1 /* Copyright (c) 2011-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
14 #include <xbt/sysdep.h>
16 #include "src/mc/mc_comm_pattern.h"
17 #include "src/mc/mc_safety.h"
18 #include "src/mc/mc_private.h"
19 #include "src/mc/Process.hpp"
20 #include "src/mc/mc_smx.h"
21 #include "src/mc/VisitedState.hpp"
23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_VisitedState, mc,
24 "Logging specific to state equaity detection mechanisms");
29 static int snapshot_compare(simgrid::mc::VisitedState* state1, simgrid::mc::VisitedState* state2)
31 simgrid::mc::Snapshot* s1 = state1->system_state.get();
32 simgrid::mc::Snapshot* s2 = state2->system_state.get();
33 int num1 = state1->num;
34 int num2 = state2->num;
35 return snapshot_compare(num1, s1, num2, s2);
39 * \brief Save the current state
40 * \return Snapshot of the current state.
42 VisitedState::VisitedState()
44 simgrid::mc::Process* process = &(mc_model_checker->process());
45 this->heap_bytes_used = mmalloc_get_bytes_used_remote(
46 process->get_heap()->heaplimit,
47 process->get_malloc_info());
50 mc_model_checker->process().simix_processes().size();
52 this->system_state = simgrid::mc::take_snapshot(mc_stats->expanded_states);
53 this->num = mc_stats->expanded_states;
57 VisitedState::~VisitedState()
61 void VisitedStates::prune()
63 while (states_.size() > (std::size_t) _sg_mc_visited) {
64 XBT_DEBUG("Try to remove visited state (maximum number of stored states reached)");
65 auto min_element = std::min_element(states_.begin(), states_.end(),
66 [](std::unique_ptr<simgrid::mc::VisitedState>& a, std::unique_ptr<simgrid::mc::VisitedState>& b) {
67 return a->num < b->num;
69 xbt_assert(min_element != states_.end());
71 states_.erase(min_element);
72 XBT_DEBUG("Remove visited state (maximum number of stored states reached)");
77 * \brief Checks whether a given state has already been visited by the algorithm.
79 std::unique_ptr<simgrid::mc::VisitedState> VisitedStates::addVisitedState(simgrid::mc::State* graph_state, bool compare_snpashots)
81 std::unique_ptr<simgrid::mc::VisitedState> new_state =
82 std::unique_ptr<simgrid::mc::VisitedState>(new VisitedState());
83 graph_state->system_state = new_state->system_state;
84 XBT_DEBUG("Snapshot %p of visited state %d (exploration stack state %d)",
85 new_state->system_state.get(), new_state->num, graph_state->num);
87 auto range = std::equal_range(states_.begin(), states_.end(),
88 new_state.get(), simgrid::mc::DerefAndCompareByNbProcessesAndUsedHeap());
90 if (compare_snpashots)
91 for (auto i = range.first; i != range.second; ++i) {
92 auto& visited_state = *i;
93 if (snapshot_compare(visited_state.get(), new_state.get()) == 0) {
94 // The state has been visited:
96 std::unique_ptr<simgrid::mc::VisitedState> old_state =
97 std::move(visited_state);
99 if (old_state->other_num == -1)
100 new_state->other_num = old_state->num;
102 new_state->other_num = old_state->other_num;
104 if (dot_output == nullptr)
105 XBT_DEBUG("State %d already visited ! (equal to state %d)",
106 new_state->num, old_state->num);
109 "State %d already visited ! (equal to state %d (state %d in dot_output))",
110 new_state->num, old_state->num, new_state->other_num);
112 /* Replace the old state with the new one (with a bigger num)
113 (when the max number of visited states is reached, the oldest
114 one is removed according to its number (= with the min number) */
115 XBT_DEBUG("Replace visited state %d with the new visited state %d",
116 old_state->num, new_state->num);
118 visited_state = std::move(new_state);
119 return std::move(old_state);
123 XBT_DEBUG("Insert new visited state %d (total : %lu)", new_state->num, (unsigned long) states_.size());
124 states_.insert(range.first, std::move(new_state));