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 actorStates.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->actorStates,
50 [](simgrid::mc::ProcessState const& p) { return p.isTodo(); });
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 (controlled by the checker algorithm).
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 actor)
77 /* reset the outgoing transition */
78 simgrid::mc::ProcessState* procstate = &state->actorStates[actor->pid];
79 state->transition.pid = -1;
80 state->transition.argument = -1;
81 state->executed_req.call = SIMCALL_NONE;
83 if (!procstate->isTodo())
84 return nullptr; // Not considered by the checker algorithm
85 if (!simgrid::mc::actor_is_enabled(actor))
86 return nullptr; // Not executable in the application
88 smx_simcall_t req = nullptr;
89 switch (actor->simcall.call) {
90 case SIMCALL_COMM_WAITANY:
91 state->transition.argument = -1;
92 while (procstate->times_considered <
93 read_length(mc_model_checker->process(),
94 remote(simcall_comm_waitany__get__comms(&actor->simcall)))) {
95 if (simgrid::mc::request_is_enabled_by_idx(&actor->simcall,
96 procstate->times_considered++)) {
97 state->transition.argument = procstate->times_considered - 1;
102 if (procstate->times_considered >=
103 simgrid::mc::read_length(mc_model_checker->process(),
104 simgrid::mc::remote(simcall_comm_waitany__get__comms(&actor->simcall))))
105 procstate->setDone();
106 if (state->transition.argument != -1)
107 req = &actor->simcall;
110 case SIMCALL_COMM_TESTANY: {
111 unsigned start_count = procstate->times_considered;
112 state->transition.argument = -1;
113 while (procstate->times_considered <
114 simcall_comm_testany__get__count(&actor->simcall))
115 if (simgrid::mc::request_is_enabled_by_idx(&actor->simcall,
116 procstate->times_considered++)) {
117 state->transition.argument = procstate->times_considered - 1;
121 if (procstate->times_considered >=
122 simcall_comm_testany__get__count(&actor->simcall))
123 procstate->setDone();
125 if (state->transition.argument != -1 || start_count == 0)
126 req = &actor->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(&actor->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 = &actor->simcall;
149 case SIMCALL_MC_RANDOM: {
150 int min_value = simcall_mc_random__get__min(&actor->simcall);
151 state->transition.argument = procstate->times_considered + min_value;
152 procstate->times_considered++;
153 if (state->transition.argument == simcall_mc_random__get__max(&actor->simcall))
154 procstate->setDone();
155 req = &actor->simcall;
160 procstate->setDone();
161 state->transition.argument = 0;
162 req = &actor->simcall;
168 state->transition.pid = actor->pid;
169 state->executed_req = *req;
170 // Fetch the data of the request and translate it:
171 state->internal_req = *req;
173 /* The waitany and testany request are transformed into a wait or test request
174 * over the corresponding communication action so it can be treated later by
175 * the dependence function. */
177 case SIMCALL_COMM_WAITANY: {
178 state->internal_req.call = SIMCALL_COMM_WAIT;
179 smx_activity_t remote_comm;
180 read_element(mc_model_checker->process(),
181 &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
182 state->transition.argument, sizeof(remote_comm));
183 mc_model_checker->process().read(state->internal_comm, remote(
184 static_cast<simgrid::kernel::activity::Comm*>(remote_comm)));
185 simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
186 simcall_comm_wait__set__timeout(&state->internal_req, 0);
190 case SIMCALL_COMM_TESTANY:
191 state->internal_req.call = SIMCALL_COMM_TEST;
193 if (state->transition.argument > 0) {
194 smx_activity_t remote_comm = mc_model_checker->process().read(
195 remote(simcall_comm_testany__get__comms(req) + state->transition.argument));
196 mc_model_checker->process().read(state->internal_comm, remote(
197 static_cast<simgrid::kernel::activity::Comm*>(remote_comm)));
200 simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
201 simcall_comm_test__set__result(&state->internal_req, state->transition.argument);
204 case SIMCALL_COMM_WAIT:
205 mc_model_checker->process().read_bytes(&state->internal_comm ,
206 sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
207 simcall_comm_wait__set__comm(&state->executed_req, state->internal_comm.getBuffer());
208 simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
211 case SIMCALL_COMM_TEST:
212 mc_model_checker->process().read_bytes(&state->internal_comm,
213 sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
214 simcall_comm_test__set__comm(&state->executed_req, state->internal_comm.getBuffer());
215 simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
219 /* No translation needed */
226 smx_simcall_t MC_state_get_request(simgrid::mc::State* state)
228 for (auto& actor : mc_model_checker->process().actors()) {
229 smx_simcall_t res = MC_state_get_request_for_process(state, actor.copy.getBuffer());