| /* Shared pool of memory blocks for pool allocators. |
| Copyright (C) 2015-2020 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); |
| } |