1 /* Copyright (c) 2011-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include <xbt/dynar.h>
11 #include <xbt/automaton.h>
13 #include "mc_request.h"
14 #include "mc_liveness.h"
15 #include "mc_private.h"
16 #include "mc_record.h"
18 #include "mc_client.h"
19 #include "mc_replay.h"
20 #include "mc_safety.h"
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_liveness, mc,
25 "Logging specific to algorithms for liveness properties verification");
27 /********* Global variables *********/
29 xbt_dynar_t acceptance_pairs;
32 /********* Static functions *********/
34 static xbt_dynar_t get_atomic_propositions_values()
36 unsigned int cursor = 0;
37 xbt_automaton_propositional_symbol_t ps = NULL;
38 xbt_dynar_t values = xbt_dynar_new(sizeof(int), NULL);
39 xbt_dynar_foreach(_mc_property_automaton->propositional_symbols, cursor, ps) {
40 int res = xbt_automaton_propositional_symbol_evaluate(ps);
41 xbt_dynar_push_as(values, int, res);
47 static mc_visited_pair_t is_reached_acceptance_pair(mc_pair_t pair)
49 mc_visited_pair_t new_pair = NULL;
50 new_pair = MC_visited_pair_new(pair->num, pair->automaton_state, pair->atomic_propositions, pair->graph_state);
51 new_pair->acceptance_pair = 1;
53 if (xbt_dynar_is_empty(acceptance_pairs)) {
55 xbt_dynar_push(acceptance_pairs, &new_pair);
59 int min = -1, max = -1, index;
61 mc_visited_pair_t pair_test;
64 index = get_search_interval(acceptance_pairs, new_pair, &min, &max);
66 if (min != -1 && max != -1) { // Acceptance pair with same number of processes and same heap bytes used exists
68 // Parallell implementation
69 /*res = xbt_parmap_mc_apply(parmap, snapshot_compare, xbt_dynar_get_ptr(acceptance_pairs, min), (max-min)+1, pair);
71 return ((mc_pair_t)xbt_dynar_get_as(acceptance_pairs, (min+res)-1, mc_pair_t))->num;
75 if(pair->search_cycle == 1){
76 while (cursor <= max) {
77 pair_test = (mc_visited_pair_t) xbt_dynar_get_as(acceptance_pairs, cursor, mc_visited_pair_t);
78 if (xbt_automaton_state_compare(pair_test->automaton_state, new_pair->automaton_state) == 0) {
79 if (xbt_automaton_propositional_symbols_compare_value(pair_test->atomic_propositions, new_pair->atomic_propositions) == 0) {
80 if (snapshot_compare(pair_test, new_pair) == 0) {
81 XBT_INFO("Pair %d already reached (equal to pair %d) !", new_pair->num, pair_test->num);
82 xbt_fifo_shift(mc_stack);
83 if (dot_output != NULL)
84 fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, pair_test->num, initial_global_state->prev_req);
92 xbt_dynar_insert_at(acceptance_pairs, min, &new_pair);
94 pair_test = (mc_visited_pair_t) xbt_dynar_get_as(acceptance_pairs, index, mc_visited_pair_t);
95 if (pair_test->nb_processes < new_pair->nb_processes) {
96 xbt_dynar_insert_at(acceptance_pairs, index + 1, &new_pair);
98 if (pair_test->heap_bytes_used < new_pair->heap_bytes_used)
99 xbt_dynar_insert_at(acceptance_pairs, index + 1, &new_pair);
101 xbt_dynar_insert_at(acceptance_pairs, index, &new_pair);
108 static void remove_acceptance_pair(int pair_num)
110 unsigned int cursor = 0;
111 mc_visited_pair_t pair_test = NULL;
114 xbt_dynar_foreach(acceptance_pairs, cursor, pair_test) {
115 if (pair_test->num == pair_num) {
121 if(pair_found == 1) {
122 xbt_dynar_remove_at(acceptance_pairs, cursor, &pair_test);
124 pair_test->acceptance_removed = 1;
126 if (_sg_mc_visited == 0 || pair_test->visited_removed == 1)
127 MC_visited_pair_delete(pair_test);
133 static int MC_automaton_evaluate_label(xbt_automaton_exp_label_t l,
134 xbt_dynar_t atomic_propositions_values)
139 int left_res = MC_automaton_evaluate_label(l->u.or_and.left_exp, atomic_propositions_values);
140 int right_res = MC_automaton_evaluate_label(l->u.or_and.right_exp, atomic_propositions_values);
141 return (left_res || right_res);
144 int left_res = MC_automaton_evaluate_label(l->u.or_and.left_exp, atomic_propositions_values);
145 int right_res = MC_automaton_evaluate_label(l->u.or_and.right_exp, atomic_propositions_values);
146 return (left_res && right_res);
149 int res = MC_automaton_evaluate_label(l->u.exp_not, atomic_propositions_values);
153 unsigned int cursor = 0;
154 xbt_automaton_propositional_symbol_t p = NULL;
155 xbt_dynar_foreach(_mc_property_automaton->propositional_symbols, cursor, p) {
156 if (strcmp(xbt_automaton_propositional_symbol_get_name(p), l->u.predicat) == 0)
157 return (int) xbt_dynar_get_as(atomic_propositions_values, cursor, int);
169 static void MC_modelcheck_liveness_main(void);
171 static void MC_pre_modelcheck_liveness(void)
173 mc_pair_t initial_pair = NULL;
174 smx_process_t process;
176 MC_wait_for_requests();
178 acceptance_pairs = xbt_dynar_new(sizeof(mc_visited_pair_t), NULL);
179 if(_sg_mc_visited > 0)
180 visited_pairs = xbt_dynar_new(sizeof(mc_visited_pair_t), NULL);
182 initial_global_state->snapshot = MC_take_snapshot(0);
183 initial_global_state->prev_pair = 0;
185 unsigned int cursor = 0;
186 xbt_automaton_state_t automaton_state;
188 xbt_dynar_foreach(_mc_property_automaton->states, cursor, automaton_state) {
189 if (automaton_state->type == -1) { /* Initial automaton state */
191 initial_pair = MC_pair_new();
192 initial_pair->automaton_state = automaton_state;
193 initial_pair->graph_state = MC_state_new();
194 initial_pair->atomic_propositions = get_atomic_propositions_values();
195 initial_pair->depth = 1;
197 /* Get enabled processes and insert them in the interleave set of the graph_state */
198 MC_EACH_SIMIX_PROCESS(process,
199 if (MC_process_is_enabled(process)) {
200 MC_state_interleave_process(initial_pair->graph_state, process);
204 initial_pair->requests = MC_state_interleave_size(initial_pair->graph_state);
205 initial_pair->search_cycle = 0;
207 xbt_fifo_unshift(mc_stack, initial_pair);
211 MC_modelcheck_liveness_main();
214 static void MC_modelcheck_liveness_main(void)
216 smx_process_t process = NULL;
217 mc_pair_t current_pair = NULL;
218 int value, res, visited_num = -1;
219 smx_simcall_t req = NULL;
220 xbt_automaton_transition_t transition_succ = NULL;
222 mc_pair_t next_pair = NULL;
223 xbt_dynar_t prop_values = NULL;
224 mc_visited_pair_t reached_pair = NULL;
226 while(xbt_fifo_size(mc_stack) > 0){
228 /* Get current pair */
229 current_pair = (mc_pair_t) xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack));
231 /* Update current state in buchi automaton */
232 _mc_property_automaton->current_state = current_pair->automaton_state;
234 XBT_DEBUG("********************* ( Depth = %d, search_cycle = %d, interleave size = %d, pair_num = %d, requests = %d)",
235 current_pair->depth, current_pair->search_cycle,
236 MC_state_interleave_size(current_pair->graph_state), current_pair->num,
237 current_pair->requests);
239 if (current_pair->requests > 0) {
241 if (current_pair->automaton_state->type == 1 && current_pair->exploration_started == 0) {
242 /* If new acceptance pair, return new pair */
243 if ((reached_pair = is_reached_acceptance_pair(current_pair)) == NULL) {
244 int counter_example_depth = current_pair->depth;
245 XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
246 XBT_INFO("| ACCEPTANCE CYCLE |");
247 XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
248 XBT_INFO("Counter-example that violates formula :");
249 MC_record_dump_path(mc_stack);
250 MC_show_stack_liveness(mc_stack);
251 MC_dump_stack_liveness(mc_stack);
252 MC_print_statistics(mc_stats);
253 XBT_INFO("Counter-example depth : %d", counter_example_depth);
258 /* Pair already visited ? stop the exploration on the current path */
259 if ((current_pair->exploration_started == 0) && (visited_num = is_visited_pair(reached_pair, current_pair)) != -1) {
261 if (dot_output != NULL){
262 fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, visited_num, initial_global_state->prev_req);
266 XBT_DEBUG("Pair already visited (equal to pair %d), exploration on the current path stopped.", visited_num);
267 current_pair->requests = 0;
272 req = MC_state_get_request(current_pair->graph_state, &value);
274 if (dot_output != NULL) {
275 if (initial_global_state->prev_pair != 0 && initial_global_state->prev_pair != current_pair->num) {
276 fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", initial_global_state->prev_pair, current_pair->num, initial_global_state->prev_req);
277 xbt_free(initial_global_state->prev_req);
279 initial_global_state->prev_pair = current_pair->num;
280 initial_global_state->prev_req = MC_request_get_dot_output(req, value);
281 if (current_pair->search_cycle)
282 fprintf(dot_output, "%d [shape=doublecircle];\n", current_pair->num);
286 char* req_str = MC_request_to_string(req, value, MC_REQUEST_SIMIX);
287 XBT_DEBUG("Execute: %s", req_str);
290 /* Set request as executed */
291 MC_state_set_executed_request(current_pair->graph_state, req, value);
293 /* Update mc_stats */
294 mc_stats->executed_transitions++;
295 if(current_pair->exploration_started == 0)
296 mc_stats->visited_pairs++;
298 /* Answer the request */
299 MC_simcall_handle(req, value);
301 /* Wait for requests (schedules processes) */
302 MC_wait_for_requests();
304 current_pair->requests--;
305 current_pair->exploration_started = 1;
307 /* Get values of atomic propositions (variables used in the property formula) */
308 prop_values = get_atomic_propositions_values();
310 /* Evaluate enabled/true transitions in automaton according to atomic propositions values and create new pairs */
311 cursor = xbt_dynar_length(current_pair->automaton_state->out) - 1;
312 while (cursor >= 0) {
313 transition_succ = (xbt_automaton_transition_t)xbt_dynar_get_as(current_pair->automaton_state->out, cursor, xbt_automaton_transition_t);
314 res = MC_automaton_evaluate_label(transition_succ->label, prop_values);
315 if (res == 1 || res == 2) { /* 1 = True transition (always enabled), 2 = enabled transition according to atomic prop values */
316 next_pair = MC_pair_new();
317 next_pair->graph_state = MC_state_new();
318 next_pair->automaton_state = transition_succ->dst;
319 next_pair->atomic_propositions = get_atomic_propositions_values();
320 next_pair->depth = current_pair->depth + 1;
321 /* Get enabled processes and insert them in the interleave set of the next graph_state */
322 MC_EACH_SIMIX_PROCESS(process,
323 if (MC_process_is_enabled(process)) {
324 MC_state_interleave_process(next_pair->graph_state, process);
328 next_pair->requests = MC_state_interleave_size(next_pair->graph_state);
330 /* FIXME : get search_cycle value for each acceptant state */
331 if (next_pair->automaton_state->type == 1 || current_pair->search_cycle)
332 next_pair->search_cycle = 1;
334 /* Add new pair to the exploration stack */
335 xbt_fifo_unshift(mc_stack, next_pair);
341 } /* End of visited_pair test */
346 if(visited_num == -1)
347 XBT_DEBUG("No more request to execute. Looking for backtracking point.");
349 xbt_dynar_free(&prop_values);
351 /* Traverse the stack backwards until a pair with a non empty interleave
352 set is found, deleting all the pairs that have it empty in the way. */
353 while ((current_pair = (mc_pair_t) xbt_fifo_shift(mc_stack)) != NULL) {
354 if (current_pair->requests > 0) {
355 /* We found a backtracking point */
356 XBT_DEBUG("Backtracking to depth %d", current_pair->depth);
357 xbt_fifo_unshift(mc_stack, current_pair);
358 MC_replay_liveness(mc_stack);
359 XBT_DEBUG("Backtracking done");
363 XBT_DEBUG("Delete pair %d at depth %d", current_pair->num, current_pair->depth);
364 if (current_pair->automaton_state->type == 1)
365 remove_acceptance_pair(current_pair->num);
366 MC_pair_delete(current_pair);
370 } /* End of if (current_pair->requests > 0) else ... */
372 } /* End of while(xbt_fifo_size(mc_stack) > 0) */
376 void MC_modelcheck_liveness(void)
378 if (mc_reduce_kind == e_mc_reduce_unset)
379 mc_reduce_kind = e_mc_reduce_none;
380 XBT_INFO("Check the liveness property %s", _sg_mc_property_file);
381 MC_automaton_load(_sg_mc_property_file);
382 MC_wait_for_requests();
384 XBT_DEBUG("Starting the liveness algorithm");
387 /* Create exploration stack */
388 mc_stack = xbt_fifo_new();
390 /* Create the initial state */
391 initial_global_state = xbt_new0(s_mc_global_t, 1);
393 MC_pre_modelcheck_liveness();
396 XBT_INFO("No property violation found.");
397 MC_print_statistics(mc_stats);