mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-12 00:50:40 +00:00
254 lines
8.7 KiB
C
254 lines
8.7 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#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 */
|
|
PRUint32 arenasize; /* net exact size of a new arena */
|
|
PRUword mask; /* alignment mask (power-of-2 - 1) */
|
|
#ifdef PL_ARENAMETER
|
|
PLArenaStats stats;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* WARNING: The PL_MAKE_MEM_ macros are for internal use by NSPR. Do NOT use
|
|
* them in your code.
|
|
*
|
|
* NOTE: Valgrind support to be added.
|
|
*
|
|
* The PL_MAKE_MEM_ macros are modeled after the MOZ_MAKE_MEM_ macros in
|
|
* Mozilla's mfbt/MemoryChecking.h. Only AddressSanitizer is supported now.
|
|
*
|
|
* Provides a common interface to the ASan (AddressSanitizer) and Valgrind
|
|
* functions used to mark memory in certain ways. In detail, the following
|
|
* three macros are provided:
|
|
*
|
|
* PL_MAKE_MEM_NOACCESS - Mark memory as unsafe to access (e.g. freed)
|
|
* PL_MAKE_MEM_UNDEFINED - Mark memory as accessible, with content undefined
|
|
* PL_MAKE_MEM_DEFINED - Mark memory as accessible, with content defined
|
|
*
|
|
* With Valgrind in use, these directly map to the three respective Valgrind
|
|
* macros. With ASan in use, the NOACCESS macro maps to poisoning the memory,
|
|
* while the UNDEFINED/DEFINED macros unpoison memory.
|
|
*
|
|
* With no memory checker available, all macros expand to the empty statement.
|
|
*/
|
|
|
|
/* WARNING: PL_SANITIZE_ADDRESS is for internal use by this header. Do NOT
|
|
* define or test this macro in your code.
|
|
*/
|
|
#if defined(__has_feature)
|
|
#if __has_feature(address_sanitizer)
|
|
#define PL_SANITIZE_ADDRESS 1
|
|
#endif
|
|
#elif defined(__SANITIZE_ADDRESS__)
|
|
#define PL_SANITIZE_ADDRESS 1
|
|
#endif
|
|
|
|
#if defined(PL_SANITIZE_ADDRESS)
|
|
|
|
/* These definitions are usually provided through the
|
|
* sanitizer/asan_interface.h header installed by ASan.
|
|
* See https://code.google.com/p/address-sanitizer/wiki/ManualPoisoning
|
|
*/
|
|
|
|
void __asan_poison_memory_region(void const volatile *addr, size_t size);
|
|
void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
|
|
|
|
#define PL_MAKE_MEM_NOACCESS(addr, size) \
|
|
__asan_poison_memory_region((addr), (size))
|
|
|
|
#define PL_MAKE_MEM_UNDEFINED(addr, size) \
|
|
__asan_unpoison_memory_region((addr), (size))
|
|
|
|
#define PL_MAKE_MEM_DEFINED(addr, size) \
|
|
__asan_unpoison_memory_region((addr), (size))
|
|
|
|
#else
|
|
|
|
#define PL_MAKE_MEM_NOACCESS(addr, size)
|
|
#define PL_MAKE_MEM_UNDEFINED(addr, size)
|
|
#define PL_MAKE_MEM_DEFINED(addr, size)
|
|
|
|
#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) (((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_MAKE_MEM_UNDEFINED(p, nb); \
|
|
PL_ArenaCountAllocation(pool, nb); \
|
|
PR_END_MACRO
|
|
|
|
#define PL_ARENA_GROW(p, pool, size, incr) \
|
|
PR_BEGIN_MACRO \
|
|
PLArena *_a = (pool)->current; \
|
|
PRUint32 _incr = PL_ARENA_ALIGN(pool, incr); \
|
|
PRUword _p = _a->avail; \
|
|
PRUword _q = _p + _incr; \
|
|
if (_p == (PRUword)(p) + PL_ARENA_ALIGN(pool, size) && \
|
|
_q <= _a->limit) { \
|
|
PL_MAKE_MEM_UNDEFINED((unsigned char *)(p) + size, incr); \
|
|
_a->avail = _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))
|
|
|
|
#define PL_CLEAR_UNUSED_PATTERN(a, pattern) \
|
|
PR_BEGIN_MACRO \
|
|
PR_ASSERT((a)->avail <= (a)->limit); \
|
|
PL_MAKE_MEM_UNDEFINED((void*)(a)->avail, (a)->limit - (a)->avail); \
|
|
memset((void*)(a)->avail, (pattern), (a)->limit - (a)->avail); \
|
|
PR_END_MACRO
|
|
#ifdef DEBUG
|
|
#define PL_FREE_PATTERN 0xDA
|
|
#define PL_CLEAR_UNUSED(a) PL_CLEAR_UNUSED_PATTERN((a), PL_FREE_PATTERN)
|
|
#define PL_CLEAR_ARENA(a) \
|
|
PR_BEGIN_MACRO \
|
|
PL_MAKE_MEM_UNDEFINED((void*)(a), (a)->limit - (PRUword)(a)); \
|
|
memset((void*)(a), PL_FREE_PATTERN, (a)->limit - (PRUword)(a)); \
|
|
PR_END_MACRO
|
|
#else
|
|
#define PL_CLEAR_UNUSED(a)
|
|
#define PL_CLEAR_ARENA(a)
|
|
#endif
|
|
|
|
#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_MAKE_MEM_NOACCESS((void*)_a->avail, _a->limit - _a->avail); \
|
|
PL_ArenaCountRetract(pool, _m); \
|
|
} else { \
|
|
PL_ArenaRelease(pool, _m); \
|
|
} \
|
|
PL_ArenaCountRelease(pool, _m); \
|
|
PR_END_MACRO
|
|
|
|
#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___ */
|