Logo AND Algorithmique Numérique Distribuée

Public GIT Repository
7a164f8b00d7e90e8db114ec1e94698afa821f8f
[simgrid.git] / src / mc / mc_state.cpp
1 /* Copyright (c) 2008-2015. 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 <assert.h>
8
9 #include <algorithm>
10
11 #include <xbt/log.h>
12 #include <xbt/sysdep.h>
13
14 #include "src/simix/smx_private.h"
15 #include "src/mc/mc_state.h"
16 #include "src/mc/mc_request.h"
17 #include "src/mc/mc_private.h"
18 #include "src/mc/mc_comm_pattern.h"
19 #include "src/mc/mc_smx.h"
20 #include "src/mc/mc_xbt.hpp"
21
22 using simgrid::mc::remote;
23
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_state, mc,
25                                 "Logging specific to MC (state)");
26
27 /**
28  * \brief Creates a state data structure used by the exploration algorithm
29  */
30 simgrid::mc::State* MC_state_new()
31 {
32   simgrid::mc::State* state = new simgrid::mc::State();
33   state->processStates.resize(MC_smx_get_maxpid());
34   state->num = ++mc_stats->expanded_states;
35   /* Stateful model checking */
36   if((_sg_mc_checkpoint > 0 && (mc_stats->expanded_states % _sg_mc_checkpoint == 0)) ||  _sg_mc_termination){
37     state->system_state = simgrid::mc::take_snapshot(state->num);
38     if(_sg_mc_comms_determinism || _sg_mc_send_determinism){
39       MC_state_copy_incomplete_communications_pattern(state);
40       MC_state_copy_index_communications_pattern(state);
41     }
42   }
43   return state;
44 }
45
46 namespace simgrid {
47 namespace mc {
48
49 State::State()
50 {
51   std::memset(&this->internal_comm, 0, sizeof(this->internal_comm));
52   std::memset(&this->internal_req, 0, sizeof(this->internal_req));
53   std::memset(&this->executed_req, 0, sizeof(this->executed_req));
54 }
55
56 std::size_t State::interleaveSize() const
57 {
58   return std::count_if(this->processStates.begin(), this->processStates.end(),
59     [](simgrid::mc::ProcessState const& state) { return state.isToInterleave(); });
60 }
61
62 RecordTraceElement State::getRecordElement() const
63 {
64   smx_process_t issuer = MC_smx_simcall_get_issuer(&this->executed_req);
65   return RecordTraceElement(issuer->pid, this->req_num);
66 }
67
68 }
69 }
70
71 smx_simcall_t MC_state_get_executed_request(simgrid::mc::State* state, int *value)
72 {
73   *value = state->req_num;
74   return &state->executed_req;
75 }
76
77 smx_simcall_t MC_state_get_internal_request(simgrid::mc::State* state)
78 {
79   return &state->internal_req;
80 }
81
82 static inline smx_simcall_t MC_state_get_request_for_process(
83   simgrid::mc::State* state, int*value, smx_process_t process)
84 {
85   simgrid::mc::ProcessState* procstate = &state->processStates[process->pid];
86
87   if (!procstate->isToInterleave())
88     return nullptr;
89   if (!simgrid::mc::process_is_enabled(process))
90     return nullptr;
91
92   smx_simcall_t req = nullptr;
93   switch (process->simcall.call) {
94       case SIMCALL_COMM_WAITANY:
95         *value = -1;
96         while (procstate->interleave_count <
97               read_length(mc_model_checker->process(),
98                 remote(simcall_comm_waitany__get__comms(&process->simcall)))) {
99           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
100               procstate->interleave_count++)) {
101             *value = procstate->interleave_count - 1;
102             break;
103           }
104         }
105
106         if (procstate->interleave_count >=
107             simgrid::mc::read_length(mc_model_checker->process(),
108               simgrid::mc::remote(simcall_comm_waitany__get__comms(&process->simcall))))
109           procstate->setDone();
110         if (*value != -1)
111           req = &process->simcall;
112         break;
113
114       case SIMCALL_COMM_TESTANY: {
115         unsigned start_count = procstate->interleave_count;
116         *value = -1;
117         while (procstate->interleave_count <
118                 read_length(mc_model_checker->process(),
119                   remote(simcall_comm_testany__get__comms(&process->simcall))))
120           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
121               procstate->interleave_count++)) {
122             *value = procstate->interleave_count - 1;
123             break;
124           }
125
126         if (procstate->interleave_count >=
127             read_length(mc_model_checker->process(),
128               remote(simcall_comm_testany__get__comms(&process->simcall))))
129           procstate->setDone();
130
131         if (*value != -1 || start_count == 0)
132            req = &process->simcall;
133
134         break;
135       }
136
137       case SIMCALL_COMM_WAIT: {
138         smx_synchro_t remote_act = simcall_comm_wait__get__comm(&process->simcall);
139         s_smx_synchro_t act;
140         mc_model_checker->process().read_bytes(
141           &act, sizeof(act), remote(remote_act));
142         if (act.comm.src_proc && act.comm.dst_proc)
143           *value = 0;
144         else if (act.comm.src_proc == nullptr && act.comm.type == SIMIX_COMM_READY
145               && act.comm.detached == 1)
146           *value = 0;
147         else
148           *value = -1;
149         procstate->setDone();
150         req = &process->simcall;
151         break;
152       }
153
154       case SIMCALL_MC_RANDOM: {
155         int min_value = simcall_mc_random__get__min(&process->simcall);
156         *value = procstate->interleave_count + min_value;
157         procstate->interleave_count++;
158         if (*value == simcall_mc_random__get__max(&process->simcall))
159           procstate->setDone();
160         req = &process->simcall;
161         break;
162       }
163
164       default:
165         procstate->setDone();
166         *value = 0;
167         req = &process->simcall;
168         break;
169   }
170   if (!req)
171     return nullptr;
172
173   // Fetch the data of the request and translate it:
174
175   state->executed_req = *req;
176   state->req_num = *value;
177
178   /* The waitany and testany request are transformed into a wait or test request
179    * over the corresponding communication action so it can be treated later by
180    * the dependence function. */
181   switch (req->call) {
182   case SIMCALL_COMM_WAITANY: {
183     state->internal_req.call = SIMCALL_COMM_WAIT;
184     state->internal_req.issuer = req->issuer;
185     smx_synchro_t remote_comm;
186     read_element(mc_model_checker->process(),
187       &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
188       *value, sizeof(remote_comm));
189     mc_model_checker->process().read(&state->internal_comm, remote(remote_comm));
190     simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
191     simcall_comm_wait__set__timeout(&state->internal_req, 0);
192     break;
193   }
194
195   case SIMCALL_COMM_TESTANY:
196     state->internal_req.call = SIMCALL_COMM_TEST;
197     state->internal_req.issuer = req->issuer;
198
199     if (*value > 0) {
200       smx_synchro_t remote_comm;
201       read_element(mc_model_checker->process(),
202         &remote_comm, remote(simcall_comm_testany__get__comms(req)),
203         *value, sizeof(remote_comm));
204       mc_model_checker->process().read(&state->internal_comm, remote(remote_comm));
205     }
206
207     simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
208     simcall_comm_test__set__result(&state->internal_req, *value);
209     break;
210
211   case SIMCALL_COMM_WAIT:
212     state->internal_req = *req;
213     mc_model_checker->process().read_bytes(&state->internal_comm ,
214       sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
215     simcall_comm_wait__set__comm(&state->executed_req, &state->internal_comm);
216     simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
217     break;
218
219   case SIMCALL_COMM_TEST:
220     state->internal_req = *req;
221     mc_model_checker->process().read_bytes(&state->internal_comm,
222       sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
223     simcall_comm_test__set__comm(&state->executed_req, &state->internal_comm);
224     simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
225     break;
226
227   default:
228     state->internal_req = *req;
229     break;
230   }
231
232   return req;
233 }
234
235 smx_simcall_t MC_state_get_request(simgrid::mc::State* state, int *value)
236 {
237   for (auto& p : mc_model_checker->process().simix_processes()) {
238     smx_simcall_t res = MC_state_get_request_for_process(state, value, &p.copy);
239     if (res)
240       return res;
241   }
242   return nullptr;
243 }