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Test for availability of malloc hooks via autoconf

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__*_hook() is glibc, but on at least one glibc platform (homebrew),
the __GLIBC__ define isn't set correctly and we miss being able to
use these hooks.

Do a feature test for it during configuration so that we enable it
anywhere the hooks are actually available.
This commit is contained in:
Sara Golemon 2014-08-18 13:06:39 -07:00 committed by Jason Evans
parent 602c8e0971
commit 3e24afa28e
3 changed files with 40 additions and 1 deletions
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31
configure.ac
View File

@ -1340,6 +1340,37 @@ if test "x${enable_zone_allocator}" = "x1" ; then
AC_DEFINE_UNQUOTED(JEMALLOC_ZONE_VERSION, [$JEMALLOC_ZONE_VERSION])
fi
dnl ============================================================================
dnl Check for glibc malloc hooks
JE_COMPILABLE([glibc malloc hook], [
#include <stddef.h>
extern void (* __free_hook)(void *ptr);
extern void *(* __malloc_hook)(size_t size);
extern void *(* __realloc_hook)(void *ptr, size_t size);
], [
void *ptr = 0L;
if (__malloc_hook) ptr = __malloc_hook(1);
if (__realloc_hook) ptr = __realloc_hook(ptr, 2);
if (__free_hook && ptr) __free_hook(ptr);
], [je_cv_glibc_malloc_hook])
if test "x${je_cv_glibc_malloc_hook}" = "xyes" ; then
AC_DEFINE([JEMALLOC_GLIBC_MALLOC_HOOK], [ ])
fi
JE_COMPILABLE([glibc memalign hook], [
#include <stddef.h>
extern void *(* __memalign_hook)(size_t alignment, size_t size);
], [
void *ptr = 0L;
if (__memalign_hook) ptr = __memalign_hook(16, 7);
], [je_cv_glibc_memalign_hook])
if test "x${je_cv_glibc_memalign_hook}" = "xyes" ; then
AC_DEFINE([JEMALLOC_GLIBC_MEMALIGN_HOOK], [ ])
fi
dnl ============================================================================
dnl Check for typedefs, structures, and compiler characteristics.
AC_HEADER_STDBOOL

6
include/jemalloc/internal/jemalloc_internal_defs.h.in
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@ -209,4 +209,10 @@
/* sizeof(intmax_t) == 2^LG_SIZEOF_INTMAX_T. */
#undef LG_SIZEOF_INTMAX_T
/* glibc malloc hooks (__malloc_hook, __realloc_hook, __free_hook) */
#undef JEMALLOC_GLIBC_MALLOC_HOOK
/* glibc memalign hook */
#undef JEMALLOC_GLIBC_MEMALIGN_HOOK
#endif /* JEMALLOC_INTERNAL_DEFS_H_ */

4
src/jemalloc.c
View File

@ -1336,7 +1336,7 @@ je_valloc(size_t size)
#define is_malloc_(a) malloc_is_ ## a
#define is_malloc(a) is_malloc_(a)
#if ((is_malloc(je_malloc) == 1) && defined(__GLIBC__) && !defined(__UCLIBC__))
#if ((is_malloc(je_malloc) == 1) && defined(JEMALLOC_GLIBC_MALLOC_HOOK))
/*
* glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible
* to inconsistently reference libc's malloc(3)-compatible functions
@ -1349,9 +1349,11 @@ je_valloc(size_t size)
JEMALLOC_EXPORT void (*__free_hook)(void *ptr) = je_free;
JEMALLOC_EXPORT void *(*__malloc_hook)(size_t size) = je_malloc;
JEMALLOC_EXPORT void *(*__realloc_hook)(void *ptr, size_t size) = je_realloc;
# ifdef JEMALLOC_GLIBC_MEMALIGN_HOOK
JEMALLOC_EXPORT void *(*__memalign_hook)(size_t alignment, size_t size) =
je_memalign;
# endif
#endif
/*
* End non-standard override functions.