-/* 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
/* 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>
-static void *__mmalloc_current_heap = NULL; /* The heap we are currently using. */
+//#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
-#include "xbt_modinter.h"
+/* 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;
-void *mmalloc_get_current_heap(void)
+
+static xbt_mheap_t __mmalloc_current_heap = NULL; /* The heap we are currently using. */
+
+xbt_mheap_t mmalloc_get_current_heap(void)
{
return __mmalloc_current_heap;
}
-void mmalloc_set_current_heap(void *new_heap)
+void mmalloc_set_current_heap(xbt_mheap_t new_heap)
{
__mmalloc_current_heap = new_heap;
}
-#ifdef MMALLOC_WANT_OVERIDE_LEGACY
-void *malloc(size_t n)
-{
- void *mdp = __mmalloc_current_heap;
-#ifdef HAVE_MMAP
- if (!mdp)
- mmalloc_preinit();
+
+#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
- LOCK(mdp);
- void *ret = mmalloc(mdp, n);
- UNLOCK(mdp);
+ 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)
{
- size_t total_size = nmemb * size;
- void *mdp = __mmalloc_current_heap;
-#ifdef HAVE_MMAP
- if (!mdp)
- mmalloc_preinit();
-#endif
- LOCK(mdp);
- void *ret = mmalloc(mdp, total_size);
- UNLOCK(mdp);
-
- /* Fill the allocated memory with zeroes to mimic calloc behaviour */
- memset(ret, '\0', total_size);
-
+ void *ret = malloc(nmemb*size);
+ memset(ret, 0, nmemb * size);
return ret;
}
void *realloc(void *p, size_t s)
{
- void *ret = NULL;
- void *mdp = __mmalloc_current_heap;
-#ifdef HAVE_MMAP
- if (!mdp)
- mmalloc_preinit();
-#endif
- LOCK(mdp);
- if (s) {
- if (p)
- ret = mrealloc(mdp, p, s);
- else
- ret = mmalloc(mdp, s);
+ xbt_mheap_t mdp = __mmalloc_current_heap;
+ void *ret;
+
+ if (mdp) {
+ LOCK(mdp);
+ ret = mrealloc(mdp, p, s);
+ UNLOCK(mdp);
} else {
- mfree(mdp, p);
+ ret = real_realloc(p,s);
}
- UNLOCK(mdp);
return ret;
}
void free(void *p)
{
- void *mdp = __mmalloc_current_heap;
-#ifdef HAVE_GTNETS
- if(!mdp) return;
-#endif
- LOCK(mdp);
- mfree(mdp, p);
- UNLOCK(mdp);
-}
-#endif
-
-/* Make sure it works with md==NULL */
+ if (p==NULL)
+ return;
+ if (p!=junkarea) {
+ xbt_mheap_t mdp = __mmalloc_current_heap;
-/* Safety gap from the heap's break address.
- * Try to increase this first if you experience strange errors under
- * valgrind. */
-#define HEAP_OFFSET (128UL<<20)
-
-void *mmalloc_get_default_md(void)
-{
- xbt_assert(__mmalloc_default_mdp);
- return __mmalloc_default_mdp;
-}
-
-static void mmalloc_fork_prepare(void)
-{
- struct mdesc* mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
+ if (mdp) {
LOCK(mdp);
- if(mdp->fd >= 0){
- mdp->refcount++;
- }
- mdp = mdp->next_mdesc;
+ mfree(mdp, p);
+ UNLOCK(mdp);
+ } else {
+ real_free(p);
}
+ } else {
+ allocated_junk=0;
}
}
-static void mmalloc_fork_parent(void)
+
+#else /* NO GNU_LD */
+void *malloc(size_t n)
{
- struct mdesc* mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
- if(mdp->fd < 0)
- UNLOCK(mdp);
- mdp = mdp->next_mdesc;
- }
- }
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
+
+ LOCK(mdp);
+ void *ret = mmalloc(mdp, n);
+ UNLOCK(mdp);
+
+ return ret;
}
-static void mmalloc_fork_child(void)
+void *calloc(size_t nmemb, size_t size)
{
- struct mdesc* mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
- UNLOCK(mdp);
- mdp = mdp->next_mdesc;
- }
- }
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
+
+ LOCK(mdp);
+ void *ret = mmalloc(mdp, nmemb*size);
+ UNLOCK(mdp);
+ memset(ret, 0, nmemb * size);
+
+
+ return ret;
}
-/* Initialize the default malloc descriptor. */
-void mmalloc_preinit(void)
+void *realloc(void *p, size_t s)
{
- int res;
- if (!__mmalloc_default_mdp) {
- unsigned long mask = ~((unsigned long)getpagesize() - 1);
- void *addr = (void*)(((unsigned long)sbrk(0) + HEAP_OFFSET) & mask);
- __mmalloc_default_mdp = mmalloc_attach(-1, addr);
- /* Fixme? only the default mdp in protected against forks */
- res = xbt_os_thread_atfork(mmalloc_fork_prepare,
- mmalloc_fork_parent, mmalloc_fork_child);
- if (res != 0)
- THROWF(system_error,0,"xbt_os_thread_atfork() failed: return value %d",res);
- }
- xbt_assert(__mmalloc_default_mdp != NULL);
+ void *ret = NULL;
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
+
+ LOCK(mdp);
+ ret = mrealloc(mdp, p, s);
+ UNLOCK(mdp);
+
+ return ret;
}
-void mmalloc_postexit(void)
+void free(void *p)
{
- /* Do not detach the default mdp or ldl won't be able to free the memory it allocated since we're in memory */
- // mmalloc_detach(__mmalloc_default_mdp);
- mmalloc_pre_detach(__mmalloc_default_mdp);
+ if (p != NULL) {
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
+
+ LOCK(mdp);
+ mfree(mdp, p);
+ UNLOCK(mdp);
+ }
}
+#endif /* NO GNU_LD */
+#endif /* WANT_MALLOC_OVERRIDE */
+
+
