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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2004-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_mtrace.h"
#ifdef ERTS_CAN_TRACK_MALLOC
#if defined(HAVE_END_SYMBOL)
extern char end;
#elif defined(HAVE__END_SYMBOL)
extern char _end;
#endif
static int inited = 0;
static int init(void);
static volatile char *heap_start = NULL;
static volatile char *heap_end = NULL;
#if defined(ERTS___AFTER_MORECORE_HOOK_CAN_TRACK_MALLOC) /* ----------------- */
#ifdef HAVE_MALLOC_H
# include <malloc.h>
#endif
#undef SBRK_0
#define SBRK_0 sbrk(0)
static void
init_hook(void)
{
__after_morecore_hook = erts_mtrace_update_heap_size;
if (inited)
return;
heap_end = NULL;
#if defined(HAVE_END_SYMBOL)
heap_start = &end;
#elif defined(HAVE__END_SYMBOL)
heap_start = &_end;
#else
heap_start = SBRK_0;
if (heap_start == (SBRK_RET_TYPE) -1) {
heap_start = NULL;
return;
}
#endif
inited = 1;
}
static int
init(void)
{
init_hook();
return inited;
}
void (*__malloc_initialize_hook)(void) = init_hook;
#elif defined(ERTS_BRK_WRAPPERS_CAN_TRACK_MALLOC) /* ------------------------ */
#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif
#undef SBRK_0
#define SBRK_0 (*real_sbrk)(0)
#ifndef HAVE_SBRK
# error no sbrk()
#endif
#if !defined(HAVE_END_SYMBOL) && !defined(HAVE__END_SYMBOL)
# error no 'end' nor '_end'
#endif
static void update_heap_size(char *new_end);
#define SBRK_IMPL(RET_TYPE, FUNC, ARG_TYPE) \
RET_TYPE FUNC (ARG_TYPE); \
static RET_TYPE (*real_ ## FUNC)(ARG_TYPE) = NULL; \
RET_TYPE FUNC (ARG_TYPE arg) \
{ \
RET_TYPE res; \
if (!inited && !init()) \
return (RET_TYPE) -1; \
res = (*real_ ## FUNC)(arg); \
if (erts_mtrace_enabled && res != ((RET_TYPE) -1)) \
update_heap_size((char *) (*real_ ## FUNC)(0)); \
return res; \
}
#define BRK_IMPL(RET_TYPE, FUNC, ARG_TYPE) \
RET_TYPE FUNC (ARG_TYPE); \
static RET_TYPE (*real_ ## FUNC)(ARG_TYPE) = NULL; \
RET_TYPE FUNC (ARG_TYPE arg) \
{ \
RET_TYPE res; \
if (!inited && !init()) \
return (RET_TYPE) -1; \
res = (*real_ ## FUNC)(arg); \
if (erts_mtrace_enabled && res != ((RET_TYPE) -1)) \
update_heap_size((char *) arg); \
return res; \
}
SBRK_IMPL(SBRK_RET_TYPE, sbrk, SBRK_ARG_TYPE)
#ifdef HAVE_BRK
BRK_IMPL(BRK_RET_TYPE, brk, BRK_ARG_TYPE)
#endif
#ifdef HAVE__SBRK
SBRK_IMPL(SBRK_RET_TYPE, _sbrk, SBRK_ARG_TYPE)
#endif
#ifdef HAVE__BRK
BRK_IMPL(BRK_RET_TYPE, _brk, BRK_ARG_TYPE)
#endif
#ifdef HAVE___SBRK
SBRK_IMPL(SBRK_RET_TYPE, __sbrk, SBRK_ARG_TYPE)
#endif
#ifdef HAVE___BRK
BRK_IMPL(BRK_RET_TYPE, __brk, BRK_ARG_TYPE)
#endif
static int
init(void)
{
if (inited)
return 1;
#define INIT_XBRK_SYM(SYM) \
do { \
if (!real_ ## SYM) { \
real_ ## SYM = dlsym(RTLD_NEXT, #SYM); \
if (!real_ ## SYM) { \
errno = ENOMEM; \
return 0; \
} \
} \
} while (0)
heap_end = NULL;
#if defined(HAVE_END_SYMBOL)
heap_start = &end;
#elif defined(HAVE__END_SYMBOL)
heap_start = &_end;
#endif
INIT_XBRK_SYM(sbrk);
#ifdef HAVE_BRK
INIT_XBRK_SYM(brk);
#endif
#ifdef HAVE__SBRK
INIT_XBRK_SYM(_sbrk);
#endif
#ifdef HAVE__BRK
INIT_XBRK_SYM(_brk);
#endif
#ifdef HAVE___SBRK
INIT_XBRK_SYM(__sbrk);
#endif
#ifdef HAVE___BRK
INIT_XBRK_SYM(__brk);
#endif
return inited = 1;
#undef INIT_XBRK_SYM
}
#endif /* #elif defined(ERTS_BRK_WRAPPERS_CAN_TRACK_MALLOC) */ /* ----------- */
static void
update_heap_size(char *new_end)
{
volatile char *new_start, *old_start, *old_end;
Uint size;
if (new_end == ((char *) -1))
return;
new_start = (old_start = heap_start);
old_end = heap_end;
heap_end = new_end;
if (new_end < old_start || !old_start)
heap_start = (new_start = new_end);
size = (Uint) (new_end - new_start);
if (!old_end) {
if (size)
erts_mtrace_crr_alloc((void *) new_start,
ERTS_ALC_A_SYSTEM,
ERTS_MTRACE_SEGMENT_ID,
size);
else
heap_end = NULL;
}
else {
if (old_end != new_end || old_start != new_start) {
if (size)
erts_mtrace_crr_realloc((void *) new_start,
ERTS_ALC_A_SYSTEM,
ERTS_MTRACE_SEGMENT_ID,
(void *) old_start,
size);
else {
if (old_start)
erts_mtrace_crr_free(ERTS_ALC_A_SYSTEM,
ERTS_MTRACE_SEGMENT_ID,
(void *) old_start);
heap_end = NULL;
}
}
}
}
#endif /* #ifdef ERTS_CAN_TRACK_MALLOC */
void
erts_mtrace_update_heap_size(void)
{
#ifdef ERTS_CAN_TRACK_MALLOC
if (erts_mtrace_enabled && (inited || init()))
update_heap_size((char *) SBRK_0);
#endif
}
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