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+/* -*- 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___ */
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