1 #include "../surf/surf_private.h"
2 #include "../simix/private.h"
6 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_global, mc,
7 "Logging specific to MC (global)");
9 /* MC global data structures */
10 mc_snapshot_t initial_snapshot = NULL;
11 xbt_fifo_t mc_stack = NULL;
12 xbt_setset_t mc_setset = NULL;
13 mc_stats_t mc_stats = NULL;
14 mc_state_t mc_current_state = NULL;
15 char mc_replay_mode = FALSE;
18 * \brief Initialize the model-checker data structures
20 void MC_init(int method)
22 /* Check if MC is already initialized */
26 /* Initialize the data structures that must be persistent across every
27 iteration of the model-checker (in RAW memory) */
30 /* Initialize statistics */
31 mc_stats = xbt_new0(s_mc_stats_t, 1);
32 mc_stats->state_size = 1;
34 /* Create exploration stack */
35 mc_stack = xbt_fifo_new();
37 /* Create the container for the sets */
38 mc_setset = xbt_setset_new(20);
51 /* Save the initial state */
53 initial_snapshot = xbt_new(s_mc_snapshot_t, 1);
54 MC_take_snapshot(initial_snapshot);
58 void MC_modelcheck(int method)
77 void MC_exit(int method)
92 /* Destroy MC data structures (in RAW memory) */
96 while ((state = (mc_state_t) xbt_fifo_pop(mc_stack)) != NULL)
97 MC_state_delete(state);
99 xbt_fifo_free(mc_stack);
100 xbt_setset_destroy(mc_setset);
104 int MC_random(int min, int max)
106 MC_trans_intercept_random(min, max);
107 return mc_current_state->executed_transition->random.value;
111 * \brief Re-executes from the initial state all the transitions indicated by
112 * a given model-checker stack.
113 * \param stack The stack with the transitions to execute.
115 void MC_replay(xbt_fifo_t stack)
117 xbt_fifo_item_t item;
118 mc_transition_t trans;
120 DEBUG0("**** Begin Replay ****");
122 /* Restore the initial state */
123 MC_restore_snapshot(initial_snapshot);
125 mc_replay_mode = TRUE;
129 /* Traverse the stack from the initial state and re-execute the transitions */
130 for (item = xbt_fifo_get_last_item(stack);
131 item != xbt_fifo_get_first_item(stack);
132 item = xbt_fifo_get_prev_item(item)) {
134 mc_current_state = (mc_state_t) xbt_fifo_get_item_content(item);
135 trans = mc_current_state->executed_transition;
137 /* Update statistics */
138 mc_stats->visited_states++;
139 mc_stats->executed_transitions++;
141 DEBUG1("Executing transition %s", trans->name);
142 SIMIX_process_schedule(trans->process);
144 /* Do all surf's related black magic tricks to keep all working */
145 MC_execute_surf_actions();
147 /* Schedule every process that got enabled due to the executed transition */
148 MC_schedule_enabled_processes();
150 mc_replay_mode = FALSE;
151 DEBUG0("**** End Replay ****");
155 * \brief Dumps the contents of a model-checker's stack and shows the actual
157 * \param stack The stack to dump
159 void MC_dump_stack(xbt_fifo_t stack)
163 MC_show_stack(stack);
166 while ((state = (mc_state_t) xbt_fifo_pop(stack)) != NULL)
167 MC_state_delete(state);
171 void MC_show_stack(xbt_fifo_t stack)
174 mc_transition_t trans;
175 xbt_fifo_item_t item;
177 for (item = xbt_fifo_get_last_item(stack);
178 (item ? (state = (mc_state_t) (xbt_fifo_get_item_content(item)))
179 : (NULL)); item = xbt_fifo_get_prev_item(item)) {
180 trans = state->executed_transition;
182 INFO1("%s", trans->name);
188 * \brief Schedules all the process that are ready to run
189 * As a side effect it performs some clean-up required by SIMIX
191 void MC_schedule_enabled_processes(void)
193 smx_process_t process;
195 //SIMIX_process_empty_trash();
197 /* Schedule every process that is ready to run due to an finished action */
198 while ((process = xbt_swag_extract(simix_global->process_to_run))) {
199 DEBUG2("Scheduling %s on %s", process->name, process->smx_host->name);
200 SIMIX_process_schedule(process);
204 /******************************** States **************************************/
207 * \brief Creates a state data structure used by the exploration algorithm
209 mc_state_t MC_state_new(void)
211 mc_state_t state = NULL;
213 state = xbt_new0(s_mc_state_t, 1);
214 state->created_transitions = xbt_setset_new_set(mc_setset);
215 state->transitions = xbt_setset_new_set(mc_setset);
216 state->enabled_transitions = xbt_setset_new_set(mc_setset);
217 state->interleave = xbt_setset_new_set(mc_setset);
218 state->done = xbt_setset_new_set(mc_setset);
219 state->executed_transition = NULL;
221 mc_stats->expanded_states++;
227 * \brief Deletes a state data structure
228 * \param trans The state to be deleted
230 void MC_state_delete(mc_state_t state)
232 xbt_setset_cursor_t cursor;
233 mc_transition_t trans;
235 xbt_setset_foreach(state->created_transitions, cursor, trans) {
236 xbt_setset_elm_remove(mc_setset, trans);
237 MC_transition_delete(trans);
240 xbt_setset_destroy_set(state->created_transitions);
241 xbt_setset_destroy_set(state->transitions);
242 xbt_setset_destroy_set(state->enabled_transitions);
243 xbt_setset_destroy_set(state->interleave);
244 xbt_setset_destroy_set(state->done);
249 /************************** SURF Emulation ************************************/
251 /* Dirty hack, we manipulate surf's clock to simplify the integration of the
256 * \brief Executes all the actions at every model
258 void MC_execute_surf_actions(void)
261 surf_action_t action = NULL;
262 surf_model_t model = NULL;
263 smx_action_t smx_action = NULL;
265 /* Execute all the actions in every model */
266 xbt_dynar_foreach(model_list, iter, model) {
267 while ((action = xbt_swag_extract(model->states.running_action_set))) {
268 /* FIXME: timeouts are not calculated correctly */
269 if (NOW >= action->max_duration) {
270 surf_action_state_set(action, SURF_ACTION_DONE);
271 smx_action = action->data;
273 ("Resource [%s] (%d): Executing RUNNING action \"%s\" (%p) MaxDuration %lf",
274 model->name, xbt_swag_size(model->states.running_action_set),
275 smx_action->name, smx_action, action->max_duration);
278 SIMIX_action_signal_all(smx_action);
281 /*FIXME: check if this is always empty or not */
282 while ((action = xbt_swag_extract(model->states.failed_action_set))) {
283 smx_action = action->data;
284 DEBUG4("Resource [%s] (%d): Executing FAILED action \"%s\" (%p)",
285 model->name, xbt_swag_size(model->states.running_action_set),
286 smx_action->name, smx_action);
288 SIMIX_action_signal_all(smx_action);
291 /* That's it, now go one step deeper into the model-checking process! */
292 NOW += 0.5; /* FIXME: Check time increases */
295 /****************************** Statistics ************************************/
296 void MC_print_statistics(mc_stats_t stats)
298 INFO1("State space size ~= %lu", stats->state_size);
299 INFO1("Expanded states = %lu", stats->expanded_states);
300 INFO1("Visited states = %lu", stats->visited_states);
301 INFO1("Executed transitions = %lu", stats->executed_transitions);
302 INFO1("Expanded / Visited = %lf",
303 (double) stats->visited_states / stats->expanded_states);
304 /*INFO1("Exploration coverage = %lf",
305 (double)stats->expanded_states / stats->state_size); */
308 /************************* Assertion Checking *********************************/
309 void MC_assert(int prop)
312 INFO0("**************************");
313 INFO0("*** PROPERTY NOT VALID ***");
314 INFO0("**************************");
315 INFO0("Counter-example execution trace:");
316 MC_dump_stack(mc_stack);
317 MC_print_statistics(mc_stats);