1 /* Copyright (c) 2008-2012 Da SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "mc_private.h"
8 #include "xbt/mmalloc.h"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, mc,
11 "Logging specific to mc_compare");
13 static int data_bss_program_region_compare(void *d1, void *d2, size_t size);
14 static int data_bss_libsimgrid_region_compare(void *d1, void *d2, size_t size);
15 static int heap_region_compare(void *d1, void *d2, size_t size);
17 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, void *heap1, void *heap2, xbt_dynar_t equals);
18 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2);
19 static size_t heap_ignore_size(void *address);
20 static size_t data_bss_ignore_size(void *address);
22 static void stack_region_free(stack_region_t s);
23 static void heap_equality_free(heap_equality_t e);
25 static int is_stack_ignore_variable(char *frame, char *var_name);
26 static int compare_local_variables(char *s1, char *s2, xbt_dynar_t heap_equals);
28 static size_t heap_ignore_size(void *address){
29 unsigned int cursor = 0;
31 int end = xbt_dynar_length(mc_heap_comparison_ignore) - 1;
32 mc_heap_ignore_region_t region;
35 cursor = (start + end) / 2;
36 region = (mc_heap_ignore_region_t)xbt_dynar_get_as(mc_heap_comparison_ignore, cursor, mc_heap_ignore_region_t);
37 if(region->address == address)
39 if(region->address < address)
41 if(region->address > address)
48 static size_t data_bss_ignore_size(void *address){
49 unsigned int cursor = 0;
51 int end = xbt_dynar_length(mc_data_bss_comparison_ignore) - 1;
52 mc_data_bss_ignore_variable_t var;
55 cursor = (start + end) / 2;
56 var = (mc_data_bss_ignore_variable_t)xbt_dynar_get_as(mc_data_bss_comparison_ignore, cursor, mc_data_bss_ignore_variable_t);
57 if(var->address == address)
59 if(var->address < address)
61 if(var->address > address)
68 static int data_bss_program_region_compare(void *d1, void *d2, size_t size){
72 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
74 for(i=0; i<size; i++){
75 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
76 pointer_align = (i / sizeof(void*)) * sizeof(void*);
77 addr_pointed1 = *((void **)((char *)d1 + pointer_align));
78 addr_pointed2 = *((void **)((char *)d2 + pointer_align));
79 if((addr_pointed1 > start_plt_binary && addr_pointed1 < end_plt_binary) || (addr_pointed2 > start_plt_binary && addr_pointed2 < end_plt_binary)){
82 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
83 XBT_VERB("Different byte (offset=%zu) (%p - %p) in data program region", i, (char *)d1 + i, (char *)d2 + i);
84 XBT_VERB("Addresses pointed : %p - %p", addr_pointed1, addr_pointed2);
94 static int data_bss_libsimgrid_region_compare(void *d1, void *d2, size_t size){
96 size_t i = 0, ignore_size = 0;
98 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
100 for(i=0; i<size; i++){
101 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
102 if((ignore_size = data_bss_ignore_size((char *)start_data_libsimgrid+i)) > 0){
105 }else if((ignore_size = data_bss_ignore_size((char *)start_bss_libsimgrid+i)) > 0){
109 pointer_align = (i / sizeof(void*)) * sizeof(void*);
110 addr_pointed1 = *((void **)((char *)d1 + pointer_align));
111 addr_pointed2 = *((void **)((char *)d2 + pointer_align));
112 if((addr_pointed1 > start_plt_libsimgrid && addr_pointed1 < end_plt_libsimgrid) || (addr_pointed2 > start_plt_libsimgrid && addr_pointed2 < end_plt_libsimgrid)){
114 }else if(addr_pointed1 >= raw_heap && addr_pointed1 <= end_raw_heap && addr_pointed2 >= raw_heap && addr_pointed2 <= end_raw_heap){
117 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
118 XBT_VERB("Different byte (offset=%zu) (%p - %p) in libsimgrid region", i, (char *)d1 + i, (char *)d2 + i);
119 XBT_VERB("Addresses pointed : %p - %p", addr_pointed1, addr_pointed2);
129 static int heap_region_compare(void *d1, void *d2, size_t size){
133 for(i=0; i<size; i++){
134 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
135 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
136 XBT_VERB("Different byte (offset=%zu) (%p - %p) in heap region", i, (char *)d1 + i, (char *)d2 + i);
145 static void stack_region_free(stack_region_t s){
147 xbt_free(s->process_name);
152 void stack_region_free_voidp(void *s){
153 stack_region_free((stack_region_t) * (void **) s);
156 static void heap_equality_free(heap_equality_t e){
162 void heap_equality_free_voidp(void *e){
163 heap_equality_free((heap_equality_t) * (void **) e);
166 int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2, mc_comparison_times_t ct1, mc_comparison_times_t ct2){
168 raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
172 int errors = 0, i = 0;
174 if(s1->num_reg != s2->num_reg){
175 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
176 XBT_VERB("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
181 int heap_index = 0, data_libsimgrid_index = 0, data_program_index = 0;
183 /* Get index of regions */
184 while(i < s1->num_reg){
185 switch(s1->regions[i]->type){
191 data_libsimgrid_index = i;
193 while( i < s1->num_reg && s1->regions[i]->type == 1)
197 data_program_index = i;
199 while( i < s1->num_reg && s1->regions[i]->type == 2)
205 ct1->nb_comparisons++;
206 ct2->nb_comparisons++;
208 xbt_os_timer_t global_timer = xbt_os_timer_new();
209 xbt_os_timer_t timer = xbt_os_timer_new();
211 xbt_os_timer_start(global_timer);
213 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
214 xbt_os_timer_start(timer);
216 /* Compare number of blocks/fragments used in each heap */
217 size_t chunks_used1 = mmalloc_get_chunks_used((xbt_mheap_t)s1->regions[heap_index]->data);
218 size_t chunks_used2 = mmalloc_get_chunks_used((xbt_mheap_t)s2->regions[heap_index]->data);
219 if(chunks_used1 != chunks_used2){
220 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
221 xbt_os_timer_stop(timer);
222 xbt_dynar_push_as(ct1->chunks_used_comparison_times, double, xbt_os_timer_elapsed(timer));
223 xbt_dynar_push_as(ct2->chunks_used_comparison_times, double, xbt_os_timer_elapsed(timer));
224 XBT_DEBUG("Different number of chunks used in each heap : %zu - %zu", chunks_used1, chunks_used2);
227 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
228 XBT_VERB("Different number of chunks used in each heap : %zu - %zu", chunks_used1, chunks_used2);
230 xbt_os_timer_free(timer);
231 xbt_os_timer_stop(global_timer);
232 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
233 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
234 xbt_os_timer_free(global_timer);
242 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
243 xbt_os_timer_stop(timer);
246 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
247 xbt_os_timer_start(timer);
249 /* Compare size of stacks */
250 unsigned int cursor = 0;
251 void *addr_stack1, *addr_stack2;
253 size_t size_used1, size_used2;
255 while(cursor < xbt_dynar_length(stacks_areas)){
256 addr_stack1 = (char *)s1->regions[heap_index]->data + ((char *)((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->address - (char *)std_heap);
257 addr_stack2 = (char *)s2->regions[heap_index]->data + ((char *)((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->address - (char *)std_heap);
258 sp1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
259 sp2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
260 size_used1 = ((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->size - ((char*)sp1 - (char*)addr_stack1);
261 size_used2 = ((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->size - ((char*)sp2 - (char*)addr_stack2);
262 if(size_used1 != size_used2){
263 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
265 xbt_os_timer_stop(timer);
266 xbt_dynar_push_as(ct1->stacks_sizes_comparison_times, double, xbt_os_timer_elapsed(timer));
267 xbt_dynar_push_as(ct2->stacks_sizes_comparison_times, double, xbt_os_timer_elapsed(timer));
269 XBT_DEBUG("Different size used in stacks : %zu - %zu", size_used1, size_used2);
273 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
274 XBT_VERB("Different size used in stacks : %zu - %zu", size_used1, size_used2);
276 xbt_os_timer_free(timer);
277 xbt_os_timer_stop(global_timer);
278 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
279 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
280 xbt_os_timer_free(global_timer);
290 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
292 xbt_os_timer_stop(timer);
293 xbt_os_timer_start(timer);
296 /* Compare program data segment(s) */
298 i = data_program_index;
299 while(i < s1->num_reg && s1->regions[i]->type == 2){
300 if(data_bss_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
301 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
303 xbt_os_timer_stop(timer);
304 xbt_dynar_push_as(ct1->program_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
305 xbt_dynar_push_as(ct2->program_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
307 XBT_DEBUG("Different memcmp for data in program");
311 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
312 XBT_VERB("Different memcmp for data in program");
314 xbt_os_timer_free(timer);
315 xbt_os_timer_stop(global_timer);
316 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
317 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
318 xbt_os_timer_free(global_timer);
328 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
330 xbt_os_timer_stop(timer);
331 xbt_os_timer_start(timer);
334 /* Compare libsimgrid data segment(s) */
336 i = data_libsimgrid_index;
337 while(i < s1->num_reg && s1->regions[i]->type == 1){
338 if(data_bss_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
339 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
341 xbt_os_timer_stop(timer);
342 xbt_dynar_push_as(ct1->libsimgrid_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
343 xbt_dynar_push_as(ct2->libsimgrid_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
345 XBT_DEBUG("Different memcmp for data in libsimgrid");
349 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
350 XBT_VERB("Different memcmp for data in libsimgrid");
352 xbt_os_timer_free(timer);
353 xbt_os_timer_stop(global_timer);
354 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
355 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
356 xbt_os_timer_free(global_timer);
366 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
368 xbt_os_timer_stop(timer);
369 xbt_os_timer_start(timer);
373 xbt_dynar_t stacks1 = xbt_dynar_new(sizeof(stack_region_t), stack_region_free_voidp);
374 xbt_dynar_t stacks2 = xbt_dynar_new(sizeof(stack_region_t), stack_region_free_voidp);
375 xbt_dynar_t equals = xbt_dynar_new(sizeof(heap_equality_t), heap_equality_free_voidp);
377 void *heap1 = s1->regions[heap_index]->data, *heap2 = s2->regions[heap_index]->data;
379 if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[heap_index]->data, (xbt_mheap_t)s2->regions[heap_index]->data, &stacks1, &stacks2, &equals)){
381 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
382 xbt_os_timer_stop(timer);
383 xbt_dynar_push_as(ct1->heap_comparison_times, double, xbt_os_timer_elapsed(timer));
384 xbt_dynar_push_as(ct2->heap_comparison_times, double, xbt_os_timer_elapsed(timer));
385 XBT_DEBUG("Different heap (mmalloc_compare)");
389 xbt_os_timer_free(timer);
390 xbt_dynar_free(&stacks1);
391 xbt_dynar_free(&stacks2);
392 xbt_dynar_free(&equals);
394 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
395 XBT_VERB("Different heap (mmalloc_compare)");
397 xbt_os_timer_stop(global_timer);
398 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
399 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
400 xbt_os_timer_free(global_timer);
407 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
408 xbt_os_timer_stop(timer);
411 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
412 xbt_os_timer_start(timer);
414 /* Stacks comparison */
416 stack_region_t stack_region1, stack_region2;
417 int diff = 0, diff_local = 0;
420 while(cursor < xbt_dynar_length(stacks1)){
421 stack_region1 = (stack_region_t)(xbt_dynar_get_as(stacks1, cursor, stack_region_t));
422 stack_region2 = (stack_region_t)(xbt_dynar_get_as(stacks2, cursor, stack_region_t));
423 sp1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
424 sp2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
425 diff = compare_stack(stack_region1, stack_region2, sp1, sp2, heap1, heap2, equals);
427 if(diff > 0){ /* Differences may be due to padding */
428 diff_local = compare_local_variables(((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->local_variables->data, ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->local_variables->data, equals);
430 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
432 xbt_os_timer_stop(timer);
433 xbt_dynar_push_as(ct1->stacks_comparison_times, double, xbt_os_timer_elapsed(timer));
434 xbt_dynar_push_as(ct2->stacks_comparison_times, double, xbt_os_timer_elapsed(timer));
436 XBT_DEBUG("Different local variables between stacks %d", cursor + 1);
440 xbt_dynar_free(&stacks1);
441 xbt_dynar_free(&stacks2);
442 xbt_dynar_free(&equals);
444 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
445 XBT_VERB("Different local variables between stacks %d", cursor + 1);
447 xbt_os_timer_free(timer);
448 xbt_os_timer_stop(global_timer);
449 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
450 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
451 xbt_os_timer_free(global_timer);
463 xbt_dynar_free(&stacks1);
464 xbt_dynar_free(&stacks2);
465 xbt_dynar_free(&equals);
467 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
468 xbt_os_timer_free(timer);
470 if(!XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
471 xbt_os_timer_stop(global_timer);
472 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
473 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
475 xbt_os_timer_free(global_timer);
484 static int is_stack_ignore_variable(char *frame, char *var_name){
486 unsigned int cursor = 0;
488 int end = xbt_dynar_length(mc_stack_comparison_ignore) - 1;
489 mc_stack_ignore_variable_t current_var;
492 cursor = (start + end) / 2;
493 current_var = (mc_stack_ignore_variable_t)xbt_dynar_get_as(mc_stack_comparison_ignore, cursor, mc_stack_ignore_variable_t);
494 if(strcmp(current_var->frame, frame) == 0){
495 if(strcmp(current_var->var_name, var_name) == 0)
497 if(strcmp(current_var->var_name, var_name) < 0)
499 if(strcmp(current_var->var_name, var_name) > 0)
502 if(strcmp(current_var->frame, frame) < 0)
504 if(strcmp(current_var->frame, frame) > 0)
511 static int compare_local_variables(char *s1, char *s2, xbt_dynar_t heap_equals){
513 xbt_dynar_t tokens1 = xbt_str_split(s1, NULL);
514 xbt_dynar_t tokens2 = xbt_str_split(s2, NULL);
516 xbt_dynar_t s_tokens1, s_tokens2;
517 unsigned int cursor = 0;
519 char *ip1 = NULL, *ip2 = NULL;
521 while(cursor < xbt_dynar_length(tokens1)){
522 s_tokens1 = xbt_str_split(xbt_dynar_get_as(tokens1, cursor, char *), "=");
523 s_tokens2 = xbt_str_split(xbt_dynar_get_as(tokens2, cursor, char *), "=");
524 if(xbt_dynar_length(s_tokens1) > 1 && xbt_dynar_length(s_tokens2) > 1){
525 if((strcmp(xbt_dynar_get_as(s_tokens1, 0, char *), "ip") == 0) && (strcmp(xbt_dynar_get_as(s_tokens2, 0, char *), "ip") == 0)){
526 ip1 = strdup(xbt_dynar_get_as(s_tokens1, 1, char *));
527 ip2 = strdup(xbt_dynar_get_as(s_tokens2, 1, char *));
528 /*if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
529 XBT_VERB("Instruction pointer : %s, Instruction pointer : %s", ip1, ip2);*/
531 if(strcmp(xbt_dynar_get_as(s_tokens1, 1, char *), xbt_dynar_get_as(s_tokens2, 1, char *)) != 0){
532 /* Ignore this variable ? */
533 if(is_stack_ignore_variable(ip1, xbt_dynar_get_as(s_tokens1, 0, char *)) && is_stack_ignore_variable(ip2, xbt_dynar_get_as(s_tokens2, 0, char *))){
534 xbt_dynar_free(&s_tokens1);
535 xbt_dynar_free(&s_tokens2);
539 addr1 = (void *) strtoul(xbt_dynar_get_as(s_tokens1, 1, char *), NULL, 16);
540 addr2 = (void *) strtoul(xbt_dynar_get_as(s_tokens2, 1, char *), NULL, 16);
541 if(is_heap_equality(heap_equals, addr1, addr2) == 0){
542 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
543 XBT_VERB("Variable %s is different between stacks : %s - %s", xbt_dynar_get_as(s_tokens1, 0, char *), xbt_dynar_get_as(s_tokens1, 1, char *), xbt_dynar_get_as(s_tokens2, 1, char *));
544 xbt_dynar_free(&s_tokens1);
545 xbt_dynar_free(&s_tokens2);
550 xbt_dynar_free(&s_tokens1);
551 xbt_dynar_free(&s_tokens2);
555 xbt_dynar_free(&tokens1);
556 xbt_dynar_free(&tokens2);
561 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
563 unsigned int cursor = 0;
565 int end = xbt_dynar_length(equals) - 1;
566 heap_equality_t current_equality;
569 cursor = (start + end) / 2;
570 current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
571 if(current_equality->address1 == a1){
572 if(current_equality->address2 == a2)
574 if(current_equality->address2 < a2)
576 if(current_equality->address2 > a2)
579 if(current_equality->address1 < a1)
581 if(current_equality->address1 > a1)
590 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, void *heap1, void *heap2, xbt_dynar_t equals){
593 size_t size_used1 = s1->size - ((char*)sp1 - (char*)s1->address);
594 size_t size_used2 = s2->size - ((char*)sp2 - (char*)s2->address);
597 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
599 while(k < size_used1){
600 if(memcmp((char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k, 1) != 0){
601 pointer_align = ((size_used1 - k) / sizeof(void*)) * sizeof(void*);
602 addr_pointed1 = *((void **)(((char*)s1->address + (s1->size - size_used1)) + pointer_align));
603 addr_pointed2 = *((void **)(((char*)s2->address + (s2->size - size_used2)) + pointer_align));
604 if(is_heap_equality(equals, addr_pointed1, addr_pointed2) == 0){
605 if((addr_pointed1 > std_heap) && (addr_pointed1 < (void *)((char *)std_heap + STD_HEAP_SIZE)) && (addr_pointed2 > std_heap) && (addr_pointed2 < (void *)((char *)std_heap + STD_HEAP_SIZE))){
606 if(is_free_area(addr_pointed1, (xbt_mheap_t)heap1) == 0 || is_free_area(addr_pointed2, (xbt_mheap_t)heap2) == 0){
620 int MC_compare_snapshots(void *s1, void *s2){
622 return simcall_mc_compare_snapshots(s1, s2);