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215 lines
7.8 KiB
C
215 lines
7.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape Portable Runtime (NSPR).
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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*/
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#ifndef plarena_h___
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#define plarena_h___
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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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* Also supports LIFO allocation (PL_ARENA_MARK/PL_ARENA_RELEASE).
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*/
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#include "prtypes.h"
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#include "plarenas.h"
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PR_BEGIN_EXTERN_C
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typedef struct PLArena PLArena;
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struct PLArena {
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PLArena *next; /* next arena for this lifetime */
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PRUword base; /* aligned base address, follows this header */
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PRUword limit; /* one beyond last byte in arena */
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PRUword avail; /* points to next available byte */
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};
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#ifdef PL_ARENAMETER
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typedef struct PLArenaStats PLArenaStats;
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struct PLArenaStats {
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PLArenaStats *next; /* next in arenaStats list */
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char *name; /* name for debugging */
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PRUint32 narenas; /* number of arenas in pool */
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PRUint32 nallocs; /* number of PL_ARENA_ALLOCATE() calls */
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PRUint32 nreclaims; /* number of reclaims from freeArenas */
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PRUint32 nmallocs; /* number of malloc() calls */
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PRUint32 ndeallocs; /* number of lifetime deallocations */
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PRUint32 ngrows; /* number of PL_ARENA_GROW() calls */
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PRUint32 ninplace; /* number of in-place growths */
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PRUint32 nreleases; /* number of PL_ARENA_RELEASE() calls */
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PRUint32 nfastrels; /* number of "fast path" releases */
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PRUint32 nbytes; /* total bytes allocated */
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PRUint32 maxalloc; /* maximum allocation size in bytes */
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PRFloat64 variance; /* size variance accumulator */
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};
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#endif
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struct PLArenaPool {
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PLArena first; /* first arena in pool list */
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PLArena *current; /* arena from which to allocate space */
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PRUint32 arenasize; /* net exact size of a new arena */
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PRUword mask; /* alignment mask (power-of-2 - 1) */
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#ifdef PL_ARENAMETER
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PLArenaStats stats;
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#endif
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};
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/*
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* If the including .c file uses only one power-of-2 alignment, it may define
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* PL_ARENA_CONST_ALIGN_MASK to the alignment mask and save a few instructions
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* per ALLOCATE and GROW.
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*/
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#ifdef PL_ARENA_CONST_ALIGN_MASK
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#define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + PL_ARENA_CONST_ALIGN_MASK) \
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& ~PL_ARENA_CONST_ALIGN_MASK)
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#define PL_INIT_ARENA_POOL(pool, name, size) \
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PL_InitArenaPool(pool, name, size, PL_ARENA_CONST_ALIGN_MASK + 1)
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#else
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#define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + (pool)->mask) & ~(pool)->mask)
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#endif
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#define PL_ARENA_ALLOCATE(p, pool, nb) \
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PR_BEGIN_MACRO \
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PLArena *_a = (pool)->current; \
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PRUint32 _nb = PL_ARENA_ALIGN(pool, nb); \
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PRUword _p = _a->avail; \
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PRUword _q = _p + _nb; \
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if (_q > _a->limit) \
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_p = (PRUword)PL_ArenaAllocate(pool, _nb); \
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else \
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_a->avail = _q; \
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p = (void *)_p; \
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PL_ArenaCountAllocation(pool, nb); \
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PR_END_MACRO
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#define PL_ARENA_GROW(p, pool, size, incr) \
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PR_BEGIN_MACRO \
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PLArena *_a = (pool)->current; \
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PRUint32 _incr = PL_ARENA_ALIGN(pool, incr); \
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PRUword _p = _a->avail; \
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PRUword _q = _p + _incr; \
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if (_p == (PRUword)(p) + PL_ARENA_ALIGN(pool, size) && \
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_q <= _a->limit) { \
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_a->avail = _q; \
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PL_ArenaCountInplaceGrowth(pool, size, incr); \
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} else { \
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p = PL_ArenaGrow(pool, p, size, incr); \
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} \
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PL_ArenaCountGrowth(pool, size, incr); \
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PR_END_MACRO
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#define PL_ARENA_MARK(pool) ((void *) (pool)->current->avail)
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#define PR_UPTRDIFF(p,q) ((PRUword)(p) - (PRUword)(q))
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#define PL_CLEAR_UNUSED_PATTERN(a, pattern) \
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(PR_ASSERT((a)->avail <= (a)->limit), \
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memset((void*)(a)->avail, (pattern), (a)->limit - (a)->avail))
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#ifdef DEBUG
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#define PL_FREE_PATTERN 0xDA
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#define PL_CLEAR_UNUSED(a) PL_CLEAR_UNUSED_PATTERN((a), PL_FREE_PATTERN)
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#define PL_CLEAR_ARENA(a) memset((void*)(a), PL_FREE_PATTERN, \
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(a)->limit - (PRUword)(a))
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#else
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#define PL_CLEAR_UNUSED(a)
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#define PL_CLEAR_ARENA(a)
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#endif
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#define PL_ARENA_RELEASE(pool, mark) \
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PR_BEGIN_MACRO \
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char *_m = (char *)(mark); \
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PLArena *_a = (pool)->current; \
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if (PR_UPTRDIFF(_m, _a->base) <= PR_UPTRDIFF(_a->avail, _a->base)) { \
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_a->avail = (PRUword)PL_ARENA_ALIGN(pool, _m); \
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PL_CLEAR_UNUSED(_a); \
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PL_ArenaCountRetract(pool, _m); \
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} else { \
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PL_ArenaRelease(pool, _m); \
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} \
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PL_ArenaCountRelease(pool, _m); \
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PR_END_MACRO
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#ifdef PL_ARENAMETER
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#define PL_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
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#else
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#define PL_COUNT_ARENA(pool,op)
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#endif
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#define PL_ARENA_DESTROY(pool, a, pnext) \
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PR_BEGIN_MACRO \
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PL_COUNT_ARENA(pool,--); \
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if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
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*(pnext) = (a)->next; \
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PL_CLEAR_ARENA(a); \
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free(a); \
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(a) = 0; \
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PR_END_MACRO
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#ifdef PL_ARENAMETER
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#include <stdio.h>
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PR_EXTERN(void) PL_ArenaCountAllocation(PLArenaPool *pool, PRUint32 nb);
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PR_EXTERN(void) PL_ArenaCountInplaceGrowth(
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PLArenaPool *pool, PRUint32 size, PRUint32 incr);
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PR_EXTERN(void) PL_ArenaCountGrowth(
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PLArenaPool *pool, PRUint32 size, PRUint32 incr);
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PR_EXTERN(void) PL_ArenaCountRelease(PLArenaPool *pool, char *mark);
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PR_EXTERN(void) PL_ArenaCountRetract(PLArenaPool *pool, char *mark);
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PR_EXTERN(void) PL_DumpArenaStats(FILE *fp);
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#else /* !PL_ARENAMETER */
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#define PL_ArenaCountAllocation(ap, nb) /* nothing */
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#define PL_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
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#define PL_ArenaCountGrowth(ap, size, incr) /* nothing */
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#define PL_ArenaCountRelease(ap, mark) /* nothing */
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#define PL_ArenaCountRetract(ap, mark) /* nothing */
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#endif /* !PL_ARENAMETER */
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PR_END_EXTERN_C
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#endif /* plarena_h___ */
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