+++ /dev/null
-/* Copyright (c) 2011-2015. 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 <cstring>
-
-#include <algorithm>
-#include <memory>
-
-#include <unistd.h>
-#include <sys/wait.h>
-
-#include <xbt/automaton.h>
-#include <xbt/dynar.h>
-#include <xbt/dynar.hpp>
-#include <xbt/fifo.h>
-#include <xbt/log.h>
-#include <xbt/sysdep.h>
-
-#include "src/mc/mc_request.h"
-#include "src/mc/mc_liveness.h"
-#include "src/mc/mc_private.h"
-#include "src/mc/mc_record.h"
-#include "src/mc/mc_smx.h"
-#include "src/mc/Client.hpp"
-#include "src/mc/mc_private.h"
-#include "src/mc/mc_replay.h"
-#include "src/mc/mc_safety.h"
-#include "src/mc/mc_exit.h"
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_liveness, mc,
- "Logging specific to algorithms for liveness properties verification");
-
-/********* Global variables *********/
-
-xbt_dynar_t acceptance_pairs;
-
-/********* Static functions *********/
-
-namespace simgrid {
-namespace mc {
-
-static xbt_dynar_t visited_pairs;
-
-Pair::Pair() : num(++mc_stats->expanded_pairs),
- visited_pair_removed(_sg_mc_visited > 0 ? 0 : 1)
-{}
-
-Pair::~Pair() {
- if (this->visited_pair_removed)
- MC_state_delete(this->graph_state, 1);
-}
-
-static void show_stack_liveness(xbt_fifo_t stack)
-{
- int value;
- simgrid::mc::Pair* pair;
- xbt_fifo_item_t item;
- smx_simcall_t req;
- char *req_str = nullptr;
-
- for (item = xbt_fifo_get_last_item(stack);
- item; item = xbt_fifo_get_prev_item(item)) {
- pair = (simgrid::mc::Pair*) xbt_fifo_get_item_content(item);
- req = MC_state_get_executed_request(pair->graph_state, &value);
- if (req && req->call != SIMCALL_NONE) {
- req_str = simgrid::mc::request_to_string(req, value, simgrid::mc::RequestType::executed);
- XBT_INFO("%s", req_str);
- xbt_free(req_str);
- }
- }
-}
-
-static void dump_stack_liveness(xbt_fifo_t stack)
-{
- simgrid::mc::Pair* pair;
- while ((pair = (simgrid::mc::Pair*) xbt_fifo_pop(stack)) != nullptr)
- delete pair;
-}
-
-static simgrid::xbt::unique_ptr<s_xbt_dynar_t> get_atomic_propositions_values()
-{
- unsigned int cursor = 0;
- xbt_automaton_propositional_symbol_t ps = nullptr;
- simgrid::xbt::unique_ptr<s_xbt_dynar_t> values = simgrid::xbt::unique_ptr<s_xbt_dynar_t>(xbt_dynar_new(sizeof(int), nullptr));
- xbt_dynar_foreach(simgrid::mc::property_automaton->propositional_symbols, cursor, ps) {
- int res = xbt_automaton_propositional_symbol_evaluate(ps);
- xbt_dynar_push_as(values.get(), int, res);
- }
- return std::move(values);
-}
-
-static int snapshot_compare(simgrid::mc::VisitedPair* state1, simgrid::mc::VisitedPair* state2)
-{
- simgrid::mc::Snapshot* s1 = state1->graph_state->system_state;
- simgrid::mc::Snapshot* s2 = state2->graph_state->system_state;
- int num1 = state1->num;
- int num2 = state2->num;
- return snapshot_compare(num1, s1, num2, s2);
-}
-
-static simgrid::mc::VisitedPair* is_reached_acceptance_pair(simgrid::mc::Pair* pair)
-{
- auto acceptance_pairs = simgrid::xbt::range<simgrid::mc::VisitedPair*>(::acceptance_pairs);
- auto new_pair =
- std::unique_ptr<simgrid::mc::VisitedPair>(new VisitedPair(
- pair->num, pair->automaton_state, pair->atomic_propositions.get(),
- pair->graph_state));
- new_pair->acceptance_pair = 1;
-
- auto res = std::equal_range(acceptance_pairs.begin(), acceptance_pairs.end(),
- new_pair, simgrid::mc::DerefAndCompareByNbProcessesAndUsedHeap());
-
- if (pair->search_cycle == 1)
- for (auto i = res.first; i != res.second; ++i) {
- simgrid::mc::VisitedPair* pair_test = *i;
- if (xbt_automaton_state_compare(pair_test->automaton_state, new_pair->automaton_state) == 0) {
- if (xbt_automaton_propositional_symbols_compare_value(
- pair_test->atomic_propositions.get(),
- new_pair->atomic_propositions.get()) == 0) {
- if (snapshot_compare(pair_test, new_pair.get()) == 0) {
- XBT_INFO("Pair %d already reached (equal to pair %d) !", new_pair->num, pair_test->num);
- xbt_fifo_shift(mc_stack);
- if (dot_output != nullptr)
- fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, pair_test->num, initial_global_state->prev_req);
- return nullptr;
- }
- }
- }
- }
-
- auto new_raw_pair = new_pair.release();
- xbt_dynar_insert_at(
- ::acceptance_pairs, res.first - acceptance_pairs.begin(), &new_raw_pair);
- return new_raw_pair;
-}
-
-static void remove_acceptance_pair(int pair_num)
-{
- unsigned int cursor = 0;
- simgrid::mc::VisitedPair* pair_test = nullptr;
- int pair_found = 0;
-
- xbt_dynar_foreach(acceptance_pairs, cursor, pair_test)
- if (pair_test->num == pair_num) {
- pair_found = 1;
- break;
- }
-
- if(pair_found == 1) {
- xbt_dynar_remove_at(acceptance_pairs, cursor, &pair_test);
-
- pair_test->acceptance_removed = 1;
-
- if (_sg_mc_visited == 0 || pair_test->visited_removed == 1)
- delete pair_test;
-
- }
-}
-
-
-static int MC_automaton_evaluate_label(xbt_automaton_exp_label_t l,
- xbt_dynar_t atomic_propositions_values)
-{
-
- switch (l->type) {
- case 0:{
- int left_res = MC_automaton_evaluate_label(l->u.or_and.left_exp, atomic_propositions_values);
- int right_res = MC_automaton_evaluate_label(l->u.or_and.right_exp, atomic_propositions_values);
- return (left_res || right_res);
- }
- case 1:{
- int left_res = MC_automaton_evaluate_label(l->u.or_and.left_exp, atomic_propositions_values);
- int right_res = MC_automaton_evaluate_label(l->u.or_and.right_exp, atomic_propositions_values);
- return (left_res && right_res);
- }
- case 2:{
- int res = MC_automaton_evaluate_label(l->u.exp_not, atomic_propositions_values);
- return (!res);
- }
- case 3:{
- unsigned int cursor = 0;
- xbt_automaton_propositional_symbol_t p = nullptr;
- xbt_dynar_foreach(simgrid::mc::property_automaton->propositional_symbols, cursor, p) {
- if (std::strcmp(xbt_automaton_propositional_symbol_get_name(p), l->u.predicat) == 0)
- return (int) xbt_dynar_get_as(atomic_propositions_values, cursor, int);
- }
- return -1;
- }
- case 4:
- return 2;
- default:
- return -1;
- }
-}
-
-static void MC_pre_modelcheck_liveness(void)
-{
- simgrid::mc::Pair* initial_pair = nullptr;
- mc_model_checker->wait_for_requests();
- acceptance_pairs = xbt_dynar_new(sizeof(simgrid::mc::VisitedPair*), nullptr);
- if(_sg_mc_visited > 0)
- simgrid::mc::visited_pairs = xbt_dynar_new(sizeof(simgrid::mc::VisitedPair*), nullptr);
-
- initial_global_state->snapshot = simgrid::mc::take_snapshot(0);
- initial_global_state->prev_pair = 0;
-
- unsigned int cursor = 0;
- xbt_automaton_state_t automaton_state;
-
- xbt_dynar_foreach(simgrid::mc::property_automaton->states, cursor, automaton_state) {
- if (automaton_state->type == -1) { /* Initial automaton state */
-
- initial_pair = new Pair();
- initial_pair->automaton_state = automaton_state;
- initial_pair->graph_state = MC_state_new();
- initial_pair->atomic_propositions = get_atomic_propositions_values();
- initial_pair->depth = 1;
-
- /* Get enabled processes and insert them in the interleave set of the graph_state */
- for (auto& p : mc_model_checker->process().simix_processes())
- if (simgrid::mc::process_is_enabled(&p.copy))
- MC_state_interleave_process(initial_pair->graph_state, &p.copy);
-
- initial_pair->requests = MC_state_interleave_size(initial_pair->graph_state);
- initial_pair->search_cycle = 0;
-
- xbt_fifo_unshift(mc_stack, initial_pair);
- }
- }
-}
-
-static void MC_replay_liveness(xbt_fifo_t stack)
-{
- xbt_fifo_item_t item;
- simgrid::mc::Pair* pair = nullptr;
- mc_state_t state = nullptr;
- smx_simcall_t req = nullptr, saved_req = NULL;
- int value, depth = 1;
- char *req_str;
-
- XBT_DEBUG("**** Begin Replay ****");
-
- /* Intermediate backtracking */
- if(_sg_mc_checkpoint > 0) {
- item = xbt_fifo_get_first_item(stack);
- pair = (simgrid::mc::Pair*) xbt_fifo_get_item_content(item);
- if(pair->graph_state->system_state){
- simgrid::mc::restore_snapshot(pair->graph_state->system_state);
- return;
- }
- }
-
- /* Restore the initial state */
- simgrid::mc::restore_snapshot(initial_global_state->snapshot);
-
- /* Traverse the stack from the initial state and re-execute the transitions */
- for (item = xbt_fifo_get_last_item(stack);
- item != xbt_fifo_get_first_item(stack);
- item = xbt_fifo_get_prev_item(item)) {
-
- pair = (simgrid::mc::Pair*) xbt_fifo_get_item_content(item);
-
- state = (mc_state_t) pair->graph_state;
-
- if (pair->exploration_started) {
-
- saved_req = MC_state_get_executed_request(state, &value);
-
- if (saved_req != nullptr) {
- /* because we got a copy of the executed request, we have to fetch the
- real one, pointed by the request field of the issuer process */
- const smx_process_t issuer = MC_smx_simcall_get_issuer(saved_req);
- req = &issuer->simcall;
-
- /* Debug information */
- if (XBT_LOG_ISENABLED(mc_liveness, xbt_log_priority_debug)) {
- req_str = simgrid::mc::request_to_string(req, value, simgrid::mc::RequestType::simix);
- XBT_DEBUG("Replay (depth = %d) : %s (%p)", depth, req_str, state);
- xbt_free(req_str);
- }
-
- }
-
- simgrid::mc::handle_simcall(req, value);
- mc_model_checker->wait_for_requests();
- }
-
- /* Update statistics */
- mc_stats->visited_pairs++;
- mc_stats->executed_transitions++;
-
- depth++;
-
- }
-
- XBT_DEBUG("**** End Replay ****");
-}
-
-/**
- * \brief Checks whether a given pair has already been visited by the algorithm.
- */
-static
-int is_visited_pair(simgrid::mc::VisitedPair* visited_pair, simgrid::mc::Pair* pair)
-{
- if (_sg_mc_visited == 0)
- return -1;
-
- simgrid::mc::VisitedPair* new_visited_pair = nullptr;
- if (visited_pair == nullptr)
- new_visited_pair = new simgrid::mc::VisitedPair(
- pair->num, pair->automaton_state, pair->atomic_propositions.get(),
- pair->graph_state);
- else
- new_visited_pair = visited_pair;
-
- auto visited_pairs = simgrid::xbt::range<simgrid::mc::VisitedPair*>(simgrid::mc::visited_pairs);
-
- auto range = std::equal_range(visited_pairs.begin(), visited_pairs.end(),
- new_visited_pair, simgrid::mc::DerefAndCompareByNbProcessesAndUsedHeap());
-
- for (auto i = range.first; i != range.second; ++i) {
- simgrid::mc::VisitedPair* pair_test = *i;
- std::size_t cursor = i - visited_pairs.begin();
- if (xbt_automaton_state_compare(pair_test->automaton_state, new_visited_pair->automaton_state) == 0) {
- if (xbt_automaton_propositional_symbols_compare_value(
- pair_test->atomic_propositions.get(),
- new_visited_pair->atomic_propositions.get()) == 0) {
- if (snapshot_compare(pair_test, new_visited_pair) == 0) {
- if (pair_test->other_num == -1)
- new_visited_pair->other_num = pair_test->num;
- else
- new_visited_pair->other_num = pair_test->other_num;
- if (dot_output == nullptr)
- XBT_DEBUG("Pair %d already visited ! (equal to pair %d)", new_visited_pair->num, pair_test->num);
- else
- XBT_DEBUG("Pair %d already visited ! (equal to pair %d (pair %d in dot_output))", new_visited_pair->num, pair_test->num, new_visited_pair->other_num);
- xbt_dynar_remove_at(simgrid::mc::visited_pairs, cursor, &pair_test);
- xbt_dynar_insert_at(simgrid::mc::visited_pairs, cursor, &new_visited_pair);
- pair_test->visited_removed = 1;
- if (!pair_test->acceptance_pair
- || pair_test->acceptance_removed == 1)
- delete pair_test;
- return new_visited_pair->other_num;
- }
- }
- }
- }
-
- xbt_dynar_insert_at(simgrid::mc::visited_pairs, range.first - visited_pairs.begin(), &new_visited_pair);
-
- if ((ssize_t) visited_pairs.size() > _sg_mc_visited) {
- int min2 = mc_stats->expanded_pairs;
- unsigned int index2 = 0;
- for (std::size_t i = 0; i != (std::size_t) visited_pairs.size(); ++i) {
- simgrid::mc::VisitedPair* pair_test = visited_pairs[i];
- if (!mc_model_checker->is_important_snapshot(*pair_test->graph_state->system_state)
- && pair_test->num < min2) {
- index2 = i;
- min2 = pair_test->num;
- }
- }
- simgrid::mc::VisitedPair* pair_test = nullptr;
- xbt_dynar_remove_at(simgrid::mc::visited_pairs, index2, &pair_test);
- pair_test->visited_removed = 1;
- if (!pair_test->acceptance_pair || pair_test->acceptance_removed)
- delete pair_test;
- }
-
- return -1;
-}
-
-static int MC_modelcheck_liveness_main(void)
-{
- simgrid::mc::Pair* current_pair = nullptr;
- int value, res, visited_num = -1;
- smx_simcall_t req = nullptr;
- xbt_automaton_transition_t transition_succ = nullptr;
- int cursor = 0;
- simgrid::mc::Pair* next_pair = nullptr;
- simgrid::xbt::unique_ptr<s_xbt_dynar_t> prop_values;
- simgrid::mc::VisitedPair* reached_pair = nullptr;
-
- while(xbt_fifo_size(mc_stack) > 0){
-
- /* Get current pair */
- current_pair = (simgrid::mc::Pair*) xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack));
-
- /* Update current state in buchi automaton */
- simgrid::mc::property_automaton->current_state = current_pair->automaton_state;
-
- XBT_DEBUG("********************* ( Depth = %d, search_cycle = %d, interleave size = %d, pair_num = %d, requests = %d)",
- current_pair->depth, current_pair->search_cycle,
- MC_state_interleave_size(current_pair->graph_state), current_pair->num,
- current_pair->requests);
-
- if (current_pair->requests > 0) {
-
- if (current_pair->automaton_state->type == 1 && current_pair->exploration_started == 0) {
- /* If new acceptance pair, return new pair */
- if ((reached_pair = is_reached_acceptance_pair(current_pair)) == nullptr) {
- int counter_example_depth = current_pair->depth;
- XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
- XBT_INFO("| ACCEPTANCE CYCLE |");
- XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
- XBT_INFO("Counter-example that violates formula :");
- MC_record_dump_path(mc_stack);
- simgrid::mc::show_stack_liveness(mc_stack);
- simgrid::mc::dump_stack_liveness(mc_stack);
- MC_print_statistics(mc_stats);
- XBT_INFO("Counter-example depth : %d", counter_example_depth);
- return SIMGRID_MC_EXIT_LIVENESS;
- }
- }
-
- /* Pair already visited ? stop the exploration on the current path */
- if ((current_pair->exploration_started == 0)
- && (visited_num = simgrid::mc::is_visited_pair(
- reached_pair, current_pair)) != -1) {
-
- if (dot_output != nullptr){
- fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, visited_num, initial_global_state->prev_req);
- fflush(dot_output);
- }
-
- XBT_DEBUG("Pair already visited (equal to pair %d), exploration on the current path stopped.", visited_num);
- current_pair->requests = 0;
- goto backtracking;
-
- }else{
-
- req = MC_state_get_request(current_pair->graph_state, &value);
-
- if (dot_output != nullptr) {
- if (initial_global_state->prev_pair != 0 && initial_global_state->prev_pair != current_pair->num) {
- fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, current_pair->num, initial_global_state->prev_req);
- xbt_free(initial_global_state->prev_req);
- }
- initial_global_state->prev_pair = current_pair->num;
- initial_global_state->prev_req = simgrid::mc::request_get_dot_output(req, value);
- if (current_pair->search_cycle)
- fprintf(dot_output, "%d [shape=doublecircle];\n", current_pair->num);
- fflush(dot_output);
- }
-
- char* req_str = simgrid::mc::request_to_string(req, value, simgrid::mc::RequestType::simix);
- XBT_DEBUG("Execute: %s", req_str);
- xbt_free(req_str);
-
- /* Set request as executed */
- MC_state_set_executed_request(current_pair->graph_state, req, value);
-
- /* Update mc_stats */
- mc_stats->executed_transitions++;
- if(current_pair->exploration_started == 0)
- mc_stats->visited_pairs++;
-
- /* Answer the request */
- simgrid::mc::handle_simcall(req, value);
-
- /* Wait for requests (schedules processes) */
- mc_model_checker->wait_for_requests();
-
- current_pair->requests--;
- current_pair->exploration_started = 1;
-
- /* Get values of atomic propositions (variables used in the property formula) */
- prop_values = get_atomic_propositions_values();
-
- /* Evaluate enabled/true transitions in automaton according to atomic propositions values and create new pairs */
- cursor = xbt_dynar_length(current_pair->automaton_state->out) - 1;
- while (cursor >= 0) {
- transition_succ = (xbt_automaton_transition_t)xbt_dynar_get_as(current_pair->automaton_state->out, cursor, xbt_automaton_transition_t);
- res = MC_automaton_evaluate_label(transition_succ->label, prop_values.get());
- if (res == 1 || res == 2) { /* 1 = True transition (always enabled), 2 = enabled transition according to atomic prop values */
- next_pair = new Pair();
- next_pair->graph_state = MC_state_new();
- next_pair->automaton_state = transition_succ->dst;
- next_pair->atomic_propositions = get_atomic_propositions_values();
- next_pair->depth = current_pair->depth + 1;
- /* Get enabled processes and insert them in the interleave set of the next graph_state */
- for (auto& p : mc_model_checker->process().simix_processes())
- if (simgrid::mc::process_is_enabled(&p.copy))
- MC_state_interleave_process(next_pair->graph_state, &p.copy);
-
- next_pair->requests = MC_state_interleave_size(next_pair->graph_state);
-
- /* FIXME : get search_cycle value for each acceptant state */
- if (next_pair->automaton_state->type == 1 || current_pair->search_cycle)
- next_pair->search_cycle = 1;
-
- /* Add new pair to the exploration stack */
- xbt_fifo_unshift(mc_stack, next_pair);
-
- }
- cursor--;
- }
-
- } /* End of visited_pair test */
-
- } else {
-
- backtracking:
- if(visited_num == -1)
- XBT_DEBUG("No more request to execute. Looking for backtracking point.");
-
- prop_values.reset();
-
- /* Traverse the stack backwards until a pair with a non empty interleave
- set is found, deleting all the pairs that have it empty in the way. */
- while ((current_pair = (simgrid::mc::Pair*) xbt_fifo_shift(mc_stack)) != nullptr) {
- if (current_pair->requests > 0) {
- /* We found a backtracking point */
- XBT_DEBUG("Backtracking to depth %d", current_pair->depth);
- xbt_fifo_unshift(mc_stack, current_pair);
- MC_replay_liveness(mc_stack);
- XBT_DEBUG("Backtracking done");
- break;
- }else{
- /* Delete pair */
- XBT_DEBUG("Delete pair %d at depth %d", current_pair->num, current_pair->depth);
- if (current_pair->automaton_state->type == 1)
- remove_acceptance_pair(current_pair->num);
- delete current_pair;
- }
- }
-
- } /* End of if (current_pair->requests > 0) else ... */
-
- } /* End of while(xbt_fifo_size(mc_stack) > 0) */
-
- XBT_INFO("No property violation found.");
- MC_print_statistics(mc_stats);
- return SIMGRID_MC_EXIT_SUCCESS;
-}
-
-int modelcheck_liveness(void)
-{
- XBT_INFO("Check the liveness property %s", _sg_mc_property_file);
- MC_automaton_load(_sg_mc_property_file);
- mc_model_checker->wait_for_requests();
-
- XBT_DEBUG("Starting the liveness algorithm");
- _sg_mc_liveness = 1;
-
- /* Create exploration stack */
- mc_stack = xbt_fifo_new();
-
- /* Create the initial state */
- initial_global_state = xbt_new0(s_mc_global_t, 1);
-
- MC_pre_modelcheck_liveness();
- int res = MC_modelcheck_liveness_main();
-
- return res;
-}
-
-}
-}
