/js/lib/Socket.IO-node/support/expresso/deps/jscoverage/js/jsarena.h
C++ Header | 318 lines | 185 code | 47 blank | 86 comment | 18 complexity | 91c647bcc2878fbbba1fcfda277f2c8e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.1, MPL-2.0-no-copyleft-exception, BSD-3-Clause
- /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * 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 Mozilla Communicator client code, released
- * March 31, 1998.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef jsarena_h___
- #define jsarena_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 (JS_ARENA_MARK/JS_ARENA_RELEASE).
- */
- #include <stdlib.h>
- #include "jstypes.h"
- #include "jscompat.h"
- JS_BEGIN_EXTERN_C
- typedef struct JSArena JSArena;
- typedef struct JSArenaPool JSArenaPool;
- struct JSArena {
- JSArena *next; /* next arena for this lifetime */
- jsuword base; /* aligned base address, follows this header */
- jsuword limit; /* one beyond last byte in arena */
- jsuword avail; /* points to next available byte */
- };
- #ifdef JS_ARENAMETER
- typedef struct JSArenaStats JSArenaStats;
- struct JSArenaStats {
- JSArenaStats *next; /* next in arenaStats list */
- char *name; /* name for debugging */
- uint32 narenas; /* number of arenas in pool */
- uint32 nallocs; /* number of JS_ARENA_ALLOCATE() calls */
- uint32 nmallocs; /* number of malloc() calls */
- uint32 ndeallocs; /* number of lifetime deallocations */
- uint32 ngrows; /* number of JS_ARENA_GROW() calls */
- uint32 ninplace; /* number of in-place growths */
- uint32 nreallocs; /* number of arena grow extending reallocs */
- uint32 nreleases; /* number of JS_ARENA_RELEASE() calls */
- uint32 nfastrels; /* number of "fast path" releases */
- size_t nbytes; /* total bytes allocated */
- size_t maxalloc; /* maximum allocation size in bytes */
- double variance; /* size variance accumulator */
- };
- #endif
- struct JSArenaPool {
- JSArena first; /* first arena in pool list */
- JSArena *current; /* arena from which to allocate space */
- size_t arenasize; /* net exact size of a new arena */
- jsuword mask; /* alignment mask (power-of-2 - 1) */
- size_t *quotap; /* pointer to the quota on pool allocation
- size or null if pool is unlimited */
- #ifdef JS_ARENAMETER
- JSArenaStats stats;
- #endif
- };
- #ifdef JS_ARENAMETER
- #define JS_INIT_NAMED_ARENA_POOL(pool, name, size, align, quotap) \
- JS_InitArenaPool(pool, name, size, align, quotap)
- #else
- #define JS_INIT_NAMED_ARENA_POOL(pool, name, size, align, quotap) \
- JS_InitArenaPool(pool, size, align, quotap)
- #endif
- /*
- * If the including .c file uses only one power-of-2 alignment, it may define
- * JS_ARENA_CONST_ALIGN_MASK to the alignment mask and save a few instructions
- * per ALLOCATE and GROW.
- */
- #ifdef JS_ARENA_CONST_ALIGN_MASK
- #define JS_ARENA_ALIGN(pool, n) (((jsuword)(n) + JS_ARENA_CONST_ALIGN_MASK) \
- & ~(jsuword)JS_ARENA_CONST_ALIGN_MASK)
- #define JS_INIT_ARENA_POOL(pool, name, size, quotap) \
- JS_INIT_NAMED_ARENA_POOL(pool, name, size, JS_ARENA_CONST_ALIGN_MASK + 1, \
- quotap)
- #else
- #define JS_ARENA_ALIGN(pool, n) (((jsuword)(n) + (pool)->mask) & ~(pool)->mask)
- #define JS_INIT_ARENA_POOL(pool, name, size, align, quotap) \
- JS_INIT_NAMED_ARENA_POOL(pool, name, size, align, quotap)
- #endif
- #define JS_ARENA_ALLOCATE(p, pool, nb) \
- JS_ARENA_ALLOCATE_CAST(p, void *, pool, nb)
- #define JS_ARENA_ALLOCATE_TYPE(p, type, pool) \
- JS_ARENA_ALLOCATE_COMMON(p, type *, pool, sizeof(type), 0)
- #define JS_ARENA_ALLOCATE_CAST(p, type, pool, nb) \
- JS_ARENA_ALLOCATE_COMMON(p, type, pool, nb, _nb > _a->limit)
- /*
- * NB: In JS_ARENA_ALLOCATE_CAST and JS_ARENA_GROW_CAST, always subtract _nb
- * from a->limit rather than adding _nb to _p, to avoid overflowing a 32-bit
- * address space (possible when running a 32-bit program on a 64-bit system
- * where the kernel maps the heap up against the top of the 32-bit address
- * space).
- *
- * Thanks to Juergen Kreileder <jk@blackdown.de>, who brought this up in
- * https://bugzilla.mozilla.org/show_bug.cgi?id=279273.
- */
- #define JS_ARENA_ALLOCATE_COMMON(p, type, pool, nb, guard) \
- JS_BEGIN_MACRO \
- JSArena *_a = (pool)->current; \
- size_t _nb = JS_ARENA_ALIGN(pool, nb); \
- jsuword _p = _a->avail; \
- if ((guard) || _p > _a->limit - _nb) \
- _p = (jsuword)JS_ArenaAllocate(pool, _nb); \
- else \
- _a->avail = _p + _nb; \
- p = (type) _p; \
- JS_ArenaCountAllocation(pool, nb); \
- JS_END_MACRO
- #define JS_ARENA_GROW(p, pool, size, incr) \
- JS_ARENA_GROW_CAST(p, void *, pool, size, incr)
- #define JS_ARENA_GROW_CAST(p, type, pool, size, incr) \
- JS_BEGIN_MACRO \
- JSArena *_a = (pool)->current; \
- if (_a->avail == (jsuword)(p) + JS_ARENA_ALIGN(pool, size)) { \
- size_t _nb = (size) + (incr); \
- _nb = JS_ARENA_ALIGN(pool, _nb); \
- if (_a->limit >= _nb && (jsuword)(p) <= _a->limit - _nb) { \
- _a->avail = (jsuword)(p) + _nb; \
- JS_ArenaCountInplaceGrowth(pool, size, incr); \
- } else if ((jsuword)(p) == _a->base) { \
- p = (type) JS_ArenaRealloc(pool, p, size, incr); \
- } else { \
- p = (type) JS_ArenaGrow(pool, p, size, incr); \
- } \
- } else { \
- p = (type) JS_ArenaGrow(pool, p, size, incr); \
- } \
- JS_ArenaCountGrowth(pool, size, incr); \
- JS_END_MACRO
- #define JS_ARENA_MARK(pool) ((void *) (pool)->current->avail)
- #define JS_UPTRDIFF(p,q) ((jsuword)(p) - (jsuword)(q))
- /*
- * Check if the mark is inside arena's allocated area.
- */
- #define JS_ARENA_MARK_MATCH(a, mark) \
- (JS_UPTRDIFF(mark, (a)->base) <= JS_UPTRDIFF((a)->avail, (a)->base))
- #ifdef DEBUG
- #define JS_FREE_PATTERN 0xDA
- #define JS_CLEAR_UNUSED(a) (JS_ASSERT((a)->avail <= (a)->limit), \
- memset((void*)(a)->avail, JS_FREE_PATTERN, \
- (a)->limit - (a)->avail))
- #define JS_CLEAR_ARENA(a) memset((void*)(a), JS_FREE_PATTERN, \
- (a)->limit - (jsuword)(a))
- #else
- #define JS_CLEAR_UNUSED(a) /* nothing */
- #define JS_CLEAR_ARENA(a) /* nothing */
- #endif
- #define JS_ARENA_RELEASE(pool, mark) \
- JS_BEGIN_MACRO \
- char *_m = (char *)(mark); \
- JSArena *_a = (pool)->current; \
- if (_a != &(pool)->first && JS_ARENA_MARK_MATCH(_a, _m)) { \
- _a->avail = (jsuword)JS_ARENA_ALIGN(pool, _m); \
- JS_ASSERT(_a->avail <= _a->limit); \
- JS_CLEAR_UNUSED(_a); \
- JS_ArenaCountRetract(pool, _m); \
- } else { \
- JS_ArenaRelease(pool, _m); \
- } \
- JS_ArenaCountRelease(pool, _m); \
- JS_END_MACRO
- #ifdef JS_ARENAMETER
- #define JS_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
- #else
- #define JS_COUNT_ARENA(pool,op)
- #endif
- #define JS_ARENA_DESTROY(pool, a, pnext) \
- JS_BEGIN_MACRO \
- JS_COUNT_ARENA(pool,--); \
- if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
- *(pnext) = (a)->next; \
- JS_CLEAR_ARENA(a); \
- free(a); \
- (a) = NULL; \
- JS_END_MACRO
- /*
- * Initialize an arena pool with a minimum size per arena of size bytes.
- * Always call JS_SET_ARENA_METER_NAME before calling this or use
- * JS_INIT_ARENA_POOL macro to provide a name for for debugging and metering.
- */
- extern JS_PUBLIC_API(void)
- JS_INIT_NAMED_ARENA_POOL(JSArenaPool *pool, const char *name, size_t size,
- size_t align, size_t *quotap);
- /*
- * Free the arenas in pool. The user may continue to allocate from pool
- * after calling this function. There is no need to call JS_InitArenaPool()
- * again unless JS_FinishArenaPool(pool) has been called.
- */
- extern JS_PUBLIC_API(void)
- JS_FreeArenaPool(JSArenaPool *pool);
- /*
- * Free the arenas in pool and finish using it altogether.
- */
- extern JS_PUBLIC_API(void)
- JS_FinishArenaPool(JSArenaPool *pool);
- /*
- * Deprecated do-nothing function.
- */
- extern JS_PUBLIC_API(void)
- JS_ArenaFinish(void);
- /*
- * Deprecated do-nothing function.
- */
- extern JS_PUBLIC_API(void)
- JS_ArenaShutDown(void);
- /*
- * Friend functions used by the JS_ARENA_*() macros.
- */
- extern JS_PUBLIC_API(void *)
- JS_ArenaAllocate(JSArenaPool *pool, size_t nb);
- extern JS_PUBLIC_API(void *)
- JS_ArenaRealloc(JSArenaPool *pool, void *p, size_t size, size_t incr);
- extern JS_PUBLIC_API(void *)
- JS_ArenaGrow(JSArenaPool *pool, void *p, size_t size, size_t incr);
- extern JS_PUBLIC_API(void)
- JS_ArenaRelease(JSArenaPool *pool, char *mark);
- #ifdef JS_ARENAMETER
- #include <stdio.h>
- extern JS_PUBLIC_API(void)
- JS_ArenaCountAllocation(JSArenaPool *pool, size_t nb);
- extern JS_PUBLIC_API(void)
- JS_ArenaCountInplaceGrowth(JSArenaPool *pool, size_t size, size_t incr);
- extern JS_PUBLIC_API(void)
- JS_ArenaCountGrowth(JSArenaPool *pool, size_t size, size_t incr);
- extern JS_PUBLIC_API(void)
- JS_ArenaCountRelease(JSArenaPool *pool, char *mark);
- extern JS_PUBLIC_API(void)
- JS_ArenaCountRetract(JSArenaPool *pool, char *mark);
- extern JS_PUBLIC_API(void)
- JS_DumpArenaStats(FILE *fp);
- #else /* !JS_ARENAMETER */
- #define JS_ArenaCountAllocation(ap, nb) /* nothing */
- #define JS_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
- #define JS_ArenaCountGrowth(ap, size, incr) /* nothing */
- #define JS_ArenaCountRelease(ap, mark) /* nothing */
- #define JS_ArenaCountRetract(ap, mark) /* nothing */
- #endif /* !JS_ARENAMETER */
- JS_END_EXTERN_C
- #endif /* jsarena_h___ */