi_ptr, &prg, this_prg, &summary_pos, &eof_pos,
+				    crc32);
+      if (error == -1)
+        goto read_fatal;
+    }
+
+  gcov_rewrite ();
+
+  if (!summary_pos)
+    {
+      memset (&prg, 0, sizeof (prg));
+      summary_pos = eof_pos;
+    }
+
+  error = gcov_exit_merge_summary (gi_ptr, &prg, this_prg, crc32, all_prg);
+  if (error == -1)
+    goto read_fatal;
+
+  gcov_exit_write_gcda (gi_ptr, &prg, eof_pos, summary_pos);
+  /* fall through */
+
+read_fatal:;
+  while (fn_buffer)
+    fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
+
+  if ((error = gcov_close ()))
+    gcov_error (error  < 0 ?
+                "profiling:%s:Overflow writing\n" :
+                "profiling:%s:Error writing\n",
+                gi_filename);
+}
+
+
+/* Dump all the coverage counts for the program. It first computes program
+   summary and then traverses gcov_list list and dumps the gcov_info
+   objects one by one.  */
+
+void
+gcov_exit (void)
+{
+  struct gcov_info *gi_ptr;
+  struct gcov_filename_aux gf;
+  gcov_unsigned_t crc32;
+  struct gcov_summary all_prg;
+  struct gcov_summary this_prg;
+
+  /* Prevent the counters from being dumped a second time on exit when the
+     application already wrote out the profile using __gcov_dump().  */
+  if (gcov_dump_complete)
+    return;
+
+  crc32 = gcov_exit_compute_summary (&this_prg);
+
+  allocate_filename_struct (&gf);
+#if !GCOV_LOCKED
+  memset (&all_prg, 0, sizeof (all_prg));
+#endif
+
+  /* Now merge each file.  */
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    gcov_exit_dump_gcov (gi_ptr, &gf, crc32, &all_prg, &this_prg);
+  run_accounted = 1;
+
+  if (gi_filename)
+    free (gi_filename);
+}
+
+/* Reset all counters to zero.  */
+
+void
+gcov_clear (void)
+{
+  const struct gcov_info *gi_ptr;
+
+  for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next)
+    {
+      unsigned f_ix;
+
+      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];
+
+          if (!gfi_ptr || gfi_ptr->key != gi_ptr)
+            continue;
+          const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs;
+          for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++)
+            {
+              if (!gi_ptr->merge[t_ix])
+                continue;
+
+              memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num);
+              ci_ptr++;
+            }
+        }
+    }
+}
+
+/* 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 || !info->n_functions)
+    return;
+  if (gcov_version (info, info->version, 0))
+    {
+      size_t filename_length = strlen(info->filename);
+
+      /* Refresh the longest file name information */
+      if (filename_length > gcov_max_filename)
+        gcov_max_filename = filename_length;
+
+      if (!gcov_list)
+        atexit (gcov_exit);
+
+      info->next = gcov_list;
+      gcov_list = info;
+    }
+  info->version = 0;
+}
+
+#endif /* L_gcov */
+#endif /* inhibit_libc */