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_program_region_compare(void *d1, void *d2, size_t size);
14 static int data_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_local_variables(xbt_strbuff_t s1, xbt_strbuff_t s2);
18 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, void *heap1, void *heap2, xbt_dynar_t equals);
19 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2);
21 static int data_program_region_compare(void *d1, void *d2, size_t size){
25 for(i=0; i<size; i++){
26 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
27 XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in data program region", i, (char *)d1 + i, (char *)d2 + i);
32 XBT_DEBUG("Hamming distance between data program regions : %d", distance);
37 static int data_libsimgrid_region_compare(void *d1, void *d2, size_t size){
41 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
43 for(i=0; i<size; i++){
44 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
45 pointer_align = (i / sizeof(void*)) * sizeof(void*);
46 addr_pointed1 = *((void **)((char *)d1 + pointer_align));
47 addr_pointed2 = *((void **)((char *)d2 + pointer_align));
48 if((addr_pointed1 > start_plt && addr_pointed1 < end_plt) || (addr_pointed2 > start_plt && addr_pointed2 < end_plt)){
51 XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in data libsimgrid region", i, (char *)d1 + i, (char *)d2 + i);
52 XBT_DEBUG("Addresses pointed : %p - %p\n", addr_pointed1, addr_pointed2);
58 XBT_DEBUG("Hamming distance between data libsimgrid regions : %d", distance); fflush(NULL);
63 static int heap_region_compare(void *d1, void *d2, size_t size){
68 for(i=0; i<size; i++){
69 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
70 XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in heap region", i, (char *)d1 + i, (char *)d2 + i);
75 XBT_DEBUG("Hamming distance between heap regions : %d (total size : %zu)", distance, size);
80 int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
83 xbt_dynar_t stacks1 = xbt_dynar_new(sizeof(stack_region_t), NULL);
84 xbt_dynar_t stacks2 = xbt_dynar_new(sizeof(stack_region_t), NULL);
85 xbt_dynar_t equals = xbt_dynar_new(sizeof(heap_equality_t), NULL);
87 void *heap1 = NULL, *heap2 = NULL;
89 if(s1->num_reg != s2->num_reg){
90 XBT_DEBUG("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
94 for(i=0 ; i< s1->num_reg ; i++){
96 if(s1->regions[i]->type != s2->regions[i]->type){
97 XBT_INFO("Different type of region");
101 switch(s1->regions[i]->type){
103 /* Compare heapregion */
104 if(s1->regions[i]->size != s2->regions[i]->size){
105 XBT_DEBUG("Different size of heap (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
108 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
109 XBT_DEBUG("Different start addr of heap (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
112 if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[i]->data, (xbt_mheap_t)s2->regions[i]->data, &stacks1, &stacks2, &equals)){
113 XBT_DEBUG("Different heap (mmalloc_compare)");
116 heap1 = s1->regions[i]->data;
117 heap2 = s2->regions[i]->data;
120 /* Compare data libsimgrid region */
121 if(s1->regions[i]->size != s2->regions[i]->size){
122 XBT_DEBUG("Different size of libsimgrid (data) (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
125 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
126 XBT_DEBUG("Different start addr of libsimgrid (data) (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
129 if(data_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
130 XBT_DEBUG("Different memcmp for data in libsimgrid");
136 /* Compare data program region */
137 if(s1->regions[i]->size != s2->regions[i]->size){
138 XBT_DEBUG("Different size of data program (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
141 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
142 XBT_DEBUG("Different start addr of data program (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
145 if(data_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
146 XBT_DEBUG("Different memcmp for data in program");
155 /* Stacks comparison */
156 unsigned int cursor = 1;
157 stack_region_t stack_region1, stack_region2;
161 while(cursor < xbt_dynar_length(stacks1)){
162 XBT_DEBUG("Stack %d", cursor + 1);
163 stack_region1 = (stack_region_t)(xbt_dynar_get_as(stacks1, cursor, stack_region_t));
164 stack_region2 = (stack_region_t)(xbt_dynar_get_as(stacks2, cursor, stack_region_t));
165 sp1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
166 sp2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
167 diff += compare_stack(stack_region1, stack_region2, sp1, sp2, heap1, heap2, equals);
171 XBT_DEBUG("Hamming distance between stacks : %d", diff);
179 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
181 unsigned int cursor = 0;
183 int end = xbt_dynar_length(equals) - 1;
184 heap_equality_t current_equality;
187 cursor = (start + end) / 2;
188 current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
189 if(current_equality->address1 == a1){
190 if(current_equality->address2 == a2)
192 if(current_equality->address2 < a2)
194 if(current_equality->address2 > a2)
197 if(current_equality->address1 < a1)
199 if(current_equality->address1 > a1)
208 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, void *heap1, void *heap2, xbt_dynar_t equals){
210 int k = 0, nb_diff = 0;
211 long size_used1 = (long)s1->size - (long)((char*)sp1 - (char*)s1->address);
212 long size_used2 = (long)s2->size - (long)((char*)sp2 - (char*)s2->address);
215 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
217 if(size_used1 == size_used2){
219 while(k < size_used1){
220 if(memcmp((char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k, 1) != 0){
221 pointer_align = ((size_used1 - k) / sizeof(void*)) * sizeof(void*);
222 addr_pointed1 = *((void **)(((char*)s1->address + (s1->size - size_used1)) + pointer_align));
223 addr_pointed2 = *((void **)(((char*)s2->address + (s2->size - size_used2)) + pointer_align));
224 if(is_heap_equality(equals, addr_pointed1, addr_pointed2) == 0){
225 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))){
226 if(is_free_area(addr_pointed1, (xbt_mheap_t)heap1) == 0 || is_free_area(addr_pointed2, (xbt_mheap_t)heap2) == 0){
227 XBT_DEBUG("Difference at offset %d (%p - %p)", k, (char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k);
231 XBT_DEBUG("Difference at offset %d (%p - %p)", k, (char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k);
240 XBT_DEBUG("Different size used between stacks");
247 static int compare_local_variables(xbt_strbuff_t s1, xbt_strbuff_t s2){
249 if(strcmp(s1->data, s2->data) != 0){
250 XBT_DEBUG("%s", s1->data);
251 XBT_DEBUG("%s", s2->data);