X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3b12e64243918b9f086546bb55cadb11c1ec7ef4..ebadbf7894190d4c66238842db5f8931adb7df5b:/src/mc/checker/SafetyChecker.cpp diff --git a/src/mc/checker/SafetyChecker.cpp b/src/mc/checker/SafetyChecker.cpp deleted file mode 100644 index c79f3842f5..0000000000 --- a/src/mc/checker/SafetyChecker.cpp +++ /dev/null @@ -1,297 +0,0 @@ -/* Copyright (c) 2016-2022. The SimGrid Team. All rights reserved. */ - -/* This program is free software; you can redistribute it and/or modify it - * under the terms of the license (GNU LGPL) which comes with this package. */ - -#include "src/mc/checker/SafetyChecker.hpp" -#include "src/mc/Session.hpp" -#include "src/mc/VisitedState.hpp" -#include "src/mc/api/Transition.hpp" -#include "src/mc/mc_config.hpp" -#include "src/mc/mc_exit.hpp" -#include "src/mc/mc_private.hpp" -#include "src/mc/mc_record.hpp" - -#include "src/xbt/mmalloc/mmprivate.h" -#include "xbt/log.h" -#include "xbt/sysdep.h" - -#include -#include - -#include -#include -#include - -using api = simgrid::mc::Api; - -XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_safety, mc, "Logging specific to MC safety verification "); - -namespace simgrid { -namespace mc { - -void SafetyChecker::check_non_termination(const State* current_state) -{ - for (auto state = stack_.rbegin(); state != stack_.rend(); ++state) - if (api::get().snapshot_equal((*state)->system_state_.get(), current_state->system_state_.get())) { - XBT_INFO("Non-progressive cycle: state %ld -> state %ld", (*state)->num_, current_state->num_); - XBT_INFO("******************************************"); - XBT_INFO("*** NON-PROGRESSIVE CYCLE DETECTED ***"); - XBT_INFO("******************************************"); - XBT_INFO("Counter-example execution trace:"); - for (auto const& s : get_textual_trace()) - XBT_INFO(" %s", s.c_str()); - XBT_INFO("Path = %s", get_record_trace().to_string().c_str()); - api::get().log_state(); - - throw TerminationError(); - } -} - -RecordTrace SafetyChecker::get_record_trace() // override -{ - RecordTrace res; - for (auto const& state : stack_) - res.push_back(state->get_transition()); - return res; -} - -std::vector SafetyChecker::get_textual_trace() // override -{ - std::vector trace; - for (auto const& state : stack_) - trace.push_back(state->get_transition()->to_string()); - return trace; -} - -void SafetyChecker::log_state() // override -{ - XBT_INFO("%ld unique states visited; %ld backtracks (%ld transition replays, %ld states visited overall)", - State::get_expanded_states(), backtrack_count_, api::get().mc_get_visited_states(), - Transition::get_replayed_transitions()); -} - -void SafetyChecker::run() -{ - /* This function runs the DFS algorithm the state space. - * We do so iteratively instead of recursively, dealing with the call stack manually. - * This allows one to explore the call stack at will. */ - - while (not stack_.empty()) { - /* Get current state */ - State* state = stack_.back().get(); - - XBT_DEBUG("**************************************************"); - XBT_VERB("Exploration depth=%zu (state=%p, num %ld)(%zu interleave)", stack_.size(), state, state->num_, - state->count_todo()); - - api::get().mc_inc_visited_states(); - - // Backtrack if we reached the maximum depth - if (stack_.size() > (std::size_t)_sg_mc_max_depth) { - if (reductionMode_ == ReductionMode::dpor) { - XBT_ERROR("/!\\ Max depth of %d reached! THIS WILL PROBABLY BREAK the dpor reduction /!\\", - _sg_mc_max_depth.get()); - XBT_ERROR("/!\\ If bad things happen, disable dpor with --cfg=model-check/reduction:none /!\\"); - } else - XBT_WARN("/!\\ Max depth reached ! /!\\ "); - this->backtrack(); - continue; - } - - // Backtrack if we are revisiting a state we saw previously - if (visited_state_ != nullptr) { - XBT_DEBUG("State already visited (equal to state %ld), exploration stopped on this path.", - visited_state_->original_num == -1 ? visited_state_->num : visited_state_->original_num); - - visited_state_ = nullptr; - this->backtrack(); - continue; - } - - // Search for the next transition - int next = state->next_transition(); - - if (next < 0) { // If there is no more transition in the current state, backtrack. - - XBT_DEBUG("There remains %zu actors, but none to interleave (depth %zu).", - mc_model_checker->get_remote_process().actors().size(), stack_.size() + 1); - - if (mc_model_checker->get_remote_process().actors().empty()) - mc_model_checker->finalize_app(); - this->backtrack(); - continue; - } - - /* Actually answer the request: let execute the selected request (MCed does one step) */ - state->execute_next(next); - - // If there are processes to interleave and the maximum depth has not been - // reached then perform one step of the exploration algorithm. - XBT_DEBUG("Execute: %s", state->get_transition()->to_string().c_str()); - - std::string req_str; - if (dot_output != nullptr) - req_str = api::get().request_get_dot_output(state->get_transition()); - - /* Create the new expanded state (copy the state of MCed into our MCer data) */ - auto next_state = std::make_unique(); - - if (_sg_mc_termination) - this->check_non_termination(next_state.get()); - - /* Check whether we already explored next_state in the past (but only if interested in state-equality reduction) */ - if (_sg_mc_max_visited_states > 0) - visited_state_ = visited_states_.addVisitedState(next_state->num_, next_state.get(), true); - - /* If this is a new state (or if we don't care about state-equality reduction) */ - if (visited_state_ == nullptr) { - /* Get an enabled process and insert it in the interleave set of the next state */ - auto actors = api::get().get_actors(); - for (auto& remoteActor : actors) { - auto actor = remoteActor.copy.get_buffer(); - if (get_session().actor_is_enabled(actor->get_pid())) { - next_state->mark_todo(actor->get_pid()); - if (reductionMode_ == ReductionMode::dpor) - break; // With DPOR, we take the first enabled transition - } - } - - if (dot_output != nullptr) - std::fprintf(dot_output, "\"%ld\" -> \"%ld\" [%s];\n", state->num_, next_state->num_, req_str.c_str()); - - } else if (dot_output != nullptr) - std::fprintf(dot_output, "\"%ld\" -> \"%ld\" [%s];\n", state->num_, - visited_state_->original_num == -1 ? visited_state_->num : visited_state_->original_num, - req_str.c_str()); - - stack_.push_back(std::move(next_state)); - } - - XBT_INFO("No property violation found."); - api::get().log_state(); -} - -void SafetyChecker::backtrack() -{ - backtrack_count_++; - stack_.pop_back(); - - api::get().mc_check_deadlock(); - - /* Traverse the stack backwards until a state with a non empty interleave set is found, deleting all the states that - * have it empty in the way. For each deleted state, check if the request that has generated it (from its - * predecessor state), depends on any other previous request executed before it. If it does then add it to the - * interleave set of the state that executed that previous request. */ - - while (not stack_.empty()) { - std::unique_ptr state = std::move(stack_.back()); - stack_.pop_back(); - if (reductionMode_ == ReductionMode::dpor) { - aid_t issuer_id = state->get_transition()->aid_; - for (auto i = stack_.rbegin(); i != stack_.rend(); ++i) { - State* prev_state = i->get(); - if (state->get_transition()->aid_ == prev_state->get_transition()->aid_) { - XBT_DEBUG("Simcall >>%s<< and >>%s<< with same issuer %ld", state->get_transition()->to_string().c_str(), - prev_state->get_transition()->to_string().c_str(), issuer_id); - break; - } else if (prev_state->get_transition()->depends(state->get_transition())) { - XBT_VERB("Dependent Transitions:"); - XBT_VERB(" %s (state=%ld)", prev_state->get_transition()->to_string().c_str(), prev_state->num_); - XBT_VERB(" %s (state=%ld)", state->get_transition()->to_string().c_str(), state->num_); - - if (not prev_state->actor_states_[issuer_id].is_done()) - prev_state->mark_todo(issuer_id); - else - XBT_DEBUG("Actor %ld is in done set", issuer_id); - break; - } else { - XBT_VERB("INDEPENDENT Transitions:"); - XBT_VERB(" %s (state=%ld)", prev_state->get_transition()->to_string().c_str(), prev_state->num_); - XBT_VERB(" %s (state=%ld)", state->get_transition()->to_string().c_str(), state->num_); - } - } - } - - if (state->count_todo() && stack_.size() < (std::size_t)_sg_mc_max_depth) { - /* We found a back-tracking point, let's loop */ - XBT_DEBUG("Back-tracking to state %ld at depth %zu", state->num_, stack_.size() + 1); - stack_.push_back(std::move(state)); - this->restore_state(); - XBT_DEBUG("Back-tracking to state %ld at depth %zu done", stack_.back()->num_, stack_.size()); - break; - } else { - XBT_DEBUG("Delete state %ld at depth %zu", state->num_, stack_.size() + 1); - } - } -} - -void SafetyChecker::restore_state() -{ - /* Intermediate backtracking */ - const State* last_state = stack_.back().get(); - if (last_state->system_state_) { - api::get().restore_state(last_state->system_state_); - return; - } - - get_session().restore_initial_state(); - - /* Traverse the stack from the state at position start and re-execute the transitions */ - for (std::unique_ptr const& state : stack_) { - if (state == stack_.back()) - break; - state->get_transition()->replay(); - /* Update statistics */ - api::get().mc_inc_visited_states(); - } -} - -SafetyChecker::SafetyChecker(Session* session) : Checker(session) -{ - reductionMode_ = reduction_mode; - if (_sg_mc_termination) - reductionMode_ = ReductionMode::none; - else if (reductionMode_ == ReductionMode::unset) - reductionMode_ = ReductionMode::dpor; - - if (_sg_mc_termination) - XBT_INFO("Check non progressive cycles"); - else - XBT_INFO("Check a safety property. Reduction is: %s.", - (reductionMode_ == ReductionMode::none ? "none" - : (reductionMode_ == ReductionMode::dpor ? "dpor" : "unknown"))); - - get_session().take_initial_snapshot(); - - XBT_DEBUG("Starting the safety algorithm"); - - auto initial_state = std::make_unique(); - - XBT_DEBUG("**************************************************"); - - /* Get an enabled actor and insert it in the interleave set of the initial state */ - auto actors = api::get().get_actors(); - XBT_DEBUG("Initial state. %zu actors to consider", actors.size()); - for (auto& actor : actors) { - aid_t aid = actor.copy.get_buffer()->get_pid(); - if (get_session().actor_is_enabled(aid)) { - initial_state->mark_todo(aid); - if (reductionMode_ == ReductionMode::dpor) { - XBT_DEBUG("Actor %ld is TODO, DPOR is ON so let's go for this one.", aid); - break; - } - XBT_DEBUG("Actor %ld is TODO", aid); - } - } - - stack_.push_back(std::move(initial_state)); -} - -Checker* create_safety_checker(Session* session) -{ - return new SafetyChecker(session); -} - -} // namespace mc -} // namespace simgrid