ef8897b4b9
When tiny size class support was first added, it was intended to support truly tiny size classes (even 2 bytes). However, this wasn't very useful in practice, so the minimum tiny size class has been limited to sizeof(void *) for a long time now. This is too small to be standards compliant, but other commonly used malloc implementations do not even bother using a 16-byte quantum on systems with vector units (SSE2+, AltiVEC, etc.). As such, it is safe in practice to support an 8-byte tiny size class on 64-bit systems that support 16-byte types.
161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
#ifndef JEMALLOC_DEFS_H_
|
|
#define JEMALLOC_DEFS_H_
|
|
|
|
/*
|
|
* If JEMALLOC_PREFIX is defined, it will cause all public APIs to be prefixed.
|
|
* This makes it possible, with some care, to use multiple allocators
|
|
* simultaneously.
|
|
*
|
|
* In many cases it is more convenient to manually prefix allocator function
|
|
* calls than to let macros do it automatically, particularly when using
|
|
* multiple allocators simultaneously. Define JEMALLOC_MANGLE before
|
|
* #include'ing jemalloc.h in order to cause name mangling that corresponds to
|
|
* the API prefixing.
|
|
*/
|
|
#undef JEMALLOC_PREFIX
|
|
#undef JEMALLOC_CPREFIX
|
|
#if (defined(JEMALLOC_PREFIX) && defined(JEMALLOC_MANGLE))
|
|
#undef JEMALLOC_P
|
|
#endif
|
|
|
|
/*
|
|
* JEMALLOC_PRIVATE_NAMESPACE is used as a prefix for all library-private APIs.
|
|
* For shared libraries, symbol visibility mechanisms prevent these symbols
|
|
* from being exported, but for static libraries, naming collisions are a real
|
|
* possibility.
|
|
*/
|
|
#undef JEMALLOC_PRIVATE_NAMESPACE
|
|
#undef JEMALLOC_N
|
|
|
|
/*
|
|
* Hyper-threaded CPUs may need a special instruction inside spin loops in
|
|
* order to yield to another virtual CPU.
|
|
*/
|
|
#undef CPU_SPINWAIT
|
|
|
|
/*
|
|
* Defined if OSAtomic*() functions are available, as provided by Darwin, and
|
|
* documented in the atomic(3) manual page.
|
|
*/
|
|
#undef JEMALLOC_OSATOMIC
|
|
|
|
/*
|
|
* Defined if OSSpin*() functions are available, as provided by Darwin, and
|
|
* documented in the spinlock(3) manual page.
|
|
*/
|
|
#undef JEMALLOC_OSSPIN
|
|
|
|
/* Defined if __attribute__((...)) syntax is supported. */
|
|
#undef JEMALLOC_HAVE_ATTR
|
|
#ifdef JEMALLOC_HAVE_ATTR
|
|
# define JEMALLOC_CATTR(s, a) __attribute__((s))
|
|
# define JEMALLOC_ATTR(s) JEMALLOC_CATTR(s,)
|
|
#else
|
|
# define JEMALLOC_CATTR(s, a) a
|
|
# define JEMALLOC_ATTR(s) JEMALLOC_CATTR(s,)
|
|
#endif
|
|
|
|
/* JEMALLOC_CC_SILENCE enables code that silences unuseful compiler warnings. */
|
|
#undef JEMALLOC_CC_SILENCE
|
|
|
|
/*
|
|
* JEMALLOC_DEBUG enables assertions and other sanity checks, and disables
|
|
* inline functions.
|
|
*/
|
|
#undef JEMALLOC_DEBUG
|
|
|
|
/* JEMALLOC_STATS enables statistics calculation. */
|
|
#undef JEMALLOC_STATS
|
|
|
|
/* JEMALLOC_PROF enables allocation profiling. */
|
|
#undef JEMALLOC_PROF
|
|
|
|
/* Use libunwind for profile backtracing if defined. */
|
|
#undef JEMALLOC_PROF_LIBUNWIND
|
|
|
|
/* Use libgcc for profile backtracing if defined. */
|
|
#undef JEMALLOC_PROF_LIBGCC
|
|
|
|
/* Use gcc intrinsics for profile backtracing if defined. */
|
|
#undef JEMALLOC_PROF_GCC
|
|
|
|
/*
|
|
* JEMALLOC_TCACHE enables a thread-specific caching layer for small objects.
|
|
* This makes it possible to allocate/deallocate objects without any locking
|
|
* when the cache is in the steady state.
|
|
*/
|
|
#undef JEMALLOC_TCACHE
|
|
|
|
/*
|
|
* JEMALLOC_DSS enables use of sbrk(2) to allocate chunks from the data storage
|
|
* segment (DSS).
|
|
*/
|
|
#undef JEMALLOC_DSS
|
|
|
|
/* Support memory filling (junk/zero). */
|
|
#undef JEMALLOC_FILL
|
|
|
|
/* Support optional abort() on OOM. */
|
|
#undef JEMALLOC_XMALLOC
|
|
|
|
/* Support SYSV semantics. */
|
|
#undef JEMALLOC_SYSV
|
|
|
|
/* Support lazy locking (avoid locking unless a second thread is launched). */
|
|
#undef JEMALLOC_LAZY_LOCK
|
|
|
|
/* Determine page size at run time if defined. */
|
|
#undef DYNAMIC_PAGE_SHIFT
|
|
|
|
/* One page is 2^STATIC_PAGE_SHIFT bytes. */
|
|
#undef STATIC_PAGE_SHIFT
|
|
|
|
/* TLS is used to map arenas and magazine caches to threads. */
|
|
#undef NO_TLS
|
|
|
|
/*
|
|
* JEMALLOC_IVSALLOC enables ivsalloc(), which verifies that pointers reside
|
|
* within jemalloc-owned chunks before dereferencing them.
|
|
*/
|
|
#undef JEMALLOC_IVSALLOC
|
|
|
|
/*
|
|
* Define overrides for non-standard allocator-related functions if they
|
|
* are present on the system.
|
|
*/
|
|
#undef JEMALLOC_OVERRIDE_MEMALIGN
|
|
#undef JEMALLOC_OVERRIDE_VALLOC
|
|
|
|
/*
|
|
* Darwin (OS X) uses zones to work around Mach-O symbol override shortcomings.
|
|
*/
|
|
#undef JEMALLOC_ZONE
|
|
#undef JEMALLOC_ZONE_VERSION
|
|
|
|
/* If defined, use mremap(...MREMAP_FIXED...) for huge realloc(). */
|
|
#undef JEMALLOC_MREMAP_FIXED
|
|
|
|
/*
|
|
* Methods for purging unused pages differ between operating systems.
|
|
*
|
|
* madvise(..., MADV_DONTNEED) : On Linux, this immediately discards pages,
|
|
* such that new pages will be demand-zeroed if
|
|
* the address region is later touched.
|
|
* madvise(..., MADV_FREE) : On FreeBSD and Darwin, this marks pages as being
|
|
* unused, such that they will be discarded rather
|
|
* than swapped out.
|
|
*/
|
|
#undef JEMALLOC_PURGE_MADVISE_DONTNEED
|
|
#undef JEMALLOC_PURGE_MADVISE_FREE
|
|
|
|
/* sizeof(void *) == 2^LG_SIZEOF_PTR. */
|
|
#undef LG_SIZEOF_PTR
|
|
|
|
/* sizeof(int) == 2^LG_SIZEOF_INT. */
|
|
#undef LG_SIZEOF_INT
|
|
|
|
/* sizeof(long) == 2^LG_SIZEOF_LONG. */
|
|
#undef LG_SIZEOF_LONG
|
|
|
|
#endif /* JEMALLOC_DEFS_H_ */
|