117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
|
|
* This file is part of 0 A.D.
|
|
*
|
|
* 0 A.D. 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* pool allocator
|
|
*/
|
|
|
|
#include "precompiled.h"
|
|
#include "pool.h"
|
|
|
|
#include "mem_util.h"
|
|
|
|
|
|
LibError pool_create(Pool* p, size_t max_size, size_t el_size)
|
|
{
|
|
if(el_size == POOL_VARIABLE_ALLOCS)
|
|
p->el_size = 0;
|
|
else
|
|
p->el_size = mem_RoundUpToAlignment(el_size);
|
|
p->freelist = 0;
|
|
RETURN_ERR(da_alloc(&p->da, max_size));
|
|
return INFO::OK;
|
|
}
|
|
|
|
|
|
LibError pool_destroy(Pool* p)
|
|
{
|
|
// don't be picky and complain if the freelist isn't empty;
|
|
// we don't care since it's all part of the da anyway.
|
|
// however, zero it to prevent further allocs from succeeding.
|
|
p->freelist = 0;
|
|
return da_free(&p->da);
|
|
}
|
|
|
|
|
|
bool pool_contains(const Pool* p, void* el)
|
|
{
|
|
// outside of our range
|
|
if(!(p->da.base <= el && el < p->da.base+p->da.pos))
|
|
return false;
|
|
// sanity check: it should be aligned (if pool has fixed-size elements)
|
|
if(p->el_size)
|
|
debug_assert((uintptr_t)((u8*)el - p->da.base) % p->el_size == 0);
|
|
return true;
|
|
}
|
|
|
|
|
|
void* pool_alloc(Pool* p, size_t size)
|
|
{
|
|
// if pool allows variable sizes, go with the size parameter,
|
|
// otherwise the pool el_size setting.
|
|
const size_t el_size = p->el_size? p->el_size : mem_RoundUpToAlignment(size);
|
|
|
|
// note: this can never happen in pools with variable-sized elements
|
|
// because they disallow pool_free.
|
|
void* el = mem_freelist_Detach(p->freelist);
|
|
if(el)
|
|
goto have_el;
|
|
|
|
// alloc a new entry
|
|
{
|
|
// expand, if necessary
|
|
if(da_reserve(&p->da, el_size) < 0)
|
|
return 0;
|
|
|
|
el = p->da.base + p->da.pos;
|
|
p->da.pos += el_size;
|
|
}
|
|
|
|
have_el:
|
|
debug_assert(pool_contains(p, el)); // paranoia
|
|
return el;
|
|
}
|
|
|
|
|
|
void pool_free(Pool* p, void* el)
|
|
{
|
|
// only allowed to free items if we were initialized with
|
|
// fixed el_size. (this avoids having to pass el_size here and
|
|
// check if requested_size matches that when allocating)
|
|
if(p->el_size == 0)
|
|
{
|
|
debug_assert(0); // cannot free variable-size items
|
|
return;
|
|
}
|
|
|
|
if(pool_contains(p, el))
|
|
mem_freelist_AddToFront(p->freelist, el);
|
|
else
|
|
debug_assert(0); // invalid pointer (not in pool)
|
|
}
|
|
|
|
|
|
void pool_free_all(Pool* p)
|
|
{
|
|
p->freelist = 0;
|
|
|
|
// must be reset before da_set_size or CHECK_DA will complain.
|
|
p->da.pos = 0;
|
|
|
|
da_set_size(&p->da, 0);
|
|
}
|