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(!MC_request_is_visible(req))
82 SIMIX_request_pre(req, 0);
83 else if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
84 req_str = MC_request_to_string(req);
85 DEBUG1("Got: %s", req_str);
89 } while (xbt_dynar_length(simix_global->process_to_run));
92 int MC_deadlock_check()
95 smx_process_t process;
96 if(xbt_swag_size(simix_global->process_list)){
98 xbt_swag_foreach(process, simix_global->process_list){
99 if(process->request.call != REQ_NO_REQ
100 && MC_request_is_enabled(&process->request)){
110 * \brief Re-executes from the initial state all the transitions indicated by
111 * a given model-checker stack.
112 * \param stack The stack with the transitions to execute.
114 void MC_replay(xbt_fifo_t stack)
118 smx_req_t req = NULL, saved_req = NULL;
119 xbt_fifo_item_t item;
122 DEBUG0("**** Begin Replay ****");
124 /* Restore the initial state */
125 MC_restore_snapshot(initial_snapshot);
126 /* At the moment of taking the snapshot the raw heap was set, so restoring
127 * it will set it back again, we have to unset it to continue */
130 /* Traverse the stack from the initial state and re-execute the transitions */
131 for (item = xbt_fifo_get_last_item(stack);
132 item != xbt_fifo_get_first_item(stack);
133 item = xbt_fifo_get_prev_item(item)) {
135 state = (mc_state_t) xbt_fifo_get_item_content(item);
136 saved_req = MC_state_get_executed_request(state, &value);
139 /* because we got a copy of the executed request, we have to fetch the
140 real one, pointed by the request field of the issuer process */
141 req = &saved_req->issuer->request;
143 /* Debug information */
144 if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
145 req_str = MC_request_to_string(req);
146 DEBUG2("Replay: %s (%p)", req_str, state);
151 SIMIX_request_pre(req, value);
152 MC_wait_for_requests();
154 /* Update statistics */
155 mc_stats->visited_states++;
156 mc_stats->executed_transitions++;
158 DEBUG0("**** End Replay ****");
162 * \brief Dumps the contents of a model-checker's stack and shows the actual
164 * \param stack The stack to dump
166 void MC_dump_stack(xbt_fifo_t stack)
170 MC_show_stack(stack);
173 while ((state = (mc_state_t) xbt_fifo_pop(stack)) != NULL)
174 MC_state_delete(state);
178 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, &value);
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);