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/* Routines for saving various data types to a file stream.  This deals

   with various data types like strings, integers, enums, etc.

   Copyright 2011 Free Software Foundation, Inc.

   Contributed by Diego Novillo <dnovillo@google.com>

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

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/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "data-streamer.h"

/* Return index used to reference STRING of LEN characters in the string table

   in OB.  The string might or might not include a trailing '\0'.

   Then put the index onto the INDEX_STREAM.

   When PERSISTENT is set, the string S is supposed to not change during

   duration of the OB and thus OB can keep pointer into it.  */

unsigned

streamer_string_index (struct output_block *ob, const char *s, unsigned int len,

                       bool persistent)

{

  struct string_slot **slot;

  struct string_slot s_slot;

  s_slot.s = s;

  s_slot.len = len;

  s_slot.slot_num = 0;

  slot = (struct string_slot **) htab_find_slot (ob->string_hash_table,

                                                 &s_slot, INSERT);

  if (*slot == NULL)

    {

      struct lto_output_stream *string_stream = ob->string_stream;

      unsigned int start = string_stream->total_size;

      struct string_slot *new_slot = XOBNEW (&ob->obstack, struct string_slot);

      const char *string;

      if (!persistent)

        {

          char *tmp;

          string = tmp = XOBNEWVEC (&ob->obstack, char, len);

          memcpy (tmp, s, len);

        }

      else

        string = s;

      new_slot->s = string;

      new_slot->len = len;

      new_slot->slot_num = start;

      *slot = new_slot;

      streamer_write_uhwi_stream (string_stream, len);

      lto_output_data_stream (string_stream, string, len);

      return start + 1;

    }

  else

    {

      struct string_slot *old_slot = *slot;

      return old_slot->slot_num + 1;

    }

}

/* Output STRING of LEN characters to the string table in OB. The

   string might or might not include a trailing '\0'. Then put the

   index onto the INDEX_STREAM.

   When PERSISTENT is set, the string S is supposed to not change during

   duration of the OB and thus OB can keep pointer into it.  */

void

streamer_write_string_with_length (struct output_block *ob,

                                   struct lto_output_stream *index_stream,

                                   const char *s, unsigned int len,

                                   bool persistent)

{

  if (s)

    streamer_write_uhwi_stream (index_stream,

                                streamer_string_index (ob, s, len, persistent));

  else

    streamer_write_char_stream (index_stream, 0);

}

/* Output the '\0' terminated STRING to the string

   table in OB.  Then put the index onto the INDEX_STREAM.

   When PERSISTENT is set, the string S is supposed to not change during

   duration of the OB and thus OB can keep pointer into it.  */

void

streamer_write_string (struct output_block *ob,

                       struct lto_output_stream *index_stream,

                       const char *string, bool persistent)

{

  if (string)

    streamer_write_string_with_length (ob, index_stream, string,

                                       strlen (string) + 1,

                                       persistent);

  else

    streamer_write_char_stream (index_stream, 0);

}

/* Write a zero to the output stream.  */

void

streamer_write_zero (struct output_block *ob)

{

  streamer_write_char_stream (ob->main_stream, 0);

}

/* Write an unsigned HOST_WIDE_INT value WORK to OB->main_stream.  */

void

streamer_write_uhwi (struct output_block *ob, unsigned HOST_WIDE_INT work)

{

  streamer_write_uhwi_stream (ob->main_stream, work);

}

/* Write a HOST_WIDE_INT value WORK to OB->main_stream.  */

void

streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work)

{

  streamer_write_hwi_stream (ob->main_stream, work);

}

/* Write an unsigned HOST_WIDE_INT value WORK to OBS.  */

void

streamer_write_uhwi_stream (struct lto_output_stream *obs,

                            unsigned HOST_WIDE_INT work)

{

  do

    {

      unsigned int byte = (work & 0x7f);

      work >>= 7;

      if (work != 0)

        /* More bytes to follow.  */

        byte |= 0x80;

      streamer_write_char_stream (obs, byte);

    }

  while (work != 0);

}

/* Write a HOST_WIDE_INT value WORK to OBS.  */

void

streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work)

{

  int more, byte;

  do

    {

      byte = (work & 0x7f);

      /* arithmetic shift */

      work >>= 7;

      more = !((work == 0 && (byte & 0x40) == 0)

               || (work == -1 && (byte & 0x40) != 0));

      if (more)

        byte |= 0x80;

      streamer_write_char_stream (obs, byte);

    }

  while (more);

}