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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, 2012 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);
}
/* Output STRING of LEN characters to the string table in OB. Then
put the index into BP.
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
bp_pack_string_with_length (struct output_block *ob, struct bitpack_d *bp,
const char *s, unsigned int len, bool persistent)
{
unsigned index = 0;
if (s)
index = streamer_string_index (ob, s, len, persistent);
bp_pack_var_len_unsigned (bp, index);
}
/* Output the '\0' terminated STRING to the string
table in OB. Then put the index onto the bitpack BP.
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
bp_pack_string (struct output_block *ob, struct bitpack_d *bp,
const char *s, bool persistent)
{
unsigned index = 0;
if (s)
index = streamer_string_index (ob, s, strlen (s) + 1, persistent);
bp_pack_var_len_unsigned (bp, index);
}
/* 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);
}
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