зеркало из https://github.com/mozilla/pjs.git
243 строки
9.6 KiB
C
243 строки
9.6 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef prarena_h___
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#define prarena_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 (PR_ARENA_MARK/PR_ARENA_RELEASE).
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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struct PRArena {
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PRArena *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 PR_ARENAMETER
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typedef struct PRArenaStats PRArenaStats;
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struct PRArenaStats {
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PRArenaStats *next; /* next in arenaStats list */
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char *name; /* name for debugging */
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uint32 narenas; /* number of arenas in pool */
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uint32 nallocs; /* number of PR_ARENA_ALLOCATE() calls */
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uint32 nreclaims; /* number of reclaims from freeArenas */
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uint32 nmallocs; /* number of malloc() calls */
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uint32 ndeallocs; /* number of lifetime deallocations */
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uint32 ngrows; /* number of PR_ARENA_GROW() calls */
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uint32 ninplace; /* number of in-place growths */
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uint32 nreleases; /* number of PR_ARENA_RELEASE() calls */
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uint32 nfastrels; /* number of "fast path" releases */
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size_t nbytes; /* total bytes allocated */
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size_t maxalloc; /* maximum allocation size in bytes */
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double variance; /* size variance accumulator */
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};
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#endif
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struct PRArenaPool {
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PRArena first; /* first arena in pool list */
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PRArena *current; /* arena from which to allocate space */
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size_t 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 PR_ARENAMETER
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PRArenaStats 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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* PR_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 PR_ARENA_CONST_ALIGN_MASK
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#define PR_ARENA_ALIGN(pool, n) (((pruword)(n) + PR_ARENA_CONST_ALIGN_MASK) \
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& ~PR_ARENA_CONST_ALIGN_MASK)
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#define PR_INIT_ARENA_POOL(pool, name, size) \
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PR_InitArenaPool(pool, name, size, PR_ARENA_CONST_ALIGN_MASK + 1)
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#else
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#define PR_ARENA_ALIGN(pool, n) (((pruword)(n) + (pool)->mask) & ~(pool)->mask)
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#endif
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#define PR_ARENA_ALLOCATE(p, pool, nb) \
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PR_BEGIN_MACRO \
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PRArena *_a = (pool)->current; \
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size_t _nb = PR_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)PR_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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PR_ArenaCountAllocation(pool, nb); \
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PR_END_MACRO
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#define PR_ARENA_GROW(p, pool, size, incr) \
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PR_BEGIN_MACRO \
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PRArena *_a = (pool)->current; \
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size_t _incr = PR_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) + PR_ARENA_ALIGN(pool, size) && \
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_q <= _a->limit) { \
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_a->avail = _q; \
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PR_ArenaCountInplaceGrowth(pool, size, incr); \
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} else { \
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p = PR_ArenaGrow(pool, p, size, incr); \
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} \
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PR_ArenaCountGrowth(pool, size, incr); \
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PR_END_MACRO
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#define PR_ARENA_MARK(pool) ((void *) (pool)->current->avail)
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#define PR_UPTRDIFF(p,q) ((pruword)(p) - (pruword)(q))
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#ifdef DEBUG
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#define PR_FREE_PATTERN 0xDA
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#define PR_CLEAR_UNUSED(a) (PR_ASSERT((a)->avail <= (a)->limit), \
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memset((void*)(a)->avail, PR_FREE_PATTERN, \
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(a)->limit - (a)->avail))
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#define PR_CLEAR_ARENA(a) memset((void*)(a), PR_FREE_PATTERN, \
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(a)->limit - (pruword)(a))
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#else
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#define PR_CLEAR_UNUSED(a) /* nothing */
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#define PR_CLEAR_ARENA(a) /* nothing */
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#endif
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#define PR_ARENA_RELEASE(pool, mark) \
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PR_BEGIN_MACRO \
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char *_m = (char *)(mark); \
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PRArena *_a = (pool)->current; \
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if (PR_UPTRDIFF(_m, _a) <= PR_UPTRDIFF(_a->avail, _a)) { \
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_a->avail = (pruword)PR_ARENA_ALIGN(pool, _m); \
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PR_CLEAR_UNUSED(_a); \
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PR_ArenaCountRetract(pool, _m); \
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} else { \
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PR_ArenaRelease(pool, _m); \
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} \
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PR_ArenaCountRelease(pool, _m); \
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PR_END_MACRO
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#ifdef PR_ARENAMETER
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#define PR_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
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#else
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#define PR_COUNT_ARENA(pool,op)
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#endif
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#define PR_ARENA_DESTROY(pool, a, pnext) \
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PR_BEGIN_MACRO \
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PR_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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PR_CLEAR_ARENA(a); \
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free(a); \
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(a) = NULL; \
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PR_END_MACRO
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/*
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* Initialize an arena pool with the given name for debugging and metering,
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* with a minimum size per arena of size bytes.
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*/
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extern PR_PUBLIC_API(void)
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PR_InitArenaPool(PRArenaPool *pool, const char *name, PRUint32 size,
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PRUint32 align);
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/*
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* Free the arenas in pool. The user may continue to allocate from pool
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* after calling this function. There is no need to call PR_InitArenaPool()
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* again unless PR_FinishArenaPool(pool) has been called.
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*/
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extern PR_PUBLIC_API(void)
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PR_FreeArenaPool(PRArenaPool *pool);
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/*
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* Free the arenas in pool and finish using it altogether.
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*/
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extern PR_PUBLIC_API(void)
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PR_FinishArenaPool(PRArenaPool *pool);
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/*
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* Compact all of the arenas in a pool so that no space is wasted.
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*/
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extern PR_PUBLIC_API(void)
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PR_CompactArenaPool(PRArenaPool *pool);
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/*
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* Finish using arenas, freeing all memory associated with them.
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*/
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extern PR_PUBLIC_API(void)
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PR_ArenaFinish(void);
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/*
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* Friend functions used by the PR_ARENA_*() macros.
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*/
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extern PR_PUBLIC_API(void *)
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PR_ArenaAllocate(PRArenaPool *pool, PRUint32 nb);
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extern PR_PUBLIC_API(void *)
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PR_ArenaGrow(PRArenaPool *pool, void *p, PRUint32 size, PRUint32 incr);
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extern PR_PUBLIC_API(void)
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PR_ArenaRelease(PRArenaPool *pool, char *mark);
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#ifdef PR_ARENAMETER
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#include <stdio.h>
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extern PR_PUBLIC_API(void)
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PR_ArenaCountAllocation(PRArenaPool *pool, PRUint32 nb);
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extern PR_PUBLIC_API(void)
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PR_ArenaCountInplaceGrowth(PRArenaPool *pool, PRUint32 size, PRUint32 incr);
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extern PR_PUBLIC_API(void)
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PR_ArenaCountGrowth(PRArenaPool *pool, PRUint32 size, PRUint32incr);
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extern PR_PUBLIC_API(void)
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PR_ArenaCountRelease(PRArenaPool *pool, char *mark);
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extern PR_PUBLIC_API(void)
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PR_ArenaCountRetract(PRArenaPool *pool, char *mark);
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extern PR_PUBLIC_API(void)
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PR_DumpArenaStats(FILE *fp);
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#else /* !PR_ARENAMETER */
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#define PR_ArenaCountAllocation(ap, nb) /* nothing */
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#define PR_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
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#define PR_ArenaCountGrowth(ap, size, incr) /* nothing */
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#define PR_ArenaCountRelease(ap, mark) /* nothing */
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#define PR_ArenaCountRetract(ap, mark) /* nothing */
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#endif /* !PR_ARENAMETER */
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PR_END_EXTERN_C
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#endif /* prarena_h___ */
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