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, 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 if(s1->num_reg != s2->num_reg){
88 XBT_DEBUG("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
92 for(i=0 ; i< s1->num_reg ; i++){
94 if(s1->regions[i]->type != s2->regions[i]->type){
95 XBT_INFO("Different type of region");
99 switch(s1->regions[i]->type){
101 /* Compare heapregion */
102 if(s1->regions[i]->size != s2->regions[i]->size){
103 XBT_DEBUG("Different size of heap (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
106 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
107 XBT_DEBUG("Different start addr of heap (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
110 if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[i]->data, (xbt_mheap_t)s2->regions[i]->data, &stacks1, &stacks2, &equals)){
111 XBT_DEBUG("Different heap (mmalloc_compare)");
116 /* Compare data libsimgrid region */
117 if(s1->regions[i]->size != s2->regions[i]->size){
118 XBT_DEBUG("Different size of libsimgrid (data) (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
121 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
122 XBT_DEBUG("Different start addr of libsimgrid (data) (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
125 if(data_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
126 XBT_DEBUG("Different memcmp for data in libsimgrid");
132 /* Compare data program region */
133 if(s1->regions[i]->size != s2->regions[i]->size){
134 XBT_DEBUG("Different size of data program (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
137 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
138 XBT_DEBUG("Different start addr of data program (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
141 if(data_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
142 XBT_DEBUG("Different memcmp for data in program");
151 /* Stacks comparison */
152 unsigned int cursor = 1;
153 stack_region_t stack_region1, stack_region2;
154 void *stack_pointer1, *stack_pointer2;
156 while(cursor < xbt_dynar_length(stacks1)){
157 stack_region1 = (stack_region_t)(xbt_dynar_get_as(stacks1, cursor, stack_region_t));
158 stack_region2 = (stack_region_t)(xbt_dynar_get_as(stacks2, cursor, stack_region_t));
159 stack_pointer1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
160 stack_pointer2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
161 if(compare_stack(stack_region1, stack_region2, stack_pointer1, stack_pointer2, equals) > 0)
170 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
172 unsigned int cursor = 0;
174 int end = xbt_dynar_length(equals) - 1;
175 heap_equality_t current_equality;
178 cursor = (start + end) / 2;
179 current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
180 if(current_equality->address1 == a1){
181 if(current_equality->address2 == a2)
183 if(current_equality->address2 < a2)
185 if(current_equality->address2 > a2)
188 if(current_equality->address1 < a1)
190 if(current_equality->address1 > a1)
199 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, xbt_dynar_t equals){
201 int k = 0, nb_diff = 0;
202 long size_used1 = (long)s1->size - (long)((char*)sp1 - (char*)s1->address);
203 long size_used2 = (long)s2->size - (long)((char*)sp2 - (char*)s2->address);
206 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
208 if(size_used1 == size_used2){
210 while(k < size_used1){
211 if(memcmp((char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k, 1) != 0){
212 pointer_align = ((size_used1 - k) / sizeof(void*)) * sizeof(void*);
213 addr_pointed1 = *((void **)(((char*)s1->address + (s1->size - size_used1)) + pointer_align));
214 addr_pointed2 = *((void **)(((char*)s2->address + (s2->size - size_used2)) + pointer_align));
215 if(is_heap_equality(equals, addr_pointed1, addr_pointed2) == 0){
216 XBT_DEBUG("Difference at offset %d (%p - %p)", k, (char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k);
224 XBT_DEBUG("Different size used between stacks");
231 static int compare_local_variables(xbt_strbuff_t s1, xbt_strbuff_t s2){
233 if(strcmp(s1->data, s2->data) != 0){
234 XBT_DEBUG("%s", s1->data);
235 XBT_DEBUG("%s", s2->data);