-/* Copyright (c) 2010-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2010-2023. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
/* Redefine the classical malloc/free/realloc functions so that they fit well in the mmalloc framework */
#define _GNU_SOURCE
-#include <stdlib.h>
-
-#include <dlfcn.h>
-
-#include "src/mc/mc_base.h"
#include "mmprivate.h"
-#include "src/xbt_modinter.h"
-#include "src/internal_config.h"
+#include "src/mc/mc_environ.h" // MC_ENV_SOCKET_FD
+#include <dlfcn.h>
#include <math.h>
-#include "src/mc/mc_protocol.h"
+#include <stdlib.h>
-/* ***** Whether to use `mmalloc` of the undrlying malloc ***** */
+/* ***** Whether to use `mmalloc` of the underlying malloc ***** */
static int __malloc_use_mmalloc;
return __mmalloc_current_heap;
}
-xbt_mheap_t mmalloc_set_current_heap(xbt_mheap_t new_heap)
-{
- xbt_mheap_t heap = __mmalloc_current_heap;
- __mmalloc_current_heap = new_heap;
- return heap;
-}
-
-#ifdef MMALLOC_WANT_OVERRIDE_LEGACY
-
+/* Override the malloc-like functions if MC is activated at compile time */
/* ***** Temporary allocator
*
* This is used before we have found the real malloc implementation with dlsym.
*/
-#define BUFFER_SIZE 32
static size_t fake_alloc_index;
-static uint64_t buffer[BUFFER_SIZE];
+static uint64_t buffer[mmalloc_preinit_buffer_size];
+uint64_t* mmalloc_preinit_buffer = buffer;
/* Fake implementations, they are used to fool dlsym:
* dlsym used calloc and falls back to some other mechanism
*/
static void* mm_fake_malloc(size_t n)
{
+ mmalloc_preinit_buffer = buffer;
+
// How many uint64_t do w need?
size_t count = n / sizeof(uint64_t);
if (n % sizeof(uint64_t))
count++;
- // Check that we have enough availabel memory:
- if (fake_alloc_index + count >= BUFFER_SIZE)
+ // Check that we have enough available memory:
+ if (fake_alloc_index + count >= mmalloc_preinit_buffer_size) {
+ puts("mmalloc is not initialized yet, but the static buffer used as malloc replacement is already exhausted. "
+ "Please increase `mmalloc_preinit_buffer_size` in mm_legacy.c\n");
exit(127);
+ }
// Allocate it:
uint64_t* res = buffer + fake_alloc_index;
fake_alloc_index += count;
return mm_fake_malloc(n);
}
-static void* mm_fake_realloc(void *p, size_t s)
+static void* mm_fake_realloc(XBT_ATTRIB_UNUSED void* p, size_t s)
{
return mm_fake_malloc(s);
}
-static void mm_fake_free(void *p)
+static void mm_fake_free(XBT_ATTRIB_UNUSED void* p)
{
+ // Nothing to do
}
/* Function signatures for the main malloc functions: */
/** Constructor functions used to initialize the malloc implementation
*/
-static void __attribute__((constructor(101))) mm_legacy_constructor()
+XBT_ATTRIB_CONSTRUCTOR(101) static void mm_legacy_constructor()
{
if (mm_initialized)
return;
mm_initializing = 1;
- __malloc_use_mmalloc = getenv(MC_ENV_VARIABLE) ? 1 : 0;
+ __malloc_use_mmalloc = getenv(MC_ENV_SOCKET_FD) != NULL;
if (__malloc_use_mmalloc) {
__mmalloc_current_heap = mmalloc_preinit();
} else {
+#if HAVE_DLFUNC
+ mm_real_realloc = (void *(*)(void *, size_t))dlfunc(RTLD_NEXT, "realloc");
+ mm_real_malloc = (void *(*)(size_t))dlfunc(RTLD_NEXT, "malloc");
+ mm_real_free = (void (*)(void *))dlfunc(RTLD_NEXT, "free");
+ mm_real_calloc = (void *(*)(size_t, size_t))dlfunc(RTLD_NEXT, "calloc");
+#else
mm_real_realloc = dlsym(RTLD_NEXT, "realloc");
mm_real_malloc = dlsym(RTLD_NEXT, "malloc");
mm_real_free = dlsym(RTLD_NEXT, "free");
mm_real_calloc = dlsym(RTLD_NEXT, "calloc");
+#endif
}
+
mm_initializing = 0;
mm_initialized = 1;
}
#define GET_HEAP() __mmalloc_current_heap
-void* malloc_no_memset(size_t n)
-{
- if (!mm_initialized) {
- if (mm_initializing)
- return mm_fake_malloc(n);
- mm_legacy_constructor();
- }
-
- if (!__malloc_use_mmalloc) {
- return mm_real_malloc(n);
- }
-
- xbt_mheap_t mdp = GET_HEAP();
- if (!mdp)
- return NULL;
-
- LOCK(mdp);
- void *ret = mmalloc_no_memset(mdp, n);
- UNLOCK(mdp);
- return ret;
-}
-
void *malloc(size_t n)
{
if (!mm_initialized) {
if (!mdp)
return NULL;
- LOCK(mdp);
- void *ret = mmalloc(mdp, n);
- UNLOCK(mdp);
- return ret;
+ return mmalloc(mdp, n);
}
void *calloc(size_t nmemb, size_t size)
if (!mdp)
return NULL;
- LOCK(mdp);
void *ret = mmalloc(mdp, nmemb*size);
- UNLOCK(mdp);
// This was already done in the callee:
if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) {
memset(ret, 0, nmemb * size);
if (!mdp)
return NULL;
- LOCK(mdp);
- void* ret = mrealloc(mdp, p, s);
- UNLOCK(mdp);
- return ret;
+ return mrealloc(mdp, p, s);
}
void free(void *p)
return;
xbt_mheap_t mdp = GET_HEAP();
- LOCK(mdp);
mfree(mdp, p);
- UNLOCK(mdp);
}
-#endif /* WANT_MALLOC_OVERRIDE */
