X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1b6d36b7082f7cc657eb2473d1ac27d250954688..49b058066db4e2b4e78b9f7924dd3795a024d94a:/src/xbt/mmalloc/mm_legacy.c

diff --git a/src/xbt/mmalloc/mm_legacy.c b/src/xbt/mmalloc/mm_legacy.c
index 96610ee1ca..2a1a5863ce 100644
--- a/src/xbt/mmalloc/mm_legacy.c
+++ b/src/xbt/mmalloc/mm_legacy.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010. The SimGrid Team.
+/* Copyright (c) 2010-2013. The SimGrid Team.
  * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
@@ -7,9 +7,10 @@
 /* Redefine the classical malloc/free/realloc functions so that they fit well in the mmalloc framework */
 
 #include "mmprivate.h"
-#include "gras_config.h"
+#include "internal_config.h"
 #include <math.h>
 
+//#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
 
 /* The mmalloc() package can use a single implicit malloc descriptor
    for mmalloc/mrealloc/mfree operations which do not supply an explicit
@@ -30,7 +31,124 @@ void mmalloc_set_current_heap(xbt_mheap_t new_heap)
   __mmalloc_current_heap = new_heap;
 }
 
+
 #ifdef MMALLOC_WANT_OVERRIDE_LEGACY
+#ifdef HAVE_GNU_LD
+
+#undef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#include <dlfcn.h>
+
+static void * (*real_malloc) (size_t);
+static void * (*real_realloc) (void*,size_t);
+static void * (*real_free) (void*);
+
+static void mm_gnuld_legacy_init(void) { /* This function is called from mmalloc_preinit(); it works even if it's static because all mm is in mm.c */
+  real_malloc = (void * (*) (size_t)) dlsym(RTLD_NEXT, "malloc");
+  real_realloc = (void * (*) (void*,size_t)) dlsym(RTLD_NEXT, "realloc");
+  real_free = (void * (*) (void*)) dlsym(RTLD_NEXT, "free");
+  __mmalloc_current_heap = __mmalloc_default_mdp;
+}
+
+/* Hello pimple!
+ * DL needs some memory while resolving the malloc symbol, that is somehow problematic
+ * To that extend, we have a little area here living in .BSS that we return if asked for memory before the malloc is resolved.
+ */
+int allocated_junk=0; /* keep track of whether our little area was already given to someone */
+char junkarea[4096];
+
+/* This version use mmalloc if there is a current heap, or the legacy implem if not */
+void *malloc(size_t n) {
+  xbt_mheap_t mdp = __mmalloc_current_heap;
+  void *ret;
+#ifdef MM_LEGACY_VERBOSE
+  static int warned_raw = 0;
+  static int warned_mmalloc = 0;
+#endif
+
+  if (mdp) {
+    LOCK(mdp);
+    ret = mmalloc(mdp, n);
+    UNLOCK(mdp);
+#ifdef MM_LEGACY_VERBOSE
+    if (!warned_mmalloc) {
+      fprintf(stderr,"Using mmalloc; enabling the model-checker in cmake may have a bad impact on your simulation performance\n");
+      warned_mmalloc = 1;
+    }
+#endif
+  } else {
+    if (!real_malloc) {
+      if (allocated_junk) {
+        fprintf(stderr,
+            "Panic: real malloc symbol not resolved yet, and I already gave my little private memory chunk away. "
+            "Damn LD, we must extend our code to have several such areas.\n");
+        exit(1);
+      } else if (n > sizeof junkarea) {
+        fprintf(stderr,
+            "Panic: real malloc symbol not resolved yet, and I need %zu bytes while my little private memory chunk is only %zu bytes wide. "
+            "Damn LD, we must fix our code to extend this area.\n", n, sizeof junkarea);
+        exit(1);
+      } else {
+        allocated_junk = 1;
+        return junkarea;
+      }
+    }
+#ifdef MM_LEGACY_VERBOSE
+    if (!warned_raw) {
+      fprintf(stderr,"Using system malloc after interception; you seem to be currently model-checking\n");
+      warned_raw = 1;
+    }
+#endif
+    ret = real_malloc(n);
+  }
+  return ret;
+}
+
+
+void *calloc(size_t nmemb, size_t size)
+{
+  void *ret = malloc(nmemb*size);
+  memset(ret, 0, nmemb * size);
+  return ret;
+}
+
+void *realloc(void *p, size_t s)
+{
+  xbt_mheap_t mdp = __mmalloc_current_heap;
+  void *ret;
+
+  if (mdp) {
+    LOCK(mdp);
+    ret = mrealloc(mdp, p, s);
+    UNLOCK(mdp);
+  } else {
+    ret = real_realloc(p,s);
+  }
+
+  return ret;
+}
+
+void free(void *p)
+{
+  if (p==NULL)
+    return;
+  if (p!=junkarea) {
+    xbt_mheap_t mdp = __mmalloc_current_heap;
+
+    if (mdp) {
+      LOCK(mdp);
+      mfree(mdp, p);
+      UNLOCK(mdp);
+    } else {
+      real_free(p);
+    }
+  } else {
+    allocated_junk=0;
+  }
+}
+
+
+#else /* NO GNU_LD */
 void *malloc(size_t n)
 {
   xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
@@ -77,6 +195,7 @@ void free(void *p)
     UNLOCK(mdp);
   }
 }
-#endif
+#endif /* NO GNU_LD */
+#endif /* WANT_MALLOC_OVERRIDE */