mirror of https://github.com/facebook/rocksdb.git
78 lines
3.4 KiB
C
78 lines
3.4 KiB
C
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#if defined(__clang__)
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// glibc's `posix_memalign()` declaration specifies `throw()` while clang's
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// declaration does not. There is a hack in clang to make its re-declaration
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// compatible with glibc's if they are declared consecutively. That hack breaks
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// if yet another `posix_memalign()` declaration comes between glibc's and
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// clang's declarations. Include "mm_malloc.h" here ensures glibc's and clang's
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// declarations both come before "jemalloc.h"'s `posix_memalign()` declaration.
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//
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// This problem could also be avoided if "jemalloc.h"'s `posix_memalign()`
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// declaration did not specify `throw()` when built with clang.
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#include <mm_malloc.h>
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#endif
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#ifdef ROCKSDB_JEMALLOC
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#ifdef __FreeBSD__
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#include <malloc_np.h>
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#else
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#define JEMALLOC_MANGLE
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#include <jemalloc/jemalloc.h>
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#endif
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#ifndef JEMALLOC_CXX_THROW
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#define JEMALLOC_CXX_THROW
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#endif
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#if defined(OS_WIN) && defined(_MSC_VER)
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// MSVC does not have weak symbol support. As long as ROCKSDB_JEMALLOC is
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// defined, Jemalloc memory allocator is used.
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static inline bool HasJemalloc() { return true; }
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#else
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// Declare non-standard jemalloc APIs as weak symbols. We can null-check these
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// symbols to detect whether jemalloc is linked with the binary.
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extern "C" void* mallocx(size_t, int) __attribute__((__weak__));
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extern "C" void* rallocx(void*, size_t, int) __attribute__((__weak__));
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extern "C" size_t xallocx(void*, size_t, size_t, int) __attribute__((__weak__));
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extern "C" size_t sallocx(const void*, int) __attribute__((__weak__));
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extern "C" void dallocx(void*, int) __attribute__((__weak__));
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extern "C" void sdallocx(void*, size_t, int) __attribute__((__weak__));
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extern "C" size_t nallocx(size_t, int) __attribute__((__weak__));
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extern "C" int mallctl(const char*, void*, size_t*, void*, size_t)
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__attribute__((__weak__));
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extern "C" int mallctlnametomib(const char*, size_t*, size_t*)
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__attribute__((__weak__));
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extern "C" int mallctlbymib(const size_t*, size_t, void*, size_t*, void*,
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size_t) __attribute__((__weak__));
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extern "C" void malloc_stats_print(void (*)(void*, const char*), void*,
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const char*) __attribute__((__weak__));
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extern "C" size_t malloc_usable_size(JEMALLOC_USABLE_SIZE_CONST void*)
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JEMALLOC_CXX_THROW __attribute__((__weak__));
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// Check if Jemalloc is linked with the binary. Note the main program might be
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// using a different memory allocator even this method return true.
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// It is loosely based on folly::usingJEMalloc(), minus the check that actually
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// allocate memory and see if it is through jemalloc, to handle the dlopen()
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// case:
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// https://github.com/facebook/folly/blob/76cf8b5841fb33137cfbf8b224f0226437c855bc/folly/memory/Malloc.h#L147
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static inline bool HasJemalloc() {
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return mallocx != nullptr && rallocx != nullptr && xallocx != nullptr &&
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sallocx != nullptr && dallocx != nullptr && sdallocx != nullptr &&
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nallocx != nullptr && mallctl != nullptr &&
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mallctlnametomib != nullptr && mallctlbymib != nullptr &&
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malloc_stats_print != nullptr && malloc_usable_size != nullptr;
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}
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#endif
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#endif // ROCKSDB_JEMALLOC
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