author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 17:13:44 +0300 | |
branch | RCL_3 |
changeset 70 | 8bfb9186a8b8 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 1998-2000 Netscape Communications Corporation. |
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* Copyright (C) 2003-6 Apple Computer |
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* |
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* Other contributors: |
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* Nick Blievers <nickb@adacel.com.au> |
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* Jeff Hostetler <jeff@nerdone.com> |
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* Tom Rini <trini@kernel.crashing.org> |
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* Raffaele Sena <raff@netwinder.org> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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* Alternatively, the contents of this file may be used under the terms |
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* of either the Mozilla Public License Version 1.1, found at |
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* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public |
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* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html |
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* (the "GPL"), in which case the provisions of the MPL or the GPL are |
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* applicable instead of those above. If you wish to allow use of your |
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* version of this file only under the terms of one of those two |
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* licenses (the MPL or the GPL) and not to allow others to use your |
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* version of this file under the LGPL, indicate your decision by |
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* deletingthe provisions above and replace them with the notice and |
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* other provisions required by the MPL or the GPL, as the case may be. |
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* If you do not delete the provisions above, a recipient may use your |
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* version of this file under any of the LGPL, the MPL or the GPL. |
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*/ |
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|
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/* |
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* Lifetime-based fast allocation, inspired by much prior art, including |
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* "Fast Allocation and Deallocation of Memory Based on Object Lifetimes" |
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* David R. Hanson, Software -- Practice and Experience, Vol. 20(1). |
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*/ |
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#include "config.h" |
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#include "Arena.h" |
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#include <algorithm> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <wtf/Assertions.h> |
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#include <wtf/FastMalloc.h> |
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using namespace std; |
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namespace WebCore { |
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//#define DEBUG_ARENA_MALLOC |
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#ifdef DEBUG_ARENA_MALLOC |
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static int i = 0; |
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#endif |
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#define FREELIST_MAX 30 |
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static Arena *arena_freelist; |
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static int freelist_count = 0; |
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#define ARENA_DEFAULT_ALIGN sizeof(double) |
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#define BIT(n) ((unsigned int)1 << (n)) |
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#define BITMASK(n) (BIT(n) - 1) |
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#define CEILING_LOG2(_log2,_n) \ |
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unsigned int j_ = (unsigned int)(_n); \ |
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(_log2) = 0; \ |
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if ((j_) & ((j_)-1)) \ |
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(_log2) += 1; \ |
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if ((j_) >> 16) \ |
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(_log2) += 16, (j_) >>= 16; \ |
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if ((j_) >> 8) \ |
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(_log2) += 8, (j_) >>= 8; \ |
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if ((j_) >> 4) \ |
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(_log2) += 4, (j_) >>= 4; \ |
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if ((j_) >> 2) \ |
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(_log2) += 2, (j_) >>= 2; \ |
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if ((j_) >> 1) \ |
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(_log2) += 1; |
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static int CeilingLog2(unsigned int i) { |
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int log2; |
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CEILING_LOG2(log2,i); |
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return log2; |
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} |
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void InitArenaPool(ArenaPool *pool, const char *name, |
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unsigned int size, unsigned int align) |
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{ |
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if (align == 0) |
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align = ARENA_DEFAULT_ALIGN; |
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pool->mask = BITMASK(CeilingLog2(align)); |
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pool->first.next = NULL; |
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pool->first.base = pool->first.avail = pool->first.limit = |
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(uword)ARENA_ALIGN(pool, &pool->first + 1); |
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pool->current = &pool->first; |
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pool->arenasize = size; |
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} |
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106 |
|
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/* |
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** ArenaAllocate() -- allocate space from an arena pool |
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** |
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** Description: ArenaAllocate() allocates space from an arena |
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** pool. |
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** |
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** First try to satisfy the request from arenas starting at |
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** pool->current. |
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** |
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** If there is not enough space in the arena pool->current, try |
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** to claim an arena, on a first fit basis, from the global |
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** freelist (arena_freelist). |
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** |
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** If no arena in arena_freelist is suitable, then try to |
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** allocate a new arena from the heap. |
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** |
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** Returns: pointer to allocated space or NULL |
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** |
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*/ |
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void* ArenaAllocate(ArenaPool *pool, unsigned int nb) |
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127 |
{ |
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Arena *a; |
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char *rp; /* returned pointer */ |
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130 |
|
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ASSERT((nb & pool->mask) == 0); |
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132 |
|
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nb = (uword)ARENA_ALIGN(pool, nb); /* force alignment */ |
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134 |
|
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/* attempt to allocate from arenas at pool->current */ |
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136 |
{ |
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a = pool->current; |
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138 |
do { |
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if ( a->avail +nb <= a->limit ) { |
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pool->current = a; |
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rp = (char *)a->avail; |
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a->avail += nb; |
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143 |
return rp; |
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144 |
} |
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} while( NULL != (a = a->next) ); |
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146 |
} |
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147 |
|
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/* attempt to allocate from arena_freelist */ |
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149 |
{ |
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Arena *p = NULL; /* previous pointer, for unlinking from freelist */ |
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151 |
|
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for ( a = arena_freelist; a != NULL ; p = a, a = a->next ) { |
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if ( a->base +nb <= a->limit ) { |
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154 |
if ( p == NULL ) |
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arena_freelist = a->next; |
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156 |
else |
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p->next = a->next; |
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a->avail = a->base; |
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rp = (char *)a->avail; |
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a->avail += nb; |
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/* the newly allocated arena is linked after pool->current |
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* and becomes pool->current */ |
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a->next = pool->current->next; |
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pool->current->next = a; |
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pool->current = a; |
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if ( 0 == pool->first.next ) |
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pool->first.next = a; |
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freelist_count--; |
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169 |
return(rp); |
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170 |
} |
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171 |
} |
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172 |
} |
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173 |
|
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/* attempt to allocate from the heap */ |
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175 |
{ |
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176 |
unsigned int sz = max(pool->arenasize, nb); |
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sz += sizeof *a + pool->mask; /* header and alignment slop */ |
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#ifdef DEBUG_ARENA_MALLOC |
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i++; |
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printf("Malloc: %d\n", i); |
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#endif |
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a = (Arena*)fastMalloc(sz); |
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183 |
if (a) { |
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a->limit = (uword)a + sz; |
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a->base = a->avail = (uword)ARENA_ALIGN(pool, a + 1); |
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186 |
rp = (char *)a->avail; |
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a->avail += nb; |
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/* the newly allocated arena is linked after pool->current |
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* and becomes pool->current */ |
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a->next = pool->current->next; |
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pool->current->next = a; |
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pool->current = a; |
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if ( !pool->first.next ) |
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pool->first.next = a; |
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195 |
return(rp); |
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196 |
} |
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197 |
} |
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198 |
|
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199 |
/* we got to here, and there's no memory to allocate */ |
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200 |
return(0); |
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201 |
} /* --- end ArenaAllocate() --- */ |
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202 |
|
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203 |
void* ArenaGrow(ArenaPool *pool, void *p, unsigned int size, unsigned int incr) |
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204 |
{ |
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205 |
void *newp; |
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206 |
|
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207 |
ARENA_ALLOCATE(newp, pool, size + incr); |
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208 |
if (newp) |
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memcpy(newp, p, size); |
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return newp; |
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211 |
} |
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212 |
|
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213 |
/* |
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214 |
* Free tail arenas linked after head, which may not be the true list head. |
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215 |
* Reset pool->current to point to head in case it pointed at a tail arena. |
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*/ |
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static void FreeArenaList(ArenaPool *pool, Arena *head, bool reallyFree) |
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{ |
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Arena **ap, *a; |
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|
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ap = &head->next; |
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a = *ap; |
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if (!a) |
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return; |
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|
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#ifdef DEBUG |
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do { |
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ASSERT(a->base <= a->avail && a->avail <= a->limit); |
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a->avail = a->base; |
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CLEAR_UNUSED(a); |
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} while ((a = a->next) != 0); |
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a = *ap; |
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#endif |
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|
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if (freelist_count >= FREELIST_MAX) |
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reallyFree = true; |
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|
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if (reallyFree) { |
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do { |
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*ap = a->next; |
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CLEAR_ARENA(a); |
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#ifdef DEBUG_ARENA_MALLOC |
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if (a) { |
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i--; |
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printf("Free: %d\n", i); |
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} |
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#endif |
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fastFree(a); a = 0; |
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} while ((a = *ap) != 0); |
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} else { |
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/* Insert the whole arena chain at the front of the freelist. */ |
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do { |
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ap = &(*ap)->next; |
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freelist_count++; |
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} while (*ap); |
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*ap = arena_freelist; |
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arena_freelist = a; |
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head->next = 0; |
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} |
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pool->current = head; |
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} |
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|
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void ArenaRelease(ArenaPool *pool, char *mark) |
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{ |
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Arena *a; |
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|
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for (a = pool->first.next; a; a = a->next) { |
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if (UPTRDIFF(mark, a->base) < UPTRDIFF(a->avail, a->base)) { |
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a->avail = (uword)ARENA_ALIGN(pool, mark); |
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FreeArenaList(pool, a, false); |
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return; |
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} |
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} |
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} |
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|
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void FreeArenaPool(ArenaPool *pool) |
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{ |
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FreeArenaList(pool, &pool->first, false); |
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} |
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|
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void FinishArenaPool(ArenaPool *pool) |
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{ |
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FreeArenaList(pool, &pool->first, true); |
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} |
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|
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} |