+++ /dev/null
-/* Copyright (c) 2011-2023. 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/VisitedState.hpp"
-#include "src/mc/explo/Exploration.hpp"
-#include "src/mc/mc_config.hpp"
-#include "src/mc/mc_private.hpp"
-
-#include <unistd.h>
-#include <sys/wait.h>
-#include <memory>
-#include <boost/range/algorithm.hpp>
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_VisitedState, mc, "Logging specific to state equality detection mechanisms");
-
-namespace simgrid::mc {
-
-/** @brief Save the current state */
-VisitedState::VisitedState(unsigned long state_number, unsigned int actor_count, RemoteApp& remote_app)
- : heap_bytes_used_(remote_app.get_remote_process_memory().get_remote_heap_bytes())
- , actor_count_(actor_count)
- , num_(state_number)
-{
- this->system_state_ = std::make_shared<simgrid::mc::Snapshot>(state_number, remote_app.get_page_store());
-}
-
-void VisitedStates::prune()
-{
- while (states_.size() > (std::size_t)_sg_mc_max_visited_states) {
- XBT_DEBUG("Try to remove visited state (maximum number of stored states reached)");
- auto min_element = boost::range::min_element(
- states_, [](const std::unique_ptr<simgrid::mc::VisitedState>& a,
- const std::unique_ptr<simgrid::mc::VisitedState>& b) { return a->num_ < b->num_; });
- xbt_assert(min_element != states_.end());
- // and drop it:
- states_.erase(min_element);
- XBT_DEBUG("Remove visited state (maximum number of stored states reached)");
- }
-}
-
-/** @brief Checks whether a given state has already been visited by the algorithm. */
-std::unique_ptr<simgrid::mc::VisitedState>
-VisitedStates::addVisitedState(unsigned long state_number, simgrid::mc::State* graph_state, RemoteApp& remote_app)
-{
- auto new_state =
- std::make_unique<simgrid::mc::VisitedState>(state_number, graph_state->get_actor_count(), remote_app);
-
- graph_state->set_system_state(new_state->system_state_);
- XBT_DEBUG("Snapshot %p of visited state %ld (exploration stack state %ld)", new_state->system_state_.get(),
- new_state->num_, graph_state->get_num());
-
- auto [range_begin, range_end] = boost::range::equal_range(states_, new_state.get(), [](auto const& a, auto const& b) {
- return std::make_pair(a->actor_count_, a->heap_bytes_used_) < std::make_pair(b->actor_count_, b->heap_bytes_used_);
- });
-
- for (auto i = range_begin; i != range_end; ++i) {
- auto& visited_state = *i;
- if (*visited_state->system_state_.get() == *new_state->system_state_.get()) {
- // The state has been visited:
-
- std::unique_ptr<simgrid::mc::VisitedState> old_state = std::move(visited_state);
-
- if (old_state->original_num_ == -1) // I'm the copy of an original process
- new_state->original_num_ = old_state->num_;
- else // I'm the copy of a copy
- new_state->original_num_ = old_state->original_num_;
-
- XBT_DEBUG("State %ld already visited ! (equal to state %ld (state %ld in dot_output))", new_state->num_,
- old_state->num_, new_state->original_num_);
-
- /* Replace the old state with the new one (with a bigger num)
- (when the max number of visited states is reached, the oldest
- one is removed according to its number (= with the min number) */
- XBT_DEBUG("Replace visited state %ld with the new visited state %ld", old_state->num_, new_state->num_);
-
- visited_state = std::move(new_state);
- return old_state;
- }
- }
-
- XBT_DEBUG("Insert new visited state %ld (total : %lu)", new_state->num_, (unsigned long)states_.size());
- states_.insert(range_begin, std::move(new_state));
- this->prune();
- return nullptr;
-}
-
-} // namespace simgrid::mc
