+/* Copyright (c) 2008-2012 Da SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "mc_private.h"
+
+#include "xbt/mmalloc.h"
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, mc,
+ "Logging specific to mc_compare");
+
+static int data_program_region_compare(void *d1, void *d2, size_t size);
+static int data_libsimgrid_region_compare(void *d1, void *d2, size_t size);
+static int heap_region_compare(void *d1, void *d2, size_t size);
+
+static int compare_local_variables(xbt_strbuff_t s1, xbt_strbuff_t s2);
+static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, xbt_dynar_t equals);
+static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2);
+
+static int data_program_region_compare(void *d1, void *d2, size_t size){
+ int distance = 0;
+ size_t i = 0;
+
+ for(i=0; i<size; i++){
+ if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
+ XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in data program region", i, (char *)d1 + i, (char *)d2 + i);
+ distance++;
+ }
+ }
+
+ XBT_DEBUG("Hamming distance between data program regions : %d", distance);
+
+ return distance;
+}
+
+static int data_libsimgrid_region_compare(void *d1, void *d2, size_t size){
+ int distance = 0;
+ size_t i = 0;
+ int pointer_align;
+ void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
+
+ for(i=0; i<size; i++){
+ if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
+ pointer_align = (i / sizeof(void*)) * sizeof(void*);
+ addr_pointed1 = *((void **)((char *)d1 + pointer_align));
+ addr_pointed2 = *((void **)((char *)d2 + pointer_align));
+ if((addr_pointed1 > start_plt && addr_pointed1 < end_plt) || (addr_pointed2 > start_plt && addr_pointed2 < end_plt)){
+ continue;
+ }else{
+ XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in data libsimgrid region", i, (char *)d1 + i, (char *)d2 + i);
+ XBT_DEBUG("Addresses pointed : %p - %p\n", addr_pointed1, addr_pointed2);
+ distance++;
+ }
+ }
+ }
+
+ XBT_DEBUG("Hamming distance between data libsimgrid regions : %d", distance); fflush(NULL);
+
+ return distance;
+}
+
+static int heap_region_compare(void *d1, void *d2, size_t size){
+
+ int distance = 0;
+ size_t i = 0;
+
+ for(i=0; i<size; i++){
+ if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
+ XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in heap region", i, (char *)d1 + i, (char *)d2 + i);
+ distance++;
+ }
+ }
+
+ XBT_DEBUG("Hamming distance between heap regions : %d (total size : %zu)", distance, size);
+
+ return distance;
+}
+
+int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
+
+ int errors = 0, i;
+ xbt_dynar_t stacks1 = xbt_dynar_new(sizeof(stack_region_t), NULL);
+ xbt_dynar_t stacks2 = xbt_dynar_new(sizeof(stack_region_t), NULL);
+ xbt_dynar_t equals = xbt_dynar_new(sizeof(heap_equality_t), NULL);
+
+ if(s1->num_reg != s2->num_reg){
+ XBT_DEBUG("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
+ return 1;
+ }
+
+ for(i=0 ; i< s1->num_reg ; i++){
+
+ if(s1->regions[i]->type != s2->regions[i]->type){
+ XBT_INFO("Different type of region");
+ errors++;
+ }
+
+ switch(s1->regions[i]->type){
+ case 0 :
+ /* Compare heapregion */
+ if(s1->regions[i]->size != s2->regions[i]->size){
+ XBT_DEBUG("Different size of heap (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
+ return 1;
+ }
+ if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
+ XBT_DEBUG("Different start addr of heap (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
+ return 1;
+ }
+ if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[i]->data, (xbt_mheap_t)s2->regions[i]->data, &stacks1, &stacks2, &equals)){
+ XBT_DEBUG("Different heap (mmalloc_compare)");
+ return 1;
+ }
+ break;
+ case 1 :
+ /* Compare data libsimgrid region */
+ if(s1->regions[i]->size != s2->regions[i]->size){
+ XBT_DEBUG("Different size of libsimgrid (data) (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
+ return 1;
+ }
+ if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
+ XBT_DEBUG("Different start addr of libsimgrid (data) (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
+ return 1;
+ }
+ if(data_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
+ XBT_DEBUG("Different memcmp for data in libsimgrid");
+ return 1;
+ }
+ break;
+
+ case 2 :
+ /* Compare data program region */
+ if(s1->regions[i]->size != s2->regions[i]->size){
+ XBT_DEBUG("Different size of data program (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
+ return 1;
+ }
+ if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
+ XBT_DEBUG("Different start addr of data program (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
+ return 1;
+ }
+ if(data_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
+ XBT_DEBUG("Different memcmp for data in program");
+ return 1;
+ }
+ break;
+
+ }
+
+ }
+
+ /* Stacks comparison */
+ unsigned int cursor = 1;
+ stack_region_t stack_region1, stack_region2;
+ void *stack_pointer1, *stack_pointer2;
+
+ while(cursor < xbt_dynar_length(stacks1)){
+ stack_region1 = (stack_region_t)(xbt_dynar_get_as(stacks1, cursor, stack_region_t));
+ stack_region2 = (stack_region_t)(xbt_dynar_get_as(stacks2, cursor, stack_region_t));
+ stack_pointer1 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
+ stack_pointer2 = ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->stack_pointer;
+ if(compare_stack(stack_region1, stack_region2, stack_pointer1, stack_pointer2, equals) > 0)
+ return 1;
+ cursor++;
+ }
+
+ return 0;
+
+}
+
+static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
+
+ unsigned int cursor = 0;
+ int start = 0;
+ int end = xbt_dynar_length(equals) - 1;
+ heap_equality_t current_equality;
+
+ while(start <= end){
+ cursor = (start + end) / 2;
+ current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
+ if(current_equality->address1 == a1){
+ if(current_equality->address2 == a2)
+ return 1;
+ if(current_equality->address2 < a2)
+ start = cursor + 1;
+ if(current_equality->address2 > a2)
+ end = cursor - 1;
+ }
+ if(current_equality->address1 < a1)
+ start = cursor + 1;
+ if(current_equality->address1 > a1)
+ end = cursor - 1;
+ }
+
+ return 0;
+
+}
+
+
+static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, xbt_dynar_t equals){
+
+ int k = 0, nb_diff = 0;
+ long size_used1 = (long)s1->size - (long)((char*)sp1 - (char*)s1->address);
+ long size_used2 = (long)s2->size - (long)((char*)sp2 - (char*)s2->address);
+
+ int pointer_align;
+ void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
+
+ if(size_used1 == size_used2){
+
+ while(k < size_used1){
+ if(memcmp((char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k, 1) != 0){
+ pointer_align = ((size_used1 - k) / sizeof(void*)) * sizeof(void*);
+ addr_pointed1 = *((void **)(((char*)s1->address + (s1->size - size_used1)) + pointer_align));
+ addr_pointed2 = *((void **)(((char*)s2->address + (s2->size - size_used2)) + pointer_align));
+ if(is_heap_equality(equals, addr_pointed1, addr_pointed2) == 0){
+ XBT_DEBUG("Difference at offset %d (%p - %p)", k, (char *)s1->address + s1->size - k, (char *)s2->address + s2->size - k);
+ nb_diff++;
+ }
+ }
+ k++;
+ }
+
+ }else{
+ XBT_DEBUG("Different size used between stacks");
+ return 1;
+ }
+
+ return nb_diff;
+}
+
+static int compare_local_variables(xbt_strbuff_t s1, xbt_strbuff_t s2){
+
+ if(strcmp(s1->data, s2->data) != 0){
+ XBT_DEBUG("%s", s1->data);
+ XBT_DEBUG("%s", s2->data);
+ return 1;
+ }
+
+ return 0;
+}