+++ /dev/null
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/*
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape Portable Runtime (NSPR).
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1998-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
-
-#ifndef plarena_h___
-#define plarena_h___
-/*
- * Lifetime-based fast allocation, inspired by much prior art, including
- * "Fast Allocation and Deallocation of Memory Based on Object Lifetimes"
- * David R. Hanson, Software -- Practice and Experience, Vol. 20(1).
- *
- * Also supports LIFO allocation (PL_ARENA_MARK/PL_ARENA_RELEASE).
- */
-#include "prtypes.h"
-#include "plarenas.h"
-
-PR_BEGIN_EXTERN_C
-
-typedef struct PLArena PLArena;
-
-struct PLArena {
- PLArena *next; /* next arena for this lifetime */
- PRUword base; /* aligned base address, follows this header */
- PRUword limit; /* one beyond last byte in arena */
- PRUword avail; /* points to next available byte */
-};
-
-#ifdef PL_ARENAMETER
-typedef struct PLArenaStats PLArenaStats;
-
-struct PLArenaStats {
- PLArenaStats *next; /* next in arenaStats list */
- char *name; /* name for debugging */
- PRUint32 narenas; /* number of arenas in pool */
- PRUint32 nallocs; /* number of PL_ARENA_ALLOCATE() calls */
- PRUint32 nreclaims; /* number of reclaims from freeArenas */
- PRUint32 nmallocs; /* number of malloc() calls */
- PRUint32 ndeallocs; /* number of lifetime deallocations */
- PRUint32 ngrows; /* number of PL_ARENA_GROW() calls */
- PRUint32 ninplace; /* number of in-place growths */
- PRUint32 nreleases; /* number of PL_ARENA_RELEASE() calls */
- PRUint32 nfastrels; /* number of "fast path" releases */
- PRUint32 nbytes; /* total bytes allocated */
- PRUint32 maxalloc; /* maximum allocation size in bytes */
- PRFloat64 variance; /* size variance accumulator */
-};
-#endif
-
-struct PLArenaPool {
- PLArena first; /* first arena in pool list */
- PLArena *current; /* arena from which to allocate space */
- PRSize arenasize; /* net exact size of a new arena */
- PRUword mask; /* alignment mask (power-of-2 - 1) */
-#ifdef PL_ARENAMETER
- PLArenaStats stats;
-#endif
-};
-
-/*
- * If the including .c file uses only one power-of-2 alignment, it may define
- * PL_ARENA_CONST_ALIGN_MASK to the alignment mask and save a few instructions
- * per ALLOCATE and GROW.
- */
-#ifdef PL_ARENA_CONST_ALIGN_MASK
-#define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + PL_ARENA_CONST_ALIGN_MASK) \
- & ~PL_ARENA_CONST_ALIGN_MASK)
-
-#define PL_INIT_ARENA_POOL(pool, name, size) \
- PL_InitArenaPool(pool, name, size, PL_ARENA_CONST_ALIGN_MASK + 1)
-#else
-#define PL_ARENA_ALIGN(pool, n) (typeof(n))(((PRUword)(n) + (pool)->mask) & ~(pool)->mask)
-#endif
-
-#define PL_ARENA_ALLOCATE(p, pool, nb) \
- PR_BEGIN_MACRO \
- PLArena *_a = (pool)->current; \
- PRUint32 _nb = PL_ARENA_ALIGN(pool, nb); \
- PRUword _p = _a->avail; \
- PRUword _q = _p + _nb; \
- if (_q > _a->limit) \
- _p = (PRUword)PL_ArenaAllocate(pool, _nb); \
- else \
- _a->avail = _q; \
- p = (void *)_p; \
- PL_ArenaCountAllocation(pool, nb); \
- PR_END_MACRO
-
-#define PL_ARENA_GROW(p, pool, size, incr) \
- PR_BEGIN_MACRO \
- PLArena *_a = (pool)->current; \
- PRUword _p = _a->avail; \
- PRUword _q = (PRUword)p + size + incr; \
- if (_p == (PRUword)(p) + PL_ARENA_ALIGN(pool, size) && \
- _q <= _a->limit) { \
- _a->avail = PL_ARENA_ALIGN(pool, _q); \
- PL_ArenaCountInplaceGrowth(pool, size, incr); \
- } else { \
- p = PL_ArenaGrow(pool, p, size, incr); \
- } \
- PL_ArenaCountGrowth(pool, size, incr); \
- PR_END_MACRO
-
-#define PL_ARENA_MARK(pool) ((void *) (pool)->current->avail)
-#define PR_UPTRDIFF(p,q) ((PRUword)(p) - (PRUword)(q))
-
-#ifdef DEBUG
-#define PL_FREE_PATTERN 0xDA
-#define PL_CLEAR_UNUSED(a) (PR_ASSERT((a)->avail <= (a)->limit), \
- memset((void*)(a)->avail, PL_FREE_PATTERN, \
- (a)->limit - (a)->avail))
-#define PL_CLEAR_ARENA(a) memset((void*)(a), PL_FREE_PATTERN, \
- (a)->limit - (PRUword)(a))
-#else
-#define PL_CLEAR_UNUSED(a)
-#define PL_CLEAR_ARENA(a)
-#endif
-
-#if ARENA_MARK_ENABLE
-
-#define PL_ARENA_RELEASE(pool, mark) \
- PR_BEGIN_MACRO \
- char *_m = (char *)(mark); \
- PLArena *_a = (pool)->current; \
- if (PR_UPTRDIFF(_m, _a->base) <= PR_UPTRDIFF(_a->avail, _a->base)) { \
- _a->avail = (PRUword)PL_ARENA_ALIGN(pool, _m); \
- PL_CLEAR_UNUSED(_a); \
- PL_ArenaCountRetract(pool, _m); \
- } else { \
- PL_ArenaRelease(pool, _m); \
- } \
- PL_ArenaCountRelease(pool, _m); \
- PR_END_MACRO
-
-#else /* !ARENA_MARK_ENABLE */
-
-#define PL_ARENA_RELEASE(pool, mark)
-
-#endif /* ARENA_MARK_ENABLE */
-
-#ifdef PL_ARENAMETER
-#define PL_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
-#else
-#define PL_COUNT_ARENA(pool,op)
-#endif
-
-#define PL_ARENA_DESTROY(pool, a, pnext) \
- PR_BEGIN_MACRO \
- PL_COUNT_ARENA(pool,--); \
- if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
- *(pnext) = (a)->next; \
- PL_CLEAR_ARENA(a); \
- free(a); \
- (a) = 0; \
- PR_END_MACRO
-
-#ifdef PL_ARENAMETER
-
-#include <stdio.h>
-
-PR_EXTERN(void) PL_ArenaCountAllocation(PLArenaPool *pool, PRUint32 nb);
-
-PR_EXTERN(void) PL_ArenaCountInplaceGrowth(
- PLArenaPool *pool, PRUint32 size, PRUint32 incr);
-
-PR_EXTERN(void) PL_ArenaCountGrowth(
- PLArenaPool *pool, PRUint32 size, PRUint32 incr);
-
-PR_EXTERN(void) PL_ArenaCountRelease(PLArenaPool *pool, char *mark);
-
-PR_EXTERN(void) PL_ArenaCountRetract(PLArenaPool *pool, char *mark);
-
-PR_EXTERN(void) PL_DumpArenaStats(FILE *fp);
-
-#else /* !PL_ARENAMETER */
-
-#define PL_ArenaCountAllocation(ap, nb) /* nothing */
-#define PL_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
-#define PL_ArenaCountGrowth(ap, size, incr) /* nothing */
-#define PL_ArenaCountRelease(ap, mark) /* nothing */
-#define PL_ArenaCountRetract(ap, mark) /* nothing */
-
-#endif /* !PL_ARENAMETER */
-
-PR_END_EXTERN_C
-
-#endif /* plarena_h___ */
projects / apple / security.git / blobdiff