Makefile.in (LIBGCOV): Remove.

	gcc:
	* Makefile.in (LIBGCOV): Remove.
	(libgcc.mvars): Remove LIBGCOV.
	* libgov.c: Move to ../libgcc.

	libgcc:
	* Makfile.in (LIBGCOV): New variable.
	($(libgcov-objects)): Use $(srcdir) to refer to libgcov.c.
	* libgcov.c: New file.

From-SVN: r176037

3 files changed, 1021 insertions, 2 deletions

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 091e674b188..a09b88a8c38 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,5 +1,11 @@
 2011-07-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
+	* Makfile.in (LIBGCOV): New variable.
+	($(libgcov-objects)): Use $(srcdir) to refer to libgcov.c.
+	* libgcov.c: New file.
+
+2011-07-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
 	* fixed-bit.c, fixed-bit.h: New files.
 	* fixed-obj.mk ($o$(objext), $(o)_s$(objext)): Use $(srcdir) to
 	refer to fixed-bit.c.
diff --git a/libgcc/Makefile.in b/libgcc/Makefile.in
index d0a1d1582ee..e204ef02ac1 100644
--- a/libgcc/Makefile.in
+++ b/libgcc/Makefile.in
@@ -747,9 +747,19 @@ iter-items := $(LIBUNWIND)
 include $(iterator)
 
 # Build libgcov components.
+
+# Defined in libgcov.c, included only in gcov library
+LIBGCOV = _gcov _gcov_merge_add _gcov_merge_single _gcov_merge_delta \
+    _gcov_fork _gcov_execl _gcov_execlp _gcov_execle \
+    _gcov_execv _gcov_execvp _gcov_execve \
+    _gcov_interval_profiler _gcov_pow2_profiler _gcov_one_value_profiler \
+    _gcov_indirect_call_profiler _gcov_average_profiler _gcov_ior_profiler \
+    _gcov_merge_ior
+
 libgcov-objects = $(patsubst %,%$(objext),$(LIBGCOV))
-$(libgcov-objects): %$(objext): $(gcc_srcdir)/libgcov.c
-	$(gcc_compile) -DL$* -c $(gcc_srcdir)/libgcov.c
+
+$(libgcov-objects): %$(objext): $(srcdir)/libgcov.c
+	$(gcc_compile) -DL$* -c $(srcdir)/libgcov.c
 
 
 # Static libraries.
diff --git a/libgcc/libgcov.c b/libgcc/libgcov.c
new file mode 100644
index 00000000000..b39ef49343f
--- /dev/null
+++ b/libgcc/libgcov.c
@@ -0,0 +1,1003 @@
+/* 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, 2008, 2009, 2010
+   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 "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;
+
+/* 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)
+{
+#if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
+  (void) filename;
+  return -1;
+#else
+  char *s;
+
+  s = filename;
+
+  if (HAS_DRIVE_SPEC(s))
+    s += 2;
+  if (IS_DIR_SEPARATOR(*s))
+    ++s;
+  for (; *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
+#ifdef TARGET_POSIX_IO
+            && mkdir (filename, 0755) == -1
+#else
+            && mkdir (filename) == -1
+#endif
+            /* 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++;
+	}
+    }
+
+  {
+    /* 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;
+      }
+  }
+  /* Get file name relocation prefix.  Non-absolute values are ignored. */
+  gcov_prefix = getenv("GCOV_PREFIX");
+  if (gcov_prefix)
+    {
+      prefix_length = strlen(gcov_prefix);
+
+      /* Remove an unnecessary trailing '/' */
+      if (IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
+	prefix_length--;
+    }
+  else
+    prefix_length = 0;
+
+  /* If no prefix was specified and a prefix stip, then we assume
+     relative.  */
+  if (gcov_prefix_strip != 0 && prefix_length == 0)
+    {
+      gcov_prefix = ".";
+      prefix_length = 1;
+    }
+  /* Allocate and initialize the filename scratch space plus one.  */
+  gi_filename = (char *) alloca (prefix_length + gcov_max_filename + 2);
+  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;
+      const char *fname, *s;
+
+      fname = gi_ptr->filename;
+
+      memset (&this_object, 0, sizeof (this_object));
+      memset (&object, 0, sizeof (object));
+
+      /* Avoid to add multiple drive letters into combined path.  */
+      if (prefix_length != 0 && HAS_DRIVE_SPEC(fname))
+        fname += 2;
+
+      /* Build relocated filename, stripping off leading
+         directories from the initial filename if requested. */
+      if (gcov_prefix_strip > 0)
+        {
+          int level = 0;
+          s = fname;
+          if (IS_DIR_SEPARATOR(*s))
+            ++s;
+
+          /* Skip selected directory levels. */
+	  for (; (*s != '\0') && (level < gcov_prefix_strip); s++)
+	    if (IS_DIR_SEPARATOR(*s))
+	      {
+		fname = s;
+		level++;
+	      }
+        }
+      /* Update complete filename with stripped original. */
+      if (prefix_length != 0 && !IS_DIR_SEPARATOR (*fname))
+        {
+          /* If prefix is given, add directory separator.  */
+	  strcpy (gi_filename_up, "/");
+	  strcpy (gi_filename_up + 1, fname);
+	}
+      else
+        strcpy (gi_filename_up, fname);
+
+      /* 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))
+	{
+	  /* 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;
+	    }
+	  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->lineno_checksum
+		  || gcov_read_unsigned () != fi_ptr->cfg_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->lineno_checksum);
+	  gcov_write_unsigned (fi_ptr->cfg_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_ior
+/* 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_ior (gcov_type *counters, unsigned n_counters)
+{
+  for (; n_counters; counters++, n_counters--)
+    *counters |= gcov_read_counter ();
+}
+#endif
+
+#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 value, counter, all;
+
+  gcc_assert (!(n_counters % 4));
+  n_measures = n_counters / 4;
+  for (i = 0; i < n_measures; i++, counters += 4)
+    {
+      /* last = */ gcov_read_counter ();
+      value = gcov_read_counter ();
+      counter = gcov_read_counter ();
+      all = gcov_read_counter ();
+
+      if (counters[1] == value)
+	counters[2] += counter;
+      else if (counter > counters[2])
+	{
+	  counters[1] = value;
+	  counters[2] = counter - counters[2];
+	}
+      else
+	counters[2] -= counter;
+      counters[3] += all;
+    }
+}
+#endif /* L_gcov_merge_delta */
+
+#ifdef L_gcov_interval_profiler
+/* If VALUE is in interval <START, START + STEPS - 1>, then increases the
+   corresponding counter in COUNTERS.  If the VALUE is above or below
+   the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased
+   instead.  */
+
+void
+__gcov_interval_profiler (gcov_type *counters, gcov_type value,
+			  int start, unsigned steps)
+{
+  gcov_type delta = value - start;
+  if (delta < 0)
+    counters[steps + 1]++;
+  else if (delta >= steps)
+    counters[steps]++;
+  else
+    counters[delta]++;
+}
+#endif
+
+#ifdef L_gcov_pow2_profiler
+/* If VALUE is a power of two, COUNTERS[1] is incremented.  Otherwise
+   COUNTERS[0] is incremented.  */
+
+void
+__gcov_pow2_profiler (gcov_type *counters, gcov_type value)
+{
+  if (value & (value - 1))
+    counters[0]++;
+  else
+    counters[1]++;
+}
+#endif
+
+/* Tries to determine the most common value among its inputs.  Checks if the
+   value stored in COUNTERS[0] matches VALUE.  If this is the case, COUNTERS[1]
+   is incremented.  If this is not the case and COUNTERS[1] is not zero,
+   COUNTERS[1] is decremented.  Otherwise COUNTERS[1] is set to one and
+   VALUE is stored to COUNTERS[0].  This algorithm guarantees that if this
+   function is called more than 50% of the time with one value, this value
+   will be in COUNTERS[0] in the end.
+
+   In any case, COUNTERS[2] is incremented.  */
+
+static inline void
+__gcov_one_value_profiler_body (gcov_type *counters, gcov_type value)
+{
+  if (value == counters[0])
+    counters[1]++;
+  else if (counters[1] == 0)
+    {
+      counters[1] = 1;
+      counters[0] = value;
+    }
+  else
+    counters[1]--;
+  counters[2]++;
+}
+
+#ifdef L_gcov_one_value_profiler
+void
+__gcov_one_value_profiler (gcov_type *counters, gcov_type value)
+{
+  __gcov_one_value_profiler_body (counters, value);
+}
+#endif
+
+#ifdef L_gcov_indirect_call_profiler
+
+/* By default, the C++ compiler will use function addresses in the
+   vtable entries.  Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero
+   tells the compiler to use function descriptors instead.  The value
+   of this macro says how many words wide the descriptor is (normally 2),
+   but it may be dependent on target flags.  Since we do not have access
+   to the target flags here we just check to see if it is set and use
+   that to set VTABLE_USES_DESCRIPTORS to 0 or 1.
+
+   It is assumed that the address of a function descriptor may be treated
+   as a pointer to a function.  */
+
+#ifdef TARGET_VTABLE_USES_DESCRIPTORS
+#define VTABLE_USES_DESCRIPTORS 1
+#else
+#define VTABLE_USES_DESCRIPTORS 0
+#endif
+
+/* Tries to determine the most common value among its inputs. */
+void
+__gcov_indirect_call_profiler (gcov_type* counter, gcov_type value,
+			       void* cur_func, void* callee_func)
+{
+  /* If the C++ virtual tables contain function descriptors then one
+     function may have multiple descriptors and we need to dereference
+     the descriptors to see if they point to the same function.  */
+  if (cur_func == callee_func
+      || (VTABLE_USES_DESCRIPTORS && callee_func
+	  && *(void **) cur_func == *(void **) callee_func))
+    __gcov_one_value_profiler_body (counter, value);
+}
+#endif
+
+
+#ifdef L_gcov_average_profiler
+/* Increase corresponding COUNTER by VALUE.  FIXME: Perhaps we want
+   to saturate up.  */
+
+void
+__gcov_average_profiler (gcov_type *counters, gcov_type value)
+{
+  counters[0] += value;
+  counters[1] ++;
+}
+#endif
+
+#ifdef L_gcov_ior_profiler
+/* Increase corresponding COUNTER by VALUE.  FIXME: Perhaps we want
+   to saturate up.  */
+
+void
+__gcov_ior_profiler (gcov_type *counters, gcov_type value)
+{
+  *counters |= value;
+}
+#endif
+
+#ifdef L_gcov_fork
+/* A wrapper for the fork function.  Flushes the accumulated profiling data, so
+   that they are not counted twice.  */
+
+pid_t
+__gcov_fork (void)
+{
+  __gcov_flush ();
+  return fork ();
+}
+#endif
+
+#ifdef L_gcov_execl
+/* A wrapper for the execl function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execl (const char *path, char *arg, ...)
+{
+  va_list ap, aq;
+  unsigned i, length;
+  char **args;
+
+  __gcov_flush ();
+
+  va_start (ap, arg);
+  va_copy (aq, ap);
+
+  length = 2;
+  while (va_arg (ap, char *))
+    length++;
+  va_end (ap);
+
+  args = (char **) alloca (length * sizeof (void *));
+  args[0] = arg;
+  for (i = 1; i < length; i++)
+    args[i] = va_arg (aq, char *);
+  va_end (aq);
+
+  return execv (path, args);
+}
+#endif
+
+#ifdef L_gcov_execlp
+/* A wrapper for the execlp function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execlp (const char *path, char *arg, ...)
+{
+  va_list ap, aq;
+  unsigned i, length;
+  char **args;
+
+  __gcov_flush ();
+
+  va_start (ap, arg);
+  va_copy (aq, ap);
+
+  length = 2;
+  while (va_arg (ap, char *))
+    length++;
+  va_end (ap);
+
+  args = (char **) alloca (length * sizeof (void *));
+  args[0] = arg;
+  for (i = 1; i < length; i++)
+    args[i] = va_arg (aq, char *);
+  va_end (aq);
+
+  return execvp (path, args);
+}
+#endif
+
+#ifdef L_gcov_execle
+/* A wrapper for the execle function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execle (const char *path, char *arg, ...)
+{
+  va_list ap, aq;
+  unsigned i, length;
+  char **args;
+  char **envp;
+
+  __gcov_flush ();
+
+  va_start (ap, arg);
+  va_copy (aq, ap);
+
+  length = 2;
+  while (va_arg (ap, char *))
+    length++;
+  va_end (ap);
+
+  args = (char **) alloca (length * sizeof (void *));
+  args[0] = arg;
+  for (i = 1; i < length; i++)
+    args[i] = va_arg (aq, char *);
+  envp = va_arg (aq, char **);
+  va_end (aq);
+
+  return execve (path, args, envp);
+}
+#endif
+
+#ifdef L_gcov_execv
+/* A wrapper for the execv function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execv (const char *path, char *const argv[])
+{
+  __gcov_flush ();
+  return execv (path, argv);
+}
+#endif
+
+#ifdef L_gcov_execvp
+/* A wrapper for the execvp function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execvp (const char *path, char *const argv[])
+{
+  __gcov_flush ();
+  return execvp (path, argv);
+}
+#endif
+
+#ifdef L_gcov_execve
+/* A wrapper for the execve function.  Flushes the accumulated profiling data, so
+   that they are not lost.  */
+
+int
+__gcov_execve (const char *path, char *const argv[], char *const envp[])
+{
+  __gcov_flush ();
+  return execve (path, argv, envp);
+}
+#endif
+#endif /* inhibit_libc */