1 /* Copyright (c) 2012-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "mc_private.h"
11 #include "xbt/mmalloc.h"
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, mc,
14 "Logging specific to mc_compare");
16 typedef struct s_pointers_pair{
19 }s_pointers_pair_t, *pointers_pair_t;
21 __thread xbt_dynar_t compared_pointers;
23 /************************** Free functions ****************************/
24 /********************************************************************/
26 static void stack_region_free(stack_region_t s){
28 xbt_free(s->process_name);
33 static void stack_region_free_voidp(void *s){
34 stack_region_free((stack_region_t) * (void **) s);
37 static void pointers_pair_free(pointers_pair_t p){
41 static void pointers_pair_free_voidp(void *p){
42 pointers_pair_free((pointers_pair_t) * (void **)p);
45 /************************** Snapshot comparison *******************************/
46 /******************************************************************************/
48 /** \brief Try to add a pair a compared pointers to the set of compared pointers
50 * \result !=0 if the pointers were added (they were not in the set),
51 * 0 otherwise (they were already in the set)
53 static int add_compared_pointers(void *p1, void *p2){
55 pointers_pair_t new_pair = xbt_new0(s_pointers_pair_t, 1);
59 if(xbt_dynar_is_empty(compared_pointers)){
60 xbt_dynar_push(compared_pointers, &new_pair);
64 unsigned int cursor = 0;
66 int end = xbt_dynar_length(compared_pointers) - 1;
67 pointers_pair_t pair = NULL;
69 pointers_pair_t* p = (pointers_pair_t*) xbt_dynar_get_ptr(compared_pointers, 0);
72 cursor = (start + end) / 2;
76 } else if(pair->p1 > p1) {
78 } else if(pair->p2 < p2){
80 } else if(pair->p2 > p2) {
83 pointers_pair_free(new_pair);
89 xbt_dynar_insert_at(compared_pointers, cursor + 1, &new_pair);
90 else if(pair->p1 > p1)
91 xbt_dynar_insert_at(compared_pointers, cursor, &new_pair);
92 else if(pair->p2 < p2)
93 xbt_dynar_insert_at(compared_pointers, cursor + 1, &new_pair);
94 else if(pair->p2 > p2)
95 xbt_dynar_insert_at(compared_pointers, cursor, &new_pair);
97 xbt_die("Unrecheable");
102 static int compare_areas_with_type(void *area1, void *area2, mc_snapshot_t snapshot1, mc_snapshot_t snapshot2, mc_object_info_t info, mc_object_info_t other_info, dw_type_t type, int region_size, int region_type, void *start_data, int pointer_level){
104 unsigned int cursor = 0;
105 dw_type_t member, subtype, subsubtype;
106 int elm_size, i, res, switch_types = 0;
107 void *addr_pointed1, *addr_pointed2;
110 case DW_TAG_unspecified_type:
113 case DW_TAG_base_type:
114 case DW_TAG_enumeration_type:
115 case DW_TAG_union_type:
116 return (memcmp(area1, area2, type->byte_size) != 0);
119 case DW_TAG_volatile_type:
120 case DW_TAG_const_type:
121 return compare_areas_with_type(area1, area2, snapshot1, snapshot2, info, other_info, type->subtype, region_size, region_type, start_data, pointer_level);
123 case DW_TAG_array_type:
124 subtype = type->subtype;
125 switch(subtype->type){
126 case DW_TAG_unspecified_type:
129 case DW_TAG_base_type:
130 case DW_TAG_enumeration_type:
131 case DW_TAG_pointer_type:
132 case DW_TAG_reference_type:
133 case DW_TAG_rvalue_reference_type:
134 case DW_TAG_structure_type:
135 case DW_TAG_class_type:
136 case DW_TAG_union_type:
137 if(subtype->byte_size == 0){ /*declaration of the type, need the complete description */
138 subtype = subtype->other_object_same_type;
141 elm_size = subtype->byte_size;
143 case DW_TAG_const_type:
145 case DW_TAG_volatile_type:
146 subsubtype = subtype->subtype;
147 if(subsubtype->byte_size == 0){ /*declaration of the type, need the complete description */
148 subsubtype = subsubtype->other_object_same_type;
151 elm_size = subsubtype->byte_size;
157 for(i=0; i<type->element_count; i++){
159 res = compare_areas_with_type((char *)area1 + (i*elm_size), (char *)area2 + (i*elm_size), snapshot1, snapshot2, other_info, info, type->subtype, region_size, region_type, start_data, pointer_level);
161 res = compare_areas_with_type((char *)area1 + (i*elm_size), (char *)area2 + (i*elm_size), snapshot1, snapshot2, info, other_info, type->subtype, region_size, region_type, start_data, pointer_level);
166 case DW_TAG_pointer_type:
167 case DW_TAG_reference_type:
168 case DW_TAG_rvalue_reference_type:
170 addr_pointed1 = *((void **)(area1));
171 addr_pointed2 = *((void **)(area2));
173 if(type->subtype && type->subtype->type == DW_TAG_subroutine_type){
174 return (addr_pointed1 != addr_pointed2);
177 if(addr_pointed1 == NULL && addr_pointed2 == NULL)
179 if(!add_compared_pointers(addr_pointed1, addr_pointed2))
184 // Some cases are not handled here:
185 // * the pointers lead to different areas (one to the heap, the other to the RW segment ...);
186 // * a pointer leads to the read-only segment of the current object;
187 // * a pointer lead to a different ELF object.
189 // The pointers are both in the heap:
190 if(addr_pointed1 > std_heap && (char *)addr_pointed1 < (char*) std_heap + STD_HEAP_SIZE){
191 if(!(addr_pointed2 > std_heap && (char *)addr_pointed2 < (char*) std_heap + STD_HEAP_SIZE))
193 return compare_heap_area(addr_pointed1, addr_pointed2, snapshot1, snapshot2, NULL, info, other_info, type->dw_type_id, pointer_level);
196 // The pointers are both in the current object R/W segment:
197 else if(addr_pointed1 > start_data && (char*)addr_pointed1 <= (char *)start_data + region_size){
198 if(!(addr_pointed2 > start_data && (char*)addr_pointed2 <= (char *)start_data + region_size))
200 if(type->dw_type_id == NULL)
201 return (addr_pointed1 != addr_pointed2);
203 void* translated_addr_pointer1 = mc_translate_address((uintptr_t)addr_pointed1, snapshot1);
204 void* translated_addr_pointer2 = mc_translate_address((uintptr_t)addr_pointed2, snapshot2);
205 return compare_areas_with_type(
206 translated_addr_pointer1, translated_addr_pointer2, snapshot1, snapshot2, info, other_info, type->subtype, region_size, region_type, start_data, pointer_level);
211 return (addr_pointed1 != addr_pointed2);
215 case DW_TAG_structure_type:
216 case DW_TAG_class_type:
217 xbt_dynar_foreach(type->members, cursor, member){
218 XBT_DEBUG("Compare member %s", member->name);
219 void* member1 = mc_member_snapshot_resolve(area1, type, member, snapshot1);
220 void* member2 = mc_member_snapshot_resolve(area2, type, member, snapshot2);
221 res = compare_areas_with_type(member1, member2, snapshot1, snapshot2, info, other_info, member->subtype, region_size, region_type, start_data, pointer_level);
226 case DW_TAG_subroutine_type:
230 XBT_VERB("Unknown case : %d", type->type);
237 static int compare_global_variables(int region_type, mc_mem_region_t r1, mc_mem_region_t r2, mc_snapshot_t snapshot1, mc_snapshot_t snapshot2){
239 if(!compared_pointers){
240 compared_pointers = xbt_dynar_new(sizeof(pointers_pair_t), pointers_pair_free_voidp);
242 xbt_dynar_reset(compared_pointers);
245 xbt_dynar_t variables;
247 unsigned int cursor = 0;
248 dw_variable_t current_var;
251 void* start_data_binary = mc_binary_info->start_rw;
252 void* start_data_libsimgrid = mc_libsimgrid_info->start_rw;
254 mc_object_info_t object_info = NULL;
255 mc_object_info_t other_object_info = NULL;
256 if(region_type == 2){
257 object_info = mc_binary_info;
258 other_object_info = mc_libsimgrid_info;
259 start_data = start_data_binary;
261 object_info = mc_libsimgrid_info;
262 other_object_info = mc_binary_info;
263 start_data = start_data_libsimgrid;
265 variables = object_info->global_variables;
267 xbt_dynar_foreach(variables, cursor, current_var){
269 // If the variable is not in this object, skip it:
270 // We do not expect to find a pointer to something which is not reachable
271 // by the global variables.
272 if((char*) current_var->address < (char*) object_info->start_rw
273 || (char*) current_var->address > (char*) object_info->end_rw)
276 offset = (char *)current_var->address - (char *)object_info->start_rw;
278 dw_type_t bvariable_type = current_var->type;
279 res = compare_areas_with_type((char *)r1->data + offset, (char *)r2->data + offset, snapshot1, snapshot2, object_info, other_object_info, bvariable_type, r1->size, region_type, start_data, 0);
281 XBT_VERB("Global variable %s (%p - %p) is different between snapshots", current_var->name, (char *)r1->data + offset, (char *)r2->data + offset);
282 xbt_dynar_free(&compared_pointers);
283 compared_pointers = NULL;
289 xbt_dynar_free(&compared_pointers);
290 compared_pointers = NULL;
296 static int compare_local_variables(mc_snapshot_t snapshot1, mc_snapshot_t snapshot2, mc_snapshot_stack_t stack1, mc_snapshot_stack_t stack2, void *heap1, void *heap2){
297 void* start_data_binary = mc_binary_info->start_rw;
298 void* start_data_libsimgrid = mc_libsimgrid_info->start_rw;
300 if(!compared_pointers){
301 compared_pointers = xbt_dynar_new(sizeof(pointers_pair_t), pointers_pair_free_voidp);
303 xbt_dynar_reset(compared_pointers);
306 if(xbt_dynar_length(stack1->local_variables) != xbt_dynar_length(stack2->local_variables)){
307 XBT_VERB("Different number of local variables");
308 xbt_dynar_free(&compared_pointers);
309 compared_pointers = NULL;
312 unsigned int cursor = 0;
313 local_variable_t current_var1, current_var2;
314 int offset1, offset2, res;
315 while(cursor < xbt_dynar_length(stack1->local_variables)){
316 current_var1 = (local_variable_t)xbt_dynar_get_as(stack1->local_variables, cursor, local_variable_t);
317 current_var2 = (local_variable_t)xbt_dynar_get_as(stack2->local_variables, cursor, local_variable_t);
318 if(strcmp(current_var1->name, current_var2->name) != 0 || strcmp(current_var1->frame, current_var2->frame) != 0 || current_var1->ip != current_var2->ip){
319 xbt_dynar_free(&compared_pointers);
320 XBT_VERB("Different name of variable (%s - %s) or frame (%s - %s) or ip (%lu - %lu)", current_var1->name, current_var2->name, current_var1->frame, current_var2->frame, current_var1->ip, current_var2->ip);
323 offset1 = (char *)current_var1->address - (char *)std_heap;
324 offset2 = (char *)current_var2->address - (char *)std_heap;
325 XBT_DEBUG("Compare local variable %s of frame %s", current_var1->name, current_var1->frame);
328 if(current_var1->region == 1) {
329 dw_type_t subtype = current_var1->type;
330 res = compare_areas_with_type( (char *)heap1 + offset1, (char *)heap2 + offset2, snapshot1, snapshot2, mc_libsimgrid_info, mc_binary_info, subtype, 0, 1, start_data_libsimgrid, 0);
332 dw_type_t subtype = current_var2->type;
333 res = compare_areas_with_type( (char *)heap1 + offset1, (char *)heap2 + offset2, snapshot1, snapshot2, mc_binary_info, mc_libsimgrid_info, subtype, 0, 2, start_data_binary, 0);
336 XBT_VERB("Local variable %s (%p - %p) in frame %s is different between snapshots", current_var1->name,(char *)heap1 + offset1, (char *)heap2 + offset2, current_var1->frame);
337 xbt_dynar_free(&compared_pointers);
338 compared_pointers = NULL;
343 xbt_dynar_free(&compared_pointers);
344 compared_pointers = NULL;
349 int snapshot_compare(void *state1, void *state2){
351 mc_snapshot_t s1, s2;
354 if(_sg_mc_property_file && _sg_mc_property_file[0] != '\0'){ /* Liveness MC */
355 s1 = ((mc_visited_pair_t)state1)->graph_state->system_state;
356 s2 = ((mc_visited_pair_t)state2)->graph_state->system_state;
357 num1 = ((mc_visited_pair_t)state1)->num;
358 num2 = ((mc_visited_pair_t)state2)->num;
359 /* Firstly compare automaton state */
360 /*if(xbt_automaton_state_compare(((mc_pair_t)state1)->automaton_state, ((mc_pair_t)state2)->automaton_state) != 0)
362 if(xbt_automaton_propositional_symbols_compare_value(((mc_pair_t)state1)->atomic_propositions, ((mc_pair_t)state2)->atomic_propositions) != 0)
364 }else{ /* Safety MC */
365 s1 = ((mc_visited_state_t)state1)->system_state;
366 s2 = ((mc_visited_state_t)state2)->system_state;
367 num1 = ((mc_visited_state_t)state1)->num;
368 num2 = ((mc_visited_state_t)state2)->num;
374 xbt_os_timer_t global_timer = xbt_os_timer_new();
375 xbt_os_timer_t timer = xbt_os_timer_new();
377 xbt_os_walltimer_start(global_timer);
380 xbt_os_walltimer_start(timer);
385 hash_result = (s1->hash != s2->hash);
387 XBT_VERB("(%d - %d) Different hash : 0x%" PRIx64 "--0x%" PRIx64, num1, num2, s1->hash, s2->hash);
392 XBT_VERB("(%d - %d) Same hash : 0x%" PRIx64, num1, num2, s1->hash);
397 size_t size_used1, size_used2;
401 /* Compare size of stacks */
402 while(i < xbt_dynar_length(s1->stacks)){
403 size_used1 = s1->stack_sizes[i];
404 size_used2 = s2->stack_sizes[i];
405 if(size_used1 != size_used2){
408 xbt_os_walltimer_stop(timer);
409 mc_comp_times->stacks_sizes_comparison_time = xbt_os_timer_elapsed(timer);
411 XBT_DEBUG("(%d - %d) Different size used in stacks : %zu - %zu", num1, num2, size_used1, size_used2);
416 XBT_VERB("(%d - %d) Different size used in stacks : %zu - %zu", num1, num2, size_used1, size_used2);
419 xbt_os_walltimer_stop(timer);
420 xbt_os_timer_free(timer);
421 xbt_os_walltimer_stop(global_timer);
422 mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
423 xbt_os_timer_free(global_timer);
433 xbt_os_walltimer_stop(timer);
434 xbt_os_walltimer_start(timer);
437 /* Init heap information used in heap comparison algorithm */
438 res_init = init_heap_information((xbt_mheap_t)s1->regions[0]->data, (xbt_mheap_t)s2->regions[0]->data, s1->to_ignore, s2->to_ignore);
441 XBT_DEBUG("(%d - %d) Different heap information", num1, num2);
445 XBT_VERB("(%d - %d) Different heap information", num1, num2);
448 xbt_os_walltimer_stop(global_timer);
449 mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
450 xbt_os_timer_free(global_timer);
457 xbt_os_walltimer_start(timer);
460 /* Stacks comparison */
461 unsigned int cursor = 0;
464 mc_snapshot_stack_t stack1, stack2;
466 while(cursor < xbt_dynar_length(s1->stacks)){
467 stack1 = (mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t);
468 stack2 = (mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t);
469 diff_local = compare_local_variables(s1, s2, stack1, stack2, s1->regions[0]->data, s2->regions[0]->data);
473 xbt_os_walltimer_stop(timer);
474 mc_comp_times->stacks_comparison_time = xbt_os_timer_elapsed(timer);
476 XBT_DEBUG("(%d - %d) Different local variables between stacks %d", num1, num2, cursor + 1);
482 XBT_VERB("(%d - %d) Different local variables between stacks %d", num1, num2, cursor + 1);
485 reset_heap_information();
486 xbt_os_walltimer_stop(timer);
487 xbt_os_timer_free(timer);
488 xbt_os_walltimer_stop(global_timer);
489 mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
490 xbt_os_timer_free(global_timer);
500 const char* names[3] = { "?", "libsimgrid", "binary" };
504 &mc_comp_times->libsimgrid_global_variables_comparison_time,
505 &mc_comp_times->binary_global_variables_comparison_time
510 for(k=2; k!=0; --k) {
513 xbt_os_walltimer_stop(timer);
514 xbt_os_walltimer_start(timer);
517 /* Compare global variables */
518 is_diff = compare_global_variables(k, s1->regions[k], s2->regions[k], s1, s2);
521 xbt_os_walltimer_stop(timer);
522 *times[k] = xbt_os_timer_elapsed(timer);
523 XBT_DEBUG("(%d - %d) Different global variables in %s", num1, num2, names[k]);
527 XBT_VERB("(%d - %d) Different global variables in %s", num1, num2, names[k]);
530 reset_heap_information();
531 xbt_os_walltimer_stop(timer);
532 xbt_os_timer_free(timer);
533 xbt_os_walltimer_stop(global_timer);
534 mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
535 xbt_os_timer_free(global_timer);
543 xbt_os_walltimer_start(timer);
547 if(mmalloc_compare_heap(s1, s2, (xbt_mheap_t)s1->regions[0]->data,
548 (xbt_mheap_t)s2->regions[0]->data,
550 mc_binary_info) > 0){
553 xbt_os_walltimer_stop(timer);
554 mc_comp_times->heap_comparison_time = xbt_os_timer_elapsed(timer);
555 XBT_DEBUG("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
560 XBT_VERB("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
563 reset_heap_information();
564 xbt_os_walltimer_stop(timer);
565 xbt_os_timer_free(timer);
566 xbt_os_walltimer_stop(global_timer);
567 mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
568 xbt_os_timer_free(global_timer);
574 xbt_os_walltimer_stop(timer);
578 reset_heap_information();
580 xbt_os_walltimer_stop(timer);
581 xbt_os_timer_free(timer);
584 xbt_os_walltimer_stop(global_timer);
585 mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
588 xbt_os_timer_free(global_timer);
591 print_comparison_times();
595 if(errors || hash_result)
596 XBT_VERB("(%d - %d) Difference found", num1, num2);
598 XBT_VERB("(%d - %d) No difference found", num1, num2);
601 #if defined(MC_DEBUG) && defined(MC_VERBOSE)
603 // * false positive SHOULD be avoided.
604 // * There MUST not be any false negative.
606 XBT_VERB("(%d - %d) State equality hash test is %s %s", num1, num2,
607 (hash_result!=0) == (errors!=0) ? "true" : "false",
608 !hash_result ? "positive" : "negative");
612 return errors > 0 || hash_result;
616 /***************************** Statistics *****************************/
617 /*******************************************************************/
619 void print_comparison_times(){
620 XBT_DEBUG("*** Comparison times ***");
621 XBT_DEBUG("- Nb processes : %f", mc_comp_times->nb_processes_comparison_time);
622 XBT_DEBUG("- Nb bytes used : %f", mc_comp_times->bytes_used_comparison_time);
623 XBT_DEBUG("- Stacks sizes : %f", mc_comp_times->stacks_sizes_comparison_time);
624 XBT_DEBUG("- Binary global variables : %f", mc_comp_times->binary_global_variables_comparison_time);
625 XBT_DEBUG("- Libsimgrid global variables : %f", mc_comp_times->libsimgrid_global_variables_comparison_time);
626 XBT_DEBUG("- Heap : %f", mc_comp_times->heap_comparison_time);
627 XBT_DEBUG("- Stacks : %f", mc_comp_times->stacks_comparison_time);
630 /**************************** MC snapshot compare simcall **************************/
631 /***********************************************************************************/
633 int SIMIX_pre_mc_compare_snapshots(smx_simcall_t simcall,
634 mc_snapshot_t s1, mc_snapshot_t s2){
635 return snapshot_compare(s1, s2);
638 int MC_compare_snapshots(void *s1, void *s2){
640 return simcall_mc_compare_snapshots(s1, s2);