1*38fd1498Szrj /* Shared pool of memory blocks for pool allocators. 2*38fd1498Szrj Copyright (C) 2015-2018 Free Software Foundation, Inc. 3*38fd1498Szrj 4*38fd1498Szrj This file is part of GCC. 5*38fd1498Szrj 6*38fd1498Szrj GCC is free software; you can redistribute it and/or modify 7*38fd1498Szrj it under the terms of the GNU General Public License as published by 8*38fd1498Szrj the Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj any later version. 10*38fd1498Szrj 11*38fd1498Szrj GCC is distributed in the hope that it will be useful, 12*38fd1498Szrj but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj You should have received a copy of the GNU General Public License 17*38fd1498Szrj along with GCC; see the file COPYING3. If not see 18*38fd1498Szrj <http://www.gnu.org/licenses/>. */ 19*38fd1498Szrj 20*38fd1498Szrj 21*38fd1498Szrj #ifndef MEMORY_BLOCK_H 22*38fd1498Szrj #define MEMORY_BLOCK_H 23*38fd1498Szrj 24*38fd1498Szrj /* Shared pool which allows other memory pools to reuse each others' allocated 25*38fd1498Szrj memory blocks instead of calling free/malloc again. */ 26*38fd1498Szrj class memory_block_pool 27*38fd1498Szrj { 28*38fd1498Szrj public: 29*38fd1498Szrj /* Blocks have fixed size. This is necessary for sharing. */ 30*38fd1498Szrj static const size_t block_size = 64 * 1024; 31*38fd1498Szrj 32*38fd1498Szrj memory_block_pool (); 33*38fd1498Szrj 34*38fd1498Szrj static inline void *allocate () ATTRIBUTE_MALLOC; 35*38fd1498Szrj static inline void release (void *); 36*38fd1498Szrj void clear_free_list (); 37*38fd1498Szrj 38*38fd1498Szrj private: 39*38fd1498Szrj /* memory_block_pool singleton instance, defined in memory-block.cc. */ 40*38fd1498Szrj static memory_block_pool instance; 41*38fd1498Szrj 42*38fd1498Szrj struct block_list 43*38fd1498Szrj { 44*38fd1498Szrj block_list *m_next; 45*38fd1498Szrj }; 46*38fd1498Szrj 47*38fd1498Szrj /* Free list. */ 48*38fd1498Szrj block_list *m_blocks; 49*38fd1498Szrj }; 50*38fd1498Szrj 51*38fd1498Szrj /* Allocate a single block. Reuse a previously returned block, if possible. */ 52*38fd1498Szrj inline void * allocate()53*38fd1498Szrjmemory_block_pool::allocate () 54*38fd1498Szrj { 55*38fd1498Szrj if (instance.m_blocks == NULL) 56*38fd1498Szrj return XNEWVEC (char, block_size); 57*38fd1498Szrj 58*38fd1498Szrj void *result = instance.m_blocks; 59*38fd1498Szrj instance.m_blocks = instance.m_blocks->m_next; 60*38fd1498Szrj VALGRIND_DISCARD (VALGRIND_MAKE_MEM_UNDEFINED (result, block_size)); 61*38fd1498Szrj return result; 62*38fd1498Szrj } 63*38fd1498Szrj 64*38fd1498Szrj /* Return UNCAST_BLOCK to the pool. */ 65*38fd1498Szrj inline void release(void * uncast_block)66*38fd1498Szrjmemory_block_pool::release (void *uncast_block) 67*38fd1498Szrj { 68*38fd1498Szrj block_list *block = new (uncast_block) block_list; 69*38fd1498Szrj block->m_next = instance.m_blocks; 70*38fd1498Szrj instance.m_blocks = block; 71*38fd1498Szrj } 72*38fd1498Szrj 73*38fd1498Szrj extern void *mempool_obstack_chunk_alloc (size_t) ATTRIBUTE_MALLOC; 74*38fd1498Szrj extern void mempool_obstack_chunk_free (void *); 75*38fd1498Szrj 76*38fd1498Szrj #endif /* MEMORY_BLOCK_H */ 77