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1dc6c44d | 1 | /* Shared pool of memory blocks for pool allocators. |
fbd26352 | 2 | Copyright (C) 2015-2019 Free Software Foundation, Inc. |
1dc6c44d | 3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along 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. */ | |
27 | memory_block_pool memory_block_pool::instance; | |
28 | ||
29 | memory_block_pool::memory_block_pool () : m_blocks (NULL) {} | |
30 | ||
31 | /* Return all blocks from free list to the OS. */ | |
32 | void | |
33 | memory_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. */ | |
45 | void * | |
46 | mempool_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. */ | |
55 | void | |
56 | mempool_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 | } |