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Merge branch '2529-add-__attribute__-malloc-for-isc_mempool_get' into 'main'

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Resolve "Add __attribute__((malloc)) for isc_mempool_get"

Closes #2529

See merge request isc-projects/bind9!4858
This commit is contained in:
Diego dos Santos Fronza
2021-04-26 14:50:15 +00:00
parent 19df09d225 54aa60eef8
commit 99a4f6119a
4 changed files with 128 additions and 13 deletions
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28
configure.ac
View File

@@ -422,6 +422,34 @@ AC_COMPILE_IFELSE(
#
AX_GCC_FUNC_ATTRIBUTE([noreturn])
#
# check for GCC malloc attribute
#
AX_GCC_FUNC_ATTRIBUTE([malloc])
AC_MSG_CHECKING([for extended malloc attributes])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#include <stddef.h>
#include <stdlib.h>
__attribute__ ((malloc, malloc (free, 1))
void * xmalloc(size_t sz) { return malloc(sz); }
]],
[[
void *p = xmalloc(8);
free(p);
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_MALLOC_EXT_ATTR], [1], [define if extended attributes for malloc are available])
],
[AC_MSG_RESULT(no)])
#
# check for GCC returns_nonnull attribute
#
AX_GCC_FUNC_ATTRIBUTE([returns_nonnull])
#
# check if we have kqueue
#

60
lib/isc/include/isc/attributes.h
View File

@@ -24,3 +24,63 @@
#else
#define ISC_NORETURN
#endif
#if HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL
#define ISC_ATTR_RETURNS_NONNULL __attribute__((returns_nonnull))
#else
#define ISC_ATTR_RETURNS_NONNULL
#endif
#ifdef HAVE_FUNC_ATTRIBUTE_MALLOC
/*
* Indicates that a function is malloc-like, i.e., that the
* pointer P returned by the function cannot alias any other
* pointer valid when the function returns.
*/
#define ISC_ATTR_MALLOC __attribute__((malloc))
#if HAVE_MALLOC_EXT_ATTR
/*
* Associates deallocator as a suitable deallocation function
* for pointers returned from the function marked with the attribute.
*/
#define ISC_ATTR_DEALLOCATOR(deallocator) __attribute__((malloc(deallocator)))
/*
* Similar to ISC_ATTR_DEALLOCATOR, but allows to speficy an index "idx",
* which denotes the positional argument to which when the pointer is passed
* in calls to deallocator has the effect of deallocating it.
*/
#define ISC_ATTR_DEALLOCATOR_IDX(deallocator, idx) \
__attribute__((malloc(deallocator, idx)))
/*
* Combines both ISC_ATTR_MALLOC and ISC_ATTR_DEALLOCATOR attributes.
*/
#define ISC_ATTR_MALLOC_DEALLOCATOR(deallocator) \
__attribute__((malloc, malloc(deallocator)))
/*
* Similar to ISC_ATTR_MALLOC_DEALLOCATOR, but allows to speficy an index "idx",
* which denotes the positional argument to which when the pointer is passed
* in calls to deallocator has the effect of deallocating it.
*/
#define ISC_ATTR_MALLOC_DEALLOCATOR_IDX(deallocator, idx) \
__attribute__((malloc, malloc(deallocator, idx)))
#else /* #ifdef HAVE_MALLOC_EXT_ATTR */
/*
* There is support for malloc attribute but not for
* extended attributes, so macros that combine attribute malloc
* with a deallocator will only expand to malloc attribute.
*/
#define ISC_ATTR_DEALLOCATOR(deallocator)
#define ISC_ATTR_DEALLOCATOR_IDX(deallocator, idx)
#define ISC_ATTR_MALLOC_DEALLOCATOR(deallocator) ISC_ATTR_MALLOC
#define ISC_ATTR_MALLOC_DEALLOCATOR_IDX(deallocator, idx) ISC_ATTR_MALLOC
#endif
#else /* #ifdef HAVE_FUNC_ATTRIBUTE_MALLOC */
/*
* There is no support for malloc attribute.
*/
#define ISC_ATTR_MALLOC
#define ISC_ATTR_DEALLOCATOR(deallocator)
#define ISC_ATTR_DEALLOCATOR_IDX(deallocator, idx)
#define ISC_ATTR_MALLOC_DEALLOCATOR(deallocator)
#define ISC_ATTR_MALLOC_DEALLOCATOR_IDX(deallocator, idx)
#endif /* HAVE_FUNC_ATTRIBUTE_MALLOC */

44
lib/isc/include/isc/mem.h
View File

@@ -17,6 +17,7 @@
#include <stdbool.h>
#include <stdio.h>
#include <isc/attributes.h>
#include <isc/lang.h>
#include <isc/mutex.h>
#include <isc/platform.h>
@@ -508,19 +509,54 @@ isc_mempool_setfillcount(isc_mempool_t *mpctx, unsigned int limit);
*\li limit > 0
*/
#if defined(UNIT_TESTING) && defined(malloc)
/*
* cmocka.h redefined malloc as a macro, we #undef it
* to avoid replacing ISC_ATTR_MALLOC with garbage.
*/
#pragma push_macro("malloc")
#undef malloc
#define POP_MALLOC_MACRO 1
#endif
/*
* Pseudo-private functions for use via macros. Do not call directly.
*/
void ISCMEMFUNC(putanddetach)(isc_mem_t **, void *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(put)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(free)(isc_mem_t *, void *_ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMFUNC(put), 2)
void *ISCMEMFUNC(get)(isc_mem_t *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(putanddetach)(isc_mem_t **, void *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(put)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMFUNC(free), 2)
void *ISCMEMFUNC(allocate)(isc_mem_t *, size_t _ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_DEALLOCATOR_IDX(ISCMEMFUNC(free), 2)
void *ISCMEMFUNC(reallocate)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(free)(isc_mem_t *, void *_ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMFUNC(free), 2)
char *ISCMEMFUNC(strdup)(isc_mem_t *, const char *_ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMFUNC(free), 2)
char *ISCMEMFUNC(strndup)(isc_mem_t *, const char *, size_t _ISC_MEM_FLARG);
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMPOOLFUNC(put), 2)
void *ISCMEMPOOLFUNC(get)(isc_mempool_t *_ISC_MEM_FLARG);
void ISCMEMPOOLFUNC(put)(isc_mempool_t *, void *_ISC_MEM_FLARG);
void ISCMEMPOOLFUNC(put)(isc_mempool_t *, void *_ISC_MEM_FLARG);
#ifdef POP_MALLOC_MACRO
/*
* Restore cmocka.h macro for malloc.
*/
#pragma pop_macro("malloc")
#endif
ISC_LANG_ENDDECLS

9
lib/isc/mem.c
View File

@@ -1366,15 +1366,7 @@ isc__mempool_get(isc_mempool_t *mpctx FLARG) {
}
}
/*
* If we didn't get any items, return NULL.
*/
item = mpctx->items;
if (ISC_UNLIKELY(item == NULL)) {
atomic_fetch_sub_release(&mpctx->allocated, 1);
goto out;
}
mpctx->items = item->next;
INSIST(atomic_fetch_sub_release(&mpctx->freecount, 1) > 0);
@@ -1382,7 +1374,6 @@ isc__mempool_get(isc_mempool_t *mpctx FLARG) {
ADD_TRACE(mpctx->mctx, item, mpctx->size, file, line);
out:
MPCTXUNLOCK(mpctx);
return (item);