1 /* Copyright (c) 2008-2023. 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. */
6 #include "src/mc/api/State.hpp"
7 #include "src/mc/api/guide/BasicGuide.hpp"
8 #include "src/mc/api/guide/WaitGuide.hpp"
9 #include "src/mc/explo/Exploration.hpp"
10 #include "src/mc/mc_config.hpp"
12 #include <boost/range/algorithm.hpp>
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_state, mc, "Logging specific to MC states");
16 namespace simgrid::mc {
18 long State::expended_states_ = 0;
20 State::State(const State& other)
21 : transition_(other.transition_)
23 , system_state_(other.system_state_)
24 , parent_state_(nullptr)
25 , guide_(other.guide_)
26 , sleep_set_(other.sleep_set_)
30 State::State(RemoteApp& remote_app) : num_(++expended_states_)
32 XBT_VERB("Creating a guide for the state");
33 if (_sg_mc_guided == "none")
34 guide_ = std::make_shared<BasicGuide>();
35 if (_sg_mc_guided == "nb_wait")
36 guide_ = std::make_shared<WaitGuide>();
38 remote_app.get_actors_status(guide_->actors_to_run_);
40 /* Stateful model checking */
41 if ((_sg_mc_checkpoint > 0 && (num_ % _sg_mc_checkpoint == 0)) || _sg_mc_termination)
42 system_state_ = std::make_shared<simgrid::mc::Snapshot>(num_, remote_app.get_page_store(),
43 *remote_app.get_remote_process_memory());
46 State::State(RemoteApp& remote_app, const State* parent_state) : num_(++expended_states_), parent_state_(parent_state)
49 if (_sg_mc_guided == "none")
50 guide_ = std::make_shared<BasicGuide>();
51 if (_sg_mc_guided == "nb_wait")
52 guide_ = std::make_shared<WaitGuide>();
53 *guide_ = *(parent_state->guide_);
55 remote_app.get_actors_status(guide_->actors_to_run_);
57 /* Stateful model checking */
58 if ((_sg_mc_checkpoint > 0 && (num_ % _sg_mc_checkpoint == 0)) || _sg_mc_termination)
59 system_state_ = std::make_shared<simgrid::mc::Snapshot>(num_, remote_app.get_page_store(),
60 *remote_app.get_remote_process_memory());
62 /* If we want sleep set reduction, copy the sleep set and eventually removes things from it */
63 if (_sg_mc_sleep_set) {
64 /* For each actor in the previous sleep set, keep it if it is not dependent with current transition.
65 * And if we kept it and the actor is enabled in this state, mark the actor as already done, so that
66 * it is not explored*/
67 for (auto& [aid, transition] : parent_state_->get_sleep_set()) {
69 if (not parent_state_->get_transition()->depends(&transition)) {
71 sleep_set_.try_emplace(aid, transition);
72 if (guide_->actors_to_run_.count(aid) != 0) {
73 XBT_DEBUG("Actor %ld will not be explored, for it is in the sleep set", aid);
75 guide_->actors_to_run_.at(aid).mark_done();
78 XBT_DEBUG("Transition >>%s<< removed from the sleep set because it was dependent with >>%s<<",
79 transition.to_string().c_str(), parent_state_->get_transition()->to_string().c_str());
84 std::size_t State::count_todo() const
86 return boost::range::count_if(this->guide_->actors_to_run_, [](auto& pair) { return pair.second.is_todo(); });
89 Transition* State::get_transition() const
94 aid_t State::next_transition() const
96 XBT_DEBUG("Search for an actor to run. %zu actors to consider", guide_->actors_to_run_.size());
97 for (auto const& [aid, actor] : guide_->actors_to_run_) {
98 /* Only consider actors (1) marked as interleaving by the checker and (2) currently enabled in the application */
99 if (not actor.is_todo() || not actor.is_enabled() || actor.is_done()) {
101 if (not actor.is_todo())
102 XBT_DEBUG("Can't run actor %ld because it is not todo", aid);
104 if (not actor.is_enabled())
105 XBT_DEBUG("Can't run actor %ld because it is not enabled", aid);
108 XBT_DEBUG("Can't run actor %ld because it has already been done", aid);
118 std::pair<aid_t, double> State::next_transition_guided() const
120 return guide_->next_transition();
123 // This should be done in GuidedState, or at least interact with it
124 void State::execute_next(aid_t next, RemoteApp& app)
126 // First, warn the guide, so it knows how to build a proper child state
127 guide_->execute_next(next, app);
129 // This actor is ready to be executed. Execution involves three phases:
131 // 1. Identify the appropriate ActorState to prepare for execution
132 // when simcall_handle will be called on it
133 auto& actor_state = guide_->actors_to_run_.at(next);
134 const unsigned times_considered = actor_state.do_consider();
135 const auto* expected_executed_transition = actor_state.get_transition(times_considered);
136 xbt_assert(expected_executed_transition != nullptr,
137 "Expected a transition with %u times considered to be noted in actor %ld", times_considered, next);
139 XBT_DEBUG("Let's run actor %ld (times_considered = %u)", next, times_considered);
141 // 2. Execute the actor according to the preparation above
142 Transition::executed_transitions_++;
143 auto* just_executed = app.handle_simcall(next, times_considered, true);
144 xbt_assert(just_executed->type_ == expected_executed_transition->type_,
145 "The transition that was just executed by actor %ld, viz:\n"
147 "is not what was purportedly scheduled to execute, which was:\n"
149 next, just_executed->to_string().c_str(), expected_executed_transition->to_string().c_str());
151 // 3. Update the state with the newest information. This means recording
153 // 1. what action was last taken from this state (viz. `executed_transition`)
154 // 2. what action actor `next` was able to take given `times_considered`
155 // The latter update is important as *more* information is potentially available
156 // about a transition AFTER it has executed.
157 transition_ = just_executed;
159 auto executed_transition = std::unique_ptr<Transition>(just_executed);
160 actor_state.set_transition(std::move(executed_transition), times_considered);
162 app.wait_for_requests();
164 } // namespace simgrid::mc