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 */
11 #include "mmprivate.h"
12 #include "xbt_modinter.h"
13 #include "internal_config.h"
16 //#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
18 /* The mmalloc() package can use a single implicit malloc descriptor
19 for mmalloc/mrealloc/mfree operations which do not supply an explicit
20 descriptor. This allows mmalloc() to provide
21 backwards compatibility with the non-mmap'd version. */
22 xbt_mheap_t __mmalloc_default_mdp = NULL;
25 static xbt_mheap_t __mmalloc_current_heap = NULL; /* The heap we are currently using. */
27 xbt_mheap_t mmalloc_get_current_heap(void)
29 return __mmalloc_current_heap;
32 void mmalloc_set_current_heap(xbt_mheap_t new_heap)
34 __mmalloc_current_heap = new_heap;
37 #ifdef MMALLOC_WANT_OVERRIDE_LEGACY
39 /* Fake implementations, they are used to fool dlsym:
40 * dlsym used calloc and falls back to some other mechanism
43 static void* mm_fake_calloc(size_t nmemb, size_t size) { return NULL; }
44 static void* mm_fake_malloc(size_t n) { return NULL; }
45 static void* mm_fake_realloc(void *p, size_t s) { return NULL; }
47 /* Function signatures for the main malloc functions: */
48 typedef void* (*mm_malloc_t)(size_t size);
49 typedef void (*mm_free_t)(void*);
50 typedef void* (*mm_calloc_t)(size_t nmemb, size_t size);
51 typedef void* (*mm_realloc_t)(void *ptr, size_t size);
53 /* Function pointers to the real/next implementations: */
54 static mm_malloc_t mm_real_malloc = mm_fake_malloc;
55 static mm_free_t mm_real_free;
56 static mm_calloc_t mm_real_calloc = mm_fake_calloc;
57 static mm_realloc_t mm_real_realloc = mm_fake_realloc;
59 #define GET_HEAP() __mmalloc_current_heap
61 /** Constructor functions used to initialize the malloc implementation
63 static void __attribute__((constructor(101))) mm_legacy_constructor()
65 bool use_mm = !getenv("SIMGRID_MALLOC_NO_USE_MM");
67 __mmalloc_current_heap = mmalloc_preinit();
69 mm_real_realloc = (mm_realloc_t) dlsym(RTLD_NEXT, "realloc");
70 mm_real_malloc = (mm_malloc_t) dlsym(RTLD_NEXT, "malloc");
71 mm_real_free = (mm_free_t) dlsym(RTLD_NEXT, "free");
72 mm_real_calloc = (mm_calloc_t) dlsym(RTLD_NEXT, "calloc");
76 void *malloc(size_t n)
78 if (!__mmalloc_current_heap) {
79 return mm_real_malloc(n);
82 xbt_mheap_t mdp = GET_HEAP();
87 void *ret = mmalloc(mdp, n);
92 void *calloc(size_t nmemb, size_t size)
94 if (!__mmalloc_current_heap) {
95 return mm_real_calloc(nmemb, size);
98 xbt_mheap_t mdp = GET_HEAP();
103 void *ret = mmalloc(mdp, nmemb*size);
105 // This was already done in the callee:
106 if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) {
107 memset(ret, 0, nmemb * size);
112 void *realloc(void *p, size_t s)
114 if (!__mmalloc_current_heap) {
115 return mm_real_realloc(p, s);
118 xbt_mheap_t mdp = GET_HEAP();
123 void* ret = mrealloc(mdp, p, s);
133 if (!__mmalloc_current_heap) {
138 xbt_mheap_t mdp = GET_HEAP();
143 #endif /* WANT_MALLOC_OVERRIDE */