/* -*- 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 . * Copyright (C) 2015-2018 Mark Straver * * 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 /* * Uncomment this to use only one arena by default. */ // #define MOZ_MEMORY_NARENAS_DEFAULT_ONE /* * 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. */ # define MOZ_MALLOC_OPTIONS "" /* * 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 #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 #include #include #include #include #include #include #ifdef MOZ_MEMORY_WINDOWS /* Some defines from the CRT internal headers that we need here. */ #define _CRT_SPINCOUNT 5000 #define __crtInitCritSecAndSpinCount InitializeCriticalSectionAndSpinCount #include #include #include #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 #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 #ifndef MADV_FREE # define MADV_FREE MADV_DONTNEED #endif #ifndef MAP_NOSYNC # define MAP_NOSYNC 0 #endif #include #ifndef MOZ_MEMORY #include #endif #include #include #if !defined(MOZ_MEMORY_SOLARIS) && !defined(MOZ_MEMORY_ANDROID) #include #endif #include #ifndef MOZ_MEMORY #include /* Must come after several other sys/ includes. */ #include #include #include #endif #include #include #ifndef SIZE_T_MAX # define SIZE_T_MAX SIZE_MAX #endif #include #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 #include #include #include #include #include #include #ifndef MOZ_MEMORY_DARWIN #include #endif #include #ifdef MOZ_MEMORY_DARWIN #include #include #include #include #include #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 #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 #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 #ifdef MOZ_MEMORY_DARWIN # 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 /* * 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 /******************************************************************************/ /* 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; }; #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; /* * 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 static unsigned next_arena; #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; 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); 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 (! __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 _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 _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 (! __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 _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 _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 (_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) { _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_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 (""); } #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 #ifdef MOZ_MEMORY_SOLARIS int err = posix_madvise(addr, length, JEMALLOC_MADV_PURGE); unzeroed = (JEMALLOC_MADV_ZEROS == false || err != 0); #else int err = madvise(addr, length, JEMALLOC_MADV_PURGE); unzeroed = (JEMALLOC_MADV_ZEROS == false || err != 0); #endif # 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 # 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 (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; if (narenas > 1) { 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); } 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 #ifdef MOZ_MEMORY_SOLARIS posix_madvise((void*)((uintptr_t)chunk + (i << pagesize_2pow)), (npages << pagesize_2pow),MADV_FREE); #else madvise((void *)((uintptr_t)chunk + (i << pagesize_2pow)), (npages << pagesize_2pow), MADV_FREE); #endif # 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); } 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); malloc_spin_lock(&arena->lock); 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); malloc_spin_lock(&arena->lock); 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); malloc_spin_lock(&arena->lock); 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. */ malloc_spin_lock(&arena->lock); 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); malloc_spin_lock(&arena->lock); 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); /* 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); } /* * Platform-specific methods to determine the number of CPUs in a system. * This will be used to determine the desired number of arenas. */ #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 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 #include 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); } #elif (defined(MOZ_MEMORY_WINDOWS)) static inline unsigned malloc_ncpus(void) { SYSTEM_INFO info; GetSystemInfo(&info); return (info.dwNumberOfProcessors); } #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 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", ""); _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; 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; 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 /* 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; } #else result = sysconf(_SC_PAGESIZE); assert(result != -1); #endif #ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE ncpus = malloc_ncpus(); #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': case 'B': // Balancing option is ignored 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 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 next_arena = 0; #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 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(": 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 # if (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 = SIZE_T_MAX; 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 #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