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model-checker : parallel system state comparison for safety MC
[simgrid.git] / src / mc / mc_state.c
1 /* Copyright (c) 2008-2013. The SimGrid Team.
2  * All rights reserved.                                                     */
3
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. */
6
7 #include "../simix/smx_private.h"
8 #include "xbt/fifo.h"
9 #include "mc_private.h"
10
11 /**
12  * \brief Creates a state data structure used by the exploration algorithm
13  */
14 mc_state_t MC_state_new()
15 {
16   mc_state_t state = NULL;
17   
18   state = xbt_new0(s_mc_state_t, 1);
19   state->max_pid = simix_process_maxpid;
20   state->proc_status = xbt_new0(s_mc_procstate_t, state->max_pid);
21   state->system_state = NULL;
22   state->num = ++mc_stats->expanded_states;
23   
24   return state;
25 }
26
27 /**
28  * \brief Deletes a state data structure
29  * \param trans The state to be deleted
30  */
31 void MC_state_delete(mc_state_t state)
32 {
33   if(state->system_state)
34     MC_free_snapshot(state->system_state);
35   xbt_free(state->proc_status);
36   xbt_free(state);
37 }
38
39 void MC_state_interleave_process(mc_state_t state, smx_process_t process)
40 {
41   state->proc_status[process->pid].state = MC_INTERLEAVE;
42   state->proc_status[process->pid].interleave_count = 0;
43 }
44
45 void MC_state_remove_interleave_process(mc_state_t state, smx_process_t process)
46 {
47   if(state->proc_status[process->pid].state == MC_INTERLEAVE)
48     state->proc_status[process->pid].state = MC_DONE;
49 }
50
51 unsigned int MC_state_interleave_size(mc_state_t state)
52 {
53   unsigned int i, size=0;
54
55   for(i=0; i < state->max_pid; i++){
56     if((state->proc_status[i].state == MC_INTERLEAVE) || (state->proc_status[i].state == MC_MORE_INTERLEAVE))
57       size++;
58   }
59
60   return size;
61 }
62
63 int MC_state_process_is_done(mc_state_t state, smx_process_t process){
64   return state->proc_status[process->pid].state == MC_DONE ? TRUE : FALSE;
65 }
66
67 void MC_state_set_executed_request(mc_state_t state, smx_simcall_t req, int value)
68 {
69   state->executed_req = *req;
70   state->req_num = value;
71   smx_process_t process = NULL;
72   mc_procstate_t procstate = NULL;
73
74   /* The waitany and testany request are transformed into a wait or test request over the
75    * corresponding communication action so it can be treated later by the dependence
76    * function. */
77   switch(req->call){
78     case SIMCALL_COMM_WAITANY:
79       state->internal_req.call = SIMCALL_COMM_WAIT;
80       state->internal_req.issuer = req->issuer;
81       state->internal_comm = *xbt_dynar_get_as(simcall_comm_waitany__get__comms(req), value, smx_action_t);
82       simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
83       simcall_comm_wait__set__timeout(&state->internal_req, 0);
84       break;
85
86     case SIMCALL_COMM_TESTANY:
87       state->internal_req.call = SIMCALL_COMM_TEST;
88       state->internal_req.issuer = req->issuer;
89
90       if(value > 0)
91         state->internal_comm = *xbt_dynar_get_as(simcall_comm_testany__get__comms(req), value, smx_action_t);
92
93       simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
94       simcall_comm_test__set__result(&state->internal_req, value);
95       break;
96
97     case SIMCALL_COMM_WAIT:
98       state->internal_req = *req;
99       state->internal_comm = *(simcall_comm_wait__get__comm(req));
100       simcall_comm_wait__set__comm(&state->executed_req, &state->internal_comm);
101       simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
102       break;
103
104     case SIMCALL_COMM_TEST:
105       state->internal_req = *req;
106       state->internal_comm = *simcall_comm_test__get__comm(req);
107       simcall_comm_test__set__comm(&state->executed_req, &state->internal_comm);
108       simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
109       break;
110
111     case SIMCALL_MC_RANDOM:
112       state->internal_req = *req;
113       if(value != simcall_mc_random__get__max(req)){
114         xbt_swag_foreach(process, simix_global->process_list){
115           procstate = &state->proc_status[process->pid];
116           if(process->pid == req->issuer->pid){
117             procstate->state = MC_MORE_INTERLEAVE;
118             break;
119           }        
120         }
121       }
122       break;
123
124     default:
125       state->internal_req = *req;
126       break;
127   }
128 }
129  
130 smx_simcall_t MC_state_get_executed_request(mc_state_t state, int *value)
131 {
132   *value = state->req_num;
133   return &state->executed_req;
134 }
135
136 smx_simcall_t MC_state_get_internal_request(mc_state_t state)
137 {
138   return &state->internal_req;
139 }
140
141 smx_simcall_t MC_state_get_request(mc_state_t state, int *value)
142 {
143   smx_process_t process = NULL;
144   mc_procstate_t procstate = NULL;
145   unsigned int start_count;
146
147   xbt_swag_foreach(process, simix_global->process_list){
148     procstate = &state->proc_status[process->pid];
149
150     if(procstate->state == MC_INTERLEAVE || procstate->state == MC_MORE_INTERLEAVE){
151       if(MC_process_is_enabled(process)){
152         switch(process->simcall.call){
153           case SIMCALL_COMM_WAITANY:
154             *value = -1;
155             while(procstate->interleave_count < xbt_dynar_length(simcall_comm_waitany__get__comms(&process->simcall))){
156               if(MC_request_is_enabled_by_idx(&process->simcall, procstate->interleave_count++)){
157                 *value = procstate->interleave_count-1;
158                 break;
159               }
160             }
161
162             if(procstate->interleave_count >= xbt_dynar_length(simcall_comm_waitany__get__comms(&process->simcall)))
163               procstate->state = MC_DONE;
164
165             if(*value != -1)
166               return &process->simcall;
167
168             break;
169
170           case SIMCALL_COMM_TESTANY:
171             start_count = procstate->interleave_count;
172             *value = -1;
173             while(procstate->interleave_count < xbt_dynar_length(simcall_comm_testany__get__comms(&process->simcall))){
174               if(MC_request_is_enabled_by_idx(&process->simcall, procstate->interleave_count++)){
175                 *value = procstate->interleave_count - 1;
176                 break;
177               }
178             }
179
180             if(procstate->interleave_count >= xbt_dynar_length(simcall_comm_testany__get__comms(&process->simcall)))
181               procstate->state = MC_DONE;
182
183             if(*value != -1 || start_count == 0)
184               return &process->simcall;
185
186             break;
187
188           case SIMCALL_COMM_WAIT:
189             if(simcall_comm_wait__get__comm(&process->simcall)->comm.src_proc
190                && simcall_comm_wait__get__comm(&process->simcall)->comm.dst_proc){
191               *value = 0;
192             }else{
193               *value = -1;
194             }
195             procstate->state = MC_DONE;
196             return &process->simcall;
197
198             break;
199
200           case SIMCALL_MC_RANDOM:
201             if(procstate->state == MC_INTERLEAVE)
202               *value = 0;
203             else{
204               if(state->req_num < simcall_mc_random__get__max(&process->simcall))
205                 *value = state->req_num + 1;
206             }
207             procstate->state = MC_DONE;
208             return &process->simcall;
209             break;
210           
211           default:
212             procstate->state = MC_DONE;
213             *value = 0;
214             return &process->simcall;
215             break;
216         }
217       }
218     }
219   }
220
221   return NULL;
222 }