1/* Shared pool of memory blocks for pool allocators.
2 Copyright (C) 2015-2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20#include "config.h"
21#include "system.h"
22#include "coretypes.h"
23#include "memory-block.h"
24#include "obstack.h"
25
26/* Global singleton-like instance. */
27memory_block_pool memory_block_pool::instance;
28
29memory_block_pool::memory_block_pool () : m_blocks (NULL) {}
30
31/* Return all blocks from free list to the OS. */
32void
33memory_block_pool::clear_free_list ()
34{
35 while (m_blocks)
36 {
37 block_list *next = m_blocks->m_next;
38 XDELETEVEC (m_blocks);
39 m_blocks = next;
40 }
41}
42
43/* Allocate a chunk for obstack. Use the pool if requested chunk size matches
44 the size of blocks in the pool. */
45void *
46mempool_obstack_chunk_alloc (size_t size)
47{
48 if (size == memory_block_pool::block_size)
49 return memory_block_pool::allocate ();
50 else
51 return XNEWVEC (char, size);
52}
53
54/* Free previously allocated obstack chunk. */
55void
56mempool_obstack_chunk_free (void *chunk)
57{
58 size_t size = (reinterpret_cast<_obstack_chunk *> (chunk)->limit
59 - reinterpret_cast<char *> (chunk));
60 if (size == memory_block_pool::block_size)
61 memory_block_pool::release (chunk);
62 else
63 XDELETEVEC (chunk);
64}
65