gcc/gcc/data-streamer-out.c

404 lines
11 KiB
C

/* Routines for saving various data types to a file stream. This deals
with various data types like strings, integers, enums, etc.
Copyright (C) 2011-2019 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 "backend.h"
#include "tree.h"
#include "gimple.h"
#include "cgraph.h"
#include "data-streamer.h"
/* Adds a new block to output stream OBS. */
void
lto_append_block (struct lto_output_stream *obs)
{
struct lto_char_ptr_base *new_block;
gcc_assert (obs->left_in_block == 0);
if (obs->first_block == NULL)
{
/* This is the first time the stream has been written
into. */
obs->block_size = 1024;
new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
obs->first_block = new_block;
}
else
{
struct lto_char_ptr_base *tptr;
/* Get a new block that is twice as big as the last block
and link it into the list. */
obs->block_size *= 2;
new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
/* The first bytes of the block are reserved as a pointer to
the next block. Set the chain of the full block to the
pointer to the new block. */
tptr = obs->current_block;
tptr->ptr = (char *) new_block;
}
/* Set the place for the next char at the first position after the
chain to the next block. */
obs->current_pointer
= ((char *) new_block) + sizeof (struct lto_char_ptr_base);
obs->current_block = new_block;
/* Null out the newly allocated block's pointer to the next block. */
new_block->ptr = NULL;
obs->left_in_block = obs->block_size - sizeof (struct lto_char_ptr_base);
}
/* 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. */
static 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 = ob->string_hash_table->find_slot (&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);
streamer_write_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 a gcov counter value WORK to OB->main_stream. */
void
streamer_write_gcov_count (struct output_block *ob, gcov_type work)
{
streamer_write_gcov_count_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)
{
if (obs->left_in_block == 0)
lto_append_block (obs);
char *current_pointer = obs->current_pointer;
unsigned int left_in_block = obs->left_in_block;
unsigned int size = 0;
do
{
unsigned int byte = (work & 0x7f);
work >>= 7;
if (work != 0)
/* More bytes to follow. */
byte |= 0x80;
*(current_pointer++) = byte;
left_in_block--;
size++;
}
while (work != 0 && left_in_block > 0);
if (work != 0)
{
obs->left_in_block = 0;
lto_append_block (obs);
current_pointer = obs->current_pointer;
left_in_block = obs->left_in_block;
do
{
unsigned int byte = (work & 0x7f);
work >>= 7;
if (work != 0)
/* More bytes to follow. */
byte |= 0x80;
*(current_pointer++) = byte;
left_in_block--;
size++;
}
while (work != 0);
}
obs->current_pointer = current_pointer;
obs->left_in_block = left_in_block;
obs->total_size += size;
}
/* Write a HOST_WIDE_INT value WORK to OBS. */
void
streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work)
{
if (obs->left_in_block == 0)
lto_append_block (obs);
char *current_pointer = obs->current_pointer;
unsigned int left_in_block = obs->left_in_block;
unsigned int size = 0;
bool more;
do
{
unsigned int byte = (work & 0x7f);
/* If the lower 7-bits are sign-extended 0 or -1 we are finished. */
work >>= 6;
more = !(work == 0 || work == -1);
if (more)
{
/* More bits to follow. */
work >>= 1;
byte |= 0x80;
}
*(current_pointer++) = byte;
left_in_block--;
size++;
}
while (more && left_in_block > 0);
if (more)
{
obs->left_in_block = 0;
lto_append_block (obs);
current_pointer = obs->current_pointer;
left_in_block = obs->left_in_block;
do
{
unsigned int byte = (work & 0x7f);
work >>= 6;
more = !(work == 0 || work == -1);
if (more)
{
work >>= 1;
byte |= 0x80;
}
*(current_pointer++) = byte;
left_in_block--;
size++;
}
while (more);
}
obs->current_pointer = current_pointer;
obs->left_in_block = left_in_block;
obs->total_size += size;
}
/* Write a GCOV counter value WORK to OBS. */
void
streamer_write_gcov_count_stream (struct lto_output_stream *obs, gcov_type work)
{
gcc_assert ((HOST_WIDE_INT) work == work);
streamer_write_hwi_stream (obs, work);
}
/* Write raw DATA of length LEN to the output block OB. */
void
streamer_write_data_stream (struct lto_output_stream *obs, const void *data,
size_t len)
{
while (len)
{
size_t copy;
/* No space left. */
if (obs->left_in_block == 0)
lto_append_block (obs);
/* Determine how many bytes to copy in this loop. */
if (len <= obs->left_in_block)
copy = len;
else
copy = obs->left_in_block;
/* Copy the data and do bookkeeping. */
memcpy (obs->current_pointer, data, copy);
obs->current_pointer += copy;
obs->total_size += copy;
obs->left_in_block -= copy;
data = (const char *) data + copy;
len -= copy;
}
}
/* Emit the physical representation of wide_int VAL to output block OB. */
void
streamer_write_wide_int (struct output_block *ob, const wide_int &val)
{
int len = val.get_len ();
streamer_write_uhwi (ob, val.get_precision ());
streamer_write_uhwi (ob, len);
for (int i = 0; i < len; i++)
streamer_write_hwi (ob, val.elt (i));
}
/* Emit the physical representation of widest_int W to output block OB. */
void
streamer_write_widest_int (struct output_block *ob,
const widest_int &w)
{
int len = w.get_len ();
streamer_write_uhwi (ob, w.get_precision ());
streamer_write_uhwi (ob, len);
for (int i = 0; i < len; i++)
streamer_write_hwi (ob, w.elt (i));
}