+++ /dev/null
-/* 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 "mmprivate.h"
-#include "src/mc/mc_environ.h" // MC_ENV_SOCKET_FD
-#include <dlfcn.h>
-#include <math.h>
-#include <stdlib.h>
-
-/* ***** Whether to use `mmalloc` of the underlying malloc ***** */
-
-static int __malloc_use_mmalloc;
-
-int malloc_use_mmalloc(void)
-{
- return __malloc_use_mmalloc;
-}
-
-/* ***** Current heap ***** */
-
-/* The mmalloc() package can use a single implicit malloc descriptor
- for mmalloc/mrealloc/mfree operations which do not supply an explicit
- descriptor. This allows mmalloc() to provide
- backwards compatibility with the non-mmap'd version. */
-xbt_mheap_t __mmalloc_default_mdp = NULL;
-
-/* The heap we are currently using. */
-static xbt_mheap_t __mmalloc_current_heap = NULL;
-
-xbt_mheap_t mmalloc_get_current_heap(void)
-{
- return __mmalloc_current_heap;
-}
-
-/* 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.
- */
-
-static size_t fake_alloc_index;
-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
- * if this fails.
- */
-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 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 res;
-}
-
-static void* mm_fake_calloc(size_t nmemb, size_t size)
-{
- // This is fresh .bss data, we don't need to clear it:
- size_t n = nmemb * size;
- return mm_fake_malloc(n);
-}
-
-static void* mm_fake_realloc(XBT_ATTRIB_UNUSED void* p, size_t s)
-{
- return mm_fake_malloc(s);
-}
-
-static void mm_fake_free(XBT_ATTRIB_UNUSED void* p)
-{
- // Nothing to do
-}
-
-/* Function signatures for the main malloc functions: */
-typedef void* (*mm_malloc_t)(size_t size);
-typedef void (*mm_free_t)(void*);
-typedef void* (*mm_calloc_t)(size_t nmemb, size_t size);
-typedef void* (*mm_realloc_t)(void *ptr, size_t size);
-
-/* Function pointers to the real/next implementations: */
-static mm_malloc_t mm_real_malloc;
-static mm_free_t mm_real_free;
-static mm_calloc_t mm_real_calloc;
-static mm_realloc_t mm_real_realloc;
-
-static int mm_initializing;
-static int mm_initialized;
-
-/** Constructor functions used to initialize the malloc implementation
- */
-XBT_ATTRIB_CONSTRUCTOR(101) static void mm_legacy_constructor()
-{
- if (mm_initialized)
- return;
- mm_initializing = 1;
- __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;
-}
-
-/* ***** malloc/free implementation
- *
- * They call either the underlying/native/RTLD_NEXT implementation (non MC mode)
- * or the mm implementation (MC mode).
- *
- * If we are initializing the malloc subsystem, we call the fake/dummy `malloc`
- * implementation. This is necessary because `dlsym` calls `malloc` and friends.
- */
-
-#define GET_HEAP() __mmalloc_current_heap
-
-void *malloc(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;
-
- return mmalloc(mdp, n);
-}
-
-void *calloc(size_t nmemb, size_t size)
-{
- if (!mm_initialized) {
- if (mm_initializing)
- return mm_fake_calloc(nmemb, size);
- mm_legacy_constructor();
- }
-
- if (!__malloc_use_mmalloc) {
- return mm_real_calloc(nmemb, size);
- }
-
- xbt_mheap_t mdp = GET_HEAP();
- if (!mdp)
- return NULL;
-
- void *ret = mmalloc(mdp, nmemb*size);
- // This was already done in the callee:
- if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) {
- memset(ret, 0, nmemb * size);
- }
- return ret;
-}
-
-void *realloc(void *p, size_t s)
-{
- if (!mm_initialized) {
- if (mm_initializing)
- return mm_fake_realloc(p, s);
- mm_legacy_constructor();
- }
-
- if (!__malloc_use_mmalloc) {
- return mm_real_realloc(p, s);
- }
-
- xbt_mheap_t mdp = GET_HEAP();
- if (!mdp)
- return NULL;
-
- return mrealloc(mdp, p, s);
-}
-
-void free(void *p)
-{
- if (!mm_initialized) {
- if (mm_initializing)
- return mm_fake_free(p);
- mm_legacy_constructor();
- }
-
- if (!__malloc_use_mmalloc) {
- mm_real_free(p);
- return;
- }
-
- if (!p)
- return;
-
- xbt_mheap_t mdp = GET_HEAP();
- mfree(mdp, p);
-}
