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Diffstat (limited to 'memory/mozjemalloc/jemalloc.c')
| -rw-r--r-- | memory/mozjemalloc/jemalloc.c | 7188 |
1 files changed, 7188 insertions, 0 deletions
diff --git a/memory/mozjemalloc/jemalloc.c b/memory/mozjemalloc/jemalloc.c new file mode 100644 index 0000000000..5d4d83a24e --- /dev/null +++ b/memory/mozjemalloc/jemalloc.c @@ -0,0 +1,7188 @@ +/* -*- Mode: C; tab-width: 8; c-basic-offset: 8; indent-tabs-mode: t -*- */ +/* vim:set softtabstop=8 shiftwidth=8 noet: */ +/*- + * Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice(s), this list of conditions and the following disclaimer as + * the first lines of this file unmodified other than the possible + * addition of one or more copyright notices. + * 2. Redistributions in binary form must reproduce the above copyright + * notice(s), this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + ******************************************************************************* + * + * This allocator implementation is designed to provide scalable performance + * for multi-threaded programs on multi-processor systems. The following + * features are included for this purpose: + * + * + Multiple arenas are used if there are multiple CPUs, which reduces lock + * contention and cache sloshing. + * + * + Cache line sharing between arenas is avoided for internal data + * structures. + * + * + Memory is managed in chunks and runs (chunks can be split into runs), + * rather than as individual pages. This provides a constant-time + * mechanism for associating allocations with particular arenas. + * + * Allocation requests are rounded up to the nearest size class, and no record + * of the original request size is maintained. Allocations are broken into + * categories according to size class. Assuming runtime defaults, 4 kB pages + * and a 16 byte quantum on a 32-bit system, the size classes in each category + * are as follows: + * + * |=====================================| + * | Category | Subcategory | Size | + * |=====================================| + * | Small | Tiny | 2 | + * | | | 4 | + * | | | 8 | + * | |----------------+---------| + * | | Quantum-spaced | 16 | + * | | | 32 | + * | | | 48 | + * | | | ... | + * | | | 480 | + * | | | 496 | + * | | | 512 | + * | |----------------+---------| + * | | Sub-page | 1 kB | + * | | | 2 kB | + * |=====================================| + * | Large | 4 kB | + * | | 8 kB | + * | | 12 kB | + * | | ... | + * | | 1012 kB | + * | | 1016 kB | + * | | 1020 kB | + * |=====================================| + * | Huge | 1 MB | + * | | 2 MB | + * | | 3 MB | + * | | ... | + * |=====================================| + * + * NOTE: Due to Mozilla bug 691003, we cannot reserve less than one word for an + * allocation on Linux or Mac. So on 32-bit *nix, the smallest bucket size is + * 4 bytes, and on 64-bit, the smallest bucket size is 8 bytes. + * + * A different mechanism is used for each category: + * + * Small : Each size class is segregated into its own set of runs. Each run + * maintains a bitmap of which regions are free/allocated. + * + * Large : Each allocation is backed by a dedicated run. Metadata are stored + * in the associated arena chunk header maps. + * + * Huge : Each allocation is backed by a dedicated contiguous set of chunks. + * Metadata are stored in a separate red-black tree. + * + ******************************************************************************* + */ + +#ifdef MOZ_MEMORY_ANDROID +#define NO_TLS +#define _pthread_self() pthread_self() +#endif + +/* + * On Linux, we use madvise(MADV_DONTNEED) to release memory back to the + * operating system. If we release 1MB of live pages with MADV_DONTNEED, our + * RSS will decrease by 1MB (almost) immediately. + * + * On Mac, we use madvise(MADV_FREE). Unlike MADV_DONTNEED on Linux, MADV_FREE + * on Mac doesn't cause the OS to release the specified pages immediately; the + * OS keeps them in our process until the machine comes under memory pressure. + * + * It's therefore difficult to measure the process's RSS on Mac, since, in the + * absence of memory pressure, the contribution from the heap to RSS will not + * decrease due to our madvise calls. + * + * We therefore define MALLOC_DOUBLE_PURGE on Mac. This causes jemalloc to + * track which pages have been MADV_FREE'd. You can then call + * jemalloc_purge_freed_pages(), which will force the OS to release those + * MADV_FREE'd pages, making the process's RSS reflect its true memory usage. + * + * The jemalloc_purge_freed_pages definition in memory/build/mozmemory.h needs + * to be adjusted if MALLOC_DOUBLE_PURGE is ever enabled on Linux. + */ +#ifdef MOZ_MEMORY_DARWIN +#define MALLOC_DOUBLE_PURGE +#endif + +/* + * MALLOC_PRODUCTION disables assertions and statistics gathering. It also + * defaults the A and J runtime options to off. These settings are appropriate + * for production systems. + */ +#ifndef MOZ_MEMORY_DEBUG +# define MALLOC_PRODUCTION +#endif + +/* + * Use only one arena by default. Mozilla does not currently make extensive + * use of concurrent allocation, so the increased fragmentation associated with + * multiple arenas is not warranted. + * + * When using the Servo style system, we do indeed make use of significant + * concurrent allocation, and the overhead matters. Bug 1291355 tracks + * investigating the fragmentation overhead of turning this on for users. + */ +#ifndef MOZ_STYLO +#define MOZ_MEMORY_NARENAS_DEFAULT_ONE +#endif + +/* + * Pass this set of options to jemalloc as its default. It does not override + * the options passed via the MALLOC_OPTIONS environment variable but is + * applied in addition to them. + */ +#ifdef MOZ_WIDGET_GONK + /* Reduce the amount of unused dirty pages to 1MiB on B2G */ +# define MOZ_MALLOC_OPTIONS "ff" +#else +# define MOZ_MALLOC_OPTIONS "" +#endif + +/* + * MALLOC_STATS enables statistics calculation, and is required for + * jemalloc_stats(). + */ +#define MALLOC_STATS + +/* Memory filling (junk/poison/zero). */ +#define MALLOC_FILL + +#ifndef MALLOC_PRODUCTION + /* + * MALLOC_DEBUG enables assertions and other sanity checks, and disables + * inline functions. + */ +# define MALLOC_DEBUG + + /* Allocation tracing. */ +# ifndef MOZ_MEMORY_WINDOWS +# define MALLOC_UTRACE +# endif + + /* Support optional abort() on OOM. */ +# define MALLOC_XMALLOC + + /* Support SYSV semantics. */ +# define MALLOC_SYSV +#endif + +/* + * MALLOC_VALIDATE causes malloc_usable_size() to perform some pointer + * validation. There are many possible errors that validation does not even + * attempt to detect. + */ +#define MALLOC_VALIDATE + +/* + * MALLOC_BALANCE enables monitoring of arena lock contention and dynamically + * re-balances arena load if exponentially averaged contention exceeds a + * certain threshold. + */ +/* #define MALLOC_BALANCE */ + +#if defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID) +#define _GNU_SOURCE /* For mremap(2). */ +#if 0 /* Enable in order to test decommit code on Linux. */ +# define MALLOC_DECOMMIT +#endif +#endif + +#include <sys/types.h> + +#include <errno.h> +#include <stdlib.h> +#include <limits.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> + +#ifdef MOZ_MEMORY_WINDOWS + +/* Some defines from the CRT internal headers that we need here. */ +#define _CRT_SPINCOUNT 5000 +#define __crtInitCritSecAndSpinCount InitializeCriticalSectionAndSpinCount +#include <io.h> +#include <windows.h> +#include <intrin.h> + +#pragma warning( disable: 4267 4996 4146 ) + +#define bool BOOL +#define false FALSE +#define true TRUE +#define inline __inline +#define SIZE_T_MAX SIZE_MAX +#define STDERR_FILENO 2 +#define PATH_MAX MAX_PATH +#define vsnprintf _vsnprintf + +#ifndef NO_TLS +static unsigned long tlsIndex = 0xffffffff; +#endif + +#define __thread +#define _pthread_self() __threadid() + +/* use MSVC intrinsics */ +#pragma intrinsic(_BitScanForward) +static __forceinline int +ffs(int x) +{ + unsigned long i; + + if (_BitScanForward(&i, x) != 0) + return (i + 1); + + return (0); +} + +/* Implement getenv without using malloc */ +static char mozillaMallocOptionsBuf[64]; + +#define getenv xgetenv +static char * +getenv(const char *name) +{ + + if (GetEnvironmentVariableA(name, (LPSTR)&mozillaMallocOptionsBuf, + sizeof(mozillaMallocOptionsBuf)) > 0) + return (mozillaMallocOptionsBuf); + + return (NULL); +} + +typedef unsigned char uint8_t; +typedef unsigned uint32_t; +typedef unsigned long long uint64_t; +typedef unsigned long long uintmax_t; +#if defined(_WIN64) +typedef long long ssize_t; +#else +typedef long ssize_t; +#endif + +#define MALLOC_DECOMMIT +#endif + +/* + * Allow unmapping pages on all platforms. Note that if this is disabled, + * jemalloc will never unmap anything, instead recycling pages for later use. + */ +#define JEMALLOC_MUNMAP + +/* + * Enable limited chunk recycling on all platforms. Note that when + * JEMALLOC_MUNMAP is not defined, all chunks will be recycled unconditionally. + */ +#define JEMALLOC_RECYCLE + +#ifndef MOZ_MEMORY_WINDOWS +#ifndef MOZ_MEMORY_SOLARIS +#include <sys/cdefs.h> +#endif +#ifndef __DECONST +# define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var)) +#endif +#ifndef MOZ_MEMORY +__FBSDID("$FreeBSD: head/lib/libc/stdlib/malloc.c 180599 2008-07-18 19:35:44Z jasone $"); +#include "libc_private.h" +#ifdef MALLOC_DEBUG +# define _LOCK_DEBUG +#endif +#include "spinlock.h" +#include "namespace.h" +#endif +#include <sys/mman.h> +#ifndef MADV_FREE +# define MADV_FREE MADV_DONTNEED +#endif +#ifndef MAP_NOSYNC +# define MAP_NOSYNC 0 +#endif +#include <sys/param.h> +#ifndef MOZ_MEMORY +#include <sys/stddef.h> +#endif +#include <sys/time.h> +#include <sys/types.h> +#if !defined(MOZ_MEMORY_SOLARIS) && !defined(MOZ_MEMORY_ANDROID) +#include <sys/sysctl.h> +#endif +#include <sys/uio.h> +#ifndef MOZ_MEMORY +#include <sys/ktrace.h> /* Must come after several other sys/ includes. */ + +#include <machine/atomic.h> +#include <machine/cpufunc.h> +#include <machine/vmparam.h> +#endif + +#include <errno.h> +#include <limits.h> +#ifndef SIZE_T_MAX +# define SIZE_T_MAX SIZE_MAX +#endif +#include <pthread.h> +#ifdef MOZ_MEMORY_DARWIN +#define _pthread_self pthread_self +#define _pthread_mutex_init pthread_mutex_init +#define _pthread_mutex_trylock pthread_mutex_trylock +#define _pthread_mutex_lock pthread_mutex_lock +#define _pthread_mutex_unlock pthread_mutex_unlock +#endif +#include <sched.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#ifndef MOZ_MEMORY_DARWIN +#include <strings.h> +#endif +#include <unistd.h> + +#ifdef MOZ_MEMORY_DARWIN +#include <libkern/OSAtomic.h> +#include <mach/mach_error.h> +#include <mach/mach_init.h> +#include <mach/vm_map.h> +#include <malloc/malloc.h> +#endif + +#ifndef MOZ_MEMORY +#include "un-namespace.h" +#endif + +#endif + +#include "jemalloc_types.h" +#include "linkedlist.h" +#include "mozmemory_wrap.h" + +/* Some tools, such as /dev/dsp wrappers, LD_PRELOAD libraries that + * happen to override mmap() and call dlsym() from their overridden + * mmap(). The problem is that dlsym() calls malloc(), and this ends + * up in a dead lock in jemalloc. + * On these systems, we prefer to directly use the system call. + * We do that for Linux systems and kfreebsd with GNU userland. + * Note sanity checks are not done (alignment of offset, ...) because + * the uses of mmap are pretty limited, in jemalloc. + * + * On Alpha, glibc has a bug that prevents syscall() to work for system + * calls with 6 arguments + */ +#if (defined(MOZ_MEMORY_LINUX) && !defined(__alpha__)) || \ + (defined(MOZ_MEMORY_BSD) && defined(__GLIBC__)) +#include <sys/syscall.h> +#if defined(SYS_mmap) || defined(SYS_mmap2) +static inline +void *_mmap(void *addr, size_t length, int prot, int flags, + int fd, off_t offset) +{ +/* S390 only passes one argument to the mmap system call, which is a + * pointer to a structure containing the arguments */ +#ifdef __s390__ + struct { + void *addr; + size_t length; + long prot; + long flags; + long fd; + off_t offset; + } args = { addr, length, prot, flags, fd, offset }; + return (void *) syscall(SYS_mmap, &args); +#else +#ifdef SYS_mmap2 + return (void *) syscall(SYS_mmap2, addr, length, prot, flags, + fd, offset >> 12); +#else + return (void *) syscall(SYS_mmap, addr, length, prot, flags, + fd, offset); +#endif +#endif +} +#define mmap _mmap +#define munmap(a, l) syscall(SYS_munmap, a, l) +#endif +#endif + +#ifdef MOZ_MEMORY_DARWIN +static const bool isthreaded = true; +#endif + +#if defined(MOZ_MEMORY_SOLARIS) && defined(MAP_ALIGN) && !defined(JEMALLOC_NEVER_USES_MAP_ALIGN) +#define JEMALLOC_USES_MAP_ALIGN /* Required on Solaris 10. Might improve performance elsewhere. */ +#endif + +#ifndef __DECONST +#define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var)) +#endif + +#ifdef MOZ_MEMORY_WINDOWS + /* MSVC++ does not support C99 variable-length arrays. */ +# define RB_NO_C99_VARARRAYS +#endif +#include "rb.h" + +#ifdef MALLOC_DEBUG + /* Disable inlining to make debugging easier. */ +#ifdef inline +#undef inline +#endif + +# define inline +#endif + +/* Size of stack-allocated buffer passed to strerror_r(). */ +#define STRERROR_BUF 64 + +/* Minimum alignment of non-tiny allocations is 2^QUANTUM_2POW_MIN bytes. */ +# define QUANTUM_2POW_MIN 4 +#if defined(_WIN64) || defined(__LP64__) +# define SIZEOF_PTR_2POW 3 +#else +# define SIZEOF_PTR_2POW 2 +#endif +#define PIC +#ifndef MOZ_MEMORY_DARWIN +static const bool isthreaded = true; +#else +# define NO_TLS +#endif +#if 0 +#ifdef __i386__ +# define QUANTUM_2POW_MIN 4 +# define SIZEOF_PTR_2POW 2 +# define CPU_SPINWAIT __asm__ volatile("pause") +#endif +#ifdef __ia64__ +# define QUANTUM_2POW_MIN 4 +# define SIZEOF_PTR_2POW 3 +#endif +#ifdef __alpha__ +# define QUANTUM_2POW_MIN 4 +# define SIZEOF_PTR_2POW 3 +# define NO_TLS +#endif +#ifdef __sparc64__ +# define QUANTUM_2POW_MIN 4 +# define SIZEOF_PTR_2POW 3 +# define NO_TLS +#endif +#ifdef __amd64__ +# define QUANTUM_2POW_MIN 4 +# define SIZEOF_PTR_2POW 3 +# define CPU_SPINWAIT __asm__ volatile("pause") +#endif +#ifdef __arm__ +# define QUANTUM_2POW_MIN 3 +# define SIZEOF_PTR_2POW 2 +# define NO_TLS +#endif +#ifdef __mips__ +# define QUANTUM_2POW_MIN 3 +# define SIZEOF_PTR_2POW 2 +# define NO_TLS +#endif +#ifdef __powerpc__ +# define QUANTUM_2POW_MIN 4 +# define SIZEOF_PTR_2POW 2 +#endif +#endif + +#define SIZEOF_PTR (1U << SIZEOF_PTR_2POW) + +/* sizeof(int) == (1U << SIZEOF_INT_2POW). */ +#ifndef SIZEOF_INT_2POW +# define SIZEOF_INT_2POW 2 +#endif + +/* We can't use TLS in non-PIC programs, since TLS relies on loader magic. */ +#if (!defined(PIC) && !defined(NO_TLS)) +# define NO_TLS +#endif + +#ifdef NO_TLS + /* MALLOC_BALANCE requires TLS. */ +# ifdef MALLOC_BALANCE +# undef MALLOC_BALANCE +# endif +#endif + +/* + * Size and alignment of memory chunks that are allocated by the OS's virtual + * memory system. + */ +#define CHUNK_2POW_DEFAULT 20 +/* Maximum number of dirty pages per arena. */ +#define DIRTY_MAX_DEFAULT (1U << 8) + +/* + * Maximum size of L1 cache line. This is used to avoid cache line aliasing, + * so over-estimates are okay (up to a point), but under-estimates will + * negatively affect performance. + */ +#define CACHELINE_2POW 6 +#define CACHELINE ((size_t)(1U << CACHELINE_2POW)) + +/* + * Smallest size class to support. On Windows the smallest allocation size + * must be 8 bytes on 32-bit, 16 bytes on 64-bit. On Linux and Mac, even + * malloc(1) must reserve a word's worth of memory (see Mozilla bug 691003). + */ +#ifdef MOZ_MEMORY_WINDOWS +#define TINY_MIN_2POW (sizeof(void*) == 8 ? 4 : 3) +#else +#define TINY_MIN_2POW (sizeof(void*) == 8 ? 3 : 2) +#endif + +/* + * Maximum size class that is a multiple of the quantum, but not (necessarily) + * a power of 2. Above this size, allocations are rounded up to the nearest + * power of 2. + */ +#define SMALL_MAX_2POW_DEFAULT 9 +#define SMALL_MAX_DEFAULT (1U << SMALL_MAX_2POW_DEFAULT) + +/* + * RUN_MAX_OVRHD indicates maximum desired run header overhead. Runs are sized + * as small as possible such that this setting is still honored, without + * violating other constraints. The goal is to make runs as small as possible + * without exceeding a per run external fragmentation threshold. + * + * We use binary fixed point math for overhead computations, where the binary + * point is implicitly RUN_BFP bits to the left. + * + * Note that it is possible to set RUN_MAX_OVRHD low enough that it cannot be + * honored for some/all object sizes, since there is one bit of header overhead + * per object (plus a constant). This constraint is relaxed (ignored) for runs + * that are so small that the per-region overhead is greater than: + * + * (RUN_MAX_OVRHD / (reg_size << (3+RUN_BFP)) + */ +#define RUN_BFP 12 +/* \/ Implicit binary fixed point. */ +#define RUN_MAX_OVRHD 0x0000003dU +#define RUN_MAX_OVRHD_RELAX 0x00001800U + +/* + * Hyper-threaded CPUs may need a special instruction inside spin loops in + * order to yield to another virtual CPU. If no such instruction is defined + * above, make CPU_SPINWAIT a no-op. + */ +#ifndef CPU_SPINWAIT +# define CPU_SPINWAIT +#endif + +/* + * Adaptive spinning must eventually switch to blocking, in order to avoid the + * potential for priority inversion deadlock. Backing off past a certain point + * can actually waste time. + */ +#define SPIN_LIMIT_2POW 11 + +/* + * Conversion from spinning to blocking is expensive; we use (1U << + * BLOCK_COST_2POW) to estimate how many more times costly blocking is than + * worst-case spinning. + */ +#define BLOCK_COST_2POW 4 + +#ifdef MALLOC_BALANCE + /* + * We use an exponential moving average to track recent lock contention, + * where the size of the history window is N, and alpha=2/(N+1). + * + * Due to integer math rounding, very small values here can cause + * substantial degradation in accuracy, thus making the moving average decay + * faster than it would with precise calculation. + */ +# define BALANCE_ALPHA_INV_2POW 9 + + /* + * Threshold value for the exponential moving contention average at which to + * re-assign a thread. + */ +# define BALANCE_THRESHOLD_DEFAULT (1U << (SPIN_LIMIT_2POW-4)) +#endif + +/******************************************************************************/ + +/* MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive. */ +#if defined(MALLOC_DECOMMIT) && defined(MALLOC_DOUBLE_PURGE) +#error MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive. +#endif + +/* + * Mutexes based on spinlocks. We can't use normal pthread spinlocks in all + * places, because they require malloc()ed memory, which causes bootstrapping + * issues in some cases. + */ +#if defined(MOZ_MEMORY_WINDOWS) +#define malloc_mutex_t CRITICAL_SECTION +#define malloc_spinlock_t CRITICAL_SECTION +#elif defined(MOZ_MEMORY_DARWIN) +typedef struct { + OSSpinLock lock; +} malloc_mutex_t; +typedef struct { + OSSpinLock lock; +} malloc_spinlock_t; +#elif defined(MOZ_MEMORY) +typedef pthread_mutex_t malloc_mutex_t; +typedef pthread_mutex_t malloc_spinlock_t; +#else +/* XXX these should #ifdef these for freebsd (and linux?) only */ +typedef struct { + spinlock_t lock; +} malloc_mutex_t; +typedef malloc_spinlock_t malloc_mutex_t; +#endif + +/* Set to true once the allocator has been initialized. */ +static bool malloc_initialized = false; + +#if defined(MOZ_MEMORY_WINDOWS) +/* No init lock for Windows. */ +#elif defined(MOZ_MEMORY_DARWIN) +static malloc_mutex_t init_lock = {OS_SPINLOCK_INIT}; +#elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID) +static malloc_mutex_t init_lock = PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP; +#elif defined(MOZ_MEMORY) +static malloc_mutex_t init_lock = PTHREAD_MUTEX_INITIALIZER; +#else +static malloc_mutex_t init_lock = {_SPINLOCK_INITIALIZER}; +#endif + +/******************************************************************************/ +/* + * Statistics data structures. + */ + +#ifdef MALLOC_STATS + +typedef struct malloc_bin_stats_s malloc_bin_stats_t; +struct malloc_bin_stats_s { + /* + * Number of allocation requests that corresponded to the size of this + * bin. + */ + uint64_t nrequests; + + /* Total number of runs created for this bin's size class. */ + uint64_t nruns; + + /* + * Total number of runs reused by extracting them from the runs tree for + * this bin's size class. + */ + uint64_t reruns; + + /* High-water mark for this bin. */ + unsigned long highruns; + + /* Current number of runs in this bin. */ + unsigned long curruns; +}; + +typedef struct arena_stats_s arena_stats_t; +struct arena_stats_s { + /* Number of bytes currently mapped. */ + size_t mapped; + + /* + * Total number of purge sweeps, total number of madvise calls made, + * and total pages purged in order to keep dirty unused memory under + * control. + */ + uint64_t npurge; + uint64_t nmadvise; + uint64_t purged; +#ifdef MALLOC_DECOMMIT + /* + * Total number of decommit/commit operations, and total number of + * pages decommitted. + */ + uint64_t ndecommit; + uint64_t ncommit; + uint64_t decommitted; +#endif + + /* Current number of committed pages. */ + size_t committed; + + /* Per-size-category statistics. */ + size_t allocated_small; + uint64_t nmalloc_small; + uint64_t ndalloc_small; + + size_t allocated_large; + uint64_t nmalloc_large; + uint64_t ndalloc_large; + +#ifdef MALLOC_BALANCE + /* Number of times this arena reassigned a thread due to contention. */ + uint64_t nbalance; +#endif +}; + +#endif /* #ifdef MALLOC_STATS */ + +/******************************************************************************/ +/* + * Extent data structures. + */ + +/* Tree of extents. */ +typedef struct extent_node_s extent_node_t; +struct extent_node_s { + /* Linkage for the size/address-ordered tree. */ + rb_node(extent_node_t) link_szad; + + /* Linkage for the address-ordered tree. */ + rb_node(extent_node_t) link_ad; + + /* Pointer to the extent that this tree node is responsible for. */ + void *addr; + + /* Total region size. */ + size_t size; + + /* True if zero-filled; used by chunk recycling code. */ + bool zeroed; +}; +typedef rb_tree(extent_node_t) extent_tree_t; + +/******************************************************************************/ +/* + * Radix tree data structures. + */ + +#ifdef MALLOC_VALIDATE + /* + * Size of each radix tree node (must be a power of 2). This impacts tree + * depth. + */ +# if (SIZEOF_PTR == 4) +# define MALLOC_RTREE_NODESIZE (1U << 14) +# else +# define MALLOC_RTREE_NODESIZE CACHELINE +# endif + +typedef struct malloc_rtree_s malloc_rtree_t; +struct malloc_rtree_s { + malloc_spinlock_t lock; + void **root; + unsigned height; + unsigned level2bits[1]; /* Dynamically sized. */ +}; +#endif + +/******************************************************************************/ +/* + * Arena data structures. + */ + +typedef struct arena_s arena_t; +typedef struct arena_bin_s arena_bin_t; + +/* Each element of the chunk map corresponds to one page within the chunk. */ +typedef struct arena_chunk_map_s arena_chunk_map_t; +struct arena_chunk_map_s { + /* + * Linkage for run trees. There are two disjoint uses: + * + * 1) arena_t's runs_avail tree. + * 2) arena_run_t conceptually uses this linkage for in-use non-full + * runs, rather than directly embedding linkage. + */ + rb_node(arena_chunk_map_t) link; + + /* + * Run address (or size) and various flags are stored together. The bit + * layout looks like (assuming 32-bit system): + * + * ???????? ???????? ????---- -mckdzla + * + * ? : Unallocated: Run address for first/last pages, unset for internal + * pages. + * Small: Run address. + * Large: Run size for first page, unset for trailing pages. + * - : Unused. + * m : MADV_FREE/MADV_DONTNEED'ed? + * c : decommitted? + * k : key? + * d : dirty? + * z : zeroed? + * l : large? + * a : allocated? + * + * Following are example bit patterns for the three types of runs. + * + * r : run address + * s : run size + * x : don't care + * - : 0 + * [cdzla] : bit set + * + * Unallocated: + * ssssssss ssssssss ssss---- --c----- + * xxxxxxxx xxxxxxxx xxxx---- ----d--- + * ssssssss ssssssss ssss---- -----z-- + * + * Small: + * rrrrrrrr rrrrrrrr rrrr---- -------a + * rrrrrrrr rrrrrrrr rrrr---- -------a + * rrrrrrrr rrrrrrrr rrrr---- -------a + * + * Large: + * ssssssss ssssssss ssss---- ------la + * -------- -------- -------- ------la + * -------- -------- -------- ------la + */ + size_t bits; + +/* Note that CHUNK_MAP_DECOMMITTED's meaning varies depending on whether + * MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are defined. + * + * If MALLOC_DECOMMIT is defined, a page which is CHUNK_MAP_DECOMMITTED must be + * re-committed with pages_commit() before it may be touched. If + * MALLOC_DECOMMIT is defined, MALLOC_DOUBLE_PURGE may not be defined. + * + * If neither MALLOC_DECOMMIT nor MALLOC_DOUBLE_PURGE is defined, pages which + * are madvised (with either MADV_DONTNEED or MADV_FREE) are marked with + * CHUNK_MAP_MADVISED. + * + * Otherwise, if MALLOC_DECOMMIT is not defined and MALLOC_DOUBLE_PURGE is + * defined, then a page which is madvised is marked as CHUNK_MAP_MADVISED. + * When it's finally freed with jemalloc_purge_freed_pages, the page is marked + * as CHUNK_MAP_DECOMMITTED. + */ +#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) || defined(MALLOC_DOUBLE_PURGE) +#define CHUNK_MAP_MADVISED ((size_t)0x40U) +#define CHUNK_MAP_DECOMMITTED ((size_t)0x20U) +#define CHUNK_MAP_MADVISED_OR_DECOMMITTED (CHUNK_MAP_MADVISED | CHUNK_MAP_DECOMMITTED) +#endif +#define CHUNK_MAP_KEY ((size_t)0x10U) +#define CHUNK_MAP_DIRTY ((size_t)0x08U) +#define CHUNK_MAP_ZEROED ((size_t)0x04U) +#define CHUNK_MAP_LARGE ((size_t)0x02U) +#define CHUNK_MAP_ALLOCATED ((size_t)0x01U) +}; +typedef rb_tree(arena_chunk_map_t) arena_avail_tree_t; +typedef rb_tree(arena_chunk_map_t) arena_run_tree_t; + +/* Arena chunk header. */ +typedef struct arena_chunk_s arena_chunk_t; +struct arena_chunk_s { + /* Arena that owns the chunk. */ + arena_t *arena; + + /* Linkage for the arena's chunks_dirty tree. */ + rb_node(arena_chunk_t) link_dirty; + +#ifdef MALLOC_DOUBLE_PURGE + /* If we're double-purging, we maintain a linked list of chunks which + * have pages which have been madvise(MADV_FREE)'d but not explicitly + * purged. + * + * We're currently lazy and don't remove a chunk from this list when + * all its madvised pages are recommitted. */ + LinkedList chunks_madvised_elem; +#endif + + /* Number of dirty pages. */ + size_t ndirty; + + /* Map of pages within chunk that keeps track of free/large/small. */ + arena_chunk_map_t map[1]; /* Dynamically sized. */ +}; +typedef rb_tree(arena_chunk_t) arena_chunk_tree_t; + +typedef struct arena_run_s arena_run_t; +struct arena_run_s { +#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS) + uint32_t magic; +# define ARENA_RUN_MAGIC 0x384adf93 +#endif + + /* Bin this run is associated with. */ + arena_bin_t *bin; + + /* Index of first element that might have a free region. */ + unsigned regs_minelm; + + /* Number of free regions in run. */ + unsigned nfree; + + /* Bitmask of in-use regions (0: in use, 1: free). */ + unsigned regs_mask[1]; /* Dynamically sized. */ +}; + +struct arena_bin_s { + /* + * Current run being used to service allocations of this bin's size + * class. + */ + arena_run_t *runcur; + + /* + * Tree of non-full runs. This tree is used when looking for an + * existing run when runcur is no longer usable. We choose the + * non-full run that is lowest in memory; this policy tends to keep + * objects packed well, and it can also help reduce the number of + * almost-empty chunks. + */ + arena_run_tree_t runs; + + /* Size of regions in a run for this bin's size class. */ + size_t reg_size; + + /* Total size of a run for this bin's size class. */ + size_t run_size; + + /* Total number of regions in a run for this bin's size class. */ + uint32_t nregs; + + /* Number of elements in a run's regs_mask for this bin's size class. */ + uint32_t regs_mask_nelms; + + /* Offset of first region in a run for this bin's size class. */ + uint32_t reg0_offset; + +#ifdef MALLOC_STATS + /* Bin statistics. */ + malloc_bin_stats_t stats; +#endif +}; + +struct arena_s { +#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS) + uint32_t magic; +# define ARENA_MAGIC 0x947d3d24 +#endif + + /* All operations on this arena require that lock be locked. */ +#ifdef MOZ_MEMORY + malloc_spinlock_t lock; +#else + pthread_mutex_t lock; +#endif + +#ifdef MALLOC_STATS + arena_stats_t stats; +#endif + + /* Tree of dirty-page-containing chunks this arena manages. */ + arena_chunk_tree_t chunks_dirty; + +#ifdef MALLOC_DOUBLE_PURGE + /* Head of a linked list of MADV_FREE'd-page-containing chunks this + * arena manages. */ + LinkedList chunks_madvised; +#endif + + /* + * In order to avoid rapid chunk allocation/deallocation when an arena + * oscillates right on the cusp of needing a new chunk, cache the most + * recently freed chunk. The spare is left in the arena's chunk trees + * until it is deleted. + * + * There is one spare chunk per arena, rather than one spare total, in + * order to avoid interactions between multiple threads that could make + * a single spare inadequate. + */ + arena_chunk_t *spare; + + /* + * Current count of pages within unused runs that are potentially + * dirty, and for which madvise(... MADV_FREE) has not been called. By + * tracking this, we can institute a limit on how much dirty unused + * memory is mapped for each arena. + */ + size_t ndirty; + + /* + * Size/address-ordered tree of this arena's available runs. This tree + * is used for first-best-fit run allocation. + */ + arena_avail_tree_t runs_avail; + +#ifdef MALLOC_BALANCE + /* + * The arena load balancing machinery needs to keep track of how much + * lock contention there is. This value is exponentially averaged. + */ + uint32_t contention; +#endif + + /* + * bins is used to store rings of free regions of the following sizes, + * assuming a 16-byte quantum, 4kB pagesize, and default MALLOC_OPTIONS. + * + * bins[i] | size | + * --------+------+ + * 0 | 2 | + * 1 | 4 | + * 2 | 8 | + * --------+------+ + * 3 | 16 | + * 4 | 32 | + * 5 | 48 | + * 6 | 64 | + * : : + * : : + * 33 | 496 | + * 34 | 512 | + * --------+------+ + * 35 | 1024 | + * 36 | 2048 | + * --------+------+ + */ + arena_bin_t bins[1]; /* Dynamically sized. */ +}; + +/******************************************************************************/ +/* + * Data. + */ + +#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE +/* Number of CPUs. */ +static unsigned ncpus; +#endif + +#ifdef JEMALLOC_MUNMAP +static const bool config_munmap = true; +#else +static const bool config_munmap = false; +#endif + +#ifdef JEMALLOC_RECYCLE +static const bool config_recycle = true; +#else +static const bool config_recycle = false; +#endif + +/* + * When MALLOC_STATIC_SIZES is defined most of the parameters + * controlling the malloc behavior are defined as compile-time constants + * for best performance and cannot be altered at runtime. + */ +#if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__) && !defined(__aarch64__) +#define MALLOC_STATIC_SIZES 1 +#endif + +#ifdef MALLOC_STATIC_SIZES + +/* + * VM page size. It must divide the runtime CPU page size or the code + * will abort. + * Platform specific page size conditions copied from js/public/HeapAPI.h + */ +#if (defined(SOLARIS) || defined(__FreeBSD__)) && \ + (defined(__sparc) || defined(__sparcv9) || defined(__ia64)) +#define pagesize_2pow ((size_t) 13) +#elif defined(__powerpc64__) +#define pagesize_2pow ((size_t) 16) +#else +#define pagesize_2pow ((size_t) 12) +#endif +#define pagesize ((size_t) 1 << pagesize_2pow) +#define pagesize_mask (pagesize - 1) + +/* Various quantum-related settings. */ + +#define QUANTUM_DEFAULT ((size_t) 1 << QUANTUM_2POW_MIN) +static const size_t quantum = QUANTUM_DEFAULT; +static const size_t quantum_mask = QUANTUM_DEFAULT - 1; + +/* Various bin-related settings. */ + +static const size_t small_min = (QUANTUM_DEFAULT >> 1) + 1; +static const size_t small_max = (size_t) SMALL_MAX_DEFAULT; + +/* Max size class for bins. */ +static const size_t bin_maxclass = pagesize >> 1; + + /* Number of (2^n)-spaced tiny bins. */ +static const unsigned ntbins = (unsigned) + (QUANTUM_2POW_MIN - TINY_MIN_2POW); + + /* Number of quantum-spaced bins. */ +static const unsigned nqbins = (unsigned) + (SMALL_MAX_DEFAULT >> QUANTUM_2POW_MIN); + +/* Number of (2^n)-spaced sub-page bins. */ +static const unsigned nsbins = (unsigned) + (pagesize_2pow - + SMALL_MAX_2POW_DEFAULT - 1); + +#else /* !MALLOC_STATIC_SIZES */ + +/* VM page size. */ +static size_t pagesize; +static size_t pagesize_mask; +static size_t pagesize_2pow; + +/* Various bin-related settings. */ +static size_t bin_maxclass; /* Max size class for bins. */ +static unsigned ntbins; /* Number of (2^n)-spaced tiny bins. */ +static unsigned nqbins; /* Number of quantum-spaced bins. */ +static unsigned nsbins; /* Number of (2^n)-spaced sub-page bins. */ +static size_t small_min; +static size_t small_max; + +/* Various quantum-related settings. */ +static size_t quantum; +static size_t quantum_mask; /* (quantum - 1). */ + +#endif + +/* Various chunk-related settings. */ + +/* + * Compute the header size such that it is large enough to contain the page map + * and enough nodes for the worst case: one node per non-header page plus one + * extra for situations where we briefly have one more node allocated than we + * will need. + */ +#define calculate_arena_header_size() \ + (sizeof(arena_chunk_t) + sizeof(arena_chunk_map_t) * (chunk_npages - 1)) + +#define calculate_arena_header_pages() \ + ((calculate_arena_header_size() >> pagesize_2pow) + \ + ((calculate_arena_header_size() & pagesize_mask) ? 1 : 0)) + +/* Max size class for arenas. */ +#define calculate_arena_maxclass() \ + (chunksize - (arena_chunk_header_npages << pagesize_2pow)) + +/* + * Recycle at most 128 chunks. With 1 MiB chunks, this means we retain at most + * 6.25% of the process address space on a 32-bit OS for later use. + */ +#define CHUNK_RECYCLE_LIMIT 128 + +#ifdef MALLOC_STATIC_SIZES +#define CHUNKSIZE_DEFAULT ((size_t) 1 << CHUNK_2POW_DEFAULT) +static const size_t chunksize = CHUNKSIZE_DEFAULT; +static const size_t chunksize_mask =CHUNKSIZE_DEFAULT - 1; +static const size_t chunk_npages = CHUNKSIZE_DEFAULT >> pagesize_2pow; +#define arena_chunk_header_npages calculate_arena_header_pages() +#define arena_maxclass calculate_arena_maxclass() +static const size_t recycle_limit = CHUNK_RECYCLE_LIMIT * CHUNKSIZE_DEFAULT; +#else +static size_t chunksize; +static size_t chunksize_mask; /* (chunksize - 1). */ +static size_t chunk_npages; +static size_t arena_chunk_header_npages; +static size_t arena_maxclass; /* Max size class for arenas. */ +static size_t recycle_limit; +#endif + +/* The current amount of recycled bytes, updated atomically. */ +static size_t recycled_size; + +/********/ +/* + * Chunks. + */ + +#ifdef MALLOC_VALIDATE +static malloc_rtree_t *chunk_rtree; +#endif + +/* Protects chunk-related data structures. */ +static malloc_mutex_t chunks_mtx; + +/* + * Trees of chunks that were previously allocated (trees differ only in node + * ordering). These are used when allocating chunks, in an attempt to re-use + * address space. Depending on function, different tree orderings are needed, + * which is why there are two trees with the same contents. + */ +static extent_tree_t chunks_szad_mmap; +static extent_tree_t chunks_ad_mmap; + +/* Protects huge allocation-related data structures. */ +static malloc_mutex_t huge_mtx; + +/* Tree of chunks that are stand-alone huge allocations. */ +static extent_tree_t huge; + +#ifdef MALLOC_STATS +/* Huge allocation statistics. */ +static uint64_t huge_nmalloc; +static uint64_t huge_ndalloc; +static size_t huge_allocated; +static size_t huge_mapped; +#endif + +/****************************/ +/* + * base (internal allocation). + */ + +/* + * Current pages that are being used for internal memory allocations. These + * pages are carved up in cacheline-size quanta, so that there is no chance of + * false cache line sharing. + */ +static void *base_pages; +static void *base_next_addr; +#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) +static void *base_next_decommitted; +#endif +static void *base_past_addr; /* Addr immediately past base_pages. */ +static extent_node_t *base_nodes; +static malloc_mutex_t base_mtx; +#ifdef MALLOC_STATS +static size_t base_mapped; +static size_t base_committed; +#endif + +/********/ +/* + * Arenas. + */ + +/* + * Arenas that are used to service external requests. Not all elements of the + * arenas array are necessarily used; arenas are created lazily as needed. + */ +static arena_t **arenas; +static unsigned narenas; +#ifndef NO_TLS +# ifdef MALLOC_BALANCE +static unsigned narenas_2pow; +# else +static unsigned next_arena; +# endif +#endif +#ifdef MOZ_MEMORY +static malloc_spinlock_t arenas_lock; /* Protects arenas initialization. */ +#else +static pthread_mutex_t arenas_lock; /* Protects arenas initialization. */ +#endif + +#ifndef NO_TLS +/* + * Map of pthread_self() --> arenas[???], used for selecting an arena to use + * for allocations. + */ +#ifndef MOZ_MEMORY_WINDOWS +static __thread arena_t *arenas_map; +#endif +#endif + +/*******************************/ +/* + * Runtime configuration options. + */ +MOZ_JEMALLOC_API +const char *_malloc_options = MOZ_MALLOC_OPTIONS; + +#ifndef MALLOC_PRODUCTION +static bool opt_abort = true; +#ifdef MALLOC_FILL +static bool opt_junk = true; +static bool opt_poison = true; +static bool opt_zero = false; +#endif +#else +static bool opt_abort = false; +#ifdef MALLOC_FILL +static const bool opt_junk = false; +static const bool opt_poison = true; +static const bool opt_zero = false; +#endif +#endif + +static size_t opt_dirty_max = DIRTY_MAX_DEFAULT; +#ifdef MALLOC_BALANCE +static uint64_t opt_balance_threshold = BALANCE_THRESHOLD_DEFAULT; +#endif +static bool opt_print_stats = false; +#ifdef MALLOC_STATIC_SIZES +#define opt_quantum_2pow QUANTUM_2POW_MIN +#define opt_small_max_2pow SMALL_MAX_2POW_DEFAULT +#define opt_chunk_2pow CHUNK_2POW_DEFAULT +#else +static size_t opt_quantum_2pow = QUANTUM_2POW_MIN; +static size_t opt_small_max_2pow = SMALL_MAX_2POW_DEFAULT; +static size_t opt_chunk_2pow = CHUNK_2POW_DEFAULT; +#endif +#ifdef MALLOC_UTRACE +static bool opt_utrace = false; +#endif +#ifdef MALLOC_SYSV +static bool opt_sysv = false; +#endif +#ifdef MALLOC_XMALLOC +static bool opt_xmalloc = false; +#endif +static int opt_narenas_lshift = 0; + +#ifdef MALLOC_UTRACE +typedef struct { + void *p; + size_t s; + void *r; +} malloc_utrace_t; + +#define UTRACE(a, b, c) \ + if (opt_utrace) { \ + malloc_utrace_t ut; \ + ut.p = (a); \ + ut.s = (b); \ + ut.r = (c); \ + utrace(&ut, sizeof(ut)); \ + } +#else +#define UTRACE(a, b, c) +#endif + +/******************************************************************************/ +/* + * Begin function prototypes for non-inline static functions. + */ + +static char *umax2s(uintmax_t x, unsigned base, char *s); +static bool malloc_mutex_init(malloc_mutex_t *mutex); +static bool malloc_spin_init(malloc_spinlock_t *lock); +static void wrtmessage(const char *p1, const char *p2, const char *p3, + const char *p4); +#ifdef MALLOC_STATS +#ifdef MOZ_MEMORY_DARWIN +/* Avoid namespace collision with OS X's malloc APIs. */ +#define malloc_printf moz_malloc_printf +#endif +static void malloc_printf(const char *format, ...); +#endif +static bool base_pages_alloc(size_t minsize); +static void *base_alloc(size_t size); +static void *base_calloc(size_t number, size_t size); +static extent_node_t *base_node_alloc(void); +static void base_node_dealloc(extent_node_t *node); +#ifdef MALLOC_STATS +static void stats_print(arena_t *arena); +#endif +static void *pages_map(void *addr, size_t size); +static void pages_unmap(void *addr, size_t size); +static void *chunk_alloc_mmap(size_t size, size_t alignment); +static void *chunk_recycle(extent_tree_t *chunks_szad, + extent_tree_t *chunks_ad, size_t size, + size_t alignment, bool base, bool *zero); +static void *chunk_alloc(size_t size, size_t alignment, bool base, bool zero); +static void chunk_record(extent_tree_t *chunks_szad, + extent_tree_t *chunks_ad, void *chunk, size_t size); +static bool chunk_dalloc_mmap(void *chunk, size_t size); +static void chunk_dealloc(void *chunk, size_t size); +#ifndef NO_TLS +static arena_t *choose_arena_hard(void); +#endif +static void arena_run_split(arena_t *arena, arena_run_t *run, size_t size, + bool large, bool zero); +static void arena_chunk_init(arena_t *arena, arena_chunk_t *chunk); +static void arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk); +static arena_run_t *arena_run_alloc(arena_t *arena, arena_bin_t *bin, + size_t size, bool large, bool zero); +static void arena_purge(arena_t *arena, bool all); +static void arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty); +static void arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk, + arena_run_t *run, size_t oldsize, size_t newsize); +static void arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk, + arena_run_t *run, size_t oldsize, size_t newsize, bool dirty); +static arena_run_t *arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin); +static void *arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin); +static size_t arena_bin_run_size_calc(arena_bin_t *bin, size_t min_run_size); +#ifdef MALLOC_BALANCE +static void arena_lock_balance_hard(arena_t *arena); +#endif +static void *arena_malloc_large(arena_t *arena, size_t size, bool zero); +static void *arena_palloc(arena_t *arena, size_t alignment, size_t size, + size_t alloc_size); +static size_t arena_salloc(const void *ptr); +static void arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk, + void *ptr); +static void arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk, + void *ptr, size_t size, size_t oldsize); +static bool arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, + void *ptr, size_t size, size_t oldsize); +static bool arena_ralloc_large(void *ptr, size_t size, size_t oldsize); +static void *arena_ralloc(void *ptr, size_t size, size_t oldsize); +static bool arena_new(arena_t *arena); +static arena_t *arenas_extend(unsigned ind); +static void *huge_malloc(size_t size, bool zero); +static void *huge_palloc(size_t size, size_t alignment, bool zero); +static void *huge_ralloc(void *ptr, size_t size, size_t oldsize); +static void huge_dalloc(void *ptr); +static void malloc_print_stats(void); +#ifndef MOZ_MEMORY_WINDOWS +static +#endif +bool malloc_init_hard(void); + +static void _malloc_prefork(void); +static void _malloc_postfork(void); + +#ifdef MOZ_MEMORY_DARWIN +/* + * MALLOC_ZONE_T_NOTE + * + * On Darwin, we hook into the memory allocator using a malloc_zone_t struct. + * We must be very careful around this struct because of different behaviour on + * different versions of OSX. + * + * Each of OSX 10.5, 10.6 and 10.7 use different versions of the struct + * (with version numbers 3, 6 and 8 respectively). The binary we use on each of + * these platforms will not necessarily be built using the correct SDK [1]. + * This means we need to statically know the correct struct size to use on all + * OSX releases, and have a fallback for unknown future versions. The struct + * sizes defined in osx_zone_types.h. + * + * For OSX 10.8 and later, we may expect the malloc_zone_t struct to change + * again, and need to dynamically account for this. By simply leaving + * malloc_zone_t alone, we don't quite deal with the problem, because there + * remain calls to jemalloc through the mozalloc interface. We check this + * dynamically on each allocation, using the CHECK_DARWIN macro and + * osx_use_jemalloc. + * + * + * [1] Mozilla is built as a universal binary on Mac, supporting i386 and + * x86_64. The i386 target is built using the 10.5 SDK, even if it runs on + * 10.6. The x86_64 target is built using the 10.6 SDK, even if it runs on + * 10.7 or later, or 10.5. + * + * FIXME: + * When later versions of OSX come out (10.8 and up), we need to check their + * malloc_zone_t versions. If they're greater than 8, we need a new version + * of malloc_zone_t adapted into osx_zone_types.h. + */ + +#ifndef MOZ_REPLACE_MALLOC +#include "osx_zone_types.h" + +#define LEOPARD_MALLOC_ZONE_T_VERSION 3 +#define SNOW_LEOPARD_MALLOC_ZONE_T_VERSION 6 +#define LION_MALLOC_ZONE_T_VERSION 8 + +static bool osx_use_jemalloc = false; + + +static lion_malloc_zone l_szone; +static malloc_zone_t * szone = (malloc_zone_t*)(&l_szone); + +static lion_malloc_introspection l_ozone_introspect; +static malloc_introspection_t * const ozone_introspect = + (malloc_introspection_t*)(&l_ozone_introspect); +static void szone2ozone(malloc_zone_t *zone, size_t size); +static size_t zone_version_size(int version); +#else +static const bool osx_use_jemalloc = true; +#endif + +#endif + +/* + * End function prototypes. + */ +/******************************************************************************/ + +static inline size_t +load_acquire_z(size_t *p) +{ + volatile size_t result = *p; +# ifdef MOZ_MEMORY_WINDOWS + /* + * We use InterlockedExchange with a dummy value to insert a memory + * barrier. This has been confirmed to generate the right instruction + * and is also used by MinGW. + */ + volatile long dummy = 0; + InterlockedExchange(&dummy, 1); +# else + __sync_synchronize(); +# endif + return result; +} + +/* + * umax2s() provides minimal integer printing functionality, which is + * especially useful for situations where allocation in vsnprintf() calls would + * potentially cause deadlock. + */ +#define UMAX2S_BUFSIZE 65 +char * +umax2s(uintmax_t x, unsigned base, char *s) +{ + unsigned i; + + i = UMAX2S_BUFSIZE - 1; + s[i] = '\0'; + switch (base) { + case 10: + do { + i--; + s[i] = "0123456789"[x % 10]; + x /= 10; + } while (x > 0); + break; + case 16: + do { + i--; + s[i] = "0123456789abcdef"[x & 0xf]; + x >>= 4; + } while (x > 0); + break; + default: + do { + i--; + s[i] = "0123456789abcdefghijklmnopqrstuvwxyz"[x % base]; + x /= base; + } while (x > 0); + } + + return (&s[i]); +} + +static void +wrtmessage(const char *p1, const char *p2, const char *p3, const char *p4) +{ +#if defined(MOZ_MEMORY) && !defined(MOZ_MEMORY_WINDOWS) +#define _write write +#endif + // Pretend to check _write() errors to suppress gcc warnings about + // warn_unused_result annotations in some versions of glibc headers. + if (_write(STDERR_FILENO, p1, (unsigned int) strlen(p1)) < 0) + return; + if (_write(STDERR_FILENO, p2, (unsigned int) strlen(p2)) < 0) + return; + if (_write(STDERR_FILENO, p3, (unsigned int) strlen(p3)) < 0) + return; + if (_write(STDERR_FILENO, p4, (unsigned int) strlen(p4)) < 0) + return; +} + +MOZ_JEMALLOC_API +void (*_malloc_message)(const char *p1, const char *p2, const char *p3, + const char *p4) = wrtmessage; + +#include "mozilla/Assertions.h" +#include "mozilla/Attributes.h" +#include "mozilla/TaggedAnonymousMemory.h" +// Note: MozTaggedAnonymousMmap() could call an LD_PRELOADed mmap +// instead of the one defined here; use only MozTagAnonymousMemory(). + +#ifdef MALLOC_DEBUG +# define assert(e) MOZ_ASSERT(e) +#else +# define assert(e) +#endif + +#ifdef MOZ_MEMORY_ANDROID +// Android's pthread.h does not declare pthread_atfork() until SDK 21. +extern MOZ_EXPORT +int pthread_atfork(void (*)(void), void (*)(void), void(*)(void)); +#endif + +#if defined(MOZ_JEMALLOC_HARD_ASSERTS) +# define RELEASE_ASSERT(assertion) do { \ + if (!(assertion)) { \ + MOZ_CRASH_UNSAFE_OOL(#assertion); \ + } \ +} while (0) +#else +# define RELEASE_ASSERT(assertion) assert(assertion) +#endif + +/******************************************************************************/ +/* + * Begin mutex. We can't use normal pthread mutexes in all places, because + * they require malloc()ed memory, which causes bootstrapping issues in some + * cases. + */ + +static bool +malloc_mutex_init(malloc_mutex_t *mutex) +{ +#if defined(MOZ_MEMORY_WINDOWS) + if (isthreaded) + if (! __crtInitCritSecAndSpinCount(mutex, _CRT_SPINCOUNT)) + return (true); +#elif defined(MOZ_MEMORY_DARWIN) + mutex->lock = OS_SPINLOCK_INIT; +#elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID) + pthread_mutexattr_t attr; + if (pthread_mutexattr_init(&attr) != 0) + return (true); + pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP); + if (pthread_mutex_init(mutex, &attr) != 0) { + pthread_mutexattr_destroy(&attr); + return (true); + } + pthread_mutexattr_destroy(&attr); +#elif defined(MOZ_MEMORY) + if (pthread_mutex_init(mutex, NULL) != 0) + return (true); +#else + static const spinlock_t lock = _SPINLOCK_INITIALIZER; + + mutex->lock = lock; +#endif + return (false); +} + +static inline void +malloc_mutex_lock(malloc_mutex_t *mutex) +{ + +#if defined(MOZ_MEMORY_WINDOWS) + EnterCriticalSection(mutex); +#elif defined(MOZ_MEMORY_DARWIN) + OSSpinLockLock(&mutex->lock); +#elif defined(MOZ_MEMORY) + pthread_mutex_lock(mutex); +#else + if (isthreaded) + _SPINLOCK(&mutex->lock); +#endif +} + +static inline void +malloc_mutex_unlock(malloc_mutex_t *mutex) +{ + +#if defined(MOZ_MEMORY_WINDOWS) + LeaveCriticalSection(mutex); +#elif defined(MOZ_MEMORY_DARWIN) + OSSpinLockUnlock(&mutex->lock); +#elif defined(MOZ_MEMORY) + pthread_mutex_unlock(mutex); +#else + if (isthreaded) + _SPINUNLOCK(&mutex->lock); +#endif +} + +#if (defined(__GNUC__)) +__attribute__((unused)) +# endif +static bool +malloc_spin_init(malloc_spinlock_t *lock) +{ +#if defined(MOZ_MEMORY_WINDOWS) + if (isthreaded) + if (! __crtInitCritSecAndSpinCount(lock, _CRT_SPINCOUNT)) + return (true); +#elif defined(MOZ_MEMORY_DARWIN) + lock->lock = OS_SPINLOCK_INIT; +#elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID) + pthread_mutexattr_t attr; + if (pthread_mutexattr_init(&attr) != 0) + return (true); + pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP); + if (pthread_mutex_init(lock, &attr) != 0) { + pthread_mutexattr_destroy(&attr); + return (true); + } + pthread_mutexattr_destroy(&attr); +#elif defined(MOZ_MEMORY) + if (pthread_mutex_init(lock, NULL) != 0) + return (true); +#else + lock->lock = _SPINLOCK_INITIALIZER; +#endif + return (false); +} + +static inline void +malloc_spin_lock(malloc_spinlock_t *lock) +{ + +#if defined(MOZ_MEMORY_WINDOWS) + EnterCriticalSection(lock); +#elif defined(MOZ_MEMORY_DARWIN) + OSSpinLockLock(&lock->lock); +#elif defined(MOZ_MEMORY) + pthread_mutex_lock(lock); +#else + if (isthreaded) + _SPINLOCK(&lock->lock); +#endif +} + +static inline void +malloc_spin_unlock(malloc_spinlock_t *lock) +{ +#if defined(MOZ_MEMORY_WINDOWS) + LeaveCriticalSection(lock); +#elif defined(MOZ_MEMORY_DARWIN) + OSSpinLockUnlock(&lock->lock); +#elif defined(MOZ_MEMORY) + pthread_mutex_unlock(lock); +#else + if (isthreaded) + _SPINUNLOCK(&lock->lock); +#endif +} + +/* + * End mutex. + */ +/******************************************************************************/ +/* + * Begin spin lock. Spin locks here are actually adaptive mutexes that block + * after a period of spinning, because unbounded spinning would allow for + * priority inversion. + */ + +#if defined(MOZ_MEMORY) && !defined(MOZ_MEMORY_DARWIN) +# define malloc_spin_init malloc_mutex_init +# define malloc_spin_lock malloc_mutex_lock +# define malloc_spin_unlock malloc_mutex_unlock +#endif + +#ifndef MOZ_MEMORY +/* + * We use an unpublished interface to initialize pthread mutexes with an + * allocation callback, in order to avoid infinite recursion. + */ +int _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex, + void *(calloc_cb)(size_t, size_t)); + +__weak_reference(_pthread_mutex_init_calloc_cb_stub, + _pthread_mutex_init_calloc_cb); + +int +_pthread_mutex_init_calloc_cb_stub(pthread_mutex_t *mutex, + void *(calloc_cb)(size_t, size_t)) +{ + + return (0); +} + +static bool +malloc_spin_init(pthread_mutex_t *lock) +{ + + if (_pthread_mutex_init_calloc_cb(lock, base_calloc) != 0) + return (true); + + return (false); +} + +static inline unsigned +malloc_spin_lock(pthread_mutex_t *lock) +{ + unsigned ret = 0; + + if (isthreaded) { + if (_pthread_mutex_trylock(lock) != 0) { + unsigned i; + volatile unsigned j; + + /* Exponentially back off. */ + for (i = 1; i <= SPIN_LIMIT_2POW; i++) { + for (j = 0; j < (1U << i); j++) + ret++; + + CPU_SPINWAIT; + if (_pthread_mutex_trylock(lock) == 0) + return (ret); + } + + /* + * Spinning failed. Block until the lock becomes + * available, in order to avoid indefinite priority + * inversion. + */ + _pthread_mutex_lock(lock); + assert((ret << BLOCK_COST_2POW) != 0); + return (ret << BLOCK_COST_2POW); + } + } + + return (ret); +} + +static inline void +malloc_spin_unlock(pthread_mutex_t *lock) +{ + + if (isthreaded) + _pthread_mutex_unlock(lock); +} +#endif + +/* + * End spin lock. + */ +/******************************************************************************/ +/* + * Begin Utility functions/macros. + */ + +/* Return the chunk address for allocation address a. */ +#define CHUNK_ADDR2BASE(a) \ + ((void *)((uintptr_t)(a) & ~chunksize_mask)) + +/* Return the chunk offset of address a. */ +#define CHUNK_ADDR2OFFSET(a) \ + ((size_t)((uintptr_t)(a) & chunksize_mask)) + +/* Return the smallest chunk multiple that is >= s. */ +#define CHUNK_CEILING(s) \ + (((s) + chunksize_mask) & ~chunksize_mask) + +/* Return the smallest cacheline multiple that is >= s. */ +#define CACHELINE_CEILING(s) \ + (((s) + (CACHELINE - 1)) & ~(CACHELINE - 1)) + +/* Return the smallest quantum multiple that is >= a. */ +#define QUANTUM_CEILING(a) \ + (((a) + quantum_mask) & ~quantum_mask) + +/* Return the smallest pagesize multiple that is >= s. */ +#define PAGE_CEILING(s) \ + (((s) + pagesize_mask) & ~pagesize_mask) + +/* Compute the smallest power of 2 that is >= x. */ +static inline size_t +pow2_ceil(size_t x) +{ + + x--; + x |= x >> 1; + x |= x >> 2; + x |= x >> 4; + x |= x >> 8; + x |= x >> 16; +#if (SIZEOF_PTR == 8) + x |= x >> 32; +#endif + x++; + return (x); +} + +#ifdef MALLOC_BALANCE +/* + * Use a simple linear congruential pseudo-random number generator: + * + * prn(y) = (a*x + c) % m + * + * where the following constants ensure maximal period: + * + * a == Odd number (relatively prime to 2^n), and (a-1) is a multiple of 4. + * c == Odd number (relatively prime to 2^n). + * m == 2^32 + * + * See Knuth's TAOCP 3rd Ed., Vol. 2, pg. 17 for details on these constraints. + * + * This choice of m has the disadvantage that the quality of the bits is + * proportional to bit position. For example. the lowest bit has a cycle of 2, + * the next has a cycle of 4, etc. For this reason, we prefer to use the upper + * bits. + */ +# define PRN_DEFINE(suffix, var, a, c) \ +static inline void \ +sprn_##suffix(uint32_t seed) \ +{ \ + var = seed; \ +} \ + \ +static inline uint32_t \ +prn_##suffix(uint32_t lg_range) \ +{ \ + uint32_t ret, x; \ + \ + assert(lg_range > 0); \ + assert(lg_range <= 32); \ + \ + x = (var * (a)) + (c); \ + var = x; \ + ret = x >> (32 - lg_range); \ + \ + return (ret); \ +} +# define SPRN(suffix, seed) sprn_##suffix(seed) +# define PRN(suffix, lg_range) prn_##suffix(lg_range) +#endif + +#ifdef MALLOC_BALANCE +/* Define the PRNG used for arena assignment. */ +static __thread uint32_t balance_x; +PRN_DEFINE(balance, balance_x, 1297, 1301) +#endif + +#ifdef MALLOC_UTRACE +static int +utrace(const void *addr, size_t len) +{ + malloc_utrace_t *ut = (malloc_utrace_t *)addr; + char buf_a[UMAX2S_BUFSIZE]; + char buf_b[UMAX2S_BUFSIZE]; + + assert(len == sizeof(malloc_utrace_t)); + + if (ut->p == NULL && ut->s == 0 && ut->r == NULL) { + _malloc_message( + umax2s(getpid(), 10, buf_a), + " x USER malloc_init()\n", "", ""); + } else if (ut->p == NULL && ut->r != NULL) { + _malloc_message( + umax2s(getpid(), 10, buf_a), + " x USER 0x", + umax2s((uintptr_t)ut->r, 16, buf_b), + " = malloc("); + _malloc_message( + umax2s(ut->s, 10, buf_a), + ")\n", "", ""); + } else if (ut->p != NULL && ut->r != NULL) { + _malloc_message( + umax2s(getpid(), 10, buf_a), + " x USER 0x", + umax2s((uintptr_t)ut->r, 16, buf_b), + " = realloc(0x"); + _malloc_message( + umax2s((uintptr_t)ut->p, 16, buf_a), + ", ", + umax2s(ut->s, 10, buf_b), + ")\n"); + } else { + _malloc_message( + umax2s(getpid(), 10, buf_a), + " x USER free(0x", + umax2s((uintptr_t)ut->p, 16, buf_b), + ")\n"); + } + + return (0); +} +#endif + +static inline const char * +_getprogname(void) +{ + + return ("<jemalloc>"); +} + +#ifdef MALLOC_STATS +/* + * Print to stderr in such a way as to (hopefully) avoid memory allocation. + */ +static void +malloc_printf(const char *format, ...) +{ + char buf[4096]; + va_list ap; + + va_start(ap, format); + vsnprintf(buf, sizeof(buf), format, ap); + va_end(ap); + _malloc_message(buf, "", "", ""); +} +#endif + +/******************************************************************************/ + +static inline void +pages_decommit(void *addr, size_t size) +{ + +#ifdef MOZ_MEMORY_WINDOWS + /* + * The region starting at addr may have been allocated in multiple calls + * to VirtualAlloc and recycled, so decommitting the entire region in one + * go may not be valid. However, since we allocate at least a chunk at a + * time, we may touch any region in chunksized increments. + */ + size_t pages_size = min(size, chunksize - + CHUNK_ADDR2OFFSET((uintptr_t)addr)); + while (size > 0) { + if (!VirtualFree(addr, pages_size, MEM_DECOMMIT)) + abort(); + addr = (void *)((uintptr_t)addr + pages_size); + size -= pages_size; + pages_size = min(size, chunksize); + } +#else + if (mmap(addr, size, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, + 0) == MAP_FAILED) + abort(); + MozTagAnonymousMemory(addr, size, "jemalloc-decommitted"); +#endif +} + +static inline void +pages_commit(void *addr, size_t size) +{ + +# ifdef MOZ_MEMORY_WINDOWS + /* + * The region starting at addr may have been allocated in multiple calls + * to VirtualAlloc and recycled, so committing the entire region in one + * go may not be valid. However, since we allocate at least a chunk at a + * time, we may touch any region in chunksized increments. + */ + size_t pages_size = min(size, chunksize - + CHUNK_ADDR2OFFSET((uintptr_t)addr)); + while (size > 0) { + if (!VirtualAlloc(addr, pages_size, MEM_COMMIT, PAGE_READWRITE)) + abort(); + addr = (void *)((uintptr_t)addr + pages_size); + size -= pages_size; + pages_size = min(size, chunksize); + } +# else + if (mmap(addr, size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | + MAP_ANON, -1, 0) == MAP_FAILED) + abort(); + MozTagAnonymousMemory(addr, size, "jemalloc"); +# endif +} + +static bool +base_pages_alloc(size_t minsize) +{ + size_t csize; +#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) + size_t pminsize; +#endif + + assert(minsize != 0); + csize = CHUNK_CEILING(minsize); + base_pages = chunk_alloc(csize, chunksize, true, false); + if (base_pages == NULL) + return (true); + base_next_addr = base_pages; + base_past_addr = (void *)((uintptr_t)base_pages + csize); +#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) + /* + * Leave enough pages for minsize committed, since otherwise they would + * have to be immediately recommitted. + */ + pminsize = PAGE_CEILING(minsize); + base_next_decommitted = (void *)((uintptr_t)base_pages + pminsize); +# if defined(MALLOC_DECOMMIT) + if (pminsize < csize) + pages_decommit(base_next_decommitted, csize - pminsize); +# endif +# ifdef MALLOC_STATS + base_mapped += csize; + base_committed += pminsize; +# endif +#endif + + return (false); +} + +static void * +base_alloc(size_t size) +{ + void *ret; + size_t csize; + + /* Round size up to nearest multiple of the cacheline size. */ + csize = CACHELINE_CEILING(size); + + malloc_mutex_lock(&base_mtx); + /* Make sure there's enough space for the allocation. */ + if ((uintptr_t)base_next_addr + csize > (uintptr_t)base_past_addr) { + if (base_pages_alloc(csize)) { + malloc_mutex_unlock(&base_mtx); + return (NULL); + } + } + /* Allocate. */ + ret = base_next_addr; + base_next_addr = (void *)((uintptr_t)base_next_addr + csize); +#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) + /* Make sure enough pages are committed for the new allocation. */ + if ((uintptr_t)base_next_addr > (uintptr_t)base_next_decommitted) { + void *pbase_next_addr = + (void *)(PAGE_CEILING((uintptr_t)base_next_addr)); + +# ifdef MALLOC_DECOMMIT + pages_commit(base_next_decommitted, (uintptr_t)pbase_next_addr - + (uintptr_t)base_next_decommitted); +# endif + base_next_decommitted = pbase_next_addr; +# ifdef MALLOC_STATS + base_committed += (uintptr_t)pbase_next_addr - + (uintptr_t)base_next_decommitted; +# endif + } +#endif + malloc_mutex_unlock(&base_mtx); + + return (ret); +} + +static void * +base_calloc(size_t number, size_t size) +{ + void *ret; + + ret = base_alloc(number * size); + memset(ret, 0, number * size); + + return (ret); +} + +static extent_node_t * +base_node_alloc(void) +{ + extent_node_t *ret; + + malloc_mutex_lock(&base_mtx); + if (base_nodes != NULL) { + ret = base_nodes; + base_nodes = *(extent_node_t **)ret; + malloc_mutex_unlock(&base_mtx); + } else { + malloc_mutex_unlock(&base_mtx); + ret = (extent_node_t *)base_alloc(sizeof(extent_node_t)); + } + + return (ret); +} + +static void +base_node_dealloc(extent_node_t *node) +{ + + malloc_mutex_lock(&base_mtx); + *(extent_node_t **)node = base_nodes; + base_nodes = node; + malloc_mutex_unlock(&base_mtx); +} + +/******************************************************************************/ + +#ifdef MALLOC_STATS +static void +stats_print(arena_t *arena) +{ + unsigned i, gap_start; + +#ifdef MOZ_MEMORY_WINDOWS + malloc_printf("dirty: %Iu page%s dirty, %I64u sweep%s," + " %I64u madvise%s, %I64u page%s purged\n", + arena->ndirty, arena->ndirty == 1 ? "" : "s", + arena->stats.npurge, arena->stats.npurge == 1 ? "" : "s", + arena->stats.nmadvise, arena->stats.nmadvise == 1 ? "" : "s", + arena->stats.purged, arena->stats.purged == 1 ? "" : "s"); +# ifdef MALLOC_DECOMMIT + malloc_printf("decommit: %I64u decommit%s, %I64u commit%s," + " %I64u page%s decommitted\n", + arena->stats.ndecommit, (arena->stats.ndecommit == 1) ? "" : "s", + arena->stats.ncommit, (arena->stats.ncommit == 1) ? "" : "s", + arena->stats.decommitted, + (arena->stats.decommitted == 1) ? "" : "s"); +# endif + + malloc_printf(" allocated nmalloc ndalloc\n"); + malloc_printf("small: %12Iu %12I64u %12I64u\n", + arena->stats.allocated_small, arena->stats.nmalloc_small, + arena->stats.ndalloc_small); + malloc_printf("large: %12Iu %12I64u %12I64u\n", + arena->stats.allocated_large, arena->stats.nmalloc_large, + arena->stats.ndalloc_large); + malloc_printf("total: %12Iu %12I64u %12I64u\n", + arena->stats.allocated_small + arena->stats.allocated_large, + arena->stats.nmalloc_small + arena->stats.nmalloc_large, + arena->stats.ndalloc_small + arena->stats.ndalloc_large); + malloc_printf("mapped: %12Iu\n", arena->stats.mapped); +#else + malloc_printf("dirty: %zu page%s dirty, %llu sweep%s," + " %llu madvise%s, %llu page%s purged\n", + arena->ndirty, arena->ndirty == 1 ? "" : "s", + arena->stats.npurge, arena->stats.npurge == 1 ? "" : "s", + arena->stats.nmadvise, arena->stats.nmadvise == 1 ? "" : "s", + arena->stats.purged, arena->stats.purged == 1 ? "" : "s"); +# ifdef MALLOC_DECOMMIT + malloc_printf("decommit: %llu decommit%s, %llu commit%s," + " %llu page%s decommitted\n", + arena->stats.ndecommit, (arena->stats.ndecommit == 1) ? "" : "s", + arena->stats.ncommit, (arena->stats.ncommit == 1) ? "" : "s", + arena->stats.decommitted, + (arena->stats.decommitted == 1) ? "" : "s"); +# endif + + malloc_printf(" allocated nmalloc ndalloc\n"); + malloc_printf("small: %12zu %12llu %12llu\n", + arena->stats.allocated_small, arena->stats.nmalloc_small, + arena->stats.ndalloc_small); + malloc_printf("large: %12zu %12llu %12llu\n", + arena->stats.allocated_large, arena->stats.nmalloc_large, + arena->stats.ndalloc_large); + malloc_printf("total: %12zu %12llu %12llu\n", + arena->stats.allocated_small + arena->stats.allocated_large, + arena->stats.nmalloc_small + arena->stats.nmalloc_large, + arena->stats.ndalloc_small + arena->stats.ndalloc_large); + malloc_printf("mapped: %12zu\n", arena->stats.mapped); +#endif + malloc_printf("bins: bin size regs pgs requests newruns" + " reruns maxruns curruns\n"); + for (i = 0, gap_start = UINT_MAX; i < ntbins + nqbins + nsbins; i++) { + if (arena->bins[i].stats.nrequests == 0) { + if (gap_start == UINT_MAX) + gap_start = i; + } else { + if (gap_start != UINT_MAX) { + if (i > gap_start + 1) { + /* Gap of more than one size class. */ + malloc_printf("[%u..%u]\n", + gap_start, i - 1); + } else { + /* Gap of one size class. */ + malloc_printf("[%u]\n", gap_start); + } + gap_start = UINT_MAX; + } + malloc_printf( +#if defined(MOZ_MEMORY_WINDOWS) + "%13u %1s %4u %4u %3u %9I64u %9I64u" + " %9I64u %7u %7u\n", +#else + "%13u %1s %4u %4u %3u %9llu %9llu" + " %9llu %7lu %7lu\n", +#endif + i, + i < ntbins ? "T" : i < ntbins + nqbins ? "Q" : "S", + arena->bins[i].reg_size, + arena->bins[i].nregs, + arena->bins[i].run_size >> pagesize_2pow, + arena->bins[i].stats.nrequests, + arena->bins[i].stats.nruns, + arena->bins[i].stats.reruns, + arena->bins[i].stats.highruns, + arena->bins[i].stats.curruns); + } + } + if (gap_start != UINT_MAX) { + if (i > gap_start + 1) { + /* Gap of more than one size class. */ + malloc_printf("[%u..%u]\n", gap_start, i - 1); + } else { + /* Gap of one size class. */ + malloc_printf("[%u]\n", gap_start); + } + } +} +#endif + +/* + * End Utility functions/macros. + */ +/******************************************************************************/ +/* + * Begin extent tree code. + */ + +static inline int +extent_szad_comp(extent_node_t *a, extent_node_t *b) +{ + int ret; + size_t a_size = a->size; + size_t b_size = b->size; + + ret = (a_size > b_size) - (a_size < b_size); + if (ret == 0) { + uintptr_t a_addr = (uintptr_t)a->addr; + uintptr_t b_addr = (uintptr_t)b->addr; + + ret = (a_addr > b_addr) - (a_addr < b_addr); + } + + return (ret); +} + +/* Wrap red-black tree macros in functions. */ +rb_wrap(static, extent_tree_szad_, extent_tree_t, extent_node_t, + link_szad, extent_szad_comp) + +static inline int +extent_ad_comp(extent_node_t *a, extent_node_t *b) +{ + uintptr_t a_addr = (uintptr_t)a->addr; + uintptr_t b_addr = (uintptr_t)b->addr; + + return ((a_addr > b_addr) - (a_addr < b_addr)); +} + +/* Wrap red-black tree macros in functions. */ +rb_wrap(static, extent_tree_ad_, extent_tree_t, extent_node_t, link_ad, + extent_ad_comp) + +/* + * End extent tree code. + */ +/******************************************************************************/ +/* + * Begin chunk management functions. + */ + +#ifdef MOZ_MEMORY_WINDOWS + +static void * +pages_map(void *addr, size_t size) +{ + void *ret = NULL; + ret = VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE, + PAGE_READWRITE); + return (ret); +} + +static void +pages_unmap(void *addr, size_t size) +{ + if (VirtualFree(addr, 0, MEM_RELEASE) == 0) { + _malloc_message(_getprogname(), + ": (malloc) Error in VirtualFree()\n", "", ""); + if (opt_abort) + abort(); + } +} +#else +#ifdef JEMALLOC_USES_MAP_ALIGN +static void * +pages_map_align(size_t size, size_t alignment) +{ + void *ret; + + /* + * We don't use MAP_FIXED here, because it can cause the *replacement* + * of existing mappings, and we only want to create new mappings. + */ + ret = mmap((void *)alignment, size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_NOSYNC | MAP_ALIGN | MAP_ANON, -1, 0); + assert(ret != NULL); + + if (ret == MAP_FAILED) + ret = NULL; + else + MozTagAnonymousMemory(ret, size, "jemalloc"); + return (ret); +} +#endif + +static void * +pages_map(void *addr, size_t size) +{ + void *ret; +#if defined(__ia64__) + /* + * The JS engine assumes that all allocated pointers have their high 17 bits clear, + * which ia64's mmap doesn't support directly. However, we can emulate it by passing + * mmap an "addr" parameter with those bits clear. The mmap will return that address, + * or the nearest available memory above that address, providing a near-guarantee + * that those bits are clear. If they are not, we return NULL below to indicate + * out-of-memory. + * + * The addr is chosen as 0x0000070000000000, which still allows about 120TB of virtual + * address space. + * + * See Bug 589735 for more information. + */ + bool check_placement = true; + if (addr == NULL) { + addr = (void*)0x0000070000000000; + check_placement = false; + } +#endif + + /* + * We don't use MAP_FIXED here, because it can cause the *replacement* + * of existing mappings, and we only want to create new mappings. + */ + ret = mmap(addr, size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON, -1, 0); + assert(ret != NULL); + + if (ret == MAP_FAILED) { + ret = NULL; + } +#if defined(__ia64__) + /* + * If the allocated memory doesn't have its upper 17 bits clear, consider it + * as out of memory. + */ + else if ((long long)ret & 0xffff800000000000) { + munmap(ret, size); + ret = NULL; + } + /* If the caller requested a specific memory location, verify that's what mmap returned. */ + else if (check_placement && ret != addr) { +#else + else if (addr != NULL && ret != addr) { +#endif + /* + * We succeeded in mapping memory, but not in the right place. + */ + if (munmap(ret, size) == -1) { + char buf[STRERROR_BUF]; + + if (strerror_r(errno, buf, sizeof(buf)) == 0) { + _malloc_message(_getprogname(), + ": (malloc) Error in munmap(): ", buf, "\n"); + } + if (opt_abort) + abort(); + } + ret = NULL; + } + if (ret != NULL) { + MozTagAnonymousMemory(ret, size, "jemalloc"); + } + +#if defined(__ia64__) + assert(ret == NULL || (!check_placement && ret != NULL) + || (check_placement && ret == addr)); +#else + assert(ret == NULL || (addr == NULL && ret != addr) + || (addr != NULL && ret == addr)); +#endif + return (ret); +} + +static void +pages_unmap(void *addr, size_t size) +{ + + if (munmap(addr, size) == -1) { + char buf[STRERROR_BUF]; + + if (strerror_r(errno, buf, sizeof(buf)) == 0) { + _malloc_message(_getprogname(), + ": (malloc) Error in munmap(): ", buf, "\n"); + } + if (opt_abort) + abort(); + } +} +#endif + +#ifdef MOZ_MEMORY_DARWIN +#define VM_COPY_MIN (pagesize << 5) +static inline void +pages_copy(void *dest, const void *src, size_t n) +{ + + assert((void *)((uintptr_t)dest & ~pagesize_mask) == dest); + assert(n >= VM_COPY_MIN); + assert((void *)((uintptr_t)src & ~pagesize_mask) == src); + + vm_copy(mach_task_self(), (vm_address_t)src, (vm_size_t)n, + (vm_address_t)dest); +} +#endif + +#ifdef MALLOC_VALIDATE +static inline malloc_rtree_t * +malloc_rtree_new(unsigned bits) +{ + malloc_rtree_t *ret; + unsigned bits_per_level, height, i; + + bits_per_level = ffs(pow2_ceil((MALLOC_RTREE_NODESIZE / + sizeof(void *)))) - 1; + height = bits / bits_per_level; + if (height * bits_per_level != bits) + height++; + RELEASE_ASSERT(height * bits_per_level >= bits); + + ret = (malloc_rtree_t*)base_calloc(1, sizeof(malloc_rtree_t) + + (sizeof(unsigned) * (height - 1))); + if (ret == NULL) + return (NULL); + + malloc_spin_init(&ret->lock); + ret->height = height; + if (bits_per_level * height > bits) + ret->level2bits[0] = bits % bits_per_level; + else + ret->level2bits[0] = bits_per_level; + for (i = 1; i < height; i++) + ret->level2bits[i] = bits_per_level; + + ret->root = (void**)base_calloc(1, sizeof(void *) << ret->level2bits[0]); + if (ret->root == NULL) { + /* + * We leak the rtree here, since there's no generic base + * deallocation. + */ + return (NULL); + } + + return (ret); +} + +#define MALLOC_RTREE_GET_GENERATE(f) \ +/* The least significant bits of the key are ignored. */ \ +static inline void * \ +f(malloc_rtree_t *rtree, uintptr_t key) \ +{ \ + void *ret; \ + uintptr_t subkey; \ + unsigned i, lshift, height, bits; \ + void **node, **child; \ + \ + MALLOC_RTREE_LOCK(&rtree->lock); \ + for (i = lshift = 0, height = rtree->height, node = rtree->root;\ + i < height - 1; \ + i++, lshift += bits, node = child) { \ + bits = rtree->level2bits[i]; \ + subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits); \ + child = (void**)node[subkey]; \ + if (child == NULL) { \ + MALLOC_RTREE_UNLOCK(&rtree->lock); \ + return (NULL); \ + } \ + } \ + \ + /* \ + * node is a leaf, so it contains values rather than node \ + * pointers. \ + */ \ + bits = rtree->level2bits[i]; \ + subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits); \ + ret = node[subkey]; \ + MALLOC_RTREE_UNLOCK(&rtree->lock); \ + \ + MALLOC_RTREE_GET_VALIDATE \ + return (ret); \ +} + +#ifdef MALLOC_DEBUG +# define MALLOC_RTREE_LOCK(l) malloc_spin_lock(l) +# define MALLOC_RTREE_UNLOCK(l) malloc_spin_unlock(l) +# define MALLOC_RTREE_GET_VALIDATE +MALLOC_RTREE_GET_GENERATE(malloc_rtree_get_locked) +# undef MALLOC_RTREE_LOCK +# undef MALLOC_RTREE_UNLOCK +# undef MALLOC_RTREE_GET_VALIDATE +#endif + +#define MALLOC_RTREE_LOCK(l) +#define MALLOC_RTREE_UNLOCK(l) +#ifdef MALLOC_DEBUG + /* + * Suppose that it were possible for a jemalloc-allocated chunk to be + * munmap()ped, followed by a different allocator in another thread re-using + * overlapping virtual memory, all without invalidating the cached rtree + * value. The result would be a false positive (the rtree would claim that + * jemalloc owns memory that it had actually discarded). I don't think this + * scenario is possible, but the following assertion is a prudent sanity + * check. + */ +# define MALLOC_RTREE_GET_VALIDATE \ + assert(malloc_rtree_get_locked(rtree, key) == ret); +#else +# define MALLOC_RTREE_GET_VALIDATE +#endif +MALLOC_RTREE_GET_GENERATE(malloc_rtree_get) +#undef MALLOC_RTREE_LOCK +#undef MALLOC_RTREE_UNLOCK +#undef MALLOC_RTREE_GET_VALIDATE + +static inline bool +malloc_rtree_set(malloc_rtree_t *rtree, uintptr_t key, void *val) +{ + uintptr_t subkey; + unsigned i, lshift, height, bits; + void **node, **child; + + malloc_spin_lock(&rtree->lock); + for (i = lshift = 0, height = rtree->height, node = rtree->root; + i < height - 1; + i++, lshift += bits, node = child) { + bits = rtree->level2bits[i]; + subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits); + child = (void**)node[subkey]; + if (child == NULL) { + child = (void**)base_calloc(1, sizeof(void *) << + rtree->level2bits[i+1]); + if (child == NULL) { + malloc_spin_unlock(&rtree->lock); + return (true); + } + node[subkey] = child; + } + } + + /* node is a leaf, so it contains values rather than node pointers. */ + bits = rtree->level2bits[i]; + subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits); + node[subkey] = val; + malloc_spin_unlock(&rtree->lock); + + return (false); +} +#endif + +/* pages_trim, chunk_alloc_mmap_slow and chunk_alloc_mmap were cherry-picked + * from upstream jemalloc 3.4.1 to fix Mozilla bug 956501. */ + +/* Return the offset between a and the nearest aligned address at or below a. */ +#define ALIGNMENT_ADDR2OFFSET(a, alignment) \ + ((size_t)((uintptr_t)(a) & (alignment - 1))) + +/* Return the smallest alignment multiple that is >= s. */ +#define ALIGNMENT_CEILING(s, alignment) \ + (((s) + (alignment - 1)) & (-(alignment))) + +static void * +pages_trim(void *addr, size_t alloc_size, size_t leadsize, size_t size) +{ + void *ret = (void *)((uintptr_t)addr + leadsize); + + assert(alloc_size >= leadsize + size); +#ifdef MOZ_MEMORY_WINDOWS + { + void *new_addr; + + pages_unmap(addr, alloc_size); + new_addr = pages_map(ret, size); + if (new_addr == ret) + return (ret); + if (new_addr) + pages_unmap(new_addr, size); + return (NULL); + } +#else + { + size_t trailsize = alloc_size - leadsize - size; + + if (leadsize != 0) + pages_unmap(addr, leadsize); + if (trailsize != 0) + pages_unmap((void *)((uintptr_t)ret + size), trailsize); + return (ret); + } +#endif +} + +static void * +chunk_alloc_mmap_slow(size_t size, size_t alignment) +{ + void *ret, *pages; + size_t alloc_size, leadsize; + + alloc_size = size + alignment - pagesize; + /* Beware size_t wrap-around. */ + if (alloc_size < size) + return (NULL); + do { + pages = pages_map(NULL, alloc_size); + if (pages == NULL) + return (NULL); + leadsize = ALIGNMENT_CEILING((uintptr_t)pages, alignment) - + (uintptr_t)pages; + ret = pages_trim(pages, alloc_size, leadsize, size); + } while (ret == NULL); + + assert(ret != NULL); + return (ret); +} + +static void * +chunk_alloc_mmap(size_t size, size_t alignment) +{ +#ifdef JEMALLOC_USES_MAP_ALIGN + return pages_map_align(size, alignment); +#else + void *ret; + size_t offset; + + /* + * Ideally, there would be a way to specify alignment to mmap() (like + * NetBSD has), but in the absence of such a feature, we have to work + * hard to efficiently create aligned mappings. The reliable, but + * slow method is to create a mapping that is over-sized, then trim the + * excess. However, that always results in one or two calls to + * pages_unmap(). + * + * Optimistically try mapping precisely the right amount before falling + * back to the slow method, with the expectation that the optimistic + * approach works most of the time. + */ + + ret = pages_map(NULL, size); + if (ret == NULL) + return (NULL); + offset = ALIGNMENT_ADDR2OFFSET(ret, alignment); + if (offset != 0) { + pages_unmap(ret, size); + return (chunk_alloc_mmap_slow(size, alignment)); + } + + assert(ret != NULL); + return (ret); +#endif +} + +bool +pages_purge(void *addr, size_t length) +{ + bool unzeroed; + +#ifdef MALLOC_DECOMMIT + pages_decommit(addr, length); + unzeroed = false; +#else +# ifdef MOZ_MEMORY_WINDOWS + /* + * The region starting at addr may have been allocated in multiple calls + * to VirtualAlloc and recycled, so resetting the entire region in one + * go may not be valid. However, since we allocate at least a chunk at a + * time, we may touch any region in chunksized increments. + */ + size_t pages_size = min(length, chunksize - + CHUNK_ADDR2OFFSET((uintptr_t)addr)); + while (length > 0) { + VirtualAlloc(addr, pages_size, MEM_RESET, PAGE_READWRITE); + addr = (void *)((uintptr_t)addr + pages_size); + length -= pages_size; + pages_size = min(length, chunksize); + } + unzeroed = true; +# else +# ifdef MOZ_MEMORY_LINUX +# define JEMALLOC_MADV_PURGE MADV_DONTNEED +# define JEMALLOC_MADV_ZEROS true +# else /* FreeBSD and Darwin. */ +# define JEMALLOC_MADV_PURGE MADV_FREE +# define JEMALLOC_MADV_ZEROS false +# endif + int err = madvise(addr, length, JEMALLOC_MADV_PURGE); + unzeroed = (JEMALLOC_MADV_ZEROS == false || err != 0); +# undef JEMALLOC_MADV_PURGE +# undef JEMALLOC_MADV_ZEROS +# endif +#endif + return (unzeroed); +} + +static void * +chunk_recycle(extent_tree_t *chunks_szad, extent_tree_t *chunks_ad, size_t size, + size_t alignment, bool base, bool *zero) +{ + void *ret; + extent_node_t *node; + extent_node_t key; + size_t alloc_size, leadsize, trailsize; + bool zeroed; + + if (base) { + /* + * This function may need to call base_node_{,de}alloc(), but + * the current chunk allocation request is on behalf of the + * base allocator. Avoid deadlock (and if that weren't an + * issue, potential for infinite recursion) by returning NULL. + */ + return (NULL); + } + + alloc_size = size + alignment - chunksize; + /* Beware size_t wrap-around. */ + if (alloc_size < size) + return (NULL); + key.addr = NULL; + key.size = alloc_size; + malloc_mutex_lock(&chunks_mtx); + node = extent_tree_szad_nsearch(chunks_szad, &key); + if (node == NULL) { + malloc_mutex_unlock(&chunks_mtx); + return (NULL); + } + leadsize = ALIGNMENT_CEILING((uintptr_t)node->addr, alignment) - + (uintptr_t)node->addr; + assert(node->size >= leadsize + size); + trailsize = node->size - leadsize - size; + ret = (void *)((uintptr_t)node->addr + leadsize); + zeroed = node->zeroed; + if (zeroed) + *zero = true; + /* Remove node from the tree. */ + extent_tree_szad_remove(chunks_szad, node); + extent_tree_ad_remove(chunks_ad, node); + if (leadsize != 0) { + /* Insert the leading space as a smaller chunk. */ + node->size = leadsize; + extent_tree_szad_insert(chunks_szad, node); + extent_tree_ad_insert(chunks_ad, node); + node = NULL; + } + if (trailsize != 0) { + /* Insert the trailing space as a smaller chunk. */ + if (node == NULL) { + /* + * An additional node is required, but + * base_node_alloc() can cause a new base chunk to be + * allocated. Drop chunks_mtx in order to avoid + * deadlock, and if node allocation fails, deallocate + * the result before returning an error. + */ + malloc_mutex_unlock(&chunks_mtx); + node = base_node_alloc(); + if (node == NULL) { + chunk_dealloc(ret, size); + return (NULL); + } + malloc_mutex_lock(&chunks_mtx); + } + node->addr = (void *)((uintptr_t)(ret) + size); + node->size = trailsize; + node->zeroed = zeroed; + extent_tree_szad_insert(chunks_szad, node); + extent_tree_ad_insert(chunks_ad, node); + node = NULL; + } + + if (config_munmap && config_recycle) + recycled_size -= size; + + malloc_mutex_unlock(&chunks_mtx); + + if (node != NULL) + base_node_dealloc(node); +#ifdef MALLOC_DECOMMIT + pages_commit(ret, size); +#endif + if (*zero) { + if (zeroed == false) + memset(ret, 0, size); +#ifdef DEBUG + else { + size_t i; + size_t *p = (size_t *)(uintptr_t)ret; + + for (i = 0; i < size / sizeof(size_t); i++) + assert(p[i] == 0); + } +#endif + } + return (ret); +} + +#ifdef MOZ_MEMORY_WINDOWS +/* + * On Windows, calls to VirtualAlloc and VirtualFree must be matched, making it + * awkward to recycle allocations of varying sizes. Therefore we only allow + * recycling when the size equals the chunksize, unless deallocation is entirely + * disabled. + */ +#define CAN_RECYCLE(size) (size == chunksize) +#else +#define CAN_RECYCLE(size) true +#endif + +static void * +chunk_alloc(size_t size, size_t alignment, bool base, bool zero) +{ + void *ret; + + assert(size != 0); + assert((size & chunksize_mask) == 0); + assert(alignment != 0); + assert((alignment & chunksize_mask) == 0); + + if (!config_munmap || (config_recycle && CAN_RECYCLE(size))) { + ret = chunk_recycle(&chunks_szad_mmap, &chunks_ad_mmap, + size, alignment, base, &zero); + if (ret != NULL) + goto RETURN; + } + ret = chunk_alloc_mmap(size, alignment); + if (ret != NULL) { + goto RETURN; + } + + /* All strategies for allocation failed. */ + ret = NULL; +RETURN: + +#ifdef MALLOC_VALIDATE + if (ret != NULL && base == false) { + if (malloc_rtree_set(chunk_rtree, (uintptr_t)ret, ret)) { + chunk_dealloc(ret, size); + return (NULL); + } + } +#endif + + assert(CHUNK_ADDR2BASE(ret) == ret); + return (ret); +} + +static void +chunk_record(extent_tree_t *chunks_szad, extent_tree_t *chunks_ad, void *chunk, + size_t size) +{ + bool unzeroed; + extent_node_t *xnode, *node, *prev, *xprev, key; + + unzeroed = pages_purge(chunk, size); + + /* + * Allocate a node before acquiring chunks_mtx even though it might not + * be needed, because base_node_alloc() may cause a new base chunk to + * be allocated, which could cause deadlock if chunks_mtx were already + * held. + */ + xnode = base_node_alloc(); + /* Use xprev to implement conditional deferred deallocation of prev. */ + xprev = NULL; + + malloc_mutex_lock(&chunks_mtx); + key.addr = (void *)((uintptr_t)chunk + size); + node = extent_tree_ad_nsearch(chunks_ad, &key); + /* Try to coalesce forward. */ + if (node != NULL && node->addr == key.addr) { + /* + * Coalesce chunk with the following address range. This does + * not change the position within chunks_ad, so only + * remove/insert from/into chunks_szad. + */ + extent_tree_szad_remove(chunks_szad, node); + node->addr = chunk; + node->size += size; + node->zeroed = (node->zeroed && (unzeroed == false)); + extent_tree_szad_insert(chunks_szad, node); + } else { + /* Coalescing forward failed, so insert a new node. */ + if (xnode == NULL) { + /* + * base_node_alloc() failed, which is an exceedingly + * unlikely failure. Leak chunk; its pages have + * already been purged, so this is only a virtual + * memory leak. + */ + goto label_return; + } + node = xnode; + xnode = NULL; /* Prevent deallocation below. */ + node->addr = chunk; + node->size = size; + node->zeroed = (unzeroed == false); + extent_tree_ad_insert(chunks_ad, node); + extent_tree_szad_insert(chunks_szad, node); + } + + /* Try to coalesce backward. */ + prev = extent_tree_ad_prev(chunks_ad, node); + if (prev != NULL && (void *)((uintptr_t)prev->addr + prev->size) == + chunk) { + /* + * Coalesce chunk with the previous address range. This does + * not change the position within chunks_ad, so only + * remove/insert node from/into chunks_szad. + */ + extent_tree_szad_remove(chunks_szad, prev); + extent_tree_ad_remove(chunks_ad, prev); + + extent_tree_szad_remove(chunks_szad, node); + node->addr = prev->addr; + node->size += prev->size; + node->zeroed = (node->zeroed && prev->zeroed); + extent_tree_szad_insert(chunks_szad, node); + + xprev = prev; + } + + if (config_munmap && config_recycle) + recycled_size += size; + +label_return: + malloc_mutex_unlock(&chunks_mtx); + /* + * Deallocate xnode and/or xprev after unlocking chunks_mtx in order to + * avoid potential deadlock. + */ + if (xnode != NULL) + base_node_dealloc(xnode); + if (xprev != NULL) + base_node_dealloc(xprev); +} + +static bool +chunk_dalloc_mmap(void *chunk, size_t size) +{ + if (!config_munmap || (config_recycle && CAN_RECYCLE(size) && + load_acquire_z(&recycled_size) < recycle_limit)) + return true; + + pages_unmap(chunk, size); + return false; +} + +#undef CAN_RECYCLE + +static void +chunk_dealloc(void *chunk, size_t size) +{ + + assert(chunk != NULL); + assert(CHUNK_ADDR2BASE(chunk) == chunk); + assert(size != 0); + assert((size & chunksize_mask) == 0); + +#ifdef MALLOC_VALIDATE + malloc_rtree_set(chunk_rtree, (uintptr_t)chunk, NULL); +#endif + + if (chunk_dalloc_mmap(chunk, size)) + chunk_record(&chunks_szad_mmap, &chunks_ad_mmap, chunk, size); +} + +/* + * End chunk management functions. + */ +/******************************************************************************/ +/* + * Begin arena. + */ + +/* + * Choose an arena based on a per-thread value (fast-path code, calls slow-path + * code if necessary). + */ +static inline arena_t * +choose_arena(void) +{ + arena_t *ret; + + /* + * We can only use TLS if this is a PIC library, since for the static + * library version, libc's malloc is used by TLS allocation, which + * introduces a bootstrapping issue. + */ +#ifndef NO_TLS + if (isthreaded == false) { + /* Avoid the overhead of TLS for single-threaded operation. */ + return (arenas[0]); + } + +# ifdef MOZ_MEMORY_WINDOWS + ret = (arena_t*)TlsGetValue(tlsIndex); +# else + ret = arenas_map; +# endif + + if (ret == NULL) { + ret = choose_arena_hard(); + RELEASE_ASSERT(ret != NULL); + } +#else + if (isthreaded && narenas > 1) { + unsigned long ind; + + /* + * Hash _pthread_self() to one of the arenas. There is a prime + * number of arenas, so this has a reasonable chance of + * working. Even so, the hashing can be easily thwarted by + * inconvenient _pthread_self() values. Without specific + * knowledge of how _pthread_self() calculates values, we can't + * easily do much better than this. + */ + ind = (unsigned long) _pthread_self() % narenas; + + /* + * Optimistially assume that arenas[ind] has been initialized. + * At worst, we find out that some other thread has already + * done so, after acquiring the lock in preparation. Note that + * this lazy locking also has the effect of lazily forcing + * cache coherency; without the lock acquisition, there's no + * guarantee that modification of arenas[ind] by another thread + * would be seen on this CPU for an arbitrary amount of time. + * + * In general, this approach to modifying a synchronized value + * isn't a good idea, but in this case we only ever modify the + * value once, so things work out well. + */ + ret = arenas[ind]; + if (ret == NULL) { + /* + * Avoid races with another thread that may have already + * initialized arenas[ind]. + */ + malloc_spin_lock(&arenas_lock); + if (arenas[ind] == NULL) + ret = arenas_extend((unsigned)ind); + else + ret = arenas[ind]; + malloc_spin_unlock(&arenas_lock); + } + } else + ret = arenas[0]; +#endif + + RELEASE_ASSERT(ret != NULL); + return (ret); +} + +#ifndef NO_TLS +/* + * Choose an arena based on a per-thread value (slow-path code only, called + * only by choose_arena()). + */ +static arena_t * +choose_arena_hard(void) +{ + arena_t *ret; + + assert(isthreaded); + +#ifdef MALLOC_BALANCE + /* Seed the PRNG used for arena load balancing. */ + SPRN(balance, (uint32_t)(uintptr_t)(_pthread_self())); +#endif + + if (narenas > 1) { +#ifdef MALLOC_BALANCE + unsigned ind; + + ind = PRN(balance, narenas_2pow); + if ((ret = arenas[ind]) == NULL) { + malloc_spin_lock(&arenas_lock); + if ((ret = arenas[ind]) == NULL) + ret = arenas_extend(ind); + malloc_spin_unlock(&arenas_lock); + } +#else + malloc_spin_lock(&arenas_lock); + if ((ret = arenas[next_arena]) == NULL) + ret = arenas_extend(next_arena); + next_arena = (next_arena + 1) % narenas; + malloc_spin_unlock(&arenas_lock); +#endif + } else + ret = arenas[0]; + +#ifdef MOZ_MEMORY_WINDOWS + TlsSetValue(tlsIndex, ret); +#else + arenas_map = ret; +#endif + + return (ret); +} +#endif + +static inline int +arena_chunk_comp(arena_chunk_t *a, arena_chunk_t *b) +{ + uintptr_t a_chunk = (uintptr_t)a; + uintptr_t b_chunk = (uintptr_t)b; + + assert(a != NULL); + assert(b != NULL); + + return ((a_chunk > b_chunk) - (a_chunk < b_chunk)); +} + +/* Wrap red-black tree macros in functions. */ +rb_wrap(static, arena_chunk_tree_dirty_, arena_chunk_tree_t, + arena_chunk_t, link_dirty, arena_chunk_comp) + +static inline int +arena_run_comp(arena_chunk_map_t *a, arena_chunk_map_t *b) +{ + uintptr_t a_mapelm = (uintptr_t)a; + uintptr_t b_mapelm = (uintptr_t)b; + + assert(a != NULL); + assert(b != NULL); + + return ((a_mapelm > b_mapelm) - (a_mapelm < b_mapelm)); +} + +/* Wrap red-black tree macros in functions. */ +rb_wrap(static, arena_run_tree_, arena_run_tree_t, arena_chunk_map_t, link, + arena_run_comp) + +static inline int +arena_avail_comp(arena_chunk_map_t *a, arena_chunk_map_t *b) +{ + int ret; + size_t a_size = a->bits & ~pagesize_mask; + size_t b_size = b->bits & ~pagesize_mask; + + ret = (a_size > b_size) - (a_size < b_size); + if (ret == 0) { + uintptr_t a_mapelm, b_mapelm; + + if ((a->bits & CHUNK_MAP_KEY) == 0) + a_mapelm = (uintptr_t)a; + else { + /* + * Treat keys as though they are lower than anything + * else. + */ + a_mapelm = 0; + } + b_mapelm = (uintptr_t)b; + + ret = (a_mapelm > b_mapelm) - (a_mapelm < b_mapelm); + } + + return (ret); +} + +/* Wrap red-black tree macros in functions. */ +rb_wrap(static, arena_avail_tree_, arena_avail_tree_t, arena_chunk_map_t, link, + arena_avail_comp) + +static inline void * +arena_run_reg_alloc(arena_run_t *run, arena_bin_t *bin) +{ + void *ret; + unsigned i, mask, bit, regind; + + assert(run->magic == ARENA_RUN_MAGIC); + assert(run->regs_minelm < bin->regs_mask_nelms); + + /* + * Move the first check outside the loop, so that run->regs_minelm can + * be updated unconditionally, without the possibility of updating it + * multiple times. + */ + i = run->regs_minelm; + mask = run->regs_mask[i]; + if (mask != 0) { + /* Usable allocation found. */ + bit = ffs((int)mask) - 1; + + regind = ((i << (SIZEOF_INT_2POW + 3)) + bit); + assert(regind < bin->nregs); + ret = (void *)(((uintptr_t)run) + bin->reg0_offset + + (bin->reg_size * regind)); + + /* Clear bit. */ + mask ^= (1U << bit); + run->regs_mask[i] = mask; + + return (ret); + } + + for (i++; i < bin->regs_mask_nelms; i++) { + mask = run->regs_mask[i]; + if (mask != 0) { + /* Usable allocation found. */ + bit = ffs((int)mask) - 1; + + regind = ((i << (SIZEOF_INT_2POW + 3)) + bit); + assert(regind < bin->nregs); + ret = (void *)(((uintptr_t)run) + bin->reg0_offset + + (bin->reg_size * regind)); + + /* Clear bit. */ + mask ^= (1U << bit); + run->regs_mask[i] = mask; + + /* + * Make a note that nothing before this element + * contains a free region. + */ + run->regs_minelm = i; /* Low payoff: + (mask == 0); */ + + return (ret); + } + } + /* Not reached. */ + RELEASE_ASSERT(0); + return (NULL); +} + +static inline void +arena_run_reg_dalloc(arena_run_t *run, arena_bin_t *bin, void *ptr, size_t size) +{ + /* + * To divide by a number D that is not a power of two we multiply + * by (2^21 / D) and then right shift by 21 positions. + * + * X / D + * + * becomes + * + * (X * size_invs[(D >> QUANTUM_2POW_MIN) - 3]) >> SIZE_INV_SHIFT + */ +#define SIZE_INV_SHIFT 21 +#define SIZE_INV(s) (((1U << SIZE_INV_SHIFT) / (s << QUANTUM_2POW_MIN)) + 1) + static const unsigned size_invs[] = { + SIZE_INV(3), + SIZE_INV(4), SIZE_INV(5), SIZE_INV(6), SIZE_INV(7), + SIZE_INV(8), SIZE_INV(9), SIZE_INV(10), SIZE_INV(11), + SIZE_INV(12),SIZE_INV(13), SIZE_INV(14), SIZE_INV(15), + SIZE_INV(16),SIZE_INV(17), SIZE_INV(18), SIZE_INV(19), + SIZE_INV(20),SIZE_INV(21), SIZE_INV(22), SIZE_INV(23), + SIZE_INV(24),SIZE_INV(25), SIZE_INV(26), SIZE_INV(27), + SIZE_INV(28),SIZE_INV(29), SIZE_INV(30), SIZE_INV(31) +#if (QUANTUM_2POW_MIN < 4) + , + SIZE_INV(32), SIZE_INV(33), SIZE_INV(34), SIZE_INV(35), + SIZE_INV(36), SIZE_INV(37), SIZE_INV(38), SIZE_INV(39), + SIZE_INV(40), SIZE_INV(41), SIZE_INV(42), SIZE_INV(43), + SIZE_INV(44), SIZE_INV(45), SIZE_INV(46), SIZE_INV(47), + SIZE_INV(48), SIZE_INV(49), SIZE_INV(50), SIZE_INV(51), + SIZE_INV(52), SIZE_INV(53), SIZE_INV(54), SIZE_INV(55), + SIZE_INV(56), SIZE_INV(57), SIZE_INV(58), SIZE_INV(59), + SIZE_INV(60), SIZE_INV(61), SIZE_INV(62), SIZE_INV(63) +#endif + }; + unsigned diff, regind, elm, bit; + + assert(run->magic == ARENA_RUN_MAGIC); + assert(((sizeof(size_invs)) / sizeof(unsigned)) + 3 + >= (SMALL_MAX_DEFAULT >> QUANTUM_2POW_MIN)); + + /* + * Avoid doing division with a variable divisor if possible. Using + * actual division here can reduce allocator throughput by over 20%! + */ + diff = (unsigned)((uintptr_t)ptr - (uintptr_t)run - bin->reg0_offset); + if ((size & (size - 1)) == 0) { + /* + * log2_table allows fast division of a power of two in the + * [1..128] range. + * + * (x / divisor) becomes (x >> log2_table[divisor - 1]). + */ + static const unsigned char log2_table[] = { + 0, 1, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7 + }; + + if (size <= 128) + regind = (diff >> log2_table[size - 1]); + else if (size <= 32768) + regind = diff >> (8 + log2_table[(size >> 8) - 1]); + else { + /* + * The run size is too large for us to use the lookup + * table. Use real division. + */ + regind = diff / size; + } + } else if (size <= ((sizeof(size_invs) / sizeof(unsigned)) + << QUANTUM_2POW_MIN) + 2) { + regind = size_invs[(size >> QUANTUM_2POW_MIN) - 3] * diff; + regind >>= SIZE_INV_SHIFT; + } else { + /* + * size_invs isn't large enough to handle this size class, so + * calculate regind using actual division. This only happens + * if the user increases small_max via the 'S' runtime + * configuration option. + */ + regind = diff / size; + }; + RELEASE_ASSERT(diff == regind * size); + RELEASE_ASSERT(regind < bin->nregs); + + elm = regind >> (SIZEOF_INT_2POW + 3); + if (elm < run->regs_minelm) + run->regs_minelm = elm; + bit = regind - (elm << (SIZEOF_INT_2POW + 3)); + RELEASE_ASSERT((run->regs_mask[elm] & (1U << bit)) == 0); + run->regs_mask[elm] |= (1U << bit); +#undef SIZE_INV +#undef SIZE_INV_SHIFT +} + +static void +arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool large, + bool zero) +{ + arena_chunk_t *chunk; + size_t old_ndirty, run_ind, total_pages, need_pages, rem_pages, i; + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); + old_ndirty = chunk->ndirty; + run_ind = (unsigned)(((uintptr_t)run - (uintptr_t)chunk) + >> pagesize_2pow); + total_pages = (chunk->map[run_ind].bits & ~pagesize_mask) >> + pagesize_2pow; + need_pages = (size >> pagesize_2pow); + assert(need_pages > 0); + assert(need_pages <= total_pages); + rem_pages = total_pages - need_pages; + + arena_avail_tree_remove(&arena->runs_avail, &chunk->map[run_ind]); + + /* Keep track of trailing unused pages for later use. */ + if (rem_pages > 0) { + chunk->map[run_ind+need_pages].bits = (rem_pages << + pagesize_2pow) | (chunk->map[run_ind+need_pages].bits & + pagesize_mask); + chunk->map[run_ind+total_pages-1].bits = (rem_pages << + pagesize_2pow) | (chunk->map[run_ind+total_pages-1].bits & + pagesize_mask); + arena_avail_tree_insert(&arena->runs_avail, + &chunk->map[run_ind+need_pages]); + } + + for (i = 0; i < need_pages; i++) { +#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) || defined(MALLOC_DOUBLE_PURGE) + /* + * Commit decommitted pages if necessary. If a decommitted + * page is encountered, commit all needed adjacent decommitted + * pages in one operation, in order to reduce system call + * overhead. + */ + if (chunk->map[run_ind + i].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED) { + size_t j; + + /* + * Advance i+j to just past the index of the last page + * to commit. Clear CHUNK_MAP_DECOMMITTED and + * CHUNK_MAP_MADVISED along the way. + */ + for (j = 0; i + j < need_pages && (chunk->map[run_ind + + i + j].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED); j++) { + /* DECOMMITTED and MADVISED are mutually exclusive. */ + assert(!(chunk->map[run_ind + i + j].bits & CHUNK_MAP_DECOMMITTED && + chunk->map[run_ind + i + j].bits & CHUNK_MAP_MADVISED)); + + chunk->map[run_ind + i + j].bits &= + ~CHUNK_MAP_MADVISED_OR_DECOMMITTED; + } + +# ifdef MALLOC_DECOMMIT + pages_commit((void *)((uintptr_t)chunk + ((run_ind + i) + << pagesize_2pow)), (j << pagesize_2pow)); +# ifdef MALLOC_STATS + arena->stats.ncommit++; +# endif +# endif + +# ifdef MALLOC_STATS + arena->stats.committed += j; +# endif + +# ifndef MALLOC_DECOMMIT + } +# else + } else /* No need to zero since commit zeros. */ +# endif + +#endif + + /* Zero if necessary. */ + if (zero) { + if ((chunk->map[run_ind + i].bits & CHUNK_MAP_ZEROED) + == 0) { + memset((void *)((uintptr_t)chunk + ((run_ind + + i) << pagesize_2pow)), 0, pagesize); + /* CHUNK_MAP_ZEROED is cleared below. */ + } + } + + /* Update dirty page accounting. */ + if (chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY) { + chunk->ndirty--; + arena->ndirty--; + /* CHUNK_MAP_DIRTY is cleared below. */ + } + + /* Initialize the chunk map. */ + if (large) { + chunk->map[run_ind + i].bits = CHUNK_MAP_LARGE + | CHUNK_MAP_ALLOCATED; + } else { + chunk->map[run_ind + i].bits = (size_t)run + | CHUNK_MAP_ALLOCATED; + } + } + + /* + * Set the run size only in the first element for large runs. This is + * primarily a debugging aid, since the lack of size info for trailing + * pages only matters if the application tries to operate on an + * interior pointer. + */ + if (large) + chunk->map[run_ind].bits |= size; + + if (chunk->ndirty == 0 && old_ndirty > 0) + arena_chunk_tree_dirty_remove(&arena->chunks_dirty, chunk); +} + +static void +arena_chunk_init(arena_t *arena, arena_chunk_t *chunk) +{ + arena_run_t *run; + size_t i; + +#ifdef MALLOC_STATS + arena->stats.mapped += chunksize; +#endif + + chunk->arena = arena; + + /* + * Claim that no pages are in use, since the header is merely overhead. + */ + chunk->ndirty = 0; + + /* Initialize the map to contain one maximal free untouched run. */ + run = (arena_run_t *)((uintptr_t)chunk + (arena_chunk_header_npages << + pagesize_2pow)); + for (i = 0; i < arena_chunk_header_npages; i++) + chunk->map[i].bits = 0; + chunk->map[i].bits = arena_maxclass | CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED; + for (i++; i < chunk_npages-1; i++) { + chunk->map[i].bits = CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED; + } + chunk->map[chunk_npages-1].bits = arena_maxclass | CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED; + +#ifdef MALLOC_DECOMMIT + /* + * Start out decommitted, in order to force a closer correspondence + * between dirty pages and committed untouched pages. + */ + pages_decommit(run, arena_maxclass); +# ifdef MALLOC_STATS + arena->stats.ndecommit++; + arena->stats.decommitted += (chunk_npages - arena_chunk_header_npages); +# endif +#endif +#ifdef MALLOC_STATS + arena->stats.committed += arena_chunk_header_npages; +#endif + + /* Insert the run into the runs_avail tree. */ + arena_avail_tree_insert(&arena->runs_avail, + &chunk->map[arena_chunk_header_npages]); + +#ifdef MALLOC_DOUBLE_PURGE + LinkedList_Init(&chunk->chunks_madvised_elem); +#endif +} + +static void +arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk) +{ + + if (arena->spare != NULL) { + if (arena->spare->ndirty > 0) { + arena_chunk_tree_dirty_remove( + &chunk->arena->chunks_dirty, arena->spare); + arena->ndirty -= arena->spare->ndirty; +#ifdef MALLOC_STATS + arena->stats.committed -= arena->spare->ndirty; +#endif + } + +#ifdef MALLOC_DOUBLE_PURGE + /* This is safe to do even if arena->spare is not in the list. */ + LinkedList_Remove(&arena->spare->chunks_madvised_elem); +#endif + + chunk_dealloc((void *)arena->spare, chunksize); +#ifdef MALLOC_STATS + arena->stats.mapped -= chunksize; + arena->stats.committed -= arena_chunk_header_npages; +#endif + } + + /* + * Remove run from runs_avail, so that the arena does not use it. + * Dirty page flushing only uses the chunks_dirty tree, so leaving this + * chunk in the chunks_* trees is sufficient for that purpose. + */ + arena_avail_tree_remove(&arena->runs_avail, + &chunk->map[arena_chunk_header_npages]); + + arena->spare = chunk; +} + +static arena_run_t * +arena_run_alloc(arena_t *arena, arena_bin_t *bin, size_t size, bool large, + bool zero) +{ + arena_run_t *run; + arena_chunk_map_t *mapelm, key; + + assert(size <= arena_maxclass); + assert((size & pagesize_mask) == 0); + + /* Search the arena's chunks for the lowest best fit. */ + key.bits = size | CHUNK_MAP_KEY; + mapelm = arena_avail_tree_nsearch(&arena->runs_avail, &key); + if (mapelm != NULL) { + arena_chunk_t *chunk = + (arena_chunk_t*)CHUNK_ADDR2BASE(mapelm); + size_t pageind = ((uintptr_t)mapelm - + (uintptr_t)chunk->map) / + sizeof(arena_chunk_map_t); + + run = (arena_run_t *)((uintptr_t)chunk + (pageind + << pagesize_2pow)); + arena_run_split(arena, run, size, large, zero); + return (run); + } + + if (arena->spare != NULL) { + /* Use the spare. */ + arena_chunk_t *chunk = arena->spare; + arena->spare = NULL; + run = (arena_run_t *)((uintptr_t)chunk + + (arena_chunk_header_npages << pagesize_2pow)); + /* Insert the run into the runs_avail tree. */ + arena_avail_tree_insert(&arena->runs_avail, + &chunk->map[arena_chunk_header_npages]); + arena_run_split(arena, run, size, large, zero); + return (run); + } + + /* + * No usable runs. Create a new chunk from which to allocate + * the run. + */ + { + arena_chunk_t *chunk = (arena_chunk_t *) + chunk_alloc(chunksize, chunksize, false, true); + if (chunk == NULL) + return (NULL); + + arena_chunk_init(arena, chunk); + run = (arena_run_t *)((uintptr_t)chunk + + (arena_chunk_header_npages << pagesize_2pow)); + } + /* Update page map. */ + arena_run_split(arena, run, size, large, zero); + return (run); +} + +static void +arena_purge(arena_t *arena, bool all) +{ + arena_chunk_t *chunk; + size_t i, npages; + /* If all is set purge all dirty pages. */ + size_t dirty_max = all ? 1 : opt_dirty_max; +#ifdef MALLOC_DEBUG + size_t ndirty = 0; + rb_foreach_begin(arena_chunk_t, link_dirty, &arena->chunks_dirty, + chunk) { + ndirty += chunk->ndirty; + } rb_foreach_end(arena_chunk_t, link_dirty, &arena->chunks_dirty, chunk) + assert(ndirty == arena->ndirty); +#endif + RELEASE_ASSERT(all || (arena->ndirty > opt_dirty_max)); + +#ifdef MALLOC_STATS + arena->stats.npurge++; +#endif + + /* + * Iterate downward through chunks until enough dirty memory has been + * purged. Terminate as soon as possible in order to minimize the + * number of system calls, even if a chunk has only been partially + * purged. + */ + while (arena->ndirty > (dirty_max >> 1)) { +#ifdef MALLOC_DOUBLE_PURGE + bool madvised = false; +#endif + chunk = arena_chunk_tree_dirty_last(&arena->chunks_dirty); + RELEASE_ASSERT(chunk != NULL); + + for (i = chunk_npages - 1; chunk->ndirty > 0; i--) { + RELEASE_ASSERT(i >= arena_chunk_header_npages); + + if (chunk->map[i].bits & CHUNK_MAP_DIRTY) { +#ifdef MALLOC_DECOMMIT + const size_t free_operation = CHUNK_MAP_DECOMMITTED; +#else + const size_t free_operation = CHUNK_MAP_MADVISED; +#endif + assert((chunk->map[i].bits & + CHUNK_MAP_MADVISED_OR_DECOMMITTED) == 0); + chunk->map[i].bits ^= free_operation | CHUNK_MAP_DIRTY; + /* Find adjacent dirty run(s). */ + for (npages = 1; + i > arena_chunk_header_npages && + (chunk->map[i - 1].bits & CHUNK_MAP_DIRTY); + npages++) { + i--; + assert((chunk->map[i].bits & + CHUNK_MAP_MADVISED_OR_DECOMMITTED) == 0); + chunk->map[i].bits ^= free_operation | CHUNK_MAP_DIRTY; + } + chunk->ndirty -= npages; + arena->ndirty -= npages; + +#ifdef MALLOC_DECOMMIT + pages_decommit((void *)((uintptr_t) + chunk + (i << pagesize_2pow)), + (npages << pagesize_2pow)); +# ifdef MALLOC_STATS + arena->stats.ndecommit++; + arena->stats.decommitted += npages; +# endif +#endif +#ifdef MALLOC_STATS + arena->stats.committed -= npages; +#endif + +#ifndef MALLOC_DECOMMIT + madvise((void *)((uintptr_t)chunk + (i << + pagesize_2pow)), (npages << pagesize_2pow), + MADV_FREE); +# ifdef MALLOC_DOUBLE_PURGE + madvised = true; +# endif +#endif +#ifdef MALLOC_STATS + arena->stats.nmadvise++; + arena->stats.purged += npages; +#endif + if (arena->ndirty <= (dirty_max >> 1)) + break; + } + } + + if (chunk->ndirty == 0) { + arena_chunk_tree_dirty_remove(&arena->chunks_dirty, + chunk); + } +#ifdef MALLOC_DOUBLE_PURGE + if (madvised) { + /* The chunk might already be in the list, but this + * makes sure it's at the front. */ + LinkedList_Remove(&chunk->chunks_madvised_elem); + LinkedList_InsertHead(&arena->chunks_madvised, &chunk->chunks_madvised_elem); + } +#endif + } +} + +static void +arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty) +{ + arena_chunk_t *chunk; + size_t size, run_ind, run_pages; + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); + run_ind = (size_t)(((uintptr_t)run - (uintptr_t)chunk) + >> pagesize_2pow); + RELEASE_ASSERT(run_ind >= arena_chunk_header_npages); + RELEASE_ASSERT(run_ind < chunk_npages); + if ((chunk->map[run_ind].bits & CHUNK_MAP_LARGE) != 0) + size = chunk->map[run_ind].bits & ~pagesize_mask; + else + size = run->bin->run_size; + run_pages = (size >> pagesize_2pow); + + /* Mark pages as unallocated in the chunk map. */ + if (dirty) { + size_t i; + + for (i = 0; i < run_pages; i++) { + RELEASE_ASSERT((chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY) + == 0); + chunk->map[run_ind + i].bits = CHUNK_MAP_DIRTY; + } + + if (chunk->ndirty == 0) { + arena_chunk_tree_dirty_insert(&arena->chunks_dirty, + chunk); + } + chunk->ndirty += run_pages; + arena->ndirty += run_pages; + } else { + size_t i; + + for (i = 0; i < run_pages; i++) { + chunk->map[run_ind + i].bits &= ~(CHUNK_MAP_LARGE | + CHUNK_MAP_ALLOCATED); + } + } + chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits & + pagesize_mask); + chunk->map[run_ind+run_pages-1].bits = size | + (chunk->map[run_ind+run_pages-1].bits & pagesize_mask); + + /* Try to coalesce forward. */ + if (run_ind + run_pages < chunk_npages && + (chunk->map[run_ind+run_pages].bits & CHUNK_MAP_ALLOCATED) == 0) { + size_t nrun_size = chunk->map[run_ind+run_pages].bits & + ~pagesize_mask; + + /* + * Remove successor from runs_avail; the coalesced run is + * inserted later. + */ + arena_avail_tree_remove(&arena->runs_avail, + &chunk->map[run_ind+run_pages]); + + size += nrun_size; + run_pages = size >> pagesize_2pow; + + RELEASE_ASSERT((chunk->map[run_ind+run_pages-1].bits & ~pagesize_mask) + == nrun_size); + chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits & + pagesize_mask); + chunk->map[run_ind+run_pages-1].bits = size | + (chunk->map[run_ind+run_pages-1].bits & pagesize_mask); + } + + /* Try to coalesce backward. */ + if (run_ind > arena_chunk_header_npages && (chunk->map[run_ind-1].bits & + CHUNK_MAP_ALLOCATED) == 0) { + size_t prun_size = chunk->map[run_ind-1].bits & ~pagesize_mask; + + run_ind -= prun_size >> pagesize_2pow; + + /* + * Remove predecessor from runs_avail; the coalesced run is + * inserted later. + */ + arena_avail_tree_remove(&arena->runs_avail, + &chunk->map[run_ind]); + + size += prun_size; + run_pages = size >> pagesize_2pow; + + RELEASE_ASSERT((chunk->map[run_ind].bits & ~pagesize_mask) == + prun_size); + chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits & + pagesize_mask); + chunk->map[run_ind+run_pages-1].bits = size | + (chunk->map[run_ind+run_pages-1].bits & pagesize_mask); + } + + /* Insert into runs_avail, now that coalescing is complete. */ + arena_avail_tree_insert(&arena->runs_avail, &chunk->map[run_ind]); + + /* Deallocate chunk if it is now completely unused. */ + if ((chunk->map[arena_chunk_header_npages].bits & (~pagesize_mask | + CHUNK_MAP_ALLOCATED)) == arena_maxclass) + arena_chunk_dealloc(arena, chunk); + + /* Enforce opt_dirty_max. */ + if (arena->ndirty > opt_dirty_max) + arena_purge(arena, false); +} + +static void +arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, + size_t oldsize, size_t newsize) +{ + size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> pagesize_2pow; + size_t head_npages = (oldsize - newsize) >> pagesize_2pow; + + assert(oldsize > newsize); + + /* + * Update the chunk map so that arena_run_dalloc() can treat the + * leading run as separately allocated. + */ + chunk->map[pageind].bits = (oldsize - newsize) | CHUNK_MAP_LARGE | + CHUNK_MAP_ALLOCATED; + chunk->map[pageind+head_npages].bits = newsize | CHUNK_MAP_LARGE | + CHUNK_MAP_ALLOCATED; + + arena_run_dalloc(arena, run, false); +} + +static void +arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, + size_t oldsize, size_t newsize, bool dirty) +{ + size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> pagesize_2pow; + size_t npages = newsize >> pagesize_2pow; + + assert(oldsize > newsize); + + /* + * Update the chunk map so that arena_run_dalloc() can treat the + * trailing run as separately allocated. + */ + chunk->map[pageind].bits = newsize | CHUNK_MAP_LARGE | + CHUNK_MAP_ALLOCATED; + chunk->map[pageind+npages].bits = (oldsize - newsize) | CHUNK_MAP_LARGE + | CHUNK_MAP_ALLOCATED; + + arena_run_dalloc(arena, (arena_run_t *)((uintptr_t)run + newsize), + dirty); +} + +static arena_run_t * +arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin) +{ + arena_chunk_map_t *mapelm; + arena_run_t *run; + unsigned i, remainder; + + /* Look for a usable run. */ + mapelm = arena_run_tree_first(&bin->runs); + if (mapelm != NULL) { + /* run is guaranteed to have available space. */ + arena_run_tree_remove(&bin->runs, mapelm); + run = (arena_run_t *)(mapelm->bits & ~pagesize_mask); +#ifdef MALLOC_STATS + bin->stats.reruns++; +#endif + return (run); + } + /* No existing runs have any space available. */ + + /* Allocate a new run. */ + run = arena_run_alloc(arena, bin, bin->run_size, false, false); + if (run == NULL) + return (NULL); + /* + * Don't initialize if a race in arena_run_alloc() allowed an existing + * run to become usable. + */ + if (run == bin->runcur) + return (run); + + /* Initialize run internals. */ + run->bin = bin; + + for (i = 0; i < bin->regs_mask_nelms - 1; i++) + run->regs_mask[i] = UINT_MAX; + remainder = bin->nregs & ((1U << (SIZEOF_INT_2POW + 3)) - 1); + if (remainder == 0) + run->regs_mask[i] = UINT_MAX; + else { + /* The last element has spare bits that need to be unset. */ + run->regs_mask[i] = (UINT_MAX >> ((1U << (SIZEOF_INT_2POW + 3)) + - remainder)); + } + + run->regs_minelm = 0; + + run->nfree = bin->nregs; +#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS) + run->magic = ARENA_RUN_MAGIC; +#endif + +#ifdef MALLOC_STATS + bin->stats.nruns++; + bin->stats.curruns++; + if (bin->stats.curruns > bin->stats.highruns) + bin->stats.highruns = bin->stats.curruns; +#endif + return (run); +} + +/* bin->runcur must have space available before this function is called. */ +static inline void * +arena_bin_malloc_easy(arena_t *arena, arena_bin_t *bin, arena_run_t *run) +{ + void *ret; + + RELEASE_ASSERT(run->magic == ARENA_RUN_MAGIC); + RELEASE_ASSERT(run->nfree > 0); + + ret = arena_run_reg_alloc(run, bin); + RELEASE_ASSERT(ret != NULL); + run->nfree--; + + return (ret); +} + +/* Re-fill bin->runcur, then call arena_bin_malloc_easy(). */ +static void * +arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin) +{ + + bin->runcur = arena_bin_nonfull_run_get(arena, bin); + if (bin->runcur == NULL) + return (NULL); + RELEASE_ASSERT(bin->runcur->magic == ARENA_RUN_MAGIC); + RELEASE_ASSERT(bin->runcur->nfree > 0); + + return (arena_bin_malloc_easy(arena, bin, bin->runcur)); +} + +/* + * Calculate bin->run_size such that it meets the following constraints: + * + * *) bin->run_size >= min_run_size + * *) bin->run_size <= arena_maxclass + * *) bin->run_size <= RUN_MAX_SMALL + * *) run header overhead <= RUN_MAX_OVRHD (or header overhead relaxed). + * + * bin->nregs, bin->regs_mask_nelms, and bin->reg0_offset are + * also calculated here, since these settings are all interdependent. + */ +static size_t +arena_bin_run_size_calc(arena_bin_t *bin, size_t min_run_size) +{ + size_t try_run_size, good_run_size; + unsigned good_nregs, good_mask_nelms, good_reg0_offset; + unsigned try_nregs, try_mask_nelms, try_reg0_offset; + + assert(min_run_size >= pagesize); + assert(min_run_size <= arena_maxclass); + + /* + * Calculate known-valid settings before entering the run_size + * expansion loop, so that the first part of the loop always copies + * valid settings. + * + * The do..while loop iteratively reduces the number of regions until + * the run header and the regions no longer overlap. A closed formula + * would be quite messy, since there is an interdependency between the + * header's mask length and the number of regions. + */ + try_run_size = min_run_size; + try_nregs = ((try_run_size - sizeof(arena_run_t)) / bin->reg_size) + + 1; /* Counter-act try_nregs-- in loop. */ + do { + try_nregs--; + try_mask_nelms = (try_nregs >> (SIZEOF_INT_2POW + 3)) + + ((try_nregs & ((1U << (SIZEOF_INT_2POW + 3)) - 1)) ? 1 : 0); + try_reg0_offset = try_run_size - (try_nregs * bin->reg_size); + } while (sizeof(arena_run_t) + (sizeof(unsigned) * (try_mask_nelms - 1)) + > try_reg0_offset); + + /* run_size expansion loop. */ + do { + /* + * Copy valid settings before trying more aggressive settings. + */ + good_run_size = try_run_size; + good_nregs = try_nregs; + good_mask_nelms = try_mask_nelms; + good_reg0_offset = try_reg0_offset; + + /* Try more aggressive settings. */ + try_run_size += pagesize; + try_nregs = ((try_run_size - sizeof(arena_run_t)) / + bin->reg_size) + 1; /* Counter-act try_nregs-- in loop. */ + do { + try_nregs--; + try_mask_nelms = (try_nregs >> (SIZEOF_INT_2POW + 3)) + + ((try_nregs & ((1U << (SIZEOF_INT_2POW + 3)) - 1)) ? + 1 : 0); + try_reg0_offset = try_run_size - (try_nregs * + bin->reg_size); + } while (sizeof(arena_run_t) + (sizeof(unsigned) * + (try_mask_nelms - 1)) > try_reg0_offset); + } while (try_run_size <= arena_maxclass + && RUN_MAX_OVRHD * (bin->reg_size << 3) > RUN_MAX_OVRHD_RELAX + && (try_reg0_offset << RUN_BFP) > RUN_MAX_OVRHD * try_run_size); + + assert(sizeof(arena_run_t) + (sizeof(unsigned) * (good_mask_nelms - 1)) + <= good_reg0_offset); + assert((good_mask_nelms << (SIZEOF_INT_2POW + 3)) >= good_nregs); + + /* Copy final settings. */ + bin->run_size = good_run_size; + bin->nregs = good_nregs; + bin->regs_mask_nelms = good_mask_nelms; + bin->reg0_offset = good_reg0_offset; + + return (good_run_size); +} + +#ifdef MALLOC_BALANCE +static inline void +arena_lock_balance(arena_t *arena) +{ + unsigned contention; + + contention = malloc_spin_lock(&arena->lock); + if (narenas > 1) { + /* + * Calculate the exponentially averaged contention for this + * arena. Due to integer math always rounding down, this value + * decays somewhat faster then normal. + */ + arena->contention = (((uint64_t)arena->contention + * (uint64_t)((1U << BALANCE_ALPHA_INV_2POW)-1)) + + (uint64_t)contention) >> BALANCE_ALPHA_INV_2POW; + if (arena->contention >= opt_balance_threshold) + arena_lock_balance_hard(arena); + } +} + +static void +arena_lock_balance_hard(arena_t *arena) +{ + uint32_t ind; + + arena->contention = 0; +#ifdef MALLOC_STATS + arena->stats.nbalance++; +#endif + ind = PRN(balance, narenas_2pow); + if (arenas[ind] != NULL) { +#ifdef MOZ_MEMORY_WINDOWS + TlsSetValue(tlsIndex, arenas[ind]); +#else + arenas_map = arenas[ind]; +#endif + } else { + malloc_spin_lock(&arenas_lock); + if (arenas[ind] != NULL) { +#ifdef MOZ_MEMORY_WINDOWS + TlsSetValue(tlsIndex, arenas[ind]); +#else + arenas_map = arenas[ind]; +#endif + } else { +#ifdef MOZ_MEMORY_WINDOWS + TlsSetValue(tlsIndex, arenas_extend(ind)); +#else + arenas_map = arenas_extend(ind); +#endif + } + malloc_spin_unlock(&arenas_lock); + } +} +#endif + +static inline void * +arena_malloc_small(arena_t *arena, size_t size, bool zero) +{ + void *ret; + arena_bin_t *bin; + arena_run_t *run; + + if (size < small_min) { + /* Tiny. */ + size = pow2_ceil(size); + bin = &arena->bins[ffs((int)(size >> (TINY_MIN_2POW + + 1)))]; +#if (!defined(NDEBUG) || defined(MALLOC_STATS)) + /* + * Bin calculation is always correct, but we may need + * to fix size for the purposes of assertions and/or + * stats accuracy. + */ + if (size < (1U << TINY_MIN_2POW)) + size = (1U << TINY_MIN_2POW); +#endif + } else if (size <= small_max) { + /* Quantum-spaced. */ + size = QUANTUM_CEILING(size); + bin = &arena->bins[ntbins + (size >> opt_quantum_2pow) + - 1]; + } else { + /* Sub-page. */ + size = pow2_ceil(size); + bin = &arena->bins[ntbins + nqbins + + (ffs((int)(size >> opt_small_max_2pow)) - 2)]; + } + RELEASE_ASSERT(size == bin->reg_size); + +#ifdef MALLOC_BALANCE + arena_lock_balance(arena); +#else + malloc_spin_lock(&arena->lock); +#endif + if ((run = bin->runcur) != NULL && run->nfree > 0) + ret = arena_bin_malloc_easy(arena, bin, run); + else + ret = arena_bin_malloc_hard(arena, bin); + + if (ret == NULL) { + malloc_spin_unlock(&arena->lock); + return (NULL); + } + +#ifdef MALLOC_STATS + bin->stats.nrequests++; + arena->stats.nmalloc_small++; + arena->stats.allocated_small += size; +#endif + malloc_spin_unlock(&arena->lock); + + if (zero == false) { +#ifdef MALLOC_FILL + if (opt_junk) + memset(ret, 0xe4, size); + else if (opt_zero) + memset(ret, 0, size); +#endif + } else + memset(ret, 0, size); + + return (ret); +} + +static void * +arena_malloc_large(arena_t *arena, size_t size, bool zero) +{ + void *ret; + + /* Large allocation. */ + size = PAGE_CEILING(size); +#ifdef MALLOC_BALANCE + arena_lock_balance(arena); +#else + malloc_spin_lock(&arena->lock); +#endif + ret = (void *)arena_run_alloc(arena, NULL, size, true, zero); + if (ret == NULL) { + malloc_spin_unlock(&arena->lock); + return (NULL); + } +#ifdef MALLOC_STATS + arena->stats.nmalloc_large++; + arena->stats.allocated_large += size; +#endif + malloc_spin_unlock(&arena->lock); + + if (zero == false) { +#ifdef MALLOC_FILL + if (opt_junk) + memset(ret, 0xe4, size); + else if (opt_zero) + memset(ret, 0, size); +#endif + } + + return (ret); +} + +static inline void * +arena_malloc(arena_t *arena, size_t size, bool zero) +{ + + assert(arena != NULL); + RELEASE_ASSERT(arena->magic == ARENA_MAGIC); + assert(size != 0); + assert(QUANTUM_CEILING(size) <= arena_maxclass); + + if (size <= bin_maxclass) { + return (arena_malloc_small(arena, size, zero)); + } else + return (arena_malloc_large(arena, size, zero)); +} + +static inline void * +imalloc(size_t size) +{ + + assert(size != 0); + + if (size <= arena_maxclass) + return (arena_malloc(choose_arena(), size, false)); + else + return (huge_malloc(size, false)); +} + +static inline void * +icalloc(size_t size) +{ + + if (size <= arena_maxclass) + return (arena_malloc(choose_arena(), size, true)); + else + return (huge_malloc(size, true)); +} + +/* Only handles large allocations that require more than page alignment. */ +static void * +arena_palloc(arena_t *arena, size_t alignment, size_t size, size_t alloc_size) +{ + void *ret; + size_t offset; + arena_chunk_t *chunk; + + assert((size & pagesize_mask) == 0); + assert((alignment & pagesize_mask) == 0); + +#ifdef MALLOC_BALANCE + arena_lock_balance(arena); +#else + malloc_spin_lock(&arena->lock); +#endif + ret = (void *)arena_run_alloc(arena, NULL, alloc_size, true, false); + if (ret == NULL) { + malloc_spin_unlock(&arena->lock); + return (NULL); + } + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ret); + + offset = (uintptr_t)ret & (alignment - 1); + assert((offset & pagesize_mask) == 0); + assert(offset < alloc_size); + if (offset == 0) + arena_run_trim_tail(arena, chunk, (arena_run_t*)ret, alloc_size, size, false); + else { + size_t leadsize, trailsize; + + leadsize = alignment - offset; + if (leadsize > 0) { + arena_run_trim_head(arena, chunk, (arena_run_t*)ret, alloc_size, + alloc_size - leadsize); + ret = (void *)((uintptr_t)ret + leadsize); + } + + trailsize = alloc_size - leadsize - size; + if (trailsize != 0) { + /* Trim trailing space. */ + assert(trailsize < alloc_size); + arena_run_trim_tail(arena, chunk, (arena_run_t*)ret, size + trailsize, + size, false); + } + } + +#ifdef MALLOC_STATS + arena->stats.nmalloc_large++; + arena->stats.allocated_large += size; +#endif + malloc_spin_unlock(&arena->lock); + +#ifdef MALLOC_FILL + if (opt_junk) + memset(ret, 0xe4, size); + else if (opt_zero) + memset(ret, 0, size); +#endif + return (ret); +} + +static inline void * +ipalloc(size_t alignment, size_t size) +{ + void *ret; + size_t ceil_size; + + /* + * Round size up to the nearest multiple of alignment. + * + * This done, we can take advantage of the fact that for each small + * size class, every object is aligned at the smallest power of two + * that is non-zero in the base two representation of the size. For + * example: + * + * Size | Base 2 | Minimum alignment + * -----+----------+------------------ + * 96 | 1100000 | 32 + * 144 | 10100000 | 32 + * 192 | 11000000 | 64 + * + * Depending on runtime settings, it is possible that arena_malloc() + * will further round up to a power of two, but that never causes + * correctness issues. + */ + ceil_size = (size + (alignment - 1)) & (-alignment); + /* + * (ceil_size < size) protects against the combination of maximal + * alignment and size greater than maximal alignment. + */ + if (ceil_size < size) { + /* size_t overflow. */ + return (NULL); + } + + if (ceil_size <= pagesize || (alignment <= pagesize + && ceil_size <= arena_maxclass)) + ret = arena_malloc(choose_arena(), ceil_size, false); + else { + size_t run_size; + + /* + * We can't achieve sub-page alignment, so round up alignment + * permanently; it makes later calculations simpler. + */ + alignment = PAGE_CEILING(alignment); + ceil_size = PAGE_CEILING(size); + /* + * (ceil_size < size) protects against very large sizes within + * pagesize of SIZE_T_MAX. + * + * (ceil_size + alignment < ceil_size) protects against the + * combination of maximal alignment and ceil_size large enough + * to cause overflow. This is similar to the first overflow + * check above, but it needs to be repeated due to the new + * ceil_size value, which may now be *equal* to maximal + * alignment, whereas before we only detected overflow if the + * original size was *greater* than maximal alignment. + */ + if (ceil_size < size || ceil_size + alignment < ceil_size) { + /* size_t overflow. */ + return (NULL); + } + + /* + * Calculate the size of the over-size run that arena_palloc() + * would need to allocate in order to guarantee the alignment. + */ + if (ceil_size >= alignment) + run_size = ceil_size + alignment - pagesize; + else { + /* + * It is possible that (alignment << 1) will cause + * overflow, but it doesn't matter because we also + * subtract pagesize, which in the case of overflow + * leaves us with a very large run_size. That causes + * the first conditional below to fail, which means + * that the bogus run_size value never gets used for + * anything important. + */ + run_size = (alignment << 1) - pagesize; + } + + if (run_size <= arena_maxclass) { + ret = arena_palloc(choose_arena(), alignment, ceil_size, + run_size); + } else if (alignment <= chunksize) + ret = huge_malloc(ceil_size, false); + else + ret = huge_palloc(ceil_size, alignment, false); + } + + assert(((uintptr_t)ret & (alignment - 1)) == 0); + return (ret); +} + +/* Return the size of the allocation pointed to by ptr. */ +static size_t +arena_salloc(const void *ptr) +{ + size_t ret; + arena_chunk_t *chunk; + size_t pageind, mapbits; + + assert(ptr != NULL); + assert(CHUNK_ADDR2BASE(ptr) != ptr); + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); + pageind = (((uintptr_t)ptr - (uintptr_t)chunk) >> pagesize_2pow); + mapbits = chunk->map[pageind].bits; + RELEASE_ASSERT((mapbits & CHUNK_MAP_ALLOCATED) != 0); + if ((mapbits & CHUNK_MAP_LARGE) == 0) { + arena_run_t *run = (arena_run_t *)(mapbits & ~pagesize_mask); + RELEASE_ASSERT(run->magic == ARENA_RUN_MAGIC); + ret = run->bin->reg_size; + } else { + ret = mapbits & ~pagesize_mask; + RELEASE_ASSERT(ret != 0); + } + + return (ret); +} + +#if (defined(MALLOC_VALIDATE) || defined(MOZ_MEMORY_DARWIN)) +/* + * Validate ptr before assuming that it points to an allocation. Currently, + * the following validation is performed: + * + * + Check that ptr is not NULL. + * + * + Check that ptr lies within a mapped chunk. + */ +static inline size_t +isalloc_validate(const void *ptr) +{ + arena_chunk_t *chunk; + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); + if (chunk == NULL) + return (0); + + if (malloc_rtree_get(chunk_rtree, (uintptr_t)chunk) == NULL) + return (0); + + if (chunk != ptr) { + RELEASE_ASSERT(chunk->arena->magic == ARENA_MAGIC); + return (arena_salloc(ptr)); + } else { + size_t ret; + extent_node_t *node; + extent_node_t key; + + /* Chunk. */ + key.addr = (void *)chunk; + malloc_mutex_lock(&huge_mtx); + node = extent_tree_ad_search(&huge, &key); + if (node != NULL) + ret = node->size; + else + ret = 0; + malloc_mutex_unlock(&huge_mtx); + return (ret); + } +} +#endif + +static inline size_t +isalloc(const void *ptr) +{ + size_t ret; + arena_chunk_t *chunk; + + assert(ptr != NULL); + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); + if (chunk != ptr) { + /* Region. */ + assert(chunk->arena->magic == ARENA_MAGIC); + + ret = arena_salloc(ptr); + } else { + extent_node_t *node, key; + + /* Chunk (huge allocation). */ + + malloc_mutex_lock(&huge_mtx); + + /* Extract from tree of huge allocations. */ + key.addr = __DECONST(void *, ptr); + node = extent_tree_ad_search(&huge, &key); + RELEASE_ASSERT(node != NULL); + + ret = node->size; + + malloc_mutex_unlock(&huge_mtx); + } + + return (ret); +} + +static inline void +arena_dalloc_small(arena_t *arena, arena_chunk_t *chunk, void *ptr, + arena_chunk_map_t *mapelm) +{ + arena_run_t *run; + arena_bin_t *bin; + size_t size; + + run = (arena_run_t *)(mapelm->bits & ~pagesize_mask); + RELEASE_ASSERT(run->magic == ARENA_RUN_MAGIC); + bin = run->bin; + size = bin->reg_size; + +#ifdef MALLOC_FILL + if (opt_poison) + memset(ptr, 0xe5, size); +#endif + + arena_run_reg_dalloc(run, bin, ptr, size); + run->nfree++; + + if (run->nfree == bin->nregs) { + /* Deallocate run. */ + if (run == bin->runcur) + bin->runcur = NULL; + else if (bin->nregs != 1) { + size_t run_pageind = (((uintptr_t)run - + (uintptr_t)chunk)) >> pagesize_2pow; + arena_chunk_map_t *run_mapelm = + &chunk->map[run_pageind]; + /* + * This block's conditional is necessary because if the + * run only contains one region, then it never gets + * inserted into the non-full runs tree. + */ + RELEASE_ASSERT(arena_run_tree_search(&bin->runs, run_mapelm) == + run_mapelm); + arena_run_tree_remove(&bin->runs, run_mapelm); + } +#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS) + run->magic = 0; +#endif + arena_run_dalloc(arena, run, true); +#ifdef MALLOC_STATS + bin->stats.curruns--; +#endif + } else if (run->nfree == 1 && run != bin->runcur) { + /* + * Make sure that bin->runcur always refers to the lowest + * non-full run, if one exists. + */ + if (bin->runcur == NULL) + bin->runcur = run; + else if ((uintptr_t)run < (uintptr_t)bin->runcur) { + /* Switch runcur. */ + if (bin->runcur->nfree > 0) { + arena_chunk_t *runcur_chunk = + (arena_chunk_t*)CHUNK_ADDR2BASE(bin->runcur); + size_t runcur_pageind = + (((uintptr_t)bin->runcur - + (uintptr_t)runcur_chunk)) >> pagesize_2pow; + arena_chunk_map_t *runcur_mapelm = + &runcur_chunk->map[runcur_pageind]; + + /* Insert runcur. */ + RELEASE_ASSERT(arena_run_tree_search(&bin->runs, + runcur_mapelm) == NULL); + arena_run_tree_insert(&bin->runs, + runcur_mapelm); + } + bin->runcur = run; + } else { + size_t run_pageind = (((uintptr_t)run - + (uintptr_t)chunk)) >> pagesize_2pow; + arena_chunk_map_t *run_mapelm = + &chunk->map[run_pageind]; + + RELEASE_ASSERT(arena_run_tree_search(&bin->runs, run_mapelm) == + NULL); + arena_run_tree_insert(&bin->runs, run_mapelm); + } + } +#ifdef MALLOC_STATS + arena->stats.allocated_small -= size; + arena->stats.ndalloc_small++; +#endif +} + +static void +arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk, void *ptr) +{ + /* Large allocation. */ + malloc_spin_lock(&arena->lock); + +#ifdef MALLOC_FILL +#ifndef MALLOC_STATS + if (opt_poison) +#endif +#endif + { + size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> + pagesize_2pow; + size_t size = chunk->map[pageind].bits & ~pagesize_mask; + +#ifdef MALLOC_FILL +#ifdef MALLOC_STATS + if (opt_poison) +#endif + memset(ptr, 0xe5, size); +#endif +#ifdef MALLOC_STATS + arena->stats.allocated_large -= size; +#endif + } +#ifdef MALLOC_STATS + arena->stats.ndalloc_large++; +#endif + + arena_run_dalloc(arena, (arena_run_t *)ptr, true); + malloc_spin_unlock(&arena->lock); +} + +static inline void +arena_dalloc(void *ptr, size_t offset) +{ + arena_chunk_t *chunk; + arena_t *arena; + size_t pageind; + arena_chunk_map_t *mapelm; + + assert(ptr != NULL); + assert(offset != 0); + assert(CHUNK_ADDR2OFFSET(ptr) == offset); + + chunk = (arena_chunk_t *) ((uintptr_t)ptr - offset); + arena = chunk->arena; + assert(arena != NULL); + RELEASE_ASSERT(arena->magic == ARENA_MAGIC); + + pageind = offset >> pagesize_2pow; + mapelm = &chunk->map[pageind]; + RELEASE_ASSERT((mapelm->bits & CHUNK_MAP_ALLOCATED) != 0); + if ((mapelm->bits & CHUNK_MAP_LARGE) == 0) { + /* Small allocation. */ + malloc_spin_lock(&arena->lock); + arena_dalloc_small(arena, chunk, ptr, mapelm); + malloc_spin_unlock(&arena->lock); + } else + arena_dalloc_large(arena, chunk, ptr); +} + +static inline void +idalloc(void *ptr) +{ + size_t offset; + + assert(ptr != NULL); + + offset = CHUNK_ADDR2OFFSET(ptr); + if (offset != 0) + arena_dalloc(ptr, offset); + else + huge_dalloc(ptr); +} + +static void +arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk, void *ptr, + size_t size, size_t oldsize) +{ + + assert(size < oldsize); + + /* + * Shrink the run, and make trailing pages available for other + * allocations. + */ +#ifdef MALLOC_BALANCE + arena_lock_balance(arena); +#else + malloc_spin_lock(&arena->lock); +#endif + arena_run_trim_tail(arena, chunk, (arena_run_t *)ptr, oldsize, size, + true); +#ifdef MALLOC_STATS + arena->stats.allocated_large -= oldsize - size; +#endif + malloc_spin_unlock(&arena->lock); +} + +static bool +arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr, + size_t size, size_t oldsize) +{ + size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> pagesize_2pow; + size_t npages = oldsize >> pagesize_2pow; + + RELEASE_ASSERT(oldsize == (chunk->map[pageind].bits & ~pagesize_mask)); + + /* Try to extend the run. */ + assert(size > oldsize); +#ifdef MALLOC_BALANCE + arena_lock_balance(arena); +#else + malloc_spin_lock(&arena->lock); +#endif + if (pageind + npages < chunk_npages && (chunk->map[pageind+npages].bits + & CHUNK_MAP_ALLOCATED) == 0 && (chunk->map[pageind+npages].bits & + ~pagesize_mask) >= size - oldsize) { + /* + * The next run is available and sufficiently large. Split the + * following run, then merge the first part with the existing + * allocation. + */ + arena_run_split(arena, (arena_run_t *)((uintptr_t)chunk + + ((pageind+npages) << pagesize_2pow)), size - oldsize, true, + false); + + chunk->map[pageind].bits = size | CHUNK_MAP_LARGE | + CHUNK_MAP_ALLOCATED; + chunk->map[pageind+npages].bits = CHUNK_MAP_LARGE | + CHUNK_MAP_ALLOCATED; + +#ifdef MALLOC_STATS + arena->stats.allocated_large += size - oldsize; +#endif + malloc_spin_unlock(&arena->lock); + return (false); + } + malloc_spin_unlock(&arena->lock); + + return (true); +} + +/* + * Try to resize a large allocation, in order to avoid copying. This will + * always fail if growing an object, and the following run is already in use. + */ +static bool +arena_ralloc_large(void *ptr, size_t size, size_t oldsize) +{ + size_t psize; + + psize = PAGE_CEILING(size); + if (psize == oldsize) { + /* Same size class. */ +#ifdef MALLOC_FILL + if (opt_poison && size < oldsize) { + memset((void *)((uintptr_t)ptr + size), 0xe5, oldsize - + size); + } +#endif + return (false); + } else { + arena_chunk_t *chunk; + arena_t *arena; + + chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); + arena = chunk->arena; + RELEASE_ASSERT(arena->magic == ARENA_MAGIC); + + if (psize < oldsize) { +#ifdef MALLOC_FILL + /* Fill before shrinking in order avoid a race. */ + if (opt_poison) { + memset((void *)((uintptr_t)ptr + size), 0xe5, + oldsize - size); + } +#endif + arena_ralloc_large_shrink(arena, chunk, ptr, psize, + oldsize); + return (false); + } else { + bool ret = arena_ralloc_large_grow(arena, chunk, ptr, + psize, oldsize); +#ifdef MALLOC_FILL + if (ret == false && opt_zero) { + memset((void *)((uintptr_t)ptr + oldsize), 0, + size - oldsize); + } +#endif + return (ret); + } + } +} + +static void * +arena_ralloc(void *ptr, size_t size, size_t oldsize) +{ + void *ret; + size_t copysize; + + /* Try to avoid moving the allocation. */ + if (size < small_min) { + if (oldsize < small_min && + ffs((int)(pow2_ceil(size) >> (TINY_MIN_2POW + 1))) + == ffs((int)(pow2_ceil(oldsize) >> (TINY_MIN_2POW + 1)))) + goto IN_PLACE; /* Same size class. */ + } else if (size <= small_max) { + if (oldsize >= small_min && oldsize <= small_max && + (QUANTUM_CEILING(size) >> opt_quantum_2pow) + == (QUANTUM_CEILING(oldsize) >> opt_quantum_2pow)) + goto IN_PLACE; /* Same size class. */ + } else if (size <= bin_maxclass) { + if (oldsize > small_max && oldsize <= bin_maxclass && + pow2_ceil(size) == pow2_ceil(oldsize)) + goto IN_PLACE; /* Same size class. */ + } else if (oldsize > bin_maxclass && oldsize <= arena_maxclass) { + assert(size > bin_maxclass); + if (arena_ralloc_large(ptr, size, oldsize) == false) + return (ptr); + } + + /* + * If we get here, then size and oldsize are different enough that we + * need to move the object. In that case, fall back to allocating new + * space and copying. + */ + ret = arena_malloc(choose_arena(), size, false); + if (ret == NULL) + return (NULL); + + /* Junk/zero-filling were already done by arena_malloc(). */ + copysize = (size < oldsize) ? size : oldsize; +#ifdef VM_COPY_MIN + if (copysize >= VM_COPY_MIN) + pages_copy(ret, ptr, copysize); + else +#endif + memcpy(ret, ptr, copysize); + idalloc(ptr); + return (ret); +IN_PLACE: +#ifdef MALLOC_FILL + if (opt_poison && size < oldsize) + memset((void *)((uintptr_t)ptr + size), 0xe5, oldsize - size); + else if (opt_zero && size > oldsize) + memset((void *)((uintptr_t)ptr + oldsize), 0, size - oldsize); +#endif + return (ptr); +} + +static inline void * +iralloc(void *ptr, size_t size) +{ + size_t oldsize; + + assert(ptr != NULL); + assert(size != 0); + + oldsize = isalloc(ptr); + + if (size <= arena_maxclass) + return (arena_ralloc(ptr, size, oldsize)); + else + return (huge_ralloc(ptr, size, oldsize)); +} + +static bool +arena_new(arena_t *arena) +{ + unsigned i; + arena_bin_t *bin; + size_t pow2_size, prev_run_size; + + if (malloc_spin_init(&arena->lock)) + return (true); + +#ifdef MALLOC_STATS + memset(&arena->stats, 0, sizeof(arena_stats_t)); +#endif + + /* Initialize chunks. */ + arena_chunk_tree_dirty_new(&arena->chunks_dirty); +#ifdef MALLOC_DOUBLE_PURGE + LinkedList_Init(&arena->chunks_madvised); +#endif + arena->spare = NULL; + + arena->ndirty = 0; + + arena_avail_tree_new(&arena->runs_avail); + +#ifdef MALLOC_BALANCE + arena->contention = 0; +#endif + + /* Initialize bins. */ + prev_run_size = pagesize; + + /* (2^n)-spaced tiny bins. */ + for (i = 0; i < ntbins; i++) { + bin = &arena->bins[i]; + bin->runcur = NULL; + arena_run_tree_new(&bin->runs); + + bin->reg_size = (1ULL << (TINY_MIN_2POW + i)); + + prev_run_size = arena_bin_run_size_calc(bin, prev_run_size); + +#ifdef MALLOC_STATS + memset(&bin->stats, 0, sizeof(malloc_bin_stats_t)); +#endif + } + + /* Quantum-spaced bins. */ + for (; i < ntbins + nqbins; i++) { + bin = &arena->bins[i]; + bin->runcur = NULL; + arena_run_tree_new(&bin->runs); + + bin->reg_size = quantum * (i - ntbins + 1); + + pow2_size = pow2_ceil(quantum * (i - ntbins + 1)); + prev_run_size = arena_bin_run_size_calc(bin, prev_run_size); + +#ifdef MALLOC_STATS + memset(&bin->stats, 0, sizeof(malloc_bin_stats_t)); +#endif + } + + /* (2^n)-spaced sub-page bins. */ + for (; i < ntbins + nqbins + nsbins; i++) { + bin = &arena->bins[i]; + bin->runcur = NULL; + arena_run_tree_new(&bin->runs); + + bin->reg_size = (small_max << (i - (ntbins + nqbins) + 1)); + + prev_run_size = arena_bin_run_size_calc(bin, prev_run_size); + +#ifdef MALLOC_STATS + memset(&bin->stats, 0, sizeof(malloc_bin_stats_t)); +#endif + } + +#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS) + arena->magic = ARENA_MAGIC; +#endif + + return (false); +} + +/* Create a new arena and insert it into the arenas array at index ind. */ +static arena_t * +arenas_extend(unsigned ind) +{ + arena_t *ret; + + /* Allocate enough space for trailing bins. */ + ret = (arena_t *)base_alloc(sizeof(arena_t) + + (sizeof(arena_bin_t) * (ntbins + nqbins + nsbins - 1))); + if (ret != NULL && arena_new(ret) == false) { + arenas[ind] = ret; + return (ret); + } + /* Only reached if there is an OOM error. */ + + /* + * OOM here is quite inconvenient to propagate, since dealing with it + * would require a check for failure in the fast path. Instead, punt + * by using arenas[0]. In practice, this is an extremely unlikely + * failure. + */ + _malloc_message(_getprogname(), + ": (malloc) Error initializing arena\n", "", ""); + if (opt_abort) + abort(); + + return (arenas[0]); +} + +/* + * End arena. + */ +/******************************************************************************/ +/* + * Begin general internal functions. + */ + +static void * +huge_malloc(size_t size, bool zero) +{ + return huge_palloc(size, chunksize, zero); +} + +static void * +huge_palloc(size_t size, size_t alignment, bool zero) +{ + void *ret; + size_t csize; + size_t psize; + extent_node_t *node; + + /* Allocate one or more contiguous chunks for this request. */ + + csize = CHUNK_CEILING(size); + if (csize == 0) { + /* size is large enough to cause size_t wrap-around. */ + return (NULL); + } + + /* Allocate an extent node with which to track the chunk. */ + node = base_node_alloc(); + if (node == NULL) + return (NULL); + + ret = chunk_alloc(csize, alignment, false, zero); + if (ret == NULL) { + base_node_dealloc(node); + return (NULL); + } + + /* Insert node into huge. */ + node->addr = ret; + psize = PAGE_CEILING(size); + node->size = psize; + + malloc_mutex_lock(&huge_mtx); + extent_tree_ad_insert(&huge, node); +#ifdef MALLOC_STATS + huge_nmalloc++; + + /* Although we allocated space for csize bytes, we indicate that we've + * allocated only psize bytes. + * + * If DECOMMIT is defined, this is a reasonable thing to do, since + * we'll explicitly decommit the bytes in excess of psize. + * + * If DECOMMIT is not defined, then we're relying on the OS to be lazy + * about how it allocates physical pages to mappings. If we never + * touch the pages in excess of psize, the OS won't allocate a physical + * page, and we won't use more than psize bytes of physical memory. + * + * A correct program will only touch memory in excess of how much it + * requested if it first calls malloc_usable_size and finds out how + * much space it has to play with. But because we set node->size = + * psize above, malloc_usable_size will return psize, not csize, and + * the program will (hopefully) never touch bytes in excess of psize. + * Thus those bytes won't take up space in physical memory, and we can + * reasonably claim we never "allocated" them in the first place. */ + huge_allocated += psize; + huge_mapped += csize; +#endif + malloc_mutex_unlock(&huge_mtx); + +#ifdef MALLOC_DECOMMIT + if (csize - psize > 0) + pages_decommit((void *)((uintptr_t)ret + psize), csize - psize); +#endif + +#ifdef MALLOC_FILL + if (zero == false) { + if (opt_junk) +# ifdef MALLOC_DECOMMIT + memset(ret, 0xe4, psize); +# else + memset(ret, 0xe4, csize); +# endif + else if (opt_zero) +# ifdef MALLOC_DECOMMIT + memset(ret, 0, psize); +# else + memset(ret, 0, csize); +# endif + } +#endif + + return (ret); +} + +static void * +huge_ralloc(void *ptr, size_t size, size_t oldsize) +{ + void *ret; + size_t copysize; + + /* Avoid moving the allocation if the size class would not change. */ + + if (oldsize > arena_maxclass && + CHUNK_CEILING(size) == CHUNK_CEILING(oldsize)) { + size_t psize = PAGE_CEILING(size); +#ifdef MALLOC_FILL + if (opt_poison && size < oldsize) { + memset((void *)((uintptr_t)ptr + size), 0xe5, oldsize + - size); + } +#endif +#ifdef MALLOC_DECOMMIT + if (psize < oldsize) { + extent_node_t *node, key; + + pages_decommit((void *)((uintptr_t)ptr + psize), + oldsize - psize); + + /* Update recorded size. */ + malloc_mutex_lock(&huge_mtx); + key.addr = __DECONST(void *, ptr); + node = extent_tree_ad_search(&huge, &key); + assert(node != NULL); + assert(node->size == oldsize); +# ifdef MALLOC_STATS + huge_allocated -= oldsize - psize; + /* No need to change huge_mapped, because we didn't + * (un)map anything. */ +# endif + node->size = psize; + malloc_mutex_unlock(&huge_mtx); + } else if (psize > oldsize) { + pages_commit((void *)((uintptr_t)ptr + oldsize), + psize - oldsize); + } +#endif + + /* Although we don't have to commit or decommit anything if + * DECOMMIT is not defined and the size class didn't change, we + * do need to update the recorded size if the size increased, + * so malloc_usable_size doesn't return a value smaller than + * what was requested via realloc(). */ + + if (psize > oldsize) { + /* Update recorded size. */ + extent_node_t *node, key; + malloc_mutex_lock(&huge_mtx); + key.addr = __DECONST(void *, ptr); + node = extent_tree_ad_search(&huge, &key); + assert(node != NULL); + assert(node->size == oldsize); +# ifdef MALLOC_STATS + huge_allocated += psize - oldsize; + /* No need to change huge_mapped, because we didn't + * (un)map anything. */ +# endif + node->size = psize; + malloc_mutex_unlock(&huge_mtx); + } + +#ifdef MALLOC_FILL + if (opt_zero && size > oldsize) { + memset((void *)((uintptr_t)ptr + oldsize), 0, size + - oldsize); + } +#endif + return (ptr); + } + + /* + * If we get here, then size and oldsize are different enough that we + * need to use a different size class. In that case, fall back to + * allocating new space and copying. + */ + ret = huge_malloc(size, false); + if (ret == NULL) + return (NULL); + + copysize = (size < oldsize) ? size : oldsize; +#ifdef VM_COPY_MIN + if (copysize >= VM_COPY_MIN) + pages_copy(ret, ptr, copysize); + else +#endif + memcpy(ret, ptr, copysize); + idalloc(ptr); + return (ret); +} + +static void +huge_dalloc(void *ptr) +{ + extent_node_t *node, key; + + malloc_mutex_lock(&huge_mtx); + + /* Extract from tree of huge allocations. */ + key.addr = ptr; + node = extent_tree_ad_search(&huge, &key); + assert(node != NULL); + assert(node->addr == ptr); + extent_tree_ad_remove(&huge, node); + +#ifdef MALLOC_STATS + huge_ndalloc++; + huge_allocated -= node->size; + huge_mapped -= CHUNK_CEILING(node->size); +#endif + + malloc_mutex_unlock(&huge_mtx); + + /* Unmap chunk. */ + chunk_dealloc(node->addr, CHUNK_CEILING(node->size)); + + base_node_dealloc(node); +} + +#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE +#ifdef MOZ_MEMORY_BSD +static inline unsigned +malloc_ncpus(void) +{ + unsigned ret; + int mib[2]; + size_t len; + + mib[0] = CTL_HW; + mib[1] = HW_NCPU; + len = sizeof(ret); + if (sysctl(mib, 2, &ret, &len, (void *) 0, 0) == -1) { + /* Error. */ + return (1); + } + + return (ret); +} +#elif (defined(MOZ_MEMORY_LINUX)) +#include <fcntl.h> + +static inline unsigned +malloc_ncpus(void) +{ + unsigned ret; + int fd, nread, column; + char buf[1024]; + static const char matchstr[] = "processor\t:"; + int i; + + /* + * sysconf(3) would be the preferred method for determining the number + * of CPUs, but it uses malloc internally, which causes untennable + * recursion during malloc initialization. + */ + fd = open("/proc/cpuinfo", O_RDONLY); + if (fd == -1) + return (1); /* Error. */ + /* + * Count the number of occurrences of matchstr at the beginnings of + * lines. This treats hyperthreaded CPUs as multiple processors. + */ + column = 0; + ret = 0; + while (true) { + nread = read(fd, &buf, sizeof(buf)); + if (nread <= 0) + break; /* EOF or error. */ + for (i = 0;i < nread;i++) { + char c = buf[i]; + if (c == '\n') + column = 0; + else if (column != -1) { + if (c == matchstr[column]) { + column++; + if (column == sizeof(matchstr) - 1) { + column = -1; + ret++; + } + } else + column = -1; + } + } + } + + if (ret == 0) + ret = 1; /* Something went wrong in the parser. */ + close(fd); + + return (ret); +} +#elif (defined(MOZ_MEMORY_DARWIN)) +#include <mach/mach_init.h> +#include <mach/mach_host.h> + +static inline unsigned +malloc_ncpus(void) +{ + kern_return_t error; + natural_t n; + processor_info_array_t pinfo; + mach_msg_type_number_t pinfocnt; + + error = host_processor_info(mach_host_self(), PROCESSOR_BASIC_INFO, + &n, &pinfo, &pinfocnt); + if (error != KERN_SUCCESS) + return (1); /* Error. */ + else + return (n); +} +#elif (defined(MOZ_MEMORY_SOLARIS)) + +static inline unsigned +malloc_ncpus(void) +{ + return sysconf(_SC_NPROCESSORS_ONLN); +} +#else +static inline unsigned +malloc_ncpus(void) +{ + + /* + * We lack a way to determine the number of CPUs on this platform, so + * assume 1 CPU. + */ + return (1); +} +#endif +#endif + +static void +malloc_print_stats(void) +{ + + if (opt_print_stats) { + char s[UMAX2S_BUFSIZE]; + _malloc_message("___ Begin malloc statistics ___\n", "", "", + ""); + _malloc_message("Assertions ", +#ifdef NDEBUG + "disabled", +#else + "enabled", +#endif + "\n", ""); + _malloc_message("Boolean MALLOC_OPTIONS: ", + opt_abort ? "A" : "a", "", ""); +#ifdef MALLOC_FILL + _malloc_message(opt_poison ? "C" : "c", "", "", ""); + _malloc_message(opt_junk ? "J" : "j", "", "", ""); +#endif + _malloc_message("P", "", "", ""); +#ifdef MALLOC_UTRACE + _malloc_message(opt_utrace ? "U" : "u", "", "", ""); +#endif +#ifdef MALLOC_SYSV + _malloc_message(opt_sysv ? "V" : "v", "", "", ""); +#endif +#ifdef MALLOC_XMALLOC + _malloc_message(opt_xmalloc ? "X" : "x", "", "", ""); +#endif +#ifdef MALLOC_FILL + _malloc_message(opt_zero ? "Z" : "z", "", "", ""); +#endif + _malloc_message("\n", "", "", ""); + +#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE + _malloc_message("CPUs: ", umax2s(ncpus, 10, s), "\n", ""); +#endif + _malloc_message("Max arenas: ", umax2s(narenas, 10, s), "\n", + ""); +#ifdef MALLOC_BALANCE + _malloc_message("Arena balance threshold: ", + umax2s(opt_balance_threshold, 10, s), "\n", ""); +#endif + _malloc_message("Pointer size: ", umax2s(sizeof(void *), 10, s), + "\n", ""); + _malloc_message("Quantum size: ", umax2s(quantum, 10, s), "\n", + ""); + _malloc_message("Max small size: ", umax2s(small_max, 10, s), + "\n", ""); + _malloc_message("Max dirty pages per arena: ", + umax2s(opt_dirty_max, 10, s), "\n", ""); + + _malloc_message("Chunk size: ", umax2s(chunksize, 10, s), "", + ""); + _malloc_message(" (2^", umax2s(opt_chunk_2pow, 10, s), ")\n", + ""); + +#ifdef MALLOC_STATS + { + size_t allocated, mapped = 0; +#ifdef MALLOC_BALANCE + uint64_t nbalance = 0; +#endif + unsigned i; + arena_t *arena; + + /* Calculate and print allocated/mapped stats. */ + + /* arenas. */ + for (i = 0, allocated = 0; i < narenas; i++) { + if (arenas[i] != NULL) { + malloc_spin_lock(&arenas[i]->lock); + allocated += + arenas[i]->stats.allocated_small; + allocated += + arenas[i]->stats.allocated_large; + mapped += arenas[i]->stats.mapped; +#ifdef MALLOC_BALANCE + nbalance += arenas[i]->stats.nbalance; +#endif + malloc_spin_unlock(&arenas[i]->lock); + } + } + + /* huge/base. */ + malloc_mutex_lock(&huge_mtx); + allocated += huge_allocated; + mapped += huge_mapped; + malloc_mutex_unlock(&huge_mtx); + + malloc_mutex_lock(&base_mtx); + mapped += base_mapped; + malloc_mutex_unlock(&base_mtx); + +#ifdef MOZ_MEMORY_WINDOWS + malloc_printf("Allocated: %lu, mapped: %lu\n", + allocated, mapped); +#else + malloc_printf("Allocated: %zu, mapped: %zu\n", + allocated, mapped); +#endif + +#ifdef MALLOC_BALANCE + malloc_printf("Arena balance reassignments: %llu\n", + nbalance); +#endif + + /* Print chunk stats. */ + malloc_printf( + "huge: nmalloc ndalloc allocated\n"); +#ifdef MOZ_MEMORY_WINDOWS + malloc_printf(" %12llu %12llu %12lu\n", + huge_nmalloc, huge_ndalloc, huge_allocated); +#else + malloc_printf(" %12llu %12llu %12zu\n", + huge_nmalloc, huge_ndalloc, huge_allocated); +#endif + /* Print stats for each arena. */ + for (i = 0; i < narenas; i++) { + arena = arenas[i]; + if (arena != NULL) { + malloc_printf( + "\narenas[%u]:\n", i); + malloc_spin_lock(&arena->lock); + stats_print(arena); + malloc_spin_unlock(&arena->lock); + } + } + } +#endif /* #ifdef MALLOC_STATS */ + _malloc_message("--- End malloc statistics ---\n", "", "", ""); + } +} + +/* + * FreeBSD's pthreads implementation calls malloc(3), so the malloc + * implementation has to take pains to avoid infinite recursion during + * initialization. + */ +#if (defined(MOZ_MEMORY_WINDOWS) || defined(MOZ_MEMORY_DARWIN)) +#define malloc_init() false +#else +static inline bool +malloc_init(void) +{ + + if (malloc_initialized == false) + return (malloc_init_hard()); + + return (false); +} +#endif + +#if !defined(MOZ_MEMORY_WINDOWS) +static +#endif +bool +malloc_init_hard(void) +{ + unsigned i; + char buf[PATH_MAX + 1]; + const char *opts; + long result; +#ifndef MOZ_MEMORY_WINDOWS + int linklen; +#endif +#ifdef MOZ_MEMORY_DARWIN + malloc_zone_t* default_zone; +#endif + +#ifndef MOZ_MEMORY_WINDOWS + malloc_mutex_lock(&init_lock); +#endif + + if (malloc_initialized) { + /* + * Another thread initialized the allocator before this one + * acquired init_lock. + */ +#ifndef MOZ_MEMORY_WINDOWS + malloc_mutex_unlock(&init_lock); +#endif + return (false); + } + +#ifdef MOZ_MEMORY_WINDOWS + /* get a thread local storage index */ + tlsIndex = TlsAlloc(); +#endif + + /* Get page size and number of CPUs */ +#ifdef MOZ_MEMORY_WINDOWS + { + SYSTEM_INFO info; + + GetSystemInfo(&info); + result = info.dwPageSize; + +#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE + ncpus = info.dwNumberOfProcessors; +#endif + } +#else +#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE + ncpus = malloc_ncpus(); +#endif + + result = sysconf(_SC_PAGESIZE); + assert(result != -1); +#endif + + /* We assume that the page size is a power of 2. */ + assert(((result - 1) & result) == 0); +#ifdef MALLOC_STATIC_SIZES + if (pagesize % (size_t) result) { + _malloc_message(_getprogname(), + "Compile-time page size does not divide the runtime one.\n", + "", ""); + abort(); + } +#else + pagesize = (size_t) result; + pagesize_mask = (size_t) result - 1; + pagesize_2pow = ffs((int)result) - 1; +#endif + + for (i = 0; i < 3; i++) { + unsigned j; + + /* Get runtime configuration. */ + switch (i) { + case 0: +#ifndef MOZ_MEMORY_WINDOWS + if ((linklen = readlink("/etc/malloc.conf", buf, + sizeof(buf) - 1)) != -1) { + /* + * Use the contents of the "/etc/malloc.conf" + * symbolic link's name. + */ + buf[linklen] = '\0'; + opts = buf; + } else +#endif + { + /* No configuration specified. */ + buf[0] = '\0'; + opts = buf; + } + break; + case 1: + if ((opts = getenv("MALLOC_OPTIONS")) != NULL) { + /* + * Do nothing; opts is already initialized to + * the value of the MALLOC_OPTIONS environment + * variable. + */ + } else { + /* No configuration specified. */ + buf[0] = '\0'; + opts = buf; + } + break; + case 2: + if (_malloc_options != NULL) { + /* + * Use options that were compiled into the + * program. + */ + opts = _malloc_options; + } else { + /* No configuration specified. */ + buf[0] = '\0'; + opts = buf; + } + break; + default: + /* NOTREACHED */ + buf[0] = '\0'; + opts = buf; + assert(false); + } + + for (j = 0; opts[j] != '\0'; j++) { + unsigned k, nreps; + bool nseen; + + /* Parse repetition count, if any. */ + for (nreps = 0, nseen = false;; j++, nseen = true) { + switch (opts[j]) { + case '0': case '1': case '2': case '3': + case '4': case '5': case '6': case '7': + case '8': case '9': + nreps *= 10; + nreps += opts[j] - '0'; + break; + default: + goto MALLOC_OUT; + } + } +MALLOC_OUT: + if (nseen == false) + nreps = 1; + + for (k = 0; k < nreps; k++) { + switch (opts[j]) { + case 'a': + opt_abort = false; + break; + case 'A': + opt_abort = true; + break; + case 'b': +#ifdef MALLOC_BALANCE + opt_balance_threshold >>= 1; +#endif + break; + case 'B': +#ifdef MALLOC_BALANCE + if (opt_balance_threshold == 0) + opt_balance_threshold = 1; + else if ((opt_balance_threshold << 1) + > opt_balance_threshold) + opt_balance_threshold <<= 1; +#endif + break; +#ifdef MALLOC_FILL +#ifndef MALLOC_PRODUCTION + case 'c': + opt_poison = false; + break; + case 'C': + opt_poison = true; + break; +#endif +#endif + case 'f': + opt_dirty_max >>= 1; + break; + case 'F': + if (opt_dirty_max == 0) + opt_dirty_max = 1; + else if ((opt_dirty_max << 1) != 0) + opt_dirty_max <<= 1; + break; +#ifdef MALLOC_FILL +#ifndef MALLOC_PRODUCTION + case 'j': + opt_junk = false; + break; + case 'J': + opt_junk = true; + break; +#endif +#endif +#ifndef MALLOC_STATIC_SIZES + case 'k': + /* + * Chunks always require at least one + * header page, so chunks can never be + * smaller than two pages. + */ + if (opt_chunk_2pow > pagesize_2pow + 1) + opt_chunk_2pow--; + break; + case 'K': + if (opt_chunk_2pow + 1 < + (sizeof(size_t) << 3)) + opt_chunk_2pow++; + break; +#endif + case 'n': + opt_narenas_lshift--; + break; + case 'N': + opt_narenas_lshift++; + break; + case 'p': + opt_print_stats = false; + break; + case 'P': + opt_print_stats = true; + break; +#ifndef MALLOC_STATIC_SIZES + case 'q': + if (opt_quantum_2pow > QUANTUM_2POW_MIN) + opt_quantum_2pow--; + break; + case 'Q': + if (opt_quantum_2pow < pagesize_2pow - + 1) + opt_quantum_2pow++; + break; + case 's': + if (opt_small_max_2pow > + QUANTUM_2POW_MIN) + opt_small_max_2pow--; + break; + case 'S': + if (opt_small_max_2pow < pagesize_2pow + - 1) + opt_small_max_2pow++; + break; +#endif +#ifdef MALLOC_UTRACE + case 'u': + opt_utrace = false; + break; + case 'U': + opt_utrace = true; + break; +#endif +#ifdef MALLOC_SYSV + case 'v': + opt_sysv = false; + break; + case 'V': + opt_sysv = true; + break; +#endif +#ifdef MALLOC_XMALLOC + case 'x': + opt_xmalloc = false; + break; + case 'X': + opt_xmalloc = true; + break; +#endif +#ifdef MALLOC_FILL +#ifndef MALLOC_PRODUCTION + case 'z': + opt_zero = false; + break; + case 'Z': + opt_zero = true; + break; +#endif +#endif + default: { + char cbuf[2]; + + cbuf[0] = opts[j]; + cbuf[1] = '\0'; + _malloc_message(_getprogname(), + ": (malloc) Unsupported character " + "in malloc options: '", cbuf, + "'\n"); + } + } + } + } + } + + /* Take care to call atexit() only once. */ + if (opt_print_stats) { +#ifndef MOZ_MEMORY_WINDOWS + /* Print statistics at exit. */ + atexit(malloc_print_stats); +#endif + } + +#ifndef MALLOC_STATIC_SIZES + /* Set variables according to the value of opt_small_max_2pow. */ + if (opt_small_max_2pow < opt_quantum_2pow) + opt_small_max_2pow = opt_quantum_2pow; + small_max = (1U << opt_small_max_2pow); + + /* Set bin-related variables. */ + bin_maxclass = (pagesize >> 1); + assert(opt_quantum_2pow >= TINY_MIN_2POW); + ntbins = opt_quantum_2pow - TINY_MIN_2POW; + assert(ntbins <= opt_quantum_2pow); + nqbins = (small_max >> opt_quantum_2pow); + nsbins = pagesize_2pow - opt_small_max_2pow - 1; + + /* Set variables according to the value of opt_quantum_2pow. */ + quantum = (1U << opt_quantum_2pow); + quantum_mask = quantum - 1; + if (ntbins > 0) + small_min = (quantum >> 1) + 1; + else + small_min = 1; + assert(small_min <= quantum); + + /* Set variables according to the value of opt_chunk_2pow. */ + chunksize = (1LU << opt_chunk_2pow); + chunksize_mask = chunksize - 1; + chunk_npages = (chunksize >> pagesize_2pow); + + arena_chunk_header_npages = calculate_arena_header_pages(); + arena_maxclass = calculate_arena_maxclass(); + + recycle_limit = CHUNK_RECYCLE_LIMIT * chunksize; +#endif + + recycled_size = 0; + +#ifdef JEMALLOC_USES_MAP_ALIGN + /* + * When using MAP_ALIGN, the alignment parameter must be a power of two + * multiple of the system pagesize, or mmap will fail. + */ + assert((chunksize % pagesize) == 0); + assert((1 << (ffs(chunksize / pagesize) - 1)) == (chunksize/pagesize)); +#endif + + UTRACE(0, 0, 0); + + /* Various sanity checks that regard configuration. */ + assert(quantum >= sizeof(void *)); + assert(quantum <= pagesize); + assert(chunksize >= pagesize); + assert(quantum * 4 <= chunksize); + + /* Initialize chunks data. */ + malloc_mutex_init(&chunks_mtx); + extent_tree_szad_new(&chunks_szad_mmap); + extent_tree_ad_new(&chunks_ad_mmap); + + /* Initialize huge allocation data. */ + malloc_mutex_init(&huge_mtx); + extent_tree_ad_new(&huge); +#ifdef MALLOC_STATS + huge_nmalloc = 0; + huge_ndalloc = 0; + huge_allocated = 0; + huge_mapped = 0; +#endif + + /* Initialize base allocation data structures. */ +#ifdef MALLOC_STATS + base_mapped = 0; + base_committed = 0; +#endif + base_nodes = NULL; + malloc_mutex_init(&base_mtx); + +#ifdef MOZ_MEMORY_NARENAS_DEFAULT_ONE + narenas = 1; +#else + if (ncpus > 1) { + /* + * For SMP systems, create four times as many arenas as there + * are CPUs by default. + */ + opt_narenas_lshift += 2; + } + + /* Determine how many arenas to use. */ + narenas = ncpus; +#endif + if (opt_narenas_lshift > 0) { + if ((narenas << opt_narenas_lshift) > narenas) + narenas <<= opt_narenas_lshift; + /* + * Make sure not to exceed the limits of what base_alloc() can + * handle. + */ + if (narenas * sizeof(arena_t *) > chunksize) + narenas = chunksize / sizeof(arena_t *); + } else if (opt_narenas_lshift < 0) { + if ((narenas >> -opt_narenas_lshift) < narenas) + narenas >>= -opt_narenas_lshift; + /* Make sure there is at least one arena. */ + if (narenas == 0) + narenas = 1; + } +#ifdef MALLOC_BALANCE + assert(narenas != 0); + for (narenas_2pow = 0; + (narenas >> (narenas_2pow + 1)) != 0; + narenas_2pow++); +#endif + +#ifdef NO_TLS + if (narenas > 1) { + static const unsigned primes[] = {1, 3, 5, 7, 11, 13, 17, 19, + 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, + 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, + 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, + 223, 227, 229, 233, 239, 241, 251, 257, 263}; + unsigned nprimes, parenas; + + /* + * Pick a prime number of hash arenas that is more than narenas + * so that direct hashing of pthread_self() pointers tends to + * spread allocations evenly among the arenas. + */ + assert((narenas & 1) == 0); /* narenas must be even. */ + nprimes = (sizeof(primes) >> SIZEOF_INT_2POW); + parenas = primes[nprimes - 1]; /* In case not enough primes. */ + for (i = 1; i < nprimes; i++) { + if (primes[i] > narenas) { + parenas = primes[i]; + break; + } + } + narenas = parenas; + } +#endif + +#ifndef NO_TLS +# ifndef MALLOC_BALANCE + next_arena = 0; +# endif +#endif + + /* Allocate and initialize arenas. */ + arenas = (arena_t **)base_alloc(sizeof(arena_t *) * narenas); + if (arenas == NULL) { +#ifndef MOZ_MEMORY_WINDOWS + malloc_mutex_unlock(&init_lock); +#endif + return (true); + } + /* + * Zero the array. In practice, this should always be pre-zeroed, + * since it was just mmap()ed, but let's be sure. + */ + memset(arenas, 0, sizeof(arena_t *) * narenas); + + /* + * Initialize one arena here. The rest are lazily created in + * choose_arena_hard(). + */ + arenas_extend(0); + if (arenas[0] == NULL) { +#ifndef MOZ_MEMORY_WINDOWS + malloc_mutex_unlock(&init_lock); +#endif + return (true); + } +#ifndef NO_TLS + /* + * Assign the initial arena to the initial thread, in order to avoid + * spurious creation of an extra arena if the application switches to + * threaded mode. + */ +#ifdef MOZ_MEMORY_WINDOWS + TlsSetValue(tlsIndex, arenas[0]); +#else + arenas_map = arenas[0]; +#endif +#endif + + /* + * Seed here for the initial thread, since choose_arena_hard() is only + * called for other threads. The seed value doesn't really matter. + */ +#ifdef MALLOC_BALANCE + SPRN(balance, 42); +#endif + + malloc_spin_init(&arenas_lock); + +#ifdef MALLOC_VALIDATE + chunk_rtree = malloc_rtree_new((SIZEOF_PTR << 3) - opt_chunk_2pow); + if (chunk_rtree == NULL) + return (true); +#endif + + malloc_initialized = true; + +#if !defined(MOZ_MEMORY_WINDOWS) && !defined(MOZ_MEMORY_DARWIN) + /* Prevent potential deadlock on malloc locks after fork. */ + pthread_atfork(_malloc_prefork, _malloc_postfork, _malloc_postfork); +#endif + +#if defined(NEEDS_PTHREAD_MMAP_UNALIGNED_TSD) + if (pthread_key_create(&mmap_unaligned_tsd, NULL) != 0) { + malloc_printf("<jemalloc>: Error in pthread_key_create()\n"); + } +#endif + +#if defined(MOZ_MEMORY_DARWIN) && !defined(MOZ_REPLACE_MALLOC) + /* + * Overwrite the default memory allocator to use jemalloc everywhere. + */ + default_zone = malloc_default_zone(); + + /* + * We only use jemalloc with MacOS 10.6 and 10.7. jemalloc is disabled + * on 32-bit builds (10.5 and 32-bit 10.6) due to bug 702250, an + * apparent MacOS bug. In fact, this code isn't even compiled on + * 32-bit builds. + * + * We'll have to update our code to work with newer versions, because + * the malloc zone layout is likely to change. + */ + + osx_use_jemalloc = (default_zone->version == SNOW_LEOPARD_MALLOC_ZONE_T_VERSION || + default_zone->version == LION_MALLOC_ZONE_T_VERSION); + + /* Allow us dynamically turn off jemalloc for testing. */ + if (getenv("NO_MAC_JEMALLOC")) { + osx_use_jemalloc = false; +#ifdef __i386__ + malloc_printf("Warning: NO_MAC_JEMALLOC has no effect on " + "i386 machines (such as this one).\n"); +#endif + } + + if (osx_use_jemalloc) { + /* + * Convert the default szone to an "overlay zone" that is capable + * of deallocating szone-allocated objects, but allocating new + * objects from jemalloc. + */ + size_t size = zone_version_size(default_zone->version); + szone2ozone(default_zone, size); + } + else { + szone = default_zone; + } +#endif + +#ifndef MOZ_MEMORY_WINDOWS + malloc_mutex_unlock(&init_lock); +#endif + return (false); +} + +/* XXX Why not just expose malloc_print_stats()? */ +#ifdef MOZ_MEMORY_WINDOWS +void +malloc_shutdown() +{ + + malloc_print_stats(); +} +#endif + +/* + * End general internal functions. + */ +/******************************************************************************/ +/* + * Begin malloc(3)-compatible functions. + */ + +/* + * Even though we compile with MOZ_MEMORY, we may have to dynamically decide + * not to use jemalloc, as discussed above. However, we call jemalloc + * functions directly from mozalloc. Since it's pretty dangerous to mix the + * allocators, we need to call the OSX allocators from the functions below, + * when osx_use_jemalloc is not (dynamically) set. + * + * Note that we assume jemalloc is enabled on i386. This is safe because the + * only i386 versions of MacOS are 10.5 and 10.6, which we support. We have to + * do this because madvise isn't in the malloc zone struct for 10.5. + * + * This means that NO_MAC_JEMALLOC doesn't work on i386. + */ +#if defined(MOZ_MEMORY_DARWIN) && !defined(__i386__) && !defined(MOZ_REPLACE_MALLOC) +#define DARWIN_ONLY(A) if (!osx_use_jemalloc) { A; } +#else +#define DARWIN_ONLY(A) +#endif + +MOZ_MEMORY_API void * +malloc_impl(size_t size) +{ + void *ret; + + DARWIN_ONLY(return (szone->malloc)(szone, size)); + + if (malloc_init()) { + ret = NULL; + goto RETURN; + } + + if (size == 0) { +#ifdef MALLOC_SYSV + if (opt_sysv == false) +#endif + size = 1; +#ifdef MALLOC_SYSV + else { + ret = NULL; + goto RETURN; + } +#endif + } + + ret = imalloc(size); + +RETURN: + if (ret == NULL) { +#ifdef MALLOC_XMALLOC + if (opt_xmalloc) { + _malloc_message(_getprogname(), + ": (malloc) Error in malloc(): out of memory\n", "", + ""); + abort(); + } +#endif + errno = ENOMEM; + } + + UTRACE(0, size, ret); + return (ret); +} + +/* + * In ELF systems the default visibility allows symbols to be preempted at + * runtime. This in turn prevents the uses of memalign in this file from being + * optimized. What we do in here is define two aliasing symbols (they point to + * the same code): memalign and memalign_internal. The internal version has + * hidden visibility and is used in every reference from this file. + * + * For more information on this technique, see section 2.2.7 (Avoid Using + * Exported Symbols) in http://www.akkadia.org/drepper/dsohowto.pdf. + */ + +#ifndef MOZ_REPLACE_MALLOC +#if defined(__GNUC__) && !defined(MOZ_MEMORY_DARWIN) +#define MOZ_MEMORY_ELF +#endif + +#ifdef MOZ_MEMORY_SOLARIS +# ifdef __SUNPRO_C +void * +memalign_impl(size_t alignment, size_t size); +#pragma no_inline(memalign_impl) +# elif (defined(__GNUC__)) +__attribute__((noinline)) +# endif +#else +#if (defined(MOZ_MEMORY_ELF)) +__attribute__((visibility ("hidden"))) +#endif +#endif +#endif /* MOZ_REPLACE_MALLOC */ + +#ifdef MOZ_MEMORY_ELF +#define MEMALIGN memalign_internal +#else +#define MEMALIGN memalign_impl +#endif + +#ifndef MOZ_MEMORY_ELF +MOZ_MEMORY_API +#endif +void * +MEMALIGN(size_t alignment, size_t size) +{ + void *ret; + + DARWIN_ONLY(return (szone->memalign)(szone, alignment, size)); + + assert(((alignment - 1) & alignment) == 0); + + if (malloc_init()) { + ret = NULL; + goto RETURN; + } + + if (size == 0) { +#ifdef MALLOC_SYSV + if (opt_sysv == false) +#endif + size = 1; +#ifdef MALLOC_SYSV + else { + ret = NULL; + goto RETURN; + } +#endif + } + + alignment = alignment < sizeof(void*) ? sizeof(void*) : alignment; + ret = ipalloc(alignment, size); + +RETURN: +#ifdef MALLOC_XMALLOC + if (opt_xmalloc && ret == NULL) { + _malloc_message(_getprogname(), + ": (malloc) Error in memalign(): out of memory\n", "", ""); + abort(); + } +#endif + UTRACE(0, size, ret); + return (ret); +} + +#ifdef MOZ_MEMORY_ELF +extern void * +memalign_impl(size_t alignment, size_t size) __attribute__((alias ("memalign_internal"), visibility ("default"))); +#endif + +MOZ_MEMORY_API int +posix_memalign_impl(void **memptr, size_t alignment, size_t size) +{ + void *result; + + /* Make sure that alignment is a large enough power of 2. */ + if (((alignment - 1) & alignment) != 0 || alignment < sizeof(void *)) { +#ifdef MALLOC_XMALLOC + if (opt_xmalloc) { + _malloc_message(_getprogname(), + ": (malloc) Error in posix_memalign(): " + "invalid alignment\n", "", ""); + abort(); + } +#endif + return (EINVAL); + } + + /* The 0-->1 size promotion is done in the memalign() call below */ + + result = MEMALIGN(alignment, size); + + if (result == NULL) + return (ENOMEM); + + *memptr = result; + return (0); +} + +MOZ_MEMORY_API void * +aligned_alloc_impl(size_t alignment, size_t size) +{ + if (size % alignment) { +#ifdef MALLOC_XMALLOC + if (opt_xmalloc) { + _malloc_message(_getprogname(), + ": (malloc) Error in aligned_alloc(): " + "size is not multiple of alignment\n", "", ""); + abort(); + } +#endif + return (NULL); + } + return MEMALIGN(alignment, size); +} + +MOZ_MEMORY_API void * +valloc_impl(size_t size) +{ + return (MEMALIGN(pagesize, size)); +} + +MOZ_MEMORY_API void * +calloc_impl(size_t num, size_t size) +{ + void *ret; + size_t num_size; + + DARWIN_ONLY(return (szone->calloc)(szone, num, size)); + + if (malloc_init()) { + num_size = 0; + ret = NULL; + goto RETURN; + } + + num_size = num * size; + if (num_size == 0) { +#ifdef MALLOC_SYSV + if ((opt_sysv == false) && ((num == 0) || (size == 0))) +#endif + num_size = 1; +#ifdef MALLOC_SYSV + else { + ret = NULL; + goto RETURN; + } +#endif + /* + * Try to avoid division here. We know that it isn't possible to + * overflow during multiplication if neither operand uses any of the + * most significant half of the bits in a size_t. + */ + } else if (((num | size) & (SIZE_T_MAX << (sizeof(size_t) << 2))) + && (num_size / size != num)) { + /* size_t overflow. */ + ret = NULL; + goto RETURN; + } + + ret = icalloc(num_size); + +RETURN: + if (ret == NULL) { +#ifdef MALLOC_XMALLOC + if (opt_xmalloc) { + _malloc_message(_getprogname(), + ": (malloc) Error in calloc(): out of memory\n", "", + ""); + abort(); + } +#endif + errno = ENOMEM; + } + + UTRACE(0, num_size, ret); + return (ret); +} + +MOZ_MEMORY_API void * +realloc_impl(void *ptr, size_t size) +{ + void *ret; + + DARWIN_ONLY(return (szone->realloc)(szone, ptr, size)); + + if (size == 0) { +#ifdef MALLOC_SYSV + if (opt_sysv == false) +#endif + size = 1; +#ifdef MALLOC_SYSV + else { + if (ptr != NULL) + idalloc(ptr); + ret = NULL; + goto RETURN; + } +#endif + } + + if (ptr != NULL) { + assert(malloc_initialized); + + ret = iralloc(ptr, size); + + if (ret == NULL) { +#ifdef MALLOC_XMALLOC + if (opt_xmalloc) { + _malloc_message(_getprogname(), + ": (malloc) Error in realloc(): out of " + "memory\n", "", ""); + abort(); + } +#endif + errno = ENOMEM; + } + } else { + if (malloc_init()) + ret = NULL; + else + ret = imalloc(size); + + if (ret == NULL) { +#ifdef MALLOC_XMALLOC + if (opt_xmalloc) { + _malloc_message(_getprogname(), + ": (malloc) Error in realloc(): out of " + "memory\n", "", ""); + abort(); + } +#endif + errno = ENOMEM; + } + } + +#ifdef MALLOC_SYSV +RETURN: +#endif + UTRACE(ptr, size, ret); + return (ret); +} + +MOZ_MEMORY_API void +free_impl(void *ptr) +{ + size_t offset; + + DARWIN_ONLY((szone->free)(szone, ptr); return); + + UTRACE(ptr, 0, 0); + + /* + * A version of idalloc that checks for NULL pointer but only for + * huge allocations assuming that CHUNK_ADDR2OFFSET(NULL) == 0. + */ + assert(CHUNK_ADDR2OFFSET(NULL) == 0); + offset = CHUNK_ADDR2OFFSET(ptr); + if (offset != 0) + arena_dalloc(ptr, offset); + else if (ptr != NULL) + huge_dalloc(ptr); +} + +/* + * End malloc(3)-compatible functions. + */ +/******************************************************************************/ +/* + * Begin non-standard functions. + */ + +/* This was added by Mozilla for use by SQLite. */ +#if defined(MOZ_MEMORY_DARWIN) && !defined(MOZ_REPLACE_MALLOC) +static +#else +MOZ_MEMORY_API +#endif +size_t +malloc_good_size_impl(size_t size) +{ + /* + * This duplicates the logic in imalloc(), arena_malloc() and + * arena_malloc_small(). + */ + if (size < small_min) { + /* Small (tiny). */ + size = pow2_ceil(size); + /* + * We omit the #ifdefs from arena_malloc_small() -- + * it can be inaccurate with its size in some cases, but this + * function must be accurate. + */ + if (size < (1U << TINY_MIN_2POW)) + size = (1U << TINY_MIN_2POW); + } else if (size <= small_max) { + /* Small (quantum-spaced). */ + size = QUANTUM_CEILING(size); + } else if (size <= bin_maxclass) { + /* Small (sub-page). */ + size = pow2_ceil(size); + } else if (size <= arena_maxclass) { + /* Large. */ + size = PAGE_CEILING(size); + } else { + /* + * Huge. We use PAGE_CEILING to get psize, instead of using + * CHUNK_CEILING to get csize. This ensures that this + * malloc_usable_size(malloc(n)) always matches + * malloc_good_size(n). + */ + size = PAGE_CEILING(size); + } + return size; +} + + +MOZ_MEMORY_API size_t +malloc_usable_size_impl(MALLOC_USABLE_SIZE_CONST_PTR void *ptr) +{ + DARWIN_ONLY(return (szone->size)(szone, ptr)); + +#ifdef MALLOC_VALIDATE + return (isalloc_validate(ptr)); +#else + assert(ptr != NULL); + + return (isalloc(ptr)); +#endif +} + +MOZ_JEMALLOC_API void +jemalloc_stats_impl(jemalloc_stats_t *stats) +{ + size_t i, non_arena_mapped, chunk_header_size; + + assert(stats != NULL); + + /* + * Gather runtime settings. + */ + stats->opt_abort = opt_abort; + stats->opt_junk = +#ifdef MALLOC_FILL + opt_junk ? true : +#endif + false; + stats->opt_poison = +#ifdef MALLOC_FILL + opt_poison ? true : +#endif + false; + stats->opt_utrace = +#ifdef MALLOC_UTRACE + opt_utrace ? true : +#endif + false; + stats->opt_sysv = +#ifdef MALLOC_SYSV + opt_sysv ? true : +#endif + false; + stats->opt_xmalloc = +#ifdef MALLOC_XMALLOC + opt_xmalloc ? true : +#endif + false; + stats->opt_zero = +#ifdef MALLOC_FILL + opt_zero ? true : +#endif + false; + stats->narenas = narenas; + stats->balance_threshold = +#ifdef MALLOC_BALANCE + opt_balance_threshold +#else + SIZE_T_MAX +#endif + ; + stats->quantum = quantum; + stats->small_max = small_max; + stats->large_max = arena_maxclass; + stats->chunksize = chunksize; + stats->dirty_max = opt_dirty_max; + + /* + * Gather current memory usage statistics. + */ + stats->mapped = 0; + stats->allocated = 0; + stats->waste = 0; + stats->page_cache = 0; + stats->bookkeeping = 0; + stats->bin_unused = 0; + + non_arena_mapped = 0; + + /* Get huge mapped/allocated. */ + malloc_mutex_lock(&huge_mtx); + non_arena_mapped += huge_mapped; + stats->allocated += huge_allocated; + assert(huge_mapped >= huge_allocated); + malloc_mutex_unlock(&huge_mtx); + + /* Get base mapped/allocated. */ + malloc_mutex_lock(&base_mtx); + non_arena_mapped += base_mapped; + stats->bookkeeping += base_committed; + assert(base_mapped >= base_committed); + malloc_mutex_unlock(&base_mtx); + + /* Iterate over arenas. */ + for (i = 0; i < narenas; i++) { + arena_t *arena = arenas[i]; + size_t arena_mapped, arena_allocated, arena_committed, arena_dirty, j, + arena_unused, arena_headers; + arena_run_t* run; + arena_chunk_map_t* mapelm; + + if (arena == NULL) { + continue; + } + + arena_headers = 0; + arena_unused = 0; + + malloc_spin_lock(&arena->lock); + + arena_mapped = arena->stats.mapped; + + /* "committed" counts dirty and allocated memory. */ + arena_committed = arena->stats.committed << pagesize_2pow; + + arena_allocated = arena->stats.allocated_small + + arena->stats.allocated_large; + + arena_dirty = arena->ndirty << pagesize_2pow; + + for (j = 0; j < ntbins + nqbins + nsbins; j++) { + arena_bin_t* bin = &arena->bins[j]; + size_t bin_unused = 0; + + rb_foreach_begin(arena_chunk_map_t, link, &bin->runs, mapelm) { + run = (arena_run_t *)(mapelm->bits & ~pagesize_mask); + bin_unused += run->nfree * bin->reg_size; + } rb_foreach_end(arena_chunk_map_t, link, &bin->runs, mapelm) + + if (bin->runcur) { + bin_unused += bin->runcur->nfree * bin->reg_size; + } + + arena_unused += bin_unused; + arena_headers += bin->stats.curruns * bin->reg0_offset; + } + + malloc_spin_unlock(&arena->lock); + + assert(arena_mapped >= arena_committed); + assert(arena_committed >= arena_allocated + arena_dirty); + + /* "waste" is committed memory that is neither dirty nor + * allocated. */ + stats->mapped += arena_mapped; + stats->allocated += arena_allocated; + stats->page_cache += arena_dirty; + stats->waste += arena_committed - + arena_allocated - arena_dirty - arena_unused - arena_headers; + stats->bin_unused += arena_unused; + stats->bookkeeping += arena_headers; + } + + /* Account for arena chunk headers in bookkeeping rather than waste. */ + chunk_header_size = + ((stats->mapped / stats->chunksize) * arena_chunk_header_npages) << + pagesize_2pow; + + stats->mapped += non_arena_mapped; + stats->bookkeeping += chunk_header_size; + stats->waste -= chunk_header_size; + + assert(stats->mapped >= stats->allocated + stats->waste + + stats->page_cache + stats->bookkeeping); +} + +#ifdef MALLOC_DOUBLE_PURGE + +/* Explicitly remove all of this chunk's MADV_FREE'd pages from memory. */ +static void +hard_purge_chunk(arena_chunk_t *chunk) +{ + /* See similar logic in arena_purge(). */ + + size_t i; + for (i = arena_chunk_header_npages; i < chunk_npages; i++) { + /* Find all adjacent pages with CHUNK_MAP_MADVISED set. */ + size_t npages; + for (npages = 0; + chunk->map[i + npages].bits & CHUNK_MAP_MADVISED && i + npages < chunk_npages; + npages++) { + /* Turn off the chunk's MADV_FREED bit and turn on its + * DECOMMITTED bit. */ + RELEASE_ASSERT(!(chunk->map[i + npages].bits & CHUNK_MAP_DECOMMITTED)); + chunk->map[i + npages].bits ^= CHUNK_MAP_MADVISED_OR_DECOMMITTED; + } + + /* We could use mincore to find out which pages are actually + * present, but it's not clear that's better. */ + if (npages > 0) { + pages_decommit(((char*)chunk) + (i << pagesize_2pow), npages << pagesize_2pow); + pages_commit(((char*)chunk) + (i << pagesize_2pow), npages << pagesize_2pow); + } + i += npages; + } +} + +/* Explicitly remove all of this arena's MADV_FREE'd pages from memory. */ +static void +hard_purge_arena(arena_t *arena) +{ + malloc_spin_lock(&arena->lock); + + while (!LinkedList_IsEmpty(&arena->chunks_madvised)) { + LinkedList* next = arena->chunks_madvised.next; + arena_chunk_t *chunk = + LinkedList_Get(arena->chunks_madvised.next, + arena_chunk_t, chunks_madvised_elem); + hard_purge_chunk(chunk); + LinkedList_Remove(&chunk->chunks_madvised_elem); + } + + malloc_spin_unlock(&arena->lock); +} + +MOZ_JEMALLOC_API void +jemalloc_purge_freed_pages_impl() +{ + size_t i; + for (i = 0; i < narenas; i++) { + arena_t *arena = arenas[i]; + if (arena != NULL) + hard_purge_arena(arena); + } + if (!config_munmap || config_recycle) { + malloc_mutex_lock(&chunks_mtx); + extent_node_t *node = extent_tree_szad_first(&chunks_szad_mmap); + while (node) { + pages_decommit(node->addr, node->size); + pages_commit(node->addr, node->size); + node->zeroed = true; + node = extent_tree_szad_next(&chunks_szad_mmap, node); + } + malloc_mutex_unlock(&chunks_mtx); + } +} + +#else /* !defined MALLOC_DOUBLE_PURGE */ + +MOZ_JEMALLOC_API void +jemalloc_purge_freed_pages_impl() +{ + /* Do nothing. */ +} + +#endif /* defined MALLOC_DOUBLE_PURGE */ + + + +#ifdef MOZ_MEMORY_WINDOWS +void* +_recalloc(void *ptr, size_t count, size_t size) +{ + size_t oldsize = (ptr != NULL) ? isalloc(ptr) : 0; + size_t newsize = count * size; + + /* + * In order for all trailing bytes to be zeroed, the caller needs to + * use calloc(), followed by recalloc(). However, the current calloc() + * implementation only zeros the bytes requested, so if recalloc() is + * to work 100% correctly, calloc() will need to change to zero + * trailing bytes. + */ + + ptr = realloc_impl(ptr, newsize); + if (ptr != NULL && oldsize < newsize) { + memset((void *)((uintptr_t)ptr + oldsize), 0, newsize - + oldsize); + } + + return ptr; +} + +/* + * This impl of _expand doesn't ever actually expand or shrink blocks: it + * simply replies that you may continue using a shrunk block. + */ +void* +_expand(void *ptr, size_t newsize) +{ + if (isalloc(ptr) >= newsize) + return ptr; + + return NULL; +} + +size_t +_msize(void *ptr) +{ + + return malloc_usable_size_impl(ptr); +} +#endif + +MOZ_JEMALLOC_API void +jemalloc_free_dirty_pages_impl(void) +{ + size_t i; + for (i = 0; i < narenas; i++) { + arena_t *arena = arenas[i]; + + if (arena != NULL) { + malloc_spin_lock(&arena->lock); + arena_purge(arena, true); + malloc_spin_unlock(&arena->lock); + } + } +} + +/* + * End non-standard functions. + */ +/******************************************************************************/ +/* + * Begin library-private functions, used by threading libraries for protection + * of malloc during fork(). These functions are only called if the program is + * running in threaded mode, so there is no need to check whether the program + * is threaded here. + */ + +static void +_malloc_prefork(void) +{ + unsigned i; + + /* Acquire all mutexes in a safe order. */ + + malloc_spin_lock(&arenas_lock); + for (i = 0; i < narenas; i++) { + if (arenas[i] != NULL) + malloc_spin_lock(&arenas[i]->lock); + } + + malloc_mutex_lock(&base_mtx); + + malloc_mutex_lock(&huge_mtx); +} + +static void +_malloc_postfork(void) +{ + unsigned i; + + /* Release all mutexes, now that fork() has completed. */ + + malloc_mutex_unlock(&huge_mtx); + + malloc_mutex_unlock(&base_mtx); + + for (i = 0; i < narenas; i++) { + if (arenas[i] != NULL) + malloc_spin_unlock(&arenas[i]->lock); + } + malloc_spin_unlock(&arenas_lock); +} + +/* + * End library-private functions. + */ +/******************************************************************************/ + +#ifdef HAVE_DLOPEN +# include <dlfcn.h> +#endif + +#if defined(MOZ_MEMORY_DARWIN) + +#if !defined(MOZ_REPLACE_MALLOC) +static void * +zone_malloc(malloc_zone_t *zone, size_t size) +{ + + return (malloc_impl(size)); +} + +static void * +zone_calloc(malloc_zone_t *zone, size_t num, size_t size) +{ + + return (calloc_impl(num, size)); +} + +static void * +zone_valloc(malloc_zone_t *zone, size_t size) +{ + void *ret = NULL; /* Assignment avoids useless compiler warning. */ + + posix_memalign_impl(&ret, pagesize, size); + + return (ret); +} + +static void * +zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size) +{ + return (memalign_impl(alignment, size)); +} + +static void * +zone_destroy(malloc_zone_t *zone) +{ + + /* This function should never be called. */ + assert(false); + return (NULL); +} + +static size_t +zone_good_size(malloc_zone_t *zone, size_t size) +{ + return malloc_good_size_impl(size); +} + +static size_t +ozone_size(malloc_zone_t *zone, void *ptr) +{ + size_t ret = isalloc_validate(ptr); + if (ret == 0) + ret = szone->size(zone, ptr); + + return ret; +} + +static void +ozone_free(malloc_zone_t *zone, void *ptr) +{ + if (isalloc_validate(ptr) != 0) + free_impl(ptr); + else { + size_t size = szone->size(zone, ptr); + if (size != 0) + (szone->free)(zone, ptr); + /* Otherwise we leak. */ + } +} + +static void * +ozone_realloc(malloc_zone_t *zone, void *ptr, size_t size) +{ + size_t oldsize; + if (ptr == NULL) + return (malloc_impl(size)); + + oldsize = isalloc_validate(ptr); + if (oldsize != 0) + return (realloc_impl(ptr, size)); + else { + oldsize = szone->size(zone, ptr); + if (oldsize == 0) + return (malloc_impl(size)); + else { + void *ret = malloc_impl(size); + if (ret != NULL) { + memcpy(ret, ptr, (oldsize < size) ? oldsize : + size); + (szone->free)(zone, ptr); + } + return (ret); + } + } +} + +static unsigned +ozone_batch_malloc(malloc_zone_t *zone, size_t size, void **results, + unsigned num_requested) +{ + /* Don't bother implementing this interface, since it isn't required. */ + return 0; +} + +static void +ozone_batch_free(malloc_zone_t *zone, void **to_be_freed, unsigned num) +{ + unsigned i; + + for (i = 0; i < num; i++) + ozone_free(zone, to_be_freed[i]); +} + +static void +ozone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size) +{ + if (isalloc_validate(ptr) != 0) { + assert(isalloc_validate(ptr) == size); + free_impl(ptr); + } else { + assert(size == szone->size(zone, ptr)); + l_szone.m16(zone, ptr, size); + } +} + +static void +ozone_force_lock(malloc_zone_t *zone) +{ + _malloc_prefork(); + szone->introspect->force_lock(zone); +} + +static void +ozone_force_unlock(malloc_zone_t *zone) +{ + szone->introspect->force_unlock(zone); + _malloc_postfork(); +} + +static size_t +zone_version_size(int version) +{ + switch (version) + { + case SNOW_LEOPARD_MALLOC_ZONE_T_VERSION: + return sizeof(snow_leopard_malloc_zone); + case LEOPARD_MALLOC_ZONE_T_VERSION: + return sizeof(leopard_malloc_zone); + default: + case LION_MALLOC_ZONE_T_VERSION: + return sizeof(lion_malloc_zone); + } +} + +/* + * Overlay the default scalable zone (szone) such that existing allocations are + * drained, and further allocations come from jemalloc. This is necessary + * because Core Foundation directly accesses and uses the szone before the + * jemalloc library is even loaded. + */ +static void +szone2ozone(malloc_zone_t *default_zone, size_t size) +{ + lion_malloc_zone *l_zone; + assert(malloc_initialized); + + /* + * Stash a copy of the original szone so that we can call its + * functions as needed. Note that internally, the szone stores its + * bookkeeping data structures immediately following the malloc_zone_t + * header, so when calling szone functions, we need to pass a pointer to + * the original zone structure. + */ + memcpy(szone, default_zone, size); + + /* OSX 10.7 allocates the default zone in protected memory. */ + if (default_zone->version >= LION_MALLOC_ZONE_T_VERSION) { + void* start_of_page = (void*)((size_t)(default_zone) & ~pagesize_mask); + mprotect (start_of_page, size, PROT_READ | PROT_WRITE); + } + + default_zone->size = (void *)ozone_size; + default_zone->malloc = (void *)zone_malloc; + default_zone->calloc = (void *)zone_calloc; + default_zone->valloc = (void *)zone_valloc; + default_zone->free = (void *)ozone_free; + default_zone->realloc = (void *)ozone_realloc; + default_zone->destroy = (void *)zone_destroy; + default_zone->batch_malloc = NULL; + default_zone->batch_free = ozone_batch_free; + default_zone->introspect = ozone_introspect; + + /* Don't modify default_zone->zone_name; Mac libc may rely on the name + * being unchanged. See Mozilla bug 694896. */ + + ozone_introspect->enumerator = NULL; + ozone_introspect->good_size = (void *)zone_good_size; + ozone_introspect->check = NULL; + ozone_introspect->print = NULL; + ozone_introspect->log = NULL; + ozone_introspect->force_lock = (void *)ozone_force_lock; + ozone_introspect->force_unlock = (void *)ozone_force_unlock; + ozone_introspect->statistics = NULL; + + /* Platform-dependent structs */ + l_zone = (lion_malloc_zone*)(default_zone); + + if (default_zone->version >= SNOW_LEOPARD_MALLOC_ZONE_T_VERSION) { + l_zone->m15 = (void (*)())zone_memalign; + l_zone->m16 = (void (*)())ozone_free_definite_size; + l_ozone_introspect.m9 = NULL; + } + + if (default_zone->version >= LION_MALLOC_ZONE_T_VERSION) { + l_zone->m17 = NULL; + l_ozone_introspect.m10 = NULL; + l_ozone_introspect.m11 = NULL; + l_ozone_introspect.m12 = NULL; + l_ozone_introspect.m13 = NULL; + } +} +#endif + +__attribute__((constructor)) +void +jemalloc_darwin_init(void) +{ + if (malloc_init_hard()) + abort(); +} + +#endif + +/* + * is_malloc(malloc_impl) is some macro magic to detect if malloc_impl is + * defined as "malloc" in mozmemory_wrap.h + */ +#define malloc_is_malloc 1 +#define is_malloc_(a) malloc_is_ ## a +#define is_malloc(a) is_malloc_(a) + +#if !defined(MOZ_MEMORY_DARWIN) && (is_malloc(malloc_impl) == 1) +# if defined(__GLIBC__) && !defined(__UCLIBC__) +/* + * glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible + * to inconsistently reference libc's malloc(3)-compatible functions + * (bug 493541). + * + * These definitions interpose hooks in glibc. The functions are actually + * passed an extra argument for the caller return address, which will be + * ignored. + */ +MOZ_MEMORY_API void (*__free_hook)(void *ptr) = free_impl; +MOZ_MEMORY_API void *(*__malloc_hook)(size_t size) = malloc_impl; +MOZ_MEMORY_API void *(*__realloc_hook)(void *ptr, size_t size) = realloc_impl; +MOZ_MEMORY_API void *(*__memalign_hook)(size_t alignment, size_t size) = MEMALIGN; + +# elif defined(RTLD_DEEPBIND) +/* + * XXX On systems that support RTLD_GROUP or DF_1_GROUP, do their + * implementations permit similar inconsistencies? Should STV_SINGLETON + * visibility be used for interposition where available? + */ +# error "Interposing malloc is unsafe on this system without libc malloc hooks." +# endif +#endif + +#ifdef MOZ_MEMORY_WINDOWS +/* + * In the new style jemalloc integration jemalloc is built as a separate + * shared library. Since we're no longer hooking into the CRT binary, + * we need to initialize the heap at the first opportunity we get. + * DLL_PROCESS_ATTACH in DllMain is that opportunity. + */ +BOOL APIENTRY DllMain(HINSTANCE hModule, + DWORD reason, + LPVOID lpReserved) +{ + switch (reason) { + case DLL_PROCESS_ATTACH: + /* Don't force the system to page DllMain back in every time + * we create/destroy a thread */ + DisableThreadLibraryCalls(hModule); + /* Initialize the heap */ + malloc_init_hard(); + break; + + case DLL_PROCESS_DETACH: + break; + + } + + return TRUE; +} +#endif |