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/* Shared pool of memory blocks for pool allocators.
Copyright (C) 2015-2019 Free Software Foundation, Inc.
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 "memory-block.h"
#include "obstack.h"
/* Global singleton-like instance. */
memory_block_pool memory_block_pool::instance;
memory_block_pool::memory_block_pool () : m_blocks (NULL) {}
/* Reduce free list to NUM blocks and return remaining to malloc. */
void
memory_block_pool::reduce_free_list (int num)
{
block_list **blocks = &m_blocks;
/* First skip NUM blocks. */
for (;num > 0 && *blocks; num--)
blocks = &(*blocks)->m_next;
if (!*blocks)
return;
/* And free the remainder of them. */
block_list *to_free = *blocks;
*blocks = NULL;
while (to_free)
{
block_list *next = to_free->m_next;
XDELETEVEC (to_free);
to_free = next;
}
}
/* Allocate a chunk for obstack. Use the pool if requested chunk size matches
the size of blocks in the pool. */
void *
mempool_obstack_chunk_alloc (size_t size)
{
if (size == memory_block_pool::block_size)
return memory_block_pool::allocate ();
else
return XNEWVEC (char, size);
}
/* Free previously allocated obstack chunk. */
void
mempool_obstack_chunk_free (void *chunk)
{
size_t size = (reinterpret_cast<_obstack_chunk *> (chunk)->limit
- reinterpret_cast<char *> (chunk));
if (size == memory_block_pool::block_size)
memory_block_pool::release (chunk);
else
XDELETEVEC (chunk);
}
/* Return allocated memory back to malloc (and to system). */
void
memory_block_pool::trim (int num)
{
instance.reduce_free_list (num);
}
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