osprey/be/cg/gcov-io.h

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/*
 * Copyright 2003, 2004, 2005, 2006 PathScale, Inc.  All Rights Reserved.
 */

/* File format for coverage information
   Copyright (C) 1996, 1997, 1998, 2000, 2002 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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

/* Coverage information is held in two files.  A basic block graph
   file, which is generated by the compiler, and a counter file, which
   is generated by the program under test.  Both files use a similar
   structure.  We do not attempt to make these files backwards
   compatible with previous versions, as you only need coverage
   information when developing a program.  We do hold version
   information, so that mismatches can be detected, and we use a
   format that allows tools to skip information they do not understand
   or are not interested in.

   Numbers are recorded in big endian unsigned binary form.  Either in
   32 or 64 bits.  Strings are stored with a length count and NUL
   terminator, and 0 to 3 bytes of zero padding up to the next 4 byte
   boundary.  Zero length and NULL strings are simply stored as a
   length of zero (they have no trailing NUL or padding).

    int32:  byte3 byte2 byte1 byte0
  int64:  byte7 byte6 byte5 byte4 byte3 byte2 byte1 byte0
  string: int32:0 | int32:length char* char:0 padding
  padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
  item: int32 | int64 | string

   The basic format of the files is

    file : int32:magic int32:version record*

   The magic ident is different for the bbg and the counter files.
   The version is the same for both files and is derived from gcc's
   version number.  Although the ident and version are formally 32 bit
   numbers, they are derived from 4 character ASCII strings.  The
   version number consists of the single character major version
   number, a two character minor version number (leading zero for
   versions less than 10), and a single character indicating the
   status of the release.  That will be 'e' experimental, 'p'
   prerelease and 'r' for release.  Because, by good fortune, these are
   in alphabetical order, string collating can be used to compare
   version strings, and because numbers are stored big endian, numeric
   comparison can be used when it is read as a 32 bit value.  Be aware
   that the 'e' designation will (naturally) be unstable and might be
   incompatible with itself.  For gcc 3.4 experimental, it would be
   '304e' (0x33303465).  When the major version reaches 10, the letters
   A-Z will be used.  Assuming minor increments releases every 6
   months, we have to make a major increment every 50 years.  Assuming
   major increments releases every 5 years, we're ok for the next 155
   years -- good enough for me.

   A record has a tag, length and variable amount of data.

    record: header data
  header: int32:tag int32:length
  data: item*

   Records are not nested, but there is a record hierarchy.  Tag
   numbers reflect this hierarchy.  Tags are unique across bbg and da
   files.  Some record types have a varying amount of data.  The LENGTH
   is usually used to determine how much data.  The tag value is split
   into 4 8-bit fields, one for each of four possible levels.  The
   most significant is allocated first.  Unused levels are zero.
   Active levels are odd-valued, so that the LSB of the level is one.
   A sub-level incorporates the values of its superlevels.  This
   formatting allows you to determine the tag heirarchy, without
   understanding the tags themselves, and is similar to the standard
   section numbering used in technical documents.  Level values
   [1..3f] are used for common tags, values [41..9f] for the graph
   file and [a1..ff] for the counter file.

   The basic block graph file contains the following records
    bbg:  function-graph*
  function-graph: announce_function basic_blocks {arcs | lines}*
  announce_function: header string:name int32:checksum
  basic_block: header int32:flags*
  arcs: header int32:block_no arc*
  arc:  int32:dest_block int32:flags
        lines: header int32:block_no line*
               int32:0 string:NULL
  line:  int32:line_no | int32:0 string:filename

   The BASIC_BLOCK record holds per-bb flags.  The number of blocks
   can be inferred from its data length.  There is one ARCS record per
   basic block.  The number of arcs from a bb is implicit from the
   data length.  It enumerates the destination bb and per-arc flags.
   There is one LINES record per basic block, it enumerates the source
   lines which belong to that basic block.  Source file names are
   introduced by a line number of 0, following lines are from the new
   source file.  The initial source file for the function is NULL, but
   the current source file should be remembered from one LINES record
   to the next.  The end of a block is indicated by an empty filename
   - this does not reset the current source file.  Note there is no
   ordering of the ARCS and LINES records: they may be in any order,
   interleaved in any manner.  The current filename follows the order
   the LINES records are stored in the file, *not* the ordering of the
   blocks they are for.

   The data file contains the following records.
        da:   {function-data* summary:object summary:program*}*
        function-data:  announce_function arc_counts
  announce_function: header string:name int32:checksum
  arc_counts: header int64:count*
  summary: in32:checksum int32:runs int32:arcs int64:sum int64:max \
    int64:max_sum int64:sum_max

   The ANNOUNCE_FUNCTION record is the same as that in the BBG file.
   The ARC_COUNTS gives the counter values for those arcs that are
   instrumented.  The SUMMARY records give information about the whole
   object file and about the whole program.  The checksum is used for
   whole program summaries, and disambiguates different programs which
   include the same instrumented object file.  There may be several
   program summaries, each with a unique checksum.  The object
   summary's checkum is zero.  Note that the da file might contain
   information from several runs concatenated, or the data might be
   merged.

   This file is included by both the compiler, gcov tools and the
   library.  The IN_LIBGCC2 define distinguishes these cases.  When
   IN_LIBGCC2 is nonzero, we're building libgcc2 for the target and
   know the compiler is (the just built) gcc.  Otherwise we're
   generating code for the host, and the compiler may or may not be
   gcc.  In this latter case, you must ensure that 'gcov_type' is
   typedefed to something suitable (unsigned HOST_WIDEST_INT is
   usually what you want).  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public
   License.  */

#ifndef GCC_GCOV_IO_H
#define GCC_GCOV_IO_H

#include "mempool.h"

extern MEM_POOL  *name_pool_ptr;
#define GCOV_GRAPH_SUFFIX ".bbg"

#ifdef GCC_303
#if IN_LIBGCC2
#if LONG_TYPE_SIZE == GCOV_TYPE_SIZE
typedef long gcov_type;
#else
typedef long long gcov_type;
#endif
#else
typedef long long gcov_type;
#endif /* IN_LIBGCC2 */

/* File suffixes.  */
#define GCOV_DATA_SUFFIX ".da"

/* File magic.  */
#define GCOV_DATA_MAGIC  0x67636f76 /* "gcov" */
#define GCOV_GRAPH_MAGIC 0x67626267 /* "gbbg" */

/* gcov-iov.h is automatically generated by the makefile from
   version.c, it looks like
    #define GCOV_VERSION ((unsigned)0x89abcdef)
*/
//#include "gcov-iov.h"
#define GCOV_VERSION ((unsigned)858796842)

/* The record tags.  Values [1..3f] are for tags which may be in either
   file.  Values [41..9f] for those in the bbg file and [a1..ff] for
   the data file.  */

#define GCOV_TAG_FUNCTION  ((unsigned)0x01000000)
#define GCOV_TAG_BLOCKS    ((unsigned)0x01410000)
#define GCOV_TAG_ARCS    ((unsigned)0x01430000)
#define GCOV_TAG_LINES     ((unsigned)0x01450000)
#define GCOV_TAG_ARC_COUNTS    ((unsigned)0x01a10000)
#define GCOV_TAG_LOOP_HISTOGRAMS ((unsigned)0x01a30000)
#define GCOV_TAG_VALUE_HISTOGRAMS ((unsigned)0x01a50000)
#define GCOV_TAG_SAME_VALUE_HISTOGRAMS ((unsigned)0x01a70000)
#define GCOV_TAG_OBJECT_SUMMARY  ((unsigned)0xa1000000)
#define GCOV_TAG_PROGRAM_SUMMARY ((unsigned)0xa3000000)
#define GCOV_TAG_PLACEHOLDER_SUMMARY ((unsigned)0xa5000000)
#define GCOV_TAG_INCORRECT_SUMMARY ((unsigned)0xa7000000)

/* The tag level mask has 1's in the position of the inner levels, &
   the lsb of the current level, and zero on the current and outer
   levels.  */
#define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))

/* Return nonzero if SUB is an immediate subtag of TAG.  */
#define GCOV_TAG_IS_SUBTAG(TAG,SUB)       \
  (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB)  \
   && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG)))

/* Return nonzero if SUB is at a sublevel to TAG.  */
#define GCOV_TAG_IS_SUBLEVEL(TAG,SUB)       \
      (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))

/* Basic block flags.  */
#define GCOV_BLOCK_UNEXPECTED (1 << 0)

/* Arc flags.  */
#define GCOV_ARC_ON_TREE  (1 << 0)
#define GCOV_ARC_FAKE   (1 << 1)
#define GCOV_ARC_FALLTHROUGH  (1 << 2)

/* Structured records.  */

/* Object & program summary record.  */
struct gcov_summary
{
  unsigned checksum;    /* checksum of program */
  unsigned runs;    /* number of program runs */
  unsigned arcs;    /* number of instrumented arcs */
  gcov_type arc_sum;      /* sum of all arc counters */
  gcov_type arc_max_one;  /* max counter on any one run */
  gcov_type arc_max_sum;  /* maximum arc_sum */
  gcov_type arc_sum_max;  /* sum of max_one */
};

/* Structures embedded in coveraged program.  The structures generated
   by write_profile must match these.  */

/* Information about section of counters for a function.  */
struct counter_section
{
  unsigned tag;   /* Tag of the section.  */
  unsigned n_counters;  /* Number of counters in the section.  */
};

#if IN_LIBGCC2
/* Information about section of counters for an object file.  */
struct counter_section_data
{
  unsigned tag;   /* Tag of the section.  */
  unsigned n_counters;  /* Number of counters in the section.  */
  gcov_type *counters;  /* The data.  */
};

/* Information about a single function.  */
struct function_info
{
  const char *name;         /* (mangled) name of function */
  unsigned checksum;    /* function checksum */
  unsigned n_counter_sections;  /* Number of types of counters */
  const struct counter_section *counter_sections;
          /* The section descriptions */
};

/* Information about a single object file.  */
struct gcov_info
{
  unsigned long version;        /* expected version number */
  struct gcov_info *next; /* link to next, used by libgcc */

  const char *filename;   /* output file name */
  long wkspc;             /* libgcc workspace */

  unsigned n_functions;             /* number of functions */
  const struct function_info *functions; /* table of functions */

  unsigned n_counter_sections;  /* Number of types of counters */
  const struct counter_section_data *counter_sections;
          /* The data to be put into the sections.  */
};

/* Register a new object file module.  */
extern void __gcov_init (struct gcov_info *);

/* Called before fork, to avoid double counting.  */
extern void __gcov_flush (void);

#endif /* IN_LIBGCC2 */

#define PARAMS(P) P
#define ATTRIBUTE_UNUSED

/* Functions for reading and writing gcov files.  */
static int gcov_write_unsigned PARAMS((FILE *, unsigned))
     ATTRIBUTE_UNUSED;
static int gcov_write_counter PARAMS((FILE *, gcov_type))
     ATTRIBUTE_UNUSED;
static int gcov_write_string PARAMS((FILE *, const char *, unsigned))
     ATTRIBUTE_UNUSED;
static int gcov_read_unsigned PARAMS((FILE *, unsigned *))
     ATTRIBUTE_UNUSED;
static int gcov_read_counter PARAMS((FILE *, gcov_type *, int))
     ATTRIBUTE_UNUSED;
#if !IN_LIBGCC2
static int gcov_read_string PARAMS((FILE *, char **, unsigned *))
     ATTRIBUTE_UNUSED;
#endif
static int gcov_read_summary PARAMS ((FILE *, struct gcov_summary *))
     ATTRIBUTE_UNUSED;
#if IN_LIBGCC2
static int gcov_write_summary PARAMS ((FILE *, unsigned,
               const struct gcov_summary *))
     ATTRIBUTE_UNUSED;
#endif
#define gcov_save_position(STREAM) \
  ftell (STREAM)
#define gcov_reserve_length(STREAM) \
  (gcov_write_unsigned (STREAM, 0) ? 0 : ftell (STREAM) - 4)
static int gcov_write_length PARAMS((FILE *, long))
     ATTRIBUTE_UNUSED;
#define gcov_resync(STREAM, BASE, LENGTH) \
  fseek (STREAM, BASE + (long)LENGTH, SEEK_SET)
#define gcov_skip(STREAM, LENGTH) \
  fseek (STREAM, LENGTH, SEEK_CUR)
#define gcov_skip_string(STREAM, LENGTH) \
  fseek (STREAM, (LENGTH) + 4 - ((LENGTH) & 3), SEEK_CUR)
typedef int (*merger_function) PARAMS ((FILE *, gcov_type *, unsigned));
static int same_value_histograms_merger PARAMS ((FILE *, gcov_type *, unsigned))
     ATTRIBUTE_UNUSED;
static merger_function profile_merger_for_tag PARAMS ((unsigned))
     ATTRIBUTE_UNUSED;


/* Write VALUE to coverage file FILE.  Return nonzero if failed due to
   file i/o error, or value error.  */

static int
gcov_write_unsigned (
     FILE *file,
     unsigned value)
{
  char buffer[4];
  unsigned ix;
//  static int counter = 0;
//  printf ("%d: value %d\n", counter++, value);

  for (ix = sizeof (buffer); ix--; )
    {
      buffer[ix] = value;
      value >>= 8;
    }
  return ((sizeof (value) > sizeof (buffer) && value)
    || fwrite (buffer, sizeof (buffer), 1, file) != 1);
}

/* Write VALUE to coverage file FILE.  Return nonzero if failed due to
   file i/o error, or value error.  Negative values are not checked
   here -- they are checked in gcov_read_counter.  */

static int
gcov_write_counter (
     FILE *file,
     gcov_type value)
{
  char buffer[8];
  unsigned ix;

  for (ix = sizeof (buffer); ix--; )
    {
      buffer[ix] = value;
      value >>= 8;
    }
  return ((sizeof (value) > sizeof (buffer) && value != 0 && value != -1)
    || fwrite (buffer, sizeof (buffer), 1, file) != 1);
}

/* Write VALUE to coverage file FILE.  Return nonzero if failed due to
   file i/o error, or value error.  */

static int
gcov_write_string (
     FILE *file,
     const char *string,
     unsigned length)
{
  unsigned pad = 0;

  if (string)
    return (gcov_write_unsigned (file, length)
      || fwrite (string, length, 1, file) != 1
      || fwrite (&pad, 4 - (length & 3), 1, file) != 1);
  else
    return gcov_write_unsigned (file, 0);
}

/* Read *VALUE_P from coverage file FILE.  Return nonzero if failed
   due to file i/o error, or range error.  */

static int
gcov_read_unsigned (
     FILE *file,
     unsigned *value_p)
{
  unsigned value = 0;
  unsigned ix;
  unsigned char buffer[4];

  if (fread (buffer, sizeof (buffer), 1, file) != 1)
    return 1;
  for (ix = sizeof (value); ix < sizeof (buffer); ix++)
    if (buffer[ix])
      return 1;
  for (ix = 0; ix != sizeof (buffer); ix++)
    {
      value <<= 8;
      value |= buffer[ix];
    }
  *value_p = value;
  return 0;
}

/* Read *VALUE_P from coverage file FILE.  Return nonzero if failed
   due to file i/o error, or range error.  If not MAY_BE_NEGATIVE,
   report error if read value is negative.  */

static int
gcov_read_counter (
     FILE *file,
     gcov_type *value_p,
     int may_be_negative)
{
  gcov_type value = 0;
  unsigned ix;
  unsigned char buffer[8];

  if (fread (buffer, sizeof (buffer), 1, file) != 1)
    return 1;
  for (ix = sizeof (value); ix < sizeof (buffer); ix++)
    if (buffer[ix])
      return 1;
  for (ix = 0; ix != sizeof (buffer); ix++)
    {
      value <<= 8;
      value |= buffer[ix];
    }

  *value_p = value;
  return !may_be_negative && value < 0;
}

static int
same_value_histograms_merger (
     FILE *da_file,
     gcov_type *counters,
     unsigned n_counters)
{
  unsigned i, n_measures;
  gcov_type value, counter, all;

  if (n_counters % 3)
    return 1;

  n_measures = n_counters / 3;
  for (i = 0; i < n_measures; i++, counters += 3)
    {
      if (gcov_read_counter (da_file, &value, 1)
    || gcov_read_counter (da_file, &counter, 0)
    || gcov_read_counter (da_file, &all, 0))
  return 1;

      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;
    }
  return 0;
}

static merger_function
profile_merger_for_tag (
     unsigned tag)
{
  switch (tag)
    {
    case GCOV_TAG_SAME_VALUE_HISTOGRAMS:
      return same_value_histograms_merger;
    default:
      return 0;
    }
}

#if !IN_LIBGCC2

/* Read string from coverage file FILE.  Length is stored in *LENGTH_P
   (if non-null), a buffer is allocated and returned in *STRING_P.
   Return nonzero if failed due to file i/o error, or range
   error.  Uses xmalloc to allocate the string buffer.  */
static int
gcov_read_string (
     FILE *file,
     char **string_p,
     unsigned *length_p)
{
  unsigned length;

  if (gcov_read_unsigned (file, &length))
    return 1;

  if (length_p)
    *length_p = length;
  free (*string_p);

  *string_p = NULL;
  if (!length)
    return 0;

  length += 4 - (length & 3);
  *string_p = (char *) CXX_NEW_ARRAY (char, length, name_pool_ptr);

  return fread (*string_p, length, 1, file) != 1;

}

#endif /* !IN_LIBGCC2 */

/* Write a record length at PLACE.  The current file position is the
   end of the record, and is restored before returning.  Returns
   nonzero on failure.  */

static int
gcov_write_length (
     FILE *file,
     long place)
{
  long here = ftell (file);
  int result = (!place || fseek (file, place, SEEK_SET)
    || gcov_write_unsigned (file, here - place - 4));
  if (fseek (file, here, SEEK_SET))
    result = 1;
  return result;
}

#define GCOV_SUMMARY_LENGTH 44
static int
gcov_read_summary (
     FILE *da_file,
     struct gcov_summary *summary)
{
  return (gcov_read_unsigned (da_file, &summary->checksum)
    || gcov_read_unsigned (da_file, &summary->runs)
    || gcov_read_unsigned (da_file, &summary->arcs)
    || gcov_read_counter (da_file, &summary->arc_sum, 0)
    || gcov_read_counter (da_file, &summary->arc_max_one, 0)
    || gcov_read_counter (da_file, &summary->arc_max_sum, 0)
    || gcov_read_counter (da_file, &summary->arc_sum_max, 0));
}

#if IN_LIBGCC2
static int
gcov_write_summary (
     FILE *da_file,
     unsigned tag,
     const struct gcov_summary *summary)
{
  long base;

  return (gcov_write_unsigned (da_file, tag)
    || !(base = gcov_reserve_length (da_file))
    || gcov_write_unsigned (da_file, summary->checksum)
    || gcov_write_unsigned (da_file, summary->runs)
    || gcov_write_unsigned (da_file, summary->arcs)
    || gcov_write_counter (da_file, summary->arc_sum)
    || gcov_write_counter (da_file, summary->arc_max_one)
    || gcov_write_counter (da_file, summary->arc_max_sum)
    || gcov_write_counter (da_file, summary->arc_sum_max)
    || gcov_write_length (da_file, base));
}
#endif
#else
#include <stdio.h>
#include <sys/types.h>

#define PARAMS(P) P
#define ATTRIBUTE_UNUSED
typedef long long gcov_type;

static int __fetch_long PARAMS ((long *, char *, size_t))
        ATTRIBUTE_UNUSED;
static int __read_long  PARAMS ((long *, FILE *, size_t))
        ATTRIBUTE_UNUSED;
static int __write_long PARAMS ((long, FILE *, size_t))
        ATTRIBUTE_UNUSED;
static int __fetch_gcov_type PARAMS ((gcov_type *, char *, size_t))
        ATTRIBUTE_UNUSED;
static int __store_gcov_type PARAMS ((gcov_type, char *, size_t))
        ATTRIBUTE_UNUSED;
static int __read_gcov_type  PARAMS ((gcov_type *, FILE *, size_t))
        ATTRIBUTE_UNUSED;
static int __write_gcov_type PARAMS ((gcov_type, FILE *, size_t))
        ATTRIBUTE_UNUSED;
static int __write_gcov_string PARAMS ((const char *, size_t, FILE*, long))
        ATTRIBUTE_UNUSED;
static int __read_gcov_string PARAMS ((char *, size_t, FILE*, long))
        ATTRIBUTE_UNUSED;
                                                                         
/* These routines only work for signed values.  */
                                                                         
/* Store a portable representation of VALUE in DEST using BYTES*8-1 bits.   Return a nonzero value if VALUE requires more than BYTES*8-1 bits
   to store.  */
static int
__store_gcov_type (
     gcov_type value,
     char *dest,
     size_t bytes)
{
  int upper_bit = (value < 0 ? 128 : 0);
  size_t i;
                                                                         
  if (value < 0)
    {
      gcov_type oldvalue = value;
      value = -value;
      if (oldvalue != -value)
        return 1;
    }
                                                                         
  for(i = 0 ; i < (sizeof (value) < bytes ? sizeof (value) : bytes) ; i++) {
    dest[i] = value & (i == (bytes - 1) ? 127 : 255);
    value = value / 256;
  }
                                                                         
  if (value && value != -1)
    return 1;
                                                                         
  for(; i < bytes ; i++)
    dest[i] = 0;
  dest[bytes - 1] |= upper_bit;
  return 0;
}
                                                                         
/* Retrieve a quantity containing BYTES*8-1 bits from SOURCE and store
   the result in DEST. Returns a nonzero value if the value in SOURCE
   will not fit in DEST.  */
                                                                         
static int
__fetch_gcov_type (
     gcov_type *dest,
     char *source,
     size_t bytes)
{
  gcov_type value = 0;
  int i;
                                                                         
  for (i = bytes - 1; (size_t) i > (sizeof (*dest) - 1); i--)
    if (source[i] & ((size_t) i == (bytes - 1) ? 127 : 255 ))
      return 1;
                                                                         
  for (; i >= 0; i--)
    value = value * 256 + (source[i] & ((size_t)i == (bytes - 1) ? 127 :
255));
                                                                         
  if ((source[bytes - 1] & 128) && (value > 0))
    value = - value;
                                                                         
  *dest = value;
  return 0;
}
                                                                         
static int
__fetch_long (
     long *dest,
     char *source,
     size_t bytes)
{
  long value = 0;
  int i;
                                                                         
  for (i = bytes - 1; (size_t) i > (sizeof (*dest) - 1); i--)
    if (source[i] & ((size_t) i == (bytes - 1) ? 127 : 255 ))
      return 1;
                                                                         
  for (; i >= 0; i--)
    value = value * 256 + (source[i] & ((size_t)i == (bytes - 1) ? 127 :
255));
                                                                         
  if ((source[bytes - 1] & 128) && (value > 0))
    value = - value;
                                                                         
  *dest = value;
  return 0;
}
                                                                         
/* Write a BYTES*8-bit quantity to FILE, portably. Returns a nonzero
   value if the write fails, or if VALUE can't be stored in BYTES*8
   bits.
                                                                         
   Note that VALUE may not actually be large enough to hold BYTES*8
   bits, but BYTES characters will be written anyway.
                                                                         
   BYTES may be a maximum of 10.  */
                                                                         
static int
__write_gcov_type (
     gcov_type value,
     FILE *file,
     size_t bytes)
{
  char c[10];
                                                                         
  if (bytes > 10 || __store_gcov_type (value, c, bytes))
    return 1;
  else
    return fwrite(c, 1, bytes, file) != bytes;
}
                                                                         
static int
__write_long (
     long value,
     FILE *file,
     size_t bytes)
{
  char c[10];
//  static int counter = 0;
//  printf ("%d: %d\n",counter++, value);
                                                                         
  if (bytes > 10 || __store_gcov_type ((gcov_type)value, c, bytes))
    return 1;
  else
    return fwrite(c, 1, bytes, file) != bytes;
}
                                                                         
/* Read a quantity containing BYTES bytes from FILE, portably. Return
   a nonzero value if the read fails or if the value will not fit
   in DEST.
                                                                         
   Note that DEST may not be large enough to hold all of the requested
   data, but the function will read BYTES characters anyway.
                                                                         
   BYTES may be a maximum of 10.  */
                                                                         
static int
__read_gcov_type (
     gcov_type *dest,
     FILE *file,
     size_t bytes)
{
  char c[10];
                                                                         
  if (bytes > 10 || fread(c, 1, bytes, file) != bytes)
    return 1;
  else
    return __fetch_gcov_type (dest, c, bytes);
}
                                                                         
static int
__read_long (
     long *dest,
     FILE *file,
     size_t bytes)
{
  char c[10];
                                                                         
  if (bytes > 10 || fread(c, 1, bytes, file) != bytes)
    return 1;
  else
    return __fetch_long (dest, c, bytes);
}
                                                                         
                                                                         
/* Writes string in gcov format.  */
                                                                         
static int
__write_gcov_string (
     const char *string,
     size_t length,
     FILE *file,
     long delim)
{
  size_t temp = length + 1;
                                                                         
  /* delimiter */
  if (__write_long (delim, file, 4) != 0)
    return 1;
                                                                         
  if (__write_long (length, file, 4) != 0)
    return 1;
                                                                         
                                                                         
  if (fwrite (string, temp, 1, file) != 1)
    return 1;
                                                                         
  temp &= 3;
                                                                         
  if (temp)
    {
      char c[4];
                                                                         
      c[0] = c[1] = c[2] = c[3] = 0;
                                                                         
      if (fwrite (c, sizeof (char), 4 - temp, file) != 4 - temp)
        return 1;
    }
                                                                         
  if (__write_long (delim, file, 4) != 0)
    return 1;
                                                                         
  return 0;
}
                                                                         
/* Reads string in gcov format.  */
                                                                         
                                                                         
static int
__read_gcov_string (
     char *string,
     size_t max_length,
     FILE *file,
     long delim)
{
  long delim_from_file;
  long length;
  long read_length;
  long tmp;
                                                                         
  if (__read_long (&delim_from_file, file, 4) != 0)
    return 1;
                                                                         
  if (delim_from_file != delim)
    return 1;
                                                                         
  if (__read_long (&length, file, 4) != 0)
    return 1;
  if (length > (long) max_length)
    read_length = max_length;
  else
    read_length = length;
                                                                         
  tmp = (((length + 1) - 1) / 4 + 1) * 4;
  /* This is the size occupied by the string in the file */
                                                                         
  if (fread (string, read_length, 1, file) != 1)
    return 1;
                                                                         
  string[read_length] = 0;
                                                                         
  if (fseek (file, tmp - read_length, SEEK_CUR) < 0)
    return 1;
                                                                         
  if (__read_long (&delim_from_file, file, 4) != 0)
    return 1;
                                                                         
  if (delim_from_file != delim)
    return 1;
                                                                         
  return 0;
}

#endif
#endif /* GCC_GCOV_IO_H */

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