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;
22 * \brief Initialize the model-checker data structures
26 /* Check if MC is already initialized */
30 /* Initialize the data structures that must be persistent across every
31 iteration of the model-checker (in RAW memory) */
34 /* Initialize statistics */
35 mc_stats = xbt_new0(s_mc_stats_t, 1);
36 mc_stats->state_size = 1;
38 /* Create exploration stack */
39 mc_stack = xbt_fifo_new();
46 /* Save the initial state */
47 initial_snapshot = xbt_new0(s_mc_snapshot_t, 1);
48 MC_take_snapshot(initial_snapshot);
52 void MC_modelcheck(void)
64 int MC_random(int min, int max)
66 /*FIXME: return mc_current_state->executed_transition->random.value;*/
71 * \brief Schedules all the process that are ready to run
73 void MC_wait_for_requests(void)
79 SIMIX_context_runall(simix_global->process_to_run);
80 while((req = SIMIX_request_pop())){
81 if(!SIMIX_request_is_visible(req))
82 SIMIX_request_pre(req);
83 else if(req->call == REQ_COMM_WAITANY)
85 else if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
86 req_str = MC_request_to_string(req);
87 DEBUG1("Got: %s", req_str);
91 } while (xbt_dynar_length(simix_global->process_to_run));
94 int MC_deadlock_check()
97 smx_process_t process;
98 if(xbt_swag_size(simix_global->process_list)){
100 xbt_swag_foreach(process, simix_global->process_list){
101 if(process->request.call != REQ_NO_REQ
102 && SIMIX_request_is_enabled(&process->request)){
112 * \brief Re-executes from the initial state all the transitions indicated by
113 * a given model-checker stack.
114 * \param stack The stack with the transitions to execute.
116 void MC_replay(xbt_fifo_t stack)
119 smx_req_t req = NULL, saved_req = NULL;
120 xbt_fifo_item_t item;
123 DEBUG0("**** Begin Replay ****");
125 /* Restore the initial state */
126 MC_restore_snapshot(initial_snapshot);
127 /* At the moment of taking the snapshot the raw heap was set, so restoring
128 * it will set it back again, we have to unset it to continue */
131 /* Traverse the stack from the initial state and re-execute the transitions */
132 for (item = xbt_fifo_get_last_item(stack);
133 item != xbt_fifo_get_first_item(stack);
134 item = xbt_fifo_get_prev_item(item)) {
136 state = (mc_state_t) xbt_fifo_get_item_content(item);
137 saved_req = MC_state_get_executed_request(state);
140 /* because we got a copy of the executed request, we have to fetch the
141 real one, pointed by the request field of the issuer process */
142 req = &saved_req->issuer->request;
144 /* Debug information */
145 if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
146 req_str = MC_request_to_string(req);
147 DEBUG2("Replay: %s (%p)", req_str, state);
152 SIMIX_request_pre(req);
153 MC_wait_for_requests();
155 /* Update statistics */
156 mc_stats->visited_states++;
157 mc_stats->executed_transitions++;
159 DEBUG0("**** End Replay ****");
163 * \brief Dumps the contents of a model-checker's stack and shows the actual
165 * \param stack The stack to dump
167 void MC_dump_stack(xbt_fifo_t stack)
171 MC_show_stack(stack);
174 while ((state = (mc_state_t) xbt_fifo_pop(stack)) != NULL)
175 MC_state_delete(state);
179 void MC_show_stack(xbt_fifo_t stack)
182 xbt_fifo_item_t item;
184 char *req_str = NULL;
186 for (item = xbt_fifo_get_last_item(stack);
187 (item ? (state = (mc_state_t) (xbt_fifo_get_item_content(item)))
188 : (NULL)); item = xbt_fifo_get_prev_item(item)) {
189 req = MC_state_get_executed_request(state);
191 req_str = MC_request_to_string(req);
192 INFO1("%s", req_str);
198 void MC_show_deadlock(smx_req_t req)
200 char *req_str = NULL;
201 INFO0("**************************");
202 INFO0("*** DEAD-LOCK DETECTED ***");
203 INFO0("**************************");
204 INFO0("Locked request:");
205 req_str = MC_request_to_string(req);
206 INFO1("%s", req_str);
208 INFO0("Counter-example execution trace:");
209 MC_dump_stack(mc_stack);
212 void MC_print_statistics(mc_stats_t stats)
214 INFO1("State space size ~= %lu", stats->state_size);
215 INFO1("Expanded states = %lu", stats->expanded_states);
216 INFO1("Visited states = %lu", stats->visited_states);
217 INFO1("Executed transitions = %lu", stats->executed_transitions);
218 INFO1("Expanded / Visited = %lf",
219 (double) stats->visited_states / stats->expanded_states);
220 /*INFO1("Exploration coverage = %lf",
221 (double)stats->expanded_states / stats->state_size); */
224 void MC_assert(int prop)
226 if (MC_IS_ENABLED && !prop) {
227 INFO0("**************************");
228 INFO0("*** PROPERTY NOT VALID ***");
229 INFO0("**************************");
230 INFO0("Counter-example execution trace:");
231 MC_dump_stack(mc_stack);
232 MC_print_statistics(mc_stats);