1 /* Copyright (c) 2010-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /* Redefine the classical malloc/free/realloc functions so that they fit well in the mmalloc framework */
14 #include "mmprivate.h"
15 #include "xbt_modinter.h"
16 #include "internal_config.h"
19 //#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
21 /* The mmalloc() package can use a single implicit malloc descriptor
22 for mmalloc/mrealloc/mfree operations which do not supply an explicit
23 descriptor. This allows mmalloc() to provide
24 backwards compatibility with the non-mmap'd version. */
25 xbt_mheap_t __mmalloc_default_mdp = NULL;
28 static xbt_mheap_t __mmalloc_current_heap = NULL; /* The heap we are currently using. */
30 xbt_mheap_t mmalloc_get_current_heap(void)
32 return __mmalloc_current_heap;
35 void mmalloc_set_current_heap(xbt_mheap_t new_heap)
37 __mmalloc_current_heap = new_heap;
40 #ifdef MMALLOC_WANT_OVERRIDE_LEGACY
42 /* Fake implementations, they are used to fool dlsym:
43 * dlsym used calloc and falls back to some other mechanism
46 static void* mm_fake_calloc(size_t nmemb, size_t size) { return NULL; }
47 static void* mm_fake_malloc(size_t n) { return NULL; }
48 static void* mm_fake_realloc(void *p, size_t s) { return NULL; }
50 /* Function signatures for the main malloc functions: */
51 typedef void* (*mm_malloc_t)(size_t size);
52 typedef void (*mm_free_t)(void*);
53 typedef void* (*mm_calloc_t)(size_t nmemb, size_t size);
54 typedef void* (*mm_realloc_t)(void *ptr, size_t size);
56 /* Function pointers to the real/next implementations: */
57 static mm_malloc_t mm_real_malloc = mm_fake_malloc;
58 static mm_free_t mm_real_free;
59 static mm_calloc_t mm_real_calloc = mm_fake_calloc;
60 static mm_realloc_t mm_real_realloc = mm_fake_realloc;
62 #define GET_HEAP() __mmalloc_current_heap
64 static const char* env_name = "SIMGRID_MALLOC_USE_MM";
66 int mmalloc_exec_using_mm(int argc, const char** argv)
68 char** argv2 = (char**) malloc(sizeof(char*) * (argc+1));
69 memcpy(argv2, argv, sizeof(char*) * argc);
71 if (setenv(env_name, "1", 1) >= 0) {
72 execv(argv[0], argv2);
75 fprintf(stderr, "Could not restart with mm malloc\n");
80 void mmalloc_ensure_using_mm(int argc, const char** argv)
82 if (!__mmalloc_default_mdp) {
83 mmalloc_exec_using_mm(argc, argv);
87 /** Constructor functions used to initialize the malloc implementation
89 static void __attribute__((constructor(101))) mm_legacy_constructor()
91 bool use_mm = getenv(env_name);
93 __mmalloc_current_heap = mmalloc_preinit();
95 mm_real_realloc = (mm_realloc_t) dlsym(RTLD_NEXT, "realloc");
96 mm_real_malloc = (mm_malloc_t) dlsym(RTLD_NEXT, "malloc");
97 mm_real_free = (mm_free_t) dlsym(RTLD_NEXT, "free");
98 mm_real_calloc = (mm_calloc_t) dlsym(RTLD_NEXT, "calloc");
102 void *malloc(size_t n)
104 if (!__mmalloc_current_heap) {
105 return mm_real_malloc(n);
108 xbt_mheap_t mdp = GET_HEAP();
113 void *ret = mmalloc(mdp, n);
118 void *calloc(size_t nmemb, size_t size)
120 if (!__mmalloc_current_heap) {
121 return mm_real_calloc(nmemb, size);
124 xbt_mheap_t mdp = GET_HEAP();
129 void *ret = mmalloc(mdp, nmemb*size);
131 // This was already done in the callee:
132 if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) {
133 memset(ret, 0, nmemb * size);
138 void *realloc(void *p, size_t s)
140 if (!__mmalloc_current_heap) {
141 return mm_real_realloc(p, s);
144 xbt_mheap_t mdp = GET_HEAP();
149 void* ret = mrealloc(mdp, p, s);
159 if (!__mmalloc_current_heap) {
164 xbt_mheap_t mdp = GET_HEAP();
169 #endif /* WANT_MALLOC_OVERRIDE */