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/* File format for coverage information

   Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004, 2005, 2007

   Free Software Foundation, Inc.

   Contributed by Bob Manson <manson@cygnus.com>.

   Completely remangled by Nathan Sidwell <nathan@codesourcery.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.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

/* Routines declared in gcov-io.h.  This file should be #included by

   another source file, after having #included gcov-io.h.  */

#if !IN_GCOV

static void gcov_write_block (unsigned);

static gcov_unsigned_t *gcov_write_words (unsigned);

#endif

static const gcov_unsigned_t *gcov_read_words (unsigned);

#if !IN_LIBGCOV

static void gcov_allocate (unsigned);

#endif

static inline gcov_unsigned_t from_file (gcov_unsigned_t value)

{

#if !IN_LIBGCOV

  if (gcov_var.endian)

    {

      value = (value >> 16) | (value << 16);

      value = ((value & 0xff00ff) << 8) | ((value >> 8) & 0xff00ff);

    }

#endif

  return value;

}

/* Open a gcov file. NAME is the name of the file to open and MODE

   indicates whether a new file should be created, or an existing file

   opened for modification. If MODE is >= 0 an existing file will be

   opened, if possible, and if MODE is <= 0, a new file will be

   created. Use MODE=0 to attempt to reopen an existing file and then

   fall back on creating a new one.  Return zero on failure, >0 on

   opening an existing file and <0 on creating a new one.  */

GCOV_LINKAGE int

#if IN_LIBGCOV

gcov_open (const char *name)

#else

gcov_open (const char *name, int mode)

#endif

{

#if IN_LIBGCOV

  const int mode = 0;

#endif

#if GCOV_LOCKED

  struct flock s_flock;

  int fd;

  s_flock.l_type = F_WRLCK;

  s_flock.l_whence = SEEK_SET;

  s_flock.l_start = 0;

  s_flock.l_len = 0; /* Until EOF.  */

  s_flock.l_pid = getpid ();

#endif

  gcc_assert (!gcov_var.file);

  gcov_var.start = 0;

  gcov_var.offset = gcov_var.length = 0;

  gcov_var.overread = -1u;

  gcov_var.error = 0;

#if !IN_LIBGCOV

  gcov_var.endian = 0;

#endif

#if GCOV_LOCKED

  if (mode > 0)

    fd = open (name, O_RDWR);

  else

    fd = open (name, O_RDWR | O_CREAT, 0666);

  if (fd < 0)

    return 0;

  while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR)

    continue;

  gcov_var.file = fdopen (fd, "r+b");

  if (!gcov_var.file)

    {

      close (fd);

      return 0;

    }

  if (mode > 0)

    gcov_var.mode = 1;

  else if (mode == 0)

    {

      struct stat st;

      if (fstat (fd, &st) < 0)

        {

          fclose (gcov_var.file);

          gcov_var.file = 0;

          return 0;

        }

      if (st.st_size != 0)

        gcov_var.mode = 1;

      else

        gcov_var.mode = mode * 2 + 1;

    }

  else

    gcov_var.mode = mode * 2 + 1;

#else

  if (mode >= 0)

    gcov_var.file = fopen (name, "r+b");

  if (gcov_var.file)

    gcov_var.mode = 1;

  else if (mode <= 0)

    {

      gcov_var.file = fopen (name, "w+b");

      if (gcov_var.file)

        gcov_var.mode = mode * 2 + 1;

    }

  if (!gcov_var.file)

    return 0;

#endif

  setbuf (gcov_var.file, (char *)0);

  return 1;

}

/* Close the current gcov file. Flushes data to disk. Returns nonzero

   on failure or error flag set.  */

GCOV_LINKAGE int

gcov_close (void)

{

  if (gcov_var.file)

    {

#if !IN_GCOV

      if (gcov_var.offset && gcov_var.mode < 0)

        gcov_write_block (gcov_var.offset);

#endif

      fclose (gcov_var.file);

      gcov_var.file = 0;

      gcov_var.length = 0;

    }

#if !IN_LIBGCOV

  free (gcov_var.buffer);

  gcov_var.alloc = 0;

  gcov_var.buffer = 0;

#endif

  gcov_var.mode = 0;

  return gcov_var.error;

}

#if !IN_LIBGCOV

/* Check if MAGIC is EXPECTED. Use it to determine endianness of the

   file. Returns +1 for same endian, -1 for other endian and zero for

   not EXPECTED.  */

GCOV_LINKAGE int

gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected)

{

  if (magic == expected)

    return 1;

  magic = (magic >> 16) | (magic << 16);

  magic = ((magic & 0xff00ff) << 8) | ((magic >> 8) & 0xff00ff);

  if (magic == expected)

    {

      gcov_var.endian = 1;

      return -1;

    }

  return 0;

}

#endif

#if !IN_LIBGCOV

static void

gcov_allocate (unsigned length)

{

  size_t new_size = gcov_var.alloc;

  if (!new_size)

    new_size = GCOV_BLOCK_SIZE;

  new_size += length;

  new_size *= 2;

  gcov_var.alloc = new_size;

  gcov_var.buffer = xrealloc (gcov_var.buffer, new_size << 2);

}

#endif

#if !IN_GCOV

/* Write out the current block, if needs be.  */

static void

gcov_write_block (unsigned size)

{

  if (fwrite (gcov_var.buffer, size << 2, 1, gcov_var.file) != 1)

    gcov_var.error = 1;

  gcov_var.start += size;

  gcov_var.offset -= size;

}

/* Allocate space to write BYTES bytes to the gcov file. Return a

   pointer to those bytes, or NULL on failure.  */

static gcov_unsigned_t *

gcov_write_words (unsigned words)

{

  gcov_unsigned_t *result;

  gcc_assert (gcov_var.mode < 0);

#if IN_LIBGCOV

  if (gcov_var.offset >= GCOV_BLOCK_SIZE)

    {

      gcov_write_block (GCOV_BLOCK_SIZE);

      if (gcov_var.offset)

        {

          gcc_assert (gcov_var.offset == 1);

          memcpy (gcov_var.buffer, gcov_var.buffer + GCOV_BLOCK_SIZE, 4);

        }

    }

#else

  if (gcov_var.offset + words > gcov_var.alloc)

    gcov_allocate (gcov_var.offset + words);

#endif

  result = &gcov_var.buffer[gcov_var.offset];

  gcov_var.offset += words;

  return result;

}

/* Write unsigned VALUE to coverage file.  Sets error flag

   appropriately.  */

GCOV_LINKAGE void

gcov_write_unsigned (gcov_unsigned_t value)

{

  gcov_unsigned_t *buffer = gcov_write_words (1);

  buffer[0] = value;

}

/* Write counter VALUE to coverage file.  Sets error flag

   appropriately.  */

#if IN_LIBGCOV

GCOV_LINKAGE void

gcov_write_counter (gcov_type value)

{

  gcov_unsigned_t *buffer = gcov_write_words (2);

  buffer[0] = (gcov_unsigned_t) value;

  if (sizeof (value) > sizeof (gcov_unsigned_t))

    buffer[1] = (gcov_unsigned_t) (value >> 32);

  else

    buffer[1] = 0;

}

#endif /* IN_LIBGCOV */

#if !IN_LIBGCOV

/* Write STRING to coverage file.  Sets error flag on file

   error, overflow flag on overflow */

GCOV_LINKAGE void

gcov_write_string (const char *string)

{

  unsigned length = 0;

  unsigned alloc = 0;

  gcov_unsigned_t *buffer;

  if (string)

    {

      length = strlen (string);

      alloc = (length + 4) >> 2;

    }

  buffer = gcov_write_words (1 + alloc);

  buffer[0] = alloc;

  buffer[alloc] = 0;

  memcpy (&buffer[1], string, length);

}

#endif

#if !IN_LIBGCOV

/* Write a tag TAG and reserve space for the record length. Return a

   value to be used for gcov_write_length.  */

GCOV_LINKAGE gcov_position_t

gcov_write_tag (gcov_unsigned_t tag)

{

  gcov_position_t result = gcov_var.start + gcov_var.offset;

  gcov_unsigned_t *buffer = gcov_write_words (2);

  buffer[0] = tag;

  buffer[1] = 0;

  return result;

}

/* Write a record length using POSITION, which was returned by

   gcov_write_tag.  The current file position is the end of the

   record, and is restored before returning.  Returns nonzero on

   overflow.  */

GCOV_LINKAGE void

gcov_write_length (gcov_position_t position)

{

  unsigned offset;

  gcov_unsigned_t length;

  gcov_unsigned_t *buffer;

  gcc_assert (gcov_var.mode < 0);

  gcc_assert (position + 2 <= gcov_var.start + gcov_var.offset);

  gcc_assert (position >= gcov_var.start);

  offset = position - gcov_var.start;

  length = gcov_var.offset - offset - 2;

  buffer = (gcov_unsigned_t *) &gcov_var.buffer[offset];

  buffer[1] = length;

  if (gcov_var.offset >= GCOV_BLOCK_SIZE)

    gcov_write_block (gcov_var.offset);

}

#else /* IN_LIBGCOV */

/* Write a tag TAG and length LENGTH.  */

GCOV_LINKAGE void

gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length)

{

  gcov_unsigned_t *buffer = gcov_write_words (2);

  buffer[0] = tag;

  buffer[1] = length;

}

/* Write a summary structure to the gcov file.  Return nonzero on

   overflow.  */

GCOV_LINKAGE void

gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary)

{

  unsigned ix;

  const struct gcov_ctr_summary *csum;

  gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);

  gcov_write_unsigned (summary->checksum);

  for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)

    {

      gcov_write_unsigned (csum->num);

      gcov_write_unsigned (csum->runs);

      gcov_write_counter (csum->sum_all);

      gcov_write_counter (csum->run_max);

      gcov_write_counter (csum->sum_max);

    }

}

#endif /* IN_LIBGCOV */

#endif /*!IN_GCOV */

/* Return a pointer to read BYTES bytes from the gcov file. Returns

   NULL on failure (read past EOF).  */

static const gcov_unsigned_t *

gcov_read_words (unsigned words)

{

  const gcov_unsigned_t *result;

  unsigned excess = gcov_var.length - gcov_var.offset;

  gcc_assert (gcov_var.mode > 0);

  if (excess < words)

    {

      gcov_var.start += gcov_var.offset;

#if IN_LIBGCOV

      if (excess)

        {

          gcc_assert (excess == 1);

          memcpy (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, 4);

        }

#else

      memmove (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4);

#endif

      gcov_var.offset = 0;

      gcov_var.length = excess;

#if IN_LIBGCOV

      gcc_assert (!gcov_var.length || gcov_var.length == 1);

      excess = GCOV_BLOCK_SIZE;

#else

      if (gcov_var.length + words > gcov_var.alloc)

        gcov_allocate (gcov_var.length + words);

      excess = gcov_var.alloc - gcov_var.length;

#endif

      excess = fread (gcov_var.buffer + gcov_var.length,

                      1, excess << 2, gcov_var.file) >> 2;

      gcov_var.length += excess;

      if (gcov_var.length < words)

        {

          gcov_var.overread += words - gcov_var.length;

          gcov_var.length = 0;

          return 0;

        }

    }

  result = &gcov_var.buffer[gcov_var.offset];

  gcov_var.offset += words;

  return result;

}

/* Read unsigned value from a coverage file. Sets error flag on file

   error, overflow flag on overflow */

GCOV_LINKAGE gcov_unsigned_t

gcov_read_unsigned (void)

{

  gcov_unsigned_t value;

  const gcov_unsigned_t *buffer = gcov_read_words (1);

  if (!buffer)

    return 0;

  value = from_file (buffer[0]);

  return value;

}

/* Read counter value from a coverage file. Sets error flag on file

   error, overflow flag on overflow */

GCOV_LINKAGE gcov_type

gcov_read_counter (void)

{

  gcov_type value;

  const gcov_unsigned_t *buffer = gcov_read_words (2);

  if (!buffer)

    return 0;

  value = from_file (buffer[0]);

  if (sizeof (value) > sizeof (gcov_unsigned_t))

    value |= ((gcov_type) from_file (buffer[1])) << 32;

  else if (buffer[1])

    gcov_var.error = -1;

  return value;

}

/* Read string from coverage file. Returns a pointer to a static

   buffer, or NULL on empty string. You must copy the string before

   calling another gcov function.  */

#if !IN_LIBGCOV

GCOV_LINKAGE const char *

gcov_read_string (void)

{

  unsigned length = gcov_read_unsigned ();

  if (!length)

    return 0;

  return (const char *) gcov_read_words (length);

}

#endif

GCOV_LINKAGE void

gcov_read_summary (struct gcov_summary *summary)

{

  unsigned ix;

  struct gcov_ctr_summary *csum;

  summary->checksum = gcov_read_unsigned ();

  for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)

    {

      csum->num = gcov_read_unsigned ();

      csum->runs = gcov_read_unsigned ();

      csum->sum_all = gcov_read_counter ();

      csum->run_max = gcov_read_counter ();

      csum->sum_max = gcov_read_counter ();

    }

}

#if !IN_LIBGCOV

/* Reset to a known position.  BASE should have been obtained from

   gcov_position, LENGTH should be a record length.  */

GCOV_LINKAGE void

gcov_sync (gcov_position_t base, gcov_unsigned_t length)

{

  gcc_assert (gcov_var.mode > 0);

  base += length;

  if (base - gcov_var.start <= gcov_var.length)

    gcov_var.offset = base - gcov_var.start;

  else

    {

      gcov_var.offset = gcov_var.length = 0;

      fseek (gcov_var.file, base << 2, SEEK_SET);

      gcov_var.start = ftell (gcov_var.file) >> 2;

    }

}

#endif

#if IN_LIBGCOV

/* Move to the a set position in a gcov file.  */

GCOV_LINKAGE void

gcov_seek (gcov_position_t base)

{

  gcc_assert (gcov_var.mode < 0);

  if (gcov_var.offset)

    gcov_write_block (gcov_var.offset);

  fseek (gcov_var.file, base << 2, SEEK_SET);

  gcov_var.start = ftell (gcov_var.file) >> 2;

}

#endif

#if IN_GCOV > 0

/* Return the modification time of the current gcov file.  */

GCOV_LINKAGE time_t

gcov_time (void)

{

  struct stat status;

  if (fstat (fileno (gcov_var.file), &status))

    return 0;

  else

    return status.st_mtime;

}

#endif /* IN_GCOV */