-/* Copyright (c) 2010. The SimGrid Team.
+/* Copyright (c) 2010-2014. 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 "xbt_modinter.h"
+#include "internal_config.h"
+#include <math.h>
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_mm_legacy, xbt,
- "Logging specific to mm_legacy in mmalloc");
+//#define MM_LEGACY_VERBOSE 1 /* define this to see which version of malloc gets used */
-static void *__mmalloc_current_heap = NULL; /* The heap we are currently using. */
+/* 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;
-#include "xbt_modinter.h"
-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
+#if 0 && defined(HAVE_GNU_LD)
+
+#undef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#include <dlfcn.h>
+
+static void * (*real_malloc) (size_t) = NULL;
+static void * (*real_realloc) (void*,size_t) = NULL;
+static void * (*real_free) (void*) = NULL;
+
+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.
+ */
+static int allocated_junk = 0; /* keep track of many blocks of our little area was already given to someone */
+#define JUNK_SIZE 8
+#define MAX_JUNK_AREAS (64 * 1024 / JUNK_SIZE)
+static char junkareas[MAX_JUNK_AREAS][JUNK_SIZE];
+
+/* This version use mmalloc if there is a current heap, or the legacy implem if not */
+static void *malloc_or_calloc(size_t n, int setzero) {
+ 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);
+ // This was already done by mmalloc:
+ if (mdp->options & XBT_MHEAP_OPTION_MEMSET) {
+ setzero = 0;
+ }
+#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) {
+ size_t needed_areas = n / JUNK_SIZE;
+ if(needed_areas * JUNK_SIZE != n) needed_areas++;
+ if (allocated_junk+needed_areas>=MAX_JUNK_AREAS) {
+ fprintf(stderr,
+ "Panic: real malloc symbol not resolved yet, and I already gave my little private memory chunk away.\n");
+ exit(1);
+ } else {
+ size_t i = allocated_junk;
+ allocated_junk += needed_areas;
+ ret = junkareas[i];
+ }
+ }
+ else {
+#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);
+ }
+ if (ret && setzero) {
+ memset(ret, 0, n);
+ }
return ret;
}
-void *calloc(size_t nmemb, size_t size)
+void *malloc(size_t n)
{
- 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);
+ return malloc_or_calloc(n, 0);
+}
- return ret;
+void *calloc(size_t nmemb, size_t size)
+{
+ return malloc_or_calloc(nmemb*size, 1);
}
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 {
- if (p)
- 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<(void*)junkareas || p>=(void*)(junkareas[MAX_JUNK_AREAS]) ) {
+ // main use case
-/* 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)
+ xbt_mheap_t mdp = __mmalloc_current_heap;
-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;
- }
- }
-}
-
-static void mmalloc_fork_parent(void)
-{
- struct mdesc* mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
- if(mdp->fd < 0)
- UNLOCK(mdp);
- mdp = mdp->next_mdesc;
- }
- }
-}
-
-static void mmalloc_fork_child(void)
-{
- struct mdesc* mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
+ mfree(mdp, p);
UNLOCK(mdp);
- mdp = mdp->next_mdesc;
+ } else {
+ real_free(p);
+ }
+ } else {
+ // We are in the junkarea.
+ // This area is used to allocate memory at initilization time.
+
+ if(allocated_junk && p==junkareas[allocated_junk-1]) {
+ // Last junkarea. We can reuse it.
+ allocated_junk--;
+ } else {
+ // We currently cannot reuse freed junkareas in the general case.
}
}
}
-/* Initialize the default malloc descriptor. */
-void mmalloc_preinit(void)
-{
- 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 mmalloc_postexit(void)
+#else /* NO GNU_LD */
+void *malloc(size_t n)
{
- /* 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);
-}
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
-int mmalloc_compare_heap(void *h1, void *h2){
-
- if(h1 == NULL && h2 == NULL){
- XBT_DEBUG("Malloc descriptors null");
- return 0;
- }
-
-
- /* Heapstats */
-
- struct mstats ms1 = mmstats(h1);
- struct mstats ms2 = mmstats(h2);
-
- if(ms1.bytes_total != ms2.bytes_total){
- XBT_DEBUG("Different total size of the heap");
- return 1;
- }
-
- if(ms1.chunks_used != ms2.chunks_used){
- XBT_DEBUG("Different chunks allocated by the user");
- return 1;
- }
-
- if(ms1.bytes_used != ms2.bytes_used){
- XBT_DEBUG("Different byte total of user-allocated chunks");
- return 1;
- }
-
- if(ms1.bytes_free != ms2.bytes_free){
- XBT_DEBUG("Different byte total of chunks in the free list");
- return 1;
- }
-
- if(ms1.chunks_free != ms2.chunks_free){
- XBT_DEBUG("Different chunks in the free list");
- return 1;
- }
+ LOCK(mdp);
+ void *ret = mmalloc(mdp, n);
+ UNLOCK(mdp);
- struct mdesc *mdp1, *mdp2;
- mdp1 = MD_TO_MDP(h1);
- mdp2 = MD_TO_MDP(h2);
-
- if(mmalloc_compare_mdesc(mdp1, mdp2))
- return 1;
-
- return 0;
+ return ret;
}
-int mmalloc_compare_mdesc(struct mdesc *mdp1, struct mdesc *mdp2){
-
- if(mdp1->headersize != mdp2->headersize){
- XBT_DEBUG("Different size of the file header for the mapped files");
- return 1;
- }
-
- if(mdp1->refcount != mdp2->refcount){
- XBT_DEBUG("Different number of processes that attached the heap");
- return 1;
- }
-
- if(strcmp(mdp1->magic, mdp2->magic) != 0){
- XBT_DEBUG("Different magic number");
- return 1;
- }
-
- if(mdp1->flags != mdp2->flags){
- XBT_DEBUG("Different flags");
- return 1;
- }
-
- if(mdp1->heapsize != mdp2->heapsize){
- XBT_DEBUG("Different number of info entries");
- return 1;
- }
-
- //XBT_DEBUG("Heap size : %d", mdp1->heapsize);
-
- if(mdp1->heapbase != mdp2->heapbase){
- XBT_DEBUG("Different first block of the heap");
- return 1;
- }
-
- if(mdp1->heapindex != mdp2->heapindex){
- XBT_DEBUG("Different index for the heap table");
- return 1;
- }
-
- XBT_DEBUG("Heap index : %d", mdp1->heapindex);
-
- if(mdp1->base != mdp2->base){
- XBT_DEBUG("Different base address of the memory region");
- return 1;
- }
+void *calloc(size_t nmemb, size_t size)
+{
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
- if(mdp1->breakval != mdp2->breakval){
- XBT_DEBUG("Different current location in the memory region");
- return 1;
- }
+ LOCK(mdp);
+ void *ret = mmalloc(mdp, nmemb*size);
+ UNLOCK(mdp);
- if(mdp1->top != mdp2->top){
- XBT_DEBUG("Different end of the current location in the memory region");
- return 1;
- }
-
- if(mdp1->heaplimit != mdp2->heaplimit){
- XBT_DEBUG("Different limit of valid info table indices");
- return 1;
+ // This was already done in the callee:
+ if(!(mdp->options & XBT_MHEAP_OPTION_MEMSET)) {
+ memset(ret, 0, nmemb * size);
}
- //XBT_DEBUG("Heap limit : %d", mdp1->heaplimit);
-
-
- if(mdp1->fd != mdp2->fd){
- XBT_DEBUG("Different file descriptor for the file to which this malloc heap is mapped");
- return 1;
- }
+ return ret;
+}
- if(mdp1->saved_errno != mdp2->saved_errno){
- XBT_DEBUG("Different errno");
- return 1;
- }
+void *realloc(void *p, size_t s)
+{
+ void *ret = NULL;
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
- if(mdp1->version != mdp2->version){
- XBT_DEBUG("Different version of the mmalloc package");
- return 1;
- }
+ LOCK(mdp);
+ ret = mrealloc(mdp, p, s);
+ UNLOCK(mdp);
-
- size_t block_free1, start1, block_free2 , start2, block_busy1, block_busy2 ;
- unsigned int i;
-
- start1 = block_free1 = mdp1->heapindex;
- start2 = block_free2 = mdp2->heapindex;
- block_busy1 = start1 + mdp1->heapinfo[start1].free.size;
- block_busy2 = start2 + mdp2->heapinfo[start2].free.size;
-
- //XBT_DEBUG("Block busy : %d - %d", block_busy1, block_busy2);
-
-
- if(mdp1->heapinfo[start1].free.size != mdp2->heapinfo[start2].free.size){ // <=> check block_busy
-
- XBT_DEBUG("Different size (in blocks) of a free cluster");
- return 1;
-
- }else{
-
- if(mdp1->heapinfo[start1].free.next != mdp2->heapinfo[start1].free.next){
-
- XBT_DEBUG("Different index of next free cluster");
- return 1;
-
- }else{
-
- for(i=block_busy1 ; i<mdp1->heapinfo[start1].free.next ; i++){
- if(mdp1->heapinfo[i].busy.type != mdp2->heapinfo[i].busy.type){
- XBT_DEBUG("Different type of busy block");
- return 1;
- }else{
- switch(mdp1->heapinfo[i].busy.type){
- case 0 :
- if(mdp1->heapinfo[i].busy.info.size != mdp2->heapinfo[i].busy.info.size){
- XBT_DEBUG("Different size of a large cluster");
- return 1;
- }
- break;
- default :
- if(mdp1->heapinfo[i].busy.info.frag.nfree != mdp2->heapinfo[i].busy.info.frag.nfree){
- XBT_DEBUG("Different free fragments in a fragmented block");
- return 1;
- }else{
- if(mdp1->heapinfo[i].busy.info.frag.first != mdp2->heapinfo[i].busy.info.frag.first){
- XBT_DEBUG("Different first free fragments of the block");
- return 1;
- }
- }
- break;
- }
- }
- }
- }
+ return ret;
+}
- block_free1 = mdp1->heapinfo[start1].free.next;
- block_free2 = mdp2->heapinfo[start2].free.next;
-
- //XBT_DEBUG("Index of next free cluster : %d", block_free1);
-
- while((block_free1 != start1) && (block_free2 != start2)){
-
- block_busy1 = block_free1 + mdp1->heapinfo[block_free1].free.size;
- block_busy2 = block_free2 + mdp2->heapinfo[block_free2].free.size;
-
- if(block_busy1 != block_busy2){
- XBT_DEBUG("Different index of busy block");
- return 1;
- }else{
-
- //XBT_DEBUG("Index of next busy block : %d - %d", block_busy1, block_busy2);
- //XBT_DEBUG("Index of next free cluster : %d", mdp1->heapinfo[block_free1].free.next);
-
- for(i=block_busy1 ; i<mdp1->heapinfo[block_free1].free.next ; i++){
- if(mdp1->heapinfo[i].busy.type != mdp2->heapinfo[i].busy.type){
- XBT_DEBUG("Different type of busy block");
- return 1;
- }else{
- switch(mdp1->heapinfo[i].busy.type){
- case 0 :
- if(mdp1->heapinfo[i].busy.info.size != mdp2->heapinfo[i].busy.info.size){
- XBT_DEBUG("Different size of a large cluster");
- return 1;
- }
- break;
- default :
- if(mdp1->heapinfo[i].busy.info.frag.nfree != mdp2->heapinfo[i].busy.info.frag.nfree){
- XBT_DEBUG("Different free fragments in a fragmented block");
- return 1;
- }else{
- if(mdp1->heapinfo[i].busy.info.frag.first != mdp2->heapinfo[i].busy.info.frag.first){
- XBT_DEBUG("Different first free fragments of the block");
- return 1;
- }
- }
- break;
- }
- }
- }
- }
+void free(void *p)
+{
+ if (p != NULL) {
+ xbt_mheap_t mdp = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit();
- block_free1 = mdp1->heapinfo[block_free1].free.next;
- block_free2 = mdp2->heapinfo[block_free2].free.next;
-
- }
-
+ LOCK(mdp);
+ mfree(mdp, p);
+ UNLOCK(mdp);
}
-
-
- return 0;
-
-
-
}
-
-
-
-
-
+#endif /* NO GNU_LD */
+#endif /* WANT_MALLOC_OVERRIDE */
