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 "../../mc/mc_base.h"
15 #include "mmprivate.h"
16 #include "xbt_modinter.h"
17 #include "internal_config.h"
20 //#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
22 /* The mmalloc() package can use a single implicit malloc descriptor
23 for mmalloc/mrealloc/mfree operations which do not supply an explicit
24 descriptor. This allows mmalloc() to provide
25 backwards compatibility with the non-mmap'd version. */
26 xbt_mheap_t __mmalloc_default_mdp = NULL;
28 static int __malloc_use_mmalloc;
30 int malloc_use_mmalloc(void)
32 return __malloc_use_mmalloc;
35 static xbt_mheap_t __mmalloc_current_heap = NULL; /* The heap we are currently using. */
37 xbt_mheap_t mmalloc_get_current_heap(void)
39 return __mmalloc_current_heap;
42 void mmalloc_set_current_heap(xbt_mheap_t new_heap)
44 __mmalloc_current_heap = new_heap;
47 #ifdef MMALLOC_WANT_OVERRIDE_LEGACY
49 /* Fake implementations, they are used to fool dlsym:
50 * dlsym used calloc and falls back to some other mechanism
53 static void* mm_fake_calloc(size_t nmemb, size_t size) { return NULL; }
54 static void* mm_fake_malloc(size_t n) { return NULL; }
55 static void* mm_fake_realloc(void *p, size_t s) { return NULL; }
57 /* Function signatures for the main malloc functions: */
58 typedef void* (*mm_malloc_t)(size_t size);
59 typedef void (*mm_free_t)(void*);
60 typedef void* (*mm_calloc_t)(size_t nmemb, size_t size);
61 typedef void* (*mm_realloc_t)(void *ptr, size_t size);
63 /* Function pointers to the real/next implementations: */
64 static mm_malloc_t mm_real_malloc = mm_fake_malloc;
65 static mm_free_t mm_real_free;
66 static mm_calloc_t mm_real_calloc = mm_fake_calloc;
67 static mm_realloc_t mm_real_realloc = mm_fake_realloc;
69 #define GET_HEAP() __mmalloc_current_heap
71 /** Constructor functions used to initialize the malloc implementation
73 static void __attribute__((constructor(101))) mm_legacy_constructor()
75 __malloc_use_mmalloc = getenv(MC_ENV_VARIABLE) ? 1 : 0;
76 if (__malloc_use_mmalloc) {
77 __mmalloc_current_heap = mmalloc_preinit();
79 mm_real_realloc = (mm_realloc_t) dlsym(RTLD_NEXT, "realloc");
80 mm_real_malloc = (mm_malloc_t) dlsym(RTLD_NEXT, "malloc");
81 mm_real_free = (mm_free_t) dlsym(RTLD_NEXT, "free");
82 mm_real_calloc = (mm_calloc_t) dlsym(RTLD_NEXT, "calloc");
86 void *malloc(size_t n)
88 if (!__malloc_use_mmalloc) {
89 return mm_real_malloc(n);
92 xbt_mheap_t mdp = GET_HEAP();
97 void *ret = mmalloc(mdp, n);
102 void *calloc(size_t nmemb, size_t size)
104 if (!__malloc_use_mmalloc) {
105 return mm_real_calloc(nmemb, size);
108 xbt_mheap_t mdp = GET_HEAP();
113 void *ret = mmalloc(mdp, nmemb*size);
115 // This was already done in the callee:
116 if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) {
117 memset(ret, 0, nmemb * size);
122 void *realloc(void *p, size_t s)
124 if (!__malloc_use_mmalloc) {
125 return mm_real_realloc(p, s);
128 xbt_mheap_t mdp = GET_HEAP();
133 void* ret = mrealloc(mdp, p, s);
140 if (!__malloc_use_mmalloc) {
148 xbt_mheap_t mdp = GET_HEAP();
153 #endif /* WANT_MALLOC_OVERRIDE */