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 int raw_mem = (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);
183 int heap_index = 0, data_libsimgrid_index = 0, data_program_index = 0;
185 /* Get index of regions */
186 while(i < s1->num_reg){
187 switch(s1->regions[i]->type){
193 data_libsimgrid_index = i;
195 while( i < s1->num_reg && s1->regions[i]->type == 1)
199 data_program_index = i;
201 while( i < s1->num_reg && s1->regions[i]->type == 2)
208 ct1->nb_comparisons++;
210 ct2->nb_comparisons++;
212 xbt_os_timer_t global_timer = xbt_os_timer_new();
213 xbt_os_timer_t timer = xbt_os_timer_new();
215 xbt_os_timer_start(global_timer);
217 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
218 xbt_os_timer_start(timer);
220 /* Compare number of blocks/fragments used in each heap */
221 size_t chunks_used1 = mmalloc_get_chunks_used((xbt_mheap_t)s1->regions[heap_index]->data);
222 size_t chunks_used2 = mmalloc_get_chunks_used((xbt_mheap_t)s2->regions[heap_index]->data);
223 if(chunks_used1 != chunks_used2){
224 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
225 xbt_os_timer_stop(timer);
227 xbt_dynar_push_as(ct1->chunks_used_comparison_times, double, xbt_os_timer_elapsed(timer));
229 xbt_dynar_push_as(ct2->chunks_used_comparison_times, double, xbt_os_timer_elapsed(timer));
230 XBT_DEBUG("Different number of chunks used in each heap : %zu - %zu", chunks_used1, chunks_used2);
233 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
234 XBT_VERB("Different number of chunks used in each heap : %zu - %zu", chunks_used1, chunks_used2);
236 xbt_os_timer_free(timer);
237 xbt_os_timer_stop(global_timer);
239 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
241 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
242 xbt_os_timer_free(global_timer);
250 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
251 xbt_os_timer_stop(timer);
254 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
255 xbt_os_timer_start(timer);
257 /* Compare size of stacks */
258 unsigned int cursor = 0;
259 void *addr_stack1, *addr_stack2;
261 size_t size_used1, size_used2;
263 while(cursor < xbt_dynar_length(stacks_areas)){
264 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);
265 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);
266 sp1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
267 sp2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
268 size_used1 = ((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->size - ((char*)sp1 - (char*)addr_stack1);
269 size_used2 = ((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->size - ((char*)sp2 - (char*)addr_stack2);
270 if(size_used1 != size_used2){
271 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
273 xbt_os_timer_stop(timer);
275 xbt_dynar_push_as(ct1->stacks_sizes_comparison_times, double, xbt_os_timer_elapsed(timer));
277 xbt_dynar_push_as(ct2->stacks_sizes_comparison_times, double, xbt_os_timer_elapsed(timer));
279 XBT_DEBUG("Different size used in stacks : %zu - %zu", size_used1, size_used2);
283 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
284 XBT_VERB("Different size used in stacks : %zu - %zu", size_used1, size_used2);
286 xbt_os_timer_free(timer);
287 xbt_os_timer_stop(global_timer);
289 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
291 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
292 xbt_os_timer_free(global_timer);
303 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
305 xbt_os_timer_stop(timer);
306 xbt_os_timer_start(timer);
309 /* Compare program data segment(s) */
311 i = data_program_index;
312 while(i < s1->num_reg && s1->regions[i]->type == 2){
313 if(data_bss_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
314 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
316 xbt_os_timer_stop(timer);
318 xbt_dynar_push_as(ct1->program_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
320 xbt_dynar_push_as(ct2->program_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
322 XBT_DEBUG("Different memcmp for data in program");
326 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
327 XBT_VERB("Different memcmp for data in program");
329 xbt_os_timer_free(timer);
330 xbt_os_timer_stop(global_timer);
332 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
334 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
335 xbt_os_timer_free(global_timer);
345 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
347 xbt_os_timer_stop(timer);
348 xbt_os_timer_start(timer);
351 /* Compare libsimgrid data segment(s) */
353 i = data_libsimgrid_index;
354 while(i < s1->num_reg && s1->regions[i]->type == 1){
355 if(data_bss_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
356 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
358 xbt_os_timer_stop(timer);
360 xbt_dynar_push_as(ct1->libsimgrid_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
362 xbt_dynar_push_as(ct2->libsimgrid_data_segment_comparison_times, double, xbt_os_timer_elapsed(timer));
364 XBT_DEBUG("Different memcmp for data in libsimgrid");
368 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
369 XBT_VERB("Different memcmp for data in libsimgrid");
371 xbt_os_timer_free(timer);
372 xbt_os_timer_stop(global_timer);
374 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
376 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
377 xbt_os_timer_free(global_timer);
387 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
389 xbt_os_timer_stop(timer);
390 xbt_os_timer_start(timer);
394 xbt_dynar_t stacks1 = xbt_dynar_new(sizeof(stack_region_t), stack_region_free_voidp);
395 xbt_dynar_t stacks2 = xbt_dynar_new(sizeof(stack_region_t), stack_region_free_voidp);
396 xbt_dynar_t equals = xbt_dynar_new(sizeof(heap_equality_t), heap_equality_free_voidp);
398 void *heap1 = s1->regions[heap_index]->data, *heap2 = s2->regions[heap_index]->data;
400 if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[heap_index]->data, (xbt_mheap_t)s2->regions[heap_index]->data, &stacks1, &stacks2, &equals)){
402 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
403 xbt_os_timer_stop(timer);
405 xbt_dynar_push_as(ct1->heap_comparison_times, double, xbt_os_timer_elapsed(timer));
407 xbt_dynar_push_as(ct2->heap_comparison_times, double, xbt_os_timer_elapsed(timer));
408 XBT_DEBUG("Different heap (mmalloc_compare)");
412 xbt_os_timer_free(timer);
413 xbt_dynar_free(&stacks1);
414 xbt_dynar_free(&stacks2);
415 xbt_dynar_free(&equals);
417 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
418 XBT_VERB("Different heap (mmalloc_compare)");
420 xbt_os_timer_stop(global_timer);
422 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
424 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
425 xbt_os_timer_free(global_timer);
432 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
433 xbt_os_timer_stop(timer);
436 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
437 xbt_os_timer_start(timer);
439 /* Stacks comparison */
441 stack_region_t stack_region1, stack_region2;
442 int diff = 0, diff_local = 0;
445 while(cursor < xbt_dynar_length(stacks1)){
446 stack_region1 = (stack_region_t)(xbt_dynar_get_as(stacks1, cursor, stack_region_t));
447 stack_region2 = (stack_region_t)(xbt_dynar_get_as(stacks2, cursor, stack_region_t));
448 sp1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
449 sp2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
450 diff = compare_stack(stack_region1, stack_region2, sp1, sp2, heap1, heap2, equals);
452 if(diff > 0){ /* Differences may be due to padding */
453 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);
455 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
457 xbt_os_timer_stop(timer);
459 xbt_dynar_push_as(ct1->stacks_comparison_times, double, xbt_os_timer_elapsed(timer));
461 xbt_dynar_push_as(ct2->stacks_comparison_times, double, xbt_os_timer_elapsed(timer));
463 XBT_DEBUG("Different local variables between stacks %d", cursor + 1);
467 xbt_dynar_free(&stacks1);
468 xbt_dynar_free(&stacks2);
469 xbt_dynar_free(&equals);
471 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
472 XBT_VERB("Different local variables between stacks %d", cursor + 1);
474 xbt_os_timer_free(timer);
475 xbt_os_timer_stop(global_timer);
477 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
479 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
480 xbt_os_timer_free(global_timer);
492 xbt_dynar_free(&stacks1);
493 xbt_dynar_free(&stacks2);
494 xbt_dynar_free(&equals);
496 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
497 xbt_os_timer_free(timer);
499 if(!XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
500 xbt_os_timer_stop(global_timer);
502 xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
504 xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
506 xbt_os_timer_free(global_timer);
515 static int is_stack_ignore_variable(char *frame, char *var_name){
517 unsigned int cursor = 0;
519 int end = xbt_dynar_length(mc_stack_comparison_ignore) - 1;
520 mc_stack_ignore_variable_t current_var;
523 cursor = (start + end) / 2;
524 current_var = (mc_stack_ignore_variable_t)xbt_dynar_get_as(mc_stack_comparison_ignore, cursor, mc_stack_ignore_variable_t);
525 if(strcmp(current_var->frame, frame) == 0){
526 if(strcmp(current_var->var_name, var_name) == 0)
528 if(strcmp(current_var->var_name, var_name) < 0)
530 if(strcmp(current_var->var_name, var_name) > 0)
533 if(strcmp(current_var->frame, frame) < 0)
535 if(strcmp(current_var->frame, frame) > 0)
542 static int compare_local_variables(char *s1, char *s2, xbt_dynar_t heap_equals){
544 xbt_dynar_t tokens1 = xbt_str_split(s1, NULL);
545 xbt_dynar_t tokens2 = xbt_str_split(s2, NULL);
547 xbt_dynar_t s_tokens1, s_tokens2;
548 unsigned int cursor = 0;
550 char *ip1 = NULL, *ip2 = NULL;
552 while(cursor < xbt_dynar_length(tokens1)){
553 s_tokens1 = xbt_str_split(xbt_dynar_get_as(tokens1, cursor, char *), "=");
554 s_tokens2 = xbt_str_split(xbt_dynar_get_as(tokens2, cursor, char *), "=");
555 if(xbt_dynar_length(s_tokens1) > 1 && xbt_dynar_length(s_tokens2) > 1){
556 if((strcmp(xbt_dynar_get_as(s_tokens1, 0, char *), "ip") == 0) && (strcmp(xbt_dynar_get_as(s_tokens2, 0, char *), "ip") == 0)){
557 ip1 = strdup(xbt_dynar_get_as(s_tokens1, 1, char *));
558 ip2 = strdup(xbt_dynar_get_as(s_tokens2, 1, char *));
559 /*if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
560 XBT_VERB("Instruction pointer : %s, Instruction pointer : %s", ip1, ip2);*/
562 if(strcmp(xbt_dynar_get_as(s_tokens1, 1, char *), xbt_dynar_get_as(s_tokens2, 1, char *)) != 0){
563 /* Ignore this variable ? */
564 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 *))){
565 xbt_dynar_free(&s_tokens1);
566 xbt_dynar_free(&s_tokens2);
570 addr1 = (void *) strtoul(xbt_dynar_get_as(s_tokens1, 1, char *), NULL, 16);
571 addr2 = (void *) strtoul(xbt_dynar_get_as(s_tokens2, 1, char *), NULL, 16);
572 if(is_heap_equality(heap_equals, addr1, addr2) == 0){
573 if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
574 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 *));
575 xbt_dynar_free(&s_tokens1);
576 xbt_dynar_free(&s_tokens2);
581 xbt_dynar_free(&s_tokens1);
582 xbt_dynar_free(&s_tokens2);
586 xbt_dynar_free(&tokens1);
587 xbt_dynar_free(&tokens2);
592 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
594 unsigned int cursor = 0;
596 int end = xbt_dynar_length(equals) - 1;
597 heap_equality_t current_equality;
600 cursor = (start + end) / 2;
601 current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
602 if(current_equality->address1 == a1){
603 if(current_equality->address2 == a2)
605 if(current_equality->address2 < a2)
607 if(current_equality->address2 > a2)
610 if(current_equality->address1 < a1)
612 if(current_equality->address1 > a1)
621 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, void *heap1, void *heap2, xbt_dynar_t equals){
624 size_t size_used1 = s1->size - ((char*)sp1 - (char*)s1->address);
625 size_t size_used2 = s2->size - ((char*)sp2 - (char*)s2->address);
628 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
630 while(k < size_used1){
631 if(memcmp((char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k, 1) != 0){
632 pointer_align = ((size_used1 - k) / sizeof(void*)) * sizeof(void*);
633 addr_pointed1 = *((void **)(((char*)s1->address + (s1->size - size_used1)) + pointer_align));
634 addr_pointed2 = *((void **)(((char*)s2->address + (s2->size - size_used2)) + pointer_align));
635 if(is_heap_equality(equals, addr_pointed1, addr_pointed2) == 0){
636 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))){
637 if(is_free_area(addr_pointed1, (xbt_mheap_t)heap1) == 0 || is_free_area(addr_pointed2, (xbt_mheap_t)heap2) == 0){
651 int MC_compare_snapshots(void *s1, void *s2){
653 return simcall_mc_compare_snapshots(s1, s2);