5 #include "../surf/surf_private.h"
6 #include "../simix/private.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_global, mc,
12 "Logging specific to MC (global)");
14 /* MC global data structures */
15 mc_snapshot_t initial_snapshot = NULL;
16 xbt_fifo_t mc_stack = NULL;
17 mc_stats_t mc_stats = NULL;
18 mc_state_t mc_current_state = NULL;
19 char mc_replay_mode = FALSE;
20 double *mc_time = NULL;
22 * \brief Initialize the model-checker data structures
26 /* Check if MC is already initialized */
30 mc_time = xbt_new0(double, simix_process_maxpid);
32 /* Initialize the data structures that must be persistent across every
33 iteration of the model-checker (in RAW memory) */
36 /* Initialize statistics */
37 mc_stats = xbt_new0(s_mc_stats_t, 1);
38 mc_stats->state_size = 1;
40 /* Create exploration stack */
41 mc_stack = xbt_fifo_new();
48 /* Save the initial state */
49 initial_snapshot = xbt_new0(s_mc_snapshot_t, 1);
50 MC_take_snapshot(initial_snapshot);
54 void MC_modelcheck(void)
67 int MC_random(int min, int max)
69 /*FIXME: return mc_current_state->executed_transition->random.value;*/
74 * \brief Schedules all the process that are ready to run
76 void MC_wait_for_requests(void)
82 SIMIX_context_runall(simix_global->process_to_run);
83 while((req = SIMIX_request_pop())){
84 if(!MC_request_is_visible(req))
85 SIMIX_request_pre(req, 0);
86 else if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
87 req_str = MC_request_to_string(req);
88 DEBUG1("Got: %s", req_str);
92 } while (xbt_dynar_length(simix_global->process_to_run));
95 int MC_deadlock_check()
98 smx_process_t process;
99 if(xbt_swag_size(simix_global->process_list)){
101 xbt_swag_foreach(process, simix_global->process_list){
102 if(process->request.call != REQ_NO_REQ
103 && MC_request_is_enabled(&process->request)){
113 * \brief Re-executes from the initial state all the transitions indicated by
114 * a given model-checker stack.
115 * \param stack The stack with the transitions to execute.
117 void MC_replay(xbt_fifo_t stack)
121 smx_req_t req = NULL, saved_req = NULL;
122 xbt_fifo_item_t item;
125 DEBUG0("**** Begin Replay ****");
127 /* Restore the initial state */
128 MC_restore_snapshot(initial_snapshot);
129 /* At the moment of taking the snapshot the raw heap was set, so restoring
130 * it will set it back again, we have to unset it to continue */
133 /* Traverse the stack from the initial state and re-execute the transitions */
134 for (item = xbt_fifo_get_last_item(stack);
135 item != xbt_fifo_get_first_item(stack);
136 item = xbt_fifo_get_prev_item(item)) {
138 state = (mc_state_t) xbt_fifo_get_item_content(item);
139 saved_req = MC_state_get_executed_request(state, &value);
142 /* because we got a copy of the executed request, we have to fetch the
143 real one, pointed by the request field of the issuer process */
144 req = &saved_req->issuer->request;
146 /* Debug information */
147 if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
148 req_str = MC_request_to_string(req);
149 DEBUG2("Replay: %s (%p)", req_str, state);
154 SIMIX_request_pre(req, value);
155 MC_wait_for_requests();
157 /* Update statistics */
158 mc_stats->visited_states++;
159 mc_stats->executed_transitions++;
161 DEBUG0("**** End Replay ****");
165 * \brief Dumps the contents of a model-checker's stack and shows the actual
167 * \param stack The stack to dump
169 void MC_dump_stack(xbt_fifo_t stack)
173 MC_show_stack(stack);
176 while ((state = (mc_state_t) xbt_fifo_pop(stack)) != NULL)
177 MC_state_delete(state);
181 void MC_show_stack(xbt_fifo_t stack)
185 xbt_fifo_item_t item;
187 char *req_str = NULL;
189 for (item = xbt_fifo_get_last_item(stack);
190 (item ? (state = (mc_state_t) (xbt_fifo_get_item_content(item)))
191 : (NULL)); item = xbt_fifo_get_prev_item(item)) {
192 req = MC_state_get_executed_request(state, &value);
194 req_str = MC_request_to_string(req);
195 INFO1("%s", req_str);
201 void MC_show_deadlock(smx_req_t req)
203 /*char *req_str = NULL;*/
204 INFO0("**************************");
205 INFO0("*** DEAD-LOCK DETECTED ***");
206 INFO0("**************************");
207 INFO0("Locked request:");
208 /*req_str = MC_request_to_string(req);
209 INFO1("%s", req_str);
211 INFO0("Counter-example execution trace:");
212 MC_dump_stack(mc_stack);
215 void MC_print_statistics(mc_stats_t stats)
217 INFO1("State space size ~= %lu", stats->state_size);
218 INFO1("Expanded states = %lu", stats->expanded_states);
219 INFO1("Visited states = %lu", stats->visited_states);
220 INFO1("Executed transitions = %lu", stats->executed_transitions);
221 INFO1("Expanded / Visited = %lf",
222 (double) stats->visited_states / stats->expanded_states);
223 /*INFO1("Exploration coverage = %lf",
224 (double)stats->expanded_states / stats->state_size); */
227 void MC_assert(int prop)
229 if (MC_IS_ENABLED && !prop) {
230 INFO0("**************************");
231 INFO0("*** PROPERTY NOT VALID ***");
232 INFO0("**************************");
233 INFO0("Counter-example execution trace:");
234 MC_dump_stack(mc_stack);
235 MC_print_statistics(mc_stats);
240 void MC_process_clock_add(smx_process_t process, double amount)
242 mc_time[process->pid] += amount;
245 double MC_process_clock_get(smx_process_t process)
248 return mc_time[process->pid];