1 /* Copyright (c) 2008-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include <boost/range/algorithm.hpp>
11 #include <xbt/sysdep.h>
13 #include "src/simix/smx_private.h"
14 #include "src/mc/mc_state.h"
15 #include "src/mc/mc_request.h"
16 #include "src/mc/mc_private.h"
17 #include "src/mc/mc_comm_pattern.h"
18 #include "src/mc/mc_smx.h"
19 #include "src/mc/mc_xbt.hpp"
20 #include "src/mc/Transition.hpp"
22 using simgrid::mc::remote;
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_state, mc, "Logging specific to MC (state)");
29 State::State(unsigned long state_number)
31 this->internal_comm.clear();
32 std::memset(&this->internal_req, 0, sizeof(this->internal_req));
33 std::memset(&this->executed_req, 0, sizeof(this->executed_req));
35 processStates.resize(MC_smx_get_maxpid());
37 /* Stateful model checking */
38 if ((_sg_mc_checkpoint > 0 && (state_number % _sg_mc_checkpoint == 0)) || _sg_mc_termination) {
39 system_state = simgrid::mc::take_snapshot(num);
40 if (_sg_mc_comms_determinism || _sg_mc_send_determinism) {
41 MC_state_copy_incomplete_communications_pattern(this);
42 MC_state_copy_index_communications_pattern(this);
47 std::size_t State::interleaveSize() const
49 return boost::range::count_if(this->processStates,
50 [](simgrid::mc::ProcessState const& p) { return p.isToInterleave(); });
53 Transition State::getTransition() const
55 return this->transition;
61 /* Search an enabled transition for the given process.
63 * This can be seen as an iterator returning the next transition of the process.
65 * We only consider the processes that are both
66 * - marked "to be interleaved" in their ProcessState (controled by the checker algo).
67 * - which simcall can currently be executed (like a comm where the other partner is already known)
68 * Once we returned the last enabled transition of a process, it is marked done.
70 * Things can get muddled with the WAITANY and TESTANY simcalls, that are rewritten
71 * on the fly to a bunch of WAIT (resp TEST) transitions using the transition.argument
72 * field to remember what was the last returned sub-transition.
74 static inline smx_simcall_t MC_state_get_request_for_process(
75 simgrid::mc::State* state, smx_actor_t process)
77 /* reset the outgoing transition */
78 simgrid::mc::ProcessState* procstate = &state->processStates[process->pid];
79 state->transition.pid = -1;
80 state->transition.argument = -1;
81 state->executed_req.call = SIMCALL_NONE;
83 if (!procstate->isToInterleave())
85 if (!simgrid::mc::actor_is_enabled(process))
88 smx_simcall_t req = nullptr;
89 switch (process->simcall.call) {
90 case SIMCALL_COMM_WAITANY:
91 state->transition.argument = -1;
92 while (procstate->interleave_count <
93 read_length(mc_model_checker->process(),
94 remote(simcall_comm_waitany__get__comms(&process->simcall)))) {
95 if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
96 procstate->interleave_count++)) {
97 state->transition.argument = procstate->interleave_count - 1;
102 if (procstate->interleave_count >=
103 simgrid::mc::read_length(mc_model_checker->process(),
104 simgrid::mc::remote(simcall_comm_waitany__get__comms(&process->simcall))))
105 procstate->setDone();
106 if (state->transition.argument != -1)
107 req = &process->simcall;
110 case SIMCALL_COMM_TESTANY: {
111 unsigned start_count = procstate->interleave_count;
112 state->transition.argument = -1;
113 while (procstate->interleave_count <
114 simcall_comm_testany__get__count(&process->simcall))
115 if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
116 procstate->interleave_count++)) {
117 state->transition.argument = procstate->interleave_count - 1;
121 if (procstate->interleave_count >=
122 simcall_comm_testany__get__count(&process->simcall))
123 procstate->setDone();
125 if (state->transition.argument != -1 || start_count == 0)
126 req = &process->simcall;
131 case SIMCALL_COMM_WAIT: {
132 simgrid::mc::RemotePtr<simgrid::kernel::activity::Comm> remote_act = remote(
133 static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(&process->simcall)));
134 simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_act;
135 mc_model_checker->process().read(temp_act, remote_act);
136 simgrid::kernel::activity::Comm* act = temp_act.getBuffer();
137 if (act->src_proc && act->dst_proc)
138 state->transition.argument = 0;
139 else if (act->src_proc == nullptr && act->type == SIMIX_COMM_READY
140 && act->detached == 1)
141 state->transition.argument = 0;
143 state->transition.argument = -1;
144 procstate->setDone();
145 req = &process->simcall;
149 case SIMCALL_MC_RANDOM: {
150 int min_value = simcall_mc_random__get__min(&process->simcall);
151 state->transition.argument = procstate->interleave_count + min_value;
152 procstate->interleave_count++;
153 if (state->transition.argument == simcall_mc_random__get__max(&process->simcall))
154 procstate->setDone();
155 req = &process->simcall;
160 procstate->setDone();
161 state->transition.argument = 0;
162 req = &process->simcall;
168 // Fetch the data of the request and translate it:
170 state->transition.pid = process->pid;
172 state->executed_req = *req;
174 /* The waitany and testany request are transformed into a wait or test request
175 * over the corresponding communication action so it can be treated later by
176 * the dependence function. */
178 case SIMCALL_COMM_WAITANY: {
179 state->internal_req.call = SIMCALL_COMM_WAIT;
180 state->internal_req.issuer = req->issuer;
181 smx_activity_t remote_comm;
182 read_element(mc_model_checker->process(),
183 &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
184 state->transition.argument, sizeof(remote_comm));
185 mc_model_checker->process().read(state->internal_comm, remote(
186 static_cast<simgrid::kernel::activity::Comm*>(remote_comm)));
187 simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
188 simcall_comm_wait__set__timeout(&state->internal_req, 0);
192 case SIMCALL_COMM_TESTANY:
193 state->internal_req.call = SIMCALL_COMM_TEST;
194 state->internal_req.issuer = req->issuer;
196 if (state->transition.argument > 0) {
197 smx_activity_t remote_comm = mc_model_checker->process().read(
198 remote(simcall_comm_testany__get__comms(req) + state->transition.argument));
199 mc_model_checker->process().read(state->internal_comm, remote(
200 static_cast<simgrid::kernel::activity::Comm*>(remote_comm)));
203 simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
204 simcall_comm_test__set__result(&state->internal_req, state->transition.argument);
207 case SIMCALL_COMM_WAIT:
208 state->internal_req = *req;
209 mc_model_checker->process().read_bytes(&state->internal_comm ,
210 sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
211 simcall_comm_wait__set__comm(&state->executed_req, state->internal_comm.getBuffer());
212 simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
215 case SIMCALL_COMM_TEST:
216 state->internal_req = *req;
217 mc_model_checker->process().read_bytes(&state->internal_comm,
218 sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
219 simcall_comm_test__set__comm(&state->executed_req, state->internal_comm.getBuffer());
220 simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
224 state->internal_req = *req;
231 smx_simcall_t MC_state_get_request(simgrid::mc::State* state)
233 for (auto& actor : mc_model_checker->process().actors()) {
234 smx_simcall_t res = MC_state_get_request_for_process(state, actor.copy.getBuffer());