-/* Copyright (c) 2012-2014. The 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 <inttypes.h>
-
-#include "mc_private.h"
-
-#include "xbt/mmalloc.h"
-#include "xbt/mmalloc/mmprivate.h"
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, mc,
- "Logging specific to mc_compare");
-
-typedef struct s_pointers_pair {
- void *p1;
- void *p2;
-} s_pointers_pair_t, *pointers_pair_t;
-
-__thread xbt_dynar_t compared_pointers;
-
-/************************** Free functions ****************************/
-/********************************************************************/
-
-static void stack_region_free(stack_region_t s)
-{
- if (s) {
- xbt_free(s->process_name);
- xbt_free(s);
- }
-}
-
-static void stack_region_free_voidp(void *s)
-{
- stack_region_free((stack_region_t) * (void **) s);
-}
-
-static void pointers_pair_free(pointers_pair_t p)
-{
- xbt_free(p);
-}
-
-static void pointers_pair_free_voidp(void *p)
-{
- pointers_pair_free((pointers_pair_t) * (void **) p);
-}
-
-/************************** Snapshot comparison *******************************/
-/******************************************************************************/
-
-/** \brief Try to add a pair a compared pointers to the set of compared pointers
- *
- * \result !=0 if the pointers were added (they were not in the set),
- * 0 otherwise (they were already in the set)
- */
-static int add_compared_pointers(void *p1, void *p2)
-{
-
- pointers_pair_t new_pair = xbt_new0(s_pointers_pair_t, 1);
- new_pair->p1 = p1;
- new_pair->p2 = p2;
-
- if (xbt_dynar_is_empty(compared_pointers)) {
- xbt_dynar_push(compared_pointers, &new_pair);
- return 1;
- }
-
- unsigned int cursor = 0;
- int start = 0;
- int end = xbt_dynar_length(compared_pointers) - 1;
- pointers_pair_t pair = NULL;
-
- pointers_pair_t *p =
- (pointers_pair_t *) xbt_dynar_get_ptr(compared_pointers, 0);
-
- while (start <= end) {
- cursor = (start + end) / 2;
- pair = p[cursor];
- if (pair->p1 < p1) {
- start = cursor + 1;
- } else if (pair->p1 > p1) {
- end = cursor - 1;
- } else if (pair->p2 < p2) {
- start = cursor + 1;
- } else if (pair->p2 > p2) {
- end = cursor - 1;
- } else {
- pointers_pair_free(new_pair);
- return 0;
- }
- }
-
- if (pair->p1 < p1)
- xbt_dynar_insert_at(compared_pointers, cursor + 1, &new_pair);
- else if (pair->p1 > p1)
- xbt_dynar_insert_at(compared_pointers, cursor, &new_pair);
- else if (pair->p2 < p2)
- xbt_dynar_insert_at(compared_pointers, cursor + 1, &new_pair);
- else if (pair->p2 > p2)
- xbt_dynar_insert_at(compared_pointers, cursor, &new_pair);
- else
- xbt_die("Unrecheable");
-
- return 1;
-}
-
-static int compare_areas_with_type(void* real_area1, mc_snapshot_t snapshot1, mc_mem_region_t region1,
- void* real_area2, mc_snapshot_t snapshot2, mc_mem_region_t region2,
- dw_type_t type, int pointer_level)
-{
- unsigned int cursor = 0;
- dw_type_t member, subtype, subsubtype;
- int elm_size, i, res;
-
- top:
- switch (type->type) {
- case DW_TAG_unspecified_type:
- return 1;
-
- case DW_TAG_base_type:
- case DW_TAG_enumeration_type:
- case DW_TAG_union_type:
- {
- void* data1 =
- mc_snapshot_read_region(real_area1, region1, alloca(type->byte_size), type->byte_size);
- void* data2 =
- mc_snapshot_read_region(real_area2, region1, alloca(type->byte_size), type->byte_size);
- return (memcmp(data1, data2, type->byte_size) != 0);
- break;
- }
- case DW_TAG_typedef:
- case DW_TAG_volatile_type:
- case DW_TAG_const_type:
- // Poor man's TCO:
- type = type->subtype;
- goto top;
- case DW_TAG_array_type:
- subtype = type->subtype;
- switch (subtype->type) {
- case DW_TAG_unspecified_type:
- return 1;
-
- case DW_TAG_base_type:
- case DW_TAG_enumeration_type:
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- case DW_TAG_union_type:
- if (subtype->full_type)
- subtype = subtype->full_type;
- elm_size = subtype->byte_size;
- break;
- case DW_TAG_const_type:
- case DW_TAG_typedef:
- case DW_TAG_volatile_type:
- subsubtype = subtype->subtype;
- if (subsubtype->full_type)
- subsubtype = subsubtype->full_type;
- elm_size = subsubtype->byte_size;
- break;
- default:
- return 0;
- break;
- }
- for (i = 0; i < type->element_count; i++) {
- size_t off = i * elm_size;
- res = compare_areas_with_type(
- (char*) real_area1 + off, snapshot1, region1,
- (char*) real_area2 + off, snapshot2, region2,
- type->subtype, pointer_level);
- if (res == 1)
- return res;
- }
- break;
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- {
- void* temp;
- void* addr_pointed1 = *(void**) mc_snapshot_read_region(real_area1, region1, &temp, sizeof(void**));
- void* addr_pointed2 = *(void**) mc_snapshot_read_region(real_area2, region2, &temp, sizeof(void**));
-
- if (type->subtype && type->subtype->type == DW_TAG_subroutine_type) {
- return (addr_pointed1 != addr_pointed2);
- } else {
-
- if (addr_pointed1 == NULL && addr_pointed2 == NULL)
- return 0;
- if (!add_compared_pointers(addr_pointed1, addr_pointed2))
- return 0;
-
- pointer_level++;
-
- // Some cases are not handled here:
- // * the pointers lead to different areas (one to the heap, the other to the RW segment ...);
- // * a pointer leads to the read-only segment of the current object;
- // * a pointer lead to a different ELF object.
-
- if (addr_pointed1 > std_heap
- && addr_pointed1 < mc_snapshot_get_heap_end(snapshot1)) {
- if (!
- (addr_pointed2 > std_heap
- && addr_pointed2 < mc_snapshot_get_heap_end(snapshot2)))
- return 1;
- // The pointers are both in the heap:
- return compare_heap_area(addr_pointed1, addr_pointed2, snapshot1,
- snapshot2, NULL, type->subtype, pointer_level);
- }
- // The pointers are both in the current object R/W segment:
- else if (addr_pointed1 > region1->start_addr
- && (char *) addr_pointed1 <= (char *) region1->start_addr + region1->size) {
- if (!
- (addr_pointed2 > region2->start_addr
- && (char *) addr_pointed2 <= (char *) region2->start_addr + region2->size))
- return 1;
- if (type->dw_type_id == NULL)
- return (addr_pointed1 != addr_pointed2);
- else {
- return compare_areas_with_type(addr_pointed1, snapshot1, region1,
- addr_pointed2, snapshot2, region2,
- type->subtype, pointer_level);
- }
- }
-
- else {
- return (addr_pointed1 != addr_pointed2);
- }
- }
- break;
- }
- case DW_TAG_structure_type:
- case DW_TAG_class_type:
- xbt_dynar_foreach(type->members, cursor, member) {
- void *member1 =
- mc_member_resolve(real_area1, type, member, snapshot1);
- void *member2 =
- mc_member_resolve(real_area2, type, member, snapshot2);
- mc_mem_region_t subregion1 = mc_get_region_hinted(member1, snapshot1, region1);
- mc_mem_region_t subregion2 = mc_get_region_hinted(member2, snapshot2, region2);
- res =
- compare_areas_with_type(member1, snapshot1, subregion1,
- member2, snapshot2, subregion2,
- member->subtype, pointer_level);
- if (res == 1)
- return res;
- }
- break;
- case DW_TAG_subroutine_type:
- return -1;
- break;
- default:
- XBT_VERB("Unknown case : %d", type->type);
- break;
- }
-
- return 0;
-}
-
-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)
-{
-
- if (!compared_pointers) {
- compared_pointers =
- xbt_dynar_new(sizeof(pointers_pair_t), pointers_pair_free_voidp);
- } else {
- xbt_dynar_reset(compared_pointers);
- }
-
- xbt_dynar_t variables;
- int res;
- unsigned int cursor = 0;
- dw_variable_t current_var;
-
- mc_object_info_t object_info = NULL;
- if (region_type == 2) {
- object_info = mc_binary_info;
- } else {
- object_info = mc_libsimgrid_info;
- }
- variables = object_info->global_variables;
-
- xbt_dynar_foreach(variables, cursor, current_var) {
-
- // If the variable is not in this object, skip it:
- // We do not expect to find a pointer to something which is not reachable
- // by the global variables.
- if ((char *) current_var->address < (char *) object_info->start_rw
- || (char *) current_var->address > (char *) object_info->end_rw)
- continue;
-
- dw_type_t bvariable_type = current_var->type;
- res =
- compare_areas_with_type((char *) current_var->address, snapshot1, r1,
- (char *) current_var->address, snapshot2, r2,
- bvariable_type, 0);
- if (res == 1) {
- XBT_VERB("Global variable %s (%p) is different between snapshots",
- current_var->name, (char *) current_var->address);
- xbt_dynar_free(&compared_pointers);
- compared_pointers = NULL;
- return 1;
- }
-
- }
-
- xbt_dynar_free(&compared_pointers);
- compared_pointers = NULL;
-
- return 0;
-
-}
-
-static int compare_local_variables(mc_snapshot_t snapshot1,
- mc_snapshot_t snapshot2,
- mc_snapshot_stack_t stack1,
- mc_snapshot_stack_t stack2)
-{
- if (!compared_pointers) {
- compared_pointers =
- xbt_dynar_new(sizeof(pointers_pair_t), pointers_pair_free_voidp);
- } else {
- xbt_dynar_reset(compared_pointers);
- }
-
- if (xbt_dynar_length(stack1->local_variables) !=
- xbt_dynar_length(stack2->local_variables)) {
- XBT_VERB("Different number of local variables");
- xbt_dynar_free(&compared_pointers);
- compared_pointers = NULL;
- return 1;
- } else {
- unsigned int cursor = 0;
- local_variable_t current_var1, current_var2;
- int res;
- while (cursor < xbt_dynar_length(stack1->local_variables)) {
- current_var1 =
- (local_variable_t) xbt_dynar_get_as(stack1->local_variables, cursor,
- local_variable_t);
- current_var2 =
- (local_variable_t) xbt_dynar_get_as(stack2->local_variables, cursor,
- local_variable_t);
- if (strcmp(current_var1->name, current_var2->name) != 0
- || current_var1->subprogram != current_var1->subprogram
- || current_var1->ip != current_var2->ip) {
- xbt_dynar_free(&compared_pointers);
- // TODO, fix current_varX->subprogram->name to include name if DW_TAG_inlined_subprogram
- XBT_VERB
- ("Different name of variable (%s - %s) or frame (%s - %s) or ip (%lu - %lu)",
- current_var1->name, current_var2->name,
- current_var1->subprogram->name, current_var2->subprogram->name,
- current_var1->ip, current_var2->ip);
- return 1;
- }
- // TODO, fix current_varX->subprogram->name to include name if DW_TAG_inlined_subprogram
-
- dw_type_t subtype = current_var1->type;
- res =
- compare_areas_with_type(current_var1->address, snapshot1, mc_get_snapshot_region(current_var1->address, snapshot1),
- current_var2->address, snapshot2, mc_get_snapshot_region(current_var2->address, snapshot2),
- subtype, 0);
-
- if (res == 1) {
- // TODO, fix current_varX->subprogram->name to include name if DW_TAG_inlined_subprogram
- XBT_VERB
- ("Local variable %s (%p - %p) in frame %s is different between snapshots",
- current_var1->name, current_var1->address, current_var2->address,
- current_var1->subprogram->name);
- xbt_dynar_free(&compared_pointers);
- compared_pointers = NULL;
- return res;
- }
- cursor++;
- }
- xbt_dynar_free(&compared_pointers);
- compared_pointers = NULL;
- return 0;
- }
-}
-
-int snapshot_compare(void *state1, void *state2)
-{
-
- mc_snapshot_t s1, s2;
- int num1, num2;
-
- if (_sg_mc_liveness) { /* Liveness MC */
- s1 = ((mc_visited_pair_t) state1)->graph_state->system_state;
- s2 = ((mc_visited_pair_t) state2)->graph_state->system_state;
- num1 = ((mc_visited_pair_t) state1)->num;
- num2 = ((mc_visited_pair_t) state2)->num;
- } else { /* Safety or comm determinism MC */
- s1 = ((mc_visited_state_t) state1)->system_state;
- s2 = ((mc_visited_state_t) state2)->system_state;
- num1 = ((mc_visited_state_t) state1)->num;
- num2 = ((mc_visited_state_t) state2)->num;
- }
-
- int errors = 0;
- int res_init;
-
- xbt_os_timer_t global_timer = xbt_os_timer_new();
- xbt_os_timer_t timer = xbt_os_timer_new();
-
- xbt_os_walltimer_start(global_timer);
-
-#ifdef MC_DEBUG
- xbt_os_walltimer_start(timer);
-#endif
-
- int hash_result = 0;
- if (_sg_mc_hash) {
- hash_result = (s1->hash != s2->hash);
- if (hash_result) {
- XBT_VERB("(%d - %d) Different hash : 0x%" PRIx64 "--0x%" PRIx64, num1,
- num2, s1->hash, s2->hash);
-#ifndef MC_DEBUG
- return 1;
-#endif
- } else {
- XBT_VERB("(%d - %d) Same hash : 0x%" PRIx64, num1, num2, s1->hash);
- }
- }
-
- /* Compare enabled processes */
- unsigned int cursor;
- int pid;
- xbt_dynar_foreach(s1->enabled_processes, cursor, pid){
- if(!xbt_dynar_member(s2->enabled_processes, &pid))
- XBT_VERB("(%d - %d) Different enabled processes", num1, num2);
- }
-
- int i = 0;
- size_t size_used1, size_used2;
- int is_diff = 0;
-
- /* Compare size of stacks */
- while (i < xbt_dynar_length(s1->stacks)) {
- size_used1 = s1->stack_sizes[i];
- size_used2 = s2->stack_sizes[i];
- if (size_used1 != size_used2) {
-#ifdef MC_DEBUG
- if (is_diff == 0) {
- xbt_os_walltimer_stop(timer);
- mc_comp_times->stacks_sizes_comparison_time =
- xbt_os_timer_elapsed(timer);
- }
- XBT_DEBUG("(%d - %d) Different size used in stacks : %zu - %zu", num1,
- num2, size_used1, size_used2);
- errors++;
- is_diff = 1;
-#else
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different size used in stacks : %zu - %zu", num1,
- num2, size_used1, size_used2);
-#endif
-
- xbt_os_walltimer_stop(timer);
- xbt_os_timer_free(timer);
- xbt_os_walltimer_stop(global_timer);
- mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
- xbt_os_timer_free(global_timer);
-
- return 1;
-#endif
- }
- i++;
- }
-
-#ifdef MC_DEBUG
- if (is_diff == 0)
- xbt_os_walltimer_stop(timer);
- xbt_os_walltimer_start(timer);
-#endif
-
- /* Init heap information used in heap comparison algorithm */
- xbt_mheap_t heap1 = (xbt_mheap_t) mc_snapshot_read(std_heap, s1,
- alloca(sizeof(struct mdesc)), sizeof(struct mdesc));
- xbt_mheap_t heap2 = (xbt_mheap_t) mc_snapshot_read(std_heap, s2,
- alloca(sizeof(struct mdesc)), sizeof(struct mdesc));
- res_init = init_heap_information(heap1, heap2, s1->to_ignore, s2->to_ignore);
- if (res_init == -1) {
-#ifdef MC_DEBUG
- XBT_DEBUG("(%d - %d) Different heap information", num1, num2);
- errors++;
-#else
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different heap information", num1, num2);
-#endif
-
- xbt_os_walltimer_stop(global_timer);
- mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
- xbt_os_timer_free(global_timer);
-
- return 1;
-#endif
- }
-#ifdef MC_DEBUG
- xbt_os_walltimer_start(timer);
-#endif
-
- /* Stacks comparison */
- cursor = 0;
- int diff_local = 0;
-#ifdef MC_DEBUG
- is_diff = 0;
-#endif
- mc_snapshot_stack_t stack1, stack2;
-
- while (cursor < xbt_dynar_length(s1->stacks)) {
- stack1 =
- (mc_snapshot_stack_t) xbt_dynar_get_as(s1->stacks, cursor,
- mc_snapshot_stack_t);
- stack2 =
- (mc_snapshot_stack_t) xbt_dynar_get_as(s2->stacks, cursor,
- mc_snapshot_stack_t);
- diff_local =
- compare_local_variables(s1, s2, stack1, stack2);
- if (diff_local > 0) {
-#ifdef MC_DEBUG
- if (is_diff == 0) {
- xbt_os_walltimer_stop(timer);
- mc_comp_times->stacks_comparison_time = xbt_os_timer_elapsed(timer);
- }
- XBT_DEBUG("(%d - %d) Different local variables between stacks %d", num1,
- num2, cursor + 1);
- errors++;
- is_diff = 1;
-#else
-
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different local variables between stacks %d", num1,
- num2, cursor + 1);
-#endif
-
- reset_heap_information();
- xbt_os_walltimer_stop(timer);
- xbt_os_timer_free(timer);
- xbt_os_walltimer_stop(global_timer);
- mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
- xbt_os_timer_free(global_timer);
-
- return 1;
-#endif
- }
- cursor++;
- }
-
-
-
- const char *names[3] = { "?", "libsimgrid", "binary" };
-#ifdef MC_DEBUG
- double *times[3] = {
- NULL,
- &mc_comp_times->libsimgrid_global_variables_comparison_time,
- &mc_comp_times->binary_global_variables_comparison_time
- };
-#endif
-
- int k = 0;
- for (k = 2; k != 0; --k) {
-#ifdef MC_DEBUG
- if (is_diff == 0)
- xbt_os_walltimer_stop(timer);
- xbt_os_walltimer_start(timer);
-#endif
-
- /* Compare global variables */
- is_diff =
- compare_global_variables(k, s1->regions[k], s2->regions[k], s1, s2);
- if (is_diff != 0) {
-#ifdef MC_DEBUG
- xbt_os_walltimer_stop(timer);
- *times[k] = xbt_os_timer_elapsed(timer);
- XBT_DEBUG("(%d - %d) Different global variables in %s", num1, num2,
- names[k]);
- errors++;
-#else
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different global variables in %s", num1, num2,
- names[k]);
-#endif
-
- reset_heap_information();
- xbt_os_walltimer_stop(timer);
- xbt_os_timer_free(timer);
- xbt_os_walltimer_stop(global_timer);
- mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
- xbt_os_timer_free(global_timer);
-
- return 1;
-#endif
- }
- }
-
-#ifdef MC_DEBUG
- xbt_os_walltimer_start(timer);
-#endif
-
- /* Compare heap */
- if (mmalloc_compare_heap(s1, s2) > 0) {
-
-#ifdef MC_DEBUG
- xbt_os_walltimer_stop(timer);
- mc_comp_times->heap_comparison_time = xbt_os_timer_elapsed(timer);
- XBT_DEBUG("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
- errors++;
-#else
-
-#ifdef MC_VERBOSE
- XBT_VERB("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
-#endif
-
- reset_heap_information();
- xbt_os_walltimer_stop(timer);
- xbt_os_timer_free(timer);
- xbt_os_walltimer_stop(global_timer);
- mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
- xbt_os_timer_free(global_timer);
-
- return 1;
-#endif
- } else {
-#ifdef MC_DEBUG
- xbt_os_walltimer_stop(timer);
-#endif
- }
-
- reset_heap_information();
-
- xbt_os_walltimer_stop(timer);
- xbt_os_timer_free(timer);
-
-#ifdef MC_VERBOSE
- xbt_os_walltimer_stop(global_timer);
- mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
-#endif
-
- xbt_os_timer_free(global_timer);
-
-#ifdef MC_DEBUG
- print_comparison_times();
-#endif
-
-#ifdef MC_VERBOSE
- if (errors || hash_result)
- XBT_VERB("(%d - %d) Difference found", num1, num2);
- else
- XBT_VERB("(%d - %d) No difference found", num1, num2);
-#endif
-
-#if defined(MC_DEBUG) && defined(MC_VERBOSE)
- if (_sg_mc_hash) {
- // * false positive SHOULD be avoided.
- // * There MUST not be any false negative.
-
- XBT_VERB("(%d - %d) State equality hash test is %s %s", num1, num2,
- (hash_result != 0) == (errors != 0) ? "true" : "false",
- !hash_result ? "positive" : "negative");
- }
-#endif
-
- return errors > 0 || hash_result;
-
-}
-
-/***************************** Statistics *****************************/
-/*******************************************************************/
-
-void print_comparison_times()
-{
- XBT_DEBUG("*** Comparison times ***");
- XBT_DEBUG("- Nb processes : %f", mc_comp_times->nb_processes_comparison_time);
- XBT_DEBUG("- Nb bytes used : %f", mc_comp_times->bytes_used_comparison_time);
- XBT_DEBUG("- Stacks sizes : %f", mc_comp_times->stacks_sizes_comparison_time);
- XBT_DEBUG("- Binary global variables : %f",
- mc_comp_times->binary_global_variables_comparison_time);
- XBT_DEBUG("- Libsimgrid global variables : %f",
- mc_comp_times->libsimgrid_global_variables_comparison_time);
- XBT_DEBUG("- Heap : %f", mc_comp_times->heap_comparison_time);
- XBT_DEBUG("- Stacks : %f", mc_comp_times->stacks_comparison_time);
-}
-
-/**************************** MC snapshot compare simcall **************************/
-/***********************************************************************************/
-
-int SIMIX_pre_mc_compare_snapshots(smx_simcall_t simcall,
- mc_snapshot_t s1, mc_snapshot_t s2)
-{
- return snapshot_compare(s1, s2);
-}
-
-int MC_compare_snapshots(void *s1, void *s2)
-{
-
- return simcall_mc_compare_snapshots(s1, s2);
-
-}
